body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background-color: #f9f9f9; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        .header { background-color: #FF5722; color: white; padding: 15px; text-align: center; font-size: 24px; font-weight: bold; }
        .nav { background-color: #333; overflow: hidden; }
        .nav a { color: white; padding: 14px 20px; text-decoration: none; display: block; }
        .nav .icon { display: none; }
        .mobile-menu-btn { background: none; border: none; color: white; font-size: 20px; cursor: pointer; display: none; }
        .content { padding: 20px 0; }
        .download-btn { background-color: #4CAF50; color: white; padding: 10px 20px; text-align: center; display: inline-block; margin: 10px 0; border-radius: 5px; }
        .login-btn { background-color: #2196F3; color: white; padding: 10px 20px; text-align: center; display: inline-block; margin: 10px 0; border-radius: 5px; }
        .footer { background-color: #333; color: white; text-align: center; padding: 10px; }
        img { max-width: 100%; height: auto; margin: 15px 0; }
        @media screen and (max-width: 600px) {
            .nav a:not(:first-child) { display: none; }
            .nav a.icon { display: block; }
            .mobile-menu-btn { display: block; float: right; }
            .nav.responsive { position: relative; }
            .nav.responsive .icon { position: absolute; right: 0; top: 0; }
            .nav.responsive a { float: none; display: block; text-align: left; }
        }