body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;margin:0;padding:0;background-color:#f8f9fa}.btn-primary{background-color:#007bff;border-color:#007bff}.btn-primary:hover{background-color:#0056b3;border-color:#0056b3}.spinner{border:4px solid #f3f3f3;border-top:4px solid #3498db;border-radius:50%;width:40px;height:40px;animation:spin 2s linear infinite;margin:20px auto}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.drag-drop-area{border:2px dashed #ccc;border-radius:8px;padding:40px;text-align:center;transition:border-color .3s ease;cursor:pointer}.drag-drop-area:hover,.drag-drop-area.dragover{border-color:#007bff;background-color:#f0f7ff}.drag-drop-area.dragover{border-color:#28a745;background-color:#f0fff4}.table th{background-color:#f8f9fa;border-bottom:2px solid #dee2e6}.alert{border:none;border-radius:8px}.card{border:none;box-shadow:0 2px 4px #0000001a;border-radius:8px}.form-control:focus{border-color:#007bff;box-shadow:0 0 0 .2rem #007bff40}