diff --git a/client/src/components/AppSidebar.tsx b/client/src/components/AppSidebar.tsx
index 83b69a2..a68e1b7 100644
--- a/client/src/components/AppSidebar.tsx
+++ b/client/src/components/AppSidebar.tsx
@@ -1,12 +1,10 @@
 // AppSidebar.tsx — Sidebar partagée avec navigation hiérarchique en accordéon
 // Structure mise à jour :
 //   ├── ITINOVA (bleu)
-//   │   ├── Établissements (bleu foncé)
-//   │   │   ├── Renouvellement PC  → /
-//   │   │   ├── CAPEX - Construction → /budget2027
-//   │   │   └── CAPEX - Synthèse → /dsi-capex
-//   │   └── DSI (bleu foncé)
-//   │       └── OPEX (Charges) → /dsi-opex
+//   │   ├── Renouvellement PC  → /
+//   │   ├── CAPEX - Construction → /budget2027
+//   │   ├── CAPEX - Synthèse → /dsi-capex
+//   │   └── OPEX (Charges) → /dsi-opex
 //   ├── SANTINOVA (vert)
 //   ├── SOINS ET SANTÉ (violet)
 //   ├── ST EXUPÉRY (orange)
@@ -105,19 +103,12 @@ interface NavLeaf {
   path: string;
 }
 
-interface NavSubMenu {
-  id: string;
-  label: string;
-  icon: React.ElementType;
-  children: NavLeaf[];
-}
-
 interface NavSection {
   id: string;
   label: string;
   icon: React.ElementType;
-  path?: string;           // si section sans sous-menu (feuille directe)
-  children?: NavSubMenu[]; // sous-menus
+  path?: string;       // si section feuille directe
+  children?: NavLeaf[]; // items directs (sans sous-menu intermédiaire)
 }
 
 const NAV_SECTIONS: NavSection[] = [
@@ -126,24 +117,10 @@ const NAV_SECTIONS: NavSection[] = [
     label: 'ITINOVA',
     icon: Building2,
     children: [
-      {
-        id: 'etablissements',
-        label: 'Établissements',
-        icon: Layers,
-        children: [
-          { id: 'renouvellement-pc',  label: 'Renouvellement PC',    icon: Monitor,          path: '/' },
-          { id: 'budget2027',         label: 'CAPEX - Construction', icon: FileText,         path: '/budget2027' },
-          { id: 'dsi-capex',          label: 'CAPEX - Synthèse',     icon: TableProperties,  path: '/dsi-capex' },
-        ],
-      },
-      {
-        id: 'dsi',
-        label: 'DSI',
-        icon: BarChart3,
-        children: [
-          { id: 'dsi-opex', label: 'OPEX (Charges)', icon: TrendingDown, path: '/dsi-opex' },
-        ],
-      },
+      { id: 'renouvellement-pc',  label: 'Renouvellement PC',    icon: Monitor,         path: '/' },
+      { id: 'budget2027',         label: 'CAPEX - Construction', icon: FileText,        path: '/budget2027' },
+      { id: 'dsi-capex',          label: 'CAPEX - Synthèse',     icon: TableProperties, path: '/dsi-capex' },
+      { id: 'dsi-opex',           label: 'OPEX (Charges)',       icon: TrendingDown,    path: '/dsi-opex' },
     ],
   },
   {
@@ -175,24 +152,13 @@ function isLeafActive(path: string, currentPath: string): boolean {
 
 function sectionHasActive(section: NavSection, currentPath: string): boolean {
   if (section.path) return isLeafActive(section.path, currentPath);
-  return section.children?.some(sub =>
-    sub.children.some(leaf => isLeafActive(leaf.path, currentPath))
-  ) ?? false;
-}
-
-function subMenuHasActive(sub: NavSubMenu, currentPath: string): boolean {
-  return sub.children.some(leaf => isLeafActive(leaf.path, currentPath));
+  return section.children?.some(leaf => isLeafActive(leaf.path!, currentPath)) ?? false;
 }
 
 function getInitialOpenSections(currentPath: string): Set<string> {
   const open = new Set<string>();
   for (const section of NAV_SECTIONS) {
-    if (sectionHasActive(section, currentPath)) {
-      open.add(section.id);
-      section.children?.forEach(sub => {
-        if (subMenuHasActive(sub, currentPath)) open.add(sub.id);
-      });
-    }
+    if (sectionHasActive(section, currentPath)) open.add(section.id);
   }
   return open;
 }
@@ -299,7 +265,7 @@ export function AppSidebar({ collapsed = false, onToggle }: AppSidebarProps) {
             );
           }
 
-          // Section avec sous-menus (accordéon)
+          // Section avec items directs (un seul niveau d'accordéon)
           return (
             <div key={section.id} className="px-2">
               {/* Bouton section principale */}
@@ -326,59 +292,26 @@ export function AppSidebar({ collapsed = false, onToggle }: AppSidebarProps) {
                 )}
               </button>
 
-              {/* Sous-menus — accordéon */}
+              {/* Items directs — un seul niveau */}
               {!collapsed && isOpen && (
                 <div className={`mt-1 ml-2 border-l-2 ${c.border} pl-2 space-y-0.5`}>
-                  {section.children.map(sub => {
-                    const subActive = subMenuHasActive(sub, location);
-                    const subOpen = openMenus.has(sub.id);
-                    const SubIcon = sub.icon;
-
+                  {section.children.map(leaf => {
+                    const leafActive = isLeafActive(leaf.path!, location);
+                    const LeafIcon = leaf.icon;
                     return (
-                      <div key={sub.id}>
-                        {/* Bouton sous-menu */}
-                        <button
-                          onClick={() => toggleSubMenu(sub.id)}
-                          className={`w-full flex items-center gap-2 px-3 py-2 rounded-lg transition-all duration-150 text-left group ${
-                            subActive || subOpen
-                              ? `${c.subActiveBg} ${c.subText}`
-                              : `${c.subText}/60 ${c.subBg}`
-                          }`}
-                        >
-                          <SubIcon className={`w-3.5 h-3.5 flex-shrink-0 ${subActive || subOpen ? c.subText : 'opacity-50'}`} />
-                          <span className="flex-1 text-xs font-semibold truncate">{sub.label}</span>
-                          <ChevronDown
-                            className={`w-3 h-3 flex-shrink-0 transition-transform duration-200 ${
-                              subOpen ? 'rotate-0' : '-rotate-90'
-                            } opacity-60`}
-                          />
-                        </button>
-
-                        {/* Items feuilles */}
-                        {subOpen && (
-                          <div className={`mt-0.5 ml-2 border-l ${c.border} pl-2 space-y-0.5`}>
-                            {sub.children.map(leaf => {
-                              const leafActive = isLeafActive(leaf.path, location);
-                              const LeafIcon = leaf.icon;
-                              return (
-                                <button
-                                  key={leaf.id}
-                                  onClick={() => navigate(leaf.path)}
-                                  className={`w-full flex items-center gap-2 px-3 py-1.5 rounded-lg transition-all duration-150 text-left group ${
-                                    leafActive
-                                      ? `${c.leafActiveBg} ${c.leafActiveText} shadow-sm`
-                                      : `${c.subText}/60 hover:bg-white/10 hover:${c.subText}`
-                                  }`}
-                                >
-                                  <LeafIcon className={`w-3 h-3 flex-shrink-0 ${leafActive ? 'text-white' : 'opacity-50'}`} />
-                                  <span className="flex-1 text-xs truncate">{leaf.label}</span>
-                                  {leafActive && <span className={`w-1.5 h-1.5 rounded-full flex-shrink-0 ${c.dot}`} />}
-                                </button>
-                              );
-                            })}
-                          </div>
-                        )}
-                      </div>
+                      <button
+                        key={leaf.id}
+                        onClick={() => navigate(leaf.path!)}
+                        className={`w-full flex items-center gap-2 px-3 py-2 rounded-lg transition-all duration-150 text-left group ${
+                          leafActive
+                            ? `${c.leafActiveBg} ${c.leafActiveText} shadow-sm`
+                            : `${c.subText}/70 ${c.subBg}`
+                        }`}
+                      >
+                        <LeafIcon className={`w-3.5 h-3.5 flex-shrink-0 ${leafActive ? 'text-white' : 'opacity-60'}`} />
+                        <span className="flex-1 text-xs truncate">{leaf.label}</span>
+                        {leafActive && <span className={`w-1.5 h-1.5 rounded-full flex-shrink-0 ${c.dot}`} />}
+                      </button>
                     );
                   })}
                 </div>