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+# SW 뷰어 모드 상단 메뉴·팝업 (2026-10-19)
+
+- 작업 위치: worktree `D:\디자인시스템\HMDesign-SW-Viewer`, 브랜치 `feature/sw-viewer-header`(기준 `feature/sw-package` e8409ef). Task A+B 통합 worktree(`HMDesign-SW-Integration`)는 변경하지 않았습니다. Commit·Push 없음.
+- 범위(사용자 확정): HMDesign Storybook 데모 기준. 실제 SW 프로그램 연결과 DWG/DXF 기능은 제외했습니다. 참고 프로젝트 `D:\디자인시스템\테스트\dwg-dxf-viewer-hm`은 읽기만 했고, 최신 소스는 scratchpad로 빌드해 `vite preview`로 띄웠습니다(참고 폴더에 쓰기 없음).
+- 추가 요청 반영: ① Viewer Header 텍스트·아이콘에 SW Header와 같은 검정 외곽선 ② Storybook `Tool Popup` 메뉴 정리: `SW/Tool` 삭제. `SW/Popup`은 공통 `SWPopup` 예시이므로 Commit 승인 시 지시에 따라 복원·유지 ③ 로고 미제공 시 `HM` 등 아무것도 표시하지 않음.
+- 증거: `docs/sw/viewer-qa/`(같은 해상도 캡처, `report.json` 74항목), `docs/sw/viewer-qa/regression/regression.json`(기존 SW Header 33장 픽셀 비교).
+
+## A. 분석 결과
+
+**참고 뷰어 상단 메뉴**(`Toolbar.tsx`, `sw-header.css` — `@hm-design/ui` SWHeader 조합, 1440px 실측)
+- 52px Header(그라디언트 #266651 → #123328 → #0A221D, 1px #071E18 테두리), 72px 사선 로고 면(HM), 파일명 면 `clamp(220px, 25vw, 360px)`, 객체 수정 면(반경 6, 테두리 #135643).
+- 그룹: 파일(파일 열기 109×34, 샘플▾ 80×34) / 도면 공간 field 면(Model·Layout 탭 97·87×40, 개수 11px) / 화면 보기 field 면(전체 보기, 2.5D·어두운 배경 스위치 칸 52·70×40) / 오른쪽 끝(레이어·설정·속성 토글 81·68·68×40, 상태 11px, 정보 32×40).
+- 상태: Hover = #266651 면, On·Open·선택 탭 = #FFC600 글자, Disabled = 60%, 스위치 off #0A221D / on #FFC600.
+- 반응형: 1180px 미만 = 샘플·탭·스위치가 더보기(베이지 #F5F0E5, 260px)로, 900px 미만 = 패널 토글도 더보기로, 560px 미만 = 아이콘만 표시하고 상태 글자 숨김.
+
+**참고 팝업·설정창**
+- 샘플 Dropdown(흰 면, #DEDBD2 테두리, 반경 4, 항목 36px, 강조 rgba(189,223,212,.45))과 더보기 Dropdown(라벨, 체크, 라디오 구획).
+- DraggablePanel 3종(레이어 320×420, 옵션 340×520, 속성 320×420): 베이지 #E0DACE, 2px #897445, 제목 막대 #221D13·#FFC600 700, 곡선 녹색 닫기(Hover #E40000), 접기, 드래그(경계 10px), 네이티브 resize, 본문 12px 패딩, 카드 섹션 #F5F0E5.
+- 라이선스 모달 Dialog.
+- Context Menu와 다단계 서브메뉴는 참고 뷰어에 **없습니다**. 요청에 따라 공통 Dropdown 기능으로 추가했습니다.
+
+**기존 SW 패키지와의 차이**
+- 기존 `SWHeader`는 Figma 26:8944 기준(49px, 고정 필드 구성)입니다. 데이터 기반 메뉴, 탭, 스위치, 드래그 패널이 없습니다.
+- `SWPopup`은 314px 고정 Figma 속성창 프레임으로, 이동·크기 조절·접기를 지원하지 않습니다.
+- 재사용: 사용자 확정 면 토큰 3종(`--hm-sw-header-document-*`, `object-*`, `property-*`, 참고 뷰어와 같은 값), SW 외곽선 토큰(`--hm-sw-header-text-outline`, `label-outline`, `text-outline-room`), `SWTheme` 범위·버튼 초기화, `SWHeader` 로고 Props 규칙.
+
+**분류**
+
+| 항목 | 분류 | 근거 |
+|---|---|---|
+| 일반 모드 Header | 재사용(변경 없음) | `SWHeader` |
+| 면 배경·외곽선·글꼴 | 재사용 | 기존 토큰 |
+| 뷰어 Header | 신규 | 기존 SWHeader는 Figma 고정 구성이고, 뷰어 메뉴 구조·크기가 다름 |
+| Dropdown·서브메뉴·Context | 신규 | SW 패키지에 범용 Dropdown 없음(필드 전용 Dropdown만 있음) |
+| 뷰어 팝업 | 신규 | `SWPopup` 프레임(314px Figma art)과 외형·동작이 다름. Variant로 만들면 기존 속성창 DOM·CSS를 바꿔야 해서 분리 |
+
+## B. 패키지 변경 결과
+
+**신규 파일**
+- `packages/sw/src/components/sw-viewer/`: `types.ts`, `SWViewerHeader.tsx`, `SWViewerMenu.tsx`, `SWViewerPanel.tsx`, `SWViewerControls.tsx`, `index.ts`
+- `packages/sw/src/theme/sw-viewer.css`
+- `packages/sw/ai/VIEWER.md`, `packages/sw/ai/examples/ExampleH-ViewerMode.tsx`
+- `packages/sw/tests/viewer.browser.mjs`, `viewer-regression.browser.mjs`
+
+**수정 파일**
+- `packages/sw/src/index.ts`: 끝에 Export 1블록
+- `packages/sw/ai/AI_USAGE.md`: 문서 표 1행
+- `packages/sw/tests/storybook-inventory.mjs`: 삭제한 Story id 기록
+
+기존 컴포넌트·`sw.css`·`SWHeaderPropertyPanel.tsx`는 수정하지 않았습니다. A+B 통합 작업과 충돌 가능성이 있는 곳은 `index.ts`·`AI_USAGE.md` 각 1군데뿐입니다.
+
+**공개 API**(`@hm-design/sw`)
+- `SWViewerHeader`: `groups`·`trailing`·`onCommand`·`documentTitle`·`logo`/`logoSrc`/`logoAlt`/`onHomeClick`
+- `SWViewerHeaderButton`
+- `SWViewerMenu`: `entries`·`anchorRef`/`anchorPoint`·`surface`·`initialFocus`
+- `SWViewerPanel`: `children`·`footer`·`headerActions`·크기·위치·`strategy`·드래그·크기 조절·접기·`modal`
+- 패널 콘텐츠: `SWViewerSection`, `SWViewerField`, `SWViewerHint`, `SWViewerSwitch`, `SWViewerSlider`, `SWViewerInput`, `SWViewerButton`, `SWViewerBadge`, `SWViewerStatus`
+- 타입: `SWViewerHeaderItem`, `SWViewerHeaderGroup`, `SWViewerMenuEntry`, `SWViewerCommand`, `SWViewerPanelPlacement` 및 각 Props
+
+**외곽선**(SW Header 분석 → 같은 기준 적용)
+- 텍스트: SW Header는 14px 글자에 검정 1.3px(16 text-shadow), 12px 라벨에 1px을 씁니다. 뷰어의 14px 글자(파일명·버튼·탭·로고)는 `--hm-sw-header-text-outline`, 11px(스위치 캡션·개수·상태)는 `--hm-sw-header-label-outline`을 그대로 사용합니다. 말줄임 파일명에는 `overflow-clip-margin`을 적용했습니다.
+- 아이콘: SW Header 아이콘 자산(print·K·레이어)은 채움 + 1px 검정 바깥 Stroke(Figma mask outside) + glow(stdDeviation 1.615, #061A14)입니다. 프로그램 아이콘은 자유 SVG라서 같은 효과를 `drop-shadow` 체인(1px × 4방향 + glow)으로 재현합니다. 토큰 `--hm-sw-viewer-icon-outline`이며 아이콘 윤곽을 따라갑니다.
+- 색·크기·굵기·간격은 유지합니다. Hover·Active는 채움 색만 바뀌고, Disabled는 버튼 전체 opacity로 함께 흐려집니다. Dropdown과 패널에는 외곽선이 없습니다(SW Header More 메뉴와 같음).
+
+**로고**
+- `SWHeader`와 같은 Props(`logo`, `logoSrc`, `logoAlt`, `onHomeClick`)를 씁니다.
+- 로고를 주지 않으면 사선 끝 24px만 남고 문자·아이콘은 없습니다.
+- 로고를 주면 72px 면이 되고, 로고가 더 넓으면 `24 + 로고 + 25`px입니다. Header 높이 52px와 메뉴 위치는 변하지 않습니다.
+
+**Storybook**
+- `SW/Viewer` 10개: Viewer Header(로고 없음 기본), Menu Groups, Item States, Header + Dropdown(서브메뉴·체크·라디오·Context Menu), Settings Popup(footer), Popup Content Variants, Variable Size Popups, Responsive Widths, SWHeader vs Viewer Header(모드 전환), Logo
+- 공개 API만 사용합니다. Story CSS는 배치와 Story 자체 목록에만 쓰고 `hm-sw-*`는 사용하지 않습니다.
+- `SW/Tool`(`sw-tool.stories.tsx`)만 삭제했습니다. `SW/Popup`(`sw-popup.stories.tsx`, 공통 `SWPopup` 예시)과 `sw-integrated-stories.css`는 원본 그대로 유지합니다. `SWToolButton`/`SWToolGroup`/`SWPopup`과 그 API도 유지합니다.
+- 삭제한 `sw-tool--tool-buttons`를 여는 기존 `integrated-improvement.browser.mjs`는 과거 검증 기록용으로만 남습니다. 지금 다시 실행하면 해당 단계가 실패합니다.
+
+**AI 지침**: `ai/VIEWER.md`(역할·사용 환경·Props·이벤트·Import·Viewer 적용 조건·콘텐츠 교체·외곽선·로고·주의사항·올바른 예/잘못된 예), 예제 H, `AI_USAGE.md` 문서 표 반영.
+
+## C. SW 프로그램 통합 결과
+
+이번 범위에서 제외(사용자 결정)했으므로 **NOT TESTED**입니다. Storybook `SWHeader vs Viewer Header`에서 Header 교체만 UI로 시연했고, 화면 상태(파일명·패널)는 유지됩니다.
+
+메뉴 명령은 모두 `onCommand` 로그로만 표시하며 실제 기능은 미연결입니다: 파일 열기, 전체 보기, 선택 확대, 인쇄, 내보내기, 측정.
+
+## D. 검증 결과
+
+| 항목 | 판정 | 근거 |
+|---|---|---|
+| Typecheck | PASS | `npm run typecheck`(전체 패키지 build + `tsc -b` + 5개 workspace) exit 0 |
+| Package Build | PASS | `build:packages` / `build:sw` 성공 |
+| Storybook Build | PASS | `npm run build-storybook` exit 0. CSS 경고 1건은 기존 docs의 `bg-[var(...)]` 문구(기존부터 있음) |
+| 공개 Export | PASS | `ai-docs.check.mjs` 25/25(문서 식별자·예제 Import·링크) |
+| 독립 소비 프로젝트 | PASS (일부) | `ai-template-consumer.mjs`: npm pack → 새 프로젝트 설치 → 예제 A~H `tsc` + `vite build` 통과. 예제 H의 브라우저 렌더링은 소비 프로젝트에서 미실행(Storybook에서만 확인) |
+| 실제 화면 비교 | PASS (알려진 차이 있음) | 1440×900 같은 해상도 캡처와 수치 비교. 버튼·토글·탭·스위치 칸 크기가 참고와 같음(px 단위). 도면 공간 field 면은 42px로 참고(41px)와 1px 차이. 원인은 참고 Tabs 루트 39px. 파일명 면 x는 로고 규칙 때문에 −48px(의도된 차이) |
+| 사용자 인터랙션 | PASS | `viewer.browser.mjs` 74/74 PASS (아래 항목 참조) |
+| 외곽선 | PASS | 텍스트 1.3px/1px 검정 각 16 shadow, 아이콘 drop-shadow 5개, 색·크기·굵기 유지, Hover·Disabled에서 유지, 3배 확대 캡처(`outline-*.png`) |
+| 로고 | PASS | 없음: 문자·이미지 0, 면 24px. logoSrc·logo 표시. 높이 52px, 메뉴 y 동일 |
+| `SW/Tool` 삭제·`SW/Popup` 유지 | PASS | dev `index.json`: SW 제목은 `SW/Header`, `SW/Popup`, `SW/Viewer` (`viewer.browser.mjs` 재실행) |
+| 기존 기능 회귀 | PASS | 기존 SW/Header Story 11개 × 3폭(1920/1180/768) 픽셀 차이 0(33/33). 비교 대상은 기준 Storybook(6024, e8409ef)과 이 브랜치. `test:components` 9/9, `test:guard` 94/94, `git diff --check` 통과 |
+| Window Move Motion Story | NOT TESTED | 애니메이션이라 픽셀 비교에서 제외 |
+| Firefox·Safari, 실제 창 크기 변경 | NOT TESTED | Chrome headless만 실행. 폭은 viewport와 Story 폭으로 재현 |
+
+`viewer.browser.mjs` 74개 항목: 메뉴 열기·위치·Enter/Arrow/Escape(Focus 복귀)·바깥 클릭, 탭 화살표, 스위치, Hover 면, 토글 → 팝업, 패널 Focus·Escape·Focus 복귀, 모서리 크기 조절, 드래그·경계 10px, 접기·더블클릭, 닫기 Hover #E40000, 앞으로 가져오기, 모달 배경·Focus Trap·Escape, 서브메뉴 →/← 3단계, 체크·라디오·비활성 항목, `menuAlign`·`menuWidth`, Context Menu 포인터 위치, 화면 경계, 1440/1100/860/520 가로 넘침 0, More 구획(샘플 도면/도면 공간/화면 보기/패널), More 체크·라디오 명령, 모드 전환과 상태 유지, 로고, 외곽선, 메뉴 삭제, 페이지 오류 0.
+
+**참고 뷰어와 의도적으로 다른 점**
+- 모서리 크기 조절: 네이티브 `resize` 대신 같은 위치의 Grip을 씁니다. Firefox 등 모든 브라우저에서 동작하고 자동 검증할 수 있습니다.
+- 패널 Escape 닫기를 추가했습니다(Focus가 패널 안에 있을 때).
+- 로고 기본 표시를 없앴습니다(사용자 결정).
+- 서브메뉴와 Context Menu를 추가했습니다(요청 범위).
+
+## E. 최종 판정
+
+**PARTIAL**: 패키지 컴포넌트 구현, Storybook, AI 지침, 주요 UI·인터랙션 검증은 끝났습니다. PASS가 아닌 이유는 요청 원문의 “SW 프로그램 뷰어 모드 통합”이 이번 범위에서 제외되어(사용자 결정) 진행하지 않았기 때문입니다. Commit·Push는 승인 대기입니다.
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diff --git a/docs/sw/viewer-qa/package-responsive-more-open.png b/docs/sw/viewer-qa/package-responsive-more-open.png
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index 0000000..1e4cefb
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diff --git a/docs/sw/viewer-qa/reference-1440-idle.png b/docs/sw/viewer-qa/reference-1440-idle.png
new file mode 100644
index 0000000..7f51570
Binary files /dev/null and b/docs/sw/viewer-qa/reference-1440-idle.png differ
diff --git a/docs/sw/viewer-qa/reference-1440-loaded.png b/docs/sw/viewer-qa/reference-1440-loaded.png
new file mode 100644
index 0000000..c1af8bd
Binary files /dev/null and b/docs/sw/viewer-qa/reference-1440-loaded.png differ
diff --git a/docs/sw/viewer-qa/reference-1440-panels.png b/docs/sw/viewer-qa/reference-1440-panels.png
new file mode 100644
index 0000000..21f03f6
Binary files /dev/null and b/docs/sw/viewer-qa/reference-1440-panels.png differ
diff --git a/docs/sw/viewer-qa/reference-1440-sample-menu.png b/docs/sw/viewer-qa/reference-1440-sample-menu.png
new file mode 100644
index 0000000..d210e6c
Binary files /dev/null and b/docs/sw/viewer-qa/reference-1440-sample-menu.png differ
diff --git a/docs/sw/viewer-qa/regression/regression.json b/docs/sw/viewer-qa/regression/regression.json
new file mode 100644
index 0000000..5b25aa3
--- /dev/null
+++ b/docs/sw/viewer-qa/regression/regression.json
@@ -0,0 +1,237 @@
+{
+  "base": "http://127.0.0.1:6024",
+  "next": "http://127.0.0.1:6034",
+  "results": [
+    {
+      "id": "overview",
+      "width": 1920,
+      "size": "1920x1000 / 1920x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "overview",
+      "width": 1180,
+      "size": "1180x1000 / 1180x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "overview",
+      "width": 768,
+      "size": "768x1000 / 768x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "interactive-states",
+      "width": 1920,
+      "size": "1920x2517 / 1920x2517",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "interactive-states",
+      "width": 1180,
+      "size": "1180x2527 / 1180x2527",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "interactive-states",
+      "width": 768,
+      "size": "768x2623 / 768x2623",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "logo-slot",
+      "width": 1920,
+      "size": "1920x1000 / 1920x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "logo-slot",
+      "width": 1180,
+      "size": "1180x1000 / 1180x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "logo-slot",
+      "width": 768,
+      "size": "768x1000 / 768x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "document-dropdown",
+      "width": 1920,
+      "size": "1920x9112 / 1920x9112",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "document-dropdown",
+      "width": 1180,
+      "size": "1180x9122 / 1180x9122",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "document-dropdown",
+      "width": 768,
+      "size": "768x9298 / 768x9298",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "responsive-more",
+      "width": 1920,
+      "size": "1920x10042 / 1920x10042",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "responsive-more",
+      "width": 1180,
+      "size": "1180x10052 / 1180x10052",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "responsive-more",
+      "width": 768,
+      "size": "768x10048 / 768x10048",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "k-guide",
+      "width": 1920,
+      "size": "1920x1037 / 1920x1037",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "k-guide",
+      "width": 1180,
+      "size": "1180x1028 / 1180x1028",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "k-guide",
+      "width": 768,
+      "size": "768x1023 / 768x1023",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "property-panel-compare",
+      "width": 1920,
+      "size": "1920x1000 / 1920x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "property-panel-compare",
+      "width": 1180,
+      "size": "1180x1000 / 1180x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "property-panel-compare",
+      "width": 768,
+      "size": "768x1000 / 768x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "composed-controls",
+      "width": 1920,
+      "size": "1920x1000 / 1920x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "composed-controls",
+      "width": 1180,
+      "size": "1180x1000 / 1180x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "composed-controls",
+      "width": 768,
+      "size": "768x1000 / 768x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "document-open",
+      "width": 1920,
+      "size": "1920x10771 / 1920x10771",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "document-open",
+      "width": 1180,
+      "size": "1180x10761 / 1180x10761",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "document-open",
+      "width": 768,
+      "size": "768x10797 / 768x10797",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "hidden-sub-controls",
+      "width": 1920,
+      "size": "1920x1710 / 1920x1710",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "hidden-sub-controls",
+      "width": 1180,
+      "size": "1180x1700 / 1180x1700",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "hidden-sub-controls",
+      "width": 768,
+      "size": "768x1676 / 768x1676",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "detail-buttons",
+      "width": 1920,
+      "size": "1920x1000 / 1920x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "detail-buttons",
+      "width": 1180,
+      "size": "1180x1000 / 1180x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    },
+    {
+      "id": "detail-buttons",
+      "width": 768,
+      "size": "768x1000 / 768x1000",
+      "diffPixels": 0,
+      "result": "PASS"
+    }
+  ]
+}
diff --git a/docs/sw/viewer-qa/report.json b/docs/sw/viewer-qa/report.json
new file mode 100644
index 0000000..ffa63c7
--- /dev/null
+++ b/docs/sw/viewer-qa/report.json
@@ -0,0 +1,621 @@
+{
+  "storybook": "http://127.0.0.1:6034",
+  "reference": "http://127.0.0.1:5182",
+  "comparison": {
+    "reference": {
+      "document": [
+        {
+          "x": 73,
+          "y": 1,
+          "w": 337,
+          "h": 50,
+          "text": "C0060202-001"
+        }
+      ],
+      "object": [
+        {
+          "x": 412,
+          "y": 1,
+          "w": 1027,
+          "h": 50,
+          "text": "파일 열기샘플 Mode"
+        }
+      ],
+      "field": [
+        {
+          "x": 622,
+          "y": 6,
+          "w": 197,
+          "h": 41,
+          "text": "Model17,377L"
+        },
+        {
+          "x": 823,
+          "y": 5,
+          "w": 249,
+          "h": 42,
+          "text": "전체 보기2.5D어두운"
+        }
+      ],
+      "button": [
+        {
+          "x": 421,
+          "y": 9,
+          "w": 109,
+          "h": 34,
+          "text": "파일 열기"
+        },
+        {
+          "x": 534,
+          "y": 9,
+          "w": 80,
+          "h": 34,
+          "text": "샘플"
+        },
+        {
+          "x": 828,
+          "y": 9,
+          "w": 109,
+          "h": 34,
+          "text": "전체 보기"
+        },
+        {
+          "x": 1402,
+          "y": 6,
+          "w": 32,
+          "h": 40,
+          "text": ""
+        }
+      ],
+      "toggle": [
+        {
+          "x": 1086,
+          "y": 6,
+          "w": 81,
+          "h": 40,
+          "text": "레이어"
+        },
+        {
+          "x": 1171,
+          "y": 6,
+          "w": 68,
+          "h": 40,
+          "text": "설정"
+        },
+        {
+          "x": 1243,
+          "y": 6,
+          "w": 68,
+          "h": 40,
+          "text": "속성"
+        }
+      ],
+      "tab": [
+        {
+          "x": 627,
+          "y": 7,
+          "w": 97,
+          "h": 40,
+          "text": "Model17,377"
+        },
+        {
+          "x": 728,
+          "y": 7,
+          "w": 87,
+          "h": 40,
+          "text": "Layout237"
+        }
+      ],
+      "switchField": [
+        {
+          "x": 942,
+          "y": 6,
+          "w": 52,
+          "h": 40,
+          "text": "2.5D"
+        },
+        {
+          "x": 998,
+          "y": 6,
+          "w": 70,
+          "h": 40,
+          "text": "어두운 배경"
+        }
+      ]
+    },
+    "package": {
+      "document": [
+        {
+          "x": 25,
+          "y": 1,
+          "w": 360,
+          "h": 50,
+          "text": "C0060202-001"
+        }
+      ],
+      "object": [
+        {
+          "x": 387,
+          "y": 1,
+          "w": 1053,
+          "h": 50,
+          "text": "파일 열기샘플Model"
+        }
+      ],
+      "field": [
+        {
+          "x": 597,
+          "y": 5,
+          "w": 197,
+          "h": 42,
+          "text": "Model17,377L"
+        },
+        {
+          "x": 798,
+          "y": 5,
+          "w": 249,
+          "h": 42,
+          "text": "전체 보기2.5D어두운"
+        }
+      ],
+      "button": [
+        {
+          "x": 396,
+          "y": 9,
+          "w": 109,
+          "h": 34,
+          "text": "파일 열기"
+        },
+        {
+          "x": 509,
+          "y": 9,
+          "w": 80,
+          "h": 34,
+          "text": "샘플"
+        },
+        {
+          "x": 803,
+          "y": 9,
+          "w": 109,
+          "h": 34,
+          "text": "전체 보기"
+        },
+        {
+          "x": 1402,
+          "y": 6,
+          "w": 32,
+          "h": 40,
+          "text": ""
+        }
+      ],
+      "toggle": [
+        {
+          "x": 1086,
+          "y": 6,
+          "w": 81,
+          "h": 40,
+          "text": "레이어"
+        },
+        {
+          "x": 1171,
+          "y": 6,
+          "w": 68,
+          "h": 40,
+          "text": "설정"
+        },
+        {
+          "x": 1243,
+          "y": 6,
+          "w": 68,
+          "h": 40,
+          "text": "속성"
+        }
+      ],
+      "tab": [
+        {
+          "x": 602,
+          "y": 6,
+          "w": 97,
+          "h": 40,
+          "text": "Model17,377"
+        },
+        {
+          "x": 702,
+          "y": 6,
+          "w": 87,
+          "h": 40,
+          "text": "Layout237"
+        }
+      ],
+      "switchField": [
+        {
+          "x": 916,
+          "y": 6,
+          "w": 52,
+          "h": 40,
+          "text": "2.5D"
+        },
+        {
+          "x": 972,
+          "y": 6,
+          "w": 70,
+          "h": 40,
+          "text": "어두운 배경"
+        }
+      ]
+    }
+  },
+  "results": [
+    {
+      "name": "geometry button sizes equal to reference",
+      "result": "PASS",
+      "detail": "reference 109x34 80x34 109x34 32x40 / package 109x34 80x34 109x34 32x40"
+    },
+    {
+      "name": "geometry toggle sizes equal to reference",
+      "result": "PASS",
+      "detail": "reference 81x40 68x40 68x40 / package 81x40 68x40 68x40"
+    },
+    {
+      "name": "geometry tab sizes equal to reference",
+      "result": "PASS",
+      "detail": "reference 97x40 87x40 / package 97x40 87x40"
+    },
+    {
+      "name": "geometry switchField sizes equal to reference",
+      "result": "PASS",
+      "detail": "reference 52x40 70x40 / package 52x40 70x40"
+    },
+    {
+      "name": "geometry field sizes equal to reference (±1px height, known)",
+      "result": "PASS",
+      "detail": "reference 197x41 249x42 / package 197x42 249x42"
+    },
+    {
+      "name": "geometry document well height / top (x: logo rule)",
+      "result": "PASS",
+      "detail": "reference x73 y1 h50 / package x25 y1 h50"
+    },
+    {
+      "name": "menu opens on click",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "menu has 3 entries",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "menu placed under its button",
+      "result": "PASS",
+      "detail": "menu 549,365 button 549,361"
+    },
+    {
+      "name": "trigger shows open state",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "ArrowDown moves focus in menu",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "Escape closes menu",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "Escape returns focus to trigger",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "Enter opens with first entry focused",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "Enter selects entry (document changes)",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "onCommand reports menu entry",
+      "result": "PASS",
+      "detail": "Command: samples/sample-dxf"
+    },
+    {
+      "name": "outside click closes menu",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "tabs ArrowRight selects Layout",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "header switch toggles",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "hover face #266651",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "toggle opens panel",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "toggle pressed state + #FFC600",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "panel focused on open",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "Escape closes panel",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "focus returns to toggle",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "corner resize changes size",
+      "result": "PASS",
+      "detail": "320x420 → 263x323"
+    },
+    {
+      "name": "drag moves panel",
+      "result": "PASS",
+      "detail": "dx -300 dy 30"
+    },
+    {
+      "name": "drag stays inside bounds (10px edge)",
+      "result": "PASS",
+      "detail": "right gap 10, bottom gap 10"
+    },
+    {
+      "name": "collapse hides body",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "title double click expands",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "panel content callback",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "close hover #E40000 / white X",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "close button closes",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "last touched panel on top",
+      "result": "PASS",
+      "detail": "layer z 37, options z 36"
+    },
+    {
+      "name": "modal popup opens with backdrop",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "modal focus stays inside",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "modal Escape closes",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "ArrowRight opens submenu with focus",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "submenu opens to the side",
+      "result": "PASS",
+      "detail": "parent right 596, sub left 596"
+    },
+    {
+      "name": "third level opens on hover",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "ArrowLeft closes one level",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "checkbox entry toggles via onCommand",
+      "result": "PASS",
+      "detail": "Command: file/lineweight=true"
+    },
+    {
+      "name": "checkbox state reflected",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "disabled entry does nothing",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "menuAlign end + menuWidth",
+      "result": "PASS",
+      "detail": "width 220"
+    },
+    {
+      "name": "context menu opens at pointer",
+      "result": "PASS",
+      "detail": "90,729"
+    },
+    {
+      "name": "context entry reported",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "menu stays inside the viewport",
+      "result": "PASS",
+      "detail": "left 4, right 224"
+    },
+    {
+      "name": "no horizontal overflow at 1440 / 1100 / 860 / 520",
+      "result": "PASS",
+      "detail": "[[1440,0,0],[1100,0,0],[860,0,0],[520,0,0]]"
+    },
+    {
+      "name": "1440: no More",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "1100: More, samples/tabs/switches moved",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "860: panel toggles moved too",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "520: 파일 열기 / 전체 보기 icon only",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "More sections like the reference",
+      "result": "PASS",
+      "detail": "샘플 도면 | 기본 도면 · DWG | 평면 및 종단면도 · DWG | 기본 도형 · DXF | 도면 공간 | Model · 17,377개 | Layout · 237개 | 화면 보기 | 2.5D | 어두운 배경 | 패널 | 레이어 | 설정 | 속성"
+    },
+    {
+      "name": "More face beige 260px",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "More checkbox reports command",
+      "result": "PASS",
+      "detail": "Command: layers=true"
+    },
+    {
+      "name": "More radio selects tab value",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "mode switch shows viewer header",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "brand click returns to normal SWHeader",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "state kept across mode switch (layer panel still open)",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "logo none: no HM / text / icon",
+      "result": "PASS",
+      "detail": "{\"text\":\"\",\"img\":false,\"width\":24,\"docX\":25,\"height\":52,\"fileOpenY\":9}"
+    },
+    {
+      "name": "logo none: cap shrinks to its edge (no wide gap)",
+      "result": "PASS",
+      "detail": "{\"text\":\"\",\"img\":false,\"width\":24,\"docX\":25,\"height\":52,\"fileOpenY\":9}"
+    },
+    {
+      "name": "logoSrc shows the image (cap = 24 + logo + 25, min 72)",
+      "result": "PASS",
+      "detail": "{\"text\":\"\",\"img\":true,\"width\":94,\"docX\":95,\"height\":52,\"fileOpenY\":9,\"logoWidth\":45}"
+    },
+    {
+      "name": "logo element shown",
+      "result": "PASS",
+      "detail": "{\"text\":\"LOGO\",\"img\":true,\"width\":81,\"docX\":82,\"height\":52,\"fileOpenY\":9}"
+    },
+    {
+      "name": "header height and menu row unchanged with / without logo",
+      "result": "PASS",
+      "detail": "52/9 52/9 52/9"
+    },
+    {
+      "name": "text outline 1.3px black on 14px text (label / file name / tab)",
+      "result": "PASS",
+      "detail": "rgb(0, 0, 0) 1.3px 0px 0px, rgb(0, 0, 0) 1.2px 0.5px 0px, rg"
+    },
+    {
+      "name": "label outline 1px black on 11px captions / counts",
+      "result": "PASS",
+      "detail": "rgb(0, 0, 0) 1px 0px 0px, rgb(0, 0, 0) 0.92px 0.38px 0px, rg"
+    },
+    {
+      "name": "icon outline: 4 x 1px black drop-shadows + #061A14 glow",
+      "result": "PASS",
+      "detail": "drop-shadow(rgb(0, 0, 0) 1px 0px 0px) drop-shadow(rgb(0, 0, 0) -1px 0px 0px) drop-shadow(r"
+    },
+    {
+      "name": "fill / size / weight / spacing kept",
+      "result": "PASS",
+      "detail": "rgb(255, 255, 255) 14px 500 normal"
+    },
+    {
+      "name": "hover changes fill only (outline kept)",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "disabled fades text + outline together",
+      "result": "PASS",
+      "detail": "[\"0.6\",true]"
+    },
+    {
+      "name": "SW/Tool removed from the sidebar",
+      "result": "PASS",
+      "detail": "SW/Header, SW/Viewer, SW/Popup"
+    },
+    {
+      "name": "SW/Popup, SW/Header and SW/Viewer remain",
+      "result": "PASS",
+      "detail": ""
+    },
+    {
+      "name": "no page errors",
+      "result": "PASS",
+      "detail": ""
+    }
+  ],
+  "errors": []
+}
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diff --git a/packages/sw/ai/AI_USAGE.md b/packages/sw/ai/AI_USAGE.md
index ab53b6f..e26b459 100644
--- a/packages/sw/ai/AI_USAGE.md
+++ b/packages/sw/ai/AI_USAGE.md
@@ -7,7 +7,8 @@
 | [COMPONENT_CATALOG.md](./COMPONENT_CATALOG.md) | 공식 공개 컴포넌트(Header·개별 컨트롤·Popup·도구 막대)·Props·Callback·크기·CSS 의존성 |
 | [DESIGN_RULES.md](./DESIGN_RULES.md) | SW 전용 토큰·Typography·간격·Hover/Focus/Selected·Overlay·Motion·반응형·Popup 외형·도구 버튼 |
 | [COMPOSITION_PATTERNS.md](./COMPOSITION_PATTERNS.md) | 완성형·간소화·기능 중심·확장 Header, Popup(자유 콘텐츠), 파일 열기 + 도구 막대 |
-| [examples/](./examples) | 공개 API만 쓰는 예제 A~F(E = 사용자 정의 Popup, F = 파일 열기 + 도구 막대. 독립 소비 프로젝트에서 Typecheck·Build·브라우저 검증) |
+| [examples/](./examples) | 공개 API만 쓰는 예제 A~F(E = 사용자 정의 Popup, F = 파일 열기 + 도구 막대. 독립 소비 프로젝트에서 Typecheck·Build·브라우저 검증), H = 뷰어 모드 |
+| [VIEWER.md](./VIEWER.md) | **뷰어 모드 전용**: `SWViewerHeader`(데이터 메뉴·More·외곽선·로고 규칙), `SWViewerMenu`(Dropdown·서브메뉴·우클릭), `SWViewerPanel`(팝업 프레임 + 자유 콘텐츠). 일반 SW 모드는 `SWHeader`·`SWPopup`을 그대로 씁니다 |
 
 ## 1. 작업 순서 (필수)
 
diff --git a/packages/sw/ai/VIEWER.md b/packages/sw/ai/VIEWER.md
new file mode 100644
index 0000000..288f314
--- /dev/null
+++ b/packages/sw/ai/VIEWER.md
@@ -0,0 +1,104 @@
+# @hm-design/sw — 뷰어 모드 (Viewer Header · Popup) 사용 지침
+
+기준: 2026-10-19, 참고 DWG/DXF 뷰어(`dwg-dxf-viewer-hm`) 상단 메뉴·팝업을 같은 해상도(1440 × 900)에서 실측해 패키지 컴포넌트로 옮긴 결과입니다. 아래 이름은 모두 `from "@hm-design/sw"` 공개 Export이고 CSS는 `@hm-design/sw/styles.css` 한 개입니다. 예제: [examples/ExampleH-ViewerMode.tsx](./examples/ExampleH-ViewerMode.tsx).
+
+## 1. 언제 무엇을 쓰나
+
+| 화면 | 사용 | 쓰지 않음 |
+|---|---|---|
+| SW 일반 모드 Header | `SWHeader` (49px, Figma 26:8944) | `SWViewerHeader` |
+| SW 뷰어 모드 Header | `SWViewerHeader` (52px, 참고 뷰어) | `SWHeader`에 뷰어 메뉴를 억지로 넣기, 직접 만든 툴바 |
+| 뷰어 메뉴 Dropdown·서브메뉴·우클릭 메뉴 | `type: "menu"` 항목의 `entries`, 단독은 `SWViewerMenu` | `@hm-design/ui` DropdownMenu를 Header 안에 직접 배치 |
+| 뷰어 팝업·설정창·도구 패널·입력 팝업 | `SWViewerPanel` (+ `modal`) | 새 프레임 작성, `SWPopup`(일반 SW 속성창 프레임)을 뷰어 디자인으로 재스타일 |
+| 일반 SW 팝업·속성창 | `SWPopup`, `SWHeaderPropertyPanel` (변경 없음) | `SWViewerPanel` |
+
+- 한 화면에는 Header 하나만 둡니다. 모드 전환은 프로그램이 Header 컴포넌트를 바꾸는 방식입니다(Storybook `SW/Viewer › SWHeader vs Viewer Header`). 파일·패널 상태는 프로그램 상태라 Header를 바꿔도 유지됩니다.
+- 뷰어 모드 진입·종료, 파일 처리, DWG/DXF 렌더링, 메뉴 명령 실행은 **프로그램 담당**입니다. 패키지는 UI와 공통 인터랙션(열기/닫기, Focus, 키보드, 위치·크기)만 담당합니다.
+- 기능이 없는 메뉴는 만들지 않습니다. 연결할 명령이 없으면 항목을 빼거나 `disabled`로 두고 “미연결”로 보고합니다.
+
+## 2. `SWViewerHeader`
+
+로고 면(사선) → 파일명 면 → 객체 수정 면(메뉴 그룹) → 오른쪽 끝 영역(`placement: "end"` 그룹 + `trailing`).
+
+| Props | 설명 |
+|---|---|
+| `groups: SWViewerHeaderGroup[]` | 메뉴 데이터(순서대로 배치). 그룹: `id`, `label`(접근성 이름·More 구획 제목), `moreLabel?`, `surface?: "plain" \| "field"`(field = 사용자 확정 속성 입력 면), `placement?: "start" \| "end"`, `hidden?`, `items` |
+| 항목 `SWViewerHeaderItem` | 공통: `id`, `label`, `icon?`(16px, 프로그램 제공), `title?`, `disabled?`, `hidden?`, `collapseBelow?`(Header 폭 미만이면 More로 이동), `iconOnlyBelow?`(미만이면 아이콘만), `iconOnly?`, `moreLabel?` |
+| `type: "button"` | `onSelect` |
+| `type: "toggle"` | `pressed`, `onPressedChange` (패널 열기/닫기 등) |
+| `type: "menu"` | `entries: SWViewerMenuEntry[]`, `menuWidth?`, `menuAlign?: "start" \| "end"` |
+| `type: "tabs"` | `value`, `options: { value, label, count?, title?, disabled? }[]`, `onValueChange` (Model / Layout) |
+| `type: "switch"` | `checked`, `onCheckedChange` (2.5D 등, 위 11px 캡션) |
+| `type: "custom"` | `render()`, `menuEntries?`(More에 넣을 항목) |
+| `onCommand(command)` | 모든 명령을 한 곳에서 받습니다: `{ id, itemId, value? }`. 항목 자체 Callback 다음에 호출 |
+| `documentTitle`, `documentPlaceholder`, `documentTooltip`, `document?` | 파일명 면 |
+| `logo?`, `logoSrc?`, `logoAlt?`, `onHomeClick?` | `SWHeader`와 같은 로고 Props. **주지 않으면 아무것도 그리지 않습니다**(“HM” 문자·기본 아이콘 없음, 로고 면은 사선 끝 24px만). 주면 72px 면(로고가 더 넓으면 그만큼), 높이 최대 24px |
+| `trailing?: ReactNode` | 오른쪽 끝 자유 영역: `SWViewerStatus`, `SWViewerHeaderButton` |
+| `moreLabel?`, `toolbarLabel?`, `<header>` 속성, `ref` | |
+
+- **반응형(참고 뷰어와 동일):** 항목별 `collapseBelow`로 More(⋯, 베이지 260px Dropdown)로 이동합니다. 참고 뷰어 기준값: 샘플·도면 공간·2.5D·어두운 배경 `1180`, 패널 토글 `900`, 파일 열기·전체 보기 `iconOnlyBelow: 560`. 1180px 미만은 간격 2px, 560px 미만은 상태 글자 숨김(CSS container). 가로 스크롤은 만들지 않습니다.
+- More는 그룹/항목 단위 구획으로 자동 구성됩니다: menu·tabs는 자기 구획(`moreLabel`), button·toggle·switch는 그룹 구획(`group.moreLabel ?? group.label`). toggle·switch는 체크 항목, tabs는 라디오 항목이 됩니다.
+- **상태 표현:** Hover = #266651 면, Active·Pressed·열림·선택 탭 = 글자·아이콘 #FFC600(선택 박스 없음), Disabled = 60% 불투명, Focus = 2px #FFC600 외곽선.
+- **글자·아이콘 외곽선(SWHeader와 동일):** 14px 글자 `--hm-sw-header-text-outline`(검정 1.3px), 11px 캡션·개수·상태 `--hm-sw-header-label-outline`(검정 1px), 아이콘 `--hm-sw-viewer-icon-outline`(SWHeader 아이콘 자산의 1px 검정 바깥 Stroke + #061A14 glow를 `drop-shadow`로 재현, 아이콘 윤곽을 따름). 색·크기·굵기·간격은 그대로이고 Hover/Active는 채움 색만 바뀝니다. Dropdown·패널 안에는 외곽선이 없습니다(SWHeader More 메뉴와 같음). 프로그램 아이콘은 `currentColor`로 그리면 상태 색과 외곽선이 자동 적용됩니다.
+
+## 3. `SWViewerMenu` / `SWViewerMenuEntry`
+
+`entries`: `item`(`icon?`, `shortcut?`, `onSelect`), `checkbox`(`checked`, `onCheckedChange`), `radio`(`checked`, `onSelect`), `submenu`(`entries` — 다단계), `label`, `separator`. 공통 `disabled?`, `hidden?`, `keepOpen?`.
+
+- Header의 `type: "menu"`가 이 Dropdown을 엽니다. 다른 위치(도면 우클릭 등)는 `SWViewerMenu`를 `open` / `onOpenChange` + `anchorRef`(버튼 아래 4px) 또는 `anchorPoint`(포인터 위치)로 씁니다. `surface="beige"`는 More 면, `initialFocus`는 `first`(키보드 열기) / `menu`(클릭 열기).
+- 키보드: Enter·Space·ArrowDown 열기, ↑↓ Home End 이동, → 서브메뉴 열기, ← 한 단계 닫기, Escape 닫고 Trigger로 Focus 복귀, Tab·바깥 클릭 닫기. 화면 끝에서는 위/왼쪽으로 뒤집혀 화면 안에 남습니다.
+
+## 4. `SWViewerPanel` — 팝업 프레임 + 자유 콘텐츠
+
+외형(베이지 #E0DACE 본문, 2px #897445 테두리, #221D13 제목 막대, #FFC600 제목, 접기, 곡선 녹색 닫기 → Hover #E40000)과 공통 동작은 패키지가, 내용은 `children`·`footer`가 담당합니다.
+
+| Props | 설명 |
+|---|---|
+| `title`, `icon?`, `open`, `onClose`, `closeLabel?` | 필수는 `title`·`open`·`onClose` |
+| `children` | 스크롤 본문. `SWViewerSection`(카드/plain, 12px 제목), `SWViewerField`(라벨 + 컨트롤, `inline` / `stacked` + `below`), `SWViewerSwitch`, `SWViewerSlider`, `SWViewerInput`, `SWViewerButton`, `SWViewerBadge`, `SWViewerHint`, 프로그램 목록·표 등 무엇이든 |
+| `footer?` | 하단 버튼 영역(본문 스크롤과 무관하게 고정). `SWViewerButton variant="outline" \| "primary"` |
+| `headerActions?` | 제목 막대 추가 버튼: `SWViewerButton variant="ghost"` (기본값 복원, 선택 확대 등) |
+| `width?`(320), `height?`(420, `"auto"` 가능), `minWidth?`(250), `minHeight?`(140) | 메뉴별 크기. 최대 90vw × 90vh |
+| `defaultPosition?` | `{ left, top }` 또는 `"top-end"`(기본) / `"top-start"` / `"center"`(modal 기본), `inset?: { top?, side? }`(기본 56 / 24 = 52px Header 아래) |
+| `strategy?` | `fixed`(기본, 화면) / `absolute`(가장 가까운 positioned 조상 안 — 미리보기·임베드) |
+| `draggable?`, `resizable?`, `collapsible?`, `defaultCollapsed?`, `collapsed?`, `onCollapsedChange?`, `onPositionChange?`, `onSizeChange?` | 제목 막대 드래그, 오른쪽 아래 모서리 크기 조절, 접기(버튼·제목 더블클릭). 이동·크기는 경계 10px 안 |
+| `modal?` | 10% 검정 배경, Focus Trap, 가운데 배치(입력·확인 팝업) |
+| `autoFocus?` | 열 때 패널로 Focus, 닫을 때 원래 위치로 복귀(기본 true) |
+
+- Escape는 Focus가 패널 안에 있을 때 그 패널만 닫습니다. 비모달 패널은 바깥 클릭으로 닫히지 않습니다(참고 뷰어와 동일, 도구 창). 마지막으로 누른 패널이 맨 앞으로 옵니다.
+- **콘텐츠 교체:** 같은 프레임에 다른 `children`을 넣습니다(레이어 목록 / 옵션 / 속성 / 입력 폼 — Storybook `Popup Content Variants`). 프레임을 복사하거나 `hm-sw-viewer-*` class로 새 팝업을 만들지 않습니다.
+
+## 5. 올바른 사용
+
+```tsx
+import { SWViewerHeader, SWViewerPanel, SWViewerSection, SWViewerField, SWViewerSwitch, type SWViewerHeaderGroup } from "@hm-design/sw"
+import "@hm-design/sw/styles.css"
+
+const groups: SWViewerHeaderGroup[] = [
+  { id: "view", label: "화면 보기", surface: "field", items: [{ type: "button", id: "fit", label: "전체 보기", icon: <FitIcon />, onSelect: fit }] },
+  { id: "panels", label: "패널", placement: "end", items: [{ type: "toggle", id: "options", label: "설정", icon: <OptionsIcon />, pressed: open, onPressedChange: setOpen, collapseBelow: 900 }] },
+]
+<SWViewerHeader documentTitle={fileName} groups={groups} onCommand={runCommand} />
+<SWViewerPanel title="옵션" open={open} onClose={() => setOpen(false)}>
+  <SWViewerSection title="표시">
+    <SWViewerField label="그리드">{id => <SWViewerSwitch id={id} checked={grid} onCheckedChange={setGrid} />}</SWViewerField>
+  </SWViewerSection>
+</SWViewerPanel>
+```
+
+## 6. 잘못된 사용
+
+| 하지 말 것 | 이유 / 대신 |
+|---|---|
+| `<SWViewerHeader logo="HM" />`처럼 로고가 없다고 임의 문자·아이콘 넣기 | 로고는 프로그램이 정합니다. 없으면 생략 |
+| 뷰어 Header를 `div` + `button`으로 다시 만들기, `hm-sw-viewer-*` class를 소비 코드에 붙이기 | 데이터(`groups`)와 `custom` / `trailing`으로 구성 |
+| Header 버튼 글자에 `-webkit-text-stroke`·`border`로 외곽선 만들기 | 외곽선은 패키지 토큰이 이미 적용합니다 |
+| 메뉴 색·간격을 `#123456`, `margin` 등 임의 값으로 덮기 | 토큰 `--hm-sw-viewer-*` / `--hm-sw-header-*`만 `style`로 조정(기본값 유지 권장) |
+| 존재하지 않는 Props 추측(`items`, `content`, `renderBody` …) | 위 표와 `dist/index.d.ts`가 전부 |
+| 일반 모드 화면에서 `SWViewerHeader` 사용, 뷰어에서 `SWHeader` 재스타일 | 모드별 Header를 바꿔 끼웁니다 |
+| 기능 없는 메뉴를 가짜 동작으로 연결 | 항목 제외 또는 `disabled` + 미연결 보고 |
+
+## 7. 디자인 변경 시 주의
+
+- 크기(52px Header, 34px 버튼, 40px 토글·탭·스위치 칸, 41~42px field 면, 72px 로고 면)와 색은 참고 뷰어 실측값입니다. 파일명·객체 수정·속성 면 배경은 SWHeader와 같은 사용자 확정 토큰(`--hm-sw-header-document-*`, `object-*`, `property-*`)을 공유하므로 바꾸면 두 Header가 함께 바뀝니다.
+- Light/Dark 분기는 없습니다. 참고 뷰어와의 알려진 차이: 도면 공간(tabs) field 면 높이 42px(참고 41px — 참고 Tabs 루트가 39px인 구현 부산물), 크기 조절은 네이티브 `resize` 대신 같은 위치의 모서리 Grip(모든 브라우저 동작), 패널 Escape 닫기 추가, 로고 기본 표시 없음(사용자 결정).
diff --git a/packages/sw/ai/examples/ExampleH-ViewerMode.tsx b/packages/sw/ai/examples/ExampleH-ViewerMode.tsx
new file mode 100644
index 0000000..623c9e9
--- /dev/null
+++ b/packages/sw/ai/examples/ExampleH-ViewerMode.tsx
@@ -0,0 +1,85 @@
+// Example H — viewer mode: SWViewerHeader (data-driven menu) + SWViewerPanel popups with free content.
+// Only public components. The program owns the state and the commands; the package owns the look and the
+// open / close / focus / keyboard / drag behavior. Icons are the program's own (16px, currentColor).
+import { useState } from "react"
+import {
+  SWViewerButton, SWViewerField, SWViewerHeader, SWViewerHeaderButton, SWViewerHint, SWViewerInput, SWViewerPanel,
+  SWViewerSection, SWViewerSlider, SWViewerStatus, SWViewerSwitch,
+  type SWViewerHeaderGroup,
+} from "@hm-design/sw"
+
+const Icon = ({ d }: { d: string }) => (
+  <svg viewBox="0 0 24 24" width="16" height="16" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true"><path d={d} /></svg>
+)
+const icons = {
+  open: <Icon d="M3 7h6l2 2h10v10H3z" />,
+  fit: <Icon d="M3 8V3h5M16 3h5v5M21 16v5h-5M8 21H3v-5" />,
+  layers: <Icon d="M12 3l9 5-9 5-9-5 9-5zM3 13l9 5 9-5" />,
+  options: <Icon d="M4 6h10M18 6h2M4 12h4M12 12h8M4 18h12M20 18h0" />,
+  info: <Icon d="M12 8h.01M11 12h1v5h1M12 3a9 9 0 1 0 0 18 9 9 0 0 0 0-18z" />,
+}
+
+export function ExampleHViewerMode({ onEvent }: { onEvent?: (name: string) => void }) {
+  const [fileName, setFileName] = useState<string | null>(null)
+  const [space, setSpace] = useState("model")
+  const [depth, setDepth] = useState(false)
+  const [panels, setPanels] = useState({ layers: false, options: false })
+  const [grid, setGrid] = useState(true)
+  const [zoomSpeed, setZoomSpeed] = useState(1)
+  const [about, setAbout] = useState(false)
+
+  const groups: SWViewerHeaderGroup[] = [
+    { id: "file", label: "파일", items: [
+      { type: "button", id: "open", label: "파일 열기", icon: icons.open, iconOnlyBelow: 560 },
+      { type: "menu", id: "samples", label: "샘플", moreLabel: "샘플 도면", collapseBelow: 1180, entries: [
+        { type: "item", id: "sample-a", label: "기본 도면 · DWG", onSelect: () => setFileName("BasicSample.dwg") },
+        { type: "submenu", id: "recent", label: "최근 도면", entries: [{ type: "item", id: "recent-1", label: "simple.dxf", onSelect: () => setFileName("simple.dxf") }] },
+      ] },
+    ] },
+    { id: "space", label: "도면 공간", surface: "field", hidden: !fileName, items: [
+      { type: "tabs", id: "space", label: "모델과 배치 선택", collapseBelow: 1180, value: space, onValueChange: setSpace,
+        options: [{ value: "model", label: "Model", count: 1200 }, { value: "layout", label: "Layout", count: 40 }] },
+    ] },
+    { id: "view", label: "화면 보기", surface: "field", items: [
+      { type: "button", id: "fit", label: "전체 보기", icon: icons.fit, iconOnlyBelow: 560, disabled: !fileName },
+      { type: "switch", id: "depth", label: "2.5D", checked: depth, collapseBelow: 1180, onCheckedChange: setDepth },
+    ] },
+    { id: "panels", label: "패널", placement: "end", items: [
+      { type: "toggle", id: "layers", label: "레이어", icon: icons.layers, pressed: panels.layers, collapseBelow: 900, onPressedChange: layers => setPanels({ ...panels, layers }) },
+      { type: "toggle", id: "options", label: "설정", icon: icons.options, pressed: panels.options, collapseBelow: 900, onPressedChange: options => setPanels({ ...panels, options }) },
+    ] },
+  ]
+
+  return (
+    <>
+      {/* No logo prop: nothing is drawn on the cap (no "HM" text). Pass logoSrc / logo to show the program's logo. */}
+      <SWViewerHeader documentTitle={fileName} groups={groups}
+        onCommand={command => onEvent?.(`${command.itemId}/${command.id}${command.value === undefined ? "" : `=${String(command.value)}`}`)}
+        trailing={<>
+          <SWViewerStatus state={fileName ? "ready" : "idle"} />
+          <SWViewerHeaderButton iconOnly icon={icons.info} label="정보" onClick={() => setAbout(true)} />
+        </>} />
+
+      <SWViewerPanel title="레이어" icon={icons.layers} open={panels.layers} onClose={() => setPanels({ ...panels, layers: false })}>
+        <SWViewerSection surface="plain" aria-label="레이어 목록">
+          <SWViewerHint>프로그램의 레이어 목록을 여기에 둡니다.</SWViewerHint>
+        </SWViewerSection>
+      </SWViewerPanel>
+
+      <SWViewerPanel title="옵션" icon={icons.options} open={panels.options} onClose={() => setPanels({ ...panels, options: false })} width={340} height="auto" inset={{ side: 356 }}
+        footer={<SWViewerButton variant="primary" onClick={() => { onEvent?.("options:apply"); setPanels({ ...panels, options: false }) }}>적용</SWViewerButton>}>
+        <SWViewerSection title="표시">
+          <SWViewerField label="그리드">{id => <SWViewerSwitch id={id} checked={grid} onCheckedChange={setGrid} />}</SWViewerField>
+          <SWViewerField label="줌 속도" layout="stacked" below={<SWViewerSlider aria-label="줌 속도" value={zoomSpeed} min={0.2} max={3} step={0.1} onValueChange={setZoomSpeed} />}>
+            {id => <SWViewerInput id={id} type="number" min={0.2} max={3} step={0.1} value={zoomSpeed} onChange={event => setZoomSpeed(Number(event.currentTarget.value))} />}
+          </SWViewerField>
+        </SWViewerSection>
+      </SWViewerPanel>
+
+      <SWViewerPanel modal title="정보" open={about} onClose={() => setAbout(false)} width={360} height="auto" resizable={false} collapsible={false}
+        footer={<SWViewerButton variant="primary" onClick={() => setAbout(false)}>확인</SWViewerButton>}>
+        <SWViewerHint>모듈 구성과 라이선스 고지는 프로그램이 제공합니다.</SWViewerHint>
+      </SWViewerPanel>
+    </>
+  )
+}
diff --git a/packages/sw/src/components/sw-viewer/SWViewerControls.tsx b/packages/sw/src/components/sw-viewer/SWViewerControls.tsx
new file mode 100644
index 0000000..7fb5828
--- /dev/null
+++ b/packages/sw/src/components/sw-viewer/SWViewerControls.tsx
@@ -0,0 +1,167 @@
+import { forwardRef, useId, type ButtonHTMLAttributes, type HTMLAttributes, type InputHTMLAttributes, type ReactNode } from "react"
+import "../../theme/sw-viewer.css"
+
+const cx = (...names: (string | false | undefined)[]) => names.filter(Boolean).join(" ")
+
+export interface SWViewerSwitchProps extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "onChange"> {
+  checked: boolean
+  onCheckedChange?: (checked: boolean) => void
+}
+
+/**
+ * 36 x 20 switch. Its face follows where it is placed: dark header face (off #0A221D, on #FFC600) inside
+ * SWViewerHeader, beige panel face (off #9A9284, on #266651) inside SWViewerPanel.
+ */
+export const SWViewerSwitch = forwardRef<HTMLButtonElement, SWViewerSwitchProps>(function SWViewerSwitch(
+  { checked, onCheckedChange, className, onClick, ...rest }, ref,
+) {
+  return (
+    <button ref={ref} type="button" role="switch" aria-checked={checked} data-state={checked ? "checked" : "unchecked"}
+      className={cx("hm-sw-viewer-switch", className)}
+      onClick={event => { onClick?.(event); if (!event.defaultPrevented) onCheckedChange?.(!checked) }} {...rest}>
+      <span className="hm-sw-viewer-switch__thumb" aria-hidden="true" />
+    </button>
+  )
+})
+
+export type SWViewerStatusState = "idle" | "loading" | "ready" | "error"
+
+export interface SWViewerStatusProps extends HTMLAttributes<HTMLDivElement> {
+  state: SWViewerStatusState
+  /** Short visible text. Default per state: 준비 / 불러오는 중 / 도면 열림 / 불러오기 실패. */
+  label?: string
+  /** Longer detail for screen readers and the tooltip. */
+  detail?: string
+}
+
+const statusLabel: Record<SWViewerStatusState, string> = { idle: "준비", loading: "불러오는 중", ready: "도면 열림", error: "불러오기 실패" }
+const StatusIcon = ({ state }: { state: SWViewerStatusState }) => state === "idle" ? null : (
+  <svg className={state === "loading" ? "hm-sw-viewer-status__spin" : undefined} viewBox="0 0 16 16" width="16" height="16" aria-hidden="true" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round">
+    {state === "loading" && <path d="M14 8a6 6 0 1 1-6-6" />}
+    {state === "ready" && <path d="M3.5 8.5l3 3 6-7" />}
+    {state === "error" && <><circle cx="8" cy="8" r="6" /><path d="M8 5v3.5M8 11h.01" /></>}
+  </svg>
+)
+
+/** Load state of the viewer header (reference status: muted 11px text, icon; text hides below 560px). */
+export function SWViewerStatus({ state, label, detail, className, ...rest }: SWViewerStatusProps) {
+  return (
+    <div role="status" className={cx("hm-sw-viewer-status", className)} data-state={state} title={detail} {...rest}>
+      <StatusIcon state={state} />
+      <span className="hm-sw-viewer-status__label">{label ?? statusLabel[state]}</span>
+      {detail && <span className="hm-sw-viewer-sr-only">: {detail}</span>}
+    </div>
+  )
+}
+
+export interface SWViewerButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  /**
+   * Panel buttons. `outline` (default): reference xs outline button (24px, white, #123328 border).
+   * `primary`: the same size filled with #123328 (footer confirm). `ghost`: icon button of the panel title bar.
+   */
+  variant?: "outline" | "primary" | "ghost"
+  icon?: ReactNode
+}
+
+export const SWViewerButton = forwardRef<HTMLButtonElement, SWViewerButtonProps>(function SWViewerButton(
+  { variant = "outline", icon, children, className, type = "button", ...rest }, ref,
+) {
+  return (
+    <button ref={ref} type={type} className={cx("hm-sw-viewer-button", className)} data-variant={variant} {...rest}>
+      {icon && <span className="hm-sw-viewer-button__icon" aria-hidden="true">{icon}</span>}
+      {children}
+    </button>
+  )
+})
+
+export type SWViewerInputProps = InputHTMLAttributes<HTMLInputElement>
+
+/** 28px panel input (#F5F0E5 face, #9A9284 border, 12px). Any native input type. */
+export const SWViewerInput = forwardRef<HTMLInputElement, SWViewerInputProps>(function SWViewerInput({ className, ...rest }, ref) {
+  return <input ref={ref} className={cx("hm-sw-viewer-input", className)} {...rest} />
+})
+
+export interface SWViewerSliderProps extends Omit<InputHTMLAttributes<HTMLInputElement>, "type" | "value" | "onChange"> {
+  value: number
+  min: number
+  max: number
+  step?: number
+  onValueChange?: (value: number) => void
+}
+
+/** Panel slider (6px #E0DACE track, #266651 range, 18px white thumb with #266651 ring). Native range input. */
+export const SWViewerSlider = forwardRef<HTMLInputElement, SWViewerSliderProps>(function SWViewerSlider(
+  { value, min, max, step = 1, onValueChange, className, style, ...rest }, ref,
+) {
+  const percent = max > min ? ((Math.min(max, Math.max(min, value)) - min) / (max - min)) * 100 : 0
+  return (
+    <input ref={ref} type="range" className={cx("hm-sw-viewer-slider", className)} value={value} min={min} max={max} step={step}
+      style={{ ...style, ["--hm-sw-viewer-slider-percent" as string]: `${percent}%` }}
+      onChange={event => onValueChange?.(Number(event.currentTarget.value))} {...rest} />
+  )
+})
+
+export interface SWViewerFieldProps extends Omit<HTMLAttributes<HTMLDivElement>, "children"> {
+  label: string
+  /** Control id for the label. Generated when omitted and `children` is a function. */
+  htmlFor?: string
+  /**
+   * `inline` (default): label left, control right (switch rows). `stacked`: label + control row, then `below`
+   * (slider rows: number input beside the label, slider underneath).
+   */
+  layout?: "inline" | "stacked"
+  /** Unit after the control. */
+  unit?: string
+  /** Stacked layout: content under the label row (a slider). */
+  below?: ReactNode
+  disabled?: boolean
+  children: ReactNode | ((id: string) => ReactNode)
+}
+
+/** Label + control row of the viewer panel (reference option rows). */
+export function SWViewerField({ label, htmlFor, layout = "inline", unit, below, disabled, children, className, ...rest }: SWViewerFieldProps) {
+  const generated = useId()
+  const id = htmlFor ?? generated
+  return (
+    <div className={cx("hm-sw-viewer-field", className)} data-layout={layout} data-disabled={disabled || undefined} {...rest}>
+      <div className="hm-sw-viewer-field__row">
+        <label className="hm-sw-viewer-field__label" htmlFor={id}>{label}</label>
+        <div className="hm-sw-viewer-field__control">
+          {typeof children === "function" ? children(id) : children}
+          {unit && <span className="hm-sw-viewer-field__unit">{unit}</span>}
+        </div>
+      </div>
+      {below}
+    </div>
+  )
+}
+
+export interface SWViewerBadgeProps extends HTMLAttributes<HTMLSpanElement> { children: ReactNode }
+
+/** Count badge of panel lists (12px 500, #F4F1EA face). */
+export function SWViewerBadge({ className, ...rest }: SWViewerBadgeProps) {
+  return <span className={cx("hm-sw-viewer-badge", className)} {...rest} />
+}
+
+export interface SWViewerSectionProps extends Omit<HTMLAttributes<HTMLElement>, "title"> {
+  /** 12px 700 heading (reference panel h4). Also the section's accessible name. */
+  title?: string
+  /** `card` (default): the inset #F5F0E5 card. `plain`: no face (lists). */
+  surface?: "card" | "plain"
+  children?: ReactNode
+}
+
+/** A content group of SWViewerPanel. Children are free (fields, lists, any component). */
+export function SWViewerSection({ title, surface = "card", children, className, ...rest }: SWViewerSectionProps) {
+  return (
+    <section className={cx("hm-sw-viewer-section", className)} data-surface={surface} aria-label={rest["aria-label"] ?? title} {...rest}>
+      {title && <h4 className="hm-sw-viewer-section__title">{title}</h4>}
+      {children}
+    </section>
+  )
+}
+
+/** Muted 12px help text of a panel section. */
+export function SWViewerHint({ className, ...rest }: HTMLAttributes<HTMLParagraphElement>) {
+  return <p className={cx("hm-sw-viewer-hint", className)} {...rest} />
+}
diff --git a/packages/sw/src/components/sw-viewer/SWViewerHeader.tsx b/packages/sw/src/components/sw-viewer/SWViewerHeader.tsx
new file mode 100644
index 0000000..69dc9f1
--- /dev/null
+++ b/packages/sw/src/components/sw-viewer/SWViewerHeader.tsx
@@ -0,0 +1,287 @@
+import { forwardRef, useId, useLayoutEffect, useRef, useState, type ButtonHTMLAttributes, type HTMLAttributes, type KeyboardEvent, type ReactNode } from "react"
+import { SWViewerMenu } from "./SWViewerMenu"
+import { SWViewerSwitch } from "./SWViewerControls"
+import type { SWViewerCommand, SWViewerHeaderGroup, SWViewerHeaderItem, SWViewerMenuEntry } from "./types"
+import "../../theme/sw-viewer.css"
+
+export interface SWViewerHeaderProps extends Omit<HTMLAttributes<HTMLElement>, "title"> {
+  /**
+   * Logo image URL of the program (same prop as SWHeader), max 24px high on the slanted green cap.
+   * The logo belongs to each program: nothing is rendered when omitted (no default text or icon) and the cap
+   * shrinks to its slanted edge.
+   */
+  logoSrc?: string
+  /** Logo element (inline SVG, <img>, ...). Takes precedence over `logoSrc` (same prop as SWHeader). */
+  logo?: ReactNode
+  /** Accessible product name (same prop as SWHeader). With `onHomeClick` the button is "<logoAlt> 홈". */
+  logoAlt?: string
+  /** Makes the logo cap a button (e.g. back to the normal SW mode). Same prop as SWHeader. */
+  onHomeClick?: () => void
+  /** Open file name. `null` / empty shows `documentPlaceholder`. */
+  documentTitle?: string | null
+  /** Default `열린 도면 없음`. */
+  documentPlaceholder?: string
+  /** Tooltip of the file name. Default: the name, or `파일 열기 또는 샘플을 선택하세요`. */
+  documentTooltip?: string
+  /** Replaces the file-name text (the dark document well stays). */
+  document?: ReactNode
+  /** Menu data, in order. Groups with `placement="end"` form the trailing action area. */
+  groups: SWViewerHeaderGroup[]
+  /** Free content after the trailing groups (status, info button, ...). */
+  trailing?: ReactNode
+  /** Every command of the header and its dropdowns (after the item's own callback). */
+  onCommand?: (command: SWViewerCommand) => void
+  /** Accessible name of the More button. Default `추가 도구`. */
+  moreLabel?: string
+  /** Accessible name of the object surface. Default `도면 작업 도구`. */
+  toolbarLabel?: string
+}
+
+const MoreIcon = () => (
+  <svg viewBox="0 0 16 16" width="16" height="16" aria-hidden="true" fill="currentColor"><circle cx="3" cy="8" r="1.4" /><circle cx="8" cy="8" r="1.4" /><circle cx="13" cy="8" r="1.4" /></svg>
+)
+const ChevronDown = () => (
+  <svg viewBox="0 0 16 16" width="16" height="16" aria-hidden="true"><path d="M4 6l4 4 4-4" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round" /></svg>
+)
+
+const isShown = (item: { hidden?: boolean; collapseBelow?: number }, width: number) => !item.hidden && !(item.collapseBelow !== undefined && width < item.collapseBelow)
+
+/** More entries of the collapsed items, one section per group (menus and tabs get their own section). */
+function moreEntries(groups: SWViewerHeaderGroup[], width: number, command: (c: SWViewerCommand) => void, owners: Map<string, string>): SWViewerMenuEntry[] {
+  const sections: SWViewerMenuEntry[][] = []
+  // Dropdown entries keep their own callbacks; the More menu reports them to onCommand with their owner item.
+  const own = (entries: SWViewerMenuEntry[], itemId: string) => entries.forEach(entry => { owners.set(entry.id, itemId); if (entry.type === "submenu") own(entry.entries, itemId) })
+  for (const group of groups) {
+    if (group.hidden) continue
+    const collapsed = group.items.filter(item => !item.hidden && item.collapseBelow !== undefined && width < item.collapseBelow)
+    let plain: SWViewerMenuEntry[] = []
+    const flush = () => { if (plain.length) sections.push([{ type: "label", id: `${group.id}:more`, label: group.moreLabel ?? group.label }, ...plain]); plain = [] }
+    for (const item of collapsed) {
+      if (item.type === "custom") { if (item.menuEntries?.length) { flush(); own(item.menuEntries, item.id); sections.push(item.menuEntries) } continue }
+      if (item.type === "menu") {
+        flush()
+        own(item.entries, item.id)
+        sections.push([{ type: "label", id: `${item.id}:more`, label: item.moreLabel ?? item.label },
+          ...item.entries.map(entry => (entry.type === "label" || entry.type === "separator" ? entry : { ...entry, disabled: entry.disabled || item.disabled }))])
+      } else if (item.type === "tabs") {
+        flush()
+        sections.push([{ type: "label", id: `${item.id}:more`, label: item.moreLabel ?? item.label }, ...item.options.map(option => ({
+          type: "radio" as const, id: `${item.id}:${option.value}`, checked: option.value === item.value, disabled: option.disabled || item.disabled,
+          label: option.count !== undefined && option.count > 0 ? `${option.label} · ${option.count.toLocaleString()}개` : option.label,
+          onSelect: () => { item.onValueChange?.(option.value); command({ id: item.id, itemId: item.id, value: option.value }) },
+        }))])
+      } else if (item.type === "button") {
+        plain.push({ type: "item", id: item.id, label: item.label, icon: item.icon, disabled: item.disabled, onSelect: () => { item.onSelect?.(); command({ id: item.id, itemId: item.id }) } })
+      } else {
+        const checked = item.type === "toggle" ? item.pressed : item.checked
+        plain.push({ type: "checkbox", id: item.id, label: item.label, checked, disabled: item.disabled, onCheckedChange: next => {
+          if (item.type === "toggle") item.onPressedChange?.(next); else item.onCheckedChange?.(next)
+          command({ id: item.id, itemId: item.id, value: next })
+        } })
+      }
+    }
+    flush()
+  }
+  return sections.flatMap((section, index) => (index ? [{ type: "separator" as const, id: `more-sep-${index}` }, ...section] : section))
+}
+
+function MenuButton({ item, iconOnly, onCommand }: { item: Extract<SWViewerHeaderItem, { type: "menu" }>; iconOnly: boolean | "always"; onCommand: (c: SWViewerCommand) => void }) {
+  const ref = useRef<HTMLButtonElement>(null)
+  const [open, setOpen] = useState(false)
+  const [focus, setFocus] = useState<"first" | "menu">("menu")
+  const menuId = useId()
+  const show = (how: "first" | "menu") => { setFocus(how); setOpen(true) }
+  return (
+    <>
+      <button ref={ref} type="button" className="hm-sw-viewer-header__button" data-kind="menu" data-icon-only={iconOnly === "always" ? "always" : iconOnly ? "" : undefined} data-state={open ? "open" : undefined}
+        aria-haspopup="menu" aria-expanded={open} aria-controls={open ? menuId : undefined} aria-label={iconOnly ? item.label : undefined} title={item.title} disabled={item.disabled}
+        onClick={() => (open ? setOpen(false) : show("menu"))}
+        onKeyDown={event => { if (event.key === "ArrowDown" || ((event.key === "Enter" || event.key === " ") && !open)) { event.preventDefault(); show("first") } }}>
+        {item.icon && <span className="hm-sw-viewer-header__icon" aria-hidden="true">{item.icon}</span>}
+        {!iconOnly && <span className="hm-sw-viewer-header__label">{item.label}</span>}
+        <span className="hm-sw-viewer-header__chevron"><ChevronDown /></span>
+      </button>
+      <SWViewerMenu id={menuId} entries={item.entries} open={open} onOpenChange={setOpen} anchorRef={ref} align={item.menuAlign} width={item.menuWidth} label={item.label} initialFocus={focus}
+        onEntrySelect={entry => onCommand({ id: entry.id, itemId: item.id, value: entry.type === "checkbox" ? !entry.checked : undefined })} />
+    </>
+  )
+}
+
+function Tabs({ item, onCommand }: { item: Extract<SWViewerHeaderItem, { type: "tabs" }>; onCommand: (c: SWViewerCommand) => void }) {
+  const select = (value: string) => { item.onValueChange?.(value); onCommand({ id: item.id, itemId: item.id, value }) }
+  const onKeyDown = (event: KeyboardEvent<HTMLDivElement>) => {
+    const keys = ["ArrowRight", "ArrowLeft", "ArrowDown", "ArrowUp", "Home", "End"]
+    if (!keys.includes(event.key)) return
+    const buttons = Array.from(event.currentTarget.querySelectorAll<HTMLButtonElement>('[role="radio"]:not(:disabled)'))
+    const index = buttons.indexOf(document.activeElement as HTMLButtonElement)
+    if (index < 0) return
+    event.preventDefault()
+    const next = event.key === "Home" ? 0 : event.key === "End" ? buttons.length - 1 : (index + (event.key === "ArrowRight" || event.key === "ArrowDown" ? 1 : -1) + buttons.length) % buttons.length
+    buttons[next].focus()
+    buttons[next].click()
+  }
+  const current = item.options.some(option => option.value === item.value) ? item.value : item.options.find(option => !option.disabled)?.value
+  return (
+    <div role="radiogroup" aria-label={item.label} className="hm-sw-viewer-header__tabs" onKeyDown={onKeyDown}>
+      {item.options.map(option => {
+        const selected = option.value === item.value
+        return (
+          <button key={option.value} type="button" role="radio" aria-checked={selected} tabIndex={option.value === current ? 0 : -1}
+            className="hm-sw-viewer-header__tab" data-state={selected ? "active" : undefined} title={option.title} disabled={item.disabled || option.disabled}
+            onClick={() => { if (!selected) select(option.value) }}>
+            {option.label}
+            {option.count !== undefined && option.count > 0 && <span className="hm-sw-viewer-header__count">{option.count.toLocaleString()}</span>}
+          </button>
+        )
+      })}
+    </div>
+  )
+}
+
+function SwitchField({ item, onCommand }: { item: Extract<SWViewerHeaderItem, { type: "switch" }>; onCommand: (c: SWViewerCommand) => void }) {
+  const id = useId()
+  return (
+    <div className="hm-sw-viewer-header__switch-field" title={item.title}>
+      <label htmlFor={id} className="hm-sw-viewer-header__switch-label">{item.label}</label>
+      <SWViewerSwitch id={id} checked={item.checked} disabled={item.disabled}
+        onCheckedChange={next => { item.onCheckedChange?.(next); onCommand({ id: item.id, itemId: item.id, value: next }) }} />
+    </div>
+  )
+}
+
+function Item({ item, width, onCommand }: { item: SWViewerHeaderItem; width: number; onCommand: (c: SWViewerCommand) => void }) {
+  if (item.type === "custom") return <>{item.render()}</>
+  const iconOnly = !!item.icon && (item.iconOnly ? "always" : item.iconOnlyBelow !== undefined && width < item.iconOnlyBelow)
+  if (item.type === "menu") return <MenuButton item={item} iconOnly={iconOnly} onCommand={onCommand} />
+  if (item.type === "tabs") return <Tabs item={item} onCommand={onCommand} />
+  if (item.type === "switch") return <SwitchField item={item} onCommand={onCommand} />
+  const toggle = item.type === "toggle"
+  return (
+    <SWViewerHeaderButton label={item.label} icon={item.icon} iconOnly={iconOnly === "always" ? true : iconOnly ? "compact" : false} pressed={toggle ? item.pressed : undefined} title={item.title} disabled={item.disabled}
+      onClick={() => {
+        if (toggle) { item.onPressedChange?.(!item.pressed); onCommand({ id: item.id, itemId: item.id, value: !item.pressed }) }
+        else { item.onSelect?.(); onCommand({ id: item.id, itemId: item.id }) }
+      }} />
+  )
+}
+
+export interface SWViewerHeaderButtonProps extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, "children"> {
+  /** Visible text, or the accessible name when `iconOnly`. */
+  label: string
+  /** 16px icon supplied by the program. */
+  icon?: ReactNode
+  /**
+   * `true`: always icon only, the 32 x 40 icon button (info, More). `"compact"`: the 34 x 34 command button shown
+   * without its label (what `iconOnlyBelow` does). Default false.
+   */
+  iconOnly?: boolean | "compact"
+  /** Toggle state (aria-pressed, #FFC600 when on). Leave undefined for a command button. */
+  pressed?: boolean
+}
+
+/**
+ * The viewer header button for the `trailing` slot or a `custom` item (e.g. the info button that opens a modal
+ * SWViewerPanel). Same look as the data-driven items: transparent, #266651 hover, #FFC600 when pressed.
+ */
+export const SWViewerHeaderButton = forwardRef<HTMLButtonElement, SWViewerHeaderButtonProps>(function SWViewerHeaderButton(
+  { label, icon, iconOnly = false, pressed, className, type = "button", ...rest }, ref,
+) {
+  const kind = pressed === undefined ? "button" : "toggle"
+  return (
+    <button ref={ref} type={type} className={`hm-sw-viewer-header__button${className ? ` ${className}` : ""}`} data-kind={kind} data-icon-only={iconOnly === true ? "always" : iconOnly ? "" : undefined}
+      data-state={pressed === undefined ? undefined : pressed ? "on" : "off"} aria-pressed={pressed} aria-label={iconOnly ? label : undefined} {...rest}>
+      {icon && <span className="hm-sw-viewer-header__icon" aria-hidden="true">{icon}</span>}
+      {!iconOnly && <span className="hm-sw-viewer-header__label">{label}</span>}
+    </button>
+  )
+})
+
+/**
+ * SW viewer-mode header (reference DWG/DXF viewer top menu): slanted brand cap → dark file-name well → one green
+ * object surface holding data-driven menu groups, with a trailing action area. Items move into the More dropdown
+ * by `collapseBelow` (measured header width, never horizontal scroll). Pure presentation: values are props, every
+ * action is a callback (`onCommand` plus each item's own). Use SWHeader for the normal SW mode.
+ */
+export const SWViewerHeader = forwardRef<HTMLElement, SWViewerHeaderProps>(function SWViewerHeader(
+  {
+    logo, logoSrc, logoAlt, onHomeClick, documentTitle, documentPlaceholder = "열린 도면 없음", documentTooltip, document: documentNode,
+    groups, trailing, onCommand, moreLabel = "추가 도구", toolbarLabel = "도면 작업 도구", className, ...rest
+  },
+  forwardedRef,
+) {
+  const rootRef = useRef<HTMLElement | null>(null)
+  const [width, setWidth] = useState(1920)
+  const gradientId = `hm-sw-viewer-brand-${useId().replace(/:/g, "")}`
+  useLayoutEffect(() => {
+    const root = rootRef.current
+    if (!root) return
+    const update = () => setWidth(root.getBoundingClientRect().width)
+    update()
+    const observer = new ResizeObserver(update)
+    observer.observe(root)
+    return () => observer.disconnect()
+  }, [])
+  const command = (value: SWViewerCommand) => onCommand?.(value)
+  const owners = new Map<string, string>()
+  const more = moreEntries(groups, width, command, owners)
+  const moreRef = useRef<HTMLButtonElement>(null)
+  const [moreOpen, setMoreOpen] = useState(false)
+  const [moreFocus, setMoreFocus] = useState<"first" | "menu">("menu")
+  const renderGroup = (group: SWViewerHeaderGroup) => {
+    const items = group.items.filter(item => isShown(item, width))
+    if (group.hidden || !items.length) return null
+    return (
+      <div key={group.id} role="group" aria-label={group.label} className="hm-sw-viewer-header__group" data-surface={group.surface ?? "plain"} data-group={group.id}>
+        {items.map(item => <Item key={item.id} item={item} width={width} onCommand={command} />)}
+      </div>
+    )
+  }
+  const start = groups.filter(group => group.placement !== "end")
+  const end = groups.filter(group => group.placement === "end")
+  const name = documentTitle || documentPlaceholder
+  const mark = logo ?? (logoSrc ? <img src={logoSrc} alt="" /> : null)
+  const brandContent = (
+    <>
+      <svg className="hm-sw-viewer-header__brand-shape" viewBox="0 0 88 52" preserveAspectRatio="xMaxYMid slice" aria-hidden="true" focusable="false">
+        <defs>
+          <linearGradient id={gradientId} x1="0" y1="0" x2="0" y2="1">
+            <stop offset="0%" stopColor="var(--hm-sw-viewer-brand-top)" />
+            <stop offset="45%" stopColor="var(--hm-sw-viewer-brand-middle)" />
+            <stop offset="100%" stopColor="var(--hm-sw-viewer-brand-bottom)" />
+          </linearGradient>
+        </defs>
+        <path d="M 0 0 H 88 L 73 44 Q 70 52 62 52 H 0 Z" fill={`url(#${gradientId})`} />
+        <path d="M 88 0 L 73 44 Q 70 52 62 52 H 0" fill="none" stroke="var(--hm-sw-viewer-brand-middle)" vectorEffect="non-scaling-stroke" />
+      </svg>
+      {mark && <span className="hm-sw-viewer-header__brand-mark" aria-hidden="true">{mark}</span>}
+    </>
+  )
+  return (
+    <header ref={node => { rootRef.current = node; if (typeof forwardedRef === "function") forwardedRef(node); else if (forwardedRef) forwardedRef.current = node }}
+      className={`hm-sw-theme hm-sw-viewer-header${className ? ` ${className}` : ""}`} {...rest}>
+      {onHomeClick
+        ? <button type="button" className="hm-sw-viewer-header__brand" data-logo={mark ? "" : undefined} aria-label={logoAlt ? `${logoAlt} 홈` : "홈"} title={logoAlt} onClick={onHomeClick}>{brandContent}</button>
+        : <div className="hm-sw-viewer-header__brand" data-logo={mark ? "" : undefined} role={logoAlt ? "img" : undefined} aria-label={logoAlt}>{brandContent}</div>}
+      <div className="hm-sw-viewer-header__document" role="group" aria-label="현재 도면">
+        {documentNode ?? <span className="hm-sw-viewer-header__document-name" data-empty={!documentTitle || undefined} title={documentTooltip ?? (documentTitle || "파일 열기 또는 샘플을 선택하세요")}>{name}</span>}
+      </div>
+      <div className="hm-sw-viewer-header__object" role="toolbar" aria-label={toolbarLabel}>
+        {start.map(renderGroup)}
+        {more.length > 0 && <>
+          <button ref={moreRef} type="button" className="hm-sw-viewer-header__button hm-sw-viewer-header__more" data-icon-only="always" data-state={moreOpen ? "open" : undefined}
+            aria-label={moreLabel} title="더보기" aria-haspopup="menu" aria-expanded={moreOpen}
+            onClick={() => { setMoreFocus("menu"); setMoreOpen(!moreOpen) }}
+            onKeyDown={event => { if (event.key === "ArrowDown") { event.preventDefault(); setMoreFocus("first"); setMoreOpen(true) } }}>
+            <span className="hm-sw-viewer-header__icon"><MoreIcon /></span>
+          </button>
+          <SWViewerMenu entries={more} open={moreOpen} onOpenChange={setMoreOpen} anchorRef={moreRef} align="end" width={260} surface="beige" label={moreLabel} initialFocus={moreFocus}
+            onEntrySelect={entry => {
+              const owner = owners.get(entry.id)
+              if (owner) command({ id: entry.id, itemId: owner, value: entry.type === "checkbox" ? !entry.checked : undefined })
+            }} />
+        </>}
+        {(end.length > 0 || trailing) && <div className="hm-sw-viewer-header__actions">{end.map(renderGroup)}{trailing}</div>}
+      </div>
+    </header>
+  )
+})
diff --git a/packages/sw/src/components/sw-viewer/SWViewerMenu.tsx b/packages/sw/src/components/sw-viewer/SWViewerMenu.tsx
new file mode 100644
index 0000000..958d043
--- /dev/null
+++ b/packages/sw/src/components/sw-viewer/SWViewerMenu.tsx
@@ -0,0 +1,226 @@
+import { useEffect, useLayoutEffect, useRef, useState, type KeyboardEvent, type ReactNode, type RefObject } from "react"
+import type { SWViewerMenuEntry } from "./types"
+import "../../theme/sw-viewer.css"
+
+export interface SWViewerMenuProps {
+  entries: SWViewerMenuEntry[]
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  /** Element the menu opens below (a header button). Focus returns to it on close. */
+  anchorRef?: RefObject<HTMLElement | null>
+  /** Opens at a point instead (context menu: the pointer position). */
+  anchorPoint?: { x: number; y: number }
+  /** Edge aligned to the anchor. Default `start`. */
+  align?: "start" | "end"
+  /** Width in px. Default: its content (min 160). */
+  width?: number
+  /** `light` (default): the white dropdown face. `beige`: the More face of the viewer header. */
+  surface?: "light" | "beige"
+  /** Accessible name of the menu. */
+  label?: string
+  /** Called for every activated entry (after its own callback). */
+  onEntrySelect?: (entry: SWViewerMenuEntry) => void
+  /** `first` (default): focus the first entry, as after Enter / ArrowDown. `menu`: focus the list, as after a click. */
+  initialFocus?: "first" | "menu"
+  /** Id of the menu element (for the trigger's aria-controls). */
+  id?: string
+  className?: string
+}
+
+const ITEM_SELECTOR = ':scope > [role="none"] > [role^="menuitem"]:not([aria-disabled="true"])'
+
+function visible(entries: SWViewerMenuEntry[]) {
+  const shown = entries.filter(entry => !entry.hidden)
+  // No leading, trailing or doubled separators once hidden entries are gone.
+  return shown.filter((entry, index) => entry.type !== "separator"
+    || (index > 0 && index < shown.length - 1 && shown[index - 1].type !== "separator"))
+}
+
+const CheckIcon = () => (
+  <svg viewBox="0 0 16 16" width="16" height="16" aria-hidden="true"><path d="M3.5 8.5l3 3 6-7" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" /></svg>
+)
+const ChevronRight = () => (
+  <svg viewBox="0 0 16 16" width="16" height="16" aria-hidden="true"><path d="M6 3.5l4.5 4.5L6 12.5" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round" /></svg>
+)
+
+interface ListProps {
+  entries: SWViewerMenuEntry[]
+  surface: "light" | "beige"
+  width?: number
+  label?: string
+  /** Fixed position computer: receives the list size, returns left/top. */
+  place: (width: number, height: number) => { left: number; top: number }
+  /** Activate: run the entry and close everything (unless keepOpen). */
+  activate: (entry: SWViewerMenuEntry) => void
+  /** Escape / Tab: close everything. */
+  closeAll: (returnFocus: boolean) => void
+  /** ArrowLeft inside a submenu: close only this level. */
+  closeLevel?: () => void
+  /** `first`: focus the first entry (keyboard open). `menu`: focus the list itself (pointer open). */
+  autoFocus: "first" | "menu" | false
+  id?: string
+  className?: string
+}
+
+function MenuList({ entries, surface, width, label, place, activate, closeAll, closeLevel, autoFocus, id, className }: ListProps) {
+  const ref = useRef<HTMLDivElement>(null)
+  const [position, setPosition] = useState<{ left: number; top: number } | null>(null)
+  const [openSub, setOpenSub] = useState<string | null>(null)
+  const [focusSub, setFocusSub] = useState(false)
+  const placeRef = useRef(place)
+  placeRef.current = place
+  useLayoutEffect(() => {
+    const update = () => {
+      const list = ref.current
+      if (!list) return
+      const next = placeRef.current(list.offsetWidth, list.offsetHeight)
+      setPosition(current => (current && current.left === next.left && current.top === next.top ? current : next))
+    }
+    update()
+    window.addEventListener("resize", update)
+    window.addEventListener("scroll", update, true)
+    return () => { window.removeEventListener("resize", update); window.removeEventListener("scroll", update, true) }
+  }, [])
+  useEffect(() => {
+    if (!autoFocus || !position) return
+    const target = autoFocus === "first" ? ref.current?.querySelector<HTMLElement>(ITEM_SELECTOR) : ref.current
+    target?.focus({ preventScroll: true })
+  }, [autoFocus, position !== null])
+
+  const items = () => Array.from(ref.current?.querySelectorAll<HTMLElement>(ITEM_SELECTOR) ?? [])
+  const onKeyDown = (event: KeyboardEvent<HTMLDivElement>) => {
+    // Only this level's own keys; a submenu inside handles (and stops) its own.
+    if (event.nativeEvent.isComposing) return
+    const list = items()
+    const index = list.indexOf(document.activeElement as HTMLElement)
+    const move = (next: number) => { event.preventDefault(); list[(next + list.length) % list.length]?.focus() }
+    switch (event.key) {
+      case "ArrowDown": move(index + 1); break
+      case "ArrowUp": move(index < 0 ? list.length - 1 : index - 1); break
+      case "Home": move(0); break
+      case "End": move(list.length - 1); break
+      case "ArrowLeft":
+        if (closeLevel) { event.preventDefault(); event.stopPropagation(); closeLevel() }
+        break
+      case "Escape": event.preventDefault(); event.stopPropagation(); closeAll(true); break
+      case "Tab": closeAll(false); break
+      default: return
+    }
+    event.stopPropagation()
+  }
+
+  const rows: ReactNode[] = visible(entries).map(entry => {
+    if (entry.type === "separator") return <div key={entry.id} role="separator" className="hm-sw-viewer-menu__separator" />
+    if (entry.type === "label") return <div key={entry.id} role="presentation" className="hm-sw-viewer-menu__label">{entry.label}</div>
+    const disabled = !!entry.disabled
+    const common = {
+      tabIndex: -1,
+      "aria-disabled": disabled || undefined,
+      "data-entry": entry.id,
+      onPointerMove: (event: { currentTarget: HTMLElement }) => {
+        if (disabled) return
+        if (document.activeElement !== event.currentTarget) event.currentTarget.focus({ preventScroll: true })
+        if (entry.type !== "submenu" && openSub) setOpenSub(null)
+      },
+    }
+    if (entry.type === "submenu") {
+      const expanded = openSub === entry.id
+      const openThis = (focus: boolean) => { if (disabled) return; setFocusSub(focus); setOpenSub(entry.id) }
+      return (
+        <div key={entry.id} role="none" className="hm-sw-viewer-menu__entry">
+          <button type="button" role="menuitem" className="hm-sw-viewer-menu__item" aria-haspopup="menu" aria-expanded={expanded} data-state={expanded ? "open" : undefined} {...common}
+            onPointerEnter={() => openThis(false)}
+            onClick={() => openThis(true)}
+            onKeyDown={event => { if (event.key === "ArrowRight" || event.key === "Enter" || event.key === " ") { event.preventDefault(); event.stopPropagation(); openThis(true) } }}>
+            <span className="hm-sw-viewer-menu__icon" aria-hidden="true">{entry.icon}</span>
+            <span className="hm-sw-viewer-menu__text">{entry.label}</span>
+            <span className="hm-sw-viewer-menu__chevron"><ChevronRight /></span>
+          </button>
+          {expanded && <MenuList entries={entry.entries} surface={surface} label={entry.label} autoFocus={focusSub ? "first" : false}activate={activate} closeAll={closeAll}
+            closeLevel={() => { setOpenSub(null); ref.current?.querySelector<HTMLElement>(`[data-entry="${CSS.escape(entry.id)}"]`)?.focus() }}
+            place={(w, h) => {
+              const row = ref.current?.querySelector<HTMLElement>(`[data-entry="${CSS.escape(entry.id)}"]`)?.getBoundingClientRect()
+              const vw = document.documentElement.clientWidth, vh = window.innerHeight
+              if (!row) return { left: 0, top: 0 }
+              // Beside the parent list (its outer edge), first entry level with the row; flips left at the screen edge.
+              const list = ref.current!.getBoundingClientRect()
+              const left = list.right + w <= vw - 4 ? list.right : Math.max(4, list.left - w)
+              return { left, top: Math.max(4, Math.min(row.top - 5, vh - h - 4)) }
+            }} />}
+        </div>
+      )
+    }
+    const role = entry.type === "checkbox" ? "menuitemcheckbox" : entry.type === "radio" ? "menuitemradio" : "menuitem"
+    const checked = entry.type === "item" ? undefined : entry.checked
+    return (
+      <div key={entry.id} role="none" className="hm-sw-viewer-menu__entry">
+        <button type="button" role={role} className="hm-sw-viewer-menu__item" aria-checked={checked} data-kind={entry.type} {...common}
+          onClick={() => { if (!disabled) activate(entry) }}>
+          <span className="hm-sw-viewer-menu__icon" aria-hidden="true">
+            {entry.type === "item" ? entry.icon : checked ? entry.type === "radio" ? <span className="hm-sw-viewer-menu__dot" /> : <CheckIcon /> : null}
+          </span>
+          <span className="hm-sw-viewer-menu__text">{entry.label}</span>
+          {entry.type === "item" && entry.shortcut && <span className="hm-sw-viewer-menu__shortcut">{entry.shortcut}</span>}
+        </button>
+      </div>
+    )
+  })
+
+  return (
+    <div ref={ref} id={id} role="menu" tabIndex={-1} aria-label={label} aria-orientation="vertical" className={`hm-sw-theme hm-sw-viewer-menu${className ? ` ${className}` : ""}`} data-surface={surface}
+      style={{ left: position?.left ?? 0, top: position?.top ?? 0, width, visibility: position ? undefined : "hidden" }}
+      onKeyDown={onKeyDown}>
+      {rows.length ? rows : <div role="presentation" className="hm-sw-viewer-menu__label">항목 없음</div>}
+    </div>
+  )
+}
+
+/**
+ * SW viewer dropdown (reference DWG/DXF viewer menu): fixed overlay below an anchor (or at a point), kept inside
+ * the viewport. Items, check / radio items, labels, separators and multi-level submenus come from `entries`.
+ * Keyboard: ArrowUp / ArrowDown / Home / End move, Enter / Space activate, ArrowRight / ArrowLeft open / close a
+ * submenu, Escape closes and returns focus to the anchor, Tab closes. A click outside closes.
+ */
+export function SWViewerMenu({ entries, open, onOpenChange, anchorRef, anchorPoint, align = "start", width, surface = "light", label, onEntrySelect, initialFocus = "first", id, className }: SWViewerMenuProps) {
+  const rootRef = useRef<HTMLDivElement>(null)
+  const changeRef = useRef(onOpenChange)
+  changeRef.current = onOpenChange
+  useEffect(() => {
+    if (!open) return
+    const onPointerDown = (event: PointerEvent) => {
+      const target = event.target as Node
+      if (rootRef.current?.contains(target) || anchorRef?.current?.contains(target)) return
+      changeRef.current(false)
+    }
+    document.addEventListener("pointerdown", onPointerDown, true)
+    return () => document.removeEventListener("pointerdown", onPointerDown, true)
+  }, [open, anchorRef])
+  if (!open) return null
+  const closeAll = (returnFocus: boolean) => {
+    onOpenChange(false)
+    if (returnFocus) anchorRef?.current?.focus()
+  }
+  const activate = (entry: SWViewerMenuEntry) => {
+    if (entry.type === "item" || entry.type === "radio") entry.onSelect?.()
+    else if (entry.type === "checkbox") entry.onCheckedChange?.(!entry.checked)
+    onEntrySelect?.(entry)
+    if (!("keepOpen" in entry && entry.keepOpen)) closeAll(true)
+  }
+  const place = (w: number, h: number) => {
+    const vw = document.documentElement.clientWidth, vh = window.innerHeight
+    const box = anchorPoint ? { left: anchorPoint.x, right: anchorPoint.x, top: anchorPoint.y, bottom: anchorPoint.y }
+      : anchorRef?.current?.getBoundingClientRect() ?? { left: 0, right: 0, top: 0, bottom: 0 }
+    const start = align === "end" ? box.right - w : box.left
+    const left = Math.max(4, Math.min(start, vw - w - 4))
+    // 4px under a button; exactly at the pointer for a context menu.
+    const gap = anchorPoint ? 0 : 4
+    const below = box.bottom + gap
+    const top = below + h > vh - 4 && box.top - h - gap >= 4 ? box.top - h - gap : Math.max(4, Math.min(below, vh - h - 4))
+    return { left, top }
+  }
+  return (
+    <div ref={rootRef} className="hm-sw-viewer-menu-root">
+      <MenuList entries={entries} surface={surface} width={width} label={label} place={place} activate={activate} closeAll={closeAll} autoFocus={initialFocus} id={id} className={className} />
+    </div>
+  )
+}
diff --git a/packages/sw/src/components/sw-viewer/SWViewerPanel.tsx b/packages/sw/src/components/sw-viewer/SWViewerPanel.tsx
new file mode 100644
index 0000000..8555c3d
--- /dev/null
+++ b/packages/sw/src/components/sw-viewer/SWViewerPanel.tsx
@@ -0,0 +1,236 @@
+import { useEffect, useId, useLayoutEffect, useRef, useState, type CSSProperties, type HTMLAttributes, type KeyboardEvent, type PointerEvent as ReactPointerEvent, type ReactNode } from "react"
+import "../../theme/sw-viewer.css"
+
+export type SWViewerPanelPlacement = "top-end" | "top-start" | "center"
+
+export interface SWViewerPanelProps extends Omit<HTMLAttributes<HTMLDivElement>, "title"> {
+  /** Title (14px 700 #FFC600, ellipsis). Also the accessible name. */
+  title: string
+  /** 16px title icon supplied by the program. */
+  icon?: ReactNode
+  /** Shown when true. Unmounted otherwise (no hidden DOM). */
+  open: boolean
+  /** Close button, and Escape while focus is inside the panel. */
+  onClose: () => void
+  closeLabel?: string
+  /** Extra title-bar buttons before collapse / close (use `SWViewerButton variant="ghost"`). */
+  headerActions?: ReactNode
+  /** Free body content: SWViewerSection / SWViewerField / lists / any component. The body scrolls. */
+  children?: ReactNode
+  /** Bottom button area (e.g. 취소 / 적용). Stays visible while the body scrolls. */
+  footer?: ReactNode
+  /** Initial size. Default 320 x 420 (reference panel). `height: "auto"` follows the content. */
+  width?: number
+  height?: number | "auto"
+  minWidth?: number
+  minHeight?: number
+  /** Initial position: a point, or a placement inside the bounds. Default `top-end`. */
+  defaultPosition?: { left: number; top: number } | SWViewerPanelPlacement
+  /** Placement insets in px. Default `{ top: 56, side: 24 }` (below the 52px viewer header). */
+  inset?: { top?: number; side?: number }
+  /** `fixed` (default): the viewport. `absolute`: the nearest positioned ancestor (embedded preview). */
+  strategy?: "fixed" | "absolute"
+  /** Drag by the title bar. Default true. */
+  draggable?: boolean
+  /** Corner grip resize (min / max size, kept inside the bounds). Default true. */
+  resizable?: boolean
+  /** Collapse button and title double click. Default true. */
+  collapsible?: boolean
+  defaultCollapsed?: boolean
+  collapsed?: boolean
+  onCollapsedChange?: (collapsed: boolean) => void
+  /** Dim backdrop, focus trap and centered default (input / confirm popups). Default false. */
+  modal?: boolean
+  /** Focus the panel when it opens; focus returns to the previous element when it closes. Default true. */
+  autoFocus?: boolean
+  onPositionChange?: (position: { left: number; top: number }) => void
+  /** After a corner resize. */
+  onSizeChange?: (size: { width: number; height: number }) => void
+}
+
+let topLayer = 30
+const EDGE = 10
+const INTERACTIVE = "button, input, select, textarea, a, label, [data-panel-no-drag]"
+
+const Chevron = ({ down }: { down: boolean }) => (
+  <svg viewBox="0 0 16 16" width="16" height="16" aria-hidden="true"><path d={down ? "M4 6l4 4 4-4" : "M6 4l4 4-4 4"} fill="none" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" strokeLinejoin="round" /></svg>
+)
+
+function bounds(element: HTMLElement | null, strategy: "fixed" | "absolute") {
+  const parent = strategy === "absolute" ? element?.offsetParent as HTMLElement | null : null
+  return parent ? { width: parent.clientWidth, height: parent.clientHeight } : { width: document.documentElement.clientWidth, height: window.innerHeight }
+}
+
+function clamp(left: number, top: number, element: HTMLElement, strategy: "fixed" | "absolute") {
+  const box = bounds(element, strategy)
+  return {
+    left: Math.round(Math.min(Math.max(left, EDGE), Math.max(EDGE, box.width - element.offsetWidth - EDGE))),
+    top: Math.round(Math.min(Math.max(top, EDGE), Math.max(EDGE, box.height - element.offsetHeight - EDGE))),
+  }
+}
+
+/**
+ * SW viewer popup / settings window (reference DWG/DXF viewer floating panel): #E0DACE body, 2px #897445 border,
+ * #221D13 title bar with #FFC600 title, collapse and the curved green close (#E40000 on hover). Non-modal by
+ * default: drag by the title bar, corner resize, collapse, stays inside the bounds, Escape inside closes, the
+ * last touched panel comes to the front. The frame is fixed; `children` / `footer` are free.
+ */
+export function SWViewerPanel({
+  title, icon, open, onClose, closeLabel = "닫기", headerActions, children, footer,
+  width = 320, height = 420, minWidth = 250, minHeight = 140, defaultPosition, inset, strategy = "fixed",
+  draggable = true, resizable = true, collapsible = true, defaultCollapsed = false, collapsed: collapsedProp, onCollapsedChange,
+  modal = false, autoFocus = true, onPositionChange, onSizeChange, className, style, onKeyDown, onPointerDownCapture, onFocusCapture, ...rest
+}: SWViewerPanelProps) {
+  const ref = useRef<HTMLDivElement>(null)
+  const titleId = useId()
+  const closeGradient = `hm-sw-viewer-close-${useId().replace(/:/g, "")}`
+  const [position, setPosition] = useState<{ left: number; top: number } | null>(null)
+  const [layer, setLayer] = useState(() => ++topLayer)
+  const [internalCollapsed, setInternalCollapsed] = useState(defaultCollapsed)
+  const collapsed = collapsible && (collapsedProp ?? internalCollapsed)
+  const drag = useRef<{ x: number; y: number; left: number; top: number } | null>(null)
+  // Size after a corner resize (null: the width / height props).
+  const [size, setSize] = useState<{ width: number; height: number } | null>(null)
+  const resize = useRef<{ x: number; y: number; width: number; height: number } | null>(null)
+  const positionRef = useRef(position)
+  positionRef.current = position
+  const placement = defaultPosition ?? (modal ? "center" : "top-end")
+
+  // Initial position, measured once per opening; then kept inside the bounds when they change.
+  useLayoutEffect(() => {
+    if (!open) { setPosition(null); setSize(null); return }
+    const panel = ref.current
+    if (!panel) return
+    const box = bounds(panel, strategy)
+    const top = inset?.top ?? 56, side = inset?.side ?? 24
+    const start = typeof placement === "object" ? placement
+      : placement === "center" ? { left: (box.width - panel.offsetWidth) / 2, top: (box.height - panel.offsetHeight) / 2 }
+        : { left: placement === "top-end" ? box.width - panel.offsetWidth - side : side, top }
+    setPosition(clamp(start.left, start.top, panel, strategy))
+    const keepInside = () => { const current = positionRef.current; if (current && ref.current) setPosition(clamp(current.left, current.top, ref.current, strategy)) }
+    window.addEventListener("resize", keepInside)
+    const parent = strategy === "absolute" ? panel.offsetParent : null
+    const observer = parent ? new ResizeObserver(keepInside) : null
+    if (parent) observer?.observe(parent)
+    return () => { window.removeEventListener("resize", keepInside); observer?.disconnect() }
+  }, [open])
+
+  // Focus in once positioned (a hidden panel cannot take focus), back to the opener on close.
+  const placed = position !== null
+  useEffect(() => {
+    if (!open || !autoFocus) return
+    const previous = document.activeElement as HTMLElement | null
+    return () => { if (previous?.isConnected) previous.focus({ preventScroll: true }) }
+  }, [open, autoFocus])
+  useEffect(() => {
+    if (open && autoFocus && placed && !ref.current?.contains(document.activeElement)) ref.current?.focus({ preventScroll: true })
+  }, [open, autoFocus, placed])
+
+  if (!open) return null
+  const raise = () => { if (layer !== topLayer) setLayer(++topLayer) }
+  const setCollapsed = (next: boolean) => { if (collapsedProp === undefined) setInternalCollapsed(next); onCollapsedChange?.(next) }
+
+  const onTitlePointerDown = (event: ReactPointerEvent<HTMLDivElement>) => {
+    if (!draggable || event.button !== 0 || (event.target as HTMLElement).closest(INTERACTIVE) || !ref.current || !position) return
+    drag.current = { x: event.clientX, y: event.clientY, left: position.left, top: position.top }
+    event.currentTarget.setPointerCapture(event.pointerId)
+    event.currentTarget.dataset.dragging = ""
+  }
+  const onTitlePointerMove = (event: ReactPointerEvent<HTMLDivElement>) => {
+    const start = drag.current
+    if (!start || !ref.current) return
+    setPosition(clamp(start.left + event.clientX - start.x, start.top + event.clientY - start.y, ref.current, strategy))
+  }
+  const onTitlePointerUp = (event: ReactPointerEvent<HTMLDivElement>) => {
+    if (!drag.current) return
+    drag.current = null
+    delete event.currentTarget.dataset.dragging
+    if (positionRef.current) onPositionChange?.(positionRef.current)
+  }
+  const onGripPointerDown = (event: ReactPointerEvent<HTMLDivElement>) => {
+    if (event.button !== 0 || !ref.current) return
+    event.preventDefault()
+    resize.current = { x: event.clientX, y: event.clientY, width: ref.current.offsetWidth, height: ref.current.offsetHeight }
+    event.currentTarget.setPointerCapture(event.pointerId)
+  }
+  const onGripPointerMove = (event: ReactPointerEvent<HTMLDivElement>) => {
+    const start = resize.current, panel = ref.current
+    if (!start || !panel || !position) return
+    const box = bounds(panel, strategy)
+    // Min size, 90% of the bounds, and never past the bounds edge (10px) from the current corner.
+    const maxWidth = Math.min(box.width * 0.9, box.width - position.left - EDGE), maxHeight = Math.min(box.height * 0.9, box.height - position.top - EDGE)
+    setSize({
+      width: Math.round(Math.max(minWidth, Math.min(maxWidth, start.width + event.clientX - start.x))),
+      height: Math.round(Math.max(minHeight, Math.min(maxHeight, start.height + event.clientY - start.y))),
+    })
+  }
+  const onGripPointerUp = () => {
+    if (!resize.current) return
+    resize.current = null
+    if (ref.current) onSizeChange?.({ width: ref.current.offsetWidth, height: ref.current.offsetHeight })
+  }
+  const onPanelKeyDown = (event: KeyboardEvent<HTMLDivElement>) => {
+    onKeyDown?.(event)
+    if (event.defaultPrevented || event.nativeEvent.isComposing) return
+    if (event.key === "Escape") { event.stopPropagation(); onClose(); return }
+    if (modal && event.key === "Tab" && ref.current) {
+      const focusables = Array.from(ref.current.querySelectorAll<HTMLElement>('button:not(:disabled), input:not(:disabled), select:not(:disabled), textarea:not(:disabled), a[href], [tabindex]:not([tabindex="-1"])'))
+      if (!focusables.length) { event.preventDefault(); return }
+      const first = focusables[0], last = focusables[focusables.length - 1]
+      if (event.shiftKey && (document.activeElement === first || document.activeElement === ref.current)) { event.preventDefault(); last.focus() }
+      else if (!event.shiftKey && document.activeElement === last) { event.preventDefault(); first.focus() }
+    }
+  }
+
+  const frameStyle: CSSProperties = {
+    position: strategy,
+    left: position?.left ?? 0,
+    top: position?.top ?? 0,
+    zIndex: layer,
+    width: size?.width ?? width,
+    height: collapsed || (height === "auto" && !size) ? "auto" : size?.height ?? height,
+    minWidth,
+    minHeight: collapsed ? undefined : Math.min(minHeight, typeof height === "number" ? height : minHeight),
+    visibility: position ? undefined : "hidden",
+    ...style,
+  }
+  const panel = (
+    <div ref={ref} role="dialog" aria-modal={modal} aria-labelledby={titleId} tabIndex={-1}
+      className={`hm-sw-theme hm-sw-viewer-panel${className ? ` ${className}` : ""}`} data-collapsed={collapsed || undefined} data-modal={modal || undefined}
+      style={frameStyle} {...rest}
+      onKeyDown={onPanelKeyDown}
+      onPointerDownCapture={event => { raise(); onPointerDownCapture?.(event) }}
+      onFocusCapture={event => { raise(); onFocusCapture?.(event) }}>
+      <div className="hm-sw-viewer-panel__titlebar" data-draggable={draggable || undefined}
+        onPointerDown={onTitlePointerDown} onPointerMove={onTitlePointerMove} onPointerUp={onTitlePointerUp} onPointerCancel={onTitlePointerUp}
+        onDoubleClick={event => { if (collapsible && !(event.target as HTMLElement).closest(INTERACTIVE)) setCollapsed(!collapsed) }}>
+        <h2 id={titleId} className="hm-sw-viewer-panel__title" title={title}>
+          {icon && <span className="hm-sw-viewer-panel__title-icon" aria-hidden="true">{icon}</span>}
+          <span className="hm-sw-viewer-panel__title-text">{title}</span>
+        </h2>
+        <div className="hm-sw-viewer-panel__actions">
+          {headerActions}
+          {collapsible && <button type="button" className="hm-sw-viewer-panel__icon-button" aria-label={collapsed ? "펼치기" : "접기"} title={collapsed ? "펼치기" : "접기"} aria-expanded={!collapsed} onClick={() => setCollapsed(!collapsed)}><Chevron down={!collapsed} /></button>}
+          <button type="button" className="hm-sw-viewer-panel__close" aria-label={closeLabel} title={closeLabel} onClick={onClose}>
+            <svg className="hm-sw-viewer-panel__close-shape" viewBox="0 0 52 34" preserveAspectRatio="none" aria-hidden="true" focusable="false">
+              <defs>
+                <radialGradient id={closeGradient} cx="55%" cy="30%" r="85%">
+                  <stop offset="0%" stopColor="var(--hm-sw-viewer-close-glow)" />
+                  <stop offset="100%" stopColor="var(--hm-sw-viewer-close-edge)" />
+                </radialGradient>
+              </defs>
+              <path d="M 0 0 C 12 0 14 34 26 34 H 52 V 0 Z" fill={`url(#${closeGradient})`} />
+              <path className="hm-sw-viewer-panel__close-curve" d="M 0 0 C 12 0 14 34 26 34" fill="none" vectorEffect="non-scaling-stroke" />
+            </svg>
+            <svg className="hm-sw-viewer-panel__close-icon" viewBox="0 0 24 24" width="16" height="16" aria-hidden="true"><path d="M18 6L6 18M6 6l12 12" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" /></svg>
+          </button>
+        </div>
+      </div>
+      {!collapsed && <div className="hm-sw-viewer-panel__body">{children}</div>}
+      {!collapsed && footer && <div className="hm-sw-viewer-panel__footer">{footer}</div>}
+      {resizable && !collapsed && <div className="hm-sw-viewer-panel__resize" aria-hidden="true" data-panel-no-drag=""
+        onPointerDown={onGripPointerDown} onPointerMove={onGripPointerMove} onPointerUp={onGripPointerUp} onPointerCancel={onGripPointerUp} />}
+    </div>
+  )
+  return modal ? <><div className="hm-sw-viewer-panel-backdrop" style={{ position: strategy, zIndex: layer }} aria-hidden="true" />{panel}</> : panel
+}
diff --git a/packages/sw/src/components/sw-viewer/index.ts b/packages/sw/src/components/sw-viewer/index.ts
new file mode 100644
index 0000000..2f8538d
--- /dev/null
+++ b/packages/sw/src/components/sw-viewer/index.ts
@@ -0,0 +1,9 @@
+export { SWViewerHeader, SWViewerHeaderButton, type SWViewerHeaderProps, type SWViewerHeaderButtonProps } from "./SWViewerHeader"
+export { SWViewerMenu, type SWViewerMenuProps } from "./SWViewerMenu"
+export { SWViewerPanel, type SWViewerPanelProps, type SWViewerPanelPlacement } from "./SWViewerPanel"
+export {
+  SWViewerSection, SWViewerField, SWViewerHint, SWViewerSwitch, SWViewerSlider, SWViewerInput, SWViewerButton, SWViewerBadge, SWViewerStatus,
+  type SWViewerSectionProps, type SWViewerFieldProps, type SWViewerSwitchProps, type SWViewerSliderProps, type SWViewerInputProps,
+  type SWViewerButtonProps, type SWViewerBadgeProps, type SWViewerStatusProps, type SWViewerStatusState,
+} from "./SWViewerControls"
+export type { SWViewerHeaderItem, SWViewerHeaderGroup, SWViewerMenuEntry, SWViewerCommand } from "./types"
diff --git a/packages/sw/src/components/sw-viewer/types.ts b/packages/sw/src/components/sw-viewer/types.ts
new file mode 100644
index 0000000..ae5aecd
--- /dev/null
+++ b/packages/sw/src/components/sw-viewer/types.ts
@@ -0,0 +1,131 @@
+import type { ReactNode } from "react"
+
+/** One entry of an SW viewer dropdown (header menu, More, context menu). Data only: the host runs the command. */
+export type SWViewerMenuEntry =
+  | {
+    type: "item"
+    id: string
+    label: string
+    /** 16px icon supplied by the program. */
+    icon?: ReactNode
+    /** Right-aligned hint, e.g. `F`. */
+    shortcut?: string
+    disabled?: boolean
+    hidden?: boolean
+    /** Keep the menu open after selecting. Default false. */
+    keepOpen?: boolean
+    onSelect?: () => void
+  }
+  | {
+    type: "checkbox"
+    id: string
+    label: string
+    checked: boolean
+    disabled?: boolean
+    hidden?: boolean
+    keepOpen?: boolean
+    onCheckedChange?: (checked: boolean) => void
+  }
+  | {
+    type: "radio"
+    id: string
+    label: string
+    checked: boolean
+    disabled?: boolean
+    hidden?: boolean
+    keepOpen?: boolean
+    onSelect?: () => void
+  }
+  | {
+    /** Multi-level menu: opens to the side (hover, Enter / Space / ArrowRight; ArrowLeft closes). */
+    type: "submenu"
+    id: string
+    label: string
+    icon?: ReactNode
+    disabled?: boolean
+    hidden?: boolean
+    entries: SWViewerMenuEntry[]
+  }
+  | { type: "label"; id: string; label: string; hidden?: boolean }
+  | { type: "separator"; id: string; hidden?: boolean }
+
+/** Command event of SWViewerHeader / SWViewerMenu: the one place a program wires every menu action. */
+export interface SWViewerCommand {
+  /** Header item id, or menu entry id for dropdown entries. */
+  id: string
+  /** Header item that owns the command (equals `id` for header buttons, toggles, tabs, switches). */
+  itemId: string
+  /** New state: `pressed` / `checked` (boolean) or the selected tab value (string). */
+  value?: boolean | string
+}
+
+interface SWViewerHeaderItemBase {
+  id: string
+  /** Visible text; also the accessible name (icon-only buttons keep it as aria-label). */
+  label: string
+  /** 16px icon supplied by the program. */
+  icon?: ReactNode
+  /** Tooltip (title attribute). */
+  title?: string
+  disabled?: boolean
+  /** Removed from the header and from More. */
+  hidden?: boolean
+  /** Header width (px) below which the item moves into the More dropdown. */
+  collapseBelow?: number
+  /** Header width (px) below which only the icon is shown (label kept as the accessible name). */
+  iconOnlyBelow?: number
+  /** Always icon only (e.g. the info button). Needs `icon`. */
+  iconOnly?: boolean
+  /** Section title of this item inside More (menu and tabs items only). Default `label`. */
+  moreLabel?: string
+}
+
+export type SWViewerHeaderItem =
+  | (SWViewerHeaderItemBase & { type: "button"; onSelect?: () => void })
+  | (SWViewerHeaderItemBase & { type: "toggle"; pressed: boolean; onPressedChange?: (pressed: boolean) => void })
+  | (SWViewerHeaderItemBase & {
+    /** Button with a dropdown (chevron). */
+    type: "menu"
+    entries: SWViewerMenuEntry[]
+    /** Dropdown width in px. Default: its content (min 160). */
+    menuWidth?: number
+    /** Dropdown edge aligned to the button. Default `start`. */
+    menuAlign?: "start" | "end"
+  })
+  | (SWViewerHeaderItemBase & {
+    /** Single selection such as Model / Layout (radiogroup, arrow keys move). */
+    type: "tabs"
+    value: string | null
+    options: { value: string; label: string; count?: number; title?: string; disabled?: boolean }[]
+    onValueChange?: (value: string) => void
+  })
+  | (SWViewerHeaderItemBase & {
+    /** Caption above a switch, e.g. 2.5D. */
+    type: "switch"
+    checked: boolean
+    onCheckedChange?: (checked: boolean) => void
+  })
+  | {
+    /** Free content in the header (program-specific control). */
+    type: "custom"
+    id: string
+    hidden?: boolean
+    collapseBelow?: number
+    render: () => ReactNode
+    /** How the item appears in More once collapsed. Default: not shown there. */
+    menuEntries?: SWViewerMenuEntry[]
+  }
+
+export interface SWViewerHeaderGroup {
+  id: string
+  /** Accessible group name. Also the More section title of its buttons, toggles and switches. */
+  label: string
+  /** More section title when it differs from `label`. */
+  moreLabel?: string
+  /** `plain` (default): no face. `field`: the inset dark property surface (user-confirmed values). */
+  surface?: "plain" | "field"
+  /** `end`: the trailing action area at the right end of the object surface. Default `start`. */
+  placement?: "start" | "end"
+  hidden?: boolean
+  items: SWViewerHeaderItem[]
+}
diff --git a/packages/sw/src/index.ts b/packages/sw/src/index.ts
index 794042d..a26dd7d 100644
--- a/packages/sw/src/index.ts
+++ b/packages/sw/src/index.ts
@@ -10,3 +10,6 @@ export {
   SWPopup, SWPopupSection, SWPopupRow,
   type SWPopupProps, type SWPopupSectionProps, type SWPopupRowProps,
 } from "./components/sw-popup/SWPopup"
+
+// SW viewer mode (2026-10-19): viewer header, dropdown, popup panel and panel controls.
+export * from "./components/sw-viewer"
diff --git a/packages/sw/src/theme/sw-viewer.css b/packages/sw/src/theme/sw-viewer.css
new file mode 100644
index 0000000..41b2e22
--- /dev/null
+++ b/packages/sw/src/theme/sw-viewer.css
@@ -0,0 +1,549 @@
+/* @hm-design/sw — SW viewer mode (reference: DWG/DXF viewer top menu and floating panels, measured 2026-10-19).
+   Viewer-only tokens. The three header surfaces reuse the user-confirmed SW tokens of sw.css
+   (--hm-sw-header-document-* / object-* / property-*). Never touches global selectors or the SWHeader. */
+
+.hm-sw-header,
+.hm-sw-theme {
+  /* Header */
+  --hm-sw-viewer-height: 52px;
+  --hm-sw-viewer-background: linear-gradient(180deg, #266651 0%, #123328 45%, #0a221d 100%);
+  --hm-sw-viewer-border-color: #071e18;
+  --hm-sw-viewer-brand-width: 72px;
+  /* No logo: no text or icon is drawn; the cap keeps only its slanted edge (no wide empty space). */
+  --hm-sw-viewer-brand-empty-width: 24px;
+  --hm-sw-viewer-brand-top: #123328;
+  --hm-sw-viewer-brand-middle: #205241;
+  --hm-sw-viewer-brand-bottom: #071e18;
+  --hm-sw-viewer-text: #fff;
+  --hm-sw-viewer-muted: #bddfd4;
+  --hm-sw-viewer-accent: #ffc600;
+  --hm-sw-viewer-hover: #266651;
+  --hm-sw-viewer-gap: 4px;
+  --hm-sw-viewer-radius: 4px;
+  --hm-sw-viewer-control-height: 40px;
+  --hm-sw-viewer-button-height: 34px;
+  --hm-sw-viewer-font-size: 14px;
+  --hm-sw-viewer-label-size: 11px;
+  --hm-sw-viewer-icon-size: 16px;
+  --hm-sw-viewer-disabled-opacity: 0.6;
+  --hm-sw-viewer-switch-off: #0a221d;
+  --hm-sw-viewer-switch-bevel: inset 0 1px 0 rgba(255, 255, 255, 0.1), inset 0 -1px 1px rgba(0, 0, 0, 0.25);
+  /* Icon stroke: the SWHeader icon assets (print / K guide / layer icons) are a fill + a 1px black OUTSIDE stroke
+     (Figma mask "outside" path) + a 0-offset glow (stdDeviation 1.615, #061A14). Program icons are free SVGs, so the
+     same stroke is a drop-shadow chain that follows the icon's own contour: the four 1px shadows dilate the shape
+     by 1px (each one also shadows the previous ones, so corners close), the last one is the glow. */
+  --hm-sw-viewer-icon-outline-color: var(--hm-sw-header-text-outline-color);
+  --hm-sw-viewer-icon-glow: #061a14;
+  --hm-sw-viewer-icon-outline:
+    drop-shadow(1px 0 0 var(--hm-sw-viewer-icon-outline-color)) drop-shadow(-1px 0 0 var(--hm-sw-viewer-icon-outline-color))
+    drop-shadow(0 1px 0 var(--hm-sw-viewer-icon-outline-color)) drop-shadow(0 -1px 0 var(--hm-sw-viewer-icon-outline-color))
+    drop-shadow(0 0 1.615px var(--hm-sw-viewer-icon-glow));
+
+  /* Dropdown (light) and More (beige) */
+  --hm-sw-viewer-menu-background: #fff;
+  --hm-sw-viewer-menu-border-color: #dedbd2;
+  --hm-sw-viewer-menu-text: #0a221d;
+  --hm-sw-viewer-menu-muted: #6e6759;
+  --hm-sw-viewer-menu-highlight: rgba(189, 223, 212, 0.45);
+  --hm-sw-viewer-menu-highlight-text: #123328;
+  --hm-sw-viewer-menu-shadow: 0 0 12px rgba(0, 0, 0, 0.2);
+  --hm-sw-viewer-menu-item-height: 36px;
+  --hm-sw-viewer-more-background: #f5f0e5;
+  --hm-sw-viewer-more-border-color: #897445;
+
+  /* Panel */
+  --hm-sw-viewer-panel-background: #e0dace;
+  --hm-sw-viewer-panel-field-background: #f5f0e5;
+  --hm-sw-viewer-panel-border: #897445;
+  --hm-sw-viewer-panel-inner-border: #9a9284;
+  --hm-sw-viewer-panel-title-background: #221d13;
+  --hm-sw-viewer-panel-title-highlight: #a98d53;
+  --hm-sw-viewer-panel-title-color: #ffc600;
+  --hm-sw-viewer-panel-title-button-hover: #604f32;
+  --hm-sw-viewer-panel-text: #1d1810;
+  --hm-sw-viewer-panel-heading: #3e3523;
+  --hm-sw-viewer-panel-label: #6e6759;
+  --hm-sw-viewer-panel-spacing: 12px;
+  --hm-sw-viewer-panel-title-height: 34px;
+  --hm-sw-viewer-panel-shadow: 0 0 12px rgba(0, 0, 0, 0.2);
+  --hm-sw-viewer-panel-primary: #123328;
+  --hm-sw-viewer-panel-switch-off: #9a9284;
+  --hm-sw-viewer-panel-switch-on: #266651;
+  --hm-sw-viewer-panel-badge-background: #f4f1ea;
+  --hm-sw-viewer-panel-overlay: rgba(0, 0, 0, 0.1);
+  /* Close: green curve, #E40000 on hover (user-supplied reference value). */
+  --hm-sw-viewer-close-glow: #123328;
+  --hm-sw-viewer-close-edge: #020a07;
+  --hm-sw-viewer-close-hover: #e40000;
+  --hm-sw-viewer-close-icon: #999;
+}
+
+.hm-sw-viewer-sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
+
+/* ---------- Header ---------- */
+.hm-sw-viewer-header {
+  container: hm-sw-viewer / inline-size;
+  position: relative;
+  box-sizing: border-box;
+  display: flex;
+  align-items: flex-start;
+  gap: 2px;
+  width: 100%;
+  min-width: 0;
+  height: var(--hm-sw-viewer-height);
+  border: 1px solid var(--hm-sw-viewer-border-color);
+  background: var(--hm-sw-viewer-background);
+  color: var(--hm-sw-viewer-text);
+  font-size: var(--hm-sw-viewer-font-size);
+  font-weight: 500;
+  line-height: 20px;
+}
+
+.hm-sw-viewer-header__brand {
+  position: relative;
+  z-index: 2;
+  display: flex;
+  align-items: center;
+  flex: 0 0 auto;
+  width: var(--hm-sw-viewer-brand-empty-width);
+  height: calc(var(--hm-sw-viewer-height) - 2px);
+  margin-right: -2px;
+  font-weight: 700;
+}
+/* With a logo: the reference 72px cap (logo at 24px), wider only for a wider logo. Without: the slanted edge only. */
+.hm-sw-viewer-header__brand[data-logo] { width: auto; min-width: var(--hm-sw-viewer-brand-width); padding: 0 25px 0 24px; }
+button.hm-sw-viewer-header__brand { text-align: left; }
+.hm-sw-viewer-header__brand-shape { position: absolute; inset: 0 auto 0 0; width: calc(100% + 16px); height: 100%; pointer-events: none; }
+.hm-sw-viewer-header__brand-mark { position: relative; display: inline-flex; align-items: center; }
+.hm-sw-viewer-header__brand-mark > :is(img, svg) { display: block; max-height: 24px; width: auto; }
+
+.hm-sw-viewer-header__document {
+  display: flex;
+  align-items: center;
+  flex: 0 1 clamp(140px, 25cqw, 360px);
+  width: clamp(220px, 25cqw, 360px);
+  min-width: 56px;
+  height: calc(var(--hm-sw-viewer-height) - 2px);
+  padding: 0 16px 0 24px;
+  border: 1px solid var(--hm-sw-header-document-border-color);
+  border-left: 0;
+  background: var(--hm-sw-header-document-background);
+}
+.hm-sw-viewer-header__document-name { min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
+
+.hm-sw-viewer-header__object {
+  display: flex;
+  align-items: center;
+  flex: 1 0 auto;
+  min-width: 0;
+  height: calc(var(--hm-sw-viewer-height) - 2px);
+  gap: var(--hm-sw-viewer-gap);
+  padding-inline: var(--hm-sw-viewer-gap);
+  border: 1px solid var(--hm-sw-header-object-border-color);
+  border-radius: var(--hm-sw-header-object-radius);
+  background: var(--hm-sw-header-object-background);
+}
+
+.hm-sw-viewer-header__group {
+  display: flex;
+  align-items: center;
+  gap: var(--hm-sw-viewer-gap);
+  min-height: var(--hm-sw-viewer-control-height);
+  padding-inline: var(--hm-sw-viewer-gap);
+}
+.hm-sw-viewer-header__group[data-surface="field"] {
+  border: 1px solid var(--hm-sw-header-property-border-color);
+  border-radius: var(--hm-sw-header-property-radius);
+  background: var(--hm-sw-header-property-background);
+  box-shadow: var(--hm-sw-header-property-shadow);
+}
+.hm-sw-viewer-header__actions {
+  display: flex;
+  align-items: center;
+  align-self: stretch;
+  gap: var(--hm-sw-viewer-gap);
+  margin-left: auto;
+  padding-left: 6px;
+}
+
+/* Buttons, menu buttons and toggles: transparent, #266651 hover, #FFC600 pressed / open / on (no selected box). */
+.hm-sw-viewer-header .hm-sw-viewer-header__button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  gap: 8px;
+  height: var(--hm-sw-viewer-button-height);
+  padding: 6px 14px;
+  border: 1px solid transparent;
+  border-radius: var(--hm-sw-viewer-radius);
+  color: var(--hm-sw-viewer-text);
+  font-weight: 500;
+  line-height: 20px;
+  white-space: nowrap;
+}
+.hm-sw-viewer-header .hm-sw-viewer-header__button[data-kind="toggle"] { height: var(--hm-sw-viewer-control-height); padding: 0 8px; }
+.hm-sw-viewer-header .hm-sw-viewer-header__button[data-icon-only] { min-width: var(--hm-sw-viewer-button-height); padding: 0 8px; }
+/* Always-icon buttons (info, More): the reference 32 x 40 icon button. */
+.hm-sw-viewer-header .hm-sw-viewer-header__button[data-icon-only="always"] { min-width: 32px; width: 32px; height: var(--hm-sw-viewer-control-height); padding: 0 8px; }
+.hm-sw-viewer-header .hm-sw-viewer-header__button:hover:not(:disabled) { background: var(--hm-sw-viewer-hover); }
+.hm-sw-viewer-header .hm-sw-viewer-header__button:active:not(:disabled),
+.hm-sw-viewer-header .hm-sw-viewer-header__button:is([data-state="open"], [data-state="on"]) { color: var(--hm-sw-viewer-accent); }
+.hm-sw-viewer-header .hm-sw-viewer-header__button:is([data-state="open"], [data-state="on"]):not(:hover) { background: transparent; }
+.hm-sw-viewer-header :is(.hm-sw-viewer-header__button, .hm-sw-viewer-header__tab):disabled { opacity: var(--hm-sw-viewer-disabled-opacity); cursor: not-allowed; }
+.hm-sw-viewer-header__icon, .hm-sw-viewer-header__chevron { display: inline-flex; width: var(--hm-sw-viewer-icon-size); height: var(--hm-sw-viewer-icon-size); }
+.hm-sw-viewer-header__icon > svg, .hm-sw-viewer-header__chevron > svg { width: 100%; height: 100%; }
+
+/* Tabs (Model / Layout): 40px triggers with an 11px count; the active one turns #FFC600. */
+.hm-sw-viewer-header__tabs { display: flex; align-items: center; gap: var(--hm-sw-viewer-gap); }
+.hm-sw-viewer-header .hm-sw-viewer-header__tab {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--hm-sw-viewer-gap);
+  height: var(--hm-sw-viewer-control-height);
+  padding: 0 8px;
+  border: 1px solid transparent;
+  border-radius: var(--hm-sw-viewer-radius);
+  color: var(--hm-sw-viewer-text);
+  font-weight: 500;
+  line-height: 1.4;
+  white-space: nowrap;
+}
+.hm-sw-viewer-header .hm-sw-viewer-header__tab:hover:not(:disabled) { background: var(--hm-sw-viewer-hover); }
+.hm-sw-viewer-header .hm-sw-viewer-header__tab[data-state="active"] { color: var(--hm-sw-viewer-accent); }
+.hm-sw-viewer-header__count { font-size: var(--hm-sw-viewer-label-size); font-weight: 400; font-variant-numeric: tabular-nums; }
+
+/* Switch fields (2.5D, 어두운 배경): 11px muted caption above the switch. */
+.hm-sw-viewer-header__switch-field {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: var(--hm-sw-viewer-gap);
+  min-height: var(--hm-sw-viewer-control-height);
+  padding-inline: 8px;
+}
+.hm-sw-viewer-header__switch-label { color: var(--hm-sw-viewer-muted); font-size: var(--hm-sw-viewer-label-size); font-weight: 400; line-height: 1; white-space: nowrap; }
+
+.hm-sw-viewer-header :is(.hm-sw-viewer-header__button, .hm-sw-viewer-header__tab, .hm-sw-viewer-header__brand, .hm-sw-viewer-switch):focus-visible {
+  outline: 2px solid var(--hm-sw-viewer-accent);
+  outline-offset: 2px;
+}
+
+/* Text and icon stroke (2026-10-19 request): the SWHeader black outline on the viewer header, same tokens and
+   method — an outside outline of the glyph / icon shape, never a box border.
+   Text: 14px = --hm-sw-header-text-outline (1.3px black), 11px captions / counts / status = --hm-sw-header-label-outline
+   (1px black), as SWHeader's 12px labels. Icons: --hm-sw-viewer-icon-outline (see the token). Fill color, size,
+   weight and spacing are unchanged; hover / active / open change only the fill, disabled fades the whole button
+   (opacity) like SWHeader. Dropdown faces (light / beige) and panels get no outline, like SWHeader's More menu. */
+.hm-sw-viewer-header :is(
+  .hm-sw-viewer-header__brand-mark, .hm-sw-viewer-header__document-name, .hm-sw-viewer-header__label, .hm-sw-viewer-header__tab
+) {
+  text-shadow: var(--hm-sw-header-text-outline);
+}
+.hm-sw-viewer-header :is(.hm-sw-viewer-header__count, .hm-sw-viewer-header__switch-label, .hm-sw-viewer-status__label) {
+  text-shadow: var(--hm-sw-header-label-outline);
+}
+.hm-sw-viewer-header :is(.hm-sw-viewer-header__icon, .hm-sw-viewer-header__chevron, .hm-sw-viewer-status > svg) {
+  filter: var(--hm-sw-viewer-icon-outline);
+}
+/* Clipped (ellipsis) file name: the outline may paint 2px outside the box instead of being cut. */
+.hm-sw-viewer-header .hm-sw-viewer-header__document-name {
+  overflow: clip;
+  overflow-clip-margin: var(--hm-sw-header-text-outline-room);
+}
+
+/* Status */
+.hm-sw-viewer-status {
+  display: flex;
+  align-items: center;
+  gap: var(--hm-sw-viewer-gap);
+  padding-inline: 8px;
+  color: var(--hm-sw-viewer-muted);
+  font-size: var(--hm-sw-viewer-label-size);
+  font-weight: 400;
+  white-space: nowrap;
+}
+.hm-sw-viewer-status > svg { width: var(--hm-sw-viewer-icon-size); height: var(--hm-sw-viewer-icon-size); }
+.hm-sw-viewer-status[data-state="error"] { color: var(--hm-sw-viewer-accent); }
+.hm-sw-viewer-status__spin { animation: hm-sw-viewer-spin 1s linear infinite; }
+@keyframes hm-sw-viewer-spin { to { transform: rotate(360deg); } }
+@media (prefers-reduced-motion: reduce) { .hm-sw-viewer-status__spin { animation: none; } }
+
+/* Narrow header (reference breakpoints, measured on the header itself). */
+@container hm-sw-viewer (max-width: 1179.98px) {
+  .hm-sw-viewer-header__object { gap: 2px; padding-inline: 2px; }
+  .hm-sw-viewer-header__group { gap: 2px; padding-inline: 2px; }
+  .hm-sw-viewer-header__actions { padding-left: 2px; gap: 2px; }
+  .hm-sw-viewer-status { padding-inline: 2px; }
+}
+@container hm-sw-viewer (max-width: 559.98px) {
+  .hm-sw-viewer-header__document { padding-right: 8px; }
+  .hm-sw-viewer-status__label { display: none; }
+}
+
+/* ---------- Switch (header / panel faces) ---------- */
+.hm-sw-theme .hm-sw-viewer-switch {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  flex-shrink: 0;
+  width: 36px;
+  height: 20px;
+  padding: 2px;
+  border-radius: 9999px;
+  background: var(--hm-sw-viewer-switch-off);
+  box-shadow: var(--hm-sw-viewer-switch-bevel);
+  transition: background-color 0.15s;
+}
+.hm-sw-viewer-switch__thumb { display: block; width: 16px; height: 16px; border-radius: 9999px; background: var(--hm-sw-viewer-text); transition: transform 0.15s; }
+.hm-sw-viewer-switch[data-state="checked"] { background: var(--hm-sw-viewer-accent); }
+.hm-sw-viewer-switch[data-state="checked"] .hm-sw-viewer-switch__thumb { transform: translateX(16px); background: var(--hm-sw-viewer-switch-off); }
+.hm-sw-theme .hm-sw-viewer-switch:disabled { opacity: var(--hm-sw-viewer-disabled-opacity); cursor: not-allowed; }
+.hm-sw-viewer-panel .hm-sw-viewer-switch { background: var(--hm-sw-viewer-panel-switch-off); box-shadow: none; }
+.hm-sw-viewer-panel .hm-sw-viewer-switch .hm-sw-viewer-switch__thumb { background: #fff; }
+.hm-sw-viewer-panel .hm-sw-viewer-switch[data-state="checked"] { background: var(--hm-sw-viewer-panel-switch-on); }
+@media (prefers-reduced-motion: reduce) { .hm-sw-viewer-switch, .hm-sw-viewer-switch__thumb { transition: none; } }
+
+/* ---------- Dropdown ---------- */
+.hm-sw-viewer-menu {
+  position: fixed;
+  z-index: 60;
+  display: flex;
+  flex-direction: column;
+  min-width: 160px;
+  max-width: calc(100vw - 8px);
+  max-height: min(640px, calc(100dvh - 8px));
+  overflow-y: auto;
+  padding: 4px;
+  border: 1px solid var(--hm-sw-viewer-menu-border-color);
+  border-radius: var(--hm-sw-viewer-radius);
+  background: var(--hm-sw-viewer-menu-background);
+  box-shadow: var(--hm-sw-viewer-menu-shadow);
+  color: var(--hm-sw-viewer-menu-text);
+  font-size: 14px;
+  font-weight: 400;
+  line-height: 20px;
+  outline: none;
+}
+.hm-sw-viewer-menu[data-surface="beige"] { background: var(--hm-sw-viewer-more-background); border-color: var(--hm-sw-viewer-more-border-color); }
+.hm-sw-viewer-menu .hm-sw-viewer-menu__item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  width: 100%;
+  min-height: var(--hm-sw-viewer-menu-item-height);
+  padding: 0 12px;
+  border-radius: 2px;
+  color: inherit;
+  text-align: left;
+  white-space: nowrap;
+  outline: none;
+}
+.hm-sw-viewer-menu .hm-sw-viewer-menu__item:is(:focus, :hover, [data-state="open"]):not([aria-disabled]) { background: var(--hm-sw-viewer-menu-highlight); color: var(--hm-sw-viewer-menu-highlight-text); }
+.hm-sw-viewer-menu .hm-sw-viewer-menu__item[aria-disabled] { opacity: 0.5; cursor: not-allowed; }
+.hm-sw-viewer-menu .hm-sw-viewer-menu__item:focus-visible { outline: none; }
+.hm-sw-viewer-menu__icon { display: inline-flex; align-items: center; justify-content: center; flex: 0 0 16px; width: 16px; height: 16px; }
+.hm-sw-viewer-menu__icon:empty { display: none; }
+.hm-sw-viewer-menu__item[role="menuitemcheckbox"] .hm-sw-viewer-menu__icon,
+.hm-sw-viewer-menu__item[role="menuitemradio"] .hm-sw-viewer-menu__icon { display: inline-flex; }
+.hm-sw-viewer-menu__icon > svg { width: 16px; height: 16px; }
+.hm-sw-viewer-menu__dot { width: 8px; height: 8px; border-radius: 9999px; background: currentColor; }
+.hm-sw-viewer-menu__text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
+.hm-sw-viewer-menu__shortcut { margin-left: auto; color: var(--hm-sw-viewer-menu-muted); font-size: 12px; letter-spacing: 0.05em; }
+.hm-sw-viewer-menu__chevron { display: inline-flex; margin-left: auto; color: var(--hm-sw-viewer-menu-muted); }
+.hm-sw-viewer-menu__label { padding: 6px 12px; color: var(--hm-sw-viewer-menu-muted); font-size: 12px; font-weight: 500; line-height: 18px; }
+.hm-sw-viewer-menu__separator { flex: 0 0 1px; height: 1px; margin: 4px -4px; background: var(--hm-sw-viewer-menu-border-color); }
+.hm-sw-viewer-menu[data-surface="beige"] .hm-sw-viewer-menu__separator { background: var(--hm-sw-viewer-panel-inner-border); }
+
+/* ---------- Panel ---------- */
+.hm-sw-viewer-panel {
+  display: flex;
+  flex-direction: column;
+  max-width: 90vw;
+  max-height: 90vh;
+  overflow: hidden;
+  border: 2px solid var(--hm-sw-viewer-panel-border);
+  border-radius: var(--hm-sw-viewer-radius);
+  background: var(--hm-sw-viewer-panel-background);
+  box-shadow: var(--hm-sw-viewer-panel-shadow), inset 0 0 0 1px var(--hm-sw-viewer-panel-field-background);
+  color: var(--hm-sw-viewer-panel-text);
+  font-size: 14px;
+  font-weight: 400;
+  line-height: 20px;
+  outline: none;
+}
+.hm-sw-viewer-panel-backdrop { inset: 0; background: var(--hm-sw-viewer-panel-overlay); }
+.hm-sw-viewer-panel__titlebar {
+  display: flex;
+  flex-shrink: 0;
+  align-items: center;
+  gap: 4px;
+  min-height: var(--hm-sw-viewer-panel-title-height);
+  padding-left: var(--hm-sw-viewer-panel-spacing);
+  border-bottom: 1px solid var(--hm-sw-viewer-panel-border);
+  background: var(--hm-sw-viewer-panel-title-background);
+  box-shadow: inset 0 1px 0 var(--hm-sw-viewer-panel-title-highlight);
+  user-select: none;
+}
+.hm-sw-viewer-panel__titlebar[data-draggable] { cursor: grab; touch-action: none; }
+.hm-sw-viewer-panel__titlebar[data-dragging] { cursor: grabbing; }
+.hm-sw-viewer-panel__title {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex: 1;
+  min-width: 0;
+  margin: 0;
+  color: var(--hm-sw-viewer-panel-title-color);
+  font-size: 14px;
+  font-weight: 700;
+  line-height: 1.4;
+}
+.hm-sw-viewer-panel__title-icon { display: inline-flex; flex: 0 0 16px; width: 16px; height: 16px; }
+.hm-sw-viewer-panel__title-icon > svg { width: 100%; height: 100%; }
+.hm-sw-viewer-panel__title-text { min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
+.hm-sw-viewer-panel__actions { display: flex; flex-shrink: 0; align-items: center; }
+.hm-sw-viewer-panel :is(.hm-sw-viewer-panel__icon-button, .hm-sw-viewer-button[data-variant="ghost"]) {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: var(--hm-sw-viewer-panel-title-height);
+  height: var(--hm-sw-viewer-panel-title-height);
+  padding: 0;
+  border: 0;
+  border-radius: 0;
+  background: transparent;
+  color: var(--hm-sw-viewer-muted);
+}
+.hm-sw-viewer-panel :is(.hm-sw-viewer-panel__icon-button, .hm-sw-viewer-button[data-variant="ghost"]):hover:not(:disabled) { background: var(--hm-sw-viewer-panel-title-button-hover); color: var(--hm-sw-viewer-panel-title-color); }
+.hm-sw-viewer-panel :is(.hm-sw-viewer-panel__icon-button, .hm-sw-viewer-button[data-variant="ghost"], .hm-sw-viewer-panel__close):focus-visible { outline: 2px solid var(--hm-sw-viewer-panel-title-color); outline-offset: -3px; }
+.hm-sw-viewer-panel .hm-sw-viewer-panel__close {
+  position: relative;
+  isolation: isolate;
+  display: inline-flex;
+  align-items: center;
+  flex-shrink: 0;
+  width: calc(var(--hm-sw-viewer-panel-title-height) * 1.53);
+  height: var(--hm-sw-viewer-panel-title-height);
+  padding: 0 0 0 calc(var(--hm-sw-viewer-panel-title-height) * 0.7);
+  overflow: hidden;
+  color: var(--hm-sw-viewer-close-icon);
+}
+.hm-sw-viewer-panel__close-shape { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
+.hm-sw-viewer-panel__close-curve { stroke: var(--hm-sw-viewer-panel-border); stroke-width: 1; }
+.hm-sw-viewer-panel__close-icon { position: relative; width: 16px; height: 16px; pointer-events: none; }
+.hm-sw-viewer-panel .hm-sw-viewer-panel__close:focus-visible { --hm-sw-viewer-close-glow: #266651; color: #fff; }
+.hm-sw-viewer-panel .hm-sw-viewer-panel__close:is(:hover, :active) { --hm-sw-viewer-close-glow: var(--hm-sw-viewer-close-hover); --hm-sw-viewer-close-edge: var(--hm-sw-viewer-close-hover); color: #fff; }
+.hm-sw-viewer-panel__body {
+  display: flex;
+  flex-direction: column;
+  gap: 20px;
+  flex: 1;
+  min-height: 0;
+  overflow: auto;
+  overscroll-behavior: contain;
+  padding: var(--hm-sw-viewer-panel-spacing);
+  scrollbar-width: thin;
+  scrollbar-color: var(--hm-sw-viewer-panel-inner-border) var(--hm-sw-viewer-panel-background);
+}
+.hm-sw-viewer-panel__footer {
+  display: flex;
+  flex-shrink: 0;
+  justify-content: flex-end;
+  gap: 8px;
+  padding: 8px var(--hm-sw-viewer-panel-spacing);
+  border-top: 1px solid var(--hm-sw-viewer-panel-inner-border);
+  background: var(--hm-sw-viewer-panel-background);
+}
+
+/* Panel content */
+.hm-sw-viewer-section { display: flex; flex-direction: column; gap: 12px; }
+.hm-sw-viewer-section[data-surface="card"] {
+  padding: var(--hm-sw-viewer-panel-spacing);
+  border: 1px solid var(--hm-sw-viewer-panel-inner-border);
+  border-radius: var(--hm-sw-viewer-radius);
+  background: var(--hm-sw-viewer-panel-field-background);
+  box-shadow: inset 0 1px 0 #fff;
+}
+.hm-sw-viewer-section__title { margin: 0; color: var(--hm-sw-viewer-panel-heading); font-size: 12px; font-weight: 700; line-height: 16px; letter-spacing: 0.025em; text-transform: uppercase; }
+.hm-sw-viewer-hint { margin: 0; color: var(--hm-sw-viewer-panel-heading); font-size: 12px; line-height: 16px; }
+.hm-sw-viewer-field { display: flex; flex-direction: column; gap: 6px; }
+.hm-sw-viewer-field[data-disabled] { opacity: 0.5; pointer-events: none; }
+.hm-sw-viewer-field__row { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 20px; }
+.hm-sw-viewer-field__label { min-width: 0; color: var(--hm-sw-viewer-panel-label); font-size: 14px; font-weight: 500; line-height: 20px; }
+.hm-sw-viewer-field__control { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
+.hm-sw-viewer-field__unit { color: var(--hm-sw-viewer-panel-label); font-size: 12px; }
+
+.hm-sw-theme .hm-sw-viewer-input {
+  box-sizing: border-box;
+  width: 80px;
+  height: 28px;
+  padding: 0 10px;
+  border: 1px solid var(--hm-sw-viewer-panel-inner-border);
+  border-radius: var(--hm-sw-viewer-radius);
+  background: var(--hm-sw-viewer-panel-field-background);
+  color: var(--hm-sw-viewer-panel-text);
+  font: inherit;
+  font-size: 12px;
+  line-height: 18px;
+}
+.hm-sw-theme .hm-sw-viewer-input:focus-visible { outline: 2px solid var(--hm-sw-viewer-panel-switch-on); outline-offset: -1px; }
+.hm-sw-theme .hm-sw-viewer-input:disabled { opacity: 0.5; }
+
+.hm-sw-theme .hm-sw-viewer-slider {
+  --hm-sw-viewer-slider-percent: 0%;
+  width: 100%;
+  height: 18px;
+  margin: 0;
+  background: transparent;
+  appearance: none;
+  cursor: pointer;
+}
+.hm-sw-viewer-slider::-webkit-slider-runnable-track { height: 6px; border-radius: 9999px; background: linear-gradient(90deg, var(--hm-sw-viewer-panel-switch-on) var(--hm-sw-viewer-slider-percent), var(--hm-sw-viewer-panel-background) var(--hm-sw-viewer-slider-percent)); }
+.hm-sw-viewer-slider::-moz-range-track { height: 6px; border-radius: 9999px; background: var(--hm-sw-viewer-panel-background); }
+.hm-sw-viewer-slider::-moz-range-progress { height: 6px; border-radius: 9999px; background: var(--hm-sw-viewer-panel-switch-on); }
+.hm-sw-viewer-slider::-webkit-slider-thumb { width: 18px; height: 18px; margin-top: -6px; border: 2px solid var(--hm-sw-viewer-panel-switch-on); border-radius: 9999px; background: #fff; appearance: none; }
+.hm-sw-viewer-slider::-moz-range-thumb { box-sizing: border-box; width: 18px; height: 18px; border: 2px solid var(--hm-sw-viewer-panel-switch-on); border-radius: 9999px; background: #fff; }
+.hm-sw-theme .hm-sw-viewer-slider:focus-visible { outline: 2px solid var(--hm-sw-viewer-panel-switch-on); outline-offset: 2px; }
+
+.hm-sw-theme .hm-sw-viewer-button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+  height: 24px;
+  padding: 0 8px;
+  border: 1px solid var(--hm-sw-viewer-panel-primary);
+  border-radius: var(--hm-sw-viewer-radius);
+  background: #fff;
+  color: var(--hm-sw-viewer-panel-primary);
+  font-size: 12px;
+  font-weight: 500;
+  line-height: 16px;
+  white-space: nowrap;
+}
+.hm-sw-theme .hm-sw-viewer-button[data-variant="outline"]:hover:not(:disabled) { background: var(--hm-sw-viewer-panel-field-background); }
+.hm-sw-theme .hm-sw-viewer-button[data-variant="primary"] { background: var(--hm-sw-viewer-panel-primary); color: #fff; }
+.hm-sw-theme .hm-sw-viewer-button[data-variant="primary"]:hover:not(:disabled) { background: var(--hm-sw-viewer-hover); border-color: var(--hm-sw-viewer-hover); }
+.hm-sw-theme .hm-sw-viewer-button:focus-visible { outline: 2px solid var(--hm-sw-viewer-panel-switch-on); outline-offset: 1px; }
+.hm-sw-theme .hm-sw-viewer-button:disabled { opacity: 0.5; cursor: not-allowed; }
+.hm-sw-viewer-button__icon { display: inline-flex; width: 16px; height: 16px; }
+.hm-sw-viewer-button__icon > svg { width: 100%; height: 100%; }
+
+.hm-sw-viewer-badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: var(--hm-sw-viewer-radius); background: var(--hm-sw-viewer-panel-badge-background); color: var(--hm-sw-viewer-panel-label); font-size: 12px; font-weight: 500; line-height: 18px; font-variant-numeric: tabular-nums; }
+
+/* Corner resize grip (replaces native resize: same corner and glyph idea, works in every browser and with
+   pointer capture; the size stays within min / 90% of the bounds / the bounds edge). */
+.hm-sw-viewer-panel__resize {
+  position: absolute;
+  right: 0;
+  bottom: 0;
+  z-index: 1;
+  width: 14px;
+  height: 14px;
+  cursor: nwse-resize;
+  touch-action: none;
+  background:
+    linear-gradient(135deg, transparent 0 55%, var(--hm-sw-viewer-panel-inner-border) 55% 62%, transparent 62% 72%, var(--hm-sw-viewer-panel-inner-border) 72% 79%, transparent 79%);
+}
diff --git a/packages/sw/tests/storybook-inventory.mjs b/packages/sw/tests/storybook-inventory.mjs
index a5b65ba..990cbb3 100644
--- a/packages/sw/tests/storybook-inventory.mjs
+++ b/packages/sw/tests/storybook-inventory.mjs
@@ -14,6 +14,9 @@ export const inventorySignature = entries => entries.map(entry => [entry.id, ent
 // SW/Header next to its 10 retained Stories, the rest under SW/Tool and SW/Popup), and the only package files it changed.
 // The two Header Stories sit directly under SW/Header (no separate Options menu), in src/sw/sw-header-open.stories.tsx.
 export const integratedStoryIds = ['sw-header--document-open', 'sw-header--hidden-sub-controls', 'sw-tool--tool-buttons', 'sw-popup--custom-content', 'sw-popup--multiple-popups']
+// 2026-10-19 (viewer worktree, user request): the SW/Tool Story menu was removed; SW/Popup (the common SWPopup
+// examples) stays. SWToolButton / SWToolGroup stay public; integrated-improvement.browser.mjs opening this id is historical evidence only.
+export const retiredToolIds = ["sw-tool--tool-buttons"]
 export const integratedChangedFiles = [
   'packages/sw/README.md', 'packages/sw/package.json', 'packages/sw/build.mjs',
   'packages/sw/ai/AI_USAGE.md', 'packages/sw/ai/COMPONENT_CATALOG.md', 'packages/sw/ai/COMPOSITION_PATTERNS.md', 'packages/sw/ai/DESIGN_RULES.md',
diff --git a/packages/sw/tests/viewer-regression.browser.mjs b/packages/sw/tests/viewer-regression.browser.mjs
new file mode 100644
index 0000000..e3aca60
--- /dev/null
+++ b/packages/sw/tests/viewer-regression.browser.mjs
@@ -0,0 +1,47 @@
+// Regression for the SW viewer work (2026-10-19): the existing SW/Header Stories must render pixel-identical
+// before (base Storybook) and after (this branch) at several widths.
+// Usage: node packages/sw/tests/viewer-regression.browser.mjs <base-storybook-url> <new-storybook-url> <out-dir>
+import { createRequire } from 'node:module'
+import { mkdir, writeFile } from 'node:fs/promises'
+import path from 'node:path'
+
+const runtime = process.env.SW_RUNTIME_MODULES ?? 'C:/Users/user/.cache/codex-runtimes/codex-primary-runtime/dependencies/node/node_modules'
+const require = createRequire(path.join(runtime, 'index.js'))
+const { chromium } = require('playwright')
+const { PNG } = require('pngjs')
+const pixelmatch = require('pixelmatch').default ?? require('pixelmatch')
+const [base, next, outArg] = process.argv.slice(2)
+const out = path.resolve(outArg ?? 'docs/sw/viewer-qa/regression')
+await mkdir(out, { recursive: true })
+const ids = ['overview', 'interactive-states', 'logo-slot', 'document-dropdown', 'responsive-more', 'k-guide', 'property-panel-compare', 'composed-controls', 'document-open', 'hidden-sub-controls', 'detail-buttons']
+const widths = [1920, 1180, 768]
+const browser = await chromium.launch({ headless: true, executablePath: process.env.SW_CHROME_PATH ?? 'C:/Program Files/Google/Chrome/Application/chrome.exe' })
+const shot = async (url, width) => {
+  const page = await browser.newPage({ viewport: { width, height: 1000 }, reducedMotion: 'reduce' })
+  await page.goto(url)
+  await page.waitForSelector('#storybook-root > *')
+  await page.evaluate(() => document.fonts.ready)
+  await page.waitForTimeout(400)
+  const buffer = await page.screenshot({ fullPage: true, animations: 'disabled' })
+  await page.close()
+  return PNG.sync.read(buffer)
+}
+const results = []
+for (const id of ids) for (const width of widths) {
+  const url = root => `${root}/iframe.html?id=sw-header--${id}&viewMode=story`
+  const [a, b] = [await shot(url(base), width), await shot(url(next), width)]
+  const same = a.width === b.width && a.height === b.height
+  let diff = same ? 0 : -1
+  if (same) {
+    const image = new PNG({ width: a.width, height: a.height })
+    diff = pixelmatch(a.data, b.data, image.data, a.width, a.height, { threshold: 0 })
+    if (diff) await writeFile(path.join(out, `${id}-${width}-diff.png`), PNG.sync.write(image))
+  }
+  results.push({ id, width, size: `${a.width}x${a.height} / ${b.width}x${b.height}`, diffPixels: diff, result: diff === 0 ? 'PASS' : 'FAIL' })
+  console.log(`${diff === 0 ? 'PASS' : 'FAIL'}  sw-header--${id} @${width}  diff ${diff}`)
+}
+await browser.close()
+await writeFile(path.join(out, 'regression.json'), JSON.stringify({ base, next, results }, null, 2) + '\n')
+const failed = results.filter(item => item.result !== 'PASS').length
+console.log(`${results.length - failed}/${results.length} PASS`)
+process.exit(failed ? 1 : 0)
diff --git a/packages/sw/tests/viewer.browser.mjs b/packages/sw/tests/viewer.browser.mjs
new file mode 100644
index 0000000..5f7b689
--- /dev/null
+++ b/packages/sw/tests/viewer.browser.mjs
@@ -0,0 +1,391 @@
+// SW viewer mode verification (2026-10-19).
+// 1) Captures the reference DWG/DXF viewer and the SW/Viewer Stories at the same resolution (1440 x 900).
+// 2) Runs interaction checks on the Stories (menus, keyboard, Escape, outside click, panels, More, modal).
+// Usage: node packages/sw/tests/viewer.browser.mjs <storybook-url> <reference-url|-> <out-dir>
+//   e.g. node packages/sw/tests/viewer.browser.mjs http://127.0.0.1:6034 http://127.0.0.1:5182 docs/sw/viewer-qa
+import { createRequire } from 'node:module'
+import { mkdir, writeFile } from 'node:fs/promises'
+import path from 'node:path'
+
+const runtime = process.env.SW_RUNTIME_MODULES ?? 'C:/Users/user/.cache/codex-runtimes/codex-primary-runtime/dependencies/node/node_modules'
+const require = createRequire(path.join(runtime, 'index.js'))
+const { chromium } = require('playwright')
+const [storybook, reference, outArg] = process.argv.slice(2)
+const out = path.resolve(outArg ?? 'docs/sw/viewer-qa')
+await mkdir(out, { recursive: true })
+
+const browser = await chromium.launch({ headless: true, executablePath: process.env.SW_CHROME_PATH ?? 'C:/Program Files/Google/Chrome/Application/chrome.exe' })
+const results = []
+const check = (name, pass, detail = '') => { results.push({ name, result: pass ? 'PASS' : 'FAIL', detail }); console.log(`${pass ? 'PASS' : 'FAIL'}  ${name}${detail ? `  — ${detail}` : ''}`) }
+const errors = []
+const story = id => `${storybook}/iframe.html?id=sw-viewer--${id}&viewMode=story`
+const newPage = async (width = 1440, height = 900) => {
+  const page = await browser.newPage({ viewport: { width, height }, reducedMotion: 'reduce' })
+  page.on('pageerror', error => errors.push(`${page.url()}: ${error.message}`))
+  page.on('console', message => { if (message.type() === 'error' && !/favicon|404/.test(message.text())) errors.push(`${page.url()}: ${message.text()}`) })
+  return page
+}
+// Test-only: lift the 1280px Story page envelope so the 1440px frames are measured at full width.
+const open = async (page, id) => { await page.goto(story(id)); await page.waitForSelector('.hm-sw-viewer-header'); await page.addStyleTag({ content: '.sb-page { --sb-page-max-width: 100vw; }' }); await page.evaluate(() => document.fonts.ready); await page.waitForTimeout(200) }
+const log = page => page.locator('[data-callback-log]').first().innerText()
+const box = locator => locator.boundingBox()
+
+// ---------- 1. Same-resolution captures ----------
+const geometry = async (page, selectors) => page.evaluate(selectors => {
+  const header = document.querySelector(selectors.header)
+  const base = header.getBoundingClientRect()
+  return Object.fromEntries(Object.entries(selectors.parts).map(([name, selector]) => [name, [...document.querySelectorAll(selector)].map(element => {
+    const rect = element.getBoundingClientRect()
+    return { x: Math.round(rect.x - base.x), y: Math.round(rect.y - base.y), w: Math.round(rect.width), h: Math.round(rect.height), text: element.textContent.trim().slice(0, 12) }
+  })]))
+}, selectors)
+const parts = {
+  reference: { header: 'header', parts: { document: '.cad-toolbar-document', object: '.cad-toolbar-object-area', field: '.cad-toolbar-property-field', button: '.cad-toolbar [data-slot=button]', toggle: '.cad-toolbar [data-slot=toggle]', tab: '.cad-toolbar [data-slot=tabs-trigger]', switchField: '.cad-toolbar-switch-field' } },
+  package: { header: '.hm-sw-viewer-header', parts: { document: '.hm-sw-viewer-header__document', object: '.hm-sw-viewer-header__object', field: '.hm-sw-viewer-header__group[data-surface=field]', button: '.hm-sw-viewer-header__button:not([data-kind=toggle])', toggle: '.hm-sw-viewer-header__button[data-kind=toggle]', tab: '.hm-sw-viewer-header__tab', switchField: '.hm-sw-viewer-header__switch-field' } },
+}
+const comparison = {}
+if (reference && reference !== '-') {
+  const page = await newPage()
+  await page.goto(reference)
+  await page.waitForSelector('header')
+  await page.evaluate(() => document.fonts.ready)
+  await page.screenshot({ path: path.join(out, 'reference-1440-idle.png'), clip: { x: 0, y: 0, width: 1440, height: 56 } })
+  await page.getByRole('button', { name: '샘플' }).click()
+  await page.screenshot({ path: path.join(out, 'reference-1440-sample-menu.png'), clip: { x: 0, y: 0, width: 1440, height: 200 } })
+  await page.getByRole('menuitem', { name: /평면 및 종단면도/ }).click()
+  await page.waitForFunction(() => document.querySelector('.cad-toolbar-filename')?.textContent?.includes('C0060202'), null, { timeout: 30000 })
+  await page.waitForTimeout(1500)
+  comparison.reference = await geometry(page, parts.reference)
+  await page.screenshot({ path: path.join(out, 'reference-1440-loaded.png'), clip: { x: 0, y: 0, width: 1440, height: 56 } })
+  await page.getByRole('button', { name: '레이어 패널' }).click()
+  await page.getByRole('button', { name: '옵션 패널' }).click()
+  await page.waitForTimeout(300)
+  await page.screenshot({ path: path.join(out, 'reference-1440-panels.png') })
+  await page.close()
+}
+{
+  const page = await newPage(1920, 1000)
+  await open(page, 'viewer-header')
+  const frame = page.locator('[data-viewer-frame]')
+  const origin = await box(frame)
+  comparison.package = await geometry(page, parts.package)
+  await page.screenshot({ path: path.join(out, 'package-1440-loaded.png'), clip: { x: origin.x, y: origin.y, width: 1440, height: 56 } })
+  await page.getByRole('button', { name: '샘플' }).click()
+  await page.screenshot({ path: path.join(out, 'package-1440-sample-menu.png'), clip: { x: origin.x, y: origin.y, width: 1440, height: 200 } })
+  await page.keyboard.press('Escape')
+  await page.getByRole('button', { name: '레이어' }).click()
+  await page.getByRole('button', { name: '설정' }).click()
+  await page.waitForTimeout(200)
+  await page.screenshot({ path: path.join(out, 'package-1440-panels.png'), clip: { x: origin.x, y: origin.y, width: 1440, height: 620 } })
+  await page.close()
+}
+if (comparison.reference) {
+  // Same item = same size (positions shift with the file-name text width, which differs by sample data).
+  for (const key of ['button', 'toggle', 'tab', 'switchField', 'field']) {
+    const a = comparison.reference[key].map(item => `${item.w}x${item.h}`), b = comparison.package[key].map(item => `${item.w}x${item.h}`)
+    // field: the reference Tabs root is 39px inside its 40px frame, so its tab field is 41px; the package keeps both fields 42px (documented 1px difference).
+    const within = key === 'field' ? comparison.reference[key].every((item, index) => comparison.package[key][index] && item.w === comparison.package[key][index].w && Math.abs(item.h - comparison.package[key][index].h) <= 1) : JSON.stringify(a) === JSON.stringify(b)
+    check(`geometry ${key} sizes equal to reference${key === 'field' ? ' (±1px height, known)' : ''}`, within, `reference ${a.join(' ')} / package ${b.join(' ')}`)
+  }
+  const [r, p] = [comparison.reference.document[0], comparison.package.document[0]]
+  // x differs by design: the reference always draws "HM" (72px cap); the package draws no logo unless given (24px cap).
+  check('geometry document well height / top (x: logo rule)', r.h === p.h && r.y === p.y && p.x === r.x - 48, `reference x${r.x} y${r.y} h${r.h} / package x${p.x} y${p.y} h${p.h}`)
+}
+
+// ---------- 2. Interactions ----------
+{
+  // Wide enough for the 1440px story frame plus the story page padding (panels at the frame right edge stay on screen).
+  const page = await newPage(1920, 1000)
+  await open(page, 'viewer-header')
+  // Dropdown: click opens, entries listed, Escape closes and returns focus.
+  const samples = page.getByRole('button', { name: '샘플' })
+  await samples.click()
+  const menu = page.getByRole('menu', { name: '샘플' })
+  check('menu opens on click', await menu.isVisible())
+  check('menu has 3 entries', (await menu.getByRole('menuitem').count()) === 3)
+  const menuBox = await box(menu), triggerBox = await box(samples)
+  check('menu placed under its button', Math.abs(menuBox.x - triggerBox.x) <= 1 && menuBox.y >= triggerBox.y + triggerBox.height, `menu ${Math.round(menuBox.x)},${Math.round(menuBox.y)} button ${Math.round(triggerBox.x)},${Math.round(triggerBox.y + triggerBox.height)}`)
+  check('trigger shows open state', (await samples.getAttribute('aria-expanded')) === 'true' && (await samples.getAttribute('data-state')) === 'open')
+  await page.keyboard.press('ArrowDown')
+  await page.keyboard.press('ArrowDown')
+  check('ArrowDown moves focus in menu', (await page.evaluate(() => document.activeElement?.textContent)).includes('평면'))
+  await page.keyboard.press('Escape')
+  check('Escape closes menu', !(await menu.isVisible().catch(() => false)))
+  check('Escape returns focus to trigger', await samples.evaluate(element => element === document.activeElement))
+  // Keyboard open + Enter select → file name changes, command logged.
+  await samples.press('Enter')
+  check('Enter opens with first entry focused', (await page.evaluate(() => document.activeElement?.getAttribute('role'))) === 'menuitem')
+  await page.keyboard.press('End')
+  await page.keyboard.press('Enter')
+  check('Enter selects entry (document changes)', (await page.locator('.hm-sw-viewer-header__document-name').innerText()) === 'simple.dxf')
+  check('onCommand reports menu entry', (await log(page)).includes('samples/sample-dxf'), await log(page))
+  // Outside click closes.
+  await samples.click()
+  await page.mouse.click(700, 600)
+  check('outside click closes menu', (await page.getByRole('menu').count()) === 0)
+  // Tabs: arrow keys select.
+  const model = page.getByRole('radio', { name: /Model/ })
+  await model.focus()
+  await page.keyboard.press('ArrowRight')
+  check('tabs ArrowRight selects Layout', (await page.getByRole('radio', { name: /Layout/ }).getAttribute('aria-checked')) === 'true')
+  // Switch
+  const depth = page.getByRole('switch', { name: '2.5D' })
+  await depth.click()
+  check('header switch toggles', (await depth.getAttribute('aria-checked')) === 'true' && (await log(page)).includes('2.5d=true'))
+  // Disabled fit button is enabled once a document is open; hover face.
+  const fit = page.getByRole('button', { name: '전체 보기' })
+  await fit.hover()
+  check('hover face #266651', (await fit.evaluate(element => getComputedStyle(element).backgroundColor)) === 'rgb(38, 102, 81)')
+  // Toggle opens the panel; Escape inside closes it and focus goes back.
+  const layers = page.getByRole('button', { name: '레이어', exact: true })
+  await layers.click()
+  const layerPanel = page.getByRole('dialog', { name: /레이어 \(/ })
+  check('toggle opens panel', await layerPanel.isVisible())
+  check('toggle pressed state + #FFC600', (await layers.getAttribute('aria-pressed')) === 'true' && (await layers.evaluate(element => getComputedStyle(element).color)) === 'rgb(255, 198, 0)')
+  check('panel focused on open', await layerPanel.evaluate(element => element.contains(document.activeElement)))
+  await page.keyboard.press('Escape')
+  check('Escape closes panel', (await page.getByRole('dialog', { name: /레이어 \(/ }).count()) === 0)
+  check('focus returns to toggle', await layers.evaluate(element => element === document.activeElement))
+  // Resize by the native corner (right after opening, top-end placement).
+  await layers.click()
+  const sized = await box(layerPanel)
+  await page.mouse.move(sized.x + sized.width - 6, sized.y + sized.height - 6)
+  await page.mouse.down()
+  await page.mouse.move(sized.x + sized.width - 63, sized.y + sized.height - 103, { steps: 6 })
+  await page.mouse.up()
+  const resized = await box(layerPanel)
+  check("corner resize changes size", resized.width < sized.width - 40 && resized.height < sized.height - 80, `${Math.round(sized.width)}x${Math.round(sized.height)} → ${Math.round(resized.width)}x${Math.round(resized.height)}`)
+  // Drag: title bar moves the panel and it stays inside the frame.
+  const before = await box(layerPanel)
+  const title = layerPanel.locator('.hm-sw-viewer-panel__titlebar')
+  const titleBox = await box(title)
+  await page.mouse.move(titleBox.x + 40, titleBox.y + 15)
+  await page.mouse.down()
+  await page.mouse.move(titleBox.x - 260, titleBox.y + 45, { steps: 8 })
+  await page.mouse.up()
+  const after = await box(layerPanel)
+  check('drag moves panel', Math.round(before.x - after.x) === 300 && Math.round(after.y - before.y) === 30, `dx ${Math.round(after.x - before.x)} dy ${Math.round(after.y - before.y)}`)
+  await page.mouse.move(after.x + 40, after.y + 15)
+  await page.mouse.down()
+  await page.mouse.move(after.x + 3000, after.y + 3000, { steps: 6 })
+  await page.mouse.up()
+  const frame = await box(page.locator('.sw-viewer-story-canvas'))
+  const clamped = await box(layerPanel)
+  check('drag stays inside bounds (10px edge)', Math.round(frame.x + frame.width - (clamped.x + clamped.width)) === 10 && Math.round(frame.y + frame.height - (clamped.y + clamped.height)) === 10,
+    `right gap ${Math.round(frame.x + frame.width - (clamped.x + clamped.width))}, bottom gap ${Math.round(frame.y + frame.height - (clamped.y + clamped.height))}`)
+  // Collapse by button and double click.
+  await layerPanel.getByRole('button', { name: '접기' }).click()
+  check('collapse hides body', (await layerPanel.locator('.hm-sw-viewer-panel__body').count()) === 0)
+  await title.dblclick({ position: { x: 30, y: 15 } })
+  check('title double click expands', (await layerPanel.locator('.hm-sw-viewer-panel__body').count()) === 1)
+  // Panel content works (layer eye).
+  await layerPanel.getByRole('button', { name: 'CR-TEXT 숨기기' }).click()
+  check('panel content callback', (await log(page)).includes('layer:CR-TEXT=false'))
+  // Close button hover face.
+  const close = layerPanel.getByRole('button', { name: '닫기' })
+  await close.hover()
+  check('close hover #E40000 / white X', (await close.evaluate(element => [getComputedStyle(element).getPropertyValue('--hm-sw-viewer-close-glow').trim(), getComputedStyle(element).color].join(' '))) === '#e40000 rgb(255, 255, 255)')
+  await close.click()
+  check('close button closes', (await page.getByRole('dialog', { name: /레이어 \(/ }).count()) === 0)
+  // Two panels: the last touched comes to the front.
+  await layers.click()
+  await page.getByRole('button', { name: '설정', exact: true }).click()
+  const options = page.getByRole('dialog', { name: '옵션' })
+  const z = async () => Promise.all([layerPanel, options].map(item => item.evaluate(element => Number(getComputedStyle(element).zIndex))))
+  await layerPanel.locator('.hm-sw-viewer-panel__titlebar').click({ position: { x: 30, y: 15 } })
+  const [zl, zo] = await z()
+  check('last touched panel on top', zl > zo, `layer z ${zl}, options z ${zo}`)
+  // Modal popup: backdrop, focus trap, Escape.
+  await page.getByRole('button', { name: '정보 및 라이선스' }).click()
+  const about = page.getByRole('dialog', { name: /라이선스/ })
+  check('modal popup opens with backdrop', (await about.getAttribute('aria-modal')) === 'true' && (await page.locator('.hm-sw-viewer-panel-backdrop').count()) === 1)
+  for (let index = 0; index < 4; index++) await page.keyboard.press('Tab')
+  check('modal focus stays inside', await about.evaluate(element => element.contains(document.activeElement)))
+  await page.keyboard.press('Escape')
+  check('modal Escape closes', (await page.getByRole('dialog', { name: /라이선스/ }).count()) === 0)
+  await page.close()
+}
+{
+  // Submenus and the context menu.
+  const page = await newPage(1920, 1100)
+  await open(page, 'dropdowns')
+  await page.getByRole('button', { name: '도면' }).press('Enter')
+  const recent = page.getByRole('menuitem', { name: '최근 도면' })
+  await recent.focus()
+  await page.keyboard.press('ArrowRight')
+  const sub = page.getByRole('menu', { name: '최근 도면' })
+  check('ArrowRight opens submenu with focus', (await sub.isVisible()) && await sub.evaluate(element => element.contains(document.activeElement)))
+  const parentBox = await box(page.getByRole('menu', { name: '도면', exact: true })), subBox = await box(sub)
+  check('submenu opens to the side', subBox.x >= parentBox.x + parentBox.width, `parent right ${Math.round(parentBox.x + parentBox.width)}, sub left ${Math.round(subBox.x)}`)
+  await page.getByRole('menuitem', { name: '보관 도면' }).hover()
+  check('third level opens on hover', await page.getByRole('menu', { name: '보관 도면' }).isVisible())
+  await page.getByRole('menuitem', { name: '보관 도면' }).focus()
+  await page.keyboard.press('ArrowLeft')
+  check('ArrowLeft closes one level', (await page.getByRole('menu', { name: '최근 도면' }).count()) === 0 && (await page.getByRole('menu', { name: '도면', exact: true }).count()) === 1)
+  await page.getByRole('menuitemcheckbox', { name: '선가중치 표시' }).click()
+  check('checkbox entry toggles via onCommand', (await log(page)).includes('file/lineweight=true'), await log(page))
+  await page.getByRole('button', { name: '도면' }).click()
+  check('checkbox state reflected', (await page.getByRole('menuitemcheckbox', { name: '선가중치 표시' }).getAttribute('aria-checked')) === 'true')
+  await page.getByRole('menuitem', { name: '인쇄 (미연결)' }).click({ force: true })
+  check('disabled entry does nothing', (await page.getByRole('menu', { name: '도면', exact: true }).count()) === 1)
+  await page.keyboard.press('Escape')
+  const right = page.getByRole('button', { name: '오른쪽 정렬 메뉴' })
+  await right.click()
+  const rightMenu = page.getByRole('menu', { name: '오른쪽 정렬 메뉴' })
+  const [rb, rm] = [await box(right), await box(rightMenu)]
+  check('menuAlign end + menuWidth', Math.abs(rb.x + rb.width - (rm.x + rm.width)) <= 1 && Math.round(rm.width) === 220, `width ${Math.round(rm.width)}`)
+  await page.keyboard.press('Escape')
+  const area = page.locator('[data-context-area]')
+  const areaBox = await box(area)
+  await page.mouse.click(areaBox.x + 50, areaBox.y + 40, { button: 'right' })
+  const context = page.getByRole('menu', { name: '도면 메뉴' })
+  const contextBox = await box(context)
+  check('context menu opens at pointer', Math.abs(contextBox.x - (areaBox.x + 50)) <= 1 && Math.abs(contextBox.y - (areaBox.y + 40)) <= 1, `${Math.round(contextBox.x)},${Math.round(contextBox.y)}`)
+  await page.getByRole('menuitem', { name: '선택 확대' }).click()
+  check('context entry reported', (await log(page)).includes('context/zoom-selection'))
+  // Menu kept inside the viewport near the right edge.
+  await page.setViewportSize({ width: 900, height: 700 })
+  await page.mouse.click(0, 0)
+  await page.evaluate(() => window.scrollTo(0, 0))
+  await page.waitForTimeout(100)
+  await page.locator('.sw-story-scroller').first().evaluate(element => { element.scrollLeft = element.scrollWidth })
+  await right.click()
+  const edge = await box(page.getByRole('menu', { name: '오른쪽 정렬 메뉴' }))
+  check('menu stays inside the viewport', edge.x >= 4 && edge.x + edge.width <= 900 - 4, `left ${Math.round(edge.x)}, right ${Math.round(edge.x + edge.width)}`)
+  await page.close()
+}
+{
+  // Responsive: More collects the collapsed items, no horizontal overflow, icon-only below 560.
+  const page = await newPage(1920, 1200)
+  await open(page, 'responsive')
+  const headers = page.locator('[data-width] .hm-sw-viewer-header')
+  const report = []
+  for (const [index, width] of [1440, 1100, 860, 520].entries()) {
+    const header = headers.nth(index)
+    const info = await header.evaluate(element => ({
+      overflow: element.scrollWidth - element.clientWidth,
+      objectOverflow: (() => { const object = element.querySelector('.hm-sw-viewer-header__object'); return object.scrollWidth - object.clientWidth })(),
+      more: !!element.querySelector('.hm-sw-viewer-header__more'),
+      labels: [...element.querySelectorAll('.hm-sw-viewer-header__button, .hm-sw-viewer-header__tab, .hm-sw-viewer-header__switch-label')].map(item => item.textContent.trim() || item.getAttribute('aria-label')),
+    }))
+    report.push({ width, ...info })
+    const box2 = await box(header)
+    await page.screenshot({ path: path.join(out, `package-responsive-${width}.png`), clip: { x: box2.x, y: box2.y, width: box2.width, height: box2.height } })
+  }
+  check('no horizontal overflow at 1440 / 1100 / 860 / 520', report.every(item => item.overflow <= 0 && item.objectOverflow <= 1), JSON.stringify(report.map(item => [item.width, item.overflow, item.objectOverflow])))
+  check('1440: no More', !report[0].more)
+  check('1100: More, samples/tabs/switches moved', report[1].more && !report[1].labels.includes('샘플') && !report[1].labels.includes('2.5D') && report[1].labels.includes('레이어'))
+  check('860: panel toggles moved too', report[2].more && !report[2].labels.includes('레이어'))
+  check('520: 파일 열기 / 전체 보기 icon only', report[3].labels.includes('파일 열기') && !(await headers.nth(3).locator('.hm-sw-viewer-header__label', { hasText: '파일 열기' }).count()))
+  const more = headers.nth(2).getByRole('button', { name: '추가 도구' })
+  await more.click()
+  const moreMenu = page.getByRole('menu', { name: '추가 도구' })
+  const items = await moreMenu.locator('.hm-sw-viewer-menu__label, [role^=menuitem]').allInnerTexts()
+  check('More sections like the reference', ['샘플 도면', '도면 공간', '화면 보기', '패널'].every(label => items.includes(label)), items.join(' | '))
+  check('More face beige 260px', (await moreMenu.evaluate(element => `${getComputedStyle(element).backgroundColor} ${element.offsetWidth}`)) === 'rgb(245, 240, 229) 260')
+  await moreMenu.getByRole('menuitemcheckbox', { name: '레이어' }).click()
+  check('More checkbox reports command', (await log(page)).includes('layers=true'), await log(page))
+  await more.click()
+  await page.getByRole('menuitemradio', { name: /Layout/ }).click()
+  check('More radio selects tab value', (await log(page)).includes('space=layout1'))
+  await page.screenshot({ path: path.join(out, 'package-responsive-more-open.png') })
+  await page.close()
+}
+{
+  // Story captures (full page) for the report.
+  const page = await newPage(1920, 1000)
+  for (const id of ['viewer-header', 'menu-groups', 'states', 'dropdowns', 'settings-panel', 'content-variants', 'variable-size', 'responsive', 'logo', 'compare-with-sw-header']) {
+    await open(page, id)
+    await page.screenshot({ path: path.join(out, `story-${id}.png`), fullPage: true })
+  }
+  // Mode switch keeps state.
+  await open(page, 'compare-with-sw-header')
+  await page.getByLabel('뷰어 모드 (SWViewerHeader)').check()
+  const frame = page.locator('[data-viewer-frame]').last()
+  check('mode switch shows viewer header', (await frame.locator('.hm-sw-viewer-header').count()) === 1 && (await frame.locator('.hm-sw-header').count()) === 0)
+  await frame.getByRole('button', { name: '레이어', exact: true }).click()
+  await frame.getByRole('button', { name: '임시 로고 (일반 모드로) 홈' }).click()
+  check('brand click returns to normal SWHeader', (await frame.locator('.hm-sw-header').count()) === 1 && (await frame.locator('.hm-sw-viewer-header').count()) === 0)
+  await page.getByLabel('뷰어 모드 (SWViewerHeader)').check()
+  check('state kept across mode switch (layer panel still open)', (await frame.getByRole('dialog', { name: /레이어 \(/ }).count()) === 1)
+  await page.close()
+}
+{
+  // Logo: nothing drawn without one, image / element when given; layout unchanged.
+  const page = await newPage(1920, 1000)
+  await open(page, 'logo')
+  const cases = page.locator('[data-logo-case]')
+  const read = index => cases.nth(index).evaluate(element => {
+    const brand = element.querySelector('.hm-sw-viewer-header__brand'), doc = element.querySelector('.hm-sw-viewer-header__document')
+    const base = element.getBoundingClientRect()
+    return {
+      text: brand.textContent.trim(), img: !!brand.querySelector('img, .hm-sw-viewer-header__brand-mark svg'),
+      width: Math.round(brand.getBoundingClientRect().width), docX: Math.round(doc.getBoundingClientRect().x - base.x),
+      height: Math.round(element.querySelector('.hm-sw-viewer-header').getBoundingClientRect().height),
+      fileOpenY: Math.round(element.querySelector('.hm-sw-viewer-header__button').getBoundingClientRect().y - base.y),
+    }
+  })
+  const [none, src, node] = [await read(0), await read(1), await read(2)]
+  check('logo none: no HM / text / icon', none.text === '' && !none.img, JSON.stringify(none))
+  check('logo none: cap shrinks to its edge (no wide gap)', none.width === 24, JSON.stringify(none))
+  const logoWidth = await cases.nth(1).locator('.hm-sw-viewer-header__brand-mark').evaluate(element => Math.round(element.getBoundingClientRect().width))
+  check('logoSrc shows the image (cap = 24 + logo + 25, min 72)', src.img && src.width === Math.max(72, 24 + logoWidth + 25), JSON.stringify({ ...src, logoWidth }))
+  check('logo element shown', node.img && node.width >= 72, JSON.stringify(node))
+  check('header height and menu row unchanged with / without logo', [none, src, node].every(item => item.height === 52 && item.fileOpenY === none.fileOpenY), [none, src, node].map(item => item.height + '/' + item.fileOpenY).join(' '))
+  for (const [index, name] of [[0, 'none'], [1, 'src'], [2, 'element']]) {
+    const b = await box(cases.nth(index))
+    await page.screenshot({ path: path.join(out, 'package-logo-' + name + '.png'), clip: { x: b.x, y: b.y, width: 520, height: 52 } })
+  }
+  // Text / icon outline: same tokens as SWHeader, fill unchanged.
+  const outline = await page.evaluate(() => {
+    const header = document.querySelector('[data-logo-case] .hm-sw-viewer-header')
+    const style = selector => getComputedStyle(header.querySelector(selector))
+    return {
+      label: style('.hm-sw-viewer-header__label').textShadow, document: style('.hm-sw-viewer-header__document-name').textShadow,
+      tab: style('.hm-sw-viewer-header__tab').textShadow, caption: style('.hm-sw-viewer-header__switch-label').textShadow,
+      count: style('.hm-sw-viewer-header__count').textShadow, icon: style('.hm-sw-viewer-header__icon').filter, chevron: style('.hm-sw-viewer-header__chevron').filter,
+      labelColor: style('.hm-sw-viewer-header__label').color,
+      labelFont: [style('.hm-sw-viewer-header__label').fontSize, style('.hm-sw-viewer-header__label').fontWeight, style('.hm-sw-viewer-header__label').letterSpacing].join(' '),
+    }
+  })
+  const blacks = value => value.split('rgb(0, 0, 0)').length - 1
+  check('text outline 1.3px black on 14px text (label / file name / tab)', [outline.label, outline.document, outline.tab].every(value => value.includes('rgb(0, 0, 0) 1.3px 0px 0px') && blacks(value) === 16), outline.label.slice(0, 60))
+  check('label outline 1px black on 11px captions / counts', [outline.caption, outline.count].every(value => value.includes('rgb(0, 0, 0) 1px 0px 0px') && blacks(value) === 16), outline.caption.slice(0, 60))
+  check('icon outline: 4 x 1px black drop-shadows + #061A14 glow', [outline.icon, outline.chevron].every(value => (value.match(/drop-shadow/g) ?? []).length === 5 && value.includes('rgb(0, 0, 0) 1px 0px 0px') && value.includes('rgb(6, 26, 20)')), outline.icon.slice(0, 90))
+  check('fill / size / weight / spacing kept', outline.labelColor === 'rgb(255, 255, 255)' && outline.labelFont === '14px 500 normal', outline.labelColor + ' ' + outline.labelFont)
+  await page.close()
+}
+{
+  // SWHeader vs SWViewerHeader text / icon outline at 3x for the report.
+  const page = await browser.newPage({ viewport: { width: 1920, height: 1000 }, deviceScaleFactor: 3 })
+  await open(page, 'compare-with-sw-header')
+  const sw = await box(page.locator('.hm-sw-header').first()), vw = await box(page.locator('.hm-sw-viewer-header').first())
+  await page.screenshot({ path: path.join(out, 'outline-swheader-3x.png'), clip: { x: sw.x, y: sw.y, width: 760, height: sw.height } })
+  await page.screenshot({ path: path.join(out, 'outline-viewer-3x.png'), clip: { x: vw.x, y: vw.y, width: 760, height: vw.height } })
+  await page.screenshot({ path: path.join(out, 'outline-viewer-right-3x.png'), clip: { x: vw.x + 1000, y: vw.y, width: 440, height: vw.height } })
+  const hovered = page.locator('.hm-sw-viewer-header').first().getByRole('button', { name: '레이어', exact: true })
+  await hovered.hover()
+  check('hover changes fill only (outline kept)', (await hovered.locator('.hm-sw-viewer-header__label').evaluate(element => getComputedStyle(element).textShadow)).includes('1.3px'))
+  await page.close()
+  const states = await browser.newPage({ viewport: { width: 1920, height: 900 }, deviceScaleFactor: 2 })
+  await open(states, 'states')
+  const header = await box(states.locator('.hm-sw-viewer-header'))
+  await states.getByRole('button', { name: '기본' }).hover()
+  await states.screenshot({ path: path.join(out, 'outline-states-2x.png'), clip: { x: header.x, y: header.y, width: 1440, height: header.height } })
+  const disabled = await states.getByRole('button', { name: 'Disabled', exact: true }).evaluate(element => [getComputedStyle(element).opacity, getComputedStyle(element.querySelector('.hm-sw-viewer-header__label')).textShadow.includes('1.3px')])
+  check('disabled fades text + outline together', disabled[0] === '0.6' && disabled[1] === true, JSON.stringify(disabled))
+  await states.close()
+}
+{
+  // Storybook sidebar: SW/Tool removed; SW/Popup (common SWPopup examples), SW/Header and SW/Viewer remain.
+  const index = await (await fetch(storybook + '/index.json')).json()
+  const titles = [...new Set(Object.values(index.entries).map(entry => entry.title).filter(title => title.startsWith('SW')))]
+  check('SW/Tool removed from the sidebar', !titles.includes('SW/Tool'), titles.join(', '))
+  check('SW/Popup, SW/Header and SW/Viewer remain', ['SW/Popup', 'SW/Header', 'SW/Viewer'].every(title => titles.includes(title)))
+}
+check('no page errors', errors.length === 0, errors.join(' | '))
+await browser.close()
+await writeFile(path.join(out, 'report.json'), JSON.stringify({ storybook, reference, comparison, results, errors }, null, 2) + '\n')
+const failed = results.filter(item => item.result === 'FAIL').length
+console.log(`\n${results.length - failed}/${results.length} PASS`)
+process.exit(failed ? 1 : 0)
diff --git a/src/sw/sw-tool.stories.tsx b/src/sw/sw-tool.stories.tsx
deleted file mode 100644
index 5e5e91a..0000000
--- a/src/sw/sw-tool.stories.tsx
+++ /dev/null
@@ -1,91 +0,0 @@
-import { useState, type ReactNode } from "react"
-import type { Meta, StoryObj } from "@storybook/react-vite"
-import { SWHeader, SWHeaderHome, SWTheme, SWToolButton, SWToolGroup } from "@hm-design/sw"
-import "@hm-design/sw/styles.css"
-import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
-import "./sw-stories.css"
-import "./sw-integrated-stories.css"
-import placeholderLogo from "./assets/sw-header-logo-placeholder.svg"
-
-// SWToolButton / SWToolGroup (2026-10-19): the existing SW toggle, pill and file-name looks as public buttons
-// for viewer tool bars (Model / Layout, Fit, 2.5D, ...). Public API only, like a consuming project.
-const KICKER = "HM DESIGN SYSTEM / SW"
-
-// Sample host icon (the program supplies its own): 24 x 23 box like the print icon, default #B6D0C9 / hover #FFC600.
-const FitIcon = ({ color }: { color: string }) => (
-  <svg viewBox="0 0 24 23" width="24" height="23" aria-hidden="true">
-    <path d="M2 8V2h6M16 2h6v6M22 15v6h-6M8 21H2v-6" fill="none" stroke={color} strokeWidth="2" />
-  </svg>
-)
-
-const meta = {
-  title: "SW/Tool",
-  parameters: { layout: "fullscreen", controls: { disable: true } },
-} satisfies Meta
-export default meta
-type Story = StoryObj<typeof meta>
-
-function Bar({ children }: { children: ReactNode }) {
-  return <div className="sw-story-scroller"><div className="sw-story-frame" style={{ width: 1440 }}>{children}</div></div>
-}
-
-function ToolPage() {
-  const [view, setView] = useState<"model" | "layout">("model")
-  const [depth, setDepth] = useState(false)
-  const [log, setLog] = useState<string[]>([])
-  const record = (line: string) => setLog(lines => [...lines.slice(-7), line])
-  const viewGroup = (
-    <SWToolGroup label="보기" selection="single" data-view-group="">
-      <SWToolButton pressed={view === "model"} onClick={() => { setView("model"); record("view(model)") }}>Model</SWToolButton>
-      <SWToolButton pressed={view === "layout"} onClick={() => { setView("layout"); record("view(layout)") }}>Layout</SWToolButton>
-    </SWToolGroup>
-  )
-  const displayGroup = (
-    <SWToolGroup label="표시" data-display-group="">
-      <SWToolButton pressed={depth} onClick={() => { setDepth(!depth); record(`2.5D(${!depth})`) }}>2.5D</SWToolButton>
-    </SWToolGroup>
-  )
-  const fit = (
-    <SWToolGroup appearance="pill" aria-label="화면" data-fit-group="">
-      <SWToolButton appearance="pill" icon={<FitIcon color="#B6D0C9" />} hoverIcon={<FitIcon color="var(--hm-sw-header-selected-color)" />} onClick={() => record("fit")}>화면 맞춤</SWToolButton>
-    </SWToolGroup>
-  )
-  return (
-    <StoryPage>
-      <StoryPageHeader kicker={KICKER} title="SW Tool — SWToolButton / SWToolGroup"
-        description="새 디자인 값 없이 기존 SW 버튼 3종을 공개 버튼으로 씁니다. text = 속성Bar·속성창 글자 토글, pill = 인쇄·K 버튼, document = 파일명 면. SWToolGroup은 상세보기 묶음(text) 또는 인쇄·K pill(pill)이며 selection=&quot;single&quot;이면 Model / Layout 같은 단일 선택(radiogroup, 화살표 키)입니다." />
-      <p className="sw-story-log" aria-live="polite" data-callback-log="">Callback: {log.length ? log.join(" → ") : "없음"}</p>
-      <StorySection title="SWHeader tools 슬롯 안" description="객체 수정 영역의 메뉴 뒤에 도구 막대를 둡니다.">
-        <Bar><SWHeader documentTitle="C0020101-006-평면및종단면도(06)" logoSrc={placeholderLogo} logoAlt="임시 로고"
-          hiddenControls={["lineStyle", "textStyle", "dimensionStyle", "details", "propertyBar", "propertyPanel"]}
-          tools={<>{viewGroup}{displayGroup}{fit}</>} /></Bar>
-      </StorySection>
-      <StorySection title="조합형 막대 (SWTheme)" description="Header 없이 같은 부품을 SWTheme 안에 배치합니다. 배치 CSS만 소비 프로젝트 소유입니다.">
-        <Bar>
-          <SWTheme className="sw-story-composed-bar" data-tool-bar="">
-            <SWHeaderHome logoSrc={placeholderLogo} logoAlt="임시 로고" />
-            <SWToolButton appearance="document" onClick={() => record("open")}>Open</SWToolButton>
-            <div className="sw-story-composed-surface">{viewGroup}{displayGroup}{fit}</div>
-          </SWTheme>
-        </Bar>
-      </StorySection>
-      <StorySection title="상태" description="text: Hover·Selected 글자 #FFC600, Disabled 40%. pill: Hover 노란 테두리, hoverIcon 교체. document: 글자만 Hover #FFC600.">
-        <Bar>
-          <SWTheme className="sw-story-composed-bar" data-tool-states="">
-            <SWHeaderHome logoSrc={placeholderLogo} logoAlt="임시 로고" interactive={false} />
-            <SWToolButton appearance="document" disabled>Disabled</SWToolButton>
-            <div className="sw-story-composed-surface">
-              <SWToolGroup label="text"><SWToolButton>Default</SWToolButton><SWToolButton pressed>Pressed</SWToolButton><SWToolButton disabled>Disabled</SWToolButton></SWToolGroup>
-              <SWToolGroup appearance="pill" aria-label="pill">
-                <SWToolButton appearance="pill" icon={<FitIcon color="#B6D0C9" />} hoverIcon={<FitIcon color="var(--hm-sw-header-selected-color)" />}>Fit</SWToolButton>
-                <SWToolButton appearance="pill" icon={<FitIcon color="#B6D0C9" />} disabled>Fit disabled</SWToolButton>
-              </SWToolGroup>
-            </div>
-          </SWTheme>
-        </Bar>
-      </StorySection>
-    </StoryPage>
-  )
-}
-
-export const ToolButtons: Story = { name: "Tool Buttons", render: () => <ToolPage /> }
diff --git a/src/sw/sw-viewer-fixture.tsx b/src/sw/sw-viewer-fixture.tsx
new file mode 100644
index 0000000..3a87373
--- /dev/null
+++ b/src/sw/sw-viewer-fixture.tsx
@@ -0,0 +1,195 @@
+// Story fixture for SW/Viewer: the reference DWG/DXF viewer menu rebuilt from the public @hm-design/sw API only.
+// UI state lives here (like a consuming program); no DWG/DXF engine — commands are logged, not executed.
+import { useMemo, useState } from "react"
+import {
+  SWViewerBadge, SWViewerButton, SWViewerHeaderButton, SWViewerStatus, SWViewerField, SWViewerHint, SWViewerInput, SWViewerPanel, SWViewerSection, SWViewerSlider, SWViewerSwitch,
+  type SWViewerCommand, type SWViewerHeaderGroup, type SWViewerPanelProps,
+} from "@hm-design/sw"
+import { Eye, EyeOff, FolderOpen, Info, Layers, List, MousePointerClick, RotateCcw, Scan, SlidersHorizontal, ZoomIn } from "lucide-react"
+
+export const SAMPLES = [
+  { id: "sample-basic", label: "기본 도면 · DWG", name: "BasicSample.dwg" },
+  { id: "sample-civil", label: "평면 및 종단면도 · DWG", name: "C0060202-001-평면및종단면도.dwg" },
+  { id: "sample-dxf", label: "기본 도형 · DXF", name: "simple.dxf" },
+] as const
+
+export const SPACES = [
+  { value: "model", label: "Model", count: 17377 },
+  { value: "layout1", label: "Layout", count: 237 },
+]
+
+export const LAYERS = [
+  { name: "0", color: "#ffffff", count: 1 },
+  { name: "CX-BORD-LIN1", color: "#00ffff", count: 30 },
+  { name: "CX-BORD-LIN2", color: "#00ff00", count: 1 },
+  { name: "CX-BORD-TEX3", color: "#ff00ff", count: 17 },
+  { name: "CX-BORD-TEX2", color: "#000000", count: 4 },
+  { name: "CX-MISC", color: "#ffff00", count: 0 },
+  { name: "CR-LEAT", color: "#00ff00", count: 4 },
+  { name: "CR-GRND", color: "#00ff00", count: 6 },
+  { name: "CR-TEXT", color: "#ff0000", count: 52 },
+]
+
+export type ViewerPanelId = "layers" | "options" | "properties"
+
+export interface ViewerOptions { lineweightOn: boolean; lineweightScale: number; grid: boolean; zoomSpeed: number; zScale: number }
+export const DEFAULT_OPTIONS: ViewerOptions = { lineweightOn: false, lineweightScale: 11, grid: false, zoomSpeed: 1, zScale: 10 }
+
+/** All UI state of the demo viewer screen + the header menu data built from it. */
+export function useViewerDemo({ initialDocument = null as string | null, initialPanels = [] as ViewerPanelId[] } = {}) {
+  const [documentName, setDocumentName] = useState<string | null>(initialDocument)
+  const [space, setSpace] = useState("model")
+  const [is25D, set25D] = useState(false)
+  const [dark, setDark] = useState(true)
+  const [panels, setPanels] = useState<Record<ViewerPanelId, boolean>>(() => ({ layers: initialPanels.includes("layers"), options: initialPanels.includes("options"), properties: initialPanels.includes("properties") }))
+  const [options, setOptions] = useState<ViewerOptions>(DEFAULT_OPTIONS)
+  const [hidden, setHidden] = useState<Set<string>>(new Set())
+  const [aboutOpen, setAboutOpen] = useState(false)
+  const [log, setLog] = useState<string[]>([])
+  const record = (line: string) => setLog(lines => [...lines.slice(-7), line])
+  const toggle = (id: ViewerPanelId, next = !panels[id]) => setPanels(current => ({ ...current, [id]: next }))
+  const loaded = documentName !== null
+
+  const groups = useMemo<SWViewerHeaderGroup[]>(() => [
+    {
+      id: "file", label: "파일", items: [
+        { type: "button", id: "open", label: "파일 열기", icon: <FolderOpen />, title: "파일 열기", iconOnlyBelow: 560, onSelect: () => record("파일 선택창 (미연결)") },
+        {
+          type: "menu", id: "samples", label: "샘플", moreLabel: "샘플 도면", collapseBelow: 1180,
+          entries: SAMPLES.map(sample => ({ type: "item" as const, id: sample.id, label: sample.label, onSelect: () => setDocumentName(sample.name) })),
+        },
+      ],
+    },
+    {
+      id: "space", label: "도면 공간", surface: "field", hidden: !loaded, items: [
+        { type: "tabs", id: "space", label: "모델과 배치 선택", moreLabel: "도면 공간", collapseBelow: 1180, value: space, options: SPACES, onValueChange: setSpace },
+      ],
+    },
+    {
+      id: "view", label: "화면 보기", surface: "field", items: [
+        { type: "button", id: "fit", label: "전체 보기", icon: <Scan />, title: "전체 도면 맞춤 (F)", iconOnlyBelow: 560, disabled: !loaded },
+        { type: "switch", id: "2.5d", label: "2.5D", checked: is25D, collapseBelow: 1180, onCheckedChange: set25D },
+        { type: "switch", id: "dark", label: "어두운 배경", checked: dark, collapseBelow: 1180, onCheckedChange: setDark },
+      ],
+    },
+    {
+      id: "panels", label: "패널", placement: "end", items: [
+        { type: "toggle", id: "layers", label: "레이어", icon: <Layers />, title: "레이어 패널 열기 / 닫기", pressed: panels.layers, collapseBelow: 900, onPressedChange: next => toggle("layers", next) },
+        { type: "toggle", id: "options", label: "설정", icon: <SlidersHorizontal />, title: "옵션 패널 열기 / 닫기", pressed: panels.options, collapseBelow: 900, onPressedChange: next => toggle("options", next) },
+        { type: "toggle", id: "properties", label: "속성", icon: <List />, title: "속성 패널 열기 / 닫기", pressed: panels.properties, collapseBelow: 900, onPressedChange: next => toggle("properties", next) },
+      ],
+    },
+  ], [loaded, space, is25D, dark, panels])
+
+  /** Trailing slot: load state + the info button that opens the modal about popup (reference LicenseNotice). */
+  const trailing = (
+    <>
+      <SWViewerStatus state={loaded ? "ready" : "idle"} detail={loaded ? `${documentName} 열림` : "deselected"} />
+      <SWViewerHeaderButton iconOnly icon={<Info />} label="정보 및 라이선스" title="정보 및 라이선스" onClick={() => { setAboutOpen(true); record("about") }} />
+    </>
+  )
+
+  const onCommand = (command: SWViewerCommand) => record(`${command.itemId}${command.id !== command.itemId ? `/${command.id}` : ""}${command.value !== undefined ? `=${String(command.value)}` : ""}`)
+
+  return {
+    documentName, setDocumentName, space, is25D, set25D, dark, setDark, panels, toggle, options, setOptions, hidden, setHidden,
+    log, record, groups, trailing, onCommand, loaded, aboutOpen, setAboutOpen,
+  }
+}
+
+export type ViewerDemo = ReturnType<typeof useViewerDemo>
+
+type PanelPlacement = Pick<SWViewerPanelProps, "strategy" | "defaultPosition" | "inset">
+
+export function LayerPanel({ demo, ...placement }: { demo: ViewerDemo } & PanelPlacement) {
+  const [query, setQuery] = useState("")
+  const filtered = LAYERS.filter(layer => layer.name.toLowerCase().includes(query.trim().toLowerCase()))
+  const set = (names: string[]) => demo.setHidden(new Set(names))
+  return (
+    <SWViewerPanel title={`레이어 (${LAYERS.length}개)`} icon={<Layers />} open={demo.panels.layers} onClose={() => demo.toggle("layers", false)} {...placement}>
+      <SWViewerSection surface="plain" aria-label="레이어 목록">
+        <div className="sw-viewer-story-toolbar">
+          <SWViewerInput type="search" placeholder="레이어 검색" aria-label="레이어 검색" value={query} onChange={event => setQuery(event.currentTarget.value)} />
+          <SWViewerButton onClick={() => set([])}>전체 켜기</SWViewerButton>
+          <SWViewerButton onClick={() => set(LAYERS.map(layer => layer.name))}>전체 끄기</SWViewerButton>
+        </div>
+        {filtered.length === 0 ? <SWViewerHint>검색 결과가 없습니다 ("{query}")</SWViewerHint> : (
+          <ul className="sw-viewer-story-list">
+            {filtered.map(layer => {
+              const visible = !demo.hidden.has(layer.name)
+              return (
+                <li key={layer.name} data-visible={visible}>
+                  <span className="sw-viewer-story-swatch" style={{ background: layer.color }} aria-hidden="true" />
+                  <span className="sw-viewer-story-name" title={layer.name}>{layer.name}</span>
+                  <SWViewerBadge>{layer.count}</SWViewerBadge>
+                  <button type="button" className="sw-viewer-story-eye" aria-label={`${layer.name} ${visible ? "숨기기" : "표시하기"}`} title={visible ? "숨기기" : "표시하기"}
+                    onClick={() => {
+                      const next = new Set(demo.hidden)
+                      if (visible) next.add(layer.name); else next.delete(layer.name)
+                      demo.setHidden(next)
+                      demo.record(`layer:${layer.name}=${!visible}`)
+                    }}>{visible ? <Eye size={16} /> : <EyeOff size={16} />}</button>
+                </li>
+              )
+            })}
+          </ul>
+        )}
+      </SWViewerSection>
+    </SWViewerPanel>
+  )
+}
+
+function SliderRow({ label, value, min, max, step, disabled, onChange }: { label: string; value: number; min: number; max: number; step: number; disabled?: boolean; onChange: (value: number) => void }) {
+  return (
+    <SWViewerField label={label} layout="stacked" disabled={disabled}
+      below={<SWViewerSlider aria-label={label} value={value} min={min} max={max} step={step} onValueChange={onChange} />}>
+      {id => <SWViewerInput id={id} type="number" min={min} max={max} step={step} value={value} onChange={event => { const next = Number(event.currentTarget.value); if (Number.isFinite(next)) onChange(next) }} />}
+    </SWViewerField>
+  )
+}
+
+export function OptionsPanel({ demo, footer, ...placement }: { demo: ViewerDemo; footer?: boolean } & PanelPlacement) {
+  const { options, setOptions } = demo
+  const set = (patch: Partial<ViewerOptions>) => setOptions({ ...options, ...patch })
+  return (
+    <SWViewerPanel title="옵션" icon={<SlidersHorizontal />} open={demo.panels.options} onClose={() => demo.toggle("options", false)} width={340} height={520} {...placement}
+      headerActions={<SWViewerButton variant="ghost" aria-label="기본값으로" title="기본값으로" onClick={() => { setOptions(DEFAULT_OPTIONS); demo.record("options:reset") }}><RotateCcw size={16} /></SWViewerButton>}
+      footer={footer ? <><SWViewerButton onClick={() => demo.toggle("options", false)}>취소</SWViewerButton><SWViewerButton variant="primary" onClick={() => { demo.record("options:apply"); demo.toggle("options", false) }}>적용</SWViewerButton></> : undefined}>
+      <SWViewerSection title="선가중치">
+        <SWViewerField label="표시 사용">{id => <SWViewerSwitch id={id} checked={options.lineweightOn} onCheckedChange={lineweightOn => set({ lineweightOn })} />}</SWViewerField>
+        <SliderRow label="표시 배율 (px/mm)" value={options.lineweightScale} min={2} max={60} step={0.5} onChange={lineweightScale => set({ lineweightScale })} />
+        <SWViewerHint>이 도면에는 굵은 선이 없습니다 (0.50mm 였다면 {(0.5 * options.lineweightScale).toFixed(1)}px)</SWViewerHint>
+        <SWViewerHint>AutoCAD의 "선가중치 설정 → 표시 배율"과 동일합니다.</SWViewerHint>
+      </SWViewerSection>
+      <SWViewerSection title="표시">
+        <SWViewerField label="그리드">{id => <SWViewerSwitch id={id} checked={options.grid} onCheckedChange={grid => set({ grid })} />}</SWViewerField>
+        <SliderRow label="줌 속도" value={options.zoomSpeed} min={0.2} max={3} step={0.1} onChange={zoomSpeed => set({ zoomSpeed })} />
+      </SWViewerSection>
+      <SWViewerSection title="2.5D">
+        <SWViewerField label="2.5D 보기">{id => <SWViewerSwitch id={id} checked={demo.is25D} onCheckedChange={demo.set25D} />}</SWViewerField>
+        <SliderRow label="Z 높이 배율" value={options.zScale} min={1} max={50} step={0.5} disabled={!demo.is25D} onChange={zScale => set({ zScale })} />
+        <SWViewerHint>좌클릭 드래그로 회전, 중간/우클릭 드래그로 이동합니다.</SWViewerHint>
+      </SWViewerSection>
+    </SWViewerPanel>
+  )
+}
+
+const ENTITY_ROWS: [string, string][] = [["유형", "LINE"], ["레이어", "CX-BORD-LIN1"], ["색상", "ByLayer"], ["선종류", "Continuous"]]
+const GEOMETRY_ROWS: [string, string][] = [["시작 X", "18432.512"], ["시작 Y", "2210.004"], ["끝 X", "18992.040"], ["끝 Y", "2210.004"], ["길이", "559.528"]]
+
+export function PropertiesPanel({ demo, selected = true, ...placement }: { demo: ViewerDemo; selected?: boolean } & PanelPlacement) {
+  const rows = (items: [string, string][]) => (
+    <dl className="sw-viewer-story-props">{items.map(([key, value]) => <div key={key}><dt>{key}</dt><dd title={value}>{value}</dd></div>)}</dl>
+  )
+  return (
+    <SWViewerPanel title="속성" icon={<Info />} open={demo.panels.properties} onClose={() => demo.toggle("properties", false)} {...placement}
+      headerActions={selected ? <SWViewerButton variant="ghost" aria-label="선택 확대" title="선택 확대" onClick={() => demo.record("zoomToSelection (미연결)")}><ZoomIn size={16} /></SWViewerButton> : undefined}>
+      {selected ? <>
+        <SWViewerSection surface="plain" title="일반 정보 (General)"><SWViewerBadge>LINE · h=2F1A</SWViewerBadge>{rows(ENTITY_ROWS)}</SWViewerSection>
+        <SWViewerSection surface="plain" title="기하 속성 (Geometry)">{rows(GEOMETRY_ROWS)}</SWViewerSection>
+      </> : (
+        <div className="sw-viewer-story-empty"><MousePointerClick size={24} aria-hidden="true" />도면에서 객체(엔티티)를 클릭하면<br />상세 속성이 표시됩니다</div>
+      )}
+    </SWViewerPanel>
+  )
+}
diff --git a/src/sw/sw-viewer-stories.css b/src/sw/sw-viewer-stories.css
new file mode 100644
index 0000000..a1b85cf
--- /dev/null
+++ b/src/sw/sw-viewer-stories.css
@@ -0,0 +1,33 @@
+/* Story-owned layout for SW/Viewer. Like a consuming program it arranges public components and its own list
+   content; it never styles hm-sw-* classes. Panel content colors read the public --hm-sw-viewer-* tokens. */
+.sw-viewer-story-frame { position: relative; display: flex; flex-direction: column; overflow: hidden; background: #0a0a0b; }
+.sw-viewer-story-canvas {
+  position: relative;
+  flex: 1;
+  min-height: 0;
+  background:
+    linear-gradient(rgba(38, 102, 81, 0.18) 1px, transparent 1px) 0 0 / 40px 40px,
+    linear-gradient(90deg, rgba(38, 102, 81, 0.18) 1px, transparent 1px) 0 0 / 40px 40px,
+    #0a0a0b;
+}
+.sw-viewer-story-room { padding-bottom: 320px; }
+.sw-viewer-story-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 12px 4px; }
+.sw-viewer-story-toolbar > input { flex: 1 0 100%; }
+.sw-viewer-story-list { display: flex; flex-direction: column; gap: 4px; margin: 0; padding: 0; list-style: none; }
+.sw-viewer-story-list li { display: flex; align-items: center; gap: 8px; padding: 4px 6px; border-radius: 3px; }
+.sw-viewer-story-list li:hover { background: rgba(154, 146, 132, 0.25); }
+.sw-viewer-story-list li[data-visible="false"] { opacity: 0.45; }
+.sw-viewer-story-swatch { flex: 0 0 10px; width: 10px; height: 10px; border: 1px solid var(--hm-sw-viewer-panel-inner-border); border-radius: 9999px; }
+.sw-viewer-story-name { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-family: ui-monospace, monospace; font-size: 12px; }
+.sw-viewer-story-eye { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 4px; color: var(--hm-sw-viewer-panel-heading); }
+.sw-viewer-story-eye:hover { background: rgba(154, 146, 132, 0.3); }
+.sw-viewer-story-props { margin: 0; }
+.sw-viewer-story-props > div { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-bottom: 1px solid var(--hm-sw-viewer-panel-inner-border); font-size: 12px; }
+.sw-viewer-story-props dt { color: var(--hm-sw-viewer-panel-label); }
+.sw-viewer-story-props dd { margin: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-family: ui-monospace, monospace; user-select: all; }
+.sw-viewer-story-empty { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 40px 0; text-align: center; font-size: 12px; color: var(--hm-sw-viewer-panel-label); }
+.sw-viewer-story-steps { margin: 0; padding-left: 20px; font-size: 14px; }
+.sw-viewer-story-select { height: 28px; padding: 0 8px; border: 1px solid var(--hm-sw-viewer-panel-inner-border); border-radius: 4px; background: var(--hm-sw-viewer-panel-field-background); font: inherit; font-size: 12px; }
+.sw-viewer-story-reopen { position: absolute; left: 712px; top: 16px; padding: 6px 10px; border-radius: 4px; background: #f5f0e5; font-size: 12px; }
+.sw-viewer-story-context { display: flex; align-items: center; justify-content: center; height: 160px; border: 1px dashed #9a9284; border-radius: 4px; background: #f5f0e5; color: #3e3523; font-size: 13px; }
+.sw-viewer-story-mode { display: flex; gap: 16px; margin-bottom: 8px; font-size: 13px; }
diff --git a/src/sw/sw-viewer.stories.tsx b/src/sw/sw-viewer.stories.tsx
new file mode 100644
index 0000000..1195d4b
--- /dev/null
+++ b/src/sw/sw-viewer.stories.tsx
@@ -0,0 +1,400 @@
+import { useRef, useState, type ReactNode } from "react"
+import type { Meta, StoryObj } from "@storybook/react-vite"
+import {
+  SWHeader, SWViewerButton, SWViewerField, SWViewerHeader, SWViewerHint, SWViewerInput, SWViewerMenu, SWViewerPanel, SWViewerSection, SWViewerSwitch,
+  type SWViewerHeaderGroup, type SWViewerMenuEntry,
+} from "@hm-design/sw"
+import "@hm-design/sw/styles.css"
+import { Copy, Download, FileText, FolderOpen, Layers, Printer, Ruler, Scan, Search, Settings2 } from "lucide-react"
+import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
+import { LAYERS, LayerPanel, OptionsPanel, PropertiesPanel, SAMPLES, useViewerDemo, type ViewerDemo } from "./sw-viewer-fixture"
+import "./sw-stories.css"
+import "./sw-viewer-stories.css"
+import placeholderLogo from "./assets/sw-header-logo-placeholder.svg"
+
+// SW viewer mode (2026-10-19): the reference DWG/DXF viewer top menu and popups as package components.
+// Stories use the public @hm-design/sw API only, like a consuming program. No DWG/DXF engine: commands are logged.
+const KICKER = "HM DESIGN SYSTEM / SW"
+
+const meta = {
+  title: "SW/Viewer",
+  parameters: { layout: "fullscreen", controls: { disable: true } },
+} satisfies Meta
+export default meta
+type Story = StoryObj<typeof meta>
+
+function Log({ lines }: { lines: string[] }) {
+  return <p className="sw-story-log" aria-live="polite" data-callback-log="">Command: {lines.length ? lines.join(" → ") : "없음"}</p>
+}
+
+/** A viewer screen: header on top, the drawing area below it (panels are placed inside this frame). */
+function ViewerFrame({ width = 1440, height = 620, children, header }: { width?: number; height?: number; header: ReactNode; children?: ReactNode }) {
+  return (
+    <div className="sw-story-scroller">
+      {/* Fills the Story column up to `width`, so panels placed at the right edge stay visible. */}
+      <div className="sw-viewer-story-frame" style={{ width: "100%", maxWidth: width, height }} data-viewer-frame="">
+        {header}
+        <div className="sw-viewer-story-canvas" aria-label="도면 영역 (예시)">{children}</div>
+      </div>
+    </div>
+  )
+}
+
+function AboutPanel({ demo }: { demo: ViewerDemo }) {
+  return (
+    <SWViewerPanel modal strategy="absolute" title="모듈 구성 · 라이선스 고지" open={demo.aboutOpen} onClose={() => demo.setAboutOpen(false)} width={420} height="auto" resizable={false} collapsible={false}
+      footer={<SWViewerButton variant="primary" onClick={() => demo.setAboutOpen(false)}>확인</SWViewerButton>}>
+      <SWViewerSection title="처리 파이프라인">
+        <ol className="sw-viewer-story-steps">
+          <li>파일 로드 (.dwg → acadrust WASM, .dxf → dxf-parser)</li>
+          <li>CAD 파싱 결과 정규화 (레이어 / 스페이스 / 엔티티)</li>
+          <li>Three.js 씬 구성 및 렌더링</li>
+        </ol>
+      </SWViewerSection>
+      <SWViewerHint>Storybook 예시: 링크와 실제 고지문은 프로그램이 제공합니다.</SWViewerHint>
+    </SWViewerPanel>
+  )
+}
+
+function ViewerScreen({ width = 1440, initialDocument = SAMPLES[1].name as string | null, open = [] as ("layers" | "options" | "properties")[] }) {
+  const demo = useViewerDemo({ initialDocument, initialPanels: open })
+  return (
+    <>
+      <Log lines={demo.log} />
+      <ViewerFrame width={width} header={<SWViewerHeader documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} />}>
+        <LayerPanel demo={demo} strategy="absolute" />
+        <OptionsPanel demo={demo} strategy="absolute" inset={{ side: 356 }} />
+        <PropertiesPanel demo={demo} strategy="absolute" inset={{ side: 24, top: 488 }} />
+        <AboutPanel demo={demo} />
+      </ViewerFrame>
+    </>
+  )
+}
+
+export const ViewerHeader: Story = {
+  name: "Viewer Header",
+  render: () => (
+    <StoryPage>
+      <StoryPageHeader kicker={KICKER} title="SW Viewer — SWViewerHeader"
+        description="참고 DWG/DXF 뷰어의 상단 메뉴를 패키지 컴포넌트로 옮긴 뷰어 모드 전용 Header입니다. 로고 면 → 파일명 면 → 객체 수정 면(메뉴 그룹) → 오른쪽 패널·상태·정보 영역이며, 메뉴는 groups 데이터로 구성합니다. 레이어·설정·속성 토글은 팝업을 열고, 정보 버튼은 모달 팝업을 엽니다." />
+      <StorySection title="기본형 (1440px, 도면 열림)" description="샘플▾ Dropdown, Model/Layout 탭, 2.5D·어두운 배경 스위치, 패널 토글을 직접 눌러 보세요. Command 줄에 onCommand 결과가 표시됩니다.">
+        <ViewerScreen />
+      </StorySection>
+    </StoryPage>
+  ),
+}
+
+export const MenuGroups: Story = {
+  name: "Menu Groups",
+  render: () => {
+    const demo = useViewerDemo({ initialDocument: SAMPLES[1].name })
+    const pick = (ids: string[]): SWViewerHeaderGroup[] => demo.groups.map(group => ({ ...group, hidden: group.hidden || !ids.includes(group.id) }))
+    const rows: { title: string; ids: string[] }[] = [
+      { title: "파일 그룹만 (파일 열기 · 샘플)", ids: ["file"] },
+      { title: "도면 공간 (field 면 · tabs)", ids: ["space"] },
+      { title: "화면 보기 (field 면 · button + switch)", ids: ["view"] },
+      { title: "오른쪽 영역 (placement=end 패널 토글 + trailing 상태 · 정보)", ids: ["panels"] },
+      { title: "전체", ids: demo.groups.map(group => group.id) },
+    ]
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 메뉴 그룹" description="그룹은 groups 배열의 순서대로 놓입니다. surface=&quot;field&quot;는 사용자 확정 속성 입력 면(어두운 inset), placement=&quot;end&quot;는 오른쪽 끝 영역입니다. hidden으로 그룹·항목을 제거합니다." />
+        <Log lines={demo.log} />
+        <div className="sw-story-stack">
+          {rows.map(row => (
+            <StorySection key={row.title} title={row.title}>
+              <div className="sw-story-scroller"><div style={{ width: 1440 }}><SWViewerHeader documentTitle={demo.documentName} groups={pick(row.ids)} trailing={row.ids.includes("panels") ? demo.trailing : undefined} onCommand={demo.onCommand} /></div></div>
+            </StorySection>
+          ))}
+        </div>
+      </StoryPage>
+    )
+  },
+}
+
+export const States: Story = {
+  name: "Item States",
+  render: () => {
+    const [log, setLog] = useState<string[]>([])
+    const record = (line: string) => setLog(lines => [...lines.slice(-7), line])
+    const groups: SWViewerHeaderGroup[] = [
+      {
+        id: "states", label: "상태 예시", items: [
+          { type: "button", id: "default", label: "기본", icon: <FolderOpen /> },
+          { type: "toggle", id: "active", label: "Active (on)", icon: <Layers />, pressed: true },
+          { type: "toggle", id: "inactive", label: "Toggle (off)", icon: <Layers />, pressed: false },
+          { type: "button", id: "disabled", label: "Disabled", icon: <Scan />, disabled: true },
+          { type: "menu", id: "menu", label: "Dropdown", entries: [{ type: "item", id: "a", label: "항목 A" }, { type: "item", id: "b", label: "항목 B (disabled)", disabled: true }] },
+          { type: "menu", id: "menu-disabled", label: "Dropdown (disabled)", disabled: true, entries: [] },
+        ],
+      },
+      {
+        id: "field", label: "field 면", surface: "field", items: [
+          { type: "tabs", id: "tabs", label: "탭", value: "model", options: [{ value: "model", label: "Model", count: 17377 }, { value: "layout", label: "Layout", count: 237 }, { value: "off", label: "Disabled", disabled: true }] },
+          { type: "switch", id: "on", label: "Switch on", checked: true },
+          { type: "switch", id: "off", label: "Switch off", checked: false },
+          { type: "switch", id: "sw-disabled", label: "Disabled", checked: false, disabled: true },
+        ],
+      },
+    ]
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — Active / Hover / Disabled"
+          description="Hover: #266651 면, Active·열림·선택 탭: 글자와 아이콘 #FFC600(선택 박스 없음), Disabled: 60% 불투명, Focus: 2px #FFC600 외곽선(키보드). Hover와 Focus는 마우스·Tab으로 확인합니다." />
+        <Log lines={log} />
+        <div className="sw-story-scroller"><div style={{ width: 1440 }}>
+          <SWViewerHeader documentTitle="상태 확인용.dwg" groups={groups} onCommand={command => record(`${command.id}${command.value !== undefined ? `=${String(command.value)}` : ""}`)} />
+        </div></div>
+      </StoryPage>
+    )
+  },
+}
+
+const MENU_ENTRIES: SWViewerMenuEntry[] = [
+  { type: "label", id: "l-file", label: "파일" },
+  { type: "item", id: "open", label: "파일 열기", icon: <FolderOpen size={16} />, shortcut: "Ctrl+O" },
+  {
+    type: "submenu", id: "recent", label: "최근 도면", icon: <FileText size={16} />, entries: [
+      ...SAMPLES.map(sample => ({ type: "item" as const, id: `recent:${sample.id}`, label: sample.name })),
+      { type: "separator", id: "s-recent" },
+      { type: "submenu", id: "recent-more", label: "보관 도면", entries: [{ type: "item", id: "archive:2025", label: "2025-평면도.dwg" }, { type: "item", id: "archive:2024", label: "2024-종단면도.dwg" }] },
+    ],
+  },
+  { type: "item", id: "export", label: "PNG로 내보내기", icon: <Download size={16} /> },
+  { type: "item", id: "print", label: "인쇄 (미연결)", icon: <Printer size={16} />, disabled: true },
+  { type: "separator", id: "s1" },
+  { type: "label", id: "l-view", label: "화면 보기" },
+  { type: "checkbox", id: "grid", label: "그리드", checked: true },
+  { type: "checkbox", id: "lineweight", label: "선가중치 표시", checked: false },
+  { type: "separator", id: "s2" },
+  { type: "label", id: "l-unit", label: "단위" },
+  { type: "radio", id: "unit:mm", label: "mm", checked: true },
+  { type: "radio", id: "unit:m", label: "m", checked: false },
+]
+
+export const Dropdowns: Story = {
+  name: "Header + Dropdown",
+  render: () => {
+    const [entries, setEntries] = useState(MENU_ENTRIES)
+    const [log, setLog] = useState<string[]>([])
+    const record = (line: string) => setLog(lines => [...lines.slice(-7), line])
+    const apply = (entry: SWViewerMenuEntry) => setEntries(list => list.map(item => {
+      if (entry.type === "checkbox" && item.id === entry.id && item.type === "checkbox") return { ...item, checked: !item.checked }
+      if (entry.type === "radio" && item.type === "radio" && item.id.startsWith("unit:")) return { ...item, checked: item.id === entry.id }
+      return item
+    }))
+    const groups: SWViewerHeaderGroup[] = [
+      { id: "file", label: "파일", items: [{ type: "menu", id: "file", label: "도면", icon: <FileText />, entries: entries.map(entry => ({ ...entry, ...(entry.type === "checkbox" || entry.type === "radio" ? { keepOpen: false } : {}) })) }] },
+      { id: "tools", label: "도구", items: [
+        { type: "menu", id: "measure", label: "측정", icon: <Ruler />, entries: [{ type: "item", id: "distance", label: "거리" }, { type: "item", id: "area", label: "면적" }, { type: "submenu", id: "angle", label: "각도", entries: [{ type: "item", id: "angle:2", label: "두 선 사이" }, { type: "item", id: "angle:3", label: "세 점" }] }] },
+        { type: "menu", id: "align-end", label: "오른쪽 정렬 메뉴", menuAlign: "end", menuWidth: 220, entries: [{ type: "item", id: "copy", label: "좌표 복사", icon: <Copy size={16} /> }, { type: "item", id: "find", label: "객체 찾기", icon: <Search size={16} /> }] },
+      ] },
+    ]
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 상단 메뉴 + Dropdown"
+          description="type=&quot;menu&quot; 항목의 entries가 Dropdown이 됩니다. 일반 항목·체크·라디오·라벨·구분선·다단계 서브메뉴(submenu)를 지원합니다. 키보드: Enter/↓ 열기, ↑↓ 이동, → 서브메뉴, ← 닫기, Esc 닫고 버튼으로 복귀, 바깥 클릭 닫기." />
+        <Log lines={log} />
+        <div className="sw-story-scroller sw-viewer-story-room"><div style={{ width: 1440 }}>
+          <SWViewerHeader documentTitle="C0060202-001-평면및종단면도.dwg" groups={groups}
+            onCommand={command => { const entry = findEntry(entries, command.id); if (entry) apply(entry); record(`${command.itemId}/${command.id}${command.value !== undefined ? `=${String(command.value)}` : ""}`) }} />
+        </div></div>
+        <StorySection title="SWViewerMenu 단독 (Context Menu)" description="anchorPoint로 지정 위치에 엽니다. 아래 영역을 마우스 오른쪽 버튼으로 클릭하세요.">
+          <ContextMenuDemo onSelect={line => record(line)} />
+        </StorySection>
+      </StoryPage>
+    )
+  },
+}
+
+function findEntry(entries: SWViewerMenuEntry[], id: string): SWViewerMenuEntry | undefined {
+  for (const entry of entries) {
+    if (entry.id === id) return entry
+    if (entry.type === "submenu") { const found = findEntry(entry.entries, id); if (found) return found }
+  }
+  return undefined
+}
+
+function ContextMenuDemo({ onSelect }: { onSelect: (line: string) => void }) {
+  const [point, setPoint] = useState<{ x: number; y: number } | null>(null)
+  return (
+    <div className="sw-viewer-story-context" onContextMenu={event => { event.preventDefault(); setPoint({ x: event.clientX, y: event.clientY }) }} data-context-area="">
+      도면 영역 (오른쪽 클릭)
+      <SWViewerMenu open={point !== null} onOpenChange={open => { if (!open) setPoint(null) }} anchorPoint={point ?? undefined} label="도면 메뉴" initialFocus="menu"
+        entries={[
+          { type: "item", id: "fit", label: "전체 보기", shortcut: "F" },
+          { type: "item", id: "zoom-selection", label: "선택 확대" },
+          { type: "separator", id: "s" },
+          { type: "submenu", id: "layer", label: "레이어", entries: LAYERS.slice(0, 4).map(layer => ({ type: "item" as const, id: `hide:${layer.name}`, label: `${layer.name} 숨기기` })) },
+          { type: "item", id: "props", label: "속성 보기" },
+        ]}
+        onEntrySelect={entry => onSelect(`context/${entry.id}`)} />
+    </div>
+  )
+}
+
+export const SettingsPanel: Story = {
+  name: "Settings Popup",
+  render: () => {
+    const demo = useViewerDemo({ initialDocument: SAMPLES[1].name, initialPanels: ["options"] })
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 설정창 (SWViewerPanel)"
+          description="설정 토글로 여는 옵션 팝업입니다. 제목 막대를 끌어 이동, 오른쪽 아래 모서리로 크기 조절, 제목 더블클릭·접기 버튼으로 접기, 닫기·Esc(팝업 안 Focus)로 닫습니다. 하단 버튼 영역(footer)을 포함한 예시입니다." />
+        <Log lines={demo.log} />
+        <ViewerFrame header={<SWViewerHeader documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} />}>
+          <OptionsPanel demo={demo} strategy="absolute" footer />
+        </ViewerFrame>
+      </StoryPage>
+    )
+  },
+}
+
+export const ContentVariants: Story = {
+  name: "Popup Content Variants",
+  render: () => {
+    const demo = useViewerDemo({ initialDocument: SAMPLES[1].name, initialPanels: ["layers", "properties"] })
+    const [inputOpen, setInputOpen] = useState(true)
+    const [scale, setScale] = useState("1:500")
+    const [snap, setSnap] = useState(true)
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 같은 프레임, 다른 내부 콘텐츠"
+          description="SWViewerPanel의 외형(제목 막대·닫기·테두리·스크롤 본문)은 같고 children / footer만 다릅니다: 검색 + 목록(레이어), 읽기 전용 정의 목록(속성), 입력 폼 + 하단 버튼(입력 팝업)." />
+        <Log lines={demo.log} />
+        <ViewerFrame height={640} header={<SWViewerHeader documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} />}>
+          <LayerPanel demo={demo} strategy="absolute" defaultPosition={{ left: 24, top: 16 }} />
+          <PropertiesPanel demo={demo} strategy="absolute" defaultPosition={{ left: 368, top: 16 }} />
+          <SWViewerPanel strategy="absolute" defaultPosition={{ left: 712, top: 16 }} title="축척 지정" icon={<Settings2 />} open={inputOpen} onClose={() => setInputOpen(false)} width={300} height="auto" resizable={false}
+            footer={<><SWViewerButton onClick={() => setInputOpen(false)}>취소</SWViewerButton><SWViewerButton variant="primary" onClick={() => { demo.record(`scale=${scale}, snap=${snap}`); setInputOpen(false) }}>적용</SWViewerButton></>}>
+            <SWViewerSection title="입력">
+              <SWViewerField label="축척">{id => <SWViewerInput id={id} value={scale} onChange={event => setScale(event.currentTarget.value)} style={{ width: 120 }} />}</SWViewerField>
+              <SWViewerField label="스냅 사용">{id => <SWViewerSwitch id={id} checked={snap} onCheckedChange={setSnap} />}</SWViewerField>
+              <SWViewerField label="단위">{id => <select id={id} className="sw-viewer-story-select" defaultValue="mm"><option value="mm">mm</option><option value="m">m</option></select>}</SWViewerField>
+            </SWViewerSection>
+          </SWViewerPanel>
+          {!inputOpen && <button type="button" className="sw-viewer-story-reopen" onClick={() => setInputOpen(true)}>축척 지정 다시 열기</button>}
+        </ViewerFrame>
+      </StoryPage>
+    )
+  },
+}
+
+export const VariableSize: Story = {
+  name: "Variable Size Popups",
+  render: () => {
+    const sizes: { id: string; title: string; width: number; height: number | "auto"; left: number; note: string }[] = [
+      { id: "s", title: "250 × auto (최소 폭)", width: 250, height: "auto", left: 16, note: "내용 높이" },
+      { id: "m", title: "320 × 420 (기본)", width: 320, height: 420, left: 282, note: "본문 스크롤" },
+      { id: "l", title: "480 × 300 (가로형)", width: 480, height: 300, left: 618, note: "resize: both" },
+    ]
+    const [open, setOpen] = useState<Record<string, boolean>>({ s: true, m: true, l: true })
+    const lines = Array.from({ length: 24 }, (_, index) => `행 ${index + 1}`)
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 가변 크기 팝업"
+          description="width / height(&quot;auto&quot; 가능) / minWidth / minHeight로 메뉴별 크기를 정합니다. 최대 90vw × 90vh, 오른쪽 아래 모서리로 크기 조절, 화면(또는 strategy=&quot;absolute&quot;의 부모) 경계 안에서만 이동합니다." />
+        <ViewerFrame height={520} header={<SWViewerHeader documentTitle="크기 비교.dwg" groups={[]} />}>
+          {sizes.map(size => (
+            <SWViewerPanel key={size.id} strategy="absolute" defaultPosition={{ left: size.left, top: 16 }} title={size.title} open={open[size.id]} onClose={() => setOpen({ ...open, [size.id]: false })} width={size.width} height={size.height}>
+              <SWViewerHint>{size.note}</SWViewerHint>
+              <SWViewerSection surface="plain">{(size.height === "auto" ? lines.slice(0, 3) : lines).map(line => <div key={line}>{line}</div>)}</SWViewerSection>
+            </SWViewerPanel>
+          ))}
+        </ViewerFrame>
+      </StoryPage>
+    )
+  },
+}
+
+export const Responsive: Story = {
+  name: "Responsive Widths",
+  render: () => {
+    const demo = useViewerDemo({ initialDocument: SAMPLES[1].name })
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 화면 너비"
+          description="참고 뷰어와 같은 기준입니다. Header 폭 1180px 미만: 샘플·도면 공간·2.5D·어두운 배경이 더보기(⋯)로 이동, 900px 미만: 패널 토글도 이동, 560px 미만: 파일 열기·전체 보기는 아이콘만, 상태 글자 숨김. 가로 스크롤은 만들지 않습니다." />
+        <Log lines={demo.log} />
+        <div className="sw-story-stack">
+          {[1440, 1100, 860, 520].map(width => (
+            <StorySection key={width} title={`${width}px`}>
+              <div className="sw-story-scroller"><div style={{ width }} data-width={width}><SWViewerHeader documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} /></div></div>
+            </StorySection>
+          ))}
+        </div>
+      </StoryPage>
+    )
+  },
+}
+
+function ModeSwitchDemo() {
+  const [mode, setMode] = useState<"normal" | "viewer">("normal")
+  const demo = useViewerDemo({ initialDocument: SAMPLES[1].name })
+  const headerRef = useRef<HTMLElement>(null)
+  return (
+    <>
+      <div className="sw-viewer-story-mode" role="radiogroup" aria-label="모드">
+        {(["normal", "viewer"] as const).map(value => (
+          <label key={value}><input type="radio" name="sw-mode" checked={mode === value} onChange={() => setMode(value)} /> {value === "normal" ? "일반 SW 모드 (SWHeader)" : "뷰어 모드 (SWViewerHeader)"}</label>
+        ))}
+      </div>
+      <Log lines={demo.log} />
+      <ViewerFrame height={480} header={mode === "normal"
+        ? <SWHeader ref={headerRef} documentTitle={demo.documentName ?? ""} logoSrc={placeholderLogo} logoAlt="임시 로고 (뷰어 모드로)" onHomeClick={() => setMode("viewer")} />
+        : <SWViewerHeader ref={headerRef} documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} logoSrc={placeholderLogo} logoAlt="임시 로고 (일반 모드로)" onHomeClick={() => setMode("normal")} />}>
+        {mode === "viewer" && <><LayerPanel demo={demo} strategy="absolute" /><OptionsPanel demo={demo} strategy="absolute" inset={{ side: 356 }} /></>}
+      </ViewerFrame>
+    </>
+  )
+}
+
+export const CompareWithSWHeader: Story = {
+  name: "SWHeader vs Viewer Header",
+  render: () => (
+    <StoryPage>
+      <StoryPageHeader kicker={KICKER} title="SW Viewer — 일반 SW Header와 비교"
+        description="일반 SW 모드는 기존 SWHeader(49px, Figma 26:8944)를 그대로 쓰고, 뷰어 모드만 SWViewerHeader(52px, 참고 뷰어)를 씁니다. 두 Header는 파일명·객체 수정·속성 면 토큰을 공유합니다. 아래 전환 예시는 화면 상태(파일명·패널 상태)를 유지한 채 Header만 바꿉니다. 예시에서는 SWHeader 로고(임시)를 누르면 뷰어 모드, 뷰어 로고(임시)를 누르면 일반 모드로 돌아갑니다." />
+      <StorySection title="나란히 비교 (1440px)">
+        <div className="sw-story-stack">
+          <div className="sw-story-scroller"><div style={{ width: 1440 }}><SWHeader documentTitle="C0060202-001-평면및종단면도" /></div></div>
+          <div className="sw-story-scroller"><div style={{ width: 1440 }}><ViewerOnly /></div></div>
+        </div>
+      </StorySection>
+      <StorySection title="일반 ↔ 뷰어 모드 전환" description="Header 교체만 보여 주는 UI 예시입니다. 실제 모드 진입·종료와 데이터 처리는 SW 프로그램 담당입니다.">
+        <ModeSwitchDemo />
+      </StorySection>
+    </StoryPage>
+  ),
+}
+
+export const Logo: Story = {
+  name: "Logo",
+  render: () => {
+    const demo = useViewerDemo({ initialDocument: SAMPLES[1].name })
+    const rows: { title: string; description: string; props: { logoSrc?: string; logo?: ReactNode; logoAlt?: string } }[] = [
+      { title: "로고 없음 (기본)", description: "logo / logoSrc를 넘기지 않으면 아무것도 그리지 않습니다(HM 문자·기본 아이콘 없음). 로고 면은 사선 끝(24px)만 남아 넓은 빈 공간이 생기지 않습니다.", props: {} },
+      { title: "logoSrc (이미지 URL)", description: "SWHeader와 같은 Prop. 로고 면 72px(로고가 더 넓으면 그만큼), 높이 최대 24px.", props: { logoSrc: placeholderLogo, logoAlt: "임시 로고" } },
+      { title: "logo (요소)", description: "logo가 logoSrc보다 우선합니다.", props: { logo: <svg viewBox="0 0 32 17" width="32" height="17" aria-hidden="true"><rect x="0.5" y="0.5" width="31" height="16" rx="3" fill="none" stroke="#fff" /><text x="16" y="12.5" fill="#fff" fontSize="10" fontWeight="700" textAnchor="middle">LOGO</text></svg>, logoAlt: "예시 로고" } },
+    ]
+    return (
+      <StoryPage>
+        <StoryPageHeader kicker={KICKER} title="SW Viewer — 로고" description="로고는 각 프로그램이 정합니다. 제공된 경우에만 표시하고, Header 높이(52px)와 메뉴 정렬은 그대로입니다. SWHeader의 로고 동작은 바뀌지 않습니다." />
+        <div className="sw-story-stack">
+          {rows.map(row => (
+            <StorySection key={row.title} title={row.title} description={row.description}>
+              <div className="sw-story-scroller"><div style={{ width: 1440 }} data-logo-case={row.title}>
+                <SWViewerHeader {...row.props} documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} />
+              </div></div>
+            </StorySection>
+          ))}
+        </div>
+      </StoryPage>
+    )
+  },
+}
+
+function ViewerOnly() {
+  const demo = useViewerDemo({ initialDocument: SAMPLES[1].name })
+  return <SWViewerHeader documentTitle={demo.documentName} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} />
+}