diff --git a/A00_Common/touch_bridge.ts b/A00_Common/touch_bridge.ts
index 3b09d9a04..6c83aa700 100644
--- a/A00_Common/touch_bridge.ts
+++ b/A00_Common/touch_bridge.ts
@@ -26,6 +26,11 @@ const synthetic = new WeakSet<Event>();
 /** 손가락 벌림으로 만든 휠인지 — 「당기면 확대」 화면이 방향을 맞출 때 씀 */
 export const isPinchWheel = (e: Event): boolean => synthetic.has(e);
 
+let contactPx = 0;
+
+/** 고름 반경(px) — 손가락으로 눌렀으면 접촉 크기만큼(최소 24px) · 마우스 · 펜은 그대로(기기대응 4-4) */
+export const pickPx = (px: number): number => (contactPx ? Math.max(px, contactPx) : px);
+
 /** 「당기면 확대」 휠 화면(B04 · B05 지도)의 확대 판정 — 손가락 벌림은 거꾸로라 뒤집음 */
 export const wheelZoomsIn = (e: WheelEvent): boolean =>
   isPinchWheel(e) ? e.deltaY < 0 : e.deltaY > 0;
@@ -114,6 +119,7 @@ function hintOnce(target: Element): void {
 }
 
 function onDown(e: PointerEvent): void {
+  contactPx = e.pointerType === "touch" ? Math.max(24, e.width / 2, e.height / 2) : 0;
   if (e.pointerType !== "touch") return;
   const p = { x: e.clientX, y: e.clientY };
   touches.set(e.pointerId, p);
@@ -223,4 +229,4 @@ function listen(): void {
 }
 
 // 브라우저에서만(노드 시험이 이 모듈을 거쳐 불러도 됨)
-if (typeof window !== "undefined") listen();
+if (typeof window !== "undefined" && typeof window.addEventListener === "function") listen();
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts b/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts
index 864188844..12a99a0d6 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Pipes.ts
@@ -1,4 +1,5 @@
 import { themeColor } from "@ui/ui_template_palette";
+import { pickPx } from "../A00_Common/touch_bridge";
 import type { VWorldMeta } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 import type { ViewState } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
 import { snapStructureStation } from "../common_util/common_util_structure_station";
@@ -196,7 +197,7 @@ export function createPipeEditor(
         if (!xy) continue;
         const screen = metricToScreen(view, xy.x, xy.y);
         if (!screen) continue;
-        if (Math.hypot(screenX - screen.x, screenY - screen.y) <= HIT_RADIUS_PX) return i;
+        if (Math.hypot(screenX - screen.x, screenY - screen.y) <= pickPx(HIT_RADIUS_PX)) return i;
       }
       return null;
     },
@@ -221,20 +222,20 @@ export function createPipeEditor(
       const metric = screenToMetric(view, screenX, screenY);
       if (!metric) return false;
       const nearest = nearestChainage(metric.x, metric.y);
-      return !!nearest && nearest.distance * pxPerMeter(view) <= ADD_SNAP_PX;
+      return !!nearest && nearest.distance * pxPerMeter(view) <= pickPx(ADD_SNAP_PX);
     },
     chainageAt(view, screenX, screenY) {
       const metric = screenToMetric(view, screenX, screenY);
       if (!metric) return null;
       const nearest = nearestChainage(metric.x, metric.y);
-      if (!nearest || nearest.distance * pxPerMeter(view) > ADD_SNAP_PX) return null;
+      if (!nearest || nearest.distance * pxPerMeter(view) > pickPx(ADD_SNAP_PX)) return null;
       return onRoute(nearest.chainage);
     },
     addAt(view, screenX, screenY) {
       const metric = screenToMetric(view, screenX, screenY);
       if (!metric) return false;
       const nearest = nearestChainage(metric.x, metric.y);
-      if (!nearest || nearest.distance * pxPerMeter(view) > ADD_SNAP_PX) return false;
+      if (!nearest || nearest.distance * pxPerMeter(view) > pickPx(ADD_SNAP_PX)) return false;
       const at = onRoute(nearest.chainage);
       pipeList.push({ chainage_m: at, reason: "confirmed" });
       sortPipes();
@@ -253,7 +254,7 @@ export function createPipeEditor(
         if (!xy) continue;
         const screen = metricToScreen(view, xy.x, xy.y);
         if (!screen) continue;
-        if (Math.hypot(screenX - screen.x, screenY - screen.y) <= HIT_RADIUS_PX) {
+        if (Math.hypot(screenX - screen.x, screenY - screen.y) <= pickPx(HIT_RADIUS_PX)) {
           selectedIndex = i;
           draggingIndex = i;
           dragFrom = pipeList[i].chainage_m;
diff --git a/B05_Profile/B05_Profile_UI_Profile_Structures.ts b/B05_Profile/B05_Profile_UI_Profile_Structures.ts
index 0ff9bc61a..1a6c3bc4d 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Structures.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Structures.ts
@@ -9,6 +9,7 @@
  * 함께 다시 나뉜다 — 값을 두 곳에 따로 쌓지 않기 위해서다.
  * ========================================================================== */
 
+import { pickPx } from "../A00_Common/touch_bridge";
 import { createMapContextMenu, type MapContextMenuItem } from "@ui/ui_template_context_menu";
 import {
   irregularStationId,
@@ -91,7 +92,7 @@ export function mountStructureMenu(host: HTMLElement, options: StructureLineOpti
     // 선을 그리지 않으므로 화면 거리로 가장 가까운 구조물을 찾는다.
     const near = options.stations
       .map((station) => ({ station, distance: Math.abs(options.x(station.chainage_m) - localX) }))
-      .filter((entry) => entry.distance <= GRAB_SLACK_PX)
+      .filter((entry) => entry.distance <= pickPx(GRAB_SLACK_PX))
       .sort((left, right) => left.distance - right.distance)[0];
     event.preventDefault();
     const at = Number(chainage.toFixed(2));
diff --git a/B05_Profile/B05_Profile_UI_RouteEdit_Input.ts b/B05_Profile/B05_Profile_UI_RouteEdit_Input.ts
index 2e3b6198d..fbef8b083 100644
--- a/B05_Profile/B05_Profile_UI_RouteEdit_Input.ts
+++ b/B05_Profile/B05_Profile_UI_RouteEdit_Input.ts
@@ -13,7 +13,7 @@
  * 있어 좌상단 기준으로 셈하면 확대할수록 커서 아래 지점이 밀린다(옛 모달의 버그).
  * ========================================================================== */
 
-import { wheelZoomsIn } from "../A00_Common/touch_bridge";
+import { pickPx, wheelZoomsIn } from "../A00_Common/touch_bridge";
 import { computeMaxScale, type ViewState } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
 import type { VWorldMeta } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 import type { StationLabelBox } from "../B04_PreProcess/B04_PreProcess_UI_MapOverlays";
@@ -211,7 +211,7 @@ export function arcAtScreen(
   toScreen: ScreenOf,
   px: number,
   py: number,
-  hitPx: number = ARC_HIT_PX,
+  hitPx: number = pickPx(ARC_HIT_PX),
 ): number {
   let best = -1;
   let bestDistance = hitPx;
diff --git a/B05_Profile/B05_Profile_UI_RouteEdit_Measure.ts b/B05_Profile/B05_Profile_UI_RouteEdit_Measure.ts
index 1a6a39ec6..98cda38de 100644
--- a/B05_Profile/B05_Profile_UI_RouteEdit_Measure.ts
+++ b/B05_Profile/B05_Profile_UI_RouteEdit_Measure.ts
@@ -16,6 +16,7 @@
  * 둘째 점을 누르면 전처럼 두 점만 다시 물어 그 값으로 고정한다.
  * ========================================================================== */
 
+import { pickPx } from "../A00_Common/touch_bridge";
 import { fetchRouteElevations } from "./B05_Profile_Api_Replan";
 import { routePointAtScreen, type RoutePointHit } from "./B05_Profile_UI_RouteEdit_Input";
 import { stationLabel as formatStation } from "../common_util/common_util_station";
@@ -275,7 +276,13 @@ export function createMeasureTool(params: MeasureToolParams): MeasureTool {
       picked.length === 1 ? [picked[0].line] : ["planned", "expected"];
     const hits = candidates
       .map((line) => {
-        const hit = routePointAtScreen(lines[line], params.toScreen, px, py, MEASURE_HIT_PX);
+        const hit = routePointAtScreen(
+          lines[line],
+          params.toScreen,
+          px,
+          py,
+          pickPx(MEASURE_HIT_PX),
+        );
         if (!hit) return null;
         const [sx, sy] = params.toScreen(hit.point);
         return { ...hit, line, distance: Math.hypot(sx - px, sy - py) };
diff --git a/B05_Profile/B05_Profile_UI_RouteEdit_Pointer.ts b/B05_Profile/B05_Profile_UI_RouteEdit_Pointer.ts
index ac87885c4..3763161ea 100644
--- a/B05_Profile/B05_Profile_UI_RouteEdit_Pointer.ts
+++ b/B05_Profile/B05_Profile_UI_RouteEdit_Pointer.ts
@@ -8,6 +8,7 @@
  * 그대로 건네받아 **제자리에서** 고친다(되돌리기 사진첩이 같은 배열을 본다).
  * ========================================================================== */
 
+import { pickPx } from "../A00_Common/touch_bridge";
 import { hitPreparedLayer, type ViewState } from "../B04_PreProcess/B04_PreProcess_UI_MapRender";
 import type { RouteEditContours } from "./B05_Profile_UI_RouteEdit_Contour";
 import {
@@ -112,13 +113,13 @@ export function bindRouteEditPointer(params: RouteEditPointerParams): RouteEditP
       toScreen,
       px,
       py,
-      NODE_HIT_PX + 2,
+      pickPx(NODE_HIT_PX) + 2,
     );
   };
   const nodeAt = (px: number, py: number): number =>
-    nodeAtScreen(params.state().planned, toScreen, px, py, NODE_HIT_PX);
+    nodeAtScreen(params.state().planned, toScreen, px, py, pickPx(NODE_HIT_PX));
   const segmentAt = (px: number, py: number): number =>
-    segmentAtScreen(params.state().planned, toScreen, px, py, SEGMENT_HIT_PX);
+    segmentAtScreen(params.state().planned, toScreen, px, py, pickPx(SEGMENT_HIT_PX));
 
   /** 끈 접선점으로 새 교각점·새 반지름을 구한다 — 셈은 `_RouteEdit_Curve` 몫. */
   function dragHandleTo(
@@ -191,7 +192,7 @@ export function bindRouteEditPointer(params: RouteEditPointerParams): RouteEditP
           params.stationIntervalM,
           px,
           py,
-          STATION_HIT_PX,
+          pickPx(STATION_HIT_PX),
           stationLabelBoxes(canvas),
         );
         if (chainage === null) return false;
@@ -221,7 +222,7 @@ export function bindRouteEditPointer(params: RouteEditPointerParams): RouteEditP
         state.view,
         px,
         py,
-        CONTOUR_HIT_PX,
+        pickPx(CONTOUR_HIT_PX),
         params.contourStepM(),
       );
       if (hit !== state.pickedContour) {
diff --git a/B05_Profile/B05_Profile_UI_Structures_Marks.ts b/B05_Profile/B05_Profile_UI_Structures_Marks.ts
index 9f883cc85..42f64a4a4 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Marks.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Marks.ts
@@ -14,6 +14,7 @@
  * 그래프는 매 그리기마다 새로 만들어지므로 이 레인도 그때마다 다시 붙인다.
  * ========================================================================== */
 
+import { pickPx } from "../A00_Common/touch_bridge";
 import {
   structureAnchorM,
   type StructureInstance,
@@ -319,7 +320,7 @@ function attachMarkDrag(
     maxOffsetPx = Math.max(maxOffsetPx, Math.abs(event.clientX - startX));
     // 여유를 벗어나기 전에는 시각적으로도 움직이지 않는다 — 클릭 중 마크가 흔들리면
     // 이동으로 오해하기 쉽다(2026-08-19 민감도 완화).
-    if (maxOffsetPx <= GRAB_SLACK_PX) return;
+    if (maxOffsetPx <= pickPx(GRAB_SLACK_PX)) return;
     const lane = mark.parentElement;
     if (!lane) return;
     const localX = event.clientX - lane.getBoundingClientRect().left;
@@ -331,7 +332,7 @@ function attachMarkDrag(
     dragging = false;
     mark.releasePointerCapture(event.pointerId);
     // 여유 안에서 뗐으면 이동이 아니라 클릭이다 — 고르려다 옮겨지면 곤란하다.
-    if (maxOffsetPx <= GRAB_SLACK_PX) return;
+    if (maxOffsetPx <= pickPx(GRAB_SLACK_PX)) return;
     const lane = mark.parentElement;
     if (!lane) return;
     const localX = event.clientX - lane.getBoundingClientRect().left;
diff --git a/B06_Section/B06_Section_UI_Cross_Detail_Select.ts b/B06_Section/B06_Section_UI_Cross_Detail_Select.ts
index 16b25c7a7..a94566b48 100644
--- a/B06_Section/B06_Section_UI_Cross_Detail_Select.ts
+++ b/B06_Section/B06_Section_UI_Cross_Detail_Select.ts
@@ -13,6 +13,7 @@
  * ponytail: 그림을 다시 그리면(칸 크기 · 카드 다시 그림) 고름을 지움 — 조각 키 기억은 필요할 때.
  * ========================================================================== */
 
+import { pickPx } from "../A00_Common/touch_bridge";
 import type { CrossDesign, CrossPickPiece } from "./B06_Section_Api_Types";
 import type { CrossAxesOptions } from "./B06_Section_UI_Cross_Axes";
 import { CROSS_PAD } from "./B06_Section_UI_Section_Common";
@@ -294,7 +295,7 @@ export function pickAt(
     .sort((a, b) => areas[a] - areas[b])[0];
   if (
     paths.length &&
-    gaps[nearest] <= LINE_PICK_PX &&
+    gaps[nearest] <= pickPx(LINE_PICK_PX) &&
     (face === undefined || gaps[nearest] * 2 <= across)
   )
     return { piece: nearest };
diff --git a/resources/tester/helper_165_pavement_flow.cjs b/resources/tester/helper_165_pavement_flow.cjs
index 9da73a054..156a2845b 100644
--- a/resources/tester/helper_165_pavement_flow.cjs
+++ b/resources/tester/helper_165_pavement_flow.cjs
@@ -167,6 +167,7 @@ const panelModule = loadTs(
     "../B05_Profile/B05_Profile_UI_Profile_Structures": loadTs(
       path.join(ROOT, "B05_Profile", "B05_Profile_UI_Profile_Structures.ts"),
       {
+        "../A00_Common/touch_bridge": { pickPx: (px) => px }, // 기기대응 4-4 — 마우스 반경 그대로
         "@ui/ui_template_context_menu": { createMapContextMenu() {} },
         "./B05_Profile_UI_IrregularStations": {
           irregularStationId: (id) => `irregular:${id}`,
diff --git a/resources/tester/helper_231_1_pave_reload.cjs b/resources/tester/helper_231_1_pave_reload.cjs
index 749a362d8..821a57de2 100644
--- a/resources/tester/helper_231_1_pave_reload.cjs
+++ b/resources/tester/helper_231_1_pave_reload.cjs
@@ -186,6 +186,7 @@ const panelModule = loadTs(
     "../B05_Profile/B05_Profile_UI_Profile_Structures": loadTs(
       path.join(ROOT, "B05_Profile", "B05_Profile_UI_Profile_Structures.ts"),
       {
+        "../A00_Common/touch_bridge": { pickPx: (px) => px }, // 기기대응 4-4 — 마우스 반경 그대로
         "@ui/ui_template_context_menu": { createMapContextMenu() {} },
         "./B05_Profile_UI_IrregularStations": {
           irregularStationId: (id) => `irregular:${id}`,
diff --git a/resources/tester/helper_234_1_structure_station.cjs b/resources/tester/helper_234_1_structure_station.cjs
index 87fff283b..865900800 100644
--- a/resources/tester/helper_234_1_structure_station.cjs
+++ b/resources/tester/helper_234_1_structure_station.cjs
@@ -172,6 +172,7 @@ Promise.resolve(
 
     // ⑤ 배수유역도 관 지점 — 옮김 · 우클릭 추가 = 정수 m
     const pipesEditor = loadTs("B05_Profile/B05_Profile_UI_Drainage_Pipes.ts", {
+      "../A00_Common/touch_bridge": { pickPx: (px) => px }, // 기기대응 4-4 — 마우스 반경 그대로
       "@ui/ui_template_palette": { themeColor: () => "#000" },
       "../common_util/common_util_structure_station": station,
     });
diff --git a/resources/tester/helper_284_1_pill_pick.cjs b/resources/tester/helper_284_1_pill_pick.cjs
index 1b7dd660f..42d219a92 100644
--- a/resources/tester/helper_284_1_pill_pick.cjs
+++ b/resources/tester/helper_284_1_pill_pick.cjs
@@ -26,6 +26,7 @@ const selection = loadTs(path.join(ROOT, "A00_Common", "design", "design_selecti
 });
 const PREFIX = "irregular:";
 const rule = loadTs(path.join(ROOT, "B05_Profile", "B05_Profile_UI_Profile_Structures.ts"), {
+  "../A00_Common/touch_bridge": { pickPx: (px) => px }, // 기기대응 4-4 — 마우스 반경 그대로
   "@ui/ui_template_context_menu": { createMapContextMenu() {} },
   "./B05_Profile_UI_IrregularStations": {
     irregularStationId: (id) => `${PREFIX}${id}`,
diff --git a/resources/tester/test_touch_bridge.py b/resources/tester/test_touch_bridge.py
index ef4365988..a56c75620 100644
--- a/resources/tester/test_touch_bridge.py
+++ b/resources/tester/test_touch_bridge.py
@@ -4,6 +4,7 @@ sub1 화면 서버(5174) 첫 화면을 터치 기기로 열고 시험용 상자
 ① 길게 누름 → contextmenu 한 번 · 뒤따르는 click 없음 ② 짧은 톡 → contextmenu 없음
 ③ 두 번 톡 → dblclick 한 번 ④ 두 손가락 벌림 → Ctrl+휠(deltaY < 0) · 오므림 → deltaY > 0
 ⑤ [data-touch-own] 상자는 번역 안 함 ⑥ 마우스 우클릭 · 더블클릭은 그대로(번역이 끼지 않음)
+⑦ 고름 반경 `pickPx` — 손가락이면 24px 이상 · 마우스면 그대로
 """
 
 import json
@@ -127,6 +128,20 @@ def test_touch_bridge_translates_finger_gestures():
         names, raw = pinch(310, 20, 70)
         assert not [e for e in raw if not e["trusted"] and e["id"] == "tb-own"], raw
 
+        # ⑦ 고름 반경(4-4) — 손가락으로 누른 뒤 = 접촉 크기(최소 24) · 마우스로 누른 뒤 = 그대로
+        # 앱이 불러온 그 주소(vite 가 ?t= 를 붙였을 수 있음) — 다른 사본이면 상태가 따로
+        pick = (
+            "async () => (await import(performance.getEntriesByType('resource')"
+            ".map((e) => e.name).find((n) => n.includes('/touch_bridge.ts')))).pickPx(4)"
+        )
+        _touch(cdp, "touchStart", [(100, 200)])
+        _touch(cdp, "touchEnd", [])
+        assert page.evaluate(pick) >= 24
+        page.mouse.click(100, 400)
+        assert page.evaluate(pick) == 4
+        page.wait_for_timeout(400)
+        _log(page)
+
         # ⑥ 마우스 — 우클릭 · 더블클릭은 브라우저 것 하나씩만
         page.mouse.click(100, 200, button="right")
         page.mouse.dblclick(100, 200)