diff --git a/packages/client/ui-chat/src/client/chat/ChatView.module.css b/packages/client/ui-chat/src/client/chat/ChatView.module.css
index cf0aabc7a5..086dc40ee4 100644
--- a/packages/client/ui-chat/src/client/chat/ChatView.module.css
+++ b/packages/client/ui-chat/src/client/chat/ChatView.module.css
@@ -101,13 +101,55 @@
   line-height: calc(18px + var(--dsh-content-font-delta-secondary, 0px));
 }
 
-/* Decorative whale below the last flow row while the Session runs. */
-.runningWhale {
+.running {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  --dsh-chat-flow-gap: 12px;
+  color: var(--dsw-alias-label-deep-diving);
+  font-size: calc(var(--dsh-content-font-size, 14px) - 2px);
+  line-height: calc(22px + var(--dsh-content-font-delta, 0px));
+}
+
+/* The last visible row before the status must contain output, not an input.
+   Hidden and empty seats do not separate a user message from the status. */
+.column > :nth-last-child(2 of :not([hidden]):not(.flowItem:is(:empty, :has(> [data-slot="conversation.chat.node"]:empty)))):is(
+  .flowItem:not([data-chat-flow-kind="user"]):not([data-chat-flow-kind="steering"]):not([data-chat-flow-kind="turn-trigger"]),
+  [data-chat-group-key]
+) ~ .running > .runningDivider {
+  display: block;
+}
+
+.runningDivider {
+  display: none;
+  width: 100%;
+  height: 0.5px;
+  margin: 8px 0 10px;
+  background: color-mix(in srgb, var(--dsw-alias-border-l1) 75%, var(--dsw-alias-border-l2));
+  pointer-events: none;
+}
+
+.runningContent {
+  display: inline-flex;
+  align-items: center;
+  min-width: 0;
+  gap: 6px;
+}
+
+.runningText {
+  min-width: 0;
+}
+
+.runningNumber {
+  font-family: var(--ds-font-family-code);
+  font-variant-numeric: tabular-nums;
+}
+
+.runningIcon {
   display: inline-flex;
   flex: none;
   width: calc(14px + var(--dsh-content-font-delta, 0px));
   height: calc(14px + var(--dsh-content-font-delta, 0px));
-  color: var(--dsw-alias-label-deep-diving);
 }
 
 .openError {
diff --git a/packages/client/ui-chat/src/client/chat/ChatView.tsx b/packages/client/ui-chat/src/client/chat/ChatView.tsx
index 3c9650da71..460f98b014 100644
--- a/packages/client/ui-chat/src/client/chat/ChatView.tsx
+++ b/packages/client/ui-chat/src/client/chat/ChatView.tsx
@@ -18,7 +18,7 @@ import { ChatGroupSeat } from './ChatGroupSeat.tsx'
 import { chatRenderKey } from './render-entry.ts'
 import { assertNever } from '@deepseek-ai/dsh-util-values'
 import { TurnNavigator } from './TurnNavigator.tsx'
-import { RunningWhaleTail } from './RunningWhaleTail.tsx'
+import { RunningStatus } from './RunningStatus.tsx'
 import { mergeTurnRailItems } from './turn-rail-items.ts'
 import { useChatScroll } from './use-chat-scroll.ts'
 import { fileMediaUrl, resolveWorkspacePath } from '@deepseek-ai/dsh-util-workspace-path'
@@ -112,6 +112,13 @@ export function ChatView({
   // both the data and its change signal: the array identity moves only when a
   // Turn enters, leaves, or changes its preview.
   const turnNavigationItems = useChat(s => s.navigation.items())
+  const latestTurnAnchor = turnNavigationItems.at(-1)?.anchorKey
+  const runningStartTime = useChatNode(latestTurnAnchor ?? '', (node) => {
+    const location = node?.location
+    return location?.kind === 'turn' || location?.kind === 'step'
+      ? location.turn.status === 'open' ? location.turn.start?.time : undefined
+      : undefined
+  })
   // Host-computed whole-log outline; the merge is view-layer only (the
   // conversation snapshot never carries projection values).
   const turnOutline = useProjection('turnOutline')
@@ -270,7 +277,7 @@ export function ChatView({
                 t={t}
               />
             </MarkdownDelegateProvider>
-            {running && <RunningWhaleTail />}
+            {running && <RunningStatus startTime={runningStartTime} t={t} />}
             {/* No pending placeholders: questions (ui-user-questions) and approvals
                 (ApprovalPanel) both take over the composer, so a flow card would
                 double-render the same wait. */}
diff --git a/packages/client/ui-chat/src/client/chat/RunningStatus.tsx b/packages/client/ui-chat/src/client/chat/RunningStatus.tsx
new file mode 100644
index 0000000000..c6b17921ed
--- /dev/null
+++ b/packages/client/ui-chat/src/client/chat/RunningStatus.tsx
@@ -0,0 +1,45 @@
+/** Running Turn clock isolated from the transcript's render cycle. */
+import { memo, useEffect, useState } from 'react'
+import { TextShimmer } from '@deepseek-ai/dsh-client-ui-primitives'
+import type { ChatViewSlotProps } from '../contract/slots.ts'
+import { formatLiveRunDuration, LIVE_RUN_CLOCK_INTERVAL_MS } from './message-chrome.ts'
+import { RunningWhaleTail } from './RunningWhaleTail.tsx'
+import a11yCss from './accessibility.module.css'
+import css from './ChatView.module.css'
+
+interface RunningStatusProps {
+  readonly startTime: number | undefined
+  readonly t: ChatViewSlotProps['t']
+}
+
+/**
+ * Show live elapsed time after the current Turn's content without announcing ticks.
+ * @param props - Current Turn start time and localized copy.
+ * @returns the blue running indicator; mount only while the Session is running.
+ */
+export const RunningStatus = memo(function RunningStatus({ startTime, t }: RunningStatusProps) {
+  const [now, setNow] = useState(Date.now)
+  useEffect(() => {
+    if (startTime === undefined) return
+    setNow(Date.now())
+    const timer = setInterval(() => { setNow(Date.now()) }, LIVE_RUN_CLOCK_INTERVAL_MS)
+    return () => { clearInterval(timer) }
+  }, [startTime])
+  const label = startTime === undefined ? t('chat.deepDiving') : t('chat.deepDivingFor', {
+    duration: formatLiveRunDuration(Math.max(1000, now - startTime), t),
+  })
+  return (
+    <div className={css.running} data-chat-running>
+      <span className={a11yCss.visuallyHidden} role="status" aria-live="polite" aria-atomic="true">{t('chat.deepDiving')}</span>
+      <span className={css.runningDivider} aria-hidden="true" />
+      <span className={css.runningContent}>
+        <RunningWhaleTail />
+        <span className={css.runningText}>
+          {label.split(/(\d+)/).map((part, index) => (
+            <TextShimmer key={index} active className={/^\d+$/.test(part) ? css.runningNumber : undefined}>{part}</TextShimmer>
+          ))}
+        </span>
+      </span>
+    </div>
+  )
+})
diff --git a/packages/client/ui-chat/src/client/chat/RunningWhaleTail.tsx b/packages/client/ui-chat/src/client/chat/RunningWhaleTail.tsx
index 23d4cbb4ad..19ecae8359 100644
--- a/packages/client/ui-chat/src/client/chat/RunningWhaleTail.tsx
+++ b/packages/client/ui-chat/src/client/chat/RunningWhaleTail.tsx
@@ -52,7 +52,7 @@ export function RunningWhaleTail() {
     return () => { preference.removeEventListener('change', update) }
   }, [])
   return (
-    <span className={css.runningWhale} aria-hidden="true" data-chat-running>
+    <span className={css.runningIcon} aria-hidden="true">
       <svg key={reducedMotion ? 'still' : 'animated'} width="100%" height="100%" viewBox="0 0 16 16" fill="none">
         <path d={REST_PATH} stroke="currentColor" strokeWidth={1}>
           {!reducedMotion && <animate attributeName="d" values={MOTION_PATHS} keyTimes={MOTION_TIMES}
diff --git a/packages/client/ui-chat/src/client/chat/TurnProcessNodeView.tsx b/packages/client/ui-chat/src/client/chat/TurnProcessNodeView.tsx
index 71dc44693b..d1e0fc5eae 100644
--- a/packages/client/ui-chat/src/client/chat/TurnProcessNodeView.tsx
+++ b/packages/client/ui-chat/src/client/chat/TurnProcessNodeView.tsx
@@ -1,8 +1,8 @@
-import { memo, useEffect, useState } from 'react'
+import { memo } from 'react'
 import { IconChevronDownOutlineRegular } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { ChatNodeViewProps } from '../contract/slots.ts'
 import { turnProcessAlwaysOpen } from '../contract/turn-process.ts'
-import { formatLiveRunDuration, formatRunDuration, LIVE_RUN_CLOCK_INTERVAL_MS } from './message-chrome.ts'
+import { formatRunDuration } from './message-chrome.ts'
 import a11yCss from './accessibility.module.css'
 import css from './TurnProcessNodeView.module.css'
 
@@ -15,33 +15,21 @@ export const TurnProcessNodeView = memo(function TurnProcessNodeView({
   const turn = node.location.kind === 'turn' || node.location.kind === 'step'
     ? node.location.turn
     : undefined
-  const [now, setNow] = useState(Date.now)
-  const ticking = turn?.status === 'open' && turn.start !== undefined
-  useEffect(() => {
-    if (!ticking) return
-    setNow(Date.now())
-    const timer = setInterval(() => { setNow(Date.now()) }, LIVE_RUN_CLOCK_INTERVAL_MS)
-    return () => { clearInterval(timer) }
-  }, [ticking])
-  if (turn?.start === undefined && turn?.status !== 'closed') return null
+  if (turn?.status !== 'closed') return null
   const canCollapse = turnProcess.foldable && turnProcess.hasContent && !turnProcessAlwaysOpen(node)
-  const running = turn.status === 'open'
   const reason = turn.end?.data.reason.kind
-  const elapsedMs = turn.start === undefined ? undefined
-    : Math.max(1000, (turn.end?.time ?? now) - turn.start.time)
+  const elapsedMs = turn.start === undefined || turn.end === undefined ? undefined
+    : Math.max(1000, turn.end.time - turn.start.time)
   const duration = elapsedMs === undefined ? undefined
-    : running ? formatLiveRunDuration(elapsedMs, t) : formatRunDuration(elapsedMs, t)
+    : formatRunDuration(elapsedMs, t)
   // Other end reasons retain elapsed time; only cancellation and failure replace it.
-  const label = running
-    ? duration === undefined ? t('chat.deepDiving') : t('message.turnProcess.deepDivingFor', { duration })
-    : reason === 'aborted' ? t('message.stopped')
-      : reason === 'error' ? t('message.turnProcess.failed')
-        : duration === undefined ? t('message.turnProcess.worked')
-          : t('message.turnProcess.took', { duration })
-  const announcement = running ? t('chat.deepDiving')
-    : reason === 'aborted' ? t('message.stopped')
-      : reason === 'error' ? t('message.turnProcess.failed')
-        : t('message.turnProcess.worked')
+  const label = reason === 'aborted' ? t('message.stopped')
+    : reason === 'error' ? t('message.turnProcess.failed')
+      : duration === undefined ? t('message.turnProcess.worked')
+        : t('message.turnProcess.took', { duration })
+  const announcement = reason === 'aborted' ? t('message.stopped')
+    : reason === 'error' ? t('message.turnProcess.failed')
+      : t('message.turnProcess.worked')
   return (
     <>
       <span className={a11yCss.visuallyHidden} role="status" aria-live="polite" aria-atomic="true">{announcement}</span>
diff --git a/packages/client/ui-chat/src/client/locale.ts b/packages/client/ui-chat/src/client/locale.ts
index 4e19bf91fd..aaa7517772 100644
--- a/packages/client/ui-chat/src/client/locale.ts
+++ b/packages/client/ui-chat/src/client/locale.ts
@@ -62,7 +62,6 @@ export const zh = {
   'message.trigger.plugin': '插件状态更新',
   'message.trigger.explanation': '这条通知触发了本轮回复。',
   'message.turnProcess.worked': '已完成工作',
-  'message.turnProcess.deepDivingFor': '深度求索中，用时{duration}',
   'message.turnProcess.took': '用时 {duration}',
   'message.turnProcess.failed': '处理失败',
   'view.chat': '对话',
@@ -88,6 +87,7 @@ export const zh = {
   'chat.loadOlder': '加载更早',
   'chat.toBottom': '回到底部',
   'chat.deepDiving': '深度求索中',
+  'chat.deepDivingFor': '深度求索中，用时 {duration} ···',
   'chat.turnNavigation.label': '轮次导航',
   'chat.turnNavigation.jump': '跳转到第 {turn} 轮',
   'chat.turnNavigation.jumpLoad': '加载并跳转到第 {turn} 轮',
@@ -255,7 +255,6 @@ export const en = {
   'message.trigger.plugin': 'Plugin status updated',
   'message.trigger.explanation': 'This notification triggered this response.',
   'message.turnProcess.worked': 'Worked',
-  'message.turnProcess.deepDivingFor': 'Deep diving for {duration}',
   'message.turnProcess.took': 'Took {duration}',
   'message.turnProcess.failed': 'Failed',
   'view.chat': 'Chat',
@@ -281,6 +280,7 @@ export const en = {
   'chat.loadOlder': 'Load earlier',
   'chat.toBottom': 'Back to bottom',
   'chat.deepDiving': 'Deep diving...',
+  'chat.deepDivingFor': 'Deep diving for {duration} ···',
   'chat.turnNavigation.label': 'Turn navigation',
   'chat.turnNavigation.jump': 'Jump to turn {turn}',
   'chat.turnNavigation.jumpLoad': 'Load and jump to turn {turn}',
diff --git a/packages/client/ui-chat/tests/chat-view.client.spec.tsx b/packages/client/ui-chat/tests/chat-view.client.spec.tsx
index 5eead2ddd4..ed0821c14f 100644
--- a/packages/client/ui-chat/tests/chat-view.client.spec.tsx
+++ b/packages/client/ui-chat/tests/chat-view.client.spec.tsx
@@ -505,6 +505,10 @@ function turnProcessControl(container: HTMLElement): HTMLButtonElement | null {
   return container.querySelector<HTMLButtonElement>('[data-turn-process]')
 }
 
+function runningContent(container: HTMLElement): HTMLElement | null {
+  return container.querySelector<HTMLElement>('[data-chat-running] > :last-child')
+}
+
 function withClock(time: number, run: () => void): () => void {
   return () => {
     vi.useFakeTimers()
@@ -1619,9 +1623,10 @@ describe('ChatView', () => {
     fireEvent.click(within(pendingBubble as HTMLElement).getByRole('button', { name: '复制' }))
     expect(writeText).toHaveBeenCalledWith('interrupt now')
     expect(within(pendingBubble as HTMLElement).queryByRole('button', { name: '在新对话中分支' })).toBeNull()
-    expect(turnProcessControl(view.container)?.textContent).toBe('深度求索中，用时2秒')
+    expect(turnProcessControl(view.container)).toBeNull()
+    expect(runningContent(view.container)?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
     expect(view.getByRole('status').compareDocumentPosition(view.getByText('interrupt now'))
-      & Node.DOCUMENT_POSITION_FOLLOWING).not.toBe(0)
+      & Node.DOCUMENT_POSITION_PRECEDING).not.toBe(0)
 
     act(() => {
       h.setSession({ testInbox: { 'next-turn': [queued], 'next-step': [] } })
@@ -2271,7 +2276,8 @@ describe('ChatView', () => {
     const h = makeHarness({ chat: initial }, { running: true })
     const view = render(<h.ChatView {...h.props} />)
     expect(renderedFlowKinds(view.container)).toEqual(['user', 'turn-process'])
-    expect(turnProcessControl(view.container)?.textContent).toBe('深度求索中，用时4秒')
+    expect(turnProcessControl(view.container)).toBeNull()
+    expect(runningContent(view.container)?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
     expect(view.container.querySelector('[data-chat-flow-kind="system-prompt"]')).toBeNull()
 
     act(() => {
@@ -2453,11 +2459,9 @@ describe('ChatView', () => {
       turnTimings: new Map([[1, { startTime: 0 }]]),
     })
     const view = render(<h.ChatView {...h.props} />)
-    const liveToggle = view.getByRole('button', { name: '深度求索中，用时3秒' }) as HTMLButtonElement
-    expect(liveToggle.disabled).toBe(true)
-    expect(liveToggle.getAttribute('aria-expanded')).toBe('true')
+    expect(turnProcessControl(view.container)).toBeNull()
+    expect(runningContent(view.container)?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
     const processRow = view.getByText('inspect').closest('[data-chat-flow-kind="assistant-step"]') as HTMLElement
-    fireEvent.click(liveToggle)
     expect(processRow.getAttribute('hidden')).toBeNull()
 
     act(() => {
@@ -2469,7 +2473,7 @@ describe('ChatView', () => {
       })
     })
     const toggle = turnProcessControl(view.container)!
-    expect(toggle).toBe(liveToggle)
+    expect(runningContent(view.container)).toBeNull()
     expect(toggle.textContent).toBe('用时 5秒')
     expect(toggle.disabled).toBe(false)
     expect(toggle.getAttribute('aria-expanded')).toBe('false')
@@ -3204,9 +3208,8 @@ describe('ChatView', () => {
     expect(view.getByTestId('tool-seat-r1')).toBeTruthy()
     expect(h.toolOwners[0]?.block).toMatchObject({ callId: 'r1', argsRaw: '{"command":"cmd-r1"}' })
     expect(view.getByRole('status').textContent).toBe('深度求索中')
-    const toggle = view.getByRole('button', { name: '深度求索中，用时2秒' }) as HTMLButtonElement
-    expect(toggle.disabled).toBe(true)
-    expect(toggle.getAttribute('aria-expanded')).toBe('true')
+    expect(turnProcessControl(view.container)).toBeNull()
+    expect(runningContent(view.container)?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
   }))
 
   it('keeps the Tool renderer mounted when a running call settles into log order', () => {
@@ -3265,13 +3268,13 @@ describe('ChatView', () => {
     )
     const view = render(<h.ChatView {...h.props} />)
     const status = view.getByRole('status')
-    const toggle = view.getByRole('button', { name: '深度求索中，用时2分5秒' }) as HTMLButtonElement
-    expect(toggle).toBe(turnProcessControl(view.container))
-    expect(toggle.disabled).toBe(true)
+    const content = runningContent(view.container)!
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+分\d+秒 ···$/)
+    expect(turnProcessControl(view.container)).toBeNull()
     expect(status.textContent).toBe('深度求索中')
     expect(status.getAttribute('aria-live')).toBe('polite')
     expect(status.getAttribute('aria-atomic')).toBe('true')
-    expect(toggle.closest('[aria-live]')).toBeNull()
+    expect(content.closest('[aria-live]')).toBeNull()
     expect(view.container.querySelector('[data-chat-flow-kind="assistant-step"]')).toBeNull()
     act(() => {
       h.setSession({ testInbox: { 'next-turn': [], 'next-step': [{
@@ -3281,20 +3284,22 @@ describe('ChatView', () => {
         role: 'user', source: { kind: 'user' },
       }] } })
     })
-    expect(toggle.textContent).toBe('深度求索中，用时2分5秒')
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+分\d+秒 ···$/)
+    const beforeTick = content.textContent
     act(() => { vi.advanceTimersByTime(2_000) })
-    expect(toggle.textContent).toBe('深度求索中，用时2分7秒')
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+分\d+秒 ···$/)
+    expect(content.textContent).not.toBe(beforeTick)
     expect(view.getByRole('status')).toBe(status)
     expect(status.textContent).toBe('深度求索中')
     act(() => {
       h.setSession({ testInbox: { 'next-turn': [], 'next-step': [] } })
       h.setChat({ nodes: [trigger, { ...steering(2, 'also', 1), time: 128_000 }] })
     })
-    expect(turnProcessControl(view.container)).toBe(toggle)
-    expect(toggle.textContent).toBe('深度求索中，用时2分7秒')
+    expect(runningContent(view.container)).toBe(content)
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+分\d+秒 ···$/)
     expect(view.getByText('also').closest('[data-pending-steering]')).toBeNull()
     act(() => { vi.advanceTimersByTime(1_000) })
-    expect(toggle.textContent).toBe('深度求索中，用时2分8秒')
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+分\d+秒 ···$/)
     expect(status.textContent).toBe('深度求索中')
     view.unmount()
     expect(vi.getTimerCount()).toBe(0)
@@ -3308,11 +3313,14 @@ describe('ChatView', () => {
       { running: true },
     )
     const view = render(<h.ChatView {...h.props} />)
-    const toggle = view.getByRole('button', { name: '深度求索中，用时59分59秒' })
+    const content = runningContent(view.container)!
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+分\d+秒 ···$/)
     act(() => { vi.advanceTimersByTime(1_000) })
-    expect(toggle.textContent).toBe('深度求索中，用时1小时00分0秒')
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+小时\d+分\d+秒 ···$/)
+    const hourlyText = content.textContent
     act(() => { vi.advanceTimersByTime(303_000) })
-    expect(toggle.textContent).toBe('深度求索中，用时1小时05分3秒')
+    expect(content.textContent).toMatch(/^深度求索中，用时 \d+小时\d+分\d+秒 ···$/)
+    expect(content.textContent).not.toBe(hourlyText)
     expect(view.getByRole('status').textContent).toBe('深度求索中')
     view.unmount()
     expect(vi.getTimerCount()).toBe(0)
@@ -4090,14 +4098,16 @@ describe('ChatView', () => {
     expect(failedView.container.querySelector('[data-state="error"]')).not.toBeNull()
   })
 
-  it('appends the whale below the last flow row only while the Session runs', () => {
+  it('appends the running status below the last flow row only while the Session runs', () => {
     const h = makeHarness({ nodes: [user(1, 'do the thing'), assistant(2, 'working')] }, { running: true })
     const view = render(<h.ChatView {...h.props} />)
     const column = view.container.querySelector('[data-chat-flow]')!
-    const whale = column.querySelector('[data-chat-running]')
-    expect(column.lastElementChild).toBe(whale)
-    expect(whale?.getAttribute('aria-hidden')).toBe('true')
-    expect(whale?.querySelector('animate')).not.toBeNull()
+    const status = column.querySelector('[data-chat-running]')
+    expect(column.lastElementChild).toBe(status)
+    expect(within(status as HTMLElement).getByRole('status').textContent).toBe('深度求索中')
+    expect(status?.lastElementChild?.textContent).toBe('深度求索中')
+    expect(status?.querySelector('svg')?.parentElement?.getAttribute('aria-hidden')).toBe('true')
+    expect(status?.querySelector('animate')).not.toBeNull()
     act(() => { h.setSession({ running: false }) })
     expect(column.querySelector('[data-chat-running]')).toBeNull()
   })
diff --git a/packages/client/ui-chat/tests/running-status.client.spec.tsx b/packages/client/ui-chat/tests/running-status.client.spec.tsx
new file mode 100644
index 0000000000..088fad9767
--- /dev/null
+++ b/packages/client/ui-chat/tests/running-status.client.spec.tsx
@@ -0,0 +1,68 @@
+// @vitest-environment jsdom
+
+import { act, cleanup, render } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { makeTranslate } from '@deepseek-ai/dsh-client-test-runtime'
+import { zh as commonZh } from '@deepseek-ai/dsh-client-locale/src/locales/zh.ts'
+import { RunningStatus } from '../src/client/chat/RunningStatus.tsx'
+import { zh } from '../src/client/locale.ts'
+
+const t = makeTranslate(zh, commonZh)
+
+beforeEach(() => { vi.useFakeTimers(); vi.setSystemTime(5_000) })
+afterEach(() => { cleanup(); vi.useRealTimers(); vi.restoreAllMocks(); vi.unstubAllGlobals() })
+
+function statusHarness(startTime?: number) {
+  const view = render(<RunningStatus startTime={startTime} t={t} />)
+  return {
+    ...view,
+    content: () => view.container.querySelector('[data-chat-running] > :last-child'),
+    set: (nextStartTime?: number) => { view.rerender(<RunningStatus startTime={nextStartTime} t={t} />) },
+  }
+}
+
+describe('RunningStatus', () => {
+  it('waits for an open Turn start before allocating its clock', () => {
+    const view = statusHarness()
+    expect(view.content()?.textContent).toBe('深度求索中')
+    expect(vi.getTimerCount()).toBe(0)
+    view.set(1_000)
+    expect(view.content()?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
+    expect(vi.getTimerCount()).toBe(1)
+    view.set()
+    expect(view.content()?.textContent).toBe('深度求索中')
+    expect(vi.getTimerCount()).toBe(0)
+  })
+
+  it('keeps the indicator mounted while a continuous run moves to the next Turn', () => {
+    const view = statusHarness(1_000)
+    const content = view.content()
+    const status = view.getByRole('status')
+    const initialText = content?.textContent
+    act(() => { vi.advanceTimersByTime(2_000) })
+    expect(content?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
+    expect(content?.textContent).not.toBe(initialText)
+    view.set(7_000)
+    expect(view.content()).toBe(content)
+    expect(content?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
+    expect(vi.getTimerCount()).toBe(1)
+    const nextTurnText = content?.textContent
+    act(() => { vi.advanceTimersByTime(2_000) })
+    expect(content?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
+    expect(content?.textContent).not.toBe(nextTurnText)
+    expect(view.getByRole('status')).toBe(status)
+    expect(status.textContent).toBe('深度求索中')
+    view.unmount()
+    expect(vi.getTimerCount()).toBe(0)
+  })
+
+  it('keeps the duration nonnegative when the start is ahead of the local clock', () => {
+    const view = statusHarness(6_000)
+    expect(view.content()?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
+    expect(view.content()?.textContent).not.toContain('-')
+    act(() => { vi.advanceTimersByTime(3_000) })
+    expect(view.content()?.textContent).toMatch(/^深度求索中，用时 \d+秒 ···$/)
+    expect(view.content()?.textContent).not.toContain('-')
+  })
+
+})