diff --git a/fe-user/src/App.tsx b/fe-user/src/App.tsx
index f2f5007..7539cb1 100644
--- a/fe-user/src/App.tsx
+++ b/fe-user/src/App.tsx
@@ -11,6 +11,7 @@ import { ContractDetailPage } from '@/pages/contracts/ContractDetailPage'
 import { MyContractsPage } from '@/pages/contracts/MyContractsPage'
 import { PurchaseEvaluationsListPage, PurchaseEvaluationDetailPage } from '@/pages/pe/PurchaseEvaluationsListPage'
 import { PurchaseEvaluationCreatePage } from '@/pages/pe/PurchaseEvaluationCreatePage'
+import { PurchaseEvaluationWorkspacePage } from '@/pages/pe/PurchaseEvaluationWorkspacePage'
 import { BudgetsListPage, BudgetDetailPage } from '@/pages/budgets/BudgetsListPage'
 import { BudgetCreatePage } from '@/pages/budgets/BudgetCreatePage'
 
@@ -33,6 +34,7 @@ function App() {
             <Route path="/contracts/:id" element={<ContractDetailPage />} />
             <Route path="/my-contracts" element={<MyContractsPage />} />
             <Route path="/purchase-evaluations" element={<PurchaseEvaluationsListPage />} />
+            <Route path="/purchase-evaluations/workspace" element={<PurchaseEvaluationWorkspacePage />} />
             <Route path="/purchase-evaluations/new" element={<PurchaseEvaluationCreatePage />} />
             <Route path="/purchase-evaluations/:id" element={<PurchaseEvaluationDetailPage />} />
             <Route path="/budgets" element={<BudgetsListPage />} />
diff --git a/fe-user/src/components/Layout.tsx b/fe-user/src/components/Layout.tsx
index 28ec8fe..7db7f1a 100644
--- a/fe-user/src/components/Layout.tsx
+++ b/fe-user/src/components/Layout.tsx
@@ -81,7 +81,10 @@ function resolvePath(key: string): string | null {
     const typeInt = PE_CODE_TO_INT[code]
     if (!typeInt) return null
     if (action === 'List') return `/purchase-evaluations?type=${typeInt}`
-    if (action === 'Create') return `/purchase-evaluations/new?type=${typeInt}`
+    // "Thao tác" leaf → workspace 2-panel (Q4 2026-05-07): pick + create + sửa
+    // tables inline. Header-only `/new` page giữ tồn tại cho deep-link cũ
+    // (PeDetailTabs "Sửa header" button vẫn navigate sang đó).
+    if (action === 'Create') return `/purchase-evaluations/workspace?type=${typeInt}`
     if (action === 'Pending') return `/purchase-evaluations?type=${typeInt}&pendingMe=1`
   }
   return null
diff --git a/fe-user/src/components/pe/PeDetailTabs.tsx b/fe-user/src/components/pe/PeDetailTabs.tsx
index ec81f72..1e81ed9 100644
--- a/fe-user/src/components/pe/PeDetailTabs.tsx
+++ b/fe-user/src/components/pe/PeDetailTabs.tsx
@@ -38,20 +38,32 @@ const fmtMoney = (v: number) => v.toLocaleString('vi-VN')
 
 // Main detail content — flat render 3 section không tabs.
 // Tên giữ PeDetailTabs để không break callsite (rename gây churn).
+//
+// `mode` (2026-05-07):
+//  - 'detail' (default): full UX — Section 5 Ý kiến 4PB editable theo readOnly.
+//    Dùng ở leaf "Danh sách" + "Duyệt" (3-panel pages).
+//  - 'workspace': dùng ở leaf "Thao tác" (2-panel workspace). Section 5 LUÔN
+//    disabled (Q5 user — ý kiến nhập khi duyệt, không phải workspace nhập liệu).
+//    Workflow Panel + Approvals + History KHÔNG render trong PeDetailTabs (luôn
+//    ở caller PeWorkflowPanel — workspace caller skip render Panel 3 hoàn toàn).
 export function PeDetailTabs({
   evaluation,
   onBack,
   onDelete,
   readOnly = false,
+  mode = 'detail',
 }: {
   evaluation: PeDetailBundle
   onBack: () => void
   onDelete: () => void
   /** Menu "Duyệt" (pendingMe=1) — ẩn mọi action thêm/sửa/xóa, chỉ xem + duyệt phase. */
   readOnly?: boolean
+  /** 'workspace' = Section 5 LUÔN disabled (ý kiến nhập ở leaf Duyệt). */
+  mode?: 'detail' | 'workspace'
 }) {
   const navigate = useNavigate()
   const isDraft = evaluation.phase === PurchaseEvaluationPhase.DangSoanThao
+  const opinionsReadOnly = readOnly || mode === 'workspace'
 
   return (
     <div className="rounded-lg border border-slate-200 bg-white shadow-sm">
@@ -112,7 +124,12 @@ export function PeDetailTabs({
           <ItemsTab ev={evaluation} readOnly={readOnly} />
         </Section>
         <Section title="5. Ý kiến 4 phòng ban (sign-off)">
-          <DepartmentOpinionsSection ev={evaluation} readOnly={readOnly} />
+          {mode === 'workspace' && (
+            <div className="mb-3 rounded border border-amber-200 bg-amber-50 px-3 py-2 text-[12px] text-amber-800">
+              Ý kiến + chữ ký nhập khi duyệt phiếu — vào menu &ldquo;Duyệt&rdquo; để ký.
+            </div>
+          )}
+          <DepartmentOpinionsSection ev={evaluation} readOnly={opinionsReadOnly} />
         </Section>
       </div>
     </div>
diff --git a/fe-user/src/components/pe/PeHeaderForm.tsx b/fe-user/src/components/pe/PeHeaderForm.tsx
new file mode 100644
index 0000000..62312cd
--- /dev/null
+++ b/fe-user/src/components/pe/PeHeaderForm.tsx
@@ -0,0 +1,223 @@
+// Header form cho phiếu Duyệt NCC — tách từ PurchaseEvaluationCreatePage để
+// reuse trong Workspace mode "new". Sửa header sau khi tạo vẫn redirect về
+// page Create cũ (`/purchase-evaluations/new?id=`) — workspace KHÔNG re-edit
+// header.
+import { useEffect, useState } from 'react'
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
+import { toast } from 'sonner'
+import { Button } from '@/components/ui/Button'
+import { Input } from '@/components/ui/Input'
+import { Label } from '@/components/ui/Label'
+import { Select } from '@/components/ui/Select'
+import { Textarea } from '@/components/ui/Textarea'
+import { api } from '@/lib/api'
+import { getErrorMessage } from '@/lib/apiError'
+import {
+  PurchaseEvaluationType,
+  PurchaseEvaluationTypeLabel,
+  type PeDetailBundle,
+} from '@/types/purchaseEvaluation'
+import { BudgetPhase, type BudgetListItem } from '@/types/budget'
+import type { Paged, Project } from '@/types/master'
+
+export function PeHeaderForm({
+  editId,
+  defaultType,
+  onSaved,
+  onCancel,
+}: {
+  editId?: string | null
+  defaultType?: number
+  /** Gọi sau khi save thành công với (newId, type). Caller decide navigation. */
+  onSaved: (id: string, type: number) => void
+  onCancel?: () => void
+}) {
+  const qc = useQueryClient()
+  const initialType = defaultType ?? PurchaseEvaluationType.DuyetNcc
+
+  const projects = useQuery({
+    queryKey: ['all-projects'],
+    queryFn: async () => (await api.get<{ items: Project[] }>('/projects', { params: { pageSize: 1000 } })).data.items,
+  })
+  const existing = useQuery({
+    queryKey: ['pe-detail', editId],
+    queryFn: async () => (await api.get<PeDetailBundle>(`/purchase-evaluations/${editId}`)).data,
+    enabled: !!editId,
+  })
+
+  const [form, setForm] = useState({
+    type: initialType as number,
+    tenGoiThau: '',
+    projectId: '',
+    diaDiem: '',
+    moTa: '',
+    paymentTerms: '',
+    budgetId: '' as string,
+  })
+
+  const eligibleBudgets = useQuery({
+    queryKey: ['eligible-budgets', form.projectId],
+    queryFn: async () => {
+      const res = await api.get<Paged<BudgetListItem>>('/budgets', {
+        params: { pageSize: 100, projectId: form.projectId, phase: BudgetPhase.DaDuyet },
+      })
+      return res.data.items
+    },
+    enabled: !!form.projectId,
+  })
+
+  useEffect(() => {
+    if (existing.data) {
+      setForm({
+        type: existing.data.type,
+        tenGoiThau: existing.data.tenGoiThau,
+        projectId: existing.data.projectId,
+        diaDiem: existing.data.diaDiem ?? '',
+        moTa: existing.data.moTa ?? '',
+        paymentTerms: existing.data.paymentTerms ?? '',
+        budgetId: existing.data.budgetId ?? '',
+      })
+    }
+  }, [existing.data])
+
+  const mut = useMutation({
+    mutationFn: async () => {
+      if (editId) {
+        return api.put(`/purchase-evaluations/${editId}`, {
+          id: editId,
+          tenGoiThau: form.tenGoiThau,
+          diaDiem: form.diaDiem || null,
+          moTa: form.moTa || null,
+          paymentTerms: form.paymentTerms || null,
+          budgetId: form.budgetId || null,
+        })
+      }
+      return api.post<{ id: string }>('/purchase-evaluations', {
+        type: form.type,
+        tenGoiThau: form.tenGoiThau,
+        projectId: form.projectId,
+        diaDiem: form.diaDiem || null,
+        moTa: form.moTa || null,
+        paymentTerms: form.paymentTerms || null,
+        budgetId: form.budgetId || null,
+      })
+    },
+    onSuccess: res => {
+      toast.success(editId ? 'Đã lưu.' : 'Đã tạo phiếu.')
+      qc.invalidateQueries({ queryKey: ['pe-list'] })
+      const id = editId ?? (res as { data: { id: string } }).data.id
+      onSaved(id, form.type)
+    },
+    onError: e => toast.error(getErrorMessage(e)),
+  })
+
+  return (
+    <div className="max-w-2xl space-y-4 rounded-lg border border-slate-200 bg-white p-6 shadow-sm">
+      <header>
+        <h2 className="text-base font-semibold tracking-tight text-slate-900">
+          {editId ? 'Sửa header phiếu' : 'Tạo phiếu Duyệt NCC mới'}
+        </h2>
+        <p className="mt-0.5 text-[12px] text-slate-500">
+          {editId
+            ? 'Chỉ sửa các field thông tin chung — NCC + báo giá + ý kiến nhập ở Panel chi tiết.'
+            : 'Tạo header trước, sau đó nhập NCC + Báo giá + Hạng mục ở Panel chi tiết.'}
+        </p>
+      </header>
+
+      <div>
+        <Label>Loại quy trình</Label>
+        <Select
+          value={form.type}
+          disabled={!!editId}
+          onChange={e => setForm({ ...form, type: Number(e.target.value) })}
+        >
+          {Object.values(PurchaseEvaluationType).map(t => (
+            <option key={t} value={t}>{PurchaseEvaluationTypeLabel[t]}</option>
+          ))}
+        </Select>
+      </div>
+
+      <div>
+        <Label>Tên gói thầu *</Label>
+        <Input
+          value={form.tenGoiThau}
+          onChange={e => setForm({ ...form, tenGoiThau: e.target.value })}
+          placeholder="vd Cung cấp bê tông"
+        />
+      </div>
+
+      <div>
+        <Label>Dự án *</Label>
+        <Select
+          value={form.projectId}
+          disabled={!!editId}
+          onChange={e => setForm({ ...form, projectId: e.target.value })}
+        >
+          <option value="">-- Chọn --</option>
+          {projects.data?.map(p => (
+            <option key={p.id} value={p.id}>{p.code} — {p.name}</option>
+          ))}
+        </Select>
+      </div>
+
+      <div>
+        <Label>Ngân sách (đối chiếu chi phí)</Label>
+        <Select
+          value={form.budgetId}
+          disabled={!form.projectId}
+          onChange={e => setForm({ ...form, budgetId: e.target.value })}
+        >
+          <option value="">— (không link)</option>
+          {eligibleBudgets.data?.map(b => (
+            <option key={b.id} value={b.id}>
+              {b.maNganSach ?? '—'} · {b.tenNganSach} · {b.tongNganSach.toLocaleString('vi-VN')} đ
+            </option>
+          ))}
+        </Select>
+        <p className="mt-1 text-[11px] text-slate-500">
+          {!form.projectId
+            ? 'Chọn dự án trước để xem ngân sách khả dụng.'
+            : eligibleBudgets.data && eligibleBudgets.data.length === 0
+            ? 'Dự án này chưa có ngân sách đã duyệt.'
+            : 'Chỉ list ngân sách đã duyệt cùng dự án.'}
+        </p>
+      </div>
+
+      <div>
+        <Label>Địa điểm</Label>
+        <Input
+          value={form.diaDiem}
+          onChange={e => setForm({ ...form, diaDiem: e.target.value })}
+          placeholder="Lô K, KCN Lộc An - Bình Sơn..."
+        />
+      </div>
+
+      <div>
+        <Label>Mô tả</Label>
+        <Textarea rows={3} value={form.moTa} onChange={e => setForm({ ...form, moTa: e.target.value })} />
+      </div>
+
+      <div>
+        <Label>Điều khoản thanh toán (JSON hoặc text)</Label>
+        <Textarea
+          rows={3}
+          value={form.paymentTerms}
+          onChange={e => setForm({ ...form, paymentTerms: e.target.value })}
+          placeholder='{"tamUng":"10%","thanhToanTam":"100% W.done","quyetToan":"Final Account","baoHanh":"5%"}'
+        />
+      </div>
+
+      <div className="flex justify-end gap-2">
+        {onCancel && (
+          <Button variant="ghost" onClick={onCancel}>Hủy</Button>
+        )}
+        <Button
+          onClick={() => mut.mutate()}
+          disabled={!form.tenGoiThau || !form.projectId || mut.isPending}
+        >
+          {editId ? 'Lưu' : 'Tạo phiếu'}
+        </Button>
+      </div>
+    </div>
+  )
+}
diff --git a/fe-user/src/components/pe/PeListPanel.tsx b/fe-user/src/components/pe/PeListPanel.tsx
new file mode 100644
index 0000000..9321f82
--- /dev/null
+++ b/fe-user/src/components/pe/PeListPanel.tsx
@@ -0,0 +1,184 @@
+// Pure picker panel cho workspace 2-panel "Thao tác" (Pe_*_Create leaf).
+// KHÔNG có inline Edit/Delete (per Q1 user 2026-05-07): chỉ click để pick, +
+// optional sticky bottom "+ Thêm mới" button khi showCreateButton=true.
+//
+// Reuse-able: caller quản URL state qua props (search/phase/typeFilter), panel
+// chỉ render + invoke callbacks. Pendingme vẫn truyền được nếu cần dùng cho
+// inbox view khác (hiện chỉ workspace dùng pendingMe=false).
+import { useQuery } from '@tanstack/react-query'
+import { ClipboardCheck, Plus, Search } from 'lucide-react'
+import { Button } from '@/components/ui/Button'
+import { Input } from '@/components/ui/Input'
+import { Select } from '@/components/ui/Select'
+import { EmptyState } from '@/components/EmptyState'
+import { SlaTimer } from '@/components/SlaTimer'
+import { api } from '@/lib/api'
+import { cn } from '@/lib/cn'
+import type { Paged } from '@/types/master'
+import {
+  PurchaseEvaluationPhase,
+  PurchaseEvaluationPhaseColor,
+  PurchaseEvaluationPhaseLabel,
+  PurchaseEvaluationTypeLabel,
+  type PeListItem,
+} from '@/types/purchaseEvaluation'
+
+export function PeListPanel({
+  typeFilter,
+  pendingMe = false,
+  selectedId,
+  search,
+  phase,
+  onSelect,
+  onSearchChange,
+  onPhaseChange,
+  showCreateButton = false,
+  onCreate,
+}: {
+  typeFilter: number | null
+  pendingMe?: boolean
+  selectedId: string | null
+  search: string
+  phase: string
+  onSelect: (id: string) => void
+  onSearchChange: (q: string) => void
+  onPhaseChange: (p: string) => void
+  showCreateButton?: boolean
+  onCreate?: () => void
+}) {
+  const list = useQuery({
+    queryKey: ['pe-list', { typeFilter, pendingMe, search, phase }],
+    queryFn: async () => {
+      if (pendingMe) {
+        const res = await api.get<PeListItem[]>('/purchase-evaluations/inbox', {
+          params: { type: typeFilter ?? undefined },
+        })
+        return { items: res.data, total: res.data.length, page: 1, pageSize: res.data.length }
+      }
+      const res = await api.get<Paged<PeListItem>>('/purchase-evaluations', {
+        params: {
+          pageSize: 50,
+          search: search || undefined,
+          type: typeFilter ?? undefined,
+          phase: phase || undefined,
+        },
+      })
+      return res.data
+    },
+  })
+
+  const rows = list.data?.items ?? []
+
+  return (
+    <aside className="flex flex-col overflow-hidden border-r border-slate-200 bg-white">
+      {/* Header — count + filter */}
+      <div className="space-y-2 border-b border-slate-200 p-3">
+        <div className="flex items-center justify-between">
+          <div className="text-[11px] font-semibold uppercase tracking-wide text-slate-500">
+            Danh sách phiếu
+          </div>
+          <span className="rounded-full bg-slate-100 px-2 py-0.5 text-[11px] font-medium text-slate-600">
+            {list.data?.total ?? 0}
+          </span>
+        </div>
+        <div className="relative">
+          <Search className="pointer-events-none absolute left-2.5 top-2.5 h-4 w-4 text-slate-400" />
+          <Input
+            value={search}
+            onChange={e => onSearchChange(e.target.value)}
+            placeholder="Tìm mã / tên gói thầu / dự án…"
+            className="pl-8"
+          />
+        </div>
+        <Select value={phase} onChange={e => onPhaseChange(e.target.value)}>
+          <option value="">Tất cả phase</option>
+          {Object.values(PurchaseEvaluationPhase).map(p => (
+            <option key={p} value={p}>{PurchaseEvaluationPhaseLabel[p]}</option>
+          ))}
+        </Select>
+      </div>
+
+      {/* List body */}
+      <div className="flex-1 overflow-y-auto">
+        {list.isLoading && (
+          <div className="space-y-2 p-3">
+            {Array.from({ length: 6 }).map((_, i) => (
+              <div key={i} className="h-16 animate-pulse rounded-md bg-slate-100" />
+            ))}
+          </div>
+        )}
+        {!list.isLoading && rows.length === 0 && (
+          <div className="p-6">
+            <EmptyState
+              icon={ClipboardCheck}
+              title="Chưa có phiếu"
+              description={
+                showCreateButton
+                  ? 'Bấm + Thêm mới ở dưới để tạo phiếu đầu tiên.'
+                  : 'Chưa có phiếu nào khớp bộ lọc.'
+              }
+            />
+          </div>
+        )}
+        <ul className="divide-y divide-slate-100">
+          {rows.map(p => (
+            <li key={p.id}>
+              <button
+                onClick={() => onSelect(p.id)}
+                className={cn(
+                  'block w-full px-3 py-2.5 text-left transition hover:bg-slate-50',
+                  selectedId === p.id && 'bg-brand-50 ring-1 ring-inset ring-brand-200',
+                )}
+              >
+                <div className="flex items-start justify-between gap-2">
+                  <div className="min-w-0 flex-1">
+                    <div className="truncate text-[13px] font-medium text-slate-900">{p.tenGoiThau}</div>
+                    <div className="mt-0.5 flex items-center gap-1.5 text-[11px] text-slate-500">
+                      <span className="font-mono">{p.maPhieu ?? '—'}</span>
+                      <span>·</span>
+                      <span className="truncate">{p.projectName}</span>
+                    </div>
+                    {p.selectedSupplierName && (
+                      <div className="mt-0.5 truncate text-[11px] text-emerald-600">
+                        ✓ {p.selectedSupplierName}
+                      </div>
+                    )}
+                  </div>
+                  <span
+                    className={cn(
+                      'shrink-0 rounded px-1.5 py-0.5 text-[10px] font-medium',
+                      PurchaseEvaluationPhaseColor[p.phase],
+                    )}
+                  >
+                    {PurchaseEvaluationPhaseLabel[p.phase]}
+                  </span>
+                </div>
+                <div className="mt-1 flex items-center justify-between text-[11px] text-slate-500">
+                  <span className="rounded bg-slate-100 px-1.5 py-0.5 text-slate-600">
+                    {PurchaseEvaluationTypeLabel[p.type]}
+                  </span>
+                  <SlaTimer deadline={p.slaDeadline} createdAt={p.createdAt} />
+                </div>
+                {p.contractId && (
+                  <div className="mt-1 text-[10px] text-brand-600">✓ Đã tạo HĐ</div>
+                )}
+              </button>
+            </li>
+          ))}
+        </ul>
+      </div>
+
+      {/* Sticky bottom — "+ Thêm mới" button (mirror HĐ Thầu phụ pattern) */}
+      {showCreateButton && (
+        <div className="border-t border-slate-200 bg-white p-2">
+          <Button
+            onClick={() => onCreate?.()}
+            className="w-full justify-center gap-1.5 text-xs"
+          >
+            <Plus className="h-3.5 w-3.5" /> Thêm mới
+          </Button>
+        </div>
+      )}
+    </aside>
+  )
+}
diff --git a/fe-user/src/pages/pe/PurchaseEvaluationWorkspacePage.tsx b/fe-user/src/pages/pe/PurchaseEvaluationWorkspacePage.tsx
new file mode 100644
index 0000000..c7eddb6
--- /dev/null
+++ b/fe-user/src/pages/pe/PurchaseEvaluationWorkspacePage.tsx
@@ -0,0 +1,140 @@
+// Workspace 2-panel cho leaf "Thao tác" Pe_*_Create (Type A=DuyetNcc / B=
+// DuyetNccPhuongAn). Pattern mirror HĐ Thầu phụ ContractCreatePage:
+//   Panel 1 (320px): list pure picker (read-only, không edit/delete) + sticky
+//                    "+ Thêm mới" bottom button (Q1 user 2026-05-07).
+//   Panel 2 (1fr):    empty state · mode=new <PeHeaderForm> · else
+//                    <PeDetailTabs mode="workspace"> (5 section + Section 5
+//                    Ý kiến 4PB DISABLED — Q5: nhập ở leaf "Duyệt").
+//
+// URL: /purchase-evaluations/workspace?type={1|2}[&id=...][&mode=new][&q=][&phase=]
+// Workflow Panel + Approvals + History KHÔNG render ở workspace (Q1 — chỉ
+// hiện ở leaf Danh sách + Duyệt vẫn 3-panel).
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
+import { useNavigate, useSearchParams } from 'react-router-dom'
+import { toast } from 'sonner'
+import { ClipboardCheck } from 'lucide-react'
+import { EmptyState } from '@/components/EmptyState'
+import { PeDetailTabs } from '@/components/pe/PeDetailTabs'
+import { PeListPanel } from '@/components/pe/PeListPanel'
+import { PeHeaderForm } from '@/components/pe/PeHeaderForm'
+import { api } from '@/lib/api'
+import { getErrorMessage } from '@/lib/apiError'
+import {
+  PurchaseEvaluationType,
+  PurchaseEvaluationTypeLabel,
+  type PeDetailBundle,
+} from '@/types/purchaseEvaluation'
+
+export function PurchaseEvaluationWorkspacePage() {
+  const navigate = useNavigate()
+  const qc = useQueryClient()
+  const [sp, setSp] = useSearchParams()
+  const typeFilter = sp.get('type') ? Number(sp.get('type')) : PurchaseEvaluationType.DuyetNcc
+  const search = sp.get('q') ?? ''
+  const phase = sp.get('phase') ?? ''
+  const selectedId = sp.get('id')
+  const mode = sp.get('mode') // 'new' | null
+
+  const detail = useQuery({
+    queryKey: ['pe-detail', selectedId],
+    queryFn: async () => (await api.get<PeDetailBundle>(`/purchase-evaluations/${selectedId}`)).data,
+    enabled: !!selectedId,
+  })
+
+  const del = useMutation({
+    mutationFn: async (id: string) => api.delete(`/purchase-evaluations/${id}`),
+    onSuccess: () => {
+      toast.success('Đã xóa phiếu.')
+      setParams({ id: null })
+      qc.invalidateQueries({ queryKey: ['pe-list'] })
+    },
+    onError: e => toast.error(getErrorMessage(e)),
+  })
+
+  function setParams(updates: Record<string, string | null>) {
+    const next = new URLSearchParams(sp)
+    for (const [k, v] of Object.entries(updates)) {
+      if (v == null || v === '') next.delete(k)
+      else next.set(k, v)
+    }
+    // Search input gõ liên tục → replace (không spam history); pick/mode → push
+    const replace = Object.keys(updates).length === 1 && updates.q !== undefined
+    setSp(next, { replace })
+  }
+
+  const headerTitle = `${PurchaseEvaluationTypeLabel[typeFilter]} — Thao tác`
+
+  return (
+    <div className="flex h-[calc(100vh-4rem)] flex-col">
+      <header className="flex shrink-0 flex-wrap items-center justify-between gap-3 border-b border-slate-200 bg-white px-6 py-3">
+        <div className="flex items-center gap-2">
+          <ClipboardCheck className="h-5 w-5 text-slate-500" />
+          <h1 className="text-base font-semibold tracking-tight text-slate-900">{headerTitle}</h1>
+        </div>
+        <div className="text-[12px] text-slate-500">
+          Workspace 2-panel — Workflow + Duyệt ở menu &ldquo;Duyệt&rdquo;.
+        </div>
+      </header>
+
+      <div className="grid flex-1 grid-cols-1 overflow-hidden lg:grid-cols-[320px_1fr]">
+        {/* Panel 1: List pure picker + sticky create */}
+        <PeListPanel
+          typeFilter={typeFilter}
+          selectedId={selectedId}
+          search={search}
+          phase={phase}
+          onSelect={id => setParams({ id, mode: null })}
+          onSearchChange={q => setParams({ q })}
+          onPhaseChange={p => setParams({ phase: p })}
+          showCreateButton
+          onCreate={() => setParams({ mode: 'new', id: null })}
+        />
+
+        {/* Panel 2: Empty | Header form | Detail tabs (workspace mode) */}
+        <main className="hidden overflow-y-auto bg-slate-50 p-6 lg:block">
+          {/* Empty: chưa pick + chưa create */}
+          {!selectedId && mode !== 'new' && (
+            <EmptyState
+              icon={ClipboardCheck}
+              title="Chọn phiếu hoặc tạo mới"
+              description='Chọn 1 phiếu ở danh sách trái để nhập liệu, hoặc bấm "+ Thêm mới" ở dưới.'
+            />
+          )}
+
+          {/* Mode "new": header form */}
+          {mode === 'new' && (
+            <PeHeaderForm
+              defaultType={typeFilter}
+              onSaved={(newId, t) => setParams({ id: newId, mode: null, type: String(t) })}
+              onCancel={() => setParams({ mode: null })}
+            />
+          )}
+
+          {/* Mode "edit": detail tabs (workspace = no workflow + Section 5 disabled) */}
+          {selectedId && detail.isLoading && (
+            <div className="text-sm text-slate-500">Đang tải…</div>
+          )}
+          {selectedId && detail.data && (
+            <PeDetailTabs
+              evaluation={detail.data}
+              onBack={() => setParams({ id: null })}
+              onDelete={() => del.mutate(detail.data!.id)}
+              mode="workspace"
+            />
+          )}
+        </main>
+      </div>
+
+      {/* Mobile fallback: nếu không lg, redirect về detail page */}
+      {selectedId && (
+        <div className="lg:hidden">
+          {/* Quick UX: tap row khi mobile sẽ navigate fullpage detail */}
+          <button
+            onClick={() => navigate(`/purchase-evaluations/${selectedId}`)}
+            className="hidden"
+          />
+        </div>
+      )}
+    </div>
+  )
+}