/* Overlay plein écran semi-transparent */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, visibility .2s ease;
  backdrop-filter: blur(1px);
  pointer-events: none;
}
#loading-overlay.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  cursor: progress;
}

#loading-overlay .loader {
  width: 96px;
  height: 96px;
  display: grid;
  place-items: center;
}

/* Anneau de chargement */
#loading-overlay .loader-ring {
  width: 64px;
  height: 64px;
  border: 6px solid rgba(255,255,255,.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: loader-spin 1s linear infinite;
  box-sizing: border-box;
}

@keyframes loader-spin { to { transform: rotate(360deg); } }