:root {
  color-scheme: light dark;
  --fg: #111;
  --bg: #fafafa;
  --muted: #666;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f0f0f0;
    --bg: #111;
    --muted: #888;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 640px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}

h1 {
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  color: var(--muted);
}