body { margin: 0; padding: 24px 16px; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: #ecfdf5; color: #111827; line-height: 1.6; }
main { max-width: 720px; margin: 0 auto; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; color: #065f46; }
a { color: #1d4ed8; }