/* MasterForge Pro Master — Reference track strip (v4.15.6)
 *
 * Sits between the waveform toolbar and the canvas. Two states (empty drop
 * zone / loaded info-and-controls) plus a disabled state for multi-track.
 * Sage-green accent to distinguish from gold (master) / cyan (history) /
 * violet (surgical).
 */

:root {
  --pm-ref-accent:       #6fbf9a;
  --pm-ref-accent-soft:  rgba(111, 191, 154, 0.16);
  --pm-ref-accent-line:  rgba(111, 191, 154, 0.30);
  --pm-ref-accent-glow:  rgba(111, 191, 154, 0.25);
}

/* ── Strip container ──────────────────────────────────── */
.pm-reference-strip {
  border: 1px solid var(--pm-border-panel);
  border-top: none;                /* reads as continuous with the toolbar */
  background: linear-gradient(180deg,
    rgba(111, 191, 154, 0.04) 0%,
    rgba(15, 18, 25, 0.92) 100%);
  padding: 8px 12px;
  font-size: 0.84rem;
}

.pm-reference-strip[data-state="dragover"] {
  border-color: var(--pm-ref-accent);
  background: rgba(111, 191, 154, 0.10);
  box-shadow: inset 0 0 0 1px var(--pm-ref-accent);
}

/* ── Empty state (drop zone) ──────────────────────────── */
.pm-ref-empty {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 38px;
}

.pm-ref-empty-icon {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--pm-ref-accent-line);
  border-radius: 50%;
  color: var(--pm-ref-accent);
  font-size: 1rem;
  font-weight: 600;
}

.pm-ref-empty-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.pm-ref-empty-title {
  font-size: 0.84rem;
  color: var(--pm-text);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.pm-ref-empty-sub {
  font-size: 0.72rem;
  color: var(--pm-text-dim);
  letter-spacing: 0.02em;
}

.pm-ref-empty-btn {
  padding: 5px 12px;
  background: transparent;
  border: 1px solid var(--pm-ref-accent-line);
  color: var(--pm-ref-accent);
  border-radius: 4px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.pm-ref-empty-btn:hover {
  background: var(--pm-ref-accent-soft);
  border-color: var(--pm-ref-accent);
}

/* ── Loaded state (info + controls) ───────────────────── */
.pm-ref-loaded {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 38px;
}

.pm-ref-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.pm-ref-info-name {
  font-size: 0.84rem;
  color: var(--pm-text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pm-ref-info-meta {
  font-size: 0.72rem;
  color: var(--pm-text-dim);
  display: flex;
  gap: 8px;
}

.pm-ref-info-meta .pm-font-mono {
  color: var(--pm-text-secondary);
}

.pm-ref-info-sep { color: rgba(255, 255, 255, 0.15); }

/* ── Master / Reference segmented control ─────────────── */
.pm-ref-monitor {
  display: inline-flex;
  border: 1px solid var(--pm-ref-accent-line);
  border-radius: 4px;
  overflow: hidden;
}

.pm-ref-mode-btn {
  padding: 5px 14px;
  background: transparent;
  border: none;
  color: var(--pm-text-dim);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s ease;
}

.pm-ref-mode-btn + .pm-ref-mode-btn {
  border-left: 1px solid var(--pm-ref-accent-line);
}

.pm-ref-mode-btn:hover { color: var(--pm-ref-accent); }

.pm-ref-mode-btn.active {
  background: var(--pm-ref-accent);
  color: #0e1715;
  font-weight: 600;
  box-shadow: 0 0 8px var(--pm-ref-accent-glow);
}

/* ── Trim slider ──────────────────────────────────────── */
.pm-ref-trim {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pm-ref-trim-label {
  font-size: 0.72rem;
  color: var(--pm-text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pm-ref-trim-slider {
  width: 110px;
  accent-color: var(--pm-ref-accent);
}

.pm-ref-trim-val {
  font-size: 0.78rem;
  color: var(--pm-text-secondary);
  width: 4rem;
  text-align: right;
}

/* ── Clear / remove ───────────────────────────────────── */
.pm-ref-clear {
  width: 22px;
  height: 22px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: transparent;
  color: var(--pm-text-dim);
  border-radius: 4px;
  font-size: 0.95rem;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}
.pm-ref-clear:hover {
  border-color: var(--pm-orange);
  color: var(--pm-orange);
}

/* ── Disabled (multi-track) ───────────────────────────── */
.pm-ref-disabled {
  font-size: 0.78rem;
  color: var(--pm-text-dim);
  font-style: italic;
  text-align: center;
  padding: 8px 4px;
}