body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; }
            .toggle-nav { background: #2c3e50; color: white; padding: 10px; text-align: center; cursor: pointer; }
        }
        h1 { color: #2c3e50; border-bottom: 3px solid #e74c3c; padding-bottom: 10px; }
        h2 { color: #e74c3c; margin-top: 30px; }
        h3 { color: #3498db; }
        .download-btn, .login-btn { background: #27ae60; color: white; padding: 12px 25px; text-decoration: none; border-radius: 5px; margin: 15px 0; display: inline-block; }
        .image-container { text-align: center; margin: 25px 0; }
        img { max-width: 100%; height: auto; }
        table { width: 100%; border-collapse: collapse; margin: 20px 0; }
        th, td { border: 1px solid #ddd; padding: 12px; text-align: left; }
        th { background-color: #f2f2f2; }
        .tag { background: #f1c40f; padding: 3px 8px; border-radius: 3px; margin: 5px; display: inline-block; }