/* Vectra-180 -- landing site
 *
 * Hand-written CSS. No framework, no build step, no CDN. The page has to be
 * complete in the first HTTP response, so nothing here is allowed to be
 * load-bearing for content -- it only decorates markup that already says
 * everything on its own.
 */

/* ---------------------------------------------------------------- tokens */

:root {
	color-scheme: dark light;

	--bg: #070a12;
	--bg-2: #0b0f19;
	--panel: #10162a;
	--panel-2: #141c33;
	--line: #1e2640;
	--line-2: #2b3550;
	--text: #e8edf7;
	--muted: #94a3b8;
	--dim: #7b8aa4;
	--cyan: #00f2fe;
	--blue: #4facfe;
	--ok: #34d399;
	--warn: #fbbf24;
	--bad: #f87171;

	/* Code windows carry their own palette. They used to be pinned dark in
	   both themes; a white terminal in a white page reads better than a black
	   hole punched through it, so light mode gets a real light scheme with
	   syntax colours re-picked for contrast against white. */
	--code-bg: color-mix(in srgb, #05080f 88%, var(--panel));
	--code-fg: #d6e3f5;
	--code-dim: #7d8ba3;
	--code-rule: rgb(255 255 255 / 0.07);
	--code-chip: rgb(255 255 255 / 0.04);
	--code-chip-line: rgb(255 255 255 / 0.12);
	--tok-c: #6b7c99;
	--tok-k: #7ee0f2;
	--tok-s: #a8e6a3;
	--tok-f: #f0c987;
	--tok-ok: #6ee7b7;
	--tok-warn: #fcd34d;
	--tok-bad: #fca5a5;

	/* Surfaces that stand in for video -- the hero demo and the interface map's
	   viewport -- are black under both themes, because that is what a picture
	   looks like before it arrives. Their chrome cannot follow --panel and
	   --dim: in light mode those are white and a pale grey, and the labels
	   would dissolve into the frame. These are fixed, and deliberately so. */
	--stage: #05080f;
	--stage-chrome: color-mix(in srgb, #10162a 74%, transparent);
	--stage-line: #1e2640;
	--on-stage: #cddaeb;
	--on-stage-dim: #93a2ba;

	--accent-grad: linear-gradient(100deg, var(--cyan), var(--blue));
	--glow: 0 0 0 1px rgb(0 242 254 / 0.25), 0 12px 48px -12px rgb(0 242 254 / 0.35);

	--mono: ui-monospace, "SFMono-Regular", "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, monospace;
	--sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

	--rad: 14px;
	--rad-sm: 8px;
	--maxw: 1160px;
	--gutter: clamp(1.1rem, 4vw, 2.5rem);

	--ease: cubic-bezier(0.22, 1, 0.36, 1);

	/* A circled checkmark, used as a mask so the colour stays themeable. */
	--tick: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Ccircle cx='10' cy='10' r='9' fill='none' stroke='%23000' stroke-width='1.4' opacity='.55'/%3E%3Cpath d='M5.9 10.3l2.7 2.8 5.5-5.9' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

:root[data-theme="light"],
html[data-theme="light"] {
	color-scheme: light;

	--bg: #f6f8fc;
	--bg-2: #ffffff;
	--panel: #ffffff;
	--panel-2: #f1f5fb;
	--line: #dbe3f0;
	--line-2: #c3cfe2;
	--text: #0b1220;
	--muted: #4a5769;
	--dim: #616f85;
	--cyan: #08788d;
	--blue: #2563eb;
	--ok: #047857;
	--warn: #a16207;
	--bad: #b91c1c;

	--code-bg: #ffffff;
	--code-fg: #1f2937;
	--code-dim: #616f85;
	--code-rule: rgb(15 23 42 / 0.09);
	--code-chip: rgb(15 23 42 / 0.03);
	--code-chip-line: rgb(15 23 42 / 0.14);
	--tok-c: #64748b;
	--tok-k: #0369a1;
	--tok-s: #15803d;
	--tok-f: #b45309;
	--tok-ok: #047857;
	--tok-warn: #a16207;
	--tok-bad: #b91c1c;

	--glow: 0 0 0 1px rgb(37 99 235 / 0.18), 0 14px 42px -16px rgb(37 99 235 / 0.35);
}

@media (prefers-color-scheme: light) {
	:root:not([data-theme="dark"]) {
		color-scheme: light;

		--bg: #f6f8fc;
		--bg-2: #ffffff;
		--panel: #ffffff;
		--panel-2: #f1f5fb;
		--line: #dbe3f0;
		--line-2: #c3cfe2;
		--text: #0b1220;
		--muted: #4a5769;
		--dim: #616f85;
		--cyan: #08788d;
		--blue: #2563eb;
		--ok: #047857;
		--warn: #a16207;
		--bad: #b91c1c;

		--code-bg: #ffffff;
		--code-fg: #1f2937;
		--code-dim: #616f85;
		--code-rule: rgb(15 23 42 / 0.09);
		--code-chip: rgb(15 23 42 / 0.03);
		--code-chip-line: rgb(15 23 42 / 0.14);
		--tok-c: #64748b;
		--tok-k: #0369a1;
		--tok-s: #15803d;
		--tok-f: #b45309;
		--tok-ok: #047857;
		--tok-warn: #a16207;
		--tok-bad: #b91c1c;

		--glow: 0 0 0 1px rgb(37 99 235 / 0.18), 0 14px 42px -16px rgb(37 99 235 / 0.35);
	}
}

/* ------------------------------------------------------------------ base */

*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
	scroll-padding-top: 5.5rem;
	-webkit-text-size-adjust: 100%;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font-family: var(--sans);
	font-size: clamp(1rem, 0.96rem + 0.2vw, 1.075rem);
	line-height: 1.65;
	overflow-x: hidden;
	-webkit-font-smoothing: antialiased;
}

/* A faint grid, the same optical-bench motif as the project icon. */
body::before {
	content: "";
	position: fixed;
	inset: 0;
	z-index: -2;
	pointer-events: none;
	background:
		radial-gradient(1100px 620px at 76% -8%, rgb(0 242 254 / 0.09), transparent 62%),
		radial-gradient(900px 560px at 8% 6%, rgb(79 172 254 / 0.08), transparent 60%),
		linear-gradient(180deg, var(--bg-2), var(--bg) 42%);
}

body::after {
	content: "";
	position: fixed;
	inset: 0;
	z-index: -1;
	pointer-events: none;
	opacity: 0.5;
	background-image:
		linear-gradient(to right, color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px),
		linear-gradient(to bottom, color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px);
	background-size: 64px 64px;
	mask-image: radial-gradient(ellipse 120% 80% at 50% 0%, #000 12%, transparent 72%);
}

h1,
h2,
h3,
h4 {
	line-height: 1.15;
	letter-spacing: -0.022em;
	margin: 0 0 0.6em;
	text-wrap: balance;
}

h2 {
	font-size: clamp(1.75rem, 1.2rem + 2.1vw, 2.65rem);
	font-weight: 800;
}

h3 {
	font-size: clamp(1.12rem, 1rem + 0.5vw, 1.32rem);
	font-weight: 700;
}

p {
	margin: 0 0 1.1em;
	text-wrap: pretty;
}

a {
	color: var(--blue);
	text-decoration-color: color-mix(in srgb, var(--blue) 40%, transparent);
	text-underline-offset: 3px;
	transition: color 0.18s var(--ease), text-decoration-color 0.18s var(--ease);
}

a:hover {
	color: var(--cyan);
	text-decoration-color: currentColor;
}

:focus-visible {
	outline: 2px solid var(--cyan);
	outline-offset: 3px;
	border-radius: 4px;
}

code,
kbd,
samp,
pre {
	font-family: var(--mono);
	font-size: 0.875em;
}

:not(pre) > code {
	background: color-mix(in srgb, var(--panel-2) 80%, transparent);
	border: 1px solid var(--line);
	border-radius: 5px;
	padding: 0.12em 0.4em;
	white-space: nowrap;
}

kbd {
	background: var(--panel-2);
	border: 1px solid var(--line-2);
	border-bottom-width: 2px;
	border-radius: 5px;
	padding: 0.1em 0.42em;
	font-size: 0.8em;
}

img,
svg,
canvas {
	max-width: 100%;
	height: auto;
	display: block;
}

hr {
	border: 0;
	border-top: 1px solid var(--line);
	margin: 0;
}

.skip {
	position: absolute;
	left: -9999px;
	top: 0;
	background: var(--panel);
	color: var(--text);
	padding: 0.7rem 1.1rem;
	border: 1px solid var(--cyan);
	border-radius: var(--rad-sm);
	z-index: 100;
}

.skip:focus {
	left: 1rem;
	top: 1rem;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0 0 0 0);
	white-space: nowrap;
	border: 0;
}

/* --------------------------------------------------------------- layout */

.wrap {
	width: 100%;
	max-width: var(--maxw);
	margin-inline: auto;
	padding-inline: var(--gutter);
}

section {
	padding-block: clamp(3.5rem, 7vw, 6.5rem);
	position: relative;
}

.section-head {
	max-width: 62ch;
	margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section-head p {
	color: var(--muted);
	font-size: 1.075em;
	margin-bottom: 0;
}

.eyebrow {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	font-family: var(--mono);
	font-size: 0.72rem;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--cyan);
	margin-bottom: 0.9rem;
}

.eyebrow::before {
	content: "";
	width: 1.6rem;
	height: 1px;
	background: currentColor;
	opacity: 0.6;
}

.grid {
	display: grid;
	gap: clamp(1rem, 2vw, 1.5rem);
}

.g-2 {
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
}

.g-3 {
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
}

.g-4 {
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 13.5rem), 1fr));
}

/* ---------------------------------------------------------------- cards */

.card {
	background: color-mix(in srgb, var(--panel) 86%, transparent);
	border: 1px solid var(--line);
	border-radius: var(--rad);
	padding: clamp(1.1rem, 2vw, 1.6rem);
	position: relative;
	overflow: hidden;
	transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.card::before {
	content: "";
	position: absolute;
	inset: 0 0 auto;
	height: 1px;
	background: var(--accent-grad);
	opacity: 0;
	transition: opacity 0.25s var(--ease);
}

.card:hover {
	border-color: var(--line-2);
	transform: translateY(-3px);
	box-shadow: 0 18px 40px -28px rgb(0 0 0 / 0.8);
}

.card:hover::before {
	opacity: 0.9;
}

.card h3 {
	margin-bottom: 0.45rem;
}

.card p:last-child {
	margin-bottom: 0;
}

.card p {
	color: var(--muted);
	font-size: 0.96em;
}

.card .ico {
	width: 2.4rem;
	height: 2.4rem;
	display: grid;
	place-items: center;
	border-radius: 10px;
	background: color-mix(in srgb, var(--cyan) 12%, transparent);
	border: 1px solid color-mix(in srgb, var(--cyan) 28%, transparent);
	color: var(--cyan);
	margin-bottom: 0.9rem;
}

.card .ico svg {
	width: 1.25rem;
	height: 1.25rem;
}

/* ------------------------------------------------------------------ nav */

.nav {
	position: sticky;
	top: 0;
	z-index: 50;
	background: color-mix(in srgb, var(--bg) 72%, transparent);
	backdrop-filter: blur(14px) saturate(140%);
	-webkit-backdrop-filter: blur(14px) saturate(140%);
	border-bottom: 1px solid transparent;
	transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.nav.stuck {
	border-bottom-color: var(--line);
	background: color-mix(in srgb, var(--bg) 88%, transparent);
}

.nav-in {
	display: flex;
	align-items: center;
	gap: 1rem;
	height: 4rem;
}

.brand {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	font-weight: 800;
	letter-spacing: -0.02em;
	color: var(--text);
	text-decoration: none;
	font-size: 1.05rem;
	margin-right: auto;
}

.brand img {
	width: 1.85rem;
	height: 1.85rem;
	border-radius: 7px;
}

.brand b {
	background: var(--accent-grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
	font-weight: 800;
}

.nav-links {
	display: flex;
	gap: 0.3rem;
	align-items: center;
	list-style: none;
	margin: 0;
	padding: 0;
}

.nav-links a {
	color: var(--muted);
	text-decoration: none;
	font-size: 0.92rem;
	font-weight: 550;
	padding: 0.45rem 0.7rem;
	border-radius: var(--rad-sm);
	transition: color 0.18s var(--ease), background 0.18s var(--ease);
}

.nav-links a:hover {
	color: var(--text);
	background: color-mix(in srgb, var(--panel-2) 75%, transparent);
}

@media (max-width: 860px) {
	.nav-links {
		display: none;
	}
}

.icon-btn {
	display: grid;
	place-items: center;
	width: 2.3rem;
	height: 2.3rem;
	border-radius: var(--rad-sm);
	border: 1px solid var(--line);
	background: color-mix(in srgb, var(--panel) 70%, transparent);
	color: var(--muted);
	cursor: pointer;
	transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.icon-btn:hover {
	color: var(--cyan);
	border-color: var(--line-2);
}

.icon-btn svg {
	width: 1.05rem;
	height: 1.05rem;
}

.icon-btn .sun {
	display: none;
}

:root[data-theme="light"] .icon-btn .sun {
	display: block;
}

:root[data-theme="light"] .icon-btn .moon {
	display: none;
}

@media (prefers-color-scheme: light) {
	:root:not([data-theme="dark"]) .icon-btn .sun {
		display: block;
	}

	:root:not([data-theme="dark"]) .icon-btn .moon {
		display: none;
	}
}

/* --------------------------------------------------------------- button */

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	padding: 0.72rem 1.25rem;
	border-radius: 10px;
	border: 1px solid var(--line-2);
	background: color-mix(in srgb, var(--panel) 80%, transparent);
	color: var(--text);
	font: inherit;
	font-size: 0.95rem;
	font-weight: 600;
	text-decoration: none;
	cursor: pointer;
	white-space: nowrap;
	transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease),
		background 0.18s var(--ease);
}

.btn:hover {
	transform: translateY(-2px);
	border-color: color-mix(in srgb, var(--cyan) 45%, var(--line-2));
	color: var(--text);
}

.btn:active {
	transform: translateY(0);
}

.btn svg {
	width: 1.05rem;
	height: 1.05rem;
	flex: none;
}

.btn-primary {
	background: var(--accent-grad);
	border-color: transparent;
	color: #04121b;
	font-weight: 700;
}

.btn-primary:hover {
	color: #04121b;
	box-shadow: var(--glow);
}

/* ----------------------------------------------------------------- hero */

.hero {
	padding-block: clamp(2.5rem, 6vw, 5rem) clamp(3rem, 6vw, 5.5rem);
	position: relative;
}

.hero-grid {
	display: grid;
	grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
	gap: clamp(1.8rem, 4vw, 3.5rem);
	align-items: center;
}

@media (max-width: 1000px) {
	.hero-grid {
		grid-template-columns: 1fr;
	}
}

.pill {
	display: inline-flex;
	align-items: center;
	gap: 0.55rem;
	padding: 0.32rem 0.85rem 0.32rem 0.42rem;
	border: 1px solid var(--line);
	border-radius: 999px;
	background: color-mix(in srgb, var(--panel) 70%, transparent);
	font-size: 0.8rem;
	color: var(--muted);
	text-decoration: none;
	margin-bottom: 1.4rem;
}

.pill:hover {
	border-color: color-mix(in srgb, var(--cyan) 40%, var(--line));
	color: var(--text);
}

.pill em {
	font-style: normal;
	font-family: var(--mono);
	font-size: 0.72rem;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	background: var(--accent-grad);
	color: #04121b;
	padding: 0.16rem 0.5rem;
	border-radius: 999px;
	font-weight: 700;
}

h1 {
	font-size: clamp(2.4rem, 1.3rem + 4.6vw, 4.15rem);
	font-weight: 850;
	letter-spacing: -0.035em;
	margin-bottom: 0.4em;
}

h1 .grad {
	background: var(--accent-grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

.lede {
	font-size: clamp(1.06rem, 1rem + 0.45vw, 1.24rem);
	color: var(--muted);
	max-width: 46ch;
}

.hero-cta {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem;
	margin: 1.8rem 0 1.5rem;
}

.hero-facts {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem 1.5rem;
	list-style: none;
	padding: 0;
	margin: 0;
	font-size: 0.88rem;
	color: var(--dim);
}

.hero-facts li {
	display: flex;
	align-items: center;
	gap: 0.45rem;
}

.hero-facts li::before {
	content: "";
	width: 5px;
	height: 5px;
	border-radius: 50%;
	background: var(--cyan);
	box-shadow: 0 0 8px var(--cyan);
	flex: none;
}

/* ------------------------------------------------------------ hero demo */

.demo {
	border: 1px solid var(--line);
	border-radius: var(--rad);
	background: var(--stage);
	overflow: hidden;
	box-shadow: 0 40px 90px -50px rgb(0 0 0 / 0.9);
	position: relative;
}

.demo-bar {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.55rem 0.85rem;
	border-bottom: 1px solid var(--stage-line);
	background: var(--stage-chrome);
	font-family: var(--mono);
	font-size: 0.72rem;
	color: var(--on-stage-dim);
	letter-spacing: 0.04em;
}

.dot {
	width: 8px;
	height: 8px;
	border-radius: 50%;
	background: var(--line-2);
	flex: none;
}

.dot.live {
	background: var(--bad);
	animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
	0%,
	100% {
		opacity: 1;
		box-shadow: 0 0 0 0 rgb(248 113 113 / 0.55);
	}

	50% {
		opacity: 0.65;
		box-shadow: 0 0 0 6px rgb(248 113 113 / 0);
	}
}

.demo-stage {
	position: relative;
	aspect-ratio: 16 / 9;
	background: #05080f;
}

.demo-stage canvas,
.demo-stage .fallback {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
}

.demo-stage canvas {
	opacity: 0;
	transition: opacity 0.6s var(--ease);
}

.demo-stage canvas.ready {
	opacity: 1;
}

/* The still poster is the default. WebGL replaces it; if WebGL is missing,
 * or JS never runs, this is what everyone sees -- so it has to stand alone. */
.fallback {
	object-fit: cover;
}

.demo-hud {
	position: absolute;
	inset: auto 0 0 0;
	display: flex;
	justify-content: space-between;
	gap: 1rem;
	padding: 0.6rem 0.9rem;
	font-family: var(--mono);
	font-size: 0.68rem;
	color: #cbe9f5;
	background: linear-gradient(transparent, rgb(3 6 12 / 0.82));
	pointer-events: none;
	letter-spacing: 0.04em;
}

.demo-controls {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	padding: 0.7rem 0.85rem;
	border-top: 1px solid var(--stage-line);
	background: var(--stage-chrome);
	font-size: 0.78rem;
	color: var(--on-stage);
	flex-wrap: wrap;
}

.demo-controls label {
	font-family: var(--mono);
	font-size: 0.7rem;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--on-stage-dim);
	white-space: nowrap;
}

.demo-controls input[type="range"] {
	flex: 1 1 8rem;
	min-width: 6rem;
	accent-color: var(--cyan);
	/* 24px, the smallest target WCAG 2.2 accepts for a control that is not an
	   inline link -- and the difference between dragging this on a phone and
	   missing it. */
	height: 1.5rem;
	cursor: grab;
}

.demo-note {
	font-size: 0.78rem;
	color: var(--dim);
	margin: 0.85rem 0 0;
	text-align: center;
}

/* ------------------------------------------------------------ code / cli */

.code {
	position: relative;
	border: 1px solid var(--line);
	border-radius: var(--rad);
	background: var(--code-bg);
	overflow: hidden;
}

.code-head {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.5rem 0.6rem 0.5rem 0.9rem;
	border-bottom: 1px solid var(--code-rule);
	font-family: var(--mono);
	font-size: 0.72rem;
	color: var(--code-dim);
}

.code-head .grow {
	margin-left: auto;
}

.code pre {
	margin: 0;
	padding: 1rem 1.1rem;
	overflow-x: auto;
	color: var(--code-fg);
	line-height: 1.7;
	tab-size: 2;
}

.code pre code {
	background: none;
	border: 0;
	padding: 0;
	white-space: pre;
	font-size: 0.83rem;
}

.copy {
	border: 1px solid var(--code-chip-line);
	background: var(--code-chip);
	color: var(--code-dim);
	font: inherit;
	font-family: var(--mono);
	font-size: 0.7rem;
	padding: 0.2rem 0.55rem;
	border-radius: 6px;
	cursor: pointer;
	transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.copy:hover {
	color: var(--cyan);
	border-color: color-mix(in srgb, var(--cyan) 45%, transparent);
}

.copy.done {
	color: var(--ok);
	border-color: color-mix(in srgb, var(--ok) 45%, transparent);
}

.tok-c {
	color: var(--tok-c);
}

/* comment */
.tok-k {
	color: var(--tok-k);
}

/* command / keyword */
.tok-s {
	color: var(--tok-s);
}

/* string / path */
.tok-f {
	color: var(--tok-f);
}

/* flag */
.tok-ok {
	color: var(--tok-ok);
}

.tok-warn {
	color: var(--tok-warn);
}

.tok-bad {
	color: var(--tok-bad);
}

/* ----------------------------------------------------------------- tabs */

.tabs {
	display: flex;
	gap: 0.3rem;
	flex-wrap: wrap;
	margin-bottom: 1rem;
	border-bottom: 1px solid var(--line);
	padding-bottom: 0.6rem;
}

.tabs button {
	border: 1px solid transparent;
	background: none;
	color: var(--muted);
	font: inherit;
	font-size: 0.9rem;
	font-weight: 600;
	padding: 0.42rem 0.85rem;
	border-radius: var(--rad-sm);
	cursor: pointer;
	transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.tabs button:hover {
	color: var(--text);
}

.tabs button[aria-selected="true"] {
	color: var(--text);
	background: color-mix(in srgb, var(--panel-2) 85%, transparent);
	border-color: var(--line);
}

/* Panels are all visible until JS says otherwise, so a crawler (and anyone
 * without JS) reads every install method instead of just the first. */
.tabpanel + .tabpanel {
	margin-top: 1.5rem;
}

.js .tabpanel[hidden] {
	display: none;
}

.tabpanel > h3 {
	font-size: 1rem;
	color: var(--muted);
	font-weight: 600;
}

.js .tabpanel > h3 {
	display: none;
}

.panel-note {
	color: var(--muted);
	font-size: 0.92rem;
	margin: 0.9rem 0 0;
}

/* ---------------------------------------------------------------- lists */

.checks {
	list-style: none;
	padding: 0;
	margin: 0;
	display: grid;
	gap: 0.55rem;
}

.checks li {
	display: flex;
	gap: 0.65rem;
	align-items: flex-start;
	color: var(--muted);
	font-size: 0.95rem;
}

/* A ticked circle, drawn as a mask so it takes the theme's accent rather than
   a colour baked into the data URI. The glyph is deliberately unambiguous:
   this is a list of what the command covers, and anything resembling a cross
   reads as a failure that has not happened. */
.checks li::before {
	content: "";
	width: 1.15rem;
	height: 1.15rem;
	margin-top: 0.22rem;
	flex: none;
	background-color: var(--cyan);
	-webkit-mask: var(--tick) center / contain no-repeat;
	mask: var(--tick) center / contain no-repeat;
}

.checks li b {
	color: var(--text);
	font-weight: 650;
}

/* ---------------------------------------------------------------- table */

.table-scroll {
	overflow-x: auto;
	border: 1px solid var(--line);
	border-radius: var(--rad);
	background: color-mix(in srgb, var(--panel) 70%, transparent);
}

table {
	border-collapse: collapse;
	width: 100%;
	min-width: 34rem;
	font-size: 0.92rem;
}

th,
td {
	text-align: left;
	padding: 0.7rem 1rem;
	border-bottom: 1px solid var(--line);
	vertical-align: top;
}

thead th {
	font-size: 0.72rem;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: var(--dim);
	font-weight: 650;
	background: color-mix(in srgb, var(--panel-2) 60%, transparent);
	position: sticky;
	top: 0;
}

tbody tr:last-child td {
	border-bottom: 0;
}

tbody tr:hover td {
	background: color-mix(in srgb, var(--panel-2) 45%, transparent);
}

td code {
	white-space: nowrap;
}

/* ----------------------------------------------------------- rule cards */

.rules {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
	gap: clamp(1rem, 2vw, 1.5rem);
}

.rule {
	position: relative;
	padding: clamp(1.4rem, 2.4vw, 2rem);
	border: 1px solid var(--line);
	border-radius: var(--rad);
	background:
		radial-gradient(120% 100% at 0% 0%, color-mix(in srgb, var(--cyan) 8%, transparent), transparent 60%),
		color-mix(in srgb, var(--panel) 80%, transparent);
	overflow: hidden;
}

.rule::after {
	content: attr(data-n);
	position: absolute;
	right: 0.6rem;
	bottom: -1.4rem;
	font-family: var(--mono);
	font-size: 6rem;
	font-weight: 800;
	color: color-mix(in srgb, var(--cyan) 8%, transparent);
	line-height: 1;
	pointer-events: none;
}

.rule h3 {
	font-size: clamp(1.25rem, 1.1rem + 0.6vw, 1.55rem);
}

.rule p {
	color: var(--muted);
	margin-bottom: 0;
	position: relative;
}

/* ------------------------------------------------------------- diagrams */

.figure {
	border: 1px solid var(--line);
	border-radius: var(--rad);
	background: color-mix(in srgb, var(--panel) 62%, transparent);
	padding: clamp(1rem, 2.5vw, 1.9rem);
	overflow-x: auto;
}

.figure figcaption {
	color: var(--dim);
	font-size: 0.86rem;
	margin-top: 1rem;
	text-align: center;
	text-wrap: pretty;
}

.diagram {
	width: 100%;
	min-width: 30rem;
	height: auto;
	margin-inline: auto;
	display: block;
}

.d-box {
	fill: color-mix(in srgb, var(--panel-2) 92%, transparent);
	stroke: var(--line-2);
	stroke-width: 1.2;
}

.d-box-hot {
	fill: color-mix(in srgb, var(--cyan) 10%, var(--panel-2));
	stroke: color-mix(in srgb, var(--cyan) 55%, transparent);
	stroke-width: 1.4;
}

.d-label {
	fill: var(--text);
	font-family: var(--sans);
	font-size: 12.5px;
	font-weight: 650;
}

.d-sub {
	fill: var(--dim);
	font-family: var(--mono);
	font-size: 9.5px;
}

.d-edge {
	stroke: var(--line-2);
	stroke-width: 1.6;
	fill: none;
}

.d-edge-hot {
	stroke: var(--cyan);
	stroke-width: 1.8;
	fill: none;
	opacity: 0.75;
}

.d-edge-cold {
	stroke: var(--line-2);
	stroke-width: 1.5;
	fill: none;
	stroke-dasharray: 5 4;
}

.d-flow {
	stroke: var(--cyan);
	stroke-width: 2.4;
	fill: none;
	stroke-linecap: round;
	stroke-dasharray: 10 190;
	filter: drop-shadow(0 0 4px var(--cyan));
	animation: flow 3s linear infinite;
}

@keyframes flow {
	to {
		stroke-dashoffset: -200;
	}
}

.d-legend {
	fill: var(--dim);
	font-family: var(--sans);
	font-size: 10.5px;
}

/* frame-anatomy diagram */
.fa-strip {
	fill: color-mix(in srgb, var(--cyan) 22%, var(--panel-2));
	stroke: var(--cyan);
	stroke-width: 1.2;
}

.fa-strip-pulse {
	animation: stripPulse 2.6s ease-in-out infinite;
}

@keyframes stripPulse {
	0%,
	100% {
		opacity: 0.55;
	}

	50% {
		opacity: 1;
	}
}

.fa-eye {
	fill: color-mix(in srgb, var(--blue) 8%, var(--panel-2));
	stroke: var(--line-2);
	stroke-width: 1.2;
}

.fa-lens {
	fill: none;
	stroke: color-mix(in srgb, var(--cyan) 45%, transparent);
	stroke-width: 1.4;
}

.fa-dim {
	stroke: var(--dim);
	stroke-width: 1;
	fill: none;
}

.fa-dim-t {
	fill: var(--dim);
	font-family: var(--mono);
	font-size: 10px;
	text-anchor: middle;
}

/* --------------------------------------------------------------- UI map */

.uimap {
	border: 1px solid var(--line);
	border-radius: var(--rad);
	overflow: hidden;
	background: color-mix(in srgb, var(--panel) 80%, transparent);
}

.uimap-bar {
	display: flex;
	align-items: center;
	gap: 0.55rem;
	padding: 0.5rem 0.8rem;
	border-bottom: 1px solid var(--line);
	font-family: var(--mono);
	font-size: 0.72rem;
	color: var(--dim);
	background: color-mix(in srgb, var(--panel-2) 60%, transparent);
}

.uimap-url {
	flex: 1;
	background: color-mix(in srgb, var(--bg) 60%, transparent);
	border: 1px solid var(--line);
	border-radius: 999px;
	padding: 0.15rem 0.7rem;
	color: var(--muted);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.uimap-body {
	display: grid;
	grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
	gap: 1px;
	background: var(--line);
}

@media (max-width: 720px) {
	.uimap-body {
		grid-template-columns: 1fr;
	}
}

.uimap-cell {
	background: var(--panel);
	padding: 0.95rem 1.05rem;
}

.uimap-view {
	aspect-ratio: 2 / 1;
	background:
		radial-gradient(circle at 27% 55%, color-mix(in srgb, var(--cyan) 22%, transparent) 0 14%, transparent 15%),
		radial-gradient(circle at 73% 55%, color-mix(in srgb, var(--cyan) 22%, transparent) 0 14%, transparent 15%),
		linear-gradient(160deg, #0d1526, #060a13);
	border: 1px solid var(--line);
	border-radius: var(--rad-sm);
	position: relative;
	overflow: hidden;
	display: grid;
	place-items: center;
	color: var(--on-stage-dim);
	font-family: var(--mono);
	font-size: 0.7rem;
}

.uimap-view::after {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(transparent 0 48%, color-mix(in srgb, var(--cyan) 30%, transparent) 50%, transparent 52%);
	animation: scan 4.5s linear infinite;
}

@keyframes scan {
	0% {
		transform: translateY(-100%);
	}

	100% {
		transform: translateY(100%);
	}
}

.uimap-label {
	font-family: var(--mono);
	font-size: 0.68rem;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: var(--dim);
	margin-bottom: 0.6rem;
}

.meter {
	height: 8px;
	border-radius: 999px;
	background: color-mix(in srgb, var(--line) 80%, transparent);
	overflow: hidden;
	margin: 0.4rem 0 0.15rem;
}

.meter i {
	display: block;
	height: 100%;
	border-radius: 999px;
	background: var(--accent-grad);
	width: 0;
	animation: fill 1.6s var(--ease) forwards;
}

.meter.ev i {
	background: linear-gradient(100deg, var(--warn), #f97316);
	animation-delay: 0.25s;
}

@keyframes fill {
	to {
		width: var(--w, 60%);
	}
}

.cliplist {
	list-style: none;
	margin: 0.35rem 0 0;
	padding: 0;
	font-family: var(--mono);
	font-size: 0.74rem;
	display: grid;
	gap: 0.35rem;
}

.cliplist li {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	color: var(--muted);
	padding: 0.32rem 0.5rem;
	border: 1px solid var(--line);
	border-radius: 6px;
	background: color-mix(in srgb, var(--panel-2) 50%, transparent);
}

.cliplist .tag {
	margin-left: auto;
	font-size: 0.66rem;
	padding: 0.05rem 0.4rem;
	border-radius: 999px;
	border: 1px solid var(--line-2);
	color: var(--dim);
}

.cliplist .tag.lock {
	color: var(--warn);
	border-color: color-mix(in srgb, var(--warn) 45%, transparent);
}

/* ------------------------------------------------------------------ faq */

details {
	border: 1px solid var(--line);
	border-radius: var(--rad);
	background: color-mix(in srgb, var(--panel) 70%, transparent);
	padding: 0 1.15rem;
	transition: border-color 0.2s var(--ease);
}

details + details {
	margin-top: 0.7rem;
}

details[open] {
	border-color: var(--line-2);
}

summary {
	cursor: pointer;
	list-style: none;
	padding: 1rem 2rem 1rem 0;
	font-weight: 650;
	position: relative;
}

summary::-webkit-details-marker {
	display: none;
}

summary::after {
	content: "";
	position: absolute;
	right: 0.35rem;
	top: 1.45rem;
	width: 8px;
	height: 8px;
	border-right: 2px solid var(--muted);
	border-bottom: 2px solid var(--muted);
	transform: rotate(45deg);
	transition: transform 0.22s var(--ease);
}

details[open] summary::after {
	transform: rotate(-135deg);
}

details > *:not(summary) {
	color: var(--muted);
	font-size: 0.96em;
}

details > p:last-child {
	padding-bottom: 1rem;
	margin-bottom: 0;
}

/* ---------------------------------------------------------------- final */

.cta {
	border: 1px solid var(--line);
	border-radius: var(--rad);
	padding: clamp(1.8rem, 4vw, 3.2rem);
	text-align: center;
	background:
		radial-gradient(120% 140% at 50% 0%, color-mix(in srgb, var(--cyan) 12%, transparent), transparent 62%),
		color-mix(in srgb, var(--panel) 76%, transparent);
	position: relative;
	overflow: hidden;
}

.cta h2 {
	margin-bottom: 0.5rem;
}

.cta p {
	color: var(--muted);
	max-width: 52ch;
	margin-inline: auto;
}

.cta .hero-cta {
	justify-content: center;
	margin-bottom: 0;
}

footer {
	border-top: 1px solid var(--line);
	padding-block: 2.6rem 3rem;
	color: var(--dim);
	font-size: 0.9rem;
	background: color-mix(in srgb, var(--bg-2) 60%, transparent);
}

.foot-grid {
	display: grid;
	grid-template-columns: minmax(0, 1.4fr) repeat(auto-fit, minmax(9rem, 1fr));
	gap: 2rem;
	margin-bottom: 2.2rem;
}

footer h4 {
	font-size: 0.72rem;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--muted);
	margin-bottom: 0.8rem;
}

footer ul {
	list-style: none;
	margin: 0;
	padding: 0;
	display: grid;
	gap: 0.45rem;
}

footer ul a {
	color: var(--dim);
	text-decoration: none;
}

footer ul a:hover {
	color: var(--cyan);
}

.foot-bottom {
	display: flex;
	flex-wrap: wrap;
	gap: 0.6rem 1.4rem;
	align-items: center;
	justify-content: space-between;
	padding-top: 1.6rem;
	border-top: 1px solid var(--line);
	font-size: 0.85rem;
}

/* ------------------------------------------------------------- reveals */

.js .reveal {
	opacity: 0;
	transform: translateY(18px);
	transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.js .reveal.in {
	opacity: 1;
	transform: none;
}

.js .reveal-stagger > * {
	opacity: 0;
	transform: translateY(16px);
	transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
	transition-delay: calc(var(--i, 0) * 70ms);
}

.js .reveal-stagger.in > * {
	opacity: 1;
	transform: none;
}

/* Motion is decoration. If it is unwelcome, none of it is required to read
 * the page -- so all of it goes, including the WebGL loop (see main.js). */
@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
	}

	.js .reveal,
	.js .reveal-stagger > * {
		opacity: 1;
		transform: none;
	}

	.meter i {
		width: var(--w, 60%);
	}
}

@media print {
	body::before,
	body::after,
	.nav,
	.demo,
	.cta {
		display: none;
	}

	body {
		background: #fff;
		color: #000;
	}
}