.top-menu > li > a{
	line-height: 2em;
	-webkit-perspective: 1000px;
	perspective: 1000px;
}

.top-menu > li > a > span{
	position: relative;
	display: inline-block;
	transition: -webkit-transform .3s;
	transition: transform .3s;
	transition: transform .3s, -webkit-transform .3s;
	-webkit-transform-origin: 50% 0;
	transform-origin: 50% 0;
	-webkit-transform-style: preserve-3d;
	transform-style: preserve-3d;
}

.top-menu > li > a > span:after{
	position: absolute;
	text-align: center;
	top: 100%;
	left: 0;
	width: 100%;
	height: 100%;
	content: attr(data-hover);
	-webkit-transform: rotateX(-90deg);
	transform: rotateX(-90deg);
	-webkit-transform-origin: 50% 0;
	transform-origin: 50% 0;
	-webkit-backface-visibility: hidden;
	backface-visibility: hidden;
}

.top-menu > li > a:focus > span,
.top-menu > li > a:hover > span{
	-webkit-transform: rotateX(90deg) translateY(-22px);
	transform: rotateX(90deg) translateY(-22px);
}

@media (-webkit-min-device-pixel-ratio: 1.4) {
	.top-menu > li > a > span:after{
		top: 85%;
	}
}

@media (-moz-device-pixel-ratio: 2) {
	.top-menu > li > a > span:after{
		top: 85%;
	}
}