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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div class="wrapper">

<div class="start-screen">
  <section>
    <h1>Back to the Future</h1>
    <p>click to play</p>
    <p class="note">Built in Chrome.</p>
  </section>
</div>

<div class="overlay intro">
  <section class="intro">
    <h1>Back to the Future</h1>
    <p>Get Marty back to 1985.</p>
    
    <h2>Controls</h2>
    <ul class="controls">
      <li>&larr;</li>
      <li>&rarr;</li>
    </ul>
    
    <h2>Items</h2>
    <h3>Collect</h3><h3>Avoid</h3>
    <ul class="items">
      <li><div class="item lightning active" data-stage="1" data-lane="1"></div></li>
      <li><div class="item almanac" data-stage="2" data-lane="2"></div></li>
      <li><div class="item logs" data-stage="3" data-lane="3">1</div></li>
      <li><div class="item oil obstacle active" data-stage="1" data-lane="1"></div></li>
      <li><div class="item cloud obstacle" data-stage="2" data-lane="2"></div></li>
      <li><div class="item cactus obstacle" data-stage="3" data-lane="3"></div></li>
    </ul>
    
    <button class="start">Start</button>
  </section>
  
  <section class="win">
    <h2>Perfect. My experiment worked.</h2>
    <p>You got Marty back to 1985.</p>
    <button class="continue">Continue to Stage <span>2</span></button>
  </section>
  
  <section class="lose">
    <h2>Great scott.</h2>
    <p>You didn't get Marty back to 1985.</p>
    <button class="reset">Try again</button>
  </section>
</div>

<div class="game-wrap">
  <div class="mute"></div>
  
  <div class="hud">
    <div class="speedometer">0</div>
    
    <ul class="clock">
      <li class="stage">Stage <span>1</span></li>
      <li class="destination">Dest. Time: <span>1985</span></li>
      <li class="present">Pres. Time: <span>1955</span></li>
    </ul>
    
    <div class="flux">0<span>%</span></div>
  </div>
  
  <div class="countdown" data-count="3"></div>

  <div class="road"></div>
  <div class="time-machine" data-lane="2"></div>
</div>

<audio id="soundtrack" src="http://joshuabader.com/drop/bttf/bttf.mp3" loop />
<audio id="beep-low" src="http://joshuabader.com/drop/bttf/beep-low.mp3" />
<audio id="beep-high" src="http://joshuabader.com/drop/bttf/beep-high.mp3" />
<audio id="power-up" src="http://joshuabader.com/drop/bttf/power-up.mp3" />
<audio id="buzz" src="http://joshuabader.com/drop/bttf/buzz.mp3" />
<audio id="zap" src="http://joshuabader.com/drop/bttf/zap.mp3" />
<audio id="fail" src="http://joshuabader.com/drop/bttf/fail.mp3" />

<!-- filters -->

<svg height="0" xmlns="http://www.w3.org/2000/svg">
  <filter id="flat-shadow">
    <feGaussianBlur in="SourceAlpha" stdDeviation="0"/>
    <feOffset dx="3" dy="3" result="offsetblur"/>
    <feFlood flood-color="rgba(0,0,0,0.3)"/>
    <feComposite in2="offsetblur" operator="in"/>
    <feMerge>
      <feMergeNode/>
      <feMergeNode in="SourceGraphic"/>
    </feMerge>
  </filter>
</svg>

</div>
            
          
!
            
              *, *:before, *:after {
  box-sizing: border-box;
  outline: none; }

html, body { height: 100%; }

body {
  font-family: digital, sans-serif;
  background: #111; }

.wrapper {
  position: relative;
  width: 600px; height: 100%;
  margin: 0 auto; overflow: hidden;
  background-color: #8cba43;
  background-image: linear-gradient(90deg, rgba(0,0,0,0.05) 50%, transparent 50%);
  background-size: 10px 10px;
  box-shadow: 0 0 20px #000;
  overflow: hidden; }
.wrapper:before, .wrapper:after {
  content: '';
  position: absolute; z-index: 0;
  top: 0; left: 50%;
  display: block;
  width: 480px; height: 120%;
  margin: auto;
  background-color: #d6d6d6;
  background-image: linear-gradient(0deg, rgba(255,255,255,0.5) 0, rgba(0,0,0,0.1) 2px, transparent 4px);
  background-size: 80px 80px;
  border: 2px solid #bbb;
  transform: translate3d(-50%,0,0); }
.wrapper:after {
  width: 330px;
  background: #222;
  border: 8px solid #bbb; }

.wrapper[data-stage="1"] { background-color: #8cba43; }

.wrapper[data-stage="2"] { background-color: #3bafda; }
.wrapper[data-stage="2"]:before {
  width: 400px;
  background-color: transparent;
  background-image:
    radial-gradient(circle at top, #ecf9fe 28%, transparent 30%),
    radial-gradient(circle at bottom, #ecf9fe 28%, transparent 30%),
    radial-gradient(#ecf9fe 48%, transparent 50%);
  background-size: 100px 100px;
  border: none; }
.wrapper[data-stage="2"]:after {
  width: 340px;
  background: #ecf9fe;
  border: none; }

.wrapper[data-stage="3"] { background-color: #cfa763; }
.wrapper[data-stage="3"]:before {
  background: #755729;
  border: none; }
.wrapper[data-stage="3"]:after {
  width: 340px;
  background: #92713e;
  border: none; }

.wrapper.play:before { animation: drive 150ms linear infinite; }

.start-screen {
  position: absolute; z-index: 10000;
  top: -0.5%; left: -0.5%;
  display: table;
  width: 101%; height: 101%;
  color: #fddc73; text-align: center;
  background: #333;
  cursor: pointer; }
.start-screen section {
  display: table-cell;
  vertical-align: middle; }
.start-screen h1 { font-size: 48px; }
.start-screen p { color: rgba(255,255,255,0.5); }
.start-screen .note {
  position: absolute;
  bottom: 1em; width: 100%;
  text-align: center; }

.overlay {
  position: absolute; z-index: 5000;
  top: 50%; left: 50%;
  width: 420px;
  padding: 20px;
  text-align: center;
  background: #000; border: 5px solid #4d4d4d;
  box-shadow:
    inset 0 0 0 10px #d6d6d6,
    0 10px 0 -5px rgba(0,0,0,0.2);
  transform: translate(-50%, -50%) scale(1); }
.overlay.animate { transition: transform 300ms; }
.overlay.hide { transform: translate(-50%, -50%) scale(0); }

.overlay h1,
.overlay h2,
.overlay h3,
.overlay p {
  margin-bottom: 5px;
  font-size: 30px; line-height: 1.5em; color: #fddc73;
  background: #332a25; }
.overlay h1 { color: #02d174 ; }
.overlay h2 { font-size: 20px; color: #ff5454; }
.overlay h3 {
  display: inline-block; width: 50%;
  font-size: 16px; }
.overlay p { font-size: 16px; }
.overlay .win h2 { color: #02d174; }

.overlay .controls {
  padding: 10px; margin-bottom: 5px;
  background: #332a25; }
.overlay .controls li, .overlay button {
  display: inline-block;
  width: 40px; margin: 5px;
  color: #333; line-height: 40px;
  background: #ddd; border-radius: 3px;
  box-shadow:
    inset 2px 2px #fff,
    inset -2px -2px #bbb,
    4px 4px rgba(0,0,0,0.2); }

.overlay .items {
  float: left; width: 100%;
  padding: 5px 10px 5px 5px; margin-bottom: 5px;
  background: #332a25; }
.overlay .items li { float: left; display: block; width: 50%; }
.overlay .item {
  position: relative;
  display: none; margin: auto;
  transform: scale(0.7); }
.overlay .item.active { display: inline-block; }
.overlay .cloud { margin: 10px 0 0 15px; }
.overlay .cactus { margin-left: 15px; }

.overlay button {
  width: 100%; margin: 0;
  font: 24px/40px digital;
  background: #ddd;
  border: none; border-radius: 3px;
  cursor: pointer; }

.overlay *:last-child { margin-bottom: 0; }
.overlay > * { display: none; }
.overlay.intro .intro,
.overlay.win .win,
.overlay.lose .lose { display: block; }

.mute {
  position: absolute; z-index: 10000;
  bottom: 20px; right: 20px;
  width: 40px; height: 40px;
  background: #000; border-radius: 3px;
  opacity: 0.3; cursor: pointer; }
.mute:before, .mute:after {
  content: '';
  position: absolute;
  top: 9px; left: 5px;
  display: block;
  width: 15px; height: 20px;
  background: #fff;
  border: 6px solid #000;
  border-right-color: #fff; }
.mute:after {
  top: 12px; left: 14px;
  height: 15px;
  background: transparent;
  border: 6px double transparent;
  border-right-color: #fff;
  border-radius: 50%;
  box-shadow: 0 0;
}
.mute.muted:after { display: none; }

.hud {
  position: absolute; z-index: 100;
  width: 100%; padding: 10px;
  background: #4d4d4d;
  overflow: hidden; }

.speedometer {
  position: relative;
  float: left;
  width: 140px; height: 60px;
  padding: 8px;
  font-size: 36px; line-height: 1em;
  color: #fddc73; background: #332a25;
  border: 5px solid #000; border-radius: 0 10px 10px 0;
  box-shadow: inset -50px 0 #000; }
.speedometer:before, .speedometer:after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  display: block;
  width: 44px; height: 44px;
  margin: 3px 0 0 5px;
  padding-top: 10px;
  background: #4d4d4d;
  border: 3px solid #d6d6d6; border-radius: 50%;
  box-shadow: inset 0 0 0 3px #000;
  overflow: hidden; }
.speedometer:after {
  width: 2px; height: 20px;
  margin: 10px 20px 0 0;
  background: #ff5454;
  border: none; border-radius: 0;
  box-shadow: none;
  transform: rotate(-45deg);
  transform-origin: 50% 75%; }
.play .speedometer:after { animation: speedometer 1000ms linear infinite alternate; }
.win .speedometer:after { transform: rotate(45deg); }

.clock {
  position: absolute; left: 50%;
  width: 170px; padding: 5px;
  color: #fddc73 ; font-size: 14px;
  background: #000;
  transform: translateX(-50%); }
.clock li {
  float: right; width: 105px; padding: 4px;
  line-height: 1em;
  background: #332a25; }
.clock li.stage {
  float: left; width: 50px;
  text-align: center; }
.clock li.stage span {
  width: 100%;
  font-size: 28px; line-height: 1em; }
.clock span { display: block; float: right; }
.clock .destination { margin-bottom: 6px; color: #ff5454; }
.clock .present { color: #02d174; }

.flux {
  position: relative;
  float: right;
  width: 140px; height: 60px;
  padding: 8px;
  font-size: 36px; line-height: 1em; text-align: right;
  color: #fddc73; background: #332a25;
  border: 5px solid #000; border-radius: 10px 0 0 10px;
  box-shadow: inset 50px 0 #000; }
.flux:before, .flux:after {
  content: 'Y';
  position: absolute;
  top: 0; left: 0;
  display: block;
  width: 44px; height: 50px;
  margin-right: 5px;
  padding-top: 10px;
  color: rgba(255,255,200,1); font: 29px/1em Verdana ; text-align: center;
  background: #4d4d4d; border-radius: 5px;
  overflow: hidden; }
.flux:after {
  content: '\2022';
  padding: 5px 0 0 10px;
  color: #ff5454; font-size: 18px; text-align: left;
  text-shadow: 14px 0, 7px 20px;
  background: transparent; border: 0;
  box-shadow:
    inset 0 0 0 3px #d6d6d6,
    inset 0 0 0 6px #000; }
.flux span { font-size: small; }

.countdown {
  position: absolute; z-index: 1000;
  top: 50%; left: 50%;
  display: none; margin-top: 60px;
  color: #fddc73;
  transform: translate(-50%, -50%); }
.countdown:after {
  content: attr(data-count);
  display: block;
  font: 120px/1em digital; text-align: center; }
.countdown.start { display: block; }

.road {
  position: absolute; z-index: 1;
  top: 0; left: 50%;
  width: 115px; height: 1992px;
  border: 8px dashed #fff;
  border-top: none;
  border-bottom: none;
  opacity: 0.5;
  transform: translate3d(-50%, 0, 0); }

[data-stage="2"] .road { border: none; }

[data-stage="3"] .road {
  width: 320px;
  background-image: linear-gradient(180deg, #452b00 50%, rgba(0,0,0,0.1) 50%, rgba(0,0,0,0.1) 60%, transparent 60%);
  background-size: 50px 50px;
  border: none;
  opacity: 1; }
[data-stage="3"] .road:before {
  content: '';
  display: block;
  width: 300px; height: 100%;
  margin: auto;
  border: 8px solid #999;
  box-shadow: inset 0 0 0 5px rgba(0,0,0,0.1); }

.play .road { animation: drive 50ms linear infinite; }

.time-machine {
  position: absolute; z-index: 10;
  top: 80px; left: 50%;
  width: 80px; height: 120px;
  margin: 80px auto 20px;
  background: #bbb;
  border-bottom: 5px solid #aaa;
  border-radius: 0 0 8% 8% / 0 0 100% 100%;
  box-shadow:
    inset 5px 0 rgba(0,0,0,0.15),
    inset -5px 0 rgba(0,0,0,0.15),
    
    inset 0 -4px rgba(0,0,0,0.3),
    inset 0 -13px 0 -5px rgba(255,255,200,0.6),
    inset 0 -11px rgba(0,0,0,0.15),
    
    inset 15px 0 rgba(0,0,0,0.05),
    inset 17px 0 rgba(255,255,255,0.2),
    inset -15px 0 rgba(0,0,0,0.05),
    inset -17px 0 rgba(255,255,255,0.2),
    
    -18px -75px 0 -30px #333,
    18px -75px 0 -30px #333;
  -webkit-filter: drop-shadow(0 0 20px rgba(0,0,0,1));
  filter: drop-shadow(0 0 20px rgba(0,0,0,1));
  transform: translate(-50%, -300px);
  transition: transform 1000ms;
  backface-visibility: hidden;
  visibility: hidden; }

[data-stage="2"] .time-machine {
  -webkit-filter: drop-shadow(0 0 20px rgba(255,255,255,0.8));
  filter: drop-shadow(0 0 20px rgba(255,255,255,0.8)); }

[data-stage="3"] .time-machine {
  -webkit-filter: drop-shadow(0 0 20px rgba(0,0,0,0.3));
  filter: drop-shadow(0 0 20px rgba(0,0,0,0.3)); }

.time-machine:before {
  content: '';
  position: absolute; top: -35px;
  display: block; width: 100%; height: 35px;
  background: #444;
  border-radius: 100% 100% 0 0 / 60% 60% 0 0;
  box-shadow:
    inset 7px 0 0 -2px rgba(0,0,0,0.15),
    inset -7px 0 0 -2px rgba(0,0,0,0.15),
    
    inset 22px -10px 0 -10px #bbb,
    inset 42px -10px 0 -10px #333,
    inset -22px -10px 0 -10px #bbb,
    inset -42px -10px 0 -10px #333; }
.time-machine:after {
  content: '';
  position: absolute;
  display: block; width: 70px; height: 65px;
  margin: 0 5px;
  background: #bbb;
  border-width: 10px;
  border-style: solid;
  border-color: #cdd;
  border-top: 5px solid #888;
  border-bottom: 30px solid #dee;
  border-radius: 0 0 100% 100% / 0 0 60% 60%;
  box-shadow:
    inset 15px 0 rgba(0,0,0,0.05),
    inset 17px 0 rgba(255,255,255,0.2),
    inset -15px 0 rgba(0,0,0,0.05),
    inset -17px 0 rgba(255,255,255,0.2),
    
    0 77px 0 -31px #aaa,
    0 77px 0 -29px #333,
    -10px 77px 0 -29px #333,
    10px 77px 0 -29px #333; }
.time-machine.score { animation: score 100ms infinite; }
.time-machine.slip { animation: slip 100ms infinite; }

.time-machine.get-set { visibility: visible; transform: translate(-50%, 0); }
.play .time-machine { transition: transform 100ms; }
.play .time-machine[data-lane="1"],
.win .time-machine[data-lane="1"] { transform: translate(-185%, 0); }
.play .time-machine[data-lane="2"],
.win .time-machine[data-lane="2"] { transform: translate(-50%, 0); }
.play .time-machine[data-lane="3"],
.win .time-machine[data-lane="3"] { transform: translate(88%, 0); }

.win .time-machine {
  margin-top: 2000px;
  transition: margin 300ms; }
.time-machine span {
  position: absolute;
  bottom: 165px; margin-left: 10px;
  display: block;
  width: 60px; height: 2500px;
  box-shadow:
    inset 10px 0 10px #fa0,
    inset -10px 0 10px #fa0;
  -webkit-filter: blur(1px);
  filter: blur(1px);
  animation: fade-out 2000ms;
  animation-delay: 2000ms;
  animation-iteration-count: 1;
  animation-fill-mode: forwards; }
[data-stage="3"] .time-machine span {
  box-shadow:
    inset 0 -20px 40px 10px #cfa763,
    inset 12px 0 5px #f90,
    inset -12px 0 5px #f90; }

.item {
  position: relative;
  will-change: transform; }
.wrapper > .item {
  position: absolute; z-index: 5;
  top: 100%; left: 50%;
  animation: move-item 2000ms linear infinite; }

.lightning {
  width: 55px; height: 80px;
  margin-left: -25px;
  -webkit-filter: drop-shadow(5px 5px rgba(0,0,0,0.2));
  /*filter: url(#flat-shadow);*/
  filter: drop-shadow(5px 5px rgba(0,0,0,0.2)); }
.lightning:before, .lightning:after {
  content: '';
  position: absolute; top: 0; left: 5px;
  display: block;
  border-top: 24px solid transparent;
  border-right: 12px solid #fddc73;
  border-bottom: 24px solid #fddc73;
  border-left: 12px solid transparent; }
.lightning:after {
  top: auto; left: auto;
  bottom: 0; right: 5px;
  border-top: 24px solid #fddc73;
  border-right: 12px solid transparent;
  border-bottom: 24px solid transparent;
  border-left: 12px solid #fddc73; }

.wrapper > .lightning[data-lane="1"] { margin-left: -135px; }
.wrapper > .lightning[data-lane="2"] { margin-left: -25px; }
.wrapper > .lightning[data-lane="3"] { margin-left: 85px; }

.almanac {
  width: 55px; height: 80px;
  margin-left: -27px;
  background: #ff5454;
  box-shadow:
    inset 5px 0 0 rgba(0,0,0,0.2),
    
    2px 0 0 -1px #eee,
    4px 0 0 -2px #ccc,
    6px 0 0 -3px #eee,
    
    8px 5px 0 rgba(0,0,0,0.2);
  overflow: hidden; }
.almanac:before, .almanac:after {
  content: 'Sports';
  display: block; margin-top: 9px;
  color: #ff5454; font: bold 10px/2em sans-serif;
  text-transform: uppercase; text-align: center;
  background: #fff; box-shadow: inset 5px 0 0 rgba(0,0,0,0.1);
  transform: skewY(-10deg); }
.almanac:after {
  content: 'Almanac';
  padding-bottom: 4px; margin-top: -1px;
  color: #555; font: 9px/1em sans-serif;
  box-shadow:
    inset 5px 0 0 rgba(0,0,0,0.1),
    
    -50px 30px 0 rgba(0,0,0,0.1),
    0 10px #222, 0 30px #fddc73; }

.wrapper > .almanac[data-lane="1"] { margin-left: -137px; }
.wrapper > .almanac[data-lane="2"] { margin-left: -27px; }
.wrapper > .almanac[data-lane="3"] { margin-left: 83px; }

.logs {
  width: 20px; height: 80px;
  margin-left: -10px;
  font: bold 100%/80px impact, sans-serif; text-align: center;
  background: #02d174 linear-gradient(0deg, #02d174 30%, #fff 30%, #fff 70%, #02d174 70%);
  border-radius: 10px / 5px;
  box-shadow: inset -5px 0 0 rgba(0,0,0,0.2);
  -webkit-filter: drop-shadow(4px 4px rgba(0,0,0,0.2));
  /*filter: url(#flat-shadow);*/
  filter: drop-shadow(4px 4px rgba(0,0,0,0.2)); }
.logs:before, .logs:after {
  content: '2';
  position: absolute;
  top: 0; left: -90%;
  display: block;
  width: 20px; height: 80px;
  background: #fddc73 linear-gradient(0deg, #fddc73 30%, #fff 30%, #fff 70%, #fddc73 70%);
  border-radius: 10px / 5px;
  box-shadow: inset -5px 0 0 rgba(0,0,0,0.2);
  transform: scale(0.8); }
.logs:after {
  content: '3';
  left: 90%;
  background: #ff5454 linear-gradient(0deg, #ff5454 30%, #fff 30%, #fff 70%, #ff5454 70%); }

.wrapper > .logs[data-lane="1"] { margin-left: -118px; }
.wrapper > .logs[data-lane="2"] { margin-left: -8px; }
.wrapper > .logs[data-lane="3"] { margin-left: 98px; }

.oil {
  width: 40px; height: 60px;
  background: #000; border-radius: 15px;
  box-shadow:
    inset 0 0 0 3px #000,
    inset 6px 2px #333,
    inset 2px 6px #333;
  -webkit-filter: drop-shadow(3px 3px rgba(0,0,0,0.2));
  /*filter: url(#flat-shadow);*/
  filter: drop-shadow(3px 3px rgba(0,0,0,0.2)); }
.oil:before, .oil:after {
  content: '';
  position: absolute;
  top: 10px; left: 10px;
  display: block;
  width: 50px; height: 40px;
  background: #000; border-radius: 15px;
  box-shadow:
    inset 0 0 0 3px #000,
    inset -6px 0 #333; }
.oil:after {
  width: 40px; height: 50px;
  top: 35px; left: 10px;
  box-shadow:
    inset 0 0 0 3px #000,
    inset 0 -6px #333; }

.wrapper > .oil[data-lane="1"] { margin-left: -135px; }
.wrapper > .oil[data-lane="2"] { margin-left: -30px; }
.wrapper > .oil[data-lane="3"] { margin-left: 80px; }

.cloud {
  width: 55px; height: 60px;
  margin-left: 20px;
  background: #999; border-radius: 50% 50% 0 0;
  box-shadow: none;
  -webkit-filter: drop-shadow(3px 3px rgba(0,0,0,0.2));
  /*filter: url(#flat-shadow);*/
  filter: drop-shadow(3px 3px rgba(0,0,0,0.2)); }
.cloud:before, .cloud:after {
  content: '';
  position: absolute;
  top: 20px; left: -20px;
  display: block;
  width: 40px; height: 40px;
  color: #999;
  background: #999; border-radius: 20px;
  box-shadow: none; }
.cloud:after {
  top: 25px; left: 40px;
  width: 35px; height: 35px; }

.wrapper > .cloud[data-lane="1"] { margin-left: -135px; }
.wrapper > .cloud[data-lane="2"] { margin-left: -30px; }
.wrapper > .cloud[data-lane="3"] { margin-left: 80px; }

.cactus {
  width: 24px; height: 80px;
  margin-left: 13px;
  background: #02d174; border-radius: 12px 12px 0 0;
  box-shadow: none;
  -webkit-filter: drop-shadow(3px 3px rgba(0,0,0,0.2));
  /*filter: url(#flat-shadow);*/
  filter: drop-shadow(3px 3px rgba(0,0,0,0.2)); }
.cactus:before, .cactus:after {
  content: '';
  position: absolute;
  top: 15px; left: -12px;
  display: block;
  width: 10px; height: 10px;
  color: #02d174;
  background: #02d174; border-radius: 5px 5px 2px 2px;
  box-shadow:
    0 5px,
    0 10px,
    0 15px,
    0 20px,
    3px 20px 0 3px; }
.cactus:after {
  top: 10px; left: 26px;
  box-shadow:
    0 5px,
    0 10px,
    0 15px,
    0 20px,
    -3px 20px 0 3px; }

.wrapper > .cactus[data-lane="1"] { margin-left: -120px; }
.wrapper > .cactus[data-lane="2"] { margin-left: -15px; }
.wrapper > .cactus[data-lane="3"] { margin-left: 95px; }


/* Animations */

@keyframes speedometer {
  0% { transform: rotate(-45deg); }
  100% { transform: rotate(45deg); }
}

@keyframes drive {
  0% { transform: translate3d(-50%, 0, 0); }
  100% { transform: translate3d(-50%, -50px, 0); }
}

@keyframes move-item {
  0% { /*top: 100%;*/ transform: translate3d(0, 0, 0); }
  100% { /*top: -50%;*/ transform: translate3d(0, -1200px, 0); }
}

@keyframes score {
  0% {
    /*opacity: 1;*/
    -webkit-filter: drop-shadow(0 0 5px rgba(200,200,50,0.8));
    filter: drop-shadow(0 0 5px rgba(200,200,50,0.8)); }
  100% {
    /*opacity: 0.8;*/
    -webkit-filter: drop-shadow(0 0 20px rgba(200,200,50,0.8)) sepia(0.5);
    filter: drop-shadow(0 0 20px rgba(200,200,50,0.8)) sepia(0.5); }
}

@keyframes slip {
  0% {
    /*opacity: 1;*/
    -webkit-filter: drop-shadow(0 0 5px rgba(200,50,50,0.8));
    filter: drop-shadow(0 0 5px rgba(200,50,50,0.8)); }
  100% {
    /*opacity: 0.8;*/
    -webkit-filter: drop-shadow(0 0 20px rgba(200,50,50,0.8)) sepia(0.5) hue-rotate(-45deg);
    filter: drop-shadow(0 0 20px rgba(200,50,50,0.8)) sepia(0.5) hue-rotate(-45deg); }
}

@keyframes fade-out {
  0% { opacity: 1; }
  100% { opacity: 0; }
}


/* Fonts */

@font-face {
    font-family: 'digital';
    src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/38273/digital-webfont.woff');
    font-weight: normal;
    font-style: normal;
}
            
          
!
            
              ////////////
// Global //
////////////

var doc = $(document);
var win = $(window);
var bdy = $('body');
var wrapper = $('.wrapper');
var startScreen = $('.start-screen');
var overlay = $('.overlay');
var mute = $('.mute');
var hud = $('.hud');
var speedometer = $('.speedometer');
var flux = $('.flux');
var countdown = $('.countdown');
var road = $('.road');
var timeMachine = $('.time-machine');
var items = $('.items');

var stage = 1;
var stages = [1955,2015,1885];
var carMin = 40;
var carMax = 88;
var minSpeed = 2000;
var maxSpeed;
var currentSpeed;
var carSpeed;
var fluxCount;
var fluxMax = 100;
var timeMachinePos = parseInt(timeMachine.css('top')) + 150;

var carAccelerator, itemGenerator, itemAccelerator;

var soundtrack = document.getElementById('soundtrack');
var beepLow = document.getElementById('beep-low');
var beepHigh = document.getElementById('beep-high');
var powerUp = document.getElementById('power-up');
var buzz = document.getElementById('buzz');
var zap = document.getElementById('zap');
var fail = document.getElementById('fail');

reset();

///////////
// Audio //
///////////

function setVolume(mute) {
  if (mute) {
  	$('audio').each(function() {
    	this.volume = 0;
  	});
	} else {
    soundtrack.volume = 0.2;
		beepLow.volume = 0.5;
		beepHigh.volume = 0.5;
		powerUp.volume = 0.5;
    buzz.volume = 1;
		zap.volume = 0.5;
    fail.volume = 1;
  };
};

setVolume();

mute.on('click', function() {
  var self = $(this);
  
  self.toggleClass('muted');
  
  if (self.hasClass('muted')) {
    setVolume('mute');
  } else {
    setVolume();
  };
});

//////////////////
// Acceleration //
//////////////////

function accelerateCar() {
  if (speedometer.text() < 88) speedometer.text(carSpeed);
  
  if (carSpeed === 88) {
    clearInterval(carAccelerator);
    clearInterval(itemGenerator);
    clearInterval(itemAccelerator);
    
    wrapper.removeClass('play');
    wrapper.children('.item').remove();
    
    if (fluxCount >= fluxMax) {
      wrapper.addClass('win');
      timeMachine.append('<span />');
      timeMachine.addClass('slip');
      zap.play();
      setTimeout(function() { timeMachine.removeClass('slip'); }, 400);
    } else {
      soundtrack.pause();
      soundtrack.currentTime = 0;
      fail.play();
    };
    
    setTimeout(function() {
      overlay.removeClass('hide');
      if (fluxCount >= fluxMax) overlay.addClass('win');
      else overlay.addClass('lose');
    }, 1000);
  };
  
  carSpeed++;
};

function accelerateItems() {
  if (currentSpeed > maxSpeed && wrapper.hasClass('play')) {
    wrapper.find('.item').css('animation', 'move-item ' + currentSpeed + 'ms linear infinite');
    currentSpeed = currentSpeed - 100;
  };
};


///////////
// Items //
///////////

// Score
function score(slip) {
  if (!slip) {
    fluxCount++;
    timeMachine.addClass('score');
    powerUp.currentTime = 0;
    powerUp.play();
  }
  else {
    if (fluxCount > 0) fluxCount--;
    timeMachine.addClass('slip');
    buzz.currentTime = 0;
    buzz.play();
  };
  
  var fluxPercentage = Math.round(fluxCount / fluxMax * 100);
  
  if (fluxPercentage <= 100 && fluxPercentage >= 0) flux.html(fluxPercentage + '<span>%</span>');
  else if (fluxPercentage > 100 || fluxPercentage < 0) fluxCount = fluxMax;
  
  setTimeout(function() {
    timeMachine.removeClass('score');
    timeMachine.removeClass('slip');
  }, 400);
};

// Create Items
function createItem(activeItem) {
  var goodItemClone = items.find(activeItem[0]).clone(),
      badItemClone = items.find(activeItem[1]).clone(),
      newItemArray = [goodItemClone,badItemClone],
      newItem = newItemArray[Math.floor(Math.random()*newItemArray.length)];
  
  newItem.attr('data-lane', Math.floor((Math.random()*3)+1)).addClass('hold');
  newItem.appendTo('.wrapper');
};

// Remove Items
(function removeItem() {
  requestAnimationFrame(removeItem);
  
  var timeMachineLane = parseInt(timeMachine.attr('data-lane'));
  
  wrapper.children('.item').each(function() {
    var self = $(this),
        itemPosition = self.position().top,
        itemLane = self.data('lane');
    
    if (itemPosition <= timeMachinePos && itemPosition > 100 && timeMachineLane === itemLane && !wrapper.hasClass('win') && wrapper.hasClass('play')) {
      self.css('visibility', 'hidden');
      if (!self.hasClass('obstacle')) score();
      else score('slip');
    };
    
    if (itemPosition < -80 && wrapper.hasClass('play')) {
      self.remove();
    };
  });
})();


//////////
// Play //
//////////

overlay.find('.start').on('click', startCountdown);

function startCountdown() {
  var countStartNumber = countdown.data('count');
  
  timeMachine.addClass('get-set');
  overlay.addClass('animate').addClass('hide');
  setTimeout(function() { overlay.removeClass('intro'); }, 1000);
  
  countdown.addClass('start');
  
  (function countdownTimer() {
    if (countStartNumber >= 0) {
      countdown.attr('data-count', countStartNumber--);
      setTimeout(countdownTimer, 1000);
      
      if (countStartNumber < 0) {
        beepHigh.play();
        countdown.attr('data-count', 'GO');
      } else {
        beepLow.play();
      };
    }
    else {
      countdown.removeClass('start').attr('data-count', '3');
      play();
    };
  })();
};

function play() {
  wrapper.addClass('play');
  carAccelerator = setInterval(accelerateCar, 1000);
  
  itemGenerator = setInterval(function() {
    createItem(items.find('.active'));
  }, 500);
  
  itemAccelerator = setInterval(accelerateItems, 3000);
};


//////////////////
// Start Screen //
//////////////////

startScreen.on('click', function() {
  $(this).remove();
  if (!mute.hasClass('muted')) soundtrack.play();
});


///////////
// Reset //
///////////

overlay.find('.reset').on('click', function() {
  reset();
  if (!mute.hasClass('muted')) soundtrack.play();
  fail.pause();
  fail.currentTime = 0;
});

function reset() {
  maxSpeed = 500 + ((stage - stages.length) * -250);
  currentSpeed = minSpeed;
  carSpeed = carMin;
  fluxCount = 0;
  
  wrapper.removeClass('win');
  wrapper.find('.item').removeAttr('style');
  speedometer.text('0');
  flux.html('0<span>%</span>');
  timeMachine.removeClass('get-set').attr('data-lane', '2').empty();
  overlay.attr('class', 'overlay intro');
};


//////////////
// Continue //
//////////////

overlay.find('.continue').on('click', nextStage);

function nextStage() {
  if (stage < 3) stage++;
  else stage = 1;
  
  reset();
  
  overlay.find('.continue span').text(stage + 1);
  hud.find('.stage span').text(stage);
  hud.find('.present span').text(stages[stage - 1]);
  
  wrapper.attr('data-stage', stage);
  wrapper.find('.item.active').removeClass('active');
  wrapper.find('.item[data-stage="' + stage + '"]').addClass('active');
  
  if (stage === 3) {
    overlay.find('.win button')
           .html('Play Again')
           .prev('p')
           .text('You got Marty back to 1985. Thank you for playing.');
  }
  else if (stage === 1) {
    overlay.find('.win button')
           .html('Continue to Stage <span>2</span>')
           .prev('p')
           .text('You got Marty back to 1985.');
  };
};


///////////////////////
// Keyboard Controls //
///////////////////////

doc.keydown(function(e) {
  var currentLane = timeMachine.attr('data-lane');
  
  switch(e.which) {
    case 37: // left
      if (currentLane > 1 && wrapper.hasClass('play')) timeMachine.attr('data-lane', --currentLane);
    break;
    
    case 39: // right
      if (currentLane < 3 && wrapper.hasClass('play')) timeMachine.attr('data-lane', ++currentLane);
    break;
    
    case 13: // enter/return
      if (overlay.is(':visible')) overlay.find('button:visible').trigger('click');
    break;
    
    default: return;
  };
  
  e.preventDefault();
});
            
          
!
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