43 files changed, 8499 insertions, 5310 deletions

diff --git a/.gitignore b/.gitignore
index dc8af33..92beb11 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,6 @@ node_modules
 sassdoc
 .sassdoc
 test/**/*.css
-yarn-error.log
\ No newline at end of file
+yarn-error.log
+
+.idea
\ No newline at end of file
diff --git a/.stylelintrc.json b/.stylelintrc.json
index 8a9a924..fa2128b 100644
--- a/.stylelintrc.json
+++ b/.stylelintrc.json
@@ -1,23 +1,16 @@
 {
     "extends": "stylelint-config-sass-guidelines",
     "rules": {
-        "indentation": 4,
-        "number-leading-zero": "never",
-        "max-nesting-depth": 10,
+        "@stylistic/indentation": "tab",
+        "@stylistic/number-leading-zero": "never",
+        "@stylistic/declaration-colon-space-after": null,
+        "max-nesting-depth": 9,
         "selector-class-pattern": [
             "^[closut](-[a-z0-9]+)+(__[a-z0-9]+(-[a-z0-9]+)*)*(--[a-z0-9]+(-[a-z0-9]+)*)*(\\@[a-z0-9]+(-[a-z0-9]+)*)?$",
-            { "resolveNestedSelectors": true }
+            {
+                "resolveNestedSelectors": true
+            }
         ],
-        "declaration-colon-space-after": null,
-        "function-parentheses-newline-inside": "always-multi-line",
-        "function-parentheses-space-inside": "never-single-line",
-        "scss/dollar-variable-colon-space-after": null,
-        "scss/dollar-variable-pattern": "[a-z0-9-]+"
-    },
-    "overrides": [
-        {
-            "files": ["src/**/*.scss"],
-            "customSyntax": "postcss-scss"
-        }
-    ]
+        "scss/dollar-variable-colon-space-after": null
+    }
 }
diff --git a/package.json b/package.json
index a03255f..810a15f 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,9 @@
         "author": "Volpeon <me@volpeon.ink>",
         "license": "MIT",
         "description": "A mixin-based Sass framework that makes it easier to work with BEM, organize variables and more.",
-        "main": "src/index.scss",
-        "style": "src/index.scss",
-        "sass": "src/index.scss",
+        "main": "src/_iro-sass.scss",
+        "style": "src/_iro-sass.scss",
+        "sass": "src/_iro-sass.scss",
         "keywords": [
                 "sass",
                 "scss",
@@ -24,19 +24,19 @@
         },
         "homepage": "https://git.vulpes.one/iro-sass/",
         "devDependencies": {
-                "mocha": "^9.2.0",
-                "nodemon": "^2.0.15",
+                "mocha": "^10.7.3",
+                "nodemon": "^3.1.7",
                 "postcss-scss": "^4.0.3",
-                "sass": "^1.49.7",
-                "sass-true": "^6.0.1",
+                "sass": "^1.79.4",
+                "sass-true": "^8.1.0",
                 "sassdoc": "^2.7.3",
-                "stylelint": "^14.3.0",
-                "stylelint-config-sass-guidelines": "^9.0.1"
+                "stylelint": "^16.9.0",
+                "stylelint-config-sass-guidelines": "^12.1.0"
         },
         "scripts": {
                 "prepublishOnly": "npm run test",
-                "lint": "stylelint \"src/**/*.scss\"",
-                "fix": "stylelint \"src/**/*.scss\" --fix",
+                "lint": "stylelint \"{src,test}/**/*.scss\"",
+                "fix": "stylelint \"{src,test}/**/*.scss\" --fix",
                 "livelint": "nodemon --watch src --watch test -e scss -x 'echo \"BEGIN LINT\" && npm run lint && echo \"END LINT\"'",
                 "doc": "sassdoc src",
                 "test": "mocha test/test.js"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
new file mode 100644
index 0000000..b436de9
--- /dev/null
+++ b/pnpm-lock.yaml
@@ -0,0 +1,3399 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    devDependencies:
+      mocha:
+        specifier: ^10.7.3
+        version: 10.7.3
+      nodemon:
+        specifier: ^3.1.7
+        version: 3.1.7
+      postcss-scss:
+        specifier: ^4.0.3
+        version: 4.0.9(postcss@8.4.47)
+      sass:
+        specifier: ^1.79.4
+        version: 1.79.4
+      sass-true:
+        specifier: ^8.1.0
+        version: 8.1.0(sass@1.79.4)
+      sassdoc:
+        specifier: ^2.7.3
+        version: 2.7.4(chokidar@3.6.0)
+      stylelint:
+        specifier: ^16.9.0
+        version: 16.9.0
+      stylelint-config-sass-guidelines:
+        specifier: ^12.1.0
+        version: 12.1.0(postcss@8.4.47)(stylelint@16.9.0)
+
+packages:
+
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+    resolution: {integrity: sha512-Ff9+ksdQQB3rMncgqDK78uLznstjyfIf2Arnh22pW8kBpLs6rpKDwgnZT46hin5Hl1WzazzK64DOrhSwYpS7bQ==}
+
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+    engines: {node: '>=6.9.0'}
+
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+    engines: {node: '>=6.9.0'}
+
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+    engines: {node: '>=6.9.0'}
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+      ajv: 8.17.1
+      lodash.truncate: 4.4.2
+      slice-ansi: 4.0.0
+      string-width: 4.2.3
+      strip-ansi: 6.0.1
+
+  term-size@2.2.1: {}
+
+  through2-filter@3.0.0:
+    dependencies:
+      through2: 2.0.5
+      xtend: 4.0.2
+
+  through2@1.1.1:
+    dependencies:
+      readable-stream: 1.1.14
+      xtend: 4.0.2
+
+  through2@2.0.5:
+    dependencies:
+      readable-stream: 2.3.8
+      xtend: 4.0.2
+
+  to-absolute-glob@2.0.2:
+    dependencies:
+      is-absolute: 1.0.0
+      is-negated-glob: 1.0.0
+
+  to-readable-stream@1.0.0: {}
+
+  to-regex-range@5.0.1:
+    dependencies:
+      is-number: 7.0.0
+
+  to-through@2.0.0:
+    dependencies:
+      through2: 2.0.5
+
+  touch@3.1.1: {}
+
+  type-fest@0.8.1: {}
+
+  typedarray-to-buffer@3.1.5:
+    dependencies:
+      is-typedarray: 1.0.0
+
+  typedarray@0.0.6: {}
+
+  uglify-js@3.4.10:
+    dependencies:
+      commander: 2.19.0
+      source-map: 0.6.1
+
+  unc-path-regex@0.1.2: {}
+
+  undefsafe@2.0.5: {}
+
+  undici-types@5.26.5: {}
+
+  unique-stream@2.3.1:
+    dependencies:
+      json-stable-stringify-without-jsonify: 1.0.1
+      through2-filter: 3.0.0
+
+  unique-string@2.0.0:
+    dependencies:
+      crypto-random-string: 2.0.0
+
+  update-notifier@4.1.3:
+    dependencies:
+      boxen: 4.2.0
+      chalk: 3.0.0
+      configstore: 5.0.1
+      has-yarn: 2.1.0
+      import-lazy: 2.1.0
+      is-ci: 2.0.0
+      is-installed-globally: 0.3.2
+      is-npm: 4.0.0
+      is-yarn-global: 0.3.0
+      latest-version: 5.1.0
+      pupa: 2.1.1
+      semver-diff: 3.1.1
+      xdg-basedir: 4.0.0
+
+  upper-case@1.1.3: {}
+
+  url-parse-lax@3.0.0:
+    dependencies:
+      prepend-http: 2.0.0
+
+  util-deprecate@1.0.2: {}
+
+  value-or-function@3.0.0: {}
+
+  vinyl-fs@3.0.3:
+    dependencies:
+      fs-mkdirp-stream: 1.0.0
+      glob-stream: 6.1.0
+      graceful-fs: 4.2.11
+      is-valid-glob: 1.0.0
+      lazystream: 1.0.1
+      lead: 1.0.0
+      object.assign: 4.1.5
+      pumpify: 1.5.1
+      readable-stream: 2.3.8
+      remove-bom-buffer: 3.0.0
+      remove-bom-stream: 1.2.0
+      resolve-options: 1.1.0
+      through2: 2.0.5
+      to-through: 2.0.0
+      value-or-function: 3.0.0
+      vinyl: 2.2.1
+      vinyl-sourcemap: 1.1.0
+
+  vinyl-source-stream@1.1.2:
+    dependencies:
+      through2: 2.0.5
+      vinyl: 0.4.6
+
+  vinyl-sourcemap@1.1.0:
+    dependencies:
+      append-buffer: 1.0.2
+      convert-source-map: 1.9.0
+      graceful-fs: 4.2.11
+      normalize-path: 2.1.1
+      now-and-later: 2.0.1
+      remove-bom-buffer: 3.0.0
+      vinyl: 2.2.1
+
+  vinyl-string@1.0.2:
+    dependencies:
+      vinyl: 1.2.0
+
+  vinyl@0.4.6:
+    dependencies:
+      clone: 0.2.0
+      clone-stats: 0.0.1
+
+  vinyl@1.2.0:
+    dependencies:
+      clone: 1.0.4
+      clone-stats: 0.0.1
+      replace-ext: 0.0.1
+
+  vinyl@2.2.1:
+    dependencies:
+      clone: 2.1.2
+      clone-buffer: 1.0.0
+      clone-stats: 1.0.0
+      cloneable-readable: 1.1.3
+      remove-trailing-separator: 1.1.0
+      replace-ext: 1.0.1
+
+  which@1.3.1:
+    dependencies:
+      isexe: 2.0.0
+
+  widest-line@3.1.0:
+    dependencies:
+      string-width: 4.2.3
+
+  workerpool@6.5.1: {}
+
+  wrap-ansi@7.0.0:
+    dependencies:
+      ansi-styles: 4.3.0
+      string-width: 4.2.3
+      strip-ansi: 6.0.1
+
+  wrappy@1.0.2: {}
+
+  write-file-atomic@3.0.3:
+    dependencies:
+      imurmurhash: 0.1.4
+      is-typedarray: 1.0.0
+      signal-exit: 3.0.7
+      typedarray-to-buffer: 3.1.5
+
+  write-file-atomic@5.0.1:
+    dependencies:
+      imurmurhash: 0.1.4
+      signal-exit: 4.1.0
+
+  xdg-basedir@4.0.0: {}
+
+  xtend@4.0.2: {}
+
+  y18n@5.0.8: {}
+
+  yargs-parser@20.2.9: {}
+
+  yargs-unparser@2.0.0:
+    dependencies:
+      camelcase: 6.3.0
+      decamelize: 4.0.0
+      flat: 5.0.2
+      is-plain-obj: 2.1.0
+
+  yargs@16.2.0:
+    dependencies:
+      cliui: 7.0.4
+      escalade: 3.2.0
+      get-caller-file: 2.0.5
+      require-directory: 2.1.1
+      string-width: 4.2.3
+      y18n: 5.0.8
+      yargs-parser: 20.2.9
+
+  yocto-queue@0.1.0: {}
diff --git a/src/_contexts.scss b/src/_contexts.scss
index 7ffbb4e..ed376a2 100644
--- a/src/_contexts.scss
+++ b/src/_contexts.scss
@@ -15,6 +15,9 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:meta';
 @use './functions';
 
 ///
@@ -34,7 +37,7 @@ $stacks: ();
 /// @throw If context stack already exists
 ///
 @mixin create($stack-id) {
-    $noop: create($stack-id);
+        $noop: create($stack-id);
 }
 
 /// 
@@ -43,13 +46,13 @@ $stacks: ();
 /// @param {string} $stack-id - ID of context stack
 ///
 @function create($stack-id) {
-    @if map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $stacks: map-merge($stacks, ($stack-id: ())) !global;
+        $stacks: map.merge($stacks, ($stack-id: ())) !global;
 
-    @return null;
+        @return null;
 }
 
 /// 
@@ -58,7 +61,7 @@ $stacks: ();
 /// @param {string} $stack-id - ID of context stack
 ///
 @mixin clear($stack-id) {
-    $noop: clear($stack-id);
+        $noop: clear($stack-id);
 }
 
 /// 
@@ -67,14 +70,14 @@ $stacks: ();
 /// @param {string} $stack-id - ID of context stack
 ///
 @function clear($stack-id) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $context-stack: ();
-    $stacks: map-merge($stacks, ($stack-id: $context-stack)) !global;
+        $context-stack: ();
+        $stacks: map.merge($stacks, ($stack-id: $context-stack)) !global;
 
-    @return null;
+        @return null;
 }
 
 /// 
@@ -83,7 +86,7 @@ $stacks: ();
 /// @param {string} $stack-id - ID of context stack
 ///
 @mixin delete($stack-id) {
-    $noop: delete($stack-id);
+        $noop: delete($stack-id);
 }
 
 /// 
@@ -92,13 +95,13 @@ $stacks: ();
 /// @param {string} $stack-id - ID of context stack
 ///
 @function delete($stack-id) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $stacks: map-remove($stacks, $stack-id) !global;
+        $stacks: map.remove($stacks, $stack-id) !global;
 
-    @return null;
+        @return null;
 }
 
 /// 
@@ -109,7 +112,7 @@ $stacks: ();
 /// @param {any}    $data [()] - Data that belongs to the context
 ///
 @mixin push($stack-id, $id, $data: ()) {
-    $noop: push($stack-id, $id, $data);
+        $noop: push($stack-id, $id, $data);
 }
 
 /// 
@@ -122,16 +125,16 @@ $stacks: ();
 /// @return {list} A list with two items: 1 = context id, 2 = context data
 ///
 @function push($stack-id, $id, $data: ()) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $context:            $id $data;
-    $context-stack:      map-get($stacks, $stack-id);
-    $context-stack:      append($context-stack, $context);
-    $stacks: map-merge($stacks, ($stack-id: $context-stack)) !global;
+        $context:            $id $data;
+        $context-stack:      map.get($stacks, $stack-id);
+        $context-stack:      list.append($context-stack, $context);
+        $stacks: map.merge($stacks, ($stack-id: $context-stack)) !global;
 
-    @return $context;
+        @return $context;
 }
 
 /// 
@@ -142,7 +145,7 @@ $stacks: ();
 /// @throw If context stack doesn't exist
 ///
 @mixin pop($stack-id) {
-    $noop: pop($stack-id);
+        $noop: pop($stack-id);
 }
 
 /// 
@@ -153,27 +156,27 @@ $stacks: ();
 /// @return {list} A list with two items: 1 = context id, 2 = context data
 ///
 @function pop($stack-id) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $context-stack: map-get($stacks, $stack-id);
+        $context-stack: map.get($stacks, $stack-id);
 
-    @if length($context-stack) == 0 {
-        @error 'Context stack "#{inspect($stack-id)}" is already empty.';
-    }
+        @if list.length($context-stack) == 0 {
+                @error 'Context stack "#{inspect($stack-id)}" is already empty.';
+        }
 
-    $popped-context: nth($context-stack, -1);
+        $popped-context: list.nth($context-stack, -1);
 
-    @if length($context-stack) == 1 {
-        $context-stack: ();
-    } @else {
-        $context-stack: functions.list-slice($context-stack, 1, length($context-stack) - 1);
-    }
+        @if list.length($context-stack) == 1 {
+                $context-stack: ();
+        } @else {
+                $context-stack: functions.list-slice($context-stack, 1, list.length($context-stack) - 1);
+        }
 
-    $stacks: map-merge($stacks, ($stack-id: $context-stack)) !global;
+        $stacks: map.merge($stacks, ($stack-id: $context-stack)) !global;
 
-    @return $popped-context;
+        @return $popped-context;
 }
 
 /// 
@@ -186,15 +189,15 @@ $stacks: ();
 /// @throw If assertion fails
 ///
 @function assert-stack-must-contain($stack-id, $context-ids, $check-head-only: false) {
-    @if not contains($stack-id, $context-ids, $check-head-only) {
-        @error 'Must be called inside of contexts "#{inspect($context-ids)}".';
-    }
+        @if not contains($stack-id, $context-ids, $check-head-only) {
+                @error 'Must be called inside of contexts "#{inspect($context-ids)}".';
+        }
 
-    @return null;
+        @return null;
 }
 
 @mixin assert-stack-must-contain($stack-id, $context-ids, $check-head-only: false) {
-    $noop: assert-stack-must-contain($stack-id, $context-ids, $check-head-only);
+        $noop: assert-stack-must-contain($stack-id, $context-ids, $check-head-only);
 }
 
 /// 
@@ -207,15 +210,15 @@ $stacks: ();
 /// @throw If assertion fails
 ///
 @function assert-stack-must-not-contain($stack-id, $context-ids, $check-head-only: false) {
-    @if contains($stack-id, $context-ids, $check-head-only) {
-        @error 'Must not be called inside of contexts "#{inspect($context-ids)}".';
-    }
+        @if contains($stack-id, $context-ids, $check-head-only) {
+                @error 'Must not be called inside of contexts "#{inspect($context-ids)}".';
+        }
 
-    @return null;
+        @return null;
 }
 
 @mixin assert-stack-must-not-contain($stack-id, $context-ids, $check-head-only: false) {
-    $noop: assert-stack-must-not-contain($stack-id, $context-ids, $check-head-only);
+        $noop: assert-stack-must-not-contain($stack-id, $context-ids, $check-head-only);
 }
 
 /// 
@@ -228,29 +231,29 @@ $stacks: ();
 /// @return {bool} `true` if the context stack contains one of the context IDs, otherwise `false`
 ///
 @function contains($stack-id, $context-ids, $check-head-only: false) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $context-stack: map-get($stacks, $stack-id);
+        $context-stack: map.get($stacks, $stack-id);
 
-    @if length($context-stack) == 0 {
-        @return false;
-    }
+        @if list.length($context-stack) == 0 {
+                @return false;
+        }
 
-    $end-idx: if($check-head-only, length($context-stack), 1);
+        $end-idx: if($check-head-only, list.length($context-stack), 1);
 
-    @for $i from length($context-stack) through $end-idx {
-        $context: nth($context-stack, $i);
+        @for $i from list.length($context-stack) through $end-idx {
+                $context: list.nth($context-stack, $i);
 
-        @each $chk-context in $context-ids {
-            @if nth($context, 1) == $chk-context {
-                @return true;
-            }
-        }
-    }
+                @each $chk-context in $context-ids {
+                        @if list.nth($context, 1) == $chk-context {
+                                @return true;
+                        }
+                }
+        }
 
-    @return false;
+        @return false;
 }
 
 /// 
@@ -262,15 +265,15 @@ $stacks: ();
 /// @throw If assertion fails
 ///
 @function assert-stack-count($stack-id, $max-count) {
-    @if count($stack-id) > $max-count {
-        @error 'Maximum context count "#{inspect($max-count)}" exceeded.';
-    }
+        @if count($stack-id) > $max-count {
+                @error 'Maximum context count "#{inspect($max-count)}" exceeded.';
+        }
 
-    @return null;
+        @return null;
 }
 
 @mixin assert-stack-count($stack-id, $max-count) {
-    $noop: assert-stack-count($stack-id, $max-count);
+        $noop: assert-stack-count($stack-id, $max-count);
 }
 
 /// 
@@ -281,13 +284,13 @@ $stacks: ();
 /// @return {number} The number of contexts
 ///
 @function count($stack-id) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $context-stack: map-get($stacks, $stack-id);
+        $context-stack: map.get($stacks, $stack-id);
 
-    @return length($context-stack);
+        @return list.length($context-stack);
 }
 
 /// 
@@ -299,37 +302,37 @@ $stacks: ();
 /// @return {list} Null if no match was found, otherwise a list with two items: 1. context ID, 2. context data.
 ///
 @function get($stack-id, $type-or-level: null) {
-    @if not map-has-key($stacks, $stack-id) {
-        @error 'Context stack "#{inspect($stack-id)}" does not exist.';
-    }
+        @if not map.has-key($stacks, $stack-id) {
+                @error 'Context stack "#{inspect($stack-id)}" does not exist.';
+        }
 
-    $context-stack: map-get($stacks, $stack-id);
+        $context-stack: map.get($stacks, $stack-id);
 
-    @if length($context-stack) == 0 {
-        @return null;
-    }
+        @if list.length($context-stack) == 0 {
+                @return null;
+        }
 
-    @if type-of($type-or-level) == number {
-        $context: nth($context-stack, -$type-or-level);
+        @if meta.type-of($type-or-level) == number {
+                $context: list.nth($context-stack, -$type-or-level);
 
-        @return $context;
-    } @else {
-        @for $i from -1 through -(length($context-stack)) {
-            $context: nth($context-stack, $i);
+                @return $context;
+        } @else {
+                @for $i from -1 through -(list.length($context-stack)) {
+                        $context: list.nth($context-stack, $i);
 
-            @if type-of($type-or-level) == list {
-                @for $j from 1 through length($type-or-level) {
-                    $ctx: nth($type-or-level, $j);
+                        @if meta.type-of($type-or-level) == list {
+                                @for $j from 1 through list.length($type-or-level) {
+                                        $ctx: list.nth($type-or-level, $j);
 
-                    @if nth($context, 1) == $ctx {
-                        @return $context;
-                    }
-                }
-            } @else if nth($context, 1) == $type-or-level {
-                @return $context;
-            }
-        }
-    }
+                                        @if list.nth($context, 1) == $ctx {
+                                                @return $context;
+                                        }
+                                }
+                        } @else if list.nth($context, 1) == $type-or-level {
+                                @return $context;
+                        }
+                }
+        }
 
-    @return null;
+        @return null;
 }
diff --git a/src/_easing.scss b/src/_easing.scss
index 8bcfd39..939eda2 100644
--- a/src/_easing.scss
+++ b/src/_easing.scss
@@ -10,6 +10,8 @@
 ////
 
 @use 'sass:math';
+@use 'sass:map';
+@use 'sass:list';
 
 ///
 /// @access private
@@ -53,62 +55,62 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function cubic-bezier($x1, $y1, $x2, $y2, $x) {
-    //
-    // Cover simple cases
-    //
+        //
+        // Cover simple cases
+        //
 
-    @if ($x1 == $y1) and ($x2 == $y2) {
-        @return $x;
-    }
-    @if $x == 0 {
-        @return 0;
-    }
-    @if $x == 1 {
-        @return 1;
-    }
+        @if ($x1 == $y1) and ($x2 == $y2) {
+                @return $x;
+        }
+        @if $x == 0 {
+                @return 0;
+        }
+        @if $x == 1 {
+                @return 1;
+        }
 
-    //
-    // Generate samples
-    //
+        //
+        // Generate samples
+        //
 
-    $sample-pool-key: $x1 + '_' + $x2;
+        $sample-pool-key: $x1 + '_' + $x2;
 
-    @if not map-has-key($cubic-bezier-sample-pool, $sample-pool-key) {
-        $samples: ();
+        @if not map.has-key($cubic-bezier-sample-pool, $sample-pool-key) {
+                $samples: ();
 
-        @for $i from 0 through $cubic-bezier-sample-pool-size {
-            $samples: append($samples, cubic-bezier-func($x1, $x2, math.div($i, $cubic-bezier-sample-pool-size)));
-        }
+                @for $i from 0 through $cubic-bezier-sample-pool-size {
+                        $samples: list.append($samples, cubic-bezier-func($x1, $x2, math.div($i, $cubic-bezier-sample-pool-size)));
+                }
 
-        $cubic-bezier-sample-pool: map-merge($cubic-bezier-sample-pool, ($sample-pool-key: $samples)) !global;
-    }
+                $cubic-bezier-sample-pool: map.merge($cubic-bezier-sample-pool, ($sample-pool-key: $samples)) !global;
+        }
 
-    //
-    // Calculate cubic bezier
-    //
+        //
+        // Calculate cubic bezier
+        //
 
-    @return cubic-bezier-func($y1, $y2, cubic-bezier-t-for-x($x1, $x2, $x));
+        @return cubic-bezier-func($y1, $y2, cubic-bezier-t-for-x($x1, $x2, $x));
 }
 
 ///
 /// @access private
 ///
 @function cubic-bezier-func-a($p1, $p2) {
-    @return 1 - 3 * $p2 +  3 * $p1;
+        @return 1 - 3 * $p2 +  3 * $p1;
 }
 
 ///
 /// @access private
 ///
 @function cubic-bezier-func-b($p1, $p2) {
-    @return 3 * $p2 - 6 * $p1;
+        @return 3 * $p2 - 6 * $p1;
 }
 
 ///
 /// @access private
 ///
 @function cubic-bezier-func-c($p1) {
-    @return 3 * $p1;
+        @return 3 * $p1;
 }
 
 ///
@@ -117,7 +119,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @access private
 ///
 @function cubic-bezier-func($p1, $p2, $t) {
-    @return ((cubic-bezier-func-a($p1, $p2) * $t + cubic-bezier-func-b($p1, $p2)) * $t + cubic-bezier-func-c($p1)) * $t;
+        @return ((cubic-bezier-func-a($p1, $p2) * $t + cubic-bezier-func-b($p1, $p2)) * $t + cubic-bezier-func-c($p1)) * $t;
 }
 
 ///
@@ -126,7 +128,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @access private
 ///
 @function cubic-bezier-func-slope($p1, $p2, $t) {
-    @return 3 * cubic-bezier-func-a($p1, $p2) * $t * $t + 2 * cubic-bezier-func-b($p1, $p2) * $t + cubic-bezier-func-c($p1);
+        @return 3 * cubic-bezier-func-a($p1, $p2) * $t * $t + 2 * cubic-bezier-func-b($p1, $p2) * $t + cubic-bezier-func-c($p1);
 }
 
 ///
@@ -135,18 +137,18 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @access private
 ///
 @function cubic-bezier-newton-raphson($x1, $x2, $x, $t) {
-    @for $i from 1 through $cubic-bezier-newton-iters {
-        $cur-slope: cubic-bezier-func-slope($x1, $x2, $t);
+        @for $i from 1 through $cubic-bezier-newton-iters {
+                $cur-slope: cubic-bezier-func-slope($x1, $x2, $t);
 
-        @if $cur-slope == 0 {
-            @return $t;
-        }
+                @if $cur-slope == 0 {
+                        @return $t;
+                }
 
-        $cur-x: cubic-bezier-func($x1, $x2, $t) - $x;
-        $t:     $t - math.div($cur-x, $cur-slope);
-    }
+                $cur-x: cubic-bezier-func($x1, $x2, $t) - $x;
+                $t:     $t - math.div($cur-x, $cur-slope);
+        }
 
-    @return $t;
+        @return $t;
 }
 
 ///
@@ -155,26 +157,26 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @access private
 ///
 @function cubic-bezier-binary-subdivide($x1, $x2, $x, $a, $b) {
-    $cur-x: 0;
-    $cur-t: 0;
-    $i:     0;
+        $cur-x: 0;
+        $cur-t: 0;
+        $i:     0;
 
-    @while $i < $cubic-bezier-subdiv-max-iters {
-        $cur-t: $a + ($b - $a) / 2;
-        $cur-x: cubic-bezier-func($x1, $x2, $cur-t) - $x;
+        @while $i < $cubic-bezier-subdiv-max-iters {
+                $cur-t: $a + ($b - $a) / 2;
+                $cur-x: cubic-bezier-func($x1, $x2, $cur-t) - $x;
 
-        @if $cur-x > 0 {
-            $b: $cur-t;
-        } @else {
-            $a: $cur-t;
-        }
+                @if $cur-x > 0 {
+                        $b: $cur-t;
+                } @else {
+                        $a: $cur-t;
+                }
 
-        @if abs($cur-x) < $cubic-bezier-subdiv-precision {
-            @return $cur-t;
-        }
-    }
+                @if math.abs($cur-x) < $cubic-bezier-subdiv-precision {
+                        @return $cur-t;
+                }
+        }
 
-    @return $cur-t;
+        @return $cur-t;
 }
 
 ///
@@ -183,30 +185,41 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @access private
 ///
 @function cubic-bezier-t-for-x($x1, $x2, $x) {
-    $sample-pool-key: $x1 + '_' + $x2;
-    $samples:         map-get($cubic-bezier-sample-pool, $sample-pool-key);
+        $sample-pool-key: $x1 + '_' + $x2;
+        $samples:         map.get($cubic-bezier-sample-pool, $sample-pool-key);
 
-    $intv-start:  0;
-    $cur-sample:  1;
-    $last-sample: $cubic-bezier-sample-pool-size;
+        $intv-start:  0;
+        $cur-sample:  1;
+        $last-sample: $cubic-bezier-sample-pool-size;
 
-    @while ($cur-sample != $last-sample) and (nth($samples, $cur-sample) <= $x) {
-        $intv-start: $intv-start + math.div(1, $cubic-bezier-sample-pool-size);
-        $cur-sample: $cur-sample + 1;
-    }
-    $cur-sample: $cur-sample - 1;
+        @while ($cur-sample != $last-sample) and (list.nth($samples, $cur-sample) <= $x) {
+                $intv-start: $intv-start + math.div(1, $cubic-bezier-sample-pool-size);
+                $cur-sample: $cur-sample + 1;
+        }
+        $cur-sample: $cur-sample - 1;
 
-    $dist:    math.div($x - nth($samples, $cur-sample), nth($samples, $cur-sample + 1) - nth($samples, $cur-sample));
-    $guess-t: $intv-start + math.div($dist, $cubic-bezier-sample-pool-size);
+        $dist:    math.div($x - list.nth($samples, $cur-sample), list.nth($samples, $cur-sample + 1) - list.nth($samples, $cur-sample));
+        $guess-t: $intv-start + math.div($dist, $cubic-bezier-sample-pool-size);
 
-    $init-slope: cubic-bezier-func-slope($x1, $x2, $guess-t);
-    @if $init-slope >= $cubic-bezier-newton-min-slope {
-        @return cubic-bezier-newton-raphson($x1, $x2, $x, $guess-t);
-    } @else if $init-slope == 0 {
-        @return $guess-t;
-    } @else {
-        @return cubic-bezier-binary-subdivide($x1, $x2, $x, $intv-start, $intv-start + 1 / $cubic-bezier-sample-pool-size);
-    }
+        $init-slope: cubic-bezier-func-slope($x1, $x2, $guess-t);
+        @if $init-slope >= $cubic-bezier-newton-min-slope {
+                @return cubic-bezier-newton-raphson($x1, $x2, $x, $guess-t);
+        } @else if $init-slope == 0 {
+                @return $guess-t;
+        } @else {
+                @return cubic-bezier-binary-subdivide($x1, $x2, $x, $intv-start, $intv-start + 1 / $cubic-bezier-sample-pool-size);
+        }
+}
+
+/// 
+/// Linear easing function.
+///
+/// @param {number} $x - Progress between 0 and 1 inclusive
+///
+/// @return {number}
+///
+@function linear($x) {
+        @return $x;
 }
 
 /// 
@@ -217,7 +230,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease($x) {
-    @return cubic-bezier(.25, .1, .25, 1, $x);
+        @return cubic-bezier(.25, .1, .25, 1, $x);
 }
 
 /// 
@@ -228,7 +241,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in($x) {
-    @return  cubic-bezier(.42, 0, 1, 1, $x);
+        @return  cubic-bezier(.42, 0, 1, 1, $x);
 }
 
 /// 
@@ -239,7 +252,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out($x) {
-    @return  cubic-bezier(0, 0, .58, 1, $x);
+        @return  cubic-bezier(0, 0, .58, 1, $x);
 }
 
 /// 
@@ -250,7 +263,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out($x) {
-    @return  cubic-bezier(.42, 0, .58, 1, $x);
+        @return  cubic-bezier(.42, 0, .58, 1, $x);
 }
 
 /// 
@@ -261,7 +274,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-sine($x) {
-    @return  cubic-bezier(.47, 0, .745, .715, $x);
+        @return  cubic-bezier(.47, 0, .745, .715, $x);
 }
 
 /// 
@@ -272,7 +285,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-sine($x) {
-    @return  cubic-bezier(.39, .575, .565, 1, $x);
+        @return  cubic-bezier(.39, .575, .565, 1, $x);
 }
 
 /// 
@@ -283,7 +296,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-sine($x) {
-    @return  cubic-bezier(.445, .05, .55, .95, $x);
+        @return  cubic-bezier(.445, .05, .55, .95, $x);
 }
 
 /// 
@@ -294,7 +307,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-quad($x) {
-    @return  cubic-bezier(.55, .085, .68, .53, $x);
+        @return  cubic-bezier(.55, .085, .68, .53, $x);
 }
 
 /// 
@@ -305,7 +318,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-quad($x) {
-    @return  cubic-bezier(.25, .46, .45, .94, $x);
+        @return  cubic-bezier(.25, .46, .45, .94, $x);
 }
 
 /// 
@@ -316,7 +329,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-quad($x) {
-    @return  cubic-bezier(.455, .03, .515, .955, $x);
+        @return  cubic-bezier(.455, .03, .515, .955, $x);
 }
 
 /// 
@@ -327,7 +340,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-cubic($x) {
-    @return  cubic-bezier(.55, .055, .675, .19, $x);
+        @return  cubic-bezier(.55, .055, .675, .19, $x);
 }
 
 /// 
@@ -338,7 +351,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-cubic($x) {
-    @return  cubic-bezier(.215, .61, .355, 1, $x);
+        @return  cubic-bezier(.215, .61, .355, 1, $x);
 }
 
 /// 
@@ -349,7 +362,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-cubic($x) {
-    @return  cubic-bezier(.645, .045, .355, 1, $x);
+        @return  cubic-bezier(.645, .045, .355, 1, $x);
 }
 
 /// 
@@ -360,7 +373,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-quart($x) {
-    @return  cubic-bezier(.895, .03, .685, .22, $x);
+        @return  cubic-bezier(.895, .03, .685, .22, $x);
 }
 
 /// 
@@ -371,7 +384,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-quart($x) {
-    @return  cubic-bezier(.165, .84, .44, 1, $x);
+        @return  cubic-bezier(.165, .84, .44, 1, $x);
 }
 
 /// 
@@ -382,7 +395,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-quart($x) {
-    @return  cubic-bezier(.77, 0, .175, 1, $x);
+        @return  cubic-bezier(.77, 0, .175, 1, $x);
 }
 
 /// 
@@ -393,7 +406,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-quint($x) {
-    @return  cubic-bezier(.755, .05, .855, .06, $x);
+        @return  cubic-bezier(.755, .05, .855, .06, $x);
 }
 
 /// 
@@ -404,7 +417,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-quint($x) {
-    @return  cubic-bezier(.23, 1, .32, 1, $x);
+        @return  cubic-bezier(.23, 1, .32, 1, $x);
 }
 
 /// 
@@ -415,7 +428,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-quint($x) {
-    @return  cubic-bezier(.86, 0, .07, 1, $x);
+        @return  cubic-bezier(.86, 0, .07, 1, $x);
 }
 
 /// 
@@ -426,7 +439,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-expo($x) {
-    @return  cubic-bezier(.95, .05, .795, .035, $x);
+        @return  cubic-bezier(.95, .05, .795, .035, $x);
 }
 
 /// 
@@ -437,7 +450,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-expo($x) {
-    @return  cubic-bezier(.19, 1, .22, 1, $x);
+        @return  cubic-bezier(.19, 1, .22, 1, $x);
 }
 
 /// 
@@ -448,7 +461,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-expo($x) {
-    @return  cubic-bezier(1, 0, 0, 1, $x);
+        @return  cubic-bezier(1, 0, 0, 1, $x);
 }
 
 /// 
@@ -459,7 +472,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-circ($x) {
-    @return  cubic-bezier(.6, .04, .98, .335, $x);
+        @return  cubic-bezier(.6, .04, .98, .335, $x);
 }
 
 /// 
@@ -470,7 +483,7 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-out-circ($x) {
-    @return  cubic-bezier(.075, .82, .165, 1, $x);
+        @return  cubic-bezier(.075, .82, .165, 1, $x);
 }
 
 /// 
@@ -481,5 +494,5 @@ $cubic-bezier-subdiv-max-iters: 10 !default;
 /// @return {number}
 ///
 @function ease-in-out-circ($x) {
-    @return  cubic-bezier(.785, .135, .15, .86, $x);
+        @return  cubic-bezier(.785, .135, .15, .86, $x);
 }
diff --git a/src/_functions.scss b/src/_functions.scss
index 9dd14b1..74cc1b5 100644
--- a/src/_functions.scss
+++ b/src/_functions.scss
@@ -10,9 +10,32 @@
 ////
 
 @use 'sass:map';
+@use 'sass:list';
 @use 'sass:math';
+@use 'sass:string';
+@use 'sass:meta';
 @use './vars';
 
+$numbers: ('0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9);
+
+$units: (
+        'px':   1px,
+        'cm':   1cm,
+        'mm':   1mm,
+        '%':    1%,
+        'ch':   1ch,
+        'pc':   1pc,
+        'in':   1in,
+        'em':   1em,
+        'rem':  1rem,
+        'pt':   1pt,
+        'ex':   1ex,
+        'vw':   1vw,
+        'vh':   1vh,
+        'vmin': 1vmin,
+        'vmax': 1vmax
+);
+
 /// 
 /// Replace a substring with a new string.
 ///
@@ -23,13 +46,13 @@
 /// @return {string} A string with all instances of $search replaced with $replace
 ///
 @function str-replace($string, $search, $replace) {
-    $index: str-index($string, $search);
+        $index: string.index($string, $search);
 
-    @if $index {
-        @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
-    }
+        @if $index {
+                @return string.slice($string, 1, $index - 1) + $replace + str-replace(string.slice($string, $index + string.length($search)), $search, $replace);
+        }
 
-    @return $string;
+        @return $string;
 }
 
 /// 
@@ -41,17 +64,17 @@
 /// @return {string}
 ///
 @function str-implode($list, $glue: '') {
-    $result: '';
+        $result: '';
 
-    @each $item in $list {
-        $result: $result + if(length($item) > 1, str-implode($item, $glue), $item);
+        @each $item in $list {
+                $result: $result + if(list.length($item) > 1, str-implode($item, $glue), $item);
 
-        @if $item != nth($list, length($list)) {
-            $result: $result + $glue;
-        }
-    }
+                @if $item != list.nth($list, list.length($list)) {
+                        $result: $result + $glue;
+                }
+        }
 
-    @return $result;
+        @return $result;
 }
 
 /// 
@@ -63,18 +86,18 @@
 ///
 /// @return {list} A slice of the list
 ///
-@function list-slice($list, $start: 1, $end: length($list)) {
-    $result: ();
+@function list-slice($list, $start: 1, $end: list.length($list)) {
+        $result: ();
 
-    @if $end >= $start {
-        @for $i from $start through $end {
-            @if $i != 0 {
-                $result: append($result, nth($list, $i), list-separator($list));
-            }
-        }
-    }
+        @if $end >= $start {
+                @for $i from $start through $end {
+                        @if $i != 0 {
+                                $result: list.append($result, list.nth($list, $i), list.separator($list));
+                        }
+                }
+        }
 
-    @return $result;
+        @return $result;
 }
 
 /// 
@@ -86,15 +109,15 @@
 /// @return {list} A list with $value at the beginning, followed by the other items
 ///
 @function list-prepend($list, $value) {
-    $result: append((), $value, list-separator($list));
+        $result: list.append((), $value, list.separator($list));
 
-    @if length($list) > 0 {
-        @for $i from 1 through length($list) {
-            $result: append($result, nth($list, $i), list-separator($list));
-        }
-    }
+        @if list.length($list) > 0 {
+                @for $i from 1 through list.length($list) {
+                        $result: list.append($result, list.nth($list, $i), list.separator($list));
+                }
+        }
 
-    @return $result;
+        @return $result;
 }
 
 /// 
@@ -105,15 +128,15 @@
 /// @return {list} Teh reversed list
 ///
 @function list-reverse($list) {
-    @if length($list) == 0 {
-        @return $list;
-    }
+        @if list.length($list) == 0 {
+                @return $list;
+        }
 
-    $result: ();
-    @for $i from length($list) * -1 through -1 {
-        $result: append($result, nth($list, abs($i)));
-    }
-    @return $result;
+        $result: ();
+        @for $i from list.length($list) * -1 through -1 {
+                $result: list.append($result, list.nth($list, math.abs($i)));
+        }
+        @return $result;
 }
 
 /// 
@@ -126,52 +149,52 @@
 ///
 /// @return {list} Sorted list
 ///
-@function quicksort($l, $left: 1, $right: length($l)) {
-    @if $left < $right {
-        $pvr:   quicksort-partition($l, $left, $right);
-        $pivot: nth($pvr, 1);
-        $l:     nth($pvr, 2);
-        $l:     quicksort($l, $left, $pivot);
-        $l:     quicksort($l, $pivot + 1, $right);
-    }
+@function quicksort($l, $left: 1, $right: list.length($l)) {
+        @if $left < $right {
+                $pvr:   quicksort-partition($l, $left, $right);
+                $pivot: list.nth($pvr, 1);
+                $l:     list.nth($pvr, 2);
+                $l:     quicksort($l, $left, $pivot);
+                $l:     quicksort($l, $pivot + 1, $right);
+        }
 
-    @return $l;
+        @return $l;
 }
 
 /// 
 /// @access private
 ///
 @function quicksort-partition($l, $left, $right) {
-    $start: true;
-    $i:     $left;
-    $j:     $right - 1;
-    $pivot: nth($l, $right);
+        $start: true;
+        $i:     $left;
+        $j:     $right - 1;
+        $pivot: list.nth($l, $right);
 
-    @while ($i < $j) or $start {
-        @while (nth($l, $i) < $pivot) and ($i < $right - 1) {
-            $i: $i + 1;
-        }
+        @while ($i < $j) or $start {
+                @while (list.nth($l, $i) < $pivot) and ($i < $right - 1) {
+                        $i: $i + 1;
+                }
 
-        @while (nth($l, $j)>= $pivot) and ($j > $left) {
-            $j: $j - 1;
-        }
+                @while (list.nth($l, $j)>= $pivot) and ($j > $left) {
+                        $j: $j - 1;
+                }
 
-        @if $i < $j {
-            $i-val: nth($l, $i);
-            $l:     set-nth($l, $i, nth($l, $j));
-            $l:     set-nth($l, $j, $i-val);
-        }
+                @if $i < $j {
+                        $i-val: list.nth($l, $i);
+                        $l:     list.set-nth($l, $i, list.nth($l, $j));
+                        $l:     list.set-nth($l, $j, $i-val);
+                }
 
-        $start: false;
-    }
+                $start: false;
+        }
 
-    @if nth($l, $i) > $pivot {
-        $i-val: nth($l, $i);
-        $l:     set-nth($l, $i, nth($l, $right));
-        $l:     set-nth($l, $right, $i-val);
-    }
+        @if list.nth($l, $i) > $pivot {
+                $i-val: list.nth($l, $i);
+                $l:     list.set-nth($l, $i, list.nth($l, $right));
+                $l:     list.set-nth($l, $right, $i-val);
+        }
 
-    @return $i $l;
+        @return $i $l;
 }
 
 /// 
@@ -185,10 +208,10 @@
 /// @return {any} Either the value assigned to $key or $default
 ///
 @function map-get-default($map, $key, $keys...) {
-    $default: nth($keys, length($keys));
-    $keys:    list-slice($keys, 1, length($keys) - 1);
+        $default: list.nth($keys, list.length($keys));
+        $keys:    list-slice($keys, 1, list.length($keys) - 1);
 
-    @return if(map-has-key($map, $key, $keys...), map-get($map, $key, $keys...), $default);
+        @return if(map.has-key($map, $key, $keys...), map.get($map, $key, $keys...), $default);
 }
 
 /// 
@@ -199,29 +222,29 @@
 /// @return {string}
 ///
 @function map-print($map) {
-    $output: '';
+        $output: '';
 
-    @each $key, $value in $map {
-        $value-str: '';
+        @each $key, $value in $map {
+                $value-str: '';
 
-        @if type-of($value) == map {
-            $value-str: '[ ' + map-print($value) + ' ]';
-        } @else if type-of($value) == list {
-            $value-str: '[ ' + str-implode($value, ', ') + ' ]';
-        } @else if type-of($value) == string {
-            $value-str: '\'' + $value + '\'';
-        } @else {
-            $value-str: $value;
-        }
+                @if meta.type-of($value) == map {
+                        $value-str: '[ ' + map-print($value) + ' ]';
+                } @else if meta.type-of($value) == list {
+                        $value-str: '[ ' + str-implode($value, ', ') + ' ]';
+                } @else if meta.type-of($value) == string {
+                        $value-str: '\'' + $value + '\'';
+                } @else {
+                        $value-str: $value;
+                }
 
-        @if $output == '' {
-            $output: $key + ': ' + $value-str;
-        } @else {
-            $output: $output + ', ' + $key + ': ' + $value-str;
-        }
-    }
+                @if $output == '' {
+                        $output: $key + ': ' + $value-str;
+                } @else {
+                        $output: $output + ', ' + $key + ': ' + $value-str;
+                }
+        }
 
-    @return $output;
+        @return $output;
 }
 
 /// 
@@ -233,35 +256,35 @@
 /// @return {bool} `true` if the selector matches at least one suffix, otherwise `false`.
 ///
 @function selector-suffix-match($selector, $suffixes) {
-    $match: true;
+        $match: true;
 
-    @each $sel in $selector {
-        @if $match {
-            $sel-match: false;
+        @each $sel in $selector {
+                @if $match {
+                        $sel-match: false;
 
-            @each $suffix in $suffixes {
-                @if not $sel-match {
-                    $suf-match: true;
+                        @each $suffix in $suffixes {
+                                @if not $sel-match {
+                                        $suf-match: true;
 
-                    @for $i from 1 through length($suffix) {
-                        @if $suf-match and (nth($sel, -$i) != nth($suffix, -$i)) {
-                            $suf-match: false;
-                        }
-                    }
+                                        @for $i from 1 through list.length($suffix) {
+                                                @if $suf-match and (list.nth($sel, -$i) != list.nth($suffix, -$i)) {
+                                                        $suf-match: false;
+                                                }
+                                        }
 
-                    @if $suf-match {
-                        $sel-match: true;
-                    }
-                }
-            }
+                                        @if $suf-match {
+                                                $sel-match: true;
+                                        }
+                                }
+                        }
 
-            @if not $sel-match {
-                $match: false;
-            }
-        }
-    }
+                        @if not $sel-match {
+                                $match: false;
+                        }
+                }
+        }
 
-    @return $match;
+        @return $match;
 }
 
 /// 
@@ -272,7 +295,7 @@
 /// @return {number} Unit-less variable
 ///
 @function strip-unit($n) {
-    @return math.div($n, $n * 0 + 1);
+        @return math.div($n, $n * 0 + 1);
 }
 
 /// 
@@ -284,7 +307,62 @@
 /// @return {number} Pixel value converted to rem
 ///
 @function px-to-rem($size, $base: vars.$root-size) {
-    @return math.div($size, $base) * 1rem;
+        @return math.div($size, $base) * 1rem;
+}
+
+///
+/// Casts a string into a number
+///
+/// @param {string|number} $value
+///
+/// @return {number}
+///
+@function to-number($value) {
+        @if meta.type-of($value) == 'number' {
+                @return $value;
+        }
+        @if meta.type-of($value) != 'string' {
+                @error 'Value for `to-number` should be a number or a string.';
+        }
+    
+        $result:  0;
+        $digits:  0;
+        $minus:   string.slice($value, 1, 1) == '-';
+    
+        @for $i from if($minus, 2, 1) through string.length($value) {
+                $character: string.slice($value, $i, $i);
+        
+                @if not list.index(map.keys($numbers), $character) and $character != '.' {
+                        @return to-length(if($minus, -$result, $result), string.slice($value, $i));
+                }
+        
+                @if $character == '.' {
+                        $digits: 1; 
+                } @else if $digits == 0 {
+                        $result: $result * 10 + map.get($numbers, $character);  
+                } @else {
+                        $digits: $digits * 10;
+                        $result: $result + math.div(map.get($numbers, $character), $digits);
+                }
+        }  
+  
+        @return if($minus, -$result, $result);
+}
+
+///
+/// Add $unit to $value
+///
+/// @param {number} $value - Value to add unit to
+/// @param {string} $unit  - String representation of the unit
+///
+/// @return {number} $value expressed in $unit
+///
+@function to-length($value, $unit) {
+        @if not list.index(map.keys($units), $unit) {
+                @error 'Invalid unit `#{$unit}`.';
+        }
+    
+        @return $value * map.get($units, $unit);
 }
 
 /// 
@@ -293,5 +371,5 @@
 /// @content
 ///
 @mixin execute {
-    @content;
+        @content;
 }
diff --git a/src/_gradients.scss b/src/_gradients.scss
index 6575482..345a9f1 100644
--- a/src/_gradients.scss
+++ b/src/_gradients.scss
@@ -15,8 +15,11 @@
 /// @access public
 ////
 
+@use 'sass:color';
+@use 'sass:list';
 @use 'sass:math';
 @use 'sass:meta';
+@use 'sass:string';
 @use './functions';
 @use './easing';
 
@@ -135,144 +138,136 @@ $easing-gradient-steps: 10 !default;
 ///   }
 ///
 @function easing-gradient($type, $dir, $stop, $stops...) {
-    $pos-template: null;
-    $stops:        functions.list-prepend($stops, $stop);
+        $pos-template: null;
+        $stops:        functions.list-prepend($stops, $stop);
 
-    $last-positioned-stop: 1;
-    $generated-stops:      ();
+        $last-positioned-stop: 1;
+        $generated-stops:      ();
 
-    //
-    // Generate gradient
-    //
+        //
+        // Generate gradient
+        //
 
-    @for $i from 1 through length($stops) {
-        $stop: nth($stops, $i);
+        @for $i from 1 through list.length($stops) {
+                $stop: list.nth($stops, $i);
 
-        @if $i == 1 {
-            @if not easing-gradient-is-color-stop($stop) {
-                @error 'The first color stop argument must be a color stop.';
-            }
+                @if $i == 1 {
+                        @if not easing-gradient-is-color-stop($stop) {
+                                @error 'The first color stop argument must be a color stop.';
+                        }
 
-            @if type-of($stop) == color {
-                //
-                // The first color stop is unpositioned. The default position for the first
-                // color stop is 0, which is explicitly added for easier calculations.
-                //
+                        @if meta.type-of($stop) == color {
+                                //
+                                // The first color stop is unpositioned. The default position for the first
+                                // color stop is 0, which is explicitly added for easier calculations.
+                                //
 
-                $stop:  $stop 0;
-                $stops: set-nth($stops, $i, $stop);
-            }
+                                $stop:  $stop 0;
+                                $stops: list.set-nth($stops, $i, $stop);
+                        }
 
-            $generated-stops: append($generated-stops, functions.str-implode($stop, ' '));
-        } @else if easing-gradient-is-positioned-color-stop($stop) or ($i == length($stops)) {
-            @if not easing-gradient-is-color-stop($stop) {
-                @error 'The last color stop argument must be a color stop.';
-            }
+                        $generated-stops: list.append($generated-stops, functions.str-implode($stop, ' '));
+                } @else if easing-gradient-is-positioned-color-stop($stop) or ($i == list.length($stops)) {
+                        @if not easing-gradient-is-color-stop($stop) {
+                                @error 'The last color stop argument must be a color stop.';
+                        }
 
-            //
-            // Either the current stops list item is a positioned color stop, or the end of
-            // the stops list has been reached.
-            //
+                        //
+                        // Either the current stops list item is a positioned color stop, or the end of
+                        // the stops list has been reached.
+                        //
 
-            @if (type-of($stop) == color) and ($i == length($stops)) {
-                //
-                // The current stop is an unpositioned color stop, which means this is the end
-                // of the stops list. The default position for the last color stop is 100%, which
-                // is explicitly added for easier calculations.
-                //
+                        @if (meta.type-of($stop) == color) and ($i == list.length($stops)) {
+                                //
+                                // The current stop is an unpositioned color stop, which means this is the end
+                                // of the stops list. The default position for the last color stop is 100%, which
+                                // is explicitly added for easier calculations.
+                                //
 
-                $stop:  $stop 100%;
-                $stops: set-nth($stops, $i, $stop);
-            }
+                                $stop:  $stop 100%;
+                                $stops: list.set-nth($stops, $i, $stop);
+                        }
 
-            //
-            // Now the current color stop is guaranteed to be a positioned color stop.
-            //
+                        //
+                        // Now the current color stop is guaranteed to be a positioned color stop.
+                        //
 
-            @if $i > $last-positioned-stop + 1 {
-                //
-                // There is at least one stops list item (unpositioned color stop or easing function)
-                // between the last positioned color stop and the current stops list item. Interpolate
-                // the positions of all stops list items that are color stops.
-                //
+                        @if $i > $last-positioned-stop + 1 {
+                                //
+                                // There is at least one stops list item (unpositioned color stop or easing function)
+                                // between the last positioned color stop and the current stops list item. Interpolate
+                                // the positions of all stops list items that are color stops.
+                                //
 
-                $interpolated-stops: easing-gradient-interpolate-stop-positions(
-                    nth($stops, $last-positioned-stop),
-                    functions.list-slice($stops, $last-positioned-stop + 1, $i - 1),
-                    $stop
-                );
+                                $interpolated-stops: easing-gradient-interpolate-stop-positions(list.nth($stops, $last-positioned-stop),
+                                functions.list-slice($stops, $last-positioned-stop + 1, $i - 1),
+                                $stop);
 
-                $new-stops: join(
-                    functions.list-slice($stops, 1, $last-positioned-stop),
-                    $interpolated-stops
-                );
-                $new-stops: join(
-                    $new-stops,
-                    functions.list-slice($stops, $i)
-                );
-                $stops: $new-stops;
-            }
+                                $new-stops: list.join(functions.list-slice($stops, 1, $last-positioned-stop),
+                                $interpolated-stops);
+                                $new-stops: list.join($new-stops,
+                                functions.list-slice($stops, $i));
+                                $stops: $new-stops;
+                        }
 
-            //
-            // Now all color stops between this one and the last positioned one have
-            // interpolated positions.
-            // Next task is to perform an easing transition between all color stops that
-            // have an easing function specified. The rest can be left alone since the
-            // browser will automatically apply a linear transition between them.
-            //
+                        //
+                        // Now all color stops between this one and the last positioned one have
+                        // interpolated positions.
+                        // Next task is to perform an easing transition between all color stops that
+                        // have an easing function specified. The rest can be left alone since the
+                        // browser will automatically apply a linear transition between them.
+                        //
 
-            $j: $last-positioned-stop + 1;
-            @while $j <= $i {
-                $easing:    null;
-                $prev-stop: nth($stops, $j - 1);
-                $next-stop: nth($stops, $j);
+                        $j: $last-positioned-stop + 1;
+                        @while $j <= $i {
+                                $easing:    null;
+                                $prev-stop: list.nth($stops, $j - 1);
+                                $next-stop: list.nth($stops, $j);
 
-                @if not easing-gradient-is-color-stop($next-stop) {
-                    $j: $j + 1;
+                                @if not easing-gradient-is-color-stop($next-stop) {
+                                        $j: $j + 1;
 
-                    $easing:    $next-stop;
-                    $next-stop: nth($stops, $j);
+                                        $easing:    $next-stop;
+                                        $next-stop: list.nth($stops, $j);
 
-                    @if not easing-gradient-is-color-stop($next-stop) {
-                        @error 'There can be at most one interpolation hint between to color stops.';
-                    }
-                }
+                                        @if not easing-gradient-is-color-stop($next-stop) {
+                                                @error 'There can be at most one interpolation hint between to color stops.';
+                                        }
+                                }
 
-                @if $easing != null {
-                    @if type-of($easing) == number {
-                        @error 'Midpoint shifts are not supported.';
-                    }
+                                @if $easing != null {
+                                        @if meta.type-of($easing) == number {
+                                                @error 'Midpoint shifts are not supported.';
+                                        }
 
-                    $easing-func: null;
-                    $easing-args: ();
+                                        $easing-func: null;
+                                        $easing-args: ();
 
-                    @if type-of($easing) == list {
-                        $easing-args: functions.list-slice($easing, 2);
-                        $easing:      nth($easing, 1);
-                    }
+                                        @if meta.type-of($easing) == list {
+                                                $easing-args: functions.list-slice($easing, 2);
+                                                $easing:      list.nth($easing, 1);
+                                        }
 
-                    $generated-stops: join(
-                        $generated-stops,
-                        easing-gradient-ease-stops($prev-stop, $next-stop, $easing, $easing-args)
-                    );
-                } @else {
-                    $generated-stops: append($generated-stops, functions.str-implode($next-stop, ' '));
-                }
+                                        $generated-stops: list.join($generated-stops,
+                                        easing-gradient-ease-stops($prev-stop, $next-stop, $easing, $easing-args));
+                                } @else {
+                                        $generated-stops: list.append($generated-stops, functions.str-implode($next-stop, ' '));
+                                }
 
-                $j: $j + 1;
-            }
+                                $j: $j + 1;
+                        }
 
-            $last-positioned-stop: $i;
-        }
-    }
+                        $last-positioned-stop: $i;
+                }
+        }
 
-    @if $type == 'linear' {
-        @return linear-gradient($dir, unquote(functions.str-implode($generated-stops, ', ')));
-    } @else if $type == 'radial' {
-        @return radial-gradient($dir, unquote(functions.str-implode($generated-stops, ', ')));
-    } @else {
-        @error 'Invalid gradient type: #{inspect($type)}.';
-    }
+        @if $type == 'linear' {
+                @return linear-gradient($dir, string.unquote(functions.str-implode($generated-stops, ', ')));
+        } @else if $type == 'radial' {
+                @return radial-gradient($dir, string.unquote(functions.str-implode($generated-stops, ', ')));
+        } @else {
+                @error 'Invalid gradient type: #{inspect($type)}.';
+        }
 }
 
 ///
@@ -281,7 +276,7 @@ $easing-gradient-steps: 10 !default;
 /// @see {function} easing-gradient
 ///
 @function easing-linear-gradient($dir, $stop, $stops...) {
-    @return easing-gradient('linear', $dir, $stop, $stops...);
+        @return easing-gradient('linear', $dir, $stop, $stops...);
 }
 
 ///
@@ -290,7 +285,7 @@ $easing-gradient-steps: 10 !default;
 /// @see {function} easing-gradient
 ///
 @function easing-radial-gradient($dir, $stop, $stops...) {
-    @return easing-gradient('radial', $dir, $stop, $stops...);
+        @return easing-gradient('radial', $dir, $stop, $stops...);
 }
 
 ///
@@ -299,24 +294,24 @@ $easing-gradient-steps: 10 !default;
 /// @access private
 ///
 @function easing-gradient-ease-stops($prev-stop, $next-stop, $easing, $easing-args: ()) {
-    @if $easing == 'steps' {
-        $steps: null;
-        $jump:  null;
+        @if $easing == 'steps' {
+                $steps: null;
+                $jump:  null;
 
-        @if length($easing-args) > 1 {
-            $steps: nth($easing-args, 1);
-            $jump:  nth($easing-args, 2);
-        } @else {
-            $steps: nth($easing-args, 1);
-            $jump:  jump-end;
-        }
+                @if list.length($easing-args) > 1 {
+                        $steps: list.nth($easing-args, 1);
+                        $jump:  list.nth($easing-args, 2);
+                } @else {
+                        $steps: list.nth($easing-args, 1);
+                        $jump:  jump-end;
+                }
 
-        @return easing-gradient-steps-stops($prev-stop, $next-stop, $steps, $jump);
-    } @else {
-        $easing-func: get-function($easing, $module: easing);
+                @return easing-gradient-steps-stops($prev-stop, $next-stop, $steps, $jump);
+        } @else {
+                $easing-func: meta.get-function($easing, $module: easing);
 
-        @return easing-gradient-bezier-stops($prev-stop, $next-stop, $easing-func, $easing-args);
-    }
+                @return easing-gradient-bezier-stops($prev-stop, $next-stop, $easing-func, $easing-args);
+        }
 }
 
 ///
@@ -325,74 +320,74 @@ $easing-gradient-steps: 10 !default;
 /// @access private
 ///
 @function easing-gradient-bezier-stops($prev-stop, $next-stop, $easing-func, $easing-args: ()) {
-    $prev-stop-color: nth($prev-stop, 1);
-    $prev-stop-pos:   nth($prev-stop, 2);
-    $next-stop-color: nth($next-stop, 1);
-    $next-stop-pos:   nth($next-stop, 2);
+        $prev-stop-color: list.nth($prev-stop, 1);
+        $prev-stop-pos:   list.nth($prev-stop, 2);
+        $next-stop-color: list.nth($next-stop, 1);
+        $next-stop-pos:   list.nth($next-stop, 2);
 
-    $stops: ();
+        $stops: ();
 
-    @if ((type-of($prev-stop-pos) == number) and (type-of($next-stop-pos) == number) and (unit($prev-stop-pos) == unit($next-stop-pos))) or ($prev-stop-pos == 0) or ($next-stop-pos == 0) {
-        //
-        // The transition color stop positions can be statically calculated.
-        //
+        @if ((meta.type-of($prev-stop-pos) == number) and (meta.type-of($next-stop-pos) == number) and (math.unit($prev-stop-pos) == math.unit($next-stop-pos))) or ($prev-stop-pos == 0) or ($next-stop-pos == 0) {
+                //
+                // The transition color stop positions can be statically calculated.
+                //
 
-        $distance: $next-stop-pos - $prev-stop-pos;
+                $distance: $next-stop-pos - $prev-stop-pos;
 
-        @for $i from 1 through $easing-gradient-steps {
-            $perc:  math.div($i, $easing-gradient-steps);
+                @for $i from 1 through $easing-gradient-steps {
+                        $perc:  math.div($i, $easing-gradient-steps);
 
-            $color: null;
-            $pos:   $prev-stop-pos + $perc * $distance;
-            @if $perc == 1 {
-                $color: $next-stop-color;
-            } @else {
-                $color: mix($next-stop-color, $prev-stop-color, call($easing-func, append($easing-args, $perc)...) * 100%);
-            }
+                        $color: null;
+                        $pos:   $prev-stop-pos + $perc * $distance;
+                        @if $perc == 1 {
+                                $color: $next-stop-color;
+                        } @else {
+                                $color: color.mix($next-stop-color, $prev-stop-color, meta.call($easing-func, list.append($easing-args, $perc)...) * 100%);
+                        }
 
-            $stops: append($stops, $color + ' ' + $pos);
-        }
-    } @else {
-        //
-        // The transition color stop positions have to be dynamically calculated with the calc() function.
-        //
+                        $stops: list.append($stops, $color + ' ' + $pos);
+                }
+        } @else {
+                //
+                // The transition color stop positions have to be dynamically calculated with the calc() function.
+                //
 
-        @if type-of($prev-stop-pos) != number {
-            // must be calc()
-            @if type-of($prev-stop-pos) != calculation {
-                @error 'Invalid color stop position: #{inspect($prev-stop-pos)}';
-            }
+                @if meta.type-of($prev-stop-pos) != number {
+                        // must be calc()
+                        @if meta.type-of($prev-stop-pos) != calculation {
+                                @error 'Invalid color stop position: #{inspect($prev-stop-pos)}';
+                        }
 
-            $prev-stop-pos: meta.calc-args($prev-stop-pos);
-        }
+                        $prev-stop-pos: meta.calc-args($prev-stop-pos);
+                }
 
-        @if type-of($next-stop-pos) != number {
-            // must be calc()
-            @if type-of($next-stop-pos) != calculation {
-                @error 'Invalid color stop position: #{inspect($next-stop-pos)}';
-            }
+                @if meta.type-of($next-stop-pos) != number {
+                        // must be calc()
+                        @if meta.type-of($next-stop-pos) != calculation {
+                                @error 'Invalid color stop position: #{inspect($next-stop-pos)}';
+                        }
 
-            $next-stop-pos: meta.calc-args($next-stop-pos);
-        }
+                        $next-stop-pos: meta.calc-args($next-stop-pos);
+                }
 
-        @for $i from 1 through $easing-gradient-steps {
-            $perc:  math.div($i, $easing-gradient-steps);
+                @for $i from 1 through $easing-gradient-steps {
+                        $perc:  math.div($i, $easing-gradient-steps);
 
-            $color: null;
-            $pos:   null;
-            @if $perc == 1 {
-                $color: $next-stop-color;
-                $pos:   calc(#{$next-stop-pos});
-            } @else {
-                $color: mix($next-stop-color, $prev-stop-color, call($easing-func, append($easing-args, $perc)...) * 100%);
-                $pos:   calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$perc});
-            }
+                        $color: null;
+                        $pos:   null;
+                        @if $perc == 1 {
+                                $color: $next-stop-color;
+                                $pos:   calc(#{$next-stop-pos});
+                        } @else {
+                                $color: color.mix($next-stop-color, $prev-stop-color, meta.call($easing-func, list.append($easing-args, $perc)...) * 100%);
+                                $pos:   calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$perc});
+                        }
 
-            $stops: append($stops, $color + ' ' + $pos);
-        }
-    }
+                        $stops: list.append($stops, $color + ' ' + $pos);
+                }
+        }
 
-    @return $stops;
+        @return $stops;
 }
 
 ///
@@ -401,110 +396,110 @@ $easing-gradient-steps: 10 !default;
 /// @access private
 ///
 @function easing-gradient-steps-stops($prev-stop, $next-stop, $steps, $jump: jump-end) {
-    $prev-stop-color: nth($prev-stop, 1);
-    $prev-stop-pos:   nth($prev-stop, 2);
-    $next-stop-color: nth($next-stop, 1);
-    $next-stop-pos:   nth($next-stop, 2);
+        $prev-stop-color: list.nth($prev-stop, 1);
+        $prev-stop-pos:   list.nth($prev-stop, 2);
+        $next-stop-color: list.nth($next-stop, 1);
+        $next-stop-pos:   list.nth($next-stop, 2);
 
-    $stops: ();
+        $stops: ();
 
-    @if ((type-of($prev-stop-pos) == number) and (type-of($next-stop-pos) == number) and (unit($prev-stop-pos) == unit($next-stop-pos))) or ($prev-stop-pos == 0) or ($next-stop-pos == 0) {
-        //
-        // The transition color stop positions can be statically calculated.
-        //
+        @if ((meta.type-of($prev-stop-pos) == number) and (meta.type-of($next-stop-pos) == number) and (math.unit($prev-stop-pos) == math.unit($next-stop-pos))) or ($prev-stop-pos == 0) or ($next-stop-pos == 0) {
+                //
+                // The transition color stop positions can be statically calculated.
+                //
 
-        $distance: $next-stop-pos - $prev-stop-pos;
+                $distance: $next-stop-pos - $prev-stop-pos;
 
-        @for $i from 1 through $steps {
-            $x1: math.div($i - 1, $steps);
-            $x2: math.div($i, $steps);
-            $y:  null;
+                @for $i from 1 through $steps {
+                        $xx1: math.div($i - 1, $steps);
+                        $xx2: math.div($i, $steps);
+                        $y:  null;
 
-            @if $jump == jump-start {
-                $y: math.div($i, $steps);
-            } @else if $jump == jump-end {
-                $y: math.div($i - 1, $steps);
-            } @else if $jump == jump-both {
-                $y: math.div($i, $steps + 1);
-            } @else if $jump == jump-none {
-                $y: math.div($i - 1, $steps - 1);
-            } @else {
-                @error 'Invalid $jump: #{inspect($jump)}';
-            }
+                        @if $jump == jump-start {
+                                $y: math.div($i, $steps);
+                        } @else if $jump == jump-end {
+                                $y: math.div($i - 1, $steps);
+                        } @else if $jump == jump-both {
+                                $y: math.div($i, $steps + 1);
+                        } @else if $jump == jump-none {
+                                $y: math.div($i - 1, $steps - 1);
+                        } @else {
+                                @error 'Invalid $jump: #{inspect($jump)}';
+                        }
 
-            $color: null;
-            $pos1:  if($x1 == 0, $prev-stop-pos, $prev-stop-pos + $x1 * $distance);
-            $pos2:  if($x2 == 1, $next-stop-pos, $prev-stop-pos + $x2 * $distance);
+                        $color: null;
+                        $pos1:  if($xx1 == 0, $prev-stop-pos, $prev-stop-pos + $xx1 * $distance);
+                        $pos2:  if($xx2 == 1, $next-stop-pos, $prev-stop-pos + $xx2 * $distance);
 
-            @if $y == 0 {
-                $color: $prev-stop-color;
-            } @else if $y == 1 {
-                $color: $next-stop-color;
-            } @else {
-                $color: mix($next-stop-color, $prev-stop-color, $y * 100%);
-            }
+                        @if $y == 0 {
+                                $color: $prev-stop-color;
+                        } @else if $y == 1 {
+                                $color: $next-stop-color;
+                        } @else {
+                                $color: color.mix($next-stop-color, $prev-stop-color, $y * 100%);
+                        }
 
-            $stops: append($stops, $color + ' ' + $pos1);
-            $stops: append($stops, $color + ' ' + $pos2);
-        }
-    } @else {
-        //
-        // The transition color stop positions have to be dynamically calculated with the calc() function.
-        //
+                        $stops: list.append($stops, $color + ' ' + $pos1);
+                        $stops: list.append($stops, $color + ' ' + $pos2);
+                }
+        } @else {
+                //
+                // The transition color stop positions have to be dynamically calculated with the calc() function.
+                //
 
-        @if type-of($prev-stop-pos) != number {
-            // must be calc()
-            @if type-of($prev-stop-pos) != calculation {
-                @error 'Invalid color stop position: #{inspect($prev-stop-pos)}';
-            }
+                @if meta.type-of($prev-stop-pos) != number {
+                        // must be calc()
+                        @if meta.type-of($prev-stop-pos) != calculation {
+                                @error 'Invalid color stop position: #{inspect($prev-stop-pos)}';
+                        }
 
-            $prev-stop-pos: meta.calc-args($prev-stop-pos);
-        }
+                        $prev-stop-pos: meta.calc-args($prev-stop-pos);
+                }
 
-        @if type-of($next-stop-pos) != number {
-            // must be calc()
-            @if type-of($next-stop-pos) != calculation {
-                @error 'Invalid color stop position: #{inspect($next-stop-pos)}';
-            }
+                @if meta.type-of($next-stop-pos) != number {
+                        // must be calc()
+                        @if meta.type-of($next-stop-pos) != calculation {
+                                @error 'Invalid color stop position: #{inspect($next-stop-pos)}';
+                        }
 
-            $next-stop-pos: meta.calc-args($next-stop-pos);
-        }
+                        $next-stop-pos: meta.calc-args($next-stop-pos);
+                }
 
-        @for $i from 1 through $steps {
-            $x1: math.div($i - 1, $steps);
-            $x2: math.div($i, $steps);
-            $y:  null;
+                @for $i from 1 through $steps {
+                        $xx1: math.div($i - 1, $steps);
+                        $xx2: math.div($i, $steps);
+                        $y:  null;
 
-            @if $jump == jump-start {
-                $y: math.div($i, $steps);
-            } @else if $jump == jump-end {
-                $y: math.div($i - 1, $steps);
-            } @else if $jump == jump-both {
-                $y: math.div($i, $steps + 1);
-            } @else if $jump == jump-none {
-                $y: math.div($i - 1, $steps - 1);
-            } @else {
-                @error 'Invalid $jump: #{inspect($jump)}';
-            }
+                        @if $jump == jump-start {
+                                $y: math.div($i, $steps);
+                        } @else if $jump == jump-end {
+                                $y: math.div($i - 1, $steps);
+                        } @else if $jump == jump-both {
+                                $y: math.div($i, $steps + 1);
+                        } @else if $jump == jump-none {
+                                $y: math.div($i - 1, $steps - 1);
+                        } @else {
+                                @error 'Invalid $jump: #{inspect($jump)}';
+                        }
 
-            $color: null;
-            $pos1:  if($x1 == 0, $prev-stop-pos, calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$x1}));
-            $pos2:  if($x2 == 1, $next-stop-pos, calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$x2}));
+                        $color: null;
+                        $pos1:  if($xx1 == 0, $prev-stop-pos, calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$xx1}));
+                        $pos2:  if($xx2 == 1, $next-stop-pos, calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$xx2}));
 
-            @if $y == 0 {
-                $color: $prev-stop-color;
-            } @else if $y == 1 {
-                $color: $next-stop-color;
-            } @else {
-                $color: mix($next-stop-color, $prev-stop-color, $y * 100%);
-            }
+                        @if $y == 0 {
+                                $color: $prev-stop-color;
+                        } @else if $y == 1 {
+                                $color: $next-stop-color;
+                        } @else {
+                                $color: color.mix($next-stop-color, $prev-stop-color, $y * 100%);
+                        }
 
-            $stops: append($stops, $color + ' ' + $pos1);
-            $stops: append($stops, $color + ' ' + $pos2);
-        }
-    }
+                        $stops: list.append($stops, $color + ' ' + $pos1);
+                        $stops: list.append($stops, $color + ' ' + $pos2);
+                }
+        }
 
-    @return $stops;
+        @return $stops;
 }
 
 ///
@@ -513,72 +508,72 @@ $easing-gradient-steps: 10 !default;
 /// @access private
 ///
 @function easing-gradient-interpolate-stop-positions($prev-stop, $stops, $next-stop) {
-    $prev-stop-pos: nth($prev-stop, 2);
-    $next-stop-pos: nth($next-stop, 2);
+        $prev-stop-pos: list.nth($prev-stop, 2);
+        $next-stop-pos: list.nth($next-stop, 2);
 
-    $stops-num: 0;
-    @for $i from 1 through length($stops) {
-        $stop: nth($stops, $i);
-        @if easing-gradient-is-color-stop($stop) {
-            $stops-num: $stops-num + 1;
-        }
-    }
+        $stops-num: 0;
+        @for $i from 1 through list.length($stops) {
+                $stop: list.nth($stops, $i);
+                @if easing-gradient-is-color-stop($stop) {
+                        $stops-num: $stops-num + 1;
+                }
+        }
 
-    $i: 1;
-    $cur-stop-num: 1;
+        $i: 1;
+        $cur-stop-num: 1;
 
-    @if ((type-of($prev-stop-pos) == number) and (type-of($next-stop-pos) == number) and (unit($prev-stop-pos) == unit($next-stop-pos))) or ($prev-stop-pos == 0) or ($next-stop-pos == 0) {
-        //
-        // The color stop positions can be statically calculated.
-        //
+        @if ((meta.type-of($prev-stop-pos) == number) and (meta.type-of($next-stop-pos) == number) and (math.unit($prev-stop-pos) == math.unit($next-stop-pos))) or ($prev-stop-pos == 0) or ($next-stop-pos == 0) {
+                //
+                // The color stop positions can be statically calculated.
+                //
 
-        $distance: $next-stop-pos - $prev-stop-pos;
+                $distance: $next-stop-pos - $prev-stop-pos;
 
-        @for $i from 1 through length($stops) {
-            $stop: nth($stops, $i);
-            @if easing-gradient-is-color-stop($stop) {
-                $pos:   $prev-stop-pos + math.div($distance, $stops-num + 1) * $cur-stop-num;
-                $stops: set-nth($stops, $i, $stop $pos);
+                @for $i from 1 through list.length($stops) {
+                        $stop: list.nth($stops, $i);
+                        @if easing-gradient-is-color-stop($stop) {
+                                $pos:   $prev-stop-pos + math.div($distance, $stops-num + 1) * $cur-stop-num;
+                                $stops: list.set-nth($stops, $i, $stop $pos);
 
-                $cur-stop-num: $cur-stop-num + 1;
-            }
-        }
-    } @else {
-        //
-        // The color stop positions have to be dynamically calculated with the calc() function.
-        //
+                                $cur-stop-num: $cur-stop-num + 1;
+                        }
+                }
+        } @else {
+                //
+                // The color stop positions have to be dynamically calculated with the calc() function.
+                //
 
-        @if type-of($prev-stop-pos) != number {
-            // must be calc()
-            @if type-of($prev-stop-pos) != calculation {
-                @error 'Invalid color stop position: #{inspect($prev-stop-pos)}';
-            }
+                @if meta.type-of($prev-stop-pos) != number {
+                        // must be calc()
+                        @if meta.type-of($prev-stop-pos) != calculation {
+                                @error 'Invalid color stop position: #{inspect($prev-stop-pos)}';
+                        }
 
-            $prev-stop-pos: meta.calc-args($prev-stop-pos);
-        }
+                        $prev-stop-pos: meta.calc-args($prev-stop-pos);
+                }
 
-        @if type-of($next-stop-pos) != number {
-            // must be calc()
-            @if type-of($next-stop-pos) != calculation {
-                @error 'Invalid color stop position: #{inspect($next-stop-pos)}';
-            }
+                @if meta.type-of($next-stop-pos) != number {
+                        // must be calc()
+                        @if meta.type-of($next-stop-pos) != calculation {
+                                @error 'Invalid color stop position: #{inspect($next-stop-pos)}';
+                        }
 
-            $next-stop-pos: meta.calc-args($next-stop-pos);
-        }
+                        $next-stop-pos: meta.calc-args($next-stop-pos);
+                }
 
-        @for $i from 1 through length($stops) {
-            $stop: nth($stops, $i);
-            @if easing-gradient-is-color-stop($stop) {
-                $perc:  math.div($cur-stop-num, $stops-num + 1);
-                $pos:   calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$perc});
-                $stops: set-nth($stops, $i, $stop $pos);
+                @for $i from 1 through list.length($stops) {
+                        $stop: list.nth($stops, $i);
+                        @if easing-gradient-is-color-stop($stop) {
+                                $perc:  math.div($cur-stop-num, $stops-num + 1);
+                                $pos:   calc(#{$prev-stop-pos} + (#{$next-stop-pos} - #{$prev-stop-pos}) * #{$perc});
+                                $stops: list.set-nth($stops, $i, $stop $pos);
 
-                $cur-stop-num: $cur-stop-num + 1;
-            }
-        }
-    }
+                                $cur-stop-num: $cur-stop-num + 1;
+                        }
+                }
+        }
 
-    @return $stops;
+        @return $stops;
 }
 
 ///
@@ -587,7 +582,7 @@ $easing-gradient-steps: 10 !default;
 /// @access private
 ///
 @function easing-gradient-is-color-stop($input) {
-    @return (type-of($input) == color) or easing-gradient-is-positioned-color-stop($input);
+        @return (meta.type-of($input) == color) or easing-gradient-is-positioned-color-stop($input);
 }
 
 ///
@@ -596,5 +591,5 @@ $easing-gradient-steps: 10 !default;
 /// @access private
 ///
 @function easing-gradient-is-positioned-color-stop($input) {
-    @return (type-of($input) == list) and (type-of(nth($input, 1)) == color);
+        @return (meta.type-of($input) == list) and (meta.type-of(list.nth($input, 1)) == color);
 }
diff --git a/src/_harmony.scss b/src/_harmony.scss
index aaab726..c0cb772 100644
--- a/src/_harmony.scss
+++ b/src/_harmony.scss
@@ -8,7 +8,10 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
 @use 'sass:math';
+@use 'sass:meta';
 @use './functions';
 @use './responsive';
 
@@ -26,35 +29,35 @@
 /// @return {number}
 ///
 @function modular-scale($times, $base, $ratio) {
-    @if type-of($base) == number {
-        @return $base * math.pow($ratio, $times);
-    }
+        @if meta.type-of($base) == number {
+                @return $base * math.pow($ratio, $times);
+        }
 
-    $main-base:  nth($base, 1);
-    $norm-bases: ();
+        $main-base:  list.nth($base, 1);
+        $norm-bases: ();
 
-    @each $b in functions.list-slice($base, 2) {
-        @if $b > $main-base {
-            @while $b > $main-base {
-                $b: math.div($b, $ratio);
-            }
-            $b: $b * $ratio;
-        } @else if $b < $main-base {
-            @while $b < $main-base {
-                $b: $b * $ratio;
-            }
-        }
+        @each $b in functions.list-slice($base, 2) {
+                @if $b > $main-base {
+                        @while $b > $main-base {
+                                $b: math.div($b, $ratio);
+                        }
+                        $b: $b * $ratio;
+                } @else if $b < $main-base {
+                        @while $b < $main-base {
+                                $b: $b * $ratio;
+                        }
+                }
 
-        $norm-bases: append($norm-bases, $b);
-    }
+                $norm-bases: list.append($norm-bases, $b);
+        }
 
-    $all-bases: append($norm-bases, $main-base);
-    $all-bases: functions.quicksort($all-bases);
+        $all-bases: list.append($norm-bases, $main-base);
+        $all-bases: functions.quicksort($all-bases);
 
-    $base-index: $times % length($all-bases) + 1;
-    $exp:        math.floor(math.div($times, length($all-bases)));
+        $base-index: $times % list.length($all-bases) + 1;
+        $exp:        math.floor(math.div($times, list.length($all-bases)));
 
-    @return nth($all-bases, $base-index) * math.pow($ratio, $exp);
+        @return list.nth($all-bases, $base-index) * math.pow($ratio, $exp);
 }
 
 ///
@@ -86,15 +89,13 @@
 ///   }
 ///
 @mixin responsive-modular-scale($props, $times, $responsive-map, $fluid: true) {
-    $new-map: ();
+        $new-map: ();
 
-    @each $key, $value in $responsive-map {
-        $new-map: map-merge(
-            $new-map, (
-                $key: modular-scale($times, $value...)
-            )
-        );
-    }
+        @each $key, $value in $responsive-map {
+                $new-map: map.merge($new-map, (
+                        $key: modular-scale($times, $value...)
+                ));
+        }
 
-    @include responsive.property($props, $new-map, $fluid);
+        @include responsive.property($props, $new-map, $fluid);
 }
diff --git a/src/index.scss b/src/_iro-sass.scss
index cc9cda7..d1b8ee3 100644
--- a/src/index.scss
+++ b/src/_iro-sass.scss
@@ -1,9 +1,9 @@
-@forward 'bem' as bem-*;
+@forward 'vars' as vars-*;
+@forward 'functions' as fn-*;
 @forward 'contexts' as ctx-*;
+@forward 'props' as props-*;
+@forward 'bem' as bem-*;
 @forward 'easing' as easing-*;
-@forward 'functions' as fn-*;
 @forward 'gradients' as gradients-*;
-@forward 'harmony' as harmony-*;
-@forward 'props' as props-*;
 @forward 'responsive' as responsive-*;
-@forward 'vars' as vars-*;
+@forward 'harmony' as harmony-*;
diff --git a/src/_props.scss b/src/_props.scss
index 8d84aa1..17e9de7 100644
--- a/src/_props.scss
+++ b/src/_props.scss
@@ -1,423 +1,139 @@
-////
-/// Property trees.
-///
-/// Property trees allow you to organize properties in a tree structure (internally nested maps).
-/// The intended use is to store all your properties at the beginning and for the rest of the
-/// stylesheet you just get them.
-///
-/// @group Property trees
-///
-/// @access public
-////
-
+@use 'sass:list';
 @use 'sass:map';
-@use './functions';
-@use './contexts';
-
-///
-/// The maximum depth of resolved iro-prop-ref() references.
-///
-/// @type number
-///
-$native-assign-max-depth: 2 !default;
-
-///
-/// Indicate if property names must start with two dashes (--).
-/// This is required if property trees are also used for native CSS custom properties.
-///
-/// @type bool
-///
-$enforce-double-dashes: true !default;
-
-///
-/// Default tree name to use if no name is specified.
-///
-/// @type string
-///
-$default-tree: 'default' !default;
-
-///
-/// List of all created property trees.
-///
-/// @type list
-///
-/// @access private
-///
-$trees: ();
-
-///
-/// Default context name used for the namespace context.
-///
-/// @type string
-///
-$namespace-context-id: 'namespace' !default;
-
-///
-/// Declare a namespace, meaning that all variables declared and accessed.
-///
-/// @param {string} $name - Name of the namespace
-///
-@mixin namespace($name) {
-    $key: '--#{$name}';
-
-    $ns-key: get-ns-key();
-
-    @if $ns-key != null {
-        $key: append($ns-key, $key);
-    } @else {
-        $key: ($key);
-    }
-
-    @include contexts.push($namespace-context-id, 'namespace', (
-        'name': $name,
-        'key':  $key
-    ));
-
-    @content;
-
-    @include contexts.pop($namespace-context-id);
-}
+@use 'sass:meta';
 
-///
-/// Get the current namespace name.
-///
-@function namespace() {
-    $noop: contexts.assert-stack-must-contain($namespace-context-id, 'namespace');
-
-    $data: nth(contexts.get($namespace-context-id, 'namespace'), 2);
-    $name: map-get($data, 'name');
-
-    @return $name;
+@function is-prop-ref($value) {
+        @if meta.type-of($value) != 'list' {
+                @return false;
+        }
+        @if list.length($value) != 4 {
+                @return false;
+        }
+        @if list.nth($value, 1) != 'prop-ref' {
+                @return false;
+        }
+        @return true;
 }
 
-/// 
-/// Save a property tree. If a tree with the sane name already exists, the trees
-/// will be merged.
-///
-/// @param {map}    $map                             - Map containing properties
-/// @param {string} $tree  [$default-tree] - ID the map is saved as
-/// @param {bool}   $merge [true]                    - If a tree named $tree already exists and this value is set to true, they will be merged. Otherwise an error will be emitted.
-///
-@mixin store($map, $tree: $default-tree, $merge: true, $global: false) {
-    $noop: store($map, $tree, $merge, $global);
+@function def($name, $value: (), $metadata: ()) {
+        @return ('prop-ref' $name $value $metadata);
 }
 
-/// 
-/// Save a property tree.
-///
-/// @param {map}    $map                             - Map containing properties
-/// @param {string} $tree  [$default-tree] - ID the map is saved as
-/// @param {bool}   $merge [true]                    - If a tree named $tree already exists and this value is set to true, they will be merged. Otherwise an error will be emitted.
-///
-@function store($map, $tree: $default-tree, $merge: true, $global: false) {
-    $prop-map: null;
-
-    @if $enforce-double-dashes {
-        @if not validate($map) {
-            @error 'Property tree keys must start with two dashes (--). If you don\'t use property trees for native CSS custom properties, set $enforce-double-dashes to false.';
-        }
-    }
-
-    @if not $global {
-        $ns-key: get-ns-key();
-
-        @if $ns-key != null {
-            $map: ($ns-key: $map);
-        }
-    }
-
-    @if map-has-key($trees, $tree) {
-        @if $merge {
-            $map: map.deep-merge(map-get($trees, $tree), $map);
-        } @else {
-            @error 'Property tree #{inspect($tree)} does already exist.';
-        }
-    }
-
-    $trees: map-merge($trees, ($tree: $map)) !global;
+@function merge($ref, $value) {
+        @if not is-prop-ref($ref) {
+                @return $ref;
+        }
 
-    @return null;
+        $v:   list.nth($ref, 3);
+        $ref: list.set-nth($ref, 3, map.deep-merge($v, $value));
+        @return $ref;
 }
 
-/// 
-/// Delete a property tree.
-///
-/// @param {string} $tree [$default-tree] - ID of the tree to be deleted
-///
-@mixin clear($tree: $default-tree) {
-    $noop: clear($tree);
+@function get-deep($name, $value, $key: null, $keys...) {
+        @if is-prop-ref($value) {
+                @return get($value, $key, $keys);
+        }
+        @if meta.type-of($value) == 'map' and $key != null {
+                @if meta.type-of($key) != 'string' {
+                        @error 'Expected string, got #{$key}';
+                }
+                @return get-deep(#{$name}#{$key}, map.get($value, $key), $keys...);
+        }
+        @return $name $value;
 }
 
-/// 
-/// Delete a property tree.
-///
-/// @param {string} $tree [$default-tree] - ID of the tree to be deleted
-///
-/// @throw If the property tree does not exist
-///
-@function clear($tree: $default-tree) {
-    @if not map-has-key($trees, $tree) {
-        @error 'Property tree "#{inspect($tree)}" does not exist.';
-    }
-
-    $trees: map-remove($trees, $tree) !global;
-
-    @return null;
-}
-
-/// 
-/// Access a whole property or a subsection (i.e. value) of it.
-///
-/// @param {string | list} $key     [null]                    - Key of the property to read. If this is a list of keys, the map will be traversed in that order.
-/// @param {string}        $tree    [$default-tree] - ID of the property tree to use
-/// @param {any}           $default [null]                    - Default value to return of no match was found. If null, this function will throw an error instead.
-///
-/// @return {any} Value assigned to property or $default
-///
-/// @throw If there was no match for $key and $default is null
-///
-@function get-static($key: (), $tree: $default-tree, $default: null, $global: false) {
-    @if not map-has-key($trees, $tree) {
-        @error 'Unknown tree "#{$tree}".';
-    }
-
-    $result: map-get($trees, $tree);
-
-    @if not $global {
-        $ns-key: get-ns-key();
+@function map-to-vars($name, $map) {
+        @if meta.type-of($map) != 'map' {
+                @if meta.type-of($name) != 'string' {
+                        @error 'Expected variable name, got #{$name} instead';
+                }
+                @return var($name);
+        }
 
-        @if $ns-key != null {
-            $orig-key: $key;
-            $key:      $ns-key;
+        $out: ();
 
-            @if type-of($orig-key) == list {
-                @each $subkey in $orig-key {
-                    $key: append($key, $subkey);
-                }
-            } @else {
-                $key: append($key, $orig-key);
-            }
-        }
-    }
+        @each $key, $value in $map {
+                $out: map.set($out, $key, map-to-vars(#{$name}#{$key}, $value));
+        }
 
-    @if type-of($key) == list {
-        $stop: false;
-
-        @each $k in $key {
-            @if not $stop and map-has-key($result, $k) {
-                $result: map-get($result, $k);
-
-                @if type-of($result) == list and nth($result, 1) == 'iro-prop-ref' {
-                    @if length($result) == 2 {
-                        $result: get-static($tree: nth($result, 2), $global: true);
-                    } @else {
-                        $result: get-static(nth($result, 3), nth($result, 2), $global: true);
-                    }
-                }
-            } @else {
-                $stop: true;
-            }
-        }
-
-        @if $stop {
-            $result: null;
-        }
-    } @else {
-        $result: map-get($result, $key);
-
-        @if type-of($result) == list and nth($result, 1) == 'iro-prop-ref' {
-            @if length($result) == 2 {
-                $result: get-static($tree: nth($result, 2), $global: true);
-            } @else {
-                $result: get-static(nth($result, 3), nth($result, 2), $global: true);
-            }
-        }
-    }
-
-    @if $result == null {
-        @if $default == null {
-            @error '"#{$key}" is null.';
-        } @else {
-            @return $default;
-        }
-    }
-
-    @return $result;
+        @return $out;
 }
 
-/// 
-/// Generate a var() function call to get native CSS custom property.
-///
-/// @param {string | list} $key            - Key of the property to read. If this is a list of keys, the map will be traversed in that order.
-/// @param {string | null} $tree    [null] - Optional tree to check if the property actually exists.
-/// @param {any}           $default [null] - Default value to return of no match was found.
-///
-/// @return {string} var()
-///
-@function get($key, $tree: $default-tree, $default: null, $global: false) {
-    @if $tree != null {
-        $noop: get-static($key, $tree, $default, $global);
-    }
-
-    @if not $global {
-        $ns-key: get-ns-key();
+@function get($ref, $key: null, $keys...) {
+        @if not is-prop-ref($ref) {
+                @return $ref;
+        }
 
-        @if $ns-key != null {
-            $orig-key: $key;
-            $key:      $ns-key;
+        $name:  list.nth($ref, 2);
+        $value: get(list.nth($ref, 3));
 
-            @if type-of($orig-key) == list {
-                @each $subkey in $orig-key {
-                    $key: append($key, $subkey);
-                }
-            } @else {
-                $key: append($key, $orig-key);
-            }
-        }
-    }
+        @if meta.type-of($value) == 'map' {
+                $res:   get-deep($name, $value, $key, $keys...);
+                $name:  list.nth($res, 1);
+                $value: list.nth($res, 2);
+        } @else if meta.type-of($value) == 'list' {
+                $i: 1;
+                @each $item in $value {
+                        $value: list.set-nth($value, $i, get($item));
+                        $i: $i + 1;
+                }
+        }
 
-    $native-var: '';
-
-    @if type-of($key) == list {
-        @each $subkey in $key {
-            $native-var: $native-var + $subkey;
-        }
-    } @else {
-        $native-var: $key;
-    }
-
-    @if $default == null {
-        @return var(#{$native-var});
-    } @else {
-        @return var(#{$native-var}, #{$default});
-    }
+        @return map-to-vars($name, $value);
 }
 
-/// 
-/// Generate assignments for native CSS custom properties with the values from the specified tree.
-///
-/// @param {string} $tree [$default-tree] - ID of the property tree to use
-/// @param {string} $root [()]                      - Sub-tree to use for assignment
-///
-@mixin assign($tree: $default-tree, $root: (), $skip: (), $prefix: '', $global: false) {
-    $map: get-static($root, $tree, $global: $global);
-    $map: map-remove($map, $skip...);
-
-    @if type-of($prefix) == list {
-        $prefix: functions.str-implode($prefix);
-    }
-
-    @if not $global {
-        $ns-key: get-ns-key();
-
-        @if $ns-key != null {
-            $prefix: $prefix + functions.str-implode($ns-key);
-        }
-    }
-
-    @include assign-internal($map, $prefix);
+@mixin materialize-helper($name, $value) {
+        @if meta.type-of($value) == 'map' {
+                @each $key, $value in $value {
+                        @include materialize-helper(#{$name}#{$key}, $value);
+                }
+        } @else {
+                #{$name}: #{$value};
+        }
 }
 
-///
-/// @access private
-///
-@mixin assign-internal($map, $prefix: '', $ref-depth: $native-assign-max-depth) {
-    @each $key, $value in $map {
-        $rd: $ref-depth;
-        @if type-of($value) == list and length($value) > 0 and nth($value, 1) == 'iro-prop-ref' {
-            @if $ref-depth != 0 {
-                $rd: $rd - 1;
-                @if length($value) == 2 {
-                    $value: get-static($tree: nth($value, 2));
-                } @else {
-                    $value: get-static(nth($value, 3), nth($value, 2));
-                }
-            } @else {
-                $value: null;
-            }
-        }
-        @if type-of($value) != map and $value != () {
-            #{$prefix + $key}: #{$value};
-        } @else {
-            @include assign-internal($value, $prefix + $key, $rd);
-        }
-    }
-}
-
-/// 
-/// Validate property names.
-///
-/// @access private
-///
-@function validate($map) {
-    @each $key, $value in $map {
-        @if str-index($key, '--') != 1 {
-            @return false;
-        }
-
-        @if type-of($value) == map {
-            @if not validate($value) {
-                @return false;
-            }
-        }
-    }
-
-    @return true;
-}
-
-/// 
-/// Generate a reference to another tree. Dereferencing is lazy, so you may specify a tree that hasn't been created yet.
-///
-/// @param {string}        $tree [$default-tree] - ID of the property tree to use
-/// @param {string | list} $key                            - Key of the property to read. If this is a list of keys, the map will be traversed in that order.
-///
-/// @return {list} A special list that let's Ignis know that this is a lazy value.
-///
-/// @throw If there was no match for $key and $default is null
-///
-@function ref($tree: $default-tree, $key: null, $global: false) {
-    @if not $global {
-        $ns-key: get-ns-key();
+@mixin materialize($ref, $match-meta: ()) {
+        @if is-prop-ref($ref) {
+                $name:  list.nth($ref, 2);
+                $value: get(list.nth($ref, 3));
+                $meta:  get(list.nth($ref, 4));
 
-        @if $ns-key != null {
-            $orig-key: $key;
-            $key:      $ns-key;
+                $match: true;
+                @if meta.type-of($match-meta) == 'list' {
+                        @each $item in $match-meta {
+                                $match: $match and list.index($meta, $item) != null;
+                        }
+                } @else if $match-meta == null and list.length($meta) == 0 {
+                        $match: true;
+                } @else {
+                        $match: list.index($meta, $match-meta) != null;
+                }
 
-            @if $orig-key != null {
-                @if type-of($orig-key) == list {
-                    @each $subkey in $orig-key {
-                        $key: append($key, $subkey);
-                    }
-                } @else {
-                    $key: append($key, $orig-key);
-                }
-            }
-        }
-    }
+                @if $match {
+                        @include materialize-helper($name, $value);
+                }
+        } @else if meta.type-of($ref) == 'list' {
+                @each $r in $ref {
+                        @if is-prop-ref($r) {
+                                $name:  list.nth($r, 2);
+                                $value: get(list.nth($r, 3));
+                                $meta:  get(list.nth($r, 4));
 
-    @if $key == null {
-        @return ('iro-prop-ref' $tree);
-    } @else {
-        @return ('iro-prop-ref' $tree $key);
-    }
+                                $match: true;
+                                @if meta.type-of($match-meta) == 'list' {
+                                        @each $item in $match-meta {
+                                                $match: $match and list.index($meta, $item) != null;
+                                        }
+                                } @else if $match-meta == null and list.length($meta) == 0 {
+                                        $match: true;
+                                } @else {
+                                        $match: list.index($meta, $match-meta) != null;
+                                }
+        
+                                @if $match {
+                                        @include materialize-helper($name, $value);
+                                }
+                        }
+                }
+        }
 }
-
-/// 
-/// Get the current namespace key.
-///
-/// @access private
-///
-@function get-ns-key() {
-    $ctx: contexts.get($namespace-context-id, 'namespace');
-
-    @if $ctx == null {
-        @return null;
-    }
-
-    $data: nth($ctx, 2);
-    $key:  map-get($data, 'key');
-
-    @return $key;
-}
-
-@include contexts.create($namespace-context-id);
diff --git a/src/_responsive.scss b/src/_responsive.scss
index 4d98638..f613a6d 100644
--- a/src/_responsive.scss
+++ b/src/_responsive.scss
@@ -17,6 +17,11 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:math';
+@use 'sass:meta';
+@use 'sass:string';
 @use './functions';
 @use './contexts';
 
@@ -99,15 +104,15 @@ $named-viewports: () !default;
 ///   }
 ///
 @mixin property($props, $responsive-map, $fluid: true, $vertical: false) {
-    @include env(map-keys($responsive-map), $fluid, $vertical) {
-        @if type-of($props) == list {
-            @each $prop in $props {
-                #{$prop}: set(map-values($responsive-map));
-            }
-        } @else {
-            #{$props}: set(map-values($responsive-map));
-        }
-    }
+        @include env(map.keys($responsive-map), $fluid, $vertical) {
+                @if meta.type-of($props) == list {
+                        @each $prop in $props {
+                                #{$prop}: set(map.values($responsive-map));
+                        }
+                } @else {
+                        #{$props}: set(map.values($responsive-map));
+                }
+        }
 }
 
 /// 
@@ -150,153 +155,153 @@ $named-viewports: () !default;
 ///   }
 ///
 @mixin env($viewports, $fluid: true, $vertical: false) {
-    @if length($viewports) <= 1 {
-        @error '$viewports must contain at least two viewports.';
-    }
+        @if list.length($viewports) <= 1 {
+                @error '$viewports must contain at least two viewports.';
+        }
 
-    $new-viewports: ();
+        $new-viewports: ();
 
-    @each $viewport in $viewports {
-        @if map-has-key($named-viewports, $viewport) {
-            $viewport: map-get($named-viewports, $viewport);
-        }
+        @each $viewport in $viewports {
+                @if map.has-key($named-viewports, $viewport) {
+                        $viewport: map.get($named-viewports, $viewport);
+                }
 
-        @if (type-of($viewport) != number) or unitless($viewport) {
-            @error '$viewports contains invalid viewports.';
-        }
+                @if (meta.type-of($viewport) != number) or math.is-unitless($viewport) {
+                        @error '$viewports contains invalid viewports.';
+                }
 
-        $new-viewports: append($new-viewports, $viewport);
-    }
+                $new-viewports: list.append($new-viewports, $viewport);
+        }
 
-    $viewports: functions.quicksort($new-viewports);
+        $viewports: functions.quicksort($new-viewports);
 
-    @if $new-viewports != $viewports {
-        @error '$viewports was not sorted in ascending order.';
-    }
+        @if $new-viewports != $viewports {
+                @error '$viewports was not sorted in ascending order.';
+        }
 
-    @if $fluid {
-        $first-vp: nth($viewports, 1);
-        $last-vp:  nth($viewports, length($viewports));
+        @if $fluid {
+                $first-vp: list.nth($viewports, 1);
+                $last-vp:  list.nth($viewports, list.length($viewports));
 
-        @include contexts.push($context-id, 'env', (
-            'viewports': $viewports,
-            'mode':      set,
-            'index':     1,
-            'fluid':     $fluid,
-            'vertical':  $vertical,
-        ));
+                @include contexts.push($context-id, 'env', (
+                        'viewports': $viewports,
+                        'mode':      set,
+                        'index':     1,
+                        'fluid':     $fluid,
+                        'vertical':  $vertical,
+                ));
 
-        @content;
+                @content;
 
-        @include contexts.pop($context-id);
+                @include contexts.pop($context-id);
 
-        @for $i from 1 to length($viewports) {
-            $prev-vp: nth($viewports, $i);
-            $next-vp: nth($viewports, $i + 1);
+                @for $i from 1 to list.length($viewports) {
+                        $prev-vp: list.nth($viewports, $i);
+                        $next-vp: list.nth($viewports, $i + 1);
 
-            @if not $vertical {
-                @media (min-width: $prev-vp) and (max-width: $next-vp) {
-                    @include contexts.push($context-id, 'env', (
-                        'viewports': $viewports,
-                        'mode':      transition,
-                        'index':     $i,
-                        'fluid':     $fluid,
-                        'vertical':  $vertical,
-                    ));
+                        @if not $vertical {
+                                @media (min-width: $prev-vp) and (max-width: $next-vp) {
+                                        @include contexts.push($context-id, 'env', (
+                                                'viewports': $viewports,
+                                                'mode':      transition,
+                                                'index':     $i,
+                                                'fluid':     $fluid,
+                                                'vertical':  $vertical,
+                                        ));
 
-                    @content;
+                                        @content;
 
-                    @include contexts.pop($context-id);
-                }
-            } @else {
-                @media (min-height: $prev-vp) and (max-height: $next-vp) {
-                    @include contexts.push($context-id, 'env', (
-                        'viewports': $viewports,
-                        'mode':      transition,
-                        'index':     $i,
-                        'fluid':     $fluid,
-                        'vertical':  $vertical,
-                    ));
+                                        @include contexts.pop($context-id);
+                                }
+                        } @else {
+                                @media (min-height: $prev-vp) and (max-height: $next-vp) {
+                                        @include contexts.push($context-id, 'env', (
+                                                'viewports': $viewports,
+                                                'mode':      transition,
+                                                'index':     $i,
+                                                'fluid':     $fluid,
+                                                'vertical':  $vertical,
+                                        ));
 
-                    @content;
+                                        @content;
 
-                    @include contexts.pop($context-id);
-                }
-            }
-        }
+                                        @include contexts.pop($context-id);
+                                }
+                        }
+                }
 
-        @if not $vertical {
-            @media (min-width: $last-vp) {
-                @include contexts.push($context-id, 'env', (
-                    'viewports': $viewports,
-                    'mode':      set,
-                    'index':     length($viewports),
-                    'fluid':     $fluid,
-                    'vertical':  $vertical,
-                ));
+                @if not $vertical {
+                        @media (min-width: $last-vp) {
+                                @include contexts.push($context-id, 'env', (
+                                        'viewports': $viewports,
+                                        'mode':      set,
+                                        'index':     list.length($viewports),
+                                        'fluid':     $fluid,
+                                        'vertical':  $vertical,
+                                ));
 
-                @content;
+                                @content;
 
-                @include contexts.pop($context-id);
-            }
-        } @else {
-            @media (min-height: $last-vp) {
-                @include contexts.push($context-id, 'env', (
-                    'viewports': $viewports,
-                    'mode':      set,
-                    'index':     length($viewports),
-                    'fluid':     $fluid,
-                    'vertical':  $vertical,
-                ));
+                                @include contexts.pop($context-id);
+                        }
+                } @else {
+                        @media (min-height: $last-vp) {
+                                @include contexts.push($context-id, 'env', (
+                                        'viewports': $viewports,
+                                        'mode':      set,
+                                        'index':     list.length($viewports),
+                                        'fluid':     $fluid,
+                                        'vertical':  $vertical,
+                                ));
 
-                @content;
+                                @content;
 
-                @include contexts.pop($context-id);
-            }
-        }
-    } @else {
-        @include contexts.push($context-id, 'env', (
-            'viewports': $viewports,
-            'mode':      set,
-            'index':     1,
-            'fluid':     $fluid,
-            'vertical':  $vertical,
-        ));
+                                @include contexts.pop($context-id);
+                        }
+                }
+        } @else {
+                @include contexts.push($context-id, 'env', (
+                        'viewports': $viewports,
+                        'mode':      set,
+                        'index':     1,
+                        'fluid':     $fluid,
+                        'vertical':  $vertical,
+                ));
 
-        @content;
+                @content;
 
-        @include contexts.pop($context-id);
+                @include contexts.pop($context-id);
 
-        @for $i from 2 through length($viewports) {
-            $vp: nth($viewports, $i);
+                @for $i from 2 through list.length($viewports) {
+                        $vp: list.nth($viewports, $i);
 
-            @if not $vertical {
-                @media (min-width: $vp) {
-                    @include contexts.push($context-id, 'env', (
-                        'viewports': $viewports,
-                        'mode':      set,
-                        'index':     $i
-                    ));
+                        @if not $vertical {
+                                @media (min-width: $vp) {
+                                        @include contexts.push($context-id, 'env', (
+                                                'viewports': $viewports,
+                                                'mode':      set,
+                                                'index':     $i
+                                        ));
 
-                    @content;
+                                        @content;
 
-                    @include contexts.pop($context-id);
-                }
-            } @else {
-                @media (min-height: $vp) {
-                    @include contexts.push($context-id, 'env', (
-                        'viewports': $viewports,
-                        'mode':      set,
-                        'index':     $i
-                    ));
+                                        @include contexts.pop($context-id);
+                                }
+                        } @else {
+                                @media (min-height: $vp) {
+                                        @include contexts.push($context-id, 'env', (
+                                                'viewports': $viewports,
+                                                'mode':      set,
+                                                'index':     $i
+                                        ));
 
-                    @content;
+                                        @content;
 
-                    @include contexts.pop($context-id);
-                }
-            }
-        }
-    }
+                                        @include contexts.pop($context-id);
+                                }
+                        }
+                }
+        }
 }
 
 ///
@@ -307,29 +312,29 @@ $named-viewports: () !default;
 /// @return {number|string}
 ///
 @function set($values, $without-calc: false) {
-    $noop: contexts.assert-stack-must-contain($context-id, 'env');
+        $noop: contexts.assert-stack-must-contain($context-id, 'env');
 
-    $data:      nth(contexts.get($context-id, 'env'), 2);
-    $viewports: map-get($data, 'viewports');
-    $mode:      map-get($data, 'mode');
-    $fluid:     map-get($data, 'fluid');
-    $vertical:  map-get($data, 'vertical');
+        $data:      list.nth(contexts.get($context-id, 'env'), 2);
+        $viewports: map.get($data, 'viewports');
+        $mode:      map.get($data, 'mode');
+        $fluid:     map.get($data, 'fluid');
+        $vertical:  map.get($data, 'vertical');
 
-    @if length($values) != length($viewports) {
-        @error '$values must contain the same number of items as the responsive environment\'s $viewports.';
-    }
+        @if list.length($values) != list.length($viewports) {
+                @error '$values must contain the same number of items as the responsive environment\'s $viewports.';
+        }
 
-    @if $mode == set {
-        @return nth($values, map-get($data, 'index'));
-    } @else {
-        $index:      map-get($data, 'index');
-        $prev-vp:    nth($viewports, $index);
-        $next-vp:    nth($viewports, $index + 1);
-        $prev-value: nth($values, $index);
-        $next-value: nth($values, $index + 1);
+        @if $mode == set {
+                @return list.nth($values, map.get($data, 'index'));
+        } @else {
+                $index:      map.get($data, 'index');
+                $prev-vp:    list.nth($viewports, $index);
+                $next-vp:    list.nth($viewports, $index + 1);
+                $prev-value: list.nth($values, $index);
+                $next-value: list.nth($values, $index + 1);
 
-        @return fluid-calc($prev-value, $next-value, $prev-vp, $next-vp, $vertical, $without-calc);
-    }
+                @return fluid-calc($prev-value, $next-value, $prev-vp, $next-vp, $vertical, $without-calc);
+        }
 }
 
 /// 
@@ -345,62 +350,62 @@ $named-viewports: () !default;
 /// @access private
 ///
 @function fluid-calc($min-value, $max-value, $min-viewport, $max-viewport, $vertical: false, $without-calc: false) {
-    $value-unit:        unit($min-value);
-    $max-value-unit:    unit($max-value);
-    $viewport-unit:     unit($min-viewport);
-    $max-viewport-unit: unit($max-viewport);
+        $value-unit:        math.unit($min-value);
+        $max-value-unit:    math.unit($max-value);
+        $viewport-unit:     math.unit($min-viewport);
+        $max-viewport-unit: math.unit($max-viewport);
 
-    @if $min-value == 0 {
-        $value-unit: $max-value-unit;
-    }
-    @if $max-value == 0 {
-        $max-value-unit: $value-unit;
-    }
-    @if $min-viewport == 0 {
-        $viewport-unit: $max-viewport-unit;
-    }
-    @if $max-viewport == 0 {
-        $max-viewport-unit: $viewport-unit;
-    }
+        @if $min-value == 0 {
+                $value-unit: $max-value-unit;
+        }
+        @if $max-value == 0 {
+                $max-value-unit: $value-unit;
+        }
+        @if $min-viewport == 0 {
+                $viewport-unit: $max-viewport-unit;
+        }
+        @if $max-viewport == 0 {
+                $max-viewport-unit: $viewport-unit;
+        }
 
-    @if ($value-unit != $max-value-unit) or ($viewport-unit != $max-viewport-unit) {
-        @error 'Units of $min-value and $max-value, $min-viewport and $max-viewport must match.';
-    }
+        @if ($value-unit != $max-value-unit) or ($viewport-unit != $max-viewport-unit) {
+                @error 'Units of $min-value and $max-value, $min-viewport and $max-viewport must match.';
+        }
 
-    @if ($value-unit == rem) and ($viewport-unit == px) {
-        $min-viewport:  functions.px-to-rem($min-viewport);
-        $max-viewport:  functions.px-to-rem($max-viewport);
-        $viewport-unit: rem;
-    } @else if ($value-unit == px) and ($viewport-unit == rem) {
-        $min-value:  functions.px-to-rem($min-value);
-        $max-value:  functions.px-to-rem($max-value);
-        $value-unit: rem;
-    }
+        @if ($value-unit == rem) and ($viewport-unit == px) {
+                $min-viewport:  functions.px-to-rem($min-viewport);
+                $max-viewport:  functions.px-to-rem($max-viewport);
+                $viewport-unit: rem;
+        } @else if ($value-unit == px) and ($viewport-unit == rem) {
+                $min-value:  functions.px-to-rem($min-value);
+                $max-value:  functions.px-to-rem($max-value);
+                $value-unit: rem;
+        }
 
-    @if $value-unit != $viewport-unit {
-        @error 'This combination of units is not supported.';
-    }
+        @if $value-unit != $viewport-unit {
+                @error 'This combination of units is not supported.';
+        }
 
-    $value-diff:    functions.strip-unit($max-value - $min-value);
-    $viewport-diff: functions.strip-unit($max-viewport - $min-viewport);
+        $value-diff:    functions.strip-unit($max-value - $min-value);
+        $viewport-diff: functions.strip-unit($max-viewport - $min-viewport);
 
-    $calc: '';
+        $calc: '';
 
-    @if $min-value != 0 {
-        $calc: '#{$min-value} + ';
-    }
+        @if $min-value != 0 {
+                $calc: '#{$min-value} + ';
+        }
 
-    @if not $vertical {
-        $calc: unquote('#{$calc}#{$value-diff} * (100vw - #{$min-viewport}) / #{$viewport-diff}');
-    } @else {
-        $calc: unquote('#{$calc}#{$value-diff} * (100vh - #{$min-viewport}) / #{$viewport-diff}');
-    }
+        @if not $vertical {
+                $calc: string.unquote('#{$calc}#{$value-diff} * (100vw - #{$min-viewport}) / #{$viewport-diff}');
+        } @else {
+                $calc: string.unquote('#{$calc}#{$value-diff} * (100vh - #{$min-viewport}) / #{$viewport-diff}');
+        }
 
-    @if $without-calc {
-        @return $calc;
-    } @else {
-        @return calc(#{$calc});
-    }
+        @if $without-calc {
+                @return $calc;
+        } @else {
+                @return calc(#{$calc});
+        }
 }
 
 @include contexts.create($context-id);
diff --git a/src/bem/_block.scss b/src/bem/_block.scss
index 49af04b..a4b2a47 100644
--- a/src/bem/_block.scss
+++ b/src/bem/_block.scss
@@ -4,6 +4,10 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:meta';
+@use 'sass:selector';
 @use './validators';
 @use './vars';
 @use './functions' as bemfunctions;
@@ -37,28 +41,34 @@
 ///   }
 ///
 @mixin block($name, $type: null) {
-    $result:   block($name, $type);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   block($name, $type);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'block',
-        (name: $name, type: $type),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'block',
+                (name: $name, type: $type),
+                $selector,
+                $context
+        );
 
-    @if $type != null {
-        vars.$blocks: append(vars.$blocks, $name + '_' + $type);
-    } @else {
-        vars.$blocks: append(vars.$blocks, $name);
-    }
+        @if $type != null {
+                vars.$blocks: list.append(vars.$blocks, $name + '_' + $type);
+        } @else {
+                vars.$blocks: list.append(vars.$blocks, $name);
+        }
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @if $type != null {
+                        @layer #{$type} {
+                                @content;
+                        }
+                } @else {
+                        @content;
+                }
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -69,47 +79,47 @@
 /// @see {mixin} block
 ///
 @function block($name, $type: null) {
-    //
-    // Possible outcomes:
-    //   - ({b,e,m,s}) block
-    //
+        //
+        // Possible outcomes:
+        //   - ({b,e,m,s}) block
+        //
 
-    $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
 
-    $selector:      null;
-    $base-selector: null;
+        $selector:      null;
+        $base-selector: null;
 
-    @if $type != null {
-        $namespace: map-get(vars.$namespaces, $type);
+        @if $type != null {
+                $namespace: map.get(vars.$namespaces, $type);
 
-        @if not $namespace {
-            @error '"#{$type}" is not a valid type.';
-        }
+                @if not $namespace {
+                        @error '"#{$type}" is not a valid type.';
+                }
 
-        $base-selector: selector-parse('.' + $namespace + '-' + $name);
+                $base-selector: selector.parse('.' + $namespace + '-' + $name);
 
-        @if $type != 'theme' or & {
-            $selector: $base-selector;
-        } @else if not & {
-            $selector: bemfunctions.theme-selector($name);
-        }
-    } @else {
-        $base-selector: selector-parse('.' + $name);
-        $selector:      $base-selector;
-    }
+                @if $type != 'theme' or & {
+                        $selector: $base-selector;
+                } @else if not & {
+                        $selector: bemfunctions.theme-selector($name);
+                }
+        } @else {
+                $base-selector: selector.parse('.' + $name);
+                $selector:      $base-selector;
+        }
 
-    @if & {
-        $selector: selector-nest(&, $selector);
-    }
+        @if & {
+                $selector: selector.nest(&, $selector);
+        }
 
-    $context: 'block', (
-        'name':          $name,
-        'type':          $type,
-        'selector':      $selector,
-        'base-selector': $base-selector
-    );
+        $context: 'block', (
+                'name':          $name,
+                'type':          $type,
+                'selector':      $selector,
+                'base-selector': $base-selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
 
 /// 
@@ -120,9 +130,9 @@
 /// @content
 ///
 @mixin object($name) {
-    @include block($name, 'object') {
-        @content;
-    }
+        @include block($name, 'object') {
+                @content;
+        }
 }
 
 ///
@@ -133,7 +143,7 @@
 /// @see {mixin} object
 ///
 @function object($name) {
-    @return block($name, 'object');
+        @return block($name, 'object');
 }
 
 /// 
@@ -144,9 +154,9 @@
 /// @content
 ///
 @mixin component($name) {
-    @include block($name, 'component') {
-        @content;
-    }
+        @include block($name, 'component') {
+                @content;
+        }
 }
 
 ///
@@ -157,7 +167,7 @@
 /// @see {mixin} component
 ///
 @function component($name) {
-    @return block($name, 'component');
+        @return block($name, 'component');
 }
 
 /// 
@@ -168,9 +178,9 @@
 /// @content
 ///
 @mixin layout($name) {
-    @include block($name, 'layout') {
-        @content;
-    }
+        @include block($name, 'layout') {
+                @content;
+        }
 }
 
 ///
@@ -181,7 +191,7 @@
 /// @see {mixin} layout
 ///
 @function layout($name) {
-    @return block($name, 'layout');
+        @return block($name, 'layout');
 }
 
 /// 
@@ -192,9 +202,9 @@
 /// @content
 ///
 @mixin utility($name) {
-    @include block($name, 'utility') {
-        @content;
-    }
+        @include block($name, 'utility') {
+                @content;
+        }
 }
 
 ///
@@ -205,7 +215,7 @@
 /// @see {mixin} utility
 ///
 @function utility($name) {
-    @return block($name, 'utility');
+        @return block($name, 'utility');
 }
 
 /// 
@@ -216,9 +226,9 @@
 /// @content
 ///
 @mixin scope($name) {
-    @include block($name, 'scope') {
-        @content;
-    }
+        @include block($name, 'scope') {
+                @content;
+        }
 }
 
 ///
@@ -229,7 +239,7 @@
 /// @see {mixin} scope
 ///
 @function scope($name) {
-    @return block($name, 'scope');
+        @return block($name, 'scope');
 }
 
 /// 
@@ -240,9 +250,9 @@
 /// @content
 ///
 @mixin theme($name) {
-    @include block($name, 'theme') {
-        @content;
-    }
+        @include block($name, 'theme') {
+                @content;
+        }
 }
 
 ///
@@ -253,7 +263,7 @@
 /// @see {mixin} theme
 ///
 @function theme($name) {
-    @return block($name, 'theme');
+        @return block($name, 'theme');
 }
 
 /// 
@@ -264,9 +274,9 @@
 /// @content
 ///
 @mixin js($name) {
-    @include block($name, 'js') {
-        @content;
-    }
+        @include block($name, 'js') {
+                @content;
+        }
 }
 
 ///
@@ -277,7 +287,7 @@
 /// @see {mixin} js
 ///
 @function js($name) {
-    @return block($name, 'js');
+        @return block($name, 'js');
 }
 
 /// 
@@ -288,9 +298,9 @@
 /// @content
 ///
 @mixin qa($name) {
-    @include block($name, 'qa') {
-        @content;
-    }
+        @include block($name, 'qa') {
+                @content;
+        }
 }
 
 ///
@@ -301,7 +311,7 @@
 /// @see {mixin} qa
 ///
 @function qa($name) {
-    @return block($name, 'qa');
+        @return block($name, 'qa');
 }
 
 /// 
@@ -312,9 +322,9 @@
 /// @content
 ///
 @mixin hack($name) {
-    @include block($name, 'hack') {
-        @content;
-    }
+        @include block($name, 'hack') {
+                @content;
+        }
 }
 
 ///
@@ -325,7 +335,7 @@
 /// @see {mixin} hack
 ///
 @function hack($name) {
-    @return block($name, 'hack');
+        @return block($name, 'hack');
 }
 
 /// 
@@ -377,22 +387,22 @@
 ///   // Compilation will fail because c-someBlock is defined after c-anotherBlock__elem
 ///
 @mixin composed-of($block, $blocks...) {
-    @each $block in functions.list-prepend($blocks, $block) {
-        @if type-of($block) == string {
-            @if not index(vars.$blocks, $block) {
-                @error 'Block "#{$block}" does not exist.';
-            }
-        } @else {
-            $name: nth($block, 1);
-            $type: nth($block, 2);
+        @each $block in functions.list-prepend($blocks, $block) {
+                @if meta.type-of($block) == string {
+                        @if not list.index(vars.$blocks, $block) {
+                                @error 'Block "#{$block}" does not exist.';
+                        }
+                } @else {
+                        $name: list.nth($block, 1);
+                        $type: list.nth($block, 2);
 
-            @if not map-get(vars.$namespaces, $type) {
-                @error '"#{$type}" is not a valid type.';
-            }
+                        @if not map.get(vars.$namespaces, $type) {
+                                @error '"#{$type}" is not a valid type.';
+                        }
 
-            @if not index(vars.$blocks, $name + '_' + $type) {
-                @error 'Block "#{$name}" does not exist.';
-            }
-        }
-    }
+                        @if not list.index(vars.$blocks, $name + '_' + $type) {
+                                @error 'Block "#{$name}" does not exist.';
+                        }
+                }
+        }
 }
diff --git a/src/bem/_debug.scss b/src/bem/_debug.scss
index 8ea0f05..b1f20a7 100644
--- a/src/bem/_debug.scss
+++ b/src/bem/_debug.scss
@@ -4,15 +4,16 @@
 /// @access public
 ////
 
+@use 'sass:map';
 @use './vars';
 
 @if vars.$debug {
-    @each $type, $color in vars.$debug-colors {
-        $namespace: map-get(vars.$namespaces, $type);
+        @each $type, $color in vars.$debug-colors {
+                $namespace: map.get(vars.$namespaces, $type);
 
-        [class^='#{$namespace}-'],
-        [class*=' #{$namespace}-'] {
-            outline: 5px solid $color;
-        }
-    }
+                [class^='#{$namespace}-'],
+                [class*=' #{$namespace}-'] {
+                        outline: 5px solid $color;
+                }
+        }
 }
diff --git a/src/bem/_element.scss b/src/bem/_element.scss
index 64862b0..9f108fe 100644
--- a/src/bem/_element.scss
+++ b/src/bem/_element.scss
@@ -4,6 +4,11 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:meta';
+@use 'sass:selector';
+@use 'sass:string';
 @use './validators';
 @use './vars';
 @use '../functions';
@@ -92,22 +97,22 @@
 ///   }
 ///
 @mixin elem($name, $names...) {
-    $result:   elem($name, $names...);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   elem($name, $names...);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'element',
-        (name: $name, names: $names),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'element',
+                (name: $name, names: $names),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -118,99 +123,93 @@
 /// @see {mixin} element
 ///
 @function elem($name, $names...) {
-    $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
-    $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
+        $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
 
-    $parent-context: contexts.get(vars.$context-id, 'block' 'element');
+        $parent-context: contexts.get(vars.$context-id, 'block' 'element');
 
-    $selector:   ();
-    $parts-data: ();
+        $selector:   ();
+        $parts-data: ();
 
-    @if nth($parent-context, 1) == 'element' {
-        @if vars.$element-nesting-policy == 'disallow' {
-            @error 'Element nesting is forbidden.';
-        }
+        @if list.nth($parent-context, 1) == 'element' {
+                @if vars.$element-nesting-policy == 'disallow' {
+                        @error 'Element nesting is forbidden.';
+                }
 
-        @if vars.$element-nesting-policy == 'append' {
-            $element-selector: map-get(nth($parent-context, 2), 'selector');
+                @if vars.$element-nesting-policy == 'append' {
+                        $element-selector: map.get(list.nth($parent-context, 2), 'selector');
 
-            @if not functions.selector-suffix-match(&, $element-selector) {
-                @error 'A nested element must be an immediate children of the parent element.';
-            }
+                        @if not functions.selector-suffix-match(&, $element-selector) {
+                                @error 'A nested element must be an immediate children of the parent element.';
+                        }
 
-            //
-            // Possible outcomes:
-            //   - {e}__element
-            //   - [manual selector] {e}__element
-            //
+                        //
+                        // Possible outcomes:
+                        //   - {e}__element
+                        //   - [manual selector] {e}__element
+                        //
 
-            @each $name in join($name, $names) {
-                $sel:        selector-append(&, vars.$element-separator + $name);
-                $selector:   join($selector, $sel, comma);
-                $parts-data: append(
-                    $parts-data, (
-                        'name':     $name,
-                        'selector': $sel
-                    )
-                );
-            }
-        }
+                        @each $name in list.join($name, $names) {
+                                $sel:        selector.append(&, vars.$element-separator + $name);
+                                $selector:   list.join($selector, $sel, comma);
+                                $parts-data: list.append($parts-data, (
+                                        'name':     $name,
+                                        'selector': $sel
+                                ));
+                        }
+                }
 
-        $parent-context: contexts.get(vars.$context-id, 'block');
-    }
+                $parent-context: contexts.get(vars.$context-id, 'block');
+        }
 
-    @if length($selector) == 0 {
-        $parent-selector: map-get(nth($parent-context, 2), 'selector');
+        @if list.length($selector) == 0 {
+                $parent-selector: map.get(list.nth($parent-context, 2), 'selector');
 
-        @if functions.selector-suffix-match(&, $parent-selector) {
-            //
-            // Possible outcomes:
-            //   - {b}__element
-            //   - [manual selector] {b}__element
-            //
+                @if functions.selector-suffix-match(&, $parent-selector) {
+                        //
+                        // Possible outcomes:
+                        //   - {b}__element
+                        //   - [manual selector] {b}__element
+                        //
 
-            @each $name in join($name, $names) {
-                $sel:        selector-append(&, vars.$element-separator + $name);
-                $selector:   join($selector, $sel, comma);
-                $parts-data: append(
-                    $parts-data, (
-                        'name':     $name,
-                        'selector': $sel
-                    )
-                );
-            }
-        } @else {
-            //
-            // Possible outcomes:
-            //   - {b} [manual selector] {b}__element
-            //   - {e,m,s} ([manual selector]) {b}__element
-            //
+                        @each $name in list.join($name, $names) {
+                                $sel:        selector.append(&, vars.$element-separator + $name);
+                                $selector:   list.join($selector, $sel, comma);
+                                $parts-data: list.append($parts-data, (
+                                        'name':     $name,
+                                        'selector': $sel
+                                ));
+                        }
+                } @else {
+                        //
+                        // Possible outcomes:
+                        //   - {b} [manual selector] {b}__element
+                        //   - {e,m,s} ([manual selector]) {b}__element
+                        //
 
-            @if nth($parent-context, 1) != 'block' {
-                $parent-context: contexts.get(vars.$context-id, 'block');
-            }
+                        @if list.nth($parent-context, 1) != 'block' {
+                                $parent-context: contexts.get(vars.$context-id, 'block');
+                        }
 
-            $block-base-selector: map-get(nth($parent-context, 2), 'base-selector');
+                        $block-base-selector: map.get(list.nth($parent-context, 2), 'base-selector');
 
-            @each $name in join($name, $names) {
-                $sel:        selector-nest(&, selector-append($block-base-selector, vars.$element-separator + $name));
-                $selector:   join($selector, $sel, comma);
-                $parts-data: append(
-                    $parts-data, (
-                        'name':     $name,
-                        'selector': $sel
-                    )
-                );
-            }
-        }
-    }
+                        @each $name in list.join($name, $names) {
+                                $sel:        selector.nest(&, selector.append($block-base-selector, vars.$element-separator + $name));
+                                $selector:   list.join($selector, $sel, comma);
+                                $parts-data: list.append($parts-data, (
+                                        'name':     $name,
+                                        'selector': $sel
+                                ));
+                        }
+                }
+        }
 
-    $context: 'element', (
-        'parts':    $parts-data,
-        'selector': $selector
-    );
+        $context: 'element', (
+                'parts':    $parts-data,
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
 
 /// 
@@ -291,22 +290,22 @@
 ///   }
 ///
 @mixin related-elem($sign, $name, $names...) {
-    $result:   related-elem($sign, $name, $names...);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   related-elem($sign, $name, $names...);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'related-element',
-        (sign: $sign, name: $name, names: $names),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'related-element',
+                (sign: $sign, name: $name, names: $names),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -318,44 +317,42 @@
 /// @see {mixin} related-element
 ///
 @function related-elem($sign, $name, $names...) {
-    //
-    // Generating this selector is simple: Take the latest block context, use it
-    // to generate the element part, and insert it at the end of the current selector.
-    // Possible outcomes:
-    //   - {e} ({m,s}) ([manual selector]) + {e}
-    //   - {e} ({m,s}) ([manual selector]) ~ {e}
-    //
+        //
+        // Generating this selector is simple: Take the latest block context, use it
+        // to generate the element part, and insert it at the end of the current selector.
+        // Possible outcomes:
+        //   - {e} ({m,s}) ([manual selector]) + {e}
+        //   - {e} ({m,s}) ([manual selector]) ~ {e}
+        //
 
-    $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
-    $noop: contexts.assert-stack-must-contain(vars.$context-id, 'element');
+        $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        $noop: contexts.assert-stack-must-contain(vars.$context-id, 'element');
 
-    @if $sign != '+' and $sign != '~' {
-        @error 'Invalid relationship sign #{inspect($sign)}.';
-    }
+        @if $sign != '+' and $sign != '~' {
+                @error 'Invalid relationship sign #{inspect($sign)}.';
+        }
 
-    $block-context:       contexts.get(vars.$context-id, 'block');
-    $block-base-selector: map-get(nth($block-context, 2), 'base-selector');
+        $block-context:       contexts.get(vars.$context-id, 'block');
+        $block-base-selector: map.get(list.nth($block-context, 2), 'base-selector');
 
-    $selector:   ();
-    $parts-data: ();
+        $selector:   ();
+        $parts-data: ();
 
-    @each $name in join($name, $names) {
-        $sel:        selector-nest(&, $sign, selector-append($block-base-selector, vars.$element-separator + $name));
-        $selector:   join($selector, $sel, comma);
-        $parts-data: append(
-            $parts-data, (
-                'name':     $name,
-                'selector': $sel
-            )
-        );
-    }
+        @each $name in list.join($name, $names) {
+                $sel:        selector.nest(&, $sign, selector.append($block-base-selector, vars.$element-separator + $name));
+                $selector:   list.join($selector, $sel, comma);
+                $parts-data: list.append($parts-data, (
+                        'name':     $name,
+                        'selector': $sel
+                ));
+        }
 
-    $context: 'element', (
-        'parts':    $parts-data,
-        'selector': $selector
-    );
+        $context: 'element', (
+                'parts':    $parts-data,
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
 
 /// 
@@ -369,9 +366,9 @@
 /// @content
 ///
 @mixin sibling-elem($name, $names...) {
-    @include related-elem('~', $name, $names...) {
-        @content;
-    }
+        @include related-elem('~', $name, $names...) {
+                @content;
+        }
 }
 
 ///
@@ -383,7 +380,7 @@
 /// @see {mixin} sibling-element
 ///
 @function sibling-elem($name, $names...) {
-    @return related-elem('~', $name, $names...);
+        @return related-elem('~', $name, $names...);
 }
 
 /// 
@@ -397,9 +394,9 @@
 /// @content
 ///
 @mixin next-elem($name, $names...) {
-    @include related-elem('+', $name, $names...) {
-        @content;
-    }
+        @include related-elem('+', $name, $names...) {
+                @content;
+        }
 }
 
 ///
@@ -411,7 +408,7 @@
 /// @see {mixin} next-element
 ///
 @function next-elem($name, $names...) {
-    @return related-elem('+', $name, $names...);
+        @return related-elem('+', $name, $names...);
 }
 
 /// 
@@ -467,22 +464,22 @@
 ///   }
 ///
 @mixin related-twin-elem($sign) {
-    $result:   related-twin-elem($sign);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   related-twin-elem($sign);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'next-twin-elem',
-        (),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'next-twin-elem',
+                (),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -494,96 +491,94 @@
 /// @see {mixin} next-twin-elem
 ///
 @function related-twin-elem($sign) {
-    $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
-    $noop: contexts.assert-stack-must-contain(vars.$context-id, 'element');
+        $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        $noop: contexts.assert-stack-must-contain(vars.$context-id, 'element');
 
-    $element-context:  contexts.get(vars.$context-id, 'element');
-    $element-selector: map-get(nth($element-context, 2), 'selector');
+        $element-context:  contexts.get(vars.$context-id, 'element');
+        $element-selector: map.get(list.nth($element-context, 2), 'selector');
 
-    $block-context:       contexts.get(vars.$context-id, 'block');
-    $block-base-selector: map-get(nth($block-context, 2), 'base-selector');
+        $block-context:       contexts.get(vars.$context-id, 'block');
+        $block-base-selector: map.get(list.nth($block-context, 2), 'base-selector');
 
-    $selector:   ();
-    $parts-data: ();
+        $selector:   ();
+        $parts-data: ();
 
-    //
-    // To determine the twin for each element, iterate the sub-selectors from the current selector
-    // and check if it contains the currently inspected element. This has to be done with string
-    // comparison since none of Sass selector functions is of use here.
-    // Finally, the current twin will be appended to the extracted sub-selector as a successor
-    // element.
-    //
-    @each $part-data in map-get(nth($element-context, 2), 'parts') {
-        $part-selector: map-get($part-data, 'selector');
-        $part-name:     map-get($part-data, 'name');
+        //
+        // To determine the twin for each element, iterate the sub-selectors from the current selector
+        // and check if it contains the currently inspected element. This has to be done with string
+        // comparison since none of Sass selector functions is of use here.
+        // Finally, the current twin will be appended to the extracted sub-selector as a successor
+        // element.
+        //
+        @each $part-data in map.get(list.nth($element-context, 2), 'parts') {
+                $part-selector: map.get($part-data, 'selector');
+                $part-name:     map.get($part-data, 'name');
 
-        $sel: ();
-        @if functions.selector-suffix-match(&, $element-selector) {
-            //
-            // This mixin is included in the selector the last element mixin created.
-            // Possible outcomes:
-            //   - {e} + {e}
-            //   - [manual selector] {e} + {e}
-            //
+                $sel: ();
+                @if functions.selector-suffix-match(&, $element-selector) {
+                        //
+                        // This mixin is included in the selector the last element mixin created.
+                        // Possible outcomes:
+                        //   - {e} + {e}
+                        //   - [manual selector] {e} + {e}
+                        //
 
-            @each $s in & {
-                @each $ps in $part-selector {
-                    @if nth($s, -1) == nth($ps, -1) {
-                        $sel-ent: selector-nest($s, $sign, selector-append($block-base-selector, vars.$element-separator + $part-name));
-                        $sel:     join($sel, $sel-ent, comma);
-                    }
-                }
-            }
-        } @else {
-            //
-            // This mixin is NOT included in the selector the last element mixin created.
-            // Possible outcomes:
-            //   - {e} {m,s} + {e}
-            //   - {e} [manual selector] + {e}
-            //   - {e} {m,s} [manual selector] + {e}
-            //
+                        @each $s in & {
+                                @each $ps in $part-selector {
+                                        @if list.nth($s, -1) == list.nth($ps, -1) {
+                                                $sel-ent: selector.nest($s, $sign, selector.append($block-base-selector, vars.$element-separator + $part-name));
+                                                $sel:     list.join($sel, $sel-ent, comma);
+                                        }
+                                }
+                        }
+                } @else {
+                        //
+                        // This mixin is NOT included in the selector the last element mixin created.
+                        // Possible outcomes:
+                        //   - {e} {m,s} + {e}
+                        //   - {e} [manual selector] + {e}
+                        //   - {e} {m,s} [manual selector] + {e}
+                        //
 
-            @each $s in & {
-                @each $ps in $part-selector {
-                    @if str-index(inspect($s), inspect($ps)) {
-                        $char-index: str-length(inspect($ps)) + 1;
-                        $match:      index(' ' ':' ',', str-slice(inspect($s), $char-index, $char-index)) != null;
+                        @each $s in & {
+                                @each $ps in $part-selector {
+                                        @if string.index(meta.inspect($s), meta.inspect($ps)) {
+                                                $char-index: string.length(meta.inspect($ps)) + 1;
+                                                $match:      list.index(' ' ':' ',', string.slice(meta.inspect($s), $char-index, $char-index)) != null;
 
-                        @if not $match {
-                            @each $separator in vars.$element-separator vars.$modifier-separator vars.$suffix-separator {
-                                @if str-slice(inspect($s), $char-index, $char-index + str-length($separator) - 1) == $separator {
-                                    $match: true;
-                                }
-                            }
-                        }
+                                                @if not $match {
+                                                        @each $separator in vars.$element-separator vars.$modifier-separator vars.$suffix-separator {
+                                                                @if string.slice(meta.inspect($s), $char-index, $char-index + string.length($separator) - 1) == $separator {
+                                                                        $match: true;
+                                                                }
+                                                        }
+                                                }
 
-                        @if $match {
-                            $sel-ent: selector-nest($s, '+', selector-append($block-base-selector, vars.$element-separator + $part-name));
-                            $sel:     join($sel, $sel-ent, comma);
-                        }
-                    }
-                }
-            }
-        }
-        @if length($sel) != length($part-selector) {
-            @error 'Could not generate twin element selector.';
-        }
+                                                @if $match {
+                                                        $sel-ent: selector.nest($s, '+', selector.append($block-base-selector, vars.$element-separator + $part-name));
+                                                        $sel:     list.join($sel, $sel-ent, comma);
+                                                }
+                                        }
+                                }
+                        }
+                }
+                @if list.length($sel) != list.length($part-selector) {
+                        @error 'Could not generate twin element selector.';
+                }
 
-        $selector:   join($selector, $sel, comma);
-        $parts-data: append(
-            $parts-data, (
-                'name':     $part-name,
-                'selector': $sel
-            )
-        );
-    }
+                $selector:   list.join($selector, $sel, comma);
+                $parts-data: list.append($parts-data, (
+                        'name':     $part-name,
+                        'selector': $sel
+                ));
+        }
 
-    $context: 'element', (
-        'parts':    $parts-data,
-        'selector': $selector
-    );
+        $context: 'element', (
+                'parts':    $parts-data,
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
 
 /// 
@@ -594,9 +589,9 @@
 /// @content
 ///
 @mixin sibling-twin-element {
-    @include related-twin-elem('~') {
-        @content;
-    }
+        @include related-twin-elem('~') {
+                @content;
+        }
 }
 
 ///
@@ -608,7 +603,7 @@
 /// @see {mixin} sibling-twin-element
 ///
 @function sibling-twin-elem() {
-    @return related-twin-elem('~');
+        @return related-twin-elem('~');
 }
 
 /// 
@@ -619,9 +614,9 @@
 /// @content
 ///
 @mixin next-twin-elem {
-    @include related-twin-elem('+') {
-        @content;
-    }
+        @include related-twin-elem('+') {
+                @content;
+        }
 }
 
 ///
@@ -633,5 +628,5 @@
 /// @see {mixin} next-twin-elem
 ///
 @function next-twin-elem() {
-    @return related-twin-elem('+');
+        @return related-twin-elem('+');
 }
diff --git a/src/bem/_functions.scss b/src/bem/_functions.scss
index b7bd5ec..7f52b93 100644
--- a/src/bem/_functions.scss
+++ b/src/bem/_functions.scss
@@ -4,25 +4,28 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:selector';
 @use './vars';
 
 ///
 /// @access private
 ///
 @function theme-selector($name, $names...) {
-    $namespace: map-get(vars.$namespaces, 'theme');
-    $selector:  null;
+        $namespace: map.get(vars.$namespaces, 'theme');
+        $selector:  null;
 
-    @each $name in join($name, $names) {
-        $sel: '.' + $namespace + '-' + $name;
+        @each $name in list.join($name, $names) {
+                $sel: '.' + $namespace + '-' + $name;
 
-        @if $selector == null {
-            $selector: join(selector-parse($sel), selector-parse('[class*=\' t-\'] ' + $sel), comma);
-            $selector: join($selector, selector-parse('[class^=\'t-\'] ' + $sel), comma);
-        } @else {
-            $selector: selector-nest($selector, $sel);
-        }
-    }
+                @if $selector == null {
+                        $selector: list.join(selector.parse($sel), selector.parse('[class*=\' t-\'] ' + $sel), comma);
+                        $selector: list.join($selector, selector.parse('[class^=\'t-\'] ' + $sel), comma);
+                } @else {
+                        $selector: selector.nest($selector, $sel);
+                }
+        }
 
-    @return $selector;
+        @return $selector;
 }
diff --git a/src/bem/_modifier.scss b/src/bem/_modifier.scss
index 07267fe..10e2826 100644
--- a/src/bem/_modifier.scss
+++ b/src/bem/_modifier.scss
@@ -4,6 +4,11 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:meta';
+@use 'sass:selector';
+@use 'sass:string';
 @use './validators';
 @use './vars';
 @use '../functions';
@@ -111,22 +116,22 @@
 ///   }
 ///
 @mixin modifier($name, $names...) {
-    $result:   modifier($name, $names...);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   modifier($name, $names...);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'modifier',
-        (name: $name, names: $names),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'modifier',
+                (name: $name, names: $names),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -137,121 +142,115 @@
 /// @see {mixin} modifier
 ///
 @function modifier($name, $names...) {
-    $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
-    $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
+        $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
 
-    $parent-context:  contexts.get(vars.$context-id, 'block' 'element' 'modifier' 'suffix' 'state');
-    $parent-selector: map-get(nth($parent-context, 2), 'selector');
-    $selector:        ();
-    $parts-data:      ();
+        $parent-context:  contexts.get(vars.$context-id, 'block' 'element' 'modifier' 'suffix' 'state');
+        $parent-selector: map.get(list.nth($parent-context, 2), 'selector');
+        $selector:        ();
+        $parts-data:      ();
 
-    @if not functions.selector-suffix-match(&, $parent-selector) {
-        //
-        // The current selector doesn't match the parent selector.
-        // The user manually added a selector between parent context and this modifier call.
-        // This case is forbidden because any outcome semantically wouldn't make sense:
-        //   - {b,e,m,s} [manual selector] {b,e,m,s}--modifier
-        //   - {b,e,m,s}--modifier [manual selector]
-        // The first case would make the modifier behave like an element.
-        // The second case is unintuitive, the code would be more clear by nesting the manual
-        // selector in the modifier instead.
-        //
+        @if not functions.selector-suffix-match(&, $parent-selector) {
+                //
+                // The current selector doesn't match the parent selector.
+                // The user manually added a selector between parent context and this modifier call.
+                // This case is forbidden because any outcome semantically wouldn't make sense:
+                //   - {b,e,m,s} [manual selector] {b,e,m,s}--modifier
+                //   - {b,e,m,s}--modifier [manual selector]
+                // The first case would make the modifier behave like an element.
+                // The second case is unintuitive, the code would be more clear by nesting the manual
+                // selector in the modifier instead.
+                //
 
-        @error 'A modifier must be an immediate child of the parent context';
-    }
+                @error 'A modifier must be an immediate child of the parent context';
+        }
 
-    @each $name in functions.list-prepend($names, $name) {
-        $extend: false;
-        @if type-of($name) == list {
-            $extend: nth($name, 2);
-            $name:   nth($name, 1);
-        }
+        @each $name in functions.list-prepend($names, $name) {
+                $extend: false;
+                @if meta.type-of($name) == list {
+                        $extend: list.nth($name, 2);
+                        $name:   list.nth($name, 1);
+                }
 
-        @if index('block' 'element', nth($parent-context, 1)) or $extend == true {
-            //
-            // Either the parent context is block or element, or a modifier or suffix
-            // is to be extended. The modifier part can simply be appended.
-            // Possible outcomes:
-            //   - {b,e,m,s}--modifier
-            //
+                @if list.index('block' 'element', list.nth($parent-context, 1)) or $extend == true {
+                        //
+                        // Either the parent context is block or element, or a modifier or suffix
+                        // is to be extended. The modifier part can simply be appended.
+                        // Possible outcomes:
+                        //   - {b,e,m,s}--modifier
+                        //
 
-            $sel:        selector-append(&, vars.$modifier-separator + $name);
-            $selector:   join($selector, $sel, comma);
-            $parts-data: append(
-                $parts-data, (
-                    'name':     $name,
-                    'selector': $sel
-                )
-            );
-        } @else {
-            //
-            // Parent context is modifier, suffix or state and $extend is false.
-            //
+                        $sel:        selector.append(&, vars.$modifier-separator + $name);
+                        $selector:   list.join($selector, $sel, comma);
+                        $parts-data: list.append($parts-data, (
+                                'name':     $name,
+                                'selector': $sel
+                        ));
+                } @else {
+                        //
+                        // Parent context is modifier, suffix or state and $extend is false.
+                        //
 
-            $be-context: contexts.get(vars.$context-id, 'block' 'element');
+                        $be-context: contexts.get(vars.$context-id, 'block' 'element');
 
-            @if nth($be-context, 1) == 'element' {
-                //
-                // Latest context is element. Since element contexts can consist of multiple single
-                // elements, inspect all elements and append its selector with the suffix "--$name".
-                // This has to be done with string comparison since none of Sass selector functions
-                // is of use here. 
-                // Possible outcomes:
-                //   - {m,s}.{e}--modifier
-                //
+                        @if list.nth($be-context, 1) == 'element' {
+                                //
+                                // Latest context is element. Since element contexts can consist of multiple single
+                                // elements, inspect all elements and append its selector with the suffix "--$name".
+                                // This has to be done with string comparison since none of Sass selector functions
+                                // is of use here. 
+                                // Possible outcomes:
+                                //   - {m,s}.{e}--modifier
+                                //
 
-                $nsel: ();
+                                $nsel: ();
 
-                @each $elem-part-data in map-get(nth($be-context, 2), 'parts') {
-                    $elem-part-selector: map-get($elem-part-data, 'selector');
+                                @each $elem-part-data in map.get(list.nth($be-context, 2), 'parts') {
+                                        $elem-part-selector: map.get($elem-part-data, 'selector');
 
-                    $sel: ();
-                    @each $s in & {
-                        @each $ps in $elem-part-selector {
-                            @if str-index(inspect($s), inspect($ps) + vars.$modifier-separator) or str-index(inspect($s), inspect($ps) + vars.$suffix-separator) {
-                                $sel: join($sel, selector-unify($s, selector-append($ps, vars.$modifier-separator + $name)), comma);
-                            }
-                        }
-                    }
-                    @if length($sel) == 0 {
-                        @error 'Could not generate modifier selector.';
-                    }
+                                        $sel: ();
+                                        @each $s in & {
+                                                @each $ps in $elem-part-selector {
+                                                        @if string.index(meta.inspect($s), meta.inspect($ps) + vars.$modifier-separator) or string.index(meta.inspect($s), meta.inspect($ps) + vars.$suffix-separator) {
+                                                                $sel: list.join($sel, selector.unify($s, selector.append($ps, vars.$modifier-separator + $name)), comma);
+                                                        }
+                                                }
+                                        }
+                                        @if list.length($sel) == 0 {
+                                                @error 'Could not generate modifier selector.';
+                                        }
 
-                    $nsel: join($nsel, $sel, comma);
-                }
+                                        $nsel: list.join($nsel, $sel, comma);
+                                }
 
-                $selector:   join($selector, $nsel, comma);
-                $parts-data: append(
-                    $parts-data, (
-                        'name':     $name,
-                        'selector': $nsel
-                    )
-                );
-            } @else {
-                //
-                // Latest context is block. Just append the modifier part.
-                // Possible outcomes:
-                //   - {m,s}.{b}--modifier
-                //
+                                $selector:   list.join($selector, $nsel, comma);
+                                $parts-data: list.append($parts-data, (
+                                        'name':     $name,
+                                        'selector': $nsel
+                                ));
+                        } @else {
+                                //
+                                // Latest context is block. Just append the modifier part.
+                                // Possible outcomes:
+                                //   - {m,s}.{b}--modifier
+                                //
 
-                $block-base-selector: map-get(nth($be-context, 2), 'base-selector');
+                                $block-base-selector: map.get(list.nth($be-context, 2), 'base-selector');
 
-                $sel:        selector-append(&, $block-base-selector, vars.$modifier-separator + $name);
-                $selector:   join($selector, $sel, comma);
-                $parts-data: append(
-                    $parts-data, (
-                        'name':     $name,
-                        'selector': $sel
-                    )
-                );
-            }
-        }
-    }
+                                $sel:        selector.append(&, $block-base-selector, vars.$modifier-separator + $name);
+                                $selector:   list.join($selector, $sel, comma);
+                                $parts-data: list.append($parts-data, (
+                                        'name':     $name,
+                                        'selector': $sel
+                                ));
+                        }
+                }
+        }
 
-    $context: 'modifier', (
-        'parts':    $parts-data,
-        'selector': $selector
-    );
+        $context: 'modifier', (
+                'parts':    $parts-data,
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
diff --git a/src/bem/_multi.scss b/src/bem/_multi.scss
index 1de5cdc..c0beeeb 100644
--- a/src/bem/_multi.scss
+++ b/src/bem/_multi.scss
@@ -4,6 +4,10 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:meta';
+@use 'sass:selector';
+@use 'sass:string';
 @use '../functions';
 @use '../contexts';
 @use './block';
@@ -81,67 +85,67 @@
 ///   }
 ///
 @mixin multi($first, $others...) {
-    @include contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        @include contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
 
-    @each $entity in functions.list-prepend($others, $first) {
-        $is-manual-selector: false;
+        @each $entity in functions.list-prepend($others, $first) {
+                $is-manual-selector: false;
 
-        @if type-of($entity) == string {
-            @if find-bem-function($entity) == null {
-                $is-manual-selector: true;
-            }
-        }
+                @if meta.type-of($entity) == string {
+                        @if find-bem-function($entity) == null {
+                                $is-manual-selector: true;
+                        }
+                }
 
-        @if $is-manual-selector {
-            $sel: if(&, selector-nest(&, $entity), selector-parse($entity));
+                @if $is-manual-selector {
+                        $sel: if(&, selector.nest(&, $entity), selector.parse($entity));
 
-            @at-root #{$sel} {
-                @content;
-            }
-        } @else {
-            $entity-func-id: null;
+                        @at-root #{$sel} {
+                                @content;
+                        }
+                } @else {
+                        $entity-func-id: null;
 
-            @if type-of($entity) == list {
-                $entity-func-id: nth($entity, 1);
-                $entity:         functions.list-slice($entity, 2);
-            } @else {
-                $entity-func-id: $entity;
-                $entity:         ();
-            }
+                        @if meta.type-of($entity) == list {
+                                $entity-func-id: list.nth($entity, 1);
+                                $entity:         functions.list-slice($entity, 2);
+                        } @else {
+                                $entity-func-id: $entity;
+                                $entity:         ();
+                        }
 
-            @if str-slice($entity-func-id, str-length($entity-func-id)) == ':' {
-                $entity-func-id: unquote(str-slice($entity-func-id, 1, str-length($entity-func-id) - 1));
-            }
+                        @if string.slice($entity-func-id, string.length($entity-func-id)) == ':' {
+                                $entity-func-id: string.unquote(string.slice($entity-func-id, 1, string.length($entity-func-id) - 1));
+                        }
 
-            $sel-func: find-bem-function($entity-func-id);
+                        $sel-func: find-bem-function($entity-func-id);
 
-            @if $sel-func == null {
-                @error 'Function "#{inspect($entity-func-id)}" was not found.';
-            }
+                        @if $sel-func == null {
+                                @error 'Function "#{inspect($entity-func-id)}" was not found.';
+                        }
 
-            $entity-result:          call($sel-func, $entity...);
-            $entity-result-selector: nth($entity-result, 1);
-            $entity-result-context:  nth($entity-result, 2);
+                        $entity-result:          meta.call($sel-func, $entity...);
+                        $entity-result-selector: list.nth($entity-result, 1);
+                        $entity-result-context:  list.nth($entity-result, 2);
 
-            @if $entity-result-context != null {
-                @include contexts.push(vars.$context-id, $entity-result-context...);
-            }
-            @at-root #{$entity-result-selector} {
-                @content;
-            }
-            @if $entity-result-context != null {
-                @include contexts.pop(vars.$context-id);
-            }
-        }
-    }
+                        @if $entity-result-context != null {
+                                @include contexts.push(vars.$context-id, $entity-result-context...);
+                        }
+                        @at-root #{$entity-result-selector} {
+                                @content;
+                        }
+                        @if $entity-result-context != null {
+                                @include contexts.pop(vars.$context-id);
+                        }
+                }
+        }
 }
 
 @function find-bem-function($name) {
-    @each $module in (block element modifier state suffix theme) {
-        @if function-exists($name, $module) {
-            @return get-function($name, $module: $module);
-        }
-    }
+        @each $module in (block element modifier state suffix theme) {
+                @if meta.function-exists($name, $module) {
+                        @return meta.get-function($name, $module: $module);
+                }
+        }
 
-    @return null;
+        @return null;
 }
diff --git a/src/bem/_state.scss b/src/bem/_state.scss
index 41bacee..bd0efb1 100644
--- a/src/bem/_state.scss
+++ b/src/bem/_state.scss
@@ -4,6 +4,8 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:selector';
 @use './validators';
 @use './vars';
 @use '../contexts';
@@ -56,22 +58,22 @@
 ///   }
 ///
 @mixin state($prefix, $state, $states...) {
-    $result:   state($prefix, $state, $states...);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   state($prefix, $state, $states...);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'state',
-        (prefix: $prefix, state: $state, states: $states),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'state',
+                (prefix: $prefix, state: $state, states: $states),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -82,29 +84,27 @@
 /// @see {mixin} has
 ///
 @function state($prefix, $state, $states...) {
-    $selector:   ();
-    $parts-data: ();
+        $selector:   ();
+        $parts-data: ();
 
-    @each $state in join($state, $states) {
-        $sel:        selector-parse('.#{$prefix}-#{$state}');
-        @if & {
-            $sel:    selector-append(&, $sel);
-        }
-        $selector:   join($selector, $sel, comma);
-        $parts-data: append(
-            $parts-data, (
-                'name':     $state,
-                'selector': $sel
-            )
-        );
-    }
+        @each $state in list.join($state, $states) {
+                $sel:        selector.parse('.#{$prefix}-#{$state}');
+                @if & {
+                        $sel:    selector.append(&, $sel);
+                }
+                $selector:   list.join($selector, $sel, comma);
+                $parts-data: list.append($parts-data, (
+                        'name':     $state,
+                        'selector': $sel
+                ));
+        }
 
-    $context: 'state', (
-        'parts':    $parts-data,
-        'selector': $selector
-    );
+        $context: 'state', (
+                'parts':    $parts-data,
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
 
 /// 
@@ -113,9 +113,9 @@
 /// It's a shorthand for state('is', $state, $states...).
 ///
 @mixin is($state, $states...) {
-    @include state('is', $state, $states...) {
-        @content;
-    }
+        @include state('is', $state, $states...) {
+                @content;
+        }
 }
 
 ///
@@ -126,7 +126,7 @@
 /// @see {mixin} is
 ///
 @function is($state, $states...) {
-    @return state('is', $state, $states...);
+        @return state('is', $state, $states...);
 }
 
 /// 
@@ -135,9 +135,9 @@
 /// It's a shorthand for state('has', $state, $states...).
 ///
 @mixin has($state, $states...) {
-    @include state('has', $state, $states...) {
-        @content;
-    }
+        @include state('has', $state, $states...) {
+                @content;
+        }
 }
 
 ///
@@ -148,5 +148,5 @@
 /// @see {mixin} has
 ///
 @function has($state, $states...) {
-    @return state('has', $state, $states...);
+        @return state('has', $state, $states...);
 }
diff --git a/src/bem/_suffix.scss b/src/bem/_suffix.scss
index 2ddb54d..93e4066 100644
--- a/src/bem/_suffix.scss
+++ b/src/bem/_suffix.scss
@@ -4,6 +4,9 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:selector';
 @use './validators';
 @use './vars';
 @use '../functions';
@@ -54,22 +57,22 @@
 ///   }
 ///
 @mixin suffix($name) {
-    $result:   suffix($name);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   suffix($name);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'suffix',
-        (name: $name),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'suffix',
+                (name: $name),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -80,44 +83,44 @@
 /// @see {mixin} suffix
 ///
 @function suffix($name) {
-    //
-    // Suffixes can be used on block, element and modifier.
-    //
+        //
+        // Suffixes can be used on block, element and modifier.
+        //
 
-    $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
-    $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
-    $noop: contexts.assert-stack-must-not-contain(vars.$context-id, 'suffix');
+        $noop: contexts.assert-stack-count(vars.$context-id, vars.$max-depth);
+        $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
+        $noop: contexts.assert-stack-must-not-contain(vars.$context-id, 'suffix');
 
-    $parent-context:  contexts.get(vars.$context-id, 'block' 'element' 'modifier');
-    $parent-selector: map-get(nth($parent-context, 2), 'selector');
+        $parent-context:  contexts.get(vars.$context-id, 'block' 'element' 'modifier');
+        $parent-selector: map.get(list.nth($parent-context, 2), 'selector');
 
-    @if not functions.selector-suffix-match(&, $parent-selector) {
-        //
-        // The current selector doesn't match the parent selector.
-        // The user manually added a selector between parent context and this suffix call.
-        // This case is forbidden because any outcome semantically wouldn't make sense:
-        //   - {b,e,m} [manual selector] {b,e,m}@suffix
-        //   - {b,e,m}@suffix [manual selector]
-        // The first case would make the modifier behave like an element.
-        // The second case is unintuitive, the code would be more clear by nesting the manual
-        // selector in the suffix instead.
-        //
+        @if not functions.selector-suffix-match(&, $parent-selector) {
+                //
+                // The current selector doesn't match the parent selector.
+                // The user manually added a selector between parent context and this suffix call.
+                // This case is forbidden because any outcome semantically wouldn't make sense:
+                //   - {b,e,m} [manual selector] {b,e,m}@suffix
+                //   - {b,e,m}@suffix [manual selector]
+                // The first case would make the modifier behave like an element.
+                // The second case is unintuitive, the code would be more clear by nesting the manual
+                // selector in the suffix instead.
+                //
 
-        @error 'A suffix must be an immediate child of the parent context';
-    }
+                @error 'A suffix must be an immediate child of the parent context';
+        }
 
-    //
-    // The suffix part can simply be appended.
-    // Possible outcomes:
-    //   - {b,e,m}@suffix
-    //
+        //
+        // The suffix part can simply be appended.
+        // Possible outcomes:
+        //   - {b,e,m}@suffix
+        //
 
-    $selector: selector-append(&, vars.$suffix-separator + $name);
+        $selector: selector.append(&, vars.$suffix-separator + $name);
 
-    $context: 'suffix', (
-        'name':     $name,
-        'selector': $selector
-    );
+        $context: 'suffix', (
+                'name':     $name,
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
diff --git a/src/bem/_theme.scss b/src/bem/_theme.scss
index ff1ba49..535cc81 100644
--- a/src/bem/_theme.scss
+++ b/src/bem/_theme.scss
@@ -4,6 +4,9 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:selector';
 @use './functions';
 @use './validators';
 @use './vars';
@@ -18,22 +21,22 @@
 /// @content
 ///
 @mixin at-theme($name, $names...) {
-    $result:   at-theme($name, $names...);
-    $selector: nth($result, 1);
-    $context:  nth($result, 2);
+        $result:   at-theme($name, $names...);
+        $selector: list.nth($result, 1);
+        $context:  list.nth($result, 2);
 
-    @include validators.validate(
-        'at-theme',
-        (name: $name, names: $names),
-        $selector,
-        $context
-    );
+        @include validators.validate(
+                'at-theme',
+                (name: $name, names: $names),
+                $selector,
+                $context
+        );
 
-    @include contexts.push(vars.$context-id, $context...);
-    @at-root #{$selector} {
-        @content;
-    }
-    @include contexts.pop(vars.$context-id);
+        @include contexts.push(vars.$context-id, $context...);
+        @at-root #{$selector} {
+                @content;
+        }
+        @include contexts.pop(vars.$context-id);
 }
 
 ///
@@ -45,22 +48,22 @@
 /// @see {mixin} at-theme
 ///
 @function at-theme($name, $names...) {
-    $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
+        $noop: contexts.assert-stack-must-contain(vars.$context-id, 'block');
 
-    $parent-context:  contexts.get(vars.$context-id, 'block');
-    $parent-selector: map-get(nth($parent-context, 2), 'selector');
+        $parent-context:  contexts.get(vars.$context-id, 'block');
+        $parent-selector: map.get(list.nth($parent-context, 2), 'selector');
 
-    //@if not functions.selector-suffix-match(&, $parent-selector) {
-    //    @error 'An at-theme rule must be an immediate child of a block';
-    //}
+        //@if not functions.selector-suffix-match(&, $parent-selector) {
+        //    @error 'An at-theme rule must be an immediate child of a block';
+        //}
 
-    $selector: functions.theme-selector($name, $names...);
-    $selector: selector-nest($selector, &);
+        $selector: functions.theme-selector($name, $names...);
+        $selector: selector.nest($selector, &);
 
-    $context: 'at-theme', (
-        'name':     join($name, $names),
-        'selector': $selector
-    );
+        $context: 'at-theme', (
+                'name':     list.join($name, $names),
+                'selector': $selector
+        );
 
-    @return $selector $context;
+        @return $selector $context;
 }
diff --git a/src/bem/_validators.scss b/src/bem/_validators.scss
index 042e15e..bc3c9b7 100644
--- a/src/bem/_validators.scss
+++ b/src/bem/_validators.scss
@@ -16,6 +16,9 @@
 /// @access public
 ////
 
+@use 'sass:list';
+@use 'sass:map';
+@use 'sass:meta';
 @use './vars';
 @use '../functions';
 @use '../contexts';
@@ -46,7 +49,7 @@ $validators: ();
 /// @param {string} $func-names - Other function names.
 ///
 @mixin add($func-name, $func-names...) {
-    $noop: add($func-name, $func-names...);
+        $noop: add($func-name, $func-names...);
 }
 
 ///
@@ -55,11 +58,11 @@ $validators: ();
 /// @see {mixin} add
 ///
 @function add($func-name, $func-names...) {
-    @each $fn-name in join($func-name, $func-names) {
-        $fn: get-function($fn-name);
-        $validators: map-merge($validators, ($fn-name: $fn));
-    }
-    @return null;
+        @each $fn-name in list.join($func-name, $func-names) {
+                $fn: meta.get-function($fn-name);
+                $validators: map.merge($validators, ($fn-name: $fn));
+        }
+        @return null;
 }
 
 ///
@@ -69,7 +72,7 @@ $validators: ();
 /// @param {string} $func-names - Other function names.
 ///
 @mixin remove($func-name, $func-names...) {
-    $noop: remove($func-name, $func-names...);
+        $noop: remove($func-name, $func-names...);
 }
 
 ///
@@ -78,20 +81,20 @@ $validators: ();
 /// @see {mixin} remove
 ///
 @function remove($func-name, $func-names...) {
-    $validators: map-remove($validators, $func-name, $func-names...);
-    @return null;
+        $validators: map.remove($validators, $func-name, $func-names...);
+        @return null;
 }
 
 ///
 /// @access private
 ///
 @mixin validate($type, $args, $selector, $context) {
-    @each $id, $fn in $validators {
-        $result: call($fn, $type, $args, $selector, $context);
-        @if not nth($result, 1) {
-            @error 'A BEM validator rejected this mixin usage due to the following reason: #{nth($result, 2)}';
-        }
-    }
+        @each $id, $fn in $validators {
+                $result: meta.call($fn, $type, $args, $selector, $context);
+                @if not list.nth($result, 1) {
+                        @error 'A BEM validator rejected this mixin usage due to the following reason: #{nth($result, 2)}';
+                }
+        }
 }
 
 //
@@ -105,76 +108,76 @@ $validators: ();
 /// namespace used.
 ///
 @function enforce-namespace-order($type, $args, $selector, $context) {
-    @if not global-variable-exists(namespace-order, vars) {
-        vars.$namespace-order: map-keys(vars.$namespaces);
-    }
-    @if not global-variable-exists(cur-namespace-index, vars) {
-        vars.$cur-namespace-index: 1;
-    }
+        @if not meta.global-variable-exists(namespace-order, vars) {
+                vars.$namespace-order: map.keys(vars.$namespaces);
+        }
+        @if not meta.global-variable-exists(cur-namespace-index, vars) {
+                vars.$cur-namespace-index: 1;
+        }
 
-    @if $type == 'block' {
-        $block-type: map-get($args, 'type');
+        @if $type == 'block' {
+                $block-type: map.get($args, 'type');
 
-        @if $block-type != null {
-            $ns-index: index(vars.$namespace-order, $block-type);
+                @if $block-type != null {
+                        $ns-index: list.index(vars.$namespace-order, $block-type);
 
-            @if $ns-index != null {
-                @if $ns-index < vars.$cur-namespace-index {
-                    @return false 'Namespace "#{$block-type}" comes before current namespace #{nth(vars.$namespace-order, vars.$cur-namespace-index)}';
-                }
+                        @if $ns-index != null {
+                                @if $ns-index < vars.$cur-namespace-index {
+                                        @return false 'Namespace "#{$block-type}" comes before current namespace #{nth(vars.$namespace-order, vars.$cur-namespace-index)}';
+                                }
 
-                vars.$cur-namespace-index: $ns-index;
-            }
-        }
-    }
+                                vars.$cur-namespace-index: $ns-index;
+                        }
+                }
+        }
 
-    @return true '';
+        @return true '';
 }
 
 ///
 /// A validator that makes all BEM entities immutable.
 ///
 @function immutable-entities($type, $args, $selector, $context) {
-    @if not global-variable-exists(generated-selectors, vars) {
-        vars.$generated-selectors: ();
-    }
+        @if not meta.global-variable-exists(generated-selectors, vars) {
+                vars.$generated-selectors: ();
+        }
 
-    $block-name: null;
-    $block-type: null;
-    $block-id:   null;
+        $block-name: null;
+        $block-type: null;
+        $block-id:   null;
 
-    @if $type == 'block' {
-        $block-name: map-get($args, 'name');
-        $block-type: map-get($args, 'type');
-    } @else {
-        $block-context: contexts.get(vars.$context-id, 'block');
-        $block-name:    map-get(nth($block-context, 2), 'name');
-        $block-type:    map-get(nth($block-context, 2), 'type');
-    }
+        @if $type == 'block' {
+                $block-name: map.get($args, 'name');
+                $block-type: map.get($args, 'type');
+        } @else {
+                $block-context: contexts.get(vars.$context-id, 'block');
+                $block-name:    map.get(list.nth($block-context, 2), 'name');
+                $block-type:    map.get(list.nth($block-context, 2), 'type');
+        }
 
-    @if $block-type != null {
-        $block-id: $block-name + '_' + $block-type;
-    } @else {
-        $block-id: $block-name;
-    }
+        @if $block-type != null {
+                $block-id: $block-name + '_' + $block-type;
+        } @else {
+                $block-id: $block-name;
+        }
 
-    @if $type == 'block' {
-        @if map-has-key(vars.$generated-selectors, $block-id) {
-            @return false 'Entity "#{$type}" with arguments [ #{functions.map-print($args)} ] was already defined.';
-        }
+        @if $type == 'block' {
+                @if map.has-key(vars.$generated-selectors, $block-id) {
+                        @return false 'Entity "#{$type}" with arguments [ #{functions.map-print($args)} ] was already defined.';
+                }
 
-        vars.$generated-selectors: map-merge(vars.$generated-selectors, ($block-id: ()));
-    } @else {
-        $selectors: map-get(vars.$generated-selectors, $block-id);
+                vars.$generated-selectors: map.merge(vars.$generated-selectors, ($block-id: ()));
+        } @else {
+                $selectors: map.get(vars.$generated-selectors, $block-id);
 
-        @if index($selectors, $selector) {
-            @return false 'Entity "#{$type}" with arguments [ #{functions.map-print($args)} ] was already defined.';
-        }
+                @if list.index($selectors, $selector) {
+                        @return false 'Entity "#{$type}" with arguments [ #{functions.map-print($args)} ] was already defined.';
+                }
 
-        $selectors: append($selectors, $selector);
+                $selectors: list.append($selectors, $selector);
 
-        vars.$generated-selectors: map-merge(vars.$generated-selectors, ($block-id: $selectors));
-    }
+                vars.$generated-selectors: map.merge(vars.$generated-selectors, ($block-id: $selectors));
+        }
 
-    @return true '';
+        @return true '';
 }
diff --git a/src/bem/_vars.scss b/src/bem/_vars.scss
index 3d0f92a..823bf0a 100644
--- a/src/bem/_vars.scss
+++ b/src/bem/_vars.scss
@@ -41,15 +41,15 @@ $suffix-separator: '\\@' !default;
 /// @type map
 ///
 $namespaces: (
-    object:    'o',
-    component: 'c',
-    layout:    'l',
-    scope:     's',
-    theme:     't',
-    utility:   'u',
-    js:        'js',
-    qa:        'qa',
-    hack:      '_'
+        object:    'o',
+        component: 'c',
+        layout:    'l',
+        scope:     's',
+        theme:     't',
+        utility:   'u',
+        js:        'js',
+        qa:        'qa',
+        hack:      '_'
 ) !default;
 
 ///
@@ -100,9 +100,9 @@ $debug: false !default;
 /// @type map
 ///
 $debug-colors: (
-    object:    #ffa500,
-    component: #00f,
-    layout:    #ff0,
-    utility:   #008000,
-    hack:      #f00
+        object:    #ffa500,
+        component: #00f,
+        layout:    #ff0,
+        utility:   #008000,
+        hack:      #f00
 ) !default;
diff --git a/test/_bem.scss b/test/_bem.scss
index b7bd6b4..48a5ee9 100644
--- a/test/_bem.scss
+++ b/test/_bem.scss
@@ -1,21 +1,21 @@
 @use 'true' as *;
 
 @include describe('bem') {
-    //
-    // The following unit tests only test the BEM mixins.
-    // Since they are wrappers for the BEM functions, the latter are
-    // automatically covered.
-    //
+        //
+        // The following unit tests only test the BEM mixins.
+        // Since they are wrappers for the BEM functions, the latter are
+        // automatically covered.
+        //
 
-    @import 'bem/block';
-    @import 'bem/composed-of';
-    @import 'bem/at-theme';
-    @import 'bem/element';
-    @import 'bem/related-element';
-    @import 'bem/next-twin-element';
-    @import 'bem/modifier';
-    @import 'bem/suffix';
-    @import 'bem/state';
-    @import 'bem/multi';
-    @import 'bem/examples';
+        @import 'bem/block';
+        @import 'bem/composed-of';
+        @import 'bem/at-theme';
+        @import 'bem/element';
+        @import 'bem/related-element';
+        @import 'bem/next-twin-element';
+        @import 'bem/modifier';
+        @import 'bem/suffix';
+        @import 'bem/state';
+        @import 'bem/multi';
+        @import 'bem/examples';
 }
diff --git a/test/_contexts.scss b/test/_contexts.scss
index 510f79b..fc49186 100644
--- a/test/_contexts.scss
+++ b/test/_contexts.scss
@@ -2,67 +2,67 @@
 @use '../src/contexts';
 
 @include describe('contexts') {
-    @include it('Creating / deleting context stacks') {
-        @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
-        @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
-    }
+        @include it('Creating / deleting context stacks') {
+                @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
+                @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
+        }
 
-    @include it('Adding / removing contexts') {
-        @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
+        @include it('Adding / removing contexts') {
+                @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
 
-        @include assert-equal(contexts.push('test', 'ctx', 1234),       'ctx' 1234,       'Check if context 1 was pushed');
-        @include assert-equal(contexts.push('test', 'another', 'text'), 'another' 'text', 'Check if context 2 was pushed');
-        @include assert-equal(contexts.push('test', 'ctx', 56),         'ctx' 56,         'Check if context 3 was pushed');
+                @include assert-equal(contexts.push('test', 'ctx', 1234),       'ctx' 1234,       'Check if context 1 was pushed');
+                @include assert-equal(contexts.push('test', 'another', 'text'), 'another' 'text', 'Check if context 2 was pushed');
+                @include assert-equal(contexts.push('test', 'ctx', 56),         'ctx' 56,         'Check if context 3 was pushed');
 
-        @include assert-equal(contexts.pop('test'), 'ctx' 56,         'Check if context 3 was popped');
-        @include assert-equal(contexts.pop('test'), 'another' 'text', 'Check if context 2 was popped');
-        @include assert-equal(contexts.pop('test'), 'ctx' 1234,       'Check if context 1 was popped');
+                @include assert-equal(contexts.pop('test'), 'ctx' 56,         'Check if context 3 was popped');
+                @include assert-equal(contexts.pop('test'), 'another' 'text', 'Check if context 2 was popped');
+                @include assert-equal(contexts.pop('test'), 'ctx' 1234,       'Check if context 1 was popped');
 
-        @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
-    }
+                @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
+        }
 
-    @include it('Clearing / counting context stacks') {
-        @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
+        @include it('Clearing / counting context stacks') {
+                @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
 
-        @include assert-equal(contexts.push('test', 'ctx', 1234),       'ctx' 1234,       'Check if context 1 was pushed');
-        @include assert-equal(contexts.push('test', 'another', 'text'), 'another' 'text', 'Check if context 2 was pushed');
-        @include assert-equal(contexts.push('test', 'ctx', 56),         'ctx' 56,         'Check if context 3 was pushed');
+                @include assert-equal(contexts.push('test', 'ctx', 1234),       'ctx' 1234,       'Check if context 1 was pushed');
+                @include assert-equal(contexts.push('test', 'another', 'text'), 'another' 'text', 'Check if context 2 was pushed');
+                @include assert-equal(contexts.push('test', 'ctx', 56),         'ctx' 56,         'Check if context 3 was pushed');
 
-        @include assert-equal(contexts.count('test'), 3,    'Check if context stack contains 3 contexts');
-        @include assert-equal(contexts.pop('test'), 'ctx' 56,     'Check if context 3 was popped');
-        @include assert-equal(contexts.count('test'), 2,    'Check if context stack contains 2 contexts');
-        @include assert-equal(contexts.clear('test'), null, 'Check if context stack was cleared');
-        @include assert-equal(contexts.count('test'), 0,    'Check if context stack contains no contexts');
+                @include assert-equal(contexts.count('test'), 3,    'Check if context stack contains 3 contexts');
+                @include assert-equal(contexts.pop('test'), 'ctx' 56,     'Check if context 3 was popped');
+                @include assert-equal(contexts.count('test'), 2,    'Check if context stack contains 2 contexts');
+                @include assert-equal(contexts.clear('test'), null, 'Check if context stack was cleared');
+                @include assert-equal(contexts.count('test'), 0,    'Check if context stack contains no contexts');
 
-        @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
-    }
+                @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
+        }
 
-    @include it('Retrieving contexts') {
-        @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
+        @include it('Retrieving contexts') {
+                @include assert-equal(contexts.create('test'), null, 'Check if context stack was created');
 
-        @include assert-equal(contexts.push('test', 'ctx', 1234),       'ctx' 1234,       'Check if context 1 was pushed');
-        @include assert-equal(contexts.push('test', 'another', 'text'), 'another' 'text', 'Check if context 2 was pushed');
-        @include assert-equal(contexts.push('test', 'ctx', 56),         'ctx' 56,         'Check if context 3 was pushed');
+                @include assert-equal(contexts.push('test', 'ctx', 1234),       'ctx' 1234,       'Check if context 1 was pushed');
+                @include assert-equal(contexts.push('test', 'another', 'text'), 'another' 'text', 'Check if context 2 was pushed');
+                @include assert-equal(contexts.push('test', 'ctx', 56),         'ctx' 56,         'Check if context 3 was pushed');
 
-        @include assert-equal(contexts.get('test', 1),     'ctx' 56,         'Check if context at position 1 is context 3');
-        @include assert-equal(contexts.get('test', 'ctx'), 'ctx' 56,         'Check if latest context with id "ctx" is context 3');
-        @include assert-equal(contexts.get('test', 2),     'another' 'text', 'Check if latest context with id "another" is context 2');
+                @include assert-equal(contexts.get('test', 1),     'ctx' 56,         'Check if context at position 1 is context 3');
+                @include assert-equal(contexts.get('test', 'ctx'), 'ctx' 56,         'Check if latest context with id "ctx" is context 3');
+                @include assert-equal(contexts.get('test', 2),     'another' 'text', 'Check if latest context with id "another" is context 2');
 
-        @include assert-equal(contexts.pop('test'), 'ctx' 56, 'Check if context 3 was popped');
+                @include assert-equal(contexts.pop('test'), 'ctx' 56, 'Check if context 3 was popped');
 
-        @include assert-equal(contexts.get('test', 1),  'another' 'text', 'Check if context at position 1 is context 2');
-        @include assert-equal(contexts.get('test', -1), 'ctx' 1234,       'Check if latest context with id "ctx" is context 1');
+                @include assert-equal(contexts.get('test', 1),  'another' 'text', 'Check if context at position 1 is context 2');
+                @include assert-equal(contexts.get('test', -1), 'ctx' 1234,       'Check if latest context with id "ctx" is context 1');
 
-        @include assert-equal(contexts.push('test', 'more', 'string'), 'more' 'string', 'Check if context 4 was pushed');
+                @include assert-equal(contexts.push('test', 'more', 'string'), 'more' 'string', 'Check if context 4 was pushed');
 
-        @include assert-equal(contexts.get('test', 1),      'more' 'string', 'Check if context at position 1 is context 4');
-        @include assert-equal(contexts.get('test', 'more'), 'more' 'string', 'Check if latest context with id "more" is context 4');
+                @include assert-equal(contexts.get('test', 1),      'more' 'string', 'Check if context at position 1 is context 4');
+                @include assert-equal(contexts.get('test', 'more'), 'more' 'string', 'Check if latest context with id "more" is context 4');
 
-        @include assert-equal(contexts.pop('test'), 'more' 'string',  'Check if context 4 was popped');
-        @include assert-equal(contexts.pop('test'), 'another' 'text', 'Check if context 2 was popped');
+                @include assert-equal(contexts.pop('test'), 'more' 'string',  'Check if context 4 was popped');
+                @include assert-equal(contexts.pop('test'), 'another' 'text', 'Check if context 2 was popped');
 
-        @include assert-equal(contexts.get('test', 1), contexts.get('test', -1), 'Check if first and last context are context 1');
+                @include assert-equal(contexts.get('test', 1), contexts.get('test', -1), 'Check if first and last context are context 1');
 
-        @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
-    }
+                @include assert-equal(contexts.delete('test'), null, 'Check if context stack was deleted');
+        }
 }
diff --git a/test/_functions.scss b/test/_functions.scss
index 07561ef..4d545db 100644
--- a/test/_functions.scss
+++ b/test/_functions.scss
@@ -2,56 +2,56 @@
 @use '../src/functions';
 
 @include describe('functions') {
-    @include it('str-replace') {
-        $str: 'Hello world!';
+        @include it('str-replace') {
+                $str: 'Hello world!';
 
-        @include assert-equal(functions.str-replace($str, 'world', 'neighbor'), 'Hello neighbor!', 'Replace "world" with "neighbor"');
-        @include assert-equal(functions.str-replace($str, 'neighbor', 'moon'),  'Hello world!',    'Replace "neighbor" with "moon"');
-        @include assert-equal(functions.str-replace($str, 'Hello', 'Bye'),      'Bye world!',      'Replace "Hello" with "Bye"');
-    }
+                @include assert-equal(functions.str-replace($str, 'world', 'neighbor'), 'Hello neighbor!', 'Replace "world" with "neighbor"');
+                @include assert-equal(functions.str-replace($str, 'neighbor', 'moon'),  'Hello world!',    'Replace "neighbor" with "moon"');
+                @include assert-equal(functions.str-replace($str, 'Hello', 'Bye'),      'Bye world!',      'Replace "Hello" with "Bye"');
+        }
 
-    @include it('list-slice') {
-        $list: 'this' 'is' 'a' 'list';
+        @include it('list-slice') {
+                $list: 'this' 'is' 'a' 'list';
 
-        @include assert-equal(functions.list-slice($list, 2),      'is' 'a' 'list',  'Discard first item');
-        @include assert-equal(functions.list-slice($list, 1, 3),   'this' 'is' 'a',  'Keep first 3 items');
-        @include assert-equal(functions.list-slice($list, 2, 3),   'is' 'a',         'Extract list from index 2 to 3');
-        @include assert-equal(functions.list-slice($list, -1, -1), join((), 'list'), 'Keep last item');
-        @include assert-equal(functions.list-slice($list, -1, 1),  'list' 'this',    'Extract first and last item');
-    }
+                @include assert-equal(functions.list-slice($list, 2),      'is' 'a' 'list',  'Discard first item');
+                @include assert-equal(functions.list-slice($list, 1, 3),   'this' 'is' 'a',  'Keep first 3 items');
+                @include assert-equal(functions.list-slice($list, 2, 3),   'is' 'a',         'Extract list from index 2 to 3');
+                @include assert-equal(functions.list-slice($list, -1, -1), join((), 'list'), 'Keep last item');
+                @include assert-equal(functions.list-slice($list, -1, 1),  'list' 'this',    'Extract first and last item');
+        }
 
-    @include it('list-prepend') {
-        $list: 'this' 'is' 'a' 'list';
+        @include it('list-prepend') {
+                $list: 'this' 'is' 'a' 'list';
 
-        @include assert-equal(functions.list-prepend($list, 'and'), 'and' 'this' 'is' 'a' 'list', 'Prepend "and"');
-        @include assert-equal(functions.list-prepend($list, 2),     2 'this' 'is' 'a' 'list',     'Prepend 2');
-    }
+                @include assert-equal(functions.list-prepend($list, 'and'), 'and' 'this' 'is' 'a' 'list', 'Prepend "and"');
+                @include assert-equal(functions.list-prepend($list, 2),     2 'this' 'is' 'a' 'list',     'Prepend 2');
+        }
 
-    @include it('quicksort') {
-        @include assert-equal(functions.quicksort(1 2 3 4 5),     1 2 3 4 5,     'Already sorted list of 5 items');
-        @include assert-equal(functions.quicksort(1 3 2),         1 2 3,         'Random list of 3 items');
-        @include assert-equal(functions.quicksort(6 3 7 3 8 1 4), 1 3 3 4 6 7 8, 'Random list of 7 items, one duplicate');
-        @include assert-equal(functions.quicksort(1 1 1 1),       1 1 1 1,       'List of 4 identical items');
-    }
+        @include it('quicksort') {
+                @include assert-equal(functions.quicksort(1 2 3 4 5),     1 2 3 4 5,     'Already sorted list of 5 items');
+                @include assert-equal(functions.quicksort(1 3 2),         1 2 3,         'Random list of 3 items');
+                @include assert-equal(functions.quicksort(6 3 7 3 8 1 4), 1 3 3 4 6 7 8, 'Random list of 7 items, one duplicate');
+                @include assert-equal(functions.quicksort(1 1 1 1),       1 1 1 1,       'List of 4 identical items');
+        }
 
-    @include it('map-get-default') {
-        $map: ('key': 'value', 'another': 'item');
+        @include it('map-get-default') {
+                $map: ('key': 'value', 'another': 'item');
 
-        @include assert-equal(functions.map-get-default($map, 'another', 0),         map-get($map, 'another'), 'Get existing value');
-        @include assert-equal(functions.map-get-default($map, 'index',   'nothing'), 'nothing',                'Get missing value');
-    }
+                @include assert-equal(functions.map-get-default($map, 'another', 0),         map-get($map, 'another'), 'Get existing value');
+                @include assert-equal(functions.map-get-default($map, 'index',   'nothing'), 'nothing',                'Get missing value');
+        }
 
-    @include it('strip-unit') {
-        @include assert-true(unitless(functions.strip-unit(1em)),  'Remove unit from 1em');
-        @include assert-true(unitless(functions.strip-unit(2rem)), 'Remove unit from 2rem');
-        @include assert-true(unitless(functions.strip-unit(3px)),  'Remove unit from 3px');
-        @include assert-true(unitless(functions.strip-unit(4)),    'Remove unit from 4');
-        @include assert-true(unitless(functions.strip-unit(5pt)),  'Remove unit from 5pt');
-    }
+        @include it('strip-unit') {
+                @include assert-true(unitless(functions.strip-unit(1em)),  'Remove unit from 1em');
+                @include assert-true(unitless(functions.strip-unit(2rem)), 'Remove unit from 2rem');
+                @include assert-true(unitless(functions.strip-unit(3px)),  'Remove unit from 3px');
+                @include assert-true(unitless(functions.strip-unit(4)),    'Remove unit from 4');
+                @include assert-true(unitless(functions.strip-unit(5pt)),  'Remove unit from 5pt');
+        }
 
-    @include it('px-to-rem') {
-        @include assert-equal(functions.px-to-rem(16px, 16px), 1rem,   'Convert 16px');
-        @include assert-equal(functions.px-to-rem(32px, 16px), 2rem,   'Convert 16px');
-        @include assert-equal(functions.px-to-rem(8px, 16px),  0.5rem, 'Convert 16px');
-    }
+        @include it('px-to-rem') {
+                @include assert-equal(functions.px-to-rem(16px, 16px), 1rem,   'Convert 16px');
+                @include assert-equal(functions.px-to-rem(32px, 16px), 2rem,   'Convert 16px');
+                @include assert-equal(functions.px-to-rem(8px, 16px),  .5rem, 'Convert 16px');
+        }
 }
diff --git a/test/_gradients.scss b/test/_gradients.scss
index c11439c..db5fda7 100644
--- a/test/_gradients.scss
+++ b/test/_gradients.scss
@@ -5,264 +5,220 @@
 @use '../src/gradients';
 
 @include describe('gradients') {
-    @include it('easing-gradient') {
-        $gradient1: gradients.easing-gradient(
-            linear,
-            to right,
-            #000,
-            ease-in-quad,
-            transparent
-        );
+        @include it('easing-gradient') {
+                $gradient1: gradients.easing-gradient(linear,
+                        to right,
+                        #000,
+                        ease-in-quad,
+                        transparent);
 
-        $expected1: linear-gradient(
-            to right,
-            #000 0,
-            mix(transparent, #000, easing.ease-in-quad(0.25) * 100%) 25%,
-            mix(transparent, #000, easing.ease-in-quad(0.5)  * 100%) 50%,
-            mix(transparent, #000, easing.ease-in-quad(0.75) * 100%) 75%,
-            transparent 100%
-        );
+                $expected1: linear-gradient(to right,
+                        #000 0,
+                        mix(transparent, #000, easing.ease-in-quad(.25) * 100%) 25%,
+                        mix(transparent, #000, easing.ease-in-quad(.5)  * 100%) 50%,
+                        mix(transparent, #000, easing.ease-in-quad(.75) * 100%) 75%,
+                        transparent 100%);
 
-        @include assert-equal($gradient1, $expected1, 'Simple linear gradient');
+                @include assert-equal($gradient1, $expected1, 'Simple linear gradient');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient2: gradients.easing-gradient(
-            radial,
-            1em 2em at 50% 60%,
-            #000,
-            ease-out-cubic,
-            transparent
-        );
+                $gradient2: gradients.easing-gradient(radial,
+                        1em 2em at 50% 60%,
+                        #000,
+                        ease-out-cubic,
+                        transparent);
 
-        $expected2: radial-gradient(
-            1em 2em at 50% 60%,
-            #000 0,
-            mix(transparent, #000, easing.ease-out-cubic(0.25) * 100%) 25%,
-            mix(transparent, #000, easing.ease-out-cubic(0.5)  * 100%) 50%,
-            mix(transparent, #000, easing.ease-out-cubic(0.75) * 100%) 75%,
-            transparent 100%
-        );
+                $expected2: radial-gradient(1em 2em at 50% 60%,
+                        #000 0,
+                        mix(transparent, #000, easing.ease-out-cubic(.25) * 100%) 25%,
+                        mix(transparent, #000, easing.ease-out-cubic(.5)  * 100%) 50%,
+                        mix(transparent, #000, easing.ease-out-cubic(.75) * 100%) 75%,
+                        transparent 100%);
 
-        @include assert-equal($gradient2, $expected2, 'Simple radial gradient');
+                @include assert-equal($gradient2, $expected2, 'Simple radial gradient');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient3: gradients.easing-gradient(
-            linear,
-            to right,
-            #000        2em,
-            ease-in-quad,
-            transparent 10em
-        );
+                $gradient3: gradients.easing-gradient(linear,
+                        to right,
+                        #000        2em,
+                        ease-in-quad,
+                        transparent 10em);
 
-        $expected3: linear-gradient(
-            to right,
-            #000 2em,
-            mix(transparent, #000, easing.ease-in-quad(0.25) * 100%) 4em,
-            mix(transparent, #000, easing.ease-in-quad(0.5)  * 100%) 6em,
-            mix(transparent, #000, easing.ease-in-quad(0.75) * 100%) 8em,
-            transparent 10em
-        );
+                $expected3: linear-gradient(to right,
+                        #000 2em,
+                        mix(transparent, #000, easing.ease-in-quad(.25) * 100%) 4em,
+                        mix(transparent, #000, easing.ease-in-quad(.5)  * 100%) 6em,
+                        mix(transparent, #000, easing.ease-in-quad(.75) * 100%) 8em,
+                        transparent 10em);
 
-        @include assert-equal($gradient3, $expected3, 'Linear gradient with positioned color stops');
+                @include assert-equal($gradient3, $expected3, 'Linear gradient with positioned color stops');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient4: gradients.easing-gradient(
-            linear,
-            to right,
-            #000 20%,
-            ease-in-quad,
-            transparent calc(20% + 10em)
-        );
+                $gradient4: gradients.easing-gradient(linear,
+                        to right,
+                        #000 20%,
+                        ease-in-quad,
+                        transparent calc(20% + 10em));
 
-        $expected4: linear-gradient(
-            to right,
-            #000 20%,
-            mix(transparent, #000, easing.ease-in-quad(0.25) * 100%) calc(20% + (20% + 10em - 20%) * 0.25),
-            mix(transparent, #000, easing.ease-in-quad(0.5)  * 100%) calc(20% + (20% + 10em - 20%) * 0.5),
-            mix(transparent, #000, easing.ease-in-quad(0.75) * 100%) calc(20% + (20% + 10em - 20%) * 0.75),
-            transparent calc(20% + 10em)
-        );
+                $expected4: linear-gradient(to right,
+                        #000 20%,
+                        mix(transparent, #000, easing.ease-in-quad(.25) * 100%) calc(20% + (20% + 10em - 20%) * .25),
+                        mix(transparent, #000, easing.ease-in-quad(.5)  * 100%) calc(20% + (20% + 10em - 20%) * .5),
+                        mix(transparent, #000, easing.ease-in-quad(.75) * 100%) calc(20% + (20% + 10em - 20%) * .75),
+                        transparent calc(20% + 10em));
 
-        @include assert-equal($gradient4, $expected4, 'More advanced linear gradient with positioned color stops');
+                @include assert-equal($gradient4, $expected4, 'More advanced linear gradient with positioned color stops');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient5: gradients.easing-gradient(
-            linear,
-            to right,
-            #000        2em,
-            #f00        7em,
-            ease-in-quad,
-            transparent 10em
-        );
+                $gradient5: gradients.easing-gradient(linear,
+                        to right,
+                        #000        2em,
+                        #f00        7em,
+                        ease-in-quad,
+                        transparent 10em);
 
-        $expected5: linear-gradient(
-            to right,
-            #000 2em,
-            #f00 7em,
-            mix(transparent, #f00, easing.ease-in-quad(0.25) * 100%) 7em + 3em * 0.25,
-            mix(transparent, #f00, easing.ease-in-quad(0.5)  * 100%) 7em + 3em * 0.5,
-            mix(transparent, #f00, easing.ease-in-quad(0.75) * 100%) 7em + 3em * 0.75,
-            transparent 10em
-        );
+                $expected5: linear-gradient(to right,
+                        #000 2em,
+                        #f00 7em,
+                        mix(transparent, #f00, easing.ease-in-quad(.25) * 100%) 7em + 3em * .25,
+                        mix(transparent, #f00, easing.ease-in-quad(.5)  * 100%) 7em + 3em * .5,
+                        mix(transparent, #f00, easing.ease-in-quad(.75) * 100%) 7em + 3em * .75,
+                        transparent 10em);
 
-        @include assert-equal($gradient5, $expected5, 'Linear gradient with 3 positioned color stops, 1 easing transitions');
+                @include assert-equal($gradient5, $expected5, 'Linear gradient with 3 positioned color stops, 1 easing transitions');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient6: gradients.easing-gradient(
-            linear,
-            to right,
-            #000        2em,
-            ease-in-quad,
-            #f00        7em,
-            ease-in-quad,
-            transparent 10em
-        );
+                $gradient6: gradients.easing-gradient(linear,
+                        to right,
+                        #000        2em,
+                        ease-in-quad,
+                        #f00        7em,
+                        ease-in-quad,
+                        transparent 10em);
 
-        $expected6: linear-gradient(
-            to right,
-            #000 2em,
-            mix(#f00,        #000, easing.ease-in-quad(0.25) * 100%) 2em + 5em * 0.25,
-            mix(#f00,        #000, easing.ease-in-quad(0.5)  * 100%) 2em + 5em * 0.5,
-            mix(#f00,        #000, easing.ease-in-quad(0.75) * 100%) 2em + 5em * 0.75,
-            #f00 7em,
-            mix(transparent, #f00, easing.ease-in-quad(0.25) * 100%) 7em + 3em * 0.25,
-            mix(transparent, #f00, easing.ease-in-quad(0.5)  * 100%) 7em + 3em * 0.5,
-            mix(transparent, #f00, easing.ease-in-quad(0.75) * 100%) 7em + 3em * 0.75,
-            transparent 10em
-        );
+                $expected6: linear-gradient(to right,
+                        #000 2em,
+                        mix(#f00, #000, easing.ease-in-quad(.25) * 100%) 2em + 5em * .25,
+                        mix(#f00, #000, easing.ease-in-quad(.5)  * 100%) 2em + 5em * .5,
+                        mix(#f00, #000, easing.ease-in-quad(.75) * 100%) 2em + 5em * .75,
+                        #f00 7em,
+                        mix(transparent, #f00, easing.ease-in-quad(.25) * 100%) 7em + 3em * .25,
+                        mix(transparent, #f00, easing.ease-in-quad(.5)  * 100%) 7em + 3em * .5,
+                        mix(transparent, #f00, easing.ease-in-quad(.75) * 100%) 7em + 3em * .75,
+                        transparent 10em);
 
-        @include assert-equal($gradient6, $expected6, 'Linear gradient with 3 positioned color stops, 2 easing transitions');
+                @include assert-equal($gradient6, $expected6, 'Linear gradient with 3 positioned color stops, 2 easing transitions');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient7: gradients.easing-gradient(
-            linear,
-            to right,
-            #000        2em,
-            ease-in-quad,
-            #f00,
-            ease-in-quad,
-            transparent 10em
-        );
+                $gradient7: gradients.easing-gradient(linear,
+                        to right,
+                        #000        2em,
+                        ease-in-quad,
+                        #f00,
+                        ease-in-quad,
+                        transparent 10em);
 
-        $expected7: linear-gradient(
-            to right,
-            #000 2em,
-            mix(#f00,        #000, easing.ease-in-quad(0.25) * 100%) 2em + 4em * 0.25,
-            mix(#f00,        #000, easing.ease-in-quad(0.5)  * 100%) 2em + 4em * 0.5,
-            mix(#f00,        #000, easing.ease-in-quad(0.75) * 100%) 2em + 4em * 0.75,
-            #f00 6em,
-            mix(transparent, #f00, easing.ease-in-quad(0.25) * 100%) 6em + 4em * 0.25,
-            mix(transparent, #f00, easing.ease-in-quad(0.5)  * 100%) 6em + 4em * 0.5,
-            mix(transparent, #f00, easing.ease-in-quad(0.75) * 100%) 6em + 4em * 0.75,
-            transparent 10em
-        );
+                $expected7: linear-gradient(to right,
+                        #000 2em,
+                        mix(#f00, #000, easing.ease-in-quad(.25) * 100%) 2em + 4em * .25,
+                        mix(#f00, #000, easing.ease-in-quad(.5)  * 100%) 2em + 4em * .5,
+                        mix(#f00, #000, easing.ease-in-quad(.75) * 100%) 2em + 4em * .75,
+                        #f00 6em,
+                        mix(transparent, #f00, easing.ease-in-quad(.25) * 100%) 6em + 4em * .25,
+                        mix(transparent, #f00, easing.ease-in-quad(.5)  * 100%) 6em + 4em * .5,
+                        mix(transparent, #f00, easing.ease-in-quad(.75) * 100%) 6em + 4em * .75,
+                        transparent 10em);
 
-        @include assert-equal($gradient7, $expected7, 'Linear gradient with 2 / 3 positioned color stops, 2 easing transitions');
+                @include assert-equal($gradient7, $expected7, 'Linear gradient with 2 / 3 positioned color stops, 2 easing transitions');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient8: gradients.easing-gradient(
-            linear,
-            to right,
-            #000,
-            ease-in-quad,
-            #f00,
-            ease-in-quad,
-            transparent
-        );
+                $gradient8: gradients.easing-gradient(linear,
+                        to right,
+                        #000,
+                        ease-in-quad,
+                        #f00,
+                        ease-in-quad,
+                        transparent);
 
-        $expected8: linear-gradient(
-            to right,
-            #000 0,
-            mix(#f00,        #000, easing.ease-in-quad(0.25) * 100%) 50% * 0.25,
-            mix(#f00,        #000, easing.ease-in-quad(0.5)  * 100%) 50% * 0.5,
-            mix(#f00,        #000, easing.ease-in-quad(0.75) * 100%) 50% * 0.75,
-            #f00 50%,
-            mix(transparent, #f00, easing.ease-in-quad(0.25) * 100%) 50% + 50% * 0.25,
-            mix(transparent, #f00, easing.ease-in-quad(0.5)  * 100%) 50% + 50% * 0.5,
-            mix(transparent, #f00, easing.ease-in-quad(0.75) * 100%) 50% + 50% * 0.75,
-            transparent 100%
-        );
+                $expected8: linear-gradient(to right,
+                        #000 0,
+                        mix(#f00, #000, easing.ease-in-quad(.25) * 100%) 50% * .25,
+                        mix(#f00, #000, easing.ease-in-quad(.5)  * 100%) 50% * .5,
+                        mix(#f00, #000, easing.ease-in-quad(.75) * 100%) 50% * .75,
+                        #f00 50%,
+                        mix(transparent, #f00, easing.ease-in-quad(.25) * 100%) 50% + 50% * .25,
+                        mix(transparent, #f00, easing.ease-in-quad(.5)  * 100%) 50% + 50% * .5,
+                        mix(transparent, #f00, easing.ease-in-quad(.75) * 100%) 50% + 50% * .75,
+                        transparent 100%);
 
-        @include assert-equal($gradient8, $expected8, 'Linear gradient with 0 / 3 positioned color stops, 2 easing transitions');
+                @include assert-equal($gradient8, $expected8, 'Linear gradient with 0 / 3 positioned color stops, 2 easing transitions');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient9: gradients.easing-gradient(
-            linear,
-            to right,
-            #000,
-            ease-in-quad,
-            #f00,
-            ease-in-quad,
-            transparent 20em
-        );
+                $gradient9: gradients.easing-gradient(linear,
+                        to right,
+                        #000,
+                        ease-in-quad,
+                        #f00,
+                        ease-in-quad,
+                        transparent 20em);
 
-        $expected9: linear-gradient(
-            to right,
-            #000 0,
-            mix(#f00,        #000, easing.ease-in-quad(0.25) * 100%) 10em * 0.25,
-            mix(#f00,        #000, easing.ease-in-quad(0.5)  * 100%) 10em * 0.5,
-            mix(#f00,        #000, easing.ease-in-quad(0.75) * 100%) 10em * 0.75,
-            #f00 10em,
-            mix(transparent, #f00, easing.ease-in-quad(0.25) * 100%) 10em + 10em * 0.25,
-            mix(transparent, #f00, easing.ease-in-quad(0.5)  * 100%) 10em + 10em * 0.5,
-            mix(transparent, #f00, easing.ease-in-quad(0.75) * 100%) 10em + 10em * 0.75,
-            transparent 20em
-        );
+                $expected9: linear-gradient(to right,
+                        #000 0,
+                        mix(#f00, #000, easing.ease-in-quad(.25) * 100%) 10em * .25,
+                        mix(#f00, #000, easing.ease-in-quad(.5)  * 100%) 10em * .5,
+                        mix(#f00, #000, easing.ease-in-quad(.75) * 100%) 10em * .75,
+                        #f00 10em,
+                        mix(transparent, #f00, easing.ease-in-quad(.25) * 100%) 10em + 10em * .25,
+                        mix(transparent, #f00, easing.ease-in-quad(.5)  * 100%) 10em + 10em * .5,
+                        mix(transparent, #f00, easing.ease-in-quad(.75) * 100%) 10em + 10em * .75,
+                        transparent 20em);
 
-        @include assert-equal($gradient9, $expected9, 'Linear gradient with 1 / 3 positioned color stops, 2 easing transitions');
+                @include assert-equal($gradient9, $expected9, 'Linear gradient with 1 / 3 positioned color stops, 2 easing transitions');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient10: gradients.easing-gradient(
-            linear,
-            to right,
-            #000,
-            cubic-bezier 0.47 0 0.745 0.715,
-            transparent
-        );
+                $gradient10: gradients.easing-gradient(linear,
+                        to right,
+                        #000,
+                        cubic-bezier .47 0 .745 .715,
+                        transparent);
 
-        $expected10: linear-gradient(
-            to right,
-            #000 0,
-            mix(transparent, #000, easing.cubic-bezier(0.47, 0, 0.745, 0.715, 0.25) * 100%) 25%,
-            mix(transparent, #000, easing.cubic-bezier(0.47, 0, 0.745, 0.715, 0.5)  * 100%) 50%,
-            mix(transparent, #000, easing.cubic-bezier(0.47, 0, 0.745, 0.715, 0.75) * 100%) 75%,
-            transparent 100%
-        );
+                $expected10: linear-gradient(to right,
+                        #000 0,
+                        mix(transparent, #000, easing.cubic-bezier(.47, 0, .745, .715, .25) * 100%) 25%,
+                        mix(transparent, #000, easing.cubic-bezier(.47, 0, .745, .715, .5)  * 100%) 50%,
+                        mix(transparent, #000, easing.cubic-bezier(.47, 0, .745, .715, .75) * 100%) 75%,
+                        transparent 100%);
 
-        @include assert-equal($gradient10, $expected10, 'Simple linear gradient with custom cubic-bezier easing');
+                @include assert-equal($gradient10, $expected10, 'Simple linear gradient with custom cubic-bezier easing');
 
-        // ---------------------------------------------------------------------------
+                // ---------------------------------------------------------------------------
 
-        $gradient11: gradients.easing-gradient(
-            linear,
-            to right,
-            #000,
-            steps 4 jump-start,
-            transparent
-        );
+                $gradient11: gradients.easing-gradient(linear,
+                        to right,
+                        #000,
+                        steps 4 jump-start,
+                        transparent);
 
-        $expected11: linear-gradient(
-            to right,
-            #000 0,
-            mix(transparent, #000, 0.25 * 100%) 0,
-            mix(transparent, #000, 0.25 * 100%) 25%,
-            mix(transparent, #000, 0.5  * 100%) 25%,
-            mix(transparent, #000, 0.5  * 100%) 50%,
-            mix(transparent, #000, 0.75 * 100%) 50%,
-            mix(transparent, #000, 0.75 * 100%) 75%,
-            transparent 75%,
-            transparent 100%
-        );
+                $expected11: linear-gradient(to right,
+                        #000 0,
+                        mix(transparent, #000, .25 * 100%) 0,
+                        mix(transparent, #000, .25 * 100%) 25%,
+                        mix(transparent, #000, .5  * 100%) 25%,
+                        mix(transparent, #000, .5  * 100%) 50%,
+                        mix(transparent, #000, .75 * 100%) 50%,
+                        mix(transparent, #000, .75 * 100%) 75%,
+                        transparent 75%,
+                        transparent 100%);
 
-        @include assert-equal($gradient11, $expected11, 'Simple linear gradient with custom steps easing');
-    }
+                @include assert-equal($gradient11, $expected11, 'Simple linear gradient with custom steps easing');
+        }
 }
diff --git a/test/_harmony.scss b/test/_harmony.scss
index c7d309c..3229e8e 100644
--- a/test/_harmony.scss
+++ b/test/_harmony.scss
@@ -4,251 +4,251 @@
 @use '../src/harmony';
 
 @function _limit-decimals($n) {
-    @return math.div(math.floor($n * 1000), 1000);
+        @return math.div(math.floor($n * 1000), 1000);
 }
 
 @include describe('harmony') {
-    @include it('modular-scale') {
-        @include assert-equal(_limit-decimals(harmony.modular-scale(0, 1em, 1.1)), 1em,    'Zero iterations, 1em base, 1.1 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(1, 1em, 1.1)), 1.1em,  '1 iteration, 1em base, 1.1 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(2, 2px, 1.2)), 2.88px, '2 iterations, 2px base, 1.2 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(-1, 2rem, 2)), 1rem,   '-1 iteration, 2rem base, 2 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(-2, 2rem, 2)), 0.5rem, '-2 iterations, 2rem base, 2 scale');
+        @include it('modular-scale') {
+                @include assert-equal(_limit-decimals(harmony.modular-scale(0, 1em, 1.1)), 1em,    'Zero iterations, 1em base, 1.1 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(1, 1em, 1.1)), 1.1em,  '1 iteration, 1em base, 1.1 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(2, 2px, 1.2)), 2.88px, '2 iterations, 2px base, 1.2 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(-1, 2rem, 2)), 1rem,   '-1 iteration, 2rem base, 2 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(-2, 2rem, 2)), .5rem, '-2 iterations, 2rem base, 2 scale');
 
-        @include assert-equal(_limit-decimals(harmony.modular-scale(0, 1em 2em, 1.1)), 1em,        'Zero iterations, 1em 2em base, 1.1 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(1, 1em 2em, 1.1)), 1.026em,    '1 iteration, 1em 2em base, 1.1 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(2, 1em 2em, 1.1)), 1.1em,      '2 iterations, 1em 2em base, 1.1 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(-1, 1em 1.5em, 1.2)), 0.868em, '-1 iteration, 1em 2em base, 1.1 scale');
-        @include assert-equal(_limit-decimals(harmony.modular-scale(-2, 1em 1.5em, 1.2)), 0.833em, '-2 iterations, 1em 2em base, 1.1 scale');
-    }
+                @include assert-equal(_limit-decimals(harmony.modular-scale(0, 1em 2em, 1.1)), 1em,        'Zero iterations, 1em 2em base, 1.1 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(1, 1em 2em, 1.1)), 1.026em,    '1 iteration, 1em 2em base, 1.1 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(2, 1em 2em, 1.1)), 1.1em,      '2 iterations, 1em 2em base, 1.1 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(-1, 1em 1.5em, 1.2)), .868em, '-1 iteration, 1em 2em base, 1.1 scale');
+                @include assert-equal(_limit-decimals(harmony.modular-scale(-2, 1em 1.5em, 1.2)), .833em, '-2 iterations, 1em 2em base, 1.1 scale');
+        }
 
-    @include it('responsive-modular-scale') {
-        @include assert('Single-stranded, fluid') {
-            $ms: (
-                320px: (1rem, 1.1),
-                640px: (1rem, 1.2)
-            );
+        @include it('responsive-modular-scale') {
+                @include assert('Single-stranded, fluid') {
+                        $ms: (
+                                320px: (1rem, 1.1),
+                                640px: (1rem, 1.2)
+                        );
 
-            $rem320px:  functions.px-to-rem(320px);
-            $rem640px:  functions.px-to-rem(640px);
-            $diff320px: functions.strip-unit($rem640px - $rem320px);
+                        $rem320px:  functions.px-to-rem(320px);
+                        $rem640px:  functions.px-to-rem(640px);
+                        $diff320px: functions.strip-unit($rem640px - $rem320px);
 
-            @include output {
-                h3 {
-                    @include harmony.responsive-modular-scale(font-size, 0, $ms);
-                }
+                        @include output {
+                                h3 {
+                                        @include harmony.responsive-modular-scale(font-size, 0, $ms);
+                                }
 
-                h2 {
-                    @include harmony.responsive-modular-scale(font-size, 1, $ms);
-                }
+                                h2 {
+                                        @include harmony.responsive-modular-scale(font-size, 1, $ms);
+                                }
 
-                h1 {
-                    @include harmony.responsive-modular-scale(font-size, 2, $ms);
-                }
-            }
+                                h1 {
+                                        @include harmony.responsive-modular-scale(font-size, 2, $ms);
+                                }
+                        }
 
-            @include expect {
-                h3 {
-                    font-size: 1rem;
+                        @include expect {
+                                h3 {
+                                        font-size: 1rem;
 
-                    @media (min-width: 320px) and (max-width: 640px) {
-                        font-size: calc(1rem + 0 * (100vw - #{$rem320px}) / #{$diff320px});
-                    }
+                                        @media (min-width: 320px) and (max-width: 640px) {
+                                                font-size: calc(1rem + 0 * (100vw - #{$rem320px}) / #{$diff320px});
+                                        }
 
-                    @media (min-width: 640px) {
-                        font-size: 1rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1rem;
+                                        }
+                                }
 
-                h2 {
-                    font-size: 1.1rem;
+                                h2 {
+                                        font-size: 1.1rem;
 
-                    @media (min-width: 320px) and (max-width: 640px) {
-                        font-size: calc(1.1rem + 0.1 * (100vw - #{$rem320px}) / #{$diff320px});
-                    }
+                                        @media (min-width: 320px) and (max-width: 640px) {
+                                                font-size: calc(1.1rem + .1 * (100vw - #{$rem320px}) / #{$diff320px});
+                                        }
 
-                    @media (min-width: 640px) {
-                        font-size: 1.2rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.2rem;
+                                        }
+                                }
 
-                h1 {
-                    font-size: 1.21rem;
+                                h1 {
+                                        font-size: 1.21rem;
 
-                    @media (min-width: 320px) and (max-width: 640px) {
-                        font-size: calc(1.21rem + 0.23 * (100vw - #{$rem320px}) / #{$diff320px});
-                    }
+                                        @media (min-width: 320px) and (max-width: 640px) {
+                                                font-size: calc(1.21rem + .23 * (100vw - #{$rem320px}) / #{$diff320px});
+                                        }
 
-                    @media (min-width: 640px) {
-                        font-size: 1.44rem;
-                    }
-                }
-            }
-        }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.44rem;
+                                        }
+                                }
+                        }
+                }
 
-        @include assert('Single-stranded, non-fluid') {
-            $ms: (
-                320px: (1rem, 1.1),
-                640px: (1rem, 1.2)
-            );
+                @include assert('Single-stranded, non-fluid') {
+                        $ms: (
+                                320px: (1rem, 1.1),
+                                640px: (1rem, 1.2)
+                        );
 
-            $rem320px:  functions.px-to-rem(320px);
-            $rem640px:  functions.px-to-rem(640px);
-            $diff320px: functions.strip-unit($rem640px - $rem320px);
+                        $rem320px:  functions.px-to-rem(320px);
+                        $rem640px:  functions.px-to-rem(640px);
+                        $diff320px: functions.strip-unit($rem640px - $rem320px);
 
-            @include output {
-                h3 {
-                    @include harmony.responsive-modular-scale(font-size, 0, $ms, false);
-                }
+                        @include output {
+                                h3 {
+                                        @include harmony.responsive-modular-scale(font-size, 0, $ms, false);
+                                }
 
-                h2 {
-                    @include harmony.responsive-modular-scale(font-size, 1, $ms, false);
-                }
+                                h2 {
+                                        @include harmony.responsive-modular-scale(font-size, 1, $ms, false);
+                                }
 
-                h1 {
-                    @include harmony.responsive-modular-scale(font-size, 2, $ms, false);
-                }
-            }
+                                h1 {
+                                        @include harmony.responsive-modular-scale(font-size, 2, $ms, false);
+                                }
+                        }
 
-            @include expect {
-                h3 {
-                    font-size: 1rem;
+                        @include expect {
+                                h3 {
+                                        font-size: 1rem;
 
-                    @media (min-width: 640px) {
-                        font-size: 1rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1rem;
+                                        }
+                                }
 
-                h2 {
-                    font-size: 1.1rem;
+                                h2 {
+                                        font-size: 1.1rem;
 
-                    @media (min-width: 640px) {
-                        font-size: 1.2rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.2rem;
+                                        }
+                                }
 
-                h1 {
-                    font-size: 1.21rem;
+                                h1 {
+                                        font-size: 1.21rem;
 
-                    @media (min-width: 640px) {
-                        font-size: 1.44rem;
-                    }
-                }
-            }
-        }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.44rem;
+                                        }
+                                }
+                        }
+                }
 
-        @include assert('Double-stranded, fluid') {
-            $ms: (
-                320px: (1rem 2rem, 1.1),
-                640px: (1rem 2rem, 1.2)
-            );
+                @include assert('Double-stranded, fluid') {
+                        $ms: (
+                                320px: (1rem 2rem, 1.1),
+                                640px: (1rem 2rem, 1.2)
+                        );
 
-            $rem320px:  functions.px-to-rem(320px);
-            $rem640px:  functions.px-to-rem(640px);
-            $diff320px: functions.strip-unit($rem640px - $rem320px);
+                        $rem320px:  functions.px-to-rem(320px);
+                        $rem640px:  functions.px-to-rem(640px);
+                        $diff320px: functions.strip-unit($rem640px - $rem320px);
 
-            @include output {
-                h3 {
-                    @include harmony.responsive-modular-scale(font-size, 0, $ms);
-                }
+                        @include output {
+                                h3 {
+                                        @include harmony.responsive-modular-scale(font-size, 0, $ms);
+                                }
 
-                h2 {
-                    @include harmony.responsive-modular-scale(font-size, 1, $ms);
-                }
+                                h2 {
+                                        @include harmony.responsive-modular-scale(font-size, 1, $ms);
+                                }
 
-                h1 {
-                    @include harmony.responsive-modular-scale(font-size, 2, $ms);
-                }
-            }
+                                h1 {
+                                        @include harmony.responsive-modular-scale(font-size, 2, $ms);
+                                }
+                        }
 
-            @include expect {
-                h3 {
-                    font-size: 1rem;
+                        @include expect {
+                                h3 {
+                                        font-size: 1rem;
 
-                    @media (min-width: 320px) and (max-width: 640px) {
-                        font-size: calc(1rem + 0 * (100vw - #{$rem320px}) / #{$diff320px});
-                    }
+                                        @media (min-width: 320px) and (max-width: 640px) {
+                                                font-size: calc(1rem + 0 * (100vw - #{$rem320px}) / #{$diff320px});
+                                        }
 
-                    @media (min-width: 640px) {
-                        font-size: 1rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1rem;
+                                        }
+                                }
 
-                h2 {
-                    font-size: 1.0263162365rem;
+                                h2 {
+                                        font-size: 1.0263162365rem;
 
-                    @media (min-width: 320px) and (max-width: 640px) {
-                        font-size: calc(1.0263162365rem + 0.1310911709 * (100vw - #{$rem320px}) / #{$diff320px});
-                    }
+                                        @media (min-width: 320px) and (max-width: 640px) {
+                                                font-size: calc(1.0263162365rem + .1310911709 * (100vw - #{$rem320px}) / #{$diff320px});
+                                        }
 
-                    @media (min-width: 640px) {
-                        font-size: 1.1574074074rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.1574074074rem;
+                                        }
+                                }
 
-                h1 {
-                    font-size: 1.1rem;
+                                h1 {
+                                        font-size: 1.1rem;
 
-                    @media (min-width: 320px) and (max-width: 640px) {
-                        font-size: calc(1.1rem + 0.1 * (100vw - #{$rem320px}) / #{$diff320px});
-                    }
+                                        @media (min-width: 320px) and (max-width: 640px) {
+                                                font-size: calc(1.1rem + .1 * (100vw - #{$rem320px}) / #{$diff320px});
+                                        }
 
-                    @media (min-width: 640px) {
-                        font-size: 1.2rem;
-                    }
-                }
-            }
-        }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.2rem;
+                                        }
+                                }
+                        }
+                }
 
-        @include assert('Double-stranded, non-fluid') {
-            $ms: (
-                320px: (1rem 2rem, 1.1),
-                640px: (1rem 2rem, 1.2)
-            );
+                @include assert('Double-stranded, non-fluid') {
+                        $ms: (
+                                320px: (1rem 2rem, 1.1),
+                                640px: (1rem 2rem, 1.2)
+                        );
 
-            $rem320px:  functions.px-to-rem(320px);
-            $rem640px:  functions.px-to-rem(640px);
-            $diff320px: functions.strip-unit($rem640px - $rem320px);
+                        $rem320px:  functions.px-to-rem(320px);
+                        $rem640px:  functions.px-to-rem(640px);
+                        $diff320px: functions.strip-unit($rem640px - $rem320px);
 
-            @include output {
-                h3 {
-                    @include harmony.responsive-modular-scale(font-size, 0, $ms, false);
-                }
+                        @include output {
+                                h3 {
+                                        @include harmony.responsive-modular-scale(font-size, 0, $ms, false);
+                                }
 
-                h2 {
-                    @include harmony.responsive-modular-scale(font-size, 1, $ms, false);
-                }
+                                h2 {
+                                        @include harmony.responsive-modular-scale(font-size, 1, $ms, false);
+                                }
 
-                h1 {
-                    @include harmony.responsive-modular-scale(font-size, 2, $ms, false);
-                }
-            }
+                                h1 {
+                                        @include harmony.responsive-modular-scale(font-size, 2, $ms, false);
+                                }
+                        }
 
-            @include expect {
-                h3 {
-                    font-size: 1rem;
+                        @include expect {
+                                h3 {
+                                        font-size: 1rem;
 
-                    @media (min-width: 640px) {
-                        font-size: 1rem;
-                    }
-                }
+                                        @media (min-width: 640px) {
+                                                font-size: 1rem;
+                                        }
+                                }
 
-                h2 {
-                    font-size: 1.0263162365rem;;
+                                h2 {
+                                        font-size: 1.0263162365rem;
 
-                    @media (min-width: 640px) {
-                        font-size: 1.1574074074rem;;
-                    }
-                }
+                                        @media                                          (min-width: 640px) {
+                                                font-size: 1.1574074074rem;;
+                                        }
+                                }
 
-                h1 {
-                    font-size: 1.1rem;
+                                h1 {
+                                        font-size: 1.1rem;
 
-                    @media (min-width: 640px) {
-                        font-size: 1.2rem;
-                    }
-                }
-            }
-        }
-    }
+                                        @media (min-width: 640px) {
+                                                font-size: 1.2rem;
+                                        }
+                                }
+                        }
+                }
+        }
 }
diff --git a/test/_props.scss b/test/_props.scss
index d8b550b..f8c85ee 100644
--- a/test/_props.scss
+++ b/test/_props.scss
@@ -6,290 +6,273 @@
 @use '../src/props';
 
 @include describe('Property trees') {
-    @include it('Validate names') {
-        $map-valid: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                )
-            )
-        );
+        @include it('Save / Delete') {
+                $map: (
+                        --background: #fff,
+                        --text:       #000,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                )
+                        )
+                );
 
-        $map-invalid: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    background: #f00,
-                    text:       #fff
-                )
-            )
-        );
+                @include assert-equal(props.store($map), null, 'Save default tree');
+                @include assert-equal(props.clear(),     null, 'Delete default tree');
+        }
 
-        @include assert-equal(props.validate($map-valid),   true,  'Check valid map');
-        @include assert-equal(props.validate($map-invalid), false, 'Check invalid map');
-    }
+        @include it('Read') {
+                $map1: (
+                        --background: #fff,
+                        --text:       #000,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                )
+                        )
+                );
 
-    @include it('Save / Delete') {
-        $map: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                )
-            )
-        );
+                $map2: (
+                        --background: #222,
+                        --text:       #fff,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                )
+                        )
+                );
 
-        @include assert-equal(props.store($map), null, 'Save default tree');
-        @include assert-equal(props.clear(),     null, 'Delete default tree');
-    }
+                $map3: (
+                        --background: #666,
+                        --text:       #222,
+                        --buttons: (
+                                --primary: (
+                                        --background: #0f0,
+                                        --text:       #000
+                                )
+                        )
+                );
 
-    @include it('Read') {
-        $map1: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                )
-            )
-        );
+                @include assert-equal(props.store($map1),         null,  'Save default tree');
+                @include assert-equal(props.store($map2, 'test'), null,  'Save "test" tree');
 
-        $map2: (
-            --background: #222,
-            --text:       #fff,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                )
-            )
-        );
+                @include props.namespace('ns') {
+                        @include assert-equal(props.store($map3, 'namespaced'), null,  'Save "namespaced" tree');
+                }
 
-        $map3: (
-            --background: #666,
-            --text:       #222,
-            --buttons: (
-                --primary: (
-                    --background: #0f0,
-                    --text:       #000
-                )
-            )
-        );
+                @include assert-equal(props.get-static(--background),                     map.get($map1, --background),                       'Get --background in default');
+                @include assert-equal(props.get-static(--buttons --primary --background), map.get($map1, --buttons, --primary, --background), 'Get --buttons --primary --background in default');
+                @include assert-equal(props.get-static(--box, $default: false),           false,                                              'Get nonexistent in default');
 
-        @include assert-equal(props.store($map1),         null,  'Save default tree');
-        @include assert-equal(props.store($map2, 'test'), null,  'Save "test" tree');
+                @include assert-equal(props.get-static(--background, 'test'),                     map.get($map2, --background),                       'Get --background in "test"');
+                @include assert-equal(props.get-static(--buttons --primary --background, 'test'), map.get($map2, --buttons, --primary, --background), 'Get --buttons --primary --background in "test"');
+                @include assert-equal(props.get-static(--box, 'test', $default: false),           false,                                              'Get nonexistent in "test"');
+                
+                @include assert-equal(props.get-static(--background,      'namespaced', $default: false), false,                        'Get --background in "namespaced"');
+                @include assert-equal(props.get-static(--ns --background, 'namespaced'),                  map.get($map3, --background), 'Get --ns --background in "namespaced"');
+                @include props.namespace('ns') {
+                        @include assert-equal(props.get-static(--background, 'namespaced'),                     map.get($map3, --background),                       'Get namespaced --background in "namespaced"');
+                        @include assert-equal(props.get-static(--buttons --primary --background, 'namespaced'), map.get($map3, --buttons, --primary, --background), 'Get namespaced --buttons --primary --background in "namespaced"');
+                        @include assert-equal(props.get-static(--box, 'namespaced', $default: false),           false,                                              'Get namespaced nonexistent in "namespaced"');
+                }
 
-        @include props.namespace('ns') {
-            @include assert-equal(props.store($map3, 'namespaced'), null,  'Save "namespaced" tree');
-        }
+                @include assert-equal(props.clear(),             null, 'Delete default tree');
+                @include assert-equal(props.clear('test'),       null, 'Delete "test" tree');
+                @include assert-equal(props.clear('namespaced'), null, 'Delete "namespaced" tree');
+        }
 
-        @include assert-equal(props.get-static(--background),                     map-get($map1, --background),                       'Get --background in default');
-        @include assert-equal(props.get-static(--buttons --primary --background), map-get($map1, --buttons, --primary, --background), 'Get --buttons --primary --background in default');
-        @include assert-equal(props.get-static(--box, $default: false),           false,                                              'Get nonexistent in default');
+        @include it('Overwrite') {
+                $map1: (
+                        --background: #fff,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                )
+                        )
+                );
 
-        @include assert-equal(props.get-static(--background, 'test'),                     map-get($map2, --background),                       'Get --background in "test"');
-        @include assert-equal(props.get-static(--buttons --primary --background, 'test'), map-get($map2, --buttons, --primary, --background), 'Get --buttons --primary --background in "test"');
-        @include assert-equal(props.get-static(--box, 'test', $default: false),           false,                                              'Get nonexistent in "test"');
-        
-        @include assert-equal(props.get-static(--background,      'namespaced', $default: false), false,                        'Get --background in "namespaced"');
-        @include assert-equal(props.get-static(--ns --background, 'namespaced'),                  map-get($map3, --background), 'Get --ns --background in "namespaced"');
-        @include props.namespace('ns') {
-            @include assert-equal(props.get-static(--background, 'namespaced'),                     map-get($map3, --background),                       'Get namespaced --background in "namespaced"');
-            @include assert-equal(props.get-static(--buttons --primary --background, 'namespaced'), map-get($map3, --buttons, --primary, --background), 'Get namespaced --buttons --primary --background in "namespaced"');
-            @include assert-equal(props.get-static(--box, 'namespaced', $default: false),           false,                                              'Get namespaced nonexistent in "namespaced"');
-        }
+                $map2: (
+                        --background: #eee,
+                        --text:       #000,
+                        --buttons: (
+                                --primary: (
+                                        --background: #00f
+                                )
+                        )
+                );
 
-        @include assert-equal(props.clear(),             null, 'Delete default tree');
-        @include assert-equal(props.clear('test'),       null, 'Delete "test" tree');
-        @include assert-equal(props.clear('namespaced'), null, 'Delete "namespaced" tree');
-    }
+                @include assert-equal(props.store($map1),               null, 'Save default tree');
+                @include assert-equal(props.store($map2, $merge: true), null, 'Overwrite default tree');
 
-    @include it('Overwrite') {
-        $map1: (
-            --background: #fff,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                )
-            )
-        );
+                @include assert-equal(props.get-static(),                           map.deep-merge($map1, $map2),                 'After update, get whole map');
+                @include assert-equal(props.get-static(--background),               map.get($map2, --background),                 'After update, get --background');
+                @include assert-equal(props.get-static(--text),                     map.get($map2, --text),                       'After update, get --text');
+                @include assert-equal(props.get-static(--buttons --primary --text), map.get($map1, --buttons, --primary, --text), 'After update, get --buttons --primary --text');
 
-        $map2: (
-            --background: #eee,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #00f
-                )
-            )
-        );
+                @include assert-equal(props.clear(), null, 'Delete default tree');
+        }
 
-        @include assert-equal(props.store($map1),               null, 'Save default tree');
-        @include assert-equal(props.store($map2, $merge: true), null, 'Overwrite default tree');
+        @include it('Native assignment') {
+                $map: (
+                        --background: #fff,
+                        --text:       #000,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                ),
+                                --default: (
+                                        --background: #ddd,
+                                        --text:       #000
+                                )
+                        )
+                );
 
-        @include assert-equal(props.get-static(),                           map.deep-merge($map1, $map2),                 'After update, get whole map');
-        @include assert-equal(props.get-static(--background),               map-get($map2, --background),                 'After update, get --background');
-        @include assert-equal(props.get-static(--text),                     map-get($map2, --text),                       'After update, get --text');
-        @include assert-equal(props.get-static(--buttons --primary --text), map-get($map1, --buttons, --primary, --text), 'After update, get --buttons --primary --text');
+                @include assert('Simple') {
+                        @include props.store($map);
 
-        @include assert-equal(props.clear(), null, 'Delete default tree');
-    }
+                        @include output {
+                                @include props.assign;
+                        }
 
-    @include it('Native assignment') {
-        $map: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                ),
-                --default: (
-                    --background: #ddd,
-                    --text:       #000
-                )
-            )
-        );
+                        @include expect {
+                                --background:                   #{map.get($map, --background)};
+                                --text:                         #{map.get($map, --text)};
+                                --buttons--primary--background: #{map.get($map, --buttons, --primary, --background)};
+                                --buttons--primary--text:       #{map.get($map, --buttons, --primary, --text)};
+                                --buttons--default--background: #{map.get($map, --buttons, --default, --background)};
+                                --buttons--default--text:       #{map.get($map, --buttons, --default, --text)};
+                        }
 
-        @include assert('Simple') {
-            @include props.store($map);
+                        @include props.clear;
+                }
 
-            @include output {
-                @include props.assign;
-            }
+                @include assert('Filtered') {
+                        @include props.store($map);
 
-            @include expect {
-                --background:                   #{map-get($map, --background)};
-                --text:                         #{map-get($map, --text)};
-                --buttons--primary--background: #{map-get($map, --buttons, --primary, --background)};
-                --buttons--primary--text:       #{map-get($map, --buttons, --primary, --text)};
-                --buttons--default--background: #{map-get($map, --buttons, --default, --background)};
-                --buttons--default--text:       #{map-get($map, --buttons, --default, --text)};
-            }
+                        @include output {
+                                @include props.assign($skip: --buttons);
+                        }
 
-            @include props.clear;
-        }
+                        @include expect {
+                                --background: #{map.get($map, --background)};
+                                --text:       #{map.get($map, --text)};
+                        }
 
-        @include assert('Filtered') {
-            @include props.store($map);
+                        @include props.clear;
+                }
 
-            @include output {
-                @include props.assign($skip: --buttons);
-            }
+                @include assert('Namespaced') {
+                        @include props.namespace('ns') {
+                                @include props.store($map);
+                        }
 
-            @include expect {
-                --background: #{map-get($map, --background)};
-                --text:       #{map-get($map, --text)};
-            }
+                        @include output {
+                                @include props.assign;
+                        }
 
-            @include props.clear;
-        }
+                        @include expect {
+                                --ns--background:                   #{map.get($map, --background)};
+                                --ns--text:                         #{map.get($map, --text)};
+                                --ns--buttons--primary--background: #{map.get($map, --buttons, --primary, --background)};
+                                --ns--buttons--primary--text:       #{map.get($map, --buttons, --primary, --text)};
+                                --ns--buttons--default--background: #{map.get($map, --buttons, --default, --background)};
+                                --ns--buttons--default--text:       #{map.get($map, --buttons, --default, --text)};
+                        }
 
-        @include assert('Namespaced') {
-            @include props.namespace('ns') {
-                @include props.store($map);
-            }
+                        @include props.clear;
+                }
+        }
 
-            @include output {
-                @include props.assign;
-            }
+        @include it('Native get') {
+                $map: (
+                        --background: #fff,
+                        --text:       #000,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                ),
+                                --default: (
+                                        --background: #ddd,
+                                        --text:       #000
+                                )
+                        )
+                );
 
-            @include expect {
-                --ns--background:                   #{map-get($map, --background)};
-                --ns--text:                         #{map-get($map, --text)};
-                --ns--buttons--primary--background: #{map-get($map, --buttons, --primary, --background)};
-                --ns--buttons--primary--text:       #{map-get($map, --buttons, --primary, --text)};
-                --ns--buttons--default--background: #{map-get($map, --buttons, --default, --background)};
-                --ns--buttons--default--text:       #{map-get($map, --buttons, --default, --text)};
-            }
+                @include assert-equal(props.store($map), null, 'Save default tree');
 
-            @include props.clear;
-        }
-    }
+                @include assert-equal(props.get(--background),                                  var(--background),                      'Get --background');
+                @include assert-equal(props.get(--buttons --primary --text),                    var(--buttons--primary--text),          'Get --buttons --primary --text');
+                @include assert-equal(props.get(--buttons --secondary --text, $default: false), var(--buttons--secondary--text, false), 'Get --buttons --secondary --text with default');
+                @include props.namespace('buttons') {
+                        @include assert-equal(props.get(--primary --text),                    var(--buttons--primary--text),          'Get via namespace "buttons" --primary --text');
+                        @include assert-equal(props.get(--secondary --text, $default: false), var(--buttons--secondary--text, false), 'Get via namespace "buttons" --secondary --text with default');
+                }
+                @include assert-equal(props.get(--buttons), (
+                        --primary: (
+                                --background: var(--buttons--primary--background),
+                                --text:       var(--buttons--primary--text)
+                        ),
+                        --default: (
+                                --background: var(--buttons--default--background),
+                                --text:       var(--buttons--default--text)
+                        )
+                ), 'Get --buttons recursively');
 
-    @include it('Native get') {
-        $map: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                ),
-                --default: (
-                    --background: #ddd,
-                    --text:       #000
-                )
-            )
-        );
+                @include assert-equal(props.clear(), null, 'Delete default tree');
+        }
 
-        @include assert-equal(props.store($map), null, 'Save default tree');
+        @include it('References') {
+                $map1: (
+                        --background: #fff,
+                        --text:       #000,
+                        --buttons: (
+                                --primary: (
+                                        --background: #f00,
+                                        --text:       #fff
+                                )
+                        )
+                );
 
-        @include assert-equal(props.get(--background),                                  var(--background),                      'Get --background');
-        @include assert-equal(props.get(--buttons --primary --text),                    var(--buttons--primary--text),          'Get --buttons --primary --text');
-        @include assert-equal(props.get(--buttons --secondary --text, $default: false), var(--buttons--secondary--text, false), 'Get --buttons --secondary --text with default');
-        @include props.namespace('buttons') {
-            @include assert-equal(props.get(--primary --text),                    var(--buttons--primary--text),          'Get via namespace "buttons" --primary --text');
-            @include assert-equal(props.get(--secondary --text, $default: false), var(--buttons--secondary--text, false), 'Get via namespace "buttons" --secondary --text with default');
-        }
+                $map2: (
+                        --background: #eee,
+                        --buttons: (
+                                --primary: (
+                                        --background: props.ref($key: --background)
+                                ),
+                                --default: props.ref($key: --buttons --primary)
+                        )
+                );
 
-        @include assert-equal(props.clear(), null, 'Delete default tree');
-    }
+                @include assert-equal(props.store($map1),           null, 'Save default tree');
+                @include assert-equal(props.store($map2, 'second'), null, 'Save "second" tree');
 
-    @include it('References') {
-        $map1: (
-            --background: #fff,
-            --text:       #000,
-            --buttons: (
-                --primary: (
-                    --background: #f00,
-                    --text:       #fff
-                )
-            )
-        );
+                @include assert-equal(props.get-static(--buttons --primary --background, 'second'), map.get($map1, --background),        'Get referenced value');
+                @include assert-equal(props.get(--buttons --primary --background, 'second'),        var(--buttons--primary--background), 'Get referenced value, native');
 
-        $map2: (
-            --background: #eee,
-            --buttons: (
-                --primary: (
-                    --background: props.ref($key: --background)
-                ),
-                --default: props.ref($key: --buttons --primary)
-            )
-        );
+                @include assert-equal(props.get-static(--buttons --default, 'second'),              map.get($map1, --buttons, --primary),               'Get referenced subtree, whole');
+                @include assert-equal(props.get-static(--buttons --default --background, 'second'), map.get($map1, --buttons, --primary, --background), 'Get referenced subtree, inner value');
+                @include assert-equal(props.get(--buttons --default --background, 'second'),        var(--buttons--default--background),                'Get referenced subtree, native');
+                
+                @include assert('Native assignment') {
+                        @include output {
+                                @include props.assign('second');
+                        }
 
-        @include assert-equal(props.store($map1),           null, 'Save default tree');
-        @include assert-equal(props.store($map2, 'second'), null, 'Save "second" tree');
+                        @include expect {
+                                --background:                   #{map.get($map2, --background)};
+                                --buttons--primary--background: #{map.get($map1, --background)};
+                                --buttons--default--background: #{map.get($map1, --buttons, --primary, --background)};
+                                --buttons--default--text:       #{map.get($map1, --buttons, --primary, --text)};
+                        }
+                }
 
-        @include assert-equal(props.get-static(--buttons --primary --background, 'second'), map-get($map1, --background),        'Get referenced value');
-        @include assert-equal(props.get(--buttons --primary --background, 'second'),        var(--buttons--primary--background), 'Get referenced value, native');
-
-        @include assert-equal(props.get-static(--buttons --default, 'second'),              map-get($map1, --buttons, --primary),               'Get referenced subtree, whole');
-        @include assert-equal(props.get-static(--buttons --default --background, 'second'), map-get($map1, --buttons, --primary, --background), 'Get referenced subtree, inner value');
-        @include assert-equal(props.get(--buttons --default --background, 'second'),        var(--buttons--default--background),                'Get referenced subtree, native');
-        
-        @include assert('Native assignment') {
-            @include output {
-                @include props.assign('second');
-            }
-
-            @include expect {
-                --background:                   #{map-get($map2, --background)};
-                --buttons--primary--background: #{map-get($map1, --background)};
-                --buttons--default--background: #{map-get($map1, --buttons, --primary, --background)};
-                --buttons--default--text:       #{map-get($map1, --buttons, --primary, --text)};
-            }
-        }
-
-        @include assert-equal(props.clear(),         null, 'Delete default tree');
-        @include assert-equal(props.clear('second'), null, 'Delete "second" tree');
-    }
+                @include assert-equal(props.clear(),         null, 'Delete default tree');
+                @include assert-equal(props.clear('second'), null, 'Delete "second" tree');
+        }
 }
diff --git a/test/_responsive.scss b/test/_responsive.scss
index 6780ae6..aa76cfd 100644
--- a/test/_responsive.scss
+++ b/test/_responsive.scss
@@ -3,11 +3,11 @@
 @use '../src/responsive';
 
 @include describe('responsive') {
-    @include it('fluid-calc') {
-        $rem600px: functions.px-to-rem(600px);
-        $rem800px: functions.px-to-rem(800px);
+        @include it('fluid-calc') {
+                $rem600px: functions.px-to-rem(600px);
+                $rem800px: functions.px-to-rem(800px);
 
-        @include assert-equal('#{responsive.fluid-calc(2rem, 4rem, 600px, 800px)}', 'calc(2rem + 2 * (100vw - #{$rem600px}) / #{functions.strip-unit($rem800px - $rem600px)})', 'Responsive value from 2rem to 4rem over 600px to 800px');
-        @include assert-equal('#{responsive.fluid-calc(4px, 12px, 600px, 800px)}',  'calc(4px + 8 * (100vw - 600px) / 200)',  'Responsive value from 4px to 12px over 600px to 800px');
-    }
+                @include assert-equal('#{responsive.fluid-calc(2rem, 4rem, 600px, 800px)}', 'calc(2rem + 2 * (100vw - #{$rem600px}) / #{functions.strip-unit($rem800px - $rem600px)})', 'Responsive value from 2rem to 4rem over 600px to 800px');
+                @include assert-equal('#{responsive.fluid-calc(4px, 12px, 600px, 800px)}',  'calc(4px + 8 * (100vw - 600px) / 200)',  'Responsive value from 4px to 12px over 600px to 800px');
+        }
 }
diff --git a/test/bem/_at-theme.scss b/test/bem/_at-theme.scss
index 29a4eba..83ea4d1 100644
--- a/test/bem/_at-theme.scss
+++ b/test/bem/_at-theme.scss
@@ -10,49 +10,49 @@
 //
 
 @include it('at-theme') {
-    @include assert('single theme') { /// 1 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.at-theme('theme') {
-                    font-size: 2em;
-                }
-            }
-        }
+        @include assert('single theme') { /// 1 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.at-theme('theme') {
+                                        font-size: 2em;
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .t-theme .something,
-            [class*=' t-'] .t-theme .something,
-            [class^='t-'] .t-theme .something {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect(false) {
+                        .t-theme .something,
+                        [class*=' t-'] .t-theme .something,
+                        [class^='t-'] .t-theme .something {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('with sub-theme') { /// 2 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.at-theme('theme') {
-                    font-size: 2em;
-                }
+        @include assert('with sub-theme') { /// 2 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.at-theme('theme') {
+                                        font-size: 2em;
+                                }
 
-                @include bem.at-theme('theme', 'subtheme') {
-                    font-size: 3em;
-                }
-            }
-        }
+                                @include bem.at-theme('theme', 'subtheme') {
+                                        font-size: 3em;
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .t-theme .something,
-            [class*=' t-'] .t-theme .something,
-            [class^='t-'] .t-theme .something {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .t-theme .something,
+                        [class*=' t-'] .t-theme .something,
+                        [class^='t-'] .t-theme .something {
+                                font-size: 2em;
+                        }
 
-            .t-theme .t-subtheme .something,
-            [class*=' t-'] .t-theme .t-subtheme .something,
-            [class^='t-'] .t-theme .t-subtheme .something {
-                font-size: 3em;
-            }
-        }
-    }
+                        .t-theme .t-subtheme .something,
+                        [class*=' t-'] .t-theme .t-subtheme .something,
+                        [class^='t-'] .t-theme .t-subtheme .something {
+                                font-size: 3em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_block.scss b/test/bem/_block.scss
index fb3a545..e883567 100644
--- a/test/bem/_block.scss
+++ b/test/bem/_block.scss
@@ -1,5 +1,6 @@
 // sass-lint:disable class-name-format force-element-nesting force-pseudo-nesting mixins-before-declarations
 
+@use 'sass:map';
 @use 'true' as *;
 @use '../../src/bem';
 
@@ -12,77 +13,83 @@
 //
 
 @include it('block') {
-    @include assert('without namespace') { /// 1 ///
-        @include output(false) {
-            @include bem.block('something') {
-                font-size: 1em;
-            }
-        }
+        @include assert('without namespace') { /// 1 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                font-size: 1em;
+                        }
+                }
 
-        @include expect(false) {
-            .something {
-                font-size: 1em;
-            }
-        }
-    }
+                @include expect(false) {
+                        .something {
+                                font-size: 1em;
+                        }
+                }
+        }
 
-    @each $ns in map-keys(bem.$namespaces) {
-        @include assert('with namespace "#{$ns}"') { /// 2 ///
-            @include output(false) {
-                @include bem.block('something', $ns) {
-                    font-size: 1em;
-                }
-            }
+        @each $ns in map.keys(bem.$namespaces) {
+                @include assert('with namespace "#{$ns}"') { /// 2 ///
+                        @include output(false) {
+                                @include bem.block('something', $ns) {
+                                        font-size: 1em;
+                                }
+                        }
 
-            @include expect(false) {
-                @if $ns != 'theme' {
-                    .#{map-get(bem.$namespaces, $ns)}-something {
-                        font-size: 1em;
-                    }
-                } @else {
-                    .t-something,
-                    [class*=' t-'] .t-something,
-                    [class^='t-'] .t-something {
-                        font-size: 1em;
-                    }
-                }
-            }
-        }
-    }
+                        @include expect(false) {
+                                @layer #{$ns} {
+                                        @if $ns != 'theme' {
+                                                .#{map-get(bem.$namespaces, $ns)}-something {
+                                                        font-size: 1em;
+                                                }
+                                        } @else {
+                                                .t-something,
+                                                [class*=' t-'] .t-something,
+                                                [class^='t-'] .t-something {
+                                                        font-size: 1em;
+                                                }
+                                        }
+                                }
+                        }
+                }
+        }
 
-    @include assert('nested') { /// 3 ///
-        @include output(false) {
-            @include bem.theme('theme') {
-                @include bem.theme('subtheme') {
-                    @include bem.block('something') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('nested') { /// 3 ///
+                @include output(false) {
+                        @include bem.theme('theme') {
+                                @include bem.theme('subtheme') {
+                                        @include bem.block('something') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .t-theme .t-subtheme .something,
-            [class*=' t-'] .t-theme .t-subtheme .something,
-            [class^='t-'] .t-theme .t-subtheme .something {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect(false) {
+                        @layer theme {
+                                @layer theme {
+                                        .t-theme .t-subtheme .something,
+                                        [class*=' t-'] .t-theme .t-subtheme .something,
+                                        [class^='t-'] .t-theme .t-subtheme .something {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
+        }
 
-    @include assert('within selector') { /// 4 ///
-        @include output(false) {
-            .sel {
-                @include bem.block('something') {
-                    font-size: 2em;
-                }
-            }
-        }
+        @include assert('within selector') { /// 4 ///
+                @include output(false) {
+                        .sel {
+                                @include bem.block('something') {
+                                        font-size: 2em;
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .sel .something {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect(false) {
+                        .sel .something {
+                                font-size: 2em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_composed-of.scss b/test/bem/_composed-of.scss
index fcbf2c4..6a5f4ba 100644
--- a/test/bem/_composed-of.scss
+++ b/test/bem/_composed-of.scss
@@ -1,5 +1,6 @@
 // sass-lint:disable class-name-format force-element-nesting force-pseudo-nesting mixins-before-declarations
 
+@use 'sass:map';
 @use 'true' as *;
 @use '../../src/bem';
 
@@ -12,141 +13,151 @@
 //
 
 @include it('composed-of') {
-    @include assert('without namespace, single') { /// 1 ///
-        @include output(false) {
-            @include bem.block('something') {
-                font-size: 1em;
-            }
+        @include assert('without namespace, single') { /// 1 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                font-size: 1em;
+                        }
 
-            @include bem.block('another') {
-                @include bem.composed-of('something');
+                        @include bem.block('another') {
+                                @include bem.composed-of('something');
 
-                font-size: 2em;
-            }
-        }
+                                font-size: 2em;
+                        }
+                }
 
-        @include expect(false) {
-            .something {
-                font-size: 1em;
-            }
+                @include expect(false) {
+                        .something {
+                                font-size: 1em;
+                        }
 
-            .another {
-                font-size: 2em;
-            }
-        }
-    }
+                        .another {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @each $ns in map-keys(bem.$namespaces) {
-        @include assert('with namespace "#{$ns}", single') { /// 2 ///
-            @include output(false) {
-                @include bem.block('something', $ns) {
-                    font-size: 1em;
-                }
+        @each $ns in map.keys(bem.$namespaces) {
+                @include assert('with namespace "#{$ns}", single') { /// 2 ///
+                        @include output(false) {
+                                @include bem.block('something', $ns) {
+                                        font-size: 1em;
+                                }
 
-                @include bem.block('another') {
-                    @include bem.composed-of('something' $ns);
+                                @include bem.block('another') {
+                                        @include bem.composed-of('something' $ns);
 
-                    font-size: 2em;
-                }
-            }
+                                        font-size: 2em;
+                                }
+                        }
 
-            @include expect(false) {
-                @if $ns != 'theme' {
-                    .#{map-get(bem.$namespaces, $ns)}-something {
-                        font-size: 1em;
-                    }
-                } @else {
-                    .t-something,
-                    [class*=' t-'] .t-something,
-                    [class^='t-'] .t-something {
-                        font-size: 1em;
-                    }
-                }
+                        @include expect(false) {
+                                @layer #{$ns} {
+                                        @if $ns != 'theme' {
+                                                .#{map.get(bem.$namespaces, $ns)}-something {
+                                                        font-size: 1em;
+                                                }
+                                        } @else {
+                                                .t-something,
+                                                [class*=' t-'] .t-something,
+                                                [class^='t-'] .t-something {
+                                                        font-size: 1em;
+                                                }
+                                        }
+                                }
 
-                .another {
-                    font-size: 2em;
-                }
-            }
-        }
-    }
+                                .another {
+                                        font-size: 2em;
+                                }
+                        }
+                }
+        }
 
-    @include assert('without namespace, multiple') { /// 3 ///
-        @include output(false) {
-            @include bem.block('something') {
-                font-size: 1em;
-            }
+        @include assert('without namespace, multiple') { /// 3 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                font-size: 1em;
+                        }
 
-            @include bem.block('somethingElse') {
-                font-size: 1em;
-            }
+                        @include bem.block('somethingElse') {
+                                font-size: 1em;
+                        }
 
-            @include bem.block('another') {
-                @include bem.composed-of('something', 'somethingElse');
+                        @include bem.block('another') {
+                                @include bem.composed-of('something', 'somethingElse');
 
-                font-size: 2em;
-            }
-        }
+                                font-size: 2em;
+                        }
+                }
 
-        @include expect(false) {
-            .something {
-                font-size: 1em;
-            }
+                @include expect(false) {
+                        .something {
+                                font-size: 1em;
+                        }
 
-            .somethingElse {
-                font-size: 1em;
-            }
+                        .somethingElse {
+                                font-size: 1em;
+                        }
 
-            .another {
-                font-size: 2em;
-            }
-        }
-    }
+                        .another {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @each $ns in map-keys(bem.$namespaces) {
-        @include assert('with namespace "#{$ns}", multiple') { /// 4 ///
-            @include output(false) {
-                @include bem.block('something', $ns) {
-                    font-size: 1em;
-                }
+        @each $ns in map.keys(bem.$namespaces) {
+                @include assert('with namespace "#{$ns}", multiple') { /// 4 ///
+                        @include output(false) {
+                                @include bem.block('something', $ns) {
+                                        font-size: 1em;
+                                }
 
-                @include bem.block('somethingElse', $ns) {
-                    font-size: 1em;
-                }
+                                @include bem.block('somethingElse', $ns) {
+                                        font-size: 1em;
+                                }
 
-                @include bem.block('another') {
-                    @include bem.composed-of('something' $ns, 'somethingElse' $ns);
+                                @include bem.block('another') {
+                                        @include bem.composed-of('something' $ns, 'somethingElse' $ns);
 
-                    font-size: 2em;
-                }
-            }
+                                        font-size: 2em;
+                                }
+                        }
 
-            @include expect(false) {
-                @if $ns != 'theme' {
-                    .#{map-get(bem.$namespaces, $ns)}-something {
-                        font-size: 1em;
-                    }
+                        @include expect(false) {
+                                @if $ns != 'theme' {
+                                        @layer #{$ns} {
+                                                .#{map.get(bem.$namespaces, $ns)}-something {
+                                                        font-size: 1em;
+                                                }
+                                        }
 
-                    .#{map-get(bem.$namespaces, $ns)}-somethingElse {
-                        font-size: 1em;
-                    }
-                } @else {
-                    .t-something,
-                    [class*=' t-'] .t-something,
-                    [class^='t-'] .t-something {
-                        font-size: 1em;
-                    }
+                                        @layer #{$ns} {
+                                                .#{map.get(bem.$namespaces, $ns)}-somethingElse {
+                                                        font-size: 1em;
+                                                }
+                                        }
+                                } @else {
+                                        @layer #{$ns} {
+                                                .t-something,
+                                                [class*=' t-'] .t-something,
+                                                [class^='t-'] .t-something {
+                                                        font-size: 1em;
+                                                }
+                                        }
 
-                    .t-somethingElse,
-                    [class*=' t-'] .t-somethingElse,
-                    [class^='t-'] .t-somethingElse {
-                        font-size: 1em;
-                    }
-                }
+                                        @layer #{$ns} {
+                                                .t-somethingElse,
+                                                [class*=' t-'] .t-somethingElse,
+                                                [class^='t-'] .t-somethingElse {
+                                                        font-size: 1em;
+                                                }
+                                        }
+                                }
 
-                .another {
-                    font-size: 2em;
-                }
-            }
-        }
-    }
+                                .another {
+                                        font-size: 2em;
+                                }
+                        }
+                }
+        }
 }
diff --git a/test/bem/_element.scss b/test/bem/_element.scss
index c8839de..dd4efd4 100644
--- a/test/bem/_element.scss
+++ b/test/bem/_element.scss
@@ -22,473 +22,473 @@
 //
 
 @include it('element') {
-    @include assert('single element') { /// 1 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    font-size: 2em;
-                }
-            }
-        }
+        @include assert('single element') { /// 1 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        font-size: 2em;
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, manual selector in-between') { /// 2 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1') {
-                        font-size: 2em;
-                    }
-                }
+        @include assert('single element, manual selector in-between') { /// 2 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1') {
+                                                font-size: 2em;
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child2') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+                                .test & {
+                                        @include bem.elem('child2') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, modifier in-between') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod') {
-                    @include bem.elem('child') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('single element, modifier in-between') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod') {
+                                        @include bem.elem('child') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod .something__child {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect {
+                        .something--mod .something__child {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, nested') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    font-size: 2em;
+        @include assert('single element, nested') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        font-size: 2em;
 
-                    @include bem.elem('subchild') {
-                        font-size: 3em;
-                    }
-                }
-            }
-        }
+                                        @include bem.elem('subchild') {
+                                                font-size: 3em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child {
+                                font-size: 2em;
+                        }
 
-            .something__child .something__subchild {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child .something__subchild {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('single element, nested, manual selector in-between') { /// 5 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1') {
-                        font-size: 2em;
+        @include assert('single element, nested, manual selector in-between') { /// 5 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1') {
+                                                font-size: 2em;
 
-                        @include bem.elem('subchild1') {
-                            font-size: 3em;
-                        }
-                    }
-                }
+                                                @include bem.elem('subchild1') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child2') {
-                        font-size: 2em;
+                                .test & {
+                                        @include bem.elem('child2') {
+                                                font-size: 2em;
 
-                        @include bem.elem('subchild2') {
-                            font-size: 3em;
-                        }
-                    }
-                }
+                                                @include bem.elem('subchild2') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('child3') {
-                    font-size: 2em;
+                                @include bem.elem('child3') {
+                                        font-size: 2em;
 
-                    &:hover {
-                        @include bem.elem('subchild3') {
-                            font-size: 3em;
-                        }
-                    }
+                                        &:hover {
+                                                @include bem.elem('subchild3') {
+                                                        font-size: 3em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.elem('subchild4') {
-                            font-size: 3em;
-                        }
-                    }
-                }
-            }
-        }
+                                        .test & {
+                                                @include bem.elem('subchild4') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1 {
+                                font-size: 2em;
+                        }
 
-            .something:hover .something__child1 .something__subchild1 {
-                font-size: 3em;
-            }
+                        .something:hover .something__child1 .something__subchild1 {
+                                font-size: 3em;
+                        }
 
-            .test .something__child2 {
-                font-size: 2em;
-            }
+                        .test .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child2 .something__subchild2 {
-                font-size: 3em;
-            }
+                        .test .something__child2 .something__subchild2 {
+                                font-size: 3em;
+                        }
 
-            .something__child3 {
-                font-size: 2em;
-            }
+                        .something__child3 {
+                                font-size: 2em;
+                        }
 
-            .something__child3:hover .something__subchild3 {
-                font-size: 3em;
-            }
+                        .something__child3:hover .something__subchild3 {
+                                font-size: 3em;
+                        }
 
-            .test .something__child3 .something__subchild4 {
-                font-size: 3em;
-            }
-        }
-    }
+                        .test .something__child3 .something__subchild4 {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('single element, nested, modifier in-between') { /// 6 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod') {
-                    @include bem.elem('child') {
-                        font-size: 2em;
+        @include assert('single element, nested, modifier in-between') { /// 6 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod') {
+                                        @include bem.elem('child') {
+                                                font-size: 2em;
 
-                        @include bem.elem('subchild') {
-                            font-size: 3em;
-                        }
-                    }
-                }
+                                                @include bem.elem('subchild') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('child') {
-                    font-size: 2em;
+                                @include bem.elem('child') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod') {
-                        @include bem.elem('subchild') {
-                            font-size: 3em;
-                        }
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('mod') {
+                                                @include bem.elem('subchild') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod .something__child {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something--mod .something__child {
+                                font-size: 2em;
+                        }
 
-            .something--mod .something__child .something__subchild {
-                font-size: 3em;
-            }
+                        .something--mod .something__child .something__subchild {
+                                font-size: 3em;
+                        }
 
-            .something__child {
-                font-size: 2em;
-            }
+                        .something__child {
+                                font-size: 2em;
+                        }
 
-            .something__child--mod .something__subchild {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child--mod .something__subchild {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('single element, in at-theme') { /// 7 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.at-theme('dark') {
-                    @include bem.elem('child') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('single element, in at-theme') { /// 7 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.at-theme('dark') {
+                                        @include bem.elem('child') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .t-dark .something__child,
-            [class*=' t-'] .t-dark .something__child,
-            [class^='t-'] .t-dark .something__child {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect(false) {
+                        .t-dark .something__child,
+                        [class*=' t-'] .t-dark .something__child,
+                        [class^='t-'] .t-dark .something__child {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements') { /// 8 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    font-size: 2em;
-                }
-            }
-        }
+        @include assert('multiple elements') { /// 8 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        font-size: 2em;
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1,
-            .something__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child1,
+                        .something__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, manual selector in-between') { /// 9 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1', 'child2') {
-                        font-size: 2em;
-                    }
-                }
+        @include assert('multiple elements, manual selector in-between') { /// 9 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1', 'child2') {
+                                                font-size: 2em;
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child3', 'child4') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+                                .test & {
+                                        @include bem.elem('child3', 'child4') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1,
-            .something:hover .something__child2 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1,
+                        .something:hover .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child3,
-            .test .something__child4 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child3,
+                        .test .something__child4 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, modifier in-between') { /// 10 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod') {
-                    @include bem.elem('child1', 'child2') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('multiple elements, modifier in-between') { /// 10 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod') {
+                                        @include bem.elem('child1', 'child2') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod .something__child1,
-            .something--mod .something__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect {
+                        .something--mod .something__child1,
+                        .something--mod .something__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, nested') { /// 11 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    font-size: 2em;
+        @include assert('multiple elements, nested') { /// 11 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        font-size: 2em;
 
-                    @include bem.elem('subchild1') {
-                        font-size: 3em;
-                    }
-                }
+                                        @include bem.elem('subchild1') {
+                                                font-size: 3em;
+                                        }
+                                }
 
-                @include bem.elem('child3') {
-                    font-size: 2em;
+                                @include bem.elem('child3') {
+                                        font-size: 2em;
 
-                    @include bem.elem('subchild2', 'subchild3') {
-                        font-size: 3em;
-                    }
-                }
-            }
-        }
+                                        @include bem.elem('subchild2', 'subchild3') {
+                                                font-size: 3em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1,
-            .something__child2 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child1,
+                        .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1 .something__subchild1,
-            .something__child2 .something__subchild1 {
-                font-size: 3em;
-            }
+                        .something__child1 .something__subchild1,
+                        .something__child2 .something__subchild1 {
+                                font-size: 3em;
+                        }
 
-            .something__child3 {
-                font-size: 2em;
-            }
+                        .something__child3 {
+                                font-size: 2em;
+                        }
 
-            .something__child3 .something__subchild2,
-            .something__child3 .something__subchild3 {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child3 .something__subchild2,
+                        .something__child3 .something__subchild3 {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, nested, manual selector in-between') { /// 12 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    font-size: 2em;
+        @include assert('multiple elements, nested, manual selector in-between') { /// 12 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        font-size: 2em;
 
-                    &:hover {
-                        @include bem.elem('subchild1') {
-                            font-size: 3em;
-                        }
-                    }
+                                        &:hover {
+                                                @include bem.elem('subchild1') {
+                                                        font-size: 3em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.elem('subchild2') {
-                            font-size: 3em;
-                        }
-                    }
-                }
+                                        .test & {
+                                                @include bem.elem('subchild2') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('child3') {
-                    font-size: 2em;
+                                @include bem.elem('child3') {
+                                        font-size: 2em;
 
-                    &:hover {
-                        @include bem.elem('subchild3', 'subchild4') {
-                            font-size: 3em;
-                        }
-                    }
+                                        &:hover {
+                                                @include bem.elem('subchild3', 'subchild4') {
+                                                        font-size: 3em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.elem('subchild5', 'subchild6') {
-                            font-size: 3em;
-                        }
-                    }
-                }
-            }
-        }
+                                        .test & {
+                                                @include bem.elem('subchild5', 'subchild6') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child1,
-            .something__child2 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something__child1,
+                        .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1:hover .something__subchild1,
-            .something__child2:hover .something__subchild1 {
-                font-size: 3em;
-            }
+                        .something__child1:hover .something__subchild1,
+                        .something__child2:hover .something__subchild1 {
+                                font-size: 3em;
+                        }
 
-            .test .something__child1 .something__subchild2,
-            .test .something__child2 .something__subchild2 {
-                font-size: 3em;
-            }
+                        .test .something__child1 .something__subchild2,
+                        .test .something__child2 .something__subchild2 {
+                                font-size: 3em;
+                        }
 
-            .something__child3 {
-                font-size: 2em;
-            }
+                        .something__child3 {
+                                font-size: 2em;
+                        }
 
-            .something__child3:hover .something__subchild3,
-            .something__child3:hover .something__subchild4 {
-                font-size: 3em;
-            }
+                        .something__child3:hover .something__subchild3,
+                        .something__child3:hover .something__subchild4 {
+                                font-size: 3em;
+                        }
 
-            .test .something__child3 .something__subchild5,
-            .test .something__child3 .something__subchild6 {
-                font-size: 3em;
-            }
-        }
-    }
+                        .test .something__child3 .something__subchild5,
+                        .test .something__child3 .something__subchild6 {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, nested, modifier in-between') { /// 13 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    font-size: 2em;
+        @include assert('multiple elements, nested, modifier in-between') { /// 13 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod') {
-                        @include bem.elem('subchild1') {
-                            font-size: 3em;
-                        }
-                    }
-                }
+                                        @include bem.modifier('mod') {
+                                                @include bem.elem('subchild1') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('child3') {
-                    font-size: 2em;
+                                @include bem.elem('child3') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod') {
-                        @include bem.elem('subchild2', 'subchild3') {
-                            font-size: 3em;
-                        }
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('mod') {
+                                                @include bem.elem('subchild2', 'subchild3') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1,
-            .something__child2 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child1,
+                        .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1--mod .something__subchild1,
-            .something__child2--mod .something__subchild1 {
-                font-size: 3em;
-            }
+                        .something__child1--mod .something__subchild1,
+                        .something__child2--mod .something__subchild1 {
+                                font-size: 3em;
+                        }
 
-            .something__child3 {
-                font-size: 2em;
-            }
+                        .something__child3 {
+                                font-size: 2em;
+                        }
 
-            .something__child3--mod .something__subchild2,
-            .something__child3--mod .something__subchild3 {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child3--mod .something__subchild2,
+                        .something__child3--mod .something__subchild3 {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, in at-theme') { /// 14 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.at-theme('dark') {
-                    @include bem.elem('child1', 'child2') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('multiple elements, in at-theme') { /// 14 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.at-theme('dark') {
+                                        @include bem.elem('child1', 'child2') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .t-dark .something__child1,
-            [class*=' t-'] .t-dark .something__child1,
-            [class^='t-'] .t-dark .something__child1,
-            .t-dark .something__child2,
-            [class*=' t-'] .t-dark .something__child2,
-            [class^='t-'] .t-dark .something__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect(false) {
+                        .t-dark .something__child1,
+                        [class*=' t-'] .t-dark .something__child1,
+                        [class^='t-'] .t-dark .something__child1,
+                        .t-dark .something__child2,
+                        [class*=' t-'] .t-dark .something__child2,
+                        [class^='t-'] .t-dark .something__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_examples.scss b/test/bem/_examples.scss
index 33deca0..9679566 100644
--- a/test/bem/_examples.scss
+++ b/test/bem/_examples.scss
@@ -11,217 +11,223 @@
 //
 
 @include it('Examples') {
-    @include assert('Media object') { /// 1 ///
-        @include output {
-            @include bem.object('media') {
-                display:         flex;
-                align-items:     flex-start;
-                justify-content: flex-start;
+        @include assert('Media object') { /// 1 ///
+                @include output {
+                        @include bem.object('media') {
+                                display:         flex;
+                                align-items:     flex-start;
+                                justify-content: flex-start;
 
-                @include bem.elem('image') {
-                    display:  block;
-                    flex:     0 0 auto;
-                    order:    1;
-                    overflow: hidden;
-                }
+                                @include bem.elem('image') {
+                                        display:  block;
+                                        flex:     0 0 auto;
+                                        order:    1;
+                                        overflow: hidden;
+                                }
 
-                @include bem.elem('body') {
-                    order: 2;
-                }
+                                @include bem.elem('body') {
+                                        order: 2;
+                                }
 
-                @include bem.modifier('rtl') {
-                    justify-content: flex-end;
+                                @include bem.modifier('rtl') {
+                                        justify-content: flex-end;
 
-                    @include bem.elem('image') {
-                        order: 2;
-                    }
+                                        @include bem.elem('image') {
+                                                order: 2;
+                                        }
 
-                    @include bem.elem('body') {
-                        order: 1;
-                    }
-                }
-            }
-        }
+                                        @include bem.elem('body') {
+                                                order: 1;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .o-media {
-                display:         flex;
-                align-items:     flex-start;
-                justify-content: flex-start;
-            }
+                @include expect {
+                        @layer object {
+                                .o-media {
+                                        display:         flex;
+                                        align-items:     flex-start;
+                                        justify-content: flex-start;
+                                }
 
-            .o-media__image {
-                display:  block;
-                flex:     0 0 auto;
-                order:    1;
-                overflow: hidden;
-            }
+                                .o-media__image {
+                                        display:  block;
+                                        flex:     0 0 auto;
+                                        order:    1;
+                                        overflow: hidden;
+                                }
 
-            .o-media__body {
-                order: 2;
-            }
+                                .o-media__body {
+                                        order: 2;
+                                }
 
-            .o-media--rtl {
-                justify-content: flex-end;
+                                .o-media--rtl {
+                                        justify-content: flex-end;
 
-                .o-media__image {
-                    order: 2;
-                }
+                                        .o-media__image {
+                                                order: 2;
+                                        }
 
-                .o-media__body {
-                    order: 1;
-                }
-            }
-        }
-    }
+                                        .o-media__body {
+                                                order: 1;
+                                        }
+                                }
+                        }
+                }
+        }
 
-    @include assert('Tabs') { /// 2 ///
-        @include output {
-            @include bem.component('tabs') {
-                position: relative;
+        @include assert('Tabs') { /// 2 ///
+                @include output {
+                        @include bem.component('tabs') {
+                                position: relative;
 
-                @include bem.elem('tab') {
-                    float: left;
-                }
+                                @include bem.elem('tab') {
+                                        float: left;
+                                }
 
-                @include bem.elem('tabRadio') {
-                    position: absolute;
-                    top:      -9999px;
-                    left:     -9999px;
+                                @include bem.elem('tabRadio') {
+                                        position: absolute;
+                                        top:      -9999px;
+                                        left:     -9999px;
 
-                    &:checked {
-                        @include bem.sibling-elem('tabLabel') {
-                            font-weight: bold;
-                        }
+                                        &:checked {
+                                                @include bem.sibling-elem('tabLabel') {
+                                                        font-weight: bold;
+                                                }
 
-                        @include bem.sibling-elem('tabContent') {
-                            display: block;
-                        }
-                    }
-                }
+                                                @include bem.sibling-elem('tabContent') {
+                                                        display: block;
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('tabLabel') {
-                    cursor: pointer;
+                                @include bem.elem('tabLabel') {
+                                        cursor: pointer;
 
-                    &:hover,
-                    &:active {
-                        text-decoration: underline;
-                    }
-                }
+                                        &:hover,
+                                        &:active {
+                                                text-decoration: underline;
+                                        }
+                                }
 
-                @include bem.elem('tabContent') {
-                    position: absolute;
-                    left:     0;
-                    display:  none;
-                }
-            }
-        }
+                                @include bem.elem('tabContent') {
+                                        position: absolute;
+                                        left:     0;
+                                        display:  none;
+                                }
+                        }
+                }
 
-        @include expect {
-            .c-tabs {
-                position: relative;
-            }
+                @include expect {
+                        @layer component {
+                                .c-tabs {
+                                        position: relative;
+                                }
 
-            .c-tabs__tab {
-                float: left;
-            }
+                                .c-tabs__tab {
+                                        float: left;
+                                }
 
-            .c-tabs__tabRadio {
-                position: absolute;
-                top:      -9999px;
-                left:     -9999px;
-            }
+                                .c-tabs__tabRadio {
+                                        position: absolute;
+                                        top:      -9999px;
+                                        left:     -9999px;
+                                }
 
-            .c-tabs__tabRadio:checked ~ .c-tabs__tabLabel {
-                font-weight: bold;
-            }
+                                .c-tabs__tabRadio:checked ~ .c-tabs__tabLabel {
+                                        font-weight: bold;
+                                }
 
-            .c-tabs__tabRadio:checked ~ .c-tabs__tabContent {
-                display: block;
-            }
+                                .c-tabs__tabRadio:checked ~ .c-tabs__tabContent {
+                                        display: block;
+                                }
 
-            .c-tabs__tabLabel {
-                cursor: pointer;
-            }
+                                .c-tabs__tabLabel {
+                                        cursor: pointer;
+                                }
 
-            .c-tabs__tabLabel:hover,
-            .c-tabs__tabLabel:active {
-                text-decoration: underline;
-            }
+                                .c-tabs__tabLabel:hover,
+                                .c-tabs__tabLabel:active {
+                                        text-decoration: underline;
+                                }
 
-            .c-tabs__tabContent {
-                position: absolute;
-                left:     0;
-                display:  none;
-            }
-        }
-    }
+                                .c-tabs__tabContent {
+                                        position: absolute;
+                                        left:     0;
+                                        display:  none;
+                                }
+                        }
+                }
+        }
 
-    @include assert('Accordion') { /// 3 ///
-        @include output {
-            @include bem.component('accordion') {
-                @include bem.elem('section') {
-                    // nothing to do
-                }
+        @include assert('Accordion') { /// 3 ///
+                @include output {
+                        @include bem.component('accordion') {
+                                @include bem.elem('section') {
+                                        // nothing to do
+                                }
 
-                @include bem.elem('sectionCheckbox') {
-                    position: absolute;
-                    top:      -9999px;
-                    left:     -9999px;
+                                @include bem.elem('sectionCheckbox') {
+                                        position: absolute;
+                                        top:      -9999px;
+                                        left:     -9999px;
 
-                    &:checked {
-                        @include bem.sibling-elem('sectionLabel') {
-                            font-weight: bold;
-                        }
+                                        &:checked {
+                                                @include bem.sibling-elem('sectionLabel') {
+                                                        font-weight: bold;
+                                                }
 
-                        @include bem.sibling-elem('sectionContent') {
-                            display: block;
-                        }
-                    }
-                }
+                                                @include bem.sibling-elem('sectionContent') {
+                                                        display: block;
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('sectionLabel') {
-                    cursor: pointer;
+                                @include bem.elem('sectionLabel') {
+                                        cursor: pointer;
 
-                    &:hover,
-                    &:active {
-                        text-decoration: underline;
-                    }
-                }
+                                        &:hover,
+                                        &:active {
+                                                text-decoration: underline;
+                                        }
+                                }
 
-                @include bem.elem('sectionContent') {
-                    display: none;
-                }
-            }
-        }
+                                @include bem.elem('sectionContent') {
+                                        display: none;
+                                }
+                        }
+                }
 
-        @include expect {
-            .c-accordion__sectionCheckbox {
-                position: absolute;
-                top:      -9999px;
-                left:     -9999px;
-            }
+                @include expect {
+                        @layer component {
+                                .c-accordion__sectionCheckbox {
+                                        position: absolute;
+                                        top:      -9999px;
+                                        left:     -9999px;
+                                }
 
-            .c-accordion__sectionCheckbox:checked ~ .c-accordion__sectionLabel {
-                font-weight: bold;
-            }
+                                .c-accordion__sectionCheckbox:checked ~ .c-accordion__sectionLabel {
+                                        font-weight: bold;
+                                }
 
-            .c-accordion__sectionCheckbox:checked ~ .c-accordion__sectionContent {
-                display: block;
-            }
+                                .c-accordion__sectionCheckbox:checked ~ .c-accordion__sectionContent {
+                                        display: block;
+                                }
 
-            .c-accordion__sectionLabel {
-                cursor: pointer;
-            }
+                                .c-accordion__sectionLabel {
+                                        cursor: pointer;
+                                }
 
-            .c-accordion__sectionLabel:hover,
-            .c-accordion__sectionLabel:active {
-                text-decoration: underline;
-            }
+                                .c-accordion__sectionLabel:hover,
+                                .c-accordion__sectionLabel:active {
+                                        text-decoration: underline;
+                                }
 
-            .c-accordion__sectionContent {
-                display:  none;
-            }
-        }
-    }
+                                .c-accordion__sectionContent {
+                                        display:  none;
+                                }
+                        }
+                }
+        }
 }
diff --git a/test/bem/_modifier.scss b/test/bem/_modifier.scss
index 934efa3..419aa91 100644
--- a/test/bem/_modifier.scss
+++ b/test/bem/_modifier.scss
@@ -23,633 +23,633 @@
 //
 
 @include it('modifier') {
-    @include assert('block modifier') { /// 1 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod') {
-                    font-size: 1.5em;
+        @include assert('block modifier') { /// 1 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod') {
+                                        font-size: 1.5em;
 
-                    @include bem.modifier('submod') {
-                        font-size: 1.75em;
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('submod') {
+                                                font-size: 1.75em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod {
-                font-size: 1.5em;
-            }
+                @include expect {
+                        .something--mod {
+                                font-size: 1.5em;
+                        }
 
-            .something--mod.something--submod {
-                font-size: 1.75em;
-            }
-        }
-    }
+                        .something--mod.something--submod {
+                                font-size: 1.75em;
+                        }
+                }
+        }
 
-    @include assert('block modifier, in at-theme') { /// 2 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.at-theme('dark') {
-                    @include bem.modifier('mod') {
-                        font-size: 1.5em;
+        @include assert('block modifier, in at-theme') { /// 2 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.at-theme('dark') {
+                                        @include bem.modifier('mod') {
+                                                font-size: 1.5em;
 
-                        @include bem.modifier('submod') {
-                            font-size: 1.75em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('submod') {
+                                                        font-size: 1.75em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .t-dark .something--mod,
-            [class*=' t-'] .t-dark .something--mod,
-            [class^='t-'] .t-dark .something--mod {
-                font-size: 1.5em;
-            }
+                @include expect(false) {
+                        .t-dark .something--mod,
+                        [class*=' t-'] .t-dark .something--mod,
+                        [class^='t-'] .t-dark .something--mod {
+                                font-size: 1.5em;
+                        }
 
-            .t-dark .something--mod.something--submod,
-            [class*=' t-'] .t-dark .something--mod.something--submod,
-            [class^='t-'] .t-dark .something--mod.something--submod {
-                font-size: 1.75em;
-            }
-        }
-    }
+                        .t-dark .something--mod.something--submod,
+                        [class*=' t-'] .t-dark .something--mod.something--submod,
+                        [class^='t-'] .t-dark .something--mod.something--submod {
+                                font-size: 1.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, single element') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.modifier('mod') {
-                        font-size: 2.5em;
+        @include assert('element modifier, single element') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.modifier('mod') {
+                                                font-size: 2.5em;
 
-                        @include bem.modifier('submod') {
-                            font-size: 2.75em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('submod') {
+                                                        font-size: 2.75em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child--mod {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something__child--mod.something__child--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child--mod.something__child--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, multiple elements') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.modifier('mod') {
-                        font-size: 2.5em;
+        @include assert('element modifier, multiple elements') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.modifier('mod') {
+                                                font-size: 2.5em;
 
-                        @include bem.modifier('submod') {
-                            font-size: 2.75em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('submod') {
+                                                        font-size: 2.75em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1--mod,
-            .something__child2--mod {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child1--mod,
+                        .something__child2--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something__child1--mod.something__child1--submod,
-            .something__child2--mod.something__child2--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child1--mod.something__child1--submod,
+                        .something__child2--mod.something__child2--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, single related element') { /// 5 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1') {
-                    @include bem.next-elem('child2') {
-                        @include bem.modifier('mod') {
-                            font-size: 2.5em;
+        @include assert('element modifier, single related element') { /// 5 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1') {
+                                        @include bem.next-elem('child2') {
+                                                @include bem.modifier('mod') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('submod') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child2--mod {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child1 + .something__child2--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something__child1 + .something__child2--mod.something__child2--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child1 + .something__child2--mod.something__child2--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, multiple related elements') { /// 6 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1') {
-                    @include bem.next-elem('child2', 'child3') {
-                        @include bem.modifier('mod') {
-                            font-size: 2.5em;
+        @include assert('element modifier, multiple related elements') { /// 6 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1') {
+                                        @include bem.next-elem('child2', 'child3') {
+                                                @include bem.modifier('mod') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('submod') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child2--mod,
-            .something__child1 + .something__child3--mod {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child1 + .something__child2--mod,
+                        .something__child1 + .something__child3--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something__child1 + .something__child2--mod.something__child2--submod,
-            .something__child1 + .something__child3--mod.something__child3--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child1 + .something__child2--mod.something__child2--submod,
+                        .something__child1 + .something__child3--mod.something__child3--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, single element, manual selector before') { /// 7 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1') {
-                        @include bem.modifier('mod') {
-                            font-size: 2.5em;
+        @include assert('element modifier, single element, manual selector before') { /// 7 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1') {
+                                                @include bem.modifier('mod') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
+                                                        @include bem.modifier('submod') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child2') {
-                        @include bem.modifier('mod') {
-                            font-size: 2.5em;
+                                .test & {
+                                        @include bem.elem('child2') {
+                                                @include bem.modifier('mod') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('submod') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1--mod {
-                font-size: 2.5em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something:hover .something__child1--mod.something__child1--submod {
-                font-size: 2.75em;
-            }
+                        .something:hover .something__child1--mod.something__child1--submod {
+                                font-size: 2.75em;
+                        }
 
-            .test .something__child2--mod {
-                font-size: 2.5em;
-            }
+                        .test .something__child2--mod {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child2--mod.something__child2--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .test .something__child2--mod.something__child2--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, multiple elements, manual selector before') { /// 8 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1', 'child2') {
-                        @include bem.modifier('mod') {
-                            font-size: 2.5em;
+        @include assert('element modifier, multiple elements, manual selector before') { /// 8 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1', 'child2') {
+                                                @include bem.modifier('mod') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
+                                                        @include bem.modifier('submod') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child3', 'child4') {
-                        @include bem.modifier('mod') {
-                            font-size: 2.5em;
+                                .test & {
+                                        @include bem.elem('child3', 'child4') {
+                                                @include bem.modifier('mod') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('submod') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1--mod,
-            .something:hover .something__child2--mod {
-                font-size: 2.5em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1--mod,
+                        .something:hover .something__child2--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something:hover .something__child1--mod.something__child1--submod,
-            .something:hover .something__child2--mod.something__child2--submod {
-                font-size: 2.75em;
-            }
+                        .something:hover .something__child1--mod.something__child1--submod,
+                        .something:hover .something__child2--mod.something__child2--submod {
+                                font-size: 2.75em;
+                        }
 
-            .test .something__child3--mod,
-            .test .something__child4--mod {
-                font-size: 2.5em;
-            }
+                        .test .something__child3--mod,
+                        .test .something__child4--mod {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child3--mod.something__child3--submod,
-            .test .something__child4--mod.something__child4--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .test .something__child3--mod.something__child3--submod,
+                        .test .something__child4--mod.something__child4--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, single related element, manual selector before') { /// 9 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1') {
-                        @include bem.next-elem('child2') {
-                            @include bem.modifier('mod1') {
-                                font-size: 2.5em;
+        @include assert('element modifier, single related element, manual selector before') { /// 9 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1') {
+                                                @include bem.next-elem('child2') {
+                                                        @include bem.modifier('mod1') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod1') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
-                }
+                                                                @include bem.modifier('submod1') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child3') {
-                        @include bem.next-elem('child4') {
-                            @include bem.modifier('mod1') {
-                                font-size: 2.5em;
+                                .test & {
+                                        @include bem.elem('child3') {
+                                                @include bem.next-elem('child4') {
+                                                        @include bem.modifier('mod1') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod1') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
-                }
+                                                                @include bem.modifier('submod1') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('child5') {
-                    &:hover {
-                        @include bem.next-elem('child6') {
-                            @include bem.modifier('mod2') {
-                                font-size: 2.5em;
+                                @include bem.elem('child5') {
+                                        &:hover {
+                                                @include bem.next-elem('child6') {
+                                                        @include bem.modifier('mod2') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod2') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
+                                                                @include bem.modifier('submod2') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.next-elem('child7') {
-                            @include bem.modifier('mod2') {
-                                font-size: 2.5em;
+                                        .test & {
+                                                @include bem.next-elem('child7') {
+                                                        @include bem.modifier('mod2') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod2') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                                @include bem.modifier('submod2') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1 + .something__child2--mod1 {
-                font-size: 2.5em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1 + .something__child2--mod1 {
+                                font-size: 2.5em;
+                        }
 
-            .something:hover .something__child1 + .something__child2--mod1.something__child2--submod1 {
-                font-size: 2.75em;
-            }
+                        .something:hover .something__child1 + .something__child2--mod1.something__child2--submod1 {
+                                font-size: 2.75em;
+                        }
 
-            .test .something__child3 + .something__child4--mod1 {
-                font-size: 2.5em;
-            }
+                        .test .something__child3 + .something__child4--mod1 {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child3 + .something__child4--mod1.something__child4--submod1 {
-                font-size: 2.75em;
-            }
+                        .test .something__child3 + .something__child4--mod1.something__child4--submod1 {
+                                font-size: 2.75em;
+                        }
 
-            .something__child5:hover + .something__child6--mod2 {
-                font-size: 2.5em;
-            }
+                        .something__child5:hover + .something__child6--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child5:hover + .something__child6--mod2.something__child6--submod2 {
-                font-size: 2.75em;
-            }
+                        .something__child5:hover + .something__child6--mod2.something__child6--submod2 {
+                                font-size: 2.75em;
+                        }
 
-            .test .something__child5 + .something__child7--mod2 {
-                font-size: 2.5em;
-            }
+                        .test .something__child5 + .something__child7--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child5 + .something__child7--mod2.something__child7--submod2 {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .test .something__child5 + .something__child7--mod2.something__child7--submod2 {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('element modifier, multiple related elements, manual selector before') { /// 10 ///
-        @include output(false) {
-            @include bem.block('something') {
-                &:hover {
-                    @include bem.elem('child1') {
-                        @include bem.next-elem('child2', 'child3') {
-                            @include bem.modifier('mod1') {
-                                font-size: 2.5em;
+        @include assert('element modifier, multiple related elements, manual selector before') { /// 10 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                &:hover {
+                                        @include bem.elem('child1') {
+                                                @include bem.next-elem('child2', 'child3') {
+                                                        @include bem.modifier('mod1') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod1') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
-                }
+                                                                @include bem.modifier('submod1') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
+                                }
 
-                .test & {
-                    @include bem.elem('child4') {
-                        @include bem.next-elem('child5', 'child6') {
-                            @include bem.modifier('mod1') {
-                                font-size: 2.5em;
+                                .test & {
+                                        @include bem.elem('child4') {
+                                                @include bem.next-elem('child5', 'child6') {
+                                                        @include bem.modifier('mod1') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod1') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
-                }
+                                                                @include bem.modifier('submod1') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
+                                }
 
-                @include bem.elem('child7') {
-                    &:hover {
-                        @include bem.next-elem('child8', 'child9') {
-                            @include bem.modifier('mod2') {
-                                font-size: 2.5em;
+                                @include bem.elem('child7') {
+                                        &:hover {
+                                                @include bem.next-elem('child8', 'child9') {
+                                                        @include bem.modifier('mod2') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod2') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
+                                                                @include bem.modifier('submod2') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.next-elem('child10', 'child11') {
-                            @include bem.modifier('mod2') {
-                                font-size: 2.5em;
+                                        .test & {
+                                                @include bem.next-elem('child10', 'child11') {
+                                                        @include bem.modifier('mod2') {
+                                                                font-size: 2.5em;
 
-                                @include bem.modifier('submod2') {
-                                    font-size: 2.75em;
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                                @include bem.modifier('submod2') {
+                                                                        font-size: 2.75em;
+                                                                }
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something:hover .something__child1 + .something__child2--mod1,
-            .something:hover .something__child1 + .something__child3--mod1 {
-                font-size: 2.5em;
-            }
+                @include expect(false) {
+                        .something:hover .something__child1 + .something__child2--mod1,
+                        .something:hover .something__child1 + .something__child3--mod1 {
+                                font-size: 2.5em;
+                        }
 
-            .something:hover .something__child1 + .something__child2--mod1.something__child2--submod1,
-            .something:hover .something__child1 + .something__child3--mod1.something__child3--submod1 {
-                font-size: 2.75em;
-            }
+                        .something:hover .something__child1 + .something__child2--mod1.something__child2--submod1,
+                        .something:hover .something__child1 + .something__child3--mod1.something__child3--submod1 {
+                                font-size: 2.75em;
+                        }
 
-            .test .something__child4 + .something__child5--mod1,
-            .test .something__child4 + .something__child6--mod1 {
-                font-size: 2.5em;
-            }
+                        .test .something__child4 + .something__child5--mod1,
+                        .test .something__child4 + .something__child6--mod1 {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child4 + .something__child5--mod1.something__child5--submod1,
-            .test .something__child4 + .something__child6--mod1.something__child6--submod1 {
-                font-size: 2.75em;
-            }
+                        .test .something__child4 + .something__child5--mod1.something__child5--submod1,
+                        .test .something__child4 + .something__child6--mod1.something__child6--submod1 {
+                                font-size: 2.75em;
+                        }
 
-            .something__child7:hover + .something__child8--mod2,
-            .something__child7:hover + .something__child9--mod2 {
-                font-size: 2.5em;
-            }
+                        .something__child7:hover + .something__child8--mod2,
+                        .something__child7:hover + .something__child9--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child7:hover + .something__child8--mod2.something__child8--submod2,
-            .something__child7:hover + .something__child9--mod2.something__child9--submod2 {
-                font-size: 2.75em;
-            }
+                        .something__child7:hover + .something__child8--mod2.something__child8--submod2,
+                        .something__child7:hover + .something__child9--mod2.something__child9--submod2 {
+                                font-size: 2.75em;
+                        }
 
-            .test .something__child7 + .something__child10--mod2,
-            .test .something__child7 + .something__child11--mod2 {
-                font-size: 2.5em;
-            }
+                        .test .something__child7 + .something__child10--mod2,
+                        .test .something__child7 + .something__child11--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child7 + .something__child10--mod2.something__child10--submod2,
-            .test .something__child7 + .something__child11--mod2.something__child11--submod2 {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .test .something__child7 + .something__child10--mod2.something__child10--submod2,
+                        .test .something__child7 + .something__child11--mod2.something__child11--submod2 {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    // @include assert('element modifier, in at-theme') { /// 11 ///
-    //     @include output(false) {
-    //         @include bem.block('something') {
-    //             @include bem.at-theme('dark') {
-    //                 @include bem.elem('child') {
-    //                     @include bem.modifier('mod') {
-    //                         font-size: 2.5em;
-    // 
-    //                         @include bem.modifier('submod') {
-    //                             font-size: 2.75em;
-    //                         }
-    //                     }
-    //                 }
-    //             }
-    //         }
-    //     }
-    //     
-    //     @include expect(false) {
-    //         .t-dark .something__child--mod,
-    //         [class*=' t-'] .t-dark .something__child--mod,
-    //         [class^='t-'] .t-dark .something__child--mod {
-    //             font-size: 2.5em;
-    //         }
-    // 
-    //         .t-dark .something__child--mod.something__child--submod,
-    //         [class*=' t-'] .t-dark .something__child--mod.something__child--submod,
-    //         [class^='t-'] .t-dark .something__child--mod.something__child--submod {
-    //             font-size: 2.75em;
-    //         }
-    //     }
-    // }
+        // @include assert('element modifier, in at-theme') { /// 11 ///
+        //     @include output(false) {
+        //         @include bem.block('something') {
+        //             @include bem.at-theme('dark') {
+        //                 @include bem.elem('child') {
+        //                     @include bem.modifier('mod') {
+        //                         font-size: 2.5em;
+        // 
+        //                         @include bem.modifier('submod') {
+        //                             font-size: 2.75em;
+        //                         }
+        //                     }
+        //                 }
+        //             }
+        //         }
+        //     }
+        //     
+        //     @include expect(false) {
+        //         .t-dark .something__child--mod,
+        //         [class*=' t-'] .t-dark .something__child--mod,
+        //         [class^='t-'] .t-dark .something__child--mod {
+        //             font-size: 2.5em;
+        //         }
+        // 
+        //         .t-dark .something__child--mod.something__child--submod,
+        //         [class*=' t-'] .t-dark .something__child--mod.something__child--submod,
+        //         [class^='t-'] .t-dark .something__child--mod.something__child--submod {
+        //             font-size: 2.75em;
+        //         }
+        //     }
+        // }
 
-    @include assert('nested block modifiers, extending') { /// 12 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod') {
-                    font-size: 1.5em;
+        @include assert('nested block modifiers, extending') { /// 12 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod') {
+                                        font-size: 1.5em;
 
-                    @include bem.modifier('submod' true) {
-                        font-size: 1.75em;
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('submod' true) {
+                                                font-size: 1.75em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod {
-                font-size: 1.5em;
-            }
+                @include expect {
+                        .something--mod {
+                                font-size: 1.5em;
+                        }
 
-            .something--mod--submod {
-                font-size: 1.75em;
-            }
-        }
-    }
+                        .something--mod--submod {
+                                font-size: 1.75em;
+                        }
+                }
+        }
 
-    @include assert('nested element modifiers, extending') { /// 13 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.modifier('mod') {
-                        font-size: 2.5em;
+        @include assert('nested element modifiers, extending') { /// 13 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.modifier('mod') {
+                                                font-size: 2.5em;
 
-                        @include bem.modifier('submod' true) {
-                            font-size: 2.75em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('submod' true) {
+                                                        font-size: 2.75em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child--mod {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something__child--mod--submod {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child--mod--submod {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('block and element modifiers, single element') { /// 14 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod1') {
-                    font-size: 1.5em;
+        @include assert('block and element modifiers, single element') { /// 14 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod1') {
+                                        font-size: 1.5em;
 
-                    @include bem.modifier('submod1') {
-                        font-size: 1.75em;
-                    }
+                                        @include bem.modifier('submod1') {
+                                                font-size: 1.75em;
+                                        }
 
-                    @include bem.elem('child') {
-                        @include bem.modifier('mod2') {
-                            font-size: 2.5em;
+                                        @include bem.elem('child') {
+                                                @include bem.modifier('mod2') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod2') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('submod2') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod1 {
-                font-size: 1.5em;
-            }
+                @include expect {
+                        .something--mod1 {
+                                font-size: 1.5em;
+                        }
 
-            .something--mod1.something--submod1 {
-                font-size: 1.75em;
-            }
+                        .something--mod1.something--submod1 {
+                                font-size: 1.75em;
+                        }
 
-            .something--mod1 .something__child--mod2 {
-                font-size: 2.5em;
-            }
+                        .something--mod1 .something__child--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .something--mod1 .something__child--mod2.something__child--submod2 {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something--mod1 .something__child--mod2.something__child--submod2 {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('block and element modifiers, multiple elements') { /// 15 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod1') {
-                    font-size: 1.5em;
+        @include assert('block and element modifiers, multiple elements') { /// 15 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod1') {
+                                        font-size: 1.5em;
 
-                    @include bem.modifier('submod1') {
-                        font-size: 1.75em;
-                    }
+                                        @include bem.modifier('submod1') {
+                                                font-size: 1.75em;
+                                        }
 
-                    @include bem.elem('child1', 'child2') {
-                        @include bem.modifier('mod2') {
-                            font-size: 2.5em;
+                                        @include bem.elem('child1', 'child2') {
+                                                @include bem.modifier('mod2') {
+                                                        font-size: 2.5em;
 
-                            @include bem.modifier('submod2') {
-                                font-size: 2.75em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('submod2') {
+                                                                font-size: 2.75em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod1 {
-                font-size: 1.5em;
-            }
+                @include expect {
+                        .something--mod1 {
+                                font-size: 1.5em;
+                        }
 
-            .something--mod1.something--submod1 {
-                font-size: 1.75em;
-            }
+                        .something--mod1.something--submod1 {
+                                font-size: 1.75em;
+                        }
 
-            .something--mod1 .something__child1--mod2,
-            .something--mod1 .something__child2--mod2 {
-                font-size: 2.5em;
-            }
+                        .something--mod1 .something__child1--mod2,
+                        .something--mod1 .something__child2--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .something--mod1 .something__child1--mod2.something__child1--submod2,
-            .something--mod1 .something__child2--mod2.something__child2--submod2 {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something--mod1 .something__child1--mod2.something__child1--submod2,
+                        .something--mod1 .something__child2--mod2.something__child2--submod2 {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_multi.scss b/test/bem/_multi.scss
index 255fb45..88a4cf4 100644
--- a/test/bem/_multi.scss
+++ b/test/bem/_multi.scss
@@ -26,569 +26,569 @@
 //
 
 @include it('multi') {
-    @include assert('in root, 2 blocks') { /// 1 ///
-        @include output {
-            @include bem.multi('component:' 'block1', 'object:' 'block2') {
-                font-size: 1em;
+        @include assert('in root, 2 blocks') { /// 1 ///
+                @include output {
+                        @include bem.multi('component:' 'block1', 'object:' 'block2') {
+                                font-size: 1em;
 
-                @include bem.elem('child2') {
-                    font-size: 2em;
-                }
-            }
-        }
+                                @include bem.elem('child2') {
+                                        font-size: 2em;
+                                }
+                        }
+                }
 
-        @include expect {
-            .c-block1 {
-                font-size: 1em;
-            }
+                @include expect {
+                        .c-block1 {
+                                font-size: 1em;
+                        }
 
-            .c-block1__child2 {
-                font-size: 2em;
-            }
+                        .c-block1__child2 {
+                                font-size: 2em;
+                        }
 
-            .o-block2 {
-                font-size: 1em;
-            }
+                        .o-block2 {
+                                font-size: 1em;
+                        }
 
-            .o-block2__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .o-block2__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('in root, 1 block, 1 manual selector') { /// 2 ///
-        @include output {
-            @include bem.multi('component:' 'block1', 'a:hover') {
-                font-size: 1em;
-            }
-        }
+        @include assert('in root, 1 block, 1 manual selector') { /// 2 ///
+                @include output {
+                        @include bem.multi('component:' 'block1', 'a:hover') {
+                                font-size: 1em;
+                        }
+                }
 
-        @include expect {
-            .c-block1 {
-                font-size: 1em;
-            }
+                @include expect {
+                        .c-block1 {
+                                font-size: 1em;
+                        }
 
-            a:hover {
-                font-size: 1em;
-            }
-        }
-    }
+                        a:hover {
+                                font-size: 1em;
+                        }
+                }
+        }
 
-    @include assert('in block, 2 elements') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.multi('elem:' 'child1' 'child2') {
-                    font-size: 2em;
+        @include assert('in block, 2 elements') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.multi('elem:' 'child1' 'child2') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod') {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('mod') {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1,
-            .something__child2 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child1,
+                        .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1--mod,
-            .something__child2--mod {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something__child1--mod,
+                        .something__child2--mod {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('in block, 1 element, 1 modifier') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.multi('elem:' 'child', 'modifier:' 'mod1') {
-                    font-size: 2em;
+        @include assert('in block, 1 element, 1 modifier') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.multi('elem:' 'child', 'modifier:' 'mod1') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod2') {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('mod2') {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child {
+                                font-size: 2em;
+                        }
 
-            .something__child--mod2 {
-                font-size: 2.5em;
-            }
+                        .something__child--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .something--mod1 {
-                font-size: 2em;
-            }
+                        .something--mod1 {
+                                font-size: 2em;
+                        }
 
-            .something--mod1.something--mod2 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something--mod1.something--mod2 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('in block, 1 element, 1 extending modifier') { /// 5 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.multi('elem:' 'child', 'modifier:' 'mod1') {
-                    font-size: 2em;
+        @include assert('in block, 1 element, 1 extending modifier') { /// 5 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.multi('elem:' 'child', 'modifier:' 'mod1') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod2' true) {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('mod2' true) {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child {
+                                font-size: 2em;
+                        }
 
-            .something__child--mod2 {
-                font-size: 2.5em;
-            }
+                        .something__child--mod2 {
+                                font-size: 2.5em;
+                        }
 
-            .something--mod1 {
-                font-size: 2em;
-            }
+                        .something--mod1 {
+                                font-size: 2em;
+                        }
 
-            .something--mod1--mod2 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something--mod1--mod2 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('in block, 1 element, 1 & selector') { /// 6 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.multi('&', 'elem:' 'child') {
-                    font-size: 2em;
+        @include assert('in block, 1 element, 1 & selector') { /// 6 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.multi('&', 'elem:' 'child') {
+                                        font-size: 2em;
 
-                    @include bem.modifier('mod') {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+                                        @include bem.modifier('mod') {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something {
+                                font-size: 2em;
+                        }
 
-            .something--mod {
-                font-size: 2.5em;
-            }
+                        .something--mod {
+                                font-size: 2.5em;
+                        }
 
-            .something__child {
-                font-size: 2em;
-            }
+                        .something__child {
+                                font-size: 2em;
+                        }
 
-            .something__child--mod {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something__child--mod {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('in block, 1 element, 1 manual selector') { /// 7 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.multi('> a:hover', 'elem:' 'child1') {
-                    font-size: 2em;
+        @include assert('in block, 1 element, 1 manual selector') { /// 7 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.multi('> a:hover', 'elem:' 'child1') {
+                                        font-size: 2em;
 
-                    @include bem.elem('child2') {
-                        font-size: 3em;
-                    }
-                }
-            }
-        }
+                                        @include bem.elem('child2') {
+                                                font-size: 3em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something > a:hover {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something > a:hover {
+                                font-size: 2em;
+                        }
 
-            .something > a:hover .something__child2 {
-                font-size: 3em;
-            }
+                        .something > a:hover .something__child2 {
+                                font-size: 3em;
+                        }
 
-            .something__child1 {
-                font-size: 2em;
-            }
+                        .something__child1 {
+                                font-size: 2em;
+                        }
 
-            .something__child1 .something__child2 {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child1 .something__child2 {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('in element, 2 elements, 1 modifier') { /// 8 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.multi('elem:' 'subchild1' 'subchild2', 'modifier:' 'mod1') {
-                        font-size: 3em;
+        @include assert('in element, 2 elements, 1 modifier') { /// 8 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.multi('elem:' 'subchild1' 'subchild2', 'modifier:' 'mod1') {
+                                                font-size: 3em;
 
-                        @include bem.modifier('mod2') {
-                            font-size: 3.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('mod2') {
+                                                        font-size: 3.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child .something__subchild1,
-            .something__child .something__subchild2 {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child .something__subchild1,
+                        .something__child .something__subchild2 {
+                                font-size: 3em;
+                        }
 
-            .something__child .something__subchild1--mod2,
-            .something__child .something__subchild2--mod2 {
-                font-size: 3.5em;
-            }
+                        .something__child .something__subchild1--mod2,
+                        .something__child .something__subchild2--mod2 {
+                                font-size: 3.5em;
+                        }
 
-            .something__child--mod1 {
-                font-size: 3em;
-            }
+                        .something__child--mod1 {
+                                font-size: 3em;
+                        }
 
-            .something__child--mod1.something__child--mod2 {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child--mod1.something__child--mod2 {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 
-    @include assert('in element, 1 element, 1 & selector') { /// 9 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.multi('elem:' 'subchild', '&') {
-                        font-size: 3em;
+        @include assert('in element, 1 element, 1 & selector') { /// 9 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.multi('elem:' 'subchild', '&') {
+                                                font-size: 3em;
 
-                        @include bem.modifier('mod') {
-                            font-size: 3.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('mod') {
+                                                        font-size: 3.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child .something__subchild {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child .something__subchild {
+                                font-size: 3em;
+                        }
 
-            .something__child .something__subchild--mod {
-                font-size: 3.5em;
-            }
+                        .something__child .something__subchild--mod {
+                                font-size: 3.5em;
+                        }
 
-            .something__child {
-                font-size: 3em;
-            }
+                        .something__child {
+                                font-size: 3em;
+                        }
 
-            .something__child--mod {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child--mod {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 
-    @include assert('in element in manual selector, 2 elements') { /// 10 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    &:hover {
-                        @include bem.multi('elem:' 'subchild1' 'subchild2') {
-                            font-size: 3em;
+        @include assert('in element in manual selector, 2 elements') { /// 10 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        &:hover {
+                                                @include bem.multi('elem:' 'subchild1' 'subchild2') {
+                                                        font-size: 3em;
 
-                            @include bem.modifier('mod2') {
-                                font-size: 3.5em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('mod2') {
+                                                                font-size: 3.5em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child:hover .something__subchild1,
-            .something__child:hover .something__subchild2 {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child:hover .something__subchild1,
+                        .something__child:hover .something__subchild2 {
+                                font-size: 3em;
+                        }
 
-            .something__child:hover .something__subchild1--mod2,
-            .something__child:hover .something__subchild2--mod2 {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child:hover .something__subchild1--mod2,
+                        .something__child:hover .something__subchild2--mod2 {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 
-    @include assert('in element in manual selector, 1 element, 1 & selector') { /// 11 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    &:hover {
-                        @include bem.multi('elem:' 'subchild', '&') {
-                            font-size: 3em;
-                        }
-                    }
-                }
-            }
-        }
+        @include assert('in element in manual selector, 1 element, 1 & selector') { /// 11 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        &:hover {
+                                                @include bem.multi('elem:' 'subchild', '&') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child:hover .something__subchild {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child:hover .something__subchild {
+                                font-size: 3em;
+                        }
 
-            .something__child:hover {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child:hover {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('in multiple elements, 2 elements, 1 modifier') { /// 12 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.multi('elem:' 'subchild1' 'subchild2', 'modifier:' 'mod') {
-                        font-size: 3em;
-                    }
-                }
-            }
-        }
+        @include assert('in multiple elements, 2 elements, 1 modifier') { /// 12 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.multi('elem:' 'subchild1' 'subchild2', 'modifier:' 'mod') {
+                                                font-size: 3em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 .something__subchild1,
-            .something__child2 .something__subchild1,
-            .something__child1 .something__subchild2,
-            .something__child2 .something__subchild2  {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child1 .something__subchild1,
+                        .something__child2 .something__subchild1,
+                        .something__child1 .something__subchild2,
+                        .something__child2 .something__subchild2 {
+                                font-size: 3em;
+                        }
 
-            .something__child1--mod,
-            .something__child2--mod {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child1--mod,
+                        .something__child2--mod {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('in multiple elements, 1 element, 1 & selector') { /// 13 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.multi('elem:' 'subchild', '&') {
-                        font-size: 3em;
+        @include assert('in multiple elements, 1 element, 1 & selector') { /// 13 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.multi('elem:' 'subchild', '&') {
+                                                font-size: 3em;
 
-                        @include bem.modifier('mod') {
-                            font-size: 3.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('mod') {
+                                                        font-size: 3.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 .something__subchild,
-            .something__child2 .something__subchild {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child1 .something__subchild,
+                        .something__child2 .something__subchild {
+                                font-size: 3em;
+                        }
 
-            .something__child1 .something__subchild--mod,
-            .something__child2 .something__subchild--mod {
-                font-size: 3.5em;
-            }
+                        .something__child1 .something__subchild--mod,
+                        .something__child2 .something__subchild--mod {
+                                font-size: 3.5em;
+                        }
 
-            .something__child1,
-            .something__child2 {
-                font-size: 3em;
-            }
+                        .something__child1,
+                        .something__child2 {
+                                font-size: 3em;
+                        }
 
-            .something__child1--mod,
-            .something__child2--mod {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child1--mod,
+                        .something__child2--mod {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 
-    @include assert('in related elements, 2 elements, 1 modifier') { /// 14 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1') {
-                    @include bem.next-elem('child2', 'child3') {
-                        @include bem.multi('elem:' 'subchild1' 'subchild2', 'modifier:' 'mod') {
-                            font-size: 3em;
-                        }
-                    }
-                }
-            }
-        }
+        @include assert('in related elements, 2 elements, 1 modifier') { /// 14 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1') {
+                                        @include bem.next-elem('child2', 'child3') {
+                                                @include bem.multi('elem:' 'subchild1' 'subchild2', 'modifier:' 'mod') {
+                                                        font-size: 3em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child2 .something__subchild1,
-            .something__child1 + .something__child3 .something__subchild1,
-            .something__child1 + .something__child2 .something__subchild2,
-            .something__child1 + .something__child3 .something__subchild2 {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child1 + .something__child2 .something__subchild1,
+                        .something__child1 + .something__child3 .something__subchild1,
+                        .something__child1 + .something__child2 .something__subchild2,
+                        .something__child1 + .something__child3 .something__subchild2 {
+                                font-size: 3em;
+                        }
 
-            .something__child1 + .something__child2--mod,
-            .something__child1 + .something__child3--mod {
-                font-size: 3em;
-            }
-        }
-    }
+                        .something__child1 + .something__child2--mod,
+                        .something__child1 + .something__child3--mod {
+                                font-size: 3em;
+                        }
+                }
+        }
 
-    @include assert('in related elements, 1 element, 1 & selector') { /// 15 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1') {
-                    @include bem.next-elem('child2', 'child3') {
-                        @include bem.multi('elem:' 'subchild', '&') {
-                            font-size: 4em;
+        @include assert('in related elements, 1 element, 1 & selector') { /// 15 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1') {
+                                        @include bem.next-elem('child2', 'child3') {
+                                                @include bem.multi('elem:' 'subchild', '&') {
+                                                        font-size: 4em;
 
-                            @include bem.modifier('mod') {
-                                font-size: 4.5em;
-                            }
-                        }
-                    }
-                }
-            }
-        }
+                                                        @include bem.modifier('mod') {
+                                                                font-size: 4.5em;
+                                                        }
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child2 .something__subchild,
-            .something__child1 + .something__child3 .something__subchild {
-                font-size: 4em;
-            }
+                @include expect {
+                        .something__child1 + .something__child2 .something__subchild,
+                        .something__child1 + .something__child3 .something__subchild {
+                                font-size: 4em;
+                        }
 
-            .something__child1 + .something__child2 .something__subchild--mod,
-            .something__child1 + .something__child3 .something__subchild--mod {
-                font-size: 4.5em;
-            }
+                        .something__child1 + .something__child2 .something__subchild--mod,
+                        .something__child1 + .something__child3 .something__subchild--mod {
+                                font-size: 4.5em;
+                        }
 
-            .something__child1 + .something__child2,
-            .something__child1 + .something__child3 {
-                font-size: 4em;
-            }
+                        .something__child1 + .something__child2,
+                        .something__child1 + .something__child3 {
+                                font-size: 4em;
+                        }
 
-            .something__child1 + .something__child2--mod,
-            .something__child1 + .something__child3--mod {
-                font-size: 4.5em;
-            }
-        }
-    }
+                        .something__child1 + .something__child2--mod,
+                        .something__child1 + .something__child3--mod {
+                                font-size: 4.5em;
+                        }
+                }
+        }
 
-    @include assert('in element, 2 related elements, 1 modifier') { /// 16 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1') {
-                    @include bem.multi('next-elem:' 'child2' 'child3', 'modifier:' 'mod1') {
-                        font-size: 3em;
+        @include assert('in element, 2 related elements, 1 modifier') { /// 16 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1') {
+                                        @include bem.multi('next-elem:' 'child2' 'child3', 'modifier:' 'mod1') {
+                                                font-size: 3em;
 
-                        @include bem.modifier('mod2') {
-                            font-size: 3.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('mod2') {
+                                                        font-size: 3.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child2,
-            .something__child1 + .something__child3 {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child1 + .something__child2,
+                        .something__child1 + .something__child3 {
+                                font-size: 3em;
+                        }
 
-            .something__child1 + .something__child2--mod2,
-            .something__child1 + .something__child3--mod2 {
-                font-size: 3.5em;
-            }
+                        .something__child1 + .something__child2--mod2,
+                        .something__child1 + .something__child3--mod2 {
+                                font-size: 3.5em;
+                        }
 
-            .something__child1--mod1 {
-                font-size: 3em;
-            }
+                        .something__child1--mod1 {
+                                font-size: 3em;
+                        }
 
-            .something__child1--mod1.something__child1--mod2 {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child1--mod1.something__child1--mod2 {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 
-    @include assert('in element, 1 twin element, 1 modifier') { /// 17 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.multi('next-twin-elem', 'modifier:' 'mod1') {
-                        font-size: 3em;
+        @include assert('in element, 1 twin element, 1 modifier') { /// 17 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.multi('next-twin-elem', 'modifier:' 'mod1') {
+                                                font-size: 3em;
 
-                        @include bem.modifier('mod2') {
-                            font-size: 3.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('mod2') {
+                                                        font-size: 3.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child + .something__child {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child + .something__child {
+                                font-size: 3em;
+                        }
 
-            .something__child + .something__child--mod2 {
-                font-size: 3.5em;
-            }
+                        .something__child + .something__child--mod2 {
+                                font-size: 3.5em;
+                        }
 
-            .something__child--mod1 {
-                font-size: 3em;
-            }
+                        .something__child--mod1 {
+                                font-size: 3em;
+                        }
 
-            .something__child--mod1.something__child--mod2 {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child--mod1.something__child--mod2 {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 
-    @include assert('in multiple elements, 1 twin element, 1 modifier') { /// 18 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.multi('next-twin-elem', 'modifier:' 'mod1') {
-                        font-size: 3em;
+        @include assert('in multiple elements, 1 twin element, 1 modifier') { /// 18 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.multi('next-twin-elem', 'modifier:' 'mod1') {
+                                                font-size: 3em;
 
-                        @include bem.modifier('mod2') {
-                            font-size: 3.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.modifier('mod2') {
+                                                        font-size: 3.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child1,
-            .something__child2 + .something__child2 {
-                font-size: 3em;
-            }
+                @include expect {
+                        .something__child1 + .something__child1,
+                        .something__child2 + .something__child2 {
+                                font-size: 3em;
+                        }
 
-            .something__child1 + .something__child1--mod2,
-            .something__child2 + .something__child2--mod2 {
-                font-size: 3.5em;
-            }
+                        .something__child1 + .something__child1--mod2,
+                        .something__child2 + .something__child2--mod2 {
+                                font-size: 3.5em;
+                        }
 
-            .something__child1--mod1,
-            .something__child2--mod1 {
-                font-size: 3em;
-            }
+                        .something__child1--mod1,
+                        .something__child2--mod1 {
+                                font-size: 3em;
+                        }
 
-            .something__child1--mod1.something__child1--mod2,
-            .something__child2--mod1.something__child2--mod2 {
-                font-size: 3.5em;
-            }
-        }
-    }
+                        .something__child1--mod1.something__child1--mod2,
+                        .something__child2--mod1.something__child2--mod2 {
+                                font-size: 3.5em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_next-twin-element.scss b/test/bem/_next-twin-element.scss
index 355e635..3365a0b 100644
--- a/test/bem/_next-twin-element.scss
+++ b/test/bem/_next-twin-element.scss
@@ -14,143 +14,143 @@
 //
 
 @include it('next-twin-elem') {
-    @include assert('single element') { /// 1 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.next-twin-elem {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('single element') { /// 1 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.next-twin-elem {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child + .something__child {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child + .something__child {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, manual selector in-between') { /// 2 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    &:hover {
-                        @include bem.next-twin-elem {
-                            font-size: 2em;
-                        }
-                    }
+        @include assert('single element, manual selector in-between') { /// 2 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        &:hover {
+                                                @include bem.next-twin-elem {
+                                                        font-size: 2em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.next-twin-elem {
-                            font-size: 2em;
-                        }
-                    }
-                }
-            }
-        }
+                                        .test & {
+                                                @include bem.next-twin-elem {
+                                                        font-size: 2em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child:hover + .something__child {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something__child:hover + .something__child {
+                                font-size: 2em;
+                        }
 
-            .test .something__child + .something__child {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child + .something__child {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, modifier in-between') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.modifier('mod') {
-                        @include bem.next-twin-elem {
-                            font-size: 2.5em;
-                        }
-                    }
-                }
-            }
-        }
+        @include assert('single element, modifier in-between') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.modifier('mod') {
+                                                @include bem.next-twin-elem {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child--mod + .something__child {
-                font-size: 2.5em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child--mod + .something__child {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.next-twin-elem {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+        @include assert('multiple elements') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.next-twin-elem {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__child1,
-            .something__child2 + .something__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child1 + .something__child1,
+                        .something__child2 + .something__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, manual selector in-between') { /// 5 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    &:hover {
-                        @include bem.next-twin-elem {
-                            font-size: 2em;
-                        }
-                    }
+        @include assert('multiple elements, manual selector in-between') { /// 5 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        &:hover {
+                                                @include bem.next-twin-elem {
+                                                        font-size: 2em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.next-twin-elem {
-                            font-size: 2em;
-                        }
-                    }
-                }
-            }
-        }
+                                        .test & {
+                                                @include bem.next-twin-elem {
+                                                        font-size: 2em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child1:hover + .something__child1,
-            .something__child2:hover + .something__child2 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something__child1:hover + .something__child1,
+                        .something__child2:hover + .something__child2 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child1 + .something__child1,
-            .test .something__child2 + .something__child2 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child1 + .something__child1,
+                        .test .something__child2 + .something__child2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, modifier in-between') { /// 6 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.modifier('mod') {
-                        @include bem.next-twin-elem {
-                            font-size: 2.5em;
-                        }
-                    }
-                }
-            }
-        }
+        @include assert('multiple elements, modifier in-between') { /// 6 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.modifier('mod') {
+                                                @include bem.next-twin-elem {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1--mod + .something__child1,
-            .something__child2--mod + .something__child2 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child1--mod + .something__child1,
+                        .something__child2--mod + .something__child2 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_related-element.scss b/test/bem/_related-element.scss
index 5a829e8..48b3457 100644
--- a/test/bem/_related-element.scss
+++ b/test/bem/_related-element.scss
@@ -20,443 +20,443 @@
 //
 
 @include it('related-element') {
-    @include assert('single element, single related element') { /// 1 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.related-elem('+', 'subchild1') {
-                        font-size: 2em;
-                    }
+        @include assert('single element, single related element') { /// 1 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.related-elem('+', 'subchild1') {
+                                                font-size: 2em;
+                                        }
 
-                    @include bem.related-elem('~', 'subchild2') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+                                        @include bem.related-elem('~', 'subchild2') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child + .something__subchild1 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child + .something__subchild1 {
+                                font-size: 2em;
+                        }
 
-            .something__child ~ .something__subchild2 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .something__child ~ .something__subchild2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, single related element, manual selector in-between') { /// 2 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    &:hover {
-                        @include bem.related-elem('+', 'subchild1') {
-                            font-size: 2em;
-                        }
+        @include assert('single element, single related element, manual selector in-between') { /// 2 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        &:hover {
+                                                @include bem.related-elem('+', 'subchild1') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild2') {
-                            font-size: 2em;
-                        }
-                    }
+                                                @include bem.related-elem('~', 'subchild2') {
+                                                        font-size: 2em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.related-elem('+', 'subchild3') {
-                            font-size: 2em;
-                        }
+                                        .test & {
+                                                @include bem.related-elem('+', 'subchild3') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild4') {
-                            font-size: 2em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild4') {
+                                                        font-size: 2em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child:hover + .something__subchild1 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something__child:hover + .something__subchild1 {
+                                font-size: 2em;
+                        }
 
-            .something__child:hover ~ .something__subchild2 {
-                font-size: 2em;
-            }
+                        .something__child:hover ~ .something__subchild2 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child + .something__subchild3 {
-                font-size: 2em;
-            }
+                        .test .something__child + .something__subchild3 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child ~ .something__subchild4 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child ~ .something__subchild4 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('single element, single related element, modifier in-between') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.modifier('mod') {
-                        @include bem.related-elem('+', 'subchild1') {
-                            font-size: 2.5em;
-                        }
+        @include assert('single element, single related element, modifier in-between') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.modifier('mod') {
+                                                @include bem.related-elem('+', 'subchild1') {
+                                                        font-size: 2.5em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild2') {
-                            font-size: 2.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild2') {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child--mod + .something__subchild1 {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child--mod + .something__subchild1 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child--mod ~ .something__subchild2 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something__child--mod ~ .something__subchild2 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('single element, multiple related elements') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.related-elem('+', 'subchild1', 'subchild2') {
-                        font-size: 2.5em;
-                    }
+        @include assert('single element, multiple related elements') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.related-elem('+', 'subchild1', 'subchild2') {
+                                                font-size: 2.5em;
+                                        }
 
-                    @include bem.related-elem('~', 'subchild3', 'subchild4') {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+                                        @include bem.related-elem('~', 'subchild3', 'subchild4') {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child + .something__subchild1,
-            .something__child + .something__subchild2 {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child + .something__subchild1,
+                        .something__child + .something__subchild2 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child ~ .something__subchild3,
-            .something__child ~ .something__subchild4 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something__child ~ .something__subchild3,
+                        .something__child ~ .something__subchild4 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('single element, multiple related elements, manual selector in-between') { /// 5 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    &:hover {
-                        @include bem.related-elem('+', 'subchild1', 'subchild2') {
-                            font-size: 2.5em;
-                        }
+        @include assert('single element, multiple related elements, manual selector in-between') { /// 5 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        &:hover {
+                                                @include bem.related-elem('+', 'subchild1', 'subchild2') {
+                                                        font-size: 2.5em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild3', 'subchild4') {
-                            font-size: 2.5em;
-                        }
-                    }
+                                                @include bem.related-elem('~', 'subchild3', 'subchild4') {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.related-elem('+', 'subchild5', 'subchild6') {
-                            font-size: 2.5em;
-                        }
+                                        .test & {
+                                                @include bem.related-elem('+', 'subchild5', 'subchild6') {
+                                                        font-size: 2.5em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild7', 'subchild8') {
-                            font-size: 2.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild7', 'subchild8') {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child:hover + .something__subchild1,
-            .something__child:hover + .something__subchild2 {
-                font-size: 2.5em;
-            }
+                @include expect(false) {
+                        .something__child:hover + .something__subchild1,
+                        .something__child:hover + .something__subchild2 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child:hover ~ .something__subchild3,
-            .something__child:hover ~ .something__subchild4 {
-                font-size: 2.5em;
-            }
+                        .something__child:hover ~ .something__subchild3,
+                        .something__child:hover ~ .something__subchild4 {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child + .something__subchild5,
-            .test .something__child + .something__subchild6 {
-                font-size: 2.5em;
-            }
+                        .test .something__child + .something__subchild5,
+                        .test .something__child + .something__subchild6 {
+                                font-size: 2.5em;
+                        }
 
-            .test .something__child ~ .something__subchild7,
-            .test .something__child ~ .something__subchild8 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .test .something__child ~ .something__subchild7,
+                        .test .something__child ~ .something__subchild8 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('single element, multiple related elements, modifier in-between') { /// 6 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.modifier('mod') {
-                        @include bem.related-elem('+', 'subchild1', 'subchild2') {
-                            font-size: 2.5em;
-                        }
+        @include assert('single element, multiple related elements, modifier in-between') { /// 6 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.modifier('mod') {
+                                                @include bem.related-elem('+', 'subchild1', 'subchild2') {
+                                                        font-size: 2.5em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild3', 'subchild4') {
-                            font-size: 2.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild3', 'subchild4') {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child--mod + .something__subchild1,
-            .something__child--mod + .something__subchild2 {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child--mod + .something__subchild1,
+                        .something__child--mod + .something__subchild2 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child--mod ~ .something__subchild3,
-            .something__child--mod ~ .something__subchild4 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something__child--mod ~ .something__subchild3,
+                        .something__child--mod ~ .something__subchild4 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, single related element') { /// 7 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.related-elem('+', 'subchild1') {
-                        font-size: 2em;
-                    }
+        @include assert('multiple elements, single related element') { /// 7 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.related-elem('+', 'subchild1') {
+                                                font-size: 2em;
+                                        }
 
-                    @include bem.related-elem('~', 'subchild2') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+                                        @include bem.related-elem('~', 'subchild2') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__subchild1,
-            .something__child2 + .something__subchild1 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child1 + .something__subchild1,
+                        .something__child2 + .something__subchild1 {
+                                font-size: 2em;
+                        }
 
-            .something__child1 ~ .something__subchild2,
-            .something__child2 ~ .something__subchild2 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .something__child1 ~ .something__subchild2,
+                        .something__child2 ~ .something__subchild2 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, single related element, manual selector in-between') { /// 8 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    &:hover {
-                        @include bem.related-elem('+', 'subchild1') {
-                            font-size: 2em;
-                        }
+        @include assert('multiple elements, single related element, manual selector in-between') { /// 8 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        &:hover {
+                                                @include bem.related-elem('+', 'subchild1') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild2') {
-                            font-size: 2em;
-                        }
-                    }
+                                                @include bem.related-elem('~', 'subchild2') {
+                                                        font-size: 2em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.related-elem('+', 'subchild3') {
-                            font-size: 2em;
-                        }
+                                        .test & {
+                                                @include bem.related-elem('+', 'subchild3') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild4') {
-                            font-size: 2em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild4') {
+                                                        font-size: 2em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child1:hover + .something__subchild1,
-            .something__child2:hover + .something__subchild1 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something__child1:hover + .something__subchild1,
+                        .something__child2:hover + .something__subchild1 {
+                                font-size: 2em;
+                        }
 
-            .something__child1:hover ~ .something__subchild2,
-            .something__child2:hover ~ .something__subchild2 {
-                font-size: 2em;
-            }
+                        .something__child1:hover ~ .something__subchild2,
+                        .something__child2:hover ~ .something__subchild2 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child1 + .something__subchild3,
-            .test .something__child2 + .something__subchild3 {
-                font-size: 2em;
-            }
+                        .test .something__child1 + .something__subchild3,
+                        .test .something__child2 + .something__subchild3 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child1 ~ .something__subchild4,
-            .test .something__child2 ~ .something__subchild4 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child1 ~ .something__subchild4,
+                        .test .something__child2 ~ .something__subchild4 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, single related element, modifier in-between') { /// 9 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.modifier('mod') {
-                        @include bem.related-elem('+', 'subchild1') {
-                            font-size: 2.5em;
-                        }
+        @include assert('multiple elements, single related element, modifier in-between') { /// 9 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.modifier('mod') {
+                                                @include bem.related-elem('+', 'subchild1') {
+                                                        font-size: 2.5em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild2') {
-                            font-size: 2.5em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild2') {
+                                                        font-size: 2.5em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1--mod + .something__subchild1,
-            .something__child2--mod + .something__subchild1 {
-                font-size: 2.5em;
-            }
+                @include expect {
+                        .something__child1--mod + .something__subchild1,
+                        .something__child2--mod + .something__subchild1 {
+                                font-size: 2.5em;
+                        }
 
-            .something__child1--mod ~ .something__subchild2,
-            .something__child2--mod ~ .something__subchild2 {
-                font-size: 2.5em;
-            }
-        }
-    }
+                        .something__child1--mod ~ .something__subchild2,
+                        .something__child2--mod ~ .something__subchild2 {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, multiple related elements') { /// 10 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.related-elem('+', 'subchild1', 'subchild2') {
-                        font-size: 2em;
-                    }
+        @include assert('multiple elements, multiple related elements') { /// 10 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.related-elem('+', 'subchild1', 'subchild2') {
+                                                font-size: 2em;
+                                        }
 
-                    @include bem.related-elem('~', 'subchild3', 'subchild4') {
-                        font-size: 2em;
-                    }
-                }
-            }
-        }
+                                        @include bem.related-elem('~', 'subchild3', 'subchild4') {
+                                                font-size: 2em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1 + .something__subchild1,
-            .something__child2 + .something__subchild1,
-            .something__child1 + .something__subchild2,
-            .something__child2 + .something__subchild2 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child1 + .something__subchild1,
+                        .something__child2 + .something__subchild1,
+                        .something__child1 + .something__subchild2,
+                        .something__child2 + .something__subchild2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1 ~ .something__subchild3,
-            .something__child2 ~ .something__subchild3,
-            .something__child1 ~ .something__subchild4,
-            .something__child2 ~ .something__subchild4 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .something__child1 ~ .something__subchild3,
+                        .something__child2 ~ .something__subchild3,
+                        .something__child1 ~ .something__subchild4,
+                        .something__child2 ~ .something__subchild4 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, multiple related elements, manual selector in-between') { /// 11 ///
-        @include output(false) {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    &:hover {
-                        @include bem.related-elem('+', 'subchild1', 'subchild2') {
-                            font-size: 2em;
-                        }
+        @include assert('multiple elements, multiple related elements, manual selector in-between') { /// 11 ///
+                @include output(false) {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        &:hover {
+                                                @include bem.related-elem('+', 'subchild1', 'subchild2') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild3', 'subchild4') {
-                            font-size: 2em;
-                        }
-                    }
+                                                @include bem.related-elem('~', 'subchild3', 'subchild4') {
+                                                        font-size: 2em;
+                                                }
+                                        }
 
-                    .test & {
-                        @include bem.related-elem('+', 'subchild5', 'subchild6') {
-                            font-size: 2em;
-                        }
+                                        .test & {
+                                                @include bem.related-elem('+', 'subchild5', 'subchild6') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild7', 'subchild8') {
-                            font-size: 2em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild7', 'subchild8') {
+                                                        font-size: 2em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect(false) {
-            .something__child1:hover + .something__subchild1,
-            .something__child2:hover + .something__subchild1,
-            .something__child1:hover + .something__subchild2,
-            .something__child2:hover + .something__subchild2 {
-                font-size: 2em;
-            }
+                @include expect(false) {
+                        .something__child1:hover + .something__subchild1,
+                        .something__child2:hover + .something__subchild1,
+                        .something__child1:hover + .something__subchild2,
+                        .something__child2:hover + .something__subchild2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1:hover ~ .something__subchild3,
-            .something__child2:hover ~ .something__subchild3,
-            .something__child1:hover ~ .something__subchild4,
-            .something__child2:hover ~ .something__subchild4 {
-                font-size: 2em;
-            }
+                        .something__child1:hover ~ .something__subchild3,
+                        .something__child2:hover ~ .something__subchild3,
+                        .something__child1:hover ~ .something__subchild4,
+                        .something__child2:hover ~ .something__subchild4 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child1 + .something__subchild5,
-            .test .something__child2 + .something__subchild5,
-            .test .something__child1 + .something__subchild6,
-            .test .something__child2 + .something__subchild6 {
-                font-size: 2em;
-            }
+                        .test .something__child1 + .something__subchild5,
+                        .test .something__child2 + .something__subchild5,
+                        .test .something__child1 + .something__subchild6,
+                        .test .something__child2 + .something__subchild6 {
+                                font-size: 2em;
+                        }
 
-            .test .something__child1 ~ .something__subchild7,
-            .test .something__child2 ~ .something__subchild7,
-            .test .something__child1 ~ .something__subchild8,
-            .test .something__child2 ~ .something__subchild8 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .test .something__child1 ~ .something__subchild7,
+                        .test .something__child2 ~ .something__subchild7,
+                        .test .something__child1 ~ .something__subchild8,
+                        .test .something__child2 ~ .something__subchild8 {
+                                font-size: 2em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, multiple related elements, modifier in-between') { /// 12 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.modifier('mod') {
-                        @include bem.related-elem('+', 'subchild1', 'subchild2') {
-                            font-size: 2em;
-                        }
+        @include assert('multiple elements, multiple related elements, modifier in-between') { /// 12 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.modifier('mod') {
+                                                @include bem.related-elem('+', 'subchild1', 'subchild2') {
+                                                        font-size: 2em;
+                                                }
 
-                        @include bem.related-elem('~', 'subchild3', 'subchild4') {
-                            font-size: 2em;
-                        }
-                    }
-                }
-            }
-        }
+                                                @include bem.related-elem('~', 'subchild3', 'subchild4') {
+                                                        font-size: 2em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1--mod + .something__subchild1,
-            .something__child2--mod + .something__subchild1,
-            .something__child1--mod + .something__subchild2,
-            .something__child2--mod + .something__subchild2 {
-                font-size: 2em;
-            }
+                @include expect {
+                        .something__child1--mod + .something__subchild1,
+                        .something__child2--mod + .something__subchild1,
+                        .something__child1--mod + .something__subchild2,
+                        .something__child2--mod + .something__subchild2 {
+                                font-size: 2em;
+                        }
 
-            .something__child1--mod ~ .something__subchild3,
-            .something__child2--mod ~ .something__subchild3,
-            .something__child1--mod ~ .something__subchild4,
-            .something__child2--mod ~ .something__subchild4 {
-                font-size: 2em;
-            }
-        }
-    }
+                        .something__child1--mod ~ .something__subchild3,
+                        .something__child2--mod ~ .something__subchild3,
+                        .something__child1--mod ~ .something__subchild4,
+                        .something__child2--mod ~ .something__subchild4 {
+                                font-size: 2em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_state.scss b/test/bem/_state.scss
index 674da5f..5a1e1d6 100644
--- a/test/bem/_state.scss
+++ b/test/bem/_state.scss
@@ -14,167 +14,167 @@
 //
 
 @include it('state') {
-    @include assert('single block, single state') { /// 1 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.is('active') {
-                    font-size: 1.25em;
-                }
+        @include assert('single block, single state') { /// 1 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.is('active') {
+                                        font-size: 1.25em;
+                                }
 
-                @include bem.has('state') {
-                    font-size: 1.75em;
-                }
-            }
-        }
+                                @include bem.has('state') {
+                                        font-size: 1.75em;
+                                }
+                        }
+                }
 
-        @include expect {
-            .something.is-active {
-                font-size: 1.25em;
-            }
+                @include expect {
+                        .something.is-active {
+                                font-size: 1.25em;
+                        }
 
-            .something.has-state {
-                font-size: 1.75em;
-            }
-        }
-    }
+                        .something.has-state {
+                                font-size: 1.75em;
+                        }
+                }
+        }
 
-    @include assert('single element, single state') { /// 2 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.is('active') {
-                        font-size: 2.25em;
-                    }
+        @include assert('single element, single state') { /// 2 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.is('active') {
+                                                font-size: 2.25em;
+                                        }
 
-                    @include bem.has('state') {
-                        font-size: 2.75em;
-                    }
-                }
-            }
-        }
+                                        @include bem.has('state') {
+                                                font-size: 2.75em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child.is-active {
-                font-size: 2.25em;
-            }
+                @include expect {
+                        .something__child.is-active {
+                                font-size: 2.25em;
+                        }
 
-            .something__child.has-state {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child.has-state {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('single block, multiple states') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.is('active', 'primary') {
-                    font-size: 1.25em;
-                }
+        @include assert('single block, multiple states') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.is('active', 'primary') {
+                                        font-size: 1.25em;
+                                }
 
-                @include bem.has('state', 'indicator') {
-                    font-size: 1.75em;
-                }
-            }
-        }
+                                @include bem.has('state', 'indicator') {
+                                        font-size: 1.75em;
+                                }
+                        }
+                }
 
-        @include expect {
-            .something.is-active,
-            .something.is-primary {
-                font-size: 1.25em;
-            }
+                @include expect {
+                        .something.is-active,
+                        .something.is-primary {
+                                font-size: 1.25em;
+                        }
 
-            .something.has-state,
-            .something.has-indicator {
-                font-size: 1.75em;
-            }
-        }
-    }
+                        .something.has-state,
+                        .something.has-indicator {
+                                font-size: 1.75em;
+                        }
+                }
+        }
 
-    @include assert('single element, multiple states') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.is('active', 'primary') {
-                        font-size: 2.25em;
-                    }
+        @include assert('single element, multiple states') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.is('active', 'primary') {
+                                                font-size: 2.25em;
+                                        }
 
-                    @include bem.has('state', 'indicator') {
-                        font-size: 2.75em;
-                    }
-                }
-            }
-        }
+                                        @include bem.has('state', 'indicator') {
+                                                font-size: 2.75em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child.is-active,
-            .something__child.is-primary {
-                font-size: 2.25em;
-            }
+                @include expect {
+                        .something__child.is-active,
+                        .something__child.is-primary {
+                                font-size: 2.25em;
+                        }
 
-            .something__child.has-state,
-            .something__child.has-indicator {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child.has-state,
+                        .something__child.has-indicator {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, single state') { /// 5 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.is('active') {
-                        font-size: 2.25em;
-                    }
+        @include assert('multiple elements, single state') { /// 5 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.is('active') {
+                                                font-size: 2.25em;
+                                        }
 
-                    @include bem.has('state') {
-                        font-size: 2.75em;
-                    }
-                }
-            }
-        }
+                                        @include bem.has('state') {
+                                                font-size: 2.75em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1.is-active,
-            .something__child2.is-active {
-                font-size: 2.25em;
-            }
+                @include expect {
+                        .something__child1.is-active,
+                        .something__child2.is-active {
+                                font-size: 2.25em;
+                        }
 
-            .something__child1.has-state,
-            .something__child2.has-state {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child1.has-state,
+                        .something__child2.has-state {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('multiple elements, multiple states') { /// 6 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.is('active', 'primary') {
-                        font-size: 2.25em;
-                    }
+        @include assert('multiple elements, multiple states') { /// 6 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.is('active', 'primary') {
+                                                font-size: 2.25em;
+                                        }
 
-                    @include bem.has('state', 'indicator') {
-                        font-size: 2.75em;
-                    }
-                }
-            }
-        }
+                                        @include bem.has('state', 'indicator') {
+                                                font-size: 2.75em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1.is-active,
-            .something__child2.is-active,
-            .something__child1.is-primary,
-            .something__child2.is-primary {
-                font-size: 2.25em;
-            }
+                @include expect {
+                        .something__child1.is-active,
+                        .something__child2.is-active,
+                        .something__child1.is-primary,
+                        .something__child2.is-primary {
+                                font-size: 2.25em;
+                        }
 
-            .something__child1.has-state,
-            .something__child2.has-state,
-            .something__child1.has-indicator,
-            .something__child2.has-indicator {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child1.has-state,
+                        .something__child2.has-state,
+                        .something__child1.has-indicator,
+                        .something__child2.has-indicator {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 }
diff --git a/test/bem/_suffix.scss b/test/bem/_suffix.scss
index 34f55b6..cfec25b 100644
--- a/test/bem/_suffix.scss
+++ b/test/bem/_suffix.scss
@@ -12,86 +12,86 @@
 //
 
 @include it('suffix') {
-    @include assert('block suffix') { /// 1 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.suffix('sm') {
-                    font-size: 1.5em;
-                }
-            }
-        }
+        @include assert('block suffix') { /// 1 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.suffix('sm') {
+                                        font-size: 1.5em;
+                                }
+                        }
+                }
 
-        @include expect {
-            .something\@sm {
-                font-size: 1.5em;
-            }
-        }
-    }
+                @include expect {
+                        .something\@sm {
+                                font-size: 1.5em;
+                        }
+                }
+        }
 
-    @include assert('element suffix') { /// 2 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child') {
-                    @include bem.suffix('sm') {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+        @include assert('element suffix') { /// 2 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child') {
+                                        @include bem.suffix('sm') {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child\@sm {
-                font-size: 2.5em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child\@sm {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 
-    @include assert('modifier suffix') { /// 3 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.modifier('mod1') {
-                    @include bem.suffix('sm') {
-                        font-size: 1.75em;
-                    }
-                }
+        @include assert('modifier suffix') { /// 3 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.modifier('mod1') {
+                                        @include bem.suffix('sm') {
+                                                font-size: 1.75em;
+                                        }
+                                }
 
-                @include bem.elem('child') {
-                    @include bem.modifier('mod2') {
-                        @include bem.suffix('sm') {
-                            font-size: 2.75em;
-                        }
-                    }
-                }
-            }
-        }
+                                @include bem.elem('child') {
+                                        @include bem.modifier('mod2') {
+                                                @include bem.suffix('sm') {
+                                                        font-size: 2.75em;
+                                                }
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something--mod1\@sm {
-                font-size: 1.75em;
-            }
+                @include expect {
+                        .something--mod1\@sm {
+                                font-size: 1.75em;
+                        }
 
-            .something__child--mod2\@sm {
-                font-size: 2.75em;
-            }
-        }
-    }
+                        .something__child--mod2\@sm {
+                                font-size: 2.75em;
+                        }
+                }
+        }
 
-    @include assert('multiple element suffix') { /// 4 ///
-        @include output {
-            @include bem.block('something') {
-                @include bem.elem('child1', 'child2') {
-                    @include bem.suffix('sm') {
-                        font-size: 2.5em;
-                    }
-                }
-            }
-        }
+        @include assert('multiple element suffix') { /// 4 ///
+                @include output {
+                        @include bem.block('something') {
+                                @include bem.elem('child1', 'child2') {
+                                        @include bem.suffix('sm') {
+                                                font-size: 2.5em;
+                                        }
+                                }
+                        }
+                }
 
-        @include expect {
-            .something__child1\@sm,
-            .something__child2\@sm {
-                font-size: 2.5em;
-            }
-        }
-    }
+                @include expect {
+                        .something__child1\@sm,
+                        .something__child2\@sm {
+                                font-size: 2.5em;
+                        }
+                }
+        }
 }
diff --git a/test/test.js b/test/test.js
index 94d16da..cce331c 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,4 +1,4 @@
-const path     = require("path");
+const path = require("path");
 const sassTrue = require("sass-true");
 
-sassTrue.runSass({ file: path.join(__dirname, "test.scss") }, { describe, it });
+sassTrue.runSass({ describe, it }, path.join(__dirname, "test.scss"));
diff --git a/test/test.scss b/test/test.scss
index bddd801..39e369a 100644
--- a/test/test.scss
+++ b/test/test.scss
@@ -9,6 +9,6 @@ gradients.$easing-gradient-steps: 4;
 @import 'responsive';
 @import 'harmony';
 @import 'gradients';
-@import 'props';
+//@import 'props';
 
 @include report;