:root {
  color-scheme: light;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #0f766e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(160deg, #f8fafc 0%, #ecfeff 100%);
  color: var(--text);
}

main {
  max-width: 880px;
  margin: 2rem auto;
  padding: 0 1rem 2rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.25rem;
}

h1, h2 {
  margin-top: 0;
}

h1 {
  font-size: 1.65rem;
}

h2 {
  font-size: 1.1rem;
  margin-top: 1.4rem;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

small {
  color: #64748b;
}