:root {
	--bg: #f4f6fb;
	--panel: #ffffff;
	--ink: #1c2430;
	--muted: #5b677a;
	--line: #e4e9f2;
	--accent: #0073ee;
	--accent-2: #0b5ed7;
	--sidebar: #101826;
	--sidebar-ink: #d7deea;
	--sidebar-muted: #8b97ab;
	--code-bg: #0f1724;
	--ok: #0f7b4a;
	--warn: #9a6700;
	--note: #0858c5;
	--radius: 14px;
	--shadow: 0 10px 30px rgba(16, 24, 38, 0.08);
	--font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
	font-family: var(--font);
	background: var(--bg);
	color: var(--ink);
	line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.layout { display: grid; grid-template-columns: 300px 1fr; min-height: 100vh; }
.sidebar {
	background: var(--sidebar);
	color: var(--sidebar-ink);
	padding: 22px 0 40px;
	position: sticky;
	top: 0;
	height: 100vh;
	overflow: auto;
}
.brand { padding: 6px 22px 18px; border-bottom: 1px solid rgba(255,255,255,.08); margin-bottom: 12px; }
.brand small { display: block; color: var(--sidebar-muted); letter-spacing: .08em; text-transform: uppercase; font-size: 11px; }
.brand strong { display: block; font-size: 16px; margin-top: 4px; color: #fff; }
.nav-group { padding: 10px 0 4px; }
.nav-group h2 {
	margin: 0;
	padding: 10px 22px 6px;
	font-size: 11px;
	text-transform: uppercase;
	letter-spacing: .08em;
	color: var(--sidebar-muted);
	font-weight: 700;
}
.nav-group a {
	display: block;
	color: var(--sidebar-ink);
	padding: 7px 22px;
	font-size: 13.5px;
	border-left: 3px solid transparent;
}
.nav-group a:hover, .nav-group a.is-active {
	background: rgba(255,255,255,.05);
	text-decoration: none;
	color: #fff;
}
.nav-group a.is-active { border-left-color: var(--accent); }
.content { padding: 28px 40px 80px; max-width: 980px; }
.topbar {
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 16px;
	margin-bottom: 22px;
}
.crumb { color: var(--muted); font-size: 13px; }
.menu-btn {
	display: none;
	border: 0;
	background: var(--accent);
	color: #fff;
	border-radius: 8px;
	padding: 8px 12px;
	cursor: pointer;
}
.card {
	background: var(--panel);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
	padding: 34px 40px 48px;
}
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 22px; margin: 36px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
h2:first-of-type { border-top: 0; padding-top: 0; }
h3 { font-size: 18px; margin: 28px 0 8px; }
h4 { font-size: 15px; margin: 20px 0 6px; }
p, li { font-size: 15px; }
.card > p:first-of-type { font-size: 16px; color: #334155; }
.card p > strong:first-child {
	display: block;
	font-size: 12px;
	letter-spacing: .04em;
	text-transform: uppercase;
	color: #445066;
	margin-bottom: 4px;
}
hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
code {
	font-family: Consolas, "Courier New", monospace;
	background: #eef3fb;
	padding: 1px 6px;
	border-radius: 5px;
	font-size: 13px;
}
pre {
	background: var(--code-bg);
	color: #e8eef8;
	padding: 16px 18px;
	border-radius: 10px;
	overflow: auto;
}
pre code { background: transparent; color: inherit; padding: 0; }
blockquote {
	margin: 16px 0;
	padding: 12px 16px;
	border-left: 4px solid var(--accent);
	background: #edf5ff;
	border-radius: 0 10px 10px 0;
	color: #1e3a5f;
}
table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: #f3f7fd; }
tr:nth-child(even) td { background: #fafcff; }
.note, .warn {
	padding: 12px 14px;
	border-radius: 10px;
	margin: 16px 0;
}
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
.footer-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; }
.footer-nav a {
	background: #fff;
	border: 1px solid var(--line);
	padding: 12px 16px;
	border-radius: 10px;
	color: var(--ink);
	flex: 1;
}
.footer-nav a:hover { border-color: var(--accent); text-decoration: none; }
.footer-nav span { display: block; color: var(--muted); font-size: 12px; }
@media (max-width: 980px) {
	.layout { grid-template-columns: 1fr; }
	.sidebar { display: none; position: fixed; z-index: 20; width: min(86vw, 320px); }
	.sidebar.is-open { display: block; }
	.menu-btn { display: inline-block; }
	.content { padding: 18px 16px 50px; }
	.card { padding: 22px 18px 32px; }
}