diff --git a/src/components/BatchGenerateDialog.vue b/src/components/BatchGenerateDialog.vue
index 31f2fc1..5ce7ae2 100644
--- a/src/components/BatchGenerateDialog.vue
+++ b/src/components/BatchGenerateDialog.vue
@@ -98,7 +98,7 @@ function handleClose(): void {
       <!-- 第二步：确认/编辑大纲 -->
       <template v-else-if="phase === 'outline'">
         <p>AI 已生成以下大纲，可直接编辑后开始生成：</p>
-        <textarea v-model="outlineText" class="batch-topics-input" rows="12" />
+        <textarea v-model="outlineText" class="batch-topics-input" rows="24" />
         <p class="batch-topics-count">共 {{ parsedTopics.length }} 个课题</p>
         <div class="dialog-actions">
           <button type="button" :disabled="parsedTopics.length === 0" @click="handleStart">开始生成</button>
diff --git a/src/components/TeachingDesignPage.test.ts b/src/components/TeachingDesignPage.test.ts
index 917d22e..1a1e2c2 100644
--- a/src/components/TeachingDesignPage.test.ts
+++ b/src/components/TeachingDesignPage.test.ts
@@ -4,6 +4,16 @@ import { createEmptyTeachingDesign, type TeachingDesign } from '../domain/teachi
 import TeachingDesignPage from './TeachingDesignPage.vue'
 
 describe('TeachingDesignPage', () => {
+  it('does not show an empty additional content section while editing', () => {
+    const design = createEmptyTeachingDesign('1.md')
+
+    const wrapper = mount(TeachingDesignPage, {
+      props: { design, editable: true },
+    })
+
+    expect(wrapper.text()).not.toContain('附加内容')
+  })
+
   it('adds and removes teaching process rows', async () => {
     const design = createEmptyTeachingDesign('1.md')
     const wrapper = mount(TeachingDesignPage, {
diff --git a/src/components/TeachingDesignPage.vue b/src/components/TeachingDesignPage.vue
index d13627a..6a9c6b0 100644
--- a/src/components/TeachingDesignPage.vue
+++ b/src/components/TeachingDesignPage.vue
@@ -269,7 +269,7 @@ function removeStep(index: number): void {
       </tbody>
     </table>
 
-    <template v-if="design.additionalContent || editable">
+    <template v-if="design.additionalContent.trim()">
       <h2 class="section-heading">附加内容</h2>
       <EditableMarkdown
         :model-value="design.additionalContent"
diff --git a/src/components/WorkspaceToolbar.vue b/src/components/WorkspaceToolbar.vue
index 75b8a14..1b8d7a3 100644
--- a/src/components/WorkspaceToolbar.vue
+++ b/src/components/WorkspaceToolbar.vue
@@ -30,10 +30,10 @@ const saveStatusLabel: Record<SaveStatus, string> = {
   <header class="workspace-toolbar">
     <button type="button" data-testid="back" @click="$emit('back')">返回列表</button>
     <button type="button" data-testid="upload" @click="$emit('upload')">导入教案</button>
-    <button type="button" data-testid="generate" @click="$emit('generate')">生成教案</button>
+    <button type="button" data-testid="generate" @click="$emit('generate')">生成一篇</button>
     <button type="button" data-testid="batch-generate" @click="$emit('batchGenerate')">批量生成</button>
     <button type="button" data-testid="print" :disabled="lessonCount === 0" @click="$emit('print')">打印整册</button>
-    <button type="button" data-testid="export" :disabled="lessonCount === 0" @click="$emit('export')">导出 Markdown</button>
+    <button type="button" data-testid="export" :disabled="lessonCount === 0" @click="$emit('export')">导出 MD</button>
     <button type="button" data-testid="clear" :disabled="lessonCount === 0" @click="$emit('clear')">清空</button>
 
     <span class="workspace-toolbar-count">共 {{ lessonCount }} 课</span>
diff --git a/src/composables/useTeachingBook.test.ts b/src/composables/useTeachingBook.test.ts
index ba11644..49364ae 100644
--- a/src/composables/useTeachingBook.test.ts
+++ b/src/composables/useTeachingBook.test.ts
@@ -18,6 +18,42 @@ function createBookWithDesign(filename = '1.md'): { data: TeachingBook; design:
   return { data, design }
 }
 
+function generatedMarkdownWithAdditionalSection(topic: string): string {
+  return [
+    `# ${topic} 教学设计`,
+    '| | |',
+    '|:---|:---|',
+    `| **课题** | **${topic}** |`,
+    '| **课时** | 1课时（40分钟） |',
+    '| **教学目标** | **知识目标**：理解概念。<br>**技能目标**：完成任务。<br>**素养目标**：规范表达。 |',
+    '| **教学重难点** | **重点**：任务流程。<br>**难点**：问题定位。 |',
+    '| **教学资源准备** | 机房、示例文件。 |',
+    '',
+    '## 教学过程',
+    '',
+    '| 教学环节 | 教学内容 | 教师活动 | 学生活动 | 设计意图 |',
+    '|:---|:---|:---|:---|:---|',
+    '| **1. 导入**<br>（5分钟） | 引出任务。 | **情境导入**<br>展示案例。 | **观察思考**<br>回答问题。 | 明确目标。 |',
+    '',
+    '## 板书设计',
+    '',
+    '```text',
+    `${topic}`,
+    '```',
+    '',
+    '## 教学成效与反思',
+    '',
+    '| | |',
+    '|:---|:---|',
+    '| **教学成效** | 学生完成任务。 |',
+    '| **教学反思** | 后续加强练习。 |',
+    '',
+    '## 附加说明',
+    '',
+    '这是模型额外生成的内容。',
+  ].join('\n')
+}
+
 describe('useTeachingBook', () => {
   beforeEach(() => {
     vi.clearAllMocks()
@@ -140,6 +176,25 @@ describe('useTeachingBook', () => {
     expect(store.book.value.selectedId).toBe(store.book.value.designs[0]?.id)
   })
 
+  it('generateLesson discards unclassified additional content from AI output', async () => {
+    mockGetBook(createEmptyBook())
+    vi.mocked(booksApi.generateLesson).mockResolvedValue({
+      filename: 'css-flex.md',
+      markdown: generatedMarkdownWithAdditionalSection('CSS 弹性布局'),
+    })
+
+    const store = useTeachingBook('b1')
+    await flushPromises()
+
+    const result = await store.generateLesson('CSS 弹性布局')
+
+    expect(result).toEqual({ ok: true })
+    expect(store.book.value.designs[0]?.additionalContent).toBe('')
+    expect(store.book.value.designs[0]?.warnings).not.toContainEqual(
+      expect.objectContaining({ code: 'unclassified-content' }),
+    )
+  })
+
   it('generateLesson returns an error when the API call fails', async () => {
     mockGetBook(createEmptyBook())
     vi.mocked(booksApi.generateLesson).mockRejectedValue(new Error('Deepseek 请求失败。'))
diff --git a/src/composables/useTeachingBook.ts b/src/composables/useTeachingBook.ts
index b7e2c46..c300758 100644
--- a/src/composables/useTeachingBook.ts
+++ b/src/composables/useTeachingBook.ts
@@ -244,10 +244,18 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
     touch()
   }
 
+  function removeGeneratedAdditionalContent(design: TeachingDesign): TeachingDesign {
+    design.additionalContent = ''
+    design.warnings = design.warnings.filter((warning) => warning.code !== 'unclassified-content')
+    return design
+  }
+
   async function generateLesson(topic: string): Promise<GenerateLessonResult> {
     try {
       const result = await booksApi.generateLesson(topic)
-      const design = parseTeachingDesign(result.filename, result.markdown)
+      const design = removeGeneratedAdditionalContent(
+        parseTeachingDesign(result.filename, result.markdown),
+      )
       book.value.designs.push(design)
       book.value.selectedId = design.id
       touch()
@@ -299,7 +307,9 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
 
         try {
           const result = await booksApi.generateLesson(topic)
-          results[index] = parseTeachingDesign(result.filename, result.markdown)
+          results[index] = removeGeneratedAdditionalContent(
+            parseTeachingDesign(result.filename, result.markdown),
+          )
           appendReadyLessons()
         } catch (error) {
           firstError = error instanceof Error ? error.message : '生成失败。'
@@ -322,7 +332,9 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
     const topic = existing.originalFilename.replace(/\.md$/i, '')
     try {
       const result = await booksApi.generateLesson(topic)
-      const newDesign = parseTeachingDesign(result.filename, result.markdown)
+      const newDesign = removeGeneratedAdditionalContent(
+        parseTeachingDesign(result.filename, result.markdown),
+      )
       const index = book.value.designs.findIndex((d) => d.id === id)
       if (index !== -1) {
         book.value.designs.splice(index, 1, newDesign)
diff --git a/src/style.css b/src/style.css
index f054bf2..a5e1b70 100644
--- a/src/style.css
+++ b/src/style.css
@@ -229,8 +229,8 @@ input {
 
 /* Sidebar */
 .lesson-sidebar {
-  width: 260px;
-  flex: 0 0 260px;
+  width: 360px;
+  flex: 0 0 360px;
   background: #fff;
   border-right: 1px solid var(--line);
   overflow-y: auto;
@@ -300,7 +300,7 @@ input {
   color: var(--muted);
   cursor: pointer;
   padding: 0 12px;
-  font-size: 16px;
+  font-size: 24px;
 }
 
 .lesson-sidebar-remove:hover {