<div class="demo-btns">
    <header>
      <h1>Material Design Modals</h1>
    </header>

    <div class="info">
      <div class="buttons">
        <p>
          <a href="" data-modal="#modal" class="modal__trigger">Modal 1</a>
          <a href="" data-modal="#modal2" class="modal__trigger">Modal 2</a>
          <a href="" data-modal="#modal3" class="modal__trigger">Modal 3</a>
        </p>
      </div>
      <p>Click a button to activate a modal.</p>
    </div>
  </div>

  <!-- Modal -->
  <div id="modal" class="modal modal__bg" role="dialog" aria-hidden="true">
    <div class="modal__dialog">
      <div class="modal__content">
        <h1>Modal</h1>
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        <!-- modal close button -->
        <a href="" class="modal__close demo-close">
          <svg class="" viewBox="0 0 24 24"><path d="M19 6.41l-1.41-1.41-5.59 5.59-5.59-5.59-1.41 1.41 5.59 5.59-5.59 5.59 1.41 1.41 5.59-5.59 5.59 5.59 1.41-1.41-5.59-5.59z"/><path d="M0 0h24v24h-24z" fill="none"/></svg>
        </a>
        
      </div>
    </div>
  </div>

  <div id="modal2" class="modal modal--align-top modal__bg" role="dialog" aria-hidden="true">
    <div class="modal__dialog">
      <div class="modal__content">
        <h1>Big Modal</h1>
        <h3>This modal is pretty tall.</h3>
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        <p><img src="http://unsplash.it/600/300" alt="" /></p>
        <p>Mumblecore cred selfies fingerstache. Tousled skateboard plaid lo-fi shabby chic salvia, swag Odd Future Etsy art party Austin cronut. Crucifix whatever Pinterest food truck, pickled viral cray 90's DIY chambray keffiyeh biodiesel Vice blog. Cred meh yr tofu.</p>
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        <!-- modal close button -->
        <a href="" class="modal__close demo-close">
          <svg class="" viewBox="0 0 24 24"><path d="M19 6.41l-1.41-1.41-5.59 5.59-5.59-5.59-1.41 1.41 5.59 5.59-5.59 5.59 1.41 1.41 5.59-5.59 5.59 5.59 1.41-1.41-5.59-5.59z"/><path d="M0 0h24v24h-24z" fill="none"/></svg>
        </a>
      </div>
    </div>
  </div>

  <div id="modal3" class="modal modal__bg" role="dialog" aria-hidden="true">
    <div class="modal__dialog">
      <div class="modal__content">
        <h1>Modal 3</h1>
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        <!-- modal close button -->
        <a href="" class="modal__close demo-close">
          <svg class="" viewBox="0 0 24 24"><path d="M19 6.41l-1.41-1.41-5.59 5.59-5.59-5.59-1.41 1.41 5.59 5.59-5.59 5.59 1.41 1.41 5.59-5.59 5.59 5.59 1.41-1.41-5.59-5.59z"/><path d="M0 0h24v24h-24z" fill="none"/></svg>
        </a>
      </div>
    </div>
  </div>

  <!-- Ettrics -->
  <a href="https://ettrics.com/" class="logo" target="_blank">
   <img class="logo" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/45226/ettrics-logo.svg" alt="" /> 
  </a>

$modal-z = 1000
$modal-bg = #FFEBEE
$modal-width = 600px

$space = 2.4rem
$red = #F44336

$t = .5s

$ease($s = $t)
  transition all $s cubic-bezier(0.23, 1, 0.32, 1)

*
  box-sizing border-box

body
  line-height 1.5
  font-family 'Lato'
  -webkit-font-smoothing antialiased
  overflow-x hidden

h1, h2, h3, p
  font-weight 300
  margin 0 0 ($space) 0

h1, h2, h3
  line-height 1.3

a
  text-decoration none
  color inherit
  font-weight 400

/**
 * Material Modal CSS
 */

.modal
  will-change visibility, opacity
  display flex
  align-items center
  justify-content center
  position fixed
  top 0
  left 0
  right 0
  bottom 0
  overflow-y auto
  overflow-x hidden
  z-index $modal-z
  // hide modal
  visibility hidden
  opacity 0
  $ease()
  transition-delay $modal-delay

  &--active
    // reveal modal
    visibility visible
    opacity 1

  &--align-top
    // align to top of window, useful if modal has a lot of content
    align-items flex-start

  &__bg
    // background color can be added as a backdrop for the modal
    background transparent

  &__dialog
    // controls the width and padding of modal
    max-width $modal-width
    padding ($space / 2)

  &__content
    will-change transform, opacity
    position relative
    padding $space
    background $modal-bg
    background-clip padding-box
    box-shadow 0 12px 15px 0 rgba(black, 0.25)
    opacity 0
    $ease(.25s)

    &--active
      opacity 1

  &__close
    z-index $modal-z+100
    cursor pointer

  &__trigger
    // modal trigger button
    position relative
    display inline-block;
    padding ($space / 2) $space
    color: rgba(black, 0.7)
    line-height 1
    cursor pointer
    background $modal-bg
    box-shadow 0 2px 5px 0 rgba(black, 0.26)
    -webkit-tap-highlight-color: rgba(0,0,0,0);   user-select none
    $ease()

    &--active
        z-index 10

    &:hover
        background mix(black, $modal-bg, 10)


#modal__temp
  // this is the div that expands when the button is clicked
  will-change transform, opacity
  position absolute
  top 0
  left 0
  right 0
  bottom 0
  background $modal-bg
  transform none
  opacity 1
  transition opacity 0.1s ease-out, transform $t cubic-bezier(0.23, 1, 0.32, 1)

/**
 * Demo specific CSS
 */

body
  height 100vh
  background $red

img
  max-width 100%

.demo-btns

  header
    padding 7vh 10vw
    background $modal-bg
    display flex
    align-items center

    h1
      margin 0
      color rgba(black, 0.54)
      font-weight 300

  .info
    background $red
    padding 3vh 10vw
    height 70vh
    display flex
    align-items center
    justify-content center
    flex-flow column wrap

  p
    text-align: center
    color white

  .link
    font-size 20px

  .modal__trigger
    margin-right 3px
    @media (max-width 640px)
      margin-bottom ($space / 3)

.demo-close
  position absolute
  top 0
  right 0
  margin: ($space / 2)
  padding: ($space / 4)
  background rgba(black, 0.3)
  border-radius 50%
  $ease()

  svg
    width 24px
    fill: white
    pointer-events none
    vertical-align top

  &:hover
    background rgba(black, 0.6);

.logo
  position: fixed
  bottom: 3vh
  right: 3vw
  z-index: 2

  img
    width: 45px
    transform: rotate(0)
    $ease()

    &:hover
      transform: rotate(180deg) scale(1.1)

var Modal = (function() {

  var trigger = $qsa('.modal__trigger'); // what you click to activate the modal
  var modals = $qsa('.modal'); // the entire modal (takes up entire window)
  var modalsbg = $qsa('.modal__bg'); // the entire modal (takes up entire window)
  var content = $qsa('.modal__content'); // the inner content of the modal
  var closers = $qsa('.modal__close'); // an element used to close the modal
  var w = window;
  var isOpen = false;
  var contentDelay = 400; // duration after you click the button and wait for the content to show
  var len = trigger.length;

  // make it easier for yourself by not having to type as much to select an element
  function $qsa(el) {
    return document.querySelectorAll(el);
  }

  var getId = function(event) {

    event.preventDefault();
    var self = this;
    // get the value of the data-modal attribute from the button
    var modalId = self.dataset.modal;
    var len = modalId.length;
    // remove the '#' from the string
    var modalIdTrimmed = modalId.substring(1, len);
    // select the modal we want to activate
    var modal = document.getElementById(modalIdTrimmed);
    // execute function that creates the temporary expanding div
    makeDiv(self, modal);
  };

  var makeDiv = function(self, modal) {

    var fakediv = document.getElementById('modal__temp');

    /**
     * if there isn't a 'fakediv', create one and append it to the button that was
     * clicked. after that execute the function 'moveTrig' which handles the animations.
     */

    if (fakediv === null) {
      var div = document.createElement('div');
      div.id = 'modal__temp';
      self.appendChild(div);
      moveTrig(self, modal, div);
    }
  };

  var moveTrig = function(trig, modal, div) {
    var trigProps = trig.getBoundingClientRect();
    var m = modal;
    var mProps = m.querySelector('.modal__content').getBoundingClientRect();
    var transX, transY, scaleX, scaleY;
    var xc = w.innerWidth / 2;
    var yc = w.innerHeight / 2;

    // this class increases z-index value so the button goes overtop the other buttons
    trig.classList.add('modal__trigger--active');

    // these values are used for scale the temporary div to the same size as the modal
    scaleX = mProps.width / trigProps.width;
    scaleY = mProps.height / trigProps.height;

    scaleX = scaleX.toFixed(3); // round to 3 decimal places
    scaleY = scaleY.toFixed(3);


    // these values are used to move the button to the center of the window
    transX = Math.round(xc - trigProps.left - trigProps.width / 2);
    transY = Math.round(yc - trigProps.top - trigProps.height / 2);

    // if the modal is aligned to the top then move the button to the center-y of the modal instead of the window
    if (m.classList.contains('modal--align-top')) {
      transY = Math.round(mProps.height / 2 + mProps.top - trigProps.top - trigProps.height / 2);
    }


    // translate button to center of screen
    trig.style.transform = 'translate(' + transX + 'px, ' + transY + 'px)';
    trig.style.webkitTransform = 'translate(' + transX + 'px, ' + transY + 'px)';
    // expand temporary div to the same size as the modal
    div.style.transform = 'scale(' + scaleX + ',' + scaleY + ')';
    div.style.webkitTransform = 'scale(' + scaleX + ',' + scaleY + ')';


    window.setTimeout(function() {
      window.requestAnimationFrame(function() {
        open(m, div);
      });
    }, contentDelay);

  };

  var open = function(m, div) {

    if (!isOpen) {
      // select the content inside the modal
      var content = m.querySelector('.modal__content');
      // reveal the modal
      m.classList.add('modal--active');
      // reveal the modal content
      content.classList.add('modal__content--active');

      /**
       * when the modal content is finished transitioning, fadeout the temporary
       * expanding div so when the window resizes it isn't visible ( it doesn't
       * move with the window).
       */

      content.addEventListener('transitionend', hideDiv, false);

      isOpen = true;
    }

    function hideDiv() {
      // fadeout div so that it can't be seen when the window is resized
      div.style.opacity = '0';
      content.removeEventListener('transitionend', hideDiv, false);
    }
  };

  var close = function(event) {

    event.preventDefault();
    event.stopImmediatePropagation();

    var target = event.target;
    var div = document.getElementById('modal__temp');

    /**
     * make sure the modal__bg or modal__close was clicked, we don't want to be able to click
     * inside the modal and have it close.
     */

    if (isOpen && target.classList.contains('modal__bg') || target.classList.contains('modal__close')) {

      // make the hidden div visible again and remove the transforms so it scales back to its original size
      div.style.opacity = '1';
      div.removeAttribute('style');

      /**
      * iterate through the modals and modal contents and triggers to remove their active classes.
      * remove the inline css from the trigger to move it back into its original position.
      */

      for (var i = 0; i < len; i++) {
        modals[i].classList.remove('modal--active');
        content[i].classList.remove('modal__content--active');
        trigger[i].style.transform = 'none';
        trigger[i].style.webkitTransform = 'none';
        trigger[i].classList.remove('modal__trigger--active');
      }

      // when the temporary div is opacity:1 again, we want to remove it from the dom
      div.addEventListener('transitionend', removeDiv, false);

      isOpen = false;

    }

    function removeDiv() {
      setTimeout(function() {
        window.requestAnimationFrame(function() {
          // remove the temp div from the dom with a slight delay so the animation looks good
          div.remove();
        });
      }, contentDelay - 50);
    }

  };

  var bindActions = function() {
    for (var i = 0; i < len; i++) {
      trigger[i].addEventListener('click', getId, false);
      closers[i].addEventListener('click', close, false);
      modalsbg[i].addEventListener('click', close, false);
    }
  };

  var init = function() {
    bindActions();
  };

  return {
    init: init
  };

}());

Modal.init();