/* Ensure HTML [hidden] attribute always wins, even when CSS sets display explicitly */
[hidden] { display: none !important; }

:root {
  --bg: #313338;
  --toolbar-bg: #2b2d31;
  --border: #1e1f22;
  --text: #f1f3f5;
  --text-muted: #ccd1dc;
  --accent: #afc2e0;
  --active-bg: #404249;
  --sidebar-width: 240px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-family: 'gg sans', 'Noto Sans TC', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR',
               'PingFang TC', 'PingFang SC', 'Microsoft JhengHei', 'Microsoft YaHei',
               'Hiragino Sans', 'Yu Gothic', 'Malgun Gothic',
               -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

/* ============================================================
   Toolbar
   ============================================================ */

#toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 10px;
  background: var(--toolbar-bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 8px;
  overflow: hidden;
  container-type: inline-size;
}

#toolbar-left {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

/* Empty state: hide most toolbar controls when no PDF is loaded */
#toolbar.empty-state #toolbar-left > :not(#sidebar-btn),
#toolbar.empty-state #toolbar-right > :not(#chat-btn):not(#settings-dropdown) {
  display: none !important;
}

/* 響應式：toolbar 寬度不足時逐級隱藏元素，確保 AI 聊天永遠可見 */
@container (max-width: 700px) {
  #toolbar-center { display: none !important; }
}
@container (max-width: 550px) {
  .zoom-group, .sep-zoom { display: none !important; }
}
@container (max-width: 400px) {
  .page-indicator, .sep-page { display: none !important; }
}
@container (max-width: 330px) {
}
@container (max-width: 320px) {
  #settings-dropdown,
  #settings-dropdown + .tb-sep { display: none !important; }
}
@container (max-width: 270px) {
  #download-btn,
  #download-btn + .tb-sep { display: none !important; }
}
@container (max-width: 220px) {
  #sidebar-btn { display: none !important; }
}

#toolbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

#toolbar-center {
  flex: 1;
  text-align: center;
  font-size: 15px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  min-width: 0;
}

#toolbar button {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
}

#toolbar button:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

#toolbar button:disabled {
  opacity: 0.3;
  cursor: default;
}

#toolbar button.active {
  background: var(--active-bg);
  color: var(--accent);
}


.tb-sep {
  width: 1px;
  height: 20px;
  background: #464a52;
  margin: 0 2px;
  flex-shrink: 0;
}

.page-indicator {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 88px;
  justify-content: center;
}

.zoom-group {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 88px;
  justify-content: center;
}

#page-input {
  width: 36px;
  background: var(--border);
  border: 1px solid #3a3c42;
  color: var(--text-muted);
  text-align: center;
  border-radius: 4px;
  padding: 2px 4px;
  font-size: 13px;
  font-family: inherit;
}

#page-input:focus {
  outline: none;
  border-color: var(--accent);
}

#page-input::-webkit-outer-spin-button,
#page-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

#zoom-input {
  font-size: 13px;
  color: var(--text-muted);
  background: var(--border);
  border: 1px solid #3a3c42;
  border-radius: 4px;
  width: 44px;
  text-align: center;
  outline: none;
  font-family: inherit;
  padding: 2px 4px;
}
#zoom-input:focus {
  border-color: var(--accent);
  color: var(--text);
}

/* ============================================================
   Highlight color picker
   ============================================================ */

/* Tool dropdown (highlight & ink) */
.tool-dropdown {
  display: flex;
  align-items: center;
}


.dropdown-chevron {
  opacity: 0.5;
  flex-shrink: 0;
}

.dropdown-panel {
  position: fixed;
  display: none;
  background: var(--toolbar-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px;
  z-index: 10000;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.dropdown-panel.open {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 120px;
}

#download-panel .dropdown-item {
  padding: 5px 10px;
  font-size: 12px;
}

.dropdown-item {
  background: none;
  border: none;
  color: var(--text);
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
  text-align: left;
  border-radius: 4px;
  white-space: nowrap;
}
.dropdown-item:hover {
  background: rgba(255, 255, 255, 0.1);
}
.dropdown-item.active {
  color: var(--accent);
  background: rgba(136, 159, 202, 0.1);
}


.dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 2px 0;
}
#settings-panel .dropdown-divider {
  background: rgba(255,255,255,0.08);
  margin: 4px 0;
}

/* Context menu (right-click on selected text) */
.context-menu {
  position: fixed;
  background: var(--toolbar-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px;
  z-index: 20000;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 140px;
}
.context-menu-item {
  background: none;
  border: none;
  color: var(--text);
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
  text-align: left;
  border-radius: 4px;
  white-space: nowrap;
}
.context-menu-item:hover {
  background: rgba(255, 255, 255, 0.1);
}

.tool-switch-row {
  display: flex;
  gap: 2px;
}
.tool-switch-row .dropdown-item {
  flex: 1;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.panel-color-grid {
  display: grid;
  grid-template-columns: repeat(5, auto);
  gap: 10px;
  padding: 8px 10px;
  justify-content: center;
}

.edit-sub-options {
  padding: 2px 0 4px;
}

.size-row {
  display: grid;
  grid-template-columns: repeat(5, auto);
  gap: 10px;
  padding: 0 10px;
  justify-content: center;
  align-items: center;
}

#toolbar .size-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  border-radius: 4px;
  cursor: pointer;
  width: 14px;
  height: 14px;
  min-width: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: center;
  padding: 0;
  transition: all 0.15s;
}
#toolbar .size-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}
#toolbar .size-btn.active {
  background: var(--active-bg);
  color: var(--accent);
}

#toolbar .color-dot {
  width: 14px;
  height: 14px;
  min-width: 0;
  border-radius: 50%;
  border: none;
  box-shadow: 0 0 0 1.5px rgba(255, 255, 255, 0.15);
  cursor: pointer;
  padding: 0;
  transition: box-shadow 0.15s, transform 0.15s;
  justify-self: center;
  display: block;
}

#toolbar .color-dot:hover {
  box-shadow: 0 0 0 1.5px rgba(255, 255, 255, 0.5);
}

#toolbar .color-dot.active {
  transform: scale(1.35);
}

#toolbar .color-dot[data-color="#ffffff"] {
  box-shadow: 0 0 0 1.5px rgba(0, 0, 0, 0.3);
}
#toolbar .color-dot[data-color="#ffffff"]:hover {
  box-shadow: 0 0 0 1.5px rgba(0, 0, 0, 0.6);
}
#toolbar .color-dot[data-color="#ffffff"].active {
  transform: scale(1.35);
}

/* ============================================================
   Search bar
   ============================================================ */

#search-bar {
  position: fixed;
  z-index: 10001;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px;
  background: var(--toolbar-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  flex-shrink: 0;
  min-width: 120px;
}

#search-bar[hidden] { display: none; }

#search-input {
  flex: 1;
  max-width: 300px;
  background: var(--border);
  border: 1px solid #3a3c42;
  color: var(--text);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
}

#search-input:focus {
  outline: none;
  border-color: var(--accent);
}

#search-count {
  font-size: 12px;
  color: var(--text-muted);
}
#search-count:empty {
  display: none;
}

#search-bar button {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}

#search-bar button:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text);
}


/* ============================================================
   Main area layout
   ============================================================ */

#main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ============================================================
   Sidebar
   ============================================================ */

#sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--toolbar-bg);
  border-right: 1px solid var(--border);
  overflow: hidden;
}

#sidebar.hidden { display: none; }

#sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  padding: 8px 0;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.sidebar-panel {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}
.sidebar-panel::-webkit-scrollbar { width: 6px; }
.sidebar-panel::-webkit-scrollbar-track { background: transparent; }
.sidebar-panel::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
.sidebar-panel::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }

.sidebar-panel.hidden { display: none; }

/* TOC */
#toc-content {
  padding: 8px 4px;
}

.toc-empty {
  padding: 16px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

.toc-list {
  list-style: none;
}

.toc-item {
  display: block;
  width: 100%;
  padding: 5px 8px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.1s;
  text-decoration: none;
}

.toc-item:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text);
}

/* Document list */
#docs-content {
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.docs-empty {
  padding: 16px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

.doc-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px 6px 16px;  /* 左側比 header 多縮進一層，形成父子階層 */
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.1s;
  min-width: 0;
}

.doc-item:hover { background: rgba(255,255,255,0.06); }
.doc-item.dragging { opacity: 0.4; }

.doc-item.active {
  background: rgba(136,159,202,0.12);
}

.doc-item-name {
  flex: 1;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.doc-item.active .doc-item-name { color: var(--accent); }


.doc-item-remove {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
  font-size: 11px;
  opacity: 0;
  transition: opacity 0.1s;
}

.doc-item:hover .doc-item-remove { opacity: 1; }
.doc-item-remove:hover { color: var(--text); background: rgba(255,255,255,0.1); }

.doc-item-badge {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 8px;
  flex-shrink: 0;
  white-space: nowrap;
  margin-left: 4px;
}
.doc-item-badge.pending {
  background: rgba(100, 150, 255, 0.18);
  color: #8bb4ff;
}
.doc-item-badge.warn {
  background: rgba(255, 170, 60, 0.18);
  color: #ffc164;
}

.docs-add-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 7px 8px;
  margin: 0;
  border-radius: 4px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.2;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  transition: all 0.1s;
  user-select: none;
}

.docs-add-btn:hover {
  color: var(--text);
  background: rgba(255,255,255,0.04);
}

/* docsPanel 層級不再顯示外框；drag-over 統一由獨立文件區 / 工作區 section 負責 */

/* ─── Independent docs area ─── */
.indep-area {
  padding: 4px;
  display: flex;
  flex-direction: column;
  border-radius: 5px;
  transition: background 0.1s, outline 0.1s;
}
.indep-area.indep-empty {
  min-height: 120px;
  align-items: center;
  justify-content: center;
  margin-top: 16px;
  margin-bottom: 20px;
}
.indep-area.drag-over {
  outline: 2px dashed var(--accent);
  outline-offset: -2px;
  background: rgba(136,159,202,0.08);
}
.indep-header {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 4px 6px 6px;
  margin-top: 4px;
}
.indep-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ─── Workspace sections ─── */
.ws-section {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
  border-radius: 5px;
}
.ws-divider {
  height: 0;
  margin: 0 0 16px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.ws-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 4px 4px 6px;
  min-width: 0;
}
.ws-name {
  flex: 1;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: text;
  user-select: none;
}
.ws-name:hover { color: var(--text); }
.ws-name-input {
  flex: 1;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text);
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--accent);
  border-radius: 3px;
  padding: 2px 4px;
  outline: none;
  font-family: inherit;
  min-width: 0;
}
.ws-add-file,
.ws-delete {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  border-radius: 3px;
  font-size: 11px;
  opacity: 0;
  transition: opacity 0.1s;
  user-select: none;
}
.ws-section:hover .ws-add-file,
.ws-section:hover .ws-delete { opacity: 0.8; }
.ws-add-file:hover { color: #80d080; background: rgba(100,200,100,0.15); opacity: 1; }
.ws-delete:hover { color: #ff8080; background: rgba(255,100,100,0.15); opacity: 1; }

.ws-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 8px;
  padding: 2px;
  border-radius: 4px;
  transition: background 0.1s, outline 0.1s;
}
.ws-section.drag-over {
  outline: 2px dashed var(--accent);
  outline-offset: -2px;
  background: rgba(136,159,202,0.08);
  border-radius: 5px;
}
.ws-empty-hint {
  padding: 10px 8px;
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}

.ws-create-wrap {
  margin-top: 4px;
}
.ws-create-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: none;
  border: none;
  border-radius: 3px;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 11px;
  font-weight: 400;
  line-height: 1.2;
  opacity: 0.7;
  cursor: pointer;
  transition: all 0.1s;
  user-select: none;
}
.ws-create-btn:hover {
  color: var(--text);
  opacity: 1;
  background: rgba(255,255,255,0.04);
}

/* ============================================================
   Viewer
   ============================================================ */

#viewer {
  flex: 1;
  overflow: auto;
  background: var(--bg);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
  touch-action: pan-x pan-y;  /* 單指捲動正常；雙指 pinch 由 JS 接管 */
  position: relative;
  outline: none;
}
#viewer::-webkit-scrollbar { width: 6px; }
#viewer::-webkit-scrollbar-track { background: transparent; }
#viewer::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
#viewer::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }

#pages-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  gap: 12px;
  min-height: 100%;
  /* Allow container to grow with widest page so horizontal scroll reaches both edges
     when zoomed in; still centers when content fits the viewport. */
  width: fit-content;
  min-width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}

#pages-container.dual-page {
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
}

#pages-container.dual-page .page-wrapper {
  max-width: calc(50% - 16px);
  height: auto;
}

#pages-container.dual-page .page-wrapper canvas {
  width: 100%;
  height: auto;
}

.page-wrapper {
  position: relative;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  background: white;
  line-height: 0;
  flex-shrink: 0;
}

.page-wrapper.placeholder {
  background: #1e2a45;
}

/* ============================================================
   Text layer
   ============================================================ */

.text-layer {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  line-height: 1;
  user-select: text;
  caret-color: transparent;
  z-index: 2;
}

.text-layer span {
  position: absolute;
  white-space: pre;
  color: transparent;
  cursor: text;
  transform-origin: 0% 0%;
}

.text-layer span::selection {
  background: rgba(136, 159, 202, 0.35);
  color: transparent;
}

#viewer.mode-highlight .text-layer span {
  cursor: text;
}
#viewer.mode-highlight .text-layer span::selection {
  background: color-mix(in srgb, var(--hl-color, #FFE066) 50%, transparent);
}

/* Search highlight on text spans */
.text-layer span.search-highlight {
  background: rgba(255, 200, 0, 0.45);
  border-radius: 2px;
}

/* Mode overrides for pointer events */
#viewer.mode-ink .text-layer,
#viewer.mode-note .text-layer,
#viewer.mode-text .text-layer,
#viewer.mode-erase .text-layer {
  pointer-events: none;
}

/* ============================================================
   Highlight layer
   ============================================================ */

.highlight-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.hl-rect {
  position: absolute;
  opacity: 0.25;
  border-radius: 1px;
  pointer-events: none;
  transition: opacity 0.15s;
}

#viewer.mode-erase .highlight-layer {
  pointer-events: auto;
}

#viewer.mode-erase .hl-rect {
  pointer-events: auto;
  cursor: pointer;
}

#viewer.mode-erase .hl-rect:hover {
  opacity: 0.7;
  outline: 2px solid rgba(255, 80, 80, 0.7);
}

/* ============================================================
   Ink canvas
   ============================================================ */

.ink-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
  cursor: crosshair;
}

#viewer.mode-ink .ink-canvas {
  pointer-events: auto;
}

#viewer.mode-erase .ink-canvas {
  pointer-events: auto;
  cursor: cell;
}

/* ============================================================
   Sticky notes
   ============================================================ */

.sticky-note {
  position: absolute;
  z-index: 4;
  width: 160px;
  min-height: 80px;
  background: #fff9c4;
  border: 1px solid #f0d030;
  border-radius: 4px;
  box-shadow: 2px 2px 8px rgba(0,0,0,0.25);
  display: flex;
  flex-direction: column;
  font-size: 12px;
}

.note-header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: #f0d030;
  padding: 2px 4px;
  cursor: move;
  border-radius: 3px 3px 0 0;
  user-select: none;
}

.note-delete {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 11px;
  color: #555;
  padding: 1px 3px;
  border-radius: 2px;
  line-height: 1;
}

.note-delete:hover { background: rgba(0,0,0,0.1); color: #000; }

.note-text {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  padding: 6px;
  font-size: 12px;
  color: #333;
  font-family: inherit;
  outline: none;
  min-height: 60px;
}

/* Drop zone (empty viewer) */
#file-access-banner {
  position: fixed;
  top: 56px;
  left: 50%;
  transform: translateX(-50%);
  background: #2a3a5c;
  border: 1px solid #4a6a9a;
  border-radius: 10px;
  color: #b5c4dd;
  font-size: 13px;
  padding: 10px 14px 10px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 6000;
  max-width: 440px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}
#file-access-banner-close {
  background: none;
  border: none;
  color: #8a9ab4;
  cursor: pointer;
  font-size: 13px;
  padding: 0;
  flex-shrink: 0;
}
#file-access-banner-close:hover { color: #b5c4dd; }

#drop-zone {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg, #1e1f22);
  z-index: 50;
}
#drop-zone[hidden] { display: none; }
#drop-zone.drag-over .drop-zone-inner {
  border-color: var(--accent, #6b82b0);
  background: rgba(107,130,176,0.08);
}
#drop-zone .drop-zone-inner {
  border: 2px dashed rgba(255,255,255,0.2);
  border-radius: 16px;
  padding: 60px 80px;
  text-align: center;
  color: var(--text-muted, #949ba4);
  transition: all 0.2s;
  pointer-events: none;
}
#drop-zone .drop-zone-inner > * { pointer-events: auto; }
#drop-zone .drop-zone-title {
  font-size: 18px;
  margin: 16px 0 8px;
  color: var(--text, #dbdee1);
}
#drop-zone .drop-zone-sub {
  font-size: 13px;
  margin: 0;
}
#drop-zone-pick {
  background: none;
  border: none;
  color: var(--accent, #6b82b0);
  cursor: pointer;
  font: inherit;
  text-decoration: underline;
  padding: 0 4px;
}
.drop-zone-url-row {
  margin-top: 16px;
  width: 100%;
  max-width: 420px;
}
#drop-zone-url-input {
  width: 100%;
  box-sizing: border-box;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  color: var(--text, #dbdee1);
  font-size: 13px;
  padding: 7px 10px;
  outline: none;
  text-align: center;
}
#drop-zone-url-input:focus {
  border-color: var(--accent, #6b82b0);
  background: rgba(255,255,255,0.09);
}
#drop-zone-url-input:disabled {
  opacity: 0.6;
  cursor: default;
}
.drop-zone-url-error {
  color: #e03131;
  font-size: 12px;
  margin: 4px 0 0;
}

/* 文字註解（無背景的便條） */
.sticky-note.text-anno {
  background: transparent;
  border: 1px dashed transparent;
  box-shadow: none;
  width: auto;
  min-width: 60px;
  min-height: 0;
}
.sticky-note.text-anno:hover {
  border-color: rgba(0,0,0,0.25);
}
.sticky-note.text-anno .note-header {
  background: transparent;
  opacity: 0;
  transition: opacity 0.15s;
  padding: 0 2px;
  min-height: 14px;
}
.sticky-note.text-anno:hover .note-header {
  opacity: 1;
}
.sticky-note.text-anno .note-delete {
  color: #333;
}
.sticky-note.text-anno .note-text {
  padding: 2px 4px;
  min-height: 0;
  font-size: 14px;
  color: #111;
  overflow: hidden;
}

/* text-anno colour & size controls */
.text-anno-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.text-anno-color {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1.5px solid transparent;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.text-anno-color.active {
  border-color: rgba(0,0,0,0.45);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.6);
}
.text-anno-sep {
  width: 1px;
  height: 12px;
  background: rgba(0,0,0,0.2);
  margin: 0 2px;
  flex-shrink: 0;
}
.text-anno-size {
  background: none;
  border: none;
  cursor: pointer;
  padding: 1px 3px;
  font-size: 10px;
  font-weight: 600;
  color: #555;
  border-radius: 2px;
  line-height: 1;
}
.text-anno-size.active {
  background: rgba(0,0,0,0.12);
  color: #111;
}
.text-anno-size:hover { background: rgba(0,0,0,0.08); }

/* ============================================================
   Modal (文件屬性)
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 20000;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-overlay.hidden { display: none; }

.modal-box {
  background: var(--toolbar-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  min-width: 320px;
  max-width: 480px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}
.modal-box::-webkit-scrollbar { width: 6px; }
.modal-box::-webkit-scrollbar-track { background: transparent; }
.modal-box::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
.modal-box::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
}
.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.props-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.props-table td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
}
.props-table td:first-child {
  color: var(--text-muted);
  white-space: nowrap;
  width: 90px;
}

/* ============================================================
   Print
   ============================================================ */

@media print {
  #toolbar, #search-bar, #sidebar, #chat-sidebar, .sticky-note .note-delete { display: none !important; }
  body { overflow: visible; height: auto; }
  #main-area { overflow: visible; }
  #viewer { overflow: visible; }
  #pages-container { padding: 0; gap: 0; }
  .page-wrapper { box-shadow: none; page-break-after: always; }
}

/* ============================================================
   Chat Sidebar
   ============================================================ */

#chat-sidebar {
  width: 380px;
  min-width: 280px;
  max-width: 60vw;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--toolbar-bg);
  border-left: 1px solid var(--border);
  overflow: hidden;
  position: relative;
  font-family: 'gg sans', 'Noto Sans TC', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR',
               'PingFang TC', 'PingFang SC', 'Microsoft JhengHei', 'Microsoft YaHei',
               'Hiragino Sans', 'Yu Gothic', 'Malgun Gothic',
               -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  container-type: inline-size;
}
#chat-sidebar.hidden { display: none; }

/* Resize handle on the left edge */
#chat-resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  cursor: col-resize;
  z-index: 1100;  /* above .chat-setup-overlay (1000) so it stays draggable */
  background: transparent;
  transition: background 0.15s;
}
#chat-resize-handle:hover,
#chat-resize-handle.dragging {
  background: var(--accent);
}

/* Chat topbar */
#chat-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 10px;
  background: var(--toolbar-bg);
  flex-shrink: 0;
  position: relative;
}

#chat-topbar-left {
  min-width: 0;
  overflow: visible;
  flex: 1;
  position: relative;
}

#chat-topbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
  margin-left: 8px;
}

#chat-model-label {
  font-size: 14px;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 7px 14px;
  border-radius: 20px;
  max-width: 100%;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  text-align: left;
  transition: all 0.15s;
}
#chat-model-label .chat-model-label-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
#chat-model-label .chat-model-chevron {
  flex-shrink: 0;
  opacity: 0.7;
}

#chat-index-status {
  display: block;
  flex-shrink: 0;
  font-size: 0.85rem;
  color: #b5bac1;
  padding: 10px 14px;
  background: transparent;
  border: 1px dashed #4e5058;
  border-radius: 8px;
  margin: 4px 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#chat-index-status[hidden] { display: none; }
#chat-index-status.building {
  color: #b5bac1;
}
#chat-index-status.error {
  color: #e89797;
  border-color: rgba(220,80,80,0.5);
}
#chat-model-label:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text);
}

.chat-model-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: var(--toolbar-bg, #2a2a2a);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  z-index: 100;
  min-width: 200px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.chat-model-dropdown[hidden] {
  display: none;
}
.chat-model-item {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 4px;
  text-align: left;
  font-size: 13px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 220px;
}
.chat-model-item .chat-model-name {
  flex: 1;
}
.chat-model-item:hover {
  background: rgba(255,255,255,0.08);
}
.chat-model-item.active {
  background: rgba(255,255,255,0.12);
  color: var(--accent, #6b82b0);
}
.chat-model-divider {
  height: 1px;
  background: rgba(255,255,255,0.08);
  margin: 4px 8px;
}
.chat-model-empty {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-muted);
  opacity: 0.7;
  text-align: center;
}

/* Tier badges — 單一色系，三階亮度表示模型強弱 */
.tier-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 10px;
  letter-spacing: 0.3px;
  flex-shrink: 0;
  line-height: 1.4;
}
.tier-badge.tier-fast {
  background: rgba(255,255,255,0.05);
  color: rgba(219,222,225,0.55);
}
.tier-badge.tier-balanced {
  background: rgba(255,255,255,0.08);
  color: rgba(219,222,225,0.80);
}
.tier-badge.tier-advanced {
  background: rgba(255,255,255,0.12);
  color: rgba(219,222,225,1.00);
}

#chat-sidebar .icon-btn,
#chat-settings-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  transition: all 0.15s;
}
#chat-sidebar .icon-btn:hover,
#chat-settings-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text);
}

/* Chat panel layout */
#chat-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  padding-bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
  will-change: transform;  /* 保持 GPU 合成層，消除首次捲動的提升延遲 */
  -webkit-mask-image: linear-gradient(to bottom, black calc(100% - 40px), transparent 100%);
  mask-image: linear-gradient(to bottom, black calc(100% - 40px), transparent 100%);
}
#chat-messages::-webkit-scrollbar { width: 6px; }
#chat-messages::-webkit-scrollbar-track { background: transparent; }
#chat-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
#chat-messages::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }

/* Messages */
#chat-sidebar .message {
  display: flex;
  flex-direction: column;
  max-width: 95%;
  animation: chatFadeIn 0.2s ease;
}
@keyframes chatFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
#chat-sidebar .message.user { align-self: flex-end; position: relative; }
#chat-sidebar .message.assistant {
  align-self: flex-start;
  align-items: flex-start;
  gap: 0;
}

#chat-sidebar .message-content {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.6;
  word-break: break-word;
  overflow-wrap: anywhere;
  min-width: 0;
}
#chat-sidebar .message-content .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0;
}
#chat-sidebar .message-content .katex {
  font-size: 1.2em;
}
#chat-sidebar .message.user .message-content {
  background: #383a40;
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-right-radius: 2px;
}
#chat-sidebar .message.assistant .message-content {
  background: none;
  color: var(--text);
  border: none;
  padding: 4px 0;
}
#chat-sidebar .message-content p { margin: 0 0 8px; }
#chat-sidebar .message-content p:last-child { margin-bottom: 0; }
#chat-sidebar .message-content strong { color: #889fca; font-weight: 600; }
#chat-sidebar .message-content a.page-ref {
  color: #889fca;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  font-weight: 500;
}
#chat-sidebar .message-content a.page-ref:hover {
  color: #b5c4dd;
  background: rgba(136,159,202,0.12);
  border-radius: 3px;
}
#chat-sidebar .message-content code {
  background: rgba(0,0,0,0.3);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: 'Cascadia Code', 'Fira Code', monospace;
  font-size: 15px;
}
#chat-sidebar .message-content pre {
  background: rgba(0,0,0,0.3);
  padding: 10px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 8px 0;
}
#chat-sidebar .message-content pre code { background: none; padding: 0; }
#chat-sidebar .message-content ul, #chat-sidebar .message-content ol { padding-left: 20px; margin: 0 0 6px; }
#chat-sidebar .message-content li { margin: 3px 0; }
#chat-sidebar .message-content blockquote {
  border-left: 3px solid #889fca;
  padding-left: 12px;
  margin: 8px 0;
  color: #b5bac1;
}
#chat-sidebar .message-content table { border-collapse: collapse; width: 100%; margin: 8px 0; font-size: 13px; }
#chat-sidebar .message-content th, #chat-sidebar .message-content td {
  border: 1px solid #4e5058;
  padding: 6px 10px;
  text-align: left;
}
#chat-sidebar .message-content th { background: var(--border); font-weight: 600; color: #b5bac1; }

#chat-sidebar .message-context {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
  padding: 0 4px;
}
#chat-sidebar .message.user .message-context { text-align: right; }
#chat-sidebar .message.system .message-content {
  font-size: 0.85rem;
  color: #b5bac1;
  background: transparent;
  border: 1px dashed #4e5058;
}
#chat-sidebar .message.system.dismissing {
  animation: sysMsgFadeOut 0.35s ease forwards;
  pointer-events: none;
}
@keyframes sysMsgFadeOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-6px); }
}
#chat-sidebar .error-text { color: #f04747; }
#chat-sidebar .message-content hr {
  border: none;
  border-top: 1px solid #3a3c42;
  margin: 8px 0;
}

/* Copy button */
#chat-sidebar .copy-msg-btn {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 3px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.15s;
  border-radius: 4px;
}
/* user: absolute，泡泡左側外，對齊底部 */
#chat-sidebar .message.user .copy-msg-btn {
  position: absolute;
  bottom: 0;
  right: 100%;
}
/* assistant: 在流中，泡泡正下方靠左 */
#chat-sidebar .message.assistant .copy-msg-btn { padding-left: 0; margin-left: -2px; margin-top: -2px; }
#chat-sidebar .message:hover .copy-msg-btn { opacity: 1; }
#chat-sidebar .copy-msg-btn:hover { opacity: 1; }

/* Chat restore notice */
#chat-sidebar .chat-restore-notice {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  padding: 6px 12px;
  opacity: 0.7;
  animation: chatFadeOut 0.5s ease 3.5s forwards;
}
@keyframes chatFadeOut {
  from { opacity: 0.7; }
  to { opacity: 0; }
}

/* Selected text preview */
#chat-selected-preview {
  margin: 0 12px 6px;
  padding: 7px 10px 7px 12px;
  background: rgba(136, 159, 202, 0.15);
  border-left: 2px solid #889fca;
  border-radius: 0 6px 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
#chat-selected-preview[hidden] { display: none; }

#chat-sidebar .preview-body {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
#chat-sidebar .preview-label {
  font-size: 10px;
  font-weight: 700;
  color: #889fca;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  line-height: 1;
}
#chat-selected-content {
  font-size: 12px;
  color: #b5bac1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  line-height: 1.4;
}
#chat-clear-selection {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  flex-shrink: 0;
}
#chat-clear-selection:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text);
}

/* Quick prompts */
/* Chat input — pill bar */
#chat-input-area {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 9px 10px;
  flex-shrink: 0;
  background: var(--border);
  border: 1px solid #3a3c42;
  border-radius: 22px;
  margin: 0 12px 12px;
}

/* Multi-line: textarea wraps to full width, buttons below */
#chat-input-area.multiline {
  align-items: flex-end;
  flex-wrap: wrap;
  padding: 10px 10px 8px;
  gap: 0;
}
#chat-input-area.multiline #chat-input {
  order: 1;
  flex-basis: 100%;
  padding-bottom: 8px;
}
#chat-input-area.multiline #chat-plus-wrap { order: 2; }
#chat-input-area.multiline #chat-send-btn {
  order: 3;
  margin-left: auto;
}

/* + button wrap (relative anchor for dropdown) */
#chat-plus-wrap {
  position: relative;
  flex-shrink: 0;
}
#chat-plus-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  padding: 0;
  transition: color 0.15s, background 0.15s;
}
#chat-plus-btn:hover:not(:disabled) { color: var(--text); background: rgba(255,255,255,0.08); }
#chat-plus-btn:disabled { opacity: 0.35; cursor: default; }

/* Quick-prompt dropdown */
#chat-quick-prompts {
  position: absolute;
  bottom: calc(100% + 8px);
  left: -4px;
  background: var(--toolbar-bg);
  border: 1px solid #4e5058;
  border-radius: 10px;
  padding: 4px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 150px;
  z-index: 200;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
#chat-quick-prompts[hidden] { display: none; }
#chat-sidebar .quick-prompt-btn {
  background: none;
  border: none;
  border-radius: 6px;
  color: #b5bac1;
  font-size: 13px;
  padding: 7px 10px;
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
  white-space: nowrap;
  text-align: left;
  width: 100%;
}
#chat-sidebar .quick-prompt-btn:hover:not(:disabled) {
  background: rgba(255,255,255,0.08);
  color: var(--text);
}
#chat-sidebar .quick-prompt-btn:disabled { opacity: 0.35; cursor: default; }

/* Textarea */
#chat-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  padding: 5px 4px;
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  max-height: 120px;
  overflow-y: auto;
  scrollbar-width: none;
  font-family: inherit;
  -webkit-appearance: none;
}
#chat-input::-webkit-scrollbar { display: none; }
#chat-input:focus { outline: none; }
#chat-input::placeholder { color: rgba(255,255,255,0.22); }

/* Send / stop button — circular, brightness-only */
#chat-send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: rgba(255,255,255,0.12);
  border: none;
  border-radius: 50%;
  color: var(--text);
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, opacity 0.15s;
}
#chat-send-btn:hover:not(:disabled) { background: rgba(255,255,255,0.22); }
#chat-send-btn:disabled { opacity: 0.3; cursor: default; }

/* Typing indicator */
#chat-sidebar .typing-indicator {
  display: flex;
  gap: 4px;
  padding: 4px 0;
}
#chat-sidebar .typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: chatBounce 1.2s infinite;
}
#chat-sidebar .typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
#chat-sidebar .typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes chatBounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* Settings overlay */
.chat-setup-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.chat-setup-overlay[hidden] { display: none; }

#chat-sidebar .setup-card {
  position: relative;
  background: var(--toolbar-bg);
  border: 1px solid #4e5058;
  border-radius: 12px;
  padding: 2rem;
  max-width: 360px;
  width: 90%;
  max-height: calc(100% - 40px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}
#chat-sidebar .setup-card::-webkit-scrollbar { width: 6px; }
#chat-sidebar .setup-card::-webkit-scrollbar-track { background: transparent; }
#chat-sidebar .setup-card::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
#chat-sidebar .setup-card::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }
#chat-sidebar .setup-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  line-height: 1;
}
#chat-sidebar .setup-close:hover { color: var(--text); background: rgba(255,255,255,0.08); }
#chat-sidebar .setup-card h2 { margin: 0 0 1rem; color: var(--text); font-size: 1.1rem; }
#chat-sidebar .setup-label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}
#chat-sidebar .setup-select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  background: var(--toolbar-bg, #2a2a2a);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  padding: 10px 36px 10px 14px;
  color: var(--text);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  cursor: pointer;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23949ba4' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 14px;
}
#chat-sidebar .setup-select:hover { border-color: rgba(255,255,255,0.2); }
#chat-sidebar .setup-select:focus { outline: none; border-color: var(--accent, #889fca); }
#chat-sidebar .setup-select option { background: #2a2a2a; color: var(--text); }

/* Custom dropdown matching the chat-model-dropdown style */
#chat-sidebar .setup-dropdown {
  position: relative;
  margin-bottom: 1rem;
}
#chat-sidebar .setup-dropdown-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--toolbar-bg, #2a2a2a);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  padding: 10px 14px;
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: border-color 0.15s;
}
#chat-sidebar .setup-dropdown-btn:hover { border-color: rgba(255,255,255,0.2); }
#chat-sidebar .setup-dropdown-btn .setup-dropdown-chevron {
  flex-shrink: 0;
  opacity: 0.7;
  margin-left: 8px;
  transition: transform 0.15s;
}
/* 語言選擇彈窗 */
#chat-lang-modal .lang-picker-card {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: calc(100% - 32px);
  max-height: 70%;
  background: var(--toolbar-bg, #2a2a2a);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
#chat-lang-modal .lang-picker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 14px 10px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}
#chat-lang-modal .lang-picker-list {
  overflow-y: auto;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
#chat-sidebar .setup-dropdown-item {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 10px 14px;
  border-radius: 10px;
  text-align: left;
  font-size: 0.9rem;
  font-family: inherit;
  width: 100%;
}
#chat-sidebar .setup-dropdown-item:hover { background: rgba(255,255,255,0.08); }
#chat-sidebar .setup-dropdown-item.active {
  background: rgba(255,255,255,0.12);
  color: var(--accent, #889fca);
}
#chat-sidebar .setup-row {
  display: flex;
  gap: 6px;
  margin-bottom: 0.25rem;
}
#chat-sidebar .setup-row input {
  flex: 1;
  min-width: 0;
  background: var(--border);
  border: 1px solid #4e5058;
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  color: var(--text);
  font-size: 0.85rem;
  height: 34px;
  min-height: unset;
  box-sizing: border-box;
}
#chat-sidebar .setup-row input:focus { outline: none; border-color: #889fca; }
#chat-sidebar .setup-hint { font-size: 0.75rem !important; color: rgba(148,155,164,0.7); margin: 4px 0 0; line-height: 1.45; }
#chat-sidebar .setup-hint:empty { display: none; }
#chat-sidebar .setup-toggle {
  display: flex !important;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  margin-top: 16px !important;
}
#chat-sidebar .setup-toggle input { margin: 0; cursor: pointer; }
/* Google 登入佔位按鈕 */
#chat-sidebar .google-signin-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: #1f1f1f;
  color: #e3e3e3;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
#chat-sidebar .google-signin-btn:hover {
  background: #2a2a2b;
  border-color: rgba(255,255,255,0.22);
}
#chat-sidebar .setup-signin-hint {
  font-size: 0.75rem !important;
  color: var(--text-muted);
  text-align: center;
  margin: 6px 0 1.25rem;
  opacity: 0.8;
}
#chat-sidebar .backend-user-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 1rem;
}
#chat-sidebar .backend-user-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: #e3e5e8;
}
#chat-sidebar .backend-user-plan {
  font-size: 0.75rem;
  color: #7289da;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
#chat-sidebar .backend-user-usage {
  font-size: 0.75rem;
  color: var(--text-muted);
}
#chat-sidebar .backend-upgrade-row {
  display: flex;
  gap: 6px;
  margin-top: 2px;
}
#chat-sidebar .backend-upgrade-btn {
  flex: 1;
  padding: 6px 10px;
  border-radius: 7px;
  border: 1px solid rgba(114,137,218,0.5);
  background: rgba(114,137,218,0.12);
  color: #7289da;
  font-size: 0.78rem;
  cursor: pointer;
  transition: background 0.15s;
  text-align: center;
}
#chat-sidebar .backend-upgrade-btn:hover:not(:disabled) {
  background: rgba(114,137,218,0.25);
}
#chat-sidebar .backend-upgrade-btn:disabled {
  opacity: 0.5;
  cursor: default;
}
#chat-sidebar .backend-upgrade-btn--full {
  flex: unset;
  width: 100%;
}
#chat-sidebar #chat-backend-logout {
  display: flex;
  width: 100%;
  justify-content: center;
  text-align: center;
}
#chat-sidebar .backend-quota-warn {
  font-size: 0.72rem;
  color: #f0b232;
  margin-top: 2px;
}
#chat-sidebar .backend-expired-msg {
  font-size: 0.72rem;
  color: #f04747;
  margin-top: 4px;
}

/* 進階功能折疊區 */
#chat-sidebar .setup-advanced {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 10px 0 0;
  margin-top: 1rem;
}
#chat-sidebar .setup-advanced-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
  padding: 4px 2px;
  text-align: left;
}
#chat-sidebar .setup-advanced-toggle:hover { color: var(--text); }
#chat-sidebar .setup-advanced-toggle .setup-advanced-chevron {
  flex-shrink: 0;
  opacity: 0.7;
  transition: transform 0.15s;
}
#chat-sidebar .setup-advanced-toggle.open .setup-advanced-chevron {
  transform: rotate(90deg);
}
#chat-sidebar .setup-advanced-body {
  padding: 12px 2px 2px;
}
#chat-sidebar .setup-advanced-body .setup-feature-row {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
#chat-sidebar .setup-advanced-body.collapsed {
  display: none;
}

#chat-sidebar .setup-rebuild-row {
  display: flex !important;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}
#chat-sidebar .setup-inline-hint {
  font-size: 11px;
  color: var(--text-muted, #949ba4);
  line-height: 1.4;
  flex: 1;
}
#chat-sidebar .setup-secondary {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text-secondary);
  height: 34px;
  padding: 0 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.78rem;
  margin-top: 0;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  box-sizing: border-box;
}
.setup-row #chat-save-key {
  margin-top: 0;
}
#chat-sidebar .setup-secondary:hover { background: rgba(255,255,255,0.12); color: var(--text); }
#chat-sidebar .setup-secondary.danger {
  border-color: rgba(255,255,255,0.08);
  color: var(--text-muted);
}
#chat-sidebar .setup-secondary.danger:hover { background: rgba(255,255,255,0.12); color: var(--text-secondary); }
#chat-sidebar .setup-feature-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 0;
}
#chat-sidebar .setup-feature-row .setup-label {
  margin-bottom: 0;
}
#chat-sidebar .setup-feature-row .setup-secondary { margin-top: 0; }

#chat-sidebar .storage-card {
  max-width: 95%;
  width: 95%;
}
#chat-sidebar .storage-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 12px 0;
}
#chat-sidebar .storage-summary span {
  font-size: 12px;
  color: var(--text-muted);
}
#chat-sidebar .storage-list {
  max-height: 50vh;
  overflow-y: auto;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  padding: 4px;
  background: rgba(0,0,0,0.15);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}
#chat-sidebar .storage-list::-webkit-scrollbar { width: 6px; }
#chat-sidebar .storage-list::-webkit-scrollbar-track { background: transparent; }
#chat-sidebar .storage-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
#chat-sidebar .storage-list::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }
#chat-sidebar .storage-empty {
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}
#chat-sidebar .storage-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 10px;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
#chat-sidebar .storage-row:last-child { border-bottom: none; }
#chat-sidebar .storage-row:hover { background: rgba(255,255,255,0.04); }
#chat-sidebar .storage-row .row-name {
  color: var(--text);
  word-break: break-word;
  font-weight: 500;
}
#chat-sidebar .storage-row .row-meta {
  grid-column: 1 / 2;
  color: var(--text-muted);
  font-size: 11px;
}
#chat-sidebar .storage-row .row-meta .row-badges {
  margin-bottom: 2px;
}
#chat-sidebar .storage-row .row-meta .badge {
  display: inline-block;
  padding: 1px 6px;
  margin-right: 4px;
  border-radius: 10px;
  background: rgba(107,130,176,0.15);
  color: #b5c4dd;
  font-size: 10px;
}
#chat-sidebar .row-delete {
  background: none;
  border: 1px solid rgba(220,80,80,0.4);
  color: #e89797;
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 11px;
  white-space: nowrap;
}
#chat-sidebar .row-delete:hover { background: rgba(220,80,80,0.18); }
#chat-sidebar .storage-row .row-delete {
  grid-row: 1 / 3;
  grid-column: 2;
  align-self: start;
}

/* Workspace-oriented storage panel */
#chat-sidebar .storage-ws-row {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
#chat-sidebar .storage-ws-row:last-child { border-bottom: none; }
#chat-sidebar .storage-ws-header {
  display: grid;
  grid-template-columns: 14px 1fr auto auto;
  gap: 8px;
  align-items: center;
  padding: 10px 8px;
  cursor: pointer;
  transition: background 0.1s;
}
#chat-sidebar .storage-ws-header:hover { background: rgba(255,255,255,0.04); }
#chat-sidebar .storage-ws-caret {
  font-size: 10px;
  color: var(--text-muted);
  user-select: none;
}
#chat-sidebar .storage-ws-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#chat-sidebar .storage-ws-meta {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}
#chat-sidebar .storage-ws-details {
  padding: 0 8px 8px 30px;
  background: rgba(0,0,0,0.15);
}
#chat-sidebar .storage-doc-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  padding: 8px 0;
  font-size: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
#chat-sidebar .storage-doc-row:last-child { border-bottom: none; }
#chat-sidebar .storage-doc-name {
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
  font-weight: 500;
}
#chat-sidebar .storage-doc-badges {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}
#chat-sidebar .storage-badge {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 10px;
  font-size: 10px;
  white-space: nowrap;
}
#chat-sidebar .storage-badge-idx,
#chat-sidebar .storage-badge-ann,
#chat-sidebar .storage-badge-chat {
  background: rgba(255,255,255,0.08);
  color: var(--text-muted);
}
#chat-sidebar .storage-doc-meta {
  color: var(--text-muted);
  white-space: nowrap;
  font-size: 11px;
}
#chat-sidebar .storage-section-header {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  padding: 14px 8px 6px;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 6px;
}
#chat-sidebar .storage-ws-header-row {
  cursor: pointer;
  border-bottom: none;
}
#chat-sidebar .storage-ws-header-row:hover { background: rgba(255,255,255,0.04); }
#chat-sidebar .setup-hint a { color: #889fca; }
#chat-sidebar .cli-setup-guide {
  margin-top: 6px;
}
#chat-sidebar .cli-setup-guide summary {
  font-size: 0.75rem;
  color: rgba(148,155,164,0.7);
  padding: 2px 0;
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
}
#chat-sidebar .cli-setup-guide summary::-webkit-details-marker { display: none; }
#chat-sidebar .cli-setup-guide summary::before {
  content: '▶';
  font-size: 0.55rem;
  transition: transform 0.15s;
}
#chat-sidebar .cli-setup-guide[open] summary::before { transform: rotate(90deg); }
#chat-sidebar .cli-setup-steps {
  margin: 4px 0 0 0;
  padding: 0 0 0 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  counter-reset: cli-step;
}
#chat-sidebar .cli-setup-steps li {
  font-size: 0.73rem;
  color: rgba(148,155,164,0.7);
  line-height: 1.4;
  display: flex;
  flex-direction: column;
  gap: 3px;
  counter-increment: cli-step;
  padding-left: 14px;
  position: relative;
}
#chat-sidebar .cli-setup-steps li::before {
  content: counter(cli-step) '.';
  position: absolute;
  left: 0;
  color: rgba(148,155,164,0.45);
  font-size: 0.7rem;
}
#chat-sidebar .cli-setup-steps code {
  font-family: 'Consolas', 'Menlo', monospace;
  font-size: 0.7rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 4px;
  padding: 2px 6px;
  color: rgba(148,155,164,0.85);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
  max-width: 100%;
  box-sizing: border-box;
}
#chat-sidebar .cli-download-btn {
  font-size: 0.7rem;
  color: rgba(148,155,164,0.7);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 4px;
  padding: 2px 8px;
  text-decoration: none;
  cursor: pointer;
  width: fit-content;
  display: inline-block;
  font-family: inherit;
}
#chat-sidebar .cli-download-btn:hover { background: rgba(255,255,255,0.09); color: var(--text-muted); }
#chat-sidebar #cli-test-btn {
  height: 26px;
  font-size: 0.72rem;
  padding: 0 10px;
  align-self: flex-start;
}
#chat-sidebar .cli-test-result {
  font-size: 0.7rem;
  color: rgba(148,155,164,0.7);
  margin-top: 1px;
}
#chat-sidebar .cli-test-result.ok { color: rgba(148,155,164,0.9); }
#chat-sidebar .cli-test-result.fail { color: rgba(148,155,164,0.7); }
#chat-sidebar .btn-primary {
  background: #889fca;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}
#chat-sidebar .btn-primary:hover { background: #728dbd; }

/* ============================================================
   Toast 錯誤/提示 UI
   ============================================================ */
#toast-container {
  position: fixed;
  top: 56px;
  right: 16px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: min(380px, calc(100vw - 32px));
}
.toast {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #2b2d31;
  color: #dbdee1;
  font-size: 13px;
  line-height: 1.5;
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  border-left: 3px solid #889fca;
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.toast.show { opacity: 1; transform: translateX(0); }
.toast-info    { border-left-color: #889fca; }
.toast-success { border-left-color: #4ade80; }
.toast-warn    { border-left-color: #fab005; }
.toast-error   { border-left-color: #ef4444; }
.toast-msg {
  flex: 1;
  white-space: pre-wrap;
  word-break: break-word;
}
.toast-action {
  background: transparent;
  color: #889fca;
  border: 1px solid rgba(136,159,202,0.4);
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 12px;
  cursor: pointer;
  flex-shrink: 0;
}
.toast-action:hover { background: rgba(136,159,202,0.12); }
.toast-close {
  background: transparent;
  border: none;
  color: #949ba4;
  cursor: pointer;
  font-size: 14px;
  padding: 0 2px;
  line-height: 1;
  flex-shrink: 0;
}
.toast-close:hover { color: #dbdee1; }