diff --git a/dat-gateway/src/main/resources/static/catalog.html b/dat-gateway/src/main/resources/static/catalog.html
index 4324ef2e..977d04ef 100644
--- a/dat-gateway/src/main/resources/static/catalog.html
+++ b/dat-gateway/src/main/resources/static/catalog.html
@@ -1,12 +1,15 @@
-﻿<!DOCTYPE html>
+<!DOCTYPE html>
 <html lang="ko">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>AI Tool Catalog</title>
-    <script src="https://cdn.tailwindcss.com"></script>
-    <link href="https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@400;500;600&display=swap" rel="stylesheet">
+    <title>Tool Catalog</title>
+    <script src="/lib/tailwindcss.js"></script>
     <style>
+        :root {
+            --font-sans: 'Geist Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+            --font-mono: 'Geist Mono', SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+        }
         * { font-family: 'Geist', sans-serif; }
         body { background-color: #09090b; color: #f4f4f5; }
         .geist-mono { font-family: 'Geist Mono', monospace; }
diff --git a/dat-gateway/src/main/resources/static/chat.html b/dat-gateway/src/main/resources/static/chat.html
index a1bf4516..a3e97429 100644
--- a/dat-gateway/src/main/resources/static/chat.html
+++ b/dat-gateway/src/main/resources/static/chat.html
@@ -4,11 +4,13 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>AX HUB - ChatClient</title>
-    <script src="https://unpkg.com/@tailwindcss/browser@4"></script>
+    <script src="/lib/tailwindcss.js"></script>
     <script src="/vendor/marked.umd.js"></script>
-    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap" rel="stylesheet">
     <style>
-        body { font-family: 'Inter', sans-serif; background-color: #0f1115; color: #e2e8f0; }
+        :root {
+            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+        }
+        body { font-family: var(--font-sans); background-color: #0f1115; color: #e2e8f0; }
         .scrollbar-hide::-webkit-scrollbar { display: none; }
         .scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }
         
diff --git a/dat-gateway/src/main/resources/static/index.html b/dat-gateway/src/main/resources/static/index.html
index 4524d3cd..31b2b53a 100644
--- a/dat-gateway/src/main/resources/static/index.html
+++ b/dat-gateway/src/main/resources/static/index.html
@@ -1,19 +1,25 @@
-﻿<!DOCTYPE html>
+<!DOCTYPE html>
 <html lang="ko" class="dark">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>AXHUB Gateway</title>
-    <script src="https://cdn.tailwindcss.com"></script>
-    <link href="https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@400;500;600&display=swap" rel="stylesheet">
+    <title>AX HUB - MCP API Gateway</title>
+    <!-- 폐쇄망을 위한 로컬 스크립트 및 시스템 폰트 대체 -->
+    <script src="/lib/tailwindcss.js"></script>
+    <style>
+        :root {
+            --font-sans: 'Geist Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+            --font-mono: 'Geist Mono', SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+        }
+    </style>
     <script>
         tailwind.config = {
             darkMode: 'class',
             theme: {
                 extend: {
                     fontFamily: {
-                        sans: ['Geist', 'sans-serif'],
-                        mono: ['Geist Mono', 'monospace']
+                        sans: ['var(--font-sans)'],
+                        mono: ['var(--font-mono)']
                     },
                     colors: {
                         background: '#09090b', /* zinc-950 */
diff --git a/dat-gateway/src/main/resources/static/playground.html b/dat-gateway/src/main/resources/static/playground.html
index 7f51574a..3e5217bf 100644
--- a/dat-gateway/src/main/resources/static/playground.html
+++ b/dat-gateway/src/main/resources/static/playground.html
@@ -1,15 +1,18 @@
-﻿<!DOCTYPE html>
+<!DOCTYPE html>
 <html lang="ko">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Tool Playground</title>
-    <script src="https://cdn.tailwindcss.com"></script>
-    <link href="https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@400;500;600&display=swap" rel="stylesheet">
+    <script src="/lib/tailwindcss.js"></script>
     <style>
-        * { font-family: 'Geist', sans-serif; }
+        :root {
+            --font-sans: 'Geist Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+            --font-mono: 'Geist Mono', SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+        }
+        * { font-family: var(--font-sans); }
         body { background-color: #09090b; color: #f4f4f5; }
-        .geist-mono { font-family: 'Geist Mono', monospace; }
+        .geist-mono { font-family: var(--font-mono); }
 
         .input-field {
             width: 100%;
diff --git a/dat-gateway/src/main/resources/static/static/index.html b/dat-gateway/src/main/resources/static/static/index.html
index 549ddadd..f56b1479 100644
--- a/dat-gateway/src/main/resources/static/static/index.html
+++ b/dat-gateway/src/main/resources/static/static/index.html
@@ -1,11 +1,16 @@
-﻿<!DOCTYPE html>
+<!DOCTYPE html>
 <html lang="ko" class="dark">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Shinhan AI MCP Gateway</title>
-    <script src="https://cdn.tailwindcss.com"></script>
-    <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Pretendard:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap" rel="stylesheet">
+    <title>AX HUB - Local Registry</title>
+    <script src="/lib/tailwindcss.js"></script>
+    <style>
+        :root {
+            --font-sans: 'Geist Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+            --font-mono: 'Geist Mono', SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+        }
+    </style>
     <script>
         tailwind.config = {
             darkMode: 'class',
