:root {
  color-scheme: light dark;
  --bg: #f4f4f4;
  --fg: #1a1a1a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #d0d0d0;
  }
}
html { background: var(--bg); }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, sans-serif;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}