:root {
  --bg: #f6f7fb; --surface: #fff; --text: #1b1f2a; --muted: #5d6578;
  --border: #e3e6ef; --accent: #4f46e5;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1117; --surface: #181b24; --text: #e8eaf0; --muted: #9aa2b5; --border: #2a2f3c; --accent: #8b85ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
header, main { max-width: 960px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 40px; padding-bottom: 8px; }
h1 { margin: 0 0 8px; font-size: 32px; letter-spacing: -0.02em; }
header p { margin: 0 0 8px; color: var(--muted); max-width: 640px; }
a { color: var(--accent); }
.grid { list-style: none; padding: 0; margin: 24px 0 48px; display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card { display: flex; flex-direction: column; height: 100%; padding: 18px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); color: inherit; text-decoration: none; }
.card:hover { border-color: var(--accent); }
.card h2 { margin: 0 0 6px; font-size: 19px; }
.card p { margin: 0 0 14px; color: var(--muted); flex: 1; }
.card span { color: var(--accent); font-weight: 600; font-size: 14px; }