/// @type {Number}
$o-phi: 1.618034;


/// Get the golden ratio of `$number` recursively scaled
/// `$scale` times. A scale setting of less then 1 will return
/// the smaller portion.
///
/// @example scss
///   o-golden-ratio(30,  1) //=> 48.54102
///   o-golden-ratio(30,  2) //=> 78.54102
///   o-golden-ratio(30, -1) //=> 18.54102
///   o-golden-ratio(30, -2) //=> 11.45898
///
/// @param {Number} $number [100]
/// @param {Number} $scale [1]
/// @return {Number} The golden A as to `$number`, or C as to `$number` if `$scale` is < 0
/// @link http://codepen.io/Lokua/pen/JoRWRz/?editors=110
@function o-golden-ratio($number: 100, $scale: 1) {
  $ret: $number;
  $n: $scale;

  @if ($scale < 0) {
    @while ($n < 0) {
      $ret: $ret * ($o-phi - 1);
      $n: $n + 1;
    }
    @return $ret;
  }

  @if ($scale > 0) {
    @while ($n > 0) {
      $ret: $ret * $o-phi;
      $n: $n - 1;
    }
    @return $ret;
  }

  @return $number;
}

/// @alias o-golden-ratio
@function o-golden($number: 100, $scale: 1) {
  @return o-golden-ratio($number, $scale);
}