//
// @author      OA Wu <oawu.tw@gmail.com>
// @copyright   Copyright (c) 2015 - 2025, @oawu/scss
// @license     http://opensource.org/licenses/MIT  MIT License
// @link        https://www.ioa.tw/
//

@function brightness($color) {
  @if type-of($color) == color { @return (red($color) * 0.299 + green($color) * 0.587 + blue($color) * 0.114) / 255 * 100%; }
  @else { @return unquote("brightness(#{$color})"); }
}