diff --git a/public/site/blueprints/pages/client-brief.yml b/public/site/blueprints/pages/client-brief.yml
index 7574be8..9df9168 100644
--- a/public/site/blueprints/pages/client-brief.yml
+++ b/public/site/blueprints/pages/client-brief.yml
@@ -24,6 +24,17 @@ tabs:
             type: hidden
           isValidated:
             type: hidden
+          # Champs pour notification "content" (brief validé)
+          validatedBy:
+            type: hidden
+          validatedByName:
+            type: hidden
+          validatedByEmail:
+            type: hidden
+          validatedAt:
+            type: hidden
+          validationReadby:
+            type: hidden
           pdf:
             label: PDF
             type: files
diff --git a/public/site/blueprints/pages/extended-brief.yml b/public/site/blueprints/pages/extended-brief.yml
index b65d99f..477d4a1 100644
--- a/public/site/blueprints/pages/extended-brief.yml
+++ b/public/site/blueprints/pages/extended-brief.yml
@@ -22,6 +22,19 @@ tabs:
         fields:
           stepName:
             type: hidden
+          isValidated:
+            type: hidden
+          # Champs pour notification "content" (brief validé)
+          validatedBy:
+            type: hidden
+          validatedByName:
+            type: hidden
+          validatedByEmail:
+            type: hidden
+          validatedAt:
+            type: hidden
+          validationReadby:
+            type: hidden
           pdf:
             label: PDF
             type: files
diff --git a/public/site/blueprints/pages/project.yml b/public/site/blueprints/pages/project.yml
index 946e238..6962aa5 100644
--- a/public/site/blueprints/pages/project.yml
+++ b/public/site/blueprints/pages/project.yml
@@ -21,6 +21,7 @@ tabs:
         fields:
           lastCacheUpdate:
             type: hidden
+          # Champs pour project-request
           isClientRequest:
             type: hidden
             default: "false"
@@ -30,6 +31,32 @@ tabs:
             disabled: true
             when:
               isClientRequest: "true"
+          requestAuthor:
+            type: hidden
+          requestAuthorName:
+            type: hidden
+          requestAuthorEmail:
+            type: hidden
+          requestDate:
+            type: hidden
+          requestReadby:
+            type: hidden
+          # Champs pour appointment-request (DTL)
+          hasOptimizationRequest:
+            type: hidden
+            default: "false"
+          optimizationRequestDetails:
+            type: hidden
+          optimizationAuthor:
+            type: hidden
+          optimizationAuthorName:
+            type: hidden
+          optimizationAuthorEmail:
+            type: hidden
+          optimizationDate:
+            type: hidden
+          optimizationReadby:
+            type: hidden
           currentStep:
             label: Étape en cours
             type: radio
diff --git a/public/site/config/config.php b/public/site/config/config.php
index 72ea0da..37f3a33 100644
--- a/public/site/config/config.php
+++ b/public/site/config/config.php
@@ -40,6 +40,7 @@ return [
     require(__DIR__ . '/routes/validate-brief.php'),
     require(__DIR__ . '/routes/request-project-creation.php'),
     require(__DIR__ . '/routes/request-optimization-appointment.php'),
+    require(__DIR__ . '/routes/migrate-notifications.php'),
   ],
   'hooks' => [
     'page.create:after'  => require_once(__DIR__ . '/hooks/create-steps.php'),
diff --git a/public/site/config/routes/migrate-notifications.php b/public/site/config/routes/migrate-notifications.php
new file mode 100644
index 0000000..3aa033c
--- /dev/null
+++ b/public/site/config/routes/migrate-notifications.php
@@ -0,0 +1,175 @@
+<?php
+
+/**
+ * Script de migration unique pour le système de notifications dérivées.
+ *
+ * Ce script copie les `readby[]` des anciennes notifications vers les sources de données.
+ * À exécuter une seule fois après le déploiement, puis à supprimer.
+ *
+ * Usage: POST /migrate-notifications.json
+ */
+
+return [
+  'pattern' => 'migrate-notifications.json',
+  'method' => 'POST',
+  'action' => function () {
+    $user = kirby()->user();
+
+    // Vérifier que l'utilisateur est admin
+    if (!$user || $user->role()->id() !== 'admin') {
+      return [
+        'status' => 'error',
+        'message' => 'Cette action nécessite les droits administrateur.'
+      ];
+    }
+
+    $migrated = [
+      'comments' => 0,
+      'replies' => 0,
+      'project-requests' => 0,
+      'appointment-requests' => 0,
+      'content' => 0,
+      'errors' => []
+    ];
+
+    $projects = page('projects')->children();
+
+    foreach ($projects as $project) {
+      // Récupérer les anciennes notifications
+      $notifications = $project->notifications()->yaml() ?? [];
+
+      if (empty($notifications)) {
+        continue;
+      }
+
+      foreach ($notifications as $notification) {
+        try {
+          $type = $notification['type'] ?? 'comment';
+          $id = $notification['id'] ?? null;
+          $readby = $notification['readby'] ?? [];
+
+          if (empty($id) || empty($readby)) {
+            continue;
+          }
+
+          switch ($type) {
+            case 'comment':
+            case 'comment-reply':
+              $fileUuid = $notification['location']['file']['uuid'] ?? null;
+              if (!$fileUuid) continue 2;
+
+              $file = kirby()->file($fileUuid);
+              if (!$file) continue 2;
+
+              $comments = Yaml::decode($file->comments()->value()) ?? [];
+              $updated = false;
+
+              foreach ($comments as &$comment) {
+                // Vérifier si c'est le commentaire principal
+                if ($comment['id'] === $id) {
+                  $existingReadby = $comment['readby'] ?? [];
+                  $comment['readby'] = array_values(array_unique(array_merge($existingReadby, $readby)));
+                  $updated = true;
+                  $migrated['comments']++;
+                  break;
+                }
+
+                // Vérifier dans les réponses
+                foreach ($comment['replies'] ?? [] as &$reply) {
+                  if ($reply['id'] === $id) {
+                    $existingReadby = $reply['readby'] ?? [];
+                    $reply['readby'] = array_values(array_unique(array_merge($existingReadby, $readby)));
+                    $updated = true;
+                    $migrated['replies']++;
+                    break 2;
+                  }
+                }
+              }
+
+              if ($updated) {
+                $file->update(['comments' => $comments]);
+              }
+              break;
+
+            case 'project-request':
+              $existingReadby = $project->requestReadby()->yaml() ?? [];
+              $newReadby = array_values(array_unique(array_merge($existingReadby, $readby)));
+
+              $updateData = ['requestReadby' => $newReadby];
+
+              // Migrer aussi les métadonnées si elles n'existent pas encore
+              if ($project->requestAuthor()->isEmpty() && isset($notification['author'])) {
+                $updateData['requestAuthor'] = $notification['author']['uuid'] ?? '';
+                $updateData['requestAuthorName'] = $notification['author']['name'] ?? '';
+                $updateData['requestAuthorEmail'] = $notification['author']['email'] ?? '';
+                $updateData['requestDate'] = $notification['date'] ?? '';
+              }
+
+              $project->update($updateData);
+              $migrated['project-requests']++;
+              break;
+
+            case 'appointment-request':
+              $existingReadby = $project->optimizationReadby()->yaml() ?? [];
+              $newReadby = array_values(array_unique(array_merge($existingReadby, $readby)));
+
+              $updateData = ['optimizationReadby' => $newReadby];
+
+              // Migrer aussi les métadonnées si elles n'existent pas encore
+              if ($project->optimizationAuthor()->isEmpty() && isset($notification['author'])) {
+                $updateData['optimizationAuthor'] = $notification['author']['uuid'] ?? '';
+                $updateData['optimizationAuthorName'] = $notification['author']['name'] ?? '';
+                $updateData['optimizationAuthorEmail'] = $notification['author']['email'] ?? '';
+                $updateData['optimizationDate'] = $notification['date'] ?? '';
+              }
+
+              $project->update($updateData);
+              $migrated['appointment-requests']++;
+              break;
+
+            case 'content':
+              $briefUri = $notification['location']['page']['uri'] ?? null;
+              if (!$briefUri) continue 2;
+
+              $brief = page($briefUri);
+              if (!$brief) continue 2;
+
+              $existingReadby = $brief->validationReadby()->yaml() ?? [];
+              $newReadby = array_values(array_unique(array_merge($existingReadby, $readby)));
+
+              $updateData = ['validationReadby' => $newReadby];
+
+              // Migrer aussi les métadonnées si elles n'existent pas encore
+              if ($brief->validatedBy()->isEmpty() && isset($notification['author'])) {
+                $updateData['validatedBy'] = $notification['author']['uuid'] ?? '';
+                $updateData['validatedByName'] = $notification['author']['name'] ?? '';
+                $updateData['validatedByEmail'] = $notification['author']['email'] ?? '';
+                $updateData['validatedAt'] = $notification['date'] ?? '';
+              }
+
+              $brief->update($updateData);
+              $migrated['content']++;
+              break;
+          }
+        } catch (\Throwable $th) {
+          $migrated['errors'][] = [
+            'project' => $project->title()->value(),
+            'notification_id' => $id ?? 'unknown',
+            'type' => $type ?? 'unknown',
+            'error' => $th->getMessage()
+          ];
+        }
+      }
+    }
+
+    $total = $migrated['comments'] + $migrated['replies'] +
+             $migrated['project-requests'] + $migrated['appointment-requests'] +
+             $migrated['content'];
+
+    return [
+      'status' => 'success',
+      'message' => "Migration terminée. $total notifications migrées.",
+      'details' => $migrated
+    ];
+  }
+];
diff --git a/public/site/config/routes/request-optimization-appointment.php b/public/site/config/routes/request-optimization-appointment.php
index 0cc94c0..d1e4b84 100644
--- a/public/site/config/routes/request-optimization-appointment.php
+++ b/public/site/config/routes/request-optimization-appointment.php
@@ -7,37 +7,26 @@ return [
     $json = file_get_contents('php://input');
     $data = json_decode($json);
 
-    $user = kirby()->user();    
+    $user = kirby()->user();
     $project = page($data->projectUri);
 
+    $date = new DateTime();
+    $formattedDate = $date->format(DateTime::ISO8601);
+
     try {
-      $newProject = $project->update([
+      $project->update([
         "hasOptimizationRequest" => "true",
-        "optimizationRequestDetails" => esc("De la part de " . kirby()->user()->name() . " (" . kirby()->user()->email() . ") : \n\n" . "Objet : " . $data->subject . "\n" . $data->details)
+        "optimizationRequestDetails" => esc("De la part de " . $user->name() . " (" . $user->email() . ") : \n\n" . "Objet : " . $data->subject . "\n" . $data->details),
+        // Métadonnées pour le système de notifications dérivées
+        "optimizationAuthor" => (string) $user->uuid(),
+        "optimizationAuthorName" => (string) $user->name(),
+        "optimizationAuthorEmail" => (string) $user->email(),
+        "optimizationDate" => $formattedDate,
+        "optimizationReadby" => [],
       ]);
-    } catch (\Throwable $th) {
-      return [
-        "status" => "error",
-        "message" => "Can't update project " . $project->title()->value() . ". " . $th->getMessage() . " in " . $th->getFile() . " line " . $th->getLine()
-      ];
-    }
 
-    try {
-      $date = new DateTime();
-      $formattedDate = $date->format(DateTime::ISO8601);
-
-      $notificationData = [
-        "location" => [
-          "page" => $newProject
-        ],
-        "date" => (string) $formattedDate,
-        "text" => nl2br("Objet : " . $data->subject . "\n" .  esc($data->details)),
-        "author" => $user,
-        "id" => Str::uuid(),
-        "type" => "appointment-request",
-      ];
-
-      $newProject->createNotification($notificationData);
+      // Note: Les notifications sont maintenant dérivées.
+      // Plus besoin d'appeler createNotification().
 
       return [
         "status" => "success",
@@ -45,7 +34,7 @@ return [
     } catch (\Throwable $th) {
       return [
         "status" => "error",
-        "message" => "Can't create notification. " . $th->getMessage() . " in " . $th->getFile() . " line " . $th->getLine()
+        "message" => "Can't update project " . $project->title()->value() . ". " . $th->getMessage() . " in " . $th->getFile() . " line " . $th->getLine()
       ];
     }
   }
diff --git a/public/site/config/routes/request-project-creation.php b/public/site/config/routes/request-project-creation.php
index 9a474d7..1b9b378 100644
--- a/public/site/config/routes/request-project-creation.php
+++ b/public/site/config/routes/request-project-creation.php
@@ -11,15 +11,24 @@ return [
 
     $client = kirby()->user()->client()->toPage()->uuid();
 
+    $date = new DateTime();
+    $formattedDate = $date->format(DateTime::ISO8601);
+
     $projectData = [
       "slug" => esc(Str::slug($data->title)),
-      "template" => "project", 
+      "template" => "project",
       "content" => [
         "title" => esc($data->title),
-        "requestDetails" => esc("Demande de " . kirby()->user()->name() . " (" . kirby()->user()->email() . ") : \n\n" . $data->details),
+        "requestDetails" => esc("Demande de " . $user->name() . " (" . $user->email() . ") : \n\n" . $data->details),
         "client" => [$client],
         "isClientRequest" => "true",
-        "isDTLEnabled" => esc($data->isDTLEnabled)
+        "isDTLEnabled" => esc($data->isDTLEnabled),
+        // Métadonnées pour le système de notifications dérivées
+        "requestAuthor" => (string) $user->uuid(),
+        "requestAuthorName" => (string) $user->name(),
+        "requestAuthorEmail" => (string) $user->email(),
+        "requestDate" => $formattedDate,
+        "requestReadby" => [],
       ]
     ];
 
@@ -27,21 +36,8 @@ return [
     try {
       $newProject = $projects->createChild($projectData);
 
-      $date = new DateTime();
-      $formattedDate = $date->format(DateTime::ISO8601);
-
-      $notificationData = [
-        "location" => [
-          "page" => $newProject
-        ],
-        "date" => (string) $formattedDate,
-        "text" => nl2br(esc($data->details)),
-        "author" => $user,
-        "id" => Str::uuid(),
-        "type" => "project-request",
-      ];
-
-      $newProject->createNotification($notificationData);
+      // Note: Les notifications sont maintenant dérivées.
+      // Plus besoin d'appeler createNotification().
 
       return [
         "status" => "success",
diff --git a/public/site/config/routes/validate-brief.php b/public/site/config/routes/validate-brief.php
index f8e97f1..fb2bf86 100644
--- a/public/site/config/routes/validate-brief.php
+++ b/public/site/config/routes/validate-brief.php
@@ -9,27 +9,24 @@ return [
 
     $page = page($data->briefUri);
     $project = $page->parent();
-    
-    try {
-      $newPage = $page->update([
-        'isValidated' => 'true'
-      ]);
+    $user = kirby()->user();
 
+    try {
       $timezone = new DateTimeZone('Europe/Paris');
       $dateTime = new DateTime('now', $timezone);
 
-      $notification = [
-        'location' => [
-          'page' => $page,
-        ],
-        'date' => $dateTime->format('Y-m-d\TH:i:sP'),
-        'text' => "Nouveau brief", 
-        'author' => kirby()->user(),
-        'id' => Str::uuid(),
-        'type' => 'content'
-      ];
+      $newPage = $page->update([
+        'isValidated' => 'true',
+        // Métadonnées pour le système de notifications dérivées
+        'validatedBy' => (string) $user->uuid(),
+        'validatedByName' => (string) $user->name(),
+        'validatedByEmail' => (string) $user->email(),
+        'validatedAt' => $dateTime->format('Y-m-d\TH:i:sP'),
+        'validationReadby' => [],
+      ]);
 
-      $project->createNotification($notification);
+      // Note: Les notifications sont maintenant dérivées.
+      // Plus besoin d'appeler createNotification().
 
       return [
         "success" => "'" . $project->title()->value() . "' brief validated."
diff --git a/public/site/plugins/comments/routes/create.php b/public/site/plugins/comments/routes/create.php
index 9db31cf..5641383 100644
--- a/public/site/plugins/comments/routes/create.php
+++ b/public/site/plugins/comments/routes/create.php
@@ -46,6 +46,7 @@ return [
         'author' => kirby()->user(),
         'id'     => Str::uuid(),
         'type'   => 'comment',
+        'readby' => [], // Pour le système de notifications dérivées
       ];
 
       if (isset($data->position->pageIndex)) {
@@ -62,11 +63,8 @@ return [
 
       echo json_encode(getFileData($newFile));
 
-      try {
-          $project->createNotification($commentData);
-      } catch (\Throwable $th) {
-          throw new Exception($th->getMessage() . '. line ' . $th->getLine() . ' in file ' . $th->getFile(), 1);
-      }
+      // Note: Les notifications sont maintenant dérivées des commentaires.
+      // Plus besoin d'appeler createNotification().
 
       exit;
   },
diff --git a/public/site/plugins/comments/routes/delete.php b/public/site/plugins/comments/routes/delete.php
index 8bc9e07..5f96a96 100644
--- a/public/site/plugins/comments/routes/delete.php
+++ b/public/site/plugins/comments/routes/delete.php
@@ -39,8 +39,8 @@ return [
 
       echo json_encode(getFileData($newFile));
 
-      $project = $page->parents()->findBy('template', 'project');
-      $project->deleteNotification($data->id);
+      // Note: Les notifications sont maintenant dérivées des commentaires.
+      // La suppression du commentaire supprime automatiquement la notification.
 
       exit;
   },
diff --git a/public/site/plugins/comments/routes/reply.php b/public/site/plugins/comments/routes/reply.php
index 68aeebd..2418dfe 100644
--- a/public/site/plugins/comments/routes/reply.php
+++ b/public/site/plugins/comments/routes/reply.php
@@ -31,18 +31,19 @@ return [
               "author" => kirby()->user(),
               "id" => Str::uuid(),
               "type" => "comment-reply",
+              "readby" => [], // Pour le système de notifications dérivées
             ];
             $newReply = new Reply($replyData);
             $comment['replies'][] = $newReply->toArray();
         }
       }
-      
+
       $newFile = $file->update([
         'comments' => $comments
       ]);
 
-      $project = $page->parents()->findBy("template", "project");
-      $project->createNotification($replyData);
+      // Note: Les notifications sont maintenant dérivées des commentaires.
+      // Plus besoin d'appeler createNotification().
 
       return getFileData($newFile);
   }
diff --git a/public/site/plugins/notifications/index.php b/public/site/plugins/notifications/index.php
index 91da6f9..9b46c7e 100644
--- a/public/site/plugins/notifications/index.php
+++ b/public/site/plugins/notifications/index.php
@@ -1,27 +1,54 @@
 <?php
 
-load([
-  "ProjectPage" => "models/ProjectPage.php",
-], __DIR__);
+use adrienpayet\notifications\NotificationCollector;
+use adrienpayet\notifications\providers\CommentProvider;
+use adrienpayet\notifications\providers\ReplyProvider;
+use adrienpayet\notifications\providers\ProjectRequestProvider;
+use adrienpayet\notifications\providers\AppointmentRequestProvider;
+use adrienpayet\notifications\providers\ContentProvider;
 
+// Charger les classes
 F::loadClasses([
-  // Own classes
-  "adrienpayet\\notifications\\Notification" => __DIR__ . "/src/Notification.php",
-  "adrienpayet\\notifications\\NotificationsPage" => __DIR__ . "/src/NotificationsPage.php",
-  
-  // Shared classes
-  "adrienpayet\\D2P\\data\\Position" => __DIR__ . "/../classes/Position.php",
-  "adrienpayet\\D2P\data\Author" => __DIR__ . "/../classes/Author.php",
-  "adrienpayet\\D2P\\data\\location\\Location" => __DIR__ . "/../classes/location/Location.php",
-  "adrienpayet\\D2P\\data\\location\\PageDetails" => __DIR__ . "/../classes/location/PageDetails.php",
-  "adrienpayet\\D2P\\data\\location\\ProjectDetails" => __DIR__ . "/../classes/location/ProjectDetails.php",
-  "adrienpayet\\D2P\\data\\location\\FileDetails" => __DIR__ . "/../classes/location/FileDetails.php",
+    // Nouvelles classes - Système de providers
+    "adrienpayet\\notifications\\NotificationProvider" => __DIR__ . "/src/NotificationProvider.php",
+    "adrienpayet\\notifications\\NotificationCollector" => __DIR__ . "/src/NotificationCollector.php",
+    "adrienpayet\\notifications\\providers\\CommentProvider" => __DIR__ . "/src/providers/CommentProvider.php",
+    "adrienpayet\\notifications\\providers\\ReplyProvider" => __DIR__ . "/src/providers/ReplyProvider.php",
+    "adrienpayet\\notifications\\providers\\ProjectRequestProvider" => __DIR__ . "/src/providers/ProjectRequestProvider.php",
+    "adrienpayet\\notifications\\providers\\AppointmentRequestProvider" => __DIR__ . "/src/providers/AppointmentRequestProvider.php",
+    "adrienpayet\\notifications\\providers\\ContentProvider" => __DIR__ . "/src/providers/ContentProvider.php",
+
+    // Anciennes classes - Gardées pour rétro-compatibilité pendant migration
+    "adrienpayet\\notifications\\Notification" => __DIR__ . "/src/Notification.php",
+    "adrienpayet\\notifications\\NotificationsPage" => __DIR__ . "/src/NotificationsPage.php",
+
+    // Classes partagées
+    "adrienpayet\\D2P\\data\\Position" => __DIR__ . "/../classes/Position.php",
+    "adrienpayet\\D2P\\data\\Author" => __DIR__ . "/../classes/Author.php",
+    "adrienpayet\\D2P\\data\\location\\Location" => __DIR__ . "/../classes/location/Location.php",
+    "adrienpayet\\D2P\\data\\location\\PageDetails" => __DIR__ . "/../classes/location/PageDetails.php",
+    "adrienpayet\\D2P\\data\\location\\ProjectDetails" => __DIR__ . "/../classes/location/ProjectDetails.php",
+    "adrienpayet\\D2P\\data\\location\\FileDetails" => __DIR__ . "/../classes/location/FileDetails.php",
 ]);
 
+// Créer et configurer le collector
+$collector = new NotificationCollector();
+$collector->register(new CommentProvider());
+$collector->register(new ReplyProvider());
+$collector->register(new ProjectRequestProvider());
+$collector->register(new AppointmentRequestProvider());
+$collector->register(new ContentProvider());
 
 Kirby::plugin("adrienpayet/pdc-notifications", [
-  "routes" => [
-    require(__DIR__ . "/routes/readAll.php"),
-    require(__DIR__ . "/routes/read.php")
-  ],
+    "options" => [
+        "collector" => $collector
+    ],
+    "routes" => [
+        // Nouvelles routes
+        require(__DIR__ . "/routes/mark-as-read.php"),
+        require(__DIR__ . "/routes/mark-all-read.php"),
+        // Anciennes routes - Gardées pour rétro-compatibilité
+        require(__DIR__ . "/routes/readAll.php"),
+        require(__DIR__ . "/routes/read.php"),
+    ],
 ]);
diff --git a/public/site/plugins/notifications/routes/mark-all-read.php b/public/site/plugins/notifications/routes/mark-all-read.php
new file mode 100644
index 0000000..c06cc80
--- /dev/null
+++ b/public/site/plugins/notifications/routes/mark-all-read.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * Route pour marquer toutes les notifications comme lues.
+ * Parcourt tous les projets accessibles à l'utilisateur.
+ */
+return [
+    'pattern' => '(:all)mark-all-notifications-read.json',
+    'method' => 'POST',
+    'action' => function () {
+        try {
+            $user = kirby()->user();
+            if (!$user) {
+                throw new Exception('User not authenticated');
+            }
+
+            $collector = kirby()->option('adrienpayet.pdc-notifications.collector');
+            if (!$collector) {
+                throw new Exception('NotificationCollector not initialized');
+            }
+
+            // Récupérer les projets selon le rôle
+            if ($user->role()->name() === 'admin') {
+                $projects = page('projects')->children()->toArray();
+            } else {
+                $projects = $user->projects()->toPages()->toArray();
+            }
+
+            $count = $collector->markAllAsRead($projects, $user);
+
+            return json_encode([
+                'status' => 'success',
+                'message' => "$count notifications marked as read"
+            ]);
+        } catch (\Throwable $th) {
+            return json_encode([
+                'status' => 'error',
+                'message' => $th->getMessage()
+            ]);
+        }
+    }
+];
diff --git a/public/site/plugins/notifications/routes/mark-as-read.php b/public/site/plugins/notifications/routes/mark-as-read.php
new file mode 100644
index 0000000..736b39f
--- /dev/null
+++ b/public/site/plugins/notifications/routes/mark-as-read.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Route pour marquer une notification comme lue.
+ * Délègue au bon provider selon le type de notification.
+ */
+return [
+    'pattern' => '(:all)mark-notification-read.json',
+    'method' => 'POST',
+    'action' => function () {
+        $json = file_get_contents('php://input');
+        $data = json_decode($json);
+
+        if (!$data || !isset($data->type) || !isset($data->id)) {
+            return json_encode([
+                'status' => 'error',
+                'message' => 'Missing required fields: type, id'
+            ]);
+        }
+
+        try {
+            $collector = kirby()->option('adrienpayet.pdc-notifications.collector');
+
+            if (!$collector) {
+                throw new Exception('NotificationCollector not initialized');
+            }
+
+            $success = $collector->markAsRead(
+                $data->type,
+                $data->id,
+                (array) $data,
+                kirby()->user()
+            );
+
+            return json_encode([
+                'status' => $success ? 'success' : 'error',
+                'message' => $success ? 'Notification marked as read' : 'Failed to mark notification as read'
+            ]);
+        } catch (\Throwable $th) {
+            return json_encode([
+                'status' => 'error',
+                'message' => $th->getMessage()
+            ]);
+        }
+    }
+];
diff --git a/public/site/plugins/notifications/src/NotificationCollector.php b/public/site/plugins/notifications/src/NotificationCollector.php
new file mode 100644
index 0000000..113b041
--- /dev/null
+++ b/public/site/plugins/notifications/src/NotificationCollector.php
@@ -0,0 +1,123 @@
+<?php
+
+namespace adrienpayet\notifications;
+
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+
+/**
+ * Collecteur de notifications qui agrège tous les providers.
+ *
+ * Permet de :
+ * - Enregistrer des providers de notifications
+ * - Collecter toutes les notifications de tous les providers
+ * - Déléguer le markAsRead au bon provider
+ */
+class NotificationCollector
+{
+    /** @var NotificationProvider[] */
+    private array $providers = [];
+
+    /**
+     * Enregistre un nouveau provider.
+     */
+    public function register(NotificationProvider $provider): void
+    {
+        $this->providers[$provider->getType()] = $provider;
+    }
+
+    /**
+     * Collecte toutes les notifications de tous les providers pour un projet.
+     *
+     * @param Page $project Le projet à scanner
+     * @param User $user L'utilisateur courant
+     * @return array Liste triée par date décroissante
+     */
+    public function collect(Page $project, User $user): array
+    {
+        $all = [];
+
+        foreach ($this->providers as $provider) {
+            try {
+                $notifications = $provider->collect($project, $user);
+                $all = array_merge($all, $notifications);
+            } catch (\Throwable $e) {
+                // Log l'erreur mais continue avec les autres providers
+                error_log("NotificationCollector: Error in {$provider->getType()}: " . $e->getMessage());
+            }
+        }
+
+        // Trier par date décroissante
+        usort($all, function ($a, $b) {
+            $dateA = strtotime($a['date'] ?? '0');
+            $dateB = strtotime($b['date'] ?? '0');
+            return $dateB - $dateA;
+        });
+
+        return $all;
+    }
+
+    /**
+     * Marque une notification comme lue en déléguant au bon provider.
+     *
+     * @param string $type Le type de notification
+     * @param string $id L'identifiant de la notification
+     * @param array $location Informations de localisation
+     * @param User $user L'utilisateur qui marque comme lu
+     * @return bool True si succès
+     */
+    public function markAsRead(string $type, string $id, array $location, User $user): bool
+    {
+        if (!isset($this->providers[$type])) {
+            error_log("NotificationCollector: Unknown notification type: $type");
+            return false;
+        }
+
+        try {
+            return $this->providers[$type]->markAsRead($id, $location, $user);
+        } catch (\Throwable $e) {
+            error_log("NotificationCollector: Error marking as read: " . $e->getMessage());
+            return false;
+        }
+    }
+
+    /**
+     * Marque toutes les notifications comme lues pour un utilisateur.
+     *
+     * @param Page[] $projects Liste des projets
+     * @param User $user L'utilisateur
+     * @return int Nombre de notifications marquées comme lues
+     */
+    public function markAllAsRead(array $projects, User $user): int
+    {
+        $count = 0;
+
+        foreach ($projects as $project) {
+            $notifications = $this->collect($project, $user);
+
+            foreach ($notifications as $notification) {
+                if (!($notification['isRead'] ?? false)) {
+                    $success = $this->markAsRead(
+                        $notification['type'],
+                        $notification['id'],
+                        $notification,
+                        $user
+                    );
+                    if ($success) {
+                        $count++;
+                    }
+                }
+            }
+        }
+
+        return $count;
+    }
+
+    /**
+     * Retourne la liste des types de notifications enregistrés.
+     */
+    public function getRegisteredTypes(): array
+    {
+        return array_keys($this->providers);
+    }
+}
diff --git a/public/site/plugins/notifications/src/NotificationProvider.php b/public/site/plugins/notifications/src/NotificationProvider.php
new file mode 100644
index 0000000..cc11906
--- /dev/null
+++ b/public/site/plugins/notifications/src/NotificationProvider.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace adrienpayet\notifications;
+
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+
+/**
+ * Interface pour les providers de notifications.
+ *
+ * Chaque type de notification (comment, project-request, etc.)
+ * a son propre provider qui sait :
+ * - Collecter les notifications depuis la source de données
+ * - Marquer une notification comme lue sur la source
+ */
+interface NotificationProvider
+{
+    /**
+     * Retourne le type de notification géré par ce provider.
+     * Ex: 'comment', 'comment-reply', 'project-request'
+     */
+    public function getType(): string;
+
+    /**
+     * Collecte toutes les notifications de ce type pour un projet et un utilisateur.
+     *
+     * @param Page $project Le projet à scanner
+     * @param User $user L'utilisateur courant (pour filtrer ses propres actions)
+     * @return array Liste des notifications au format standard
+     */
+    public function collect(Page $project, User $user): array;
+
+    /**
+     * Marque une notification comme lue.
+     *
+     * @param string $id L'identifiant de la notification
+     * @param array $location Informations de localisation (ex: _file, _projectUri)
+     * @param User $user L'utilisateur qui marque comme lu
+     * @return bool True si succès, false sinon
+     */
+    public function markAsRead(string $id, array $location, User $user): bool;
+}
diff --git a/public/site/plugins/notifications/src/providers/AppointmentRequestProvider.php b/public/site/plugins/notifications/src/providers/AppointmentRequestProvider.php
new file mode 100644
index 0000000..8a8eb4d
--- /dev/null
+++ b/public/site/plugins/notifications/src/providers/AppointmentRequestProvider.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace adrienpayet\notifications\providers;
+
+use adrienpayet\notifications\NotificationProvider;
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+use Kirby\Data\Yaml;
+
+/**
+ * Provider pour les notifications de type "appointment-request".
+ * Dérivé depuis les champs du projet quand hasOptimizationRequest est true.
+ */
+class AppointmentRequestProvider implements NotificationProvider
+{
+    public function getType(): string
+    {
+        return 'appointment-request';
+    }
+
+    public function collect(Page $project, User $user): array
+    {
+        // Pas de notification si pas de demande d'optimisation
+        if ($project->hasOptimizationRequest()->isFalse()) {
+            return [];
+        }
+
+        // Vérifier que les champs requis existent
+        if ($project->optimizationAuthor()->isEmpty()) {
+            return [];
+        }
+
+        $userUuid = (string) $user->uuid();
+        $authorUuid = $project->optimizationAuthor()->value();
+
+        // Ne pas notifier l'auteur de sa propre demande
+        if ($authorUuid === $userUuid) {
+            return [];
+        }
+
+        $readby = $project->optimizationReadby()->isNotEmpty()
+            ? Yaml::decode($project->optimizationReadby()->value())
+            : [];
+
+        if (!is_array($readby)) {
+            $readby = [];
+        }
+
+        return [[
+            'id' => 'appointment-request-' . (string) $project->uuid(),
+            'type' => 'appointment-request',
+            'text' => $project->optimizationRequestDetails()->value() ?? '',
+            'author' => [
+                'uuid' => $authorUuid,
+                'name' => $project->optimizationAuthorName()->value() ?? '',
+                'email' => $project->optimizationAuthorEmail()->value() ?? '',
+                'role' => 'client',
+            ],
+            'date' => $project->optimizationDate()->value() ?? '',
+            'location' => [
+                'page' => [
+                    'uri' => $project->uri(),
+                    'title' => (string) $project->title(),
+                    'template' => 'project',
+                ],
+                'project' => [
+                    'uri' => $project->uri(),
+                    'title' => (string) $project->title(),
+                ]
+            ],
+            'readby' => $readby,
+            'isRead' => in_array($userUuid, $readby),
+            '_projectUri' => $project->uri(),
+        ]];
+    }
+
+    public function markAsRead(string $id, array $location, User $user): bool
+    {
+        $projectUri = $location['_projectUri'] ?? null;
+        if (!$projectUri) {
+            return false;
+        }
+
+        $project = page($projectUri);
+        if (!$project) {
+            return false;
+        }
+
+        $readby = $project->optimizationReadby()->isNotEmpty()
+            ? Yaml::decode($project->optimizationReadby()->value())
+            : [];
+
+        if (!is_array($readby)) {
+            $readby = [];
+        }
+
+        $userUuid = (string) $user->uuid();
+
+        if (in_array($userUuid, $readby)) {
+            return true;
+        }
+
+        $readby[] = $userUuid;
+
+        $project->update([
+            'optimizationReadby' => array_unique($readby)
+        ]);
+
+        return true;
+    }
+}
diff --git a/public/site/plugins/notifications/src/providers/CommentProvider.php b/public/site/plugins/notifications/src/providers/CommentProvider.php
new file mode 100644
index 0000000..fc92ce1
--- /dev/null
+++ b/public/site/plugins/notifications/src/providers/CommentProvider.php
@@ -0,0 +1,172 @@
+<?php
+
+namespace adrienpayet\notifications\providers;
+
+use adrienpayet\notifications\NotificationProvider;
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+use Kirby\Data\Yaml;
+
+/**
+ * Provider pour les notifications de type "comment".
+ * Collecte les commentaires depuis les fichiers des étapes du projet.
+ */
+class CommentProvider implements NotificationProvider
+{
+    public function getType(): string
+    {
+        return 'comment';
+    }
+
+    public function collect(Page $project, User $user): array
+    {
+        $notifications = [];
+        $userUuid = (string) $user->uuid();
+
+        // Parcourir toutes les étapes du projet
+        foreach ($project->children() as $step) {
+            // Parcourir tous les fichiers de chaque étape
+            foreach ($step->files() as $file) {
+                if ($file->comments()->isEmpty()) {
+                    continue;
+                }
+
+                $comments = Yaml::decode($file->comments()->value());
+                if (!is_array($comments)) {
+                    continue;
+                }
+
+                foreach ($comments as $comment) {
+                    // Ignorer les commentaires de type reply (gérés par ReplyProvider)
+                    if (($comment['type'] ?? 'comment') === 'comment-reply') {
+                        continue;
+                    }
+
+                    // Ne pas notifier l'auteur de son propre commentaire
+                    $authorUuid = $comment['author']['uuid'] ?? '';
+                    if ($authorUuid === $userUuid) {
+                        continue;
+                    }
+
+                    $readby = $comment['readby'] ?? [];
+
+                    $location = $comment['location'] ?? [];
+                    // Assurer que location.project existe toujours
+                    if (!isset($location['project'])) {
+                        $location['project'] = [
+                            'uri' => $project->uri(),
+                            'title' => (string) $project->title(),
+                        ];
+                    }
+
+                    $notifications[] = [
+                        'id' => $comment['id'],
+                        'type' => 'comment',
+                        'text' => $comment['text'] ?? '',
+                        'author' => $comment['author'] ?? [],
+                        'date' => $comment['date'] ?? '',
+                        'location' => $location,
+                        'position' => $comment['position'] ?? [],
+                        'readby' => $readby,
+                        'isRead' => in_array($userUuid, $readby),
+                        // Métadonnées pour markAsRead
+                        '_file' => (string) $file->uuid(),
+                        '_stepUri' => $step->uri(),
+                    ];
+                }
+            }
+
+            // Parcourir aussi les sous-pages (ex: tracks dans virtual-sample)
+            foreach ($step->children() as $subPage) {
+                foreach ($subPage->files() as $file) {
+                    if ($file->comments()->isEmpty()) {
+                        continue;
+                    }
+
+                    $comments = Yaml::decode($file->comments()->value());
+                    if (!is_array($comments)) {
+                        continue;
+                    }
+
+                    foreach ($comments as $comment) {
+                        if (($comment['type'] ?? 'comment') === 'comment-reply') {
+                            continue;
+                        }
+
+                        $authorUuid = $comment['author']['uuid'] ?? '';
+                        if ($authorUuid === $userUuid) {
+                            continue;
+                        }
+
+                        $readby = $comment['readby'] ?? [];
+
+                        $location = $comment['location'] ?? [];
+                        // Assurer que location.project existe toujours
+                        if (!isset($location['project'])) {
+                            $location['project'] = [
+                                'uri' => $project->uri(),
+                                'title' => (string) $project->title(),
+                            ];
+                        }
+
+                        $notifications[] = [
+                            'id' => $comment['id'],
+                            'type' => 'comment',
+                            'text' => $comment['text'] ?? '',
+                            'author' => $comment['author'] ?? [],
+                            'date' => $comment['date'] ?? '',
+                            'location' => $location,
+                            'position' => $comment['position'] ?? [],
+                            'readby' => $readby,
+                            'isRead' => in_array($userUuid, $readby),
+                            '_file' => (string) $file->uuid(),
+                            '_stepUri' => $subPage->uri(),
+                        ];
+                    }
+                }
+            }
+        }
+
+        return $notifications;
+    }
+
+    public function markAsRead(string $id, array $location, User $user): bool
+    {
+        $fileUuid = $location['_file'] ?? null;
+        if (!$fileUuid) {
+            return false;
+        }
+
+        // Trouver le fichier par UUID (peut être avec ou sans préfixe file://)
+        $fileUri = str_starts_with($fileUuid, 'file://') ? $fileUuid : 'file://' . $fileUuid;
+        $file = kirby()->file($fileUri);
+        if (!$file) {
+            return false;
+        }
+
+        $comments = Yaml::decode($file->comments()->value());
+        if (!is_array($comments)) {
+            return false;
+        }
+
+        $userUuid = (string) $user->uuid();
+        $updated = false;
+
+        foreach ($comments as &$comment) {
+            if ($comment['id'] === $id) {
+                $comment['readby'] = $comment['readby'] ?? [];
+                if (!in_array($userUuid, $comment['readby'])) {
+                    $comment['readby'][] = $userUuid;
+                    $updated = true;
+                }
+                break;
+            }
+        }
+
+        if ($updated) {
+            $file->update(['comments' => $comments]);
+        }
+
+        return $updated;
+    }
+}
diff --git a/public/site/plugins/notifications/src/providers/ContentProvider.php b/public/site/plugins/notifications/src/providers/ContentProvider.php
new file mode 100644
index 0000000..3f09800
--- /dev/null
+++ b/public/site/plugins/notifications/src/providers/ContentProvider.php
@@ -0,0 +1,128 @@
+<?php
+
+namespace adrienpayet\notifications\providers;
+
+use adrienpayet\notifications\NotificationProvider;
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+use Kirby\Data\Yaml;
+
+/**
+ * Provider pour les notifications de type "content".
+ * Dérivé depuis les briefs validés (isValidated = true).
+ */
+class ContentProvider implements NotificationProvider
+{
+    public function getType(): string
+    {
+        return 'content';
+    }
+
+    public function collect(Page $project, User $user): array
+    {
+        $notifications = [];
+        $userUuid = (string) $user->uuid();
+
+        // Chercher les briefs validés (client-brief et extended-brief)
+        $briefTemplates = ['client-brief', 'extended-brief'];
+
+        foreach ($project->children() as $step) {
+            if (!in_array($step->intendedTemplate()->name(), $briefTemplates)) {
+                continue;
+            }
+
+            // Pas de notification si le brief n'est pas validé
+            if ($step->isValidated()->isFalse()) {
+                continue;
+            }
+
+            // Vérifier que les champs requis existent
+            if ($step->validatedBy()->isEmpty()) {
+                continue;
+            }
+
+            $authorUuid = $step->validatedBy()->value();
+
+            // Ne pas notifier l'auteur de sa propre validation
+            if ($authorUuid === $userUuid) {
+                continue;
+            }
+
+            $readby = $step->validationReadby()->isNotEmpty()
+                ? Yaml::decode($step->validationReadby()->value())
+                : [];
+
+            if (!is_array($readby)) {
+                $readby = [];
+            }
+
+            $stepLabel = $step->intendedTemplate()->name() === 'client-brief'
+                ? 'Brief client'
+                : 'Brief étendu';
+
+            $notifications[] = [
+                'id' => 'content-' . (string) $step->uuid(),
+                'type' => 'content',
+                'text' => "Nouveau $stepLabel validé",
+                'author' => [
+                    'uuid' => $authorUuid,
+                    'name' => $step->validatedByName()->value() ?? '',
+                    'email' => $step->validatedByEmail()->value() ?? '',
+                    'role' => 'client',
+                ],
+                'date' => $step->validatedAt()->value() ?? '',
+                'location' => [
+                    'page' => [
+                        'uri' => $step->uri(),
+                        'title' => (string) $step->title(),
+                        'template' => $step->intendedTemplate()->name(),
+                    ],
+                    'project' => [
+                        'uri' => $project->uri(),
+                        'title' => (string) $project->title(),
+                    ]
+                ],
+                'readby' => $readby,
+                'isRead' => in_array($userUuid, $readby),
+                '_briefUri' => $step->uri(),
+            ];
+        }
+
+        return $notifications;
+    }
+
+    public function markAsRead(string $id, array $location, User $user): bool
+    {
+        $briefUri = $location['_briefUri'] ?? null;
+        if (!$briefUri) {
+            return false;
+        }
+
+        $brief = page($briefUri);
+        if (!$brief) {
+            return false;
+        }
+
+        $readby = $brief->validationReadby()->isNotEmpty()
+            ? Yaml::decode($brief->validationReadby()->value())
+            : [];
+
+        if (!is_array($readby)) {
+            $readby = [];
+        }
+
+        $userUuid = (string) $user->uuid();
+
+        if (in_array($userUuid, $readby)) {
+            return true;
+        }
+
+        $readby[] = $userUuid;
+
+        $brief->update([
+            'validationReadby' => array_unique($readby)
+        ]);
+
+        return true;
+    }
+}
diff --git a/public/site/plugins/notifications/src/providers/ProjectRequestProvider.php b/public/site/plugins/notifications/src/providers/ProjectRequestProvider.php
new file mode 100644
index 0000000..cc3d186
--- /dev/null
+++ b/public/site/plugins/notifications/src/providers/ProjectRequestProvider.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace adrienpayet\notifications\providers;
+
+use adrienpayet\notifications\NotificationProvider;
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+use Kirby\Data\Yaml;
+
+/**
+ * Provider pour les notifications de type "project-request".
+ * Dérivé depuis les champs du projet quand isClientRequest est true.
+ */
+class ProjectRequestProvider implements NotificationProvider
+{
+    public function getType(): string
+    {
+        return 'project-request';
+    }
+
+    public function collect(Page $project, User $user): array
+    {
+        // Pas de notification si ce n'est pas une demande client
+        if ($project->isClientRequest()->isFalse()) {
+            return [];
+        }
+
+        // Vérifier que les champs requis existent
+        if ($project->requestAuthor()->isEmpty()) {
+            return [];
+        }
+
+        $userUuid = (string) $user->uuid();
+        $authorUuid = $project->requestAuthor()->value();
+
+        // Ne pas notifier l'auteur de sa propre demande
+        if ($authorUuid === $userUuid) {
+            return [];
+        }
+
+        $readby = $project->requestReadby()->isNotEmpty()
+            ? Yaml::decode($project->requestReadby()->value())
+            : [];
+
+        if (!is_array($readby)) {
+            $readby = [];
+        }
+
+        return [[
+            'id' => 'project-request-' . (string) $project->uuid(),
+            'type' => 'project-request',
+            'text' => $project->requestDetails()->value() ?? '',
+            'author' => [
+                'uuid' => $authorUuid,
+                'name' => $project->requestAuthorName()->value() ?? '',
+                'email' => $project->requestAuthorEmail()->value() ?? '',
+                'role' => 'client',
+            ],
+            'date' => $project->requestDate()->value() ?? '',
+            'location' => [
+                'page' => [
+                    'uri' => $project->uri(),
+                    'title' => (string) $project->title(),
+                    'template' => 'project',
+                ],
+                'project' => [
+                    'uri' => $project->uri(),
+                    'title' => (string) $project->title(),
+                ]
+            ],
+            'readby' => $readby,
+            'isRead' => in_array($userUuid, $readby),
+            '_projectUri' => $project->uri(),
+        ]];
+    }
+
+    public function markAsRead(string $id, array $location, User $user): bool
+    {
+        $projectUri = $location['_projectUri'] ?? null;
+        if (!$projectUri) {
+            return false;
+        }
+
+        $project = page($projectUri);
+        if (!$project) {
+            return false;
+        }
+
+        $readby = $project->requestReadby()->isNotEmpty()
+            ? Yaml::decode($project->requestReadby()->value())
+            : [];
+
+        if (!is_array($readby)) {
+            $readby = [];
+        }
+
+        $userUuid = (string) $user->uuid();
+
+        if (in_array($userUuid, $readby)) {
+            return true; // Déjà lu
+        }
+
+        $readby[] = $userUuid;
+
+        $project->update([
+            'requestReadby' => array_unique($readby)
+        ]);
+
+        return true;
+    }
+}
diff --git a/public/site/plugins/notifications/src/providers/ReplyProvider.php b/public/site/plugins/notifications/src/providers/ReplyProvider.php
new file mode 100644
index 0000000..467b245
--- /dev/null
+++ b/public/site/plugins/notifications/src/providers/ReplyProvider.php
@@ -0,0 +1,142 @@
+<?php
+
+namespace adrienpayet\notifications\providers;
+
+use adrienpayet\notifications\NotificationProvider;
+use Kirby\Cms\Page;
+use Kirby\Cms\User;
+use Kirby\Data\Yaml;
+
+/**
+ * Provider pour les notifications de type "comment-reply".
+ * Collecte les réponses aux commentaires depuis les fichiers.
+ */
+class ReplyProvider implements NotificationProvider
+{
+    public function getType(): string
+    {
+        return 'comment-reply';
+    }
+
+    public function collect(Page $project, User $user): array
+    {
+        $notifications = [];
+        $userUuid = (string) $user->uuid();
+
+        // Parcourir toutes les étapes du projet
+        foreach ($project->children() as $step) {
+            $this->collectFromPage($step, $project, $userUuid, $notifications);
+
+            // Parcourir aussi les sous-pages (ex: tracks)
+            foreach ($step->children() as $subPage) {
+                $this->collectFromPage($subPage, $project, $userUuid, $notifications);
+            }
+        }
+
+        return $notifications;
+    }
+
+    private function collectFromPage(Page $page, Page $project, string $userUuid, array &$notifications): void
+    {
+        foreach ($page->files() as $file) {
+            if ($file->comments()->isEmpty()) {
+                continue;
+            }
+
+            $comments = Yaml::decode($file->comments()->value());
+            if (!is_array($comments)) {
+                continue;
+            }
+
+            foreach ($comments as $comment) {
+                $replies = $comment['replies'] ?? [];
+
+                foreach ($replies as $reply) {
+                    // Ne pas notifier l'auteur de sa propre réponse
+                    $authorUuid = $reply['author']['uuid'] ?? '';
+                    if ($authorUuid === $userUuid) {
+                        continue;
+                    }
+
+                    $readby = $reply['readby'] ?? [];
+
+                    $location = $reply['location'] ?? $comment['location'] ?? [];
+                    // Assurer que location.project existe toujours
+                    if (!isset($location['project'])) {
+                        $location['project'] = [
+                            'uri' => $project->uri(),
+                            'title' => (string) $project->title(),
+                        ];
+                    }
+
+                    $notifications[] = [
+                        'id' => $reply['id'],
+                        'type' => 'comment-reply',
+                        'text' => $reply['text'] ?? '',
+                        'author' => $reply['author'] ?? [],
+                        'date' => $reply['date'] ?? '',
+                        'location' => $location,
+                        'position' => $reply['position'] ?? $comment['position'] ?? [],
+                        'readby' => $readby,
+                        'isRead' => in_array($userUuid, $readby),
+                        // Métadonnées pour markAsRead
+                        '_file' => (string) $file->uuid(),
+                        '_parentCommentId' => $comment['id'],
+                        '_stepUri' => $page->uri(),
+                    ];
+                }
+            }
+        }
+    }
+
+    public function markAsRead(string $id, array $location, User $user): bool
+    {
+        $fileUuid = $location['_file'] ?? null;
+        $parentCommentId = $location['_parentCommentId'] ?? null;
+
+        if (!$fileUuid) {
+            return false;
+        }
+
+        // Trouver le fichier par UUID (peut être avec ou sans préfixe file://)
+        $fileUri = str_starts_with($fileUuid, 'file://') ? $fileUuid : 'file://' . $fileUuid;
+        $file = kirby()->file($fileUri);
+        if (!$file) {
+            return false;
+        }
+
+        $comments = Yaml::decode($file->comments()->value());
+        if (!is_array($comments)) {
+            return false;
+        }
+
+        $userUuid = (string) $user->uuid();
+        $updated = false;
+
+        foreach ($comments as &$comment) {
+            // Si on a l'ID du parent, l'utiliser pour cibler
+            if ($parentCommentId && $comment['id'] !== $parentCommentId) {
+                continue;
+            }
+
+            $replies = &$comment['replies'] ?? [];
+
+            foreach ($replies as &$reply) {
+                if ($reply['id'] === $id) {
+                    $reply['readby'] = $reply['readby'] ?? [];
+                    if (!in_array($userUuid, $reply['readby'])) {
+                        $reply['readby'][] = $userUuid;
+                        $updated = true;
+                    }
+                    break 2;
+                }
+            }
+        }
+
+        if ($updated) {
+            $file->update(['comments' => $comments]);
+        }
+
+        return $updated;
+    }
+}
diff --git a/public/site/templates/projects.json.php b/public/site/templates/projects.json.php
index ba74b69..cf5a52a 100644
--- a/public/site/templates/projects.json.php
+++ b/public/site/templates/projects.json.php
@@ -7,24 +7,37 @@ if (!$kirby->user()) {
   ]);
 }
 
-function getProjectData($project)
-{  
+// Récupérer le collector de notifications
+$notificationCollector = $kirby->option('adrienpayet.pdc-notifications.collector');
+
+function getProjectData($project, $user, $collector)
+{
+    // Utiliser le nouveau système de notifications dérivées
+    $notifications = [];
+    if ($collector) {
+        try {
+            $notifications = $collector->collect($project, $user);
+        } catch (\Throwable $e) {
+            error_log("Error collecting notifications for project {$project->uri()}: " . $e->getMessage());
+            $notifications = [];
+        }
+    }
 
     $data = [
-    'title'                  => $project->title()->value(),
-    'url'                    => $project->url(),
-    'uri'                    => '/' . $project->uri(),
-    'modified'               => $project->modified('Y-MM-d'),
-    'currentStep'            => $project->currentStep()->value(),
-    'status'                 => $project->status(),
-    'logo'                   => $project->client()->toPage() ? $project->client()->toPage()->logo()->toFile()->url() : '',
-    'steps'                  => $project->getSteps(),
-    'notifications'          => Yaml::decode($project->notifications()->value),
-    'uuid'                   => (string) $project->uuid(),
-    'slug'                   => (string) $project->slug(),
-    'isDTLEnabled'           => $project->isDTLEnabled()->isTrue(),
-    'hasOptimizationRequest' => $project->hasOptimizationRequest()->isTrue(),
-  ];
+        'title'                  => $project->title()->value(),
+        'url'                    => $project->url(),
+        'uri'                    => '/' . $project->uri(),
+        'modified'               => $project->modified('Y-MM-d'),
+        'currentStep'            => $project->currentStep()->value(),
+        'status'                 => $project->status(),
+        'logo'                   => $project->client()->toPage() ? $project->client()->toPage()->logo()->toFile()->url() : '',
+        'steps'                  => $project->getSteps(),
+        'notifications'          => $notifications,
+        'uuid'                   => (string) $project->uuid(),
+        'slug'                   => (string) $project->slug(),
+        'isDTLEnabled'           => $project->isDTLEnabled()->isTrue(),
+        'hasOptimizationRequest' => $project->hasOptimizationRequest()->isTrue(),
+    ];
 
     if ($project->isDTLEnabled()) {
         $data['designToLight'] = processDTLProposals($project);
@@ -33,8 +46,12 @@ function getProjectData($project)
     return $data;
 }
 
+$currentUser = $kirby->user();
+
 try {
-    $children = $kirby->user()->role() == 'admin' ? $page->childrenAndDrafts()->map(fn($project) => getProjectData($project))->values() : $kirby->user()->projects()->toPages()->map(fn($project) => getProjectData($project))->values();
+    $children = $currentUser->role() == 'admin'
+        ? $page->childrenAndDrafts()->map(fn($project) => getProjectData($project, $currentUser, $notificationCollector))->values()
+        : $currentUser->projects()->toPages()->map(fn($project) => getProjectData($project, $currentUser, $notificationCollector))->values();
 } catch (\Throwable $th) {
     throw new Exception($th->getMessage() . ' line ' . $th->getLine() . ' in file ' . $th->getFile(), 1);
     $children = [];
diff --git a/src/stores/api.js b/src/stores/api.js
index d12707a..cbffdd8 100644
--- a/src/stores/api.js
+++ b/src/stores/api.js
@@ -163,6 +163,34 @@ export const useApiStore = defineStore("api", () => {
     }
   }
 
+  /**
+   * Marque une notification comme lue.
+   * @param {Object} notification - L'objet notification complet (avec type, id, _file, _projectUri, etc.)
+   */
+  async function markNotificationRead(notification) {
+    const headers = {
+      method: "POST",
+      body: JSON.stringify(notification),
+    };
+    try {
+      const response = await fetch("/mark-notification-read.json", headers);
+      if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`);
+      }
+      const data = await response.json();
+      if (data.status === "error") {
+        throw new Error(data.message);
+      }
+      // Mettre à jour le store local
+      userStore.markNotificationRead(notification.id, notification.project?.uri || notification._projectUri);
+      return data;
+    } catch (error) {
+      console.error("Erreur lors du marquage de la notification:", error);
+      throw error;
+    }
+  }
+
+  // Ancienne fonction gardée pour rétro-compatibilité
   async function readNotification(notificationId, projectId) {
     const headers = {
       method: "POST",
@@ -215,6 +243,31 @@ export const useApiStore = defineStore("api", () => {
     }
   }
 
+  /**
+   * Marque toutes les notifications comme lues (nouveau système).
+   */
+  async function markAllNotificationsRead() {
+    try {
+      const response = await fetch("/mark-all-notifications-read.json", {
+        method: "POST",
+      });
+      if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`);
+      }
+      const data = await response.json();
+      if (data.status === "error") {
+        throw new Error(data.message);
+      }
+      userStore.markAllNotificationsRead();
+      console.log("Toutes les notifications ont été marquées comme lues.");
+      return data;
+    } catch (error) {
+      console.error("Erreur lors du marquage de toutes les notifications:", error);
+      throw error;
+    }
+  }
+
+  // Ancienne fonction gardée pour rétro-compatibilité
   async function readAllNotifications() {
     try {
       const response = await fetch("/read-all-notifications.json");
@@ -243,6 +296,10 @@ export const useApiStore = defineStore("api", () => {
     updateComment,
     deleteComment,
     replyComment,
+    // Nouvelles fonctions
+    markNotificationRead,
+    markAllNotificationsRead,
+    // Anciennes fonctions (rétro-compatibilité)
     readNotification,
     readAllNotifications,
     validateBrief,
diff --git a/src/stores/user.js b/src/stores/user.js
index 7beaf69..b3404df 100644
--- a/src/stores/user.js
+++ b/src/stores/user.js
@@ -11,48 +11,76 @@ export const useUserStore = defineStore('user', () => {
 
   const { projects } = storeToRefs(useProjectsStore());
 
+  /**
+   * Liste des notifications agrégées depuis tous les projets.
+   * Les notifications sont maintenant dérivées côté backend avec isRead pré-calculé.
+   */
   const notifications = computed(() => {
-    return projects.value?.flatMap((project) => {
+    if (!projects.value || !user.value) return [];
+
+    return projects.value.flatMap((project) => {
       if (!project.notifications) return [];
 
-      return project.notifications
-        .filter((notification) => notification.author.uuid !== user.value.uuid)
-        .map((notification) => ({
-          ...notification,
-          project: project,
-          isRead: notification.readby?.includes(user.value.uuid),
-        }));
+      return project.notifications.map((notification) => ({
+        ...notification,
+        project: project,
+        // isRead est maintenant fourni par le backend
+      }));
     });
   });
 
-  function readNotification(notificationId, projectId) {
-    console.log('Read notification', notificationId, projectId);
+  /**
+   * Marque une notification comme lue dans le store local.
+   * @param {string} notificationId - L'ID de la notification
+   * @param {string} projectUri - L'URI du projet (optionnel, pour retrouver le projet)
+   */
+  function markNotificationRead(notificationId, projectUri = null) {
+    if (!user.value?.uuid) return;
+
+    projects.value = projects.value.map((project) => {
+      // Si projectUri fourni, cibler le bon projet
+      if (projectUri && project.uri !== projectUri && `/${project.uri}` !== projectUri) {
+        return project;
+      }
+
+      return {
+        ...project,
+        notifications: (project.notifications || []).map((notification) =>
+          notification.id === notificationId
+            ? {
+                ...notification,
+                isRead: true,
+                readby: [...new Set([...(notification.readby || []), user.value.uuid])],
+              }
+            : notification
+        ),
+      };
+    });
+  }
+
+  /**
+   * Marque toutes les notifications comme lues dans le store local.
+   */
+  function markAllNotificationsRead() {
+    if (!user.value?.uuid) return;
+
     projects.value = projects.value.map((project) => ({
       ...project,
-      notifications:
-        project.uuid === projectId || project.uri === projectId
-          ? project.notifications.map((notification) =>
-              notification.id === notificationId
-                ? {
-                    ...notification,
-                    readby: [
-                      ...new Set([...notification.readby, user.value.uuid]),
-                    ],
-                  }
-                : notification
-            )
-          : project.notifications,
+      notifications: (project.notifications || []).map((notification) => ({
+        ...notification,
+        isRead: true,
+        readby: [...new Set([...(notification.readby || []), user.value.uuid])],
+      })),
     }));
   }
 
+  // Anciennes fonctions gardées pour rétro-compatibilité
+  function readNotification(notificationId, projectId) {
+    markNotificationRead(notificationId, projectId);
+  }
+
   function readAllNotifications() {
-    projects.value = projects.value.map((project) => ({
-      ...project,
-      notifications: project.notifications.map((notification) => ({
-        ...notification,
-        readby: [...new Set([...notification.readby, user.value.uuid])],
-      })),
-    }));
+    markAllNotificationsRead();
   }
 
   function canEditComment(comment) {
@@ -63,6 +91,10 @@ export const useUserStore = defineStore('user', () => {
     user,
     isLogged,
     notifications,
+    // Nouvelles fonctions
+    markNotificationRead,
+    markAllNotificationsRead,
+    // Anciennes fonctions (rétro-compatibilité)
     readNotification,
     readAllNotifications,
     canEditComment,
diff --git a/src/views/Notifications.vue b/src/views/Notifications.vue
index c7db5b1..053eeba 100644
--- a/src/views/Notifications.vue
+++ b/src/views/Notifications.vue
@@ -119,14 +119,24 @@ function changeTab(newValue) {
 
 function readAll() {
   try {
-    api.readAllNotifications();
+    api.markAllNotificationsRead();
   } catch (error) {
     console.log('Could not read all notifications : ', error);
   }
 }
 
 // Functions
-function handleNotificationClick(notification) {
+async function handleNotificationClick(notification) {
+  // Marquer la notification comme lue
+  if (!notification.isRead) {
+    try {
+      await api.markNotificationRead(notification);
+    } catch (error) {
+      console.log('Could not mark notification as read:', error);
+    }
+  }
+
+  // Naviguer vers la cible
   const href =
     notification.type === 'appointment-request'
       ? getHref(notification) + '?tab=designToLight'
diff --git a/vite.config.js b/vite.config.js
index c235442..da73536 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -17,6 +17,7 @@ export default defineConfig(({ mode }) => {
       minify: mode === 'production' ? 'esbuild' : false,
     },
     server: {
+      cors: true,
       watch: {
         ignored: [
           '**/node_modules/**',