@function cs-colorblind($color, $mode: $cs-colorblind) {

  // Refrence: http://www.w3.org/TR/AERT#color-contrast

  // Deuteranopia
  @if $mode == deuteranopia {
    @return $color;
  }

  // Protanopia
  @if $mode == protanopia {
    @return $color;
  }

  // Tritanopia
  @if $mode == tritanopia {
    @return $color;
  }


  // Return color if no color blind mode.
  @else {
    @return $color;
  }
}

@function cs-cb($color, $mode: $cs-colorblind) {
  @return cs-colorblind($color, $mode);
}