diff --git a/client/src/pages/AdminGestionAttestations.tsx b/client/src/pages/AdminGestionAttestations.tsx
index ff1c707..e065f25 100644
--- a/client/src/pages/AdminGestionAttestations.tsx
+++ b/client/src/pages/AdminGestionAttestations.tsx
@@ -58,103 +58,196 @@ function UploadAttestationDialog({
 
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
-      <DialogContent>
-        <DialogHeader>
-          <DialogTitle>Charger une attestation</DialogTitle>
-          <DialogDescription>
-            Sélectionnez un fichier PDF à uploader pour cet apprenant
+      <DialogContent className="sm:max-w-[500px]">
+        <DialogHeader className="space-y-3">
+          <div className="mx-auto w-16 h-16 bg-gradient-to-br from-blue-500 to-purple-600 rounded-2xl flex items-center justify-center shadow-lg">
+            <Upload className="w-8 h-8 text-white" />
+          </div>
+          <DialogTitle className="text-2xl font-bold text-center bg-gradient-to-r from-blue-600 to-purple-600 bg-clip-text text-transparent">
+            Charger une attestation
+          </DialogTitle>
+          <DialogDescription className="text-center text-base">
+            Sélectionnez un fichier PDF pour cet apprenant
           </DialogDescription>
         </DialogHeader>
-        <div className="space-y-4">
-          <div>
-            <Label>Fichier PDF</Label>
-            <input
-              type="file"
-              accept=".pdf"
-              onChange={async (e) => {
-                const file = e.target.files?.[0];
-                if (!file) return;
-
-                if (file.type !== 'application/pdf') {
-                  toast.error('Seuls les fichiers PDF sont acceptés');
-                  return;
+        
+        <div className="space-y-6 py-4">
+          <div className="relative">
+            <label className="block">
+              <div className={`
+                relative border-3 border-dashed rounded-2xl p-8 text-center cursor-pointer
+                transition-all duration-300 ease-in-out
+                ${
+                  uploading 
+                    ? 'border-blue-400 bg-blue-50' 
+                    : fileData 
+                    ? 'border-green-400 bg-green-50 hover:bg-green-100' 
+                    : 'border-gray-300 bg-gray-50 hover:border-blue-400 hover:bg-blue-50'
                 }
+              `}>
+                {!fileData && !uploading && (
+                  <div className="space-y-4">
+                    <div className="mx-auto w-20 h-20 bg-gradient-to-br from-blue-100 to-purple-100 rounded-full flex items-center justify-center">
+                      <FileText className="w-10 h-10 text-blue-600" />
+                    </div>
+                    <div>
+                      <p className="text-lg font-semibold text-gray-700 mb-1">
+                        Cliquez pour choisir un fichier
+                      </p>
+                      <p className="text-sm text-gray-500">
+                        ou glissez-déposez votre PDF ici
+                      </p>
+                    </div>
+                    <div className="flex items-center justify-center gap-2 text-xs text-gray-400">
+                      <span className="px-3 py-1 bg-white rounded-full border border-gray-200">
+                        PDF uniquement
+                      </span>
+                      <span className="px-3 py-1 bg-white rounded-full border border-gray-200">
+                        Max 10 Mo
+                      </span>
+                    </div>
+                  </div>
+                )}
+                
+                {uploading && (
+                  <div className="space-y-4">
+                    <div className="mx-auto w-20 h-20 bg-gradient-to-br from-blue-500 to-purple-600 rounded-full flex items-center justify-center animate-pulse">
+                      <Upload className="w-10 h-10 text-white" />
+                    </div>
+                    <div>
+                      <p className="text-lg font-semibold text-blue-600 mb-2">
+                        Upload en cours...
+                      </p>
+                      <div className="w-full max-w-xs mx-auto">
+                        <div className="flex justify-between text-sm text-gray-600 mb-2">
+                          <span className="font-medium">Progression</span>
+                          <span className="font-bold text-blue-600">{uploadProgress}%</span>
+                        </div>
+                        <div className="w-full bg-gray-200 rounded-full h-3 overflow-hidden shadow-inner">
+                          <div 
+                            className="h-full bg-gradient-to-r from-blue-500 to-purple-600 rounded-full transition-all duration-300 ease-out shadow-lg"
+                            style={{ width: `${uploadProgress}%` }}
+                          />
+                        </div>
+                      </div>
+                    </div>
+                  </div>
+                )}
+                
+                {fileData && !uploading && (
+                  <div className="space-y-4">
+                    <div className="mx-auto w-20 h-20 bg-gradient-to-br from-green-500 to-emerald-600 rounded-full flex items-center justify-center">
+                      <FileText className="w-10 h-10 text-white" />
+                    </div>
+                    <div>
+                      <p className="text-lg font-semibold text-green-600 mb-1">
+                        ✓ Fichier prêt
+                      </p>
+                      <p className="text-sm text-gray-600 font-medium break-all px-4">
+                        {fileData.nomFichier}
+                      </p>
+                      <p className="text-xs text-gray-400 mt-2">
+                        {(fileData.tailleFichier / 1024 / 1024).toFixed(2)} Mo
+                      </p>
+                    </div>
+                    <Button 
+                      variant="ghost" 
+                      size="sm"
+                      className="text-blue-600 hover:text-blue-700 hover:bg-blue-50"
+                      onClick={(e) => {
+                        e.preventDefault();
+                        setFileData(null);
+                      }}
+                    >
+                      Changer de fichier
+                    </Button>
+                  </div>
+                )}
+              </div>
+              
+              <input
+                type="file"
+                accept=".pdf"
+                className="hidden"
+                disabled={uploading}
+                onChange={async (e) => {
+                  const file = e.target.files?.[0];
+                  if (!file) return;
 
-                if (file.size > 10 * 1024 * 1024) {
-                  toast.error('Le fichier ne doit pas dépasser 10 Mo');
-                  return;
-                }
-
-                setUploading(true);
-                setUploadProgress(0);
-                try {
-                  const formData = new FormData();
-                  formData.append('file', file);
-
-                  // Simuler la progression de l'upload
-                  const progressInterval = setInterval(() => {
-                    setUploadProgress(prev => {
-                      if (prev >= 90) return prev;
-                      return prev + 10;
-                    });
-                  }, 200);
-
-                  const response = await fetch('/api/upload-file', {
-                    method: 'POST',
-                    body: formData,
-                  });
-
-                  clearInterval(progressInterval);
-                  setUploadProgress(100);
-
-                  if (!response.ok) {
-                    throw new Error('Erreur lors de l\'upload');
+                  if (file.type !== 'application/pdf') {
+                    toast.error('Seuls les fichiers PDF sont acceptés');
+                    return;
                   }
 
-                  const data = await response.json();
-                  setFileData({
-                    nomFichier: file.name,
-                    urlFichier: data.url,
-                    s3Key: data.key,
-                    typeFichier: file.type,
-                    tailleFichier: file.size,
-                  });
-                  toast.success('Fichier uploadé avec succès');
-                } catch (error) {
-                  toast.error('Erreur lors de l\'upload du fichier');
+                  if (file.size > 10 * 1024 * 1024) {
+                    toast.error('Le fichier ne doit pas dépasser 10 Mo');
+                    return;
+                  }
+
+                  setUploading(true);
                   setUploadProgress(0);
-                } finally {
-                  setUploading(false);
-                }
-              }}
-              className="block w-full text-sm text-gray-500 file:mr-4 file:py-2 file:px-4 file:rounded-md file:border-0 file:text-sm file:font-semibold file:bg-primary file:text-primary-foreground hover:file:bg-primary/90"
-            />
-            {uploading && (
-              <div className="mt-4">
-                <div className="flex justify-between text-sm text-muted-foreground mb-1">
-                  <span>Upload en cours...</span>
-                  <span>{uploadProgress}%</span>
-                </div>
-                <div className="w-full bg-gray-200 rounded-full h-2.5">
-                  <div 
-                    className="bg-blue-600 h-2.5 rounded-full transition-all duration-300"
-                    style={{ width: `${uploadProgress}%` }}
-                  />
-                </div>
-              </div>
-            )}
-            {fileData && !uploading && (
-              <p className="text-sm text-muted-foreground mt-2">
-                Fichier sélectionné : {fileData.nomFichier}
-              </p>
-            )}
+                  try {
+                    const formData = new FormData();
+                    formData.append('file', file);
+
+                    const progressInterval = setInterval(() => {
+                      setUploadProgress(prev => {
+                        if (prev >= 90) return prev;
+                        return prev + 10;
+                      });
+                    }, 200);
+
+                    const response = await fetch('/api/upload-file', {
+                      method: 'POST',
+                      body: formData,
+                    });
+
+                    clearInterval(progressInterval);
+                    setUploadProgress(100);
+
+                    if (!response.ok) {
+                      throw new Error('Erreur lors de l\'upload');
+                    }
+
+                    const data = await response.json();
+                    setFileData({
+                      nomFichier: file.name,
+                      urlFichier: data.url,
+                      s3Key: data.key,
+                      typeFichier: file.type,
+                      tailleFichier: file.size,
+                    });
+                    toast.success('Fichier uploadé avec succès');
+                  } catch (error) {
+                    toast.error('Erreur lors de l\'upload du fichier');
+                    setUploadProgress(0);
+                  } finally {
+                    setUploading(false);
+                  }
+                }}
+              />
+            </label>
           </div>
-          <div className="flex justify-end gap-2">
-            <Button variant="outline" onClick={() => onOpenChange(false)} disabled={uploading}>
+
+          <div className="flex justify-end gap-3 pt-2">
+            <Button 
+              variant="outline" 
+              onClick={() => {
+                onOpenChange(false);
+                setFileData(null);
+                setUploadProgress(0);
+              }} 
+              disabled={uploading}
+              className="px-6 border-2 hover:bg-gray-50"
+            >
               Annuler
             </Button>
-            <Button onClick={handleUpload} disabled={!fileData || uploading}>
-              {uploading ? 'Chargement...' : 'Valider'}
+            <Button 
+              onClick={handleUpload} 
+              disabled={!fileData || uploading}
+              className="px-8 bg-gradient-to-r from-blue-600 to-purple-600 hover:from-blue-700 hover:to-purple-700 text-white font-semibold shadow-lg hover:shadow-xl transition-all duration-300"
+            >
+              {uploading ? 'Chargement...' : '✓ Valider'}
             </Button>
           </div>
         </div>
diff --git a/todo.md b/todo.md
index 2d725f0..03ca18c 100644
--- a/todo.md
+++ b/todo.md
@@ -1460,3 +1460,5 @@
 - [x] Intégrer le template dans le code d'envoi des attestations
 - [x] Déployer sur VPS (migration SQL + fichiers)
 - [x] Créer un checkpoint
+
+- [x] Moderniser l'interface de chargement des attestations (design coloré et ergonomique)