/* ── Collapsible Sub-panels ────────────────────────── */

.collapsible {
  border-bottom: 1px solid var(--border-subtle);
}

.collapsible:last-child {
  border-bottom: none;
}

.collapsible-header {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 8px 0;
  background: none;
  border: none;
  color: var(--text-heading);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.15s;
}

.collapsible-header:hover {
  color: var(--text-bright);
}

.collapse-arrow {
  display: inline-block;
  font-size: 10px;
  transition: transform 0.2s ease;
}

.collapsible.open .collapse-arrow {
  transform: rotate(90deg);
}

.collapsible-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.collapsible.open .collapsible-body {
  max-height: 500px;
}

/* Data collapsible fills available panel height */
.collapsible--data {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.collapsible--data .collapsible-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.collapsible--data.open .collapsible-body {
  max-height: 9999px;
}

.collapsible--data .data-upload-block {
  flex-shrink: 0;
}

.collapsible--data #data-panel-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}