:root {
	--bg: #f4f7f6;
	--ink: #10201f;
	--ink-soft: #4d5f5d;
	--rule: #d3dedc;
	--teal: #0a756f;
	--card: #fbfdfc;
	--bar: rgba(246, 249, 248, 0.82);
	--bar-ink: #1a1a1a;
	--menu: rgba(250, 251, 251, 0.94);
	--radius: 14px;
	--max: 1080px;
	--sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", system-ui, sans-serif;
	--mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
	color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #0c1413;
		--ink: #e6efed;
		--ink-soft: #9fb1ae;
		--rule: #24302e;
		--teal: #3cc4bb;
		--card: #111a19;
		--bar: rgba(30, 36, 36, 0.86);
		--bar-ink: #f2f2f2;
		--menu: rgba(38, 44, 44, 0.96);
	}
}

* {
	box-sizing: border-box;
}

html {
	-webkit-text-size-adjust: 100%;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--ink);
	font: 400 17px / 1.6 var(--sans);
	-webkit-font-smoothing: antialiased;
	overflow-x: clip;
}

a {
	color: inherit;
	text-decoration-color: var(--teal);
	text-underline-offset: 3px;
}
a:hover {
	color: var(--teal);
}
:focus-visible {
	outline: 2px solid var(--teal);
	outline-offset: 3px;
	border-radius: 4px;
}

.wrap {
	max-width: var(--max);
	margin: 0 auto;
	padding: 0 20px;
}

/* Header */
.site-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding-block: 22px;
}
.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	text-decoration: none;
	font: 650 20px / 1 var(--sans);
	letter-spacing: -0.01em;
}
.brand:hover {
	color: inherit;
}
.brand img {
	width: 34px;
	height: 34px;
}
.nav {
	display: flex;
	gap: 22px;
	font-size: 15px;
}
.nav a {
	text-decoration: none;
	color: var(--ink-soft);
	/* 44pt tap targets without moving the text */
	padding-block: 10px;
	margin-block: -10px;
}
.nav a:hover,
.nav a[aria-current] {
	color: var(--ink);
}
.nav a[aria-current] {
	text-decoration: underline;
	text-decoration-color: var(--teal);
}

/* Hero */
.hero {
	padding-block: 48px 72px;
	text-align: center;
}
.eyebrow {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-size: 13px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--ink-soft);
}
.eyebrow::before {
	content: "";
	width: 8px;
	height: 8px;
	border-radius: 50%;
	background: var(--teal);
}
h1 {
	font: 700 clamp(40px, 6.4vw, 68px) / 1.04 var(--sans);
	letter-spacing: -0.03em;
	margin: 18px 0 20px;
	text-wrap: balance;
}
h1 em {
	font-style: normal;
	color: var(--teal);
}
.lede {
	font-size: 19px;
	color: var(--ink-soft);
	max-width: 40ch;
	margin: 0 auto 30px;
}
.cta {
	display: flex;
	flex-wrap: wrap;
	gap: 12px 18px;
	align-items: center;
	justify-content: center;
}
.soon {
	font-size: 15px;
	font-weight: 600;
}
.ghost {
	font-size: 15px;
	color: var(--ink-soft);
	/* 44pt tap target without moving the text */
	display: inline-block;
	padding-block: 10px;
	margin-block: -10px;
}

/* The menu bar picture: plain text in the system's monospaced font, as Gaugebar draws it. */
.desk {
	position: relative;
	margin: 56px auto 0;
	max-width: 860px;
	min-height: 330px;
	border-radius: 18px;
	overflow: hidden;
	background:
		radial-gradient(120% 90% at 20% 0%, #5cc8bd 0%, transparent 60%),
		radial-gradient(100% 90% at 100% 100%, #2a6f9e 0%, transparent 65%),
		#1f8f87;
	box-shadow:
		0 1px 0 rgba(0, 0, 0, 0.03),
		0 30px 60px -30px rgba(0, 0, 0, 0.45);
	text-align: left;
}
.menubar {
	display: flex;
	justify-content: flex-end;
	align-items: center;
	height: 30px;
	padding: 0 14px;
	background: var(--bar);
	color: var(--bar-ink);
	backdrop-filter: blur(20px);
	-webkit-backdrop-filter: blur(20px);
	font: 400 13px / 30px var(--mono);
	white-space: pre;
}
.menubar .item {
	padding: 0 10px;
	border-radius: 5px;
}
.menubar .item.open {
	position: relative;
	background: rgba(127, 127, 127, 0.28);
}
.menubar .clock {
	font-family: var(--sans);
	padding-left: 12px;
}
.menu {
	position: absolute;
	top: 32px;
	left: -4px;
	width: 236px;
	margin: 0;
	white-space: normal;
	padding: 5px;
	border-radius: 10px;
	background: var(--menu);
	color: var(--bar-ink);
	backdrop-filter: blur(24px);
	-webkit-backdrop-filter: blur(24px);
	box-shadow:
		0 0 0 0.5px rgba(0, 0, 0, 0.25),
		0 14px 34px rgba(0, 0, 0, 0.28);
	font: 400 13px / 1 var(--sans);
}
.menu li {
	list-style: none;
	display: flex;
	justify-content: space-between;
	padding: 4px 10px 4px 22px;
	border-radius: 5px;
	position: relative;
	line-height: 1.4;
}
.menu li.on::before {
	content: "✓";
	position: absolute;
	left: 7px;
	font-size: 12px;
}
.menu li.sep {
	height: 1px;
	padding: 0;
	margin: 5px 10px;
	background: rgba(127, 127, 127, 0.35);
}
.menu .key,
.menu .more {
	opacity: 0.55;
}

/* Sections */
section {
	padding-block: 72px;
	border-top: 1px solid var(--rule);
}
.kicker {
	font-size: 13px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--teal);
	margin: 0 0 10px;
}
h2 {
	font: 700 clamp(28px, 4vw, 40px) / 1.1 var(--sans);
	letter-spacing: -0.02em;
	margin: 0 0 16px;
}
.sub {
	color: var(--ink-soft);
	max-width: 56ch;
	margin: 0 0 40px;
}

.readings {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 18px;
}
.reading {
	background: var(--card);
	border: 1px solid var(--rule);
	border-radius: var(--radius);
	padding: 24px;
}
.reading code {
	display: block;
	font: 500 15px / 1.3 var(--mono);
	color: var(--teal);
	white-space: pre;
	margin-bottom: 14px;
}
.reading h3 {
	font: 650 19px / 1.2 var(--sans);
	margin: 0 0 8px;
}
.reading p {
	margin: 0;
	color: var(--ink-soft);
	font-size: 15.5px;
}

.principles {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 28px;
	margin-top: 32px;
}
.principles h3 {
	font: 650 18px / 1.3 var(--sans);
	margin: 0 0 6px;
}
.principles p {
	margin: 0;
	color: var(--ink-soft);
	font-size: 15.5px;
}

/* Footer */
.site-footer {
	border-top: 1px solid var(--rule);
	padding: 32px 0 48px;
	font-size: 14px;
	color: var(--ink-soft);
}
.site-footer .wrap {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	gap: 16px;
}
.site-footer nav {
	display: flex;
	gap: 20px;
}
.site-footer a {
	text-decoration: none;
}
.site-footer nav a {
	padding-block: 11px;
	margin-block: -11px;
}

/* Document pages (privacy, support, 404) */
.doc {
	max-width: 720px;
	padding: 40px 0 80px;
}
.doc h1 {
	font-size: clamp(36px, 5vw, 52px);
	margin: 8px 0 10px;
}
.doc .meta {
	color: var(--ink-soft);
	font-size: 14px;
	margin: 0 0 36px;
}
.doc h2 {
	font-size: 24px;
	margin: 40px 0 10px;
}
.doc ul {
	padding-left: 20px;
}
.doc li {
	margin: 6px 0;
}
.doc code {
	font: 500 0.92em var(--mono);
}
.callout {
	background: color-mix(in srgb, var(--teal) 8%, var(--card));
	border: 1px solid color-mix(in srgb, var(--teal) 30%, var(--rule));
	border-radius: 10px;
	padding: 18px 20px;
	margin: 24px 0;
}
.faq details {
	border-bottom: 1px solid var(--rule);
}
/* The whole row is the tap target, with the +/– on the first line of a long question. */
.faq summary {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	padding: 16px 0;
	cursor: pointer;
	font: 650 18px / 1.4 var(--sans);
	list-style: none;
}
.faq summary::-webkit-details-marker {
	display: none;
}
.faq summary::after {
	content: "+";
	content: "+" / "";
	flex: none;
	color: var(--teal);
}
.faq details[open] summary::after {
	content: "–";
	content: "–" / "";
}
.faq details p {
	color: var(--ink-soft);
	margin: -6px 0 16px;
}

@media (max-width: 860px) {
	.readings {
		grid-template-columns: 1fr 1fr;
	}
	.principles {
		grid-template-columns: 1fr;
	}
	.nav {
		gap: 16px;
	}
	/* Narrow screens start the menu bar at the left and drop the clock; the narrowest drop network and disk too. */
	.menubar {
		justify-content: flex-start;
	}
	.menubar .clock {
		display: none;
	}
}

@media (max-width: 560px) {
	.readings {
		grid-template-columns: 1fr;
	}
	.menubar .item.extra {
		display: none;
	}
	/* With only CPU and RAM left, sit them at the right like real items, and open the menu leftwards to stay inside the picture. */
	.menubar {
		justify-content: flex-end;
	}
	.menu {
		left: auto;
		right: -4px;
	}
}