diff --git a/ui-electrobun/src/mainview/App.svelte b/ui-electrobun/src/mainview/App.svelte
index 98aa2a1..cb12bde 100644
--- a/ui-electrobun/src/mainview/App.svelte
+++ b/ui-electrobun/src/mainview/App.svelte
@@ -95,6 +95,9 @@
   function onDragStart(e: MouseEvent) {
     const target = e.target as HTMLElement;
     if (target.tagName === 'BUTTON' || target.tagName === 'INPUT' || target.closest('button') || target.closest('.rz')) return;
+    // Don't drag if click is within the resize border zone (8px from any edge)
+    const B = 8;
+    if (e.clientX < B || e.clientY < B || e.clientX > window.innerWidth - B || e.clientY > window.innerHeight - B) return;
     // Delegate to GTK — the WM handles everything (smooth, zero CPU)
     appRpc.request['window.beginMove']({
       button: e.button + 1, // DOM: 0=left, GTK: 1=left