diff --git a/layers/components/layouts/Header.vue b/layers/components/layouts/Header.vue
index 3b5350f..8cc9c7c 100644
--- a/layers/components/layouts/Header.vue
+++ b/layers/components/layouts/Header.vue
@@ -1,5 +1,4 @@
 <script setup lang="ts">
-import { onClickOutside, useWindowSize } from '@vueuse/core'
 import { useGameDataStore } from '#layers/stores/useGameDataStore'
 import type {
   GameDataMenu,
@@ -9,6 +8,9 @@ import type {
   PlatformTransformType,
 } from '#layers/types/api/gameData'
 
+const MORE_WIDTH = 72
+const START_WIDTH_MARGIN = 40
+
 const route = useRoute()
 const { tm } = useI18n()
 const { width } = useWindowSize()
@@ -21,21 +23,22 @@ const modalStore = useModalStore()
 const { gameData } = storeToRefs(gameDataStore)
 const { isPassedStoveGnb } = storeToRefs(scrollStore)
 
-const navAreaRef = ref<HTMLElement>()
-const startRef = ref<HTMLElement>()
+const navAreaRef = ref<HTMLElement | null>(null)
+const startRef = ref<HTMLElement | null>(null)
 
-const gnbData = gameData.value?.gnb
 const isMenuOpen = ref(false)
 const navWidth = ref(0)
-const startWidth = ref(0)
 const officialItemWidths = ref<number[]>([])
 const overflowNam = ref<number>(0)
+// const { width: navWidth } = useElementSize(navAreaRef)
+const { width: startWidth } = useElementSize(startRef)
 
+const gnbData = computed(() => gameData.value?.gnb)
 const gnb1depthButtonData = computed(
-  () => gnbData?.buttons[0]?.button_json as GameDataResourceGroup
+  () => gnbData.value?.buttons[0]?.button_json as GameDataResourceGroup
 )
 const gnb2depthButtonData = computed(
-  () => gnbData?.buttons[1]?.button_json as GameDataResourceGroupSet
+  () => gnbData.value?.buttons[1]?.button_json as GameDataResourceGroupSet
 )
 const currentPath = computed(() => formatPathWithoutLocale(route.path))
 const supportedPlatforms = computed(
@@ -72,20 +75,10 @@ const isNavItemActive = (gnbItem: GameDataMenu): boolean => {
 
 // navAreaRef의 넓이를 구하는 함수
 const calculateNavWidth = () => {
-  if (!navAreaRef.value || !gnbData) return 0
+  if (!navAreaRef.value || !gnbData.value) return 0
 
   const navAreaWidth = navAreaRef.value.offsetWidth
-  const moreWidth = 72 // 더보기 버튼 넓이 + 마진
-  return navAreaWidth + moreWidth
-}
-
-// startRef의 넓이를 구하는 함수
-const calculateStartWidth = () => {
-  if (!startRef.value || !gnbData) return 0
-
-  const startWidth = startRef.value.offsetWidth
-  const headerRightPadding = 40 // 헤더 오른쪽 마진
-  return startWidth + headerRightPadding
+  navWidth.value = navAreaWidth + MORE_WIDTH
 }
 
 // official 자식들의 넓이를 구하는 함수
@@ -104,24 +97,20 @@ const calculateOfficialItemWidths = () => {
   }
 
   officialItemWidths.value = widths
-
-  // 해상도 체크 및 오버플로우 계산
-  calculateOverflow()
 }
 
 // 오버플로우 계산 함수
 const calculateOverflow = () => {
   if (!navAreaRef.value || !startRef.value) return
 
-  const totalNavWidth = navWidth.value + startWidth.value
-  const screenWidth = width.value
-
-  // 모바일(1024px 미만)에서는 overflowNam을 0으로 설정
-  if (screenWidth < 1024) {
+  if (breakpoints.value.isMobile) {
     overflowNam.value = 0
     return
   }
 
+  const screenWidth = width.value
+  const totalNavWidth = navWidth.value + startWidth.value + START_WIDTH_MARGIN
+
   // 해상도가 navWidth + startWidth보다 작은 경우
   if (screenWidth < totalNavWidth) {
     let removedCount = 0
@@ -211,7 +200,10 @@ const handleStartClick = () => {
   window.open(url, '_blank')
 }
 
-const stopClickOutside = onClickOutside(navAreaRef, () => handleMenuClose())
+watchEffect(() => {
+  if (!startWidth.value) return // 0, null, undefined면 스킵
+  calculateOverflow()
+})
 
 // 화면 크기 변경 시 오버플로우 재계산
 watch(width, () => {
@@ -221,20 +213,13 @@ watch(width, () => {
 onMounted(() => {
   overflowNam.value = 0
 
+  // 초기 계산 시도
   nextTick(() => {
-    if (navAreaRef.value && startRef.value) {
-      navWidth.value = calculateNavWidth()
-      startWidth.value = calculateStartWidth()
-      calculateOfficialItemWidths()
-    }
+    calculateNavWidth()
+    calculateOfficialItemWidths()
+    calculateOverflow()
   })
 })
-
-onBeforeUnmount(() => {
-  if (stopClickOutside) {
-    stopClickOutside()
-  }
-})
 </script>
 
 <template>
@@ -252,8 +237,11 @@ onBeforeUnmount(() => {
         <AtomsIconsMenuBoldLine class="mx-auto" />
         <span class="sr-only">menu open</span>
       </button>
-      <div :class="['nav-wrap', { 'is-open': isMenuOpen }]">
-        <div ref="navAreaRef" class="nav-area">
+      <div
+        :class="['nav-wrap', { 'is-open': isMenuOpen }]"
+        @click="handleMenuClose"
+      >
+        <div ref="navAreaRef" class="nav-area" @click.stop>
           <div class="nav-logo">
             <AtomsLocaleLink to="/brand" @click="handleMenuClose">
               <img
@@ -378,39 +366,42 @@ onBeforeUnmount(() => {
               </div>
             </div>
           </nav>
-          <div ref="startRef" class="btn-start">
-            <ClientOnly>
-              <component
-                :is="
-                  breakpoints.isDesktop ? 'BlocksButtonLauncher' : 'AtomsButton'
-                "
-                type="custom"
-                platform="pc"
-                :background-color="
-                  getColorCodeFromData(gnb1depthButtonData?.btn_info, 'btn')
-                "
-                :text-color="
-                  getColorCodeFromData(gnb1depthButtonData?.btn_info, 'txt')
-                "
-                @click="handleStartClick"
-              >
-                {{ gnb1depthButtonData?.btn_info?.txt_btn_name }}
-              </component>
-
-              <div
-                v-if="breakpoints.isDesktop && gnb2depthButtonData"
-                class="nav-2depth"
-              >
-                <ul>
-                  <li v-for="(item, key) in gnb2depthButtonData" :key="key">
-                    <BlocksButtonLauncher type="custom" :platform="key">
-                      {{ item.btn_info?.txt_btn_name }}
-                    </BlocksButtonLauncher>
-                  </li>
-                </ul>
-              </div>
-            </ClientOnly>
-          </div>
+          <ClientOnly>
+            <div ref="startRef" class="btn-start">
+              <template v-if="gnb1depthButtonData">
+                <component
+                  :is="
+                    breakpoints.isDesktop
+                      ? 'BlocksButtonLauncher'
+                      : 'AtomsButton'
+                  "
+                  type="custom"
+                  platform="pc"
+                  :background-color="
+                    getColorCodeFromData(gnb1depthButtonData?.btn_info, 'btn')
+                  "
+                  :text-color="
+                    getColorCodeFromData(gnb1depthButtonData?.btn_info, 'txt')
+                  "
+                  @click="handleStartClick"
+                >
+                  {{ gnb1depthButtonData?.btn_info?.txt_btn_name }}
+                </component>
+                <div
+                  v-if="breakpoints.isDesktop && gnb2depthButtonData"
+                  class="nav-2depth"
+                >
+                  <ul>
+                    <li v-for="(item, key) in gnb2depthButtonData" :key="key">
+                      <BlocksButtonLauncher type="custom" :platform="key">
+                        {{ item.btn_info?.txt_btn_name }}
+                      </BlocksButtonLauncher>
+                    </li>
+                  </ul>
+                </div>
+              </template>
+            </div>
+          </ClientOnly>
           <button class="btn-close" @click="handleMenuClose">
             <AtomsIconsCloseLine
               size="24"
diff --git a/layers/server/middleware/gameData.ts b/layers/server/middleware/gameData.ts
index 691727d..415956a 100644
--- a/layers/server/middleware/gameData.ts
+++ b/layers/server/middleware/gameData.ts
@@ -67,7 +67,11 @@ const cache = new LRUCache({
  * @param finalLocale - 최종 언어
  * @param baseDomain - 기본 도메인
  */
-function setFinalLocaleCookie(event: any, finalLocale: string, baseDomain: string) {
+function setFinalLocaleCookie(
+  event: any,
+  finalLocale: string,
+  baseDomain: string
+) {
   setCookie(event, 'LOCALE', finalLocale.toLowerCase(), {
     domain: baseDomain,
     path: '/',
@@ -95,7 +99,6 @@ function fnLocaleMiddleware(event: any, finalLocale: string) {
     // 쿼리스트링 포함 시 순수 경로만 추출
     arrPath = path.split('?')[0].split('/')
     queryString = path.split('?')[1]
-    
   } else {
     arrPath = path.split('/')
     queryString = ''
@@ -134,7 +137,7 @@ export default defineEventHandler(async event => {
   if (event.node.res.headersSent || event.node.res.writableEnded) {
     return
   }
-  
+
   // const runType = `${config.public.runType}`
   // console.log("🚀 ~ baseDomain:", config.public.baseDomain)
   // const url = getRequestURL(event)
@@ -235,9 +238,14 @@ export default defineEventHandler(async event => {
     if (event.node.res.headersSent || event.node.res.writableEnded) {
       return
     }
-    
-      // 2. 언어 코드 추출
-    finalLocale = ssrGetFinalLocale(event?.node.req.url, event.node.req.headers, initLangCodes, initDefaultLocale)
+
+    // 2. 언어 코드 추출
+    finalLocale = ssrGetFinalLocale(
+      event?.node.req.url,
+      event.node.req.headers,
+      initLangCodes,
+      initDefaultLocale
+    )
 
     const path = event?.node.req.url || ''
     let queryStringF = ''
@@ -255,17 +263,17 @@ export default defineEventHandler(async event => {
         console.error('쿼리스트링 파싱 에러:', e)
       }
     }
-    
+
     // 테스트용 500 에러 발생
     if (test500) {
       throw new Error('테스트용 500 에러 발생')
     }
-    
+
     // 미리보기 API 호출 처리
     if (fValue === 'preview') {
       cleanHost = 'samplegame.onstove.com'
     }
-      
+
     const queryParams: Record<string, string> = {
       game_domain: cleanHost || '',
       lang_code: finalLocale,
@@ -283,7 +291,7 @@ export default defineEventHandler(async event => {
       event.context.gameData = response.value
       event.context.googleAnalyticsId = response.value?.ga_code
 
-      // console.log('🚀 ~ gameData:', response.value)
+      console.log('🚀 ~ gameData:', response.value)
 
       // 점검 데이터 조회
       let inspectionData
@@ -305,7 +313,6 @@ export default defineEventHandler(async event => {
           )
           inspectionData = inspectionResponse?.value?.inspection
           cache.set(cacheKey, inspectionData) // 캐시에 저장
-          // console.log("🚀 ~ inspectionData:", inspectionData)
         }
       }
 
@@ -346,7 +353,10 @@ export default defineEventHandler(async event => {
             // 허용된 IP 목록 확인
             if (!inspectionData?.ip_filter_list?.includes(clientIP)) {
               // 허용되지 않은 IP인 경우 점검 페이지로 이동
-              if (!event.node.res.headersSent && !event.node.res.writableEnded) {
+              if (
+                !event.node.res.headersSent &&
+                !event.node.res.writableEnded
+              ) {
                 event.node.res.statusCode = 302
                 event.node.res.setHeader('Location', inspectionPath)
                 event.node.res.end()
@@ -412,7 +422,7 @@ export default defineEventHandler(async event => {
     }
   } catch (error) {
     console.error('gameData load error:', error)
-    
+
     // 500 에러 발생 시 /error 페이지로 리다이렉트
     if (!event.node.res.headersSent && !event.node.res.writableEnded) {
       // 언어 코드 추출 시도
@@ -429,7 +439,7 @@ export default defineEventHandler(async event => {
       }
       // finalLocale이 undefined인 경우 기본값으로 'ko' 설정
 
-      console.log("🚀 ~ 여기도 타? error:", error)
+      console.log('🚀 ~ 여기도 타? error:', error)
       throw createError({
         statusCode: error.statusCode,
         statusMessage: error.statusMessage,