body { font-family: -apple-system, Helvetica, Arial, sans-serif; max-width: 720px; margin: 40px auto; padding: 0 20px; color: #1a1a1a; line-height: 1.6; }
header { border-bottom: 1px solid #ddd; margin-bottom: 24px; padding-bottom: 12px; }
nav a { margin-right: 16px; text-decoration: none; color: #1a3a6b; font-weight: 600; }
h1 { margin: 0 0 8px 0; }