diff --git a/client/src/components/DashboardLayout.tsx b/client/src/components/DashboardLayout.tsx
index fbdb05f..97f0d65 100644
--- a/client/src/components/DashboardLayout.tsx
+++ b/client/src/components/DashboardLayout.tsx
@@ -15,29 +15,63 @@ import {
   SidebarMenu,
   SidebarMenuButton,
   SidebarMenuItem,
+  SidebarMenuSub,
+  SidebarMenuSubItem,
+  SidebarMenuSubButton,
   SidebarProvider,
   SidebarTrigger,
   useSidebar,
 } from "@/components/ui/sidebar";
+import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "@/components/ui/collapsible";
 import { getLoginUrl } from "@/const";
 import { useIsMobile } from "@/hooks/useMobile";
-import { LayoutDashboard, LogOut, PanelLeft, Users, FileText, Upload, History, Settings, Download, List, Zap } from "lucide-react";
+import { LayoutDashboard, LogOut, PanelLeft, Users, FileText, Upload, History, Settings, Download, List, Zap, ChevronDown, Receipt, Cog, ClipboardList } from "lucide-react";
 import { CSSProperties, useEffect, useRef, useState } from "react";
 import { useLocation } from "wouter";
 import { DashboardLayoutSkeleton } from './DashboardLayoutSkeleton';
 import { Button } from "./ui/button";
 
-const menuItems = [
-  { icon: LayoutDashboard, label: "Tableau de bord", path: "/dashboard" },
-  { icon: Upload, label: "Importer", path: "/upload" },
-  { icon: FileText, label: "Factures", path: "/invoices" },
-  { icon: FileText, label: "Factures BAP", path: "/invoices-bap" },
-  { icon: History, label: "Historique", path: "/history" },
-  { icon: Settings, label: "Param\u00e8tres", path: "/settings" },
-  { icon: Download, label: "Param\u00e8tres de r\u00e9ception", path: "/import-settings" },
-  { icon: Zap, label: "Automatismes", path: "/automation-rules" },
-  { icon: List, label: "Administration des listes", path: "/lists-admin" },
-  { icon: Users, label: "Utilisateurs", path: "/users", adminOnly: true },
+type MenuItem = {
+  icon: any;
+  label: string;
+  path?: string;
+  adminOnly?: boolean;
+  children?: MenuItem[];
+};
+
+const menuStructure: MenuItem[] = [
+  {
+    icon: LayoutDashboard,
+    label: "Tableau de bord",
+    path: "/dashboard",
+  },
+  {
+    icon: Receipt,
+    label: "Facturation",
+    children: [
+      { icon: Upload, label: "Import", path: "/upload" },
+      { icon: FileText, label: "Factures", path: "/invoices" },
+      { icon: FileText, label: "Factures BAP", path: "/invoices-bap" },
+    ],
+  },
+  {
+    icon: Cog,
+    label: "Configuration",
+    children: [
+      { icon: Settings, label: "Paramètres", path: "/settings" },
+      { icon: Download, label: "Paramètres d'import", path: "/import-settings" },
+      { icon: List, label: "Administration des listes", path: "/lists-admin" },
+      { icon: Zap, label: "Automatismes", path: "/automation-rules" },
+      { icon: Users, label: "Utilisateurs", path: "/users", adminOnly: true },
+    ],
+  },
+  {
+    icon: ClipboardList,
+    label: "Traçabilité",
+    children: [
+      { icon: History, label: "Historiques", path: "/history" },
+    ],
+  },
 ];
 
 const SIDEBAR_WIDTH_KEY = "sidebar-width";
@@ -120,8 +154,34 @@ function DashboardLayoutContent({
   const isCollapsed = state === "collapsed";
   const [isResizing, setIsResizing] = useState(false);
   const sidebarRef = useRef<HTMLDivElement>(null);
-  const activeMenuItem = menuItems.find(item => item.path === location);
   const isMobile = useIsMobile();
+  
+  // État pour les sections ouvertes (Tableau de bord ouvert par défaut)
+  const [openSections, setOpenSections] = useState<Set<string>>(new Set(["Tableau de bord"]));
+
+  // Trouver le label actif pour le header mobile
+  const findActiveLabel = (): string => {
+    for (const section of menuStructure) {
+      if (section.path === location) return section.label;
+      if (section.children) {
+        const child = section.children.find(c => c.path === location);
+        if (child) return child.label;
+      }
+    }
+    return "Menu";
+  };
+
+  const toggleSection = (label: string) => {
+    setOpenSections(prev => {
+      const newSet = new Set(prev);
+      if (newSet.has(label)) {
+        newSet.delete(label);
+      } else {
+        newSet.add(label);
+      }
+      return newSet;
+    });
+  };
 
   useEffect(() => {
     if (isCollapsed) {
@@ -159,6 +219,79 @@ function DashboardLayoutContent({
     };
   }, [isResizing, setSidebarWidth]);
 
+  const renderMenuItem = (item: MenuItem) => {
+    // Filtrer les items admin
+    if (item.adminOnly && user?.role !== "admin") return null;
+
+    // Item simple sans enfants
+    if (!item.children) {
+      const isActive = location === item.path;
+      return (
+        <SidebarMenuItem key={item.path}>
+          <SidebarMenuButton
+            isActive={isActive}
+            onClick={() => item.path && setLocation(item.path)}
+            tooltip={item.label}
+            className="h-10 transition-all font-normal"
+          >
+            <item.icon className={`h-4 w-4 ${isActive ? "text-primary" : ""}`} />
+            <span>{item.label}</span>
+          </SidebarMenuButton>
+        </SidebarMenuItem>
+      );
+    }
+
+    // Item avec enfants (accordéon)
+    const isOpen = openSections.has(item.label);
+    const hasActiveChild = item.children.some(child => child.path === location);
+
+    return (
+      <Collapsible
+        key={item.label}
+        open={isOpen}
+        onOpenChange={() => toggleSection(item.label)}
+        className="group/collapsible"
+      >
+        <SidebarMenuItem>
+          <CollapsibleTrigger asChild>
+            <SidebarMenuButton
+              tooltip={item.label}
+              className="h-10 transition-all font-normal"
+              isActive={hasActiveChild}
+            >
+              <item.icon className={`h-4 w-4 ${hasActiveChild ? "text-primary" : ""}`} />
+              <span>{item.label}</span>
+              <ChevronDown
+                className={`ml-auto h-4 w-4 transition-transform ${isOpen ? "rotate-180" : ""}`}
+              />
+            </SidebarMenuButton>
+          </CollapsibleTrigger>
+          <CollapsibleContent>
+            <SidebarMenuSub>
+              {item.children
+                .filter(child => !child.adminOnly || user?.role === "admin")
+                .map(child => {
+                  const isActive = location === child.path;
+                  return (
+                    <SidebarMenuSubItem key={child.path}>
+                      <SidebarMenuSubButton
+                        isActive={isActive}
+                        onClick={() => child.path && setLocation(child.path)}
+                        className="h-9"
+                      >
+                        <child.icon className={`h-3.5 w-3.5 ${isActive ? "text-primary" : ""}`} />
+                        <span>{child.label}</span>
+                      </SidebarMenuSubButton>
+                    </SidebarMenuSubItem>
+                  );
+                })}
+            </SidebarMenuSub>
+          </CollapsibleContent>
+        </SidebarMenuItem>
+      </Collapsible>
+    );
+  };
+
   return (
     <>
       <div className="relative" ref={sidebarRef}>
@@ -188,24 +321,7 @@ function DashboardLayoutContent({
 
           <SidebarContent className="gap-0">
             <SidebarMenu className="px-2 py-1">
-              {menuItems.filter(item => !item.adminOnly || user?.role === "admin").map(item => {
-                const isActive = location === item.path;
-                return (
-                  <SidebarMenuItem key={item.path}>
-                    <SidebarMenuButton
-                      isActive={isActive}
-                      onClick={() => setLocation(item.path)}
-                      tooltip={item.label}
-                      className={`h-10 transition-all font-normal`}
-                    >
-                      <item.icon
-                        className={`h-4 w-4 ${isActive ? "text-primary" : ""}`}
-                      />
-                      <span>{item.label}</span>
-                    </SidebarMenuButton>
-                  </SidebarMenuItem>
-                );
-              })}
+              {menuStructure.map(renderMenuItem)}
             </SidebarMenu>
           </SidebarContent>
 
@@ -258,7 +374,7 @@ function DashboardLayoutContent({
               <div className="flex items-center gap-3">
                 <div className="flex flex-col gap-1">
                   <span className="tracking-tight text-foreground">
-                    {activeMenuItem?.label ?? "Menu"}
+                    {findActiveLabel()}
                   </span>
                 </div>
               </div>
diff --git a/todo.md b/todo.md
index 9a33454..9cab362 100644
--- a/todo.md
+++ b/todo.md
@@ -405,4 +405,15 @@
 - [x] Appliquer les badges de statut et animations
 - [x] Améliorer la typographie et les espacements
 - [x] Tester localement les interfaces modernisées
+- [x] Déployer sur le VPS
+
+## Menu latéral accordéon
+- [x] Modifier DashboardLayout pour ajouter un menu accordéon
+- [x] Créer la structure avec 4 sections : Tableau de bord, Facturation, Configuration, Traçabilité
+- [x] Implémenter l'accordéon pour les sections Facturation, Configuration, Traçabilité
+- [x] Ajouter les icônes pour chaque section et sous-menu
+- [x] Configurer "Tableau de bord" comme section ouverte par défaut
+- [x] Créer les pages manquantes (Factures BAP, Automatismes, Utilisateurs, Historiques)
+- [x] Mettre à jour App.tsx avec les nouvelles routes
+- [ ] Tester la navigation et le comportement de l'accordéon
 - [ ] Déployer sur le VPS