:root {
  color-scheme: light dark;
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #57534e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --fg: #f5f5f4;
    --muted: #a8a29e;
  }
}
html, body { height: 100%; margin: 0; }
body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  box-sizing: border-box;
  background: var(--bg);
  color: var(--fg);
  font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  text-align: center;
}
h1 { font-size: 1.5rem; font-weight: 600; margin: 0 0 0.5rem; }
p { margin: 0.25rem 0 0; color: var(--muted); }