/* ==========================================================================
   Multi-View Pose Proofreading GUI - Dark Theme Stylesheet
   ========================================================================== */

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */

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

:root {
  --bg-primary: #1a1a1a;
  --bg-secondary: #222222;
  --bg-tertiary: #2a2a2a;
  --bg-button: #333333;
  --bg-button-hover: #555555;
  --text-primary: #e0e0e0;
  --text-secondary: #aaaaaa;
  --text-muted: #777777;
  --accent: #667eea;
  --accent-hover: #7b91f5;
  --accent-dim: rgba(102, 126, 234, 0.25);
  --border-color: #3a3a3a;
  --border-light: #444444;
  --error-color: #e74c3c;
  --warning-color: #f39c12;
  --success-color: #2ecc71;
  --info-panel-width: 300px;
  --controls-bar-height: 56px;
  --status-bar-height: 28px;
  --menu-bar-height: 32px;
  --toolbar-height: 36px;
  --timeline-height: 200px;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Scrollbar Styling
   -------------------------------------------------------------------------- */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-button-hover);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--bg-button-hover) var(--bg-secondary);
}

/* --------------------------------------------------------------------------
   App Container
   Layout: menu-bar -> main-content -> toolbar -> timeline -> controls-bar -> status-bar
   -------------------------------------------------------------------------- */

.app-container {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-primary);
}

/* --------------------------------------------------------------------------
   Menu Bar
   -------------------------------------------------------------------------- */

.menu-bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0;
  height: var(--menu-bar-height);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  user-select: none;
}

.menu-item {
  position: relative;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.menu-item:hover {
  background: var(--bg-button);
  color: var(--text-primary);
}

.menu-item.active,
.menu-item.open {
  background: var(--accent-dim);
  color: var(--accent);
}

.menu-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  min-width: 200px;
  z-index: 100;
  padding: 4px 0;
}

.menu-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast);
}

.menu-dropdown-item:hover {
  background: var(--accent-dim);
}

.menu-dropdown-item .trail-check {
  display: inline-block;
  width: 14px;
  color: var(--accent, #4ea1ff);
  font-weight: bold;
}

/* Nested submenu (e.g. Tracks ▸ Node Trails ▸ Off/10/50/100). The submenu is a
   .menu-dropdown, so the global menu-close handler stamps it with an inline
   display:none — the :hover rule needs !important to win over that. */
.menu-dropdown-item.has-submenu {
  position: relative;
}

.menu-dropdown-item.has-submenu .submenu-arrow {
  margin-left: 24px;
  font-size: 10px;
  color: var(--text-muted);
}

.menu-dropdown .submenu {
  top: -5px;                /* align first submenu item with the parent row */
  left: 100%;
  min-width: 140px;
}

.menu-dropdown-item.has-submenu:hover > .submenu {
  display: block !important;
}

.menu-dropdown-item .shortcut {
  margin-left: 24px;
  font-size: 11px;
  color: var(--text-muted);
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

.menu-dropdown-item.disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.5;
}

.menu-dropdown-item.disabled:hover {
  background: transparent;
}

.menu-has-submenu {
  position: relative;
}

.menu-submenu {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  min-width: 160px;
  z-index: 101;
  padding: 4px 0;
}

.menu-has-submenu:hover > .menu-submenu {
  display: block;
}

.menu-submenu-item {
  padding: 5px 14px;
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  white-space: nowrap;
}

.menu-submenu-item:hover {
  background: var(--accent-dim);
}

.menu-submenu-item.menu-submenu-new {
  color: var(--accent-color);
  border-top: 1px solid var(--border-color);
  margin-top: 2px;
  padding-top: 6px;
}

.menu-separator {
  height: 1px;
  background: var(--border-color);
  margin: 4px 0;
}

/* --------------------------------------------------------------------------
   Main Content (video grid + 3D viewport + info panel)
   -------------------------------------------------------------------------- */

.main-content {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.video-grid-section {
  flex: 1;
  display: flex;
  flex-direction: row;
  min-width: 0;
  min-height: 0;
}

/* --------------------------------------------------------------------------
   Session Strip sidebar (far left)
   -------------------------------------------------------------------------- */

/* Session strip sidebar (far left) */
.session-strip {
    width: 64px;
    min-width: 40px;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
    overflow: hidden;
    transition: width 0.15s ease, opacity 0.15s ease;
    position: relative;
}

.session-strip-resize {
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    cursor: col-resize;
    background: var(--border-color);
    opacity: 0;
    transition: opacity 0.15s;
    z-index: 5;
}

.session-strip-resize:hover,
.session-strip-resize.dragging {
    opacity: 1;
}

.session-strip.session-strip-hidden {
    width: 0;
    min-width: 0;
    border-right: none;
    opacity: 0;
    pointer-events: none;
}

#sessionHoverZone {
    position: fixed;
    left: 0;
    top: 0;
    width: 6px;
    height: 100%;
    z-index: 9999;
}

.session-strip-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 0;
}

.session-strip-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4px;
    margin: 4px 4px;
    cursor: pointer;
    border-radius: 4px;
    border: 2px solid var(--border-color);
    transition: background var(--transition-fast), border-color var(--transition-fast);
    position: relative;
}

.session-strip-item:hover {
    background: var(--bg-button);
}

.session-strip-item.active {
    background: var(--accent-dim);
    border-color: var(--accent);
}

.session-strip-icon {
    width: 32px;
    height: 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 2px;
}

.session-strip-icon .cam-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
}

.session-strip-item.active .cam-dot {
    background: var(--accent);
}

.session-strip-label {
    font-size: 8px;
    color: var(--text-muted);
    margin-top: 2px;
    max-width: 40px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: center;
}

.session-strip-add {
    width: 32px;
    height: 24px;
    margin: 4px auto 8px;
    background: var(--bg-button);
    border: 1px dashed var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.session-strip-add:hover {
    background: var(--bg-button-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   View Strip (left sidebar with video thumbnails)
   -------------------------------------------------------------------------- */

.view-strip {
  width: 64px;
  min-width: 64px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  user-select: none;
}

.view-strip-header {
  padding: 6px 0;
  text-align: center;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.view-strip-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 4px 0;
}

.view-strip-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 4px;
  margin: 2px 4px;
  border-radius: 4px;
  cursor: grab;
  transition: background var(--transition-fast);
  position: relative;
}

.view-strip-item:hover {
  background: var(--bg-button);
}

.view-strip-item.active {
  background: var(--accent-dim);
  outline: 1px solid var(--accent);
}

.view-strip-item.strip-selected {
  outline: 2px solid rgba(255, 221, 68, 0.5);
  background: rgba(255, 221, 68, 0.1);
}

.view-strip-item.strip-multi-selected {
  outline: 2px solid rgba(100, 180, 255, 0.7);
  background: rgba(100, 180, 255, 0.15);
}

.view-strip-item.dragging {
  opacity: 0.5;
}

.view-strip-item .strip-thumb {
  width: 48px;
  height: 36px;
  background: #111;
  border-radius: 3px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.view-strip-item .strip-thumb canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.view-strip-item .strip-label {
  font-size: 9px;
  color: var(--text-secondary);
  margin-top: 3px;
  text-align: center;
  max-width: 56px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.view-strip-item .strip-status {
  position: absolute;
  top: 4px;
  right: 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success-color);
}

.view-strip-item .strip-status.in-dock {
  background: var(--accent);
}

/* --------------------------------------------------------------------------
   Video Dock (main viewing area)
   -------------------------------------------------------------------------- */

.video-dock {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  position: relative;
}

.video-dock-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 13px;
  pointer-events: none;
  z-index: 1;
}

.video-dock-empty.hidden {
  display: none;
}

.dock-empty-icon {
  font-size: 36px;
  margin-bottom: 8px;
  opacity: 0.4;
}

/* --------------------------------------------------------------------------
   3D Viewport
   -------------------------------------------------------------------------- */

.viewport3d-container {
  width: 400px;
  background: #1a1a1a;
  border-left: 1px solid var(--border-color);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  transition: width var(--transition-normal);
}

.viewport3d-message {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
  padding: 20px;
  z-index: 2;
  pointer-events: none;
}

.viewport3d-message.hidden {
  display: none;
}

.viewport3d-container.collapsed {
  width: 0;
  overflow: hidden;
  border-left: none;
}

.viewport3d-container canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viewport3d-show-cam-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 10;
  padding: 4px 10px;
  font-size: 11px;
  background: rgba(30, 30, 30, 0.85);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.viewport3d-show-cam-btn:hover {
  background: rgba(50, 50, 50, 0.95);
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   Dockview Integration
   -------------------------------------------------------------------------- */

.video-dock .dv-dockview {
  width: 100%;
  height: 100%;
}

.dockview-theme-abyss {
  --dv-background-color: #1a1a1a;
  --dv-activegroup-visiblepanel-tab-background-color: #2a2a2a;
  --dv-activegroup-hiddenpanel-tab-background-color: #222222;
  --dv-inactivegroup-visiblepanel-tab-background-color: #252525;
  --dv-inactivegroup-hiddenpanel-tab-background-color: #1e1e1e;
  --dv-tab-font-size: 11px;
  --dv-paneview-header-border-color: #3a3a3a;
  --dv-separator-border: #3a3a3a;
}

.dv-dockview .video-cell {
  position: absolute;
  inset: 0;
}

/* Bypass dockview panel activation — allow direct interaction in any panel */
.dv-dockview .dv-content-container {
  pointer-events: none;
}
.dv-dockview .dv-content-container > * {
  pointer-events: auto;
}

/* --------------------------------------------------------------------------
   Video Cell
   -------------------------------------------------------------------------- */

.video-cell {
  position: relative;
  overflow: hidden;
  background: #111111;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-cell .canvas-wrapper {
  position: relative;
  display: inline-block;
  max-width: 100%;
  max-height: 100%;
  line-height: 0;
}

.video-cell .canvas-wrapper canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
}

.video-cell .canvas-wrapper .overlay-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
  cursor: default;
}

/* View label (top-left corner) */
.video-cell .view-label {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 3px 10px;
  background: rgba(0, 0, 0, 0.7);
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  border-radius: 4px;
  pointer-events: none;
  z-index: 5;
  user-select: none;
}

/* Box zoom overlay */
.box-zoom-overlay {
  position: absolute;
  border: 2px dashed var(--accent);
  background: rgba(102, 126, 234, 0.1);
  pointer-events: none;
  z-index: 15;
}

/* Zoomed state */
.video-cell.zoomed {
  z-index: 10;
}

/* Camera click highlight from 3D viewport */
.video-cell.camera-highlighted {
  outline: 3px solid #ffdd44;
  outline-offset: -3px;
  z-index: 11;
}

/* When not zoomed: highlight around the video frame (canvas-wrapper) */
.video-cell.video-selected:not(.zoomed) .canvas-wrapper {
  outline: 2px solid rgba(255, 221, 68, 0.5);
  outline-offset: -2px;
  border-radius: 2px;
}

/* When zoomed: highlight via pseudo-element overlay (always visible, above transformed content) */
.video-cell.video-selected.zoomed::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid rgba(255, 221, 68, 0.5);
  pointer-events: none;
  z-index: 18;
}

.unzoom-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 3px 8px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  cursor: pointer;
  z-index: 6;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.unzoom-btn:hover {
  background: var(--accent);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   Toolbar (between video grid and controls)
   -------------------------------------------------------------------------- */

.toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  height: var(--toolbar-height);
  padding: 0 8px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  user-select: none;
  overflow: visible;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 8px;
  border-right: 1px solid var(--border-color);
}

.toolbar-group:last-child {
  border-right: none;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.toolbar-btn:hover {
  background: var(--bg-button-hover);
  color: var(--text-primary);
}

.toolbar-btn:active {
  color: var(--accent);
}

.toolbar-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
}

#tbSessions {
  width: 64px;
  padding: 0;
  margin-left: -16px;
}

/* Toolbar dropdown menu (for Assign button) */
.toolbar-dropdown-menu {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  min-width: 120px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  padding: 4px 0;
}

.toolbar-dropdown-item {
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.toolbar-dropdown-item:hover {
  background: var(--accent-dim);
}

.toolbar-dropdown-label {
  padding: 6px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: default;
  user-select: none;
}

.toolbar-dropdown-sub {
  padding-left: 24px;
}

/* Flyout submenu for nested dropdown items */
.toolbar-dropdown-item.has-flyout {
  position: relative;
}

.toolbar-flyout-menu {
  display: none;
  position: absolute;
  left: 100%;
  top: -4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  padding: 4px 0;
  min-width: 140px;
  z-index: 10001;
}

.toolbar-dropdown-item.has-flyout:hover > .toolbar-flyout-menu {
  display: block;
}

/* Triangulate / Triangulate All split dropdowns (DLT vs Bundle Adjustment) */
.tri-dropdown {
  position: relative;
  display: inline-flex;
}

.tri-caret {
  margin-left: 4px;
  font-size: 9px;
  opacity: 0.7;
}

.tri-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  min-width: 180px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  padding: 4px 0;
  z-index: 200;
  /* Pure-CSS "hover intent": no display:none (keeps it out of layout via
     position:absolute), flush under the button (margin-top:0) so the cursor
     never crosses a gap, and a delayed visibility transition keeps the menu
     up for a short grace period after the cursor leaves. */
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: opacity 0.12s ease, transform 0.12s ease,
    visibility 0s linear 0.35s;
}

.tri-dropdown:hover .tri-dropdown-menu,
.tri-dropdown.open .tri-dropdown-menu {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  transition-delay: 0s;
}

.tri-dropdown-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.tri-dropdown-item:hover {
  background: var(--accent-dim);
}

.tri-dropdown-hint {
  font-size: 10px;
  color: var(--text-muted);
}

/* Multi-frame assignment modal */
.multi-frame-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 20000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.multi-frame-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  min-width: 420px;
  max-width: 500px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  color: var(--text-primary);
}

.multi-frame-modal h3 {
  margin: 0 0 16px 0;
  font-size: 15px;
  font-weight: 600;
}

.multi-frame-modal p {
  margin: 0 0 16px 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.multi-frame-modal .modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

/* Rename Track / Identity modal */
.rename-list {
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-bottom: 12px;
}

.rename-list-item {
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rename-list-item:last-child {
  border-bottom: none;
}

.rename-list-item:hover {
  background: var(--bg-tertiary);
}

.rename-list-item.selected {
  background: #ffd54a;
  color: #1a1a1a;
}

.rename-name-label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.rename-name-input {
  width: 100%;
  box-sizing: border-box;
  padding: 6px 8px;
  font-size: 13px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

/* Read-only (reference) list, e.g. current tracks in the New modal */
.rename-list.readonly .rename-list-item {
  cursor: default;
}

.rename-list.readonly .rename-list-item:hover {
  background: transparent;
}

/* Delete modal: red warning line + per-camera count total */
.delete-warning {
  color: #e5484d;
  font-size: 12px;
  margin: 0 0 12px;
  min-height: 14px;
}

.delete-total-row td {
  font-weight: 700;
  border-top: 1px solid var(--border-color);
}

.multi-frame-modal button.danger {
  background: #e5484d;
  border-color: #e5484d;
  color: #fff;
}

.multi-frame-modal button.danger:hover {
  background: #d13b40;
  border-color: #d13b40;
}

.multi-frame-modal button {
  padding: 6px 16px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 13px;
}

.multi-frame-modal button.primary {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
}

.multi-frame-modal button:hover {
  filter: brightness(1.15);
}

/* Dual range slider */
.range-slider-container {
  position: relative;
  height: 36px;
  margin: 16px 0;
}

.range-slider-track {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  transform: translateY(-50%);
}

.range-slider-fill {
  position: absolute;
  top: 50%;
  height: 4px;
  background: var(--accent-color);
  border-radius: 2px;
  transform: translateY(-50%);
}

.range-slider-container input[type="range"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  pointer-events: none;
  margin: 0;
}

.range-slider-container input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-color);
  border: 2px solid #fff;
  cursor: pointer;
  pointer-events: all;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.range-slider-container input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-color);
  border: 2px solid #fff;
  cursor: pointer;
  pointer-events: all;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

/* Frame input fields row */
.frame-inputs-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 12px 0;
}

.frame-inputs-row label {
  font-size: 12px;
  color: var(--text-secondary);
}

.frame-inputs-row input[type="number"] {
  width: 72px;
  padding: 4px 8px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 13px;
  text-align: center;
}

.frame-inputs-row .separator {
  color: var(--text-secondary);
  font-size: 13px;
}

/* Progress bar */
.multi-frame-progress {
  margin-top: 16px;
}

.multi-frame-progress .progress-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.multi-frame-progress .progress-bar-track {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.multi-frame-progress .progress-bar-fill {
  height: 100%;
  background: #4a9eff;
  border-radius: 4px;
  transition: width 0.15s ease;
}

/* SLP Export Modal */
.slp-export-modal {
  min-width: 680px;
}

/* Multi-session (two-panel) SLP export layout */
.slp-export-multi {
  min-width: 820px;
}

.slp-export-multi-body {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.slp-export-multi-left {
  flex: 0 0 260px;
  min-width: 0;
}

.slp-export-multi-right {
  flex: 1 1 auto;
  min-width: 0;
}

.slp-export-panel-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.slp-session-row {
  cursor: pointer;
}

.slp-session-row:hover {
  background: var(--accent-dim);
}

.slp-session-row.slp-session-active {
  background: rgba(100, 150, 255, 0.18);
  outline: 2px solid rgba(100, 150, 255, 0.55);
}

.slp-session-selcam {
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Restore right-align override for cam-view stats columns */
.slp-cam-table th:nth-child(n+2),
.slp-cam-table td:nth-child(n+2) {
  text-align: right;
  width: 80px;
  font-variant-numeric: tabular-nums;
}

.slp-export-table-container {
  max-height: 250px;
  overflow-y: auto;
  margin-bottom: 10px;
}

.slp-export-table {
  width: 100%;
}

.slp-export-table th:nth-child(n+3),
.slp-export-table td:nth-child(n+3) {
  text-align: right;
  width: 80px;
  font-variant-numeric: tabular-nums;
}

.slp-export-row {
  cursor: pointer;
}

.slp-export-row:hover {
  background: var(--accent-dim);
}

.slp-export-row.slp-export-selected {
  background: rgba(250, 204, 21, 0.25);
  outline: 2px solid rgba(250, 204, 21, 0.7);
}

.slp-export-row.slp-has-edits {
  background: rgba(76, 175, 80, 0.12);
}

.slp-export-row.slp-has-edits.slp-export-selected {
  background: rgba(250, 204, 21, 0.25);
  outline: 2px solid rgba(250, 204, 21, 0.7);
}

.slp-export-options {
  margin: 8px 0;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Stacked variant: each option on its own row (e.g. By-Cam modal — Save
   Reprojections sits beneath Save PredictedInstances). */
.slp-export-options.slp-export-options-stacked {
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.slp-export-options-stacked .slp-opt-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Disabled option row (e.g. no reprojections available to save). */
.slp-export-options-stacked .slp-opt-disabled {
  opacity: 0.5;
}

.slp-export-options-stacked .slp-opt-disabled label {
  cursor: not-allowed;
}

.slp-reproj-toggle {
  display: inline-flex;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  font-size: 12px;
}

.slp-toggle-option {
  padding: 3px 10px;
  cursor: pointer;
  color: var(--text-secondary);
  user-select: none;
  transition: background 0.15s, color 0.15s;
}

.slp-toggle-option:hover {
  background: var(--accent-dim);
}

.slp-toggle-option.slp-toggle-active {
  background: rgba(234, 179, 8, 0.3);
  color: #eab308;
  font-weight: 600;
}

.slp-reproj-toggle.slp-toggle-disabled .slp-toggle-option {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}

.slp-export-filename-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
  font-size: 13px;
}

.slp-export-filename-row input {
  flex: 1;
  padding: 4px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 13px;
}

.slp-export-note {
  margin: 8px 0;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: 4px;
}

.slp-export-error {
  min-height: 18px;
  margin: 4px 0 6px;
  font-size: 12px;
  color: #ef4444;
}

.slp-export-error:empty {
  display: none;
}

.slp-export-note code {
  font-size: 11px;
  color: var(--text-primary);
}

/* Export All Views modal */
.slp-export-all-modal {
  min-width: 700px;
}

/* Quick post-export result popup (Download Successful / Failed). Sits above the
   export modals (z 20000) so it shows on top / after they close. */
.export-result-overlay {
  position: fixed;
  inset: 0;
  z-index: 30000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
}

.export-result-card {
  min-width: 240px;
  max-width: 70vw;
  padding: 20px 28px;
  border-radius: 10px;
  background: var(--bg-secondary, #1e1e1e);
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.export-result-icon {
  width: 44px;
  height: 44px;
  line-height: 44px;
  border-radius: 50%;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
}

.export-result-card.success .export-result-icon { background: #22c55e; }
.export-result-card.failure .export-result-icon { background: #ef4444; }

.export-result-msg {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
}

/* Export SLEAP File Per Session: active session → one file per camera dir. */
.slp-export-persession-modal {
  min-width: 720px;
}

.slp-export-persession-modal .slp-export-table {
  table-layout: auto;
  width: 100%;
}

/* Download + Camera + Directory columns shrink to fit so the Output Filename
   column (last) absorbs the remaining width and the input reads its full name. */
.slp-export-persession-modal .slp-export-table th:nth-child(1),
.slp-export-persession-modal .slp-export-table td:nth-child(1),
.slp-export-persession-modal .slp-export-table th:nth-child(2),
.slp-export-persession-modal .slp-export-table td:nth-child(2),
.slp-export-persession-modal .slp-export-table th:nth-child(3),
.slp-export-persession-modal .slp-export-table td:nth-child(3) {
  width: 1%;
  white-space: nowrap;
  padding-right: 16px;
}

.slp-export-persession-modal .slp-export-table th:last-child,
.slp-export-persession-modal .slp-export-table td:last-child {
  width: auto;
}

/* Download checkbox column — compact and centered. */
.slp-export-persession-modal .slp-ps-dl-cell {
  text-align: center;
  padding-right: 12px;
}

.slp-export-persession-modal .slp-ps-dl {
  cursor: pointer;
  margin: 0;
}

.slp-export-persession-modal .slp-ps-dir {
  color: var(--text-muted);
  font-family: var(--mono, monospace);
  font-size: 12px;
  white-space: nowrap;
}

.slp-export-persession-modal .slp-ps-filename {
  width: 100%;
  min-width: 340px;
  box-sizing: border-box;
}

.slp-export-all-modal .slp-export-table {
  table-layout: auto;
}

/* Camera column: shrink to fit content, with right padding */
.slp-export-all-modal .slp-export-table th:first-child,
.slp-export-all-modal .slp-export-table td:first-child {
  width: 1%;
  white-space: nowrap;
  padding-right: 20px;
}

/* Reprojections column: explicit min-width so toggle is never clipped */
.slp-export-all-modal .slp-export-table th:last-child,
.slp-export-all-modal .slp-export-table td:last-child {
  min-width: 180px;
  white-space: nowrap;
  text-align: center;
}

.slp-all-row {
  opacity: 0.45;
}

.slp-all-row.slp-all-selected {
  opacity: 1;
  background: rgba(250, 204, 21, 0.15);
}

.slp-all-row.slp-all-selected:hover {
  background: rgba(250, 204, 21, 0.22);
}

.slp-all-filename {
  width: 100%;
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 12px;
  box-sizing: border-box;
}

.slp-all-reproj .slp-toggle-option {
  padding: 2px 6px;
  font-size: 11px;
}

/* Export SLEAP by Camera modal — fixed width so many cameras scroll the camera
   table horizontally rather than stretching the modal across the screen. */
.slp-bycam-modal {
  width: min(1040px, 92vw);
  min-width: 520px;
  max-width: 92vw;
}

/* Two separate, independently-scrollable tables (session names | camera grid)
   with a small gap. Row heights are pinned so the two stay row-aligned. */
.slp-bycam-body {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 8px 0;
}

/* Each table gets its own scroll container. overflow-x:scroll keeps a bottom
   scrollbar always present (mouse users) and scrolls on a trackpad; the
   horizontal extent of each is driven by its own content width. */
.slp-bycam-scroll {
  max-height: 360px;
  overflow-x: scroll;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  scrollbar-width: thin; /* Firefox */
}

/* Definite width (not auto) so the session table can exceed it and scroll
   horizontally for long names — auto + overflow:scroll collapses to min-content
   and clips instead. */
.slp-bycam-sess-scroll {
  flex: 0 0 200px;
  width: 200px;
  max-width: 200px;
}

.slp-bycam-cam-scroll {
  flex: 1 1 auto;
  min-width: 0;
}

/* Always-visible, themed scrollbars (esp. the horizontal one). */
.slp-bycam-scroll::-webkit-scrollbar {
  height: 12px;
  width: 10px;
}
.slp-bycam-scroll::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 6px;
}
.slp-bycam-scroll::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 6px;
}
.slp-bycam-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Scoped under .slp-bycam-scroll to outrank the generic `.data-table`
   (width:100%; border-collapse:collapse) defined later in this file.
   width:max-content lets each table grow to its content and scroll; a
   percentage min-width here would clamp max-content, so the camera table's
   "fill when narrow" is handled separately below. */
.slp-bycam-scroll > .slp-bycam-table {
  border-collapse: separate;
  border-spacing: 0;
  width: auto;
  font-size: 12px;
}
.slp-bycam-cam-scroll > .slp-bycam-cam-table {
  min-width: 100%; /* fill the container when there are few cameras */
}

.slp-bycam-table th,
.slp-bycam-table td {
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  padding: 2px 6px;
  box-sizing: border-box;
}

/* Pinned row heights so the two tables line up row-for-row across the gap. */
.slp-bycam-table thead th { height: 28px; }
.slp-bycam-table tbody td { height: 26px; }
.slp-bycam-table tfoot td { height: 34px; }

/* Compact, fixed-width camera columns (header / cells / ✗ / Download). */
.slp-bycam-cam-head,
.slp-bycam-cell,
.slp-bycam-missing,
.slp-bycam-incl-cell {
  width: 92px;
  min-width: 92px;
  max-width: 92px;
}

/* Sticky header row (camera names / "Session" label). */
.slp-bycam-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--bg-secondary);
  text-align: center;
  white-space: nowrap;
}

/* Sticky footer row (Download buttons / spacer). */
.slp-bycam-table tfoot td {
  position: sticky;
  bottom: 0;
  z-index: 2;
  background: var(--bg-secondary);
  text-align: center;
}

/* Session panel: a div-list (not a table). width:max-content on the inner
   wrapper grows it to the longest name so the container scrolls horizontally;
   min-width:100% fills the container for short names. */
.slp-bycam-sess-inner {
  width: max-content;
  min-width: 100%;
}
.slp-bycam-sess-cell-d {
  display: flex;
  align-items: center;
  white-space: nowrap;
  padding: 0 8px;
  border-bottom: 1px solid var(--border-color);
  box-sizing: border-box;
  background: var(--bg-secondary);
}
.slp-bycam-sess-h-row {
  position: sticky;
  top: 0;
  z-index: 2;
  height: 28px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}
.slp-bycam-sess-row {
  height: 26px;
  font-variant-numeric: tabular-nums;
}
.slp-bycam-sess-foot-row {
  position: sticky;
  bottom: 0;
  z-index: 2;
  height: 34px;
  border-bottom: none;
}

/* Long camera names scroll horizontally inside the header cell. */
.slp-bycam-cam-name {
  max-width: 80px;
  overflow-x: auto;
  white-space: nowrap;
  font-weight: 600;
}

/* Toggle-able presence cell. */
.slp-bycam-cell {
  text-align: center;
  cursor: pointer;
  user-select: none;
  font-weight: 700;
}

.slp-bycam-cell.on {
  background: rgba(250, 204, 21, 0.25);
  color: #eab308;
}

.slp-bycam-cell.off {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  opacity: 0.55;
}

.slp-bycam-cell:hover {
  outline: 1px solid rgba(250, 204, 21, 0.6);
  outline-offset: -1px;
}

/* Session lacks this camera view — red ✗, not selectable. */
.slp-bycam-missing {
  text-align: center;
  color: #ef4444;
  font-weight: 700;
  cursor: not-allowed;
  user-select: none;
}

.slp-bycam-incl-cell {
  text-align: center;
  padding: 2px 3px;
}

/* Per-column include toggle for "Download All". Mirrors the presence-cell
   ✓/✗ look so the footer reads as one more selectable row. */
.slp-bycam-incl {
  display: inline-block;
  min-width: 22px;
  text-align: center;
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  border-radius: 4px;
  padding: 1px 4px;
}

.slp-bycam-incl.on {
  background: rgba(250, 204, 21, 0.25);
  color: #eab308;
}

.slp-bycam-incl.off {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  opacity: 0.7;
}

.slp-bycam-incl:not(.disabled):hover {
  outline: 1px solid rgba(250, 204, 21, 0.6);
  outline-offset: -1px;
}

/* Blocked (skeleton mismatch) or permanently-empty column — red ✗, not selectable. */
.slp-bycam-incl.disabled {
  background: none;
  color: #ef4444;
  opacity: 0.85;
  cursor: not-allowed;
}

/* Full-width Download All row beneath the table. */
.slp-bycam-all-row {
  display: flex;
  justify-content: flex-end;
  margin: 10px 0 0;
}

.slp-bycam-modal .slp-bycam-all-btn {
  padding: 7px 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.slp-bycam-modal .slp-bycam-all-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Red warning shown under the tables when a column's download is blocked
   because the selected sessions have mismatched skeletons. */
.slp-bycam-skel-warning {
  margin: 6px 0 0;
  padding: 6px 8px;
  font-size: 12px;
  color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: 4px;
  white-space: pre-line;
}


/* Modal layout: range row with views list */
.modal-range-row {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.modal-range-row .frame-inputs-row {
  margin: 0;
}

.modal-views-section {
  min-width: 100px;
}

.modal-views-section label {
  font-size: 12px;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 4px;
}

.modal-view-list {
  margin: 0;
  padding-left: 16px;
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.6;
}

/* Error message in modal */
.multi-frame-error {
  margin-top: 12px;
  padding: 8px 12px;
  background: rgba(220, 53, 69, 0.12);
  border: 1px solid rgba(220, 53, 69, 0.3);
  border-radius: 4px;
  color: #f87171;
  font-size: 12px;
  line-height: 1.5;
}

.toolbar-separator {
  width: 1px;
  height: 20px;
  background: var(--border-color);
  margin: 0 4px;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Timeline
   -------------------------------------------------------------------------- */

.timeline-container {
  height: var(--timeline-height);
  min-height: 40px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  position: relative;
  /* Block 1 (Prompt 4): vertical overflow now lives on the inner
     `.timeline-track-area` wrapper — the container itself is a flex
     column so the wrapper can absorb the remaining vertical space. */
  overflow: hidden;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.timeline-track-area {
  flex: 1 1 auto;
  min-height: 0;
  /* Scrollbar appears only when the timeline is shortened enough that the
     track rows overflow vertically. `scrollbar-gutter: stable` keeps the
     canvas width steady when the bar appears/disappears so the playhead
     doesn't jitter on resize. Combined with the explicit `::-webkit-scrollbar`
     rules below (and `-webkit-appearance: none`), this defeats macOS's
     overlay-scrollbar behavior so the bar is always *visible* while it
     exists rather than fading on idle. */
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
  scrollbar-gutter: stable;
  /* Firefox: classic visible scrollbar at the platform's normal width. */
  scrollbar-width: auto;
  scrollbar-color: var(--text-muted) var(--bg-tertiary);
}

/* Wider, always-visible vertical scrollbar on the timeline's track area.
   Overrides the body-level 6px `::-webkit-scrollbar` rule so this scrollbar
   reads as a deliberate UI element, and uses `-webkit-appearance: none` to
   defeat macOS's overlay-scrollbar behavior. */
.timeline-track-area::-webkit-scrollbar {
  width: 12px;
  -webkit-appearance: none;
}

.timeline-track-area::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-left: 1px solid var(--border-color);
}

.timeline-track-area::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 6px;
  border: 2px solid var(--bg-tertiary);
  min-height: 24px;
}

.timeline-track-area::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

.timeline-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.timeline-container.collapsed {
  /* Fully hide the timeline — `height: 0` alone is not enough because
     `.timeline-container` declares `min-height: 40px`, which would leave a
     ~two-row strip visible. Override `min-height` and force `height: 0`
     with !important so any inline-style height set by toggleTimeline /
     fitTimelineToData is also defeated. The 8px `.split-handle.horizontal`
     above the container remains visible and provides the click-and-drag
     affordance the user can use to expand the timeline back up. */
  height: 0 !important;
  min-height: 0 !important;
  border-top: none;
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   Controls Bar (Playback)
   -------------------------------------------------------------------------- */

.controls-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  height: var(--controls-bar-height);
  padding: 0 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
  user-select: none;
}

/* Frame counter display */
.frame-display {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  min-width: 90px;
}

.frame-display .current-frame {
  color: var(--text-primary);
  font-weight: 600;
  cursor: default;
  padding: 0 2px;
  border-radius: 3px;
  transition: background var(--transition-fast);
}

.frame-display .current-frame:hover {
  background: var(--bg-tertiary);
}

/* Transport controls */
.transport-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.transport-controls button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  background: var(--bg-button);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.transport-controls button:hover {
  background: var(--bg-button-hover);
  border-color: var(--border-light);
}

.transport-controls button:active {
  background: var(--accent);
  border-color: var(--accent);
}

.transport-controls button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.transport-controls button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* Seekbar */
.seekbar-container {
  flex: 1;
  position: relative;
  height: 24px;
  display: flex;
  align-items: center;
  cursor: pointer;
  min-width: 120px;
}

.seekbar-track {
  position: absolute;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--bg-button);
  border-radius: 3px;
  overflow: hidden;
}

.seekbar-progress {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  width: 0%;
  transition: width 50ms linear;
}

.seekbar-thumb {
  position: absolute;
  width: 14px;
  height: 14px;
  background: #ffffff;
  border: 2px solid var(--accent);
  border-radius: 50%;
  top: 50%;
  left: 0%;
  transform: translate(-50%, -50%);
  z-index: 2;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.seekbar-container:hover .seekbar-thumb {
  transform: translate(-50%, -50%) scale(1.2);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.6);
}

.seekbar-container:hover .seekbar-track {
  height: 8px;
}

/* FPS pill */
.fps-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: default;
  user-select: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.fps-pill:hover {
  border-color: var(--border-light);
  background: var(--bg-button);
}

/* FPS display */
.fps-display {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 40px;
  text-align: center;
}

/* --------------------------------------------------------------------------
   Info Panel (Right Sidebar)
   -------------------------------------------------------------------------- */

.info-panel {
  width: var(--info-panel-width);
  min-width: var(--info-panel-width);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
  flex: 1;
  transition: width var(--transition-normal), min-width var(--transition-normal),
    opacity var(--transition-normal);
}

/* Info sections */
.info-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
}

.info-section h3 {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* Session info */
.session-info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 0;
  font-size: 13px;
}

.session-info-row .label {
  color: var(--text-secondary);
}

.session-info-row .value {
  color: var(--text-primary);
  font-weight: 500;
}

/* Instance / Track list */
.instance-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  list-style: none;
}

.instance-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-tertiary);
  border-radius: 5px;
  font-size: 13px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.instance-item:hover {
  background: var(--bg-button);
}

.instance-item.selected {
  background: var(--accent-dim);
  outline: 1px solid var(--accent);
}

/* ---- Panel Tabs ---- */
.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.panel-tab {
  /* Size to the tab's full name — never squished/truncated. Overflow tabs
     are demoted into the "More" dropdown by layoutPanelTabs() instead. */
  flex: 0 0 auto;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.panel-tab:hover {
  color: var(--text-secondary);
}

.panel-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---- "More ▾" overflow dropdown for panel tabs ---- */
.panel-tab-more {
  position: relative;
  margin-left: auto; /* anchor to the right edge of the tab bar */
  flex: 0 0 auto;
}

.panel-tab-more-btn {
  display: flex;
  align-items: center;
  gap: 4px;
}

.panel-tab-more-btn .more-caret {
  font-size: 9px;
  line-height: 1;
}

.panel-tab-more-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 100;
  min-width: 130px;
  padding: 4px 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.45);
}

.panel-tab-more.open .panel-tab-more-menu {
  display: block;
}

.panel-tab-more-item {
  display: block;
  width: 100%;
  padding: 7px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  background: none;
  border: none;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.panel-tab-more-item:hover {
  color: var(--text-secondary);
  background: var(--bg-tertiary);
}

.panel-tab-more-item.active {
  color: var(--accent);
}

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

.panel-tab-content.active {
  display: block;
}

/* ---- Data Tables ---- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.data-table thead th {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  padding: 4px 6px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
}

.data-table tbody tr {
  cursor: pointer;
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--bg-button);
}

.data-table tbody tr.selected {
  background: var(--accent-dim);
}

.data-table tbody td {
  padding: 5px 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 120px;
}

.data-table .mono {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 11px;
}

.data-table .badge {
  display: inline-block;
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 3px;
  font-weight: 600;
}

.data-table .badge-predicted {
  background: rgba(168, 85, 247, 0.4);
  color: #d8b4fe;
}

.data-table .badge-user {
  background: rgba(6, 182, 212, 0.4);
  color: #67e8f9;
}

.data-table .badge-reproj {
  background: rgba(251, 146, 60, 0.4);
  color: #fdba74;
}

.table-empty {
  padding: 10px 6px;
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
}

.panel-button-row {
  display: flex;
  gap: 6px;
}

.panel-btn {
  flex: 1;
  padding: 4px 8px;
  font-size: 12px;
  background: var(--surface-lighter);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  cursor: pointer;
}

.panel-btn:hover:not(:disabled) {
  background: var(--surface-hover);
}

.panel-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.track-indicator {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.instance-item .instance-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.instance-item .instance-score {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 11px;
  color: var(--text-muted);
}

/* Triangulation method label (under "Reprojection Error") */
.error-method {
  text-align: center;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Reprojection error display */
.error-display-undist {
  text-align: center;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: -8px;
  padding-bottom: 10px;
}

.error-display-undist:empty {
  display: none;
}

.error-display {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  padding: 12px 0;
  color: var(--text-primary);
}

.error-display.low {
  color: var(--success-color);
}

.error-display.medium {
  color: var(--warning-color);
}

.error-display.high {
  color: var(--error-color);
}

.error-display .error-unit {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

/* Control group (labels + inputs in the panel) */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}

.control-group label span {
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   Toggle Switch
   -------------------------------------------------------------------------- */

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-switch .slider {
  position: absolute;
  inset: 0;
  background: var(--bg-button);
  border-radius: 22px;
  cursor: pointer;
  transition: background var(--transition-normal);
}

.toggle-switch .slider::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  bottom: 3px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: transform var(--transition-normal), background var(--transition-normal);
}

.toggle-switch input:checked + .slider {
  background: var(--accent);
}

.toggle-switch input:checked + .slider::before {
  transform: translateX(18px);
  background: #ffffff;
}

.toggle-switch input:focus-visible + .slider {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Range Slider (node size, etc.)
   -------------------------------------------------------------------------- */

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-button);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: 2px solid #ffffff;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: 2px solid #ffffff;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

input[type="range"]::-moz-range-track {
  height: 6px;
  background: var(--bg-button);
  border-radius: 3px;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-button);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover {
  background: var(--bg-button-hover);
  border-color: var(--border-light);
}

.btn:active {
  background: var(--accent);
  border-color: var(--accent);
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-primary:active {
  background: #5568d4;
  border-color: #5568d4;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 4px;
}

/* --------------------------------------------------------------------------
   Status Bar
   -------------------------------------------------------------------------- */

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--status-bar-height);
  padding: 0 12px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
  user-select: none;
}

.status-bar .status-left,
.status-bar .status-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-bar .status-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.status-bar .status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success-color);
}

.status-bar .status-dot.warning {
  background: var(--warning-color);
}

.status-bar .status-dot.error {
  background: var(--error-color);
}

/* --------------------------------------------------------------------------
   Instance Actions
   -------------------------------------------------------------------------- */

.instance-actions {
  display: flex;
  gap: 4px;
  padding: 8px 0 0;
}

.instance-actions .btn {
  flex: 1;
  font-size: 12px;
  padding: 4px 8px;
}

/* --------------------------------------------------------------------------
   Overlay Canvas Cursor States
   -------------------------------------------------------------------------- */

.overlay-canvas {
  cursor: default;
}

.overlay-canvas.cursor-pointer {
  cursor: pointer;
}

.overlay-canvas.cursor-grab {
  cursor: grab;
}

.overlay-canvas.cursor-grabbing {
  cursor: grabbing;
}

.overlay-canvas.cursor-crosshair {
  cursor: crosshair;
}

/* --------------------------------------------------------------------------
   Context Menu
   -------------------------------------------------------------------------- */

.context-menu {
  position: fixed;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  min-width: 180px;
  z-index: 200;
  padding: 4px 0;
}

.context-menu-item {
  padding: 6px 16px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.context-menu-item:hover {
  background: var(--accent-dim);
}

.context-menu-item.danger {
  color: var(--error-color);
}

.context-menu-item.danger:hover {
  background: rgba(231, 76, 60, 0.1);
}

/* --------------------------------------------------------------------------
   Triangulation Status Badge
   -------------------------------------------------------------------------- */

.triangulation-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}

.triangulation-badge.needs-triangulation {
  background: rgba(255, 204, 0, 0.15);
  color: var(--warning-color);
  border: 1px solid rgba(255, 204, 0, 0.3);
}

.triangulation-badge.triangulated {
  background: rgba(76, 175, 80, 0.15);
  color: var(--success-color);
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.triangulation-badge.error {
  background: rgba(244, 67, 54, 0.15);
  color: var(--error-color);
  border: 1px solid rgba(244, 67, 54, 0.3);
}

/* --------------------------------------------------------------------------
   Keyboard Shortcut Hints
   -------------------------------------------------------------------------- */

.shortcut-hint {
  font-size: 11px;
  color: var(--text-muted);
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  background: var(--bg-tertiary);
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

/* --------------------------------------------------------------------------
   Split Pane Handle
   -------------------------------------------------------------------------- */

.split-handle {
  background: var(--border-color);
  flex-shrink: 0;
  transition: background 0.15s;
  position: relative;
  z-index: 5;
}

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

.split-handle.vertical {
  width: 5px;
  cursor: col-resize;
}

.split-handle.horizontal {
  height: 8px;
  cursor: row-resize;
}

/* Hide split handles when adjacent panel is collapsed */
.split-handle.hidden {
  display: none;
}

/* Auto-assignment toast — centered in menu bar with highlight */
.auto-assign-toast {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 16px;
  font-size: 12px;
  color: var(--text-primary);
  white-space: nowrap;
  background: rgba(102, 126, 234, 0.12);
  border: 1px solid rgba(102, 126, 234, 0.3);
  border-radius: 6px;
}

.auto-assign-toast button {
  padding: 4px 14px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-button);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 12px;
}

.auto-assign-toast button:hover {
  background: var(--bg-button-hover);
}

.auto-assign-toast button.primary {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}

/* Red highlight for auto-assignment view selection */
.video-cell.auto-assign-selected:not(.zoomed) .canvas-wrapper {
  outline: 3px solid #ef4444;
  outline-offset: -3px;
}

/* When zoomed: red highlight via pseudo-element overlay */
.video-cell.auto-assign-selected.zoomed::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid #ef4444;
  pointer-events: none;
  z-index: 18;
}

/* Ghost line shown during split handle drag */
.split-ghost-line {
  position: fixed;
  width: 3px;
  background: var(--accent);
  z-index: 9999;
  pointer-events: none;
  box-shadow: 0 0 8px rgba(102, 126, 234, 0.6);
}

/* --------------------------------------------------------------------------
   Info Panel Wrapper & Toggle Button
   -------------------------------------------------------------------------- */

.info-panel-wrapper {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  border-left: 1px solid var(--border-color);
}

.info-panel-wrapper.collapsed {
  border-left: none;
}

.info-panel-wrapper.collapsed .info-panel {
  width: 0;
  min-width: 0;
  opacity: 0;
  overflow: hidden;
  border-left: none;
}

/* --------------------------------------------------------------------------
   Loading Overlay
   -------------------------------------------------------------------------- */

.loading-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(26, 26, 26, 0.88);
  z-index: 1000;
  color: var(--text-secondary);
  font-size: 14px;
}

.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;
}

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

/* --------------------------------------------------------------------------
   Keyboard Key
   -------------------------------------------------------------------------- */

kbd {
  display: inline-block;
  padding: 1px 5px;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 10px;
  background: var(--bg-button);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  min-width: 20px;
  text-align: center;
}

/* --------------------------------------------------------------------------
   Utility: Hidden
   -------------------------------------------------------------------------- */

.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Responsive: Collapse Info Panel on Narrow Screens
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {
  .info-panel-wrapper {
    position: absolute;
    right: 0;
    top: 0;
    bottom: calc(var(--controls-bar-height) + var(--status-bar-height));
    z-index: 50;
    box-shadow: -4px 0 16px rgba(0, 0, 0, 0.5);
  }

  .info-panel-wrapper.collapsed {
    box-shadow: none;
  }
}

@media (max-width: 640px) {
  .info-panel {
    width: 100%;
    min-width: 100%;
  }

  .view-strip {
    width: 48px;
    min-width: 48px;
  }

  .view-strip-item .strip-thumb {
    width: 36px;
    height: 27px;
  }

  .controls-bar {
    gap: 8px;
    padding: 0 8px;
  }

  .frame-display {
    font-size: 11px;
    min-width: 70px;
  }

  .transport-controls button {
    width: 30px;
    height: 30px;
    font-size: 12px;
  }
}

/* Visibility tab */
#tabVisibility {
    padding: 8px 10px;
}
.vis-section-header {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-primary);
    padding: 6px 0 4px;
    margin-top: 10px;
    margin-bottom: 6px;
    border-top: 1px solid var(--border-color);
}
.vis-section-header:first-of-type {
    border-top: none;
    margin-top: 0;
}

/* Toolbar checkboxes */
.toolbar-checkboxes {
    font-size: 11px;
    gap: 8px;
    color: var(--text-secondary);
    align-items: center;
}
.toolbar-checkboxes label {
    display: flex;
    align-items: center;
    gap: 3px;
    cursor: pointer;
}
.vis-slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}
/* Block 2 (Prompt 4): per-session timeline visibility toggle lists. */
.vis-timeline-toggles {
    font-size: 11px;
}
.vis-toggle-list {
    max-height: 160px;
    overflow-y: auto;
    border: 1px solid var(--border-subtle, #2a2a2a);
    border-radius: 3px;
    padding: 2px;
    margin-bottom: 4px;
}
.vis-toggle-row:hover {
    background: rgba(255,255,255,0.04);
}
/* Views list specifically: cameras are a small, finite count — drop the
   scroll-clamped container and render as clean tabular rows with subtle
   separators. Tracks and Identities keep .vis-toggle-list (scrollable). */
#visTimelineCameras {
    max-height: none;
    overflow: visible;
    border: none;
    padding: 0;
}
#visTimelineCameras .vis-toggle-row {
    padding: 4px 6px;
    border-bottom: 1px solid var(--border-subtle, #2a2a2a);
}
#visTimelineCameras .vis-toggle-row:last-child {
    border-bottom: none;
}
/* Compact toggle-switch for the timeline visibility rows — the standard
   40×22 size dominates the narrow Info Panel rows when many cameras /
   tracks / identities are listed. */
.vis-toggle-row .toggle-switch {
    width: 28px;
    height: 16px;
}
.vis-toggle-row .toggle-switch .slider::before {
    width: 12px;
    height: 12px;
    left: 2px;
    bottom: 2px;
}
.vis-toggle-row .toggle-switch input:checked + .slider::before {
    transform: translateX(12px);
}
.vis-slider-row span:first-child {
    flex: 0 0 100px;
}
.vis-slider-row input[type="range"] {
    flex: 1;
}
.vis-val {
    flex: 0 0 28px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}
.vis-line-style-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}
.vis-line-style-row span:first-child {
    flex: 0 0 100px;
}
.line-style-options {
    display: flex;
    gap: 4px;
}
.line-style-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    padding: 2px 4px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}
.line-style-btn:hover {
    border-color: var(--text-secondary);
}
.line-style-btn.active {
    border-color: var(--accent);
    background: var(--accent-dim);
    color: var(--text-primary);
}

/* --- Tracker UI --- */
.tracker-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 32px;
    background: #1a1a2e;
    display: flex;
    align-items: center;
    padding: 0 12px;
    z-index: 9999;
    border-bottom: 1px solid #333;
    gap: 8px;
}
.tracker-progress-inner {
    flex: 1;
    height: 4px;
    background: #333;
    border-radius: 2px;
    overflow: hidden;
}
.tracker-progress-bar {
    height: 100%;
    background: #667eea;
    border-radius: 2px;
    transition: width 0.2s;
}
#trackerProgressText {
    font-size: 12px;
    color: #ccc;
    white-space: nowrap;
}
.tracker-settings {
    background: #16213e;
    border: 1px solid #2a2d5e;
    border-radius: 4px;
    margin: 4px 8px;
    padding: 4px 8px;
    font-size: 12px;
}
.tracker-settings summary {
    cursor: pointer;
    color: #667eea;
    font-weight: 600;
}
.tracker-settings-body label {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 4px 0;
    color: #ccc;
}
.tracker-settings-body input[type="range"] {
    flex: 1;
    max-width: 120px;
}
.tracker-settings-body span {
    min-width: 28px;
    text-align: right;
    color: #888;
    font-size: 11px;
}

/* --- Timeline mode toggle --- */
.timeline-mode-toggle {
    position: absolute;
    top: 2px;
    right: 6px;
    z-index: 10;
    display: flex;
    gap: 2px;
}
.timeline-mode-btn {
    font-size: 10px;
    padding: 1px 6px;
    border: 1px solid #444;
    background: #1a1a2e;
    color: #888;
    border-radius: 3px;
    cursor: pointer;
    line-height: 1.4;
}
.timeline-mode-btn:hover {
    background: #2a2d5e;
    color: #ccc;
}
.timeline-mode-btn.active {
    background: #667eea;
    color: #fff;
    border-color: #667eea;
}

/* Hide number input spinner buttons */
.no-spinner::-webkit-outer-spin-button,
.no-spinner::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Custom stepper arrows for 3D viewer inputs */
.vis3d-stepper {
    display: inline-flex;
    flex-direction: column;
    vertical-align: middle;
    margin-left: 2px;
}
.vis3d-stepper button {
    display: block;
    width: 14px;
    height: 10px;
    padding: 0;
    border: 1px solid var(--border-color, #444);
    background: var(--bg-tertiary, #2a2a2a);
    color: var(--text-secondary, #aaa);
    font-size: 7px;
    line-height: 8px;
    text-align: center;
    cursor: pointer;
}
.vis3d-stepper button:first-child {
    border-radius: 2px 2px 0 0;
    border-bottom: none;
}
.vis3d-stepper button:last-child {
    border-radius: 0 0 2px 2px;
}
.vis3d-stepper button:hover {
    background: var(--bg-button-hover, #3a3a3a);
    color: var(--text-primary, #e0e0e0);
}

/* Speed popover */
.speed-popover {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: 6px;
    background: var(--bg-secondary, #1e1e1e);
    border: 1px solid var(--border-color, #444);
    border-radius: 8px;
    padding: 12px 14px;
    min-width: 240px;
    z-index: 9000;
    box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}
.speed-popover .speed-label {
    text-align: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary, #e0e0e0);
    margin-bottom: 8px;
}
.speed-popover .speed-slider-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 10px;
}
.speed-popover .speed-slider-row input[type=range] {
    flex: 1;
}
.speed-popover .speed-slider-row button {
    width: 24px;
    height: 24px;
    border: 1px solid var(--border-color, #444);
    background: var(--bg-tertiary, #2a2a2a);
    color: var(--text-primary, #e0e0e0);
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    padding: 0;
}
.speed-popover .speed-presets {
    display: flex;
    gap: 4px;
    justify-content: center;
}
.speed-popover .speed-presets button {
    padding: 4px 10px;
    font-size: 11px;
    border: 1px solid var(--border-color, #444);
    background: var(--bg-tertiary, #2a2a2a);
    color: var(--text-primary, #e0e0e0);
    border-radius: 4px;
    cursor: pointer;
}
.speed-popover .speed-presets button.active {
    border-color: var(--accent, #4a9eff);
    background: rgba(74,158,255,0.15);
}

/* ===== Settings modal ===== */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 20000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.settings-modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  width: 880px;
  max-width: 94vw;
  height: 620px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.settings-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.settings-modal-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.settings-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-fast);
}

.settings-modal-close:hover {
  color: var(--text-primary);
}

.settings-modal-body {
  display: flex;
  flex: 1;
  min-height: 0;
}

.settings-nav {
  width: 180px;
  flex-shrink: 0;
  border-right: 1px solid var(--border-color);
  padding: 8px 0;
  overflow-y: auto;
  background: var(--bg-tertiary);
}

.settings-nav-item {
  padding: 9px 18px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.settings-nav-item:hover {
  background: var(--bg-button);
  color: var(--text-primary);
}

.settings-nav-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}

.settings-panel-container {
  flex: 1;
  padding: 20px 24px;
  overflow-y: auto;
}

.settings-panel {
  display: none;
}

.settings-panel.active {
  display: block;
}

.settings-panel-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.settings-radio-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: background var(--transition-fast),
    border-color var(--transition-fast);
}

.settings-radio-row:hover {
  background: var(--bg-button);
}

.settings-radio {
  width: 16px;
  height: 16px;
  border: 2px solid var(--text-muted);
  border-radius: 4px;
  flex-shrink: 0;
  position: relative;
  transition: border-color var(--transition-fast),
    background var(--transition-fast);
}

.settings-radio-row.checked .settings-radio {
  border-color: var(--accent);
  background: var(--accent);
}

.settings-radio-row.checked .settings-radio::after {
  content: '\2713';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 11px;
  line-height: 1;
}

.settings-radio-row.checked {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.settings-radio-label {
  display: flex;
  flex-direction: column;
}

.settings-radio-title {
  font-size: 13px;
  color: var(--text-primary);
}

.settings-radio-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.settings-kbd-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px;
  border-bottom: 1px solid var(--border-color);
}

.settings-kbd-label {
  font-size: 13px;
  color: var(--text-primary);
}

.settings-kbd-key {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  min-width: 44px;
  text-align: center;
  padding: 4px 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-button);
  color: var(--text-primary);
  font-size: 12px;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.settings-kbd-key:hover {
  border-color: var(--accent);
}

.settings-kbd-key.capturing {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* Fixed (non-rebindable) reference shortcuts: shown but not interactive. */
.settings-kbd-key.fixed {
  cursor: default;
  color: var(--text-muted);
  background: transparent;
  border-style: dashed;
}

.settings-kbd-key.fixed:hover {
  border-color: var(--border-color);
}

/* Category subheader within the Keyboard Shortcuts list. */
.settings-kbd-category {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent);
  margin: 16px 0 4px;
  padding-bottom: 2px;
}

.settings-kbd-category:first-child {
  margin-top: 0;
}

.settings-kbd-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 12px;
}

/* Tracking Wizard ▸ Node Weights: a scrollable, multi-column table of nodes so
   long skeletons stay compact. */
.settings-node-weight-list {
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 10px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  column-gap: 24px;
}

.settings-node-weight-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 4px;
  border-bottom: 1px solid var(--border-color);
  min-width: 0;
}

.settings-node-weight-row .settings-kbd-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Tracking Wizard ▸ Camera Views: a view excluded from tracking (weight 0)
   greys out to signal it won't take part in the association math. */
.settings-node-weight-row.settings-view-excluded .settings-kbd-label {
  color: var(--text-muted, #888);
  opacity: 0.55;
}
.settings-node-weight-row.settings-view-excluded .settings-num-input {
  opacity: 0.55;
}

/* Tracking Wizard ▸ Tracking Thresholds: label + description, value on the right. */
.settings-threshold-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 4px;
  border-bottom: 1px solid var(--border-color);
}

.settings-threshold-label-wrap {
  flex: 1;
  min-width: 0;
}

.settings-threshold-title {
  font-size: 13px;
  color: var(--text-primary);
}

.settings-threshold-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Shared number field for node weights and tracking thresholds. */
.settings-num-input {
  width: 72px;
  flex: 0 0 auto;
  text-align: center;
  padding: 4px 8px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-button);
  color: var(--text-primary);
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.settings-num-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* No up/down spinner arrows on the number fields. */
.settings-num-input::-webkit-outer-spin-button,
.settings-num-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.settings-num-input {
  -moz-appearance: textfield;
  appearance: textfield;
}

.settings-docs-note {
  margin-top: 14px;
}

.settings-docs-note a {
  color: var(--accent);
  text-decoration: none;
}

.settings-docs-note a:hover {
  text-decoration: underline;
}

.settings-coming-soon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 0.5px;
}

.settings-modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 12px 18px;
  border-top: 1px solid var(--border-color);
}

.settings-btn {
  padding: 7px 18px;
  border-radius: 5px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: background var(--transition-fast), color var(--transition-fast),
    opacity var(--transition-fast);
}

.settings-btn-cancel {
  background: var(--bg-button);
  color: var(--text-secondary);
}

.settings-btn-cancel:hover {
  color: var(--text-primary);
}

.settings-btn-apply {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.settings-btn-apply:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}