/* Atomic move tree
 *
 * Page-specific semantics live here; color foundations come from atomicdb.css.
 * The SVG renderer should use the node/link classes documented near the
 * "Rendered tree" section so the interface remains legible in both themes.
 */

.move-tree-main {
  width: 100%;
  max-width: 1600px;
  margin-top: 1rem;
  padding-inline: clamp(.75rem, 2vw, 1.75rem);
}

.move-tree {
  --tree-canvas: #151714;
  --tree-grid: rgba(239, 236, 224, .055);
  --tree-card: var(--surface-1);
  --tree-card-raised: var(--surface-2);
  --tree-card-hover: var(--surface-hover);
  --tree-line: var(--border-strong);
  --tree-line-soft: var(--border);
  --tree-line-active: var(--hot);
  --tree-win: var(--won);
  --tree-loss: var(--lost);
  --tree-draw: var(--draw);
  --tree-unknown: var(--cold);
  --tree-shadow: 0 18px 46px rgba(0, 0, 0, .22);
  --tree-shadow-soft: 0 8px 24px rgba(0, 0, 0, .16);
  --tree-radius: 16px;
  --tree-node-width: 10rem;
  --tree-node-height: 4.5rem;
  display: grid;
  gap: .85rem;
  min-width: 0;
  color: var(--ink);
}

html[data-theme="light"] .move-tree {
  --tree-canvas: #f8f5ee;
  --tree-grid: rgba(43, 37, 29, .065);
  --tree-shadow: 0 18px 46px rgba(75, 62, 43, .13);
  --tree-shadow-soft: 0 8px 24px rgba(75, 62, 43, .1);
}

@media (prefers-color-scheme: light) {
  html:not([data-theme]) .move-tree {
    --tree-canvas: #f8f5ee;
    --tree-grid: rgba(43, 37, 29, .065);
    --tree-shadow: 0 18px 46px rgba(75, 62, 43, .13);
    --tree-shadow-soft: 0 8px 24px rgba(75, 62, 43, .1);
  }
}

.move-tree button,
.move-tree input,
.move-tree a {
  -webkit-tap-highlight-color: transparent;
}

.move-tree button {
  border: 0;
}

.tree-hero {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 5.75rem;
  padding: 0 0 .2rem;
  background: transparent;
  border: 0;
}

.tree-heading {
  min-width: 0;
}

.tree-eyebrow,
.tree-panel-kicker,
.inspector-kicker {
  display: block;
  color: var(--hot);
  font-size: .68rem;
  font-weight: 750;
  letter-spacing: .12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.tree-heading h1 {
  margin-top: .22rem;
  color: var(--ink-strong);
  font-size: clamp(1.75rem, 3vw, 2.55rem);
  font-weight: 720;
  letter-spacing: -.045em;
  line-height: 1;
}

.tree-heading p {
  max-width: 46rem;
  margin-top: .48rem;
  color: var(--ink-muted);
  font-size: .92rem;
  line-height: 1.45;
}

.snapshot-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: .38rem;
}

.snapshot-status {
  display: inline-flex;
  align-items: center;
  gap: .48rem;
  min-height: 2rem;
  padding: .4rem .7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--tree-card);
  color: var(--ink-muted);
  font-size: .75rem;
  font-weight: 600;
  white-space: nowrap;
}

.snapshot-refresh {
  display: inline-flex;
  align-items: center;
  gap: .38rem;
  min-height: 2rem;
  padding: .4rem .65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--tree-card);
  color: var(--ink-muted);
  font-size: .72rem;
  font-weight: 650;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease,
    color 150ms ease;
}

.snapshot-refresh:hover {
  border-color: var(--border-strong);
  background: var(--tree-card-hover);
  color: var(--ink-strong);
}

.snapshot-refresh svg {
  width: .9rem;
  height: .9rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.snapshot-refresh.is-loading svg {
  animation: tree-spin .8s linear infinite;
}

.snapshot-dot,
.live-mark,
.work-state-mark {
  width: .52rem;
  height: .52rem;
  flex: 0 0 auto;
  border: 2px solid var(--canvas);
  border-radius: 50%;
  background: var(--hot);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--hot), transparent 58%);
}

.tree-toolbar {
  display: grid;
  grid-template-columns: minmax(15rem, 1.15fr) minmax(25rem, 1.4fr) auto;
  align-items: center;
  gap: .65rem;
  min-height: 4rem;
  padding: .55rem;
  border: 1px solid var(--border);
  border-radius: var(--tree-radius);
  background: var(--tree-card);
  box-shadow: var(--tree-shadow-soft);
}

.tree-search {
  display: grid;
  grid-template-columns: 1.15rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .55rem;
  min-width: 0;
  height: 2.8rem;
  padding-inline: .82rem .55rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--canvas);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.tree-search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus-ring), transparent 73%);
}

.tree-search svg,
.tree-icon-button svg,
.tree-text-button svg,
.inspector-close svg {
  width: 1.08rem;
  height: 1.08rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.tree-search svg {
  color: var(--ink-muted);
}

.tree-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink-strong);
  font-size: .86rem;
}

.tree-search input::placeholder {
  color: var(--ink-muted);
  opacity: .9;
}

.tree-search kbd,
.help-shortcuts kbd {
  display: inline-grid;
  min-width: 1.5rem;
  height: 1.45rem;
  padding-inline: .32rem;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--tree-card-raised);
  color: var(--ink-muted);
  font: 650 .67rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.branch-modes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .25rem;
  min-width: 0;
  padding: .24rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--canvas);
}

.branch-modes label {
  position: relative;
  min-width: 0;
  cursor: pointer;
}

.branch-modes input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.branch-modes span {
  display: grid;
  min-height: 2.25rem;
  padding: .4rem .68rem;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink-muted);
  font-size: .76rem;
  font-weight: 650;
  line-height: 1.1;
  text-align: center;
  white-space: nowrap;
  transition: background 150ms ease, border-color 150ms ease,
    color 150ms ease;
}

.branch-modes input:hover + span {
  color: var(--ink);
}

.branch-modes input:checked + span {
  border-color: var(--border);
  background: var(--tree-card-raised);
  color: var(--ink-strong);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .12);
}

.branch-modes input:focus-visible + span {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.view-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .32rem;
}

.tree-icon-button,
.tree-text-button,
.inspector-close {
  display: inline-grid;
  flex: 0 0 auto;
  min-width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--canvas);
  color: var(--ink-muted);
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease,
    color 150ms ease, transform 150ms ease;
}

.tree-icon-button:hover,
.tree-text-button:hover,
.inspector-close:hover {
  border-color: var(--border-strong);
  background: var(--tree-card-hover);
  color: var(--ink-strong);
}

.tree-icon-button:active,
.tree-text-button:active,
.inspector-close:active {
  transform: translateY(1px);
}

.tree-text-button {
  display: inline-flex;
  width: auto;
  padding-inline: .72rem;
  gap: .42rem;
  font-size: .75rem;
  font-weight: 650;
  white-space: nowrap;
}

.tree-breadcrumbs {
  display: flex;
  align-items: center;
  gap: .22rem;
  min-height: 2.45rem;
  overflow-x: auto;
  padding: .22rem .2rem;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
}

.tree-breadcrumbs button {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: .4rem;
  min-height: 2rem;
  padding: .32rem .55rem;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-muted);
  font-size: .76rem;
  cursor: pointer;
}

.tree-breadcrumbs button:not(:last-child)::after {
  margin-left: .12rem;
  color: var(--border-strong);
  content: "›";
  font-size: 1rem;
}

.tree-breadcrumbs button:hover {
  background: var(--tree-card);
  color: var(--ink);
}

.tree-breadcrumbs button.current {
  background: var(--tree-card-raised);
  color: var(--ink-strong);
  font-weight: 700;
}

.work-rail {
  display: grid;
  grid-template-columns: 10.5rem minmax(0, 1fr);
  align-items: center;
  gap: .7rem;
  min-height: 5.4rem;
  padding: .65rem;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--hot), var(--border) 68%);
  border-radius: var(--tree-radius);
  background:
    linear-gradient(100deg,
      color-mix(in srgb, var(--hot), transparent 92%),
      transparent 38%),
    var(--tree-card);
}

.work-rail-heading {
  display: flex;
  align-items: center;
  gap: .65rem;
  min-width: 0;
  padding-inline: .2rem;
}

.work-rail-heading .live-mark {
  animation: tree-pulse 1.8s ease-out infinite;
}

.work-rail-heading h2 {
  color: var(--ink-strong);
  font-size: .88rem;
  line-height: 1.2;
}

.work-rail-heading p {
  margin-top: .15rem;
  color: var(--ink-muted);
  font-size: .67rem;
  line-height: 1.25;
}

.work-rail-list {
  display: flex;
  align-items: stretch;
  gap: .48rem;
  min-width: 0;
  min-height: 3.7rem;
  overflow-x: auto;
  padding: .04rem;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
}

.work-rail-empty {
  display: grid;
  width: 100%;
  min-height: 3.6rem;
  padding: .55rem .8rem;
  place-items: center start;
  border: 1px dashed var(--border);
  border-radius: 10px;
  color: var(--ink-muted);
  font-size: .76rem;
}

.work-card,
.work-rail-item {
  display: grid;
  grid-template-columns: auto minmax(7.5rem, 1fr) auto;
  align-items: center;
  gap: .52rem;
  min-width: 13.5rem;
  max-width: 18rem;
  min-height: 3.6rem;
  padding: .48rem .62rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--canvas);
  color: var(--ink);
  cursor: pointer;
}

.work-card:hover,
.work-rail-item:hover {
  border-color: var(--hot);
  text-decoration: none;
}

.work-card .work-card-mark,
.work-rail-item .work-rail-state {
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--hot), var(--border) 45%);
  border-radius: 50%;
  color: var(--hot);
  font-size: .64rem;
  font-weight: 800;
}

.work-card .work-card-copy,
.work-rail-item .work-rail-copy {
  min-width: 0;
}

.work-card strong,
.work-card span,
.work-rail-item strong,
.work-rail-item span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.work-card strong,
.work-rail-item strong {
  color: var(--ink-strong);
  font-size: .73rem;
}

.work-card span,
.work-rail-item span {
  margin-top: .1rem;
  color: var(--ink-muted);
  font-size: .64rem;
}

.work-card .work-card-progress {
  color: var(--hot);
  font: 700 .64rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.work-rail-item[data-state="active"] {
  border-color: color-mix(in srgb, var(--hot), var(--border) 42%);
}

.work-rail-item[data-state="active"] .work-rail-state {
  color: var(--hot);
  animation: tree-pulse 1.8s ease-out infinite;
}

.work-rail-item[data-state="queued"] .work-rail-state {
  border-style: dashed;
  color: var(--ink-muted);
}

.tree-status {
  display: none;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  min-height: 2.2rem;
  color: var(--ink-muted);
  font-size: .75rem;
}

.tree-status.is-visible,
.tree-status.is-loading,
.tree-status.is-error {
  display: flex;
}

.tree-status.is-error {
  color: var(--lost);
}

.tree-spinner {
  width: .85rem;
  height: .85rem;
  border: 2px solid var(--border-strong);
  border-top-color: var(--hot);
  border-radius: 50%;
  animation: tree-spin .8s linear infinite;
}

.tree-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: .8rem;
  min-width: 0;
}

.tree-panel,
.tree-inspector {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--tree-radius);
  background: var(--tree-card);
  box-shadow: var(--tree-shadow);
}

.tree-panel {
  overflow: hidden;
}

.tree-panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.45rem;
  padding: .7rem .9rem;
  border-bottom: 1px solid var(--border);
}

.tree-panel-heading h2 {
  margin-top: .18rem;
  color: var(--ink-strong);
  font-size: 1rem;
  line-height: 1.2;
}

.tree-panel-heading p {
  max-width: 17rem;
  color: var(--ink-muted);
  font-size: .69rem;
  line-height: 1.35;
  text-align: right;
}

.tree-viewport {
  position: relative;
  width: 100%;
  height: clamp(34rem, 64vh, 49rem);
  min-height: 34rem;
  overflow: hidden;
  overscroll-behavior: contain;
  background-color: var(--tree-canvas);
  background-image:
    radial-gradient(circle at 1px 1px,
      var(--tree-grid) 1px, transparent 1.2px);
  background-size: 22px 22px;
  isolation: isolate;
  touch-action: none;
}

#map-svg {
  display: block;
  width: 100%;
  height: 100%;
  min-width: 100%;
  min-height: 100%;
  overflow: visible;
  outline: 0;
  cursor: grab;
}

#map-svg:active {
  cursor: grabbing;
}

#map-svg:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: -4px;
}

#map-scene {
  transform-origin: 0 0;
}

/* Rendered tree --------------------------------------------------------- */

.tree-link {
  fill: none;
  stroke: var(--tree-line);
  stroke-linecap: round;
  stroke-width: 1.6;
  vector-effect: non-scaling-stroke;
  transition: opacity 140ms ease, stroke 140ms ease,
    stroke-width 140ms ease;
}

.tree-link.is-transposition {
  stroke-dasharray: 4 5;
  opacity: .78;
}

.tree-link.is-active,
.tree-link.is-active-path {
  stroke: var(--tree-line-active);
  stroke-width: 2.4;
}

.tree-link.is-selected-path {
  stroke: var(--hot);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 3px
    color-mix(in srgb, var(--hot), transparent 35%));
}

.tree-link.is-muted {
  opacity: .16;
}

.tree-node {
  color: var(--tree-unknown);
  cursor: pointer;
  outline: none;
}

.tree-node .node-hitbox {
  fill: transparent;
  pointer-events: all;
}

.tree-node .node-card,
.tree-node .tree-node-card {
  fill: var(--tree-card-raised);
  stroke: var(--border-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  transition: fill 140ms ease, stroke 140ms ease,
    stroke-width 140ms ease;
}

.tree-node:hover .node-card,
.tree-node:focus .node-card,
.tree-node:hover .tree-node-card,
.tree-node:focus .tree-node-card {
  fill: var(--tree-card-hover);
  stroke: var(--accent);
}

.tree-node:focus-visible .node-card,
.tree-node:focus-visible .tree-node-card {
  stroke: var(--focus-ring);
  stroke-width: 2.5;
}

.tree-node.is-selected .node-card,
.tree-node.is-selected .tree-node-card {
  stroke: var(--hot);
  stroke-width: 2.5;
}

.tree-node.is-selected-path:not(.is-selected) .node-card,
.tree-node.is-selected-path:not(.is-selected) .tree-node-card {
  stroke: color-mix(in srgb, var(--hot), var(--border-strong) 42%);
  stroke-width: 1.6;
}

.tree-node.is-search-match .node-card,
.tree-node.is-search-match .tree-node-card {
  stroke: var(--accent);
  stroke-width: 2.2;
}

.tree-node.is-muted {
  opacity: .24;
}

.tree-node.is-root .node-card,
.tree-node.is-root .tree-node-card {
  fill: color-mix(in srgb, var(--accent), var(--tree-card-raised) 88%);
}

.tree-node .node-move,
.tree-node .node-eval,
.tree-node .node-detail,
.tree-node .node-result-label,
.tree-node .node-transposition,
.tree-node .tree-node-move,
.tree-node .tree-node-eval,
.tree-node .tree-node-opening,
.tree-node .tree-node-result {
  font-family: "Segoe UI", system-ui, sans-serif;
  pointer-events: none;
  user-select: none;
}

.tree-node .node-move,
.tree-node .tree-node-move {
  fill: var(--ink-strong);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: -.01em;
}

.tree-node .node-eval,
.tree-node .tree-node-eval {
  fill: var(--ink);
  font-size: 11px;
  font-weight: 650;
}

.tree-node .node-detail {
  fill: var(--ink-muted);
  font-size: 9.5px;
}

.tree-node .tree-node-opening {
  fill: var(--ink-muted);
  font-size: 9px;
}

.tree-node .tree-node-result {
  fill: currentColor;
  font-size: 10px;
  font-weight: 850;
  text-anchor: middle;
}

.tree-node .node-result-shape {
  fill: color-mix(in srgb, currentColor, transparent 84%);
  stroke: currentColor;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}

.tree-node .node-result-label {
  fill: var(--ink-strong);
  font-size: 9px;
  font-weight: 850;
  text-anchor: middle;
}

.tree-node .node-work-ring {
  fill: none;
  stroke: var(--hot);
  stroke-dasharray: 4 3;
  stroke-linecap: round;
  stroke-width: 2;
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
  vector-effect: non-scaling-stroke;
}

.tree-node.is-active .node-work-ring {
  opacity: 1;
  animation: tree-ring 3.1s linear infinite;
}

.tree-node.is-queued .node-work-ring {
  opacity: .85;
  animation: none;
  stroke-dasharray: 2 4;
}

.tree-node .node-transposition {
  fill: var(--ink-muted);
  font-size: 8px;
  font-weight: 700;
}

/* The renderer places this group just beyond the card edge. Its transparent
 * 44px target is deliberately larger than the visible control. */
.tree-node .node-toggle,
.tree-node .tree-node-toggle {
  cursor: pointer;
  pointer-events: all;
}

.tree-node .node-toggle-hitbox,
.tree-node .tree-node-toggle-hitbox {
  width: 44px;
  height: 44px;
  fill: transparent;
  pointer-events: all;
}

.tree-node .node-toggle-surface,
.tree-node .tree-node-toggle-surface {
  width: 24px;
  height: 24px;
  fill: var(--tree-card);
  stroke: var(--border-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.tree-node .node-toggle:hover .node-toggle-surface,
.tree-node .node-toggle:focus-visible .node-toggle-surface,
.tree-node .tree-node-toggle:hover .tree-node-toggle-surface,
.tree-node .tree-node-toggle:focus-visible .tree-node-toggle-surface {
  fill: var(--tree-card-hover);
  stroke: var(--accent);
  stroke-width: 2;
}

.tree-node .node-toggle-icon,
.tree-node .tree-node-toggle-icon {
  fill: none;
  stroke: var(--ink);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  pointer-events: none;
  vector-effect: non-scaling-stroke;
}

.tree-node text.tree-node-toggle-icon {
  fill: var(--ink);
  stroke: none;
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  font-weight: 750;
}

.tree-node.status-white-win,
.tree-node[data-status="WHITE_WIN"] {
  color: var(--tree-win);
}

.tree-node.status-black-win,
.tree-node[data-status="BLACK_WIN"] {
  color: var(--tree-loss);
}

.tree-node.status-draw,
.tree-node[data-status="DRAW"] {
  color: var(--tree-draw);
}

.tree-node.status-unknown,
.tree-node[data-status="UNKNOWN"] {
  color: var(--tree-unknown);
}

.tree-node.status-draw .node-result-shape,
.tree-node[data-status="DRAW"] .node-result-shape {
  stroke-width: 2;
}

.tree-node.status-unknown .node-result-shape,
.tree-node[data-status="UNKNOWN"] .node-result-shape {
  fill: transparent;
  stroke-dasharray: 2 2;
}

.tree-empty {
  position: absolute;
  inset: 50% auto auto 50%;
  z-index: 3;
  display: grid;
  width: min(22rem, calc(100% - 2rem));
  min-height: 9rem;
  padding: 1.1rem;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--tree-card), transparent 5%);
  box-shadow: var(--tree-shadow);
  text-align: center;
  transform: translate(-50%, -50%);
}

.tree-empty[hidden] {
  display: none;
}

.tree-empty strong {
  color: var(--ink-strong);
  font-size: 1rem;
}

.tree-empty span {
  color: var(--ink-muted);
  font-size: .8rem;
}

.tree-empty button {
  min-height: 2.35rem;
  padding: .42rem .72rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--tree-card-raised);
  color: var(--ink);
  font-size: .76rem;
  font-weight: 650;
  cursor: pointer;
}

/* Inspector ------------------------------------------------------------- */

.tree-inspector {
  overflow: hidden;
}

.inspector-handle {
  display: none;
  width: 2.8rem;
  height: .24rem;
  margin: .5rem auto 0;
  border-radius: 999px;
  background: var(--border-strong);
}

.inspector-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  min-height: 4.45rem;
  padding: .72rem .85rem;
  border-bottom: 1px solid var(--border);
}

.inspector-header > div {
  min-width: 0;
}

.inspector-header h2 {
  overflow: hidden;
  margin-top: .17rem;
  color: var(--ink-strong);
  font-size: 1rem;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-close {
  display: none;
}

.inspector-content {
  display: grid;
  gap: .72rem;
  padding: .82rem;
}

.inspector-opening {
  min-width: 0;
  padding: .55rem .64rem;
  border: 1px solid var(--opening-border);
  border-radius: 10px;
  background: var(--opening-sheen), var(--tree-card-raised);
}

.inspector-opening[hidden] {
  display: none;
}

.inspector-opening span,
.inspector-line-block > span {
  display: block;
  color: var(--ink-muted);
  font-size: .61rem;
  font-weight: 750;
  letter-spacing: .09em;
  line-height: 1.2;
  text-transform: uppercase;
}

.inspector-opening strong {
  display: block;
  overflow: hidden;
  margin-top: .16rem;
  color: var(--ink-strong);
  font-size: .82rem;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-board-shell {
  display: grid;
  min-width: 0;
  padding: .55rem;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--canvas);
}

.map-board.cg-wrap {
  width: min(100%, 19rem);
  height: auto;
  aspect-ratio: 1;
  overflow: visible;
  border-radius: 7px;
  box-shadow: var(--shadow-board);
}

.map-board cg-board {
  overflow: hidden;
  border-radius: 7px;
}

.map-board coords.files {
  left: 0;
}

.map-board.map-board-fallback {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-template-rows: repeat(8, minmax(0, 1fr));
  overflow: hidden;
  color: #111;
  font-family: "Segoe UI Symbol", "Noto Sans Symbols", serif;
  font-size: clamp(1.25rem, 3.1vw, 2rem);
  line-height: 1;
}

.map-board-fallback .map-board-square {
  display: grid;
  min-width: 0;
  min-height: 0;
  place-items: center;
  user-select: none;
}

.map-board-fallback .map-board-square.light {
  background: var(--sq-l);
}

.map-board-fallback .map-board-square.dark {
  background: var(--sq-d);
}

.inspector-line-block {
  min-width: 0;
  padding: .62rem .68rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--canvas);
}

.inspector-line-block p {
  max-height: 4.35rem;
  overflow: auto;
  margin-top: .3rem;
  color: var(--ink);
  font: 650 .77rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
  overflow-wrap: anywhere;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
}

.position-result {
  display: grid;
  grid-template-columns: 2.35rem minmax(0, 1fr);
  align-items: center;
  gap: .62rem;
  min-height: 3.6rem;
  padding: .55rem .62rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--tree-unknown);
  border-radius: 10px;
  background: var(--tree-card-raised);
}

.result-symbol {
  display: grid;
  width: 2.15rem;
  height: 2.15rem;
  place-items: center;
  border: 2px dashed var(--tree-unknown);
  border-radius: 50%;
  color: var(--ink-strong);
  font-size: .72rem;
  font-weight: 850;
}

.position-result > div {
  min-width: 0;
}

.position-result strong,
.position-result > div > span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.position-result strong {
  color: var(--ink-strong);
  font-size: .8rem;
}

.position-result > div > span {
  margin-top: .13rem;
  color: var(--ink-muted);
  font-size: .68rem;
}

.position-result[data-status="WHITE_WIN"] {
  border-left-color: var(--tree-win);
}

.position-result[data-status="WHITE_WIN"] .result-symbol {
  border-color: var(--tree-win);
  border-style: solid;
  border-radius: 50%;
}

.position-result[data-status="BLACK_WIN"] {
  border-left-color: var(--tree-loss);
}

.position-result[data-status="BLACK_WIN"] .result-symbol {
  border-color: var(--tree-loss);
  border-style: solid;
  border-radius: 3px;
}

.position-result[data-status="DRAW"] {
  border-left-color: var(--tree-draw);
}

.position-result[data-status="DRAW"] .result-symbol {
  width: 2rem;
  height: 1.55rem;
  border-color: var(--tree-draw);
  border-style: double;
  border-radius: 4px;
}

.inspector-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .42rem;
}

.inspector-stats > div {
  min-width: 0;
  min-height: 3.45rem;
  padding: .5rem .56rem;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--canvas);
}

.inspector-stats > div:last-child {
  grid-column: 1 / -1;
}

.inspector-stats dt {
  overflow: hidden;
  color: var(--ink-muted);
  font-size: .61rem;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-stats dd {
  overflow: hidden;
  margin-top: .24rem;
  color: var(--ink-strong);
  font: 720 .8rem/1.1 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-work {
  display: flex;
  align-items: center;
  gap: .5rem;
  min-height: 2.55rem;
  padding: .48rem .6rem;
  border: 1px dashed var(--border-strong);
  border-radius: 9px;
  color: var(--ink-muted);
  font-size: .68rem;
}

.inspector-work.is-active {
  border-color: color-mix(in srgb, var(--hot), var(--border) 40%);
  background: color-mix(in srgb, var(--hot), transparent 93%);
  color: var(--ink);
}

.inspector-work.is-active .work-state-mark {
  animation: tree-pulse 1.8s ease-out infinite;
}

.inspector-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .48rem;
}

.tree-action {
  display: inline-flex;
  min-width: 0;
  min-height: 2.7rem;
  padding: .55rem .65rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  background: var(--canvas);
  color: var(--ink);
  font-size: .72rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
}

.tree-action:hover {
  border-color: var(--accent);
  background: var(--tree-card-hover);
  color: var(--ink-strong);
  text-decoration: none;
}

.tree-action.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-contrast);
}

.tree-action.primary:hover {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
  color: var(--accent-contrast);
}

/* Help ------------------------------------------------------------------ */

.tree-help-dialog {
  width: min(35rem, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  margin: auto;
  overflow: auto;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  background: var(--tree-card);
  color: var(--ink);
  box-shadow: 0 28px 90px rgba(0, 0, 0, .48);
}

.tree-help-dialog::backdrop {
  background: rgba(10, 9, 7, .72);
  backdrop-filter: blur(5px);
}

.tree-help-dialog form {
  padding: 1rem;
}

.help-dialog-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.help-dialog-heading h2 {
  margin-top: .22rem;
  color: var(--ink-strong);
  font-size: 1.25rem;
}

.help-list {
  display: grid;
  gap: .55rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.help-list li {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  align-items: center;
  gap: .65rem;
  min-height: 3.7rem;
  padding: .58rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--canvas);
  color: var(--ink-muted);
  font-size: .78rem;
  line-height: 1.4;
}

.help-list strong {
  color: var(--ink-strong);
}

.help-symbol {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--hot);
}

.help-symbol.branch::before {
  width: 1.65rem;
  height: .8rem;
  border-bottom: 2px solid currentColor;
  border-left: 2px solid currentColor;
  border-radius: 0 0 0 7px;
  content: "";
}

.help-symbol.result {
  border: 2px solid var(--tree-win);
  border-radius: 50%;
  color: var(--ink-strong);
  font-size: .68rem;
  font-weight: 850;
}

.help-symbol.active {
  border: 2px dashed var(--hot);
  border-radius: 50%;
  animation: tree-ring 3.1s linear infinite;
}

.help-shortcuts {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem .8rem;
  padding-top: .8rem;
  border-top: 1px solid var(--border);
  color: var(--ink-muted);
  font-size: .69rem;
}

.help-shortcuts span {
  display: inline-flex;
  align-items: center;
  gap: .24rem;
}

.tree-noscript {
  padding: .75rem .9rem;
  border: 1px solid var(--lost);
  border-radius: 10px;
  background: var(--tree-card);
  color: var(--ink-muted);
  font-size: .78rem;
}

.tree-noscript strong {
  color: var(--ink-strong);
}

/* Responsive layouts --------------------------------------------------- */

@media (min-width: 1200px) {
  .tree-workspace {
    grid-template-columns: minmax(0, 1fr) minmax(19rem, 22rem);
  }

  .tree-inspector {
    position: sticky;
    top: .75rem;
    max-height: calc(100vh - 1.5rem);
    overflow: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb) transparent;
  }

  .tree-viewport {
    height: clamp(36rem, 68vh, 52rem);
  }
}

@media (min-width: 720px) and (max-width: 1199px) {
  .tree-toolbar {
    grid-template-columns: minmax(14rem, 1fr) minmax(23rem, 1.3fr);
  }

  .view-controls {
    grid-column: 1 / -1;
    justify-content: flex-end;
    min-height: 2.75rem;
  }

  .tree-viewport {
    height: clamp(31rem, 57vh, 39rem);
    min-height: 31rem;
  }

  .tree-inspector {
    position: sticky;
    z-index: 6;
    bottom: .5rem;
    max-height: min(34rem, 66vh);
    overflow: auto;
    border-radius: 18px 18px var(--tree-radius) var(--tree-radius);
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb) transparent;
  }

  .inspector-handle {
    display: block;
  }

  .inspector-header {
    min-height: 3.8rem;
    padding-top: .45rem;
  }

  .inspector-close {
    display: inline-grid;
  }

  .tree-inspector.is-collapsed {
    max-height: 4.55rem;
  }

  .tree-inspector.is-collapsed .inspector-content {
    display: none;
  }
}

@media (max-width: 820px) {
  .tree-hero {
    align-items: flex-start;
  }

  .snapshot-status {
    margin: 0;
  }

  .work-rail {
    grid-template-columns: 1fr;
  }

  .work-rail-heading {
    min-height: 2.2rem;
  }
}

@media (min-width: 720px) and (max-width: 1199px) {
  .tree-inspector {
    position: static;
    z-index: auto;
    max-height: none;
    overflow: visible;
    border-radius: var(--tree-radius);
  }

  .tree-inspector .inspector-handle,
  .tree-inspector .inspector-close {
    display: none;
  }

  .tree-inspector.is-collapsed .inspector-content {
    display: grid;
  }
}

@media (max-width: 719px) {
  .move-tree-main {
    margin-top: .75rem;
    padding-inline: .58rem;
  }

  .move-tree {
    gap: .68rem;
  }

  .tree-hero {
    display: grid;
    min-height: 0;
  }

  .tree-heading h1 {
    font-size: 1.8rem;
  }

  .tree-heading p {
    font-size: .82rem;
  }

  .snapshot-actions {
    justify-self: start;
    flex-wrap: wrap;
  }

  .tree-toolbar {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: .48rem;
  }

  .branch-modes {
    order: 2;
  }

  .view-controls {
    order: 3;
    justify-content: stretch;
  }

  .view-controls .tree-icon-button {
    flex: 1 1 2.75rem;
  }

  .view-controls .tree-text-button {
    flex: 2 1 auto;
    justify-content: center;
  }

  .tree-breadcrumbs {
    min-height: 2.25rem;
  }

  .work-rail {
    padding: .52rem;
  }

  .work-rail-list {
    min-height: 3.45rem;
  }

  .tree-panel-heading {
    display: grid;
    min-height: 4.7rem;
  }

  .tree-panel-heading p {
    max-width: none;
    text-align: left;
  }

  .tree-viewport {
    height: clamp(34rem, 62vh, 42rem);
    min-height: 34rem;
    background-size: 18px 18px;
  }

  .tree-inspector {
    position: static;
    max-height: none;
    overflow: visible;
  }

  .tree-inspector .inspector-handle,
  .tree-inspector .inspector-close {
    display: none;
  }

  .tree-inspector.is-collapsed .inspector-content {
    display: grid;
  }

  .map-board.cg-wrap {
    width: min(100%, 19rem);
  }

  .help-shortcuts {
    display: grid;
  }
}

@media (max-width: 420px) {
  .branch-modes span {
    min-height: 2.5rem;
    padding-inline: .35rem;
    font-size: .68rem;
    white-space: normal;
  }

  .tree-text-button span {
    display: none;
  }

  .work-card,
  .work-rail-item {
    min-width: 12rem;
  }

  .tree-panel-heading,
  .inspector-header,
  .inspector-content {
    padding-inline: .65rem;
  }

  .inspector-actions {
    grid-template-columns: 1fr;
  }

  .position-result {
    grid-template-columns: 2.15rem minmax(0, 1fr);
  }

  .help-list li {
    grid-template-columns: 1.9rem minmax(0, 1fr);
  }
}

/* Imagegen reference alignment ----------------------------------------- */

.move-tree [hidden] {
  display: none !important;
}

.move-tree-main {
  max-width: 1800px;
  margin-top: .65rem;
}

.tree-hero {
  min-height: 3.8rem;
  align-items: center;
}

.tree-heading h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.45rem, 2.25vw, 2rem);
  letter-spacing: -.025em;
}

.tree-heading p {
  margin-top: .25rem;
  font-size: .78rem;
}

.tree-toolbar {
  min-height: 3.45rem;
  padding: .38rem;
}

.tree-search {
  height: 2.55rem;
}

.branch-modes span {
  min-height: 2rem;
}

.tree-icon-button,
.tree-text-button {
  height: 2.45rem;
  min-width: 2.45rem;
}

.tree-panel {
  display: grid;
  grid-template-rows: auto minmax(30rem, 1fr) auto;
  min-height: min(51rem, calc(100vh - 8rem));
}

.tree-panel-heading {
  min-height: 3.65rem;
  padding: .55rem .8rem;
}

.tree-viewport {
  height: clamp(35rem, 66vh, 52rem);
  min-height: 35rem;
  background-image:
    radial-gradient(circle at 48% 48%,
      color-mix(in srgb, var(--hot), transparent 96%),
      transparent 42%),
    radial-gradient(circle at 1px 1px,
      var(--tree-grid) 1px, transparent 1.2px);
  background-size: auto, 22px 22px;
}

.tree-legend {
  position: absolute;
  z-index: 3;
  top: .72rem;
  left: .78rem;
  display: flex;
  flex-wrap: wrap;
  gap: .36rem .72rem;
  margin: 0;
  padding: .4rem .55rem;
  border: 1px solid color-mix(in srgb, var(--border), transparent 28%);
  border-radius: 9px;
  background: color-mix(in srgb, var(--tree-canvas), transparent 10%);
  box-shadow: 0 5px 18px rgba(0, 0, 0, .12);
  color: var(--ink-muted);
  font-size: .66rem;
  font-weight: 650;
  line-height: 1;
  list-style: none;
  pointer-events: none;
  backdrop-filter: blur(9px);
}

.tree-legend li {
  display: inline-flex;
  align-items: center;
  gap: .28rem;
  white-space: nowrap;
}

.tree-legend li > span {
  display: inline-grid;
  width: 1.15rem;
  height: 1.15rem;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--tree-unknown);
  font-size: .57rem;
  font-weight: 850;
}

.tree-legend li[data-status="WHITE_WIN"] > span {
  color: var(--tree-win);
}

.tree-legend li[data-status="BLACK_WIN"] > span {
  border-radius: 4px;
  color: var(--tree-loss);
}

.tree-legend li[data-status="DRAW"] > span {
  border-style: double;
  border-width: 2px;
  border-radius: 4px;
  color: var(--tree-draw);
}

.work-rail.work-rail-docked {
  grid-template-columns: 9.5rem minmax(0, 1fr);
  min-height: 0;
  padding: .55rem .7rem .65rem;
  border: 0;
  border-top: 1px solid var(--border);
  border-radius: 0;
  background:
    linear-gradient(100deg,
      color-mix(in srgb, var(--hot), transparent 94%),
      transparent 36%),
    var(--tree-card);
}

.work-rail-docked .work-rail-heading {
  align-self: start;
  min-height: 2.25rem;
  padding-top: .3rem;
}

.work-rail-docked .work-rail-list {
  display: grid;
  gap: .32rem;
  min-height: 2.7rem;
  overflow: visible;
}

.work-rail-docked .work-rail-empty,
.work-rail-docked .work-card,
.work-rail-docked .work-rail-item {
  width: 100%;
  max-width: none;
  min-height: 2.55rem;
}

.work-rail-docked .work-rail-item {
  grid-template-columns: 1.6rem minmax(0, 1fr);
  padding: .35rem .55rem;
  text-align: left;
}

.work-rail-docked .work-rail-copy strong,
.work-rail-docked .work-rail-copy span {
  text-align: left;
}

.work-rail-docked .work-rail-state {
  width: 1.35rem;
  height: 1.35rem;
}

.work-rail-docked .work-rail-item[data-state="active"] {
  background:
    linear-gradient(90deg,
      color-mix(in srgb, var(--hot), transparent 89%),
      transparent 72%),
    var(--canvas);
}

.tree-node.is-selected .node-card,
.tree-node.is-selected .tree-node-card {
  filter:
    drop-shadow(0 0 5px color-mix(in srgb, var(--hot), transparent 24%))
    drop-shadow(0 0 16px color-mix(in srgb, var(--hot), transparent 68%));
}

.tree-node.has-more-branches .node-toggle-surface,
.tree-node.has-more-branches .tree-node-toggle-surface {
  fill: color-mix(in srgb, var(--hot), var(--tree-card) 86%);
  stroke: color-mix(in srgb, var(--hot), var(--border) 42%);
}

.inspector-opening {
  padding: .1rem .08rem .25rem;
  border: 0;
  background: transparent;
}

.inspector-opening strong {
  margin-top: .22rem;
  color: var(--opening-ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.18rem, 1.75vw, 1.48rem);
  font-weight: 650;
  line-height: 1.15;
  overflow-wrap: anywhere;
  text-overflow: clip;
  white-space: normal;
}

.inspector-work.has-descendant-work:not(.is-active) {
  border-color: color-mix(in srgb, var(--hot), var(--border) 52%);
  background: color-mix(in srgb, var(--hot), transparent 96%);
}

@media (min-width: 1200px) {
  .tree-workspace {
    grid-template-columns: minmax(0, 1fr) minmax(20rem, 24rem);
  }

  .tree-inspector {
    top: .55rem;
    max-height: calc(100vh - 1.1rem);
  }
}

@media (max-width: 820px) {
  .tree-panel {
    min-height: 0;
  }

  .work-rail.work-rail-docked {
    grid-template-columns: 1fr;
  }

  .work-rail-docked .work-rail-heading {
    min-height: 2rem;
  }
}

@media (max-width: 719px) {
  .tree-hero {
    gap: .48rem;
  }

  .tree-heading h1 {
    font-size: 1.5rem;
  }

  .tree-heading p {
    font-size: .74rem;
  }

  .tree-viewport {
    height: clamp(36rem, 68vh, 44rem);
    min-height: 36rem;
  }

  .tree-legend {
    top: .5rem;
    left: .5rem;
    gap: .3rem .5rem;
    max-width: calc(100% - 1rem);
  }
}

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

@keyframes tree-ring {
  to { transform: rotate(360deg); }
}

@keyframes tree-pulse {
  0% {
    box-shadow: 0 0 0 0
      color-mix(in srgb, var(--hot), transparent 35%);
  }
  70% {
    box-shadow: 0 0 0 7px
      color-mix(in srgb, var(--hot), transparent 100%);
  }
  100% {
    box-shadow: 0 0 0 0
      color-mix(in srgb, var(--hot), transparent 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .move-tree *,
  .move-tree *::before,
  .move-tree *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (forced-colors: active) {
  .move-tree {
    --tree-canvas: Canvas;
    --tree-grid: transparent;
    --tree-card: Canvas;
    --tree-card-raised: Canvas;
    --tree-card-hover: Canvas;
    --tree-line: CanvasText;
    --tree-line-soft: CanvasText;
    --tree-line-active: Highlight;
    --tree-win: CanvasText;
    --tree-loss: CanvasText;
    --tree-draw: CanvasText;
    --tree-unknown: GrayText;
    forced-color-adjust: auto;
  }

  .tree-node .node-card,
  .tree-node .tree-node-card,
  .tree-node .node-result-shape,
  .tree-link,
  .position-result,
  .result-symbol,
  .help-symbol {
    forced-color-adjust: auto;
  }

  .tree-node.is-selected .node-card,
  .tree-node.is-selected .tree-node-card,
  .tree-node:focus-visible .node-card,
  .tree-node:focus-visible .tree-node-card,
  .tree-node.is-active .node-work-ring {
    stroke: Highlight;
  }

  .snapshot-dot,
  .live-mark,
  .work-state-mark {
    border: 2px solid CanvasText;
    background: Highlight;
    box-shadow: none;
  }

  .branch-modes input:checked + span,
  .tree-action.primary {
    border-color: Highlight;
    background: Highlight;
    color: HighlightText;
  }
}