body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #0066cc; text-align: center; }
        h2 { color: #009933; border-bottom: 2px solid #f0f0f0; padding-bottom: 5px; }
        h3 { color: #ff6600; }
        .logo { font-size: 28px; font-weight: bold; color: #0066cc; text-shadow: 1px 1px 2px #ccc; }
        .nav { background: #f9f9f9; padding: 10px; display: flex; justify-content: space-around; flex-wrap: wrap; }
        .nav a { color: #0066cc; text-decoration: none; padding: 5px 10px; }
        .mobile-nav-toggle { display: none; background: #0066cc; color: white; padding: 10px; border: none; cursor: pointer; }
        .content { margin-top: 20px; }
        .download-btn, .login-btn { display: inline-block; background: #009933; color: white; padding: 10px 20px; margin: 10px 0; text-decoration: none; border-radius: 5px; }
        .download-btn:hover, .login-btn:hover { background: #006622; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { margin-top: 40px; padding: 20px; background: #f0f0f0; text-align: center; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; }
            .mobile-nav-toggle { display: block; }
            .nav.active { display: block; }
            .nav { display: none; }
        }