html:not([lang="en"]) [data-en], html[lang="en"] [data-zh],
[data-zh][hidden], [data-en][hidden] { display: none !important; }
.language-switch {
  flex-shrink: 0;
  min-width: 48px;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--line, rgba(255,255,255,.15));
  border-radius: 999px;
  background: rgba(255,255,255,.05);
  color: inherit;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.language-switch:hover { background: rgba(255,255,255,.12); }
.language-switch:focus-visible { outline: 2px solid #8fbfff; outline-offset: 4px; }
.video-stage.has-error::before { content: attr(data-error); }