.stego-tabs { display: flex; gap: 10px; margin-bottom: 20px; border-bottom: 2px solid var(--border-color); padding-bottom: 10px; }
            .stego-tab-btn { background: #e2e8f0; border: none; padding: 10px 20px; border-radius: 6px; font-weight: 600; cursor: pointer; color: var(--text-main); font-size: 0.9rem; }
            .stego-tab-btn.active { background: var(--primary-color); color: white; }
            
            .stego-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin-bottom: 20px; }
            .stego-panel { border: 2px dashed var(--border-color); border-radius: 8px; padding: 25px; background: #f8fafc; text-align: left; }
            
            .form-group { margin-bottom: 15px; }
            .form-group label { display: block; font-weight: 600; font-size: 0.9rem; color: var(--text-main); margin-bottom: 5px; }
            .form-group input[type="file"] { width: 100%; padding: 10px; border-radius: 6px; border: 1px solid var(--border-color); font-size: 0.9rem; background: #fff; cursor: pointer; }
            
            .action-section { margin-top: 20px; text-align: center; display: none; }
            .success-msg { color: #2ecc71; font-weight: 600; font-size: 0.9rem; margin-top: 10px; }