/* ── Reset & base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0f1117;
  --sidebar-bg:  #1a1d27;
  --panel-bg:    #13151f;
  --border:      #2a2d3e;
  --accent:      #7c6af7;
  --accent-soft: #3d3670;
  --text:        #c9cdd8;
  --text-dim:    #6b7080;
  --text-bright: #eef0f6;
  --folder:      #f0b429;
  --file-md:     #56c8d8;
  --file-img:    #78e08f;
  --hover:       #22263a;
  --active:      #2c2f4a;
  --danger:      #e06c75;
  --radius:      8px;
  --sidebar-w:   360px;
  --header-h:    52px;
  --content-header-h: 38px;
}

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

/* ── Layout ───────────────────────────────────────────────────── */
#app {
  display: grid;
  grid-template-rows: var(--header-h) 1fr;
  grid-template-columns: var(--sidebar-w) 4px 1fr;
  height: 100vh;
}

/* ── Header ───────────────────────────────────────────────────── */
#header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  user-select: none;
  overflow: visible;
  position: relative;
  z-index: 50;
}

#header .logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
#header .logo span { color: var(--text-bright); }
#header .logo #logo-subhead {
  font-size: 0.9rem;
  color: var(--text-dim);
}

/* ── Path dropdown ────────────────────────────────────────────── */
#path-dropdown-wrap {
  margin-left: auto;
  position: relative;
  flex-shrink: 1;
  min-width: 0;
  max-width: 55vw;
}

#path-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.78rem;
  cursor: pointer;
  max-width: 100%;
  transition: border-color 0.15s, background 0.15s;
  white-space: nowrap;
  overflow: hidden;
}
#path-btn:hover { border-color: var(--accent); background: var(--hover); }
#path-btn.open  { border-color: var(--accent); background: var(--hover); }

#path-btn .path-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-dim);
  flex: 1;
  min-width: 0;
  font-size: 0.82rem;
}
#path-btn .path-text.has-path { color: var(--text-bright); font-weight: 500; }

#path-btn .chevron {
  flex-shrink: 0;
  font-size: 0.6rem;
  color: var(--text-dim);
  transition: transform 0.18s;
}
#path-btn.open .chevron { transform: rotate(180deg); }

/* ── Dropdown panel ───────────────────────────────────────────── */
#path-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 380px;
  max-height: 480px;
  overflow-y: auto;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
  z-index: 200;
  flex-direction: column;
}
#path-dropdown.open { display: flex; }
#path-dropdown::-webkit-scrollbar { width: 5px; }
#path-dropdown::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.dd-section-label {
  padding: 8px 12px 6px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.dd-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
  transition: background 0.13s;
  flex-shrink: 0;
}
.dd-item:last-of-type { border-bottom: none; }
.dd-item:hover { background: var(--hover); }
.dd-item.current { background: var(--active); }

.dd-item-body {
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

.dd-item-label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-bright);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: 6px;
}
.dd-current-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 3px;
  padding: 1px 5px;
  flex-shrink: 0;
}

.dd-item-meta {
  font-size: 0.71rem;
  color: var(--text-dim);
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Inline label editor */
.dd-label-input {
  width: 100%;
  padding: 3px 7px;
  border-radius: 4px;
  border: 1px solid var(--accent);
  background: var(--bg);
  color: var(--text-bright);
  font-size: 0.84rem;
  font-weight: 600;
  outline: none;
  margin-bottom: 2px;
}

.dd-item-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.dd-icon-btn {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.72rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.13s, color 0.13s, border-color 0.13s;
  flex-shrink: 0;
}
.dd-icon-btn:hover {
  background: var(--hover);
  border-color: var(--border);
  color: var(--text-bright);
}
.dd-icon-btn.danger:hover {
  background: rgba(224,108,117,0.15);
  border-color: var(--danger);
  color: var(--danger);
}
.dd-icon-btn.confirm:hover {
  background: rgba(124,106,247,0.15);
  border-color: var(--accent);
  color: var(--accent);
}

.dd-divider { height: 1px; background: var(--border); flex-shrink: 0; }

.dd-action {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  font-size: 0.81rem;
  color: var(--accent);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.13s;
  flex-shrink: 0;
}
.dd-action:hover { background: var(--hover); }

/* ── Modal overlay (nickname prompt) ──────────────────────────── */
#modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  z-index: 500;
  align-items: center;
  justify-content: center;
}
#modal-overlay.open { display: flex; }

#modal {
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 22px;
  width: 380px;
  max-width: 90vw;
  box-shadow: 0 12px 48px rgba(0,0,0,0.7);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#modal h3 {
  font-size: 1rem;
  color: var(--text-bright);
  font-weight: 600;
}
#modal p {
  font-size: 0.83rem;
  color: var(--text-dim);
  line-height: 1.55;
}
#modal-input {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-bright);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
}
#modal-input:focus { border-color: var(--accent); }

.modal-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: -8px;
}

#modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 4px;
}

.modal-btn {
  padding: 7px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.modal-btn:hover { background: var(--hover); border-color: var(--accent); color: var(--text-bright); }
.modal-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.modal-btn.primary:hover { background: #6a59e0; }

/* ── Sidebar ──────────────────────────────────────────────────── */
#sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 160px;
  max-width: 80vw;
}

#sidebar-toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  height: var(--content-header-h);
}

.tb-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 0.76rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
  user-select: none;
  height: 100%;
}
.tb-btn:hover {
  background: var(--accent);
  color: var(--text-bright);
}
.tb-btn.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--text-bright);
}
.tb-btn .btn-icon { font-size: 0.85rem; }

/* Sort segmented pill control */
.sort-segment {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 5px;
  overflow: hidden;
  background: transparent;
  height: 100%;
}

.sort-seg-btn {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 4px 9px 4px 5px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.sort-seg-btn + .sort-seg-btn {
  border-left: 1px solid var(--border); /* dividing line */
}

.sort-seg-btn:hover {
  background: var(--accent);
  color: var(--text-bright);
}
.sort-seg-btn.active {
  background: var(--accent-soft);
  color: var(--text-bright);
}

#filter-bar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}

.filter-input-wrap {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
}

#filter-input {
  width: 100%;
  padding: 5px 28px 5px 9px;  /* right padding for inset X */
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-bright);
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.15s;
}
#filter-input:focus { border-color: var(--accent); }
#filter-input::placeholder { color: var(--text-dim); }

.filter-clear-btn {
  position: absolute;
  right: 6px;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  line-height: 1;
  transition: background 0.13s, border-color 0.13s, color 0.13s;
}
.filter-clear-btn:hover {
  background: var(--hover);
  border-color: var(--border);
  color: var(--text-bright);
}
.filter-clear-btn.hidden {
  display: none;
}

#tree-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px 0 20px;
}
#tree-scroll::-webkit-scrollbar { width: 5px; }
#tree-scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ── Resize handle ────────────────────────────────────────────── */
#resizer {
  grid-row: 2;
  grid-column: 2;
  background: var(--border);
  cursor: col-resize;
  transition: background 0.15s;
  z-index: 20;
}
#resizer:hover, #resizer.dragging { background: var(--accent); }

/* ── Tree nodes ───────────────────────────────────────────────── */
.tree-node { width: 100%; }

.tree-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px 5px 0;
  cursor: pointer;
  border-radius: 5px;
  transition: background 0.14s;
  white-space: nowrap;
  overflow: hidden;
}
.tree-row:hover  { background: var(--hover); }
.tree-row.active { background: var(--active); }
.tree-row.active .row-name { color: var(--text-bright); }
.tree-row.dim-folder .row-name { color: var(--text-dim); }
.tree-row.dim-folder .row-icon { opacity: 0.45; }

/* Keyboard-focused tree row */
.tree-row.kb-focus {
  outline: 1px solid var(--accent);
  outline-offset: -1px;
}

.row-arrow {
  flex-shrink: 0;
  width: 14px;
  font-size: 0.65rem;
  color: var(--text-dim);
  transition: transform 0.18s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.row-arrow.open { transform: rotate(90deg); }
.row-arrow.leaf { visibility: hidden; }

.row-icon { flex-shrink: 0; font-size: 0.95rem; }
.row-name { font-size: 0.84rem; color: var(--text); overflow: hidden; text-overflow: ellipsis; }

.tree-children { overflow: hidden; transition: max-height 0.22s ease; }
.tree-children.collapsed { max-height: 0 !important; }

/* Keyboard hint chip at bottom of tree panel */
.kbd-hint-chip {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 8px;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.74rem;
  line-height: 1.35;

  opacity: 1;
  transition: opacity 2000ms ease;
}

.kbd-hint-chip.is-hiding { opacity: 0; }

.kbd-hint-text { min-width: 0; }

.kbd-hint-close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.76rem;
  transition: background 0.13s, border-color 0.13s, color 0.13s;
}
.kbd-hint-close:hover {
  background: var(--hover);
  border-color: var(--border);
  color: var(--text-bright);
}

/* ── File tooltip ─────────────────────────────────────────────── */
#file-tooltip {
  position: fixed;
  z-index: 999;
  pointer-events: none;
  display: none;
  flex-direction: column;
  gap: 3px;
  padding: 8px 11px;
  background: #1e2235;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 6px 24px rgba(0,0,0,0.55);
  max-width: 400px;
}
#file-tooltip.visible { display: flex; }

.tt-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-bright);
  word-break: break-all;
}
.tt-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-dim);
}
.tt-row .tt-icon { font-size: 0.8rem; }
.tt-row .tt-val  { color: var(--text); }

/* ── Content ──────────────────────────────────────────────────── */
#content {
  grid-row: 2;
  grid-column: 3;
  background: var(--panel-bg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#content-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  height: var(--content-header-h);
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  color: var(--text);
  font-weight: 500;
  flex-shrink: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.82rem;
}
.file-date {
  font-size:0.74rem;
  color:var(--text-dim);
  white-space:nowrap;
  flex-shrink:0;
  overflow: hidden;
  text-overflow: ellipsis;
  display:none;
  margin-left:10px;
  flex:1;
}

#img-toolbar { display: none; align-items: center; gap: 6px; flex-shrink: 0; }
#img-toolbar.visible { display: flex; }

.img-tb-btn {
  padding: 3px 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 0.76rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.img-tb-btn:hover  { background: var(--hover); border-color: var(--accent); color: var(--text-bright); }
.img-tb-btn.active { background: var(--accent-soft); border-color: var(--accent); color: var(--text-bright); }

#content-body {
  flex: 1;
  overflow: auto;
  padding: 28px 36px;
}
#content-body::-webkit-scrollbar { width: 6px; }
#content-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ── Welcome / splash ─────────────────────────────────────────── */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 14px;
  text-align: center;
}
.welcome .big-icon { font-size: 3.5rem; }
.welcome h2 { font-size: 1.1rem; color: var(--text); font-weight: 600; }
.welcome p  { font-size: 0.85rem; max-width: 360px; line-height: 1.6; color: var(--text-dim); }

.welcome button {
  margin-top: 8px;
  padding: 9px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, color 0.18s;
}
.welcome button:hover { background: var(--accent); color: #fff; }
.welcome a { font-size: 0.8rem; color: var(--text-dim); text-decoration: none; }
.welcome a:hover { color: var(--text); text-decoration: underline; }

/* ── Plain-text display ───────────────────────────────────────── */
#text-output {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-bright);
  white-space: pre-wrap;
  word-break: break-word;
  tab-size: 4;
}

/* ── Image viewer ─────────────────────────────────────────────── */
#img-output { display: flex; align-items: flex-start; justify-content: center; }

#img-output img {
  display: block;
  box-shadow: 0 0 16px rgb(115 108 161);
}
#img-output img.zoom-fit-width  { width: 100%; height: auto; }
#img-output img.zoom-fit-height { width: auto; height: calc(100vh - var(--header-h) - var(--content-header-h) - 56px - 20px); max-width: none; }
#img-output img.zoom-full       { width: auto; height: auto; max-width: none; }

#img-output object {
  display: block;
  box-shadow: 0 0 16px rgb(115 108 161);
  background: #fff;
}
#img-output object.zoom-fit-width  { width: 100%; min-height: 300px; }
#img-output object.zoom-fit-height { width: auto; height: calc(100vh - var(--header-h) - var(--content-header-h) - 56px - 20px); min-width: 300px; }
#img-output object.zoom-full       { width: auto; min-height: 200px; min-width: 200px; }

.err-msg { color: var(--danger); padding: 20px; font-size: 0.88rem; }

* { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }