diff --git a/app/public/index.php b/app/public/index.php
index 30c2eee..e596c68 100644
--- a/app/public/index.php
+++ b/app/public/index.php
@@ -215,6 +215,7 @@ $router->addRoute('GET', '/users', 'UserController@index', true);
 $router->addRoute('GET', '/users/create', 'UserController@showCreateForm', true);
 $router->addRoute('POST', '/users/create', 'UserController@create', true);
 $router->addRoute('POST', '/users/delete', 'UserController@delete', true);
+$router->addRoute('POST', '/users/toggle-admin', 'UserController@toggleAdminRole', true);
 $router->addRoute('GET', '/logout', 'AuthController@logout', true);
 
 // Exécuter le routage
diff --git a/app/src/Controllers/UserController.php b/app/src/Controllers/UserController.php
index 85b4a31..e13aebb 100644
--- a/app/src/Controllers/UserController.php
+++ b/app/src/Controllers/UserController.php
@@ -7,6 +7,7 @@ use App\Services\AuthService;
 use App\Services\LogService;
 use App\Services\LanguageService;
 use App\Utils\DarkMode;
+use \PDOException;
 
 /**
  * Contrôleur pour la gestion des utilisateurs.
@@ -210,4 +211,76 @@ class UserController
         header('Location: /users');
         exit();
     }
+
+    /**
+     * Modifie le rôle d'un utilisateur (admin/user).
+     */
+    public function toggleAdminRole()
+    {
+        $this->requireAdmin();
+
+        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+            header('Location: /users');
+            exit();
+        }
+
+        $userIdToModify = $_POST['user_id'] ?? null;
+        $ipAddress = $_SERVER['REMOTE_ADDR'];
+        $adminUserId = $this->authService->getUserId();
+
+        if (empty($userIdToModify)) {
+            $_SESSION['error'] = $this->langService->__('user_role_error_id_missing'); // Nouvelle chaîne de langue
+            header('Location: /users');
+            exit();
+        }
+
+        // Récupérer les informations de l'utilisateur à modifier
+        $stmt = $this->db->prepare("SELECT username, role FROM users WHERE id = ?");
+        $stmt->execute([$userIdToModify]);
+        $userToModify = $stmt->fetch();
+
+        if (!$userToModify) {
+            $_SESSION['error'] = $this->langService->__('user_not_found'); // Nouvelle chaîne de langue (ou existante)
+            header('Location: /users');
+            exit();
+        }
+
+        // Empêcher la modification du rôle de l'utilisateur "admin" (ou un nom spécifique)
+        // ou de son propre rôle si c'est l'admin connecté
+        if ($userToModify['username'] === 'admin' || $userIdToModify == $adminUserId) {
+            $_SESSION['error'] = $this->langService->__('cannot_change_admin_role'); // Nouvelle chaîne de langue
+            $this->logService->log('warning', "Tentative de modification du rôle de l'administrateur principal ou de soi-même par l'admin ID: {$adminUserId}.", $adminUserId, $ipAddress);
+            header('Location: /users');
+            exit();
+        }
+
+        $newRole = ($userToModify['role'] === 'admin') ? 'user' : 'admin';
+
+        // Si on retire le rôle admin, vérifier qu'il en reste au moins un autre
+        if ($newRole === 'user' && $userToModify['role'] === 'admin') {
+            $stmt = $this->db->query("SELECT COUNT(*) FROM users WHERE role = 'admin'");
+            $adminCount = $stmt->fetchColumn();
+            if ($adminCount <= 1) {
+                $_SESSION['error'] = $this->langService->__('cannot_remove_last_admin_role'); // Nouvelle chaîne de langue
+                $this->logService->log('warning', "Tentative de suppression du dernier rôle admin par l'admin ID: {$adminUserId}.", $adminUserId, $ipAddress);
+                header('Location: /users');
+                exit();
+            }
+        }
+
+        try {
+            $stmt = $this->db->prepare("UPDATE users SET role = ? WHERE id = ?");
+            $stmt->execute([$newRole, $userIdToModify]);
+
+            $this->logService->log('info', "Rôle de l'utilisateur '{$userToModify['username']}' (ID: {$userIdToModify}) changé en '{$newRole}' par l'administrateur ID: {$adminUserId}.", $adminUserId, $ipAddress);
+            $_SESSION['success'] = $this->langService->__('user_role_updated_success', ['username' => htmlspecialchars($userToModify['username']), 'role' => htmlspecialchars($newRole)]); // Nouvelle chaîne de langue
+        } catch (\PDOException $e) {
+            error_log("Erreur lors du changement de rôle de l'utilisateur: " . $e->getMessage());
+            $_SESSION['error'] = $this->langService->__('user_role_update_error_db'); // Nouvelle chaîne de langue
+            $this->logService->log('error', "Échec changement de rôle pour utilisateur ID: {$userIdToModify}: " . $e->getMessage(), $adminUserId, $ipAddress);
+        }
+
+        header('Location: /users');
+        exit();
+    }
 }
diff --git a/app/src/Lang/ar.json b/app/src/Lang/ar.json
index dc58b11..d9089e0 100644
--- a/app/src/Lang/ar.json
+++ b/app/src/Lang/ar.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Auto-translated 'User not found for deletion.' to Arabic",
     "user_delete_error_db": "Auto-translated 'Error deleting user from the database.' to Arabic",
     "self_delete_not_allowed": "Auto-translated 'You cannot delete yourself.' to Arabic",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/de.json b/app/src/Lang/de.json
index 688a858..baea4bd 100644
--- a/app/src/Lang/de.json
+++ b/app/src/Lang/de.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Benutzer zum Löschen nicht gefunden.",
     "user_delete_error_db": "Fehler beim Löschen des Benutzers aus der Datenbank.",
     "self_delete_not_allowed": "Sie können sich nicht selbst löschen.",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/en.json b/app/src/Lang/en.json
index c386ecd..2bcc27e 100644
--- a/app/src/Lang/en.json
+++ b/app/src/Lang/en.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "User not found for deletion.",
     "user_delete_error_db": "Error deleting user from the database.",
     "self_delete_not_allowed": "You cannot delete yourself.",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/es.json b/app/src/Lang/es.json
index 6066b3b..1338841 100644
--- a/app/src/Lang/es.json
+++ b/app/src/Lang/es.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Usuario no encontrado para la eliminación.",
     "user_delete_error_db": "Error al eliminar el usuario de la base de datos.",
     "self_delete_not_allowed": "No puedes eliminarte a ti mismo.",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/fr.json b/app/src/Lang/fr.json
index d1d0dcc..60795e0 100644
--- a/app/src/Lang/fr.json
+++ b/app/src/Lang/fr.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Utilisateur introuvable pour la suppression.",
     "user_delete_error_db": "Erreur lors de la suppression de l'utilisateur dans la base de données.",
     "self_delete_not_allowed": "Vous ne pouvez pas vous supprimer vous-même.",
+    "user_role_error_id_missing": "ID utilisateur manquant pour la modification du rôle.",
+    "user_not_found": "Utilisateur non trouvé.",
+    "cannot_change_admin_role": "Le rôle de l'administrateur principal ou son propre rôle ne peut être modifié.",
+    "cannot_remove_last_admin_role": "Impossible de retirer le statut d'administrateur au dernier administrateur.",
+    "user_role_updated_success": "Le rôle de l'utilisateur '{username}' a été changé en '{role}' avec succès.",
+    "user_role_update_error_db": "Erreur de base de données lors de la mise à jour du rôle de l'utilisateur.",
+    "confirm_toggle_admin_role": "Êtes-vous sûr de vouloir modifier le rôle de cet utilisateur ?",
+    "remove_admin_status": "Retirer Admin",
+    "pass_to_admin": "Passer Admin",
+    "cannot_change_main_admin_role": "Rôle non modifiable"
     "cert_revoke_success_intermediate": "Le certificat intermédiaire '{name}' a été révoqué avec succès et la CRL du CA Racine a été mise à jour.",
     "cert_revoke_warn_crl_update_failed_intermediate": "Le certificat intermédiaire '{name}' a été révoqué, mais la mise à jour de la CRL du CA Racine a rencontré un problème. Veuillez contacter un administrateur.",
     "cert_revoke_error_intermediate": "Erreur lors de la révocation du certificat intermédiaire '{name}': {output}"
diff --git a/app/src/Lang/hi.json b/app/src/Lang/hi.json
index 4c2b6ac..a08ceab 100644
--- a/app/src/Lang/hi.json
+++ b/app/src/Lang/hi.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Auto-translated 'User not found for deletion.' to Hindi",
     "user_delete_error_db": "Auto-translated 'Error deleting user from the database.' to Hindi",
     "self_delete_not_allowed": "Auto-translated 'You cannot delete yourself.' to Hindi",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/it.json b/app/src/Lang/it.json
index f4ff71b..12197e0 100644
--- a/app/src/Lang/it.json
+++ b/app/src/Lang/it.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Utente non trovato per l'eliminazione.",
     "user_delete_error_db": "Errore durante l'eliminazione dell'utente dal database.",
     "self_delete_not_allowed": "Non puoi eliminare te stesso.",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/ja.json b/app/src/Lang/ja.json
index f3e9c14..7bf1982 100644
--- a/app/src/Lang/ja.json
+++ b/app/src/Lang/ja.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Auto-translated 'User not found for deletion.' to Japanese",
     "user_delete_error_db": "Auto-translated 'Error deleting user from the database.' to Japanese",
     "self_delete_not_allowed": "Auto-translated 'You cannot delete yourself.' to Japanese",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/pt.json b/app/src/Lang/pt.json
index 1217d40..3f6cb87 100644
--- a/app/src/Lang/pt.json
+++ b/app/src/Lang/pt.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Utilizador não encontrado para eliminação.",
     "user_delete_error_db": "Erro ao eliminar utilizador da base de dados.",
     "self_delete_not_allowed": "Não pode eliminar-se a si mesmo.",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/ru.json b/app/src/Lang/ru.json
index fae4f0b..9a4b6ce 100644
--- a/app/src/Lang/ru.json
+++ b/app/src/Lang/ru.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Auto-translated 'User not found for deletion.' to Russian",
     "user_delete_error_db": "Auto-translated 'Error deleting user from the database.' to Russian",
     "self_delete_not_allowed": "Auto-translated 'You cannot delete yourself.' to Russian",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Lang/zh.json b/app/src/Lang/zh.json
index ac9f50d..285ebb8 100644
--- a/app/src/Lang/zh.json
+++ b/app/src/Lang/zh.json
@@ -81,6 +81,16 @@
     "user_delete_error_not_found": "Auto-translated 'User not found for deletion.' to Chinese",
     "user_delete_error_db": "Auto-translated 'Error deleting user from the database.' to Chinese",
     "self_delete_not_allowed": "Auto-translated 'You cannot delete yourself.' to Chinese",
+    "user_role_error_id_missing": "User ID missing for role modification.",
+    "user_not_found": "User not found.",
+    "cannot_change_admin_role": "The main administrator's role or your own role cannot be modified.",
+    "cannot_remove_last_admin_role": "Cannot remove administrator status from the last administrator.",
+    "user_role_updated_success": "User '{username}' role has been successfully changed to '{role}'.",
+    "user_role_update_error_db": "Database error while updating user role.",
+    "confirm_toggle_admin_role": "Are you sure you want to modify this user's role?",
+    "remove_admin_status": "Remove Admin",
+    "pass_to_admin": "Make Admin",
+    "cannot_change_main_admin_role": "Role not modifiable"
     "cert_revoke_success_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been successfully revoked and the Root CA CRL has been updated.",
     "cert_revoke_warn_crl_update_failed_intermediate": "NEEDS TRANSLATION: Intermediate certificate '{name}' has been revoked, but updating the Root CA CRL encountered an issue. Please contact an administrator.",
     "cert_revoke_error_intermediate": "NEEDS TRANSLATION: Error revoking intermediate certificate '{name}': {output}"
diff --git a/app/src/Views/users/index.php b/app/src/Views/users/index.php
index 9396bce..3012824 100644
--- a/app/src/Views/users/index.php
+++ b/app/src/Views/users/index.php
@@ -36,13 +36,26 @@ require_once APP_ROOT_DIR . '/src/Views/shared/header.php';
                                 <td><?= htmlspecialchars($user['username']) ?></td>
                                 <td><?= htmlspecialchars($translations[$user['role']] ?? $user['role']) ?></td>
                                 <td><?= htmlspecialchars((new DateTime($user['created_at']))->format('Y-m-d H:i:s')) ?></td>
-                                <td>
-                                    <?php if ($user['id'] !== $authService->getUserId()): // Impossible de supprimer son propre compte ?>
+                                <td class="actions-cell"> <!-- Ajout d'une classe pour styliser si besoin -->
+                                    <?php if ($user['username'] !== 'admin' && $user['id'] !== $authService->getUserId()): ?>
+                                        <form action="/users/toggle-admin" method="post" class="inline-form" onsubmit="return confirm('<?= htmlspecialchars($translations['confirm_toggle_admin_role'] ?? 'Êtes-vous sûr de vouloir modifier le rôle de cet utilisateur ?') ?>');">
+                                            <input type="hidden" name="user_id" value="<?= htmlspecialchars($user['id']) ?>">
+                                            <?php if ($user['role'] === 'admin'): ?>
+                                                <button type="submit" class="button warning-button"><?= htmlspecialchars($translations['remove_admin_status'] ?? 'Retirer Admin') ?></button>
+                                            <?php else: ?>
+                                                <button type="submit" class="button primary-button"><?= htmlspecialchars($translations['pass_to_admin'] ?? 'Passer Admin') ?></button>
+                                            <?php endif; ?>
+                                        </form>
+                                    <?php elseif ($user['username'] === 'admin'): ?>
+                                        <em><?= htmlspecialchars($translations['cannot_change_main_admin_role'] ?? 'Rôle non modifiable') ?></em>
+                                    <?php endif; ?>
+
+                                    <?php if ($user['id'] !== $authService->getUserId() && $user['username'] !== 'admin'): // Condition existante pour la suppression, légèrement ajustée pour être sûr que 'admin' n'est pas supprimable non plus via cette interface ?>
                                         <form action="/users/delete" method="post" class="inline-form" onsubmit="return confirm('<?= htmlspecialchars($translations['confirm_delete_user']) ?>');">
                                             <input type="hidden" name="user_id" value="<?= htmlspecialchars($user['id']) ?>">
                                             <button type="submit" class="button danger-button"><?= htmlspecialchars($translations['delete_user']) ?></button>
                                         </form>
-                                    <?php else: ?>
+                                    <?php elseif ($user['id'] === $authService->getUserId() && $user['username'] !== 'admin'): // Permet à l'admin de voir "non modifiable" pour lui meme, mais pas "auto suppression interdite" si c'est admin ?>
                                         <em><?= htmlspecialchars($translations['self_delete_not_allowed']) ?></em>
                                     <?php endif; ?>
                                 </td>