<!-- Gallery -->
<main id="js-gallery" role="main" class="gallery">

  <section class="gallery__body">

    <!-- Poster -->
    <div id="js-poster" class="main__gallery-poster poster">
      <div class="poster__content">

        <header class="poster__header">
          <h1 class="poster__header-title">Konstruktive Grafik</h1>
          <h2 class="poster__header-subtitle">Kunstgewerbe museum <br />Zürich</h2>
          <ul class="poster__header-meta">
            <li>Offen: Montag 14-18</li>
            <li>Dienstag bis Freitag 10-12, 14-18, 20-22</li>
            <li>Samstag / Sonntag 10-12, 14-17</li>
            <li class="last">8. März bis 6. April 1958</li>
          </ul>
        </header>

        <ul class="poster__body">
          <li>Arbeiten</li>
          <li>von</li>
          <li>Richard P. Lohse</li>
          <li>Hans Neuburg</li>
          <li>Carlos L. Vivarelli</li>
        </ul>

        <footer class="poster__footer">
          <p>Credit copy that is too small to read unfortunately.</p>
        </footer>

        <div class="poster__rules">
          <div class="r-1">
            <svg width="500" height="500" version="1.1" xmlns="http://www.w3.org/2000/svg">
              <rect width="500" height="500" stroke="black" fill="transparent" stroke-width="55" />
            </svg>
          </div>
          <div class="r-2">
            <svg width="500" height="500" version="1.1" xmlns="http://www.w3.org/2000/svg">
              <rect width="500" height="500" stroke="black" fill="transparent" stroke-width="55" />
            </svg>
          </div>
          <div class="r-3">
            <svg width="500" height="500" version="1.1" xmlns="http://www.w3.org/2000/svg">
              <rect width="500" height="500" stroke="white" fill="transparent" stroke-width="55" />
            </svg>
          </div>
          <div class="r-4">
            <svg width="500" height="500" version="1.1" xmlns="http://www.w3.org/2000/svg">
              <rect width="500" height="500" stroke="white" fill="transparent" stroke-width="55" />
            </svg>
          </div>
        </div>

      </div>
    </div>
    <!-- Poster -->

  </section>
  <!-- .gallery__body -->

</main>
<!-- Gallery -->

/**
 * Mixins
 */
@mixin pos($position, $top: auto, $right: auto, $bottom: auto, $left: auto) {
  position: $position;
  top: $top;
  right: $right;
  bottom: $bottom;
  left: $left;
}

@mixin center($width: null, $height: null) {
  position: absolute;
  top: 50%;
  left: 50%;
  @if not $width and not $height {
    transform: translate(-50%, -50%);
  } @else if $width and $height {
    width: $width;
    height: $height;
    margin: -($width / 2) #{0 0} - ($height / 2);
  } @else if not $height {
    margin-left: -($width / 2);
    transform: translateY(-50%);
    width: $width;
  } @else {
    margin-top: -($height / 2);
    transform: translateX(-50%);
    height: $height;
  }
}

/**
 * Variables
 */
$primary-color: #e3c205;
$timing: cubic-bezier(0.455, 0.03, 0.515, 0.955);
$duration: 1s;

/**
 * Animations
 */
@keyframes dash {
  0% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: 3000;
  }
}

/**
 * Base
 */
*,
*:after,
*:before {
  box-sizing: border-box;
}

body {
  font-family: "Helvetica Neue", "Helvetica", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: bold;
}

/**
 * Gallery
 */
.gallery {
  @include pos(absolute, 0, 0, 0, 0);
  z-index: 1;
  width: 100%;
  height: 100%;
  overflow: hidden;
  opacity: 1;
  transition: $duration opacity $timing;
  background: $primary-color;
  background: radial-gradient(
    ellipse at center,
    lighten($primary-color, 5%) 0%,
    $primary-color 100%
  );

  &.fadeOut {
    opacity: 0;
  }
}

.gallery__body {
  @include center();
  transform-origin: center center;
}

/**
 * Poster
 */
.poster {
  @include center();
  transform-origin: center center;
  display: inline-block;
  vertical-align: middle;

  &:before,
  &:after {
    z-index: -1;
    position: absolute;
    content: "";
    bottom: 15px;
    left: 8px;
    width: 50%;
    top: 80%;
    max-width: 300px;
    background: #777;
    box-shadow: 0 15px 10px rgba(#000, 0.5);
    transform: rotate(-3deg);
  }

  &:after {
    transform: rotate(3deg);
    right: 8px;
    left: auto;
  }
}

.poster__content {
  position: relative;
  width: 500px;
  height: 700px;
  overflow: hidden;
  padding: 0 1em;
  background-color: $primary-color;
  color: black;
  box-shadow: 0 1px 4px 2px rgba(#000, 0.2);
}

.poster__header {
  width: 75%;
  float: left;
  margin-top: 40%;
  overflow: hidden;
}

.poster__header-title {
  margin-bottom: 0.3em;
  font-size: 30px;
}

.poster__header-subtitle {
  width: 35%;
  float: left;
  font-size: 14px;
  line-height: 1;
}

.poster__header-meta {
  position: relative;
  top: 0.2em;
  width: 65%;
  float: right;
  font-size: 6px;
  line-height: 1.5;
  font-weight: bold;

  li:last-child {
    margin-top: 4px;
  }
}

.poster__body {
  position: relative;
  top: 8px;
  width: 25%;
  float: right;
  margin-top: 40%;
  font-size: 14px;
  font-weight: bold;
  line-height: 1;

  li:nth-child(3n) {
    margin-top: 4px;
  }
}

.poster__footer {
  @include pos(absolute, 45%, auto, auto, 73.5%);
  font-size: 3px;
}

.poster__rules {
  @include pos(absolute, 0, 0, 0, 0);
  width: 100%;
  height: 100%;
  overflow: hidden;

  div {
    position: absolute;
  }
}

.smil .poster__rules div rect {
  stroke-dasharray: 1000;
  animation: dash 5s $timing infinite alternate;
}

.r-1 {
  top: -50%;
  left: 27.5%;
  z-index: 2;
}

.r-2 {
  bottom: -22%;
  left: 27.5%;
  z-index: 2;
}

.r-3 {
  top: -26%;
  left: -32%;
  z-index: 1;
}

.r-4 {
  bottom: -46%;
  left: -32%;
  z-index: 3;
}

(function (window, document, undefined) {
  "use strict";

  /**
   * Selectors
   */
  var body = document.body,
    gallery = document.getElementById("js-gallery"),
    galleryWidth = gallery.offsetWidth,
    galleryHeight = gallery.offsetHeight,
    poster = document.getElementById("js-poster"),
    posterWidth = poster.offsetWidth,
    posterHeight = poster.offsetHeight,
    posterPadding = "50";

  /**
   * Prefixed requestAnimationFrame
   */
  var requestAnimationFrame =
    window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (callback) {
      return setTimeout(callback, 1000 / 60);
    };

  /**
   * Methods
   */
  var throttle = function (callback, limit) {
    var wait = false;
    return function () {
      if (!wait) {
        callback.call();
        wait = true;
        setTimeout(function () {
          wait = false;
        }, limit);
      }
    };
  };

  var resizePoster = function () {
    // Define variable
    var scale;

    // Get values for poster dimensions
    scale = Math.min(galleryWidth / posterWidth, galleryHeight / posterHeight);

    // Scale Poster for larger viewports
    poster.style[Modernizr.prefixed("transform")] =
      "translate(-50%, -50%) " + "scale(" + scale + ")";

    // Sync operation with browser
    requestAnimationFrame(resizePoster);
  };

  var onResize = throttle(function () {
    // Set Gallery width
    galleryWidth = gallery.offsetWidth - posterPadding;

    // Set Gallery height
    galleryHeight = gallery.offsetHeight - posterPadding;

    // Sync operation with browser
    requestAnimationFrame(resizePoster);
  }, 100);

  /**
   * Events/APIs/init
   */

  // Set Gallery width
  galleryWidth = gallery.offsetWidth - posterPadding;

  // Set Gallery height
  galleryHeight = gallery.offsetHeight - posterPadding;

  // Sync operation with browser
  requestAnimationFrame(resizePoster);

  // Listen for resize event
  window.addEventListener("resize", onResize, false);
})(window, document);