:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --text: #0f172a;
  --muted: #475569;
  --font: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --text: #e2e8f0;
    --muted: #94a3b8;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.45;
}
main { width: min(100%, 28rem); text-align: center; }
h1 { margin: 0; font-size: clamp(1.8rem, 6vw, 2.6rem); letter-spacing: -0.03em; overflow-wrap: anywhere; }
p { margin: 8px 0 0; color: var(--muted); font-size: 1.05rem; }