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<!--
@license
Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../shadow.html">

<!--
Material design: [Cards](https://www.google.com/design/spec/components/cards.html)

Shared styles that you can apply to an element to renders two shadows on top
of each other,that create the effect of a lifted piece of paper.

Example:

    <custom-style>
      <style is="custom-style" include="paper-material-styles"></style>
    </custom-style>

    <div class="paper-material elevation-1">
      ... content ...
    </div>

@group Paper Elements
@demo demo/index.html
-->

<dom-module id="paper-material-styles">
  <template>
    <style>
      :host, html {
        --paper-material: {
          display: block;
          position: relative;
        };
        --paper-material-elevation-1: {
          @apply --shadow-elevation-2dp;
        };
        --paper-material-elevation-2: {
          @apply --shadow-elevation-4dp;
        };
        --paper-material-elevation-3: {
          @apply --shadow-elevation-6dp;
        };
        --paper-material-elevation-4: {
          @apply --shadow-elevation-8dp;
        };
        --paper-material-elevation-5: {
          @apply --shadow-elevation-16dp;
        };
      }
      :host(.paper-material), .paper-material {
        @apply --paper-material;
      }
      :host(.paper-material[elevation="1"]), .paper-material[elevation="1"] {
        @apply --paper-material-elevation-1;
      }
      :host(.paper-material[elevation="2"]), .paper-material[elevation="2"] {
        @apply --paper-material-elevation-2;
      }
      :host(.paper-material[elevation="3"]), .paper-material[elevation="3"] {
        @apply --paper-material-elevation-3;
      }
      :host(.paper-material[elevation="4"]), .paper-material[elevation="4"] {
        @apply --paper-material-elevation-4;
      }
      :host(.paper-material[elevation="5"]), .paper-material[elevation="5"] {
        @apply --paper-material-elevation-5;
      }
    </style>
  </template>
</dom-module>