修改换行逻辑和段落查看方式

.tmp_itemPane.scss

@@ -1,36 +0,0 @@
-item-pane {
-	flex-grow: 0;
-	flex-shrink: 1;
-	min-width: var(--width-available-item-pane, $min-width-item-pane + $width-sidenav);
-	min-height: $min-width-item-pane + $width-sidenav;
-
-	&[collapsed] {
-		min-width: $width-sidenav;
-		min-height: $width-sidenav;
-		max-width: $width-sidenav;
-
-		visibility: inherit;
-
-		&.stacked {
-			max-width: unset;
-			max-height: $width-sidenav;
-		}
-
-		#zotero-item-pane-content {
-			visibility: collapse;
-		}
-	}
-
-	&.stacked {
-		flex-direction: column;
-		height: 0px;
-
-		#zotero-item-pane-content {
-			width: 100%;
-		}
-	}
-	
-	#batch-edit-prompt-message {
-		padding: 3px 8px;
-	}
-}

.tmp_itemPaneCustomSection.scss

@@ -1,45 +0,0 @@
-item-pane-custom-section {
-	display: flex;
-	flex-direction: column;
-
-	&[hidden] {
-		display: none;
-	}
-	
-	.body {
-		display: flex;
-		flex-direction: column;
-		margin: 0;
-	}
-
-	collapsible-section {
-		&[custom] > .head {
-			& .title::before {
-				content: '';
-				width: 16px;
-				height: 16px;
-				-moz-context-properties: fill, fill-opacity, stroke, stroke-opacity;
-				fill: currentColor;
-				stroke: currentColor;
-		
-				@media (prefers-color-scheme: light) {
-					background: var(--custom-section-icon-light) no-repeat center;
-				}
-				@media (prefers-color-scheme: dark) {
-					background: var(--custom-section-icon-dark) no-repeat center;
-				}
-			}
-	
-			toolbarbutton.section-custom-button {
-				fill: currentColor;
-				-moz-context-properties: fill, fill-opacity;
-				@media (prefers-color-scheme: light) {
-					list-style-image: var(--custom-button-icon-light)
-				}
-				@media (prefers-color-scheme: dark) {
-					list-style-image: var(--custom-button-icon-dark)
-				}
-			}
-		}
-	}
-}

addon/content/chatpapers.css

@@ -16,19 +16,20 @@
 
 /*
  * Item pane section header buttons (open in window, adaptive height).
- * Lucide-style icons are stroke-based (context-stroke); Zotero only enables
+ * Icons use fill="context-fill" like native Zotero toolbar SVGs.
- * fill context on .section-custom-button by default, so strokes stay invisible
- * in light and dark themes until stroke is wired to currentColor.
  */
+collapsible-section[custom][data-pane="chatpapers-chat"] > .head toolbarbutton.section-custom-button,
+collapsible-section[custom][data-pane="chatpapers-lecture"] > .head toolbarbutton.section-custom-button,
 collapsible-section.chatpapers-adaptive-height > .head toolbarbutton.section-custom-button,
 collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom-button {
-  -moz-context-properties: fill, fill-opacity, stroke, stroke-opacity;
+  -moz-context-properties: fill, fill-opacity;
   fill: currentColor;
-  stroke: currentColor;
   color: inherit;
 }
 
 @media (prefers-color-scheme: light) {
+  collapsible-section[custom][data-pane="chatpapers-chat"] > .head toolbarbutton.section-custom-button,
+  collapsible-section[custom][data-pane="chatpapers-lecture"] > .head toolbarbutton.section-custom-button,
   collapsible-section.chatpapers-adaptive-height > .head toolbarbutton.section-custom-button,
   collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom-button {
     list-style-image: var(--custom-button-icon-light);
@@ -36,6 +37,8 @@ collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom
 }
 
 @media (prefers-color-scheme: dark) {
+  collapsible-section[custom][data-pane="chatpapers-chat"] > .head toolbarbutton.section-custom-button,
+  collapsible-section[custom][data-pane="chatpapers-lecture"] > .head toolbarbutton.section-custom-button,
   collapsible-section.chatpapers-adaptive-height > .head toolbarbutton.section-custom-button,
   collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom-button {
     list-style-image: var(--custom-button-icon-dark);
@@ -75,7 +78,7 @@ collapsible-section[open] > :not(.head) .chatpapers-root {
 }
 
 collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
-  min-height: 180px;
+  min-height: 320px;
 }
 
 .chatpapers-header {
@@ -824,6 +827,46 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
 /* --- Voice lecture pane --- */
 .chatpapers-lecture-root {
   gap: 10px;
+  max-width: 100%;
+  min-width: 0;
+}
+
+.chatpapers-lecture-beat-list {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  width: 100%;
+  min-height: 150px;
+  max-height: min(260px, 34vh);
+  max-width: 100%;
+  min-width: 0;
+  box-sizing: border-box;
+}
+
+.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y,
+.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y {
+  overflow-x: hidden;
+  overflow-y: auto;
+  scrollbar-width: thin;
+  scrollbar-color: color-mix(in srgb, currentColor 32%, transparent) transparent;
+  scrollbar-gutter: stable;
+}
+
+.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y::-webkit-scrollbar,
+.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y::-webkit-scrollbar {
+  width: 5px;
+  height: 5px;
+}
+
+.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y::-webkit-scrollbar-thumb,
+.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y::-webkit-scrollbar-thumb {
+  background: color-mix(in srgb, currentColor 28%, transparent);
+  border-radius: 999px;
+}
+
+.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y::-webkit-scrollbar-track,
+.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y::-webkit-scrollbar-track {
+  background: transparent;
 }
 
 .chatpapers-lecture-empty {
@@ -1015,7 +1058,7 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
   outline: 1px solid rgba(31, 122, 140, 0.35);
 }
 
-.chatpapers-lecture-sentence-item .chatpapers-lecture-beat-title {
+.chatpapers-lecture-sentence-item .chatpapers-lecture-beat-preview {
   font-size: 11px;
 }
 
@@ -1032,12 +1075,21 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
 }
 
 .chatpapers-lecture-sentence-chip {
+  appearance: none;
+  width: 100%;
+  box-sizing: border-box;
+  text-align: left;
   padding: 4px 8px;
   border-radius: 6px;
   border: 1px solid color-mix(in srgb, #1f7a8c 20%, transparent);
+  background: transparent;
   cursor: pointer;
+  font: inherit;
   font-size: 11px;
   line-height: 1.35;
+  color: inherit;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 
 .chatpapers-lecture-sentence-chip.is-active {
@@ -1062,8 +1114,54 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
   border: 1px solid color-mix(in srgb, #1f7a8c 15%, transparent);
   font-size: 12px;
   line-height: 1.45;
-  max-height: 200px;
+  max-width: 100%;
-  overflow-y: auto;
+  min-width: 0;
+  box-sizing: border-box;
+}
+
+.chatpapers-lecture-para-detail:not(.is-empty) {
+  min-height: 140px;
+  max-height: min(300px, 38vh);
+}
+
+.chatpapers-lecture-para-detail.is-empty {
+  min-height: auto;
+  max-height: none;
+  overflow: visible;
+}
+
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-original,
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-translation,
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-context,
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-role,
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-kind,
+.chatpapers-lecture-para-detail .chatpapers-lecture-pdf-sync-hint {
+  white-space: pre-wrap;
+  word-break: break-word;
+  overflow-wrap: break-word;
+  overflow-x: hidden;
+  max-width: 100%;
+  font-size: 12px;
+  line-height: 1.55;
+}
+
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-original-label,
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-translation-label,
+.chatpapers-lecture-para-detail .chatpapers-lecture-para-context-label {
+  white-space: normal;
+}
+
+.chatpapers-lecture-para-detail-empty {
+  opacity: 0.72;
+  font-size: 12px;
+  line-height: 1.45;
+  text-align: center;
+  padding: 8px 4px;
+}
+
+.chatpapers-lecture-para-play-btn {
+  align-self: flex-start;
+  margin-bottom: 2px;
 }
 
 .chatpapers-lecture-selection-explain {
@@ -1135,6 +1233,10 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
   flex-direction: column;
   gap: 8px;
   margin-top: 4px;
+  width: 100%;
+  max-width: 100%;
+  min-width: 0;
+  box-sizing: border-box;
 }
 
 .chatpapers-lecture-player-title {
@@ -1143,31 +1245,82 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
   opacity: 0.85;
 }
 
-.chatpapers-lecture-beat-list {
+.chatpapers-lecture-para-list-hint {
-  display: flex;
+  font-size: 11px;
-  flex-direction: column;
+  opacity: 0.68;
-  gap: 4px;
+  line-height: 1.35;
-  max-height: 220px;
-  overflow-y: auto;
 }
 
 .chatpapers-lecture-beat-item {
   display: flex;
-  align-items: center;
+  align-items: stretch;
-  justify-content: space-between;
+  gap: 4px;
-  gap: 8px;
+  width: 100%;
-  padding: 8px 10px;
+  max-width: 100%;
+  min-width: 0;
+  min-height: 40px;
+  box-sizing: border-box;
   border: 1px solid color-mix(in srgb, #1f7a8c 18%, transparent);
   border-radius: 8px;
   background: color-mix(in srgb, #1f7a8c 4%, transparent);
+  overflow: hidden;
+}
+
+.chatpapers-lecture-beat-main {
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 40px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 6px 10px;
+  border: none;
+  background: transparent;
   cursor: pointer;
   text-align: left;
   font: inherit;
+  font-size: 12px;
+  color: inherit;
+  box-sizing: border-box;
+  overflow: hidden;
+}
+
+.chatpapers-lecture-beat-main:hover:not(:disabled) {
+  background: color-mix(in srgb, #1f7a8c 10%, transparent);
+}
+
+.chatpapers-lecture-beat-main:disabled {
+  opacity: 0.55;
+  cursor: default;
+}
+
+.chatpapers-lecture-beat-play {
+  flex-shrink: 0;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 34px;
+  align-self: stretch;
+  border: none;
+  border-left: 1px solid color-mix(in srgb, #1f7a8c 18%, transparent);
+  background: color-mix(in srgb, #1f7a8c 6%, transparent);
+  cursor: pointer;
   color: inherit;
 }
 
-.chatpapers-lecture-beat-item:hover:not(:disabled) {
+.chatpapers-lecture-beat-play:hover:not(:disabled) {
-  background: color-mix(in srgb, #1f7a8c 10%, transparent);
+  background: color-mix(in srgb, #1f7a8c 16%, transparent);
+}
+
+.chatpapers-lecture-beat-play:disabled {
+  opacity: 0.45;
+  cursor: default;
+}
+
+.chatpapers-lecture-beat-item.is-selected {
+  border-color: color-mix(in srgb, #2563eb 45%, transparent);
+  background: color-mix(in srgb, #2563eb 8%, transparent);
 }
 
 .chatpapers-lecture-beat-item.is-active {
@@ -1175,38 +1328,53 @@ collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
   background: color-mix(in srgb, #16a34a 10%, transparent);
 }
 
+.chatpapers-lecture-beat-item.is-selected.is-active {
+  border-color: color-mix(in srgb, #16a34a 50%, transparent);
+  box-shadow: inset 3px 0 0 color-mix(in srgb, #2563eb 70%, transparent);
+}
+
 .chatpapers-lecture-beat-item.is-pending {
   opacity: 0.55;
-  cursor: default;
 }
 
-.chatpapers-lecture-beat-meta {
+.chatpapers-lecture-beat-line {
   display: flex;
-  flex-direction: column;
+  align-items: center;
-  gap: 2px;
+  gap: 8px;
+  flex: 1 1 auto;
   min-width: 0;
+  overflow: hidden;
 }
 
-.chatpapers-lecture-beat-type {
+.chatpapers-lecture-beat-label {
-  font-size: 10px;
+  flex-shrink: 0;
+  font-size: 11px;
   font-weight: 600;
-  opacity: 0.65;
+  line-height: 1.3;
-  text-transform: uppercase;
+  opacity: 0.72;
-  letter-spacing: 0.03em;
+  white-space: nowrap;
 }
 
-.chatpapers-lecture-beat-title {
+.chatpapers-lecture-beat-preview {
+  flex: 1 1 auto;
+  min-width: 0;
   font-size: 12px;
-  line-height: 1.35;
+  line-height: 1.4;
+  white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
-  white-space: nowrap;
 }
 
 .chatpapers-lecture-beat-status {
   flex-shrink: 0;
+  align-self: center;
   font-size: 11px;
+  line-height: 1;
   opacity: 0.7;
+  max-width: 4.5em;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .chatpapers-lecture-player-controls {

addon/content/icons/pane-adaptive-height-fixed.svg

@@ -1,11 +1,7 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="context-stroke" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-  <!-- Lucide: FoldVertical (adaptive off / fixed height) -->
+  <!-- Lucide FoldVertical, filled for Zotero toolbar buttons -->
-  <path d="M12 22v-6"/>
+  <path d="M7.375 2.75h1.25v10.5h-1.25V2.75z" fill="context-fill"/>
-  <path d="M12 8V2"/>
+  <path d="M8 5.25 4.75 2h6.5L8 5.25z" fill="context-fill"/>
-  <path d="M4 12H2"/>
+  <path d="M8 10.75 4.75 14h6.5L8 10.75z" fill="context-fill"/>
-  <path d="M10 12H8"/>
+  <path d="M1.5 7.625h1.25v.75H1.5v-.75zm2.75 0h1.25v.75H4.25v-.75zm5.5 0H11v.75H9.75v-.75zm2.75 0h1.25v.75H13v-.75z" fill="context-fill" fill-opacity="0.82"/>
-  <path d="M16 12h-2"/>
-  <path d="M22 12h-2"/>
-  <path d="m15 19-3-3-3 3"/>
-  <path d="m15 5-3 3-3-3"/>
 </svg>

addon/content/icons/pane-adaptive-height.svg

@@ -1,11 +1,7 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="context-stroke" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-  <!-- Lucide: UnfoldVertical (adaptive on) -->
+  <!-- Lucide UnfoldVertical, filled for Zotero toolbar buttons -->
-  <path d="M12 22v-6"/>
+  <path d="M7.375 2.75h1.25v10.5h-1.25V2.75z" fill="context-fill"/>
-  <path d="M12 8V2"/>
+  <path d="M8 2.75 4.75 6h6.5L8 2.75z" fill="context-fill"/>
-  <path d="M4 12H2"/>
+  <path d="M8 13.25 4.75 10h6.5L8 13.25z" fill="context-fill"/>
-  <path d="M10 12H8"/>
+  <path d="M1.5 7.625h1.25v.75H1.5v-.75zm2.75 0h1.25v.75H4.25v-.75zm5.5 0H11v.75H9.75v-.75zm2.75 0h1.25v.75H13v-.75z" fill="context-fill" fill-opacity="0.82"/>
-  <path d="M16 12h-2"/>
-  <path d="M22 12h-2"/>
-  <path d="m15 19-3 3-3-3"/>
-  <path d="m15 5-3-3-3 3"/>
 </svg>

addon/content/icons/pane-open-window.svg

@@ -1,7 +1,4 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="context-stroke" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-  <!-- Lucide: AppWindow -->
+  <!-- Lucide AppWindow, filled for Zotero toolbar buttons -->
-  <rect x="2" y="4" width="20" height="16" rx="2"/>
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M3 2.5h10a1.5 1.5 0 0 1 1.5 1.5v8.5a1.5 1.5 0 0 1-1.5 1.5H3A1.5 1.5 0 0 1 1.5 12.5V4A1.5 1.5 0 0 1 3 2.5Zm0 2.5v7.5a.5.5 0 0 0 .5.5h9a.5.5 0 0 0 .5-.5V5H3Zm9-2H4a.5.5 0 0 0-.5.5V4.5h9V3a.5.5 0 0 0-.5-.5ZM5.25 2.5h1V4h-1V2.5Z" fill="context-fill"/>
-  <path d="M10 4v4"/>
-  <path d="M2 8h20"/>
-  <path d="M6 4v4"/>
 </svg>

addon/locale/en-US/addon.ftl

@@ -4,10 +4,14 @@ prefs-title = ChatPapers
 
 item-section-chat-head = ChatPapers
 item-section-chat-sidenav = Chat with paper
-item-pane-open-window = Open in separate window
+item-pane-open-window =
-item-pane-adaptive-height = Adaptive height
+    .tooltiptext = Open in separate window
-item-pane-adaptive-height-on = Adaptive height (on)
+item-pane-adaptive-height =
-item-pane-adaptive-height-off = Adaptive height (off)
+    .tooltiptext = Toggle adaptive height
+item-pane-adaptive-height-on =
+    .tooltiptext = Adaptive height (on) — click to use fixed height
+item-pane-adaptive-height-off =
+    .tooltiptext = Fixed height (on) — click to use adaptive height
 
 chat-loading = Loading ChatPapers…
 chat-placeholder = Ask a question about this paper…
@@ -91,6 +95,9 @@ lecture-note-saved = Lecture note saved to Zotero
 lecture-mode-overview = Overview
 lecture-mode-paragraph = Paragraph reading
 lecture-paragraph-list-title = Paper paragraphs (original, then translation)
+lecture-para-list-hint = Click a paragraph for details; click ▶ to play
+lecture-para-detail-empty = Select a paragraph above to view original, translation, and context
+lecture-para-play = Play this part
 lecture-para-label = Para { $n }
 lecture-para-original = Original
 lecture-para-translation = Translation

addon/locale/zh-CN/addon.ftl

@@ -4,10 +4,14 @@ prefs-title = ChatPapers
 
 item-section-chat-head = ChatPapers
 item-section-chat-sidenav = 论文对话
-item-pane-open-window = 在独立窗口中打开
+item-pane-open-window =
-item-pane-adaptive-height = 自适应高度
+    .tooltiptext = 在独立窗口中打开
-item-pane-adaptive-height-on = 自适应高度（已开启）
+item-pane-adaptive-height =
-item-pane-adaptive-height-off = 自适应高度（已关闭）
+    .tooltiptext = 切换自适应高度
+item-pane-adaptive-height-on =
+    .tooltiptext = 自适应高度（已开启）— 点击切换为固定高度
+item-pane-adaptive-height-off =
+    .tooltiptext = 固定高度（已开启）— 点击切换为自适应高度
 
 chat-loading = 正在加载 ChatPapers…
 chat-placeholder = 就这篇论文提问…
@@ -91,6 +95,9 @@ lecture-note-saved = 伴读笔记已写入 Zotero 子笔记
 lecture-mode-overview = 整体讲解
 lecture-mode-paragraph = 逐段精读
 lecture-paragraph-list-title = 论文段落（先读原文，再听译文）
+lecture-para-list-hint = 点击段落查看详情，点击 ▶ 开始朗读
+lecture-para-detail-empty = 点击上方段落查看原文、译文与上下文
+lecture-para-play = 朗读此段
 lecture-para-label = 段落 { $n }
 lecture-para-original = 原文
 lecture-para-translation = 译文 / 讲解

src/hooks.ts

@@ -2,7 +2,7 @@ import { initLocale } from "./utils/locale";
 import { createZToolkit } from "./utils/ztoolkit";
 import { registerLecturePane } from "./modules/lecture/ui/registerLecturePane";
 import { registerSelectionExplainPopup } from "./modules/lecture/ui/registerSelectionExplainPopup";
-import { registerChatPane, registerPrefs } from "./modules/ui/readerPane";
+import { registerChatPane, registerPrefs, ensureChatPapersStyles } from "./modules/ui/readerPane";
 import { registerPrefsScripts } from "./modules/ui/prefs";
 import { registerItemMenus } from "./modules/ui/itemMenu";
 import { registerReaderSelectionHook } from "./modules/pdf/selection";
@@ -30,6 +30,7 @@ async function onStartup() {
 
 async function onMainWindowLoad(win: _ZoteroTypes.MainWindow): Promise<void> {
   addon.data.ztoolkit = createZToolkit();
+  ensureChatPapersStyles(win.document);
   win.MozXULElement.insertFTLIfNeeded(
     `${addon.data.config.addonRef}-mainWindow.ftl`,
   );

src/modules/lecture/ui/lecturePane.ts

@@ -74,6 +74,8 @@ export class LecturePaneView {
   private activeBeatId?: string;
   private activeParagraphId?: string;
   private activeSentenceId?: string;
+  private selectedParagraphId?: string;
+  private selectedSentenceId?: string;
   private pdfSyncEnabled = true;
   private explainingSelection = false;
   private lastSelectionResult?: SelectionExplainResult;
@@ -93,6 +95,7 @@ export class LecturePaneView {
   private modeTabsEl!: HTMLElement;
   private granularityTabsEl!: HTMLElement;
   private beatListEl!: HTMLElement;
+  private paraListHintEl!: HTMLElement;
   private paragraphDetailEl!: HTMLElement;
   private selectionExplainEl!: HTMLElement;
   private playerTitleEl!: HTMLElement;
@@ -199,8 +202,17 @@ export class LecturePaneView {
 
     const playerTitle = this.el("div", "chatpapers-lecture-player-title");
     this.playerTitleEl = playerTitle;
-    this.beatListEl = this.el("div", "chatpapers-lecture-beat-list");
+    this.paraListHintEl = this.el(
-    this.paragraphDetailEl = this.el("div", "chatpapers-lecture-para-detail");
+      "div",
+      "chatpapers-lecture-para-list-hint",
+      getString("lecture-para-list-hint"),
+    );
+    this.paraListHintEl.hidden = true;
+    this.beatListEl = this.el("div", "chatpapers-lecture-beat-list chatpapers-lecture-scroll-y");
+    this.paragraphDetailEl = this.el(
+      "div",
+      "chatpapers-lecture-para-detail chatpapers-lecture-scroll-y",
+    );
     this.selectionExplainEl = this.el("div", "chatpapers-lecture-selection-explain");
     this.selectionExplainEl.hidden = true;
 
@@ -229,6 +241,7 @@ export class LecturePaneView {
       this.modeTabsEl,
       this.granularityTabsEl,
       playerTitle,
+      this.paraListHintEl,
       this.beatListEl,
       this.paragraphDetailEl,
       this.selectionExplainEl,
@@ -537,12 +550,13 @@ export class LecturePaneView {
         this.readGranularity === "sentence"
           ? getString("lecture-sentence-list-title")
           : getString("lecture-paragraph-list-title");
+      this.paraListHintEl.hidden = false;
       this.renderParagraphList(paragraphs);
       this.renderParagraphDetail(
         paragraphs,
-        this.activeParagraphId,
+        this.selectedParagraphId ?? this.activeParagraphId,
         this.paragraphPlayer?.getCurrentKind(),
-        this.activeSentenceId,
+        this.selectedSentenceId ?? this.activeSentenceId,
       );
 
       if (!this.paragraphPlayer) {
@@ -553,6 +567,8 @@ export class LecturePaneView {
           onSegmentChange: (info) => {
             this.activeParagraphId = info.paragraphId;
             this.activeSentenceId = info.sentenceId;
+            this.selectedParagraphId = info.paragraphId;
+            this.selectedSentenceId = info.sentenceId;
             this.renderParagraphList(paragraphs);
             this.renderParagraphDetail(
               paragraphs,
@@ -582,6 +598,7 @@ export class LecturePaneView {
       this.granularityTabsEl.classList.add("is-visible");
     } else if (hasBeats) {
       this.granularityTabsEl.classList.remove("is-visible");
+      this.paraListHintEl.hidden = true;
       this.playerTitleEl.textContent = getString("lecture-beat-list-title");
       this.beatListEl.hidden = false;
       this.paragraphDetailEl.hidden = true;
@@ -633,43 +650,116 @@ export class LecturePaneView {
     if (this.readGranularity === "sentence") {
       for (const para of paragraphs) {
         for (const sentence of para.sentences ?? []) {
-          this.beatListEl.append(this.makeSentenceRow(para, sentence));
+          this.beatListEl.append(this.makeSentenceRow(paragraphs, para, sentence));
         }
       }
       return;
     }
 
     for (const para of paragraphs) {
-      this.beatListEl.append(this.makeParagraphRow(para));
+      this.beatListEl.append(this.makeParagraphRow(paragraphs, para));
     }
   }
 
-  private makeParagraphRow(para: StoredParagraph): HTMLButtonElement {
+  private isParagraphSelected(paraId: string, sentenceId?: string): boolean {
-    const row = this.doc.createElement("button") as HTMLButtonElement;
+    if (this.selectedParagraphId !== paraId) return false;
-    row.type = "button";
+    if (sentenceId) return this.selectedSentenceId === sentenceId;
-    row.className = "chatpapers-lecture-beat-item";
+    return !this.selectedSentenceId;
-    row.dataset.beatId = para.id;
+  }
-    if (para.id === this.activeParagraphId && !this.activeSentenceId) {
-      row.classList.add("is-active");
-    }
-    if (para.ttsZhStatus !== "ready") {
-      row.classList.add("is-pending");
-      row.disabled = para.genStatus !== "ready";
-    }
 
-    const meta = this.el("div", "chatpapers-lecture-beat-meta");
+  private isParagraphPlaying(paraId: string, sentenceId?: string): boolean {
-    const preview = para.originalText.slice(0, 60);
+    if (this.activeParagraphId !== paraId) return false;
-    meta.append(
+    if (sentenceId) return this.activeSentenceId === sentenceId;
+    return !this.activeSentenceId;
+  }
+
+  private selectParagraph(
+    paragraphs: StoredParagraph[],
+    paragraphId: string,
+    sentenceId?: string,
+  ): void {
+    this.selectedParagraphId = paragraphId;
+    this.selectedSentenceId = sentenceId;
+    this.renderParagraphList(paragraphs);
+    this.renderParagraphDetail(paragraphs, paragraphId, undefined, sentenceId);
+
+    const para = paragraphs.find((p) => p.id === paragraphId);
+    if (!para) return;
+    const sentence = sentenceId
+      ? para.sentences?.find((s) => s.id === sentenceId)
+      : undefined;
+    const text = sentence?.text ?? para.originalText;
+    void this.syncPdfHighlight(
+      text,
+      sentence?.page ?? para.page,
+      para.id,
+    );
+  }
+
+  private playParagraph(para: StoredParagraph, sentence?: StoredSentence): void {
+    if (sentence) {
+      void this.paragraphPlayer?.jumpToSentenceId(sentence.id, "en");
+      void this.syncPdfHighlight(
+        sentence.text,
+        sentence.page ?? para.page,
+        para.id,
+      );
+      return;
+    }
+    void this.paragraphPlayer?.jumpToParagraphId(para.id, "en");
+    void this.syncPdfHighlight(para.originalText, para.page, para.id);
+  }
+
+  private makeParagraphPlayButton(
+    para: StoredParagraph,
+    sentence?: StoredSentence,
+  ): HTMLButtonElement {
+    const playBtn = this.doc.createElement("button");
+    playBtn.type = "button";
+    playBtn.className = "chatpapers-lecture-beat-play";
+    playBtn.title = getString("lecture-para-play");
+    playBtn.setAttribute("aria-label", getString("lecture-para-play"));
+    playBtn.append(
+      createLucideIcon(this.doc, Play, {
+        size: 14,
+        className: "chatpapers-lecture-btn-icon",
+      }),
+    );
+    const canPlay = sentence
+      ? sentence.ttsZhStatus === "ready" ||
+        sentence.ttsEnStatus === "ready" ||
+        para.genStatus === "ready"
+      : para.ttsZhStatus === "ready" || para.genStatus === "ready";
+    playBtn.disabled = !canPlay;
+    playBtn.addEventListener("click", (event) => {
+      event.stopPropagation();
+      this.playParagraph(para, sentence);
+    });
+    return playBtn;
+  }
+
+  private makeParagraphRow(
+    paragraphs: StoredParagraph[],
+    para: StoredParagraph,
+  ): HTMLElement {
+    const row = this.el("div", "chatpapers-lecture-beat-item");
+    row.dataset.beatId = para.id;
+    if (this.isParagraphSelected(para.id)) row.classList.add("is-selected");
+    if (this.isParagraphPlaying(para.id)) row.classList.add("is-active");
+    if (para.ttsZhStatus !== "ready") row.classList.add("is-pending");
+
+    const main = this.doc.createElement("button");
+    main.type = "button";
+    main.className = "chatpapers-lecture-beat-main";
+
+    const line = this.el("div", "chatpapers-lecture-beat-line");
+    line.append(
       this.el(
         "span",
-        "chatpapers-lecture-beat-type",
+        "chatpapers-lecture-beat-label",
         getString("lecture-para-label", { args: { n: para.orderIndex + 1 } }),
       ),
-      this.el(
+      this.el("span", "chatpapers-lecture-beat-preview", para.originalText),
-        "span",
-        "chatpapers-lecture-beat-title",
-        `${preview}${para.originalText.length > 60 ? "…" : ""}`,
-      ),
     );
 
     const status = this.el("span", "chatpapers-lecture-beat-status");
@@ -680,48 +770,47 @@ export class LecturePaneView {
       status.textContent = "…";
     }
 
-    row.append(meta, status);
+    main.append(line, status);
-    row.addEventListener("click", () => {
+    main.title = para.originalText;
-      void this.paragraphPlayer?.jumpToParagraphId(para.id, "en");
+    main.addEventListener("click", () => {
-      void this.syncPdfHighlight(
+      this.selectParagraph(paragraphs, para.id);
-        para.originalText,
-        para.page,
-        para.id,
-      );
     });
+
+    row.append(main, this.makeParagraphPlayButton(para));
     return row;
   }
 
   private makeSentenceRow(
+    paragraphs: StoredParagraph[],
     para: StoredParagraph,
     sentence: StoredSentence,
-  ): HTMLButtonElement {
+  ): HTMLElement {
-    const row = this.doc.createElement("button") as HTMLButtonElement;
+    const row = this.el("div", "chatpapers-lecture-beat-item chatpapers-lecture-sentence-item");
-    row.type = "button";
-    row.className =
-      "chatpapers-lecture-beat-item chatpapers-lecture-sentence-item";
     row.dataset.sentenceId = sentence.id;
-    if (sentence.id === this.activeSentenceId) row.classList.add("is-active");
+    if (this.isParagraphSelected(para.id, sentence.id)) {
+      row.classList.add("is-selected");
+    }
+    if (this.isParagraphPlaying(para.id, sentence.id)) {
+      row.classList.add("is-active");
+    }
     if (sentence.ttsZhStatus !== "ready" && sentence.ttsEnStatus !== "ready") {
       row.classList.add("is-pending");
-      row.disabled = para.genStatus !== "ready";
     }
 
-    const meta = this.el("div", "chatpapers-lecture-beat-meta");
+    const main = this.doc.createElement("button");
-    const preview = sentence.text.slice(0, 72);
+    main.type = "button";
-    meta.append(
+    main.className = "chatpapers-lecture-beat-main";
+
+    const line = this.el("div", "chatpapers-lecture-beat-line");
+    line.append(
       this.el(
         "span",
-        "chatpapers-lecture-beat-type",
+        "chatpapers-lecture-beat-label",
         getString("lecture-sentence-label", {
           args: { p: para.orderIndex + 1, s: sentence.orderIndex + 1 },
         }),
       ),
-      this.el(
+      this.el("span", "chatpapers-lecture-beat-preview", sentence.text),
-        "span",
-        "chatpapers-lecture-beat-title",
-        `${preview}${sentence.text.length > 72 ? "…" : ""}`,
-      ),
     );
 
     const status = this.el("span", "chatpapers-lecture-beat-status");
@@ -731,15 +820,13 @@ export class LecturePaneView {
       status.textContent = getString("lecture-beat-tts-pending");
     }
 
-    row.append(meta, status);
+    main.append(line, status);
-    row.addEventListener("click", () => {
+    main.title = sentence.text;
-      void this.paragraphPlayer?.jumpToSentenceId(sentence.id, "en");
+    main.addEventListener("click", () => {
-      void this.syncPdfHighlight(
+      this.selectParagraph(paragraphs, para.id, sentence.id);
-        sentence.text,
-        sentence.page ?? para.page,
-        para.id,
-      );
     });
+
+    row.append(main, this.makeParagraphPlayButton(para, sentence));
     return row;
   }
 
@@ -749,18 +836,47 @@ export class LecturePaneView {
     kind?: "en" | "zh",
     sentenceId?: string,
   ): void {
-    const para = paragraphs.find((p) => p.id === paragraphId);
+    const para = paragraphId
+      ? paragraphs.find((p) => p.id === paragraphId)
+      : undefined;
     this.paragraphDetailEl.replaceChildren();
     if (!para) {
-      this.paragraphDetailEl.hidden = true;
+      this.paragraphDetailEl.hidden = false;
+      this.paragraphDetailEl.classList.add("is-empty");
+      this.paragraphDetailEl.classList.remove("chatpapers-lecture-scroll-y");
+      this.paragraphDetailEl.append(
+        this.el(
+          "div",
+          "chatpapers-lecture-para-detail-empty",
+          getString("lecture-para-detail-empty"),
+        ),
+      );
       return;
     }
     this.paragraphDetailEl.hidden = false;
+    this.paragraphDetailEl.classList.remove("is-empty");
+    this.paragraphDetailEl.classList.add("chatpapers-lecture-scroll-y");
 
     const sentence = sentenceId
       ? para.sentences?.find((s) => s.id === sentenceId)
       : undefined;
 
+    const playBtn = this.doc.createElement("button");
+    playBtn.type = "button";
+    playBtn.className =
+      "chatpapers-lecture-secondary chatpapers-lecture-para-play-btn";
+    playBtn.append(
+      createLucideIcon(this.doc, Play, {
+        size: 14,
+        className: "chatpapers-lecture-btn-icon",
+      }),
+      this.doc.createTextNode(getString("lecture-para-play")),
+    );
+    playBtn.addEventListener("click", () => {
+      this.playParagraph(para, sentence);
+    });
+    this.paragraphDetailEl.append(playBtn);
+
     const kindLabel =
       kind === "en"
         ? getString("lecture-playing-en")
@@ -796,13 +912,12 @@ export class LecturePaneView {
     if (sentence && (para.sentences?.length ?? 0) > 1) {
       const sentenceList = this.el("div", "chatpapers-lecture-sentence-list");
       for (const s of para.sentences ?? []) {
-        const item = this.el(
+        const item = this.doc.createElement("button");
-          "div",
+        item.type = "button";
-          `chatpapers-lecture-sentence-chip${s.id === sentence.id ? " is-active" : ""}`,
+        item.className = `chatpapers-lecture-sentence-chip${s.id === sentence.id ? " is-active" : ""}`;
-          s.text,
+        item.textContent = s.text;
-        );
         item.addEventListener("click", () => {
-          void this.paragraphPlayer?.jumpToSentenceId(s.id, "en");
+          this.selectParagraph(paragraphs, para.id, s.id);
         });
         sentenceList.append(item);
       }

src/modules/lecture/ui/registerLecturePane.ts

@@ -49,6 +49,7 @@ export function registerLecturePane() {
       body.replaceChildren();
       const doc = body.ownerDocument;
       if (!doc) return;
+      applyItemPaneSectionButtonIcons(body);
       const loading = doc.createElement("div");
       loading.className = "chatpapers-loading";
       loading.textContent = getString("lecture-loading");
@@ -81,6 +82,7 @@ export function registerLecturePane() {
       }
     },
     onToggle: ({ body, event }) => {
+      applyItemPaneSectionButtonIcons(body);
       onItemPaneSectionToggle({ body, event });
     },
   });

src/modules/ui/itemPaneSection.ts

@@ -2,6 +2,7 @@
 
 import { config } from "../../../package.json";
 import { getLocaleID, getString } from "../../utils/locale";
+import type { FluentMessageId } from "../../../typings/i10n";
 import { getPref, setPref } from "../../utils/prefs";
 import { openChatPaneWindow, openLecturePaneWindow } from "./itemPaneWindow";
 
@@ -37,36 +38,71 @@ export function isAdaptiveHeight(kind: ItemPaneKind): boolean {
   return val !== false;
 }
 
-function setSectionButtonIcons(btn: HTMLElement, icon: string): void {
+function sectionButtonTooltip(messageId: FluentMessageId): string {
+  const fromBranch = getString(messageId, { branch: "tooltiptext" });
+  const l10nId = getLocaleID(messageId);
+  if (fromBranch && fromBranch !== l10nId) return fromBranch;
+  return getString(messageId);
+}
+
+function applySectionButtonTooltip(
+  btn: HTMLElement,
+  messageId: FluentMessageId,
+): void {
+  const l10nId = getLocaleID(messageId);
+  const tooltip = sectionButtonTooltip(messageId);
+  btn.setAttribute("data-l10n-id", l10nId);
+  btn.setAttribute("title", tooltip);
+  btn.setAttribute("tooltiptext", tooltip);
+  try {
+    btn.ownerDocument?.l10n?.setAttributes?.(btn, l10nId);
+  } catch {
+    // ignore if Fluent is not ready on this document yet
+  }
+}
+
+function styleSectionButtonIcon(btn: HTMLElement, icon: string): void {
   const url = `url('${icon}')`;
   btn.style.setProperty("--custom-button-icon-light", url);
   btn.style.setProperty("--custom-button-icon-dark", url);
+  btn.style.setProperty("list-style-image", url);
+  btn.style.setProperty("-moz-context-properties", "fill, fill-opacity");
+  btn.style.setProperty("fill", "currentColor");
 }
 
-function applyOpenInWindowButtonIcon(body: HTMLElement): void {
+function findSectionButton(
+  section: HTMLElement | null,
+  type: string,
+): HTMLElement | null {
+  if (!section) return null;
+  return (section.querySelector(`.${type}.section-custom-button`) ??
+    section.querySelector(`.${type}`)) as HTMLElement | null;
+}
+
+function applyOpenInWindowButtonIcon(body: HTMLElement): boolean {
   const section = resolveCollapsibleSection(body);
-  const btn = section?.querySelector(
+  const btn = findSectionButton(section, "open-in-window");
-    ".open-in-window.section-custom-button",
+  if (!btn) return false;
-  ) as HTMLElement | null;
+  styleSectionButtonIcon(btn, OPEN_WINDOW_ICON);
-  if (!btn) return;
+  applySectionButtonTooltip(btn, "item-pane-open-window");
-  setSectionButtonIcons(btn, OPEN_WINDOW_ICON);
+  return true;
 }
 
 export function updateAdaptiveButtonState(
   body: HTMLElement,
   adaptive: boolean,
-): void {
+): boolean {
   const section = resolveCollapsibleSection(body);
-  const btn = section?.querySelector(
+  const btn = findSectionButton(section, "adaptive-height");
-    ".adaptive-height.section-custom-button",
+  if (!btn) return false;
-  ) as HTMLElement | null;
-  if (!btn) return;
   btn.setAttribute("aria-pressed", adaptive ? "true" : "false");
   btn.classList.toggle("chatpapers-adaptive-active", adaptive);
-  setSectionButtonIcons(btn, adaptive ? ADAPTIVE_ICON : ADAPTIVE_ICON_OFF);
+  styleSectionButtonIcon(btn, adaptive ? ADAPTIVE_ICON : ADAPTIVE_ICON_OFF);
-  btn.title = getString(
+  applySectionButtonTooltip(
+    btn,
     adaptive ? "item-pane-adaptive-height-on" : "item-pane-adaptive-height-off",
   );
+  return true;
 }
 
 export function applyItemPaneSectionButtonIcons(
@@ -74,9 +110,17 @@ export function applyItemPaneSectionButtonIcons(
   adaptive = isAdaptiveHeight(
     (body.dataset.chatpapersPaneKind || "chat") as ItemPaneKind,
   ),
+  attempt = 0,
 ): void {
-  applyOpenInWindowButtonIcon(body);
+  const openReady = applyOpenInWindowButtonIcon(body);
-  updateAdaptiveButtonState(body, adaptive);
+  const adaptiveReady = updateAdaptiveButtonState(body, adaptive);
+  if ((openReady && adaptiveReady) || attempt >= 8) return;
+
+  const win = body.ownerDocument?.defaultView;
+  if (!win) return;
+  win.requestAnimationFrame(() => {
+    applyItemPaneSectionButtonIcons(body, adaptive, attempt + 1);
+  });
 }
 
 export function applyAdaptiveHeight(

src/modules/ui/readerPane.ts

@@ -49,6 +49,7 @@ export function registerChatPane() {
       body.replaceChildren();
       const doc = body.ownerDocument;
       if (!doc) return;
+      applyItemPaneSectionButtonIcons(body);
       const loading = doc.createElement("div");
       loading.className = "chatpapers-loading";
       loading.textContent = getString("chat-loading");
@@ -72,6 +73,7 @@ export function registerChatPane() {
       }
     },
     onToggle: ({ body, event }) => {
+      applyItemPaneSectionButtonIcons(body);
       onItemPaneSectionToggle({ body, event });
     },
   });

typings/i10n.d.ts

@@ -61,8 +61,11 @@ export type FluentMessageId =
   | 'lecture-no-pdf'
   | 'lecture-note-saved'
   | 'lecture-para-context'
+  | 'lecture-para-detail-empty'
   | 'lecture-para-label'
+  | 'lecture-para-list-hint'
   | 'lecture-para-original'
+  | 'lecture-para-play'
   | 'lecture-para-translation'
   | 'lecture-paragraph-list-title'
   | 'lecture-pdf-sync-hint'