mkdocs-material/src/assets/stylesheets/layout/_search.scss

////
/// Copyright (c) 2016 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
// ----------------------------------------------------------------------------

// Search container
.md-search {

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

  // [tablet landscape +]: Header-embedded search
  @include break-from-device(tablet landscape) {
    padding: 0.4rem;
    padding-right: 3.2rem;
  }

  // Search modal overlay
  &__overlay {
    display: none;
    pointer-events: none;

    // [tablet portrait -]: Full-screen search bar
    @include break-to-device(tablet portrait) {
      display: block;
      position: absolute;
      top: 0.4rem;
      left: 0.4rem;
      width: 4.0rem;
      height: 4.0rem;
      transform-origin: center;
      transition:
        transform 0.3s 0.1s,
        opacity   0.2s 0.2s;
      border-radius: 2.0rem;
      background: $md-color-white;
      opacity: 0;
      overflow: hidden;
      z-index: 1;

      // Expanded overlay
      .md-toggle--search:checked ~ .md-header & {
        transition:
          transform 0.4s,
          opacity   0.1s;
        opacity: 1;
      }
    }

    // Set scale factors
    .md-toggle--search:checked ~ .md-header & {

      // [mobile portrait -]: Scale up 45 times
      @include break-to-device(mobile portrait) {
        transform: scale(45);
      }

      // [mobile landscape]: Scale up 60 times
      @include break-at-device(mobile landscape) {
        transform: scale(60);
      }

      // [tablet portrait]: Scale up 75 times
      @include break-at-device(tablet portrait) {
        transform: scale(75);
      }
    }
  }

  // Search modal wrapper
  &__inner {
    width: 100%;

    // [tablet portrait -]: Put search modal off-canvas by default
    @include break-to-device(tablet portrait) {
      position: fixed;
      top: 0;
      left: 100%;
      height: 100%;
      transform: translateX(5%);
      transition:
        left      0s    0.3s,
        transform 0.15s 0.15s cubic-bezier(0.4, 0.0, 0.2, 1.0),
        opacity   0.15s 0.15s;
      opacity: 0;
      z-index: 2;

      // Active search modal
      .md-toggle--search:checked ~ .md-header & {
        left: 0;
        transform: translateX(0);
        transition:
          left      0s    0s,
          transform 0.15s 0.15s cubic-bezier(0.1, 0.7, 0.1, 1.0),
          opacity   0.15s 0.15s;
        opacity: 1;
      }
    }

    // [tablet landscape +]: Make relative for inner layout
    @include break-from-device(tablet landscape) {
      display: table;
      position: relative;
      clear: both;
    }
  }

  // Search form
  &__form {
    position: relative;

    // [tablet landscape +]: Header-embedded search
    @include break-from-device(tablet landscape) {
      width: 23.0rem;

      // Hack: omit jitter when form is resized
      float: right;

      transition: width 0.25s cubic-bezier(0.1, 0.7, 0.1, 1.0);
      border-radius: 0.2rem;
    }

    // Set maximum width
    .md-toggle--search:checked ~ .md-header & {

      // [tablet landscape]: Do not overlay title
      @include break-at-device(tablet landscape) {
        width: 46.8rem;
      }

      // [screen +]: Match content width
      @include break-from-device(screen) {
        width: 66.8rem;
      }
    }
  }

  // Search input
  &__input {
    position: relative;
    padding: 0 1.6rem 0 7.2rem;
    text-overflow: ellipsis;
    z-index: 1;

    // Placeholder and icon color in active state
    + .md-search__icon,
    &::placeholder {
      color: $md-color-black--light;
    }

    // [tablet portrait -]: Full-screen search bar
    @include break-to-device(tablet portrait) {
      width: 100%;
      height: 5.6rem;
      font-size: 1.8rem;
    }

    // [tablet landscape +]: Header-embedded search
    @include break-from-device(tablet landscape) {
      width: 100%;
      height: 4.0rem;
      padding-left: 4.8rem;
      transition:
        background-color 0.25s,
        color            0.25s;
      border-radius: 0.2rem;
      background: $md-color-black--lighter;
      color: $md-color-white;
      font-size: ms(0);

      // Placeholder color
      + .md-search__icon,
      &::placeholder {
        transition: color 0.25s;
        color: $md-color-white;
      }

      // Hovered search field
      &:hover {
        background: $md-color-white--lightest;
      }

      // Set light background on active search field
      .md-toggle--search:checked ~ .md-header & {
        border-radius: 0.2rem 0.2rem 0 0;
        background: $md-color-white;
        color: $md-color-black;
        text-overflow: none;

        // Placeholder and icon color in active state
        + .md-search__icon,
        &::placeholder {
          color: $md-color-black--light;
        }
      }
    }
  }

  // Icon
  &__icon {
    position: absolute;
    top: $md-icon-padding;
    left: $md-icon-padding + $md-icon-margin;
    transition: color 0.25s;
    font-size: $md-icon-size;
    cursor: pointer;
    z-index: 1;

    // Set search icon on pseudo class, so it can be overridden for mobile
    // and tablet when the search is rendered in an overlay
    &::before {
      content: "search";
    }

    // [tablet portrait -]: Full-screen search bar
    @include break-to-device(tablet portrait) {
      top: 1.6rem;
      left: 1.6rem;

      // Show back arrow instead of search icon
      &::before {
        content: "arrow_back";
      }
    }
  }

  // Search output container
  &__output {
    position: absolute;
    width: 100%;
    border-radius: 0 0 0.2rem 0.2rem;
    overflow: hidden;

    // [tablet portrait -]: Full-screen search bar
    @include break-to-device(tablet portrait) {
      top: 5.6rem;
      bottom: 0;
    }

    // [tablet landscape +]: Header-embedded search
    @include break-from-device(tablet landscape) {
      @include z-depth(6);

      top: 4.0rem;
      transition: opacity 0.4s;
      opacity: 0;

      // Show search output in active state
      .md-toggle--search:checked ~ .md-header & {
        opacity: 1;
      }
    }
  }

  // Wrapper for scrolling on overflow
  &__scrollwrap {
    height: 100%;

    // Pure CSS scrolling shadows, taken from
    // http://lea.verou.me/2012/04/background-attachment-local/
    background:
  		linear-gradient(
        to bottom,
        $md-color-white 10%,
        $md-color-white--transparent),
      linear-gradient(
        to bottom,
        $md-color-black--lighter,
        $md-color-black--lightest 35%,
        $md-color-black--transparent 60%);
    background-attachment: local, scroll;
    background-color: $md-color-white;
    background-repeat: no-repeat;
    background-size: 100% 2.0rem, 100% 1.0rem;

    box-shadow: 0 0.1rem 0 $md-color-black--lightest inset;
    overflow-y: auto;

    // [tablet landscape +]: Limit height to viewport
    @include break-from-device(tablet landscape) {
      max-height: 0;

      // Expand in active state
      .md-toggle--search:checked ~ .md-header & {
        max-height: 75vh;
      }

      // Override native scrollbar styles
      &::-webkit-scrollbar {
        width: 0.4rem;
        height: 0.4rem;
      }

      // Style scrollbar thumb
      &::-webkit-scrollbar-thumb {
        background-color: $md-color-black--lighter;

        // Hovered scrollbar thumb
        &:hover {
          background-color: $md-color-accent;
        }
      }
    }
  }
}