.audio-enhancement-panel {
  margin: 0 0 var(--space-4);
  padding: var(--space-4);
}

.audio-enhancement-heading-row,
.audio-status-line,
.audio-compare-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.audio-enhancement-heading-row {
  margin-bottom: var(--space-4);
}

.audio-enhancement-panel > summary {
  cursor: pointer;
  list-style: none;
}

.audio-enhancement-panel > summary::-webkit-details-marker {
  display: none;
}

.audio-enhancement-panel[open] > summary {
  margin-bottom: 1rem;
}

.audio-enhancement-heading-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.audio-enhancement-heading-title {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.audio-enhancement-heading-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.audio-enhancement-disclosure {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: transform var(--transition-fast);
}

.audio-enhancement-panel[open] .audio-enhancement-disclosure {
  transform: rotate(90deg);
}

.audio-enhancement-body {
  display: flex;
  flex-direction: column;
}

.audio-enhancement-heading-row .card-title {
  margin-bottom: var(--space-1);
}

.audio-enhancement-help {
  margin: var(--space-1) 0 0;
  color: var(--text-secondary);
  font-size: 0.82rem;
  line-height: 1.45;
}

.audio-enhancement-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-element);
}

.audio-enhancement-controls fieldset {
  min-width: 0;
  padding: var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.audio-enhancement-controls legend {
  padding: 0 var(--space-1);
  color: var(--text-primary);
  font-weight: 650;
}

.audio-enhancement-controls label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  color: var(--text-secondary);
  font-size: 0.83rem;
}

.audio-control-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin: var(--space-2) 0;
}

/* Progressive Disclosure & Interactive Parameter Tuning */
.audio-preset-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.audio-preset-select-label {
  flex: 1 1 14rem;
  margin: 0;
}

.audio-interactive-tune-btn {
  flex: 0 0 auto;
  height: 34px;
}

.audio-interactive-tune-btn.is-active {
  border-color: var(--accent-primary, #38bdf8);
  background: var(--bg-elevated, var(--bg-surface-elevated));
  font-weight: 600;
}

.audio-preset-summary-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.audio-recipe-pill {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-elevated, var(--bg-surface-elevated, rgba(255, 255, 255, 0.06)));
  border: 1px solid var(--border-subtle, var(--border-color));
  color: var(--text-secondary);
}

.audio-interactive-tuning-panel {
  margin-top: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle, var(--border-color));
  background: var(--bg-surface, var(--bg-surface-elevated, var(--bg-card)));
  display: grid;
  gap: var(--space-3);
  box-sizing: border-box;
}

.audio-interactive-tuning-panel[hidden] {
  display: none !important;
}

.audio-live-tuning-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated, var(--bg-input, var(--bg-card)));
  border: 1px solid var(--border-subtle, var(--border-color));
  box-sizing: border-box;
}

.audio-live-autoplay-label {
  display: inline-flex !important;
  flex-direction: row !important;
  align-items: center;
  gap: var(--space-2) !important;
  font-size: 0.82rem !important;
  color: var(--text-primary) !important;
  cursor: pointer;
  user-select: none;
  margin: 0 !important;
}

.audio-live-autoplay-label input {
  width: 1rem;
  height: 1rem;
  margin: 0;
}

.audio-live-status-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.audio-live-status-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-hover, rgba(255, 255, 255, 0.06));
  border: 1px solid var(--border-subtle, var(--border-color));
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.audio-live-status-badge[data-live-state="streaming"],
.audio-live-status-badge[data-live-state="debouncing"] {
  color: var(--warning, #f59e0b);
  border-color: rgba(245, 158, 11, 0.4);
}

.audio-live-status-badge[data-live-state="playing"] {
  color: var(--accent-primary, #38bdf8);
  border-color: rgba(56, 189, 248, 0.5);
}

.audio-live-status-badge[data-live-state="ready"] {
  color: var(--success, #10b981);
  border-color: rgba(16, 185, 129, 0.4);
}

.audio-live-status-badge[data-live-state="error"] {
  color: var(--danger, #ef4444);
  border-color: rgba(239, 68, 68, 0.4);
}

#enhancement-live-audio {
  width: 100%;
  height: 32px;
  margin-top: var(--space-1);
}

.audio-tuning-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.audio-tuning-groups .audio-enhancement-help {
  display: none;
}

.audio-position-controls,
.audio-enhancement-actions {
  display: flex;
  align-items: end;
  flex-wrap: wrap;
  gap: var(--gap-control);
  margin-top: var(--space-2);
}

.audio-normalize-label {
  display: flex !important;
  flex-direction: row !important;
  align-items: center;
  gap: var(--gap-control) !important;
  margin: var(--space-2) 0;
  color: var(--text-primary) !important;
}

.audio-normalize-label input {
  width: 1rem;
  height: 1rem;
}

.audio-enhancement-actions {
  margin: var(--space-4) 0 0;
}

.audio-enhancement-status {
  margin: var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-input);
}

.audio-status-line {
  margin-bottom: var(--space-1);
  color: var(--text-secondary);
  font-size: 0.82rem;
}

.audio-enhancement-status progress {
  display: block;
  width: 100%;
  height: 0.55rem;
  accent-color: var(--primary, #3b82f6);
}

.audio-enhancement-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.audio-compare-card {
  min-width: 0;
  padding: var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
}

.audio-compare-card.is-playing {
  border-color: var(--accent-color, #3b82f6);
  box-shadow: 0 0 0 1px var(--accent-color, #3b82f6);
}

.audio-compare-heading {
  align-items: baseline;
  margin-bottom: var(--space-2);
}

.audio-compare-heading h4 {
  margin: 0;
  color: var(--text-primary);
}

.audio-compare-heading span {
  color: var(--text-secondary);
  font-size: 0.78rem;
  text-align: right;
}

.audio-compare-card audio {
  display: block;
  width: 100%;
  margin-bottom: var(--space-2);
}

.audio-ab-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.audio-ab-controls label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--text-secondary);
  font-size: 0.83rem;
}

.audio-enhancement-stale {
  margin: var(--space-2) 0;
  color: var(--danger, #ef4444);
  font-size: 0.85rem;
}

.audio-subpanel {
  margin-top: var(--space-4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated, var(--bg-card));
  box-sizing: border-box;
  overflow: hidden;
}

.audio-subpanel > summary {
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface-hover, rgba(255, 255, 255, 0.03));
  border-bottom: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.audio-subpanel > summary::-webkit-details-marker {
  display: none;
}

.audio-subpanel[open] > summary {
  border-bottom-color: var(--border-color);
}

.audio-operations-log-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  box-sizing: border-box;
}

.audio-operations-log-heading-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.audio-operations-log-heading-title {
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--text-primary);
}

.audio-operations-log-help {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.audio-operations-log-heading-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.audio-operations-log-disclosure {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: transform var(--transition-fast);
}

.audio-operations-log[open] .audio-operations-log-disclosure {
  transform: rotate(90deg);
}

.audio-operations-log-body {
  padding: var(--space-3) var(--space-4);
  box-sizing: border-box;
}

.audio-operations-log-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.audio-operations-log-item {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  box-sizing: border-box;
}

.audio-op-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  box-sizing: border-box;
}

.audio-op-kind {
  font-size: 0.85rem;
  color: var(--text-primary);
  text-transform: capitalize;
}

.audio-op-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-left: auto;
}

.audio-op-details {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 0.8rem;
  color: var(--text-secondary);
  box-sizing: border-box;
}

.audio-op-interval,
.audio-op-summary {
  font-size: 0.8rem;
}

/* Recommended A/B Intervals (Highest Perceived Difference) */
.audio-recommended-ab-bar {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated, var(--bg-card));
  box-sizing: border-box;
}

.audio-recommended-ab-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.audio-recommended-ab-title-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.audio-recommended-ab-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--text-primary);
}

.audio-recommended-ab-status {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-hover, rgba(255, 255, 255, 0.06));
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.audio-recommended-ab-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.audio-scan-mode-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0;
}

.audio-recommended-ab-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.audio-recommended-ab-placeholder {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-style: italic;
  margin: var(--space-2) 0;
}

.audio-recommended-ab-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
  box-sizing: border-box;
}

.audio-recommended-ab-card:hover {
  border-color: var(--primary, #3b82f6);
  background: var(--bg-surface-hover, rgba(59, 130, 246, 0.05));
}

.audio-recommended-ab-card.is-active {
  border-color: var(--accent-color, #38bdf8);
  box-shadow: 0 0 0 1px var(--accent-color, #38bdf8);
  background: var(--surface-muted, rgba(56, 189, 248, 0.12));
}

.audio-recommended-rank {
  font-weight: 700;
  font-size: 0.75rem;
  background: var(--primary, #3b82f6);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 0.1rem 0.4rem;
  align-self: flex-start;
}

.audio-recommended-time {
  font-family: var(--font-mono, monospace);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.badge-accent {
  background: rgba(245, 158, 11, 0.2);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.4);
  font-weight: 600;
  font-size: 0.75rem;
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  align-self: flex-start;
}

.audio-recommended-summary {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: capitalize;
}

.audio-recommended-ab-card button[data-testid="ab-select-region-btn"] {
  margin-top: auto;
  width: 100%;
}

/* Changed-Region Navigation Bar (Non-Locking Navigation) */
.audio-difference-region-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--surface-muted, rgba(56, 189, 248, 0.08));
  margin: var(--space-2) 0;
  box-sizing: border-box;
}

.audio-difference-region-position {
  font-size: 0.85rem;
  font-weight: 650;
  color: var(--text-primary);
}

.audio-difference-region-nav-buttons {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

@media (max-width: 720px) {
  .audio-enhancement-panel {
    padding: var(--space-3);
  }

  .audio-enhancement-controls,
  .audio-enhancement-compare {
    grid-template-columns: minmax(0, 1fr);
  }

  .audio-enhancement-heading-row {
    align-items: flex-start;
  }

  .audio-enhancement-actions > button {
    flex: 1 1 100%;
    /* rem resolves against the 15px root: 44px is the touch-target floor. */
    min-height: 44px;
  }

  .audio-position-controls > button {
    min-height: 44px;
  }
}