body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; background-color: #f9f9f9; margin: 0; padding: 0; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #8B0000; color: white; padding: 20px; text-align: center; }
        .logo { font-size: 2.5em; font-weight: bold; text-shadow: 2px 2px 4px #000; }
        nav { background-color: #555; overflow: hidden; }
        nav a { float: left; display: block; color: white; text-align: center; padding: 14px 16px; text-decoration: none; }
        .mobile-menu { display: none; background-color: #555; color: white; text-align: center; padding: 14px 16px; cursor: pointer; }
        .content { padding: 20px; }
        .download-btn, .login-btn { background-color: #4CAF50; color: white; padding: 10px 20px; margin: 10px 0; border: none; cursor: pointer; }
        footer { background-color: #333; color: white; text-align: center; padding: 20px; }
        img { max-width: 100%; height: auto; }
        @media screen and (max-width: 768px) {
            nav a { display: none; }
            .mobile-menu { display: block; }
            .nav-responsive { display: block; }
            .nav-responsive a { float: none; display: block; text-align: left; }
        }