diff --git a/DataSentinel/src/components/common/KpiCard.jsx b/DataSentinel/src/components/common/KpiCard.jsx
new file mode 100644
index 0000000..c12f4f1
--- /dev/null
+++ b/DataSentinel/src/components/common/KpiCard.jsx
@@ -0,0 +1,10 @@
+import styles from './KpiCard.module.css';
+
+export default function KpiCard({ label, value, color }) {
+  return (
+    <div className={styles.kpiCard}>
+      <span className={styles.kpiValue} style={{ color }}>{value}</span>
+      <span className={styles.kpiLabel}>{label}</span>
+    </div>
+  );
+}
diff --git a/DataSentinel/src/components/common/KpiCard.module.css b/DataSentinel/src/components/common/KpiCard.module.css
new file mode 100644
index 0000000..cf8ef75
--- /dev/null
+++ b/DataSentinel/src/components/common/KpiCard.module.css
@@ -0,0 +1,28 @@
+.kpiCard {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 20px;
+  background: var(--color-white);
+  border-radius: var(--radius);
+  box-shadow: var(--shadow);
+}
+
+.kpiValue {
+  font-size: 36px;
+  font-weight: 700;
+  line-height: 1;
+  margin-bottom: 6px;
+}
+
+.kpiLabel {
+  font-size: 12px;
+  color: var(--color-muted, #888);
+  text-align: center;
+}
+
+@media (max-width: 768px) {
+  .kpiValue {
+    font-size: 28px;
+  }
+}
diff --git a/DataSentinel/src/context/AuthContext.jsx b/DataSentinel/src/context/AuthContext.jsx
index 931718e..aac8a26 100644
--- a/DataSentinel/src/context/AuthContext.jsx
+++ b/DataSentinel/src/context/AuthContext.jsx
@@ -2,16 +2,15 @@
 
 import { createContext, useContext, useState } from 'react';
 import * as api from '../services/api';
+import { USER_KEY } from '../services/api';
 
 const AuthContext = createContext(null);
 
-const STORAGE_KEY = 'ds_user';
-
 /* Fournisseur du contexte d'authentification */
 export function AuthProvider({ children }) {
   const [user, setUser] = useState(() => {
     /* Restauration de la session depuis le localStorage au montage */
-    const stored = localStorage.getItem(STORAGE_KEY);
+    const stored = localStorage.getItem(USER_KEY);
     return stored ? JSON.parse(stored) : null;
   });
 
@@ -19,7 +18,7 @@ export function AuthProvider({ children }) {
   async function login(username, password) {
     const connectedUser = await api.login(username, password);
     setUser(connectedUser);
-    localStorage.setItem(STORAGE_KEY, JSON.stringify(connectedUser));
+    localStorage.setItem(USER_KEY, JSON.stringify(connectedUser));
     return connectedUser;
   }
 
@@ -27,7 +26,7 @@ export function AuthProvider({ children }) {
   function logout() {
     api.clearToken();
     setUser(null);
-    localStorage.removeItem(STORAGE_KEY);
+    localStorage.removeItem(USER_KEY);
   }
 
   /* Booléen pratique pour savoir si l'utilisateur est connecté */
diff --git a/DataSentinel/src/hooks/useApi.js b/DataSentinel/src/hooks/useApi.js
deleted file mode 100644
index 7239bb7..0000000
--- a/DataSentinel/src/hooks/useApi.js
+++ /dev/null
@@ -1,33 +0,0 @@
-/* Hook générique pour les appels API : retourne { data, loading, error, refetch } */
-
-import { useState, useEffect, useCallback } from 'react';
-
-/**
- * @param {Function} fetchFn - Fonction async à appeler (depuis api.js)
- * @param {Array} deps - Dépendances qui déclenchent un re-fetch (optionnel)
- */
-export function useApi(fetchFn, deps = []) {
-  const [data, setData] = useState(null);
-  const [loading, setLoading] = useState(true);
-  const [error, setError] = useState(null);
-
-  const fetch = useCallback(async () => {
-    setLoading(true);
-    setError(null);
-    try {
-      const result = await fetchFn();
-      setData(result);
-    } catch (err) {
-      setError(err.message || 'Une erreur est survenue.');
-    } finally {
-      setLoading(false);
-    }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, deps);
-
-  useEffect(() => {
-    fetch();
-  }, [fetch]);
-
-  return { data, loading, error, refetch: fetch };
-}
diff --git a/DataSentinel/src/pages/Dashboard/Dashboard.jsx b/DataSentinel/src/pages/Dashboard/Dashboard.jsx
index 79c30e2..979484a 100644
--- a/DataSentinel/src/pages/Dashboard/Dashboard.jsx
+++ b/DataSentinel/src/pages/Dashboard/Dashboard.jsx
@@ -4,20 +4,11 @@ import { useState, useEffect, useCallback, useMemo } from 'react';
 import { RefreshCw } from 'lucide-react';
 import { getDashboard, getDashboardSummary, getDashboardFiltres } from '../../services/api';
 import MonitoringCard from '../../components/common/MonitoringCard';
+import KpiCard from '../../components/common/KpiCard';
 import LoadingSpinner from '../../components/common/LoadingSpinner';
 import ErrorMessage from '../../components/common/ErrorMessage';
 import styles from './Dashboard.module.css';
 
-/* Carte KPI affichant un indicateur clé */
-function KpiCard({ label, value, color }) {
-  return (
-    <div className={styles.kpiCard}>
-      <span className={styles.kpiValue} style={{ color }}>{value}</span>
-      <span className={styles.kpiLabel}>{label}</span>
-    </div>
-  );
-}
-
 export default function Dashboard() {
   const [summary, setSummary] = useState(null);
   const [monitorings, setMonitorings] = useState([]);
diff --git a/DataSentinel/src/pages/Dashboard/Dashboard.module.css b/DataSentinel/src/pages/Dashboard/Dashboard.module.css
index 4469834..7113e81 100644
--- a/DataSentinel/src/pages/Dashboard/Dashboard.module.css
+++ b/DataSentinel/src/pages/Dashboard/Dashboard.module.css
@@ -55,29 +55,6 @@
   margin-bottom: 32px;
 }
 
-.kpiCard {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  padding: 20px;
-  background: var(--color-white);
-  border-radius: var(--radius);
-  box-shadow: var(--shadow);
-}
-
-.kpiValue {
-  font-size: 36px;
-  font-weight: 700;
-  line-height: 1;
-  margin-bottom: 6px;
-}
-
-.kpiLabel {
-  font-size: 12px;
-  color: var(--color-muted, #888);
-  text-align: center;
-}
-
 .filtres {
   display: flex;
   gap: 12px;
@@ -131,10 +108,6 @@
     gap: 10px;
   }
 
-  .kpiValue {
-    font-size: 28px;
-  }
-
   .filtres {
     flex-direction: column;
   }