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

//// /// @group functions ////

/// Creates a CSS triangle, which can be used for dropdown arrows, dropdown pips, and more. Use this mixin inside a `&::before` or `&::after` selector, to attach the triangle to an existing element. /// /// @param {Number} $triangle-size - Width of the triangle. /// @param {Color} $triangle-color - Color of the triangle. /// @param {Keyword} $triangle-direction - Direction the triangle points. Can be `up`, `right`, `down`, or `left`. @mixin css-triangle(

$triangle-size,
$triangle-color,
$triangle-direction

) {

content: '';
display: block;
width: 0;
height: 0;
border: inset $triangle-size;

@if ($triangle-direction == down) {
  border-color: $triangle-color transparent transparent;
  border-top-style: solid;
  border-bottom-width: 0;
}
@if ($triangle-direction == up) {
  border-color: transparent transparent $triangle-color;
  border-bottom-style: solid;
  border-top-width: 0;
}
@if ($triangle-direction == right) {
  border-color: transparent transparent transparent $triangle-color;
  border-left-style: solid;
  border-right-width: 0;
}
@if ($triangle-direction == left) {
  border-color: transparent $triangle-color transparent transparent;
  border-right-style: solid;
  border-left-width: 0;
}

}

/// Creates a menu icon with a set width, height, number of bars, and colors. The mixin uses the height of the icon and the weight of the bars to determine spacing. <div class=“docs-example-burger”></div> /// /// @param {Color} $color [$black] - Color to use for the icon. /// @param {Color} $color-hover [$dark-gray] - Color to use when the icon is hovered over. /// @param {Number} $width [20px] - Width of the icon. /// @param {Number} $height [16px] - Height of the icon. /// @param {Number} $weight [2px] - Height of individual bars in the icon. /// @param {Number} $bars [3] - Number of bars in the icon. @mixin hamburger(

$color: $black,
$color-hover: $dark-gray,
$width: 20px,
$height: 16px,
$weight: 2px,
$bars: 3

) {

// box-shadow CSS output
$shadow: ();
$hover-shadow: ();

// Spacing between bars is calculated based on the total height of the icon and the weight of each bar
$spacing: floor(($height - ($weight * $bars)) / ($bars - 1));

// Icon container
position: relative;
display: inline-block;
vertical-align: middle;
cursor: pointer;
width: $width;
height: $height;

// Icon bars
&::after {
  content: '';
  position: absolute;
  display: block;
  width: 100%;
  height: $weight;
  background: $color;
  top: 0;
  left: 0;

  @for $i from 2 through $bars {
    $offset: ($weight + $spacing) * ($i - 1);
    $shadow: append($shadow, 0 $offset 0 $color, comma);
  }

  box-shadow: $shadow;
}

// Hover state
@if $color-hover {
  // Generate CSS
  @for $i from 2 through $bars {
    $offset: ($weight + $spacing) * ($i - 1);
    $hover-shadow: append($hover-shadow, 0 $offset 0 $color-hover, comma);
  }

  &:hover::after {
    background: $color-hover;
    box-shadow: $hover-shadow;
  }
}

}

/// Adds a downward-facing triangle as a background image to an element. The image is formatted as an SVG, making it easy to change the color. Because Internet Explorer doesn't support encoded SVGs as background images, a PNG fallback is also included. /// There are two PNG fallbacks: a black triangle and a white triangle. The one used depends on the lightness of the input color. /// /// @param {Color} $color [$black] - Color to use for the triangle. @mixin background-triangle($color: $black) {

$rgb: 'rgb%28#{red($color)}, #{green($color)}, #{blue($color)}%29';

background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="32" height="24" viewBox="0 0 32 24"><polygon points="0,0 32,0 16,24" style="fill: #{$rgb}"></polygon></svg>');

@media screen and (min-width:0\0) {
  @if lightness($color) < 60% {
    // White triangle
    background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAYCAYAAACbU/80AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAIpJREFUeNrEkckNgDAMBBfRkEt0ObRBBdsGXUDgmQfK4XhH2m8czQAAy27R3tsw4Qfe2x8uOO6oYLb6GlOor3GF+swURAOmUJ+RwtEJs9WvTGEYxBXqI1MQAZhCfUQKRzDMVj+TwrAIV6jvSUEkYAr1LSkcyTBb/V+KYfX7xAeusq3sLDtGH3kEGACPWIflNZfhRQAAAABJRU5ErkJggg==');
  }
  @else {
    // Black triangle
    background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAYCAYAAACbU/80AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAMBJREFUeNrEllsOhCAMRVszC9IlzU7KCmVHTJsoMWYMUtpyv9BgbuXQB5ZSdgBYYY4ycgBivk8KYFsQMfMiTTBP4o3nUzCKzOabLJbLy2/g31evGkAginR4/ZegKH5qX3bJCscA3t0x3kgO5tQFyhhFf50xRqFLbyMUNJQzgyjGS/wgCpvKqkRBpuWrE4V9d+1E4dPUXqIg107SQOE/2DRQxMwTDygIInVDET9T3lCoj/6j/VCmGjZOl2lKpZ8AAwDQP7zIimDGFQAAAABJRU5ErkJggg==');
  }
}

}

/// Applies the micro clearfix hack popularized by Nicolas Gallagher. Include this mixin on a container if its children are all floated, to give the container a proper height. /// The clearfix is augmented with specific styles to prevent borders in flexbox environments /// @link nicolasgallagher.com/micro-clearfix-hack/ Micro Clearfix Hack /// @link danisadesigner.com/blog/flexbox-clear-fix-pseudo-elements/ Flexbox fix @mixin clearfix {

&::before,
&::after {
  content: ' ';
  display: table;
  flex-basis: 0;
  order: 1;
}

&::after {
  clear: both;
}

}

/// Adds CSS for a “quantity query” selector that automatically sizes elements based on how many there are inside a container. /// @link alistapart.com/article/quantity-queries-for-css Quantity Queries for CSS /// /// @param {Number} $max - Maximum number of items to detect. The higher this number is, the more CSS that's required to cover each number of items. /// @param {Keyword} $elem [li] - Tag to use for sibling selectors. @mixin auto-width($max, $elem: li) {

@for $i from 2 through $max {
  &:nth-last-child(#{$i}):first-child,
  &:nth-last-child(#{$i}):first-child ~ #{$elem} {
    width: percentage(1 / $i);
  }
}

}

/// Removes the focus ring around an element when a mouse input is detected. @mixin disable-mouse-outline {

[data-whatinput='mouse'] & {
  outline: 0;
}

}

/// Makes an element visually hidden, but still accessible to keyboards and assistive devices. /// @link snook.ca/archives/html_and_css/hiding-content-for-accessibility Hiding Content for Accessibility @mixin element-invisible {

position: absolute !important;
width: 1px;
height: 1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);

}

/// Reverses the CSS output created by the `element-invisible()` mixin. @mixin element-invisible-off {

position: static !important;
height: auto;
width: auto;
overflow: visible;
clip: auto;

}

/// Vertically centers the element inside of its first non-static parent, /// @link www.sitepoint.com/centering-with-sass/ Centering With Sass @mixin vertical-center {

position: absolute;
top: 50%;
transform: translateY(-50%);

}

/// Horizontally centers the element inside of its first non-static parent, /// @link www.sitepoint.com/centering-with-sass/ Centering With Sass @mixin horizontal-center {

position: absolute;
left: 50%;
transform: translateX(-50%);

}

/// Absolutely centers the element inside of its first non-static parent, /// @link www.sitepoint.com/centering-with-sass/ Centering With Sass @mixin absolute-center {

position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);

}

/// Iterates through breakpoints defined in `$breakpoint-classes` and prints the CSS inside the mixin at each breakpoint's media query. Use this with the grid, or any other component that has responsive classes. /// /// @param {Boolean} $small [true] - If `false`, the mixin will skip the `small` breakpoint. Use this with components that don't prefix classes with `small-`, only `medium-` and up. @mixin -zf-each-breakpoint($small: true) {

$map: $breakpoint-classes;

@if not $small {
  $map: map-remove($map, $-zf-zero-breakpoint);
}

@each $size in $map {
  $-zf-size: $size !global;

  @include breakpoint($size) {
    @content;
  }
}

}