diff --git a/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/ai-content-generator-slot.tsx b/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/ai-content-generator-slot.tsx
deleted file mode 100644
index 9c4c940..0000000
--- a/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/ai-content-generator-slot.tsx
+++ /dev/null
@@ -1,27 +0,0 @@
-"use client";
-
-import { AiLessonContentGenerator } from "@/modules/ai/components/ai-lesson-content-generator";
-import { useAiClientOptional } from "@/modules/ai/context/ai-client-provider";
-import type { AiContentGeneratorSlotProps } from "@/modules/lesson-preparation/components/node-edit-panel";
-
-/**
- * P0-11 修复：AI 内容生成器 slot 实现。
- * 此组件在 app 层组合 @/modules/ai 的具体实现，
- * 通过 props 注入到 lesson-preparation 模块的 NodeEditPanel，
- * 避免备课模块直接依赖 @/modules/ai。
- */
-export function AiContentGeneratorSlot({
-  topic,
-  textbookId,
-  chapterId,
-}: AiContentGeneratorSlotProps) {
-  const aiClient = useAiClientOptional();
-  if (!aiClient) return null;
-  return (
-    <AiLessonContentGenerator
-      topic={topic}
-      textbookId={textbookId}
-      chapterId={chapterId}
-    />
-  );
-}
diff --git a/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/page.tsx b/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/page.tsx
index 62c0709..25d27e3 100644
--- a/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/page.tsx
+++ b/src/app/(dashboard)/teacher/lesson-plans/[planId]/edit/page.tsx
@@ -11,8 +11,6 @@ import { Permissions } from "@/shared/types/permissions"
 import { Skeleton } from "@/shared/components/ui/skeleton"
 import { AiClientProvider } from "@/modules/ai/context/ai-client-provider"
 import { createCoreAiClientService } from "@/modules/ai/context/create-ai-client-service"
-// P0-11 修复：通过 slot 组件注入 AI 功能，避免备课模块直接 import @/modules/ai
-import { AiContentGeneratorSlot } from "./ai-content-generator-slot"
 
 export const dynamic = "force-dynamic"
 
@@ -70,7 +68,6 @@ export default async function EditLessonPlanPage({
               textbookTitle={textbookTitle}
               chapterTitle={chapterTitle}
               classes={classes}
-              aiContentGenerator={AiContentGeneratorSlot}
             />
           </Suspense>
         </div>
diff --git a/src/modules/lesson-preparation/components/lesson-plan-editor.tsx b/src/modules/lesson-preparation/components/lesson-plan-editor.tsx
index 04472ff..1dc4431 100644
--- a/src/modules/lesson-preparation/components/lesson-plan-editor.tsx
+++ b/src/modules/lesson-preparation/components/lesson-plan-editor.tsx
@@ -3,15 +3,17 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useTranslations } from "next-intl";
 import { useLessonPlanEditor } from "../hooks/use-lesson-plan-editor";
-import { NodeEditor } from "./node-editor";
-import { NodeEditPanel, type AiContentGeneratorSlot } from "./node-edit-panel";
+import { StructureTree } from "./structure-tree/structure-tree";
+import { PaperEditor } from "./paper-editor/paper-editor";
+import { DetailPanel } from "./detail-panel/detail-panel";
+import { AnchorMigrationBanner } from "./anchor-migration-banner";
 import { VersionHistoryDrawer } from "./version-history-drawer";
 import { LessonPlanErrorBoundary } from "./lesson-plan-error-boundary";
 import {
   useLessonPlanContextSafe,
   useLessonPlanTrackerSafe,
 } from "../providers/lesson-plan-provider";
-import type { BlockType, LessonPlanStatus } from "../types";
+import type { LessonPlanStatus } from "../types";
 import { Button } from "@/shared/components/ui/button";
 import {
   AlertDialog,
@@ -24,7 +26,7 @@ import {
   AlertDialogTitle,
   AlertDialogTrigger,
 } from "@/shared/components/ui/alert-dialog";
-import { Plus, Save, History, Book, FileText, Send, Undo2, RotateCw, WifiOff, Printer, Undo, Redo, CalendarClock, ClipboardCheck, Sparkles, Layers } from "lucide-react";
+import { Save, History, Book, FileText, Send, Undo2, RotateCw, WifiOff, Printer, Undo, Redo, CalendarClock, ClipboardCheck, Sparkles, Layers } from "lucide-react";
 import { toast } from "sonner";
 import { PrintView } from "./print-view";
 import { ScheduleDialog } from "./schedule-dialog";
@@ -43,25 +45,8 @@ interface Props {
   textbookTitle?: string;
   chapterTitle?: string;
   classes?: { id: string; name: string }[];
-  /** AI 内容生成器（可选，通过 props 注入避免模块耦合，P0-11 修复）*/
-  aiContentGenerator?: AiContentGeneratorSlot;
 }
 
-const BLOCK_TYPES_TO_ADD: BlockType[] = [
-  "objective",
-  "key_point",
-  "import",
-  "new_teaching",
-  "consolidation",
-  "summary",
-  "homework",
-  "blackboard",
-  "exercise",
-  "text_study",
-  "rich_text",
-  "reflection",
-];
-
 export function LessonPlanEditor({
   planId,
   initialTitle,
@@ -72,7 +57,6 @@ export function LessonPlanEditor({
   textbookTitle,
   chapterTitle,
   classes,
-  aiContentGenerator,
 }: Props) {
   const t = useTranslations("lessonPreparation");
   const editor = useLessonPlanEditor();
@@ -80,7 +64,6 @@ export function LessonPlanEditor({
   const ctx = useLessonPlanContextSafe();
   const service = ctx?.service ?? null;
   const [showVersions, setShowVersions] = useState(false);
-  const [showAddMenu, setShowAddMenu] = useState(false);
   const [showPrint, setShowPrint] = useState(false); // V5-4：打印视图
   const [showSchedule, setShowSchedule] = useState(false); // V5-7：安排课时对话框
   const [showConsistency, setShowConsistency] = useState(false); // V5-19：一致性校验对话框
@@ -90,7 +73,6 @@ export function LessonPlanEditor({
   const [publishing, setPublishing] = useState(false);
   const autoSaveTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
   const versionTimer = useRef<ReturnType<typeof setInterval> | null>(null);
-  const addMenuRef = useRef<HTMLDivElement>(null);
 
   // 初始化：仅在 planId 变化时 hydrate（修复 P1-3）
   const initKey = planId;
@@ -261,18 +243,6 @@ export function LessonPlanEditor({
     return () => window.removeEventListener("beforeunload", handleBeforeUnload);
   }, []);
 
-  // 添加节点菜单点击外部关闭（P3-2）
-  useEffect(() => {
-    if (!showAddMenu) return;
-    function handleClickOutside(e: MouseEvent) {
-      if (addMenuRef.current && !addMenuRef.current.contains(e.target as Node)) {
-        setShowAddMenu(false);
-      }
-    }
-    document.addEventListener("mousedown", handleClickOutside);
-    return () => document.removeEventListener("mousedown", handleClickOutside);
-  }, [showAddMenu]);
-
   const handleManualSave = useCallback(async () => {
     if (!service) return;
     const state = useLessonPlanEditor.getState();
@@ -524,53 +494,24 @@ export function LessonPlanEditor({
         )}
       </div>
 
-      {/* 主区域：画布 + 侧边面板 */}
-      <div className="flex-1 flex overflow-hidden">
-        {/* 节点画布 */}
-        <div className="flex-1 relative">
-          <LessonPlanErrorBoundary>
-            <NodeEditor />
-          </LessonPlanErrorBoundary>
-          {/* 添加节点浮动按钮 */}
-          <div className="absolute bottom-4 left-4 z-10" ref={addMenuRef}>
-            <Button
-              variant="default"
-              onClick={() => setShowAddMenu(!showAddMenu)}
-            >
-              <Plus className="w-4 h-4 mr-1" /> {t("action.addNode")}
-            </Button>
-            {showAddMenu && (
-              <div className="absolute bottom-12 left-0 bg-surface border border-outline-variant rounded-lg shadow-lg p-2 grid grid-cols-2 gap-1 w-72 max-h-[60vh] overflow-y-auto">
-                {BLOCK_TYPES_TO_ADD.map((blockType) => (
-                  <button
-                    key={blockType}
-                    onClick={() => {
-                      editor.addNode(blockType, undefined, t(`blockType.${blockType}`));
-                      setShowAddMenu(false);
-                    }}
-                    className="text-left px-2 py-1 text-sm hover:bg-surface-container-highest rounded"
-                  >
-                    {t(`blockType.${blockType}`)}
-                  </button>
-                ))}
-              </div>
-            )}
-          </div>
-        </div>
+      {/* V4：v3 锚点失效提示 banner */}
+      <AnchorMigrationBanner />
 
-        {/* 侧边内容编辑面板：直接用 selectedNodeId 控制显示（修复 P1-2） */}
-        {editor.selectedNodeId && (
-          <div className="w-[420px] flex-shrink-0">
-            <NodeEditPanel
-              planId={planId}
-              textbookId={textbookId}
-              chapterId={chapterId}
-              classes={classes}
-              aiContentGenerator={aiContentGenerator}
-            />
-          </div>
-        )}
-      </div>
+      {/* V4：三栏布局（结构树 + 纸区 + 详情面板） */}
+      <LessonPlanErrorBoundary>
+        <main
+          style={{
+            display: "grid",
+            gridTemplateColumns: "260px 1fr 380px",
+            height: "calc(100vh - 52px)",
+            overflow: "hidden",
+          }}
+        >
+          <StructureTree />
+          <PaperEditor />
+          <DetailPanel />
+        </main>
+      </LessonPlanErrorBoundary>
 
       <LessonPlanErrorBoundary>
         <VersionHistoryDrawer
diff --git a/src/modules/lesson-preparation/components/node-edit-panel.tsx b/src/modules/lesson-preparation/components/node-edit-panel.tsx
deleted file mode 100644
index 1475b03..0000000
--- a/src/modules/lesson-preparation/components/node-edit-panel.tsx
+++ /dev/null
@@ -1,304 +0,0 @@
-"use client";
-
-import { useState, type ComponentType } from "react";
-import { useTranslations } from "next-intl";
-import { Sparkles, ChevronDown, ChevronUp } from "lucide-react";
-import { useLessonPlanEditor } from "../hooks/use-lesson-plan-editor";
-import { BlockRenderer, BLOCK_REGISTRY } from "../config/block-registry";
-import { LessonPlanErrorBoundary } from "./lesson-plan-error-boundary";
-import { Button } from "@/shared/components/ui/button";
-import { Trash2, X } from "lucide-react";
-import { getNodeColor } from "../lib/node-summary";
-import type { TeachingStage, DifferentiationLevel } from "../types";
-import { TEACHING_STAGE_KEYS, DIFFERENTIATION_LEVEL_KEYS } from "../types";
-
-/**
- * P0-11 修复：AI 内容生成器 slot 类型。
- * 通过 props 注入 AI 组件，避免直接 import @/modules/ai。
- * 调用方（teacher edit 页面）提供具体实现。
- */
-export interface AiContentGeneratorSlotProps {
-  topic: string;
-  textbookId?: string;
-  chapterId?: string;
-}
-
-export type AiContentGeneratorSlot = ComponentType<AiContentGeneratorSlotProps>;
-
-interface Props {
-  textbookId?: string;
-  chapterId?: string;
-  classes?: { id: string; name: string }[];
-  /** V5-5：当前课案 ID（透传给 RichTextBlock 用于素材库 picker） */
-  planId?: string;
-  /** AI 内容生成器（可选，通过 props 注入避免模块耦合）*/
-  aiContentGenerator?: AiContentGeneratorSlot;
-}
-
-export function NodeEditPanel({ textbookId, chapterId, classes, planId, aiContentGenerator }: Props) {
-  const t = useTranslations("lessonPreparation");
-  const tAi = useTranslations("ai");
-  const { doc, selectedNodeId, updateNode, removeNode, selectNode, removeAnchor } =
-    useLessonPlanEditor();
-  const [showAiPanel, setShowAiPanel] = useState(false);
-
-  const node = doc.nodes.find((n) => n.id === selectedNodeId);
-
-  if (!node) {
-    return (
-      <div className="h-full flex items-center justify-center text-on-surface-variant text-sm p-4">
-        {t("editor.selectNodeHint")}
-      </div>
-    );
-  }
-
-  // P2-1：正文节点显示操作提示 + 锚点列表（而非误导性的"内容为空"）
-  if (node.type === "textbook_content") {
-    // 收集所有锚点，并关联到对应的教学节点
-    const anchorsWithNode = doc.anchors
-      .map((a) => {
-        const linkedNode = doc.nodes.find((n) => n.id === a.nodeId);
-        return { anchor: a, nodeTitle: linkedNode?.title ?? "?", nodeType: linkedNode?.type ?? "rich_text" };
-      })
-      .sort((a, b) => a.anchor.start - b.anchor.start);
-
-    return (
-      <div className="h-full flex flex-col border-l border-outline-variant bg-surface">
-        <div className="flex items-center gap-2 px-4 py-2 border-b border-outline-variant">
-          <span className="flex-1 font-title-md text-title-md">
-            {t("editor.textbookContent")}
-          </span>
-          <Button
-            variant="ghost"
-            size="sm"
-            onClick={() => selectNode(null)}
-            aria-label={t("action.close")}
-          >
-            <X className="w-4 h-4" aria-hidden="true" />
-          </Button>
-        </div>
-        <div className="flex-1 overflow-y-auto p-4 space-y-4">
-          {/* 操作提示 */}
-          <div className="rounded-md border border-outline-variant bg-surface-container-low p-3 text-sm text-on-surface-variant">
-            {t("editor.textbookOperateHint")}
-          </div>
-          {/* 锚点列表 */}
-          <div>
-            <div className="text-xs font-medium text-on-surface-variant mb-2">
-              {t("editor.anchorListTitle")}（{anchorsWithNode.length}）
-            </div>
-            {anchorsWithNode.length === 0 ? (
-              <p className="text-sm text-on-surface-variant italic">
-                {t("editor.anchorListEmpty")}
-              </p>
-            ) : (
-              <ul className="space-y-1">
-                {anchorsWithNode.map(({ anchor, nodeTitle, nodeType }) => (
-                  <li
-                    key={anchor.id}
-                    className="flex items-center gap-2 px-2 py-1.5 rounded border border-outline-variant bg-surface-container-lowest text-sm"
-                  >
-                    <span
-                      className="inline-block w-2 h-2 rounded-full flex-shrink-0"
-                      style={{ backgroundColor: getNodeColor(nodeType) }}
-                    />
-                    <span className="inline-flex items-center px-1.5 py-0.5 rounded text-[10px] font-medium bg-secondary text-secondary-foreground flex-shrink-0">
-                      {anchor.type === "range"
-                        ? t("editor.anchorRangeLabel")
-                        : t("editor.anchorPointLabel")}
-                    </span>
-                    <span className="truncate flex-1" title={nodeTitle}>
-                      {nodeTitle}
-                    </span>
-                    {anchor.textPreview && (
-                      <span className="truncate text-xs text-on-surface-variant max-w-[120px]" title={anchor.textPreview}>
-                        &ldquo;{anchor.textPreview}&rdquo;
-                      </span>
-                    )}
-                    <Button
-                      variant="ghost"
-                      size="sm"
-                      className="!p-1 !h-6 !w-6 text-on-surface-variant hover:text-error"
-                      onClick={() => removeAnchor(anchor.id)}
-                      aria-label={t("action.delete")}
-                    >
-                      <Trash2 className="w-3 h-3" />
-                    </Button>
-                  </li>
-                ))}
-              </ul>
-            )}
-          </div>
-        </div>
-      </div>
-    );
-  }
-
-  // 教学节点：textbook_content 分支已上方 return，此处 TypeScript 已收窄为 LessonPlanNode
-  const lessonNode = node;
-
-  // 从节点标题提取主题用于 AI 内容生成
-  const aiTopic = lessonNode.title || t("editor.textbookContent");
-
-  return (
-    <div className="h-full flex flex-col border-l border-outline-variant bg-surface">
-      {/* 面板头部 */}
-      <div className="flex items-center gap-2 px-4 py-2 border-b border-outline-variant">
-        <input
-          value={lessonNode.title}
-          onChange={(e) => updateNode(lessonNode.id, { title: e.target.value })}
-          className="flex-1 bg-transparent font-title-md text-title-md focus:outline-none"
-          aria-label={lessonNode.title}
-        />
-        <Button
-          variant="ghost"
-          size="sm"
-          onClick={() => selectNode(null)}
-          aria-label={t("action.close")}
-        >
-          <X className="w-4 h-4" aria-hidden="true" />
-        </Button>
-      </div>
-
-      {/* V5-15 T1 + V5-18 W6：节点属性条（教学阶段 + 差异化标记） */}
-      <div className="flex items-center gap-2 px-4 py-2 border-b border-outline-variant bg-surface-container-low">
-        {/* 教学阶段 */}
-        <label className="text-xs text-on-surface-variant flex items-center gap-1">
-          {t("editor.stageLabel")}
-        </label>
-        <select
-          value={lessonNode.stage ?? ""}
-          onChange={(e) => {
-            const v = e.target.value;
-            updateNode(lessonNode.id, {
-              stage: v === "" ? undefined : (v as TeachingStage),
-            });
-          }}
-          className="text-xs border border-outline-variant rounded px-1.5 py-0.5 bg-surface"
-          aria-label={t("editor.stageLabel")}
-        >
-          <option value="">{t("editor.stageNone")}</option>
-          {TEACHING_STAGE_KEYS.map((s) => (
-            <option key={s} value={s}>
-              {t(`editor.stage.${s}`)}
-            </option>
-          ))}
-        </select>
-
-        {/* 差异化标记 */}
-        <label className="text-xs text-on-surface-variant flex items-center gap-1 ml-2">
-          {t("editor.differentiationLabel")}
-        </label>
-        <select
-          value={lessonNode.differentiation ?? ""}
-          onChange={(e) => {
-            const v = e.target.value;
-            updateNode(lessonNode.id, {
-              differentiation: v === "" ? undefined : (v as DifferentiationLevel),
-            });
-          }}
-          className="text-xs border border-outline-variant rounded px-1.5 py-0.5 bg-surface"
-          aria-label={t("editor.differentiationLabel")}
-        >
-          <option value="">{t("editor.differentiationNone")}</option>
-          {DIFFERENTIATION_LEVEL_KEYS.map((d) => (
-            <option key={d} value={d}>
-              {t(`editor.differentiation.${d}`)}
-            </option>
-          ))}
-        </select>
-      </div>
-
-      {/* 内容编辑区 - 使用 Error Boundary 包裹 + BlockRenderer 配置驱动渲染 */}
-      <div className="flex-1 overflow-y-auto p-3">
-        <LessonPlanErrorBoundary>
-          <BlockRenderer
-            type={lessonNode.type}
-            blockId={lessonNode.id}
-            data={lessonNode.data}
-            textbookId={textbookId}
-            chapterId={chapterId}
-            classes={classes}
-            planId={planId}
-            onUpdate={(d) => updateNode(lessonNode.id, { data: d })}
-          />
-          {/* BlockRenderer 返回 null 时显示未知类型提示 */}
-          <UnknownBlockHint type={lessonNode.type} t={t} />
-        </LessonPlanErrorBoundary>
-
-        {/* AI 内容生成区（可折叠）— P0-11 修复：通过 props 注入，不直接 import @/modules/ai */}
-        {aiContentGenerator ? (
-          <div className="mt-4 border-t border-outline-variant pt-3">
-            <Button
-              variant="ghost"
-              size="sm"
-              className="w-full justify-between"
-              onClick={() => setShowAiPanel(!showAiPanel)}
-              aria-expanded={showAiPanel}
-            >
-              <span className="flex items-center gap-1">
-                <Sparkles className="w-3.5 h-3.5 text-primary" />
-                {tAi("lessonPrep.generateContent")}
-              </span>
-              {showAiPanel ? (
-                <ChevronUp className="w-3.5 h-3.5" />
-              ) : (
-                <ChevronDown className="w-3.5 h-3.5" />
-              )}
-            </Button>
-            {showAiPanel ? (
-              <div className="mt-2">
-                {(() => {
-                  const AiGenerator = aiContentGenerator;
-                  return (
-                    <AiGenerator
-                      topic={aiTopic}
-                      textbookId={textbookId}
-                      chapterId={chapterId}
-                    />
-                  );
-                })()}
-              </div>
-            ) : null}
-          </div>
-        ) : null}
-      </div>
-
-      {/* 底部操作 */}
-      <div className="px-4 py-2 border-t border-outline-variant">
-        <Button
-          variant="outline"
-          size="sm"
-          className="text-error"
-          onClick={() => removeNode(lessonNode.id)}
-        >
-          <Trash2 className="w-3 h-3 mr-1" aria-hidden="true" />
-          {t("action.delete")}
-        </Button>
-      </div>
-    </div>
-  );
-}
-
-/**
- * 未知 Block 类型提示（配置驱动，当 BlockRenderer 返回 null 时显示）。
- * 独立组件避免在主组件中条件渲染。
- */
-function UnknownBlockHint({
-  type,
-  t,
-}: {
-  type: string;
-  t: ReturnType<typeof useTranslations>;
-}) {
-  // V4 P1-9 修复：knownTypes 从 BLOCK_REGISTRY 派生，消除重复定义
-  const knownTypes: readonly string[] = Object.keys(BLOCK_REGISTRY);
-  if (knownTypes.includes(type)) {
-    return null;
-  }
-  return (
-    <div className="text-on-surface-variant text-sm p-4">
-      {t("editor.unknownBlockType")}
-    </div>
-  );
-}