--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/default/assets/scss/vendors/bourbon/library/_shade.scss	Sat May 31 09:21:51 2025 +0800
@@ -0,0 +1,33 @@
+@charset "UTF-8";
+
+/// Mixes a color with black.
+///
+/// @argument {color} $color
+///
+/// @argument {number (percentage)} $percent
+///   The amount of black to be mixed in.
+///
+/// @return {color}
+///
+/// @example scss
+///   .element {
+///     background-color: shade(#ffbb52, 60%);
+///   }
+///
+///   // CSS Output
+///   .element {
+///     background-color: #664a20;
+///   }
+
+@function shade(
+    $color,
+    $percent
+  ) {
+
+  @if not _is-color($color) {
+    @error "`#{$color}` is not a valid color for the `$color` argument in " +
+           "the `shade` mixin.";
+  } @else {
+    @return mix(#000, $color, $percent);
+  }
+}