:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fafafa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eaeaea;
    --bg: #121212;
  }
}
html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  max-width: 40rem;
  margin: 4rem auto;
  padding: 0 1.25rem;
}
h1 {
  font-weight: 600;
  letter-spacing: -0.02em;
}