.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 20px;
  background: #fff;
}
.loading-screen[hidden], .loading-error[hidden] { display: none; }
.loading-spinner {
  width: 80px;
  height: 80px;
  border: 5px solid #ebebeb;
  border-right-color: #171717;
  border-bottom-color: #171717;
  border-radius: 50%;
  animation: loading-spin 900ms linear infinite;
}
.loading-screen p { margin: 0; text-align: center; }
.loading-screen button { padding: 12px 20px; border: 1px solid #ddd; border-radius: 6px; }
.loading-screen:has(.loading-error:not([hidden])) .loading-spinner { display: none; }
@keyframes loading-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .loading-spinner { animation: none; transform: rotate(30deg); }
}