/* GLASS */
.glass {
	position: relative;
	width: 40vmin;
	outline: none;
	cursor: pointer;
	user-select: none;
	-webkit-user-select: none;
	-webkit-tap-highlight-color: rgba(0,0,0,0);
}

.glass svg {
	position: relative;
	z-index: 1;
	display: block;
	transform: translateZ(100vmin);
}

.glass .wrapper {
	position: absolute;
	left: 10.5%;
	right: 10.5%;
	top: 5%;
	bottom: -15%;
	transform: perspective(96vmin) rotateX(-30.8deg);
}

.glass .contents {
	position: absolute;
	left: 0;
	right: 0;
	top: 0;
	bottom: 0;
	border-radius: 0 0 25% 25% / 0 0 10% 10%;
	overflow: hidden;
}


/* BEER */
.glass .beer {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 0;
	background-size: 100% 100%;
	animation-name: fill;
	background-image: url('../images/beer.png');
	/* Had to use an image for the gradient because css linear gradients don't create a smooth enough ramp between stops for my liking. */
}

.glass .surface {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 100%;
	transform: scale(0);
	opacity: 1;
	animation-name: surface;
}

.glass .surface::before {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	padding-bottom: 15%;
	margin-top: -5%;
	border-radius: 50%;
	background: #000;
	opacity: 0.35;
}

.glass .surface::after {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	padding-bottom: 15%;
	margin-top: -7.5%;
	border-radius: 50%;
	background: #d39909;
}

@keyframes fill {
	0% {
		height: 0%;
	}
	100% {
		height: 89%;
	}
}

@keyframes surface {
	0% {
		transform: scale(0);
		opacity: 0;
	}
	10%, 100% {
		transform: scale(1);
		opacity: 1;
	}
}


/* BUBBLES */
.glass .bubbles {
	position: absolute;
	left: 0;
	right: 0;
	top: 0;
	bottom: 0;
	overflow: hidden;
}

.glass .bubbles .layer {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 10%;
	padding-bottom: 200%;
	background-size: 100% auto;
	background-image: url('../images/bubbles.png');
	background-repeat: repeat-y;
	-webkit-mask-image: linear-gradient(to top, transparent 20%, black 100%);
	animation-name: bubbly;
	animation-duration: 3s;
	animation-timing-function: linear;
	animation-iteration-count: infinite;
}

.glass .bubbles .layer.more {
	transform: rotate(180deg);
	-webkit-mask-image: linear-gradient(to bottom, transparent 40%, black 100%);
	animation-direction: reverse;
	animation-duration: 3.5s;
	opacity: 0.65;
}

@keyframes bubbly {
	from {
		background-position-y: 100%
	}
}


/* HEAD */
.glass .head {
	position: absolute;
	z-index: 1;
	left: 0;
	right: 0;
	bottom: 100%;
	padding-bottom: 0%;
	opacity: 0;
	animation-name: fill-head;
	background: linear-gradient(to right, rgba(178,178,178,1) 0%,rgba(235,235,235,1) 50%,rgba(178,178,178,1) 100%);
}

.glass .head::before {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	padding-bottom: 15%;
	border-radius: 50%;
	margin-bottom: -7.5%;
	background: linear-gradient(to right, rgba(178,178,178,1) 0%,rgba(235,235,235,1) 50%,rgba(178,178,178,1) 100%);
}

.glass .head::after {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	top: 0;
	padding-bottom: 15%;
	margin-top: -7.5%;
	border-radius: 50%;
	background: #f4f4f4;
}

@keyframes fill-head {
	0% {
		padding-bottom: 0%;
		opacity: 0;
	}
	35% {
		padding-bottom: 0%;
		opacity: 0;
	}
	45% {
		opacity: 1;
	}
	100% {
		opacity: 1;
		padding-bottom: 20.5%;
	}
}


/* POUR */

.pour {
	position: absolute;
	z-index: 2;
	left: 50%;
	bottom: 0;
	width: 0;
	opacity: 0;
	height: 200%;
	transform: translateX(-50%);
	animation-name: pour-position;
	transition: 200ms;
}

.pour .stream {
	content: "";
	position: absolute;
	left: 50%;
	right: 0;
	top: 0;
	bottom: 0;
	transform: translateX(-50%);
	background: linear-gradient(to bottom, rgba(211,153,9,0) 0%,rgba(211,153,9,1) 20%,rgba(211,153,9,1) 100%);
	animation-name: pour-opacity;
}

.pour .stream::before {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	padding-bottom: 25%;
	border-radius: 50%;
	background: #d39909;
	transform: translateY(50%);
}

@keyframes pour-position {
	0% {
		bottom: 0;
		margin-bottom: 0%;
		height: 200%;
	}
	35% {
		margin-bottom: 0%;
	}
	100% {
		bottom: 89%;
		margin-bottom: 20.5%;
		height: 50%;
	}
}

@keyframes pour-opacity {
	0%,96% {
		opacity: 1;
		width: 100%;
	}
	100% {
		opacity: 0;
		width: 0;
	}
}


/* INSTRUCTIONS */
.instructions {
visibility: hidden;
}

@media (pointer: fine) {
	.instructions::before {
		content: "Click ";
	}
}

@media (pointer: coarse) {
	.instructions::before {
		content: "Tap ";
	}
}

@keyframes instructions {
	0%, 15% {
		opacity: 0.5;
	}
	20%, 100% {
		opacity: 0;
	}
}


/* DEFINE ANIMATION */

.glass .beer,
.glass .head,
.glass .surface,
.glass .pour,
.glass .pour .stream,
.instructions {
	animation-timing-function: cubic-bezier(.2,0,.4,1);
	animation-duration: 4s;
	animation-fill-mode: forwards;
	animation-play-state: paused;
}


/* ANIMATE FILL */
@media (pointer: fine) {
	.glass:active .beer,
	.glass:active .head,
	.glass:active .surface,
	.glass:active .pour,
	.glass:active .pour .stream,
	.glass:active ~ .instructions {
		animation-play-state: running;
	}
	
	.glass:active .pour {
		width: 10%;
		opacity: 1;
	}
}

@media (pointer: coarse) {
	.glass:hover .beer,
	.glass:hover .head,
	.glass:hover .surface,
	.glass:hover .pour,
	.glass:hover .pour .stream,
	.glass:hover ~ .instructions {
		animation-play-state: running;
	}
	
	.glass:hover .pour {
		width: 10%;
		opacity: 1;
	}
}