:root {
	--bg: #f4f6fa;
	--surface: #fff;
	--fg: #1b2430;
	--muted: #6b7a90;
	--line: #dde3ec;
	--accent: #2f6df6;
}

* { box-sizing: border-box; }

body {
	margin: 0;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	background: var(--bg);
	color: var(--fg);
	font: 15px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

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

/* ---------- header ---------- */

.site-header {
	background: var(--surface);
	border-bottom: 1px solid var(--line);
}

.site-header .inner {
	max-width: 880px;
	margin: 0 auto;
	padding: 14px 16px;
	display: flex;
	align-items: center;
	gap: 20px;
	flex-wrap: wrap;
}

.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	font-weight: 700;
	font-size: 16px;
	letter-spacing: -.01em;
	color: var(--fg);
	text-decoration: none;
}

.brand img { width: 30px; height: 30px; }

.site-nav {
	display: flex;
	gap: 18px;
	flex-wrap: wrap;
	margin-left: auto;
	font-size: 14px;
}

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

.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }

/* ---------- content ---------- */

main {
	flex: 1;
	width: 100%;
	max-width: 880px;
	margin: 0 auto;
	padding: 28px 16px 40px;
}

.card {
	background: var(--surface);
	border: 1px solid var(--line);
	border-radius: 14px;
	padding: 28px;
}

.card + .card { margin-top: 20px; }

h1 {
	margin: 0 0 6px;
	font-size: 27px;
	letter-spacing: -.02em;
}

h2 {
	margin: 26px 0 8px;
	font-size: 18px;
	letter-spacing: -.01em;
}

p { margin: 0 0 12px; }
.lead { color: var(--muted); }
.placeholder { color: var(--muted); font-size: 14px; }

ul.plain { margin: 0 0 12px; padding-left: 20px; }
ul.plain li { margin-bottom: 6px; }

/* ---------- footer ---------- */

.site-footer {
	background: var(--surface);
	border-top: 1px solid var(--line);
	font-size: 13px;
	color: var(--muted);
}

.site-footer .inner {
	max-width: 880px;
	margin: 0 auto;
	padding: 18px 16px 26px;
}

.site-footer nav {
	display: flex;
	gap: 16px;
	flex-wrap: wrap;
	margin-bottom: 10px;
}

.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

@media (max-width: 560px) {
	.card { padding: 22px; }
	.site-nav { margin-left: 0; width: 100%; }
}