/* 屏幕大字幕 */
.tt-preview {
  margin: 12px 0; padding: 24px 16px; min-height: 90px;
  display: flex; align-items: center; overflow: hidden; white-space: nowrap;
  background: var(--panel-2, #f7f9fc); border: 1px solid var(--line, #e6e8ef);
  border-radius: 12px; font-weight: 800;
}
.tt-overlay { animation: none; }
@keyframes tt-left {
  from { transform: translateX(0); }
  to { transform: translateX(-100%); }
}
@keyframes tt-right {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}
@keyframes tt-up {
  from { transform: translateY(100%); }
  to { transform: translateY(-100%); }
}