body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; background: #ff9900; color: white; padding: 10px; text-align: center; cursor: pointer; }
        .header { background: #ff6600; color: white; padding: 20px; text-align: center; position: relative; }
        .header h1 { margin: 0; font-size: 2.5em; }
        .nav { background: #333; overflow: hidden; }
        .nav a { float: left; display: block; color: white; text-align: center; padding: 14px 16px; text-decoration: none; }
        .nav a:hover { background: #ddd; color: black; }
        .content { padding: 20px 0; }
        .download-btn, .login-btn { display: inline-block; padding: 12px 24px; margin: 10px 0; background: #4CAF50; color: white; text-decoration: none; border-radius: 5px; }
        .login-btn { background: #2196F3; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { background: #333; color: white; text-align: center; padding: 20px; }
        @media (max-width: 768px) {
            .nav a { float: none; display: block; }
            .mobile-nav { display: block; }
            .nav.responsive { display: block; }
            .nav { display: none; }
        }