body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; max-width: 720px; margin: 2rem auto; padding: 0 1rem; color: #222; line-height: 1.6; }
h1 { color: #2563eb; border-bottom: 2px solid #2563eb; padding-bottom: 0.5rem; }
h2 { color: #1f2937; margin-top: 2rem; }
section { background: #f9fafb; padding: 1rem 1.5rem; border-radius: 8px; margin: 1rem 0; }
img { max-width: 100%; height: auto; border: 1px solid #e5e7eb; border-radius: 4px; }
a { color: #2563eb; }
footer { margin-top: 3rem; color: #6b7280; }