/* Curl Top Left */
@mixin curl-top-left {
	display: inline-block;
	position: relative;
	
	@include hacks();

	&:before {
		pointer-events: none;
		position: absolute;
		content: '';
		height: 0;
		width: 0;
		top: 0;
		left: 0;
		background: $revealAreaColour; /* IE9 */
		background: linear-gradient(
			135deg, 
			$revealAreaColour 45%,
			$curlLineColour 50%,		
			$curlTransitionColour 56%,		
			$curlLastColour 80%   
		);
		filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr='#ffffff', endColorstr='#000000');/*For IE7-8-9*/

		z-index: 1000;
		box-shadow: 1px 1px 1px rgba(0, 0, 0, .4);
		transition-duration: $defaultDuration;
		transition-property: width, height;
	}

	&:hover:before {
		width: $curlWidth;
		height: $curlHeight;
	}
}