foundation-sites/scss/prototype/_font-styling.scss

// Foundation for Sites by ZURB
// foundation.zurb.com
// Licensed under MIT Open Source

////
/// @group prototype-font-styling
////

/// Responsive breakpoints for font styling types
/// @type Boolean
$prototype-font-breakpoints: $global-prototype-breakpoints !default;

/// Letter spacing for `.font-wide`
/// @type Number
$prototype-wide-letter-spacing: rem-calc(4) !default;

/// Default weight for `.font-normal`, defaulted to `global-weight-normal`
/// @type Number
$prototype-font-normal: $global-weight-normal !default;

/// Default weight for `.font-bold`, defaulted to `global-weight-bold`
/// @type Number
$prototype-font-bold: $global-weight-bold !default;

/// Font wide letter spacing!
/// @param {Number} $letter-spacing [$prototype-wide-letter-spacing] Wide letter spacing for the font
@mixin font-wide(
  $letter-spacing: $prototype-wide-letter-spacing
) {
  letter-spacing: $letter-spacing;
}

/// Font Weight Normal, default value coming through `global-weight-normal`
/// @param {Number} $weight [$prototype-font-normal] Weight of the font (normal)
@mixin font-normal(
  $weight: $prototype-font-normal
) {
  font-weight: $weight;
}

/// Font Weight Bold, default value coming through `global-weight-bold`
/// @param {Number} $weight [$prototype-font-bold] Weight of the font (bold)
@mixin font-bold(
  $weight: $prototype-font-bold
) {
  font-weight: $weight;
}

/// Font Style Italic
@mixin font-italic {
  font-style: italic !important;
}

@mixin foundation-prototype-font-styling {
  .font-wide{
    @include font-wide;
  }

  .font-normal {
    @include font-normal;
  }

  .font-bold {
    @include font-bold;
  }

  .font-italic {
    @include font-italic;
  }

  @if ($prototype-font-breakpoints) {
    // Loop through Responsive Breakpoints
    @each $size in $breakpoint-classes {
      @include breakpoint($size) {
        @if $size != $-zf-zero-breakpoint {
          .#{$size}-font-wide{
            @include font-wide;
          }

          .#{$size}-font-normal {
            @include font-normal;
          }

          .#{$size}-font-bold {
            @include font-bold;
          }

          .#{$size}-font-italic {
            @include font-italic;
          }
        }
      }
    }
  }
}