:root {
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #78716c;
  --accent: #2563eb;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0c0a09; --fg: #f5f5f4; --muted: #a8a29e; --accent: #60a5fa; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  display: flex; flex-direction: column;
  background: var(--bg); color: var(--fg);
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { flex: 1; display: flex; flex-direction: column; justify-content: center;
  width: 100%; max-width: 40rem; margin: 0 auto; padding: 2rem 1rem; }
.mark { margin: 0 0 1.5rem; font-weight: 700; letter-spacing: -0.01em; }
h1 { margin: 0; font-size: clamp(2.5rem, 8vw, 4.5rem); line-height: 1.05; letter-spacing: -0.035em; }
.lede { margin: 1rem 0 0; color: var(--muted); font-size: 1.125rem; }
a { color: var(--accent); }
footer { padding: 1.5rem 1rem; text-align: center; color: var(--muted); font-size: 0.875rem; }