@import "mixins/prefixed-transform";
@import "mixins/grid-helper";

$icon-size: 20px;
$chevron-indent-spacing: 7px;
$black-bar-height: 50px;
$search-width-or-height: $black-bar-height;
$pseudo-underline-height: 3px;
$button-pipe-colour: darken(govuk-colour("mid-grey"), 20%);

@mixin chevron($colour, $update: false) {
  @if $update == true {
    border-bottom-color: $colour;
    border-right-color: $colour;
  } @else {
    @include prefixed-transform($rotate: 45deg, $translateY: -35%);
    border-bottom: 2px solid $colour;
    border-right: 2px solid $colour;
    content: "";
    display: inline-block;
    height: 8px;
    margin: 0 10px 0 2px;
    vertical-align: middle;
    width: 8px;
  }
}

@mixin make-selectable-area-bigger {
  background: none;
  bottom: 0;
  content: "";
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

@mixin pseudo-underline($left: govuk-spacing(4), $right: govuk-spacing(4)) {
  background: none;
  bottom: 0;
  content: "";
  height: $pseudo-underline-height;
  left: $left;
  position: absolute;
  right: $right;
  top: auto;
}

@mixin focus-and-focus-visible {
  &:focus {
    @content;
  }

  &:focus-visible {
    @content;
  }
}

@mixin focus-not-focus-visible {
  & {
    @content;
  }

  &:focus:not(:focus-visible) {
    @content;
  }
}

// Header layout - black bar and logo.
.gem-c-layout-super-navigation-header {
  background: govuk-colour("black");
  border-top: 1px solid govuk-colour("black");
  margin-top: -1px;
  position: relative;

  .lte-ie8 & {
    height: $black-bar-height;
  }

  [hidden] {
    display: none;
  }
}

.gem-c-layout-super-navigation-header__container {
  position: relative;

  @include govuk-media-query($from: "desktop") {
    position: static;
  }
}

.gem-c-layout-super-navigation-header__header-logo {
  height: govuk-spacing(6);
  padding-bottom: govuk-spacing(2);
  padding-top: govuk-spacing(2);

  @include govuk-media-query($from: "desktop") {
    display: block;
    float: left;
  }
}

.gem-c-layout-super-navigation-header__content {
  @include govuk-media-query($from: "desktop") {
    display: block;
    float: right;
  }
}

.gem-c-layout-super-navigation-header__navigation-toggle-wrapper {
  position: relative;
}

// Top level navigation and search.
.gem-c-layout-super-navigation-header__navigation-items,
.gem-c-layout-super-navigation-header__search-items {
  background: govuk-colour("light-grey");
  display: block;
  list-style: none;
  margin: 0 (0 - govuk-spacing(3));
  padding: 0;

  @include govuk-media-query($from: "tablet") {
    margin: 0 (0 - govuk-spacing(6));
  }

  @include govuk-media-query($from: "desktop") {
    background: none;
    float: left;
    padding: 0;
    margin: 0;
  }
}

.gem-c-layout-super-navigation-header__navigation-items {
  @include govuk-media-query($from: "desktop") {
    display: inline-block;
  }
}

.gem-c-layout-super-navigation-header__navigation-item,
.gem-c-layout-super-navigation-header__search-item {
  display: block;
  margin: 0;
  padding: govuk-spacing(2) govuk-spacing(3);
  position: relative;

  @include govuk-media-query($from: "tablet") {
    margin: 0 govuk-spacing(6);
    padding: govuk-spacing(2) 0;
  }

  @include govuk-media-query($from: "desktop") {
    background: govuk-colour("black");
    display: block;
    float: left;
    margin: 0;
    padding: 0;
    position: static;
  }
}

.gem-c-layout-super-navigation-header__navigation-item {
  border-bottom: 1px solid $govuk-border-colour;

  .js-module-initialised & {
    &:last-child {
      border-bottom: none;
    }
  }

  @include govuk-media-query($from: "desktop") {
    border-bottom: 0;
    padding: 0;

    &:first-of-type {
      margin-right: -1px;

      .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
        border-left: 1px solid $button-pipe-colour;
        border-right: 1px solid $button-pipe-colour;
      }
    }
  }
}

// Top level navigation links and search link.
.gem-c-layout-super-navigation-header__navigation-item-link,
.gem-c-layout-super-navigation-header__search-item-link,
.gem-c-layout-super-navigation-header__navigation-second-toggle-button {
  @include govuk-link-common;
  @include govuk-link-style-no-visited-state;

  display: inline-block;
  font-size: 19px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(19px);
  }
  font-weight: bold;
  margin: govuk-spacing(3) 0;

  @include govuk-media-query($from: "desktop") {
    display: block;
    margin: 0;
  }

  &:hover {
    @include govuk-link-hover-decoration;
  }

  &,
  &:link,
  &:visited {
    @include focus-and-focus-visible {
      @include govuk-focused-text;
    }

    // Undoes the :focus styles *only* for browsers that support :focus-visible.
    // See https://www.tpgi.com/focus-visible-and-backwards-compatibility/
    &:focus:not(:focus-visible) {
      background: none;
      box-shadow: none;
      color: $govuk-link-colour;

      &:hover {
        @include govuk-link-decoration;
        @include govuk-link-hover-decoration;
        color: $govuk-link-hover-colour;
      }
    }

    &:after {
      @include make-selectable-area-bigger;
    }

    @include govuk-media-query($from: "desktop") {
      float: left;
      font-size: 16px;

      // stylelint-disable max-nesting-depth
      @if $govuk-typography-use-rem {
        font-size: govuk-px-to-rem(16px);
      }
      // stylelint-enable max-nesting-depth

      height: govuk-spacing(4);
      padding: govuk-spacing(3);
      position: relative;

      &:before {
        @include chevron(govuk-colour("white"), true);
      }

      &:hover {
        color: govuk-colour("mid-grey");

        &:after {
          background: govuk-colour("mid-grey");
        }
      }

      // stylelint-disable max-nesting-depth
      @include focus-and-focus-visible {
        &,
        &:hover {
          box-shadow: none;
          color: $govuk-focus-text-colour;

          &:after {
            background: $govuk-focus-text-colour;
          }
        }
      }

      @include focus-not-focus-visible {
        &,
        &:hover {
          text-decoration: none;
        }

        & {
          color: govuk-colour("white");
        }

        &:hover {
          color: govuk-colour("mid-grey");

          &:after {
            background: govuk-colour("mid-grey");
          }
        }

        &:after {
          background: none;
        }
      }
      // stylelint-enable max-nesting-depth

      &:after {
        @include pseudo-underline($left: govuk-spacing(5), $right: govuk-spacing(6));
      }
    }
  }

  &:after {
    @include make-selectable-area-bigger;
  }
}

.gem-c-layout-super-navigation-header__navigation-item-link {
  .js-module-initialised & {
    margin-left: govuk-spacing(4);
    @include govuk-link-style-no-underline;
  }
}

.gem-c-layout-super-navigation-header__navigation-second-toggle-button {
  background: none;
  border: 0;
  color: $govuk-link-colour;
  cursor: pointer;
  padding: 0;

  @include focus-not-focus-visible {
    .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
      &:before {
        @include chevron($govuk-link-colour);
      }
    }
  }

  @include focus-not-focus-visible {
    &:hover {
      .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
        &:before {
          @include chevron($govuk-link-hover-colour, true);
        }
      }
    }
  }

  &:focus {
    .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
      &:before {
        @include chevron($govuk-focus-text-colour, true);
      }
    }
  }

  @include govuk-media-query($from: "desktop") {
    &:after {
      @include pseudo-underline($left: govuk-spacing(5), $right: govuk-spacing(6));
    }

    @include focus-not-focus-visible {
      color: govuk-colour("white");
      float: left;
      font-size: 16px;
      @if $govuk-typography-use-rem {
        font-size: govuk-px-to-rem(16px);
      }
      height: $black-bar-height;
      position: relative;
      text-decoration: none;

      .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
        border-color: $button-pipe-colour;

        &:before {
          @include chevron(govuk-colour("white"), true);
        }
      }
    }
    @include focus-not-focus-visible {
      &:hover {
        color: govuk-colour("mid-grey");
        text-decoration: none;

        &:after {
          background: govuk-colour("mid-grey");
        }

        .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
          border-color: $button-pipe-colour;

          &:before {
            @include chevron($button-pipe-colour, true);
          }
        }
      }
    }

    @include focus-and-focus-visible {
      color: $govuk-focus-text-colour;

      &:after {
        background: $govuk-focus-text-colour;
      }

      .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
        border-color: $govuk-focus-colour;

        &:before {
          @include chevron($govuk-focus-text-colour, true);
        }
      }
    }
  }

  &.gem-c-layout-super-navigation-header__open-button {
    @include focus-not-focus-visible {
      .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
        &:before {
          @include prefixed-transform($rotate: 225deg, $translateY: 1px);
        }
      }
    }

    @include govuk-media-query($from: "desktop") {
      @include focus-not-focus-visible {
        background: govuk-colour("light-grey");
        color: $govuk-link-colour;

        // stylelint-disable max-nesting-depth
        .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
          border-color: govuk-colour("light-grey");

          &:before {
            @include chevron($govuk-link-colour, true);
          }
        }

        &:after {
          background-color: $govuk-link-colour;
        }
      }

      @include focus-and-focus-visible {
        background-color: $govuk-focus-colour;
        color: $govuk-focus-text-colour;

        .gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
          border-color: $govuk-focus-colour;

          &:before {
            @include chevron($govuk-focus-text-colour, true);
          }
        }

        &:after {
          background: $govuk-focus-text-colour;
        }
      }
    }
  }
  // stylelint-enable max-nesting-depth

  .js-module-initialised & {
    @include govuk-link-style-no-underline;
  }
}

.gem-c-layout-super-navigation-header__navigation-second-toggle-button-inner {
  @include govuk-media-query($from: "desktop") {
    display: inline-block;
    padding: govuk-spacing(2) govuk-spacing(6) govuk-spacing(2) govuk-spacing(5);
  }
}

// Search link and dropdown.
.gem-c-layout-super-navigation-header__search-item-link {
  &:link,
  &:visited {
    @include govuk-media-query($from: "desktop") {
      background: $govuk-brand-colour;
      border-bottom: 1px solid govuk-colour("dark-blue");

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

        &:before {
          left: 0;
          right: 0;
        }
      }

      &:focus {
        background: $govuk-focus-colour;

        &:before {
          content: none;
        }
      }

      &:after {
        left: 0;
        right: 0;
      }

      @include focus-not-focus-visible {
        background: $govuk-link-colour;

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

      @include focus-and-focus-visible {
        &:hover {
          background: $govuk-focus-colour;
        }

        &:after,
        &:hover:after {
          background: $govuk-focus-colour;
        }
      }
    }
  }
}

.gem-c-layout-super-navigation-header__search-item-link-text {
  @include govuk-media-query($from: "desktop") {
    @include govuk-visually-hidden;
  }
}

.gem-c-layout-super-navigation-header__search-item-link-icon,
.gem-c-layout-super-navigation-header__search-toggle-button-link-icon {
  height: $icon-size;
  pointer-events: none;
  width: $icon-size;
}

.gem-c-layout-super-navigation-header__search-item-link-icon {
  @include govuk-media-query($until: "desktop") {
    @include govuk-visually-hidden;
  }
}

// Search and popular content dropdown.
.gem-c-layout-super-navigation-header__search-and-popular {
  display: none;
  padding-bottom: govuk-spacing(4);
  padding-top: govuk-spacing(4);

  .js-module-initialised & {
    display: block;
  }
}

// Styles for top level navigation toggle button.
.gem-c-layout-super-navigation-header__navigation-top-toggle-button {
  @include govuk-link-common;
  @include govuk-link-style-no-visited-state;
  @include govuk-link-style-no-underline;

  font-size: 16px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(16px);
  }
  font-weight: 700;
  background: govuk-colour("black");
  border: 0;
  box-sizing: border-box;
  color: govuk-colour("white");
  cursor: pointer;
  height: $black-bar-height;
  padding: 0;
  margin: 0;
  position: absolute;
  right: (($search-width-or-height - govuk-spacing(3)) - 1px); // width of the search button (50px) - 15px - 1px to create an overlap between buttons and stop the border appearing to hang off the buttons when they're focused/open
  top: 0;
  z-index: 10;

  @include focus-and-focus-visible {
    @include govuk-focused-text;
    box-shadow: none;

    .gem-c-layout-super-navigation-header__navigation-top-toggle-button-inner {
      border-color: $govuk-focus-colour;
      color: govuk-colour("black");

      @include govuk-media-query($from: 360px) {
        &:before {
          @include chevron(govuk-colour("black"), true);
        }
      }
    }
  }

  // Undoes the :focus styles *only* for browsers that support :focus-visible.
  // See https://www.tpgi.com/focus-visible-and-backwards-compatibility/
  @include focus-not-focus-visible {
    background: none;
    box-shadow: none;

    .gem-c-layout-super-navigation-header__navigation-top-toggle-button-inner {
      border-color: $button-pipe-colour;
      color: govuk-colour("white");

      @include govuk-media-query($from: 360px) {
        &:before {
          @include chevron(govuk-colour("white"), true);
        }
      }
    }
  }

  &:after {
    @include pseudo-underline;
  }

  // Open button modifier
  &.gem-c-layout-super-navigation-header__open-button {
    // stylelint-disable max-nesting-depth
    @include focus-and-focus-visible {
      @include govuk-focused-text;
      box-shadow: none;

      &:after {
        background-color: $govuk-focus-colour;
      }

      .gem-c-layout-super-navigation-header__navigation-top-toggle-button-inner {
        color: govuk-colour("black");
        border-color: $govuk-focus-colour;

        @include govuk-media-query($from: 360px) {
          &:before {
            @include chevron(govuk-colour("black"), true);
            @include prefixed-transform($rotate: 225deg, $translateY: 1px);
          }
        }
      }
    }

    @include focus-not-focus-visible {
      background: govuk-colour("light-grey");

      &:after {
        background-color: $govuk-link-colour;
      }

      .gem-c-layout-super-navigation-header__navigation-top-toggle-button-inner {
        color: $govuk-link-colour;
        border-color: govuk-colour("light-grey");

        @include govuk-media-query($from: 360px) {
          &:before {
            @include chevron($govuk-link-colour);
            @include prefixed-transform($rotate: 225deg, $translateY: 1px);
          }
        }
      }
    }
    // stylelint-enable max-nesting-depth
  }
}

.gem-c-layout-super-navigation-header__navigation-top-toggle-button-inner {
  display: inline-block;
  border-left: 1px solid govuk-colour("white");
  border-right: 1px solid govuk-colour("white");
  margin: 0;
  padding: govuk-spacing(2) govuk-spacing(4);

  @include govuk-media-query($from: 360px) {
    &:before {
      @include chevron(govuk-colour("white"));
    }
  }
}

// Styles for search toggle button.
.gem-c-layout-super-navigation-header__search-toggle-button {
  @include govuk-font($size: 19, $weight: "bold", $line-height: 20px);
  background: govuk-colour("black");
  border: 0;
  color: govuk-colour("white");
  cursor: pointer;
  height: $search-width-or-height;
  padding: govuk-spacing(3);
  position: absolute;
  right: (0 - govuk-spacing(3));
  top: 0;
  width: $search-width-or-height;

  @include focus-and-focus-visible {
    @include govuk-focused-text;
    border-color: $govuk-focus-colour;
    box-shadow: none;
    z-index: 11;
  }

  &:focus:not(:focus-visible) {
    background: none;
    border-color: govuk-colour("white");
    box-shadow: none;
    color: govuk-colour("white");
  }

  @include govuk-media-query($from: "desktop") {
    right: 0;

    @include focus-not-focus-visible {
      background: $govuk-brand-colour;
      border-bottom: 1px solid govuk-colour("dark-blue");
      border-left: none;
      position: relative;
    }

    &:hover {
      background: govuk-colour("black");
      border-bottom: $pseudo-underline-height solid govuk-colour("mid-grey");
      color: govuk-colour("mid-grey");
    }

    @include focus-and-focus-visible {
      @include govuk-focused-text;
      border-bottom-color: $govuk-focus-colour;
      box-shadow: none;
    }
  }

  // Open button modifier
  &.gem-c-layout-super-navigation-header__open-button {
    @include focus-and-focus-visible {
      @include govuk-focused-text;
      border-color: $govuk-focus-colour;
      box-shadow: none;
      color: $govuk-focus-colour;

      @include govuk-media-query($from: 360px) {
        &:before {
          @include chevron($govuk-focus-colour, true);
        }
      }
    }

    @include focus-not-focus-visible {
      background: govuk-colour("light-grey");
      border-bottom-color: govuk-colour("light-grey");
      color: govuk-colour("light-grey");
    }
  }
}

.gem-c-layout-super-navigation-header__navigation-top-toggle-close-icon {
  color: $govuk-text-colour;
  display: none;
  font-size: 36px;
  font-weight: normal;
  left: 0;
  line-height: 22px;
  padding: govuk-spacing(3) 0;
  pointer-events: none;
  position: absolute;
  right: 0;
  text-align: center;
  top: 0;

  .gem-c-layout-super-navigation-header__open-button & {
    display: block;
  }
}

// Dropdown menu.
.gem-c-layout-super-navigation-header__navigation-dropdown-menu {
  background: govuk-colour("light-grey");

  @include govuk-media-query($from: "desktop") {
    left: 0;
    position: absolute;
    right: 0;
  }
}

// Dropdown menu description.
.gem-c-layout-super-navigation-header__menu-description {
  display: none;

  @include govuk-media-query($from: "desktop") {
    display: block;
    padding: govuk-spacing(7) 0 govuk-spacing(7) 0;
  }
}

// Dropdown menu items.
.gem-c-layout-super-navigation-header__dropdown-list-item {
  box-sizing: border-box;
  padding: 0 0 govuk-spacing(4) 0;
  position: relative;
}

// Navigation menu items.
.gem-c-layout-super-navigation-header__navigation-second-items {
  list-style: none;
  margin: 0;
  padding: govuk-spacing(6) govuk-spacing(4);

  & > li {
    margin: 0;
  }

  @include govuk-media-query($from: "desktop") {
    margin: 0 (0 - govuk-spacing(3));
    padding: govuk-spacing(7) 0 govuk-spacing(8) 0;

    & > li {
      margin: 0 govuk-spacing(3);
    }
  }
}

.gem-c-layout-super-navigation-header__navigation-second-items--topics {
  @include govuk-media-query($from: "desktop") {
    @include columns($items: 16, $columns: 2, $selector: "li", $flow: column);
  }
}

.gem-c-layout-super-navigation-header__navigation-second-items--government-activity {
  @include govuk-media-query($from: "desktop") {
    @include columns($items: 6, $columns: 2, $selector: "li", $flow: column);
    padding-bottom: 0;

    & > li {
      box-sizing: border-box;
      padding-bottom: govuk-spacing(4);
    }
  }
}

.gem-c-layout-super-navigation-header__navigation-second-item-link {
  font-size: 16px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(16px);
  }

  &:after {
    @include make-selectable-area-bigger;
  }

  @include govuk-media-query($from: "desktop") {
    font-weight: bold;
    padding: 0;

    &:after {
      content: none;
    }
  }
}

.gem-c-layout-super-navigation-header__navigation-second-item-link--with-description {
  font-size: 16px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(16px);
  }
  font-weight: bold;
}

// Dropdown menu footer links.
.gem-c-layout-super-navigation-header__navigation-second-footer-break {
  @include govuk-media-query($until: "desktop") {
    display: none;
  }
}

.gem-c-layout-super-navigation-header__navigation-second-footer-list {
  list-style: none;
  padding: 0 0 govuk-spacing(8) govuk-spacing(4);

  @include govuk-media-query($from: "desktop") {
    @include columns($items: 2, $columns: 2, $selector: "li");
    margin: 0 (0 - govuk-spacing(3));
    padding: govuk-spacing(6) 0 govuk-spacing(7) 0;
  }
}

.gem-c-layout-super-navigation-header__navigation-second-footer-item {
  padding: govuk-spacing(2) 0;
  position: relative;

  @include govuk-media-query($from: "desktop") {
    padding: 0 govuk-spacing(3);
  }
}

.gem-c-layout-super-navigation-header__navigation-second-footer-link {
  display: inline-block;
  font-size: 16px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(16px);
  }
  margin: govuk-spacing(1) 0;

  &:after {
    @include make-selectable-area-bigger;
  }

  @include govuk-media-query($from: "desktop") {
    display: inline;
    padding: 0;

    &:after {
      content: none;
    }
  }
}

.gem-c-layout-super-navigation-header__navigation-second-item-description {
  @include govuk-typography-common;
  font-size: 16px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(16px);
  }
  font-weight: normal;
  margin: govuk-spacing(1) 0 0 0;
}

// Search dropdown.
.gem-c-layout-super-navigation-header__search-items {
  background: govuk-colour("light-grey");
  margin: 0 (0 - govuk-spacing(3));

  @include govuk-media-query($from: "tablet") {
    margin: 0 (0 - govuk-spacing(6));
  }

  @include govuk-media-query($from: "desktop") {
    margin: 0;

    .js-module-initialised & {
      left: 0;
      position: absolute;
      right: 0;
    }
  }
}

.gem-c-layout-super-navigation-header__search-form {
  padding: govuk-spacing(3) 0 govuk-spacing(6) 0;
}

// Popular links.
.gem-c-layout-super-navigation-header__popular-item {
  position: relative;
  padding: govuk-spacing(1) 0;
}

.gem-c-layout-super-navigation-header__popular-link {
  display: inline-block;
  font-size: 16px;
  @if $govuk-typography-use-rem {
    font-size: govuk-px-to-rem(16px);
  }
  padding: 0;

  &:after {
    @include make-selectable-area-bigger;
  }

  @include govuk-media-query($from: "desktop") {
    &:after {
      content: none;
    }
  }
}

// To be used with .govuk-width-container - we only need the margins from
// desktop onwards.
.gem-c-layout-super-navigation-header__width-container {
  @include govuk-media-query($until: "desktop") {
    margin: 0;
  }
}