diff --git a/web-app/src/store/index.ts b/web-app/src/store/index.ts
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+++ b/web-app/src/store/index.ts
@@ -0,0 +1,286 @@
+/**
+ * MVU (Model-View-Update) 状态管理 Store
+ * 基于 Zustand 实现的轻量级状态管理
+ */
+
+import { create } from 'zustand'
+import { devtools, persist } from 'zustand/middleware'
+
+// ============= Model (状态模型) =============
+
+export interface User {
+  id: number
+  username: string
+  email: string
+  avatar?: string
+}
+
+export interface Character {
+  id: number
+  name: string
+  avatar: string
+  description: string
+}
+
+export interface Conversation {
+  id: number
+  characterId: number
+  title: string
+  lastMessage?: string
+  updatedAt: string
+}
+
+export interface Message {
+  id: number
+  role: 'user' | 'assistant'
+  content: string
+  timestamp: string
+}
+
+export interface AppState {
+  // 用户状态
+  user: User | null
+  isAuthenticated: boolean
+
+  // 当前选中的实体
+  currentCharacter: Character | null
+  currentConversation: Conversation | null
+
+  // 消息列表
+  messages: Message[]
+
+  // UI 状态
+  sidebarOpen: boolean
+  loading: boolean
+  error: string | null
+
+  // 变量系统
+  variables: Record<string, string>
+}
+
+// ============= Update (状态更新) =============
+
+export interface AppActions {
+  // 用户操作
+  setUser: (user: User | null) => void
+  login: (user: User) => void
+  logout: () => void
+
+  // 角色操作
+  setCurrentCharacter: (character: Character | null) => void
+
+  // 对话操作
+  setCurrentConversation: (conversation: Conversation | null) => void
+
+  // 消息操作
+  setMessages: (messages: Message[]) => void
+  addMessage: (message: Message) => void
+  updateMessage: (id: number, content: string) => void
+  deleteMessage: (id: number) => void
+  clearMessages: () => void
+
+  // UI 操作
+  toggleSidebar: () => void
+  setSidebarOpen: (open: boolean) => void
+  setLoading: (loading: boolean) => void
+  setError: (error: string | null) => void
+
+  // 变量系统操作
+  setVariable: (key: string, value: string) => void
+  getVariable: (key: string) => string | undefined
+  deleteVariable: (key: string) => void
+  clearVariables: () => void
+
+  // 批量更新（用于复杂操作）
+  batchUpdate: (updater: (state: AppState) => Partial<AppState>) => void
+}
+
+// ============= Store (状态容器) =============
+
+const initialState: AppState = {
+  user: null,
+  isAuthenticated: false,
+  currentCharacter: null,
+  currentConversation: null,
+  messages: [],
+  sidebarOpen: true,
+  loading: false,
+  error: null,
+  variables: {
+    user: '',
+    char: '',
+  },
+}
+
+export const useAppStore = create<AppState & AppActions>()(
+  devtools(
+    persist(
+      (set, get) => ({
+        ...initialState,
+
+        // 用户操作
+        setUser: (user) => set({ user, isAuthenticated: !!user }),
+
+        login: (user) => set({
+          user,
+          isAuthenticated: true,
+          variables: {
+            ...get().variables,
+            user: user.username,
+          }
+        }),
+
+        logout: () => set({
+          user: null,
+          isAuthenticated: false,
+          currentCharacter: null,
+          currentConversation: null,
+          messages: [],
+          variables: {
+            user: '',
+            char: '',
+          }
+        }),
+
+        // 角色操作
+        setCurrentCharacter: (character) => set({
+          currentCharacter: character,
+          variables: {
+            ...get().variables,
+            char: character?.name || '',
+          }
+        }),
+
+        // 对话操作
+        setCurrentConversation: (conversation) => set({ currentConversation: conversation }),
+
+        // 消息操作
+        setMessages: (messages) => set({ messages }),
+
+        addMessage: (message) => set((state) => ({
+          messages: [...state.messages, message]
+        })),
+
+        updateMessage: (id, content) => set((state) => ({
+          messages: state.messages.map(msg =>
+            msg.id === id ? { ...msg, content } : msg
+          )
+        })),
+
+        deleteMessage: (id) => set((state) => ({
+          messages: state.messages.filter(msg => msg.id !== id)
+        })),
+
+        clearMessages: () => set({ messages: [] }),
+
+        // UI 操作
+        toggleSidebar: () => set((state) => ({ sidebarOpen: !state.sidebarOpen })),
+        setSidebarOpen: (open) => set({ sidebarOpen: open }),
+        setLoading: (loading) => set({ loading }),
+        setError: (error) => set({ error }),
+
+        // 变量系统操作
+        setVariable: (key, value) => set((state) => ({
+          variables: { ...state.variables, [key]: value }
+        })),
+
+        getVariable: (key) => get().variables[key],
+
+        deleteVariable: (key) => set((state) => {
+          const { [key]: _, ...rest } = state.variables
+          return { variables: rest }
+        }),
+
+        clearVariables: () => set({
+          variables: { user: get().user?.username || '', char: get().currentCharacter?.name || '' }
+        }),
+
+        // 批量更新
+        batchUpdate: (updater) => set((state) => updater(state)),
+      }),
+      {
+        name: 'app-storage',
+        partialize: (state) => ({
+          user: state.user,
+          isAuthenticated: state.isAuthenticated,
+          sidebarOpen: state.sidebarOpen,
+          variables: state.variables,
+        }),
+      }
+    )
+  )
+)
+
+// ============= Selectors (状态选择器) =============
+
+export const selectUser = (state: AppState & AppActions) => state.user
+export const selectIsAuthenticated = (state: AppState & AppActions) => state.isAuthenticated
+export const selectCurrentCharacter = (state: AppState & AppActions) => state.currentCharacter
+export const selectCurrentConversation = (state: AppState & AppActions) => state.currentConversation
+export const selectMessages = (state: AppState & AppActions) => state.messages
+export const selectSidebarOpen = (state: AppState & AppActions) => state.sidebarOpen
+export const selectLoading = (state: AppState & AppActions) => state.loading
+export const selectError = (state: AppState & AppActions) => state.error
+export const selectVariables = (state: AppState & AppActions) => state.variables
+
+// ============= 变量替换工具函数 =============
+
+/**
+ * 替换文本中的变量
+ * 支持的变量格式：{{user}}, {{char}}, {{random}}, {{time}}, {{date}} 等
+ */
+export function substituteVariables(text: string, customVars?: Record<string, string>): string {
+  const state = useAppStore.getState()
+  const variables = { ...state.variables, ...customVars }
+
+  let result = text
+
+  // 替换用户定义的变量
+  Object.entries(variables).forEach(([key, value]) => {
+    const regex = new RegExp(`\\{\\{${key}\\}\\}`, 'gi')
+    result = result.replace(regex, value)
+  })
+
+  // 替换时间变量
+  const now = new Date()
+  result = result.replace(/\{\{time\}\}/gi, now.toLocaleTimeString('en-US', { hour12: false }))
+  result = result.replace(/\{\{time_12h\}\}/gi, now.toLocaleTimeString('en-US', { hour12: true }))
+  result = result.replace(/\{\{date\}\}/gi, now.toLocaleDateString('en-CA')) // YYYY-MM-DD
+  result = result.replace(/\{\{date_short\}\}/gi, now.toLocaleDateString('en-US')) // MM/DD/YYYY
+  result = result.replace(/\{\{datetime\}\}/gi, now.toLocaleString())
+  result = result.replace(/\{\{timestamp\}\}/gi, now.getTime().toString())
+  result = result.replace(/\{\{weekday\}\}/gi, now.toLocaleDateString('en-US', { weekday: 'long' }))
+  result = result.replace(/\{\{month\}\}/gi, now.toLocaleDateString('en-US', { month: 'long' }))
+  result = result.replace(/\{\{year\}\}/gi, now.getFullYear().toString())
+
+  // 替换随机数变量
+  result = result.replace(/\{\{random:(\d+)-(\d+)\}\}/gi, (_, min, max) => {
+    const minNum = parseInt(min)
+    const maxNum = parseInt(max)
+    return Math.floor(Math.random() * (maxNum - minNum + 1) + minNum).toString()
+  })
+  result = result.replace(/\{\{random\}\}/gi, () => Math.floor(Math.random() * 100).toString())
+
+  // 随机选择 {{pick:option1|option2|option3}}
+  result = result.replace(/\{\{pick:([^}]+)\}\}/gi, (_, options) => {
+    const optionList = options.split('|')
+    return optionList[Math.floor(Math.random() * optionList.length)]
+  })
+
+  // 替换特殊字符
+  result = result.replace(/\{\{newline\}\}/gi, '\n')
+  result = result.replace(/\{\{tab\}\}/gi, '\t')
+  result = result.replace(/\{\{space\}\}/gi, ' ')
+  result = result.replace(/\{\{empty\}\}/gi, '')
+
+  return result
+}
+
+/**
+ * 从文本中提取变量
+ */
+export function extractVariables(text: string): string[] {
+  const regex = /\{\{([^}]+)\}\}/g
+  const matches = text.matchAll(regex)
+  return Array.from(matches, m => m[1])
+}