diff --git a/my-library/src/App.jsx b/my-library/src/App.jsx
index ff39111..a10b954 100644
--- a/my-library/src/App.jsx
+++ b/my-library/src/App.jsx
@@ -1,4 +1,4 @@
-import { Routes, Route } from 'react-router-dom';
+import { Routes, Route, Navigate } from 'react-router-dom';
 import Layout from './components/Layout';
 import Home from './pages/Home';
 import Books from './pages/Books';
@@ -8,19 +8,34 @@ import NotFound from './pages/NotFound';
 import AddBook from './pages/AddBook';
 import BookDetail from './pages/BookDetail';
 import Customers from './pages/Customers';
+import Login from './pages/Login';
+import { useAuth } from './context/AuthContext';
+
+function RequireAuth({ children }) {
+  const { user } = useAuth();
+  return user ? children : <Navigate to="/login" replace />;
+}
+
+function RequireAdmin({ children }) {
+  const { user } = useAuth();
+  if (!user) return <Navigate to="/login" replace />;
+  if (user.role !== 'admin') return <Navigate to="/" replace />;
+  return children;
+}
 
 export default function App() {
   return (
     <Routes>
+      <Route path="/login" element={<Login />} />
       <Route path="/" element={<Layout />}>
         <Route index element={<Home />} />
         <Route path="books" element={<Books />} />
-        <Route path="orders" element={<Orders />} />
-        <Route path="profile" element={<Profile />} />
+        <Route path="books/:bookId" element={<RequireAuth><BookDetail /></RequireAuth>} />
+        <Route path="books/new" element={<RequireAdmin><AddBook /></RequireAdmin>} />
+        <Route path="orders" element={<RequireAuth><Orders /></RequireAuth>} />
+        <Route path="profile" element={<RequireAuth><Profile /></RequireAuth>} />
+        <Route path="customers" element={<RequireAdmin><Customers /></RequireAdmin>} />
         <Route path="*" element={<NotFound />} />
-        <Route path="books/new" element={<AddBook />} />
-        <Route path="books/:bookId" element={<BookDetail />} />
-        <Route path="customers" element={<Customers />} />
       </Route>
     </Routes>
   );
diff --git a/my-library/src/components/Navbar.jsx b/my-library/src/components/Navbar.jsx
index c60e798..84dce88 100644
--- a/my-library/src/components/Navbar.jsx
+++ b/my-library/src/components/Navbar.jsx
@@ -1,7 +1,16 @@
-import { Link } from 'react-router-dom';
+import { Link, useNavigate } from 'react-router-dom';
+import { useAuth } from '../context/AuthContext';
 import '../styles/navbar.css';
 
 export default function Navbar() {
+  const { user, logout } = useAuth();
+  const navigate = useNavigate();
+
+  function handleLogout() {
+    logout();
+    navigate('/login');
+  }
+
   return (
     <nav className="navbar">
       <Link to="/" className="navbar__logo">Biblio</Link>
@@ -9,13 +18,20 @@ export default function Navbar() {
       <ul className="navbar__links">
         <li><Link to="/">Accueil</Link></li>
         <li><Link to="/books">Catalogue</Link></li>
-        <li><Link to="/orders">Commandes</Link></li>
-        <li><Link to="/profile">Mon compte</Link></li>
+        {user && <li><Link to="/orders">Commandes</Link></li>}
+        {user && <li><Link to="/profile">Mon compte</Link></li>}
+        {user?.role === 'admin' && <li><Link to="/customers">Clients</Link></li>}
       </ul>
 
       <div className="navbar__actions">
-        <button className="btn-ghost">Connexion</button>
-        <button className="btn-cta">S'inscrire</button>
+        {user ? (
+          <>
+            <span>{user.username} ({user.role})</span>
+            <button onClick={handleLogout}>Déconnexion</button>
+          </>
+        ) : (
+          <Link to="/login"><button>Connexion</button></Link>
+        )}
       </div>
     </nav>
   );
diff --git a/my-library/src/context/AuthContext.js b/my-library/src/context/AuthContext.js
new file mode 100644
index 0000000..c9e5c41
--- /dev/null
+++ b/my-library/src/context/AuthContext.js
@@ -0,0 +1,39 @@
+import { createContext, useContext, useState } from 'react';
+
+const USERS = [
+  { username: 'admin', password: 'admin', role: 'admin' },
+  { username: 'alice', password: 'bob', role: 'user' },
+];
+
+const AuthContext = createContext(null);
+
+export function AuthProvider({ children }) {
+  const [user, setUser] = useState(() => {
+    const saved = localStorage.getItem('auth');
+    return saved ? JSON.parse(saved) : null;
+  });
+
+  function login(username, password) {
+    const found = USERS.find(u => u.username === username && u.password === password);
+    if (!found) return false;
+    const { password: _, ...safe } = found;
+    setUser(safe);
+    localStorage.setItem('auth', JSON.stringify(safe));
+    return true;
+  }
+
+  function logout() {
+    setUser(null);
+    localStorage.removeItem('auth');
+  }
+
+  return (
+    <AuthContext.Provider value={{ user, login, logout }}>
+      {children}
+    </AuthContext.Provider>
+  );
+}
+
+export function useAuth() {
+  return useContext(AuthContext);
+}
diff --git a/my-library/src/index.js b/my-library/src/index.js
index 7b56730..71c19cb 100644
--- a/my-library/src/index.js
+++ b/my-library/src/index.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import ReactDOM from 'react-dom/client';
 import { BrowserRouter } from 'react-router-dom';
+import { AuthProvider } from './context/AuthContext';
 import App from './App';
 import './styles/global.css';
 
@@ -8,7 +9,9 @@ const root = ReactDOM.createRoot(document.getElementById('root'));
 root.render(
   <React.StrictMode>
     <BrowserRouter>
-      <App />
+      <AuthProvider>
+        <App />
+      </AuthProvider>
     </BrowserRouter>
   </React.StrictMode>
 );
\ No newline at end of file
diff --git a/my-library/src/pages/BookDetail.jsx b/my-library/src/pages/BookDetail.jsx
index 68194d6..77cf45c 100644
--- a/my-library/src/pages/BookDetail.jsx
+++ b/my-library/src/pages/BookDetail.jsx
@@ -1,14 +1,35 @@
 import { useState, useEffect } from 'react';
 import { useParams, Link } from 'react-router-dom';
-import { getBookById } from '../api/books';
+import { getBookById, reserveBook } from '../api/books';
+import { useAuth } from '../context/AuthContext';
 
 export default function BookDetail() {
-  const { bookId } = useParams();  
+  const { user } = useAuth();
+  const { bookId } = useParams();
   const [book, setBook] = useState(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(null);
+  const [phoneNumber, setPhoneNumber] = useState('');
+  const [reservationStatus, setReservationStatus] = useState(null);
+  const [reserving, setReserving] = useState(false);
 
-  useEffect(() => {getBookById(bookId).then((response) => setBook(response.data)).catch((err) => {console.error(err);setError('Livre introuvable.');}).finally(() => setLoading(false));}, [bookId]);             
+  useEffect(() => { getBookById(bookId).then((response) => setBook(response.data)).catch((err) => { console.error(err); setError('Livre introuvable.'); }).finally(() => setLoading(false)); }, [bookId]);
+
+  function handleReservation(e) {
+    e.preventDefault();
+    setReserving(true);
+    setReservationStatus(null);
+    reserveBook(bookId, { phoneNumber })
+      .then(() => {
+        setReservationStatus({ success: true, message: 'Réservation effectuée avec succès !' });
+        setPhoneNumber('');
+      })
+      .catch((err) => {
+        const msg = err.response?.data || 'Erreur lors de la réservation.';
+        setReservationStatus({ success: false, message: msg });
+      })
+      .finally(() => setReserving(false));
+  }
 
   if (loading) return <main><p>Chargement…</p></main>;
   if (error) return <main><p>{error}</p><Link to="/books">← Retour au catalogue</Link></main>;
@@ -26,6 +47,30 @@ export default function BookDetail() {
       <p>Langue : {book.language}</p>
       <p>Catégories : {book.categories?.join(', ')}</p>
       {book.description && <p>{book.description}</p>}
+
+      {user?.role === 'user' && <section>
+        <h2>Réserver ce livre</h2>
+        <form onSubmit={handleReservation}>
+          <label>
+            Numéro de téléphone :
+            <input
+              type="tel"
+              value={phoneNumber}
+              onChange={(e) => setPhoneNumber(e.target.value)}
+              placeholder="0612345678"
+              required
+            />
+          </label>
+          <button type="submit" disabled={reserving}>
+            {reserving ? 'Réservation…' : 'Réserver'}
+          </button>
+        </form>
+        {reservationStatus && (
+          <p style={{ color: reservationStatus.success ? 'green' : 'red' }}>
+            {reservationStatus.message}
+          </p>
+        )}
+      </section>}
     </main>
   );
 }
\ No newline at end of file
diff --git a/my-library/src/pages/Books.jsx b/my-library/src/pages/Books.jsx
index 0c283e5..e4d4115 100644
--- a/my-library/src/pages/Books.jsx
+++ b/my-library/src/pages/Books.jsx
@@ -1,8 +1,10 @@
 import { useState, useEffect } from 'react';
 import { getBooks } from '../api/books';
 import { Link } from 'react-router-dom';
+import { useAuth } from '../context/AuthContext';
 
 export default function Books() {
+  const { user } = useAuth();
   const [books, setBooks] = useState([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(null);
@@ -28,7 +30,7 @@ export default function Books() {
   return (
     <main>
       <h1>Catalogue</h1>
-      <Link to="/books/new">+ Ajouter un livre</Link>
+      {user?.role === 'admin' && <Link to="/books/new">+ Ajouter un livre</Link>}
       <ul>
         {books.map((book) => (
           <li key={book.isbn}>
diff --git a/my-library/src/pages/Login.jsx b/my-library/src/pages/Login.jsx
new file mode 100644
index 0000000..1e0689d
--- /dev/null
+++ b/my-library/src/pages/Login.jsx
@@ -0,0 +1,57 @@
+import { useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { useAuth } from '../context/AuthContext';
+
+export default function Login() {
+  const { login } = useAuth();
+  const navigate = useNavigate();
+  const [form, setForm] = useState({ username: '', password: '' });
+  const [error, setError] = useState(null);
+
+  function handleSubmit(e) {
+    e.preventDefault();
+    const ok = login(form.username, form.password);
+    if (ok) {
+      navigate('/');
+    } else {
+      setError('Identifiants incorrects.');
+    }
+  }
+
+  return (
+    <main>
+      <h1>Connexion</h1>
+      <form onSubmit={handleSubmit}>
+        <div>
+          <label>
+            Nom d'utilisateur :
+            <input
+              type="text"
+              value={form.username}
+              onChange={e => setForm(f => ({ ...f, username: e.target.value }))}
+              required
+            />
+          </label>
+        </div>
+        <div>
+          <label>
+            Mot de passe :
+            <input
+              type="password"
+              value={form.password}
+              onChange={e => setForm(f => ({ ...f, password: e.target.value }))}
+              required
+            />
+          </label>
+        </div>
+        <button type="submit">Se connecter</button>
+        {error && <p style={{ color: 'red' }}>{error}</p>}
+      </form>
+      <p>Comptes disponibles :</p>
+      <ul>
+        <li><strong>admin</strong> / admin (administrateur)</li>
+        <li><strong>user</strong> / user (utilisateur)</li>
+      </ul>
+    </main>
+  );
+}