body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: #1a1a1a; line-height: 1.7; max-width: 720px; margin: 0 auto; padding: 40px 20px; }
h1 { font-size: 28px; margin-bottom: 8px; }
h2 { font-size: 20px; margin-top: 32px; }
a { color: #2563eb; }
.intro { color: #555; margin-bottom: 32px; }
.footer { margin-top: 48px; font-size: 14px; color: #888; border-top: 1px solid #eee; padding-top: 16px; }