/* Pi Desktop site — workshop paper on a cool well. Tokens follow the app. */

:root {
	--well: #0a0a0a;
	--graphite: #141414;
	--plate: #212121;
	--paper: #f3f1ec;
	--muted: color-mix(in oklab, var(--paper) 58%, transparent);
	--faint: color-mix(in oklab, var(--paper) 38%, transparent);
	--line: color-mix(in oklab, var(--paper) 10%, transparent);
	--line-strong: color-mix(in oklab, var(--paper) 16%, transparent);
	--hover: color-mix(in oklab, var(--paper) 6%, transparent);
	--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
		"Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
		system-ui, sans-serif;
	--mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas,
		"Liberation Mono", monospace;
	--content: 1080px;
	--prose: 62ch;
}

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

html {
	background: var(--well);
	color: var(--paper);
	font-family: var(--sans);
	font-size: 16px;
	line-height: 1.5;
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
}

body {
	margin: 0;
	min-height: 100vh;
	background:
		radial-gradient(1200px 480px at 12% -10%, color-mix(in oklab, var(--paper) 5%, transparent), transparent 70%),
		var(--well);
}

[data-lang="zh"] .en {
	display: none;
}

[data-lang="en"] .zh {
	display: none;
}

a {
	color: inherit;
	text-decoration-thickness: 1px;
	text-underline-offset: 0.18em;
	text-decoration-color: color-mix(in oklab, var(--paper) 35%, transparent);
}

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

:focus-visible {
	outline: 2px solid var(--paper);
	outline-offset: 3px;
}

.wrap {
	width: min(var(--content), calc(100% - 48px));
	margin-inline: auto;
}

.top {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding: 22px 0 18px;
	border-bottom: 1px solid var(--line);
}

.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	text-decoration: none;
	font-weight: 560;
	letter-spacing: -0.02em;
}

.brand svg {
	display: block;
}

.nav {
	display: flex;
	align-items: center;
	gap: 18px;
	color: var(--muted);
	font-size: 14px;
}

.nav a {
	text-decoration: none;
}

.nav a:hover {
	color: var(--paper);
}

.lang {
	appearance: none;
	border: 1px solid var(--line-strong);
	background: transparent;
	color: var(--paper);
	font: inherit;
	font-size: 13px;
	padding: 5px 10px;
	border-radius: 999px;
	cursor: pointer;
}

.lang:hover {
	background: var(--hover);
}

.hero {
	display: grid;
	grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
	gap: 56px;
	align-items: end;
	padding: 72px 0 64px;
}

.hero h1 {
	margin: 0 0 18px;
	font-size: clamp(2.4rem, 4.6vw, 3.6rem);
	font-weight: 520;
	letter-spacing: -0.045em;
	line-height: 1.12;
	max-width: 18em;
}

.lede {
	margin: 0;
	max-width: var(--prose);
	color: var(--muted);
	font-size: 1.05rem;
	line-height: 1.65;
}

.actions {
	display: flex;
	flex-wrap: wrap;
	gap: 10px;
	margin-top: 28px;
}

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 40px;
	padding: 0 16px;
	border-radius: 999px;
	font-size: 14px;
	font-weight: 520;
	text-decoration: none;
	border: 1px solid transparent;
}

.btn-fill {
	background: var(--paper);
	color: var(--well);
}

.btn-fill:hover {
	background: color-mix(in oklab, var(--paper) 88%, white);
}

.btn-ghost {
	border-color: var(--line-strong);
	color: var(--paper);
}

.btn-ghost:hover {
	background: var(--hover);
}

.meta {
	margin: 22px 0 0;
	color: var(--faint);
	font-family: var(--mono);
	font-size: 12px;
}

.schematic {
	border: 1px solid var(--line);
	background: var(--graphite);
	padding: 18px;
	border-radius: 16px;
}

.plate {
	border: 1px solid var(--line-strong);
	background: color-mix(in oklab, var(--paper) 3.5%, transparent);
	border-radius: 12px;
	padding: 14px 16px;
}

.plate strong {
	display: block;
	font-size: 14px;
	font-weight: 560;
	letter-spacing: -0.02em;
}

.plate span {
	display: block;
	margin-top: 4px;
	color: var(--muted);
	font-size: 13px;
}

.spine {
	width: 1px;
	height: 18px;
	margin-left: 22px;
	background: var(--line-strong);
}

.spine-label {
	margin: 6px 0 6px 22px;
	color: var(--faint);
	font-family: var(--mono);
	font-size: 11px;
}

.section {
	padding: 56px 0;
	border-top: 1px solid var(--line);
}

.section h2 {
	margin: 0 0 8px;
	font-size: 1.35rem;
	font-weight: 560;
	letter-spacing: -0.03em;
}

.section > p {
	margin: 0 0 28px;
	max-width: var(--prose);
	color: var(--muted);
}

.pairs {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 0;
	border-top: 1px solid var(--line);
}

.pairs > div {
	padding: 20px 24px 20px 0;
	border-bottom: 1px solid var(--line);
}

.pairs h3 {
	margin: 0 0 8px;
	font-size: 15px;
	font-weight: 560;
	letter-spacing: -0.02em;
}

.pairs p,
.pairs ul {
	margin: 0;
	color: var(--muted);
	font-size: 14px;
}

.pairs ul {
	padding-left: 1.1em;
}

.pairs li + li {
	margin-top: 4px;
}

.brief {
	max-width: 72ch;
}

.brief p {
	margin: 0 0 12px;
	color: var(--muted);
}

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

.dl {
	display: grid;
	grid-template-columns: 140px 1fr;
	gap: 12px 24px;
	max-width: 72ch;
	font-size: 14px;
}

.dl dt {
	color: var(--faint);
	font-family: var(--mono);
	font-size: 12px;
	padding-top: 2px;
}

.dl dd {
	margin: 0;
	color: var(--muted);
}

pre {
	margin: 0;
	padding: 18px 20px;
	background: var(--graphite);
	border: 1px solid var(--line);
	border-radius: 12px;
	overflow-x: auto;
	font-family: var(--mono);
	font-size: 13px;
	line-height: 1.55;
	color: var(--paper);
}

.foot {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	gap: 12px;
	padding: 28px 0 48px;
	border-top: 1px solid var(--line);
	color: var(--faint);
	font-size: 13px;
}

.foot a {
	color: var(--muted);
	text-decoration: none;
}

.foot a:hover {
	color: var(--paper);
}

@media (max-width: 840px) {
	.hero {
		grid-template-columns: 1fr;
		gap: 36px;
		padding: 48px 0 40px;
	}

	.hero h1 {
		max-width: none;
	}

	.pairs {
		grid-template-columns: 1fr;
	}

	.dl {
		grid-template-columns: 1fr;
		gap: 4px;
	}

	.dl dt {
		padding-top: 12px;
	}

	.top {
		flex-wrap: wrap;
	}
}

@media (prefers-reduced-motion: reduce) {
	* {
		scroll-behavior: auto !important;
		transition: none !important;
		animation: none !important;
	}
}