body { font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; margin: 0; line-height: 1.6; }
header, footer { background: #f7f7f7; padding: 1rem; }
nav a { margin-right: .75rem; text-decoration: none; color: #0366d6; }
nav a:hover { text-decoration: underline; }
main { padding: 1rem; }
code { background: #f0f0f0; padding: 2px 4px; border-radius: 4px; }