/* -----------------------------------------
   BUTTONS
----------------------------------------- */
.tts-reader-wrapper button {
  background-color: var(--tts-btn-color);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  margin-right: 6px;
}

.tts-reader-wrapper button:hover {
  opacity: 0.9;
}

/* -----------------------------------------
   VOLUME CONTAINER (fixed right)
----------------------------------------- */
#tts-volume-container {
  position: fixed;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  height: 160px;
  width: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

/* -----------------------------------------
   VERTICAL SLIDER
----------------------------------------- */
#tts-volume {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  width: 40px;
  height: 160px;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
}

/* -----------------------------------------
   TRACK (bar)
----------------------------------------- */
#tts-volume::-webkit-slider-runnable-track {
  width: 6px;
  height: 160px;
  background: var(--tts-bar-color);
  border-radius: 3px;
  margin-left: 17px;
}

#tts-volume::-moz-range-track {
  width: 6px;
  height: 160px;
  background: var(--tts-bar-color);
  border-radius: 3px;
}

/* -----------------------------------------
   THUMB (circle)
----------------------------------------- */
#tts-volume::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--tts-circle-size);
  height: var(--tts-circle-size);
  background: var(--tts-circle-color);
  border-radius: 50%;
  cursor: grab;
  margin-right: var(--tts-circle-offset) !important;
}

#tts-volume::-moz-range-thumb {
  width: var(--tts-circle-size);
  height: var(--tts-circle-size);
  background: var(--tts-circle-color);
  border-radius: 50%;
  cursor: grab;
  margin-right: var(--tts-circle-offset) !important;
}

/* -----------------------------------------
   SENTENCE HIGHLIGHT (optional)
----------------------------------------- */
.tts-highlight {
  background: yellow;
}