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 {
  padding: 0.8rem 0.8rem 0;

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

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

  // // Search overlay
  // &__overlay {
  //   display: none;
  //
  //   // [mobile -]: Only show overlay on mobile
  //   @include break-to-device(mobile) {
  //     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;                                                    // TODO: correct?
  //     background: #EEEEEE;
  //     opacity: 0;
  //     overflow: hidden;
  //     z-index: 0;
  //
  //     // Expanded overlay
  //     .md-toggle--search:checked ~ .md-header & {
  //       transform: scale(40);
  //       transition: transform 0.4s,
  //                   opacity   0.1s;
  //       opacity: 1;
  //       z-index: 1;
  //     }
  //   }
  // }

  // Search form
  &__form {
    position: relative;
    border-radius: px2rem(2px);
    text-align: right;

    // [mobile -]: Add drop-shadow on mobile
    @include break-to-device(mobile) {
      @include z-depth(2);
    }

    // [tablet +]: Header-embedded search
    @include break-from-device(tablet) {
      width: 23.0rem;
      transition: width 0.25s cubic-bezier(0.1, 0.7, 0.1, 1.0);

      // Active search field
      .md-js__search--locked & {
        width: 66.8rem;
      }
    }
  }

  // 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;

    // [mobile -]: Use back arrow as search icon
    @include break-to-device(mobile) {
      top: 1.2rem;

      // Hack: @extend doesn't work in media queries, so override manually
      &::before {
        content: "arrow_back";
      }
    }
  }

  // Search field
  &__input {
    padding: 0 1.6rem 0 6.4rem;
    border-radius: px2rem(2px);
    text-overflow: ellipsis;

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

    // [mobile -]: Full-screen search bar
    @include break-to-device(mobile) {
      width: 100%;
      height: 4.8rem;
      font-size: 1.8rem;
    }

    // [tablet +]: Header-embedded search
    @include break-from-device(tablet) {
      width: 100%;
      height: 4.0rem;
      padding-left: 4.8rem;
      transition: background-color 0.25s,
                  color            0.25s;
      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;
      }

      // Active search field
      .md-js__search--locked & {
        border-radius: px2rem(3px) px2rem(3px) 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;
        }
      }
    }
  }
}