body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background: #f5f5f5; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; background: #003366; color: white; padding: 10px; text-align: center; }
            .mobile-nav button { background: #ff9900; border: none; color: white; padding: 8px 15px; cursor: pointer; }
        }
        h1 { color: #003366; text-align: center; margin-bottom: 30px; }
        h2 { color: #ff9900; border-bottom: 2px solid #ff9900; padding-bottom: 5px; margin-top: 25px; }
        h3 { color: #0066cc; }
        .logo { font-size: 28px; font-weight: bold; color: #ff9900; text-align: center; margin: 20px 0; }
        .download-btn, .login-btn { display: inline-block; background: #0066cc; color: white; padding: 12px 25px; margin: 15px 0; text-decoration: none; border-radius: 5px; }
        .login-btn { background: #ff9900; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .footer { background: #003366; color: white; text-align: center; padding: 20px; margin-top: 40px; }
        .tag-cloud { margin: 20px 0; text-align: center; }
        .tag-cloud a { color: #0066cc; margin: 0 10px; text-decoration: none; }