.panel#js-panel
  .panel__content
    %h4 Just Checking...
    %h2 Delete your Account?
    %p This action is final and you will be unable to recover any data
  .panel__flaps
    .flap.outer.flap--left
    %a.flap.flap__btn{href:'#'} YES
    %a.flap.flap__btn{href:'#'} NO
    .flap.outer.flap--right

%a#js-replay.replay{href:'#'} Replay

@import url(https://fonts.googleapis.com/css?family=Lato:300,400,700);

// Variables
$body-bg:  #2e2e2e;
$purple:   #865fdf;
$btn-bg:   #8f69e8;
$panel-bg: #fff;
$ease:     cubic-bezier(0.55, 0.085, 0.68, 0.53);
$quart:    cubic-bezier(0.165, 0.84, 0.44, 1);

.panel {
  background: rgba(black, .3);
  box-shadow: 0 0 30px 10px rgba(black, .3);
  border-radius: 25px;
  transition: .2s $ease;
  transform: rotateX(-90deg);
  &.is--open {
    transform: rotateX(0deg);
  }
}

.panel__content {
  padding-bottom: 4em;
  background: $panel-bg;
  border-top-left-radius: 25px;
  border-top-right-radius: 25px;
  color: #5a5a5a;
  text-align: center;
  
  h4 {
    padding: 1.5em 0;
    border-bottom: 2px solid #ededed;
    color: $purple;
    font-size: 1.15em;
    font-weight: 700;
    text-transform: uppercase;
  }
  h2 {
    padding: .5em 1.5em;
    font-size: 3em;
    font-weight: 300;
  }
  p {
    margin: auto;
    width: 55%;
    font-size: 1.15em;
    font-weight: 300;
    line-height: 1.4;
  }
}

.panel__flaps {
  display: flex;
  perspective: 1000px;
  transform-style: preserve-3d;
}
  .flap {
    height: 100px;
    background: $purple;
  }
    .flap__btn {
      width: calc((100% - 212px) / 2);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: $btn-bg;
      color: white;
      cursor: pointer;
      font-size: 2.25em;
      font-weight: 700;
      text-decoration: none;
      z-index: 1;
      transition: .2s ease;
      transform: translate3d(0,0,0);
      transform-origin: top center;
      
      &:hover,
      &:focus {
        background: $purple;
        outline: none;
        transform: rotateX(-25deg) translate3d(0,0,0);
      }
    }
    .outer { width: 106px; }
    .flap--left {
      border-bottom-left-radius: 25px;
      transform-origin: top right;
    }
    .flap--right {
      border-bottom-right-radius: 25px;
      transform-origin: top left;
    }
  .is--open {
    .outer {
      animation: swing 1.5s .2s ease;
    }
    .flap__btn:first-of-type {
      animation: swing 1.5s .3s ease;
    }
    .flap__btn:last-of-type {
      animation: swing 1.5s .4s ease;
    }
  }

@keyframes swing {
  10%  { transform: rotateX(25deg);   }
  50%  { transform: rotateX(-15deg);  }
  75%  { transform: rotateX(5deg);    }
  90%  { transform: rotateX(-2.5deg); }
  100% { transform: rotateX(0deg);    }
}

.replay {
  position: absolute;
  top: 50%;
  left: 50%;
  padding: .5em;
  background: $purple;
  border-radius: 3px;
  color: white;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  text-decoration: none;
  transition: all .3s;
  transform: translate(-50%,-50%);
  
  &:hover,
  &:focus  {
    background: $btn-bg;
    outline: none;
    box-shadow: 0 0 25px $purple;
  }
  &:active {
    transform: translate(-50%,-50%) scale(.9);
  }
  
  &.is--active {
    opacity: 1;
    pointer-events: initial;
  }
}


// Presentation Styles
*, *:before, *:after {
  -webkit-font-smoothing: antialiased;
          font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  box-sizing: border-box;
}
html, body { height: 100%; }
body {
  display: flex;
  align-items: center;
  justify-content: center;
  
  background: $body-bg;
  font-family: "Lato", Arial, sans-serif;
  perspective: 1000px;
  transform-style: preserve-3d;
}

(function() {
  // Variables
  var panel     = document.getElementById("js-panel");
  var btns      = document.querySelectorAll(".flap__btn");
  var btnReplay = document.getElementById("js-replay");
  
  // On load, init panel
  var init = function() {
    panel.classList.add("is--open");
    
    // If btns are clicked, hide panel
    // Show replay button    
    for (var i=0; i < btns.length; i++) {
      btns[i].addEventListener("click", function() {
        hidePanel();
      });
    }
    
    function hidePanel() {
      panel.classList.remove("is--open");
      btnReplay.classList.add("is--active");
    }
    
    // When replay button is clicked,
    // reset the stage.
    btnReplay.addEventListener("click", function() {
      resetStage();
    });
  }
  
  // Hide the button and re-call init
  function resetStage() {
    btnReplay.classList.remove("is--active");
    init();
  }
  
  // On load, call init function
  window.onload = function() {
    init();
  }
})();