* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --sidebar-width: 300px;
  --bg-dark: #1a1a2e;
  --bg-sidebar: #16213e;
  --bg-header: #0f3460;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --text-dim: #606070;
  --accent: #53a8b6;
  --accent-hover: #79c7d4;
  --badge-bg: #e94560;
  --border-color: #2a2a4a;
  --highlight: #e94560;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
}

body {
  display: flex;
}

/* Sidebars */
.sidebar {
  width: var(--sidebar-width);
  min-width: 200px;
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-color);
  overflow: hidden;
  position: relative;
}

#sidebar-left {
  max-width: 50vw;
}

.resize-handle {
  position: absolute;
  top: 0;
  right: 0;
  width: 5px;
  height: 100%;
  cursor: col-resize;
  background: transparent;
  z-index: 10;
  transition: background 0.2s;
}

.resize-handle:hover,
.resize-handle.dragging {
  background: var(--accent);
}

#sidebar-right {
  border-right: none;
  border-left: 1px solid var(--border-color);
}

.sidebar-header {
  padding: 16px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  color: var(--accent);
}

#search-box {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

#search-box:focus {
  border-color: var(--accent);
}

#search-box::placeholder {
  color: var(--text-dim);
}

/* Hierarchy tree */
.tree-container {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.tree-container::-webkit-scrollbar {
  width: 6px;
}

.tree-container::-webkit-scrollbar-track {
  background: transparent;
}

.tree-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.tree-node {
  user-select: none;
}

.tree-node-content {
  display: flex;
  align-items: center;
  padding: 3px 8px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.4;
  transition: background 0.15s;
}

.tree-node-content:hover {
  background: rgba(83, 168, 182, 0.1);
}

.tree-node-content.selected {
  background: rgba(83, 168, 182, 0.2);
}

.tree-toggle {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform 0.15s;
}

.tree-toggle.expanded {
  transform: rotate(90deg);
}

.tree-toggle.leaf {
  visibility: hidden;
}

.tree-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  flex-shrink: 0;
}

.tree-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-label.has-data {
  font-weight: 600;
  color: var(--text-primary);
}

.tree-label.no-data {
  color: var(--text-dim);
}

.tree-label.no-mesh {
  font-style: italic;
}

.tree-color-dot {
  box-sizing: border-box;
}

.tree-badge {
  background: rgba(40, 40, 60, 0.8);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 8px;
  margin-left: 6px;
  flex-shrink: 0;
  white-space: nowrap;
}

.badge-direct {
  color: #ff6b81;
}

.badge-sep {
  color: #606070;
  margin: 0 1px;
}

.badge-total {
  color: #53a8b6;
}

.tree-children {
  display: none;
  padding-left: 5px;
}

.tree-children.expanded {
  display: block;
}

.tree-node.search-hidden {
  display: none;
}

/* Center viewer */
#viewer {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#brain-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Tooltip */
.tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(15, 52, 96, 0.95);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 13px;
  max-width: 250px;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.tooltip.hidden {
  display: none;
}

.tooltip-name {
  font-weight: 600;
  color: var(--text-primary);
}

.tooltip-acronym {
  color: var(--accent);
  font-size: 12px;
}

.tooltip-info {
  color: var(--text-secondary);
  font-size: 11px;
  margin-top: 2px;
}

/* Loading overlay */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(26, 26, 46, 0.9);
  z-index: 200;
  transition: opacity 0.5s;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 16px;
}

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

#loading-text {
  color: var(--text-secondary);
  font-size: 14px;
}

/* CCF attribution */
.ccf-attribution {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.35);
  text-decoration: none;
  font-size: 12px;
  z-index: 50;
  transition: color 0.2s;
}

.ccf-attribution:hover {
  color: rgba(255,255,255,0.8);
}

/* Orientation buttons */
.orient-buttons {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 50;
}

.orient-buttons button {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: rgba(15, 52, 96, 0.85);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  backdrop-filter: blur(4px);
}

.orient-buttons button:hover {
  background: rgba(83, 168, 182, 0.3);
  color: var(--text-primary);
}

/* Controls hint */
.controls-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 52, 96, 0.8);
  color: var(--text-secondary);
  font-size: 11px;
  padding: 6px 14px;
  border-radius: 20px;
  pointer-events: none;
  backdrop-filter: blur(4px);
  white-space: nowrap;
}

.last-updated:not(:empty) {
  margin-left: 8px;
  padding-left: 8px;
  border-left: 1px solid var(--text-dim);
  color: var(--text-dim);
  font-size: 10px;
}

.github-link {
  position: absolute;
  bottom: 12px;
  right: 12px;
  color: rgba(255,255,255,0.35);
  text-decoration: none;
  z-index: 50;
  transition: color 0.2s;
}

.github-link:hover {
  color: rgba(255,255,255,0.8);
}

.created-by-link {
  position: absolute;
  bottom: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  font-size: 12px;
  z-index: 50;
  transition: color 0.2s;
}

.created-by-link:hover {
  color: rgba(255,255,255,0.8);
}

.cn-logo {
  height: 18px;
  vertical-align: middle;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.created-by-link:hover .cn-logo {
  opacity: 1;
}

/* Region panel (right sidebar) */
.region-panel {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.region-panel::-webkit-scrollbar {
  width: 6px;
}

.region-panel::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.placeholder-text {
  color: var(--text-dim);
  font-size: 13px;
  text-align: center;
  padding-top: 40px;
  line-height: 1.6;
}

.region-header {
  margin-bottom: 16px;
}

.region-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.region-acronym {
  font-size: 14px;
  color: var(--accent);
  margin-top: 2px;
}

.region-color-bar {
  width: 100%;
  height: 4px;
  border-radius: 2px;
  margin-top: 8px;
}

.region-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.stat-item {
  text-align: center;
  flex: 1;
}

.stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.dandiset-list-header {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.dandiset-list-hint {
  font-size: 10px;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-dim);
  font-style: italic;
}

/* Dandiset cards */
.dandiset-card {
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
  margin-bottom: 6px;
  background: rgba(83, 168, 182, 0.1);
  border: 1px solid rgba(83, 168, 182, 0.2);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.dandiset-card:hover {
  background: rgba(83, 168, 182, 0.25);
  border-color: var(--accent);
  transform: translateX(2px);
}

.dandiset-card:active {
  transform: translateX(0);
  background: rgba(83, 168, 182, 0.35);
}

.dandiset-card-id {
  color: var(--accent);
  font-size: 13px;
  font-family: 'SF Mono', 'Menlo', 'Monaco', monospace;
  font-weight: 700;
  background: rgba(83, 168, 182, 0.15);
  padding: 2px 8px;
  border-radius: 4px;
}

.dandiset-card-top {
  display: flex;
  align-items: center;
  width: 100%;
}

.dandiset-card-count {
  color: var(--text-secondary);
  font-size: 11px;
  margin-left: 10px;
  flex: 1;
}

.dandiset-card-title {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.dandiset-card-title:empty {
  display: none;
}

.dandiset-detail-title {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.4;
}

.dandiset-detail-title:empty {
  display: none;
}

.dandiset-card-ext {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.dandiset-card-ext:hover {
  color: var(--accent-hover);
  background: rgba(83, 168, 182, 0.2);
  border-color: var(--accent);
}

/* Dandiset detail view - external link */
.dandiset-external-link {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 12px;
  background: rgba(83, 168, 182, 0.15);
  border-radius: 6px;
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
  transition: background 0.15s;
}

.dandiset-external-link:hover {
  background: rgba(83, 168, 182, 0.3);
}

/* Region cards (in dandiset view) */
.region-card {
  display: flex;
  align-items: center;
  padding: 8px 10px;
  margin-bottom: 4px;
  background: rgba(83, 168, 182, 0.08);
  border: 1px solid rgba(83, 168, 182, 0.15);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.region-card:hover {
  background: rgba(83, 168, 182, 0.2);
  border-color: var(--accent);
  transform: translateX(2px);
}

.region-card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  flex-shrink: 0;
}

.region-card-label {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-right: 8px;
}

.region-card-name {
  color: var(--text-secondary);
  font-size: 12px;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Dandiset filter bar (left sidebar) */
.dandiset-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(83, 168, 182, 0.15);
  border-bottom: 1px solid rgba(83, 168, 182, 0.3);
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
}

.dandiset-filter-bar.hidden {
  display: none;
}

#dandiset-filter-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#dandiset-filter-clear {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.15s;
}

#dandiset-filter-clear:hover {
  color: var(--text-primary);
}

/* Subject filter bar (left sidebar, below dandiset bar) */
.subject-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: rgba(233, 69, 96, 0.12);
  border-bottom: 1px solid rgba(233, 69, 96, 0.25);
  font-size: 12px;
  color: var(--highlight);
  font-weight: 600;
}

.subject-filter-bar.hidden {
  display: none;
}

#subject-filter-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#subject-filter-clear {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.15s;
}

#subject-filter-clear:hover {
  color: var(--text-primary);
}

/* Dandiset-inactive tree items */
.tree-label.dandiset-inactive {
  color: var(--text-dim);
}

.tree-color-dot.dandiset-inactive {
  opacity: 0.3;
}

/* Override no-data dim styling for active ancestors in dandiset filter mode */
.tree-label.no-data.dandiset-active {
  color: var(--text-primary);
}

.tree-color-dot.dandiset-active {
  opacity: 1;
}

/* External link on region name */
.region-ext-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-left: 6px;
  transition: color 0.15s;
}

.region-ext-link:hover {
  color: var(--accent-hover);
}

/* Asset cards (in dandiset detail view) */
.asset-card {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  margin-bottom: 6px;
  background: rgba(83, 168, 182, 0.08);
  border: 1px solid rgba(83, 168, 182, 0.15);
  border-radius: 8px;
  gap: 10px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.asset-card:hover {
  background: rgba(83, 168, 182, 0.15);
  border-color: rgba(83, 168, 182, 0.3);
}

.asset-card-filename {
  flex: 1;
  font-family: 'SF Mono', 'Menlo', 'Monaco', monospace;
  font-size: 12px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.asset-card-session-count {
  color: var(--text-secondary);
  font-size: 11px;
}

.asset-card-region-count {
  color: var(--text-secondary);
  font-size: 11px;
  flex: 1;
}

.asset-card.asset-card-selected {
  border-color: var(--accent);
  background: rgba(83, 168, 182, 0.2);
}

.asset-card-ext {
  flex-shrink: 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.asset-card-ext:hover {
  color: var(--accent-hover);
  background: rgba(83, 168, 182, 0.2);
  border-color: var(--accent);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 10px 0;
  margin-top: 4px;
}

.pagination-btn {
  background: rgba(83, 168, 182, 0.15);
  border: 1px solid rgba(83, 168, 182, 0.3);
  border-radius: 6px;
  color: var(--accent);
  font-size: 12px;
  padding: 4px 12px;
  cursor: pointer;
  transition: background 0.15s;
}

.pagination-btn:hover:not(:disabled) {
  background: rgba(83, 168, 182, 0.3);
}

.pagination-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.pagination-info {
  color: var(--text-secondary);
  font-size: 12px;
}

/* Viewer controls (alpha sliders) */
.viewer-controls {
  position: absolute;
  top: 12px;
  left: 56px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 50;
  background: rgba(15, 52, 96, 0.85);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 12px;
  backdrop-filter: blur(4px);
}

.viewer-control-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.viewer-control-row.hidden {
  display: none;
}

.viewer-controls label {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  width: 62px;
}

.viewer-controls input[type="range"] {
  width: 80px;
}

#region-alpha {
  accent-color: var(--accent);
}

#electrode-alpha {
  accent-color: #ff4466;
}

/* Electrode indicator on subject cards */
.electrode-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff4466;
  flex-shrink: 0;
  box-shadow: 0 0 4px rgba(255, 68, 102, 0.6);
}

/* Region visibility toggles (floating overlay in 3D viewer) */
.region-toggles-overlay {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 50;
  width: 180px;
  background: rgba(15, 52, 96, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  backdrop-filter: blur(4px);
  overflow: hidden;
}

.region-toggles-overlay.hidden {
  display: none;
}

.region-toggles-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
}

.region-toggles-collapse-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 10px;
  cursor: pointer;
  padding: 2px 4px;
  line-height: 1;
  transition: color 0.15s;
}

.region-toggles-collapse-btn:hover {
  color: var(--text-primary);
}

.region-toggles-overlay.collapsed .region-toggle-list {
  display: none;
}

.region-toggle-all-label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.region-toggle-list {
  max-height: 300px;
  overflow-y: auto;
  padding: 2px 0;
}

.region-toggle-list::-webkit-scrollbar {
  width: 4px;
}

.region-toggle-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 2px;
}

.region-toggle-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-primary);
  transition: background 0.1s;
}

.region-toggle-row:hover {
  background: rgba(255,255,255,0.05);
}

.region-toggle-row input[type="checkbox"] {
  margin: 0;
  flex-shrink: 0;
  accent-color: var(--accent);
}

.region-toggle-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.region-toggle-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.region-toggle-row.toggle-hidden {
  display: none;
}

/* No-data message for right panel */
.no-data-msg {
  color: var(--text-dim);
  font-size: 13px;
  font-style: italic;
}