/* loader.css */
.loader-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(255,255,255,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}
.loader-overlay.hidden {
  display: none;
}
.loader-overlay::after {
  content: '';
  width: 40px;
  height: 40px;
  border: 4px solid #ccc;
  border-top-color: #0078be;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}