:root {
	--rail-w: 64px;
}
html {
	scroll-behavior: smooth;
}
body {
	min-height: 100vh;
}

/* --- Signet (formrausch Logo) über der Rail --- */
.signet {
	position: fixed;
	top: 1.4rem;
	left: calc(var(--rail-w) / 2);
	width: 14px;
	height: auto;
	z-index: 6;
	line-height: 0;
	display: block;
	color: var(--text);
	opacity: 0.85;
	transform: translateX(-50%);
	transition: opacity 0.15s ease, transform 0.15s ease;
	view-transition-name: chrome-signet;
}
.signet img {
	width: 100%;
	height: auto;
	display: block;
}
.signet:hover {
	opacity: 1;
	transform: translateX(-50%) translateY(-1px);
}

/* --- Rail (Timeline mit Playhead) --- */
.rail {
	position: fixed;
	top: 0;
	left: 0;
	bottom: 0;
	width: var(--rail-w);
	padding: 5rem 0 3.5rem;
	display: flex;
	justify-content: center;
	border-right: 1px solid var(--line);
	background: var(--ink);
	cursor: pointer;
	z-index: 3;
	view-transition-name: chrome-rail;
}
.rail:hover .track {
	opacity: 0.45;
}
.rail .track {
	transition: opacity 0.15s ease;
}
.rail .track {
	position: relative;
	width: 2px;
	height: 100%;
	border-radius: 4px;
	background: var(--spectrum);
	opacity: 0.28;
}
.rail .fill {
	position: absolute;
	left: 0;
	right: 0;
	top: 0;
	border-radius: 4px;
	background: var(--spectrum);
}
.rail .playhead {
	position: absolute;
	left: 50%;
	width: 14px;
	height: 14px;
	transform: translate(-50%, -50%);
	border-radius: 999px;
	background: var(--warm);
	box-shadow:
		0 0 0 4px color-mix(in oklab, var(--warm) 20%, transparent),
		0 0 24px color-mix(in oklab, var(--warm) 60%, transparent);
	view-transition-name: playhead;
}
/* Vertikales Brand-Label am rechten Viewport-Rand */
.edge-brand {
	position: fixed;
	top: 50%;
	right: 1.25rem;
	transform: translateY(-50%);
	writing-mode: sideways-lr;
	color: color-mix(in oklab, var(--faint) 75%, transparent);
	font-family: var(--f-mono);
	font-size: 0.7rem;
	letter-spacing: 0.32em;
	text-transform: uppercase;
	white-space: nowrap;
	pointer-events: none;
	z-index: 4;
	view-transition-name: chrome-edge-brand;
}
.rail .rail-total {
	position: absolute;
	bottom: 1rem;
	left: 50%;
	transform: translateX(-50%);
	color: var(--faint);
	font-family: var(--f-mono);
	font-size: 0.78rem;
	letter-spacing: 0.05em;
	view-transition-name: chrome-rail-total;
}

/* --- Stage / Slides --- */
.stage {
	position: relative;
	padding: clamp(2rem, 5vw, 4rem) clamp(2rem, 6vw, 5rem);
	padding-left: max(clamp(2rem, 6vw, 5rem), calc(var(--rail-w) + 1rem));
}

.hud {
	position: fixed;
	top: 1.5rem;
	right: 2rem;
	z-index: 5;
	display: flex;
	gap: 0.55rem;
	align-items: baseline;
	font-family: var(--f-mono);
	letter-spacing: 0.05em;
	view-transition-name: chrome-hud;
}
.hud .count {
	font-size: 1.5rem;
	font-weight: 600;
	color: var(--text);
}
.hud .sep {
	color: var(--faint);
	font-size: 1.1rem;
}
.hud .total {
	color: var(--faint);
	font-size: 1.1rem;
}
.hud .brand {
	display: none;
} /* Brand sitzt jetzt auf dem Rail */

.slide {
	display: none;
	flex-direction: column;
	gap: 1.25rem;
	max-width: 1240px;
	margin-inline: auto;
	width: 100%;
	min-height: calc(100vh - 8rem);
	padding-top: clamp(2rem, 6vh, 5rem);
	padding-bottom: 6rem; /* platz für die fixed Nav-Buttons unten */
}
.slide.active {
	display: flex;
}
/* Kinder behalten ihre natürliche Höhe — kein Squeezen durch Flex-Geschwister */
.slide > * {
	flex: 0 0 auto;
}

/* Intro slide bekommt zusätzlichen Luftraum */
.slide.intro,
.slide.section-cover {
	gap: 2rem;
	justify-content: center;
	padding-block: 0;
}
/* Section-Cover: die beiden Wörter tauschen ihre Farbe im Loop. */
.slide.section-cover {
	--cover-tint: var(--cyan); /* Default für Sektion I */
}
.slide.section-cover.cover-violet {
	--cover-tint: var(--violet);
}
.slide.section-cover.cover-coral {
	--cover-tint: var(--coral);
}
.slide.section-cover .title > span {
	animation: cover-word-swap 5s cubic-bezier(0.83, 0, 0.17, 1) infinite;
}
.slide.section-cover .title > span:nth-of-type(2) {
	animation-delay: -2.5s; /* halber Zyklus offset → invertierte Phase */
}
@keyframes cover-word-swap {
	0%,
	30% {
		color: var(--text);
	}
	50%,
	80% {
		color: var(--cover-tint);
	}
	100% {
		color: var(--text);
	}
}
@media (prefers-reduced-motion: reduce) {
	.slide.section-cover .title > span {
		animation: none;
	}
	.slide.section-cover .title > span:nth-of-type(2) {
		color: var(--cover-tint);
	}
}

.overline {
	display: inline-flex;
	align-items: center;
	gap: 0.85rem;
	font-family: var(--f-mono);
	font-size: 0.78rem;
	letter-spacing: 0.24em;
	text-transform: uppercase;
	color: var(--dim);
	margin-bottom: 0.25rem;
}
.overline::before {
	content: "";
	width: 36px;
	height: 1px;
	background: var(--spectrum-h);
	display: inline-block;
}
.overline .year {
	color: var(--faint);
	letter-spacing: 0.18em;
}

.slide h1.title {
	font-size: clamp(2.8rem, 9vw, 8rem);
	font-weight: 800;
	line-height: 0.95;
	margin: 0;
}
.slide h2 {
	font-size: clamp(1.8rem, 4vw, 3.2rem);
	font-weight: 800;
	line-height: 1;
	letter-spacing: -0.03em;
	margin: 0 0 0.25em;
}
.slide h2 .accent {
	color: var(--cyan);
}
.slide h2 .violet {
	color: var(--violet);
}
.slide h2 .coral {
	color: var(--coral);
}

.spectrum {
	background: var(--spectrum-h);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
	-webkit-text-fill-color: transparent;
}

.slide p {
	max-width: 70ch;
	margin: 0;
}
.slide ul {
	max-width: 70ch;
	padding-left: 1.2em;
	margin: 0;
	color: var(--dim);
	font-size: clamp(1.1rem, 1.55vw, 1.35rem);
	line-height: 1.55;
}
.slide li {
	margin-bottom: 0.55em;
}
.slide li strong {
	color: var(--text);
}

.slide .lead {
	color: var(--dim);
	font-size: clamp(1.1rem, 1.55vw, 1.35rem);
	line-height: 1.55;
	max-width: 70ch;
}
.slide .lead code {
	color: var(--text);
	background: var(--ink-2);
	padding: 0.05em 0.35em;
	border-radius: 4px;
	font-size: 0.92em;
}

/* --- Tag Row (Intro-Slide) --- */
.slide .tags {
	display: flex;
	gap: 0.6rem;
	flex-wrap: wrap;
	margin-top: 0.25rem;
}
.slide .tags .badge {
	padding: 0.65rem 1.25rem;
	font-size: 0.82rem;
	letter-spacing: 0.02em;
	border-radius: 999px;
	border-width: 1.5px;
	border-style: solid;
	background: transparent;
}
.slide .tags .badge.cyan {
	color: var(--cyan);
	border-color: color-mix(in oklab, var(--cyan) 55%, transparent);
}
.slide .tags .badge.violet {
	color: var(--violet);
	border-color: color-mix(in oklab, var(--violet) 55%, transparent);
}
.slide .tags .badge.coral {
	color: var(--coral);
	border-color: color-mix(in oklab, var(--coral) 55%, transparent);
}

/* Mono-Fußnote unter dem Intro-Inhalt */
.mono-note {
	color: var(--faint);
	font-family: var(--f-mono);
	font-size: 0.82rem;
	letter-spacing: 0.02em;
	max-width: 60ch;
	line-height: 1.6;
}
.mono-note code {
	color: var(--dim);
}

/* --- Code --- */
pre.code {
	margin: 0;
	padding: 1rem 1.2rem;
	background: var(--ink-2);
	border: 1px solid var(--line);
	border-left: 3px solid var(--accent);
	border-radius: 0.6rem;
	overflow-x: auto; /* nur horizontal scrollen bei langen Zeilen */
	overflow-y: visible;
	font-family: var(--f-mono);
	font-size: 0.92rem;
	line-height: 1.6;
	color: var(--text);
}
pre.code .tk-cmt {
	color: var(--faint);
}
pre.code .tk-str {
	color: #7ee0a8;
}
pre.code .tk-num {
	color: var(--coral);
}
pre.code .tk-kw {
	color: var(--violet);
	font-weight: 600;
}
pre.code .tk-at {
	color: var(--violet);
	font-weight: 600;
}
pre.code .tk-fn {
	color: var(--cyan);
}
pre.code .tk-prop {
	color: #b0b8d0;
}
pre.code .tk-punc {
	color: var(--dim);
}

/* --- Iframe demo --- */
.demo-embed {
	position: relative;
	border: 1px solid var(--line);
	border-radius: 0.75rem;
	overflow: hidden;
	background: var(--ink-2);
	display: flex;
	flex: 0 0 auto;
	height: min(60vh, 520px);
}
.demo-embed iframe {
	border: 0;
	width: 100%;
	height: 100%;
	background: var(--ink);
	flex: 1;
}
.demo-embed .open-external {
	position: absolute;
	top: 0.75rem;
	right: 0.75rem;
	z-index: 2;
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
	background: var(--ink-3);
	border: 1.5px solid var(--line);
	color: var(--dim);
	border-radius: 999px;
	padding: 0.5rem 0.95rem;
	font-family: var(--f-mono);
	font-size: 0.85rem;
	line-height: 1;
	text-decoration: none;
	transition:
		color 0.15s ease,
		border-color 0.15s ease,
		background 0.15s ease,
		box-shadow 0.15s ease;
}
.demo-embed .open-external .icon {
	display: block; /* SVG hat eigene Baseline — block + flex-center gibt sauberes vertikales Alignment */
	flex-shrink: 0;
}
.demo-embed .open-external:hover {
	color: var(--text);
	background: var(--ink-3);
	border-color: color-mix(in oklab, var(--accent) 65%, transparent);
	box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 15%, transparent);
	text-decoration: none;
}
.demo-embed .open-external:focus-visible {
	outline: none;
	border-color: color-mix(in oklab, var(--accent) 75%, transparent);
	box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 20%, transparent);
}

.grid-2 {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
	flex: 0 0 auto;
}
.grid-2 .demo-embed {
	height: min(50vh, 440px);
}

/* --- Keyboard-Hint bottom-left --- */
.kbd-hint {
	position: fixed;
	bottom: 1.5rem;
	left: calc(var(--rail-w) + 1.5rem);
	display: flex;
	gap: 0.55rem;
	align-items: center;
	color: var(--faint);
	font-family: var(--f-mono);
	font-size: 0.78rem;
	letter-spacing: 0.02em;
	z-index: 5;
	view-transition-name: chrome-kbd;
}
.kbd-hint .keys {
	display: inline-flex;
	gap: 0.25rem;
}
.kbd-hint kbd {
	display: inline-grid;
	place-items: center;
	min-width: 1.6rem;
	height: 1.6rem;
	padding: 0 0.4rem;
	border: 1px solid var(--line);
	border-radius: 0.4rem;
	background: var(--ink-2);
	color: var(--dim);
	font-family: var(--f-mono);
	font-size: 0.75rem;
	line-height: 1;
}
.kbd-hint .dot {
	color: var(--faint);
	margin: 0 0.25rem;
}

/* --- On-screen nav --- */
.controls {
	position: fixed;
	bottom: 1.25rem;
	right: 2rem;
	display: flex;
	gap: 0.5rem;
	z-index: 5;
	view-transition-name: chrome-controls;
}
.controls button {
	width: 52px;
	height: 52px;
	padding: 0;
	display: grid;
	place-items: center;
	font-family: var(--f-body);
	font-size: 1.5rem;
	line-height: 1;
	border-radius: 0.75rem;
	background: var(--ink-2);
	border: 1.5px solid var(--line);
	color: var(--dim);
	transition:
		color 0.15s ease,
		border-color 0.15s ease,
		box-shadow 0.15s ease,
		background 0.15s ease;
}
.controls button:hover {
	color: var(--text);
	background: var(--ink-3);
	border-color: color-mix(in oklab, var(--accent) 65%, transparent);
	box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 15%, transparent);
}
.controls button:focus-visible {
	outline: none;
	border-color: color-mix(in oklab, var(--accent) 75%, transparent);
	box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 20%, transparent);
}
.controls button.flash {
	animation: nav-flash 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}
@keyframes nav-flash {
	0% {
		background: var(--ink-2);
		border-color: var(--line);
		color: var(--dim);
		box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 0%, transparent);
	}
	35% {
		background: var(--ink-3);
		border-color: color-mix(in oklab, var(--accent) 80%, transparent);
		color: var(--text);
		box-shadow: 0 0 0 5px color-mix(in oklab, var(--accent) 28%, transparent);
	}
	100% {
		background: var(--ink-2);
		border-color: var(--line);
		color: var(--dim);
		box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 0%, transparent);
	}
}

/* Support-Table: caniuse-Look, dark-mode. Browser als Header quer, Datenzeilen darunter. */
.support-table {
	display: flex;
	flex-direction: column;
	gap: 0.4rem;
	padding: 0.9rem;
	background: var(--ink-2);
	border: 1px solid var(--line);
	border-radius: 0.75rem;
	font-family: var(--f-mono);
	max-width: 900px;
}
.support-table .row {
	display: grid;
	grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr;
	gap: 0.4rem;
	align-items: stretch;
}
.support-table .row.head .cell {
	background: transparent;
	color: var(--faint);
	font-size: 0.7rem;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	padding: 0.25rem 0.6rem 0.5rem;
	border: 0;
	text-align: center;
}
.support-table .row.head .cell.label {
	text-align: left;
}
.support-table .cell {
	padding: 0.9rem 0.75rem;
	border-radius: 0.5rem;
	font-size: 0.95rem;
	line-height: 1.2;
	background: var(--ink-3);
	color: var(--text);
	text-align: center;
	display: flex;
	align-items: center;
	justify-content: center;
}
.support-table .cell.label {
	background: transparent;
	color: var(--text);
	font-weight: 600;
	justify-content: flex-start;
	padding-left: 0.4rem;
	font-size: 0.9rem;
}
.support-table .cell.label code {
	color: var(--text);
	font-size: 0.92em;
}

/* Support-Status-Farben — angelehnt an caniuse, im Dark-Theme */
.support-table .cell.ok {
	background: color-mix(in oklab, #7ee0a8 18%, var(--ink-3));
	color: #7ee0a8;
	box-shadow: inset 3px 0 0 #7ee0a8;
}
.support-table .cell.no {
	background: color-mix(in oklab, var(--coral) 15%, var(--ink-3));
	color: var(--coral);
	box-shadow: inset 3px 0 0 var(--coral);
}
.support-table .cell.partial {
	background: color-mix(in oklab, #f0b96c 15%, var(--ink-3));
	color: #f0b96c;
	box-shadow: inset 3px 0 0 #f0b96c;
}
.support-table .cell.info {
	background: color-mix(in oklab, var(--cyan) 15%, var(--ink-3));
	color: var(--cyan);
	box-shadow: inset 3px 0 0 var(--cyan);
}

/* --- caniuse Links --- */
.caniuse-links {
	margin-top: 0.5rem;
	color: var(--faint);
	font-family: var(--f-mono);
	font-size: 0.82rem;
	letter-spacing: 0.02em;
}
.caniuse-links a {
	color: var(--dim);
	text-decoration: none;
	border-bottom: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
	transition:
		color 0.15s,
		border-color 0.15s;
}
.caniuse-links a:hover {
	color: var(--accent);
	border-color: var(--accent);
}

/* --- Sources / Weiterlesen --- */
.sources {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
	gap: 1.5rem 2rem;
	margin-top: 1rem;
}
.source-group {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
}
.source-heading {
	font-family: var(--f-mono);
	font-size: 0.72rem;
	letter-spacing: 0.24em;
	text-transform: uppercase;
	color: var(--dim);
}
.sources ul {
	list-style: none;
	padding: 0;
	margin: 0;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
	font-size: 1rem;
}
.sources li {
	color: var(--dim);
	line-height: 1.4;
	margin: 0;
}
.sources a {
	color: var(--text);
	text-decoration: none;
	border-bottom: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
	transition: border-color 0.15s, color 0.15s;
}
.sources a:hover {
	color: var(--accent);
	border-color: var(--accent);
}

/* --- Root VT --- */
::view-transition-old(root),
::view-transition-new(root) {
	animation-duration: 0.5s;
	animation-timing-function: cubic-bezier(0.7, 0, 0.2, 1);
}
::view-transition-old(root) {
	animation-name: vt-out;
}
::view-transition-new(root) {
	animation-name: vt-in;
}
@keyframes vt-out {
	to {
		opacity: 0;
		transform: translateY(-14px);
	}
}
@keyframes vt-in {
	from {
		opacity: 0;
		transform: translateY(18px);
	}
}

::view-transition-group(playhead) {
	animation-duration: 0.55s;
	animation-timing-function: cubic-bezier(0.7, 0, 0.2, 1);
}

/* Chrome (HUD, Nav-Buttons, Keyboard-Hint, Rail-Labels):
   Namen entkoppeln sie vom Root-Snapshot (kein Mit-Translate),
   und die Pseudo-Animationen sind aus — Inhalt snappt statt zu faden. */
::view-transition-group(chrome-hud),
::view-transition-group(chrome-kbd),
::view-transition-group(chrome-controls),
::view-transition-group(chrome-edge-brand),
::view-transition-group(chrome-signet),
::view-transition-group(chrome-rail-total) {
	animation: none;
}
::view-transition-old(chrome-hud),
::view-transition-old(chrome-kbd),
::view-transition-old(chrome-controls),
::view-transition-old(chrome-edge-brand),
::view-transition-old(chrome-signet),
::view-transition-old(chrome-rail-total) {
	animation: none;
	opacity: 0;
}
::view-transition-new(chrome-hud),
::view-transition-new(chrome-kbd),
::view-transition-new(chrome-controls),
::view-transition-new(chrome-edge-brand),
::view-transition-new(chrome-signet),
::view-transition-new(chrome-rail-total) {
	animation: none;
	opacity: 1;
}

/* --- Responsive --- */
@media (max-width: 720px) {
	:root {
		--rail-w: 0px;
	}
	.rail {
		display: none;
	}
	.signet {
		left: 1.25rem;
	}
	.grid-2 {
		grid-template-columns: 1fr;
	}
	.kbd-hint {
		display: none;
	}
	.hud {
		top: 1rem;
		right: 1rem;
	}
	.hud .count {
		font-size: 1.2rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	::view-transition-group(*),
	::view-transition-old(*),
	::view-transition-new(*) {
		animation: none !important;
	}
}