:root {
  --time-signature-numerator: 4;
  --max-number-of-bars: 32;
  --track-grid-bar-width: 40px;
  --region-piano-key-width: 60px;
  --region-piano-key-height: 20px;
  --region-grid-beat-width: 40px;
  --region-grid-bar-width: calc(var(--region-grid-beat-width) * var(--time-signature-numerator)); 
  --chat-box-width: 350px;
  --instrument-selection-width: 300px;
}

/* Reset default styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

#root {
  width: 100%;
  height: 100vh;
  margin: 0;
  padding: 0;
  text-align: left;
  display: flex;
  flex-direction: column;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #1e1e1e;
  color: #e0e0e0;
}

/* Main container */
.daw-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

/* Main Display Area */
.main-display-area {
  display: flex;
  flex-direction: row;
  flex: 1;
  overflow: hidden;
}

/* Toolbar */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #2d2d2d;
  height: 50px;
  padding: 0 10px;
  border-bottom: 1px solid #3a3a3a;
}

.toolbar-left, .toolbar-center, .toolbar-right {
  display: flex;
  align-items: center;
}

.toolbar-left {
  display: flex;
  align-items: center;
}

.logo-container {
  margin-right: 10px;
  display: flex;
  align-items: center;
}

.logo {
  height: 30px;
  width: auto;
}

.project-name {
  font-size: 14px;
  color: #e0e0e0;
  margin-right: 20px;
  display: flex;
  align-items: center;
  pointer-events: auto;
}

.toolbar button {
  background: transparent;
  border: none;
  color: #e0e0e0;
  margin: 0 5px;
  padding: 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  font-size: 14px;
  pointer-events: auto;
}

.toolbar button:hover {
  background-color: #3a3a3a;
}

.toolbar button:disabled {
  color: #666;
  cursor: not-allowed;
}

.record-btn {
  color: #ff4444;
}

.toolbar-separator {
  width: 1px;
  height: 20px;
  background-color: #555;
  margin: 0 10px;
}

.transport-control {
  display: flex;
  align-items: center;
  margin: 0 10px;
  pointer-events: auto;
}

.transport-item {
  margin: 0 5px;
  padding: 2px 2px;
  background-color: #3a3a3a;
  border-radius: 3px;
  font-size: 12px;
}

/* Fixed-width font for time display to prevent layout shifts */
.current-time {
  font-family: 'Courier New', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-weight: normal;
  letter-spacing: 0.5px;
  padding: 2px 4px;
}

/* Clickable BPM styling */
.current-bpm {
  font-family: 'Courier New', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-weight: normal;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  padding: 2px 4px;
  border-radius: 2px;
}

.current-bpm:hover {
  background-color: #4a4a4a;
  color: #fff;
}

/* Clickable time signature styling */
.current-time-signature {
  font-family: 'Courier New', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-weight: normal;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  padding: 2px 4px;
  border-radius: 2px;
}

.current-time-signature:hover {
  background-color: #4a4a4a;
  color: #fff;
}

.current-key-signature {
  font-family: 'Courier New', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-weight: normal;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  padding: 2px 4px;
  border-radius: 2px;
}

.current-key-signature:hover {
  background-color: #4a4a4a;
  color: #fff;
}

.export-dropdown .quant-dropdown {
  width: 250px;
  left: 0;
}

/* Main content */
.main-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: auto; /* Main scrollable container */
  position: relative;
}

.main-content-wrapper {
  display: flex;
  flex-direction: column;
  min-width: calc(200px + var(--max-number-of-bars) * var(--track-grid-bar-width)); /* info width + grid width */
  min-height: fit-content;
  position: relative;
}

.top-left-spacer {
  position: fixed;
  top: 50px;
  left: 0;
  width: 200px;
  height: 20px;
  background-color: #2d2d2d;
  border-bottom: 1px solid #3a3a3a;
  border-right: 1px solid #3a3a3a;
  z-index: 1002; /* Higher than other elements to ensure it's always visible */
}

/* Offset spacer when instrument selection panel is visible on the left */
.main-content.has-left-instrument .top-left-spacer {
  left: 300px;
}

.bar-numbers {
  position: sticky;
  top: 0;
  height: 20px;
  display: flex;
  border-bottom: 1px solid #3a3a3a;
  background-color: #2d2d2d;
  z-index: 20;
  margin-left: 200px; /* Offset for info-container */
  width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width)); /* Exact width for 32 bars */
  cursor: pointer; /* Show pointer cursor on hover to indicate interactivity */
}

.bar-numbers:hover {
  cursor: url("data:image/svg+xml,%3csvg width='16' height='16' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M4 6h8l-4 4-4-4z' fill='%23e0e0e0'/%3e%3c/svg%3e") 8 8, pointer;
}

.bar-number-cell {
  min-width: var(--track-grid-bar-width);
  width: var(--track-grid-bar-width);
  flex-shrink: 0;
  flex-grow: 0;
  height: 20px;
  text-align: center;
  font-size: 12px;
  border-right: 1px solid #3a3a3a;
  color: #999;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

.main-content-body {
  display: flex;
  min-height: fit-content;
}

.info-container {
  position: sticky;
  left: 0;
  width: 200px;
  z-index: 1002;
  background-color: #2d2d2d;
  align-self: flex-start;
}

/* Shift the bar numbers and info panel when instrument selection is present */
/* No need to shift bar numbers or info container; they live inside main content.
   Only shift the fixed spacer when the left panel is present. */

.track-top-spacer {
  height: 20px;
  border-bottom: 1px solid #3a3a3a;
  background-color: #2d2d2d;
  position: sticky;
  top: 0;
  z-index: 15;
}

.grid-container {
  margin-left: 0; /* No need for margin since we're using flex */
  min-width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width)); /* Ensure minimum width */
  min-height: fit-content;
  position: relative; /* Required for absolute positioned playhead */
}

.track-grid {
  display: block;
  height: 120px;
  min-width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width)); /* 32 bars * --track-grid-bar-width */
  background-size: var(--track-grid-bar-width) 120px;
  background-image: 
    /* Vertical lines for bars */
    linear-gradient(to right, 
      transparent calc(var(--track-grid-bar-width) - 1px), #3a3a3a calc(var(--track-grid-bar-width) - 1px), #3a3a3a var(--track-grid-bar-width)
    );
  position: relative;
  border-bottom: 1px solid #3a3a3a;
}

.track-grid.pencil-cursor {
  cursor: crosshair;
}

.track-control {
  padding: 5px;
  background-color: #2d2d2d;
  border-top: 1px solid #3a3a3a;
}

.track-control button {
  background: transparent;
  border: none;
  color: #999;
  cursor: pointer;
  padding: 5px;
  width: 100%;
  text-align: left;
  font-size: 12px;
}

.track-control button:hover {
  color: #e0e0e0;
}

.track {
  display: flex;
  height: 120px;
  position: relative;
  border-bottom: none;
}

.track-info {
  width: 200px;
  height: 120px;
  padding: 15px;
  background-color: #2d2d2d;
  display: flex;
  flex-direction: column;
  border-right: 1px solid #3a3a3a;
  border-bottom: 1px solid #3a3a3a;
  flex-shrink: 0;
  box-sizing: border-box;
  cursor: grab;
  position: relative;
}

.track-info:active {
  cursor: grabbing;
}

.track-info.selected {
  background-color: #363636;
}

/* Drag and drop styles */
.track-info.drag-over {
  border-top: 2px solid #7b68ee;
}

.track-grid.drag-over {
  border-top: 2px solid #7b68ee;
}

/* Dragging state */
.track-info.dragging {
  opacity: 0.5;
  background-color: #444;
}

.track-grid.dragging {
  opacity: 0.5;
  background-color: #333;
}

/* Remove drag indicator since hover cursor is sufficient */

.track-name {
  font-size: 12px;
  cursor: pointer;
  position: relative;
}

.track-name:hover {
  color: #7b68ee;
}

.track-name:hover::before {
  content: "✎";
  position: absolute;
  right: 0px;
  font-size: 16px;
  opacity: 1;
}

.track-controls {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

.track-name-and-volume {
  display: flex;
  flex-direction: row;
  flex: 1;
  align-items: flex-start;
  gap: 8px;
}

.instrument-image {
  flex-shrink: 0;
  margin-top: -10px;
  margin-left: -10px;
}

.instrument-image img {
  display: block;
  border-radius: 4px;
}

.track-name-and-controls {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.volume-slider {
  margin-bottom: 15px;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
}

.volume-slider input[type="range"] {
  flex: 1;
  min-width: 0;
  height: 6px;
}

.volume-slider .reset-volume {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  border-radius: 8px;
  background: #3a3a3a;
  color: #e0e0e0;
  /* border: 1px solid #444; */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 10px;
}

.volume-slider .reset-volume:hover {
  background: #4a4a4a;
}

.pan-controls {
  display: flex;
}

.pan-controls button {
  background: #3a3a3a;
  border: none;
  color: #e0e0e0;
  margin-right: 5px;
  width: 24px;
  height: 24px;
  font-size: 12px;
  border-radius: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pan-controls button.solo.active {
  background: #c8a400; /* yellow */
  color: #101010;
}

.pan-controls button.mute.active {
  background: #d32f2f; /* red */
  color: #ffffff;
}

/* Status bar */
.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #2d2d2d;
  padding: 5px 10px;
  font-size: 12px;
  color: #999;
  border-top: 1px solid #3a3a3a;
  height: 30px;
}

.status-right span {
  margin-left: 15px;
}

/* For the piano roll (to be implemented later) */
.piano-roll {
  background-color: #7b68ee;
  height: 100%;
}

/* Piano Roll Panel */
.piano-roll-panel {
  position: fixed;
  background-color: #2d2d2d;
  border: 1px solid #3a3a3a;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Piano notes */
.piano-note {
  position: absolute;
  background-color: #ff5555; /* Red color */
  border: 1px solid #999;
  border-radius: 2px;
  z-index: 10;
  cursor: pointer;
  user-select: none;
  box-sizing: border-box;
}

.piano-note:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 5px rgba(255, 85, 85, 0.5);
}

.piano-note.dragging {
  opacity: 0.8;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  z-index: 100;
  cursor: grabbing;
}

.piano-note.resizing {
  opacity: 0.8;
  box-shadow: 0 0 10px rgba(255, 85, 85, 0.7);
  z-index: 100;
}

.piano-note.selected {
  border: 2px solid white;
  z-index: 50;
}

.piano-roll-header {
  height: 30px;
  background-color: #1e1e1e;
  border-bottom: 1px solid #3a3a3a;
  display: flex;
  align-items: center;
  padding: 0 10px;
  cursor: move;
  user-select: none;
}

/* Piano roll toolbar */
.piano-roll-toolbar {
  height: 30px;
  background-color: #252525;
  border-bottom: 1px solid #3a3a3a;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  user-select: none;
  position: relative;
}

/* Override pointer-events for piano roll toolbar sections */
.piano-roll-toolbar .toolbar-left,
.piano-roll-toolbar .toolbar-right {
  pointer-events: auto;
}

.piano-roll-toolbar .quant-button {
  font-size: 10px;
}

/* Generic button blink effect */
.quant-button.button-blink {
  animation: buttonBlink 0.2s ease-in-out;
}

@keyframes buttonBlink {
  0% { background-color: #333; }
  50% { background-color: #555; }
  100% { background-color: #333; }
}

.toolbar-left, .toolbar-right {
  display: flex;
  align-items: center;
  z-index: 1;
  pointer-events: none;
}

.toolbar-left {
  width: 20%;
  justify-content: flex-start;
}

.toolbar-right {
  width: 33%;
  justify-content: flex-end;
  z-index: 1500;
}

.toolbar-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1005;
  margin-left: -50px;
}

.tool-button {
  width: 30px;
  height: 30px;
  background-color: transparent;
  border: none;
  border-radius: 3px;
  color: #999;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin: 0 2px;
}

.tool-button:hover {
  background-color: #3a3a3a;
  color: #e0e0e0;
}

.tool-button.active {
  background-color: #4a4a4a;
  color: #e0e0e0;
}

.chatbox-export-dropdown .quant-dropdown {
  width: 250px;
  left: -200px;
}

.key-signature-dropdown .quant-dropdown {
  width: 100px;
  left: 0;
}

.quant-button {
  background-color: #333;
  border: 1px solid #444;
  border-radius: 3px;
  color: #e0e0e0;
  font-size: 12px;
  padding: 3px 8px;
  margin-left: 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
}

.quant-button:hover {
  background-color: #444;
}

.quant-dropdown-container {
  position: relative;
  display: inline-block;
  z-index: 1500;
}

.quant-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: #2d2d2d;
  border: 1px solid #444;
  border-radius: 3px;
  width: 100px;
  z-index: 1500;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  margin-top: 2px;
  max-height: 200px;
  overflow-y: auto;
}

.quant-option {
  padding: 6px 10px;
  font-size: 12px;
  color: #e0e0e0;
  cursor: pointer;
  transition: background-color 0.2s;
}

.quant-option:hover {
  background-color: #444;
}

.quant-option.active {
  background-color: #4a6b8a;
}

.piano-roll-title {
  flex: 1;
  text-align: center;
  font-size: 14px;
  color: #e0e0e0;
  text-transform: uppercase;
  cursor: pointer;
  padding: 5px;
  border-radius: 3px;
}

.close-button {
  background: transparent;
  border: none;
  color: #e0e0e0;
  cursor: pointer;
  font-size: 14px;
  padding: 5px;
}

.close-button:hover {
  color: #ff4444;
}

.piano-roll-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: auto;
}

.piano-grid-header {
  display: grid;
  grid-template-columns: repeat(var(--max-number-of-bars), var(--region-grid-bar-width));
  width: calc(var(--max-number-of-bars) * var(--region-grid-bar-width) + var(--region-piano-key-width) - 1px);
  min-width: 100%;
  height: 20px;
  border-bottom: 1px solid #3a3a3a;
  background-color: #1e1e1e;
  padding-left: calc(var(--region-piano-key-width) - 1px);
  box-sizing: border-box;
  position: sticky;
  top: 0;
  z-index: 20;
  cursor: pointer; /* Show pointer cursor on hover to indicate interactivity */
}

.piano-grid-header:hover {
  cursor: url("data:image/svg+xml,%3csvg width='16' height='16' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M4 6h8l-4 4-4-4z' fill='%23e0e0e0'/%3e%3c/svg%3e") 8 8, pointer;
}

.piano-bar-number {
  border-left: 1px solid #3a3a3a;
  padding-left: 10px;
  font-size: 10px;
}

.piano-roll-body {
  display: flex;
  min-height: calc(8 * 12 * var(--region-piano-key-height)); /* 8 octaves * 12 notes * piano key height */
  width: calc(var(--max-number-of-bars) * var(--region-grid-bar-width) + var(--region-piano-key-width)); /* 32 bars * 160px width + piano keys width */
}

.piano-keys-container {
  width: var(--region-piano-key-width);
  flex-shrink: 0;
  overflow: hidden;
  border-right: 1px solid #3a3a3a;
  background-color: #252525;
  position: sticky;
  left: 0;
  z-index: 10;
}

.piano-grid-container {
  flex: 1;
  min-width: calc(var(--max-number-of-bars) * var(--region-grid-bar-width));
  min-height: calc(8 * 12 * var(--region-piano-key-height));
  z-index: 5;
}

.piano-octave {
  display: flex;
  flex-direction: column;
}

.piano-key {
  width: var(--region-piano-key-width);
  height: var(--region-piano-key-height);
  box-sizing: border-box;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #3a3a3a;
}

.piano-key.natural {
  background-color: #e0e0e0;
  color: #222;
}

.piano-key.sharp {
  background-color: #222;
  color: #e0e0e0;
}

.key-label {
  font-size: 10px;
  padding-left: 5px;
}

.piano-grid {
  width: 100%;
  height: 100%;
  position: relative;
  background-size: var(--region-grid-beat-width) var(--region-piano-key-height), var(--region-grid-bar-width) var(--region-piano-key-height);
  background-image: 
    /* Vertical lines for beats */
    linear-gradient(to right, 
      transparent calc(var(--region-grid-beat-width) - 1px), #444 calc(var(--region-grid-beat-width) - 1px), #444 var(--region-grid-beat-width), 
      transparent calc(var(--region-grid-beat-width)), transparent calc(var(--region-grid-beat-width) * 2 - 1px), #444 calc(var(--region-grid-beat-width) * 2 - 1px), #444 calc(var(--region-grid-beat-width) * 2),
      transparent calc(var(--region-grid-beat-width) * 2), transparent calc(var(--region-grid-beat-width) * 3 - 1px), #444 calc(var(--region-grid-beat-width) * 3 - 1px), #444 calc(var(--region-grid-beat-width) * 3),
      transparent calc(var(--region-grid-beat-width) * 3), transparent calc(var(--region-grid-beat-width) * 4 - 1px), #3a3a3a calc(var(--region-grid-beat-width) * 4 - 1px), #3a3a3a calc(var(--region-grid-beat-width) * 4)
    ),
    /* Horizontal lines for notes */
    linear-gradient(to bottom,
      transparent calc(var(--region-piano-key-height) - 1px), #3a3a3a calc(var(--region-piano-key-height) - 1px), #3a3a3a var(--region-piano-key-height)
    );
}

.piano-grid.pencil-cursor {
  cursor: crosshair;
}

/* Piano Grid Cursor Highlights */
.piano-grid-pitch-highlight {
  position: absolute;
  left: 0;
  right: 0;
  background-color: rgba(123, 104, 238, 0.15);
  border-top: 1px solid rgba(123, 104, 238, 0.3);
  border-bottom: 1px solid rgba(123, 104, 238, 0.3);
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.1s ease;
}

.piano-grid-beat-highlight {
  position: absolute;
  top: 0;
  bottom: 0;
  background-color: rgba(123, 104, 238, 0.1);
  border-left: 1px solid rgba(123, 104, 238, 0.25);
  border-right: 1px solid rgba(123, 104, 238, 0.25);
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.1s ease;
}

.resize-handle {
  position: absolute;
  right: 5px;
  bottom: 5px;
  width: 20px;
  height: 20px;
  cursor: nwse-resize;
  color: #999;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

/* Track Region Styles */
.track-region {
  position: absolute;
  background-color: #4a6b8a;
  border: 2px solid #5a7b9a;
  border-radius: 3px;
  height: calc(100%);
  margin: 0px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  user-select: none;
  transition: box-shadow 0.1s ease;
  will-change: transform;
}

.track-region:hover {
  box-shadow: 0 0 0 1px #7a9bba;
}

.track-region.selected {
  /* box-shadow: 0 0 0 2px #ffffff, 0 0 8px rgba(255, 255, 255, 0.3); */ /* let's only apply a border */
  border-color: #ffffff;
}

.track-region.dragging {
  opacity: 0.8;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  z-index: 100;
  pointer-events: none;
  transform-origin: center center;
  animation: pulse 1.5s infinite;
  cursor: grabbing;
  transition: none; /* Remove transition during drag for immediate response */
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(122, 155, 186, 0.7);
  }
  70% {
    box-shadow: 0 0 0 5px rgba(122, 155, 186, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(122, 155, 186, 0);
  }
}

.region-header {
  background-color: #5a7b9a;
  color: #fff;
  padding: 2px 6px;
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: move;
  height: 18px;
  user-select: none;
}

.track-region:hover .region-header {
  background-color: #6a8baa;
}

.region-content {
  height: calc(100% - 18px);
  background-color: #87CEFA; /* Light blue */
  width: 100%;
  position: relative; /* Allow overlayed controls */
}

/* Region pencil trigger inside content */
.region-pencil-btn {
  position: absolute;
  top: 4px;
  left: 4px;
  background: rgba(0, 0, 0, 0.25);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  padding: 2px;
  margin: 0;
  cursor: pointer;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.region-pencil-btn:hover {
  background: rgba(0, 0, 0, 0.35);
}

/* Instrument dropdown specific styles */
.instrument-dropdown .quant-dropdown {
  min-width: 80px;
  width: auto;
  right: auto;
  left: 0;
}

/* Settings dropdown specific styles */
.settings-dropdown .quant-dropdown {
  min-width: 100px;
  width: auto;
  right: auto;
  left: 0;
}

/* Update structure in JSX to match this pattern:
<div className="main-content">
  <div className="main-content-wrapper">
    <div className="bar-numbers">...</div>
    <div className="main-content-body">
      <div className="info-container">...</div>
      <div className="grid-container">...</div>
    </div>
  </div>
</div>
*/

/* ChatBox */
.chatbox {
  display: flex;
  flex-direction: column;
  width: var(--chat-box-width);
  background-color: #2d2d2d;
  border-left: 1px solid #3a3a3a;
  flex-shrink: 0;
}

.chatbox.is-hidden {
  display: none;
}

/* Instrument Selection Panel */
.instrument-selection {
  display: flex;
  flex-direction: column;
  width: var(--instrument-selection-width);
  background-color: #2d2d2d;
  border-right: 1px solid #3a3a3a;
  flex-shrink: 0;
  position: relative;
}

.instrument-selection-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  padding: 0 12px;
  background-color: transparent;
  border: none;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
}

.instrument-selection-header h3 {
  color: #e0e0e0;
  font-size: 12px;
  font-weight: bold;
}

.instrument-selection-close-btn {
  background: transparent;
  border: none;
  color: #e0e0e0;
  cursor: pointer;
  padding: 4px;
  border-radius: 3px;
}

.instrument-selection-close-btn:hover {
  background-color: #4a4a4a;
}

.instrument-selection-top {
  height: 300px;
  position: relative;
  border-bottom: 1px solid #3a3a3a;
  overflow: hidden;
  background-image: 
    linear-gradient(rgba(0,0,0,0.35), rgba(0,0,0,0.35)),
    url('/resources/instrument_bg.png');
  background-size: cover; /* fill while keeping aspect ratio */
  background-position: center;
}

.instrument-preview {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.instrument-preview img {
  width: 256px;
  height: 256px;
  object-fit: contain;
  border-radius: 6px;
  opacity: 1;
}

.instrument-name-overlay {
  position: absolute;
  bottom: 16px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 12px;
  color: #e0e0e0;
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
  z-index: 1;
  font-size: 16px;
  font-weight: bold;
}

.instrument-selection-bottom {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0; /* allow children to scroll */
}

.instrument-groups, .instrument-list {
  overflow: hidden;
}

/* vertical divider between groups and instruments */
.instrument-groups {
  border-right: 1px solid #3a3a3a;
}

.instrument-groups-list, .instrument-instruments-list {
  height: 100%;
  overflow-y: auto;
}

.instrument-group-item, .instrument-instrument-item {
  padding: 8px 12px;
  /* remove per-item separators */
  border-bottom: none;
  cursor: pointer;
  font-size: 12px;
  color: #e0e0e0;
}

.instrument-group-item:hover, .instrument-instrument-item:hover {
  background-color: #3a3a3a;
}

.instrument-group-item.active, .instrument-instrument-item.active {
  background-color: #4a4a4a;
}

.chatbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between; /* left title, right actions */
  background-color: #3a3a3a;
  height: 40px;
  border-bottom: 1px solid #4a4a4a;
  padding: 0 15px;
}

.chatbox-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.chatbox-action-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #e0e0e0;
  font-size: 14px;
}

.chatbox-action-btn:hover {
  background-color: #4a4a4a;
  border-radius: 3px;
}

/* ChatBox export button wrapper and dropdown positioning */
.chatbox-export-wrapper {
  position: relative;
  display: inline-block;
}

.chatbox-export-btn {
  display: flex;
  align-items: center;
  gap: 4px;
}

.chatbox-export-dropdown-anchor {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 10000;
}

.chatbox-header h3 {
  color: #e0e0e0;
  font-size: 12px;
  font-weight: bold;
  margin: 0;
}

.chatbox-content {
  flex: 1;
  padding: 15px;
  color: #e0e0e0;
  font-size: 12px;
  overflow-y: auto;
}

/* Chat Messages */
.chatbox-messages {
  flex: 1;
  padding: 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message-container {
  width: 100%;
  word-wrap: break-word;
}

.message-user {
  width: 100%;
}

.message-assistant {
  width: 100%;
}

.message-content {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.4;
}

/* User message styling - lighter background like input */
.message-user .message-content {
  background-color: #3a3a3a;
  color: #e0e0e0;
  border: 1px solid #4a4a4a;
}

/* Assistant message styling - transparent */
.message-assistant .message-content {
  background-color: transparent;
  color: #e0e0e0;
  border: 1px solid #2a2a2a;
}

/* Input Area */
.chatbox-input-area {
  padding: 10px;
}

.chatbox-input {
  width: 100%;
  padding: 8px 12px;
  background-color: #4a4a4a;
  border: 1px solid #5a5a5a;
  border-radius: 6px;
  color: #e0e0e0;
  font-size: 12px;
  outline: none;
  resize: none;
  min-height: 36px;
  max-height: 120px;
}

.chatbox-input:focus {
  border-color: #6a6a6a;
  background-color: #4a4a4a;
}

.chatbox-input::placeholder {
  color: #999;
}


/* Markdown styling in messages */
.message-content h1,
.message-content h2,
.message-content h3 {
  margin: 8px 0 4px 0;
  color: #e0e0e0;
}

.message-content h3 {
  font-size: 14px;
}

.message-content p {
  margin: 4px 0;
}

.message-content ul,
.message-content ol {
  margin: 4px 0;
  padding-left: 16px;
}

.message-content li {
  margin: 2px 0;
}

.message-content code {
  background-color: #2a2a2a;
  padding: 2px 4px;
  border-radius: 3px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 11px;
}

.message-content pre {
  background-color: #1a1a1a;
  padding: 8px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 8px 0;
}

.message-content blockquote {
  border-left: 3px solid #5a5a5a;
  padding-left: 12px;
  margin: 8px 0;
  color: #ccc;
}

.message-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 8px 0;
  font-size: 11px;
}

.message-content th,
.message-content td {
  border: 1px solid #4a4a4a;
  padding: 4px 8px;
  text-align: left;
}

.message-content th {
  background-color: #3a3a3a;
  font-weight: bold;
}

textarea {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 12px;
  line-height: 1.4;
}

/* Abort link styling */
.abort-link {
  background: none !important;
  border: none !important;
  color: #7b68ee !important;
  text-decoration: underline !important;
  cursor: pointer !important;
  padding: 0 !important;
  font: inherit !important;
  font-size: 12px !important;
}

.abort-link:hover {
  color: #9b88ff !important;
  text-decoration: none !important;
}

/* Tool XML Expander */
.tool-xml-expander {
  margin-bottom: 8px;
}

.tool-xml-expander-header {
  color: #e0e0e0;
  cursor: pointer;
  user-select: none;
  padding: 4px 8px;
  /* background-color: #f5f5f5; */
  border: 1px solid #2a2a2a;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-xml-expander-arrow {
  font-size: 12px;
  color: #666;
}

.tool-xml-expander-title {
  /* font-family: 'Courier New', Monaco, 'Menlo', 'Ubuntu Mono', monospace; */
  font-size: 12px;
  font-weight: bold;
  color: #e0e0e0;
}

.tool-xml-expander-content {
  margin-top: 4px;
  padding: 8px;
  background-color: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-family: 'Courier New', Monaco, 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 12px;
  white-space: pre-wrap;
  overflow: auto;
  max-height: 200px;
  color: #333;
}

/* Settings Panel Styles */
.settings-panel {
  width: 100%;
  height: 100%;
  background-color: #1e1e1e;
  display: flex;
  flex-direction: column;
}

.settings-container {
  display: flex;
  height: 100%;
  overflow: hidden;
}

/* Settings Sidebar */
.settings-sidebar {
  width: 250px;
  background-color: #2d2d2d;
  border-right: 1px solid #3a3a3a;
  display: flex;
  flex-direction: column;
}

.settings-sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid #3a3a3a;
}

.settings-sidebar-header h2 {
  color: #e0e0e0;
  font-size: 18px;
  font-weight: 600;
  margin: 0;
}

.settings-close-btn {
  background: transparent;
  border: none;
  color: #e0e0e0;
  cursor: pointer;
  padding: 5px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.settings-close-btn:hover {
  background-color: #3a3a3a;
  color: #fff;
}

.settings-nav {
  display: flex;
  flex-direction: column;
  padding: 10px;
}

.settings-nav-item {
  background: transparent;
  border: none;
  color: #b0b0b0;
  padding: 12px 16px;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  margin-bottom: 2px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.settings-nav-item:hover {
  background-color: #3a3a3a;
  color: #e0e0e0;
}

.settings-nav-item.active {
  background-color: #4a4a4a;
  color: #fff;
}

/* Settings Content */
.settings-content {
  flex: 1;
  overflow-y: auto;
  background-color: #1e1e1e;
  display: flex;
  justify-content: center;
}

.settings-section {
  padding: 30px;
  width: 800px;
}

.settings-section-header {
  margin-bottom: 30px;
  border-bottom: 1px solid #3a3a3a;
  padding-bottom: 15px;
}

.settings-section-header h3 {
  color: #fff;
  font-size: 24px;
  font-weight: 600;
  margin: 0;
}

.settings-section-content {
  display: flex;
  flex-direction: column;
  gap: 30px;
  padding-bottom: 30px;
}

.settings-group {
  background-color: #2d2d2d;
  border-radius: 8px;
  padding: 20px;
  border: 1px solid #3a3a3a;
}

.settings-group h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 15px 0;
}

.settings-group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.settings-group-header h4 {
  margin: 0;
}

.settings-description {
  color: #b0b0b0;
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 15px;
}

.settings-item {
  margin-bottom: 15px;
}

.settings-item:last-child {
  margin-bottom: 0;
}

.settings-label {
  display: block;
  color: #e0e0e0;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 5px;
}

.settings-input, .settings-select, .settings-textarea {
  width: 100%;
  /* max-width: 300px; */
  padding: 8px 12px;
  background-color: #3a3a3a;
  border: 1px solid #555;
  border-radius: 4px;
  color: #e0e0e0;
  font-size: 14px;
  transition: border-color 0.2s ease;
  font-family: inherit;
}

.settings-input:focus, .settings-select:focus, .settings-textarea:focus {
  outline: none;
  border-color: #5a9fd4;
  box-shadow: 0 0 0 2px rgba(90, 159, 212, 0.2);
}

.settings-textarea {
  max-width: 600px;
  resize: vertical;
  min-height: 120px;
}

.settings-input[type="number"] {
  max-width: 100px;
}

/* Custom Checkbox */
.settings-checkbox-container {
  display: flex;
  align-items: center;
  cursor: pointer;
  color: #e0e0e0;
  font-size: 14px;
  user-select: none;
}

.settings-checkbox-container input[type="checkbox"] {
  display: none;
}

.settings-checkmark {
  width: 18px;
  height: 18px;
  background-color: #3a3a3a;
  border: 1px solid #555;
  border-radius: 3px;
  margin-right: 10px;
  position: relative;
  transition: all 0.2s ease;
}

.settings-checkbox-container input[type="checkbox"]:checked + .settings-checkmark {
  background-color: #5a9fd4;
  border-color: #5a9fd4;
}

.settings-checkbox-container input[type="checkbox"]:checked + .settings-checkmark::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Settings Buttons */
.settings-btn {
  background-color: #3a3a3a;
  border: 1px solid #555;
  color: #e0e0e0;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.settings-btn:hover {
  background-color: #4a4a4a;
  border-color: #666;
}

.settings-btn-primary {
  background-color: #5a9fd4;
  border-color: #5a9fd4;
  color: #fff;
}

.settings-btn-primary:hover {
  background-color: #4a8fc4;
  border-color: #4a8fc4;
}

.settings-btn-danger {
  background-color: #d45a5a;
  border-color: #d45a5a;
  color: #fff;
}

.settings-btn-danger:hover {
  background-color: #c44a4a;
  border-color: #c44a4a;
}

.settings-btn-danger:disabled {
  background-color: #555;
  border-color: #555;
  color: #888;
  cursor: not-allowed;
}

.settings-btn-small {
  padding: 6px 10px;
  font-size: 12px;
}

/* Templates List */
.templates-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 15px;
}

.template-item {
  background-color: #3a3a3a;
  border: 1px solid #555;
  border-radius: 6px;
  padding: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color 0.2s ease;
}

.template-item:hover {
  border-color: #666;
}

.template-info {
  flex: 1;
}

.template-name {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 5px 0;
}

.template-description {
  color: #b0b0b0;
  font-size: 14px;
  margin: 0 0 5px 0;
}

.template-tracks {
  color: #888;
  font-size: 12px;
  font-weight: 500;
}

.template-actions {
  display: flex;
  gap: 8px;
}

/* File Import Modal */
.file-import-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10001;
  backdrop-filter: blur(2px);
}

.file-import-modal {
  background-color: #2d2d2d;
  border: 1px solid #3a3a3a;
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  width: 90%;
  max-width: 500px;
  max-height: 80vh;
  overflow: hidden;
  animation: fileImportFadeIn 0.2s ease-out;
}

@keyframes fileImportFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.file-import-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid #3a3a3a;
  background-color: #252525;
}

.file-import-title {
  color: #e0e0e0;
  font-size: 18px;
  font-weight: 600;
  margin: 0;
}

.file-import-close-btn {
  background: transparent;
  border: none;
  color: #b0b0b0;
  cursor: pointer;
  padding: 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all 0.2s ease;
}

.file-import-close-btn:hover {
  background-color: #3a3a3a;
  color: #e0e0e0;
}

.file-import-drop-zone {
  padding: 40px 20px;
  margin: 20px;
  border: 2px dashed #555;
  border-radius: 8px;
  background-color: #1e1e1e;
  transition: all 0.3s ease;
  cursor: pointer;
}

.file-import-drop-zone:hover {
  border-color: #7b68ee;
  background-color: rgba(123, 104, 238, 0.05);
}

.file-import-drop-zone.drag-over {
  border-color: #7b68ee;
  background-color: rgba(123, 104, 238, 0.1);
  transform: scale(1.02);
}

.file-import-drop-content {
  text-align: center;
  color: #e0e0e0;
}

.file-import-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.7;
}

.file-import-description {
  font-size: 18px;
  font-weight: 500;
  margin: 0 0 8px 0;
  color: #e0e0e0;
}

.file-import-formats {
  font-size: 14px;
  color: #b0b0b0;
  margin: 0 0 24px 0;
}

.file-import-divider {
  position: relative;
  margin: 24px 0;
  text-align: center;
}

.file-import-divider::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-color: #3a3a3a;
}

.file-import-divider span {
  background-color: #1e1e1e;
  padding: 0 12px;
  color: #888;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.file-import-browse-btn {
  display: inline-block;
  background-color: #5a9fd4;
  color: #fff;
  padding: 12px 24px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.file-import-browse-btn:hover {
  background-color: #4a8fc4;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(90, 159, 212, 0.3);
}

/* Global Loading Overlay */
.global-loading-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  z-index: 20000;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: all; /* block interactions */
}

.global-loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.global-loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.25);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: globalSpinner 1s linear infinite;
}

.global-loading-text {
  color: #e0e0e0;
  font-size: 14px;
}

@keyframes globalSpinner {
  to { transform: rotate(360deg); }
}

/* Processing wave animation */
.processing-wave {
  background: linear-gradient(
    90deg,
    rgba(135, 206, 250, 0.5) 0%,
    rgba(135, 206, 250, 0.8) 25%,
    rgb(171, 218, 250) 50%,
    rgba(135, 206, 250, 0.8) 75%,
    rgba(135, 206, 250, 0.5) 100%
  );
  background-size: 200% 100%;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: wave 2s linear infinite;
}

@keyframes wave {
  0% {
    background-position: 200% 0%;
  }
  100% {
    background-position: -200% 0%;
  }
}