body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; background: #f5f5f5; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-menu { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-menu { display: block; }
        }
        h1 { color: #e74c3c; font-size: 2.5em; }
        h2 { color: #3498db; margin-top: 30px; }
        h3 { color: #2ecc71; }
        .download-btn { display: inline-block; padding: 12px 25px; background: #e74c3c; color: white; text-decoration: none; margin: 15px 0; border-radius: 5px; }
        .login-btn { display: inline-block; padding: 12px 25px; background: #3498db; color: white; text-decoration: none; margin: 15px 0; border-radius: 5px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tag { background: #f1c40f; padding: 3px 8px; border-radius: 3px; margin: 5px; display: inline-block; }