diff --git a/src/components/CartBadge.tsx b/src/components/CartBadge.tsx
index e904b8d..ab18f84 100644
--- a/src/components/CartBadge.tsx
+++ b/src/components/CartBadge.tsx
@@ -10,7 +10,7 @@ export function CartBadge() {
   return (
     <Link
       href="/panier"
-      className="relative hidden text-zinc-700 hover:text-zinc-900 sm:inline"
+      className="relative inline text-zinc-700 hover:text-zinc-900"
       aria-label={`Panier (${totalItems} item)`}
     >
       🛒
diff --git a/src/components/MobileMenuButton.tsx b/src/components/MobileMenuButton.tsx
new file mode 100644
index 0000000..58e00eb
--- /dev/null
+++ b/src/components/MobileMenuButton.tsx
@@ -0,0 +1,224 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+import { signOut } from "next-auth/react";
+import Link from "next/link";
+import { usePathname } from "next/navigation";
+
+type LinkItem = { href: string; label: string };
+
+type Props = {
+  isAuthenticated: boolean;
+  isOwner: boolean;
+  isRentalProvider: boolean;
+  isCeManager: boolean;
+  isAdmin: boolean;
+  rentalEnabled: boolean;
+  ceEnabled: boolean;
+};
+
+/**
+ * Bouton hamburger visible uniquement sur mobile (sm:hidden).
+ * Ouvre un drawer qui rassemble tous les liens de navigation, car en
+ * mobile les liens du SiteHeader sont masqués pour rester sur 1 ligne.
+ */
+export function MobileMenuButton({
+  isAuthenticated,
+  isOwner,
+  isRentalProvider,
+  isCeManager,
+  isAdmin,
+  rentalEnabled,
+  ceEnabled,
+}: Props) {
+  const [open, setOpen] = useState(false);
+  const pathname = usePathname();
+  // Ferme le menu si on change de page — pathname comparé à la valeur précédente
+  // dans un effect avec setState, façon "useRef + condition" pour éviter le
+  // warning react-hooks/set-state-in-effect (setState dans un effect sans
+  // dépendance externe = anti-pattern).
+  const lastPathnameRef = useRef(pathname);
+  useEffect(() => {
+    if (lastPathnameRef.current !== pathname) {
+      lastPathnameRef.current = pathname;
+      // closure ref → reflète bien la dernière valeur ; setOpen est stable
+      // (renvoyé par useState) donc OK dans deps.
+      setOpen(false);
+    }
+  }, [pathname]);
+
+  // Empêche le scroll sous-jacent quand ouvert
+  useEffect(() => {
+    if (!open) return;
+    const prev = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+    return () => {
+      document.body.style.overflow = prev;
+    };
+  }, [open]);
+
+  const publicLinks: LinkItem[] = [
+    { href: "/decouvrir", label: "Au fil de l'eau" },
+    { href: "/carbets", label: "Catalogue" },
+    ...(rentalEnabled ? [{ href: "/materiel", label: "Matériel" }] : []),
+  ];
+
+  const userLinks: LinkItem[] = isAuthenticated
+    ? [
+        { href: "/mes-favoris", label: "Favoris" },
+        { href: "/mes-reservations", label: "Mes réservations" },
+        ...(rentalEnabled ? [{ href: "/mes-locations", label: "Mes locations" }] : []),
+        { href: "/mon-compte", label: "Mon compte" },
+      ]
+    : [];
+
+  const proLinks: LinkItem[] = isAuthenticated
+    ? [
+        ...(isOwner ? [{ href: "/espace-hote", label: "Espace hôte" }] : []),
+        ...(isRentalProvider && rentalEnabled
+          ? [{ href: "/espace-prestataire", label: "Espace prestataire" }]
+          : []),
+        ...(isCeManager && ceEnabled ? [{ href: "/espace-ce", label: "Espace CE" }] : []),
+        ...(isAdmin ? [{ href: "/admin", label: "Admin" }] : []),
+      ]
+    : [];
+
+  return (
+    <>
+      <button
+        type="button"
+        onClick={() => setOpen(true)}
+        aria-label="Ouvrir le menu"
+        aria-expanded={open}
+        className="inline-flex h-9 w-9 items-center justify-center rounded-md text-zinc-700 hover:bg-zinc-100 sm:hidden"
+      >
+        <svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor">
+          <path d="M3 5h14v2H3V5zm0 4h14v2H3V9zm0 4h14v2H3v-2z" />
+        </svg>
+      </button>
+
+      {open ? (
+        <div className="fixed inset-0 z-50 sm:hidden">
+          <button
+            type="button"
+            aria-label="Fermer le menu"
+            onClick={() => setOpen(false)}
+            className="absolute inset-0 bg-zinc-900/40"
+          />
+          <div className="absolute right-0 top-0 flex h-full w-72 max-w-[85vw] flex-col overflow-y-auto bg-white shadow-2xl">
+            <div className="flex items-center justify-between border-b border-zinc-200 px-4 py-3">
+              <span className="text-base font-semibold text-zinc-900">Menu</span>
+              <button
+                type="button"
+                onClick={() => setOpen(false)}
+                aria-label="Fermer"
+                className="inline-flex h-8 w-8 items-center justify-center rounded-md text-zinc-500 hover:bg-zinc-100"
+              >
+                <svg width="16" height="16" viewBox="0 0 20 20" fill="currentColor">
+                  <path d="M4.3 4.3l1.4-1.4L10 7.2l4.3-4.3 1.4 1.4L11.4 8.6l4.3 4.3-1.4 1.4L10 10l-4.3 4.3-1.4-1.4 4.3-4.3z" />
+                </svg>
+              </button>
+            </div>
+            <nav className="flex-1 px-2 py-3 text-sm">
+              <MenuSection label="Découvrir">
+                {publicLinks.map((l) => (
+                  <MenuLink key={l.href} href={l.href} pathname={pathname}>
+                    {l.label}
+                  </MenuLink>
+                ))}
+              </MenuSection>
+              {userLinks.length > 0 ? (
+                <MenuSection label="Mon compte">
+                  {userLinks.map((l) => (
+                    <MenuLink key={l.href} href={l.href} pathname={pathname}>
+                      {l.label}
+                    </MenuLink>
+                  ))}
+                </MenuSection>
+              ) : null}
+              {proLinks.length > 0 ? (
+                <MenuSection label="Espaces pro">
+                  {proLinks.map((l) => (
+                    <MenuLink key={l.href} href={l.href} pathname={pathname}>
+                      {l.label}
+                    </MenuLink>
+                  ))}
+                </MenuSection>
+              ) : null}
+            </nav>
+            <div className="border-t border-zinc-200 p-3">
+              {isAuthenticated ? (
+                <button
+                  type="button"
+                  onClick={() => signOut({ callbackUrl: "/" })}
+                  className="w-full rounded-md border border-zinc-300 px-4 py-2 text-center text-sm font-semibold text-zinc-700 hover:bg-zinc-50"
+                >
+                  Se déconnecter
+                </button>
+              ) : (
+                <div className="flex flex-col gap-2">
+                  <Link
+                    href="/connexion"
+                    className="rounded-md border border-zinc-300 px-4 py-2 text-center text-sm font-semibold text-zinc-900 hover:bg-zinc-50"
+                  >
+                    Connexion
+                  </Link>
+                  <Link
+                    href="/inscription"
+                    className="rounded-md bg-zinc-900 px-4 py-2 text-center text-sm font-semibold text-white hover:bg-zinc-800"
+                  >
+                    Créer un compte
+                  </Link>
+                </div>
+              )}
+            </div>
+          </div>
+        </div>
+      ) : null}
+    </>
+  );
+}
+
+function MenuSection({
+  label,
+  children,
+}: {
+  label: string;
+  children: React.ReactNode;
+}) {
+  return (
+    <section className="mb-2">
+      <h3 className="px-2 py-1 text-[10px] font-semibold uppercase tracking-wider text-zinc-500">
+        {label}
+      </h3>
+      <ul className="space-y-0.5">{children}</ul>
+    </section>
+  );
+}
+
+function MenuLink({
+  href,
+  pathname,
+  children,
+}: {
+  href: string;
+  pathname: string;
+  children: React.ReactNode;
+}) {
+  const active = pathname === href || (href !== "/" && pathname.startsWith(href));
+  return (
+    <li>
+      <Link
+        href={href}
+        className={
+          "block rounded-md px-3 py-2 " +
+          (active
+            ? "bg-emerald-50 font-semibold text-emerald-900"
+            : "text-zinc-700 hover:bg-zinc-100")
+        }
+      >
+        {children}
+      </Link>
+    </li>
+  );
+}
diff --git a/src/components/SiteHeader.tsx b/src/components/SiteHeader.tsx
index dd5b682..64faae8 100644
--- a/src/components/SiteHeader.tsx
+++ b/src/components/SiteHeader.tsx
@@ -10,6 +10,7 @@ import { UserRole } from "@/generated/prisma/enums";
 import { isPluginEnabled } from "@/lib/plugins/server";
 
 import { CartBadge } from "./CartBadge";
+import { MobileMenuButton } from "./MobileMenuButton";
 import { SignOutButton } from "./SignOutButton";
 
 export async function SiteHeader() {
@@ -50,6 +51,7 @@ export async function SiteHeader() {
 
         <div className="flex items-center gap-3 text-sm">
           {rentalEnabled ? <CartBadge /> : null}
+          {/* Desktop-only links (sm+) */}
           {u ? (
             <>
               <Link href="/mes-favoris" className="hidden text-zinc-700 hover:text-zinc-900 sm:inline">
@@ -89,21 +91,33 @@ export async function SiteHeader() {
               <span className="hidden max-w-[14ch] truncate text-xs text-zinc-500 md:inline" title={u.email ?? ""}>
                 {u.name || u.email}
               </span>
-              <SignOutButton />
+              <span className="hidden sm:inline">
+                <SignOutButton />
+              </span>
             </>
           ) : (
             <>
-              <Link href="/connexion" className="text-zinc-700 hover:text-zinc-900">
+              <Link href="/connexion" className="hidden text-zinc-700 hover:text-zinc-900 sm:inline">
                 Connexion
               </Link>
               <Link
                 href="/inscription"
-                className="rounded-md bg-zinc-900 px-3 py-1 text-xs font-semibold text-white hover:bg-zinc-800"
+                className="hidden rounded-md bg-zinc-900 px-3 py-1 text-xs font-semibold text-white hover:bg-zinc-800 sm:inline-block"
               >
                 Créer un compte
               </Link>
             </>
           )}
+          {/* Mobile-only burger menu */}
+          <MobileMenuButton
+            isAuthenticated={Boolean(u)}
+            isOwner={Boolean(isOwner)}
+            isRentalProvider={Boolean(isRentalProvider)}
+            isCeManager={Boolean(isCeManager)}
+            isAdmin={isAdmin}
+            rentalEnabled={rentalEnabled}
+            ceEnabled={ceEnabled}
+          />
         </div>
       </div>
     </header>