body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .logo { font-size: 28px; font-weight: bold; color: #0066cc; text-align: center; margin: 20px 0; }
        nav { background: #f8f8f8; padding: 10px; margin: 10px 0; }
        nav a { margin: 0 10px; text-decoration: none; color: #0066cc; }
        .mobile-nav-btn { display: none; background: #0066cc; color: white; padding: 5px 10px; border: none; cursor: pointer; }
        h1 { color: #0066cc; }
        h2 { color: #339966; }
        h3 { color: #ff6600; }
        .download-btn, .login-btn { display: inline-block; padding: 10px 20px; margin: 10px 0; background: #0066cc; color: white; text-decoration: none; border-radius: 5px; }
        .image-container { text-align: center; margin: 20px 0; }
        img { max-width: 100%; height: auto; }
        footer { margin-top: 30px; padding: 20px; background: #f8f8f8; text-align: center; }
        @media (max-width: 768px) {
            .mobile-nav-btn { display: block; }
            nav { display: none; }
            nav.active { display: block; }
        }