
// Functions to create color contrast
$linear-channel-values:
0
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1;

@function luminance($color) {
  $red: nth($linear-channel-values, red($color) + 1);
  $green: nth($linear-channel-values, green($color) + 1);
  $blue: nth($linear-channel-values, blue($color) + 1);

  @return .2126 * $red + .7152 * $green + .0722 * $blue;
}

@function contrast($back, $front) {
  $backLum: luminance($back) + .05;
  $foreLum: luminance($front) + .05;

  @return max($backLum, $foreLum) / min($backLum, $foreLum);
}

@function choose-contrast-color($color) {
  $lightContrast: contrast($color, white);
  $darkContrast: contrast($color, black);
  $deadzone: 10;

  @if ($lightContrast + $deadzone > $darkContrast) {
    @return var(--white-color);
  }
  @else {
    @return var(--black-color);
  }
}