:root {
  --bg: #f8fafc;
  --fg: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

main.shell {
  max-width: 56rem;
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
}

h1 {
  margin: 0;
  font-size: 2.25rem;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  margin: 2rem 0 0.5rem;
  font-size: 1.5rem;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  margin: 1rem 0 0;
  color: var(--muted);
}

.version {
  margin-top: 1rem;
}

section.content {
  margin-top: 2rem;
}

@media (max-width: 640px) {
  main.shell {
    padding: 2.5rem 1rem;
  }

  h1 {
    font-size: 1.875rem;
  }

  h2 {
    font-size: 1.25rem;
  }
}