目录结构调整

codes/minipro/calculation/miniprogram/pages/index/index.wxml

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+<!--index.wxml-->
+<scroll-view class="scrollarea" scroll-y type="list">
+  <view class="container">
+    
+    <!-- 顶部背景区 -->
+    <view class="header-bg">
+        <view class="header-content" bindtap="goToProfile">
+            <view class="text-area">
+                <text class="greeting">{{greeting}}</text>
+                <text class="nickname">{{userInfo.nickName}}</text>
+            </view>
+            <view class="avatar-wrapper">
+                <image class="avatar" src="{{userInfo.avatarUrl}}"></image>
+            </view>
+        </view>
+    </view>
+
+    <!-- 主要内容区（向上浮动覆盖背景） -->
+    <view class="main-content">
+        <view class="section-title">工具箱</view>
+        
+        <!-- 功能网格 -->
+        <view class="grid-container">
+            <!-- 计算器 -->
+            <view class="grid-item" bindtap="goToCalculator" hover-class="grid-item-hover">
+                <view class="icon-box bg-gradient-blue">
+                    <text class="icon">🧮</text>
+                </view>
+                <view class="text-box">
+                    <text class="label">计算器</text>
+                    <text class="sub-label">日常计算</text>
+                </view>
+            </view>
+
+            <!-- 单位换算 -->
+            <view class="grid-item" bindtap="goToUnitConverter" hover-class="grid-item-hover">
+                <view class="icon-box bg-gradient-green">
+                    <text class="icon">⚖️</text>
+                </view>
+                <view class="text-box">
+                    <text class="label">单位换算</text>
+                    <text class="sub-label">长度/重量...</text>
+                </view>
+            </view>
+
+             <!-- 谁去拿外卖 -->
+            <view class="grid-item" bindtap="goToRandomDraw" hover-class="grid-item-hover">
+                <view class="icon-box bg-gradient-purple">
+                    <text class="icon">🎲</text>
+                </view>
+                <view class="text-box">
+                    <text class="label">谁去拿外卖</text>
+                    <text class="sub-label">随机抽取幸运儿</text>
+                </view>
+            </view>
+        </view>
+
+        <!-- 推广/banner区域 -->
+        <view class="banner" bindtap="goToProfile" wx:if="{{!hasUserInfo}}">
+            <view class="banner-text">
+                <text class="banner-title">点击登录 / 完善信息</text>
+                <text class="banner-desc">绑定手机号，体验更多云端功能</text>
+            </view>
+            <view class="banner-icon">📝</view>
+        </view>
+    </view>
+
+  </view>
+</scroll-view>