.stereo-width {
  width: min(100%, 380px);
  flex: 0 1 380px;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  background: rgba(20, 20, 34, 0.5);
}
.stereo-width__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
}
.stereo-width__header h2 { margin: 0; font-size: 22px; font-weight: 600; }
.stereo-width__toggle,
.stereo-width__presets button {
  padding: 9px 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
}
.stereo-width__toggle.is-active,
.stereo-width__presets button.is-active {
  color: var(--cyan);
  border-color: rgba(34, 211, 238, 0.4);
}
.stereo-width__control { display: grid; gap: 12px; }
.stereo-width__labels { display: flex; justify-content: space-between; color: var(--text-dim); font-size: 12px; }
.stereo-width__control input { width: 100%; accent-color: var(--cyan); }
.stereo-width__value { text-align: center; font-size: 24px; font-variant-numeric: tabular-nums; }
.stereo-width__presets { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 24px; }
.stereo-width__toggle:hover,
.stereo-width__presets button:hover { background: rgba(255, 255, 255, 0.1); }
.stereo-width__note { margin: 20px 0 0; color: var(--text-dim); font-size: 13px; text-align: center; }
@media (max-width: 720px) {
  .stereo-width { width: 100%; flex-basis: auto; }
  .stereo-width { padding: 20px; }
  .stereo-width__header { margin-bottom: 24px; }
}