.panel-section {
  border-bottom: 1px solid var(--border);
  padding: 12px;
}

.panel-section-header {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-2);
  margin: 0 0 10px 0;
  font-weight: 500;
}

/* Upload cards */
.upload-card {
  margin-bottom: 10px;
}
.upload-card:last-child { margin-bottom: 0; }

.upload-card-label {
  font-size: 11px;
  color: var(--text-1);
  margin-bottom: 4px;
  font-weight: 500;
}

.drop-zone {
  border: 1px dashed var(--border);
  background: var(--bg-2);
  border-radius: 6px;
  height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  font-size: 12px;
  color: var(--text-2);
  text-align: center;
  gap: 4px;
}
.drop-zone:hover { border-color: var(--accent); background: var(--bg-3); color: var(--text-1); }
.drop-zone.drag-over { border-color: var(--accent); border-style: solid; background: color-mix(in srgb, var(--accent) 8%, var(--bg-2)); }

.drop-zone-loaded {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  font-size: 12px;
  color: var(--text-0);
  cursor: default;
}
.drop-zone-loaded:hover { border-color: var(--border); background: var(--bg-2); }

.drop-zone-info { flex: 1; min-width: 0; }
.drop-zone-filename {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.drop-zone-meta { color: var(--text-2); font-size: 11px; }

.drop-zone-remove {
  background: none;
  border: none;
  color: var(--text-2);
  cursor: pointer;
  padding: 4px;
  border-radius: 3px;
  font-size: 14px;
  line-height: 1;
  flex-shrink: 0;
}
.drop-zone-remove:hover { color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); }

/* Display section */
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
}
.checkbox-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text-0);
  user-select: none;
  width: 100%;
}
.checkbox-row input[type="checkbox"] {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-2);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background 0.1s, border-color 0.1s;
}
.checkbox-row input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.checkbox-row input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 3px; top: 1px;
  width: 8px; height: 5px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
}
.checkbox-row input[type="checkbox"]:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Sliders */
.slider-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px 0;
}
.slider-row-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.slider-label { color: var(--text-1); }
.slider-value { font-family: var(--mono); font-size: 12px; color: var(--text-0); }
.slider-row input[type="range"] {
  width: 100%;
  height: 12px;
  appearance: none;
  background: transparent;
  cursor: pointer;
}
.slider-row input[type="range"]::-webkit-slider-track {
  height: 4px;
  background: var(--bg-3);
  border-radius: 2px;
}
.slider-row input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: -5px;
  transition: transform 0.1s;
}
.slider-row input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* View buttons */
.view-btn-group {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.view-btn-group .btn { flex: 1; }

/* Right panel tabs */
.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.panel-tab {
  flex: 1;
  padding: 10px 4px;
  text-align: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  user-select: none;
}
.panel-tab:hover { color: var(--text-0); }
.panel-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.panel-tab-content { display: none; flex: 1; overflow-y: auto; }
.panel-tab-content.active { display: flex; flex-direction: column; }

/* Collapsible sections */
.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-2);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  user-select: none;
}
.collapsible-header:hover { color: var(--text-1); background: var(--bg-2); }
.collapsible-arrow { font-size: 10px; transition: transform 0.2s; }
.collapsible-header.open .collapsible-arrow { transform: rotate(90deg); }
.collapsible-body { overflow: hidden; }
.collapsible-body.collapsed { display: none; }