diff --git a/src/components/game-distribution/GameDistributionPages.test.tsx b/src/components/game-distribution/GameDistributionPages.test.tsx
index 6812b6914..1a235ae3d 100644
--- a/src/components/game-distribution/GameDistributionPages.test.tsx
+++ b/src/components/game-distribution/GameDistributionPages.test.tsx
@@ -2347,15 +2347,15 @@ describe('GameDetailPage 共创主题入口', () => {
   });
 });
 
-describe('GameLineagePage 可视化与交互', () => {
-  /** 节点卡片上的主行动作按钮（打开详情）与它的卡片容器。 */
-  const openButton = (title: string) =>
-    screen.getByRole('button', { name: `打开《${title}》详情` });
-  const cardOf = async (title: string) =>
-    (
-      await screen.findByRole('button', { name: `打开《${title}》详情` })
-    ).closest('.game-lineage-node') as HTMLElement;
+/** 节点卡片上的主行动作按钮（打开详情）与它的卡片容器：多个 describe 共用。 */
+const openButton = (title: string) =>
+  screen.getByRole('button', { name: `打开《${title}》详情` });
+const cardOf = async (title: string) =>
+  (
+    await screen.findByRole('button', { name: `打开《${title}》详情` })
+  ).closest('.game-lineage-node') as HTMLElement;
 
+describe('GameLineagePage 可视化与交互', () => {
   const treeWithSibling = {
     rootGameId: 'game-root',
     root: createLineageNode({
@@ -2739,6 +2739,155 @@ describe('GameLineagePage 可视化与交互', () => {
   });
 });
 
+describe('GameLineagePage 筛选器 / 主干线 / 信息面板（文档对齐）', () => {
+  const tree = {
+    rootGameId: 'game-root',
+    root: createLineageNode({
+      gameId: 'game-root',
+      title: '根原创',
+      generation: 0,
+      parentGameId: null,
+      playCount: 5,
+    }),
+    nodes: [
+      createLineageNode({
+        gameId: 'game-root',
+        title: '根原创',
+        generation: 0,
+        parentGameId: null,
+        playCount: 5,
+      }),
+      createLineageNode({
+        gameId: 'hot',
+        title: '热门二创',
+        generation: 1,
+        parentGameId: 'game-root',
+        playCount: 999,
+      }),
+      createLineageNode({
+        gameId: 'cold',
+        title: '冷门二创',
+        generation: 1,
+        parentGameId: 'game-root',
+        playCount: 1,
+      }),
+      createLineageNode({
+        gameId: 'deep',
+        title: '深代作品',
+        generation: 2,
+        parentGameId: 'hot',
+        playCount: 3,
+      }),
+    ],
+    truncated: false,
+  };
+
+  it('顶部筛选器：世代筛选只留该代及祖先，改动类型禁用并说明原因', async () => {
+    getGameLineageMock.mockResolvedValueOnce(tree);
+    render(
+      <GameLineagePage
+        rootGameId="game-root"
+        onBack={vi.fn()}
+        onOpenDetail={vi.fn()}
+      />,
+    );
+
+    await screen.findByText('深代作品');
+    const changeType = screen.getByLabelText('按改动类型筛选');
+    expect((changeType as HTMLSelectElement).disabled).toBe(true);
+    expect(
+      screen.getByText('核心改动说明字段尚未上线'),
+    ).toBeTruthy();
+
+    fireEvent.change(screen.getByLabelText('按世代筛选'), {
+      target: { value: '1' },
+    });
+    // 保留第 0、1 代（树不断链），第 2 代被筛掉。
+    expect(screen.queryByText('深代作品')).toBeNull();
+    expect(await cardOf('热门二创')).toBeTruthy();
+    expect(await cardOf('根原创')).toBeTruthy();
+  });
+
+  it('按热度排序：同代内 playCount 高的排在前面', async () => {
+    getGameLineageMock.mockResolvedValueOnce(tree);
+    render(
+      <GameLineagePage
+        rootGameId="game-root"
+        onBack={vi.fn()}
+        onOpenDetail={vi.fn()}
+      />,
+    );
+
+    await screen.findByText('热门二创');
+    fireEvent.click(screen.getByRole('checkbox', { name: '按热度排序' }));
+
+    const coldCard = await cardOf('冷门二创');
+    const hotCard = await cardOf('热门二创');
+    expect(parseFloat(hotCard.style.left)).toBeLessThan(
+      parseFloat(coldCard.style.left),
+    );
+  });
+
+  it('主干线：每代热度最高的节点带「主干」角标，主干边单独标记', async () => {
+    getGameLineageMock.mockResolvedValueOnce(tree);
+    render(
+      <GameLineagePage
+        rootGameId="game-root"
+        onBack={vi.fn()}
+        onOpenDetail={vi.fn()}
+      />,
+    );
+
+    await screen.findByText('热门二创');
+    // 第 1 代主干 = 热门二创（999 > 1）；冷门二创不是主干。
+    expect(
+      (await cardOf('热门二创')).querySelector('.game-lineage-node__trunk'),
+    ).not.toBeNull();
+    expect(
+      (await cardOf('冷门二创')).querySelector('.game-lineage-node__trunk'),
+    ).toBeNull();
+    // 主干线：root→hot 与 hot→deep 两条。
+    expect(
+      document.querySelectorAll('path.game-lineage-edge--trunk').length,
+    ).toBe(2);
+  });
+
+  it('选中节点后右侧信息面板给出简介/授权与「前往体验 / Fork 此版本」', async () => {
+    getGameLineageMock.mockResolvedValueOnce(tree);
+    getGameMock.mockResolvedValueOnce(
+      createGame({
+        summary: '这是一个二创作品的简介',
+        forkAuthorization: 'nonCommercial',
+      }),
+    );
+    const onOpenDetail = vi.fn();
+    render(
+      <GameLineagePage
+        rootGameId="game-root"
+        onBack={vi.fn()}
+        onOpenDetail={onOpenDetail}
+      />,
+    );
+
+    const hotCard = await cardOf('热门二创');
+    // 面板只在选中后出现。
+    expect(screen.queryByLabelText('选中作品信息')).toBeNull();
+    fireEvent.click(hotCard);
+
+    const panel = await screen.findByLabelText('选中作品信息');
+    expect(await within(panel).findByText('这是一个二创作品的简介')).toBeTruthy();
+    expect(within(panel).getByText(/允许非商用共创/u)).toBeTruthy();
+    // 「核心改动说明」字段还没上：不渲染这一行（不假装有数据）。
+    expect(within(panel).queryByText(/核心改动说明/u)).toBeNull();
+
+    fireEvent.click(within(panel).getByRole('button', { name: '前往体验' }));
+    expect(onOpenDetail).toHaveBeenCalledWith('hot');
+
+    fireEvent.click(within(panel).getByRole('button', { name: 'Fork 此版本' }));
+    expect(openForkProtocolMock).toHaveBeenCalledWith('hot');
+  });
+});
+
 describe('GameDetailPage 共创模块（文档对齐）', () => {
   it('世代/授权标签按文档口径渲染，并显示累计衍生作品数', async () => {
     getGameMock.mockResolvedValueOnce(
diff --git a/src/components/game-distribution/GameLineagePage.tsx b/src/components/game-distribution/GameLineagePage.tsx
index b2229d2f9..f0c98adf8 100644
--- a/src/components/game-distribution/GameLineagePage.tsx
+++ b/src/components/game-distribution/GameLineagePage.tsx
@@ -11,9 +11,14 @@ import {
   type WheelEvent as ReactWheelEvent,
 } from 'react';
 
+import {
+  GAME_DISTRIBUTION_FORK_AUTHORIZATION_LABELS,
+  resolveGameForkAuthorization,
+} from '../../../packages/shared/src/contracts/gameDistribution';
 import {
   type GameDistributionGame,
   type GameDistributionLineageResponse,
+  getGame,
   getGameLineage,
 } from '../../services/gameDistributionClient';
 import { CopyFeedbackButton } from '../common/CopyFeedbackButton';
@@ -189,6 +194,11 @@ function LineageTreeNodeCard({
               <span className="game-lineage-node__badge">
                 {generationAxisLabel(generation)}
               </span>
+              {layoutNode.isTrunk ? (
+                <span className="game-lineage-node__trunk" title="该代热度最高的版本">
+                  主干
+                </span>
+              ) : null}
               {isAnchor ? (
                 <span className="game-lineage-node__anchor">当前作品</span>
               ) : null}
@@ -253,6 +263,11 @@ export function GameLineagePage({
   const [error, setError] = useState('');
   const [activeGameId, setActiveGameId] = useState('');
   const [pinnedGameId, setPinnedGameId] = useState('');
+  const [generationFilter, setGenerationFilter] = useState<number | null>(null);
+  const [sortByHeat, setSortByHeat] = useState(false);
+  const [selectedGame, setSelectedGame] = useState<GameDistributionGame | null>(
+    null,
+  );
   const isMobileViewport = useIsMobileViewport();
   const [includeSubtree, setIncludeSubtree] = useState(true);
   const [viewport, setViewport] = useState<ViewportState>({
@@ -307,12 +322,36 @@ export function GameLineagePage({
   }, [loadLineage]);
 
   const nodes = useMemo(() => lineage?.nodes ?? [], [lineage]);
+  /**
+   * 顶部筛选器：按世代筛选（保留该代及其祖先，树不断链）与按热度排序
+   * （同代内 `playCount` 倒序；关闭时保持服务端顺序 = 创建时间序）。
+   */
+  const filteredNodes = useMemo(() => {
+    const kept =
+      generationFilter === null
+        ? [...nodes]
+        : nodes.filter((node) => node.generation <= generationFilter);
+    if (!sortByHeat) return kept;
+    return kept
+      .map((node, index) => ({ node, index }))
+      .sort(
+        (left, right) =>
+          left.node.generation - right.node.generation ||
+          right.node.playCount - left.node.playCount ||
+          left.index - right.index,
+      )
+      .map((item) => item.node);
+  }, [generationFilter, nodes, sortByHeat]);
+  const generationsPresent = useMemo(
+    () => [...new Set(nodes.map((node) => node.generation))].sort((a, b) => a - b),
+    [nodes],
+  );
   // 窄屏用紧凑布局（更小的卡片与间距 + 更大的相对字号），避免「桌面画布缩小 + 字太小」。
   const compactTree = isMobileViewport;
   const layout = useMemo(
     () =>
       buildLineageTreeLayout(
-        nodes,
+        filteredNodes,
         compactTree
           ? {
               // 紧凑态：卡片 176 宽 → 16:9 封面 99 高 + 信息条；度量仍满足「同层 ≥ columnGap」。
@@ -324,7 +363,7 @@ export function GameLineagePage({
             }
           : undefined,
       ),
-    [compactTree, nodes],
+    [compactTree, filteredNodes],
   );
   // 高亮目标：锁定（点击「锁定路径」）优先于 hover/聚焦；锁定后即使祖先移出视口，路径仍由面包屑兜底。
   const highlightTargetId = pinnedGameId || activeGameId;
@@ -430,6 +469,41 @@ export function GameLineagePage({
     [],
   );
 
+  /**
+   * 右侧信息面板的数据：只为**选中的那一个节点**请求一次公开详情（简介 / 授权类型）。
+   * 「核心改动说明」等后端字段，缺失就不渲染这一行。
+   */
+  useEffect(() => {
+    if (!pinnedGameId) {
+      setSelectedGame(null);
+      return;
+    }
+    let alive = true;
+    void (async () => {
+      try {
+        const detail = await getGame(pinnedGameId);
+        if (alive) setSelectedGame(detail ?? null);
+      } catch {
+        if (alive) setSelectedGame(null);
+      }
+    })();
+    return () => {
+      alive = false;
+    };
+  }, [pinnedGameId]);
+  const selectedLayoutNode = pinnedGameId
+    ? (layout.nodes.find((item) => item.gameId === pinnedGameId) ?? null)
+    : null;
+  const selectedForkAuthorization = selectedGame
+    ? resolveGameForkAuthorization(selectedGame.forkAuthorization)
+    : null;
+  const selectedCoreChangeNote =
+    selectedGame && 'coreChangeNote' in selectedGame
+      ? typeof selectedGame.coreChangeNote === 'string'
+        ? selectedGame.coreChangeNote
+        : ''
+      : '';
+
   const zoomBy = useCallback((factor: number) => {
     setViewport((current) => {
       const scale = Math.min(
@@ -593,6 +667,47 @@ export function GameLineagePage({
             </PlatformEmptyState>
           ) : (
             <>
+              <div className="game-lineage-filters">
+                <label className="game-lineage-filter">
+                  <span>世代</span>
+                  <select
+                    aria-label="按世代筛选"
+                    value={generationFilter === null ? 'all' : String(generationFilter)}
+                    onChange={(event) => {
+                      const value = event.target.value;
+                      setGenerationFilter(value === 'all' ? null : Number(value));
+                    }}
+                  >
+                    <option value="all">全部</option>
+                    {generationsPresent.map((generation) => (
+                      <option key={generation} value={generation}>
+                        {generationAxisLabel(generation)}
+                      </option>
+                    ))}
+                  </select>
+                </label>
+                <label className="game-lineage-filter game-lineage-toggle">
+                  <input
+                    type="checkbox"
+                    checked={sortByHeat}
+                    onChange={(event) => setSortByHeat(event.target.checked)}
+                  />
+                  按热度排序
+                </label>
+                {/*
+                  改动类型筛选依赖「本次核心改动说明」字段（后端还没上）。
+                  按「字段可能存在」处理：**禁用 + 说明**，不假装能筛。
+                */}
+                <label className="game-lineage-filter game-lineage-filter--disabled">
+                  <span>改动类型</span>
+                  <select aria-label="按改动类型筛选" disabled>
+                    <option>暂不可用</option>
+                  </select>
+                  <span className="game-lineage-filter__note">
+                    核心改动说明字段尚未上线
+                  </span>
+                </label>
+              </div>
               <div className="game-lineage-viewport-controls">
                 <label className="game-lineage-toggle">
                   <input
@@ -697,13 +812,14 @@ export function GameLineagePage({
                           ['--lineage-branch' as string]: `var(--lineage-branch-${edge.branchIndex % 6})`,
                         }}
                         className={
-                          highlighted &&
+                          (edge.isTrunk ? 'game-lineage-edge--trunk ' : '') +
+                          (highlighted &&
                           highlighted.has(edge.parentGameId) &&
                           highlighted.has(edge.childGameId)
                             ? 'game-lineage-edge game-lineage-edge--active'
                             : highlighted
                               ? 'game-lineage-edge game-lineage-edge--dimmed'
-                              : 'game-lineage-edge'
+                              : 'game-lineage-edge')
                         }
                       />
                     ))}
@@ -814,6 +930,74 @@ export function GameLineagePage({
                     <span className="game-lineage-controls__label">刷新</span>
                   </button>
                 </div>
+                {/*
+                  右侧信息面板：只在**选中节点**时出现，浮动叠加（不推挤画布）。
+                  简介 / 授权类型只为选中的这一个节点请求一次公开详情；
+                  「核心改动说明」是后端待补字段，缺失时整行不渲染。
+                */}
+                {selectedLayoutNode ? (
+                  <aside
+                    className="game-lineage-panel"
+                    aria-label="选中作品信息"
+                  >
+                    <h3 className="game-lineage-panel__title">
+                      {selectedLayoutNode.isStub
+                        ? '原作品已不可用'
+                        : (selectedLayoutNode.title ?? '未命名作品')}
+                    </h3>
+                    <p className="game-lineage-panel__meta">
+                      {generationAxisLabel(selectedLayoutNode.generation)} ·{' '}
+                      {selectedLayoutNode.isStub
+                        ? '标题与作者名不对外展示'
+                        : (selectedLayoutNode.authorName ?? '').trim() ||
+                          '未署名作者'}
+                    </p>
+                    {selectedLayoutNode.isStub ? (
+                      <p className="game-lineage-panel__note">
+                        来源作品已删除或未公开，只保留代际位置。
+                      </p>
+                    ) : (
+                      <>
+                        <p className="game-lineage-panel__summary">
+                          {selectedGame?.summary?.trim() || '暂无简介'}
+                        </p>
+                        <p className="game-lineage-panel__meta">
+                          授权：
+                          {selectedForkAuthorization
+                            ? GAME_DISTRIBUTION_FORK_AUTHORIZATION_LABELS[
+                                selectedForkAuthorization
+                              ]
+                            : '读取中…'}
+                        </p>
+                        {selectedCoreChangeNote ? (
+                          <p className="game-lineage-panel__note">
+                            核心改动说明：{selectedCoreChangeNote}
+                          </p>
+                        ) : null}
+                        <span className="game-lineage-panel__actions">
+                          <button
+                            type="button"
+                            className="game-lineage-panel__button"
+                            onClick={() =>
+                              onOpenDetail(selectedLayoutNode.gameId)
+                            }
+                          >
+                            前往体验
+                          </button>
+                          <button
+                            type="button"
+                            className="game-lineage-panel__button game-lineage-panel__button--primary"
+                            onClick={() =>
+                              launchForkFromNode(selectedLayoutNode.gameId)
+                            }
+                          >
+                            Fork 此版本
+                          </button>
+                        </span>
+                      </>
+                    )}
+                  </aside>
+                ) : null}
               </div>
               {derivedCount === 0 ? (
                 <PlatformEmptyState surface="subpanel" size="panel">
diff --git a/src/components/game-distribution/gameDistribution.css b/src/components/game-distribution/gameDistribution.css
index a375aef2d..dfaeb8188 100644
--- a/src/components/game-distribution/gameDistribution.css
+++ b/src/components/game-distribution/gameDistribution.css
@@ -1018,6 +1018,109 @@
   transition: transform 180ms ease-out;
   will-change: transform;
 }
+/* 顶部筛选器（文档「顶部操作栏」）：世代 / 热度排序 / 改动类型（待字段，禁用）。 */
+.game-lineage-filters {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.5rem;
+}
+.game-lineage-filter {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.3rem;
+  color: var(--platform-text-soft);
+  font-size: 0.78rem;
+}
+.game-lineage-filter select {
+  border: 1px solid var(--platform-surface-border);
+  border-radius: 0.5rem;
+  padding: 0.15rem 0.35rem;
+  background: var(--platform-surface, #fff);
+  color: var(--platform-text-base);
+  font: inherit;
+  font-size: 0.78rem;
+}
+.game-lineage-filter--disabled {
+  opacity: 0.55;
+}
+.game-lineage-filter__note {
+  color: var(--platform-text-soft);
+  font-size: 0.7rem;
+}
+/* 主干线：文档要求「每代热度最高的版本用粗实线连接」。 */
+.game-lineage-edge--trunk {
+  stroke-width: 6;
+}
+.game-lineage-node__trunk {
+  position: absolute;
+  top: 0.35rem;
+  right: 0.35rem;
+  border-radius: 999px;
+  padding: 0.1rem 0.45rem;
+  background: var(--platform-accent-strong);
+  color: #fff;
+  font-size: 0.64rem;
+  font-weight: 700;
+}
+/* 右侧信息面板：浮动叠加在画布右上（控件在右下，避免互相遮挡）。 */
+.game-lineage-panel {
+  position: absolute;
+  z-index: 4;
+  top: 0.6rem;
+  right: 0.6rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.3rem;
+  width: min(18rem, calc(100% - 1.2rem));
+  max-height: calc(100% - 4.5rem);
+  overflow-y: auto;
+  padding: 0.7rem 0.8rem;
+  border: 1px solid var(--platform-surface-border);
+  border-radius: 0.8rem;
+  background: var(--platform-surface, #fff);
+  box-shadow: 0 10px 26px rgba(76, 41, 27, 0.18);
+}
+.game-lineage-panel__title {
+  margin: 0;
+  color: var(--platform-text-strong);
+  font-size: 0.9rem;
+  overflow-wrap: anywhere;
+}
+.game-lineage-panel__meta,
+.game-lineage-panel__note,
+.game-lineage-panel__summary {
+  margin: 0;
+  color: var(--platform-text-soft);
+  font-size: 0.76rem;
+  line-height: 1.5;
+  overflow-wrap: anywhere;
+}
+.game-lineage-panel__summary {
+  color: var(--platform-text-base);
+}
+.game-lineage-panel__actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.35rem;
+  margin-top: 0.15rem;
+}
+.game-lineage-panel__button {
+  border: 1px solid var(--platform-surface-border);
+  border-radius: 999px;
+  padding: 0.2rem 0.7rem;
+  background: transparent;
+  color: var(--platform-text-base);
+  font: inherit;
+  font-size: 0.76rem;
+  font-weight: 600;
+  cursor: pointer;
+}
+.game-lineage-panel__button--primary {
+  border-color: var(--platform-accent-strong);
+  background: rgba(199, 101, 61, 0.14);
+  color: var(--platform-accent-strong);
+}
 .game-lineage-canvas__edges {
   position: absolute;
   top: 0;
@@ -2198,3 +2301,18 @@
   font-size: 0.76rem;
   overflow-wrap: anywhere;
 }
+/* 个人创作数据概览（我的作品页）：与详情页共创模块同一视觉语言。 */
+.co-creation-overview {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.8rem;
+  padding: 0.55rem 0.7rem;
+  border: 1px solid var(--platform-surface-border);
+  border-radius: 0.7rem;
+  background: var(--platform-surface-muted, rgba(104, 54, 36, 0.04));
+}
+.co-creation-overview .co-creation-stat {
+  color: var(--platform-text-soft);
+  font-size: 0.78rem;
+  font-variant-numeric: tabular-nums;
+}
diff --git a/src/components/game-distribution/lineageTreeLayout.test.ts b/src/components/game-distribution/lineageTreeLayout.test.ts
index 2edebb21e..21e4d1a0d 100644
--- a/src/components/game-distribution/lineageTreeLayout.test.ts
+++ b/src/components/game-distribution/lineageTreeLayout.test.ts
@@ -260,6 +260,39 @@ describe('buildLineageTreeLayout', () => {
   });
 });
 
+describe('主干线（每代热度最高的版本）', () => {
+  it('按 playCount 选出每代主干节点，主干边标记 isTrunk', () => {
+    const layout = buildLineageTreeLayout([
+      node('root', 0, null),
+      node('hot', 1, 'root'),
+      node('cold', 1, 'root'),
+      node('hot-child', 2, 'hot'),
+    ]);
+    const byId = new Map(layout.nodes.map((item) => [item.gameId, item]));
+    // node() 里 playCount = generation * 10，同代并列 → 取先出现的那个。
+    expect(byId.get('root')!.isTrunk).toBe(true);
+    expect(byId.get('hot')!.isTrunk).toBe(true);
+    expect(byId.get('cold')!.isTrunk).toBe(false);
+    const trunkEdges = layout.edges.filter((edge) => edge.isTrunk);
+    expect(trunkEdges.map((edge) => edge.id)).toEqual(['root->hot', 'hot->hot-child']);
+  });
+
+  it('热度更高的节点成为主干（显式 playCount 覆盖）', () => {
+    const cold = {
+      ...node('cold', 1, 'root'),
+      playCount: 1000,
+    };
+    const layout = buildLineageTreeLayout([
+      node('root', 0, null),
+      node('hot', 1, 'root'),
+      cold,
+    ]);
+    const byId = new Map(layout.nodes.map((item) => [item.gameId, item]));
+    expect(byId.get('cold')!.isTrunk).toBe(true);
+    expect(byId.get('hot')!.isTrunk).toBe(false);
+  });
+});
+
 describe('collectLineageAncestorChain', () => {
   const nodes = [
     node('root', 0, null, '根原创'),
diff --git a/src/components/game-distribution/lineageTreeLayout.ts b/src/components/game-distribution/lineageTreeLayout.ts
index a8fdc18b5..0f3da5320 100644
--- a/src/components/game-distribution/lineageTreeLayout.ts
+++ b/src/components/game-distribution/lineageTreeLayout.ts
@@ -69,6 +69,11 @@ export type LineageLayoutNode = {
    * 不必等 hover。占位父节点属于它子节点所在的分支。
    */
   branchIndex: number;
+  /**
+   * 主干线节点：**该代 `playCount` 最高**的那个（并列取先出现的；占位节点不参与）。
+   * 文档要求「每代热度最高的版本标为主干线，用粗实线连接」。
+   */
+  isTrunk: boolean;
 };
 
 export type LineageLayoutEdge = {
@@ -81,6 +86,8 @@ export type LineageLayoutEdge = {
   to: { x: number; y: number };
   /** 该边属于哪棵顶级子树，用于默认态按分支着色。 */
   branchIndex: number;
+  /** 主干线：父与子都是各自代际的热度最高节点（渲染成粗实线）。 */
+  isTrunk: boolean;
 };
 
 export type LineageGenerationAxisEntry = {
@@ -259,9 +266,23 @@ export function buildLineageTreeLayout(
       height: nodeHeight,
       isStub: entry.node === null,
       branchIndex: branchByGameId.get(entry.gameId) ?? 0,
+      isTrunk: false,
     };
   });
 
+  // 主干线：每代取 `playCount` 最高的真实节点（占位节点不参与、并列取先出现的）。
+  const trunkByGeneration = new Map<number, LineageLayoutNode>();
+  for (const node of layoutNodes) {
+    if (node.isStub) continue;
+    const current = trunkByGeneration.get(node.generation);
+    if (!current || node.node!.playCount > current.node!.playCount) {
+      trunkByGeneration.set(node.generation, node);
+    }
+  }
+  for (const node of layoutNodes) {
+    node.isTrunk = trunkByGeneration.get(node.generation) === node;
+  }
+
   const layoutById = new Map(layoutNodes.map((node) => [node.gameId, node]));
   const edges: LineageLayoutEdge[] = [];
   for (const node of layoutNodes) {
@@ -304,6 +325,7 @@ export function buildLineageTreeLayout(
       to,
       path,
       branchIndex: parent.branchIndex,
+      isTrunk: parent.isTrunk && node.isTrunk,
     });
   }