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              <div class="wrapper">

	<ul id="index" data-level="1" data-color="white">
		<li class="blue" data-link="#section-1">1</li>
		<li class="green" data-link="#section-2">2</li>
		<li class="yellow" data-link="#section-3">3</li>
	</ul>

		<ul id="section-1" data-level="2" data-color="blue">
			<li data-link="#section-1-1">1.1</li>
			<li data-link="#section-1-1">1.2</li>
			<li data-link="#section-1-1">1.3</li>
			<li data-link="#section-1-1">1.4</li>
			<li data-link="#section-1-1">1.5</li>
			<li data-link="#section-1-1">1.6</li>
			<li data-link="#section-1-1">1.7</li>
			<li data-link="#section-1-1">1.8</li>
			<li data-link="#section-1-1">1.9</li>
			<li data-link="#section-1-1">1.10</li>
			<li data-link="#section-1-1">1.11</li>
			<li data-link="#section-1-1">1.12</li>
			<li data-link="#section-1-1">1.13</li>
			<li data-link="#section-1-1">1.14</li>
			<li class="back" data-link="#index">back</li>
		</ul>

			<ul id="section-1-1" data-level="3" data-color="white">
				<li class="content blue">1.1 - 1.14 content</li>
				<li class="back" data-link="#section-1">back</li>
			</ul>

		<ul id="section-2" data-level="2" data-color="green">
			<li data-link="#section-2-1">2.1</li>
			<li data-link="#section-2-2">2.2</li>
			<li data-link="#section-2-3">2.3</li>
			<li class="back" data-link="#index">back</li>
		</ul>

			<ul id="section-2-1" data-level="3" data-color="white">
				<li class="content green">2.1 content</li>
				<li class="back" data-link="#section-2">back</li>
			</ul>

			<ul id="section-2-2" data-level="3" data-color="white">
				<li class="content green">2.2 content</li>
				<li class="back" data-link="#section-2">back</li>
			</ul>

			<ul id="section-2-3" data-level="3" data-color="white">
				<li class="content green">2.3 content</li>
				<li class="back" data-link="#section-2">back</li>
			</ul>

		<ul id="section-3" data-level="2" data-color="yellow">
			<li class="orange" data-link="#section-3-1">3.1</li>
			<li class="red" data-link="#section-3-2">3.2</li>
			<li class="pink" data-link="#section-3-3">3.3</li>
			<li class="violet" data-link="#section-3-4">3.4</li>
			<li class="back" data-link="#index">back</li>
		</ul>

			<ul id="section-3-1" data-level="3" data-color="orange">
				<li data-link="#section-3-1-1">3.1.1</li>
				<li data-link="#section-3-1-1">3.1.2</li>
				<li data-link="#section-3-1-1">3.1.3</li>
				<li class="back" data-link="#section-3">back</li>
			</ul>

				<ul id="section-3-1-1" data-level="4" data-color="white">
					<li class="content orange">3.1.1 - 3.1.3 content</li>
					<li class="back" data-link="#section-3-1">back</li>
				</ul>

			<ul id="section-3-2" data-level="3" data-color="red">
				<li class="content white">3.2 content</li>
				<li class="back" data-link="#section-3">back</li>
			</ul>

			<ul id="section-3-3" data-level="3" data-color="pink">
				<li data-link="#section-3-3-1">3.3.1</li>
				<li data-link="#section-3-3-2">3.3.2</li>
				<li data-link="#section-3-3-3">3.3.3</li>
				<li data-link="#section-3-3-4">3.3.4</li>
				<li class="back" data-link="#section-3">back</li>
			</ul>

				<ul id="section-3-3-1" data-level="4" data-color="white">
					<li class="content pink">3.3.1 content</li>
					<li class="back" data-link="#section-3-3">back</li>
				</ul>

				<ul id="section-3-3-2" data-level="4" data-color="white">
					<li class="content pink">3.3.2 content</li>
					<li class="back" data-link="#section-3-3">back</li>
				</ul>

				<ul id="section-3-3-3" data-level="4" data-color="white">
					<li class="content pink">3.3.3 content</li>
					<li class="back" data-link="#section-3-3">back</li>
				</ul>

				<ul id="section-3-3-4" data-level="4" data-color="white">
					<li class="content pink">3.3.4 content</li>
					<li class="back" data-link="#section-3-3">back</li>
				</ul>

			<ul id="section-3-4" data-level="3" data-color="violet">
				<li class="content white">3.4 content</li>
				<li class="back" data-link="#section-3">back</li>
			</ul>

</div>
            
          
!
            
              
@import url(https://fonts.googleapis.com/css?family=Roboto+Slab:400,700);

body {
	margin: 50px;
	padding: 0;
	background: #fff;
	color: #000;
	font-family: 'Roboto Slab', serif;
	font-weight: 700;
	font-size: 32px;
	line-height: 32px;
	text-transform: uppercase;
}

.wrapper {
	position: relative;
	display: inline-block;
}

ul {
	display: inline-block;
	margin: 0;
	padding: 0;
	list-style-type: none;
	max-width: 1100px;
}

li {
	display: block;
	box-sizing: border-box;
	float: left;
	width: 200px;
	height: 200px;
	padding: 20px;
	margin: 10px;
	background: #fff;
	cursor: pointer;
	overflow: hidden;
}

p {
	font-size: 16px;
	font-weight: 400;
	line-height: 18px;
}

.content {
	width: 640px;
	height: 420px;
	cursor: default;
}

.back {
	background: none;
}

.hidden {
	display: none;
}

.no-overflow {
	overflow: hidden;
}

.white {
	background: #fff;
}

.red {
	background: #e3181a;
}

.orange {
	background: #f4a400;
}

.yellow {
	background: #f2ea00;
}

.green {
	background: #9fca2d;
}

.cyan {
	background: #7cc6a4;
}

.blue {
	background: #58b9ec;
}

.violet {
	background: #8551a2;
}

.pink {
	background: #e2137a;
}

            
          
!
            
              $(document).ready(function(){

	// hide all except for the base group
	$('ul').each(function(){
		if($(this).attr('data-level')>1){
			$(this).addClass('hidden');
		}
	});

	//vars
	var currentgroup;
	var selectedgroup;
	var colorgroup;
	var xy = [];
	var sc = [];

	// box actions
	$('li').on('click', function(){

		// don't do anything if no data-link provided
		if($(this).attr('data-link') == null){
			return false;
		}

		currentgroup = $(this).parent();
		selectedgroup = $($(this).attr('data-link'));
		colorgroup = selectedgroup.attr('data-color');
		xy[currentgroup.attr('data-level')] = ($(this).position().left + $(this).outerWidth(true)/2) + 'px ' + ($(this).position().top + $(this).outerHeight(true)/2) + 'px'; // center of the box in an array for proper transform-origins for each level clicked
		sc[currentgroup.attr('data-level')] = $(window).scrollTop(); // scroll position for each level, used for the back button

		$('body').addClass('no-overflow');

		if(!$(this).hasClass('back')) {

			// going forward
			$('.wrapper')
				.css({'transform-origin': xy[currentgroup.attr('data-level')]})
				.animate({'transform': 'scale(25, 25)'}, 500, 'Power4.easeIn', function (){
					currentgroup.addClass('hidden');
					selectedgroup.removeClass('hidden');					
					$('body')
						.attr('class', 'no-overflow ' + colorgroup)
						.animate({'scrollTop': '0px'}, 500, 'Power4.easeOut');
					$('.wrapper')
						.animate({'transform': 'scale(0, 0)'}, 0)
						.animate({'transform': 'scale(1, 1)'}, 500, 'Power4.easeOut', function(){
							$('body').removeClass('no-overflow');
						});
				});

		} else {

			// and backwards
			$('.wrapper')
				.css({'transform-origin': xy[currentgroup.attr('data-level')-1]})
				.animate({'transform': 'scale(0, 0)'}, 600, 'Power4.easeIn', function (){
					currentgroup.addClass('hidden');
					selectedgroup.removeClass('hidden');
					$('body')
						.attr('class', 'no-overflow ' + colorgroup)
						.animate({'scrollTop': sc[currentgroup.attr('data-level')-1]}, 500, 'Power4.easeOut');
					$('.wrapper')
						.animate({'transform': 'scale(25, 25)'}, 0)
						.animate({'transform': 'scale(1, 1)'}, 500, 'Power4.easeOut', function(){ 
							$('body').removeClass('no-overflow');
						});
				});

		}
		
	});

	// fill in content boxes with some random text
	var cnt = [
		'Lorem ipsum dolor sit amet, consectetur adipiscing elit',
		'Suspendisse sollicitudin vel nibh id vestibulum',
		'Maecenas gravida felis in ante hendrerit molestie',
		'Mauris quis tortor neque',
		'Aliquam erat volutpat',
		'Nulla hendrerit egestas metus id dictum',
		'Nunc cursus dolor enim, et molestie eros sagittis sit amet',
		'Sed pretium felis ut erat hendrerit eget venenatis libero euismod',
		'Fusce quis lorem risus',
		'Mauris mattis mauris sit amet neque laoreet malesuada',
		'Praesent at lectus sapien',
		'Quisque eget augue mauris'];

	$('li:not(.back)').each(function(){
		$(this).append('<p>'+ cnt[Math.floor(Math.random()*cnt.length)] +'</p>');
	});

});
            
          
!
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