:root {
	--text: #1f2933;
	--muted: #616e7c;
	--accent: #b3541e;
	--border: #e4e7eb;
	--bg-soft: #f8f9fa;
	--code-bg: #f0f2f5;
	--code-text: #d63384;
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	min-height: 100vh;
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	color: var(--text);
	line-height: 1.65;

	display: grid;
	grid-template-columns:
		minmax(1.5rem, 1fr)
		14rem
		minmax(0, 62rem)
		minmax(1.5rem, 1fr);
	grid-template-areas:
		"header header header header"
		"lead   nav    main   trail"
		"footer footer footer footer";
	column-gap: 2.5rem;
}

.site-header {
	grid-area: header;
	position: sticky;
	top: 0;
	z-index: 10;
	height: 4.5rem;
	background: #fff;
	display: flex;
	align-items: baseline;
	gap: 1rem;
	padding: 1rem 1.5rem;
	border-bottom: 1px solid var(--border);
}

.brand {
	font-size: 1.35rem;
	font-weight: 700;
	color: var(--accent);
	text-decoration: none;
}

.tagline {
	color: var(--muted);
	font-size: 0.9rem;
}

.sidebar {
	grid-area: nav;
	position: sticky;
	top: 4.5rem;
	align-self: start;
	padding-block: 1.5rem;
}

.sidebar ul {
	list-style: none;
	margin: 0;
	padding: 0;
	border-right: 1px solid var(--border);
}

.sidebar a {
	display: block;
	padding: 0.4rem 0.75rem;
	color: var(--text);
	text-decoration: none;
	border-radius: 4px;
}

.sidebar a:hover,
.sidebar a.current {
	background: var(--bg-soft);
	color: var(--accent);
}

.content {
	grid-area: main;
	min-width: 0;
	max-width: 46rem;
	padding-block: 1.5rem;
}

.content h1 {
	border-bottom: 1px solid var(--border);
	padding-bottom: 0.4rem;
}

.content h2,
.content h3 {
	margin-top: 2rem;
}

.content a {
	color: var(--accent);
}

.content code {
	background: var(--code-bg);
	color: var(--code-text);
	padding: 0.15em 0.4em;
	border-radius: 4px;
	font-size: 0.9em;
}

.content pre {
	background: var(--bg-soft);
	border: 1px solid var(--border);
	border-radius: 6px;
	padding: 1rem;
	overflow-x: auto;
	line-height: 1.5;
}

.content pre code {
	background: none;
	color: inherit;
	padding: 0;
	font-size: 0.875em;
}

.content blockquote {
	margin: 0;
	padding: 0.5rem 1rem;
	border-left: 3px solid var(--accent);
	color: var(--muted);
	background: var(--bg-soft);
}

.content table {
	border-collapse: collapse;
	width: 100%;
}

.content th,
.content td {
	border: 1px solid var(--border);
	padding: 0.45rem 0.75rem;
	text-align: left;
}

.content th {
	background: var(--bg-soft);
}

.site-footer {
	grid-area: footer;
	padding: 1rem 1.5rem;
	border-top: 1px solid var(--border);
	color: var(--muted);
	font-size: 0.85rem;
}

@media (max-width: 50rem) {
	body {
		grid-template-columns: 1fr;
		grid-template-areas:
			"header"
			"nav"
			"main"
			"footer";
		column-gap: 0;
	}

	.sidebar {
		position: static;
		padding: 1rem 1.5rem 0;
	}

	.content {
		padding-inline: 1.5rem;
	}

	.sidebar ul {
		border-right: none;
		display: flex;
		flex-wrap: wrap;
		gap: 0.25rem;
	}
}