body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; background: #2c3e50; color: white; padding: 10px; text-align: center; }
        .logo { font-size: 28px; font-weight: bold; color: #e74c3c; margin-bottom: 20px; text-align: center; }
        nav { background: #34495e; padding: 15px; }
        nav a { color: white; margin: 0 15px; text-decoration: none; }
        h1 { color: #e74c3c; border-bottom: 3px solid #3498db; padding-bottom: 10px; }
        h2 { color: #2980b9; margin-top: 30px; }
        h3 { color: #16a085; }
        .btn { display: inline-block; background: #e74c3c; color: white; padding: 10px 20px; margin: 10px 0; border-radius: 5px; text-decoration: none; }
        .img-container { text-align: center; margin: 20px 0; }
        img { max-width: 100%; height: auto; }
        .download-section, .login-section { background: #f9f9f9; padding: 20px; margin: 20px 0; border-left: 5px solid #3498db; }
        footer { background: #2c3e50; color: white; padding: 20px; text-align: center; margin-top: 40px; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; }
            .logo { font-size: 24px; }
        }