/* Explorer: folder tree (on the frame) · list card · preview card, with resizable splitters. */
.explorer {
  height: 100%; display: grid; min-height: 0;
  grid-template-columns: var(--tree-w) .5rem minmax(18.75rem, 1fr) .5rem minmax(23.75rem, var(--preview-w));
  grid-template-rows: minmax(0, 1fr);
  padding: .5rem .5rem .5rem 0;
}
.explorer > * { min-width: 0; min-height: 0; }
.explorer.pv-max { grid-template-columns: 0 0 0 0 1fr; padding-left: .5rem; }
.explorer.pv-max > .tree-pane, .explorer.pv-max > .list-pane, .explorer.pv-max > .splitter { visibility: hidden; overflow: hidden; }

/* Splitters */
.splitter { position: relative; cursor: col-resize; touch-action: none; }
.splitter::after {
  content: ""; position: absolute; top: .75rem; bottom: .75rem; left: .1875rem; width: 2px; border-radius: 2px;
  background: transparent; transition: background var(--t-fast) var(--ease);
}
.splitter:hover::after, .splitter:focus-visible::after, body.is-resizing .splitter:hover::after { background: var(--accent); }
.splitter:focus-visible { outline: none; }
body.is-resizing { cursor: col-resize; user-select: none; }
body.is-resizing iframe, body.is-resizing canvas { pointer-events: none; }

/* ------------------------------------------------------------ tree pane
   Hierarchy cues: top-level folders are stronger and tinted by area (models, particles, sounds…); an expanded folder is a
   group with a tinted rail from its chevron to its last child; deeper levels step in and quiet down; expanded ancestors
   stay pinned at the top (stacked sticky rows) so you always know which folder you are inside. */
.tree-pane { --tree-bg: var(--bg); --tree-row-h: 1.75rem; display: flex; flex-direction: column; background: var(--tree-bg); }
.pane-head { display: flex; align-items: center; gap: .25rem; height: 2.5rem; padding: 0 .5rem 0 1.125rem; flex: none; }
.pane-title { flex: 1; color: var(--text-3); font-size: .6875rem; font-weight: 650; letter-spacing: .09em; text-transform: uppercase; }
.tree-scroll { flex: 1; min-height: 0; overflow: auto; padding: 0 0 1rem; }
.tree { width: 100%; }
.tree-item { outline: none; }
/* Indented by margin, not padding: hover/selected/header backgrounds start at the row's own chevron, so the rails of
   the folders it is inside run past them instead of cutting through. */
.tree-row {
  display: flex; align-items: center; gap: .375rem; height: var(--tree-row-h); margin: 0 .5rem 0 calc(.5rem + var(--level) * 1rem);
  padding: 0 .5rem 0 .25rem; border-radius: var(--r-sm); color: var(--text-2);
  cursor: pointer; white-space: nowrap; font-size: .8125rem; user-select: none;
  scroll-margin-top: calc(var(--level) * var(--tree-row-h));
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.tree-row:hover { background: var(--surface-2); color: var(--text); }
.tree-item.selected > .tree-row { background: var(--surface-3); color: var(--text); box-shadow: inset 2px 0 0 var(--accent); }
.tree-item:focus-visible > .tree-row { outline: 2px solid var(--focus); outline-offset: -2px; }
.tree-root > .tree-row { font-family: var(--font-mono); font-size: .7812rem; font-weight: 600; color: var(--text); }
.tree-toggle { display: grid; place-items: center; width: 1rem; height: 1rem; color: var(--text-3); flex: none; border-radius: .25rem; transition: transform var(--t-fast) var(--ease); }
.tree-toggle:hover { color: var(--text); }
.tree-item[aria-expanded="true"] > .tree-row .tree-toggle { transform: rotate(90deg); color: var(--tint, var(--text-2)); }
.tree-item.leaf > .tree-row .tree-toggle { visibility: hidden; }
.tree-row .file-icon { width: 1.125rem; height: 1.125rem; }
.tree-row .file-icon svg { width: 1rem; height: 1rem; }
.tree-row .file-icon.cat-folder { color: color-mix(in srgb, var(--tint, var(--cat-folder)) 70%, var(--text-3)); }
.tree-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; padding-right: .5rem; }
.tree-count { margin-left: auto; flex: none; display: inline-flex; align-items: center; gap: .375rem; color: var(--text-3); font: .6875rem var(--font-mono); font-variant-numeric: tabular-nums; }
.tree-bar { width: 1.375rem; height: .25rem; gap: 1px; }
.tree-item.selected > .tree-row .tree-count { color: var(--text-2); }

/* Top-level areas */
.tree-item[aria-level="2"] { margin-top: .125rem; }
.tree-item[aria-level="2"] > .tree-row { color: var(--text); font-weight: 550; }
.tree-item[aria-level="2"] > .tree-row .file-icon.cat-folder { color: var(--tint); }
.tree-item[aria-level="2"][aria-expanded="true"] { margin-bottom: .375rem; }
/* Deeper levels: a touch smaller and quieter */
.tree-item[aria-level="4"] > .tree-row, .tree-item[aria-level="5"] > .tree-row, .tree-item[aria-level="6"] > .tree-row,
.tree-item[aria-level="7"] > .tree-row, .tree-item[aria-level="8"] > .tree-row { font-size: .7812rem; }

/* Expanded folder = group header, pinned while you scroll through its contents */
.tree-item[aria-expanded="true"] > .tree-row {
  position: sticky; top: calc(var(--level) * var(--tree-row-h)); z-index: calc(30 - var(--level));
  color: var(--text); background-color: color-mix(in srgb, var(--tint, var(--text-3)) 10%, var(--tree-bg));
  box-shadow: .5rem 0 0 var(--tree-bg);
}
.tree-root[aria-expanded="true"] > .tree-row { background-color: var(--tree-bg); }
.tree-item.selected[aria-expanded="true"] > .tree-row {
  background-color: color-mix(in srgb, var(--tint, var(--accent)) 16%, var(--tree-bg));
  box-shadow: inset 2px 0 0 var(--accent), .5rem 0 0 var(--tree-bg);
}
.tree-item[aria-expanded="true"] > .tree-row:hover { background-color: color-mix(in srgb, var(--tint, var(--text-3)) 16%, var(--tree-bg)); }

/* Group rail: from the parent's chevron down to its last child, in the area tint */
.tree-group { position: relative; }
.tree-group::before {
  content: ""; position: absolute; top: 0; bottom: .375rem; width: 1px; border-radius: 1px;
  left: calc(.5rem + .25rem + var(--level) * 1rem + .5rem - .5px);
  background: color-mix(in srgb, var(--tint, var(--line-2)) 45%, transparent);
}
.tree-item[aria-level="2"] > .tree-group::before { width: 2px; background: color-mix(in srgb, var(--tint) 65%, transparent); }
.tree-root > .tree-group::before { display: none; }
.tree-loading { display: flex; align-items: center; gap: .5rem; height: var(--tree-row-h); padding-left: calc(1.875rem + var(--level) * 1rem); color: var(--text-3); font-size: .75rem; }
.tree-loading .sk-text { width: 5.625rem; }
.tree-loading.error { color: var(--removed-text); }

/* ------------------------------------------------------------ list pane */
/* When the change-kind chips don't fit (narrow pane, longer translations, bigger UI scale), they keep their colour
   dot and count; the label stays available to screen readers and in the tooltip. Toggled by Explorer.fitFilters(). */
.filter-bar.compact .kinds .seg-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.filter-bar.compact .kinds .seg { padding: 0 .5625rem; }
.filter-bar.compact .kinds .seg[aria-pressed="true"] .seg-label { position: static; width: auto; height: auto; overflow: visible; clip-path: none; }
.list-pane, .preview-pane {
  display: flex; flex-direction: column; background: var(--surface-1); border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden;
}
.list-head { display: flex; align-items: center; gap: .375rem; height: 3rem; padding: 0 .5rem 0 .625rem; border-bottom: 1px solid var(--line); flex: none; }
.folders-btn { display: none; }
.breadcrumb { flex: 1; min-width: 0; }
.crumbs { display: flex; align-items: center; gap: 1px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; padding: 2px; }
.crumbs::-webkit-scrollbar { display: none; }
.crumbs.scrolled { -webkit-mask-image: linear-gradient(to right, transparent 0, #000 1.75rem); mask-image: linear-gradient(to right, transparent 0, #000 1.75rem); }
.crumb { display: inline-flex; align-items: center; padding: .25rem .375rem; border-radius: .3125rem; color: var(--text-2); font-size: .8125rem; flex: none; }
a.crumb:hover { background: var(--surface-3); color: var(--text); }
.crumb.current { color: var(--text); font-weight: 600; }
.crumb-root { display: inline-flex; align-items: center; gap: .375rem; font: 600 .7812rem var(--font-mono); }
.crumb-root .icon { color: var(--accent); }
.crumb-sep { color: var(--text-3); padding: 0 1px; flex: none; }
.view-switch { flex: none; }

.filter-bar { display: flex; align-items: center; gap: .5rem; padding: .625rem .75rem; border-bottom: 1px solid var(--line); flex: none; overflow-x: auto; scrollbar-width: none; }
.filter-bar::-webkit-scrollbar { display: none; }
.filter-select {
  display: inline-flex; align-items: center; gap: .4375rem; height: 2.125rem; padding: 0 .625rem; border-radius: .5rem; flex: none;
  border: 1px solid var(--line); background: var(--surface-2); color: var(--text-2); font-size: .8125rem; font-weight: 500;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.filter-select:hover, .filter-select[aria-expanded="true"] { border-color: var(--text-3); color: var(--text); }
.filter-select.active { color: var(--text); border-color: var(--accent-line); background: var(--accent-soft); font-family: var(--font-mono); font-size: .7812rem; }
.filter-select-icon .file-icon { width: 1rem; height: 1rem; }
.filter-select-icon .file-icon svg { width: .9375rem; height: .9375rem; }
.filter-chip {
  display: inline-flex; align-items: center; gap: .375rem; height: 1.875rem; padding: 0 .5rem 0 .625rem; border-radius: 62.4375rem; flex: none;
  background: var(--surface-3); color: var(--text); font-size: .7812rem; max-width: 13.75rem;
}
.filter-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.filter-chip .icon:last-child { color: var(--text-3); }
.filter-chip:hover .icon:last-child { color: var(--text); }

.list-summary { display: flex; align-items: center; gap: .75rem; min-height: 2rem; padding: .375rem .875rem; border-bottom: 1px solid var(--line); color: var(--text-2); font-size: .7812rem; flex: none; }
.list-summary > span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.summary-link { display: inline-flex; align-items: center; gap: .25rem; color: var(--accent); font-weight: 550; white-space: nowrap; }
.summary-link:hover { text-decoration: underline; text-underline-offset: .1875rem; }

.list-viewport { position: relative; flex: 1; min-height: 0; overflow: auto; outline: none; overscroll-behavior: contain; }
.list-viewport:focus-visible { box-shadow: inset 0 0 0 2px var(--focus); }
.vl-spacer { position: relative; width: 100%; }
.vl-footer { position: absolute; left: 0; right: 0; top: 0; height: 3rem; display: grid; place-items: center; }
.vl-footer.loading::after { content: ""; width: 1.125rem; height: 1.125rem; border-radius: 50%; border: 2px solid var(--line-2); border-top-color: var(--accent); animation: spin .8s linear infinite; }
.list-skeleton { padding-top: .25rem; }

.row {
  position: absolute; left: 0; top: 0; display: grid; grid-template-columns: 1.25rem minmax(0, 1fr) auto auto; align-items: center; gap: .625rem;
  padding: 0 .75rem 0 .875rem; cursor: pointer; font-size: .8125rem; border-bottom: 1px solid var(--line); user-select: none;
  transition: background var(--t-fast) var(--ease);
}
.row:hover { background: var(--surface-2); }
.row.selected { background: var(--accent-soft); box-shadow: inset 2px 0 0 var(--accent); }
.list-viewport:focus-visible .row.selected { box-shadow: inset 2px 0 0 var(--accent), inset 0 0 0 1px var(--accent-line); }
.row-main { display: flex; align-items: baseline; gap: .625rem; min-width: 0; }
.row-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 0 1 auto; }
.row.folder .row-name { font-weight: 550; }
.row.k-removed .row-name { color: var(--text-2); text-decoration: line-through; text-decoration-color: var(--removed); text-decoration-thickness: 1px; }
.row-dir { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-3); font: .7188rem var(--font-mono); }
.list-viewport.is-tall .row-main { flex-direction: column; align-items: stretch; gap: 1px; }
.list-viewport.is-tall .row-dir { flex: none; }
.row-size { display: flex; align-items: center; justify-content: flex-end; gap: .5rem; color: var(--text-2); font: .75rem var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.row-size small { font-size: .6875rem; }
.row-end { display: flex; align-items: center; justify-content: flex-end; min-width: 1.375rem; }
.row .ext-chip { max-width: 5.625rem; }

.list-viewport.is-grid .vl-spacer { min-height: 100%; }
.tile {
  position: absolute; left: 0; top: 0; display: flex; flex-direction: column; padding: .375rem; border-radius: var(--r-md);
  border: 1px solid transparent; cursor: pointer; user-select: none; transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.tile:hover { background: var(--surface-2); }
.tile.selected { background: var(--accent-soft); border-color: var(--accent-line); }
.tile-thumb {
  position: relative; flex: 1; min-height: 0; display: grid; place-items: center; overflow: hidden;
  border-radius: .4375rem; background-color: var(--surface-2); border: 1px solid var(--line);
}
.tile-thumb img { max-width: calc(100% - .75rem); max-height: calc(100% - .75rem); object-fit: contain; }
.tile-thumb img.thumb-3d { max-width: 100%; max-height: 100%; width: 100%; height: 100%; object-fit: cover; }
.tile-thumb.has-render { background: #161c24; }
.tile-thumb img.pixelated { image-rendering: pixelated; width: 64%; height: 64%; }
.tile-thumb > .file-icon { width: 42%; height: 42%; max-width: 4rem; max-height: 4rem; opacity: .9; }
.tile-thumb > .file-icon svg { width: 100%; height: 100%; stroke-width: 1.2; }
.tile.folder .tile-thumb { background: transparent; border-style: dashed; }
.tile-thumb .kind-badge { position: absolute; top: .375rem; left: .375rem; box-shadow: 0 0 0 2px var(--surface-1); }
.tile-ext { position: absolute; right: .375rem; bottom: .375rem; padding: 0 .3125rem; border-radius: .25rem; background: var(--surface-3); color: var(--text-2); font: .6562rem/1.0625rem var(--font-mono); }
.tile-name {
  margin-top: .4375rem; padding: 0 2px; font-size: .75rem; line-height: .9375rem; font-weight: 500; overflow: hidden; overflow-wrap: anywhere;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; line-clamp: 2;
}
.tile.k-removed .tile-name { color: var(--text-2); text-decoration: line-through; text-decoration-color: var(--removed); }
.tile-meta { padding: 0 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-3); font: .6875rem/1.5 var(--font-mono); }

/* Type filter popover */
.type-popover { width: 21.25rem; }
.type-panel { display: flex; flex-direction: column; max-height: inherit; }
.type-search { position: relative; display: flex; align-items: center; padding: .5rem; border-bottom: 1px solid var(--line); }
.type-search .icon { position: absolute; left: 1.125rem; color: var(--text-3); }
.type-search .input { width: 100%; padding-left: 2rem; }
.type-list { overflow: auto; padding: .375rem; max-height: 22.5rem; }
.type-option { display: grid; grid-template-columns: 1.25rem minmax(0, 1fr) 3.75rem auto; align-items: center; gap: .625rem; width: 100%; padding: .375rem .5rem; border-radius: var(--r-sm); text-align: left; }
.type-option:hover, .type-option:focus-visible { background: var(--surface-3); outline: none; }
.type-option[aria-selected="true"] { background: var(--accent-soft); }
.type-option .file-icon { width: 1.125rem; height: 1.125rem; }
.type-option .file-icon svg { width: 1rem; height: 1rem; }
.type-option > .icon { color: var(--text-2); }
.type-name { display: flex; flex-direction: column; min-width: 0; font: 550 .7812rem var(--font-mono); }
.type-name small { font: .7188rem var(--font-ui); color: var(--text-3); }
.type-option:first-child .type-name { font-family: var(--font-ui); font-size: .8125rem; }
.type-meter { height: .25rem; border-radius: 2px; background: var(--surface-3); overflow: hidden; }
.type-meter span { display: block; height: 100%; border-radius: 2px; background: var(--text-3); }
.type-count { color: var(--text-2); font: .75rem var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }
.type-empty { padding: 1rem; color: var(--text-3); text-align: center; font-size: .8125rem; }

.drawer-scrim { display: none; }
.mobile-only { display: none !important; }

/* ------------------------------------------------------------ responsive explorer */
@media (max-width: 1180px) {
  .explorer { grid-template-columns: var(--tree-w) .5rem minmax(0, 1fr) 0 0; }
  .explorer > #previewSplitter { display: none; }
  .preview-pane {
    position: fixed; z-index: 45; top: calc(var(--topbar-h) + .5rem); right: .5rem; bottom: .5rem; width: min(45rem, calc(100vw - 6rem));
    box-shadow: var(--shadow-pop); transform: translateX(calc(100% + 1.5rem)); visibility: hidden;
    transition: transform var(--t-slow) var(--ease), visibility 0s linear var(--t-slow);
  }
  .explorer.has-file .preview-pane { transform: none; visibility: visible; transition: transform var(--t-slow) var(--ease); }
  .explorer.pv-max { grid-template-columns: var(--tree-w) .5rem minmax(0, 1fr) 0 0; padding-left: 0; }
  .explorer.pv-max > .tree-pane, .explorer.pv-max > .list-pane, .explorer.pv-max > .splitter { visibility: visible; }
}
@media (max-width: 900px) {
  :root { --tree-w: 13.75rem; }
}
@media (max-width: 760px) {
  .explorer { grid-template-columns: minmax(0, 1fr); padding: 0; }
  .explorer > .splitter { display: none; }
  .list-pane { border: 0; border-radius: 0; }
  .folders-btn { display: inline-grid; }
  .mobile-only { display: inline-grid !important; }
  .tree-pane {
    position: fixed; z-index: 50; top: 0; bottom: 0; left: 0; width: min(86vw, 21.25rem); padding-top: env(safe-area-inset-top);
    background: var(--surface-1); border-right: 1px solid var(--line); box-shadow: var(--shadow-pop);
    transform: translateX(-100%); visibility: hidden; transition: transform var(--t-slow) var(--ease), visibility 0s linear var(--t-slow);
  }
  .tree-pane.open { transform: none; visibility: visible; transition: transform var(--t-slow) var(--ease); }
  .pane-head { height: 3.25rem; }
  .tree-pane { --tree-bg: var(--surface-1); --tree-row-h: 2.375rem; }
  .drawer-scrim { display: block; position: fixed; inset: 0; z-index: 49; background: var(--scrim); opacity: 0; pointer-events: none; transition: opacity var(--t-slow) var(--ease); }
  .drawer-scrim.show { opacity: 1; pointer-events: auto; }
  .list-head { height: 3.125rem; padding: 0 .5rem; }
  .filter-bar { padding: .5rem .75rem; }
  .filter-bar .kinds .seg-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .filter-bar .kinds .seg { padding: 0 .5625rem; }
  .list-summary { padding: .375rem 1rem; }
  .list-summary > span:first-child { white-space: normal; overflow: visible; line-height: 1.35; }
  .row { padding: 0 1rem; gap: .625rem; grid-template-columns: 1.25rem minmax(0, 1fr) auto auto; }
  .list-viewport.mode-phone .row-size { display: none; }
  .preview-pane {
    position: fixed; z-index: 55; inset: 0; width: auto; top: 0; right: 0; bottom: 0; left: 0; border-radius: 0; border: 0;
    transform: translateY(100%); padding-top: env(safe-area-inset-top);
  }
  .explorer.has-file .preview-pane { transform: none; }
}