/* ==========================================================================
   Omnizart Studio — Piano Roll Viewport, Canvas & DAW Footer
   ========================================================================== */

.roll-viewport {
  position: relative;
  flex: 1;
  min-height: 480px;
  max-height: 640px;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-base);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

#pianoRollCanvas {
  display: block;
  width: 100%;
  cursor: crosshair;
}

/* Empty State */
.empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
  user-select: none;
}

.empty-icon {
  font-size: 38px;
  color: var(--text-dim);
  opacity: 0.7;
}

.empty-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

.empty-text {
  font-size: 12px;
  color: var(--text-dim);
  max-width: 380px;
  line-height: 1.5;
}

/* DAW Toolbar & Transport */
.daw-toolbar {
  height: 48px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  gap: 12px;
  user-select: none;
}

.transport-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.transport-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border-radius: var(--radius-xs);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.transport-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.transport-btn.primary {
  background: var(--accent-amber);
  color: #0b0c10;
  border-color: var(--accent-amber);
  font-weight: 600;
}

.transport-btn.primary:hover {
  filter: brightness(1.1);
}

.transport-timecode {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-amber);
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  padding: 5px 12px;
  border-radius: var(--radius-xs);
  letter-spacing: 0.05em;
  min-width: 140px;
  text-align: center;
}

.zoom-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.zoom-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-xs);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 11px;
}

.zoom-btn:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

/* DAW Footer Statistics */
.daw-footer {
  min-height: 36px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 11.5px;
  color: var(--text-dim);
}

.footer-stats {
  display: flex;
  align-items: center;
  gap: 20px;
}

.f-stat {
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 6px;
}

.f-stat strong {
  color: var(--text-muted);
  font-weight: 500;
}

.f-stat span {
  color: var(--text-main);
}

.engine-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  letter-spacing: 0.05em;
}

@media (max-width: 768px) {
  .roll-viewport {
    min-height: 360px;
    max-height: 480px;
  }
  .daw-toolbar {
    height: auto;
    padding: 8px 12px;
    flex-wrap: wrap;
  }
  .daw-footer {
    height: auto;
    padding: 8px 12px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .footer-stats {
    gap: 12px;
  }
}

/* ==========================================================================
   Track Mixer Strip & Dual Viewport Toggle
   ========================================================================== */

.view-toggle-group {
  display: inline-flex;
  align-items: center;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 2px;
  gap: 2px;
}

.view-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.view-toggle-btn:hover {
  color: var(--text-main);
  background: var(--bg-hover);
}

.view-toggle-btn.active {
  background: var(--bg-elevated);
  color: var(--accent-amber);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-strong);
}

/* Track Mixer Strip */
.track-mixer-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
  user-select: none;
}

.mixer-track-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  min-width: 220px;
  flex: 1;
  transition: all 0.15s ease;
}

.mixer-track-strip.muted {
  opacity: 0.55;
  filter: grayscale(0.5);
  border-color: rgba(239, 68, 68, 0.3);
}

.mixer-track-strip.soloed {
  border-color: var(--accent-amber);
  box-shadow: 0 0 12px var(--accent-amber-glow);
}

.mixer-track-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.track-color-indicator {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  flex-shrink: 0;
}

.track-color-indicator.keys {
  background: #f59e0b;
  box-shadow: 0 0 6px rgba(245, 158, 11, 0.4);
}

.track-color-indicator.drums {
  background: #f43f5e;
  box-shadow: 0 0 6px rgba(244, 63, 94, 0.4);
}

.track-color-indicator.vocals {
  background: #06b6d4;
  box-shadow: 0 0 6px rgba(6, 182, 212, 0.4);
}

html[data-theme="light"] .track-color-indicator.keys {
  background: #d97706;
}
html[data-theme="light"] .track-color-indicator.drums {
  background: #e11d48;
}
html[data-theme="light"] .track-color-indicator.vocals {
  background: #0891b2;
}

.track-glyph {
  font-size: 14px;
}

.track-name {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-main);
}

.track-badge {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-dim);
  background: var(--bg-base);
  padding: 1px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
}

.mixer-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-mixer-toggle {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
  background: var(--bg-base);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-mixer-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

/* Mute button active (Red/Muted state) */
.btn-mixer-toggle.btn-mute.active {
  background: #ef4444;
  border-color: #dc2626;
  color: #ffffff;
  box-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
}

/* Solo button active (Amber/Yellow state) */
.btn-mixer-toggle.btn-solo.active {
  background: #f59e0b;
  border-color: #d97706;
  color: #0b0c10;
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
}

/* Stem ZIP download button */
.btn-stems-zip {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(245, 158, 11, 0.2)) !important;
  border: 1px solid var(--accent-amber) !important;
  color: var(--text-main) !important;
}

.btn-stems-zip:hover {
  filter: brightness(1.15);
}