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

:root {
	--hue: 3;
	--bg: hsl(var(--hue), 10%, 90%);
	--fg: hsl(var(--hue), 10%, 10%);
	--primary: hsl(var(--hue), 90%, 50%);
	--primaryT: hsla(var(--hue), 90%, 50%, 0);
	--trans-dur: 0.3s;
	font-size: calc(16px + (24 - 16) * (100vw - 320px) / (2560 - 320));
}

body {
	background-color: var(--bg);
	color: var(--fg);
	display: flex;
	font: 1em/1.5 "DM Sans", sans-serif;
	height: 100vh;
	transition:
		background-color var(--trans-dur),
		color var(--trans-dur);
}

a {
	transition: color var(--trans-dur);
}

h1 {
	font-size: 2em;
	margin: 0 0 1.5rem;
	text-align: center;
}

.timeline {
	margin: auto;
	padding: 3em 0;
}

.timeline__items {
	list-style: none;
	margin-left: 0.75em;
}

.timeline__item {
	padding: 0 0 1.5em 1.25em;
	position: relative;
}

.timeline__item br {
	display: none;
}

.timeline__item:before,
.timeline__item:after,
.timeline__item .timeline__item-pub,
.timeline__item .timeline__item-time,
.timeline__item .timeline__item-link {
	transition:
		background-color var(--trans-dur),
		opacity var(--trans-dur) cubic-bezier(0.65, 0, 0.35, 1),
		transform var(--trans-dur) cubic-bezier(0.65, 0, 0.35, 1);
}

.timeline__item:before,
.timeline__item:after {
	background-color: var(--primary);
	content: "";
	display: block;
	position: absolute;
	left: 0;
}

.timeline__item:before {
	border-radius: 50%;
	top: 0.25em;
	width: 1em;
	height: 1em;
	transform: translateX(-50%) scale(0);
	z-index: 1;
}

.timeline__item:after {
	top: 0.75em;
	width: 0.125em;
	height: 100%;
	transform: translateX(-50%);
}

.timeline__item:last-child:after {
	display: none;
}

.timeline__item-pub,
.timeline__item-link,
.timeline__item-time {
	display: block;
	opacity: 0;
	transform: translateX(-0.75em);
}

.timeline__item-link,
.timeline__item-link:visited {
	color: var(--primary);
}

.timeline__item-link {
	transition: color var(--trans-dur);
}

.timeline__item-link:hover {
	text-decoration: underline;
}

.timeline__item-pub,
.timeline__item-time {
	font-size: 0.833em;
	line-height: 1.8;
}

.timeline__item-time {
	font-weight: bold;
}

.timeline__loading {
	text-align: center;
}

/* Observed items */
.timeline__item--in .timeline__item-pub,
.timeline__item--in .timeline__item-link,
.timeline__item--in .timeline__item-time {
	opacity: 1;
	transform: translateX(0);
}

.timeline__item--in:before {
	transform: translateX(-50%) scale(1);
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
	:root {
		--bg: hsl(var(--hue), 10%, 10%);
		--fg: hsl(var(--hue), 10%, 90%);
		--primary: hsl(var(--hue), 90%, 70%);
	}
}

/* Beyond mobile */
@media (min-width: 768px) {
	.timeline__items {
		margin-left: 17em;
		width: 17em;
	}

	.timeline__item-time {
		position: absolute;
		top: 0;
		right: calc(100% + 1.25rem);
		text-align: right;
		width: 17rem;
		transform: translateX(0.75em);
	}
}