/* 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: 16px;
  color: #e0e0e0;
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
  z-index: 1;
  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;
}