* {
	box-sizing: border-box;
}

body {
	background-color: #fee1e1;
}

$outerYearSpacing: 35px;
$cardWidth: 655px;
$cardHeight: 342px;
.wrapper {
	position: absolute;
	margin: (-$cardHeight/2) 0 0 (-$cardWidth/2);
	left: 50%;
	top: 50%;
	height: $cardHeight;
	width: $cardWidth;
}

.card {
	background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/279756/2017_bg.png);
	background-size: cover;
	width: $cardWidth;
	height: $cardHeight;
	border-radius: 5px;
	position: absolute;
	box-shadow: -20px 30px 116px 0 rgba(92, 15, 15, 0.54);
	overflow: hidden;
	z-index: 4;
	&__orangeShine,
	&__greenShine {
		position: absolute;
		background-repeat: no-repeat;
		background-size: cover;
	}
	&__orangeShine {
		background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/279756/orange_shine.png);
		right: -150px;
		top: -90px;
		bottom: 50px;
		z-index: 2;
		width: 570px;
		height: 500px;
	}
	&__greenShine {
		background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/279756/green_shine.png);
		left: 20%;
		top: 0;
		bottom: 0;
		z-index: 1;
		width: 400px;
	}
	&__year {
		font-family: 'Oswald', sans-serif;
		text-align: center;
		color: #fff;
		font-size: 110px;
		line-height: 110px;
		padding: 55px 0;
		font-weight: 100;
		position: relative;
		z-index: 2;
	}
	&__thankyou {
		font-family: 'Oswald', sans-serif;
		position: absolute;
		text-transform: uppercase;
		font-weight: 100;
		left: 33%;
		bottom: 20%;
		z-index: 2;
		color: #fff;
		letter-spacing: 5px;
		line-height: 17px;
		font-size: 12px;
		color: rgba(255, 255, 255, 0.5);
	}
	&__circle,
	&__smallCircle {
		position: absolute;
		border-radius: 100%;
		background-image: linear-gradient(-239deg, #3B4576 0%, #242A48 59%);
		box-shadow: -10px -15px 90px 0 #191C41;
		z-index: 2;
	}
	&__circle {
		right: 68px;
		bottom: 34px;
		width: 230px;
		height: 230px;
	}
	&__smallCircle {
		right: 40%;
		top: -7%;
		width: 50px;
		height: 50px;
	}
	&__outer-year {
		font-family: 'Orbitron';
		span {
			position: absolute;
			color: #fff;
			font-size: 16px;
			z-index: 4;
			&:nth-child(1),
			&:nth-child(4) {
				&:after {
					content: '';
					position: absolute;
					bottom: -2px;
					left: 0;
					width: 100%;
					border-bottom: 2px solid #fff;
				}
			}
			&:nth-child(1) {
				top: $outerYearSpacing;
				left: $outerYearSpacing;
			}
			&:nth-child(2) {
				left: none;
				top: $outerYearSpacing;
				right: $outerYearSpacing;
			}
			&:nth-child(3) {
				top: none;
				bottom: $outerYearSpacing;
				left: $outerYearSpacing;
			}
			&:nth-child(4) {
				top: none;
				left: none;
				right: $outerYearSpacing;
				bottom: $outerYearSpacing;
			}
		}
	}
	&__comet {
		position: relative;
		width: 8px;
		height: 8px;
		background-color: #fff;
		border-radius: 100%;
		&Outer {
			position: absolute;
			top: 30%;
			left: 25%;
		}
		&--second {
			right: -30px;
			top: -15px;
			transform: scale(0.6)
		}
		&:before,
		&:after {
			content: '';
			position: absolute;
			left: 0;
			top: 0;
			background: linear-gradient(to bottom, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.2) 27%, rgba(255, 255, 255, 0) 100%);
			border-radius: 20px;
			transform: rotate(-45deg);
		}
		&:before {
			width: 18px;
			height: 70px;
			transform-origin: -2px 13px;
		}
		&:after {
			width: 12px;
			height: 80px;
			transform-origin: 0px 8px;
		}
	}
}

.source {
	position: absolute;
	width: 100%;
	left: 0;
	bottom: -30px;
	opacity: 0.5;
	font-size: 12px;
	a {
		color: #000;
	}
}

const $circle = document.querySelector('.card__circle');
const $smallCircle = document.querySelector('.card__smallCircle');
const $year = document.querySelector('.card__year');
const $card = document.querySelector('.card');
const $cardOrangeShine = document.querySelector('.card__orangeShine');
const $cardThankYou = document.querySelector('.card__thankyou');
const $cardComet = document.querySelector('.card__cometOuter');

const generateTranslate = (el, e, value) => {
	el.style.transform = `translate(${e.clientX*value}px, ${e.clientY*value}px)`;
}
// http://stackoverflow.com/a/1480137
const cumulativeOffset = (element) => {
    var top = 0, left = 0;
    do {
        top += element.offsetTop  || 0;
        left += element.offsetLeft || 0;
        element = element.offsetParent;
    } while(element);

    return {
        top: top,
        left: left
    };
};
document.onmousemove = (event) => {
	const e = event || window.event;
	const x = (e.pageX - cumulativeOffset($card).left - (350 / 2)) * -1 / 100;
	const y = (e.pageY - cumulativeOffset($card).top - (350 / 2)) * -1 / 100;

	const matrix = [
		[1, 0, 0, -x * 0.00005],
		[0, 1, 0, -y * 0.00005],
		[0, 0, 1, 1],
		[0, 0, 0, 1]
	];

	generateTranslate($smallCircle, e, 0.03);
	generateTranslate($cardThankYou, e, 0.03);
	generateTranslate($cardOrangeShine, e, 0.09);
	generateTranslate($circle, e, 0.05);
	generateTranslate($year, e, 0.03);
	generateTranslate($cardComet, e, 0.05);

	$card.style.transform = `matrix3d(${matrix.toString()})`;
}