diff --git a/lib/env-entry.ts b/lib/env-entry.ts
index d8bb5a9..3e4daf9 100644
--- a/lib/env-entry.ts
+++ b/lib/env-entry.ts
@@ -1,8 +1,10 @@
-import { env } from "next-runtime-env"
+import { getClientEnv, getServerEnv } from "./env"
+import type { EnvKey } from "./env"
 
-export default function getEnv(key: string) {
+export default function getEnv(key: EnvKey): string {
   if (key.startsWith("NEXT_PUBLIC_")) {
-    return env(key)
+    const clientKey = key.replace("NEXT_PUBLIC_", "") as any
+    return getClientEnv(clientKey)
   }
-  return process.env[key]
+  return getServerEnv(key as any)
 }
diff --git a/lib/env.ts b/lib/env.ts
new file mode 100644
index 0000000..0caa5fd
--- /dev/null
+++ b/lib/env.ts
@@ -0,0 +1,142 @@
+import { env } from "next-runtime-env"
+
+/**
+ * Server-side environment variables
+ */
+export interface ServerEnvConfig {
+  /** Nezha API base URL */
+  NezhaBaseUrl: string
+  /** Nezha API authentication token */
+  NezhaAuth: string
+  /** Default locale for the application */
+  DefaultLocale: string
+  /** Force show all servers */
+  ForceShowAllServers: boolean
+}
+
+/**
+ * Client-side environment variables (NEXT_PUBLIC_*)
+ */
+export interface ClientEnvConfig {
+  /** Nezha data fetch interval in milliseconds */
+  NezhaFetchInterval: number
+  /** Show country flags */
+  ShowFlag: boolean
+  /** Disable cartoon effects */
+  DisableCartoon: boolean
+  /** Show server tags */
+  ShowTag: boolean
+  /** Show network transfer information */
+  ShowNetTransfer: boolean
+  /** Force use SVG flags */
+  ForceUseSvgFlag: boolean
+  /** Fix server names at the top */
+  FixedTopServerName: boolean
+  /** Custom logo URL */
+  CustomLogo: string
+  /** Custom site title */
+  CustomTitle: string
+  /** Custom site description */
+  CustomDescription: string
+  /** Custom navigation links */
+  Links: string
+  /** Disable search engine indexing */
+  DisableIndex: boolean
+  /** Show tag count */
+  ShowTagCount: boolean
+  /** Show IP information */
+  ShowIpInfo: boolean
+}
+
+/**
+ * 环境变量键的类型定义
+ */
+export type EnvKey = ServerEnvKey | ClientEnvKey
+
+/**
+ * 服务器端环境变量键
+ */
+export type ServerEnvKey = keyof ServerEnvConfig
+
+/**
+ * 客户端环境变量键
+ */
+export type ClientEnvKey = `NEXT_PUBLIC_${keyof ClientEnvConfig}`
+
+/**
+ * Get a server-side environment variable
+ * @param key - Environment variable key
+ * @returns Environment variable value
+ */
+export function getServerEnv<K extends keyof ServerEnvConfig>(key: K): string {
+  const value = process.env[key]
+  if (!value) {
+    console.warn(`Environment variable ${key} is not set`)
+  }
+  return value || ""
+}
+
+/**
+ * Get a client-side environment variable
+ * @param key - Environment variable key
+ * @returns Environment variable value
+ */
+export function getClientEnv<K extends keyof ClientEnvConfig>(key: K): string {
+  const envKey = `NEXT_PUBLIC_${key}`
+  const value = env(envKey)
+  if (!value) {
+    console.warn(`Environment variable ${envKey} is not set`)
+  }
+  return value || ""
+}
+
+/**
+ * Parse boolean environment variable
+ * @param value - Environment variable value
+ * @returns Parsed boolean value
+ */
+export function parseBoolean(value: string | undefined): boolean {
+  return value?.toLowerCase() === "true"
+}
+
+/**
+ * Parse number environment variable
+ * @param value - Environment variable value
+ * @param defaultValue - Default value if parsing fails
+ * @returns Parsed number value
+ */
+export function parseNumber(value: string | undefined, defaultValue: number): number {
+  if (!value) return defaultValue
+  const parsed = Number.parseInt(value, 10)
+  return Number.isNaN(parsed) ? defaultValue : parsed
+}
+
+/**
+ * Get all environment variables with their current values
+ */
+export function getAllEnvConfig(): { server: ServerEnvConfig; client: ClientEnvConfig } {
+  return {
+    server: {
+      NezhaBaseUrl: getServerEnv("NezhaBaseUrl"),
+      NezhaAuth: getServerEnv("NezhaAuth"),
+      DefaultLocale: getServerEnv("DefaultLocale"),
+      ForceShowAllServers: parseBoolean(getServerEnv("ForceShowAllServers")),
+    },
+    client: {
+      NezhaFetchInterval: parseNumber(getClientEnv("NezhaFetchInterval"), 5000),
+      ShowFlag: parseBoolean(getClientEnv("ShowFlag")),
+      DisableCartoon: parseBoolean(getClientEnv("DisableCartoon")),
+      ShowTag: parseBoolean(getClientEnv("ShowTag")),
+      ShowNetTransfer: parseBoolean(getClientEnv("ShowNetTransfer")),
+      ForceUseSvgFlag: parseBoolean(getClientEnv("ForceUseSvgFlag")),
+      FixedTopServerName: parseBoolean(getClientEnv("FixedTopServerName")),
+      CustomLogo: getClientEnv("CustomLogo"),
+      CustomTitle: getClientEnv("CustomTitle"),
+      CustomDescription: getClientEnv("CustomDescription"),
+      Links: getClientEnv("Links"),
+      DisableIndex: parseBoolean(getClientEnv("DisableIndex")),
+      ShowTagCount: parseBoolean(getClientEnv("ShowTagCount")),
+      ShowIpInfo: parseBoolean(getClientEnv("ShowIpInfo")),
+    },
+  }
+}