diff --git a/.cursor/rules/doc-sync.mdc b/.cursor/rules/doc-sync.mdc
index 1272c61..073ba93 100644
--- a/.cursor/rules/doc-sync.mdc
+++ b/.cursor/rules/doc-sync.mdc
@@ -1,11 +1,13 @@
 ---
-description: 修改或新增 src/ 代码时同步更新 docs/ 技术文档
+description: 修改或新增 src/ 代码时，必须在同一轮对话中同步更新 docs/ 技术文档
 globs: src/**/*
-alwaysApply: false
+alwaysApply: true
 ---
 
 # 文档同步规则
 
+**修改 src/ 后必做**：在同一轮对话中，立即更新 `docs/` 中对应的技术文档。不要等到用户提醒。
+
 当你在 `src/` 下**新增或修改**任何文件时，必须同步更新 `docs/` 中对应的技术文档。
 
 ## 文件映射关系
@@ -35,3 +37,10 @@ API 与组件文档需补充类型说明、Props、Events 等。
 ## 示例
 
 修改 `src/api/event.ts` 后，需更新 `docs/api/event.md`；新增 `src/api/order.ts` 时，需新建 `docs/api/order.md`。
+
+## 修改后检查清单
+
+修改 `src/` 内任何文件后，在同一轮回复中完成：
+
+- [ ] 根据上表找到对应的 `docs/` 路径
+- [ ] 更新或新建该文档，反映本次代码变更
diff --git a/docs/components/TradeComponent.md b/docs/components/TradeComponent.md
index 6d3dbe8..ae63bfd 100644
--- a/docs/components/TradeComponent.md
+++ b/docs/components/TradeComponent.md
@@ -18,6 +18,7 @@
 
 - Buy/Sell Tab 切换
 - Market/Limit 类型、Merge/Split 菜单
+- **Buy 模式 Amount 区**：无论余额是否充足，均显示 Amount 标签、Balance、金额输入、+$1/+$20/+$100/Max 快捷按钮（桌面端、嵌入弹窗、移动端弹窗一致）
 - 余额不足时 Buy 显示 Deposit 按钮
 - 25%/50%/Max 快捷份额
 - 调用 market API 下单、Split、Merge
diff --git a/docs/core/App.md b/docs/core/App.md
index f779ff9..780a04b 100644
--- a/docs/core/App.md
+++ b/docs/core/App.md
@@ -8,9 +8,10 @@
 
 ## 核心能力
 
-- 顶部导航栏：返回、PolyMarket 标题、Login 或余额+头像菜单
+- 顶部导航栏：返回、PolyMarket 标题、Login 或余额+用户名+头像菜单
 - 登录态：`userStore.isLoggedIn` 控制展示
-- 挂载时：若已登录，拉取用户信息与余额
+- 用户名：`nickName` 或 `userName` 显示在头像左侧（有值时）
+- 挂载时与 `isLoggedIn` 变为 true 时：拉取用户信息与余额（`router.isReady()` + `nextTick` 后执行），确保钱包登录、刷新页面后头像和用户名正确显示
 - keep-alive：`include="['Home']"` 缓存首页
 
 ## 扩展方式
diff --git a/docs/stores/user.md b/docs/stores/user.md
index 97b2d34..b05683c 100644
--- a/docs/stores/user.md
+++ b/docs/stores/user.md
@@ -15,6 +15,7 @@
 - `logout`：清空并清除持久化
 - `getAuthHeaders`：返回 `{ 'x-token', 'x-user-id' }`，未登录时返回 `undefined`
 - `fetchUserInfo`、`fetchUsdcBalance`：拉取并更新用户信息与余额
+- `fetchUserInfo` 兼容多种 API 字段名：`userName`/`username`、`nickName`/`nickname`、`headerImg`/`avatar`/`avatarUrl`；支持 `data` 直接为用户对象或 `data.user` 嵌套结构
 
 ## 使用方式
 
@@ -41,3 +42,7 @@ await userStore.fetchUsdcBalance()
 1. **多端登录**：扩展 `setUser` 支持多设备 token 管理
 2. **Token 刷新**：在 `getAuthHeaders` 或请求拦截器中加入 refresh 逻辑
 3. **登出回调**：在 `logout` 中增加清理逻辑（如取消订阅、重置其他 store）
+
+## 登录后刷新用户信息
+
+钱包登录（Login.vue）成功后需调用 `fetchUserInfo()` 以获取完整用户信息（头像、昵称）。App.vue 在 `onMounted` 与 `watch(isLoggedIn)` 时也会调用，确保自动登录或刷新页面后能正确显示。
diff --git a/src/App.vue b/src/App.vue
index f6c49f5..7bd74e6 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,21 +1,35 @@
 <script setup lang="ts">
-import { computed, onMounted } from 'vue'
-import { useRoute } from 'vue-router'
+import { computed, onMounted, watch, nextTick } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
 import { useUserStore } from './stores/user'
 
 const route = useRoute()
+const router = useRouter()
 const userStore = useUserStore()
 
-const currentRoute = computed(() => {
-  return route.path
-})
+const currentRoute = computed(() => route.path)
+const displayName = computed(
+  () => userStore.user?.nickName || userStore.user?.userName || ''
+)
+
+async function refreshUserData() {
+  if (!userStore.isLoggedIn) return
+  await router.isReady()
+  await nextTick()
+  await userStore.fetchUserInfo()
+  await userStore.fetchUsdcBalance()
+}
 
 onMounted(() => {
-  if (userStore.isLoggedIn) {
-    userStore.fetchUserInfo()
-    userStore.fetchUsdcBalance()
-  }
+  refreshUserData()
 })
+watch(
+  () => userStore.isLoggedIn,
+  (loggedIn) => {
+    if (loggedIn) refreshUserData()
+  },
+  { immediate: true },
+)
 </script>
 
 <template>
@@ -51,6 +65,7 @@ onMounted(() => {
         >
           <span class="balance-text">${{ userStore.balance }}</span>
         </v-btn>
+        <span v-if="displayName" class="header-username">{{ displayName }}</span>
         <v-menu location="bottom" :close-on-content-click="false">
           <template #activator="{ props }">
             <v-btn v-bind="props" icon variant="text" class="avatar-btn">
@@ -92,6 +107,16 @@ onMounted(() => {
   text-transform: none;
 }
 
+.header-username {
+  font-size: 0.9rem;
+  color: rgba(255, 255, 255, 0.95);
+  margin-right: 4px;
+  max-width: 120px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 .balance-text {
   font-weight: 500;
   font-size: 0.95rem;
diff --git a/src/components/TradeComponent.vue b/src/components/TradeComponent.vue
index 675abb1..9b0d603 100644
--- a/src/components/TradeComponent.vue
+++ b/src/components/TradeComponent.vue
@@ -56,6 +56,24 @@
           </v-btn>
         </div>
 
+        <!-- Buy Market: Amount 区（余额充足时也显示） -->
+        <template v-if="activeTab === 'buy'">
+          <div class="input-group">
+            <div class="amount-header">
+              <div>
+                <span class="label amount-label">Amount</span>
+                <span class="balance-label">Balance ${{ balance.toFixed(2) }}</span>
+              </div>
+              <div class="amount-value">${{ amount.toFixed(2) }}</div>
+            </div>
+            <div class="amount-buttons">
+              <v-btn class="amount-btn" @click="adjustAmount(1)">+$1</v-btn>
+              <v-btn class="amount-btn" @click="adjustAmount(20)">+$20</v-btn>
+              <v-btn class="amount-btn" @click="adjustAmount(100)">+$100</v-btn>
+              <v-btn class="amount-btn" @click="setMaxAmount">Max</v-btn>
+            </div>
+          </div>
+        </template>
         <!-- Sell Market: Shares input + 25%/50%/Max -->
         <template v-if="activeTab === 'sell'">
           <div class="input-group shares-group">
@@ -441,6 +459,24 @@
                 >{{ noLabel }} {{ noPriceCents }}¢</v-btn
               >
             </div>
+            <!-- Buy Market: Amount 区（余额充足时也显示） -->
+            <template v-if="activeTab === 'buy'">
+              <div class="input-group">
+                <div class="amount-header">
+                  <div>
+                    <span class="label amount-label">Amount</span>
+                    <span class="balance-label">Balance ${{ balance.toFixed(2) }}</span>
+                  </div>
+                  <div class="amount-value">${{ amount.toFixed(2) }}</div>
+                </div>
+                <div class="amount-buttons">
+                  <v-btn class="amount-btn" @click="adjustAmount(1)">+$1</v-btn>
+                  <v-btn class="amount-btn" @click="adjustAmount(20)">+$20</v-btn>
+                  <v-btn class="amount-btn" @click="adjustAmount(100)">+$100</v-btn>
+                  <v-btn class="amount-btn" @click="setMaxAmount">Max</v-btn>
+                </div>
+              </div>
+            </template>
             <!-- Sell Market: Shares input + 25%/50%/Max -->
             <template v-if="activeTab === 'sell'">
               <div class="input-group shares-group">
@@ -809,6 +845,24 @@
                   >{{ noLabel }} {{ noPriceCents }}¢</v-btn
                 >
               </div>
+              <!-- Buy Market: Amount 区（余额充足时也显示） -->
+              <template v-if="activeTab === 'buy'">
+                <div class="input-group">
+                  <div class="amount-header">
+                    <div>
+                      <span class="label amount-label">Amount</span>
+                      <span class="balance-label">Balance ${{ balance.toFixed(2) }}</span>
+                    </div>
+                    <div class="amount-value">${{ amount.toFixed(2) }}</div>
+                  </div>
+                  <div class="amount-buttons">
+                    <v-btn class="amount-btn" @click="adjustAmount(1)">+$1</v-btn>
+                    <v-btn class="amount-btn" @click="adjustAmount(20)">+$20</v-btn>
+                    <v-btn class="amount-btn" @click="adjustAmount(100)">+$100</v-btn>
+                    <v-btn class="amount-btn" @click="setMaxAmount">Max</v-btn>
+                  </div>
+                </div>
+              </template>
               <!-- Sell Market: Shares input + 25%/50%/Max -->
               <template v-if="activeTab === 'sell'">
                 <div class="input-group shares-group">
diff --git a/src/stores/user.ts b/src/stores/user.ts
index 0c850c5..5ea16fe 100644
--- a/src/stores/user.ts
+++ b/src/stores/user.ts
@@ -96,14 +96,15 @@ export const useUserStore = defineStore('user', () => {
     try {
       const res = await getUserInfo(headers)
       console.log('[fetchUserInfo] 接口响应:', JSON.stringify(res, null, 2))
-      if ((res.code === 0 || res.code === 200) && res.data) {
-        const u = res.data
+      const data = res.data as Record<string, unknown> | undefined
+      const u = (data?.user ?? data) as Record<string, unknown>
+      if ((res.code === 0 || res.code === 200) && u) {
         user.value = {
-          id: u.ID,
-          ID: u.ID,
-          userName: u.userName,
-          nickName: u.nickName,
-          headerImg: u.headerImg,
+          id: u.ID as number | string | undefined,
+          ID: u.ID as number | undefined,
+          userName: (u.userName ?? u.username) as string | undefined,
+          nickName: (u.nickName ?? u.nickname) as string | undefined,
+          headerImg: (u.headerImg ?? u.avatar ?? u.avatarUrl) as string | undefined,
           ...u,
         }
         if (token.value && user.value) saveToStorage(token.value, user.value)
diff --git a/src/views/Login.vue b/src/views/Login.vue
index 9dc214f..d6752ce 100644
--- a/src/views/Login.vue
+++ b/src/views/Login.vue
@@ -184,7 +184,8 @@ const connectWithWallet = async () => {
       const { token, user } = loginData.data
       console.log('[walletLogin] 存入 store 的 user:', JSON.stringify(user, null, 2))
       userStore.setUser({ token, user })
-      userStore.fetchUsdcBalance()
+      await userStore.fetchUserInfo()
+      await userStore.fetchUsdcBalance()
     }
 
     router.push('/')