.synth-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 16px;
  padding: 0 12px;
}

.synth-knobs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  width: min(100%, 1100px);
  margin: 0 auto;
}

.knob-group {
  background: linear-gradient(160deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.7));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  backdrop-filter: blur(6px);
}

.knob-group h3 {
  margin: 0 0 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.knob-row {
  display: flex;
  gap: 14px;
  align-items: stretch;
  justify-content: space-around;
}

.knob {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  min-width: 70px;
  gap: 4px;
}

.knob label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
}

.knob input[type='range'] {
  width: 100%;
  accent-color: var(--accent-2);
}

.knob-value {
  font-size: 11px;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  opacity: 0.85;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.preset-buttons button {
  background: rgba(30, 41, 59, 0.85);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    border-color 120ms ease,
    background 120ms ease,
    transform 80ms ease;
}

.preset-buttons button:hover {
  border-color: var(--accent);
  background: rgba(30, 41, 59, 1);
}

.preset-buttons button:active {
  transform: translateY(1px);
}

.preset-buttons button.is-active {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(129, 140, 248, 0.25), rgba(244, 114, 182, 0.25));
}

@media (max-width: 640px) {
  .synth-knobs {
    grid-template-columns: 1fr 1fr;
  }
  .knob-group.preset-group {
    grid-column: 1 / -1;
  }
}