diff --git a/frontend/src/components/UserMenu.jsx b/frontend/src/components/UserMenu.jsx
index 823b36c..1544e68 100644
--- a/frontend/src/components/UserMenu.jsx
+++ b/frontend/src/components/UserMenu.jsx
@@ -121,15 +121,17 @@ export default function UserMenu() {
   const computePosition = useCallback(() => {
     if (!triggerRef.current) return;
     const r = triggerRef.current.getBoundingClientRect();
+    // visualViewport est fiable sur Safari mobile (window.innerHeight ne l'est pas)
+    const vh = window.visualViewport ? window.visualViewport.height : window.innerHeight;
 
     let mainLeft, mainBottom, mainWidth;
     if (sidebarCollapsed) {
       mainLeft   = r.right + 8;
-      mainBottom = window.innerHeight - r.bottom;
+      mainBottom = vh - r.bottom;
       mainWidth  = POPUP_W;
     } else {
       mainLeft   = r.left;
-      mainBottom = window.innerHeight - r.top + 6;
+      mainBottom = vh - r.top + 6;
       mainWidth  = r.width;
     }
 
@@ -164,9 +166,21 @@ export default function UserMenu() {
     return () => document.removeEventListener('mousedown', onDown);
   }, [open, closeMenu]);
 
-  /* Recalcul si sidebar change */
+  /* Recalcul si sidebar change ou si visualViewport change (Safari mobile) */
   useEffect(() => { if (open) computePosition(); }, [sidebarCollapsed, open, computePosition]);
 
+  useEffect(() => {
+    if (!open) return;
+    const vp = window.visualViewport;
+    if (!vp) return;
+    vp.addEventListener('resize', computePosition);
+    vp.addEventListener('scroll', computePosition);
+    return () => {
+      vp.removeEventListener('resize', computePosition);
+      vp.removeEventListener('scroll', computePosition);
+    };
+  }, [open, computePosition]);
+
   /* Handlers ouverture */
   const onWrapEnter    = () => { if (sidebarCollapsed) { clearClose(); openMenu(); } };
   const onWrapLeave    = () => { if (sidebarCollapsed) scheduleClose(); };