_header.scss

////
/// Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
///
/// Permission is hereby granted, free of charge, to any person obtaining a
/// copy of this software and associated documentation files (the "Software"),
/// to deal in the Software without restriction, including without limitation
/// the rights to use, copy, modify, merge, publish, distribute, sublicense,
/// and/or sell copies of the Software, and to permit persons to whom the
/// Software is furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
/// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
/// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
/// DEALINGS
////

// ----------------------------------------------------------------------------
// Rules
// ----------------------------------------------------------------------------

// Application header (stays always on top)
.md-header {
  @include z-depth(2);

  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  height: 5.6rem;
  transition: background-color 0.25s;
  background-color: $md-color-primary;
  color: $md-color-white;
  z-index: 2;
  // Hack: putting the header on the GPU avoids unnecessary repaints
  backface-visibility: hidden;

  // Always show shadow, in case JavaScript is not available
  .no-js & {
    @include z-depth(2);
  }

  // [screen +]: Show shadow depending on scroll offset
  @include break-from-device(screen) {
    box-shadow: none;

    // Show and animate shadow
    &[data-md-state="shadow"] {
      @include z-depth(2);
    }
  }

  // Hide for print
  @media print {
    display: none;
  }
}

// Navigation within header
.md-header-nav {
  padding: 0.4rem;

  // Icon buttons
  &__button {
    @extend %md-icon__button;

    position: relative;
    transition: opacity 0.25s;
    z-index: 1;

    // Hovered icon
    &:hover {
      opacity: 0.7;
    }

    // Set correct display on image
    &.md-logo img {
      display: block;
    }

    // Hide search icon, if JavaScript is not available.
    .no-js &.md-icon--search {
      display: none;
    }

    // [tablet landscape +]: Hide the search icon
    @include break-from-device(tablet landscape) {

      // Search icon
      &.md-icon--search {
        display: none;
      }
    }

    // [tablet -]: Hide the home icon or logo
    @include break-to-device(tablet) {

      // Home icon or logo
      &.md-icon--home,
      &.md-logo {
        display: none;
      }
    }

    // [screen +]: Hide the menu icon
    @include break-from-device(screen) {

      // Menu icon
      &.md-icon--menu {
        display: none;
      }
    }
  }

  // Header title - set line height to match icon for correct alignment
  &__title {
    padding: 0 2rem;
    font-size: 1.8rem;
    line-height: 4.8rem;
  }

  // Parent page title
  &__parent {
    color: $md-color-white--light;

    // Ancestor separator
    &::after {
      display: inline;
      color: $md-color-white--lighter;
      content: "/";
    }

    // [mobile portrait -]: Hide on very small screens
    @include break-to-device(mobile portrait) {
      display: none;
    }
  }

  // Repository containing source
  &__source {
    display: none;

    // [tablet landscape +]: Show the reposistory from tablet
    @include break-from-device(tablet landscape) {
      display: block;
      width: 23rem;
      max-width: 23rem;
      padding-right: 1.2rem;
    }
  }
}