/// Get a color value from a color type name and variant
/// @access public
/// @param {String} $type - Color type's name
/// @param {String} $variant - Color variant's name
/// @return {Hex}
/// @require $colors, $color-key
@function color($type, $variant: $color-key) {
  @if not map-has-key($colors, $type) {
    @error 'There is no color type named `#{$type}` in $colors. '
           + 'Color type should be one of: #{map-keys($colors)}.';
  }

  $color-map: map-get($colors, $type);

  @if not map-has-key($color-map, $variant) {
    @error 'There is no color variant named `#{$variant}` in $color-map. '
           + 'variant should be one of: #{map-keys($color-map)}.';
  }

  @return map-get($color-map, $variant);
}

/// Get a font value from a font type name
/// @access public
/// @param {String} $type - Font type's name
/// @param {String} $variant - Font variant's name
/// @return {String}
/// @require $fonts, $font-key
@function font($type, $variant: $font-key) {
  @if not map-has-key($fonts, $type) {
    @error 'There is no font type named `#{$type}` in $fonts. '
           + 'Font type should be one of: #{map-keys($fonts)}.';
  }

  $font-map: map-get($fonts, $type);

  @if not map-has-key($font-map, $variant) {
    @error 'There is no font variant named `#{$variant}` in $font-map. '
           + 'variant should be one of: #{map-keys($font-map)}.';
  }

  @return map-get($font-map, $variant);
}