body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}
h1 { font-size: 1.8rem; }
h2 { font-size: 1.3rem; margin-top: 2rem; }
a { color: #0066cc; }
.updated { color: #666; font-size: 0.9rem; }