* {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

:root {
	--hue: 223;
	--bg: hsl(var(--hue), 90%, 90%);
	--fg: hsl(var(--hue), 90%, 10%);
	--primary: hsl(var(--hue), 90%, 50%);
	--trans-dur: 0.3s;
	font-size: calc(16px + (32 - 16) * (100vw - 320px) / (2560 - 320));
}

body {
	background-color: var(--bg);
	color: var(--fg);
	display: flex;
	justify-content: center;
	align-items: center;
	font: 1em/1.5 sans-serif;
	height: 100vh;
	transition:
		background-color var(--trans-dur),
		color var(--trans-dur);
}

.container {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	width: 100%;
	height: 100%;
}

.message {
	height: 1.5em;
	position: relative;
	text-align: center;
}

.bike {
	display: block;
	margin: auto;
	width: 16em;
	height: auto;
}

.bike__body,
.bike__front,
.bike__handlebars,
.bike__pedals,
.bike__pedals-spin,
.bike__seat,
.bike__spokes,
.bike__spokes-spin,
.bike__tire {
	animation: bikeBody 3s ease-in-out infinite;
	stroke: var(--primary);
	transition: stroke var(--trans-dur);
}

.bike__front {
	animation-name: bikeFront;
}

.bike__handlebars {
	animation-name: bikeHandlebars;
}

.bike__pedals {
	animation-name: bikePedals;
}

.bike__pedals-spin {
	animation-name: bikePedalsSpin;
}

.bike__seat {
	animation-name: bikeSeat;
}

.bike__spokes,
.bike__tire {
	stroke: currentColor;
}

.bike__spokes {
	animation-name: bikeSpokes;
}

.bike__spokes-spin {
	animation-name: bikeSpokesSpin;
}

.bike__tire {
	animation-name: bikeTire;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
	:root {
		--bg: hsl(var(--hue), 90%, 10%);
		--fg: hsl(var(--hue), 90%, 90%);
	}
}

/* Animations */
@keyframes bikeBody {
	from {
		stroke-dashoffset: 79;
	}

	33%,
	67% {
		stroke-dashoffset: 0;
	}

	to {
		stroke-dashoffset: -79;
	}
}

@keyframes bikeFront {
	from {
		stroke-dashoffset: 19;
	}

	33%,
	67% {
		stroke-dashoffset: 0;
	}

	to {
		stroke-dashoffset: -19;
	}
}

@keyframes bikeHandlebars {
	from {
		stroke-dashoffset: 10;
	}

	33%,
	67% {
		stroke-dashoffset: 0;
	}

	to {
		stroke-dashoffset: -10;
	}
}

@keyframes bikePedals {
	from {
		animation-timing-function: ease-in;
		stroke-dashoffset: -25.133;
	}

	33%,
	67% {
		animation-timing-function: ease-out;
		stroke-dashoffset: -21.991;
	}

	to {
		stroke-dashoffset: -25.133;
	}
}

@keyframes bikePedalsSpin {
	from {
		transform: rotate(0.1875turn);
	}

	to {
		transform: rotate(3.1875turn);
	}
}

@keyframes bikeSeat {
	from {
		stroke-dashoffset: 5;
	}

	33%,
	67% {
		stroke-dashoffset: 0;
	}

	to {
		stroke-dashoffset: -5;
	}
}

@keyframes bikeSpokes {
	from {
		animation-timing-function: ease-in;
		stroke-dashoffset: -31.416;
	}

	33%,
	67% {
		animation-timing-function: ease-out;
		stroke-dashoffset: -23.562;
	}

	to {
		stroke-dashoffset: -31.416;
	}
}

@keyframes bikeSpokesSpin {
	from {
		transform: rotate(0);
	}

	to {
		transform: rotate(3turn);
	}
}

@keyframes bikeTire {
	from {
		animation-timing-function: ease-in;
		stroke-dashoffset: 56.549;
		transform: rotate(0);
	}

	33% {
		stroke-dashoffset: 0;
		transform: rotate(0.33turn);
	}

	67% {
		animation-timing-function: ease-out;
		stroke-dashoffset: 0;
		transform: rotate(0.67turn);
	}

	to {
		stroke-dashoffset: -56.549;
		transform: rotate(1turn);
	}
}