$panel-margin: $block-spacing !default;
$panel-item-border: 1px solid $border-light !default;
$panel-radius: $radius-large !default;
$panel-shadow: 0 0.5em 1em -0.125em rgba($scheme-invert, 0.1), 0 0px 0 1px rgba($scheme-invert, 0.02) !default;

$panel-heading-background-color: $border-light !default;
$panel-heading-color: $text-strong !default;
$panel-heading-line-height: 1.25 !default;
$panel-heading-padding: 0.75em 1em !default;
$panel-heading-radius: $radius !default;
$panel-heading-size: 1.25em !default;
$panel-heading-weight: $weight-bold !default;

$panel-tabs-font-size: 0.875em !default;
$panel-tab-border-bottom: 1px solid $border !default;
$panel-tab-active-border-bottom-color: $link-active-border !default;
$panel-tab-active-color: $link-active !default;

$panel-list-item-color: $text !default;
$panel-list-item-hover-color: $link !default;

$panel-block-color: $text-strong !default;
$panel-block-hover-background-color: $background !default;
$panel-block-active-border-left-color: $link !default;
$panel-block-active-color: $link-active !default;
$panel-block-active-icon-color: $link !default;

$panel-icon-color: $text-light !default;
$panel-colors: $colors !default;

.panel {
  border-radius: $panel-radius;
  box-shadow: $panel-shadow;
  font-size: $size-normal;

  &:not(:last-child) {
    margin-bottom: $panel-margin;
  }

  // Colors
  @each $name, $components in $panel-colors {
    $color: nth($components, 1);
    $color-invert: nth($components, 2);

    &.is-#{$name} {
      .panel-heading {
        background-color: $color;
        color: $color-invert;
      }

      .panel-tabs a.is-active {
        border-bottom-color: $color;
      }

      .panel-block.is-active .panel-icon {
        color: $color;
      }
    }
  }
}

.panel-tabs,
.panel-block {
  &:not(:last-child) {
    border-bottom: $panel-item-border;
  }
}

.panel-heading {
  background-color: $panel-heading-background-color;
  border-radius: $panel-radius $panel-radius 0 0;
  color: $panel-heading-color;
  font-size: $panel-heading-size;
  font-weight: $panel-heading-weight;
  line-height: $panel-heading-line-height;
  padding: $panel-heading-padding;
}

.panel-tabs {
  align-items: flex-end;
  display: flex;
  font-size: $panel-tabs-font-size;
  justify-content: center;

  a {
    border-bottom: $panel-tab-border-bottom;
    margin-bottom: -1px;
    padding: 0.5em;

    // Modifiers
    &.is-active {
      border-bottom-color: $panel-tab-active-border-bottom-color;
      color: $panel-tab-active-color;
    }
  }
}

.panel-list {
  a {
    color: $panel-list-item-color;

    &:hover {
      color: $panel-list-item-hover-color;
    }
  }
}

.panel-block {
  align-items: center;
  color: $panel-block-color;
  display: flex;
  justify-content: flex-start;
  padding: 0.5em 0.75em;

  input[type="checkbox"] {
    margin-right: 0.75em;
  }

  & > .control {
    flex-grow: 1;
    flex-shrink: 1;
    width: 100%;
  }

  &.is-wrapped {
    flex-wrap: wrap;
  }

  &.is-active {
    border-left-color: $panel-block-active-border-left-color;
    color: $panel-block-active-color;

    .panel-icon {
      color: $panel-block-active-icon-color;
    }
  }

  &:last-child {
    border-bottom-left-radius: $panel-radius;
    border-bottom-right-radius: $panel-radius;
  }
}

a.panel-block,
label.panel-block {
  cursor: pointer;

  &:hover {
    background-color: $panel-block-hover-background-color;
  }
}

.panel-icon {
  @include fa(14px, 1em);

  color: $panel-icon-color;
  margin-right: 0.75em;

  .fa {
    font-size: inherit;
    line-height: inherit;
  }
}