.t-tt-group {
  position: relative;
  display: inline-flex;
}
.t-tt {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 0;                 /* the JS writes the measured width */
  overflow: hidden;
  /* Individual transform properties: the travel (translate) and the
     appear (scale) run on their own clocks. */
  translate: var(--tt-x, 0px) 0;
  scale: var(--tt-scale);
  transform-origin: 50% 100%;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--tt-bg);
  color: var(--tt-fg);
  white-space: nowrap;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.06),
    0 2px 6px 0 rgba(0, 0, 0, 0.05),
    0 4px 42px 0 rgba(0, 0, 0, 0.06);
  opacity: 0;
  pointer-events: none;
  /* Default rule controls the LEAVE state: no delay, so hiding plays
     immediately. The move lanes are always live. */
  transition:
    opacity   var(--tt-out-dur) var(--tt-out-ease),
    scale     var(--tt-out-dur) var(--tt-out-ease),
    translate var(--tt-move-dur) var(--tt-move-ease),
    width     var(--tt-move-dur) var(--tt-move-ease);
}
/* The appear delay belongs ONLY to the show rule, so hiding snaps it
   back to 0. A retarget while showing carries no delay at all. */
.t-tt[data-show="true"] {
  opacity: 1;
  scale: 1;
  transition:
    opacity   var(--tt-in-dur) var(--tt-in-ease) var(--tt-delay),
    scale     var(--tt-in-dur) var(--tt-in-ease) var(--tt-delay),
    translate var(--tt-move-dur) var(--tt-move-ease),
    width     var(--tt-move-dur) var(--tt-move-ease);
}
.t-tt-text { white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  .t-tt { transition: none !important; }
}