diff --git a/.claude/rules/no-responsive.md b/.claude/rules/no-responsive.md
new file mode 100644
index 0000000..bef7133
--- /dev/null
+++ b/.claude/rules/no-responsive.md
@@ -0,0 +1,20 @@
+---
+paths:
+  - "src/**/*.ts"
+---
+
+# 렌더링 철학: 고정 레이아웃
+
+wireweave는 와이어프레임 DSL이다. 와이어프레임은 특정 화면 크기(width x height)를 기준으로 설계되며, 브라우저나 뷰포트 크기에 따라 레이아웃이 변하면 안 된다.
+
+## 핵심 원칙
+
+1. **페이지는 고정 크기다** — `page`에 지정된 width/height는 어떤 환경에서든 유지되어야 한다. 부모 컨테이너가 작아도 페이지 크기가 줄어들면 안 된다.
+
+2. **축소는 비율 유지로만** — 뷰포트가 페이지보다 작을 때는 `transform: scale()` 등으로 전체를 동일 비율로 축소하거나, 그대로 clipping한다. 내부 컴포넌트가 재배치되어서는 안 된다.
+
+3. **렌더링 결과는 환경에 독립적이다** — 에디터, Storybook, VSCode, 브라우저 어디서 열든 동일한 레이아웃이어야 한다. 각 환경이 scale/scroll을 처리하는 것은 허용하지만, 렌더러가 출력하는 HTML/CSS 자체가 환경에 따라 달라지면 안 된다.
+
+## 과거 사례
+
+`.wf-page`에 `flex-shrink: 0`이 없어서, body가 flex container인 환경에서 viewport < page width일 때 페이지가 자동 축소되고 내부 컴포넌트가 재배치되는 문제가 있었다. 렌더러의 CSS를 수정할 때 이 원칙이 깨지지 않는지 항상 확인할 것.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b533425..9392d04 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## [2.7.1-beta.0](https://github.com/wireweave/core/compare/v2.7.0...v2.7.1-beta.0) (2026-03-21)
+
+### Bug Fixes
+
+* **renderer:** prevent page shrinking in flex containers ([9d23737](https://github.com/wireweave/core/commit/9d2373786c57215bbfcfa67533ee47fe9d8298ff))
+
+### Documentation
+
+* **rules:** add fixed layout rendering philosophy ([96a503f](https://github.com/wireweave/core/commit/96a503f3154a7fcf68c1eefda2849bb6b0a534fa))
+
 ## [2.7.0](https://github.com/wireweave/core/compare/v2.7.0-beta.0...v2.7.0) (2026-03-17)
 
 ## [2.7.0-beta.0](https://github.com/wireweave/core/compare/v2.6.2...v2.7.0-beta.0) (2026-03-17)
diff --git a/__tests__/snapshots/__snapshots__/render.test.ts.snap b/__tests__/snapshots/__snapshots__/render.test.ts.snap
index 9daf1d8..a07913f 100644
--- a/__tests__/snapshots/__snapshots__/render.test.ts.snap
+++ b/__tests__/snapshots/__snapshots__/render.test.ts.snap
@@ -29,6 +29,7 @@ exports[`Render Snapshots > CSS Snapshots > should generate dark theme CSS 1`] =
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -1972,6 +1973,7 @@ exports[`Render Snapshots > CSS Snapshots > should generate light theme CSS 1`]
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -3992,6 +3994,7 @@ body {
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -5965,6 +5968,7 @@ body {
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -8060,6 +8064,7 @@ exports[`Render Snapshots > SVG Snapshots > should render buttons to SVG 1`] = `
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -10027,6 +10032,7 @@ exports[`Render Snapshots > SVG Snapshots > should render card to SVG 1`] = `
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -11995,6 +12001,7 @@ exports[`Render Snapshots > SVG Snapshots > should render form to SVG 1`] = `
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -13964,6 +13971,7 @@ exports[`Render Snapshots > SVG Snapshots > should render layout to SVG 1`] = `
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -15937,6 +15945,7 @@ exports[`Render Snapshots > SVG Snapshots > should render simple text to SVG 1`]
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
@@ -17902,6 +17911,7 @@ exports[`Render Snapshots > SVG Snapshots > should respect padding option 1`] =
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
diff --git a/package.json b/package.json
index fa17a2b..732665f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@wireweave/core",
-  "version": "2.7.0",
+  "version": "2.7.1-beta.0",
   "description": "Core parser and renderer for wireweave",
   "type": "module",
   "main": "dist/index.js",
diff --git a/src/renderer/styles.ts b/src/renderer/styles.ts
index dd63a72..687325c 100644
--- a/src/renderer/styles.ts
+++ b/src/renderer/styles.ts
@@ -66,6 +66,7 @@ function generateBaseStyles(prefix: string): string {
   position: relative;
   display: flex;
   flex-direction: column;
+  flex-shrink: 0;
   /* Wireframe boundary visualization */
   box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
   border-radius: 8px;