diff --git a/docs/V0.2/任务模块/任务模块功能设计.md b/docs/V0.2/任务模块/任务模块功能设计.md
index e7268fc..69fd4e8 100644
--- a/docs/V0.2/任务模块/任务模块功能设计.md
+++ b/docs/V0.2/任务模块/任务模块功能设计.md
@@ -145,10 +145,10 @@
 | T-TK-01 | `Task` 表 | 字段：`title`/`description`/`projectId`/`columnId`/`status`/`assigneeId`/`creatorId`/`doneAt`/`sortOrder` + 关联成员/标签/扩展 |
 | T-TK-02 | `title` 非空校验 | 其余字段允许空；trim 后为空 ⇒ 400 |
 | T-TK-03 | `status` 枚举三值 | DB 层用 `VARCHAR(8)` + 应用层校验（避免 ENUM 改值困难） |
-| T-TK-04 | `TaskDetail` → `ExtrasCard` 组件 | 任意条目增删改，无字段上限（建议 ≤ 20 条） |
-| T-TK-05 | `Task.extras` JSON | 结构 `[{label, value, url?}]`；`value` 支持纯文本或 URL |
-| T-TK-06 | `ExtrasCard` 默认 `collapsed=true` | 首次打开详情为收起态 |
-| T-TK-07 | 无必填校验 | 全空可保存 |
+| T-TK-04 | **已移除 UI**（2026-10-24）：`ExtrasCard` 组件删除；信息记录由项目信息块（T-PJ-13）承载 |
+| T-TK-05 | **随 T-TK-04 移除**；`extras` 字段在 DB 保留不再使用 |
+| T-TK-06 | **随 T-TK-04 移除** |
+| T-TK-07 | **随 T-TK-04 移除** |
 | T-TK-08 | `Task.assigneeId` 单值 | 重复设置以最后一次为准 |
 | T-TK-09 | 新建时服务端默认赋值 | 未显式传 `assigneeId` ⇒ 取 `req.user.id`（B-10） |
 | T-TK-10 | `assigneeId` 允许 `null` | 显式传 `null` 即清空，UI 显示「未指派」 |
diff --git a/docs/V0.2/任务模块/任务模块需求文档.md b/docs/V0.2/任务模块/任务模块需求文档.md
index 324cadd..7d9ffe9 100644
--- a/docs/V0.2/任务模块/任务模块需求文档.md
+++ b/docs/V0.2/任务模块/任务模块需求文档.md
@@ -230,10 +230,10 @@
 | T-TK-01 | 任务包含**基础字段**：标题（必填）、描述、所属项目、看板列、任务状态、负责人、任务成员、标签、创建人、创建时间、更新时间 | 新建任务后上述字段均可正确保存与读取 | P0 |
 | T-TK-02 | 标题为**唯一必填**字段，其余字段均可为空 | 仅填标题即可保存成功；仅清空标题时拒绝保存并提示 | P0 |
 | T-TK-03 | 任务状态为三值枚举：`未开始` / `执行中` / `完成` | 任一任务的状态只能取这三个值之一，不存在第四种取值 | P0 |
-| T-TK-04 | 内置**扩展信息卡片**：可增加任意数量的信息条目，承载开发源码等扩展信息 | 可新增 / 编辑 / 删除任意条目，条目数量不受固定字段限制 | P0 |
-| T-TK-05 | 扩展信息条目支持**任意名称 + 值**，值可为单行文本或链接 | 可录入「仓库 = gitlab/xxx」「分支 = dev」「链接 = https://…」等自由内容 | P0 |
-| T-TK-06 | 扩展信息卡片**可折叠**且**默认收起** | 首次打开任务详情，扩展区为收起状态；可展开 / 收起 | P0 |
-| T-TK-07 | 扩展信息卡片**全部非必填**，全部留空不影响任务保存 | 只填标题保存后，扩展区为空仍成功 | P0 |
+| T-TK-04 | ~~内置扩展信息卡片~~ **已移除**（2026-10-24 评审）：相关信息记录改由**项目信息块**承载（T-PJ-13） | — | 已取消 |
+| T-TK-05 | ~~扩展信息条目~~ **随 T-TK-04 一并移除** | — | 已取消 |
+| T-TK-06 | ~~扩展信息卡片折叠~~ **随 T-TK-04 一并移除** | — | 已取消 |
+| T-TK-07 | ~~扩展信息非必填~~ **随 T-TK-04 一并移除** | — | 已取消 |
 | T-TK-08 | 每条任务有**负责人（单人）** | 任务最多只有一个负责人，重复设置时以最后一次为准 | P0 |
 | T-TK-09 | 新建任务时**负责人默认填入创建者本人** | 新建任务后未手动修改时，负责人即为创建者 | P0 |
 | T-TK-10 | 负责人**允许清空为空** | 清空后任务可正常保存，展示为「未指派」 | P0 |
@@ -432,6 +432,7 @@
 | 32 | 项目信息管理包含什么？ | 改名、归档 / 取消归档、删除（个人项目禁用）、退出（创建人可退），入口在项目管理内（T-PJ-12） |
 | 33 | 任务详情底部按钮遮挡？ | 弹层底部预留**安全区 + 12px** 距离；小屏下弹层可滚动，底部按钮完整可见（T-UI-11） |
 | 34 | 项目相关长文本信息记录在哪？ | 项目管理内新增**信息块**分区：任意多个 {标题, 长文本} 块，独立编辑，属项目级数据（T-PJ-13） |
+| 35 | 任务级「扩展信息」的去留？ | **移除 UI**（2026-10-24 评审）：任务不再带扩展信息，项目相关长文本由项目信息块（T-PJ-13）承载；DB 字段保留不用 |
 
 **仍待评审确认（影响实现口径）：**
 
diff --git a/src/components/task/CopyTaskPopup.jsx b/src/components/task/CopyTaskPopup.jsx
new file mode 100644
index 0000000..a3ea884
--- /dev/null
+++ b/src/components/task/CopyTaskPopup.jsx
@@ -0,0 +1,61 @@
+import { useEffect, useState } from 'react'
+import { DotLoading, Popup, Toast } from 'antd-mobile'
+import { projectApi, taskApi } from '../../api/task.js'
+
+// 跨项目拷贝弹层 (T-CP-*): 选择目标项目 → 深拷贝; 人员不属于目标项目时丢弃并提示
+export default function CopyTaskPopup({ task, visible, onClose, onDone }) {
+  const [projects, setProjects] = useState(null)
+
+  useEffect(() => {
+    if (!visible) return
+    setProjects(null)
+    projectApi.list()
+      .then((d) => setProjects((d.items || []).filter((p) => p.id !== task.projectId && !p.archived)))
+      .catch((e) => {
+        Toast.show({ content: e.message })
+        setProjects([])
+      })
+  }, [visible, task.projectId])
+
+  async function doCopy(projectId, name) {
+    try {
+      const r = await taskApi.copy(task.id, projectId)
+      const dropped = r.dropped || {}
+      const lost = [dropped.assignee?.name, ...(dropped.members || []).map((m) => m.name)].filter(Boolean)
+      Toast.show({
+        content: lost.length
+          ? `已拷贝到「${name}」；${lost.join('、')} 不是该项目成员，已不保留`
+          : `已拷贝到「${name}」`,
+      })
+      onClose?.()
+      onDone?.()
+    } catch (e) {
+      Toast.show({ content: e.message })
+    }
+  }
+
+  return (
+    <Popup
+      visible={visible}
+      onMaskClick={onClose}
+      bodyStyle={{
+        borderTopLeftRadius: 12, borderTopRightRadius: 12,
+        padding: '16px 16px calc(env(safe-area-inset-bottom, 0px) + 20px)',
+      }}
+    >
+      <div className="sheet-title">跨项目拷贝</div>
+      <div className="sheet-sub">「{task.title}」→ 选择目标项目；源任务保持不变</div>
+
+      {!projects && <div className="empty" style={{ padding: '20px 0' }}><DotLoading color="#1677ff" /> 加载项目…</div>}
+      {projects && projects.length === 0 && <div className="extras-empty">没有其他可拷贝的项目</div>}
+      {(projects || []).map((p) => (
+        <div className="pick-row" key={p.id} onClick={() => doCopy(p.id, p.name)}>
+          <div className="avatar">{(p.name || '?').slice(0, 1)}</div>
+          <span className="pn">{p.name}</span>
+          <span className="link">拷贝</span>
+        </div>
+      ))}
+      <div className="btn-ghost" onClick={onClose}>取消</div>
+    </Popup>
+  )
+}
diff --git a/src/components/task/ExtrasCard.jsx b/src/components/task/ExtrasCard.jsx
deleted file mode 100644
index 78b0e73..0000000
--- a/src/components/task/ExtrasCard.jsx
+++ /dev/null
@@ -1,59 +0,0 @@
-import { useState } from 'react'
-
-// 扩展信息卡片 (T-TK-04~07): 任意条目, 默认收起, 全部非必填
-// 条目结构 { label, value, url? }
-export default function ExtrasCard({ extras = [], onChange, readOnly = false }) {
-  const [open, setOpen] = useState(false)
-  const list = Array.isArray(extras) ? extras : []
-
-  const update = (idx, key, val) => {
-    const next = list.map((e, i) => (i === idx ? { ...e, [key]: val } : e))
-    onChange?.(next)
-  }
-
-  const add = () => onChange?.([...list, { label: '', value: '', url: '' }])
-  const remove = (idx) => onChange?.(list.filter((_, i) => i !== idx))
-
-  return (
-    <div className="extras">
-      <div className="extras-head" onClick={() => setOpen((v) => !v)}>
-        <span className="caret">{open ? '▾' : '▸'}</span>
-        <span>扩展信息</span>
-        {list.length > 0 && <span className="tag">{list.length}</span>}
-        <span className="cv">{open ? '收起' : '默认收起 · 全部非必填'}</span>
-      </div>
-
-      {open && (
-        <div className="extras-body">
-          {list.length === 0 && (
-            <div className="extras-empty">暂无条目，可记录仓库 / 分支 / 链接等任意信息</div>
-          )}
-          {list.map((e, i) => (
-            <div className="extra-row" key={i}>
-              <input
-                className="inp extra-k"
-                placeholder="名称"
-                value={e.label || ''}
-                disabled={readOnly}
-                onChange={(ev) => update(i, 'label', ev.target.value)}
-              />
-              <input
-                className="inp extra-v"
-                placeholder="值"
-                value={e.value || ''}
-                disabled={readOnly}
-                onChange={(ev) => update(i, 'value', ev.target.value)}
-              />
-              {!readOnly && (
-                <button type="button" className="extra-del" onClick={() => remove(i)}>×</button>
-              )}
-            </div>
-          ))}
-          {!readOnly && (
-            <button type="button" className="extras-add" onClick={add}>+ 添加一条</button>
-          )}
-        </div>
-      )}
-    </div>
-  )
-}
diff --git a/src/components/task/TaskCard.jsx b/src/components/task/TaskCard.jsx
index 43d0820..23a9ecb 100644
--- a/src/components/task/TaskCard.jsx
+++ b/src/components/task/TaskCard.jsx
@@ -7,7 +7,7 @@ import StatusDot from './StatusDot.jsx'
 const MAX_SUB = 3
 
 export default function TaskCard({
-  task, bindDrag, onClick, onToggleSub, onToggle, onAddSub, dragging = false, highlight = false,
+  task, bindDrag, onClick, onToggleSub, onToggle, onMore, dragging = false, highlight = false,
 }) {
   const children = task.children || []
   const shown = children.slice(0, MAX_SUB)
@@ -38,6 +38,12 @@ export default function TaskCard({
         {task.members?.length > 0 && (
           <span className="bmembers">+ {task.members.map((m) => m.name).join('、')}</span>
         )}
+        {onMore && (
+          <span
+            className="bmore-btn"
+            onClick={(e) => { e.stopPropagation(); onMore(task) }}
+          >⋯</span>
+        )}
       </div>
 
       {shown.map((c) => (
@@ -52,15 +58,6 @@ export default function TaskCard({
         </div>
       ))}
       {rest > 0 && <div className="bmore">+{rest} 个子任务</div>}
-
-      {onAddSub && (
-        <div
-          className="bsub-add"
-          onClick={(e) => { e.stopPropagation(); onAddSub(task) }}
-        >
-          + 子任务
-        </div>
-      )}
     </div>
   )
 }
diff --git a/src/pages/task/BoardView.jsx b/src/pages/task/BoardView.jsx
index a21c7f8..0f31c09 100644
--- a/src/pages/task/BoardView.jsx
+++ b/src/pages/task/BoardView.jsx
@@ -6,7 +6,7 @@ import useLongPressDrag from '../../components/task/useLongPressDrag.js'
 // 看板视图 (T-BD-01, T-UI-07, T-ST-06/12)
 //   列横向滚动; 长按卡片拖拽换列 / 降为子任务
 export default function BoardView({
-  tasks, columns, onMoveColumn, onMakeSubtask, onOpen, onToggleSub, onToggle, onQuickAdd,
+  tasks, columns, onMoveColumn, onMakeSubtask, onOpen, onToggleSub, onToggle, onMore, onQuickAdd,
 }) {
   const [overCol, setOverCol] = useState(null)
 
@@ -54,6 +54,7 @@ export default function BoardView({
                     onClick={() => { if (!drag.dragging) onOpen?.(t) }}
                     onToggleSub={onToggleSub}
                     onToggle={onToggle}
+                    onMore={onMore}
                   />
                 ))}
                 {list.length === 0 && <div className="bcol-empty">暂无任务</div>}
diff --git a/src/pages/task/ListView.jsx b/src/pages/task/ListView.jsx
index 6b70c26..48db7c3 100644
--- a/src/pages/task/ListView.jsx
+++ b/src/pages/task/ListView.jsx
@@ -2,10 +2,10 @@ import { useState } from 'react'
 import TaskRow from '../../components/task/TaskRow.jsx'
 
 // 列表视图 (T-VW-01, T-ST-04/05)
-//   按看板列分组展示(列表不分组也允许, 这里默认分组更接近 Todoist)
-//   子任务缩进 + 折叠展开
+//   按看板列分组展示; 子任务缩进 + 折叠展开
+//   子任务的添加只在任务详情页完成 (或把别的任务转为子任务), 列表页不放入口
 export default function ListView({
-  tasks, columns, onToggle, onOpen, onAddSub,
+  tasks, columns, onToggle, onOpen, onMore,
 }) {
   const [collapsed, setCollapsed] = useState({})
 
@@ -47,12 +47,12 @@ export default function ListView({
                   task={t}
                   onToggle={onToggle}
                   onClick={() => onOpen(t)}
-                  onMore={() => onOpen(t)}
+                  onMore={onMore}
                 />
                 {kids.length > 0 && (
                   <>
                     {!isCollapsed && kids.map((c) => (
-                      <TaskRow key={c.id} task={c} indent onToggle={onToggle} onClick={() => onOpen(c)} />
+                      <TaskRow key={c.id} task={c} indent onToggle={onToggle} onClick={() => onOpen(c)} onMore={onMore} />
                     ))}
                     <div
                       className="collapse"
@@ -62,9 +62,6 @@ export default function ListView({
                     </div>
                   </>
                 )}
-                {kids.length === 0 && onAddSub && (
-                  <div className="sub-add-hint" onClick={() => onAddSub(t)}>+ 子任务</div>
-                )}
               </div>
             )
           })}
diff --git a/src/pages/task/ProjectView.jsx b/src/pages/task/ProjectView.jsx
index 6d8687b..ebc47f8 100644
--- a/src/pages/task/ProjectView.jsx
+++ b/src/pages/task/ProjectView.jsx
@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useState } from 'react'
-import { DotLoading, Toast } from 'antd-mobile'
+import { ActionSheet, Dialog, DotLoading, Toast } from 'antd-mobile'
 import { projectApi, taskApi } from '../../api/task.js'
 import { filterVisible, msToNextBoundary } from './date.js'
 import { getViewMode, setViewMode } from './prefs.js'
@@ -7,6 +7,7 @@ import ListView from './ListView.jsx'
 import BoardView from './BoardView.jsx'
 import TaskDetail from './TaskDetail.jsx'
 import ProjectManage from './ProjectManage.jsx'
+import CopyTaskPopup from '../../components/task/CopyTaskPopup.jsx'
 
 // 项目视图容器: 列表 / 看板 切换 + 数据装载 + 乐观更新
 // 嵌在任务首屏下部 (T-VW-09); 头部仅保留「项目管理」与「+ 新增」(T-PJ-11)
@@ -20,6 +21,7 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
   const [showManage, setShowManage] = useState(false)
   const [adding, setAdding] = useState(false)
   const [tick, setTick] = useState(0) // 保留窗口重算触发
+  const [copyTask, setCopyTask] = useState(null) // ⋯菜单触发的跨项目拷贝
 
   const load = useCallback(() => {
     setErr('')
@@ -136,6 +138,44 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
     }
   }
 
+  /** 任务 ⋯ 菜单: 编辑 / 拷贝到其他项目 / 删除 */
+  function openTaskMenu(task) {
+    ActionSheet.show({
+      extra: (
+        <div className="as-extra">
+          <div className="as-title">{task.title}</div>
+        </div>
+      ),
+      actions: [
+        { text: '编辑', key: 'edit' },
+        { text: '拷贝到其他项目', key: 'copy' },
+        { text: '删除', key: 'delete', bold: true, danger: true },
+      ],
+      cancelText: '取消',
+      onAction: async (item) => {
+        if (item.key === 'edit') setOpenTask(task)
+        else if (item.key === 'copy') setCopyTask(task)
+        else if (item.key === 'delete') {
+          const kids = task.children?.length || 0
+          const ok = await Dialog.confirm({
+            content: kids
+              ? `删除「${task.title}」？将一并删除 ${kids} 条子任务。`
+              : `删除「${task.title}」？`,
+            confirmText: '删除',
+          })
+          if (!ok) return
+          try {
+            await taskApi.remove(task.id)
+            Toast.show({ content: '已删除' })
+            load()
+          } catch (e) {
+            Toast.show({ content: e.message })
+          }
+        }
+      },
+    })
+  }
+
   if (err) {
     return (
       <div className="pv-embed">
@@ -196,7 +236,7 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
             columns={columns}
             onToggle={toggleDone}
             onOpen={(t) => setOpenTask(t)}
-            onAddSub={(parent) => setOpenTask(parent)}
+            onMore={openTaskMenu}
           />
         ) : (
           <BoardView
@@ -207,6 +247,7 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
             onOpen={(t) => setOpenTask(t)}
             onToggleSub={(c) => toggleDone(c)}
             onToggle={(t) => toggleDone(t)}
+            onMore={openTaskMenu}
             onQuickAdd={() => { setAdding(true) }}
           />
         )}
@@ -217,12 +258,22 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
           task={openTask}
           columns={columns}
           members={project.members || []}
+          tasks={tasks || []}
           onClose={() => setOpenTask(null)}
           onSaved={() => { setOpenTask(null); load() }}
           onChanged={load}
         />
       )}
 
+      {copyTask && (
+        <CopyTaskPopup
+          task={copyTask}
+          visible
+          onClose={() => setCopyTask(null)}
+          onDone={load}
+        />
+      )}
+
       {showManage && (
         <ProjectManage
           project={project}
diff --git a/src/pages/task/TaskDetail.jsx b/src/pages/task/TaskDetail.jsx
index 9a6f7f3..75ffe71 100644
--- a/src/pages/task/TaskDetail.jsx
+++ b/src/pages/task/TaskDetail.jsx
@@ -1,19 +1,21 @@
 import { useEffect, useState } from 'react'
-import { Dialog, Popup, Toast } from 'antd-mobile'
-import { projectApi, taskApi } from '../../api/task.js'
+import { ActionSheet, Dialog, Popup, Toast } from 'antd-mobile'
+import { taskApi } from '../../api/task.js'
 import { STATUS_OPTIONS, STATUS_LABEL } from './date.js'
-import ExtrasCard from '../../components/task/ExtrasCard.jsx'
 import UserPicker from '../../components/task/UserPicker.jsx'
 import StatusDot from '../../components/task/StatusDot.jsx'
+import CopyTaskPopup from '../../components/task/CopyTaskPopup.jsx'
 import useKeyboardInset from '../../hooks/useKeyboardInset.js'
 import useOverlayBack from '../../hooks/useOverlayBack.js'
 
-// 任务详情 (T-TK-01~13, T-ST-03, T-AS-05)
-export default function TaskDetail({ task, columns, members, onClose, onSaved, onChanged }) {
+// 任务详情 (T-TK-*, T-ST-03, T-AS-05)
+//   - 状态: 三段式分段控件, 当前项高亮, 点按即切换
+//   - 看板列: ActionSheet 选择, 列/状态联动由服务端裁决 (T-BD-*)
+//   - 转为子任务 / 转为顶层任务 (T-ST-12): 从项目内顶层任务中选父任务
+export default function TaskDetail({ task, columns, members, tasks, onClose, onSaved, onChanged }) {
   const [form, setForm] = useState(() => ({
     title: task.title || '',
     description: task.description || '',
-    extras: task.extras || [],
     memberIds: (task.members || []).map((m) => m.userId),
     assigneeId: task.assignee?.id ?? null,
     status: task.status,
@@ -22,22 +24,28 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
   const [subs, setSubs] = useState(task.children || [])
   const [newSub, setNewSub] = useState('')
   const [saving, setSaving] = useState(false)
-  const [picker, setPicker] = useState(null) // 'assignee' | 'members'
-  const [copies, setCopies] = useState(null) // 其他项目列表(拷贝用)
+  const [picker, setPicker] = useState(null)   // 'assignee' | 'members'
+  const [copyOpen, setCopyOpen] = useState(false)
+  const [parentPick, setParentPick] = useState(false) // 转为子任务: 选择父任务
 
-  // 键盘弹出插入量: 抬升弹层内容, 输入框不被遮挡 (bug#4)
+  // 键盘弹出插入量: 抬升弹层内容, 输入框不被遮挡
   const kb = useKeyboardInset()
   // 返回键: 先关详情弹层, 不离开任务页
   useOverlayBack(true, onClose)
 
   const assigneeName = members.find((m) => m.userId === form.assigneeId)?.name
   const memberNames = members.filter((m) => form.memberIds.includes(m.userId)).map((m) => m.name)
+  const currentCol = (columns || []).find((c) => c.id === task.columnId)
+  const isSubtask = task.parentId != null
+  // 可作为父任务的候选: 同项目顶层任务, 排除自己与已有子任务的任务 (T-ST-01/13)
+  const parentCandidates = (tasks || []).filter(
+    (t) => t.id !== task.id && (t.children || []).length === 0,
+  )
 
   useEffect(() => {
     setForm({
       title: task.title || '',
       description: task.description || '',
-      extras: task.extras || [],
       memberIds: (task.members || []).map((m) => m.userId),
       assigneeId: task.assignee?.id ?? null,
       status: task.status,
@@ -53,7 +61,6 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
       const r = await taskApi.update(task.id, {
         title: form.title.trim(),
         description: form.description,
-        extras: form.extras,
         assigneeId: form.assigneeId,
         memberIds: form.memberIds,
         status: form.status,
@@ -68,6 +75,39 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
     }
   }
 
+  /** 换列: 服务端按目标列绑定裁决状态 (T-BD-04/07) */
+  function pickColumn() {
+    ActionSheet.show({
+      actions: (columns || []).map((c) => ({
+        text: c.name + (c.id === task.columnId ? ' ✓' : ''),
+        key: String(c.id),
+      })),
+      cancelText: '取消',
+      onAction: async (item) => {
+        const columnId = Number(item.key)
+        if (columnId === task.columnId) return
+        try {
+          const r = await taskApi.update(task.id, { columnId })
+          Toast.show({ content: `已移入 ${(columns || []).find((c) => c.id === columnId)?.name || '目标列'}` })
+          onSaved?.(r.item)
+        } catch (e) {
+          Toast.show({ content: e.message })
+        }
+      },
+    })
+  }
+
+  /** 转为子任务 (T-ST-12) / 转为顶层 */
+  async function changeParent(parentId) {
+    try {
+      const r = await taskApi.update(task.id, { parentId })
+      Toast.show({ content: parentId ? '已转为子任务' : '已转为顶层任务' })
+      onSaved?.(r.item)
+    } catch (e) {
+      Toast.show({ content: e.message })
+    }
+  }
+
   async function addSub() {
     const t = newSub.trim()
     if (!t) return
@@ -109,32 +149,6 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
     }
   }
 
-  async function openCopy() {
-    try {
-      const d = await projectApi.list()
-      setCopies((d.items || []).filter((p) => p.id !== task.projectId && !p.archived))
-    } catch (e) {
-      Toast.show({ content: e.message })
-    }
-  }
-
-  async function doCopy(projectId) {
-    try {
-      const r = await taskApi.copy(task.id, projectId)
-      const dropped = r.dropped || {}
-      const lost = [dropped.assignee?.name, ...(dropped.members || []).map((m) => m.name)].filter(Boolean)
-      Toast.show({
-        content: lost.length
-          ? `已拷贝到目标项目；${lost.join('、')} 不是该项目成员，已不保留`
-          : '已拷贝到目标项目',
-      })
-      setCopies(null)
-      onChanged?.()
-    } catch (e) {
-      Toast.show({ content: e.message })
-    }
-  }
-
   return (
     <Popup
       visible
@@ -145,13 +159,12 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
         borderTopRightRadius: 12,
         maxHeight: `calc(88vh - ${kb}px)`,
         overflowY: 'auto',
-        // 键盘弹出时抬升内容 (kb), 否则"添加子任务"输入框被键盘遮挡
         padding: `16px 16px calc(env(safe-area-inset-bottom, 0px) + 20px + ${kb}px)`,
       }}
     >
       <div className="sheet-title">{task.title}</div>
       <div className="sheet-sub">
-        {task.column?.name} · {STATUS_LABEL[task.status]}
+        {currentCol?.name} · {STATUS_LABEL[task.status]}
       </div>
 
       <div className="field">
@@ -175,6 +188,7 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
         />
       </div>
 
+      {/* 状态: 三段式, 当前项高亮, 点按即切换 */}
       <div className="field">
         <label>状态</label>
         <div className="seg">
@@ -190,6 +204,31 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
         </div>
       </div>
 
+      {/* 看板列: 点击换列, 状态随目标列联动 */}
+      <div className="field">
+        <label>看板列</label>
+        <div className="pick-row" onClick={pickColumn}>
+          <span className="pn">{currentCol?.name || '未分组'}</span>
+          <span className="link">更换 ›</span>
+        </div>
+      </div>
+
+      {/* 层级: 转为子任务 / 转为顶层 (T-ST-12) */}
+      <div className="field">
+        <label>层级</label>
+        {isSubtask ? (
+          <div className="pick-row" onClick={() => changeParent(null)}>
+            <span className="pn">子任务 · 可转为顶层任务</span>
+            <span className="link">转为顶层</span>
+          </div>
+        ) : (
+          <div className="pick-row" onClick={() => setParentPick(true)}>
+            <span className="pn">顶层任务 · 可挂到其他任务下</span>
+            <span className="link">转为子任务 ›</span>
+          </div>
+        )}
+      </div>
+
       <div className="field">
         <label>负责人</label>
         <div className="pick-row" onClick={() => setPicker('assignee')}>
@@ -216,11 +255,6 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
         </div>
       </div>
 
-      <ExtrasCard
-        extras={form.extras}
-        onChange={(next) => setForm((p) => ({ ...p, extras: next }))}
-      />
-
       <div className="section-h">子任务 <span className="tag">{subs.length}</span></div>
       {subs.map((s) => (
         <div className="pick-row" key={s.id} onClick={() => toggleSub(s)}>
@@ -238,14 +272,13 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
           onChange={(e) => setNewSub(e.target.value)}
           onKeyDown={(e) => { if (e.key === 'Enter') addSub() }}
           onFocus={(e) => {
-            // 键盘弹出动画 (~300ms) 后把输入框滚到可视区中部, 双保险防遮挡
             setTimeout(() => e.target.scrollIntoView({ block: 'center', behavior: 'smooth' }), 300)
           }}
         />
       </div>
 
       <div className="btn-primary" onClick={save}>{saving ? '保存中…' : '保存'}</div>
-      <div className="btn-ghost" onClick={openCopy}>拷贝到其他项目</div>
+      <div className="btn-ghost" onClick={() => setCopyOpen(true)}>拷贝到其他项目</div>
       <div className="btn-danger" onClick={removeTask}>
         删除任务{subs.length > 0 && <span className="del-hint">（将一并删除 {subs.length} 条子任务）</span>}
       </div>
@@ -268,22 +301,33 @@ export default function TaskDetail({ task, columns, members, onClose, onSaved, o
         onConfirm={(ids) => setForm((p) => ({ ...p, memberIds: Array.isArray(ids) ? ids : [] }))}
       />
 
+      <CopyTaskPopup
+        task={task}
+        visible={copyOpen}
+        onClose={() => setCopyOpen(false)}
+        onDone={onChanged}
+      />
+
+      {/* 转为子任务: 从项目内顶层任务中选父任务 */}
       <Popup
-        visible={!!copies}
-        onMaskClick={() => setCopies(null)}
-        bodyStyle={{ borderTopLeftRadius: 12, borderTopRightRadius: 12, padding: '16px 16px calc(env(safe-area-inset-bottom, 0px) + 20px)' }}
+        visible={parentPick}
+        onMaskClick={() => setParentPick(false)}
+        bodyStyle={{
+          borderTopLeftRadius: 12, borderTopRightRadius: 12,
+          maxHeight: '70vh', overflowY: 'auto',
+          padding: '16px 16px calc(env(safe-area-inset-bottom, 0px) + 20px)',
+        }}
       >
-        <div className="sheet-title">跨项目拷贝</div>
-        <div className="sheet-sub">源任务保持不变；新任务的创建人是你</div>
-        {(copies || []).length === 0 && <div className="extras-empty">没有其他可拷贝的项目</div>}
-        {(copies || []).map((p) => (
-          <div className="pick-row" key={p.id} onClick={() => doCopy(p.id)}>
-            <div className="avatar">{(p.name || '?').slice(0, 1)}</div>
-            <span className="pn">{p.name}</span>
-            <span className="link">拷贝</span>
+        <div className="sheet-title">转为子任务</div>
+        <div className="sheet-sub">选择父任务（仅支持一级；已有子任务的任务不能作为父任务）</div>
+        {parentCandidates.length === 0 && <div className="extras-empty">没有可选的父任务</div>}
+        {parentCandidates.map((t) => (
+          <div className="pick-row" key={t.id} onClick={() => { setParentPick(false); changeParent(t.id) }}>
+            <span className="pn">{t.title}</span>
+            <span className="link">选定</span>
           </div>
         ))}
-        <div className="btn-ghost" onClick={() => setCopies(null)}>取消</div>
+        <div className="btn-ghost" onClick={() => setParentPick(false)}>取消</div>
       </Popup>
     </Popup>
   )
diff --git a/src/styles/globals.css b/src/styles/globals.css
index 73521d5..34122b3 100644
--- a/src/styles/globals.css
+++ b/src/styles/globals.css
@@ -1143,3 +1143,16 @@ textarea.inp { resize: vertical; }
   font-size: 11.5px; color: #999; margin-top: 3px; overflow: hidden;
   text-overflow: ellipsis; white-space: nowrap;
 }
+
+/* ---- 通用分段控件 (状态选择等): 当前项高亮 ----
+   此前只有 .pv-head .seg 有定义, 详情弹层里裸用 .seg 会堆成三行 */
+.seg { display: flex; background: #f2f3f5; border-radius: 8px; padding: 3px; }
+.seg div { flex: 1; text-align: center; font-size: 13px; padding: 6px 0; border-radius: 6px; color: var(--color-muted); cursor: pointer; }
+.seg div.on { background: #fff; color: var(--color-text); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,.06); }
+
+/* ---- 看板卡片 ⋯ 菜单入口 ---- */
+.bmore-btn { margin-left: auto; color: #c2c7cf; font-size: 14px; line-height: 1; padding: 2px 4px; cursor: pointer; }
+
+/* ---- ActionSheet 标题 (任务 ⋯ 菜单) ---- */
+.as-extra { padding: 4px 0 8px; }
+.as-title { font-size: 13px; font-weight: 600; color: var(--color-text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }