:root {
  --bg: #fafaf9;
  --text: #1c1917;
  --muted: #57534e;
  --accent: #1d4ed8;
  --rule: #e7e5e4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --text: #f5f5f4;
    --muted: #a8a29e;
    --accent: #93c5fd;
    --rule: #44403c;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main, footer {
  width: 100%;
  max-width: 40rem;
  margin: 0 auto;
  padding: 0 1rem;
}

main { flex: 1; padding-top: 4rem; }

h1 { font-size: 2.25rem; line-height: 1.2; margin: 0 0 1rem; }

h2 {
  font-size: 1.1rem;
  margin: 2.5rem 0 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.lead { font-size: 1.2rem; color: var(--muted); margin: 0; }

a { color: var(--accent); }

footer { padding-top: 2rem; padding-bottom: 2rem; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 480px) {
  main { padding-top: 2.5rem; }
  h1 { font-size: 1.8rem; }
}