@use "sass:math";
@use "sass:string";

@use "settings";

// Gradient hack to get our custom underline to wrap:
// https://www.dannyguo.com/blog/animated-multiline-link-underlines-with-css/
@function underline-hack($color) {
  // [deprecated] Calculate lighter underline color compared to text
  // color by mix()'ing with background (#fff) to give the impression
  // of opacity but with MUCH better compatibility.
  // $color-opaque-hex: mix($color, $link-opacity-color, $link-underline-opacity);

  // Less compatible but better for light/dark mode switching.
  // We fall back to non-alpha hex colors with postcss-color-rgba-fallback to mitigate this.
  $color-opaque-alpha: rgba($color, math.div(settings.$link-underline-opacity, 100%));

  // Return non-gradient linear-gradient():
  @return linear-gradient($color-opaque-alpha, $color-opaque-alpha);
}

// Web fonts (see components/_typography.scss)
@mixin font-face(
  $family,
  $src,
  $weight: normal,
  $style: normal,
  $display: swap,
  $variable: false,
  $base-path: "../fonts/"
) {
  @font-face {
    font-family: string.quote($family);
    font-style: $style;
    font-weight: $weight;
    font-display: $display;

    @if $variable {
      // all browsers that support variable fonts also support woff2, so a woff file is unncessary
      // draft spec for formats: https://www.w3.org/TR/css-fonts-4/#src-desc
      src: url($base-path + $src + ".woff2") format("woff2-variations"),
        url($base-path + $src + ".woff2") format("woff2");
    } @else {
      src: url($base-path + $src + ".woff2") format("woff2"), url($base-path + $src + ".woff") format("woff");
    }

    // Allow additional rules to be passed in:
    @content;
  }
}