/**
 * Header Component
 *
 * Based on the existing GOV.UK header in GOV.UK Template, with an 'inline'
 * product name and hopefully improved mobile behaviour
 *
 * Notes:
 *
 * - Make sure you include header.js in your application. This will update
 *   the aria-expanded and aria-hidden attributes on the toggle and the nav
 *   respectively so that screen readers know what's happening.
 * - Link the current page to the same place as your skip link (e.g. #main) –
 *   this means that it is included by screen readers but is referred to as a
 *   'same page' link, and clicking it does not reload the page.
 *
 * Example Usage:
 *
 * <header class="header">
 *   <div class="header__container">
 *     <div class="header__brand">
 *       <a href="/">
 *         <span class="header__title">My Product Page</span>
 *       </a>
 *     </div>
 *
 *     <div data-module="navigation">
 *       <button type="button" class="header__navigation-toggle js-nav-toggle" aria-controls="navigation" aria-label="Show or hide top level navigation">
 *         Menu
 *       </button>
 *
 *       <nav id="navigation" class="header__navigation" aria-label="Top Level Navigation" aria-hidden="true">
 *         <ul>
 *           <li class="active"><a href="#main">Active Page</a></li>
 *           <li><a href="/other.html">Other Page</a></li>
 *         </ul>
 *       </nav>
 *     </div>
 *   </div>
 * </header>
 */

$active-nav-color: #1d8feb;

.header {
  @extend %contain-floats;

  @include screen {
    background: $black;
    color: $white;
    border-bottom: 10px solid $white;
  }
}

.header__container {
  @extend %site-width-container;
  @extend %contain-floats;
  zoom: 1;

  padding: 9px 0 6px;

  @include screen {
    border-bottom: 10px solid $mainstream-brand;
    margin-bottom: -10px;
  }
}

.header.header--full-width {
  margin-bottom: 0;

  @include screen {
    border-bottom: 10px solid $mainstream-brand;
  }

  .header__container {
    border-bottom: none;
    width: auto;
    max-width: none;
    margin: 0 $gutter-half;

    @include media(tablet) {
      margin: 0 $gutter;
    }
  }
}

.header--without-border {
  border-bottom: none;
  margin-bottom: 0;

  .header__container {
    border-bottom: none;
    margin-bottom: 0;
  }
}

.header__brand {
  font-size: 30px;
  
  // Give brand focus outline on mobile
  &:after {
    content: ".";
    height: 0;
    clear: both;
    visibility: hidden;
  }

  a:link, a:visited {
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline;
  }

  .govuk-logo {
    float: left;
  }

  @include screen {
    a:link, a:visited {
      color: $white;
    }

    a:focus {
      background-color: inherit;
    }

    @include media(tablet) {
      float: left;

      .govuk-logo {
        float: none;
      }

      a:hover {
        text-decoration: none;
        border-bottom: 1px solid $white;
      }
    }
  }

  @include print {
    a:link, a:visited {
      color: $black;
    }
  }
}

.header__title {
  @include core-24;
  display: block;
  float: left;
  clear: left;

  @include media(tablet) {
    display: inherit;
    float: none;
    clear: none;
  }

  .phase-banner {
    margin-left: 5px;
  }
}

.header__navigation {
  @include screen {

    // We want the same font size on mobile as tablet, so we can't use bold-16.
    @include _core-font-generator(
      $font-size: 16px,
      $font-size-640: 16px,
      $font-size-print: 12pt,
      $line-height: (20 / 16),
      $line-height-640: (20 / 16),
      $font-weight: 700
    );

    clear: both;

    padding-top: 10px;

    a:link, a:visited {
      color: $white;
      text-decoration: none;
      padding: 8px 0;
      display: inline-block;
    }

    .active a:link, .active a:visited {
      color: $active-nav-color;
    }

    a:focus, .active a:focus {
      color: $black;
    }

    a:hover, a:active {
      text-decoration: underline;
    }

    ul {
      border-top: 1px solid $grey-1;
      margin: 0;
      padding: 8px 0 0;
    }

    li {
      list-style: none;
      margin: 2px 0;
    }

    @include media(tablet) {
      display: block;
      clear: none;
      padding-top: 2px;
      border-top: none;
      float: right;

      a:link, a:visited {
        padding: 0;
      }

      ul {
        border-top: none;
        padding: 0;
      }

      li {
        float: left;
        margin: 12px 0 0 $gutter-half;
      }
    }
  }

  @include print {
    display: none;
  }
}

.header__navigation-toggle {
  display: none;
}

.js {
  .header__navigation {
    display: none;
    
    @include media(tablet) {
      display: block;
    }
  }

  .header__navigation-toggle {
    display: block;
    float: right;
    color: $white;
    background: transparent;
    border: 1px solid $grey-1;
    border-radius: 3px;
    padding: 2px 6px 1px;
    font-size: 80%;
    font-weight: bold;

    input {
      display: none;
    }

    @include media(tablet) {
      display: none;
    }

    &:after {
      display: inline-block;
      font-size: 8px;
      padding-left: 5px;
      vertical-align: middle;
      content: " \25BC";
    }
  }

  &.nav-open .header__navigation-toggle:after {
    content: "\25B2";
  }

  &.nav-open .header__navigation {
    display: block;
  }
}