:root { color-scheme: dark; --bg: #0b1016; --fg: #e6edf3; --muted: #8b98a5; --accent: #2ea0ff; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--bg); color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { flex: 1; max-width: 40rem; margin: 0 auto; padding: 4rem 1.5rem; }
h1 { font-size: 2.5rem; margin: 0 0 1rem; letter-spacing: .02em; }
.lead { font-size: 1.15rem; }
.note { color: var(--muted); font-size: .9rem; margin-top: 2rem; }
.btn { display: inline-block; padding: .75rem 1.25rem; border-radius: .5rem; background: var(--accent); color: #fff;
  text-decoration: none; font-weight: 600; }
a { color: var(--accent); }
footer { color: var(--muted); font-size: .8rem; text-align: center; padding: 1.5rem; }