diff --git a/frontend/app.js b/frontend/app.js
index 4e3fe74..c6013ef 100755
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -5590,8 +5590,12 @@ const SectionRail = (() => {
       if (!el || el.classList.contains('hidden')) continue;
       const box = el.getBoundingClientRect();
       if (!box.height) continue;
-      // Only count it when it really is pinned to the bottom edge.
-      if (box.bottom >= window.innerHeight - 4) occupied = Math.max(occupied, window.innerHeight - box.top);
+      if (getComputedStyle(el).position !== 'fixed') continue;
+      // Count any fixed bar sitting in the lower half. It must NOT be required
+      // to touch the viewport bottom: on an iPhone XR the bottom nav ends
+      // above the home-indicator gap, so a "bottom >= innerHeight" test missed
+      // it entirely and the rail was parked underneath it.
+      if (box.top > window.innerHeight * 0.5) occupied = Math.max(occupied, window.innerHeight - box.top);
     }
     const want = Math.round(occupied + 14);
     if (st.bottom !== want) {