miller-columns.scss

$govuk-include-default-font-face: false;
$govuk-new-link-styles: true;

@import "node_modules/govuk-frontend/dist/govuk/base";
@import "miller-columns-selected";

$mc-transition-time: 400ms;
$mc-selected-item-colour: govuk-colour("white");
$mc-selected-item-background: govuk-colour("dark-grey");
$mc-active-item-colour: govuk-colour("white");
$mc-active-item-background: govuk-colour("blue");

.js-enabled {
  // Hide nested lists
  .miller-columns {
    display: none;

    // Disable pointer events on checkboxes to prevent them from interfering with the miller-columns items
    .govuk-checkboxes__input,
    .govuk-checkboxes__label {
      pointer-events: none;
    }
  }
}

.miller-columns {
  display: block;
  width: 100%;
  height: 100%;
  @include govuk-responsive-margin(6, "bottom");
  outline: 0;
  font-size: 0;
  white-space: nowrap;
}

.miller-columns__column {
  display: none;
  width: 100%;
  height: 100%;
  vertical-align: top;
  white-space: normal;
  transition-duration: $mc-transition-time;
  transition-property: width;

  &.miller-columns__column--active {
    display: inline-block;
  }

  @include govuk-media-query($from: tablet) {
    display: inline-block;
    width: 33.3%;
    border-right: 1px solid $govuk-border-colour;
  }
}

.miller-columns__column--narrow {
  width: 16.6%;
  overflow-x: hidden;

  .miller-columns__item,
  .miller-columns__item label {
    white-space: nowrap;
  }

  .miller-columns__item--parent:after {
    display: none;
  }
}

.miller-columns__column--medium {
  width: 22.2%;
  overflow-x: hidden;

  .miller-columns__item,
  .miller-columns__item label {
    white-space: nowrap;
  }

  .miller-columns__item--parent:after {
    display: none;
  }
}

.miller-columns__column--collapse {
  display: none;
}

.miller-columns__column-heading {
  @include govuk-text-colour;
  @include govuk-font($size: 19, $weight: bold);
  margin-bottom: govuk-spacing(3);
  margin-top: 0;
  padding: 0;

  @include govuk-media-query($from: tablet) {
    display: none;
  }
}

.miller-columns__column-list {
  margin: 0;
  padding: 0;
}

.miller-columns__item {
  position: relative;
  margin-bottom: 1px;
  padding: 2px 9px;
  list-style: none;
  color: $govuk-text-colour;
  cursor: pointer;
  @include govuk-font($size: 16);

  &:hover {
    color: govuk-colour("black");
    background-color: $govuk-hover-colour;
  }

  &:focus {
    @include govuk-focused-text;
  }

  .govuk-checkboxes__item {
    float: none;
  }

  .govuk-checkboxes__label {
    @include govuk-font($size: 16);
    padding: 12px 15px 10px 1px;
  }

  // Remove box-shadow set in govuk-frontend for govuk-checkboxes__input
  // as we rely on the parent element miller-columns__item to show the target area on hover
  .govuk-checkboxes__item:hover .govuk-checkboxes__input:focus + .govuk-checkboxes__label::before,
  .govuk-checkboxes__item:hover .govuk-checkboxes__input:not(:disabled) + .govuk-checkboxes__label::before {
    box-shadow: none;
  }
}

.miller-columns__item--parent:after {
  content: "\203A" / "";
  position: absolute;
  top: 50%;
  right: 5px;
  margin-top: -17px;
  float: right;
  font-size: 24px;
}

.miller-columns__item--selected,
.miller-columns__item--selected:hover {
  color: $mc-selected-item-colour;
  background-color: $mc-selected-item-background;

  .govuk-checkboxes__label {
    color: $mc-selected-item-colour;
  }
}

.miller-columns__item--selected:focus {
  @include govuk-focused-text;

  .govuk-checkboxes__label {
    color: $govuk-text-colour;
  }
}

.miller-columns__item--active,
.miller-columns__item--active:hover {
  color: $mc-active-item-colour;
  background-color: $mc-active-item-background;
  box-shadow: none;

  .govuk-checkboxes__label {
    color: $mc-active-item-colour;
  }
}

.miller-columns__item--active:focus {
  @include govuk-focused-text;

  .govuk-checkboxes__label {
    color: $govuk-text-colour;
  }
}

.miller-columns {
  .govuk-list {
    .govuk-list {
      margin-left: govuk-spacing(6);
    }
  }

  .govuk-back-link {
    margin-bottom: govuk-spacing(4);
    padding-top: 0;
    padding-right: 0;
    padding-bottom: 0;
    border: 0;
    background: transparent;
    text-decoration: underline;

    @include govuk-media-query($from: tablet) {
      display: none;
    }
  }
}