:root { --fg: #1d1d1f; --muted: #666; --bg: #f6f7f9; --card: #fff; --accent: #2a6df4; --line: #e3e5e8; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #eee; --muted: #a0a0a8; --bg: #121214; --card: #1c1c20; --accent: #6d9bff; --line: #2c2c32; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--fg); background: var(--bg); }
.top, main, .bottom { max-width: 760px; margin: 0 auto; padding: 16px; }
.top { display: flex; justify-content: space-between; align-items: center; gap: 16px; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
nav a { margin-left: 16px; color: var(--accent); text-decoration: none; }
nav a:hover, .brand:hover { text-decoration: underline; }
.bottom { color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }

.hero { padding: 48px 0 24px; }
.hero h1 { margin: 0 0 8px; font-size: clamp(2rem, 6vw, 2.75rem); line-height: 1.15; }
.lead { margin: 0; max-width: 56ch; font-size: 1.15rem; color: var(--muted); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; padding-bottom: 48px; }
.card { display: block; padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: inherit; text-decoration: none; }
.card:hover, .card:focus-visible { border-color: var(--accent); }
.card h2 { margin: 0 0 4px; font-size: 1.1rem; color: var(--accent); }
.card p { margin: 0; color: var(--muted); }