body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background-color: #f5f5f5; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #2c3e50; color: white; padding: 15px 0; text-align: center; position: relative; }
        header h1 { margin: 0; font-size: 28px; }
        .logo-text { font-weight: bold; font-size: 32px; text-shadow: 2px 2px 4px #000; }
        nav { background-color: #34495e; overflow: hidden; }
        nav a { color: white; text-decoration: none; padding: 14px 16px; display: block; float: left; }
        nav a:hover { background-color: #ddd; color: black; }
        .mobile-menu-btn { display: none; background-color: #34495e; color: white; border: none; padding: 10px; cursor: pointer; }
        .content { background-color: white; padding: 20px; margin-top: 20px; border-radius: 5px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .download-btn, .login-btn { display: inline-block; background-color: #e74c3c; color: white; padding: 10px 20px; margin: 10px 0; border-radius: 5px; text-decoration: none; font-weight: bold; }
        footer { background-color: #2c3e50; color: white; text-align: center; padding: 20px 0; margin-top: 20px; }
        @media screen and (max-width: 768px) {
            nav a { float: none; display: none; text-align: center; }
            nav a.active { display: block; }
            .mobile-menu-btn { display: block; }
            .logo-text { font-size: 24px; }
        }