diff --git a/client/index.html b/client/index.html
index ab7c560cd..f9f05c932 100644
--- a/client/index.html
+++ b/client/index.html
@@ -11,7 +11,8 @@
 
 <body>
   <div id="root"></div>
+  <script type="module" src="/env.js"></script>
   <script type="module" src="/src/main.tsx"></script>
 </body>
 
-</html>
\ No newline at end of file
+</html>
diff --git a/client/nginx/conf.d/default.conf b/client/nginx/conf.d/default.conf
deleted file mode 100644
index c3f993a08..000000000
--- a/client/nginx/conf.d/default.conf
+++ /dev/null
@@ -1,34 +0,0 @@
-server {
-    listen 80 default_server;
-
-    server_name localhost;      # Set server name to localhost
-    server_tokens off;
-
-    location / {
-        root   /usr/share/nginx/html;
-        index  index.html index.htm;
-        try_files $uri $uri/ /index.html;
-    }
-    
-    # location /api/ {
-    #     proxy_pass http://server:52345/api/;
-    #     proxy_http_version 1.1;
-    #     proxy_set_header Host $host;
-    #     proxy_set_header X-Real-IP $remote_addr;
-    #     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-    #     proxy_set_header X-Forwarded-Proto $scheme;
-    #     proxy_set_header Connection '';
-    #     chunked_transfer_encoding off;
-    #     proxy_buffering off;
-    #     proxy_cache off;
-    # }
-
-    # location /api-docs/ {
-    #     proxy_pass http://server:52345/api-docs/;
-    #     proxy_http_version 1.1;
-    #     proxy_set_header Host $host;
-    #     proxy_set_header X-Real-IP $remote_addr;
-    #     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-    #     proxy_set_header X-Forwarded-Proto $scheme;
-    # }
-}
\ No newline at end of file
diff --git a/client/src/config/index.ts b/client/src/config/index.ts
index 9f0e106c4..7e497c0a7 100644
--- a/client/src/config/index.ts
+++ b/client/src/config/index.ts
@@ -1,5 +1,11 @@
 import type { DeploymentMode } from "@/types/env";
 
+declare global {
+  interface Window {
+    __ENV?: Record<string, unknown>;
+  }
+}
+
 export interface IEnvConfig {
   HOST: string;
   GLOBAL_REFRESH: number;
@@ -7,25 +13,35 @@ export interface IEnvConfig {
   DEPLOYMENT_MODE: DeploymentMode;
 }
 
-const rawRefresh = import.meta.env.VITE_APP_GLOBAL_REFRESH;
-const parsedRefresh = Number(rawRefresh);
-const GLOBAL_REFRESH = Number.isFinite(parsedRefresh) ? parsedRefresh : 60000;
+const RT = (typeof window !== "undefined" && window.__ENV) || undefined;
 
-const rawMode = import.meta.env.VITE_APP_DEPLOYMENT_MODE as
-  | DeploymentMode
-  | string
-  | undefined;
-const normalizedMode =
-  typeof rawMode === "string" ? (rawMode as string).trim().toLowerCase() : undefined;
-const DEPLOYMENT_MODE: DeploymentMode =
-  normalizedMode === "saas" || normalizedMode === "self_hosted"
-    ? (normalizedMode as DeploymentMode)
-    : "self_hosted";
+const requireKey = (key: string): string => {
+  if (!RT || !(key in RT)) {
+    throw new Error(`Missing runtime config: ${key}`);
+  }
+  const value = RT[key];
+  if (value == null || String(value).trim() === "") {
+    throw new Error(`Invalid runtime config: ${key}`);
+  }
+  return String(value);
+};
+
+const HOST = requireKey("APP_HOST");
+const API_BASE_URL = requireKey("APP_API_BASE_URL");
+const GLOBAL_REFRESH_STR = requireKey("GLOBAL_REFRESH");
+const GLOBAL_REFRESH_NUM = Number(GLOBAL_REFRESH_STR);
+if (!Number.isFinite(GLOBAL_REFRESH_NUM)) {
+  throw new Error(`GLOBAL_REFRESH must be a number, received: ${GLOBAL_REFRESH_STR}`);
+}
+const DEPLOYMENT_MODE_STR = requireKey("APP_DEPLOYMENT_MODE").toLowerCase();
+if (DEPLOYMENT_MODE_STR !== "saas" && DEPLOYMENT_MODE_STR !== "self_hosted") {
+  throw new Error(`APP_DEPLOYMENT_MODE must be 'saas' or 'self_hosted', received: ${DEPLOYMENT_MODE_STR}`);
+}
+const DEPLOYMENT_MODE = DEPLOYMENT_MODE_STR as DeploymentMode;
 
 export const config: IEnvConfig = {
-  HOST: import.meta.env.VITE_APP_HOST || "http://localhost:5173",
-  GLOBAL_REFRESH,
-  API_BASE_URL:
-    import.meta.env.VITE_APP_API_BASE_URL || "http://localhost:52345/api/v1",
+  HOST,
+  GLOBAL_REFRESH: GLOBAL_REFRESH_NUM,
+  API_BASE_URL,
   DEPLOYMENT_MODE,
 };
diff --git a/client/src/env.d.ts b/client/src/env.d.ts
index 717f8accd..402de40f5 100644
--- a/client/src/env.d.ts
+++ b/client/src/env.d.ts
@@ -1,12 +1,4 @@
 /// <reference types="vite/client" />
-import type { DeploymentMode } from "@/types/env";
-interface ImportMetaEnv {
-  readonly VITE_APP_HOST?: string;
-  readonly VITE_APP_GLOBAL_REFRESH?: string;
-  readonly VITE_APP_API_BASE_URL?: string;
-  readonly VITE_APP_DEPLOYMENT_MODE?: DeploymentMode;
-}
-
-interface ImportMeta {
-  readonly env: ImportMetaEnv;
-}
+// Runtime config now provided via window.__ENV; import.meta.env keys are not used.
+interface ImportMetaEnv {}
+interface ImportMeta { readonly env: ImportMetaEnv }
diff --git a/client/src/utils/ApiClient.ts b/client/src/utils/ApiClient.ts
index eca9554d6..25f612772 100644
--- a/client/src/utils/ApiClient.ts
+++ b/client/src/utils/ApiClient.ts
@@ -1,10 +1,11 @@
 import axios from "axios";
 import type { AxiosError } from "axios";
 import type { AxiosRequestConfig, AxiosResponse } from "axios";
-const BASE_URL = import.meta.env.VITE_APP_API_BASE_URL;
+import { config } from "@/config";
+const BASE_URL = config.API_BASE_URL;
 
 const api = axios.create({
-  baseURL: BASE_URL || "http://localhost:55555/api/v2",
+  baseURL: BASE_URL,
   withCredentials: true,
 });