diff --git a/fe-admin/src/pages/pe/PurchaseEvaluationsListPage.tsx b/fe-admin/src/pages/pe/PurchaseEvaluationsListPage.tsx
index 7b941d3..c086933 100644
--- a/fe-admin/src/pages/pe/PurchaseEvaluationsListPage.tsx
+++ b/fe-admin/src/pages/pe/PurchaseEvaluationsListPage.tsx
@@ -1,5 +1,9 @@
 // List + Detail phiếu Duyệt NCC — 3-panel: List | Detail tabs | Workflow + history.
 // URL params: type (filter A/B), pendingMe (1=inbox), id (selected), q (search).
+// Plan AG Phase 1 (S26 2026-05-21) — Tree view 2-level Project > Gói thầu > PE
+// UAT feedback bro Tra Sol: flat list "đám rừng" → Outlook folder structure.
+// FE-only group view (no schema change) — Phase 2 ProjectPackage defer sau UAT confirm.
+import { useMemo, useState } from 'react'
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useNavigate, useSearchParams } from 'react-router-dom'
 import { toast } from 'sonner'
@@ -110,9 +114,79 @@ export function PurchaseEvaluationsListPage() {
   // Duyệt (pendingMe) → filter cứng client-side chỉ "Đã gửi duyệt" (Nháp/Trả lại/
   // Đã duyệt/Từ chối loại bỏ). BE /inbox hiện loose UAT có thể trả phiếu Nháp →
   // FE filter để UX đúng kỳ vọng. Phân quyền strict V2 BE pending Session 18+.
-  const rows = pendingMe
-    ? allRows.filter(p => getPeDisplayStatus(p.phase) === PeDisplayStatus.DaGuiDuyet)
-    : allRows
+
+  // Plan AG Chunk A — Data transform useMemo group nested 2-level Project > Gói thầu
+  // Filter (pendingMe → DaGuiDuyet) áp dụng TRƯỚC group để empty state đúng.
+  // Normalize TenGoiThau: trim + toLowerCase làm group key, display raw đầu tiên.
+  // Fallback: "(Dự án đã xoá)" empty projectName + "(Chưa phân loại)" empty TenGoiThau.
+  // Sort vi locale A-Z cả 2 cấp.
+  type GoiThauGroup = {
+    displayName: string
+    normalizedKey: string
+    items: PeListItem[]
+  }
+  type ProjectGroup = {
+    projectId: string | null
+    projectName: string
+    goiThauList: GoiThauGroup[]
+    totalCount: number
+  }
+  const projectGroups = useMemo<ProjectGroup[]>(() => {
+    const filtered = pendingMe
+      ? allRows.filter(p => getPeDisplayStatus(p.phase) === PeDisplayStatus.DaGuiDuyet)
+      : allRows
+    const projectMap = new Map<string, ProjectGroup>()
+    for (const p of filtered) {
+      const projKey = p.projectId ?? '__no_project__'
+      const projName = p.projectName?.trim() || '(Dự án đã xoá)'
+      if (!projectMap.has(projKey)) {
+        projectMap.set(projKey, { projectId: p.projectId ?? null, projectName: projName, goiThauList: [], totalCount: 0 })
+      }
+      const pg = projectMap.get(projKey)!
+      const rawGT = (p.tenGoiThau ?? '').trim()
+      const normKey = rawGT.toLowerCase() || '__no_goithau__'
+      const displayGT = rawGT || '(Chưa phân loại)'
+      let gt = pg.goiThauList.find(g => g.normalizedKey === normKey)
+      if (!gt) {
+        gt = { displayName: displayGT, normalizedKey: normKey, items: [] }
+        pg.goiThauList.push(gt)
+      }
+      gt.items.push(p)
+      pg.totalCount++
+    }
+    const arr = Array.from(projectMap.values())
+    arr.sort((a, b) => a.projectName.localeCompare(b.projectName, 'vi'))
+    for (const pg of arr) {
+      pg.goiThauList.sort((a, b) => a.displayName.localeCompare(b.displayName, 'vi'))
+    }
+    return arr
+  }, [allRows, pendingMe])
+
+  // Total row count cho header badge (pendingMe đếm filtered, Danh sách đếm BE total).
+  const totalRowCount = projectGroups.reduce((sum, pg) => sum + pg.totalCount, 0)
+
+  // Plan AG Chunk C — Expand state localStorage persist Set<string>
+  // Default empty Set (all collapse) — bro Tra Sol expect Outlook-style closed default.
+  // Project key: projectId or '__no_project__'; Gói thầu key: `${projectId}::${normalizedGoiThau}`.
+  const STORAGE_KEY = 'pe_list_expanded_groups'
+  const [expandedSet, setExpandedSet] = useState<Set<string>>(() => {
+    try {
+      const raw = localStorage.getItem(STORAGE_KEY)
+      return raw ? new Set(JSON.parse(raw) as string[]) : new Set<string>()
+    } catch {
+      return new Set<string>()
+    }
+  })
+  const isExpanded = (key: string) => expandedSet.has(key)
+  const toggleExpand = (key: string, open: boolean) => {
+    setExpandedSet(prev => {
+      const next = new Set(prev)
+      if (open) next.add(key)
+      else next.delete(key)
+      try { localStorage.setItem(STORAGE_KEY, JSON.stringify([...next])) } catch {}
+      return next
+    })
+  }
 
   const headerTitle = typeFilter
     ? (pendingMe ? `${PurchaseEvaluationTypeLabel[typeFilter]} — Chờ duyệt` : PurchaseEvaluationTypeLabel[typeFilter])
@@ -125,7 +199,7 @@ export function PurchaseEvaluationsListPage() {
           <ClipboardCheck className="h-5 w-5 text-slate-500" />
           <h1 className="text-base font-semibold tracking-tight text-slate-900">{headerTitle}</h1>
           <span className="ml-2 rounded-full bg-slate-100 px-2 py-0.5 text-[11px] font-medium text-slate-600">
-            {pendingMe ? rows.length : (list.data?.total ?? 0)}
+            {pendingMe ? totalRowCount : (list.data?.total ?? 0)}
           </span>
         </div>
       </header>
@@ -191,65 +265,106 @@ export function PurchaseEvaluationsListPage() {
                 ))}
               </div>
             )}
-            {!list.isLoading && rows.length === 0 && (
+            {!list.isLoading && projectGroups.length === 0 && (
               <div className="p-6">
                 <EmptyState icon={ClipboardCheck} title="Chưa có phiếu" description="Tạo phiếu mới để bắt đầu quy trình." />
               </div>
             )}
-            <ul className="divide-y divide-slate-100">
-              {rows.map(p => (
-                <li key={p.id}>
-                  <button
-                    onClick={() => selectRow(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',
-                          PeDisplayStatusColor[getPeDisplayStatus(p.phase)],
-                        )}
-                      >
-                        {PeDisplayStatusLabel[getPeDisplayStatus(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>
-                      {/* S23 t2 UAT: bro yêu cầu đổi SLA countdown → ngày giờ tạo phiếu.
-                          BE list sort theo UpdatedAt DESC (fallback CreatedAt) — phiếu vừa
-                          update (Tạo / Gửi duyệt / Trả lại) đưa lên đầu list. */}
-                      <span className="font-medium text-slate-600" title={`Tạo lúc ${new Date(p.createdAt).toLocaleString('vi-VN')}`}>
-                        {new Date(p.createdAt).toLocaleString('vi-VN', {
-                          day: '2-digit', month: '2-digit', year: 'numeric',
-                          hour: '2-digit', minute: '2-digit',
-                        })}
-                      </span>
-                    </div>
-                    {p.contractId && (
-                      <div className="mt-1 text-[10px] text-brand-600">✓ Đã tạo HĐ</div>
-                    )}
-                  </button>
-                </li>
+            {/* Plan AG Chunk B — Tree view 2-level Project > Gói thầu > PE (Outlook-style).
+                <details>/<summary> HTML native (no shadcn Accordion — gap component lib fe-user).
+                Tailwind v3 named groups group/proj + group/gt cho chevron rotation animation.
+                [&::-webkit-details-marker]:hidden ẩn default disclosure triangle browser. */}
+            <div className="divide-y divide-slate-100">
+              {projectGroups.map(pg => (
+                <details
+                  key={pg.projectId ?? '__no_project__'}
+                  open={isExpanded(pg.projectId ?? '__no_project__')}
+                  onToggle={e => toggleExpand(pg.projectId ?? '__no_project__', (e.currentTarget as HTMLDetailsElement).open)}
+                  className="group/proj"
+                >
+                  <summary className="flex cursor-pointer items-center gap-1.5 bg-slate-50 px-3 py-2 hover:bg-slate-100 [&::-webkit-details-marker]:hidden">
+                    <svg className="h-3 w-3 shrink-0 text-slate-500 transition-transform group-open/proj:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
+                    <span className="text-base">📁</span>
+                    <span className="flex-1 truncate text-[13px] font-medium text-slate-900">{pg.projectName}</span>
+                    <span className="rounded-full bg-slate-200 px-2 py-0.5 text-[10px] font-medium text-slate-700">{pg.totalCount}</span>
+                  </summary>
+                  <div className="ml-3 border-l border-slate-200">
+                    {pg.goiThauList.map(gt => {
+                      const gtKey = `${pg.projectId ?? '__no_project__'}::${gt.normalizedKey}`
+                      return (
+                        <details
+                          key={gtKey}
+                          open={isExpanded(gtKey)}
+                          onToggle={e => toggleExpand(gtKey, (e.currentTarget as HTMLDetailsElement).open)}
+                          className="group/gt"
+                        >
+                          <summary className="flex cursor-pointer items-center gap-1.5 px-3 py-1.5 hover:bg-slate-50 [&::-webkit-details-marker]:hidden">
+                            <svg className="h-3 w-3 shrink-0 text-slate-400 transition-transform group-open/gt:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
+                            <span className="text-sm">📄</span>
+                            <span className="flex-1 truncate text-[12px] text-slate-700">{gt.displayName}</span>
+                            <span className="rounded bg-slate-100 px-1.5 py-0.5 text-[10px] text-slate-600">{gt.items.length}</span>
+                          </summary>
+                          <ul className="divide-y divide-slate-100">
+                            {gt.items.map(p => (
+                              <li key={p.id}>
+                                <button
+                                  onClick={() => selectRow(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',
+                                        PeDisplayStatusColor[getPeDisplayStatus(p.phase)],
+                                      )}
+                                    >
+                                      {PeDisplayStatusLabel[getPeDisplayStatus(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>
+                                    {/* S23 t2 UAT: bro yêu cầu đổi SLA countdown → ngày giờ tạo phiếu.
+                                        BE list sort theo UpdatedAt DESC (fallback CreatedAt) — phiếu vừa
+                                        update (Tạo / Gửi duyệt / Trả lại) đưa lên đầu list. */}
+                                    <span className="font-medium text-slate-600" title={`Tạo lúc ${new Date(p.createdAt).toLocaleString('vi-VN')}`}>
+                                      {new Date(p.createdAt).toLocaleString('vi-VN', {
+                                        day: '2-digit', month: '2-digit', year: 'numeric',
+                                        hour: '2-digit', minute: '2-digit',
+                                      })}
+                                    </span>
+                                  </div>
+                                  {p.contractId && (
+                                    <div className="mt-1 text-[10px] text-brand-600">✓ Đã tạo HĐ</div>
+                                  )}
+                                </button>
+                              </li>
+                            ))}
+                          </ul>
+                        </details>
+                      )
+                    })}
+                  </div>
+                </details>
               ))}
-            </ul>
+            </div>
           </div>
         </aside>
 
diff --git a/fe-user/src/pages/pe/PurchaseEvaluationsListPage.tsx b/fe-user/src/pages/pe/PurchaseEvaluationsListPage.tsx
index 7b941d3..c086933 100644
--- a/fe-user/src/pages/pe/PurchaseEvaluationsListPage.tsx
+++ b/fe-user/src/pages/pe/PurchaseEvaluationsListPage.tsx
@@ -1,5 +1,9 @@
 // List + Detail phiếu Duyệt NCC — 3-panel: List | Detail tabs | Workflow + history.
 // URL params: type (filter A/B), pendingMe (1=inbox), id (selected), q (search).
+// Plan AG Phase 1 (S26 2026-05-21) — Tree view 2-level Project > Gói thầu > PE
+// UAT feedback bro Tra Sol: flat list "đám rừng" → Outlook folder structure.
+// FE-only group view (no schema change) — Phase 2 ProjectPackage defer sau UAT confirm.
+import { useMemo, useState } from 'react'
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useNavigate, useSearchParams } from 'react-router-dom'
 import { toast } from 'sonner'
@@ -110,9 +114,79 @@ export function PurchaseEvaluationsListPage() {
   // Duyệt (pendingMe) → filter cứng client-side chỉ "Đã gửi duyệt" (Nháp/Trả lại/
   // Đã duyệt/Từ chối loại bỏ). BE /inbox hiện loose UAT có thể trả phiếu Nháp →
   // FE filter để UX đúng kỳ vọng. Phân quyền strict V2 BE pending Session 18+.
-  const rows = pendingMe
-    ? allRows.filter(p => getPeDisplayStatus(p.phase) === PeDisplayStatus.DaGuiDuyet)
-    : allRows
+
+  // Plan AG Chunk A — Data transform useMemo group nested 2-level Project > Gói thầu
+  // Filter (pendingMe → DaGuiDuyet) áp dụng TRƯỚC group để empty state đúng.
+  // Normalize TenGoiThau: trim + toLowerCase làm group key, display raw đầu tiên.
+  // Fallback: "(Dự án đã xoá)" empty projectName + "(Chưa phân loại)" empty TenGoiThau.
+  // Sort vi locale A-Z cả 2 cấp.
+  type GoiThauGroup = {
+    displayName: string
+    normalizedKey: string
+    items: PeListItem[]
+  }
+  type ProjectGroup = {
+    projectId: string | null
+    projectName: string
+    goiThauList: GoiThauGroup[]
+    totalCount: number
+  }
+  const projectGroups = useMemo<ProjectGroup[]>(() => {
+    const filtered = pendingMe
+      ? allRows.filter(p => getPeDisplayStatus(p.phase) === PeDisplayStatus.DaGuiDuyet)
+      : allRows
+    const projectMap = new Map<string, ProjectGroup>()
+    for (const p of filtered) {
+      const projKey = p.projectId ?? '__no_project__'
+      const projName = p.projectName?.trim() || '(Dự án đã xoá)'
+      if (!projectMap.has(projKey)) {
+        projectMap.set(projKey, { projectId: p.projectId ?? null, projectName: projName, goiThauList: [], totalCount: 0 })
+      }
+      const pg = projectMap.get(projKey)!
+      const rawGT = (p.tenGoiThau ?? '').trim()
+      const normKey = rawGT.toLowerCase() || '__no_goithau__'
+      const displayGT = rawGT || '(Chưa phân loại)'
+      let gt = pg.goiThauList.find(g => g.normalizedKey === normKey)
+      if (!gt) {
+        gt = { displayName: displayGT, normalizedKey: normKey, items: [] }
+        pg.goiThauList.push(gt)
+      }
+      gt.items.push(p)
+      pg.totalCount++
+    }
+    const arr = Array.from(projectMap.values())
+    arr.sort((a, b) => a.projectName.localeCompare(b.projectName, 'vi'))
+    for (const pg of arr) {
+      pg.goiThauList.sort((a, b) => a.displayName.localeCompare(b.displayName, 'vi'))
+    }
+    return arr
+  }, [allRows, pendingMe])
+
+  // Total row count cho header badge (pendingMe đếm filtered, Danh sách đếm BE total).
+  const totalRowCount = projectGroups.reduce((sum, pg) => sum + pg.totalCount, 0)
+
+  // Plan AG Chunk C — Expand state localStorage persist Set<string>
+  // Default empty Set (all collapse) — bro Tra Sol expect Outlook-style closed default.
+  // Project key: projectId or '__no_project__'; Gói thầu key: `${projectId}::${normalizedGoiThau}`.
+  const STORAGE_KEY = 'pe_list_expanded_groups'
+  const [expandedSet, setExpandedSet] = useState<Set<string>>(() => {
+    try {
+      const raw = localStorage.getItem(STORAGE_KEY)
+      return raw ? new Set(JSON.parse(raw) as string[]) : new Set<string>()
+    } catch {
+      return new Set<string>()
+    }
+  })
+  const isExpanded = (key: string) => expandedSet.has(key)
+  const toggleExpand = (key: string, open: boolean) => {
+    setExpandedSet(prev => {
+      const next = new Set(prev)
+      if (open) next.add(key)
+      else next.delete(key)
+      try { localStorage.setItem(STORAGE_KEY, JSON.stringify([...next])) } catch {}
+      return next
+    })
+  }
 
   const headerTitle = typeFilter
     ? (pendingMe ? `${PurchaseEvaluationTypeLabel[typeFilter]} — Chờ duyệt` : PurchaseEvaluationTypeLabel[typeFilter])
@@ -125,7 +199,7 @@ export function PurchaseEvaluationsListPage() {
           <ClipboardCheck className="h-5 w-5 text-slate-500" />
           <h1 className="text-base font-semibold tracking-tight text-slate-900">{headerTitle}</h1>
           <span className="ml-2 rounded-full bg-slate-100 px-2 py-0.5 text-[11px] font-medium text-slate-600">
-            {pendingMe ? rows.length : (list.data?.total ?? 0)}
+            {pendingMe ? totalRowCount : (list.data?.total ?? 0)}
           </span>
         </div>
       </header>
@@ -191,65 +265,106 @@ export function PurchaseEvaluationsListPage() {
                 ))}
               </div>
             )}
-            {!list.isLoading && rows.length === 0 && (
+            {!list.isLoading && projectGroups.length === 0 && (
               <div className="p-6">
                 <EmptyState icon={ClipboardCheck} title="Chưa có phiếu" description="Tạo phiếu mới để bắt đầu quy trình." />
               </div>
             )}
-            <ul className="divide-y divide-slate-100">
-              {rows.map(p => (
-                <li key={p.id}>
-                  <button
-                    onClick={() => selectRow(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',
-                          PeDisplayStatusColor[getPeDisplayStatus(p.phase)],
-                        )}
-                      >
-                        {PeDisplayStatusLabel[getPeDisplayStatus(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>
-                      {/* S23 t2 UAT: bro yêu cầu đổi SLA countdown → ngày giờ tạo phiếu.
-                          BE list sort theo UpdatedAt DESC (fallback CreatedAt) — phiếu vừa
-                          update (Tạo / Gửi duyệt / Trả lại) đưa lên đầu list. */}
-                      <span className="font-medium text-slate-600" title={`Tạo lúc ${new Date(p.createdAt).toLocaleString('vi-VN')}`}>
-                        {new Date(p.createdAt).toLocaleString('vi-VN', {
-                          day: '2-digit', month: '2-digit', year: 'numeric',
-                          hour: '2-digit', minute: '2-digit',
-                        })}
-                      </span>
-                    </div>
-                    {p.contractId && (
-                      <div className="mt-1 text-[10px] text-brand-600">✓ Đã tạo HĐ</div>
-                    )}
-                  </button>
-                </li>
+            {/* Plan AG Chunk B — Tree view 2-level Project > Gói thầu > PE (Outlook-style).
+                <details>/<summary> HTML native (no shadcn Accordion — gap component lib fe-user).
+                Tailwind v3 named groups group/proj + group/gt cho chevron rotation animation.
+                [&::-webkit-details-marker]:hidden ẩn default disclosure triangle browser. */}
+            <div className="divide-y divide-slate-100">
+              {projectGroups.map(pg => (
+                <details
+                  key={pg.projectId ?? '__no_project__'}
+                  open={isExpanded(pg.projectId ?? '__no_project__')}
+                  onToggle={e => toggleExpand(pg.projectId ?? '__no_project__', (e.currentTarget as HTMLDetailsElement).open)}
+                  className="group/proj"
+                >
+                  <summary className="flex cursor-pointer items-center gap-1.5 bg-slate-50 px-3 py-2 hover:bg-slate-100 [&::-webkit-details-marker]:hidden">
+                    <svg className="h-3 w-3 shrink-0 text-slate-500 transition-transform group-open/proj:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
+                    <span className="text-base">📁</span>
+                    <span className="flex-1 truncate text-[13px] font-medium text-slate-900">{pg.projectName}</span>
+                    <span className="rounded-full bg-slate-200 px-2 py-0.5 text-[10px] font-medium text-slate-700">{pg.totalCount}</span>
+                  </summary>
+                  <div className="ml-3 border-l border-slate-200">
+                    {pg.goiThauList.map(gt => {
+                      const gtKey = `${pg.projectId ?? '__no_project__'}::${gt.normalizedKey}`
+                      return (
+                        <details
+                          key={gtKey}
+                          open={isExpanded(gtKey)}
+                          onToggle={e => toggleExpand(gtKey, (e.currentTarget as HTMLDetailsElement).open)}
+                          className="group/gt"
+                        >
+                          <summary className="flex cursor-pointer items-center gap-1.5 px-3 py-1.5 hover:bg-slate-50 [&::-webkit-details-marker]:hidden">
+                            <svg className="h-3 w-3 shrink-0 text-slate-400 transition-transform group-open/gt:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
+                            <span className="text-sm">📄</span>
+                            <span className="flex-1 truncate text-[12px] text-slate-700">{gt.displayName}</span>
+                            <span className="rounded bg-slate-100 px-1.5 py-0.5 text-[10px] text-slate-600">{gt.items.length}</span>
+                          </summary>
+                          <ul className="divide-y divide-slate-100">
+                            {gt.items.map(p => (
+                              <li key={p.id}>
+                                <button
+                                  onClick={() => selectRow(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',
+                                        PeDisplayStatusColor[getPeDisplayStatus(p.phase)],
+                                      )}
+                                    >
+                                      {PeDisplayStatusLabel[getPeDisplayStatus(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>
+                                    {/* S23 t2 UAT: bro yêu cầu đổi SLA countdown → ngày giờ tạo phiếu.
+                                        BE list sort theo UpdatedAt DESC (fallback CreatedAt) — phiếu vừa
+                                        update (Tạo / Gửi duyệt / Trả lại) đưa lên đầu list. */}
+                                    <span className="font-medium text-slate-600" title={`Tạo lúc ${new Date(p.createdAt).toLocaleString('vi-VN')}`}>
+                                      {new Date(p.createdAt).toLocaleString('vi-VN', {
+                                        day: '2-digit', month: '2-digit', year: 'numeric',
+                                        hour: '2-digit', minute: '2-digit',
+                                      })}
+                                    </span>
+                                  </div>
+                                  {p.contractId && (
+                                    <div className="mt-1 text-[10px] text-brand-600">✓ Đã tạo HĐ</div>
+                                  )}
+                                </button>
+                              </li>
+                            ))}
+                          </ul>
+                        </details>
+                      )
+                    })}
+                  </div>
+                </details>
               ))}
-            </ul>
+            </div>
           </div>
         </aside>