.tts-tool {
  max-width: 960px;
  margin: 16px auto;
  font-family: Arial, Helvetica, sans-serif;
}

.tts-panel {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}

.tts-panel textarea {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  padding: 12px;
  border-radius: 6px;
  border: 1px solid #d1d5db;
  font-size: 14px;
}

.tts-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.control label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
  color: #374151;
}

.control select {
  width: 100%;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  padding: 10px 40px 10px 12px;
  border-radius: 8px;
  border: 1px solid #bfdbfe;
  background: linear-gradient(180deg,#ffffff,#f8fdff);
  box-shadow: 0 4px 14px rgba(3,102,214,0.06);
  background-image: linear-gradient(45deg, transparent 50%, #475569 50%), linear-gradient(135deg, #475569 50%, transparent 50%);
  background-repeat: no-repeat;
  background-position: right 12px center, right 7px center;
  background-size: 6px 6px, 6px 6px;
}

.control select:focus {
  outline: none;
  border-color: #60a5fa;
  box-shadow: 0 0 0 6px rgba(96,165,250,0.08);
}

.control input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 36px;
  background: transparent;
}

.control input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 8px;
  background: linear-gradient(90deg, #90cdf4, #0077b6);
}

.control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ffffff;
  border: 4px solid #0077b6;
  margin-top: -6px;
  box-shadow: 0 6px 18px rgba(3,102,214,0.14);
}

.control input[type="range"]::-moz-range-track {
  height: 8px;
  border-radius: 8px;
  background: linear-gradient(90deg, #90cdf4, #0077b6);
}

.control input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ffffff;
  border: 4px solid #0077b6;
  box-shadow: 0 6px 18px rgba(3,102,214,0.14);
}

.tts-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.btn {
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid #d1d5db;
  background: #f3f4f6;
  cursor: pointer;
}

.btn.primary {
  background: linear-gradient(135deg, #0077b6, #00a8e8);
  color: #fff;
  border: none;
}

.tts-warning {
  margin-top: 12px;
  color: #b91c1c;
  font-size: 14px;
}

.tts-tip {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 8px;
  background: linear-gradient(180deg, #f0f9ff, #e6f3ff);
  border-left: 4px solid #0077b6;
  box-shadow: 0 8px 20px rgba(3,102,214,0.06);
  color: #0f172a;
  font-size: 14px;
}

.tts-tip p {
  margin: 0;
  display: flex;
  gap: 8px;
  align-items: center;
}

.tts-tip strong {
  color: #034ea2;
}

@media (max-width: 600px) {
  .tts-actions {
    flex-direction: column;
  }
}