diff --git a/apps/web/src/components/layout/sidebar.tsx b/apps/web/src/components/layout/sidebar.tsx
index c29a4475..01802dde 100644
--- a/apps/web/src/components/layout/sidebar.tsx
+++ b/apps/web/src/components/layout/sidebar.tsx
@@ -28,14 +28,12 @@ import { usePathname } from 'next/navigation'
 import Link from 'next/link'
 import { cn } from '@/lib/utils'
 import {
-  LayoutDashboard,
-  ShieldCheck,
-  Zap,
-  BookOpen,
-  Settings,
-  ChevronLeft,
-  ChevronRight,
-  Bug,
+  LayoutDashboard, ShieldCheck, Bell, Monitor, Activity,
+  Bug, GitBranch, Shield, ClipboardCheck,
+  Wrench, Package, Ticket, DollarSign, Zap, FileText,
+  BookOpen, Terminal, AppWindow, Server,
+  Users, BellRing, CreditCard, HelpCircle, Settings,
+  ChevronLeft, ChevronRight,
 } from 'lucide-react'
 // Phase 8.0 #15: 改用 approval store SSE (移除 polling)
 import { useApprovalStore } from '@/stores/approval.store'
@@ -59,17 +57,68 @@ type NavItemConfig = {
   badge?: boolean // 是否顯示動態徽章
 }
 
-// =============================================================================
-// Phase 7.0: 5 大核心樞紐
-// =============================================================================
+type NavSection = {
+  sectionKey: string
+  sectionLabel: string
+  items: NavItemConfig[]
+}
 
-const NAV_ITEMS: NavItemConfig[] = [
-  { id: 'warroom', href: '/', labelKey: 'dashboard', Icon: LayoutDashboard },
-  { id: 'authorizations', href: '/authorizations', labelKey: 'approvals', Icon: ShieldCheck, badge: true },
-  { id: 'errors', href: '/errors', labelKey: 'errors', Icon: Bug },
-  { id: 'action-logs', href: '/action-logs', labelKey: 'actions', Icon: Zap },
-  { id: 'knowledge-base', href: '/knowledge-base', labelKey: 'knowledge', Icon: BookOpen },
-  { id: 'settings', href: '/settings', labelKey: 'settings', Icon: Settings },
+// ============================================================
+// AI中心 v6 — 4分區 Sidebar（統帥批准 2026-04-01）
+// ============================================================
+
+const NAV_SECTIONS: NavSection[] = [
+  {
+    sectionKey: 'ai-core',
+    sectionLabel: 'AI 核心',
+    items: [
+      { id: 'ai-center',      href: '/',               labelKey: 'dashboard',     Icon: LayoutDashboard },
+      { id: 'authorizations', href: '/authorizations',  labelKey: 'approvals',     Icon: ShieldCheck, badge: true },
+      { id: 'alerts',         href: '/alerts',          labelKey: 'alerts',        Icon: Bell },
+    ],
+  },
+  {
+    sectionKey: 'monitoring',
+    sectionLabel: '監控與安全',
+    items: [
+      { id: 'monitoring',  href: '/monitoring',  labelKey: 'monitoring',  Icon: Monitor },
+      { id: 'apm',         href: '/apm',         labelKey: 'apm',         Icon: Activity },
+      { id: 'errors',      href: '/errors',      labelKey: 'errors',      Icon: Bug },
+      { id: 'topology',    href: '/topology',    labelKey: 'topology',    Icon: GitBranch },
+      { id: 'security',    href: '/security',    labelKey: 'security',    Icon: Shield },
+      { id: 'compliance',  href: '/compliance',  labelKey: 'compliance',  Icon: ClipboardCheck },
+    ],
+  },
+  {
+    sectionKey: 'ops',
+    sectionLabel: '運維管理',
+    items: [
+      { id: 'auto-repair',  href: '/auto-repair',  labelKey: 'autoRepair',  Icon: Wrench },
+      { id: 'deployments',  href: '/deployments',  labelKey: 'deployments', Icon: Package },
+      { id: 'tickets',      href: '/tickets',      labelKey: 'tickets',     Icon: Ticket },
+      { id: 'cost',         href: '/cost',         labelKey: 'cost',        Icon: DollarSign },
+      { id: 'action-logs',  href: '/action-logs',  labelKey: 'actions',     Icon: Zap },
+      { id: 'reports',      href: '/reports',      labelKey: 'reports',     Icon: FileText },
+    ],
+  },
+  {
+    sectionKey: 'knowledge',
+    sectionLabel: '知識與工具',
+    items: [
+      { id: 'knowledge-base', href: '/knowledge-base', labelKey: 'knowledge', Icon: BookOpen },
+      { id: 'terminal',       href: '/terminal',       labelKey: 'terminal',  Icon: Terminal },
+      { id: 'apps',           href: '/apps',           labelKey: 'apps',      Icon: AppWindow },
+      { id: 'services',       href: '/services',       labelKey: 'services',  Icon: Server },
+    ],
+  },
+]
+
+const BOTTOM_NAV_ITEMS: NavItemConfig[] = [
+  { id: 'users',         href: '/users',         labelKey: 'users',         Icon: Users },
+  { id: 'notifications', href: '/notifications', labelKey: 'notifications', Icon: BellRing },
+  { id: 'billing',       href: '/billing',       labelKey: 'billing',       Icon: CreditCard },
+  { id: 'help',          href: '/help',          labelKey: 'help',          Icon: HelpCircle },
+  { id: 'settings',      href: '/settings',      labelKey: 'settings',      Icon: Settings },
 ]
 
 // =============================================================================
@@ -136,54 +185,98 @@ export function Sidebar({
         )}
       </div>
 
-      {/* 導航列表 - 5 大核心樞紐 */}
-      <nav className="flex-1 py-4 overflow-y-auto">
-        <ul className="space-y-0.5 px-2">
-          {NAV_ITEMS.map((item) => {
-            const active = isActive(item.href)
-            return (
-              <li key={item.id}>
+      {/* 導航列表 - AI中心 v6 4分區 */}
+      <nav className="flex-1 py-2 overflow-y-auto">
+        {/* 4 分區菜單 */}
+        {NAV_SECTIONS.map(section => (
+          <div key={section.sectionKey} style={{ marginBottom: 4 }}>
+            {/* 分區標題（collapsed 時隱藏）*/}
+            {!collapsed && (
+              <div style={{
+                fontSize: 8,
+                color: '#b0ad9f',
+                letterSpacing: '1.5px',
+                textTransform: 'uppercase' as const,
+                padding: '8px 12px 3px',
+                fontFamily: 'monospace',
+              }}>
+                {section.sectionLabel}
+              </div>
+            )}
+            {section.items.map(item => {
+              const active = isActive(item.href)
+              const count = item.badge && mounted ? pendingCount : 0
+              return (
                 <Link
+                  key={item.id}
                   href={`/${locale}${item.href === '/' ? '' : item.href}`}
-                  className={cn(
-                    'flex items-center gap-3 px-3 py-2.5 rounded-sm',
-                    'transition-all duration-150',
-                    'relative',
-                    // Phase 7.0 視覺規範
-                    active
-                      ? 'font-bold text-black bg-neutral-100'
-                      : 'text-neutral-500 hover:bg-neutral-50 hover:text-black',
-                    collapsed && 'justify-center px-2'
-                  )}
+                  style={{
+                    display: 'flex',
+                    alignItems: 'center',
+                    gap: collapsed ? 0 : 8,
+                    justifyContent: collapsed ? 'center' : 'flex-start',
+                    padding: collapsed ? '8px 0' : '6px 12px',
+                    fontSize: 11,
+                    color: active ? '#141413' : '#87867f',
+                    fontWeight: active ? 600 : 400,
+                    borderRight: active ? '2px solid #d97757' : '2px solid transparent',
+                    background: active ? 'rgba(217,119,87,0.08)' : 'transparent',
+                    textDecoration: 'none',
+                    transition: 'all 0.15s',
+                    position: 'relative' as const,
+                  }}
                 >
-                  <item.Icon className={cn(
-                    'w-[18px] h-[18px] flex-shrink-0',
-                    active ? 'text-black' : 'text-neutral-400'
-                  )} />
-
-                  {!collapsed && (
-                    <span className="text-[13px] tracking-wide truncate">
-                      {t(item.labelKey)}
-                    </span>
-                  )}
-
-                  {/* 動態徽章 - 授權中心 (Phase 8.0 #15: mounted check 防止 hydration mismatch) */}
-                  {item.badge && mounted && pendingCount > 0 && (
-                    <span className={cn(
-                      'flex items-center justify-center',
-                      'min-w-[18px] h-[18px] px-1',
-                      'text-[10px] font-mono font-bold',
-                      'bg-neutral-900 text-white rounded-sm',
-                      collapsed ? 'absolute top-1 right-1' : 'ml-auto'
-                    )}>
-                      {pendingCount > 99 ? '99+' : pendingCount}
+                  <item.Icon size={14} />
+                  {!collapsed && <span>{t(item.labelKey)}</span>}
+                  {item.badge && count > 0 && (
+                    <span style={{
+                      marginLeft: 'auto',
+                      fontSize: 8,
+                      background: '#d97757',
+                      color: 'white',
+                      borderRadius: 10,
+                      padding: '1px 5px',
+                      fontWeight: 700,
+                    }}>
+                      {count > 99 ? '99+' : count}
                     </span>
                   )}
                 </Link>
-              </li>
-            )
-          })}
-        </ul>
+              )
+            })}
+          </div>
+        ))}
+
+        {/* Separator */}
+        <div style={{ borderTop: '0.5px solid #e0ddd4', margin: '6px 0' }} />
+
+        {/* 底部菜單 */}
+        {BOTTOM_NAV_ITEMS.map(item => {
+          const active = isActive(item.href)
+          return (
+            <Link
+              key={item.id}
+              href={`/${locale}${item.href === '/' ? '' : item.href}`}
+              style={{
+                display: 'flex',
+                alignItems: 'center',
+                gap: collapsed ? 0 : 8,
+                justifyContent: collapsed ? 'center' : 'flex-start',
+                padding: collapsed ? '7px 0' : '5px 12px',
+                fontSize: 10,
+                color: active ? '#141413' : '#87867f',
+                fontWeight: active ? 600 : 400,
+                borderRight: active ? '2px solid #d97757' : '2px solid transparent',
+                background: active ? 'rgba(217,119,87,0.08)' : 'transparent',
+                textDecoration: 'none',
+                transition: 'all 0.15s',
+              }}
+            >
+              <item.Icon size={12} />
+              {!collapsed && <span>{t(item.labelKey)}</span>}
+            </Link>
+          )
+        })}
       </nav>
 
       {/* 底部區域 - 極簡版本號 */}