:root {
	font-size: calc(16px + (20 - 16) * (100vw - 320px)/(980 - 320));
	--rotateTimes: 0;
}

nav,
ul,
li {
	transform-style: preserve-3d;
}

nav,
li {
	position: absolute;
	top: 30%;
	left: 50%;
}

nav,
li a {
	border-radius: 50%;
}

nav {
	width: 100em;
	height: 70em;
	transform: translate(-50%, -50%) rotateX(75deg);
	position: relative;
}

ul,
li a {
	width: 100%;
	height: 100%;
}

ul {
	list-style: none;
}

li {
	animation: idle 4s ease-in-out infinite;
	text-align: center;
	width: 15em;
	height: 15em;
	transform: translate(-50%, -50%);
}

li a {
	box-shadow: 0 0 0 0.1em #0cf inset, 0 0 1em #0cf inset;
	color: currentColor;
	display: inline-block;
	text-decoration: none;
	transition: transform 0.4s linear, box-shadow 0.15s linear, margin 0.1s linear, width 0.1s linear, height 0.1s linear;
}

li a span {
	transition: color 0.15s linear;
}

li a:before {
	background-color: #fff;
	border-radius: 50%;
	content: "";
	display: block;
	opacity: 0.5;
	position: absolute;
	top: 2.75em;
	left: 3.75em;
	width: 1em;
	height: 0.5em;
	transform: rotate(-45deg);
}

li a:focus,
li a.current {
	box-shadow: 0 0 0 0.1em #ff0 inset, 0 0 1em #ff0 inset;
	outline: 0;
}

li a:focus span,
li a.current span {
	color: #ff0;
}

li a:hover {
	margin: -5% 0 0 -5%;
	width: 110%;
	height: 110%;
	box-shadow: 0 0 0 0.1em #ff0 inset, 0 0 1em #ff0 inset;
}

li a:hover svg {
	width: 3em;
	height: 3em;
}

@media (prefers-reduced-motion) {
	li {
		animation: none;
	}
}

svg {
	display: block;
	margin: 1.25em auto 1.5em auto;
	transition: width 0.1s linear, height 0.1s linear;
	width: 2.5em;
	height: 2.5em;
}

/* Position bubbles */
li:nth-of-type(1) {
	animation-delay: 0s;
}

li:nth-of-type(1) a {
	transform: rotate(calc(0deg + var(--rotateTimes) * 51.4285714286deg)) translateY(9em) rotate(calc(0deg - var(--rotateTimes) * 51.4285714286deg)) rotateX(-75deg);
}

li:nth-of-type(2) {
	animation-delay: -0.5s;
}

li:nth-of-type(2) a {
	transform: rotate(calc(-51.4285714286deg + var(--rotateTimes) * 51.4285714286deg)) translateY(9em) rotate(calc(51.4285714286deg - var(--rotateTimes) * 51.4285714286deg)) rotateX(-75deg);
}

li:nth-of-type(3) {
	animation-delay: -1s;
}

li:nth-of-type(3) a {
	transform: rotate(calc(-102.8571428571deg + var(--rotateTimes) * 51.4285714286deg)) translateY(9em) rotate(calc(102.8571428571deg - var(--rotateTimes) * 51.4285714286deg)) rotateX(-75deg);
}

li:nth-of-type(4) {
	animation-delay: -1.5s;
}

li:nth-of-type(4) a {
	transform: rotate(calc(-154.2857142857deg + var(--rotateTimes) * 51.4285714286deg)) translateY(9em) rotate(calc(154.2857142857deg - var(--rotateTimes) * 51.4285714286deg)) rotateX(-75deg);
}

li:nth-of-type(5) {
	animation-delay: -2s;
}

li:nth-of-type(5) a {
	transform: rotate(calc(-205.7142857143deg + var(--rotateTimes) * 51.4285714286deg)) translateY(9em) rotate(calc(205.7142857143deg - var(--rotateTimes) * 51.4285714286deg)) rotateX(-75deg);
}

/* Animations */
.rise {
	animation: rise 1s ease-out;
}

.rise a {
	animation: fadeOut 1s ease-out;
}

.rise a.pop {
	animation: pop 1s linear;
}

.rise a.pop svg,
.rise a.pop span {
	visibility: hidden;
}

@keyframes rise {
	from {
		transform: translateZ(0);
	}

	15% {
		transform: translateZ(-1em);
	}

	to {
		transform: translateZ(35em);
	}
}

@keyframes fadeOut {

	from,
	15% {
		opacity: 1;
	}

	50%,
	to {
		opacity: 0;
	}
}

@keyframes pop {
	from {
		margin: -5% 0 0 -5%;
		width: 110%;
		height: 110%;
		opacity: 1;
	}

	10%,
	to {
		margin: -20% 0 0 -20%;
		width: 140%;
		height: 140%;
		opacity: 0;
	}
}

@keyframes idle {

	from,
	to {
		transform: translate(-50%, -48%);
	}

	25% {
		transform: translate(-52%, -50%);
	}

	50% {
		transform: translate(-50%, -52%);
	}

	75% {
		transform: translate(-48%, -50%);
	}
}