_golden-ratio.css.scss

@function golden-ratio($value, $increment) {
  @if $increment > 0 {
    @for $i from 1 through $increment {
      $value: ($value * 1.618);
    }
  }
  @if $increment < 0 {
    $increment: abs($increment);
    @for $i from 1 through $increment {
      $value: ($value / 1.618);
    }
  }
  @if $increment == 0 {
    @warn "Increment value cannot be zero; must be ...-3, -2, -1, 1, 2, 3...";
  }
  @return $value;
}

//  div {
//                      Increment Up GR with positive value
//    font-size:        golden-ratio(14px,  1);    // returns: 22.652px
//
//                      Increment Down GR with negative value
//    font-size:        golden-ratio(14px, -1);    // returns: 8.653px
//
//                     Can be used with ceil(round up) or floor(round down)
//    font-size: floor( golden-ratio(14px,  1) );  // returns: 22px
//    font-size:  ceil( golden-ratio(14px,  1) );  // returns: 23px
//  }
//
// modularscale.com
// goldenratiocalculator.com