diff --git a/static/js/app.js b/static/js/app.js
index a49e780..32bdeee 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -2924,8 +2924,17 @@ const _IMM_DELAY = 5000;
 const _IMM_EDGE  = 60; // px from top/bottom edge
 
 function _immMouseMove(e) {
-  const atTop    = e.clientY < _IMM_EDGE;
-  const atBottom = e.clientY > window.innerHeight - _IMM_EDGE;
+  // When bars are already showing, extend threshold to cover their actual height
+  const topThreshold = _immTopShowing
+    ? (document.querySelector('.navbar')?.offsetHeight ?? 0) +
+      (document.querySelector('.reader-header')?.offsetHeight ?? 0) + 12
+    : _IMM_EDGE;
+  const bottomThreshold = _immBottomShowing
+    ? (document.querySelector('.now-playing-bar')?.offsetHeight ?? 0) + 12
+    : _IMM_EDGE;
+
+  const atTop    = e.clientY < topThreshold;
+  const atBottom = e.clientY > window.innerHeight - bottomThreshold;
   if (atTop !== _immTopShowing) {
     _immTopShowing = atTop;
     document.body.classList.toggle('reader-show-top', atTop);