body { font-family: 'Arial', sans-serif; line-height: 1.6; max-width: 1200px; margin: 0 auto; padding: 20px; color: #333; }
        h1 { color: #FF5733; font-size: 2.5em; text-align: center; margin-bottom: 10px; }
        h2 { color: #33A1FF; font-size: 1.8em; margin-top: 30px; }
        h3 { color: #4CAF50; font-size: 1.4em; margin-top: 20px; }
        .logo { font-size: 2em; font-weight: bold; color: #FF5733; text-align: center; margin: 20px 0; }
        .nav { background-color: #333; overflow: hidden; }
        .nav a { float: left; display: block; color: white; text-align: center; padding: 14px 16px; text-decoration: none; }
        .nav a:hover { background-color: #ddd; color: black; }
        .mobile-nav-btn { display: none; background: #4CAF50; color: white; padding: 10px; cursor: pointer; }
        .content { margin-top: 20px; }
        .download-btn { background-color: #4CAF50; color: white; padding: 12px 24px; text-align: center; display: inline-block; margin: 20px 0; }
        .login-btn { background-color: #33A1FF; color: white; padding: 12px 24px; text-align: center; display: inline-block; margin: 20px 10px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { margin-top: 50px; text-align: center; padding: 20px; background-color: #f2f2f2; }
        @media screen and (max-width: 768px) {
            .nav a { float: none; display: none; }
            .nav a.mobile-nav-btn { display: block; }
            .nav.responsive { position: relative; }
            .nav.responsive a { float: none; display: block; text-align: left; }
        }