diff --git a/client/src/components/DashboardLayout.tsx b/client/src/components/DashboardLayout.tsx
index 3b32147..266380f 100644
--- a/client/src/components/DashboardLayout.tsx
+++ b/client/src/components/DashboardLayout.tsx
@@ -27,16 +27,41 @@ import { useLocation } from "wouter";
 import { DashboardLayoutSkeleton } from './DashboardLayoutSkeleton';
 import { Button } from "./ui/button";
 
-// Couleurs par catégorie de menu
+// Couleurs et styles par catégorie de menu
 const getCategoryColor = (sectionTitle: string) => {
   const colors: Record<string, string> = {
-    "Tableau de bord": "text-blue-600",
-    "Gestion": "text-green-600",
-    "Configuration": "text-orange-600",
-    "Traçabilité": "text-purple-600",
-    "Analyses": "text-pink-600",
+    "Tableau de bord": "text-blue-500",
+    "Gestion": "text-green-500",
+    "Configuration": "text-orange-500",
+    "Traçabilité": "text-purple-500",
+    "Analyses": "text-pink-500",
+    "Gestion technique": "text-red-500",
   };
-  return colors[sectionTitle] || "";
+  return colors[sectionTitle] || "text-gray-500";
+};
+
+const getCategoryGradient = (sectionTitle: string) => {
+  const gradients: Record<string, string> = {
+    "Tableau de bord": "from-blue-300 to-blue-400",
+    "Gestion": "from-green-300 to-emerald-400",
+    "Configuration": "from-orange-300 to-orange-400",
+    "Traçabilité": "from-purple-300 to-purple-400",
+    "Analyses": "from-pink-300 to-pink-400",
+    "Gestion technique": "from-red-300 to-red-400",
+  };
+  return gradients[sectionTitle] || "from-gray-300 to-gray-400";
+};
+
+const getCategoryBgColor = (sectionTitle: string) => {
+  const bgColors: Record<string, string> = {
+    "Tableau de bord": "bg-blue-50/80 hover:bg-blue-100/90",
+    "Gestion": "bg-green-50/80 hover:bg-green-100/90",
+    "Configuration": "bg-orange-50/80 hover:bg-orange-100/90",
+    "Traçabilité": "bg-purple-50/80 hover:bg-purple-100/90",
+    "Analyses": "bg-pink-50/80 hover:bg-pink-100/90",
+    "Gestion technique": "bg-red-50/80 hover:bg-red-100/90",
+  };
+  return bgColors[sectionTitle] || "bg-gray-50/80 hover:bg-gray-100/90";
 };
 
 const menuSections = [
@@ -369,19 +394,29 @@ function DashboardLayoutContent({
                   )}
                   <button
                     onClick={() => toggleSection(section.title)}
-                    className="w-full px-4 py-2 flex items-center justify-between hover:bg-accent/50 transition-colors rounded-md mx-2 focus:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+                    className={`w-full px-3 py-3 flex items-center justify-between ${getCategoryBgColor(section.title)} transition-all duration-300 rounded-lg mx-2 focus:outline-none focus-visible:ring-2 focus-visible:ring-ring border-l-4 ${isOpen ? 'border-l-' + section.title.toLowerCase().replace(/ /g, '-') : 'border-l-transparent'} shadow-sm hover:shadow-md hover:translate-x-1`}
+                    style={{
+                      borderLeftColor: isOpen ? `var(--${section.title.toLowerCase().replace(/ /g, '-')}-color, currentColor)` : 'transparent'
+                    }}
                   >
-                    <h3 className={`text-xs font-semibold uppercase tracking-wider ${getCategoryColor(section.title)}`}>
-                      {section.title}
-                    </h3>
+                    <div className="flex items-center gap-3">
+                      <div className={`p-1.5 rounded-lg bg-gradient-to-br ${getCategoryGradient(section.title)} shadow-md transition-transform duration-300 ${isOpen ? 'scale-110 rotate-6' : ''}`}>
+                        <div className="w-3 h-3 bg-white/30 rounded-sm" />
+                      </div>
+                      <h3 className={`text-xs font-bold uppercase tracking-wider ${getCategoryColor(section.title)}`}>
+                        {section.title}
+                      </h3>
+                    </div>
                     <ChevronDown 
-                      className={`h-3 w-3 transition-transform duration-200 ${getCategoryColor(section.title)} ${
-                        isOpen ? 'rotate-180' : ''
+                      className={`h-4 w-4 transition-all duration-300 ${getCategoryColor(section.title)} ${
+                        isOpen ? 'rotate-180 scale-110' : ''
                       }`}
                     />
                   </button>
-                  {isOpen && (
-                    <SidebarMenu className="px-2 py-1">
+                  <div className={`overflow-hidden transition-all duration-300 ease-in-out ${
+                    isOpen ? 'max-h-[2000px] opacity-100' : 'max-h-0 opacity-0'
+                  }`}>
+                    <SidebarMenu className="px-2 py-1 animate-in slide-in-from-top-2">
                       {section.items.map(item => {
                         const isActive = location === item.path;
                         const hasSubItems = 'subItems' in item && item.subItems && Array.isArray(item.subItems) && item.subItems.length > 0;
@@ -393,11 +428,21 @@ function DashboardLayoutContent({
                                 isActive={isActive || Boolean(isSubItemActive)}
                                 onClick={() => setLocation(item.path)}
                                 tooltip={item.label}
-                                className={`h-10 transition-all font-normal`}
+                                className={`h-11 transition-all duration-300 font-normal hover:translate-x-2 hover:shadow-md ${
+                                  isActive || isSubItemActive 
+                                    ? `bg-gradient-to-r ${getCategoryGradient(section.title)} text-white shadow-lg scale-105 border-l-4 border-white/30` 
+                                    : 'hover:bg-accent/70'
+                                }`}
                               >
-                                <item.icon
-                                  className={`h-4 w-4 ${isActive || isSubItemActive ? "text-primary" : getCategoryColor(section.title)}`}
-                                />
+                                <div className={`p-1.5 rounded-md transition-all duration-300 ${
+                                  isActive || isSubItemActive 
+                                    ? 'bg-white/20 scale-110' 
+                                    : `bg-gradient-to-br ${getCategoryGradient(section.title)}`
+                                }`}>
+                                  <item.icon
+                                    className={`h-4 w-4 ${isActive || isSubItemActive ? "text-white" : "text-white"}`}
+                                  />
+                                </div>
                                 <span>{item.label}</span>
                               </SidebarMenuButton>
                             </SidebarMenuItem>
@@ -424,7 +469,7 @@ function DashboardLayoutContent({
                         );
                       })}
                     </SidebarMenu>
-                  )}
+                  </div>
                 </div>
               );
             })}
diff --git a/client/src/pages/FormateurEmargement.tsx b/client/src/pages/FormateurEmargement.tsx
index 7fd1f88..3dc01f4 100644
--- a/client/src/pages/FormateurEmargement.tsx
+++ b/client/src/pages/FormateurEmargement.tsx
@@ -221,7 +221,8 @@ export default function FormateurEmargement() {
 
                     {/* Dates de formation */}
                     <div className="space-y-2">
-                      {inscrit.dates?.map((date: any) => {
+                      {inscrit.dates && Array.isArray(inscrit.dates) && inscrit.dates.length > 0 ? inscrit.dates.map((date: any) => {
+                        if (!date || !date.id) return null;
                         const present = isPresent(inscrit.inscription.id, date.id);
                         return (
                           <div
@@ -264,7 +265,11 @@ export default function FormateurEmargement() {
                             )}
                           </div>
                         );
-                      })}
+                      }) : (
+                        <p className="text-sm text-muted-foreground py-2">
+                          Aucune date de formation disponible
+                        </p>
+                      )}
                     </div>
                   </div>
                 ))}
diff --git a/todo.md b/todo.md
index f08c5f2..22e0e94 100644
--- a/todo.md
+++ b/todo.md
@@ -1003,4 +1003,21 @@
 - [x] Implémenter animations au survol et au chargement
 - [x] Améliorer la palette de couleurs
 - [x] Tester sur sandbox
+- [x] Déployer après validation utilisateur
+
+## Refonte ergonomie du menu latéral accordéon
+
+- [x] Analyser le menu latéral actuel (DashboardLayout.tsx)
+- [x] Créer nouvelle version avec icônes colorées et animations
+- [x] Ajouter effets hover et transitions fluides
+- [x] Implémenter indicateur de page active
+- [x] Améliorer les couleurs et gradients
+- [x] Tester sur sandbox
 - [ ] Déployer après validation utilisateur
+
+## Correction bug page émargement formateur
+
+- [x] Analyser l'erreur "Cannot convert undefined or null to object"
+- [x] Identifier la requête tRPC qui échoue
+- [x] Corriger le bug
+- [x] Tester la correction