diff --git a/app.py b/app.py
index 1bcb92fb..d7b76b34 100755
--- a/app.py
+++ b/app.py
@@ -11829,6 +11829,9 @@ def broadcast_new_event(event):
         else:
             print(f'[WebSocket] 已推送新事件到房间: events_all')
 
+        # 清除事件列表缓存，确保用户刷新页面时获取最新数据
+        clear_events_cache()
+
         print(f'[WebSocket DEBUG] ========== 广播完成 ==========\n')
 
     except Exception as e:
diff --git a/public/images/services/wechat-app.jpg b/public/images/services/wechat-app.jpg
new file mode 100644
index 00000000..e473e0c2
Binary files /dev/null and b/public/images/services/wechat-app.jpg differ
diff --git a/src/mocks/data/events.js b/src/mocks/data/events.js
index 37f6aed4..162b9b72 100644
--- a/src/mocks/data/events.js
+++ b/src/mocks/data/events.js
@@ -609,6 +609,49 @@ function generateEventDescription(industry, importance, seed) {
     return impacts[importance] + details[seed % details.length];
 }
 
+// 概念到层级结构的映射（模拟真实 API 的 concept_hierarchy）
+const conceptHierarchyMap = {
+    // 人工智能主线
+    '大模型': { lv1: '人工智能', lv1_id: 'AI', lv2: 'AI大模型与应用', lv2_id: 'AI_MODEL_APP', lv3: 'AI大模型', lv3_id: 'AI_LLM' },
+    'AI应用': { lv1: '人工智能', lv1_id: 'AI', lv2: 'AI大模型与应用', lv2_id: 'AI_MODEL_APP', lv3: 'AI应用场景', lv3_id: 'AI_APP' },
+    '算力': { lv1: '人工智能', lv1_id: 'AI', lv2: 'AI算力与基础设施', lv2_id: 'AI_INFRA', lv3: 'AI芯片与硬件', lv3_id: 'AI_CHIP' },
+    '数据': { lv1: '人工智能', lv1_id: 'AI', lv2: 'AI大模型与应用', lv2_id: 'AI_MODEL_APP', lv3: '数据要素', lv3_id: 'DATA' },
+    '机器学习': { lv1: '人工智能', lv1_id: 'AI', lv2: 'AI大模型与应用', lv2_id: 'AI_MODEL_APP', lv3: 'AI算法', lv3_id: 'AI_ALGO' },
+    'AI芯片': { lv1: '人工智能', lv1_id: 'AI', lv2: 'AI算力与基础设施', lv2_id: 'AI_INFRA', lv3: 'AI芯片与硬件', lv3_id: 'AI_CHIP' },
+    // 半导体主线
+    '芯片': { lv1: '半导体', lv1_id: 'SEMI', lv2: '芯片设计', lv2_id: 'CHIP_DESIGN', lv3: '芯片设计', lv3_id: 'CHIP' },
+    '晶圆': { lv1: '半导体', lv1_id: 'SEMI', lv2: '芯片制造', lv2_id: 'CHIP_MFG', lv3: '晶圆代工', lv3_id: 'WAFER' },
+    '封测': { lv1: '半导体', lv1_id: 'SEMI', lv2: '封装测试', lv2_id: 'PKG_TEST', lv3: '封装测试', lv3_id: 'PKG' },
+    '国产替代': { lv1: '半导体', lv1_id: 'SEMI', lv2: '国产替代', lv2_id: 'DOMESTIC', lv3: '自主可控', lv3_id: 'SELF_CTRL' },
+    // 新能源主线
+    '电池': { lv1: '新能源', lv1_id: 'ENERGY', lv2: '新能源汽车', lv2_id: 'EV', lv3: '动力电池', lv3_id: 'BATTERY' },
+    '光伏': { lv1: '新能源', lv1_id: 'ENERGY', lv2: '光伏产业', lv2_id: 'SOLAR', lv3: '光伏组件', lv3_id: 'PV_MODULE' },
+    '储能': { lv1: '新能源', lv1_id: 'ENERGY', lv2: '储能产业', lv2_id: 'ESS', lv3: '电化学储能', lv3_id: 'ESS_CHEM' },
+    '新能源车': { lv1: '新能源', lv1_id: 'ENERGY', lv2: '新能源汽车', lv2_id: 'EV', lv3: '整车制造', lv3_id: 'EV_OEM' },
+    '锂电': { lv1: '新能源', lv1_id: 'ENERGY', lv2: '新能源汽车', lv2_id: 'EV', lv3: '锂电池材料', lv3_id: 'LI_MATERIAL' },
+    // 医药主线
+    '创新药': { lv1: '医药生物', lv1_id: 'PHARMA', lv2: '创新药', lv2_id: 'INNOV_DRUG', lv3: '创新药研发', lv3_id: 'DRUG_RD' },
+    'CRO': { lv1: '医药生物', lv1_id: 'PHARMA', lv2: '医药服务', lv2_id: 'PHARMA_SVC', lv3: 'CRO/CDMO', lv3_id: 'CRO' },
+    '医疗器械': { lv1: '医药生物', lv1_id: 'PHARMA', lv2: '医疗器械', lv2_id: 'MED_DEVICE', lv3: '高端器械', lv3_id: 'HI_DEVICE' },
+    '生物制药': { lv1: '医药生物', lv1_id: 'PHARMA', lv2: '生物制药', lv2_id: 'BIO_PHARMA', lv3: '生物药', lv3_id: 'BIO_DRUG' },
+    '仿制药': { lv1: '医药生物', lv1_id: 'PHARMA', lv2: '仿制药', lv2_id: 'GENERIC', lv3: '仿制药', lv3_id: 'GEN_DRUG' },
+    // 消费主线
+    '白酒': { lv1: '消费', lv1_id: 'CONSUMER', lv2: '食品饮料', lv2_id: 'FOOD_BEV', lv3: '白酒', lv3_id: 'BAIJIU' },
+    '食品': { lv1: '消费', lv1_id: 'CONSUMER', lv2: '食品饮料', lv2_id: 'FOOD_BEV', lv3: '食品加工', lv3_id: 'FOOD' },
+    '家电': { lv1: '消费', lv1_id: 'CONSUMER', lv2: '家电', lv2_id: 'HOME_APPL', lv3: '白色家电', lv3_id: 'WHITE_APPL' },
+    '零售': { lv1: '消费', lv1_id: 'CONSUMER', lv2: '商贸零售', lv2_id: 'RETAIL', lv3: '零售连锁', lv3_id: 'CHAIN' },
+    '免税': { lv1: '消费', lv1_id: 'CONSUMER', lv2: '商贸零售', lv2_id: 'RETAIL', lv3: '免税', lv3_id: 'DUTY_FREE' },
+    // 通用概念（分配到多个主线）
+    '政策': { lv1: '宏观政策', lv1_id: 'MACRO', lv2: '产业政策', lv2_id: 'POLICY', lv3: null, lv3_id: null },
+    '利好': { lv1: '市场情绪', lv1_id: 'SENTIMENT', lv2: '利好因素', lv2_id: 'POSITIVE', lv3: null, lv3_id: null },
+    '业绩': { lv1: '基本面', lv1_id: 'FUNDAMENTAL', lv2: '业绩增长', lv2_id: 'EARNINGS', lv3: null, lv3_id: null },
+    '涨停': { lv1: '市场情绪', lv1_id: 'SENTIMENT', lv2: '涨停板', lv2_id: 'LIMIT_UP', lv3: null, lv3_id: null },
+    '龙头': { lv1: '投资策略', lv1_id: 'STRATEGY', lv2: '龙头股', lv2_id: 'LEADER', lv3: null, lv3_id: null },
+    '突破': { lv1: '技术面', lv1_id: 'TECHNICAL', lv2: '技术突破', lv2_id: 'BREAKOUT', lv3: null, lv3_id: null },
+    '合作': { lv1: '公司动态', lv1_id: 'CORP_ACTION', lv2: '战略合作', lv2_id: 'PARTNERSHIP', lv3: null, lv3_id: null },
+    '投资': { lv1: '公司动态', lv1_id: 'CORP_ACTION', lv2: '投资并购', lv2_id: 'MA', lv3: null, lv3_id: null },
+};
+
 // 生成关键词（对象数组格式，包含完整信息）
 function generateKeywords(industry, seed) {
     const commonKeywords = ['政策', '利好', '业绩', '涨停', '龙头', '突破', '合作', '投资'];
@@ -701,6 +744,16 @@ function generateKeywords(industry, seed) {
         const score = (70 + Math.floor((seed * 7 + index * 11) % 30)) / 100; // 0.70-0.99的分数
         const avgChangePct = (Math.random() * 15 - 5).toFixed(2); // -5% ~ +10% 的涨跌幅
 
+        // 获取概念的层级信息
+        const hierarchy = conceptHierarchyMap[name] || {
+            lv1: industry || '其他',
+            lv1_id: 'OTHER',
+            lv2: '未分类',
+            lv2_id: 'UNCATEGORIZED',
+            lv3: null,
+            lv3_id: null
+        };
+
         return {
             concept: name, // 使用 concept 字段而不是 name
             stock_count: 10 + Math.floor((seed + index) % 30), // 10-39个相关股票
@@ -711,7 +764,8 @@ function generateKeywords(industry, seed) {
             },
             match_type: matchTypes[(seed + index) % 3], // 随机匹配类型
             happened_times: generateHappenedTimes(seed + index), // 历史触发时间
-            stocks: generateRelatedStocks(name, seed + index) // 核心相关股票
+            stocks: generateRelatedStocks(name, seed + index), // 核心相关股票
+            hierarchy: hierarchy // 层级信息（用于按主线分组）
         };
     });
 }
diff --git a/src/mocks/handlers/concept.js b/src/mocks/handlers/concept.js
index 8762e072..efa7fe1a 100644
--- a/src/mocks/handlers/concept.js
+++ b/src/mocks/handlers/concept.js
@@ -1009,6 +1009,24 @@ export const conceptHandlers = [
                     { id: 'lv2_15_1', name: '国际贸易', concept_count: 15, concepts: ['跨境电商', '出口', '贸易摩擦', '人民币国际化', '中美贸易', '中欧贸易', '东盟贸易'] },
                     { id: 'lv2_15_2', name: '宏观主题', concept_count: 10, concepts: ['美联储加息', '美债', '汇率', '通胀', '衰退预期', '地缘政治'] }
                 ]
+            },
+            {
+                id: 'lv1_16',
+                name: '传统能源与资源',
+                concept_count: 30,
+                children: [
+                    { id: 'lv2_16_1', name: '煤炭石油', concept_count: 15, concepts: ['煤炭', '动力煤', '焦煤', '石油', '天然气', '页岩油', '油服', '油气开采', '煤化工', '石油化工'] },
+                    { id: 'lv2_16_2', name: '钢铁建材', concept_count: 15, concepts: ['钢铁', '特钢', '铁矿石', '水泥', '玻璃', '建材', '基建', '房地产', '装配式建筑'] }
+                ]
+            },
+            {
+                id: 'lv1_17',
+                name: '公用事业与交运',
+                concept_count: 25,
+                children: [
+                    { id: 'lv2_17_1', name: '公用事业', concept_count: 12, concepts: ['电力', '水务', '燃气', '环保', '垃圾处理', '污水处理', '园林绿化'] },
+                    { id: 'lv2_17_2', name: '交通运输', concept_count: 13, concepts: ['航空', '机场', '港口', '航运', '铁路', '公路', '物流', '快递', '冷链物流'] }
+                ]
             }
         ];
 
diff --git a/src/views/Community/components/DynamicNews/DynamicNewsCard.js b/src/views/Community/components/DynamicNews/DynamicNewsCard.js
index 7ca96b52..ab9f9f9f 100644
--- a/src/views/Community/components/DynamicNews/DynamicNewsCard.js
+++ b/src/views/Community/components/DynamicNews/DynamicNewsCard.js
@@ -113,9 +113,9 @@ const [currentMode, setCurrentMode] = useState('vertical');
 
   // 根据模式选择数据源（使用 useMemo 缓存，避免重复计算）
   // 纵向模式：data 是页码映射 { 1: [...], 2: [...] }
-  // 平铺模式：data 是数组 [...]
+  // 平铺模式 / 主线模式：data 是数组 [...] （共用 fourRowData）
   const modeData = useMemo(
-    () => currentMode === 'four-row' ? fourRowData : verticalData,
+    () => (currentMode === 'four-row' || currentMode === 'mainline') ? fourRowData : verticalData,
     [currentMode, fourRowData, verticalData]
   );
   const {
@@ -134,7 +134,7 @@ const [currentMode, setCurrentMode] = useState('vertical');
     [currentMode, data]
   );
   const allCachedEvents = useMemo(
-    () => currentMode === 'four-row' ? data : undefined,
+    () => (currentMode === 'four-row' || currentMode === 'mainline') ? data : undefined,
     [currentMode, data]
   );
 
@@ -249,14 +249,14 @@ const [currentMode, setCurrentMode] = useState('vertical');
       } else {
         console.log(`[DynamicNewsCard] 纵向模式 + 第${state.currentPage}页 → 不刷新（避免打断用户）`);
       }
-    } else if (mode === 'four-row') {
-      // ========== 平铺模式 ==========
+    } else if (mode === 'four-row' || mode === 'mainline') {
+      // ========== 平铺模式 / 主线模式 ==========
       // 检查滚动位置，只有在顶部时才刷新
       const scrollPos = virtualizedGridRef.current?.getScrollPosition();
 
       if (scrollPos?.isNearTop) {
         // 用户在顶部 10% 区域，安全刷新
-        console.log('[DynamicNewsCard] 平铺模式 + 滚动在顶部 → 刷新列表');
+        console.log(`[DynamicNewsCard] ${mode === 'mainline' ? '主线' : '平铺'}模式 + 滚动在顶部 → 刷新列表`);
         handlePageChange(1); // 清空并刷新
         toast({
           title: '检测到新事件，已刷新',
@@ -266,7 +266,7 @@ const [currentMode, setCurrentMode] = useState('vertical');
         });
       } else {
         // 用户不在顶部，显示提示但不自动刷新
-        console.log('[DynamicNewsCard] 平铺模式 + 滚动不在顶部 → 仅提示，不刷新');
+        console.log(`[DynamicNewsCard] ${mode === 'mainline' ? '主线' : '平铺'}模式 + 滚动不在顶部 → 仅提示，不刷新`);
         toast({
           title: '有新事件发布',
           description: '滚动到顶部查看',
diff --git a/src/views/Community/components/DynamicNews/EventScrollList.js b/src/views/Community/components/DynamicNews/EventScrollList.js
index c1ebf70d..d9be9205 100644
--- a/src/views/Community/components/DynamicNews/EventScrollList.js
+++ b/src/views/Community/components/DynamicNews/EventScrollList.js
@@ -7,15 +7,16 @@ import {
   useColorModeValue
 } from '@chakra-ui/react';
 import VirtualizedFourRowGrid from './layouts/VirtualizedFourRowGrid';
+import GroupedFourRowGrid from './layouts/GroupedFourRowGrid';
 import VerticalModeLayout from './layouts/VerticalModeLayout';
 
 /**
- * 事件列表组件 - 支持纵向和平铺两种展示模式
+ * 事件列表组件 - 支持纵向、平铺、主线三种展示模式
  * @param {Array} events - 当前页的事件列表（服务端已分页）
- * @param {Array} displayEvents - 累积显示的事件列表（平铺模式用）
+ * @param {Array} displayEvents - 累积显示的事件列表（平铺/主线模式用）
  * @param {Function} loadNextPage - 加载下一页（无限滚动）
  * @param {Function} loadPrevPage - 加载上一页（双向无限滚动）
- * @param {Function} onFourRowEventClick - 平铺模式事件点击回调（打开弹窗）
+ * @param {Function} onFourRowEventClick - 平铺/主线模式事件点击回调（打开弹窗）
  * @param {Object} selectedEvent - 当前选中的事件
  * @param {Function} onEventSelect - 事件选择回调
  * @param {string} borderColor - 边框颜色
@@ -24,11 +25,11 @@ import VerticalModeLayout from './layouts/VerticalModeLayout';
  * @param {Function} onPageChange - 页码改变回调
  * @param {boolean} loading - 全局加载状态
  * @param {Object} error - 错误状态
- * @param {string} mode - 展示模式：'vertical'（纵向分栏）| 'four-row'（平铺网格）
+ * @param {string} mode - 展示模式：'vertical'（纵向分栏）| 'four-row'（平铺网格）| 'mainline'（主线分组）
  * @param {boolean} hasMore - 是否还有更多数据
  * @param {Object} eventFollowStatus - 事件关注状态 { [eventId]: { isFollowing, followerCount } }
  * @param {Function} onToggleFollow - 关注按钮回调
- * @param {React.Ref} virtualizedGridRef - VirtualizedFourRowGrid 的 ref（用于获取滚动位置）
+ * @param {React.Ref} virtualizedGridRef - VirtualizedFourRowGrid/GroupedFourRowGrid 的 ref（用于获取滚动位置）
  */
 const EventScrollList = React.memo(({
   events,
@@ -87,7 +88,7 @@ const EventScrollList = React.memo(({
       h="100%"
       pt={0}
       pb={4}
-      px={mode === 'four-row' ? 0 : { base: 0, md: 2 }}
+      px={mode === 'four-row' || mode === 'mainline' ? 0 : { base: 0, md: 2 }}
       position="relative"
       data-scroll-container="true"
       css={{
@@ -113,7 +114,7 @@ const EventScrollList = React.memo(({
     >
       {/* 平铺网格模式 - 使用虚拟滚动 + 双向无限滚动 */}
       <VirtualizedFourRowGrid
-        ref={virtualizedGridRef}         // ⚡ 传递 ref（用于获取滚动位置）
+        ref={mode === 'four-row' ? virtualizedGridRef : null}
         display={mode === 'four-row' ? 'block' : 'none'}
         columnsPerRow={4}                // 每行显示4列
         events={displayEvents || events}  // 使用累积列表（如果有）
@@ -131,6 +132,25 @@ const EventScrollList = React.memo(({
         onRetry={handleRetry}            // 重试回调
       />
 
+      {/* 主线分组模式 - 按 lv2 概念分组 */}
+      <GroupedFourRowGrid
+        ref={mode === 'mainline' ? virtualizedGridRef : null}
+        display={mode === 'mainline' ? 'block' : 'none'}
+        columnsPerRow={4}
+        events={displayEvents || events}
+        selectedEvent={selectedEvent}
+        onEventSelect={onFourRowEventClick}
+        eventFollowStatus={eventFollowStatus}
+        onToggleFollow={onToggleFollow}
+        getTimelineBoxStyle={getTimelineBoxStyle}
+        borderColor={borderColor}
+        loadNextPage={loadNextPage}
+        hasMore={hasMore}
+        loading={loading}
+        error={error}
+        onRetry={handleRetry}
+      />
+
       {/* 纵向分栏模式 */}
       <VerticalModeLayout
         display={mode === 'vertical' ? 'flex' : 'none'}
diff --git a/src/views/Community/components/DynamicNews/ModeToggleButtons.js b/src/views/Community/components/DynamicNews/ModeToggleButtons.js
index ca56536e..f75dc910 100644
--- a/src/views/Community/components/DynamicNews/ModeToggleButtons.js
+++ b/src/views/Community/components/DynamicNews/ModeToggleButtons.js
@@ -6,7 +6,7 @@ import { Button, ButtonGroup } from '@chakra-ui/react';
 
 /**
  * 事件列表模式切换按钮组
- * @param {string} mode - 当前模式 'vertical' | 'four-row'
+ * @param {string} mode - 当前模式 'vertical' | 'four-row' | 'mainline'
  * @param {Function} onModeChange - 模式切换回调
  */
 const ModeToggleButtons = React.memo(({ mode, onModeChange }) => {
@@ -20,11 +20,11 @@ const ModeToggleButtons = React.memo(({ mode, onModeChange }) => {
         列表
       </Button>
       <Button
-        onClick={() => onModeChange('four-row')}
+        onClick={() => onModeChange('mainline')}
         colorScheme="blue"
-        variant={mode === 'four-row' ? 'solid' : 'outline'}
+        variant={mode === 'mainline' ? 'solid' : 'outline'}
       >
-        平铺
+        主线
       </Button>
     </ButtonGroup>
   );
diff --git a/src/views/Community/components/DynamicNews/constants.js b/src/views/Community/components/DynamicNews/constants.js
index 82f60e85..e8bf56ca 100644
--- a/src/views/Community/components/DynamicNews/constants.js
+++ b/src/views/Community/components/DynamicNews/constants.js
@@ -29,6 +29,7 @@ export const PAGINATION_CONFIG = {
 export const DISPLAY_MODES = {
   FOUR_ROW: 'four-row',      // 平铺网格模式
   VERTICAL: 'vertical',      // 纵向分栏模式
+  MAINLINE: 'mainline',      // 主线分组模式（按 lv2 概念分组）
 };
 
 export const DEFAULT_MODE = DISPLAY_MODES.VERTICAL;
diff --git a/src/views/Community/components/DynamicNews/hooks/usePagination.js b/src/views/Community/components/DynamicNews/hooks/usePagination.js
index 942d5855..edf35b22 100644
--- a/src/views/Community/components/DynamicNews/hooks/usePagination.js
+++ b/src/views/Community/components/DynamicNews/hooks/usePagination.js
@@ -49,9 +49,11 @@ export const usePagination = ({
   filtersRef.current = filters;
 
   // 根据模式决定每页显示数量
+  // mainline 模式复用 four-row 的分页配置
   const pageSize = (() => {
     switch (mode) {
       case DISPLAY_MODES.FOUR_ROW:
+      case DISPLAY_MODES.MAINLINE:
         return PAGINATION_CONFIG.FOUR_ROW_PAGE_SIZE;
       case DISPLAY_MODES.VERTICAL:
         return PAGINATION_CONFIG.VERTICAL_PAGE_SIZE;
@@ -73,15 +75,15 @@ export const usePagination = ({
       // 纵向模式：从页码映射获取当前页
       return allCachedEventsByPage?.[currentPage] || [];
     } else {
-      // 平铺模式：返回全部累积数据
+      // 平铺模式 / 主线模式：返回全部累积数据
       return allCachedEvents || [];
     }
   }, [mode, allCachedEventsByPage, allCachedEvents, currentPage]);
 
   // 当前显示的事件列表
   const displayEvents = useMemo(() => {
-    if (mode === DISPLAY_MODES.FOUR_ROW) {
-      // 平铺模式：返回全部累积数据
+    if (mode === DISPLAY_MODES.FOUR_ROW || mode === DISPLAY_MODES.MAINLINE) {
+      // 平铺模式 / 主线模式：返回全部累积数据
       return allCachedEvents || [];
     } else {
       // 纵向模式：返回当前页数据
@@ -122,8 +124,11 @@ export const usePagination = ({
         filters: filtersRef.current
       });
 
+      // mainline 模式使用 four-row 的 API 模式（共用同一份数据）
+      const apiMode = mode === DISPLAY_MODES.MAINLINE ? DISPLAY_MODES.FOUR_ROW : mode;
+
       const result = await dispatch(fetchDynamicNews({
-        mode: mode,  // 传递 mode 参数
+        mode: apiMode,  // 传递 API mode 参数（mainline 映射为 four-row）
         per_page: pageSize,
         pageSize: pageSize,
         clearCache: clearCache,  // 传递 clearCache 参数
diff --git a/src/views/Community/components/DynamicNews/layouts/GroupedFourRowGrid.js b/src/views/Community/components/DynamicNews/layouts/GroupedFourRowGrid.js
new file mode 100644
index 00000000..09765649
--- /dev/null
+++ b/src/views/Community/components/DynamicNews/layouts/GroupedFourRowGrid.js
@@ -0,0 +1,612 @@
+// src/views/Community/components/DynamicNews/layouts/GroupedFourRowGrid.js
+// 按主线（lv2）分组的网格布局组件
+
+import React, { useRef, useMemo, useEffect, forwardRef, useImperativeHandle, useState } from 'react';
+import { useVirtualizer } from '@tanstack/react-virtual';
+import {
+  Box,
+  Grid,
+  Spinner,
+  Text,
+  VStack,
+  Center,
+  HStack,
+  IconButton,
+  useBreakpointValue,
+  useColorModeValue,
+  Flex,
+  Badge,
+  Icon,
+  Collapse,
+} from '@chakra-ui/react';
+import { RepeatIcon, ChevronDownIcon, ChevronRightIcon } from '@chakra-ui/icons';
+import DynamicNewsEventCard from '../../EventCard/DynamicNewsEventCard';
+import { getApiBase } from '@utils/apiConfig';
+
+// ============ 概念层级映射缓存 ============
+// 全局缓存，避免重复请求
+let conceptHierarchyCache = null;
+let conceptHierarchyPromise = null;
+
+/**
+ * 获取概念层级映射（概念名称 -> lv2）
+ * @returns {Promise<Object>} { '煤炭': 'lv2名称', ... }
+ */
+const fetchConceptHierarchy = async () => {
+  // 如果已有缓存，直接返回
+  if (conceptHierarchyCache) {
+    return conceptHierarchyCache;
+  }
+
+  // 如果正在请求中，等待结果
+  if (conceptHierarchyPromise) {
+    return conceptHierarchyPromise;
+  }
+
+  // 发起请求
+  conceptHierarchyPromise = (async () => {
+    try {
+      const apiBase = getApiBase();
+      const response = await fetch(`${apiBase}/concept-api/hierarchy`);
+      if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`);
+      }
+      const data = await response.json();
+
+      // 构建概念名称 -> lv2 映射
+      const mapping = {};
+      const hierarchy = data.hierarchy || [];
+
+      /**
+       * 递归添加概念到映射
+       * @param {Array} concepts - 概念数组（字符串或对象）
+       * @param {string} lv1Name - lv1 名称
+       * @param {string} lv2Name - lv2 名称
+       * @param {string} lv3Name - lv3 名称（可选）
+       */
+      const addConceptsToMapping = (concepts, lv1Name, lv2Name, lv3Name = null) => {
+        if (!concepts || !Array.isArray(concepts)) return;
+        concepts.forEach(concept => {
+          const conceptName = typeof concept === 'string' ? concept : (concept.name || concept.concept);
+          if (conceptName) {
+            mapping[conceptName] = { lv1: lv1Name, lv2: lv2Name, lv3: lv3Name };
+          }
+        });
+      };
+
+      hierarchy.forEach(lv1 => {
+        const lv1Name = lv1.name;
+        const lv2List = lv1.children || [];
+
+        lv2List.forEach(lv2 => {
+          const lv2Name = lv2.name;
+          const lv3List = lv2.children || [];
+
+          // 情况1: lv2 直接包含 concepts（无 lv3）
+          if (lv2.concepts) {
+            addConceptsToMapping(lv2.concepts, lv1Name, lv2Name, null);
+          }
+
+          // 情况2: lv2 包含 lv3 children
+          lv3List.forEach(lv3 => {
+            const lv3Name = lv3.name;
+            // lv3 下的 concepts 或 leaf_concepts
+            const leafConcepts = lv3.concepts || lv3.leaf_concepts || [];
+            addConceptsToMapping(leafConcepts, lv1Name, lv2Name, lv3Name);
+          });
+        });
+      });
+
+      console.log('[GroupedFourRowGrid] 概念层级映射加载完成，共', Object.keys(mapping).length, '个概念');
+      conceptHierarchyCache = mapping;
+      return mapping;
+    } catch (error) {
+      console.error('[GroupedFourRowGrid] 获取概念层级失败:', error);
+      conceptHierarchyPromise = null; // 允许重试
+      return {};
+    }
+  })();
+
+  return conceptHierarchyPromise;
+};
+
+/**
+ * 自定义 Hook：获取概念层级映射
+ */
+const useConceptHierarchy = () => {
+  const [hierarchyMap, setHierarchyMap] = useState(conceptHierarchyCache || {});
+  const [loading, setLoading] = useState(!conceptHierarchyCache);
+
+  useEffect(() => {
+    if (!conceptHierarchyCache) {
+      fetchConceptHierarchy().then(map => {
+        setHierarchyMap(map);
+        setLoading(false);
+      });
+    }
+  }, []);
+
+  return { hierarchyMap, loading };
+};
+
+/**
+ * 从事件的 keywords (related_concepts) 中提取主要的 lv2 分类
+ * @param {Object} event - 事件对象
+ * @param {Object} hierarchyMap - 概念层级映射 { 概念名: { lv1, lv2, lv3 } }
+ * @returns {string} lv2 分类名称
+ */
+const getEventMainLine = (event, hierarchyMap = {}) => {
+  // keywords 即 related_concepts
+  // 真实数据结构: [{ concept: '煤炭', reason: '...' }, ...]
+  // Mock 数据可能有 hierarchy 字段
+  const keywords = event.keywords || event.related_concepts || [];
+
+  if (!keywords.length) {
+    return '其他';
+  }
+
+  // 统计各 lv2 出现次数，取出现最多的
+  const lv2Counts = {};
+  keywords.forEach(keyword => {
+    // 优先使用 keyword 自带的 hierarchy（Mock 数据）
+    let lv2 = keyword.hierarchy?.lv2;
+
+    // 如果没有，从映射表查找（真实数据）
+    if (!lv2) {
+      const conceptName = keyword.concept || keyword.name || keyword;
+      const hierarchy = hierarchyMap[conceptName];
+      lv2 = hierarchy?.lv2;
+    }
+
+    if (lv2) {
+      lv2Counts[lv2] = (lv2Counts[lv2] || 0) + 1;
+    }
+  });
+
+  // 找出出现次数最多的 lv2
+  let maxCount = 0;
+  let mainLv2 = '其他';
+  Object.entries(lv2Counts).forEach(([lv2, count]) => {
+    if (count > maxCount) {
+      maxCount = count;
+      mainLv2 = lv2;
+    }
+  });
+
+  return mainLv2;
+};
+
+/**
+ * 按 lv2 分组事件
+ * @param {Array} events - 事件列表
+ * @param {Object} hierarchyMap - 概念层级映射
+ * @returns {Array} 分组后的数组 [{ lv2, events: [] }, ...]
+ */
+const groupEventsByLv2 = (events, hierarchyMap = {}) => {
+  const groups = {};
+
+  events.forEach(event => {
+    const lv2 = getEventMainLine(event, hierarchyMap);
+    if (!groups[lv2]) {
+      groups[lv2] = [];
+    }
+    groups[lv2].push(event);
+  });
+
+  // 转换为数组并按事件数量排序（多的在前）
+  return Object.entries(groups)
+    .map(([lv2, groupEvents]) => ({
+      lv2,
+      events: groupEvents,
+      eventCount: groupEvents.length,
+    }))
+    .sort((a, b) => b.eventCount - a.eventCount);
+};
+
+/**
+ * 单个分组的标题组件
+ */
+const GroupHeader = ({ lv2, eventCount, isExpanded, onToggle, colorScheme }) => {
+  const headerBg = useColorModeValue('gray.50', 'gray.700');
+  const headerHoverBg = useColorModeValue('gray.100', 'gray.650');
+  const textColor = useColorModeValue('gray.700', 'gray.200');
+  const borderColor = useColorModeValue('gray.200', 'gray.600');
+
+  // 根据主线类型获取配色
+  const getColorScheme = (lv2Name) => {
+    const colorMap = {
+      // 人工智能相关
+      'AI基础设施': 'purple',
+      'AI模型与软件': 'purple',
+      'AI应用': 'purple',
+      // 半导体相关
+      '半导体设备': 'blue',
+      '半导体材料': 'blue',
+      '芯片设计与制造': 'blue',
+      '先进封装': 'blue',
+      // 机器人相关
+      '人形机器人整机': 'pink',
+      '机器人核心零部件': 'pink',
+      '其他类型机器人': 'pink',
+      // 消费电子相关
+      '智能终端': 'cyan',
+      'XR与空间计算': 'cyan',
+      '华为产业链': 'cyan',
+      // 智能驾驶相关
+      '自动驾驶解决方案': 'teal',
+      '智能汽车产业链': 'teal',
+      '车路协同': 'teal',
+      // 新能源相关
+      '新型电池技术': 'green',
+      '电力设备与电网': 'green',
+      '清洁能源': 'green',
+      // 低空与航天
+      '低空经济': 'orange',
+      '商业航天': 'orange',
+      // 国防军工
+      '无人作战与信息化': 'red',
+      '海军装备': 'red',
+      '军贸出海': 'red',
+      // 医药健康
+      '创新药': 'messenger',
+      '医疗器械': 'messenger',
+      '中医药': 'messenger',
+      // 消费相关
+      '食品饮料': 'yellow',
+      '消费服务': 'yellow',
+      // 传统能源与资源
+      '煤炭石油': 'blackAlpha',
+      '钢铁建材': 'blackAlpha',
+      // 公用事业与交运
+      '公用事业': 'gray',
+      '交通运输': 'gray',
+      // 其他
+      '国家战略': 'red',
+      '区域发展': 'red',
+      '有色金属': 'orange',
+      '化工材料': 'orange',
+      '金融科技': 'linkedin',
+      '数字化转型': 'linkedin',
+      '量子科技': 'purple',
+      '脑机接口': 'purple',
+      '国际贸易': 'facebook',
+      '宏观主题': 'facebook',
+    };
+    return colorMap[lv2Name] || 'gray';
+  };
+
+  const scheme = colorScheme || getColorScheme(lv2);
+
+  return (
+    <Flex
+      align="center"
+      justify="space-between"
+      px={4}
+      py={3}
+      bg={headerBg}
+      borderRadius="md"
+      borderWidth="1px"
+      borderColor={borderColor}
+      cursor="pointer"
+      _hover={{ bg: headerHoverBg }}
+      onClick={onToggle}
+      transition="all 0.2s"
+      mb={2}
+    >
+      <HStack spacing={3}>
+        <Icon
+          as={isExpanded ? ChevronDownIcon : ChevronRightIcon}
+          boxSize={5}
+          color={textColor}
+          transition="transform 0.2s"
+        />
+        <Text fontWeight="semibold" fontSize="md" color={textColor}>
+          {lv2}
+        </Text>
+        <Badge colorScheme={scheme} fontSize="xs" borderRadius="full" px={2}>
+          {eventCount} 条事件
+        </Badge>
+      </HStack>
+    </Flex>
+  );
+};
+
+/**
+ * 按主线（lv2）分组的网格布局组件
+ */
+const GroupedFourRowGridComponent = forwardRef(({
+  display = 'block',
+  events,
+  columnsPerRow = 4,
+  CardComponent = DynamicNewsEventCard,
+  selectedEvent,
+  onEventSelect,
+  eventFollowStatus,
+  onToggleFollow,
+  getTimelineBoxStyle,
+  borderColor,
+  loadNextPage,
+  onRefreshFirstPage,
+  hasMore,
+  loading,
+  error,
+  onRetry,
+}, ref) => {
+  const parentRef = useRef(null);
+  const isLoadingMore = useRef(false);
+  const lastRefreshTime = useRef(0);
+
+  // 获取概念层级映射（从 /concept-api/hierarchy 接口）
+  const { hierarchyMap, loading: hierarchyLoading } = useConceptHierarchy();
+
+  // 记录每个分组的展开状态
+  const [expandedGroups, setExpandedGroups] = useState({});
+
+  // 滚动条颜色（主题适配）
+  const scrollbarTrackBg = useColorModeValue('#f1f1f1', '#2D3748');
+  const scrollbarThumbBg = useColorModeValue('#888', '#4A5568');
+  const scrollbarThumbHoverBg = useColorModeValue('#555', '#718096');
+
+  // 响应式列数
+  const responsiveColumns = useBreakpointValue({
+    base: 1,
+    sm: 2,
+    md: 2,
+    lg: 3,
+    xl: 4,
+  });
+
+  const actualColumnsPerRow = responsiveColumns || columnsPerRow;
+
+  // 按 lv2 分组事件（使用层级映射）
+  const groupedEvents = useMemo(() => {
+    return groupEventsByLv2(events, hierarchyMap);
+  }, [events, hierarchyMap]);
+
+  // 初始化展开状态（默认全部展开）
+  useEffect(() => {
+    const initialExpanded = {};
+    groupedEvents.forEach(group => {
+      // 只初始化新的分组，保留已有的状态
+      if (expandedGroups[group.lv2] === undefined) {
+        initialExpanded[group.lv2] = true;
+      }
+    });
+    if (Object.keys(initialExpanded).length > 0) {
+      setExpandedGroups(prev => ({ ...prev, ...initialExpanded }));
+    }
+  }, [groupedEvents]);
+
+  // 切换分组展开/折叠
+  const toggleGroup = (lv2) => {
+    setExpandedGroups(prev => ({
+      ...prev,
+      [lv2]: !prev[lv2]
+    }));
+  };
+
+  // 暴露方法给父组件
+  useImperativeHandle(ref, () => ({
+    getScrollPosition: () => {
+      const scrollElement = parentRef.current;
+      if (!scrollElement) return null;
+
+      const { scrollTop, scrollHeight, clientHeight } = scrollElement;
+      const isNearTop = scrollTop < clientHeight * 0.1;
+
+      return {
+        scrollTop,
+        scrollHeight,
+        clientHeight,
+        isNearTop,
+        scrollPercentage: ((scrollTop + clientHeight) / scrollHeight) * 100,
+      };
+    },
+  }), []);
+
+  // 滚动事件处理（无限滚动 + 顶部刷新）
+  useEffect(() => {
+    if (display === 'none') return;
+
+    const scrollElement = parentRef.current;
+    if (!scrollElement) return;
+
+    const handleScroll = async () => {
+      if (isLoadingMore.current || loading) return;
+
+      const { scrollTop, scrollHeight, clientHeight } = scrollElement;
+      const scrollPercentage = (scrollTop + clientHeight) / scrollHeight;
+
+      // 向下滚动：加载更多
+      if (loadNextPage && hasMore && scrollPercentage > 0.9) {
+        isLoadingMore.current = true;
+        await loadNextPage();
+        isLoadingMore.current = false;
+      }
+
+      // 向上滚动到顶部：刷新
+      if (onRefreshFirstPage && scrollTop < clientHeight * 0.1) {
+        const now = Date.now();
+        if (now - lastRefreshTime.current >= 30000) {
+          isLoadingMore.current = true;
+          lastRefreshTime.current = now;
+          await onRefreshFirstPage();
+          isLoadingMore.current = false;
+        }
+      }
+    };
+
+    scrollElement.addEventListener('scroll', handleScroll);
+    return () => scrollElement.removeEventListener('scroll', handleScroll);
+  }, [display, loadNextPage, onRefreshFirstPage, hasMore, loading]);
+
+  // 内容不足时主动加载
+  useEffect(() => {
+    if (display === 'none') return;
+
+    const scrollElement = parentRef.current;
+    if (!scrollElement || !loadNextPage) return;
+
+    const timer = setTimeout(() => {
+      if (isLoadingMore.current || !hasMore || loading) return;
+
+      const { scrollHeight, clientHeight } = scrollElement;
+      if (scrollHeight <= clientHeight) {
+        isLoadingMore.current = true;
+        loadNextPage().finally(() => {
+          isLoadingMore.current = false;
+        });
+      }
+    }, 500);
+
+    return () => clearTimeout(timer);
+  }, [display, events.length, hasMore, loading, loadNextPage]);
+
+  // 错误指示器
+  const renderErrorIndicator = () => {
+    if (!error) return null;
+
+    return (
+      <Center py={6}>
+        <HStack spacing={2}>
+          <Text color="gray.500" fontSize="sm">
+            数据加载失败，
+          </Text>
+          <IconButton
+            icon={<RepeatIcon />}
+            size="sm"
+            colorScheme="blue"
+            variant="ghost"
+            onClick={onRetry}
+            aria-label="刷新"
+          />
+          <Text
+            color="blue.500"
+            fontSize="sm"
+            fontWeight="medium"
+            cursor="pointer"
+            onClick={onRetry}
+            _hover={{ textDecoration: 'underline' }}
+          >
+            刷新
+          </Text>
+        </HStack>
+      </Center>
+    );
+  };
+
+  // 底部加载指示器
+  const renderLoadingIndicator = () => {
+    if (!hasMore) {
+      return (
+        <Center py={6}>
+          <Text color="gray.500" fontSize="sm">
+            已加载全部内容
+          </Text>
+        </Center>
+      );
+    }
+    if (loading) {
+      return (
+        <Center py={6}>
+          <VStack spacing={2}>
+            <Spinner size="md" color="blue.500" thickness="3px" />
+            <Text color="gray.500" fontSize="sm">
+              加载中...
+            </Text>
+          </VStack>
+        </Center>
+      );
+    }
+    return null;
+  };
+
+  return (
+    <Box
+      ref={parentRef}
+      display={display}
+      overflowY="auto"
+      overflowX="hidden"
+      minH="800px"
+      maxH="800px"
+      w="100%"
+      position="relative"
+      px={2}
+      css={{
+        '&::-webkit-scrollbar': { width: '4px' },
+        '&::-webkit-scrollbar-track': {
+          background: scrollbarTrackBg,
+          borderRadius: '10px',
+        },
+        '&::-webkit-scrollbar-thumb': {
+          background: scrollbarThumbBg,
+          borderRadius: '10px',
+        },
+        '&::-webkit-scrollbar-thumb:hover': {
+          background: scrollbarThumbHoverBg,
+        },
+        scrollBehavior: 'smooth',
+        WebkitOverflowScrolling: 'touch',
+      }}
+    >
+      {/* 分组列表 */}
+      <VStack spacing={4} align="stretch" py={2}>
+        {groupedEvents.map((group) => (
+          <Box key={group.lv2}>
+            {/* 分组标题 */}
+            <GroupHeader
+              lv2={group.lv2}
+              eventCount={group.eventCount}
+              isExpanded={expandedGroups[group.lv2]}
+              onToggle={() => toggleGroup(group.lv2)}
+            />
+
+            {/* 分组内容 */}
+            <Collapse in={expandedGroups[group.lv2]} animateOpacity>
+              <Grid
+                templateColumns={`repeat(${actualColumnsPerRow}, 1fr)`}
+                gap={actualColumnsPerRow === 1 ? 3 : 4}
+                w="100%"
+                px={1}
+              >
+                {group.events.map((event, index) => (
+                  <Box key={event.id} w="100%" minW={0}>
+                    <CardComponent
+                      event={event}
+                      index={index}
+                      isFollowing={eventFollowStatus[event.id]?.isFollowing || false}
+                      followerCount={eventFollowStatus[event.id]?.followerCount || event.follower_count || 0}
+                      isSelected={selectedEvent?.id === event.id}
+                      onEventClick={(clickedEvent) => {
+                        onEventSelect(clickedEvent);
+                      }}
+                      onTitleClick={(e) => {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        onEventSelect(event);
+                      }}
+                      onToggleFollow={() => onToggleFollow?.(event.id)}
+                      timelineStyle={getTimelineBoxStyle?.()}
+                      borderColor={borderColor}
+                    />
+                  </Box>
+                ))}
+              </Grid>
+            </Collapse>
+          </Box>
+        ))}
+      </VStack>
+
+      {/* 底部指示器 */}
+      <Box pt={4}>
+        {error ? renderErrorIndicator() : renderLoadingIndicator()}
+      </Box>
+    </Box>
+  );
+});
+
+GroupedFourRowGridComponent.displayName = 'GroupedFourRowGrid';
+
+const GroupedFourRowGrid = React.memo(GroupedFourRowGridComponent);
+
+export default GroupedFourRowGrid;