:root {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-accent: #2a2a2a;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent-color: #00ff88;
  --accent-color-hover: #00cc6e;
  --danger-color: #ff4444;
  --loop-color: rgba(0, 170, 255, 0.2);
  --playhead-color: #ff3b3b;
  --border-color: #333;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body.pro-theme {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.main-toolbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  padding: 0.5rem 1rem;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
  user-select: none;
}

.btn-primary {
  background: var(--accent-color);
  color: #000;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-color-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-accent);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: #3a3a3a;
}

.btn-toggle {
  background: var(--bg-accent);
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn-toggle.active {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.status-info {
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  color: var(--accent-color);
  display: flex;
  gap: 1.5rem;
}

.app-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  gap: 1rem;
  overflow-y: auto;
}

.navigation-zone {
  min-height: 40px;
}

.marker-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.section-btn {
  padding: 4px 10px;
  background: var(--bg-accent);
  color: var(--accent-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 10px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s ease;
}

.section-btn:hover {
  background: var(--accent-color);
  color: #000;
}

.timeline-viewport {
  position: relative;
  height: 140px;
  background: #181818;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow-x: auto;
  overflow-y: hidden;
  box-shadow: inset 0 2px 15px rgba(0, 0, 0, 0.5);
}

.timeline-surface {
  position: relative;
  height: 100%;
}

.bar {
  position: absolute;
  top: 0;
  height: 100%;
  border-left: 1px solid #333;
  padding: 4px;
  font-size: 10px;
  color: var(--text-secondary);
  pointer-events: none;
}

.playhead {
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--playhead-color);
  z-index: 100;
  box-shadow: 0 0 8px rgba(255, 59, 59, 0.5);
}

.beat-line {
  position: absolute;
  top: 0;
  height: 100%;
  width: 1px;
  background: rgba(255, 255, 255, 0.05);
}

.beat-strong {
  background: rgba(255, 255, 255, 0.12);
}

.loop-region {
  position: absolute;
  top: 0;
  height: 100%;
  background: var(--loop-color);
  pointer-events: none;
  display: none;
}

.loop-marker {
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  z-index: 200;
  display: none;
}

.loop-marker.start { background: #00aaff; box-shadow: 0 0 10px rgba(0, 170, 255, 0.5); }
.loop-marker.end { background: var(--danger-color); box-shadow: 0 0 10px rgba(255, 68, 68, 0.5); }

.sheet-music-viewer {
  background: white;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  height: 200px;
  position: relative;
}

.app-status-bar {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 0.35rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

#status-message {
  color: var(--accent-color);
}

#red-cursor {
  width: 2px !important; 
  background-color: var(--playhead-color) !important;
  content: url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7") !important;
  z-index: 100 !important;
  box-shadow: 0 0 5px rgba(255, 59, 59, 0.5);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #444;
}