diff --git a/B07_DesignDetail/openwebcad/src/App.css b/B07_DesignDetail/openwebcad/src/App.css
index fadc2fdc..1091d467 100644
--- a/B07_DesignDetail/openwebcad/src/App.css
+++ b/B07_DesignDetail/openwebcad/src/App.css
@@ -149,6 +149,7 @@ body > canvas[data-id="canvas"] {
 	flex-direction: column;
 	background: var(--cad-chrome-raised);
 	border-bottom: 1px solid var(--cad-line);
+	transition: height 120ms ease;
 }
 .cad-ribbon-tabs {
 	display: flex;
@@ -157,6 +158,21 @@ body > canvas[data-id="canvas"] {
 	padding: 0 8px;
 	border-bottom: 1px solid var(--cad-line);
 }
+.cad-ribbon-tabs__collapse {
+	margin-left: auto;
+	width: 24px;
+	height: 20px;
+	align-self: center;
+	padding: 0;
+	border: 1px solid transparent;
+	border-radius: 4px;
+	background: transparent;
+	color: var(--cad-text-dim);
+	font-size: 11px;
+}
+.cad-ribbon-tabs__collapse:hover {
+	background: var(--cad-hover);
+}
 .cad-ribbon-tabs button {
 	padding: 0 14px;
 	border: 1px solid transparent;
diff --git a/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx b/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx
index c45c847c..f197d58e 100644
--- a/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx
+++ b/B07_DesignDetail/openwebcad/src/components/Toolbar.tsx
@@ -12,6 +12,7 @@ import { QuickAccessBar } from './QuickAccessBar';
 import { Ribbon } from '../ribbon/Ribbon';
 import { StatusBar } from './StatusBar';
 import { useCadRefresh } from './use-cad-refresh';
+import { isRibbonCollapsed } from './ui-state';
 import { getActiveToolActor } from '../state';
 import type { Tool } from '../tools';
 import { ViewControls } from './ViewControls';
@@ -22,6 +23,7 @@ export const Toolbar: FC = () => {
 	const [commandLineVisible, setCommandLineVisible] = useState(false);
 
 	const activeTool = (getActiveToolActor()?.getSnapshot()?.context?.type ?? null) as Tool | null;
+	const ribbonCollapsed = isRibbonCollapsed();
 
 	useEffect(() => {
 		// 편 상태의 폭은 App.css의 `--cad-panel-width` 기본값을 쓴다. 여기 숫자를 박아
@@ -32,8 +34,11 @@ export const Toolbar: FC = () => {
 			'--cad-command-height',
 			commandLineVisible ? '86px' : '0px'
 		);
+		// 리본 접힘 — 탭 줄(26px)만 남기고 패널 줄 자리를 걷는다(`Ribbon.tsx` 가 안 그림).
+		if (ribbonCollapsed) document.documentElement.style.setProperty('--cad-ribbon-height', '26px');
+		else document.documentElement.style.removeProperty('--cad-ribbon-height');
 		window.dispatchEvent(new Event('resize'));
-	}, [panelCollapsed, commandLineVisible]);
+	}, [panelCollapsed, commandLineVisible, ribbonCollapsed]);
 
 	return (
 		<>
diff --git a/B07_DesignDetail/openwebcad/src/components/ui-state.ts b/B07_DesignDetail/openwebcad/src/components/ui-state.ts
index b6a19552..868f1375 100644
--- a/B07_DesignDetail/openwebcad/src/components/ui-state.ts
+++ b/B07_DesignDetail/openwebcad/src/components/ui-state.ts
@@ -12,6 +12,8 @@ let inspectorCollapsed = false;
 let quickPropertiesVisible = false;
 let activeRibbonTab = 'home';
 let blockLibraryVisible = false;
+/** 호스트(M02)가 처음부터 접어 실을 때 true — 탭을 누르면 펼침(`setActiveRibbonTab`). */
+let ribbonCollapsed = false;
 
 const notify = () => notifyWindow(HtmlEvent.UPDATE_STATE);
 
@@ -20,12 +22,18 @@ export const isInspectorCollapsed = () => inspectorCollapsed;
 export const isQuickPropertiesVisible = () => quickPropertiesVisible;
 export const getActiveRibbonTab = () => activeRibbonTab;
 export const isBlockLibraryVisible = () => blockLibraryVisible;
+export const isRibbonCollapsed = () => ribbonCollapsed;
 
 export function setActiveRibbonTab(tabId: string): void {
 	activeRibbonTab = tabId;
 	notify();
 }
 
+export function setRibbonCollapsed(collapsed: boolean): void {
+	ribbonCollapsed = collapsed;
+	notify();
+}
+
 export function openInspector(tab: InspectorTab): void {
 	inspectorTab = tab;
 	inspectorCollapsed = false;
diff --git a/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts b/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts
index a29f203c..b42e3130 100644
--- a/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts
+++ b/B07_DesignDetail/openwebcad/src/integration/aislo-drawing-bridge.ts
@@ -25,6 +25,7 @@ import {
 	setHostTitle,
 	setLayers,
 } from '../state.ts';
+import { setRibbonCollapsed } from '../components/ui-state.ts';
 import { toast } from 'react-toastify';
 import { runCommandInput } from '../commands/run-command.ts';
 import { setRecoveryScope } from '../helpers/autosave.ts';
@@ -57,6 +58,8 @@ interface DrawingLoadMessage {
 	hostTitle?: string;
 	/** 저장(💾 · Ctrl+S)을 부모 [저장]에 맡기는가. */
 	hostSave?: boolean;
+	/** 리본을 접힌 채로 여는가 — 없으면(B07) 펼침 그대로. */
+	ribbonCollapsed?: boolean;
 }
 
 interface DrawingSaveRequestMessage {
@@ -207,6 +210,7 @@ export function registerAisloDrawingBridge() {
 			setHostReadOnly(event.data.readOnly === true);
 			setHostTitle(event.data.hostTitle ?? 'B07 상세 설계');
 			setHostSave(event.data.hostSave === true);
+			setRibbonCollapsed(event.data.ribbonCollapsed === true);
 			if (event.data.frameEdit) applyFramePreview();
 			// 앞 도면에서 켜 둔 그리기 도구를 내린다. 안 내리면 **확정한 도면 위에도**
 			// 그 도구가 계속 그린다 — 읽기 전용은 새 명령만 막기 때문이다(2026-09-01 실측:
diff --git a/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx b/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
index 57fe1f00..b46d3c77 100644
--- a/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
+++ b/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
@@ -3,7 +3,12 @@ import { type FC, type ReactNode, useEffect, useRef, useState } from 'react';
 import type { CadCommand } from '../commands/command.types';
 import { getCommandById } from '../commands/registry';
 import { runCommand } from '../commands/run-command';
-import { getActiveRibbonTab, setActiveRibbonTab } from '../components/ui-state';
+import {
+	getActiveRibbonTab,
+	isRibbonCollapsed,
+	setActiveRibbonTab,
+	setRibbonCollapsed,
+} from '../components/ui-state';
 import type { Tool } from '../tools';
 import { RIBBON_TABS, type RibbonPanel, type RibbonWidget } from './ribbon.config';
 
@@ -147,6 +152,7 @@ const Panel: FC<{
 export const Ribbon: FC<RibbonProps> = ({ activeTool, widgets, onCommandRun }) => {
 	const activeTabId = getActiveRibbonTab();
 	const activeTab = RIBBON_TABS.find((tab) => tab.id === activeTabId) ?? RIBBON_TABS[0];
+	const collapsed = isRibbonCollapsed();
 
 	const handleRun = (command: CadCommand) => {
 		runCommand(command);
@@ -161,23 +167,36 @@ export const Ribbon: FC<RibbonProps> = ({ activeTool, widgets, onCommandRun }) =
 						type="button"
 						key={tab.id}
 						data-active={tab.id === activeTab.id}
-						onClick={() => setActiveRibbonTab(tab.id)}
+						onClick={() => {
+							setActiveRibbonTab(tab.id);
+							if (collapsed) setRibbonCollapsed(false);
+						}}
 					>
 						{tab.label}
 					</button>
 				))}
+				<button
+					type="button"
+					className="cad-ribbon-tabs__collapse"
+					onClick={() => setRibbonCollapsed(!collapsed)}
+					title={collapsed ? '리본 펼치기' : '리본 접기'}
+				>
+					{collapsed ? '⌄' : '⌃'}
+				</button>
 			</div>
-			<div className="cad-ribbon-panels">
-				{activeTab.panels.map((panel) => (
-					<Panel
-						key={panel.label}
-						panel={panel}
-						activeTool={activeTool}
-						widgets={widgets}
-						onRun={handleRun}
-					/>
-				))}
-			</div>
+			{!collapsed && (
+				<div className="cad-ribbon-panels">
+					{activeTab.panels.map((panel) => (
+						<Panel
+							key={panel.label}
+							panel={panel}
+							activeTool={activeTool}
+							widgets={widgets}
+							onRun={handleRun}
+						/>
+					))}
+				</div>
+			)}
 		</nav>
 	);
 };
diff --git a/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts b/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts
index 63ae1738..6c0bec41 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_Drawing.ts
@@ -189,7 +189,13 @@ export function mountDrawingTemplate(
       null,
       !readOnly,
       {},
-      { recoveryScope, readOnly, hostTitle: "도면 양식 편집", hostSave: true },
+      {
+        recoveryScope,
+        readOnly,
+        hostTitle: "도면 양식 편집",
+        hostSave: true,
+        ribbonCollapsed: true,
+      },
     );
   };
 
diff --git a/ui_template/cad_host/cad_host.ts b/ui_template/cad_host/cad_host.ts
index 397138cd..d9c8a3c0 100644
--- a/ui_template/cad_host/cad_host.ts
+++ b/ui_template/cad_host/cad_host.ts
@@ -63,6 +63,8 @@ export interface CadLoadExtra {
   hostTitle?: string;
   /** 저장(💾 · Ctrl+S)을 부모 [저장]에 맡긴다 — 켜면 `onHostSave` 로 옴. */
   hostSave?: boolean;
+  /** 리본을 접힌 채로 연다 — 안 보내면 펼침 그대로. */
+  ribbonCollapsed?: boolean;
 }
 
 export interface CadHost<D extends CadHostDrawing, M, Q> {