diff --git a/client/src/components/SalesHistory.tsx b/client/src/components/SalesHistory.tsx
index 46c244c..ccee8a5 100644
--- a/client/src/components/SalesHistory.tsx
+++ b/client/src/components/SalesHistory.tsx
@@ -157,6 +157,70 @@ export default function SalesHistory({ canDelete = false }: SalesHistoryProps) {
     }
   };
 
+  const exportToCSV = () => {
+    if (filteredSales.length === 0) {
+      toast({
+        title: "Aucune donnée",
+        description: "Aucune vente à exporter",
+        variant: "destructive",
+      });
+      return;
+    }
+
+    try {
+      const headers = [
+        'Date', 'Vendeur', 'Nom', 'Prénom', 'Date de naissance', 'Lieu de naissance',
+        'Type article', 'Catégorie', 'Quantité', 'Gencode', 'Mode de paiement',
+        'Type identité', 'Numéro identité', 'Autorité délivrance', 'Date délivrance'
+      ];
+
+      const csvData = filteredSales.map(sale => [
+        new Date(sale.timestamp).toLocaleDateString('fr-FR'),
+        sale.vendeur,
+        sale.nom,
+        sale.prenom,
+        new Date(sale.dateNaissance).toLocaleDateString('fr-FR'),
+        sale.lieuNaissance || '',
+        sale.typeArticle,
+        sale.categorie,
+        sale.quantite,
+        sale.gencode,
+        sale.modePaiement,
+        sale.typeIdentite,
+        sale.numeroIdentite,
+        sale.autoriteDelivrance || '',
+        new Date(sale.dateDelivrance).toLocaleDateString('fr-FR')
+      ]);
+
+      const csvContent = [headers, ...csvData]
+        .map(row => row.map(field => `"${field}"`).join(';'))
+        .join('\n');
+
+      const blob = new Blob(['\ufeff' + csvContent], { type: 'text/csv;charset=utf-8;' });
+      const link = document.createElement('a');
+      const url = URL.createObjectURL(blob);
+      link.setAttribute('href', url);
+      link.setAttribute('download', `ventes-feux-artifice-${new Date().toISOString().split('T')[0]}.csv`);
+      link.style.visibility = 'hidden';
+      document.body.appendChild(link);
+      link.click();
+      document.body.removeChild(link);
+
+      toast({
+        title: "Export réussi",
+        description: "Le fichier CSV a été téléchargé",
+        variant: "success",
+      });
+    } catch (error) {
+      console.error('Erreur lors de l\'export CSV:', error);
+      toast({
+        title: "Erreur d'export",
+        description: "Impossible de générer le fichier CSV",
+        variant: "destructive",
+      });
+    }
+  };
+
   const clearFilters = () => {
     setStartDate('');
     setEndDate('');
@@ -264,14 +328,24 @@ export default function SalesHistory({ canDelete = false }: SalesHistoryProps) {
                 </div>
               )}
             </div>
-            <button
-              onClick={exportToPDF}
-              disabled={filteredSales.length === 0}
-              className="modern-button modern-button-primary"
-            >
-              <Download className="h-4 w-4" />
-              Exporter en PDF
-            </button>
+            <div className="flex gap-2">
+              <button
+                onClick={exportToPDF}
+                disabled={filteredSales.length === 0}
+                className="modern-button modern-button-primary"
+              >
+                <FileText className="h-4 w-4" />
+                Export PDF
+              </button>
+              <button
+                onClick={exportToCSV}
+                disabled={filteredSales.length === 0}
+                className="modern-button modern-button-secondary"
+              >
+                <Download className="h-4 w-4" />
+                Export CSV
+              </button>
+            </div>
           </div>
         </div>
       </div>
diff --git a/client/src/index.css b/client/src/index.css
index 013af38..22d22ea 100644
--- a/client/src/index.css
+++ b/client/src/index.css
@@ -246,11 +246,11 @@ body {
 /* Module de recherche */
 .search-container {
   background: white;
-  border: 1px solid hsl(var(--border));
+  border: 2px solid hsl(var(--primary) / 0.3);
   border-radius: 12px;
   padding: 20px;
   margin-bottom: 24px;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
 }
 
 .search-header {
@@ -283,10 +283,11 @@ body {
 /* Filtres élégants */
 .filters-container {
   background: hsl(var(--muted) / 0.5);
-  border: 1px solid hsl(var(--border));
+  border: 2px solid hsl(var(--border));
   border-radius: 12px;
   padding: 20px;
   margin-bottom: 24px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
 }
 
 .filters-grid {
@@ -421,6 +422,19 @@ body {
   animation: slideIn 0.3s ease-out;
 }
 
+/* Sections avec cadres visibles */
+.section-vendor,
+.section-product,
+.section-client,
+.section-identity {
+  border: 2px solid hsl(var(--border));
+  border-radius: 12px;
+  padding: 20px;
+  margin-bottom: 24px;
+  background: white;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
+}
+
 /* Responsive design */
 @media (max-width: 768px) {
   .section-vendor,
@@ -428,6 +442,7 @@ body {
   .section-client,
   .section-identity {
     padding: 16px;
+    margin-bottom: 16px;
   }
   
   .filters-grid {
diff --git a/replit.md b/replit.md
index 5529c34..5b2ffad 100644
--- a/replit.md
+++ b/replit.md
@@ -220,6 +220,20 @@ Preferred communication style: Simple, everyday language.
 - ✅ Safety confirmation dialogs for manual purge operations
 - ✅ Real-time monitoring of data retention status with visual indicators
 
+### Modern UI Design & Advanced Search (January 10, 2025)
+- ✅ Complete UI redesign with modern, elegant design system
+- ✅ Enhanced visual borders and frames throughout the application for better visibility
+- ✅ Colored sections with animations and smooth transitions
+- ✅ Made "autorité de délivrance" field optional in new sale form as requested
+- ✅ Added comprehensive search module in sales history with multi-field filtering
+- ✅ Real-time search across names, sellers, articles, codes, payment methods, and birth places
+- ✅ Added CSV export functionality alongside existing PDF export
+- ✅ Visible section frames around each category in new sale form
+- ✅ Enhanced cards and containers with stronger visual borders
+- ✅ Improved responsive design for mobile and tablet devices
+- ✅ Modern search interface with clear result counting and active search indicators
+- ✅ Dual export options (PDF and CSV) for regulatory compliance reporting
+
 ### Docker Configuration & Cleanup (January 9, 2025)
 - ✅ Complete Docker setup optimized for external PostgreSQL database
 - ✅ Docker Compose configuration with RegisFlow application only