:root { color-scheme: light dark; --bg: #f6f8f7; --fg: #0b1614; --accent: #0f766e; --muted: #d5dedb; }
@media (prefers-color-scheme: dark) { :root { --bg: #050e0d; --fg: #e8f0ee; --accent: #2dd4bf; --muted: #1f2d2a; } }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Tahoma, sans-serif; }
main { width: 100%; max-width: 420px; padding: 24px 16px; box-sizing: border-box; text-align: center; }
h1 { font-size: 28px; margin: 0 0 8px; }
nav { display: grid; gap: 12px; margin-top: 24px; }
a { display: block; padding: 14px; border-radius: 12px; border: 1px solid var(--muted); color: var(--fg); text-decoration: none; }
a.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); font-weight: 600; }