body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #0066cc; margin-top: 30px; }
        h1 { font-size: 2.5em; }
        h2 { font-size: 1.8em; }
        h3 { font-size: 1.5em; }
        .logo { font-size: 2em; font-weight: bold; color: #ff9900; text-decoration: none; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; }
            .nav-btn { background: #0066cc; color: white; padding: 10px; border: none; cursor: pointer; }
            .nav-content { display: none; }
        }
        .download-btn { background: #4CAF50; color: white; padding: 12px 20px; text-decoration: none; display: inline-block; margin: 10px 0; }
        .login-btn { background: #2196F3; color: white; padding: 12px 20px; text-decoration: none; display: inline-block; margin: 10px 0; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tag { background: #f0f0f0; padding: 5px 10px; margin: 5px; display: inline-block; }
        footer { margin-top: 50px; padding-top: 20px; border-top: 1px solid #ddd; }