@mixin shadow($size: 0 4px 8px, $color: rgba(0,0,0,.03)) {
  box-shadow: $size $color;
}

@mixin card_base($border-radius: 3px) {
  @include shadow();
  background-color: #fff;
  border-radius: $border-radius;
  border: none;
  position: relative;
  margin-bottom: 30px;
}

@mixin background_spinner($size: 80px) {
  background-image: url('../img/spinner.svg');
  background-size: $size;
  background-repeat: no-repeat;
  background-position: center;
}

@mixin overlay($z-index: 99, $background-color: rgba(255, 255, 255, 0.5)) {
  content: ' ';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: $background-color;
  z-index: $z-index;
}

@mixin box($width: 50px, $height: 50px, $line-height: 50px, $font-size: 20px, $border-radius: 3px) {
  width: $width;
  height: $height;
  border-radius: $border-radius;
  line-height: $line-height;
  font-size: $font-size;
  text-align: center;
}

@mixin shadow-lighten($color, $amount: 15%) {
  box-shadow: 0 2px 6px color_lighten($color, $amount);
}

@mixin button-shadow($color, $amount: 15%) {
  @include shadow-lighten($color, $amount);
}

@mixin icon-shadow($color, $amount: 15%) {
  box-shadow: 0 4px 8px color_lighten($color, $amount);
}

@mixin dropdown-indicator($content: '\f0d7') {
  content: $content;
  font-family: 'Font Awesome 5 Free';
  font-weight: 900;
  position: absolute;
  top: 50%;
  right: 20px;
  -webkit-transform: translate(0, -50%);
          transform: translate(0, -50%);
  font-size: 12px;
}

@mixin main-sidebar($z-index: 880) {
  position: fixed;
  top: 0;
  height: 100%;
  width: 250px;
  background-color: #fff;
  z-index: $z-index;
}

@mixin children-margin() {
  margin: 0 8px 10px 0;
}

@mixin form-control() {
  background-color: color_lighten(primary, 32.4%);
  border-color: color_lighten(primary, 27%);
}

@mixin form-control-focus() {
  background-color: color_lighten(primary, 32.8%);
  border-color: color_lighten(primary, 10%);
}

// Breakpoint viewport sizes and media queries.
//
// Breakpoints are defined as a map of (name: minimum width), order from small to large:
//
//    (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)
//
// The map defined in the `$grid-breakpoints` global variable is used as the `$breakpoints` argument by default.

// Name of the next breakpoint, or null for the last breakpoint.
//
//    >> breakpoint-next(sm)
//    md
//    >> breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    md
//    >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl))
//    md
@function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
  $n: index($breakpoint-names, $name);
  @return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
}

// 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);
}

// Maximum breakpoint width. Null for the largest (last) breakpoint.
// The maximum value is calculated as the minimum of the next one less 0.02px
// to work around the limitations of `min-` and `max-` prefixes and viewports with fractional widths.
// See https://www.w3.org/TR/mediaqueries-4/#mq-min-max
// Uses 0.02px rather than 0.01px to work around a current rounding bug in Safari.
// See https://bugs.webkit.org/show_bug.cgi?id=178261
//
//    >> breakpoint-max(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    767.98px
@function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
  $next: breakpoint-next($name, $breakpoints);
  @return if($next, breakpoint-min($next, $breakpoints) - .02px, 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}");
}

// Media of at least the minimum breakpoint width. No query for the smallest breakpoint.
// Makes the @content apply to the given breakpoint and wider.
@mixin media-breakpoint-up($name, $breakpoints: $grid-breakpoints) {
  $min: breakpoint-min($name, $breakpoints);
  @if $min {
    @media (min-width: $min) {
      @content;
    }
  } @else {
    @content;
  }
}

// Media of at most the maximum breakpoint width. No query for the largest breakpoint.
// Makes the @content apply to the given breakpoint and narrower.
@mixin media-breakpoint-down($name, $breakpoints: $grid-breakpoints) {
  $max: breakpoint-max($name, $breakpoints);
  @if $max {
    @media (max-width: $max) {
      @content;
    }
  } @else {
    @content;
  }
}

// Media that spans multiple breakpoint widths.
// Makes the @content apply between the min and max breakpoints
@mixin media-breakpoint-between($lower, $upper, $breakpoints: $grid-breakpoints) {
  $min: breakpoint-min($lower, $breakpoints);
  $max: breakpoint-max($upper, $breakpoints);

  @if $min != null and $max != null {
    @media (min-width: $min) and (max-width: $max) {
      @content;
    }
  } @else if $max == null {
    @include media-breakpoint-up($lower, $breakpoints) {
      @content;
    }
  } @else if $min == null {
    @include media-breakpoint-down($upper, $breakpoints) {
      @content;
    }
  }
}

// Media between the breakpoint's minimum and maximum widths.
// No minimum for the smallest breakpoint, and no maximum for the largest one.
// Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
@mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
  $min: breakpoint-min($name, $breakpoints);
  $max: breakpoint-max($name, $breakpoints);

  @if $min != null and $max != null {
    @media (min-width: $min) and (max-width: $max) {
      @content;
    }
  } @else if $max == null {
    @include media-breakpoint-up($name, $breakpoints) {
      @content;
    }
  } @else if $min == null {
    @include media-breakpoint-down($name, $breakpoints) {
      @content;
    }
  }
}