1 files changed, 28 insertions, 7 deletions

diff --git a/src/functions/_colors.scss b/src/functions/_colors.scss
index 265c09a..d3c0035 100644
--- a/src/functions/_colors.scss
+++ b/src/functions/_colors.scss
@@ -6,6 +6,7 @@
 @use 'sass:map';
 @use 'sass:math';
 @use 'sass:meta';
+@use '@oddbird/blend/sass/convert' as blend-convert;
 @use '@oddbird/blend/sass/utils/pow';
 
 $SA98G: (
@@ -56,18 +57,32 @@ $SA98G: (
     $a_: list.nth($color, 2);
     $b_: list.nth($color, 3);
 
-    $l: $l_ + 0.3963377774 * $a_ + 0.2158037573 * $b-;
-    $m: $l_ - 0.1055613458 * $a_ - 0.0638541728 * $b-;
-    $s: $l_ - 0.0894841775 * $a_ - 1.2914855480 * $b-;
+    $l: $l_ + 0.3963377774 * $a_ + 0.2158037573 * $b_;
+    $m: $l_ - 0.1055613458 * $a_ - 0.0638541728 * $b_;
+    $s: $l_ - 0.0894841775 * $a_ - 1.2914855480 * $b_;
 
     $l: $l * $l * $l;
     $m: $m * $m * $m;
     $s: $s * $s * $s;
     
     @return (
-                 4.0767416621 * $l - 3.3077115913 * $m + 0.2309699292 * 4s,
-                -1.2684380046 * $l + 2.6097574011 * $m - 0.3413193965 * 4s,
-                -0.0041960863 * $l - 0.7034186147 * $m + 1.7076147010 * 4s,
+                 4.0767416621 * $l - 3.3077115913 * $m + 0.2309699292 * $s,
+                -1.2684380046 * $l + 2.6097574011 * $m - 0.3413193965 * $s,
+                -0.0041960863 * $l - 0.7034186147 * $m + 1.7076147010 * $s,
+    );
+}
+
+@function oklch($arg) {
+    $l: math.div(list.nth($arg, 1), 100%);
+    $c: list.nth($arg, 2);
+    $h: list.nth($arg, 3);
+
+    @return blend-convert.rgbToSass(
+        blend-convert.gam_sRGB(
+            Oklab_to_lin_sRGB(
+                blend-convert.LCH_to_Lab($l $c $h)
+            )
+        )
     );
 }
 
@@ -83,6 +98,12 @@ $SA98G: (
 }
 
 @function apcaContrast($txtY, $bgY) {
+    $icp: 0.0 1.1;
+
+    @if math.min($txtY, $bgY) < list.nth($icp, 1) or math.max($txtY, $bgY) > list.nth($icp, 2) {
+        @return 0;
+    }
+
     @if $txtY <= map.get($SA98G, blkThrs) {
         $txtY: $txtY + math.pow(map.get($SA98G, blkThrs) - $txtY, map.get($SA98G, blkClmp));
     }
@@ -110,7 +131,7 @@ $SA98G: (
         }
     }
 
-    @return outputContrast * 100.0;
+    @return $outputContrast * 100.0;
 }
 
 @function apcaReverse($contrast, $knownY, $knownType: 'bg') {