diff --git a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
index 8b0d6a17..0d2032d7 100644
--- a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
+++ b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
@@ -107,13 +107,14 @@ 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) {
+	public zoomScreen(deltaY: number, strength = 1) {
 		const worldMouseLocationBeforeZoom = this.getWorldMouseLocation();
 		const oldScreenScale = this.getScreenScale();
 
 		const newScreenScale =
-			oldScreenScale * (1 - MOUSE_ZOOM_MULTIPLIER * (deltaY / Math.abs(deltaY)));
+			oldScreenScale * (1 - MOUSE_ZOOM_MULTIPLIER * strength * (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 55c0592a..f5c8de0a 100644
--- a/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
+++ b/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
@@ -67,13 +67,25 @@ export class InputController {
 		canvas?.addEventListener('mousedown', (evt: MouseEvent) => this.handleMouseDown(evt));
 		canvas?.addEventListener('mousemove', (evt: MouseEvent) => this.handleMouseMove(evt));
 		canvas?.addEventListener('mouseup', (evt: MouseEvent) => this.handleMouseUp(evt));
-		canvas?.addEventListener('wheel', (evt: WheelEvent) => this.handleMouseWheel(evt));
+		// passive:false — 핀치·휠의 브라우저 기본 확대/스크롤을 막아야 한다.
+		canvas?.addEventListener('wheel', (evt: WheelEvent) => this.handleMouseWheel(evt), {
+			passive: false,
+		});
 		canvas?.addEventListener('mouseout', () => this.handleMouseOut());
 		canvas?.addEventListener('mouseenter', () => this.handleMouseEnter());
 		// Stop the context menu from appearing when right-clicking
 		canvas?.addEventListener('contextmenu', (evt) => {
 			evt.preventDefault();
 		});
+		// 캔버스 밖(리본·패널) 위에서의 트랙패드 핀치도 브라우저를 확대시키지 않는다.
+		// ctrl이 없는 휠은 그대로 둬서 패널 스크롤은 살린다.
+		document.addEventListener(
+			'wheel',
+			(evt: WheelEvent) => {
+				if (evt.ctrlKey) evt.preventDefault();
+			},
+			{ passive: false }
+		);
 	}
 
 	public draw(drawController: ScreenCanvasDrawController) {
@@ -214,13 +226,19 @@ export class InputController {
 	 * @param evt
 	 */
 	public handleMouseWheel(evt: WheelEvent) {
+		// 확대는 도면만 — 트랙패드 핀치(ctrl+휠)가 브라우저 전체를 키우던 것을 막는다.
+		evt.preventDefault();
 		if (Math.abs(evt.deltaY) === 0) {
 			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).
-		drawController.zoomScreen(-evt.deltaY);
+		drawController.zoomScreen(-evt.deltaY, strength);
 	}
 
 	public handleMouseDown(evt: MouseEvent) {