.portal-navigation-loading {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(0, 0, 0, .9);
  color: #ddd;
  font: 16px Inconsolata, monospace;
}
.portal-navigation-loading[hidden] { display: none; }
.portal-navigation-spinner {
  width: 22px;
  height: 22px;
  border: 2px solid #333;
  border-top-color: #ff9500;
  border-radius: 50%;
  animation: portal-navigation-spin .7s linear infinite;
}
@keyframes portal-navigation-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .portal-navigation-spinner { animation: none; }
}