diff --git a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
index d72c03eb..8b0d6a17 100644
--- a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
+++ b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
@@ -69,6 +69,7 @@ export class ScreenCanvasDrawController implements DrawController {
 	}
 
 	public setScreenScale(newScreenScale: number) {
+		console.log(`set screen scale: ${newScreenScale}`);
 		this.screenScale = newScreenScale;
 		triggerReactUpdate(StateVariable.screenZoom);
 	}
@@ -106,14 +107,13 @@ export class ScreenCanvasDrawController implements DrawController {
 	 * This function takes the deltaY from the mouse wheel event and zooms the screen in or out
 	 * The location of the mouse in world space is preserved
 	 * @param deltaY
-	 * @param strength 한 번에 얼마나 확대할지(휠 한 칸 = 1). 트랙패드의 잔 델타용.
 	 */
-	public zoomScreen(deltaY: number, strength = 1) {
+	public zoomScreen(deltaY: number) {
 		const worldMouseLocationBeforeZoom = this.getWorldMouseLocation();
 		const oldScreenScale = this.getScreenScale();
 
 		const newScreenScale =
-			oldScreenScale * (1 - MOUSE_ZOOM_MULTIPLIER * strength * (deltaY / Math.abs(deltaY)));
+			oldScreenScale * (1 - MOUSE_ZOOM_MULTIPLIER * (deltaY / Math.abs(deltaY)));
 		this.setScreenScale(newScreenScale);
 
 		// now get the location of the cursor in world space again
diff --git a/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts b/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
index 4f1c37af..4dad90a8 100644
--- a/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
+++ b/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
@@ -232,14 +232,9 @@ export class InputController {
 			return; // We can't zoom by zero delta
 		}
 		const drawController = getScreenCanvasDrawController();
-		// 휠 한 칸(deltaY 100, 줄 단위면 3)을 세기 1로 본다. 트랙패드는 잔 델타를
-		// 초당 수십 번 보내므로 세기를 델타에 비례시켜야 한 번에 튀지 않는다.
-		const notch = evt.deltaMode === 0 ? 100 : 3;
-		const strength = Math.min(1, Math.max(0.12, Math.abs(evt.deltaY) / notch));
 		// Aislo: wheel direction is inverted on purpose - pulling the wheel zooms in, pushing
 		// zooms out, matching the B04/B05 maps and the B06 cross sections (2026-08-02).
-		// 다만 트랙패드 핀치(ctrl+휠)는 OS 관행대로 — 손가락을 벌리면 커진다.
-		drawController.zoomScreen(evt.ctrlKey ? evt.deltaY : -evt.deltaY, strength);
+		drawController.zoomScreen(-evt.deltaY);
 	}
 
 	public handleMouseDown(evt: MouseEvent) {