diff --git a/src/systems/CameraSystem.ts b/src/systems/CameraSystem.ts
index ca995ef..7d507fd 100644
--- a/src/systems/CameraSystem.ts
+++ b/src/systems/CameraSystem.ts
@@ -26,6 +26,10 @@ export class CameraSystem {
   private middlePanActive = false
   private lastPanX = 0
   private lastPanY = 0
+  private mouseScreenX = 0
+  private mouseScreenY = 0
+  private mouseWorldX = 0
+  private mouseWorldY = 0
   private debugCross?: Phaser.GameObjects.Graphics
 
   constructor(scene: Phaser.Scene, adapter: LocalAdapter) {
@@ -62,18 +66,24 @@ export class CameraSystem {
     this.debugCross.lineBetween(cx - 12, cy, cx + 12, cy)
     this.debugCross.lineBetween(cx, cy - 12, cx, cy + 12)
 
+    // Track mouse world position on every move so we have a stable value for zoom
+    this.scene.input.on('pointermove', (ptr: Phaser.Input.Pointer) => {
+      this.mouseScreenX = ptr.x
+      this.mouseScreenY = ptr.y
+      this.mouseWorldX = cam.scrollX + ptr.x / cam.zoom
+      this.mouseWorldY = cam.scrollY + ptr.y / cam.zoom
+    })
+
     // Scroll wheel zoom — zoom toward mouse pointer
-    this.scene.input.on('wheel', (ptr: Phaser.Input.Pointer, _objs: unknown, _dx: number, dy: number) => {
+    this.scene.input.on('wheel', (_ptr: Phaser.Input.Pointer, _objs: unknown, _dx: number, dy: number) => {
       const newZoom = Phaser.Math.Clamp(cam.zoom - Math.sign(dy) * ZOOM_STEP, MIN_ZOOM, MAX_ZOOM)
       if (newZoom === cam.zoom) return
-      const worldX = ptr.worldX  // capture BEFORE zoom changes the value
-      const worldY = ptr.worldY
       cam.setZoom(newZoom)
-      cam.scrollX = worldX - ptr.x / newZoom
-      cam.scrollY = worldY - ptr.y / newZoom
+      cam.scrollX = this.mouseWorldX - this.mouseScreenX / newZoom
+      cam.scrollY = this.mouseWorldY - this.mouseScreenY / newZoom
       const centerX = cam.scrollX + cam.width  / (2 * cam.zoom)
       const centerY = cam.scrollY + cam.height / (2 * cam.zoom)
-      console.log(`[zoom] ptr=(${ptr.x.toFixed(0)},${ptr.y.toFixed(0)}) world=(${ptr.worldX.toFixed(0)},${ptr.worldY.toFixed(0)}) center=(${centerX.toFixed(0)},${centerY.toFixed(0)}) zoom=${cam.zoom.toFixed(2)}`)
+      console.log(`[zoom] screen=(${this.mouseScreenX.toFixed(0)},${this.mouseScreenY.toFixed(0)}) world=(${this.mouseWorldX.toFixed(0)},${this.mouseWorldY.toFixed(0)}) center=(${centerX.toFixed(0)},${centerY.toFixed(0)}) zoom=${cam.zoom.toFixed(2)}`)
     })
 
     // Middle-click pan: start on button down