feat(storybook): refine Manager LNB, HM Color and Patterns/Layout/LNB

- Manager LNB: 246px width, 16px brand title, 14px/700 menu and section
  titles, depth1 48px / depth2+ 42px rows, 24px section gap
- Foundation: rename Color to HM Color (Story ID foundation-color--all kept),
  remove Company Colors subtitle and the page-title bottom border
- Patterns/Layout/LNB: Storybook-only overrides in lnb.stories.css
  (240px column, 212px min width, 14px menu, 48/42px rows, profile text,
  group dividers); representative board dividers per section
- Sync story inventory and docs (brand-color-steps, lnb); shared package
  defaults and tokens are unchanged

.storybook/manager.css

@@ -61,13 +61,13 @@
   background: var(--hm-fg-on-green-secondary);
 }
 #storybook-sidebar-region .sidebar-header {
-  margin: 0 20px 24px 0;
+  margin: 0 20px 0px 0;
   padding: 0;
   color: var(--color-fg-on-green-primary);
 }
 #storybook-sidebar-region .sidebar-header > div a {
   color: var(--color-fg-on-green-primary);
-  font: 700 20px/30px var(--hm-manager-font);
+  font: 700 16px/30px var(--hm-manager-font);
   white-space: normal;
   /* §6 Text Border: brand title keeps the original 1px (no shadow). */
   -webkit-text-stroke: 1px var(--effect-text-border-color);
@@ -78,7 +78,6 @@
 }
 #storybook-sidebar-region [role='search'] {
   margin-right: 20px;
-  margin-bottom: 24px;
 }
 #storybook-sidebar-region .search-field {
   min-height: 44px;
@@ -109,16 +108,16 @@
   position: relative;
   margin: 0;
   padding: 0 20px 0 0;
-  min-height: 56px;
+  min-height: 48px;
   color: var(--hm-fg-on-green-secondary);
 }
 #storybook-explorer-tree .sidebar-subheading[data-hm-section]:not([data-hm-section='0']) {
-  margin-top: 40px;
+  margin-top: 24px;
 }
 #storybook-explorer-tree .sidebar-subheading[data-hm-section]:not([data-hm-section='0'])::before {
   content: '';
   position: absolute;
-  top: -20px;
+  top: -12px;
   left: 0;
   right: 20px;
   height: 2px;
@@ -126,9 +125,9 @@
   mask-image: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent);
 }
 #storybook-explorer-tree .sidebar-subheading > button {
-  min-height: 56px;
+  min-height: 48px;
   color: inherit;
-  font: 700 16px/28px var(--hm-manager-font);
+  font: 700 14px/28px var(--hm-manager-font);
   letter-spacing: 0;
   text-transform: none;
 }
@@ -136,7 +135,7 @@
   position: relative;
   margin: 0;
   padding: 0;
-  min-height: 56px;
+  min-height: 48px;
   overflow: visible;
   border: 0;
   border-radius: 0;
@@ -163,22 +162,30 @@
   display: flex;
   align-items: center;
   gap: 12px;
-  min-height: 56px;
+  min-height: 48px;
   height: auto;
   width: 100%;
   margin: 0;
-  padding: 14px 32px 14px 18px;
+  padding: 10px 32px 10px 18px;
   border: 0;
   border-radius: 4px 0 0 4px;
   background: transparent;
   color: inherit;
-  font: 700 18px/28px var(--hm-manager-font);
+  font: 700 14px/28px var(--hm-manager-font);
   text-align: left;
   text-decoration: none;
   white-space: normal;
   overflow: visible;
   text-overflow: clip;
 }
+/* Sub rows (depth 2+): 42px (7px + 28px line + 7px), shorter than the 48px top-level rows. */
+#storybook-explorer-tree .sidebar-item:is([data-hm-depth='2'], [data-hm-depth='3'], [data-hm-depth='4']) {
+  min-height: 42px;
+}
+#storybook-explorer-tree .sidebar-item:is([data-hm-depth='2'], [data-hm-depth='3'], [data-hm-depth='4']) > :is(a[id], button[id]:not([data-testid])) {
+  min-height: 42px;
+  padding-block: 7px;
+}
 #storybook-explorer-tree .sidebar-item[data-hm-depth='2'] > :is(a[id], button[id]:not([data-testid])) {
   margin-left: 32px;
   width: calc(100% - 32px);
@@ -188,6 +195,10 @@
   margin-left: 44px;
   width: calc(100% - 44px);
 }
+/* Menu item labels and section heading labels (.sidebar-subheading) are both 14px / 700. */
+#storybook-explorer-tree .sidebar-item .hm-manager-label {
+  font-size: 14px;
+}
 #storybook-explorer-tree .hm-manager-label {
   min-width: 0;
   white-space: normal;
@@ -198,8 +209,10 @@
 }
 /* D-093 D-014 (§6 Text Border): non-selected labels, including hover and the
    yellow current parent, use the specimen's 1.5px border plus lower shadow.
-   Thickness and offset are REVIEW VALUEs. Selected labels carry no effect. */
+   Thickness and offset are REVIEW VALUEs. Selected labels carry no effect.
-#storybook-explorer-tree .sidebar-item[data-selected='false'] .hm-manager-label {
+   Section heading labels (Foundation, Components, ...) share this exact rule. */
+#storybook-explorer-tree .sidebar-item[data-selected='false'] .hm-manager-label,
+#storybook-explorer-tree .sidebar-subheading .hm-manager-label {
   -webkit-text-stroke: 1.5px var(--effect-text-border-color);
   paint-order: stroke fill;
   text-shadow: 1px 2px 1px var(--effect-text-border-color);

.storybook/manager.js

@@ -31,6 +31,9 @@ document.head.appendChild(toolbarStyle)
 addons.setConfig({
   layout: {
     showPanel: false,
+    // LNB width 246px. recentVisibleSizes keeps the same width when the sidebar is collapsed and expanded again.
+    navSize: 246,
+    recentVisibleSizes: { navSize: 246 },
   },
   theme: create({
     base: 'light',

.storybook/preview.tsx

@@ -25,7 +25,7 @@ const preview: Preview = {
         includeNames: true,
         order: [
           "Foundation",
-          ["Color", "Company Colors", "Typography", "Layout"],
+          ["HM Color", "Company Colors", "Typography", "Layout"],
           "Components",
           [
             "Form",

.storybook/qa/STORY-INVENTORY.md

@@ -499,11 +499,11 @@ Source: `src/components/tooltip.stories.tsx`; meta.tags: []
 - All — Tooltip; tags: []; PRIMARY; KEEP. Representative story or distinct reference page.
 - Open — Open; tags: ["verification"]; VERIFICATION; HIDE. Keep direct URL and tag-filter access; excluded from default sidebar.
 
-### Foundation/Color
+### Foundation/HM Color
 
 Source: `src/foundation/color.stories.tsx`; meta.tags: []
 
-- All — Color; tags: []; PRIMARY; KEEP. Representative story or distinct reference page.
+- All — HM Color; tags: []; PRIMARY; KEEP. Representative story or distinct reference page.
 
 ### Foundation/Company Colors
 

.storybook/qa/story-inventory.json

@@ -3637,13 +3637,13 @@
     },
     {
       "file": "src/foundation/color.stories.tsx",
-      "title": "Foundation/Color",
+      "title": "Foundation/HM Color",
       "metaTags": [],
       "stories": [
         {
           "id": "foundation-color--all",
           "exportName": "All",
-          "name": "Color",
+          "name": "HM Color",
           "storyTags": [],
           "effectiveTags": [],
           "category": "PRIMARY",

docs/guidelines/brand-color-steps.md

@@ -33,8 +33,8 @@ Orange Dark 1·2의 원본 Needs Review 상태와 [이전 검수 보고서](../r
 
 ## 호환성과 Storybook
 
-페이지 소개는 `한맥 브랜드 컬러`로 표시한다. 그룹 설명의 단계 순서 나열 문구는 제공하지 않으며, 개별 컬러칩의 단계명과 HEX는 유지한다.
+페이지 제목은 `HM Color`(메뉴 `Foundation > HM Color`)이며 별도 소개 문구는 표시하지 않는다. 기존 Story ID `foundation-color--all`은 `meta.id`로 유지한다. 과거 `한맥 브랜드 컬러` 소개 문구는 당시 이력이다. 그룹 설명의 단계 순서 나열 문구는 제공하지 않으며, 개별 컬러칩의 단계명과 HEX는 유지한다.
 
-[Color 대표 Story](../../src/foundation/color.stories.tsx)는 한맥그린·한맥브라운·한맥오렌지 3개 그룹에 각 8개, 총 24개 컬러칩만 표시한다. Green 8/8·Brown 8/8·Orange 8/8 확정이며 단계명·현재 HEX와 Default 기본색 강조를 유지한다. 2026-10-11 최종 표시 요청에 따라 Brown Deep, Orange Light·Mid·Dark·Deep의 별도 표시, Accent·Semantic·Gradients 섹션과 개발용 Token·CSS Variable·Runtime Key 설명은 제거한다. Legacy Button 색상과 Accent·Semantic·Gradient의 실제 Key·값·소비처는 보존한다. 기존 Component mapping을 새 값에 연결하지 않으며 public Key·Property·type·Default·API·schemaVersion 1과 서비스 partial JSON 호환성을 유지한다. [Runtime Theme](runtime-theme.md)의 geometry/상태 권한과 Designer의 기존 17개 상위 역할 입력 UI는 확대하지 않는다. 한맥오렌지의 미확정 브랜드 단계는 없다. [표시 정리 검증 기록](../reports/foundation-color-display-cleanup-2026-10-11.md).
+[HM Color 대표 Story](../../src/foundation/color.stories.tsx)는 한맥그린·한맥브라운·한맥오렌지 3개 그룹에 각 8개, 총 24개 컬러칩만 표시한다. Green 8/8·Brown 8/8·Orange 8/8 확정이며 단계명·현재 HEX와 Default 기본색 강조를 유지한다. 2026-10-11 최종 표시 요청에 따라 Brown Deep, Orange Light·Mid·Dark·Deep의 별도 표시, Accent·Semantic·Gradients 섹션과 개발용 Token·CSS Variable·Runtime Key 설명은 제거한다. Legacy Button 색상과 Accent·Semantic·Gradient의 실제 Key·값·소비처는 보존한다. 기존 Component mapping을 새 값에 연결하지 않으며 public Key·Property·type·Default·API·schemaVersion 1과 서비스 partial JSON 호환성을 유지한다. [Runtime Theme](runtime-theme.md)의 geometry/상태 권한과 Designer의 기존 17개 상위 역할 입력 UI는 확대하지 않는다. 한맥오렌지의 미확정 브랜드 단계는 없다. [표시 정리 검증 기록](../reports/foundation-color-display-cleanup-2026-10-11.md).
 
-[Company Colors Story](../../src/foundation/company-colors.stories.tsx)는 Foundation > Color와 별도 메뉴(Color 바로 아래)이며 7개 계열사·14개 컬러를 회사별로 표시한다. 데이터는 OrgChart의 기존 `companyColorPresets`를 그대로 읽고(메인 → 서브 순서, 메인은 Default 강조 재사용) HEX를 중복 정의하지 않는다. Theme 토큰·`themes/*.json`·공개 계약은 변경하지 않으며 Foundation > Color의 3그룹 24칩은 그대로다.
+[Company Colors Story](../../src/foundation/company-colors.stories.tsx)는 Foundation > HM Color와 별도 메뉴(HM Color 바로 아래)이며 7개 계열사·14개 컬러를 회사별로 표시한다(별도 소개 문구 없음). 데이터는 OrgChart의 기존 `companyColorPresets`를 그대로 읽고(메인 → 서브 순서, 메인은 Default 강조 재사용) HEX를 중복 정의하지 않는다. Theme 토큰·`themes/*.json`·공개 계약은 변경하지 않으며 Foundation > HM Color의 3그룹 24칩은 그대로다.

docs/patterns/lnb.md

@@ -230,6 +230,8 @@ viewport 높이 shell에서 모바일 Header와 main을 세로 flex로 배분할
 
 Collapsible, Navigation Menu 등 기존 primitive 코드·theme CSS는 수정하지 않았다. `primitives.css`에 `--hm-yellow-accent` 한 줄만 추가했다.
 
+**공용 패키지 기본값 vs Storybook 전용 오버라이드:** 이 문서의 공용 패키지 기본 규격(열 272px, 메뉴 18px, 행 56px 등)과 `packages/ui`·Theme Token은 변경하지 않았다. `Patterns/Layout/LNB` 대표 Story(`src/patterns/lnb.stories.tsx`)만 `src/patterns/lnb.stories.css`로 PC 열 너비 240px(1024px 이상, 최소 너비 212px), 메뉴 폰트 14px, 행 높이 depth1 48px·depth2·3 42px를 Storybook 표시용으로 덮어쓴다(`.hm-lnb-story` 범위 안에서만 적용하며 소비 프로젝트에는 영향이 없다).
+
 ## 10. 남은 차이
 
 | 항목 | 분류 |
@@ -251,4 +253,5 @@ packages/ui/src/patterns/lnb/{lnb.tsx,lnb-mobile.tsx,index.ts}
 packages/ui/src/theme/lnb.css
 packages/ui/src/theme/primitives.css  (--hm-yellow-accent)
 src/patterns/lnb.stories.tsx
+src/patterns/lnb.stories.css  (Storybook 전용 오버라이드)
 ```

src/components/story-page.css

@@ -1,5 +1,5 @@
 /* Storybook presentation only. Common page frame for representative Stories; all selectors stay inside .sb-page.
-   Inner (fluid; 16px each side up to 480px, growing to 60px at 768px; vertical gutter 16–40) and title (kicker 12 / title 28·36·700 / description, underlined) reuse Foundation / Color.
+   Inner (fluid; 16px each side up to 480px, growing to 60px at 768px; vertical gutter 16–40) and title (kicker 12 / title 28·36·700 / description, no divider below) reuse Foundation / Color.
    Section reuses the Center Graphic / 교량 split: heading + description, a divider, then the specimen. */
 .sb-page {
   --sb-page-gutter: clamp(16px, 3vw, 40px);
@@ -22,7 +22,6 @@
 
 .sb-page .sb-page-header {
   padding-bottom: 24px;
-  border-bottom: 1px solid var(--hm-sem-stroke-input-default);
   font-size: var(--hm-label-font-size);
   line-height: var(--hm-label-line-height);
   overflow-wrap: anywhere;

src/foundation/color.stories.tsx

@@ -35,12 +35,13 @@ function ColorChip({ prefix, stage, values }: { prefix: PalettePrefix; stage: Co
 
 function ColorReferencePage() {
   const values = useResolvedProperties(colorProperties)
-  return <ReferencePage title="Color" intro="한맥 브랜드 컬러">
+  return <ReferencePage title="HM Color">
     {palettes.map(palette => <ReferenceSection key={palette.name} title={palette.name} note="">
       <div className="hm-brand-color-row">{stages.map(stage => <ColorChip key={stage} prefix={palette.prefix} stage={stage} values={values} />)}</div>
     </ReferenceSection>)}
   </ReferencePage>
 }
-const meta = { title: "Foundation/Color", parameters: { layout: "fullscreen" } } satisfies Meta
+// The sidebar name is "HM Color"; `id` keeps the existing Story ID (foundation-color--all) stable.
+const meta = { title: "Foundation/HM Color", id: "foundation-color", parameters: { layout: "fullscreen" } } satisfies Meta
 export default meta
-export const All: StoryObj<typeof meta> = { name: "Color", render: () => <ColorReferencePage /> }
+export const All: StoryObj<typeof meta> = { name: "HM Color", render: () => <ColorReferencePage /> }

src/foundation/company-colors.stories.tsx

@@ -14,7 +14,7 @@ function CompanyColorChip({ label, hex, main }: { label: string; hex: string; ma
 }
 
 function CompanyColorsPage() {
-  return <ReferencePage title="Company Colors" intro="계열사 브랜드 컬러">
+  return <ReferencePage title="Company Colors">
     {companies.map(company => <ReferenceSection key={company.companyId} title={company.companyName} note="">
       <div className="hm-brand-color-row" data-company-id={company.companyId}>
         <CompanyColorChip label="메인" hex={company.primary} main />

src/patterns/lnb.stories.css

@@ -0,0 +1,113 @@
+/* Storybook presentation only: Patterns/Layout/LNB Stories. Scoped by the decorator wrapper in lnb.stories.tsx, so the shared
+   @hm-design/ui LNB Pattern, its tokens and every other Story keep their values.
+   - min-width 212px: a floor, not a fixed width. The column follows --hm-lnb-width (240px from 1024px, see below) and may be wider.
+   - menu font 14px: --hm-lnb-item-font-size is redefined for this subtree; weight (700) and line height (28px) stay.
+   - row height: depth1 48px, depth2 and deeper 42px. Heights come from min-height + vertical padding (not a fixed height), so a
+     label that wraps grows the row instead of being clipped. Current and hover only change color/background, not the height. */
+.hm-lnb-story {
+  display: contents;
+  --hm-lnb-item-font-size: 14px;
+  /* Existing variable: min-height of every item and group trigger (used by nothing else). */
+  --hm-lnb-item-min-height: 48px;
+  /* Existing variable: bottom padding of [data-slot="lnb-brand"] (22px by default; top 0 and the 30px sides are unchanged). */
+  --hm-lnb-brand-padding-bottom: 8px;
+}
+.hm-lnb-story [data-slot="lnb"] {
+  min-width: 212px;
+}
+/* PC column width 240px through the existing --hm-lnb-width (the column, the Story grid track and the menu row offset all read it).
+   Only from 1024px: the package sets --hm-lnb-width to 0px below that and collapses the column, which must keep working. */
+@media (min-width: 1024px) {
+  .hm-lnb-story {
+    --hm-lnb-width: 240px;
+  }
+}
+
+/* Profile text (PC column): name (strong) 14px, description (p) 12px with no top margin, both 700. The package's existing 1px text
+   stroke on strong/p stays as is; the color and the 1.5 line-height ratio are unchanged (21px + 18px lines in the 48px profile).
+   The sizes use the existing profile variables; the container gets the name size. */
+.hm-lnb-story {
+  --hm-lnb-profile-name-size: 14px;
+  --hm-lnb-profile-description-size: 12px;
+}
+.hm-lnb-story [data-slot="lnb"] [data-slot="lnb-profile-text"] {
+  font-size: 14px;
+}
+.hm-lnb-story [data-slot="lnb"] [data-slot="lnb-profile-text"] :is(strong, p) {
+  font-weight: 700;
+}
+.hm-lnb-story [data-slot="lnb"] [data-slot="lnb-profile-text"] p {
+  margin-top: 0;
+}
+/* Divider lines, same design as the Storybook Manager section divider (manager.css, .sidebar-subheading ::before): a 2px double
+   line (black 30% over white 40%) faded at both ends by a mask. Shared by the profile divider and the group divider below. */
+.hm-lnb-story [data-slot="lnb"] > [data-slot="lnb-profile"]::before,
+.hm-lnb-story .hm-lnb-story-group-divider {
+  height: 2px;
+  background: linear-gradient(var(--hm-lnb-text-stroke-color) 0 50%, color-mix(in srgb, var(--hm-sem-palette-white) 40%, transparent) 50% 100%);
+  mask-image: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent);
+  pointer-events: none;
+}
+/* Above the PC profile, 12px above the block. Like the Manager, it starts after the left inset (--hm-lnb-inset-start, 20px: where
+   the menu rows start) and stops 20px short of the right edge. The profile button is only as wide as its content, so the line is
+   sized from the column width (--hm-lnb-width) and offset back by the button's left margin. It sits in the 22px gap between the
+   menu and the profile, never over the avatar or text. The mobile Sheet profile is not under [data-slot="lnb"]. */
+.hm-lnb-story [data-slot="lnb"] > [data-slot="lnb-profile"] {
+  position: relative;
+}
+.hm-lnb-story [data-slot="lnb"] > [data-slot="lnb-profile"]::before {
+  content: "";
+  position: absolute;
+  top: -12px;
+  left: calc(var(--hm-lnb-inset-start) + 8px - var(--hm-lnb-profile-padding-x));
+  width: calc(var(--hm-lnb-width) - var(--hm-lnb-inset-start) - var(--hm-lnb-inset-end));
+}
+/* Between large menu groups (a role="separator" element, direct child of LNBNav). The package already puts a direct child at the
+   menu rows' x start (margin-left), so only the other margins are set: the line ends 20px short of the column's right edge (the
+   nav is 1px wider than the column), and 12px + 2px + 10px = 24px in total, the Manager's section gap. */
+.hm-lnb-story .hm-lnb-story-group-divider {
+  flex: none; /* keep the 2px in a height-limited (scrolling) menu, where an empty item would otherwise shrink to 0 */
+  margin-top: 12px;
+  margin-right: calc(var(--hm-lnb-inset-end) + 1px);
+  margin-bottom: 10px;
+}
+
+/* Profile in the mobile Sheet (<=1023px): 14px, 700, no text stroke. The Sheet is portaled to body, outside .hm-lnb-story, so the
+   Story marks its LNBProfile with a class instead. The doubled attribute raises specificity above the package's
+   [data-slot="lnb-profile"] strong/p rules. Menu links and the mobile header already have no text stroke. */
+.hm-lnb-story-mobile-profile[data-slot="lnb-profile"] [data-slot="lnb-profile-text"],
+.hm-lnb-story-mobile-profile[data-slot="lnb-profile"] strong {
+  font-size: 14px;
+}
+/* Description: 12px with no top margin, like the PC profile (the line height is unchanged, so the Sheet profile is 4px lower
+   without the old 4px margin: 8 + 20 + 20 + 8 = 56px). */
+.hm-lnb-story-mobile-profile[data-slot="lnb-profile"] p {
+  font-size: 12px;
+  margin-top: 0;
+}
+.hm-lnb-story-mobile-profile[data-slot="lnb-profile"] :is(strong, p) {
+  font-weight: 700;
+  -webkit-text-stroke: 0;
+  paint-order: normal;
+}
+
+/* depth1: nav items and top-level group triggers. The package hard-codes 14px vertical padding (28px line + 28px = 56px). */
+.hm-lnb-story [data-slot="lnb-item"],
+.hm-lnb-story [data-slot="lnb-group-trigger"] {
+  padding-top: 10px;
+  padding-bottom: 10px;
+}
+/* depth2: links directly inside a group and nested group triggers (28px line + 14px = 42px). */
+.hm-lnb-story [data-slot="lnb-group-content"] > [data-slot="lnb-item"],
+.hm-lnb-story [data-slot="lnb-group-content"] [data-slot="lnb-group-trigger"] {
+  min-height: 42px;
+  padding-top: 7px;
+  padding-bottom: 7px;
+}
+/* depth3: links in a nested group (24px line + 18px = 42px). --hm-lnb-third-min-height is also the Profile's height, so it is
+   overridden on the row's link instead of through the variable. */
+.hm-lnb-story [data-slot="lnb-group-content"] [data-slot="lnb-third-row"] > [data-slot="lnb-item"] {
+  min-height: 42px;
+  padding-top: 9px;
+  padding-bottom: 9px;
+}

src/patterns/lnb.stories.tsx

@@ -32,9 +32,11 @@ import {
 } from "@hm-design/ui"
 import { StateBoard } from "@/components/story-board"
 import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
+import "./lnb.stories.css"
 
-// LNB is a composition pattern. Layout visual reference is the ui-viz LNB (272px green column, 18/700 items, Beige current item joined
+// LNB is a composition pattern. Layout visual reference is the ui-viz LNB (the shared package default: 272px green column, 18/700 items,
-// to the content, Black 10% hover, Black 8% open group). The menu data and the current location are local sample data for this Story
+// Beige current item joined to the content, Black 10% hover, Black 8% open group). This Story overrides only the display values (240px column,
+// 212px min width, 14px items, 48/42px rows) in lnb.stories.css; the package defaults are unchanged. The menu data and the current location are local sample data for this Story
 // (no router). The content next to the column is a positioned surface with `--hm-lnb-join` rounded left corners: the LNB Mode page
 // owns it, here it only shows the connection. The column is desktop only (hidden below 1024px).
 
@@ -106,6 +108,12 @@ const contentStyle: CSSProperties = {
 type Child = { id: string; label: string }
 type LocalNode = { id: string; label: string; icon?: LucideIcon; children?: LocalNode[] }
 
+// Line between large menu groups (a top-level group and its neighbours). A direct child of LNBNav, so it follows the menu rows'
+// x start; the look is in lnb.stories.css (same line as the profile divider). Desktop column only: the mobile Sheet is unchanged.
+function GroupDivider() {
+  return <div role="separator" className="hm-lnb-story-group-divider" />
+}
+
 function Menu({
   initial = "overview",
   groupOpen = true,
@@ -116,6 +124,7 @@ function Menu({
   many,
   height,
   profile = true,
+  dividers = true,
 }: {
   initial?: string | null
   groupOpen?: boolean
@@ -128,6 +137,8 @@ function Menu({
   height?: number
   /** Story composition only: GNB + LNB gives profile ownership to the GNB. */
   profile?: boolean
+  /** Group divider lines around the menu group. `false` hides them (the profile divider above the profile stays). */
+  dividers?: boolean
 }) {
   const [current, setCurrent] = useState<string | null>(initial)
   const [open, setOpen] = useState(groupOpen)
@@ -162,6 +173,7 @@ function Menu({
             <LayoutGridIcon aria-hidden="true" />
             {longLabels ? "프로젝트 현황과 전체 일정을 한눈에 보는 개요" : "메뉴 1"}
           </LNBItem>
+          {dividers ? <GroupDivider /> : null}
           <LNBGroup label={longLabels ? "업무 관리와 진행 상황 점검" : "메뉴 2"} current={Boolean(current?.startsWith("tasks/"))} open={open} onOpenChange={setOpen}>
             {children.map((child) => (
               <LNBItem key={child.id} href={`#${child.id}`} active={current === child.id} onClick={go(child.id)}>
@@ -169,6 +181,7 @@ function Menu({
               </LNBItem>
             ))}
           </LNBGroup>
+          {dividers ? <GroupDivider /> : null}
           <LNBItem href="#reports" active={current === "reports"} onClick={go("reports")}>
             <ChartColumnIcon aria-hidden="true" />
             메뉴 3
@@ -262,6 +275,7 @@ function ThirdLevelMenu({
             <LayoutGridIcon aria-hidden="true" />
             대시보드
           </LNBItem>
+          <GroupDivider />
           <LNBGroup label="프로젝트 관리" current={onPath("projects")} open={open.projects} onOpenChange={(value) => setOpen((state) => ({ ...state, projects: value }))}>
             <LNBGroup label="디자인 관리" current={onPath("projects/design")} open={open.design} onOpenChange={(value) => setOpen((state) => ({ ...state, design: value }))}>
               {thirdLevelChildren(longLabels).map((child) => (
@@ -277,6 +291,7 @@ function ThirdLevelMenu({
               일정 관리
             </LNBItem>
           </LNBGroup>
+          <GroupDivider />
           <LNBItem href="#reports" active={current === "reports"} onClick={go("reports")}>
             <ChartColumnIcon aria-hidden="true" />
             현황 보고
@@ -361,6 +376,7 @@ function ResponsiveSpecimen({
   brand = "프로젝트 대시보드",
   longLabels,
   height,
+  dividers = true,
 }: {
   nodes: LocalNode[]
   initial: string | null
@@ -370,6 +386,8 @@ function ResponsiveSpecimen({
   brand?: string
   longLabels?: boolean
   height?: number
+  /** Group divider lines in the desktop menu, like `Menu`'s `dividers`. `false` hides them (the profile divider stays). */
+  dividers?: boolean
 }) {
   const [current, setCurrent] = useState<string | null>(initial)
   const [open, setOpen] = useState<Record<string, boolean>>(initialOpen)
@@ -380,25 +398,27 @@ function ResponsiveSpecimen({
   }
   const onPath = (id: string) => Boolean(current?.startsWith(`${id}/`))
   const isOpen = (id: string) => open[id] ?? true
-  const lnbMenu = (items: LocalNode[]): ReactNode =>
+  const lnbMenu = (items: LocalNode[], top = true): ReactNode =>
-    items.map((node) =>
+    items.map((node, index) => (
-      node.children ? (
+      <Fragment key={node.id}>
-        <LNBGroup
+        {dividers && top && index > 0 && (node.children || items[index - 1].children) ? <GroupDivider /> : null}
-          key={node.id}
+        {node.children ? (
-          label={node.label}
+          <LNBGroup
-          current={onPath(node.id)}
+            label={node.label}
-          open={isOpen(node.id)}
+            current={onPath(node.id)}
-          onOpenChange={(value) => setOpen((state) => ({ ...state, [node.id]: value }))}
+            open={isOpen(node.id)}
-        >
+            onOpenChange={(value) => setOpen((state) => ({ ...state, [node.id]: value }))}
-          {lnbMenu(node.children)}
+          >
-        </LNBGroup>
+            {lnbMenu(node.children, false)}
-      ) : (
+          </LNBGroup>
-        <LNBItem key={node.id} href={`#${node.id}`} active={current === node.id} onClick={go(node.id)}>
+        ) : (
-          {node.icon ? <node.icon aria-hidden="true" /> : null}
+          <LNBItem href={`#${node.id}`} active={current === node.id} onClick={go(node.id)}>
-          {node.label}
+            {node.icon ? <node.icon aria-hidden="true" /> : null}
-        </LNBItem>
+            {node.label}
-      )
+          </LNBItem>
-    )
+        )}
+      </Fragment>
+    ))
   const sheetMenu = (items: LocalNode[]): ReactNode =>
     items.map((node) =>
       node.children ? (
@@ -449,6 +469,7 @@ function ResponsiveSpecimen({
                   modal={false}
                   trigger={
                     <LNBProfile
+                      className="hm-lnb-story-mobile-profile"
                       name={profile.name}
                       description={profile.description}
                     >
@@ -500,7 +521,7 @@ const standaloneNav: LocalNode[] = [
   { id: "settings", label: "설정", icon: SettingsIcon },
 ]
 
-function Standalone({ mobileOpen = false, profileOpen = false }: { mobileOpen?: boolean; profileOpen?: boolean }) {
+function Standalone({ mobileOpen = false, profileOpen = false, dividers = true }: { mobileOpen?: boolean; profileOpen?: boolean; dividers?: boolean }) {
   const [current, setCurrent] = useState("projects/design/tokens")
   const [open, setOpen] = useState<Record<string, boolean>>({})
   const go = (id: string) => (event: MouseEvent) => {
@@ -508,25 +529,27 @@ function Standalone({ mobileOpen = false, profileOpen = false }: { mobileOpen?:
     setCurrent(id)
   }
   const onPath = (id: string) => current.startsWith(`${id}/`)
-  const lnbMenu = (nodes: LocalNode[]): ReactNode =>
+  const lnbMenu = (nodes: LocalNode[], top = true): ReactNode =>
-    nodes.map((node) =>
+    nodes.map((node, index) => (
-      node.children ? (
+      <Fragment key={node.id}>
-        <LNBGroup
+        {dividers && top && index > 0 && (node.children || nodes[index - 1].children) ? <GroupDivider /> : null}
-          key={node.id}
+        {node.children ? (
-          label={node.label}
+          <LNBGroup
-          current={onPath(node.id)}
+            label={node.label}
-          open={open[node.id] ?? true}
+            current={onPath(node.id)}
-          onOpenChange={(value) => setOpen((state) => ({ ...state, [node.id]: value }))}
+            open={open[node.id] ?? true}
-        >
+            onOpenChange={(value) => setOpen((state) => ({ ...state, [node.id]: value }))}
-          {lnbMenu(node.children)}
+          >
-        </LNBGroup>
+            {lnbMenu(node.children, false)}
-      ) : (
+          </LNBGroup>
-        <LNBItem key={node.id} href={`#${node.id}`} active={current === node.id} onClick={go(node.id)}>
+        ) : (
-          {node.icon ? <node.icon aria-hidden="true" /> : null}
+          <LNBItem href={`#${node.id}`} active={current === node.id} onClick={go(node.id)}>
-          {node.label}
+            {node.icon ? <node.icon aria-hidden="true" /> : null}
-        </LNBItem>
+            {node.label}
-      )
+          </LNBItem>
-    )
+        )}
+      </Fragment>
+    ))
   const sheetMenu = (nodes: LocalNode[]): ReactNode =>
     nodes.map((node) =>
       node.children ? (
@@ -567,6 +590,7 @@ function Standalone({ mobileOpen = false, profileOpen = false }: { mobileOpen?:
                   modal={false}
                   trigger={
                     <LNBProfile
+                      className="hm-lnb-story-mobile-profile"
                       name={profileData.name}
                       description={profileData.description}
                     >
@@ -598,7 +622,7 @@ const mobileViewport = {
 // Representative-board preview of a Story at a fixed viewport. The LNB/bar switch is a viewport media query, so the board embeds the
 // verification Story (the same `Standalone` composition) in an iframe of that width instead of rebuilding it in a narrow container.
 // Each iframe is its own document, so the closed Sheets do not share a portal or focus with the board.
-function ViewportPreview({ story, label, width, height }: { story: string; label: string; width: number; height: number }) {
+function ViewportPreview({ story, label, width, height, args }: { story: string; label: string; width: number; height: number; args?: string }) {
   return (
     <figure className="grid min-w-0 content-start gap-2">
       <figcaption className="text-sm text-muted-foreground">
@@ -607,7 +631,7 @@ function ViewportPreview({ story, label, width, height }: { story: string; label
       <div className="max-w-full overflow-x-auto">
         <iframe
           title={`${label} ${width}px`}
-          src={`iframe.html?id=patterns-layout-lnb--${story}&viewMode=story`}
+          src={`iframe.html?id=patterns-layout-lnb--${story}&viewMode=story${args ? `&args=${args}` : ""}`}
           width={width}
           height={height}
           className="box-content block border border-black/10"
@@ -617,7 +641,8 @@ function ViewportPreview({ story, label, width, height }: { story: string; label
   )
 }
 
-const meta = { title: "Patterns/Layout/LNB", component: LNB, parameters: { layout: "fullscreen", controls: { disable: true } } } satisfies Meta<typeof LNB>
+// `hm-lnb-story` (display: contents, see lnb.stories.css) scopes the 212px min width and 14px menu font to this Story only.
+const meta = { title: "Patterns/Layout/LNB", component: LNB, decorators: [(Story) => <div className="hm-lnb-story"><Story /></div>], parameters: { layout: "fullscreen", controls: { disable: true } } } satisfies Meta<typeof LNB>
 export default meta
 type Story = StoryObj<typeof meta>
 
@@ -632,8 +657,8 @@ export const All: Story = {
         <StateBoard
           min={560}
           states={[
-            { id: "selected", label: "Selected", children: <ResponsiveSpecimen nodes={simpleNav()} initial="overview" initialOpen={{ tasks: true }} /> },
+            { id: "selected", label: "Selected", children: <ResponsiveSpecimen nodes={simpleNav()} initial="overview" initialOpen={{ tasks: true }} dividers={false} /> },
-            { id: "third-selected", label: "3뎁스 · Selected", children: <ResponsiveSpecimen nodes={thirdLevelNav()} initial="projects/design/tokens" initialOpen={{ projects: true, "projects/design": true }} /> },
+            { id: "third-selected", label: "3뎁스 · Selected", children: <ResponsiveSpecimen nodes={thirdLevelNav()} initial="projects/design/tokens" initialOpen={{ projects: true, "projects/design": true }} dividers={false} /> },
           ]}
         />
       </StorySection>
@@ -641,12 +666,8 @@ export const All: Story = {
         <StateBoard
           min={560}
           states={[
-            { id: "default", label: "Default", children: <ResponsiveSpecimen nodes={simpleNav()} initial={null} initialOpen={{ tasks: false }} /> },
             { id: "expanded", label: "Expanded", children: <ResponsiveSpecimen nodes={simpleNav()} initial={null} initialOpen={{ tasks: true }} /> },
-            { id: "selected-child", label: "Selected Child", children: <ResponsiveSpecimen nodes={simpleNav()} initial="tasks/list" initialOpen={{ tasks: true }} /> },
+            { id: "states-third-selected", label: "3뎁스 · Selected", children: <ResponsiveSpecimen nodes={thirdLevelNav()} initial="projects/design/tokens" initialOpen={{ projects: true, "projects/design": true }} /> },
-            { id: "collapsed-with-selection", label: "Collapsed With Selection", children: <ResponsiveSpecimen nodes={simpleNav()} initial="tasks/list" initialOpen={{ tasks: false }} /> },
-            { id: "third-second-collapsed", label: "3뎁스 · 2뎁스 접힘", children: <ResponsiveSpecimen nodes={thirdLevelNav()} initial="projects/design/tokens" initialOpen={{ projects: true, "projects/design": false }} /> },
-            { id: "third-first-collapsed", label: "3뎁스 · 1뎁스 접힘", children: <ResponsiveSpecimen nodes={thirdLevelNav()} initial="projects/design/tokens" initialOpen={{ projects: false, "projects/design": true }} /> },
           ]}
         />
       </StorySection>
@@ -654,8 +675,8 @@ export const All: Story = {
         <StateBoard
           min={560}
           states={[
-            { id: "with-logo", label: "With Logo", children: <ResponsiveSpecimen nodes={simpleNav()} initial="overview" initialOpen={{ tasks: true }} logo={testLogo} /> },
+            { id: "with-logo", label: "With Logo", children: <ResponsiveSpecimen nodes={simpleNav()} initial="overview" initialOpen={{ tasks: true }} logo={testLogo} dividers={false} /> },
-            { id: "long", label: "Long Labels", children: <ResponsiveSpecimen nodes={simpleNav(true)} initial="tasks/list" initialOpen={{ tasks: true }} longLabels /> },
+            { id: "long", label: "Long Labels", children: <ResponsiveSpecimen nodes={simpleNav(true)} initial="tasks/list" initialOpen={{ tasks: true }} longLabels dividers={false} /> },
           ]}
         />
       </StorySection>
@@ -663,14 +684,14 @@ export const All: Story = {
         <StateBoard
           min={560}
           states={[
-            { id: "scroll", label: "Scroll", children: <ResponsiveSpecimen nodes={simpleNav(false, true)} initial="overview" initialOpen={{ tasks: true }} height={460} /> },
+            { id: "scroll", label: "Scroll", children: <ResponsiveSpecimen nodes={simpleNav(false, true)} initial="overview" initialOpen={{ tasks: true }} height={460} dividers={false} /> },
-            { id: "third-scroll", label: "3뎁스 · Scroll", children: <ResponsiveSpecimen nodes={thirdLevelNav(true, true)} initial="projects/design/layout" initialOpen={{ projects: true, "projects/design": true }} longLabels height={460} /> },
+            { id: "third-scroll", label: "3뎁스 · Scroll", children: <ResponsiveSpecimen nodes={thirdLevelNav(true, true)} initial="projects/design/layout" initialOpen={{ projects: true, "projects/design": true }} longLabels height={460} dividers={false} /> },
           ]}
         />
       </StorySection>
       <StorySection title="Usage · Standalone 반응형">
         <div className="flex flex-wrap items-start gap-6">
-          <ViewportPreview story="standalone-desktop" label="Desktop" width={1024} height={640} />
+          <ViewportPreview story="standalone-desktop" label="Desktop" width={1024} height={640} args="dividers:!false" />
           <ViewportPreview story="standalone-mobile" label="Mobile" width={390} height={640} />
         </div>
       </StorySection>
@@ -679,7 +700,7 @@ export const All: Story = {
 }
 
 export const Default: Story = { tags: ["verification"], render: () => <Menu initial={null} groupOpen={false} /> }
-export const Selected: Story = { tags: ["verification"], render: () => <Menu /> }
+export const Selected: Story = { tags: ["verification"], render: () => <Menu dividers={false} /> }
 export const Expanded: Story = { tags: ["verification"], render: () => <Menu initial={null} /> }
 export const SelectedChild: Story = { tags: ["verification"], name: "Selected Child", render: () => <Menu initial="tasks/list" /> }
 export const CollapsedWithSelection: Story = { tags: ["verification"], name: "Collapsed With Selection", render: () => <Menu initial="tasks/list" groupOpen={false} /> }
@@ -733,7 +754,14 @@ export const WithGNB: Story = {
 
 // LNB without a GNB, responsive. Desktop (>= 1024px): the column. Mobile (<= 1023px): the column is hidden and the connected-content
 // column becomes a full-width stack whose first row opens a Sheet with the same tree, selected item and every depth.
-export const StandaloneDesktop: Story = { tags: ["verification"], name: "LNB Standalone Desktop", render: () => <Standalone /> }
+// `dividers` is a Story arg (default true: the Story itself keeps its group dividers). The representative board's Desktop preview
+// opens this Story with `&args=dividers:!false` (see ViewportPreview) to show it without them.
+export const StandaloneDesktop: StoryObj<{ dividers: boolean }> = {
+  tags: ["verification"],
+  name: "LNB Standalone Desktop",
+  args: { dividers: true },
+  render: (args) => <Standalone dividers={args.dividers} />,
+}
 export const LNBProfileMenuOpen: Story = { tags: ["verification"], name: "LNB Profile Menu Open", render: () => <Standalone profileOpen /> }
 export const StandaloneMobile: Story = { tags: ["verification"], name: "LNB Standalone Mobile", ...mobileViewport, render: () => <Standalone /> }
 export const StandaloneMobileMenuOpen: Story = {