body { font-family: system-ui, -apple-system, "Segoe UI", sans-serif; max-width: 720px; margin: 40px auto; padding: 0 20px; line-height: 1.6; color: #1f2937; }
h1, h2, h3 { color: #0f766e; }
a { color: #0f766e; }
code { background: #f1f5f9; padding: 0 4px; border-radius: 3px; }
footer { margin-top: 48px; font-size: 0.9em; color: #64748b; }