diff --git a/openspec/changes/add-namespace-invite-links/design.md b/openspec/changes/add-namespace-invite-links/design.md
index 27bf8ac2..29c663a8 100644
--- a/openspec/changes/add-namespace-invite-links/design.md
+++ b/openspec/changes/add-namespace-invite-links/design.md
@@ -30,3 +30,5 @@
 返回我的空间放在标题上方。普通成员不显示变更操作；角色编辑仍在角色列，保存／取消／移除使用操作列图标，提供可访问名称和悬停说明，保存成功或取消后恢复角色选择框焦点。审核状态用下拉筛选区分空间主导航。
 
 邀请生成原文仍不存服务器；创建者以 userId+slug 隔离保存在当前标签页 sessionStorage。重开及刷新时先检查 active 再预览当前 Token，成功才显示；失效／替换时清除，网络失败不展示旧缓存但可重试。跨浏览器或标签页无法恢复时明确说明，替换须确认。存储不可用时仅保留当前弹窗的内存副本并提示立即复制。
+
+邀请弹窗使用640px桌面宽度（手机为视口减32px），按邀请状态与链接、加入规则、管理操作分区。只在成功验证原邀请时展示实际到期时间；未知或失败不猜测到期时间，提供状态重试。复制为主要操作，替换和作废保留确认。
diff --git a/openspec/changes/add-namespace-invite-links/specs/namespace-invitations/spec.md b/openspec/changes/add-namespace-invite-links/specs/namespace-invitations/spec.md
index 630d0c33..98e1cc5a 100644
--- a/openspec/changes/add-namespace-invite-links/specs/namespace-invitations/spec.md
+++ b/openspec/changes/add-namespace-invite-links/specs/namespace-invitations/spec.md
@@ -128,3 +128,9 @@ API SHALL 使用 Issue #911 的路径与响应合同。
 - **AND** 无保存链接时说明限制，不自动替换邀请
 - **AND** 返回我的空间位于空间标题上方；无管理权限不显示成员变更按钮；有权限的角色保存、取消和移除放在操作列，图标有可访问名称及悬停提示
 - **AND** 审核状态采用带标签的下拉筛选，与空间主导航区分
+
+#### Scenario: 邀请弹窗提供完整状态及说明
+- **WHEN** 有权管理员打开邀请弹窗
+- **THEN** 显示目标空间及邀请有效／无有效邀请／加载／读取失败状态；可恢复原链接时显示实际到期时间及复制入口
+- **AND** 说明24小时内单次使用、MEMBER权限、先登录及现有准入规则；替换和作废操作独立于复制，并继续要求确认
+- **AND** 读取失败可重试；桌面弹窗适当增宽，手机仍可完整操作
diff --git a/web/src/features/namespace/invitation-controls.test.tsx b/web/src/features/namespace/invitation-controls.test.tsx
index 3cfecb6d..762ad856 100644
--- a/web/src/features/namespace/invitation-controls.test.tsx
+++ b/web/src/features/namespace/invitation-controls.test.tsx
@@ -33,7 +33,7 @@ describe('InvitationControls', () => {
     api.invitationStatus.mockResolvedValue({ active: true })
     const client = new QueryClient({ defaultOptions: { queries: { retry: false } } })
     render(<QueryClientProvider client={client}><InvitationControls slug="team" /></QueryClientProvider>)
-    const button = await screen.findByRole('button', { name: action === 'replace' ? 'invitation.create' : 'invitation.revoke' })
+    const button = await screen.findByRole('button', { name: action === 'replace' ? 'invitation.replaceAction' : 'invitation.revoke' })
     await waitFor(() => expect((button as HTMLButtonElement).disabled).toBe(false))
     fireEvent.click(button)
     return screen.findByRole('dialog')
@@ -60,7 +60,7 @@ describe('InvitationControls', () => {
     api.createInvitation.mockImplementation(() => new Promise(() => {}))
     const client = new QueryClient({ defaultOptions: { queries: { retry: false } } })
     render(<QueryClientProvider client={client}><InvitationControls slug="team" /></QueryClientProvider>)
-    const createButton = screen.getByRole('button', { name: 'invitation.create' })
+    const createButton = await screen.findByRole('button', { name: 'invitation.replaceAction' })
     await waitFor(() => expect((createButton as HTMLButtonElement).disabled).toBe(false))
     expect(screen.getByRole('button', { name: 'invitation.revoke' })).toBeTruthy()
 
@@ -75,7 +75,7 @@ describe('InvitationControls', () => {
     api.invitationStatus.mockResolvedValueOnce({ active: true }).mockRejectedValue(new Error('unavailable'))
     const client = new QueryClient({ defaultOptions: { queries: { retry: false } } })
     render(<QueryClientProvider client={client}><InvitationControls slug="team" /></QueryClientProvider>)
-    const createButton = screen.getByRole('button', { name: 'invitation.create' })
+    const createButton = await screen.findByRole('button', { name: 'invitation.replaceAction' })
     await waitFor(() => expect((createButton as HTMLButtonElement).disabled).toBe(false))
 
     fireEvent.click(createButton)
@@ -204,7 +204,7 @@ describe('InvitationControls', () => {
     api.createInvitation.mockResolvedValue({ token: nextToken, replaced: true })
     const view = mount()
     await screen.findByRole('textbox')
-    fireEvent.click(screen.getByRole('button', { name: 'invitation.create' }))
+    fireEvent.click(screen.getByRole('button', { name: 'invitation.replaceAction' }))
     const dialog = await screen.findByRole('dialog')
     expect(api.createInvitation).not.toHaveBeenCalled()
     expect(window.sessionStorage.getItem(storageKey)).toBe(token)
@@ -218,4 +218,32 @@ describe('InvitationControls', () => {
     expect(api.createInvitation).toHaveBeenCalledTimes(1)
   })
 
+  it('shows the verified expiration with the link and distinguishes replacement from creation', async () => {
+    window.sessionStorage.setItem(storageKey, token)
+    api.invitationStatus.mockResolvedValue({ active: true })
+    api.previewInvitation.mockResolvedValue(validPreview)
+    mount()
+    await screen.findByRole('textbox')
+    expect(screen.getByText(/invitation.expiresAtLabel/).textContent).toContain('2999')
+    expect(screen.getByRole('status').textContent).toBe('invitation.statusActive')
+    expect(screen.queryByRole('button', { name: 'invitation.create' })).toBeNull()
+    expect(screen.getByRole('button', { name: 'invitation.replaceAction' })).toBeTruthy()
+    expect(screen.getByText(/invitation.singleUse/)).toBeTruthy()
+    expect(screen.getByText('invitation.accessPolicy')).toBeTruthy()
+  })
+
+  it('retries failed validation without creating or replacing an invitation', async () => {
+    window.sessionStorage.setItem(storageKey, token)
+    api.invitationStatus.mockResolvedValue({ active: true })
+    api.previewInvitation.mockRejectedValueOnce(new ApiError('network', 0)).mockResolvedValue(validPreview)
+    mount()
+    await screen.findByRole('alert')
+    expect(screen.getByRole('status').textContent).toBe('invitation.statusError')
+    fireEvent.click(screen.getByRole('button', { name: 'invitation.retry' }))
+    expect((await screen.findByRole('textbox') as HTMLInputElement).value).toContain(token)
+    expect(screen.queryByRole('alert')).toBeNull()
+    expect(api.createInvitation).not.toHaveBeenCalled()
+    expect(api.revokeInvitation).not.toHaveBeenCalled()
+  })
+
 })
diff --git a/web/src/features/namespace/invitation-controls.tsx b/web/src/features/namespace/invitation-controls.tsx
index fe37ae60..c1ceece4 100644
--- a/web/src/features/namespace/invitation-controls.tsx
+++ b/web/src/features/namespace/invitation-controls.tsx
@@ -1,6 +1,7 @@
 import { useId, useRef, useState } from 'react'
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useTranslation } from 'react-i18next'
+import { Copy, Link2, Loader2, RefreshCw, ShieldCheck, Trash2, Users } from 'lucide-react'
 import { getAppBaseUrl, namespaceApi } from '@/api/client'
 import { useAuth } from '@/features/auth/use-auth'
 import { ApiError } from '@/shared/lib/api-error'
@@ -13,7 +14,7 @@ import { Button } from '@/shared/ui/button'
 import { Input } from '@/shared/ui/input'
 
 export function InvitationControls({ slug, compact = false }: { slug: string; compact?: boolean }) {
-  const { t } = useTranslation()
+  const { t, i18n } = useTranslation()
   const linkId = useId()
   const queryClient = useQueryClient()
   const { user } = useAuth()
@@ -33,28 +34,33 @@ export function InvitationControls({ slug, compact = false }: { slug: string; co
       const current = await namespaceApi.invitationStatus(slug)
       if (!current.active) {
         clearStoredToken()
-        return { active: false, token: null }
+        return { active: false, token: null, expiresAt: null }
       }
       let token = inMemoryToken.current?.key === storageKey ? inMemoryToken.current.token : null
       try { token = window.sessionStorage.getItem(storageKey) ?? token } catch { /* Use the current dialog's copy. */ }
-      if (!token) return { active: true, token: null }
+      if (!token) return { active: true, token: null, expiresAt: null }
+      let expiresAt: string | null = null
       try {
         const preview = await namespaceApi.previewInvitation(token)
+        expiresAt = preview.expiresAt
         if (preview.namespaceSlug !== slug || Date.parse(preview.expiresAt) <= Date.now()) {
           clearStoredToken()
-          return { active: true, token: null }
+          return { active: true, token: null, expiresAt: null }
         }
       } catch (error) {
         if (!(error instanceof ApiError) || error.status !== 404) throw error
         clearStoredToken()
-        return { active: true, token: null }
+        return { active: true, token: null, expiresAt: null }
       }
-      return { active: true, token }
+      return { active: true, token, expiresAt }
     },
   })
   const link = !status.isFetching && !status.isError && status.data?.token
     ? invitationUrl(resolvePublicRegistryUrl(getAppBaseUrl(), window.location.origin, BASE_PATH), status.data.token)
     : null
+  const expiresAt = !status.isFetching && !status.isError && status.data?.expiresAt
+    ? new Intl.DateTimeFormat(i18n?.language ?? 'zh', { dateStyle: 'medium', timeStyle: 'short' }).format(new Date(status.data.expiresAt))
+    : null
   const copyLink = async (url: string, replaced = false) => {
     try {
       await navigator.clipboard.writeText(url)
@@ -87,23 +93,55 @@ export function InvitationControls({ slug, compact = false }: { slug: string; co
     else create.mutate(false)
   }
   return (
-    <div id={compact ? undefined : 'invite'} className="space-y-2 scroll-mt-24" onClick={compact ? (event) => event.stopPropagation() : undefined}>
-      <div className="flex gap-2">
-        <Button variant="outline" size={compact ? 'sm' : 'default'} disabled={!user || (!compact && status.isPending) || status.isFetching || create.isPending} onClick={handleCreate}>{t('invitation.create')}</Button>
-        {status.data?.active ? <Button variant="outline" disabled={revoke.isPending} onClick={() => setConfirm('revoke')}>{t('invitation.revoke')}</Button> : null}
-      </div>
-      {link ? (
-        <div className="space-y-1">
-          <label className="text-sm" htmlFor={linkId}>{t('invitation.link')}</label>
-          <div className="flex gap-2">
-            <Input id={linkId} readOnly value={link} onFocus={(event) => event.currentTarget.select()} />
-            <Button variant="outline" onClick={() => void copyLink(link)}>{t('invitation.copy')}</Button>
+    <div id={compact ? undefined : 'invite'} className="space-y-5 scroll-mt-24" onClick={compact ? (event) => event.stopPropagation() : undefined}>
+      {!compact ? (
+        <div className="rounded-xl border bg-secondary/30 p-4">
+          <div className="flex flex-wrap items-center justify-between gap-3">
+            <span className="flex items-center gap-2 font-medium"><Link2 className="h-4 w-4" aria-hidden="true" />{t('invitation.link')}</span>
+            <span role="status" className="inline-flex items-center gap-1.5 rounded-full bg-background px-3 py-1 text-xs font-medium">
+              {status.isFetching ? <Loader2 className="h-3 w-3 animate-spin" aria-hidden="true" /> : null}
+              {t(status.isError ? 'invitation.statusError' : status.isFetching ? 'invitation.statusLoading' : status.data?.active ? 'invitation.statusActive' : 'invitation.statusInactive')}
+            </span>
+          </div>
+          {link ? (
+            <div className="mt-4 space-y-2">
+              <label className="sr-only" htmlFor={linkId}>{t('invitation.link')}</label>
+              <div className="flex flex-col gap-2 sm:flex-row">
+                <Input id={linkId} className="min-w-0 flex-1 bg-background font-mono text-xs" readOnly value={link} onFocus={(event) => event.currentTarget.select()} />
+                <Button className="shrink-0" onClick={() => void copyLink(link)}><Copy className="mr-2 h-4 w-4" aria-hidden="true" />{t('invitation.copy')}</Button>
+              </div>
+              {expiresAt ? <p className="text-xs text-muted-foreground">{t('invitation.expiresAtLabel')}: {expiresAt}</p> : null}
+              <p className="text-xs leading-relaxed text-muted-foreground">{t(storageUnavailable ? 'invitation.storageUnavailable' : 'invitation.localLinkHint')}</p>
+            </div>
+          ) : null}
+          {!link && !status.isFetching && !status.isError && status.data?.active ? <p className="mt-3 text-sm leading-relaxed text-muted-foreground">{t('invitation.activeUnavailable')}</p> : null}
+          {!status.isError && !status.data?.active ? (
+            <div className="mt-4"><Button disabled={!user || status.isPending || status.isFetching || create.isPending} onClick={handleCreate}><Link2 className="mr-2 h-4 w-4" aria-hidden="true" />{t('invitation.create')}</Button></div>
+          ) : null}
+        </div>
+      ) : <Button variant="outline" size="sm" disabled={!user || status.isFetching || create.isPending} onClick={handleCreate}>{t('invitation.create')}</Button>}
+      {!compact ? (
+        <div className="space-y-3 text-sm">
+          <p className="font-medium">{t('invitation.detailsTitle')}</p>
+          <div className="flex gap-3"><Users className="mt-0.5 h-4 w-4 shrink-0 text-muted-foreground" aria-hidden="true" /><p className="leading-relaxed text-muted-foreground">{t('invitation.singleUse')} {t('invitation.memberAccess')}</p></div>
+          <div className="flex gap-3"><ShieldCheck className="mt-0.5 h-4 w-4 shrink-0 text-muted-foreground" aria-hidden="true" /><p className="leading-relaxed text-muted-foreground">{t('invitation.accessPolicy')}</p></div>
+        </div>
+      ) : null}
+      {(create.error || revoke.error || status.error) ? (
+        <div className="flex flex-wrap items-center justify-between gap-2 rounded-lg border border-destructive/20 bg-destructive/5 p-3">
+          <p role="alert" className="text-sm text-destructive">{t('invitation.error')}</p>
+          {status.error ? <Button variant="outline" size="sm" disabled={status.isFetching} onClick={() => void status.refetch()}><RefreshCw className="mr-2 h-4 w-4" aria-hidden="true" />{t('invitation.retry')}</Button> : null}
+        </div>
+      ) : null}
+      {!compact && !status.isError && status.data?.active ? (
+        <div className="flex flex-wrap items-center justify-between gap-3 border-t pt-4">
+          <span className="text-xs text-muted-foreground">{t('invitation.managementTitle')}</span>
+          <div className="flex flex-wrap gap-2">
+            <Button variant="outline" disabled={!user || status.isFetching || create.isPending || revoke.isPending} onClick={handleCreate}><RefreshCw className="mr-2 h-4 w-4" aria-hidden="true" />{t('invitation.replaceAction')}</Button>
+            <Button variant="ghost" className="text-destructive hover:bg-destructive/10 hover:text-destructive" disabled={status.isFetching || revoke.isPending || create.isPending} onClick={() => setConfirm('revoke')}><Trash2 className="mr-2 h-4 w-4" aria-hidden="true" />{t('invitation.revoke')}</Button>
           </div>
-          <p className="text-xs text-muted-foreground">{t(storageUnavailable ? 'invitation.storageUnavailable' : 'invitation.localLinkHint')}</p>
         </div>
       ) : null}
-      {!link && !status.isFetching && !status.isError && status.data?.active ? <p className="text-sm text-muted-foreground">{t('invitation.activeUnavailable')}</p> : null}
-      {(create.error || revoke.error || status.error) ? <p role="alert" className="text-sm text-destructive">{t('invitation.error')}</p> : null}
       <ConfirmDialog open={confirm !== null} onOpenChange={(open) => { if (!open) setConfirm(null) }}
         title={t(confirm === 'revoke' ? 'invitation.revokeTitle' : 'invitation.replaceTitle')}
         description={t(confirm === 'revoke' ? 'invitation.revokeDescription' : 'invitation.replaceDescription')}
diff --git a/web/src/i18n/locales/en.json b/web/src/i18n/locales/en.json
index f89f70cb..2f91cc42 100644
--- a/web/src/i18n/locales/en.json
+++ b/web/src/i18n/locales/en.json
@@ -1406,7 +1406,6 @@
     "invalid": "This invitation link is invalid or expired. Ask a space admin for a new link.",
     "loading": "Checking invitation…",
     "networkError": "Connection failed. Try again.",
-    "retry": "Retry",
     "namespace": "Space: {{name}}",
     "account": "Current account: {{name}}",
     "permissions": "Confirm to join as MEMBER. You can access space resources and publish skills.",
@@ -1416,7 +1415,19 @@
     "activeUnavailable": "The invitation is active, but this tab has no saved link. Copy it from the tab that created it, or confirm creating a replacement to invalidate the old link.",
     "localLinkHint": "The link is saved only for this account in this browser tab; one new member can use it within 24 hours.",
     "copy": "Copy link",
-    "storageUnavailable": "Your browser could not save the link. Copy it now; it cannot be restored after closing this dialog or refreshing."
+    "storageUnavailable": "Your browser could not save the link. Copy it now; it cannot be restored after closing this dialog or refreshing.",
+    "statusLoading": "Checking invitation status",
+    "statusActive": "Invitation active",
+    "statusInactive": "No active invitation",
+    "detailsTitle": "How joining works",
+    "singleUse": "One new member can use this invitation within 24 hours.",
+    "memberAccess": "The recipient joins as a member and can access skills shared with this space.",
+    "accessPolicy": "The recipient must sign in and meet existing admission rules. Opening the link does not join automatically.",
+    "replaceAction": "Replace invitation link",
+    "managementTitle": "Manage invitation",
+    "retry": "Refresh status",
+    "expiresAtLabel": "Expires at",
+    "statusError": "Unable to check invitation status"
   },
   "members": {
     "title": "Member Management",
diff --git a/web/src/i18n/locales/ru.json b/web/src/i18n/locales/ru.json
index 39371feb..528981dd 100644
--- a/web/src/i18n/locales/ru.json
+++ b/web/src/i18n/locales/ru.json
@@ -1471,7 +1471,6 @@
     "invalid": "Ссылка-приглашение недействительна или истекла. Запросите новую ссылку у администратора.",
     "loading": "Проверка приглашения…",
     "networkError": "Ошибка соединения. Попробуйте ещё раз.",
-    "retry": "Повторить",
     "namespace": "Пространство: {{name}}",
     "account": "Текущая учётная запись: {{name}}",
     "permissions": "Подтвердите вступление с ролью MEMBER. Вы сможете просматривать ресурсы и публиковать навыки.",
@@ -1481,7 +1480,19 @@
     "activeUnavailable": "Приглашение активно, но ссылка не сохранена в этой вкладке. Скопируйте её из вкладки, в которой создали приглашение, или подтвердите замену ссылки.",
     "localLinkHint": "Ссылка сохранена только для текущего аккаунта в этой вкладке; один новый участник может использовать её в течение 24 часов.",
     "copy": "Копировать ссылку",
-    "storageUnavailable": "Браузер не смог сохранить ссылку. Скопируйте её сейчас; после закрытия окна или обновления восстановить её не получится."
+    "storageUnavailable": "Браузер не смог сохранить ссылку. Скопируйте её сейчас; после закрытия окна или обновления восстановить её не получится.",
+    "statusLoading": "Проверка приглашения",
+    "statusActive": "Приглашение активно",
+    "statusInactive": "Нет активного приглашения",
+    "detailsTitle": "Правила вступления",
+    "singleUse": "Приглашение действует 24 часа и доступно одному новому участнику.",
+    "memberAccess": "Получатель становится участником и получает доступ к навыкам пространства, доступным участникам.",
+    "accessPolicy": "Получатель должен войти и пройти действующие правила допуска. Открытие ссылки не добавляет его автоматически.",
+    "replaceAction": "Заменить ссылку приглашения",
+    "managementTitle": "Управление приглашением",
+    "retry": "Обновить статус",
+    "expiresAtLabel": "Истекает",
+    "statusError": "Не удалось проверить статус приглашения"
   },
   "members": {
     "title": "Управление участниками",
diff --git a/web/src/i18n/locales/zh.json b/web/src/i18n/locales/zh.json
index 36f2369c..b18d75a5 100644
--- a/web/src/i18n/locales/zh.json
+++ b/web/src/i18n/locales/zh.json
@@ -1406,7 +1406,6 @@
     "invalid": "邀请链接无效或已失效，请联系空间管理员获取新链接。",
     "loading": "正在核对邀请…",
     "networkError": "连接失败，请重试。",
-    "retry": "重试",
     "namespace": "目标空间：{{name}}",
     "account": "当前账号：{{name}}",
     "permissions": "确认后，你将以 MEMBER 身份加入，可访问空间资源并发布技能。",
@@ -1416,7 +1415,19 @@
     "activeUnavailable": "当前邀请仍有效，但此标签页没有保存完整链接。可在创建链接的标签页复制，或确认生成新链接使旧链接失效。",
     "localLinkHint": "链接仅保存在当前账号的这个浏览器标签页；24 小时内可供一名新成员使用。",
     "copy": "复制链接",
-    "storageUnavailable": "浏览器未能保存链接，请现在复制；关闭此窗口或刷新后将无法恢复。"
+    "storageUnavailable": "浏览器未能保存链接，请现在复制；关闭此窗口或刷新后将无法恢复。",
+    "statusLoading": "正在获取邀请状态",
+    "statusActive": "邀请有效",
+    "statusInactive": "暂无有效邀请",
+    "detailsTitle": "加入规则",
+    "singleUse": "单次邀请：仅限一名新成员使用，有效期 24 小时。",
+    "memberAccess": "加入后获得成员权限，可访问空间内对成员开放的技能。",
+    "accessPolicy": "对方须先登录并通过平台现有准入，打开链接不会自动加入。",
+    "replaceAction": "替换邀请链接",
+    "managementTitle": "管理邀请",
+    "retry": "重新获取状态",
+    "expiresAtLabel": "到期时间",
+    "statusError": "邀请状态获取失败"
   },
   "members": {
     "title": "成员管理",
diff --git a/web/src/pages/dashboard/namespace-members.tsx b/web/src/pages/dashboard/namespace-members.tsx
index 14f78e71..dfab9b88 100644
--- a/web/src/pages/dashboard/namespace-members.tsx
+++ b/web/src/pages/dashboard/namespace-members.tsx
@@ -180,9 +180,9 @@ export function NamespaceMembersPage() {
           {canManageMembers ? (
             <Dialog>
               <DialogTrigger asChild><Button variant="outline">{t('namespaceManagement.invite')}</Button></DialogTrigger>
-              <DialogContent>
+              <DialogContent className="w-[min(calc(100vw-2rem),40rem)] gap-5 p-5 sm:p-6">
                 <DialogTitle>{t('namespaceManagement.invite')}</DialogTitle>
-                <DialogDescription>{t('invitation.linkHint')}</DialogDescription>
+                <DialogDescription className="break-words">{namespace.displayName} <span className="text-muted-foreground">@{slug}</span></DialogDescription>
                 <InvitationControls slug={slug} />
               </DialogContent>
             </Dialog>