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@import url(http://fonts.googleapis.com/css?family=Raleway:100,900);

$yellow : #FDCD2F;
$cyan : #4EC0B6;
$navy : #3967CB;
$red : #E23942;

$colors : $cyan, $navy, $yellow, $red;
$background: #111;
$chars : 9;
$duration : 8s;
$easing : cubic-bezier(.94,.39,.91,.74);
$easing: ease-out;
$shade : 15%;

// Diagonal clipping 
$left : 0 0 100% 0, 100% 100%;
$right : 0 0, 100% 100%, 0 100%;

// Vertical clipping
// $left : 0 0, 50% 0, 50% 100%, 0 100%;
// $right : 50% 0, 100% 0, 100% 100%, 50% 100%;

@mixin clip($path) {
	-webkit-clip-path: polygon($path);
	clip-path: polygon($path);
}

@mixin color($color) {
	&:before { color: $color; }
	&:after { color: adjust-hue($color, 20deg) }
}


@keyframes flip-top {
	from {
		transform:
			rotate(50deg)
			translateY(120vh);
	}
}

@keyframes flip-bottom {
	from {
		transform:
			rotate(-50deg)
			translateY(120vh);
	}
}


body {
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
	overflow: hidden;
	background: $background;
	animation: glow $duration both;
}


span {
	font: 900 15vw Raleway;
	position: relative;
	display: inline-block;
	perspective: 500px;
	
	&:nth-child(odd) {
		&:before { animation-name: flip-top; }
		&:after { animation-name: flip-bottom; }
	}
	&:nth-child(even) {
		&:before { animation-name: flip-bottom; }
		&:after { animation-name: flip-top; }
	}
	
	
	@for $i from 1 through length($colors) {
		&:nth-child(#{$i}n + #{$i - 1}) {
			@include color(nth($colors, $i));
		}
	}
		
	@for $i from 1 through $chars {
		&:nth-child(#{$i}) {
			&:before {
				$delay : sin($i/$chars) * $duration;
				animation-delay: $delay;
			}
			&:after {
				$delay : sin(($i+.5)/$chars) * $duration;
				animation-delay: $delay;
			}
		}
	}
	
	
	&:before, &:after {
		display: block;
		content: attr(data-text);
		animation: $duration/$chars $easing both;
		animation-name: inherit;
		text-shadow: 0 0 1em;
	}
	&:before {
		@include clip($left);
		position: absolute;
		transform-origin: left center;
		color: nth($colors, 1);
	}
	&:after {
		@include clip($right);
		color: nth($colors, 2);
	}
}
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