@mixin heading($font-size, $line-height:"tight", $font-weight:null, $from-md-font-size:null) {
  font-size: font-size($font-size);
  line-height: line-height($line-height);
  @include scheme-element-text-color(g800);

  @if $font-weight != null {
    font-weight: $font-weight;
  }

  @if $from-md-font-size != null {
    @include respond-from(md) {
      font-size: font-size($from-md-font-size);
    }
  }
}