diff --git a/tests/test_mobile.py b/tests/test_mobile.py
new file mode 100644
index 0000000..7be186f
--- /dev/null
+++ b/tests/test_mobile.py
@@ -0,0 +1,35 @@
+"""Mobile : tiroir, pied et menu compte.
+
+Bugs signalés sur captures (29 octobre 2026) :
+- tiroir rétréci à 68 px en mobile quand l'état « replié » desktop
+  était mémorisé (spécificité de `body.sidebar-collapsed .sidebar`) ;
+- pied de sidebar masqué en mobile (`display: none`) ;
+- Profil / Déconnexion du menu compte draco sans effet (onAction
+  ne les prenait pas en charge).
+"""
+
+
+def test_tiroir_mobile_largeur_fixe():
+    css = open("static/css/style.css", encoding="utf-8").read()
+    assert "body.sidebar-collapsed .sidebar,\n    body.sidebar-open.sidebar-collapsed .sidebar { width: 264px; }" in css
+    assert "body.sidebar-open { overflow: hidden; }" in css
+
+
+def test_pied_visible_en_mobile():
+    css = open("static/css/style.css", encoding="utf-8").read()
+    assert ".side-foot { display: none; }" not in css
+    assert "body.sidebar-collapsed .side-foot-meta { display: flex; }" in css
+
+
+def test_menu_compte_draco_fonctionnel():
+    tpl = open("app/templates/_draco_bar.html", encoding="utf-8").read()
+    assert 'act === "profil"' in tpl
+    assert 'location.href = "/profile"' in tpl
+    assert 'act === "deconnexion"' in tpl
+    assert 'location.href = "/logout"' in tpl
+
+
+def test_tiroir_ferme_en_mobile():
+    js = open("static/js/nav.js", encoding="utf-8").read()
+    assert "window.innerWidth <= 900" in js
+    assert "querySelectorAll('.side-link')" in js