// Color contrast
@function color-yiq($color) {
  $r: red($color);
  $g: green($color);
  $b: blue($color);

  $yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;

  @if ($yiq >= $yiq-contrasted-threshold) {
    @return $yiq-text-dark;
  }

  @else {
    @return $yiq-text-light;
  }
}

// Retrieve color Sass maps
@function color($key: "blue") {
  @return map-get($colors, $key);
}

// Minimum breakpoint width. Null for the smallest (first) breakpoint.
//
//    >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    576px
@function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
  $min: map-get($breakpoints, $name);

  @return if($min != 0, $min, null);
}

// Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.
// Useful for making responsive utilities.
//
//    >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    ""  (Returns a blank string)
//    >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    "-sm"
@function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
  @return if(breakpoint-min($name, $breakpoints) == null, "", "-#{$name}");
}


// Returns the value relative to `rem` for a given step
@function calc-step($step, $decay) {
  $times: ceil($step / $mc-step-multipliers);
  $level: if($step > $mc-step-multipliers, $step - $mc-step-multipliers + 1, $step);
  $factor: if($times > 1, $mc-step-scale, 1);
  $less: (max($step - $mc-step-min-resize, 0) * $decay) / $mc-step-base;
  $value: $level * $mc-step-scale * $factor / $mc-step-base;

  @return $value - $less * 1rem;
}