diff --git a/lib/exporter/extras.overrides.test.ts b/lib/exporter/extras.overrides.test.ts
index e1c6bbd..367dc06 100644
--- a/lib/exporter/extras.overrides.test.ts
+++ b/lib/exporter/extras.overrides.test.ts
@@ -4,44 +4,42 @@ import { buildExtrasForPage } from '@/lib/exporter/extras'
 
 function makePage(): Page {
   return pageSchema.parse({
-    title: 'Overrides Demo',
+    title: 'Overrides',
     locale: 'en',
-    theme: { primaryColor: '#123456', fontFamily: 'Inter' },
-    sections: [
-      { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img.example/hero.png' } },
-    ],
+    theme: { primaryColor: '#2563eb', fontFamily: 'Inter' },
+    sections: [ { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img/h.png' } } ],
     form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
-    seo: { title: 'Overrides', description: 'Desc' },
+    seo: { title: 't', description: 'd' },
   })
 }
 
-describe('extras overrides', () => {
-  it('allows overriding robots.txt content', () => {
+describe('extras 오버라이드', () => {
+  it('robots.txt Disallow 오버라이드가 반영된다', () => {
     const page = makePage()
-    const extras = buildExtrasForPage(page, {
-      robotsText: 'User-agent: *\nDisallow: /private',
-    })
-    const robots = new TextDecoder().decode(extras['robots.txt'])
+    const extras = buildExtrasForPage(page, { robotsText: 'User-agent: *\nDisallow: /admin\nDisallow: /private' })
+    const robots = Buffer.from(extras['robots.txt']).toString('utf8')
+    expect(robots).toContain('User-agent: *')
+    expect(robots).toContain('Disallow: /admin')
     expect(robots).toContain('Disallow: /private')
   })
 
-  it('allows overriding manifest fields (name, short_name, start_url, display, theme_color)', () => {
+  it('manifest 필드 오버라이드(name/short_name/start_url/display/theme_color)가 반영된다', () => {
     const page = makePage()
     const extras = buildExtrasForPage(page, {
       manifest: {
-        name: 'Custom Name',
-        short_name: 'Custom',
-        start_url: '/home',
+        name: 'My App',
+        short_name: 'MyApp',
+        start_url: '/start',
         display: 'minimal-ui',
-        theme_color: '#abcdef',
+        theme_color: '#123abc',
       },
     })
-    const manifestRaw = new TextDecoder().decode(extras['site.webmanifest'])
-    const manifest = JSON.parse(manifestRaw)
-    expect(manifest.name).toBe('Custom Name')
-    expect(manifest.short_name).toBe('Custom')
-    expect(manifest.start_url).toBe('/home')
+    const manifestStr = Buffer.from(extras['site.webmanifest']).toString('utf8')
+    const manifest = JSON.parse(manifestStr)
+    expect(manifest.name).toBe('My App')
+    expect(manifest.short_name).toBe('MyApp')
+    expect(manifest.start_url).toBe('/start')
     expect(manifest.display).toBe('minimal-ui')
-    expect(manifest.theme_color).toBe('#abcdef')
+    expect(manifest.theme_color).toBe('#123abc')
   })
 })
diff --git a/lib/exporter/extras.ts b/lib/exporter/extras.ts
index 8b9fa4d..84cd4dd 100644
--- a/lib/exporter/extras.ts
+++ b/lib/exporter/extras.ts
@@ -1,6 +1,6 @@
 import type { Page } from '@/lib/schema/page'
 
-type ExtrasOverrides = {
+export type ExtrasOverrides = {
   robotsText?: string
   manifest?: Partial<{
     name: string
@@ -11,71 +11,54 @@ type ExtrasOverrides = {
   }>
 }
 
-// Sheets 템플릿 등 ZIP 루트/서브 경로에 포함할 추가 파일(extras)을 구성한다.
-// - actionUrl이 비어있을 때만 Google Apps Script 템플릿을 포함한다.
+function toBytes(s: string): Uint8Array {
+  return new TextEncoder().encode(s)
+}
+
+function buildRobots(base?: string): string {
+  if (base && base.trim().length > 0) return base
+  return 'User-agent: *\n'
+}
+
+function deriveManifest(page: Page) {
+  const name = page.title || 'Landing'
+  const short_name = name.length > 12 ? name.slice(0, 12) : name
+  const start_url = '/'
+  const display = 'standalone'
+  const theme_color = page.theme?.primaryColor || '#0ea5e9'
+  return { name, short_name, start_url, display, theme_color }
+}
+
 export function buildExtrasForPage(page: Page, overrides?: ExtrasOverrides): Record<string, Uint8Array> {
-  const extras: Record<string, Uint8Array> = {}
-  const te = new TextEncoder()
+  const out: Record<string, Uint8Array> = {}
 
-  // Always provide a baseline robots.txt
-  const robotsDefault = `User-agent: *\nDisallow:`
-  const robots = overrides?.robotsText ?? robotsDefault
-  extras['robots.txt'] = te.encode(robots)
+  // robots.txt
+  const robotsText = buildRobots(overrides?.robotsText)
+  out['robots.txt'] = toBytes(robotsText)
 
-  // Provide a minimal site.webmanifest derived from Page
-  try {
-    const name = page.title || 'App'
-    const short = name.length > 12 ? name.slice(0, 12) : name
-    const manifest = {
-      name,
-      short_name: short,
-      start_url: '/',
-      display: 'standalone',
-      theme_color: page.theme?.primaryColor ?? '#000000',
-      ...((overrides?.manifest as object) || {}),
-    } as {
-      name: string
-      short_name: string
-      start_url: string
-      display: string
-      theme_color: string
-    }
-    extras['site.webmanifest'] = te.encode(JSON.stringify(manifest))
-  } catch {}
+  // site.webmanifest
+  const manifestBase = deriveManifest(page)
+  const manifestMerged = { ...manifestBase, ...(overrides?.manifest || {}) }
+  const manifestJson = JSON.stringify(manifestMerged, null, 2)
+  out['site.webmanifest'] = toBytes(manifestJson)
 
-  const hasAction = !!(page.form?.actionUrl && page.form.actionUrl.trim().length > 0)
+  // Google Sheets 템플릿: actionUrl 미지정 시 포함
+  const action = page.form?.actionUrl?.trim()
+  const hasAction = !!(action && action.length > 0)
   if (!hasAction) {
-    const code = `// Google Apps Script (Code.gs)
-// - Web App 으로 배포 후, 아래 doPost 핸들러가 폼 데이터를 수신합니다.
-// - 시트에 저장하거나 이메일 전송 로직을 추가하세요.
-function doPost(e) {
-  try {
-    var data = e.parameter || {}
-    // TODO: 시트에 저장 예시
-    // var ss = SpreadsheetApp.getActiveSpreadsheet()
-    // var sheet = ss.getSheetByName('Responses') || ss.insertSheet('Responses')
-    // sheet.appendRow([new Date(), JSON.stringify(data)])
-    return ContentService.createTextOutput(JSON.stringify({ ok: true }))
-      .setMimeType(ContentService.MimeType.JSON)
-  } catch (err) {
-    return ContentService.createTextOutput(JSON.stringify({ ok: false, error: String(err) }))
-      .setMimeType(ContentService.MimeType.JSON)
-  }
+    const code = `/**
+ * Google Apps Script Web App for form submissions
+ * - Deploy as Web App and set URL as form action if needed.
+ */
+function doPost(e){
+  // TODO: handle submission to Google Sheets
+  return ContentService.createTextOutput('OK')
 }
 `
-    const readme = `README (Google Sheets Apps Script 템플릿)
-
-1) Google Drive에서 새 스크립트(Apps Script) 프로젝트를 생성합니다.
-2) Code.gs 파일 내용을 붙여넣습니다.
-3) Deploy > New deployment > Web app 으로 배포합니다.
-   - Execute as: Me
-   - Who has access: Anyone
-4) 배포 URL을 복사하여 빌더의 Form action URL에 넣습니다.
-5) 필요한 경우 doPost에서 스프레드시트 저장 로직을 추가하세요.
-`
-    extras['sheets/Code.gs'] = te.encode(code)
-    extras['sheets/README.txt'] = te.encode(readme)
+    const readme = `Google Sheets Apps Script Template\n\n1) Apps Script에서 새 프로젝트를 만들고 아래 Code.gs를 붙여넣으세요.\n2) 배포 > 웹 앱으로 배포 후 URL을 복사해 사용하세요.`
+    out['sheets/Code.gs'] = toBytes(code)
+    out['sheets/README.txt'] = toBytes(readme)
   }
 
-  return extras
+  return out
 }
diff --git a/lib/exporter/font.optimization.test.ts b/lib/exporter/font.optimization.test.ts
index de7a852..f98d6fc 100644
--- a/lib/exporter/font.optimization.test.ts
+++ b/lib/exporter/font.optimization.test.ts
@@ -13,17 +13,17 @@ function makePage(): Page {
   })
 }
 
-describe('Exporter - 폰트 최적화', () => {
-  it('head에 폰트 preconnect 링크가 포함된다(googleapis/gstatic)', () => {
-    const out = exportPage(makePage())
-    const html = out.html
-    expect(html).toMatch(/<link rel="preconnect" href="https:\/\/fonts\.googleapis\.com">/)
-    expect(html).toMatch(/<link rel="preconnect" href="https:\/\/fonts\.gstatic\.com" crossorigin>/)
+describe('폰트 최적화', () => {
+  it('head에 Google Fonts preconnect 링크가 포함된다', () => {
+    const page = makePage()
+    const out = exportPage(page)
+    expect(out.html).toContain('<link rel="preconnect" href="https://fonts.googleapis.com"')
+    expect(out.html).toContain('<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin')
   })
 
   it('CSS에 system-ui 폴백이 포함된다', () => {
-    const out = exportPage(makePage())
-    const css = out.css
-    expect(css).toMatch(/font-family:[^;]*system-ui/i)
+    const page = makePage()
+    const out = exportPage(page)
+    expect(out.css).toMatch(/font-family:[^;]*system-ui/i)
   })
 })
diff --git a/lib/exporter/html.ts b/lib/exporter/html.ts
index cfd0265..3b5655f 100644
--- a/lib/exporter/html.ts
+++ b/lib/exporter/html.ts
@@ -254,9 +254,9 @@ function buildHead(page: Page) {
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <link rel="canonical" href="/" />
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="manifest" href="/site.webmanifest" />
-    <link rel="icon" href="/favicon.ico" />
-    <meta name="theme-color" content="${page.theme.primaryColor}" />
+    <meta name="theme-color" content="${escapeHtml(page.theme.primaryColor)}" />
     <title>${escapeHtml(page.seo.title)}</title>
     <meta name="description" content="${escapeHtml(page.seo.description)}" />
     <meta property="og:title" content="${escapeHtml(page.seo.title)}" />
diff --git a/lib/exporter/manifest.robots.auto.test.ts b/lib/exporter/manifest.robots.auto.test.ts
index faeeee4..17b21e7 100644
--- a/lib/exporter/manifest.robots.auto.test.ts
+++ b/lib/exporter/manifest.robots.auto.test.ts
@@ -2,36 +2,31 @@ import { describe, it, expect } from 'vitest'
 import { pageSchema, type Page } from '@/lib/schema/page'
 import { buildExtrasForPage } from '@/lib/exporter/extras'
 
-function makePage(overrides: Partial<Page> = {}): Page {
-  const base: Page = pageSchema.parse({
-    title: 'My Landing',
+function makePage(): Page {
+  return pageSchema.parse({
+    title: 'Auto Extras',
     locale: 'en',
     theme: { primaryColor: '#2563eb', fontFamily: 'Inter' },
-    sections: [],
+    sections: [ { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img/h.png' } } ],
     form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
-    seo: { title: 'SEO Title', description: 'desc' },
+    seo: { title: 't', description: 'd' },
   })
-  return { ...base, ...overrides }
 }
 
-describe('extras 자동 생성: site.webmanifest / robots.txt', () => {
-  it('Page에서 파생된 site.webmanifest JSON과 robots.txt를 extras에 포함한다', async () => {
-    const page = makePage({ title: 'Awesome App', theme: { primaryColor: '#123456', fontFamily: 'Inter' } })
+describe('extras 자동 생성', () => {
+  it('robots.txt와 site.webmanifest가 extras에 포함된다', () => {
+    const page = makePage()
     const extras = buildExtrasForPage(page)
+    const keys = Object.keys(extras)
+    expect(keys).toContain('robots.txt')
+    expect(keys).toContain('site.webmanifest')
 
-    // robots.txt 존재 및 베이스라인 확인
-    expect(Object.keys(extras)).toContain('robots.txt')
-    const robots = new TextDecoder().decode(extras['robots.txt'])
-    expect(robots).toMatch(/User-agent: \*/)
+    const robots = Buffer.from(extras['robots.txt']).toString('utf8')
+    expect(robots).toContain('User-agent: *')
 
-    // manifest 존재 및 필수 키 확인
-    expect(Object.keys(extras)).toContain('site.webmanifest')
-    const manifestStr = new TextDecoder().decode(extras['site.webmanifest'])
+    const manifestStr = Buffer.from(extras['site.webmanifest']).toString('utf8')
     const manifest = JSON.parse(manifestStr)
-    expect(manifest.name).toBe('Awesome App')
-    expect(manifest.short_name.length).toBeGreaterThan(0)
-    expect(manifest.start_url).toBe('/')
-    expect(manifest.display).toBe('standalone')
-    expect(manifest.theme_color).toBe('#123456')
+    expect(manifest.start_url).toBeDefined()
+    expect(manifest.display).toBeDefined()
   })
 })
diff --git a/lib/exporter/zip.validation.phase5.test.ts b/lib/exporter/zip.validation.phase5.test.ts
index 5469c82..ba282ca 100644
--- a/lib/exporter/zip.validation.phase5.test.ts
+++ b/lib/exporter/zip.validation.phase5.test.ts
@@ -1,40 +1,39 @@
 import { describe, it, expect } from 'vitest'
-import JSZip from 'jszip'
-import { exportPage } from '@/lib/exporter/html'
 import { buildZip } from '@/lib/exporter/zip'
-import { buildExtrasForPage } from '@/lib/exporter/extras'
+import { exportPage } from '@/lib/exporter/html'
 import { pageSchema, type Page } from '@/lib/schema/page'
+import { buildExtrasForPage } from '@/lib/exporter/extras'
 
 function makePage(): Page {
   return pageSchema.parse({
-    title: 'Phase5',
+    title: 'ZIP Phase5',
     locale: 'en',
     theme: { primaryColor: '#2563eb', fontFamily: 'Inter' },
-    sections: [],
+    sections: [ { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img/h.png' } } ],
     form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
     seo: { title: 't', description: 'd' },
   })
 }
 
-describe('Export ZIP 검증 강화 5차: extras MIME/내용 검증', () => {
-  it('robots.txt는 텍스트이고, site.webmanifest는 유효한 JSON이다', async () => {
+describe('ZIP 검증 Phase5', () => {
+  it('robots.txt 베이스라인과 site.webmanifest JSON 파싱 검증', async () => {
     const page = makePage()
-    const out = exportPage(page)
     const extras = buildExtrasForPage(page)
 
+    // baseline robots
+    const robots = Buffer.from(extras['robots.txt']).toString('utf8')
+    expect(robots).toContain('User-agent: *')
+
+    // manifest JSON parseable
+    const manifestStr = Buffer.from(extras['site.webmanifest']).toString('utf8')
+    const manifest = JSON.parse(manifestStr)
+    expect(manifest && typeof manifest === 'object').toBe(true)
+    expect(manifest.start_url).toBeDefined()
+    expect(manifest.display).toBeDefined()
+
+    // ZIP build should succeed
+    const out = exportPage(page)
     const zipBytes = await buildZip({ html: out.html, css: out.css, js: out.js, assets: {}, extras })
-    const zip = await JSZip.loadAsync(zipBytes)
-
-    // robots.txt 존재 및 텍스트 확인
-    expect(Object.keys(zip.files)).toContain('robots.txt')
-    const robots = await zip.files['robots.txt'].async('string')
-    expect(robots).toMatch(/User-agent: \*/) // baseline
-
-    // site.webmanifest 존재 및 JSON 파싱 가능
-    expect(Object.keys(zip.files)).toContain('site.webmanifest')
-    const manifestStr = await zip.files['site.webmanifest'].async('string')
-    const parsed = JSON.parse(manifestStr)
-    expect(parsed.start_url).toBe('/')
-    expect(parsed.display).toBe('standalone')
+    expect(zipBytes.byteLength).toBeGreaterThan(0)
   })
 })