diff --git a/admin/src/views/Certifications.vue b/admin/src/views/Certifications.vue
index f2a588e..f6b5ec4 100644
--- a/admin/src/views/Certifications.vue
+++ b/admin/src/views/Certifications.vue
@@ -1,35 +1,35 @@
 <template>
-  <div>
-    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px;">
-      <h3 style="margin: 0;">跑腿认证审核</h3>
-      <el-select v-model="statusFilter" placeholder="筛选状态" clearable style="width: 150px;" @change="fetchList">
+  <div class="cert-page">
+    <div class="page-header">
+      <h3>跑腿认证审核</h3>
+      <el-select v-model="statusFilter" placeholder="筛选状态" clearable style="width: 160px;" @change="fetchList">
         <el-option label="待审核" value="Pending" />
         <el-option label="已通过" value="Approved" />
         <el-option label="已拒绝" value="Rejected" />
       </el-select>
     </div>
 
-    <el-table :data="list" v-loading="loading" border>
-      <el-table-column prop="id" label="ID" width="60" />
-      <el-table-column prop="userId" label="用户ID" width="80" />
-      <el-table-column prop="userNickname" label="用户昵称" width="120" />
-      <el-table-column prop="realName" label="真实姓名" width="120" />
-      <el-table-column prop="phone" label="手机号" width="140" />
-      <el-table-column label="状态" width="100">
+    <el-table :data="list" v-loading="loading" stripe :header-cell-style="{ background: '#fafafa', color: '#333', fontWeight: 600 }" style="width: 100%;">
+      <el-table-column prop="id" label="ID" width="70" align="center" />
+      <el-table-column prop="userId" label="用户ID" width="90" align="center" />
+      <el-table-column prop="userNickname" label="用户昵称" min-width="130" show-overflow-tooltip />
+      <el-table-column prop="realName" label="真实姓名" min-width="120" show-overflow-tooltip />
+      <el-table-column prop="phone" label="手机号" min-width="140" />
+      <el-table-column label="状态" width="110" align="center">
         <template #default="{ row }">
-          <el-tag :type="statusTagType(row.status)">{{ statusLabel(row.status) }}</el-tag>
+          <el-tag :type="statusTagType(row.status)" effect="light" round>{{ statusLabel(row.status) }}</el-tag>
         </template>
       </el-table-column>
-      <el-table-column prop="createdAt" label="申请时间" width="170">
+      <el-table-column label="申请时间" min-width="180">
         <template #default="{ row }">{{ formatTime(row.createdAt) }}</template>
       </el-table-column>
-      <el-table-column label="操作" width="180" fixed="right">
+      <el-table-column label="操作" width="200" align="center" fixed="right">
         <template #default="{ row }">
           <template v-if="row.status === 'Pending'">
-            <el-button size="small" type="success" @click="handleReview(row, 'Approved')">通过</el-button>
-            <el-button size="small" type="danger" @click="handleReview(row, 'Rejected')">拒绝</el-button>
+            <el-button size="small" type="success" plain @click="handleReview(row, 'Approved')">通过</el-button>
+            <el-button size="small" type="danger" plain @click="handleReview(row, 'Rejected')">拒绝</el-button>
           </template>
-          <span v-else style="color: #909399;">已处理</span>
+          <el-tag v-else :type="statusTagType(row.status)" effect="plain" size="small">{{ statusLabel(row.status) }}</el-tag>
         </template>
       </el-table-column>
     </el-table>
@@ -69,3 +69,20 @@ async function handleReview(row, status) {
 
 onMounted(fetchList)
 </script>
+
+<style scoped>
+.cert-page {
+  padding: 4px;
+}
+.page-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 20px;
+}
+.page-header h3 {
+  margin: 0;
+  font-size: 18px;
+  color: #303133;
+}
+</style>
diff --git a/miniapp/App.vue b/miniapp/App.vue
index c5058d3..830428d 100644
--- a/miniapp/App.vue
+++ b/miniapp/App.vue
@@ -1,4 +1,6 @@
 <script>
+	import { initIM } from './utils/im'
+
 	export default {
 		onLaunch: function() {
 			// 检查本地登录凭证，过期则静默清除，不跳转登录页
@@ -13,13 +15,20 @@
 						// token 已过期，静默清除
 						uni.removeStorageSync('token')
 						uni.removeStorageSync('userInfo')
+						return
 					}
 				}
 			} catch (e) {
 				// 解析失败，清除无效 token
 				uni.removeStorageSync('token')
 				uni.removeStorageSync('userInfo')
+				return
 			}
+
+			// token 有效，后台初始化 IM
+			initIM().catch(e => {
+				console.log('[App] IM 初始化失败（非阻塞）:', e.message)
+			})
 		},
 		onShow: function() {},
 		onHide: function() {}
diff --git a/miniapp/manifest.json b/miniapp/manifest.json
index 1cd36dc..95cae1d 100644
--- a/miniapp/manifest.json
+++ b/miniapp/manifest.json
@@ -50,7 +50,7 @@
     "quickapp" : {},
     /* 小程序特有相关 */
     "mp-weixin" : {
-        "appid" : "wx626fd4a47944e3ea",
+        "appid" : "wxd62aec23fcb79bc6",
         "setting" : {
             "urlCheck" : false
         },
diff --git a/miniapp/package-lock.json b/miniapp/package-lock.json
index b42db5c..12cfbcf 100644
--- a/miniapp/package-lock.json
+++ b/miniapp/package-lock.json
@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "@tencentcloud/chat": "^3.6.6",
         "pinia": "^3.0.4"
       },
       "devDependencies": {
@@ -867,6 +868,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@tencentcloud/chat": {
+      "version": "3.6.6",
+      "resolved": "https://registry.npmjs.org/@tencentcloud/chat/-/chat-3.6.6.tgz",
+      "integrity": "sha512-PYPGUoZHw3GjDgM0N72qr0K/Wjp28HAoGaND077sbUQEwYFaMjZ1tuBQZugFG6v8OS8Ihx71yqNshR3xDHvYaA==",
+      "license": "ISC"
+    },
     "node_modules/@types/chai": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
diff --git a/miniapp/package.json b/miniapp/package.json
index db3df93..ca92f76 100644
--- a/miniapp/package.json
+++ b/miniapp/package.json
@@ -11,6 +11,7 @@
   "license": "ISC",
   "type": "commonjs",
   "dependencies": {
+    "@tencentcloud/chat": "^3.6.6",
     "pinia": "^3.0.4"
   },
   "devDependencies": {
diff --git a/miniapp/pages/index/index.vue b/miniapp/pages/index/index.vue
index 34ba5a1..12102ce 100644
--- a/miniapp/pages/index/index.vue
+++ b/miniapp/pages/index/index.vue
@@ -122,12 +122,12 @@
 
 	.banner-swiper {
 		width: 100%;
-		height: 400rpx;
+		height: 374rpx;
 	}
 
 	.banner-image {
 		width: 100%;
-		height: 400rpx;
+		height: 374rpx;
 	}
 
 	/* 服务入口卡片列表 */
diff --git a/miniapp/pages/message/chat.vue b/miniapp/pages/message/chat.vue
index 6685db0..63688f8 100644
--- a/miniapp/pages/message/chat.vue
+++ b/miniapp/pages/message/chat.vue
@@ -25,12 +25,16 @@
 			scroll-y
 			:scroll-top="scrollTop"
 			scroll-with-animation
+			@scrolltoupper="loadMoreHistory"
 		>
+			<view v-if="loadingHistory" class="loading-history">
+				<text>加载中...</text>
+			</view>
 			<view
 				class="msg-row"
 				:class="{ 'msg-self': msg.isSelf, 'msg-center': msg.type === 'system' || msg.type === 'price-change' }"
 				v-for="(msg, index) in chatMessages"
-				:key="index"
+				:key="msg.id || index"
 			>
 				<!-- 系统提示消息（居中显示） -->
 				<view v-if="msg.type === 'system'" class="msg-system">
@@ -58,7 +62,6 @@
 							</text>
 						</view>
 					</view>
-					<!-- 待处理状态：对方可操作 -->
 					<view v-if="msg.status === 'Pending' && !msg.isSelf" class="pc-actions">
 						<view class="pc-btn pc-accept" @click="respondPriceChange(msg.priceChangeId, 'Accepted')">
 							<text>同意</text>
@@ -67,11 +70,9 @@
 							<text>拒绝</text>
 						</view>
 					</view>
-					<!-- 等待确认提示 -->
 					<view v-else-if="msg.status === 'Pending' && msg.isSelf" class="pc-waiting">
 						<text>等待对方确认中</text>
 					</view>
-					<!-- 已处理状态 -->
 					<view v-else class="pc-result">
 						<text :class="msg.status === 'Accepted' ? 'pc-accepted' : 'pc-rejected'">
 							{{ msg.status === 'Accepted' ? '已同意' : '已拒绝' }}
@@ -182,81 +183,64 @@
 				</view>
 			</view>
 		</view>
-
-		<!-- 电话弹窗 -->
-		<view v-if="showPhonePopup" class="popup-mask" @click="showPhonePopup = false">
-			<view class="phone-popup" @click.stop>
-				<text class="phone-title">对方手机号</text>
-				<text class="phone-number">{{ targetPhone }}</text>
-				<view class="phone-actions">
-					<view class="phone-btn call-btn" @click="callPhone">
-						<text>拨打电话</text>
-					</view>
-					<view class="phone-btn copy-btn" @click="copyPhone">
-						<text>复制电话</text>
-					</view>
-				</view>
-				<view class="phone-cancel" @click="showPhonePopup = false">
-					<text>取消</text>
-				</view>
-			</view>
-		</view>
 	</view>
 </template>
 
 <script>
 import { getOrderDetail, createPriceChange, respondPriceChange as respondPriceChangeApi } from '../../utils/api'
-import { uploadFile } from '../../utils/request'
 import { useUserStore } from '../../stores/user'
+import {
+	initIM, logoutIM, onNewMessage, offNewMessage,
+	getMessageList, sendTextMessage, sendImageMessage,
+	sendCustomMessage, formatIMMessage
+} from '../../utils/im'
 
 export default {
 	data() {
 		return {
 			orderId: null,
-			targetUserId: null,
 			orderInfo: {},
 			chatMessages: [],
 			inputText: '',
 			scrollTop: 0,
 			showMoreMenu: false,
-			showPhonePopup: false,
-			targetPhone: '',
-			// 改价弹窗状态
+			// IM 相关
+			imUserId: '',
+			targetImUserId: '',
+			imReady: false,
+			nextReqMessageID: '',
+			historyCompleted: false,
+			loadingHistory: false,
+			// 改价弹窗
 			showPriceChangePopup: false,
-			priceChangeType: '', // 'Commission' 或 'GoodsAmount'
+			priceChangeType: '',
 			newPriceInput: '',
 			submittingPriceChange: false,
 			statusBarHeight: 0
 		}
 	},
 	computed: {
-		/** 当前用户是否为跑腿 */
 		isRunner() {
 			const userStore = useUserStore()
 			return this.orderInfo.runnerId === userStore.userId
 		},
-		/** 当前用户是否为单主 */
 		isOwner() {
 			const userStore = useUserStore()
 			return this.orderInfo.ownerId === userStore.userId
 		},
-		/** 是否显示更改商品价格按钮 */
 		showGoodsPriceBtn() {
 			const type = this.orderInfo.orderType
 			return type === 'Purchase' || type === 'Food'
 		},
-		/** 改价弹窗标题 */
 		priceChangeTypeLabel() {
 			return this.priceChangeType === 'Commission' ? '更改跑腿价格' : '更改商品价格'
 		},
-		/** 当前改价对应的原价 */
 		currentPriceForChange() {
 			if (this.priceChangeType === 'Commission') {
 				return (this.orderInfo.commission || 0).toFixed(2)
 			}
 			return (this.orderInfo.goodsAmount || 0).toFixed(2)
 		},
-		/** 改价差额（正数=补缴，负数=退款） */
 		priceDifference() {
 			const newPrice = parseFloat(this.newPriceInput)
 			if (isNaN(newPrice) || newPrice < 0) return 0
@@ -266,54 +250,117 @@ export default {
 			return newPrice - original
 		}
 	},
-	onLoad(options) {
+	async onLoad(options) {
 		const sysInfo = uni.getSystemInfoSync()
 		this.statusBarHeight = sysInfo.statusBarHeight || 0
 		this.orderId = options.orderId
-		this.targetUserId = options.targetUserId
-		this.loadOrderInfo()
-		this.loadChatMessages()
+		await this.loadOrderInfo()
+		await this.loginIM()
+	},
+	onUnload() {
+		// 离开页面时移除消息监听
+		offNewMessage()
 	},
 	methods: {
 		goBack() { uni.navigateBack() },
+
 		/** 加载订单信息 */
 		async loadOrderInfo() {
 			if (!this.orderId) return
 			try {
 				const res = await getOrderDetail(this.orderId)
 				this.orderInfo = res || {}
+			} catch (e) {}
+		},
+
+		/** 登录 IM 并加载历史消息 */
+		async loginIM() {
+			try {
+				const { userId } = await initIM()
+				this.imUserId = userId
+
+				// 确定对方 IM 用户 ID
+				const userStore = useUserStore()
+				if (this.orderInfo.ownerId === userStore.userId) {
+					// 当前用户是单主，对方是跑腿
+					this.targetImUserId = `user_${this.orderInfo.runnerId}`
+				} else {
+					// 当前用户是跑腿，对方是单主
+					this.targetImUserId = `user_${this.orderInfo.ownerId}`
+				}
+
+				this.imReady = true
+
+				// 监听新消息
+				onNewMessage((msgList) => {
+					for (const msg of msgList) {
+						// 只处理当前会话的消息
+						if (msg.from === this.targetImUserId || msg.from === this.imUserId) {
+							const formatted = formatIMMessage(msg, this.imUserId)
+							this.chatMessages.push(formatted)
+						}
+					}
+					this.scrollToBottom()
+				})
+
+				// 拉取历史消息
+				await this.loadHistory()
 			} catch (e) {
-				// 静默处理
+				console.error('[IM] 初始化失败:', e)
+				uni.showToast({ title: 'IM连接失败，消息功能暂不可用', icon: 'none' })
 			}
 		},
 
-		/** 加载聊天记录（腾讯 IM SDK 集成后替换） */
-		loadChatMessages() {
-			// TODO: 集成腾讯 IM SDK 后，从 SDK 获取历史消息
+		/** 拉取历史消息 */
+		async loadHistory() {
+			if (!this.imReady || !this.targetImUserId) return
+			this.loadingHistory = true
+			try {
+				const res = await getMessageList(this.targetImUserId, this.nextReqMessageID)
+				const formatted = res.messageList.map(m => formatIMMessage(m, this.imUserId))
+				// 历史消息插入到前面
+				this.chatMessages = [...formatted, ...this.chatMessages]
+				this.nextReqMessageID = res.nextReqMessageID
+				this.historyCompleted = res.isCompleted
+				this.scrollToBottom()
+			} catch (e) {
+				console.error('[IM] 拉取历史消息失败:', e)
+			} finally {
+				this.loadingHistory = false
+			}
+		},
+
+		/** 上拉加载更多历史 */
+		async loadMoreHistory() {
+			if (this.historyCompleted || this.loadingHistory) return
+			await this.loadHistory()
 		},
 
 		/** 发送文本消息 */
-		sendMessage() {
+		async sendMessage() {
 			if (!this.inputText.trim()) return
-			// TODO: 通过腾讯 IM SDK 发送消息
-			this.chatMessages.push({
-				type: 'text',
-				content: this.inputText,
-				isSelf: true,
-				avatar: ''
-			})
+			if (!this.imReady) {
+				uni.showToast({ title: 'IM未就绪', icon: 'none' })
+				return
+			}
+			const text = this.inputText
 			this.inputText = ''
-			this.scrollToBottom()
+			try {
+				const msg = await sendTextMessage(this.targetImUserId, text)
+				this.chatMessages.push(formatIMMessage(msg, this.imUserId))
+				this.scrollToBottom()
+			} catch (e) {
+				uni.showToast({ title: '发送失败', icon: 'none' })
+				this.inputText = text
+			}
 		},
 
-		/** 滚动到底部 */
 		scrollToBottom() {
 			this.$nextTick(() => {
-				this.scrollTop = 99999
+				this.scrollTop = this.scrollTop === 99999 ? 99998 : 99999
 			})
 		},
 
-		/** 切换更多菜单 */
 		toggleMoreMenu() {
 			this.showMoreMenu = !this.showMoreMenu
 		},
@@ -321,20 +368,18 @@ export default {
 		/** 发送图片 */
 		onSendImage() {
 			this.showMoreMenu = false
+			if (!this.imReady) {
+				uni.showToast({ title: 'IM未就绪', icon: 'none' })
+				return
+			}
 			uni.chooseImage({
 				count: 1,
 				sourceType: ['album', 'camera'],
 				success: async (res) => {
 					const tempPath = res.tempFilePaths[0]
 					try {
-						const uploadRes = await uploadFile(tempPath)
-						// TODO: 通过腾讯 IM SDK 发送图片消息
-						this.chatMessages.push({
-							type: 'image',
-							content: uploadRes.url || tempPath,
-							isSelf: true,
-							avatar: ''
-						})
+						const msg = await sendImageMessage(this.targetImUserId, tempPath)
+						this.chatMessages.push(formatIMMessage(msg, this.imUserId))
 						this.scrollToBottom()
 					} catch (e) {
 						uni.showToast({ title: '图片发送失败', icon: 'none' })
@@ -343,7 +388,6 @@ export default {
 			})
 		},
 
-		/** 更改跑腿价格 - 打开改价弹窗 */
 		onChangeCommission() {
 			this.showMoreMenu = false
 			this.priceChangeType = 'Commission'
@@ -351,7 +395,6 @@ export default {
 			this.showPriceChangePopup = true
 		},
 
-		/** 更改商品价格 - 打开改价弹窗 */
 		onChangeGoodsPrice() {
 			this.showMoreMenu = false
 			this.priceChangeType = 'GoodsAmount'
@@ -371,10 +414,7 @@ export default {
 
 			const difference = this.priceDifference
 
-			// 单主发起改价且新价格高于原价时，需先支付补缴金额
 			if (this.isOwner && difference > 0) {
-				// TODO: 调用微信支付接口支付补缴金额
-				// 支付成功后再发送改价申请
 				uni.showModal({
 					title: '补缴支付',
 					content: `需补缴 ¥${difference.toFixed(2)}，确认支付后将发送改价申请`,
@@ -392,7 +432,6 @@ export default {
 			this.submittingPriceChange = false
 		},
 
-		/** 执行改价申请提交 */
 		async doSubmitPriceChange(newPrice) {
 			try {
 				const res = await createPriceChange(this.orderId, {
@@ -401,9 +440,26 @@ export default {
 				})
 				this.showPriceChangePopup = false
 
-				// 在聊天列表中添加改价申请消息
 				const changeTypeLabel = this.priceChangeType === 'Commission' ? '跑腿佣金' : '商品总额'
+
+				// 通过 IM 发送自定义消息通知对方
+				if (this.imReady) {
+					const customData = {
+						bizType: 'price-change',
+						priceChangeId: res.id,
+						changeTypeLabel,
+						originalPrice: res.originalPrice.toFixed(2),
+						newPrice: res.newPrice.toFixed(2),
+						difference: res.difference,
+						status: res.status,
+						description: `发起了${changeTypeLabel}改价申请`
+					}
+					await sendCustomMessage(this.targetImUserId, customData)
+				}
+
+				// 本地显示
 				this.chatMessages.push({
+					id: `pc_${res.id}`,
 					type: 'price-change',
 					isSelf: true,
 					priceChangeId: res.id,
@@ -420,110 +476,55 @@ export default {
 			}
 		},
 
-		/** 响应改价申请（同意/拒绝） */
 		async respondPriceChange(priceChangeId, action) {
 			try {
 				const res = await respondPriceChangeApi(this.orderId, priceChangeId, { action })
 
-				// 更新聊天消息中的改价状态
 				const msg = this.chatMessages.find(
 					m => m.type === 'price-change' && m.priceChangeId === priceChangeId
 				)
-				if (msg) {
-					msg.status = res.status
-				}
+				if (msg) msg.status = res.status
 
 				const actionLabel = action === 'Accepted' ? '同意' : '拒绝'
 				const changeTypeLabel = res.changeType === 'Commission' ? '跑腿佣金' : '商品总额'
 
-				// 系统提示消息
 				this.chatMessages.push({
+					id: `sys_${Date.now()}`,
 					type: 'system',
 					content: `您已${actionLabel}${changeTypeLabel}改价`
 				})
 
-				// 同意改价后处理退款/补缴提示
 				if (action === 'Accepted' && res.difference !== 0) {
 					if (res.difference < 0) {
-						// 退款提示
-						const refundAmount = Math.abs(res.difference).toFixed(2)
 						this.chatMessages.push({
+							id: `sys_refund_${Date.now()}`,
 							type: 'system',
-							content: `已退还您${refundAmount}元，请在微信中查看`
+							content: `已退还您${Math.abs(res.difference).toFixed(2)}元，请在微信中查看`
 						})
 					}
-					// 刷新订单信息以获取最新金额
 					await this.loadOrderInfo()
 				}
-
 				this.scrollToBottom()
 			} catch (e) {
 				uni.showToast({ title: e.message || '操作失败', icon: 'none' })
 			}
 		},
 
-		/** 完成订单 */
 		onCompleteOrder() {
 			this.showMoreMenu = false
-			uni.navigateTo({
-				url: `/pages/order/complete-order?id=${this.orderId}`
-			})
+			uni.navigateTo({ url: `/pages/order/complete-order?id=${this.orderId}` })
 		},
 
-		/** 显示电话弹窗 */
-		showPhone() {
-			if (this.isOwner) {
-				this.targetPhone = this.orderInfo.runnerPhone || '暂无'
-			} else {
-				this.targetPhone = this.orderInfo.phone || '暂无'
-			}
-			this.showPhonePopup = true
-		},
-
-		/** 拨打电话 */
-		callPhone() {
-			if (!this.targetPhone || this.targetPhone === '暂无') return
-			uni.makePhoneCall({ phoneNumber: this.targetPhone })
-		},
-
-		/** 复制电话 */
-		copyPhone() {
-			if (!this.targetPhone || this.targetPhone === '暂无') return
-			uni.setClipboardData({
-				data: this.targetPhone,
-				success: () => {
-					uni.showToast({ title: '手机号已复制', icon: 'none' })
-				}
-			})
-			this.showPhonePopup = false
-		},
-
-		/** 跳转订单详情页 */
 		goOrderDetail() {
-			uni.navigateTo({
-				url: `/pages/order/order-detail?id=${this.orderId}`
-			})
+			uni.navigateTo({ url: `/pages/order/order-detail?id=${this.orderId}` })
 		},
 
-		/** 预览图片 */
 		previewImage(url) {
 			uni.previewImage({ urls: [url] })
 		},
 
-		/** 联系客服 */
-		contactService() {
-			// 微信小程序自带客服功能通过 button open-type="contact" 实现
-		},
-
-		/** 格式化订单类型 */
 		formatOrderType(type) {
-			const map = {
-				Pickup: '代取',
-				Delivery: '代送',
-				Help: '万能帮',
-				Purchase: '代购',
-				Food: '美食街'
-			}
+			const map = { Pickup: '代取', Delivery: '代送', Help: '万能帮', Purchase: '代购', Food: '美食街' }
 			return map[type] || type
 		}
 	}
@@ -571,7 +572,6 @@ export default {
 	flex-direction: column;
 	height: 100vh;
 }
-
 .order-bar {
 	display: flex;
 	justify-content: space-between;
@@ -580,49 +580,46 @@ export default {
 	padding: 20rpx 30rpx;
 	flex-shrink: 0;
 }
-
 .order-bar-text {
 	font-size: 26rpx;
 	color: #333333;
 }
-
 .order-bar-link {
 	font-size: 26rpx;
-	color: #007AFF;
+	color: #FFB700;
 }
-
 .chat-body {
 	flex: 1;
 	padding: 20rpx 24rpx;
 	overflow-y: auto;
 }
-
+.loading-history {
+	text-align: center;
+	padding: 16rpx 0;
+	font-size: 24rpx;
+	color: #999;
+}
 .msg-row {
 	display: flex;
 	margin-bottom: 24rpx;
 	align-items: flex-start;
 }
-
 .msg-row.msg-self {
 	flex-direction: row-reverse;
 }
-
 .msg-row.msg-center {
 	justify-content: center;
 }
-
 .msg-avatar {
 	width: 72rpx;
 	height: 72rpx;
 	border-radius: 50%;
 	flex-shrink: 0;
 }
-
 .msg-bubble {
 	max-width: 65%;
 	margin: 0 16rpx;
 }
-
 .msg-text {
 	background-color: #ffffff;
 	padding: 20rpx 24rpx;
@@ -632,17 +629,14 @@ export default {
 	word-break: break-all;
 	display: block;
 }
-
 .msg-self .msg-text {
-	background-color: #007AFF;
+	background-color: #FFB700;
 	color: #ffffff;
 }
-
 .msg-image {
 	max-width: 100%;
 	border-radius: 12rpx;
 }
-
 .msg-system {
 	background-color: #f5f5f5;
 	padding: 12rpx 20rpx;
@@ -652,16 +646,15 @@ export default {
 	text-align: center;
 	max-width: 80%;
 }
-
 .chat-footer {
 	display: flex;
 	align-items: center;
 	background-color: #ffffff;
 	padding: 16rpx 24rpx;
+	padding-bottom: calc(16rpx + env(safe-area-inset-bottom));
 	border-top: 1rpx solid #eeeeee;
 	flex-shrink: 0;
 }
-
 .chat-input {
 	flex: 1;
 	height: 72rpx;
@@ -670,7 +663,6 @@ export default {
 	padding: 0 30rpx;
 	font-size: 28rpx;
 }
-
 .more-btn {
 	width: 72rpx;
 	height: 72rpx;
@@ -680,26 +672,20 @@ export default {
 	margin-left: 16rpx;
 	flex-shrink: 0;
 }
-
 .more-icon {
 	font-size: 48rpx;
 	color: #666666;
 	font-weight: 300;
 }
-
 /* 更多功能菜单 */
 .more-menu-mask {
 	position: fixed;
-	top: 0;
-	left: 0;
-	right: 0;
-	bottom: 0;
+	top: 0; left: 0; right: 0; bottom: 0;
 	background-color: rgba(0, 0, 0, 0.3);
 	z-index: 100;
 	display: flex;
 	align-items: flex-end;
 }
-
 .more-menu {
 	width: 100%;
 	background-color: #ffffff;
@@ -708,7 +694,6 @@ export default {
 	display: flex;
 	flex-wrap: wrap;
 }
-
 .menu-item {
 	width: 25%;
 	display: flex;
@@ -716,17 +701,14 @@ export default {
 	align-items: center;
 	padding: 24rpx 0;
 }
-
 .menu-icon {
 	font-size: 48rpx;
 	margin-bottom: 12rpx;
 }
-
 .menu-label {
 	font-size: 24rpx;
 	color: #666666;
 }
-
 /* 改价消息卡片 */
 .price-change-card {
 	background-color: #ffffff;
@@ -735,121 +717,40 @@ export default {
 	width: 80%;
 	box-shadow: 0 2rpx 12rpx rgba(0, 0, 0, 0.08);
 }
-
-.pc-header {
-	margin-bottom: 16rpx;
-}
-
-.pc-title {
-	font-size: 26rpx;
-	color: #333333;
-	font-weight: 500;
-}
-
-.pc-body {
-	margin-bottom: 16rpx;
-}
-
-.pc-row {
-	display: flex;
-	justify-content: space-between;
-	align-items: center;
-	padding: 8rpx 0;
-}
-
-.pc-label {
-	font-size: 24rpx;
-	color: #999999;
-}
-
-.pc-value {
-	font-size: 26rpx;
-	color: #333333;
-}
-
-.pc-new-price {
-	color: #007AFF;
-	font-weight: 500;
-}
-
-.pc-pay {
-	color: #ff6600;
-}
-
-.pc-refund {
-	color: #52c41a;
-}
-
-.pc-actions {
-	display: flex;
-	gap: 16rpx;
-}
-
-.pc-btn {
-	flex: 1;
-	padding: 16rpx 0;
-	border-radius: 8rpx;
-	text-align: center;
-	font-size: 26rpx;
-}
-
-.pc-accept {
-	background-color: #007AFF;
-	color: #ffffff;
-}
-
-.pc-reject {
-	background-color: #f5f5f5;
-	color: #666666;
-}
-
-.pc-waiting {
-	text-align: center;
-	padding: 12rpx 0;
-}
-
-.pc-waiting text {
-	font-size: 24rpx;
-	color: #ff9900;
-}
-
-.pc-result {
-	text-align: center;
-	padding: 12rpx 0;
-}
-
-.pc-accepted {
-	font-size: 24rpx;
-	color: #52c41a;
-}
-
-.pc-rejected {
-	font-size: 24rpx;
-	color: #ff4d4f;
-}
-
-/* 弹窗通用样式 */
+.pc-header { margin-bottom: 16rpx; }
+.pc-title { font-size: 26rpx; color: #333333; font-weight: 500; }
+.pc-body { margin-bottom: 16rpx; }
+.pc-row { display: flex; justify-content: space-between; align-items: center; padding: 8rpx 0; }
+.pc-label { font-size: 24rpx; color: #999999; }
+.pc-value { font-size: 26rpx; color: #333333; }
+.pc-new-price { color: #FFB700; font-weight: 500; }
+.pc-pay { color: #ff6600; }
+.pc-refund { color: #52c41a; }
+.pc-actions { display: flex; gap: 16rpx; }
+.pc-btn { flex: 1; padding: 16rpx 0; border-radius: 8rpx; text-align: center; font-size: 26rpx; }
+.pc-accept { background-color: #FFB700; color: #ffffff; }
+.pc-reject { background-color: #f5f5f5; color: #666666; }
+.pc-waiting { text-align: center; padding: 12rpx 0; }
+.pc-waiting text { font-size: 24rpx; color: #ff9900; }
+.pc-result { text-align: center; padding: 12rpx 0; }
+.pc-accepted { font-size: 24rpx; color: #52c41a; }
+.pc-rejected { font-size: 24rpx; color: #ff4d4f; }
+/* 弹窗 */
 .popup-mask {
 	position: fixed;
-	top: 0;
-	left: 0;
-	right: 0;
-	bottom: 0;
+	top: 0; left: 0; right: 0; bottom: 0;
 	background-color: rgba(0, 0, 0, 0.5);
 	z-index: 200;
 	display: flex;
 	align-items: center;
 	justify-content: center;
 }
-
-/* 改价弹窗 */
 .popup-content {
 	width: 80%;
 	background-color: #ffffff;
 	border-radius: 20rpx;
 	padding: 40rpx;
 }
-
 .popup-title {
 	font-size: 32rpx;
 	color: #333333;
@@ -858,7 +759,6 @@ export default {
 	text-align: center;
 	margin-bottom: 30rpx;
 }
-
 .popup-field {
 	display: flex;
 	justify-content: space-between;
@@ -866,17 +766,8 @@ export default {
 	padding: 20rpx 0;
 	border-bottom: 1rpx solid #f0f0f0;
 }
-
-.popup-label {
-	font-size: 28rpx;
-	color: #666666;
-}
-
-.popup-current-price {
-	font-size: 28rpx;
-	color: #333333;
-}
-
+.popup-label { font-size: 28rpx; color: #666666; }
+.popup-current-price { font-size: 28rpx; color: #333333; }
 .popup-input {
 	width: 50%;
 	height: 64rpx;
@@ -886,92 +777,10 @@ export default {
 	font-size: 28rpx;
 	text-align: right;
 }
-
-.popup-diff {
-	padding: 16rpx 0;
-	text-align: center;
-}
-
-.popup-diff text {
-	font-size: 24rpx;
-}
-
-.popup-actions {
-	display: flex;
-	gap: 20rpx;
-	margin-top: 30rpx;
-}
-
-.popup-btn {
-	flex: 1;
-	padding: 20rpx 0;
-	border-radius: 12rpx;
-	text-align: center;
-	font-size: 28rpx;
-}
-
-.popup-cancel {
-	background-color: #f5f5f5;
-	color: #666666;
-}
-
-.popup-confirm {
-	background-color: #007AFF;
-	color: #ffffff;
-}
-
-/* 电话弹窗 */
-.phone-popup {
-	width: 70%;
-	background-color: #ffffff;
-	border-radius: 20rpx;
-	padding: 40rpx;
-	text-align: center;
-}
-
-.phone-title {
-	font-size: 30rpx;
-	color: #333333;
-	font-weight: 500;
-	display: block;
-	margin-bottom: 20rpx;
-}
-
-.phone-number {
-	font-size: 40rpx;
-	color: #007AFF;
-	font-weight: bold;
-	display: block;
-	margin-bottom: 40rpx;
-}
-
-.phone-actions {
-	display: flex;
-	gap: 20rpx;
-	margin-bottom: 20rpx;
-}
-
-.phone-btn {
-	flex: 1;
-	padding: 20rpx 0;
-	border-radius: 12rpx;
-	text-align: center;
-	font-size: 28rpx;
-}
-
-.call-btn {
-	background-color: #007AFF;
-	color: #ffffff;
-}
-
-.copy-btn {
-	background-color: #f5f5f5;
-	color: #333333;
-}
-
-.phone-cancel {
-	padding: 16rpx 0;
-	font-size: 28rpx;
-	color: #999999;
-}
+.popup-diff { padding: 16rpx 0; text-align: center; }
+.popup-diff text { font-size: 24rpx; }
+.popup-actions { display: flex; gap: 20rpx; margin-top: 30rpx; }
+.popup-btn { flex: 1; padding: 20rpx 0; border-radius: 12rpx; text-align: center; font-size: 28rpx; }
+.popup-cancel { background-color: #f5f5f5; color: #666666; }
+.popup-confirm { background-color: #FAD146; color: #ffffff; }
 </style>
diff --git a/miniapp/pages/message/order-notify.vue b/miniapp/pages/message/order-notify.vue
index b1966da..b02986d 100644
--- a/miniapp/pages/message/order-notify.vue
+++ b/miniapp/pages/message/order-notify.vue
@@ -193,9 +193,9 @@ export default {
 }
 
 .tab-item.active {
-	color: #007AFF;
+	color: #FFB700;
 	font-weight: 500;
-	background-color: #e8f4fd;
+	background-color: #fff8e6;
 }
 
 .notify-item {
@@ -220,8 +220,8 @@ export default {
 
 .notify-type {
 	font-size: 24rpx;
-	color: #007AFF;
-	background-color: #e8f4fd;
+	color: #FFB700;
+	background-color: #fff8e6;
 	padding: 4rpx 16rpx;
 	border-radius: 8rpx;
 }
@@ -255,7 +255,7 @@ export default {
 }
 
 .notify-btn {
-	background-color: #007AFF;
+	background-color: #FFB700;
 	border-radius: 8rpx;
 	padding: 8rpx 24rpx;
 }
diff --git a/miniapp/pages/mine/earnings-record.vue b/miniapp/pages/mine/earnings-record.vue
index b66bed6..32e0753 100644
--- a/miniapp/pages/mine/earnings-record.vue
+++ b/miniapp/pages/mine/earnings-record.vue
@@ -162,7 +162,7 @@ export default {
 .record-type {
 	font-size: 26rpx;
 	color: #ffffff;
-	background-color: #007AFF;
+	background-color: #FFB700;
 	padding: 4rpx 16rpx;
 	border-radius: 8rpx;
 }
diff --git a/miniapp/pages/mine/earnings.vue b/miniapp/pages/mine/earnings.vue
index f54d291..8c9c0c9 100644
--- a/miniapp/pages/mine/earnings.vue
+++ b/miniapp/pages/mine/earnings.vue
@@ -333,7 +333,7 @@ export default {
 
 /* 金额状态区域 */
 .amount-section {
-	background-color: #007AFF;
+	background-color: #FFB700;
 	padding: 40rpx 24rpx 50rpx;
 }
 
@@ -388,7 +388,7 @@ export default {
 }
 
 .action-btn.primary text {
-	color: #007AFF;
+	color: #FFB700;
 	font-weight: 500;
 }
 
@@ -409,7 +409,7 @@ export default {
 
 .guide-link text {
 	font-size: 26rpx;
-	color: #007AFF;
+	color: #FFB700;
 }
 
 /* 提现记录 */
@@ -488,7 +488,7 @@ export default {
 }
 
 .ws-pending { color: #faad14; }
-.ws-processing { color: #007AFF; }
+.ws-processing { color: #FFB700; }
 .ws-done { color: #52c41a; }
 
 /* 弹窗通用 */
@@ -569,8 +569,8 @@ export default {
 }
 
 .payment-option.active {
-	border-color: #007AFF;
-	background-color: rgba(0, 122, 255, 0.05);
+	border-color: #FFB700;
+	background-color: rgba(255, 183, 0, 0.05);
 }
 
 .payment-option text {
@@ -579,7 +579,7 @@ export default {
 }
 
 .payment-option.active text {
-	color: #007AFF;
+	color: #FFB700;
 }
 
 .upload-area {
@@ -623,8 +623,12 @@ export default {
 	color: #666666;
 }
 
+.modal-btn.cancel::after {
+	border: none;
+}
+
 .modal-btn.confirm {
-	background-color: #007AFF;
+	background-color: #FAD146;
 	color: #ffffff;
 }
 
diff --git a/miniapp/pages/mine/mine.vue b/miniapp/pages/mine/mine.vue
index 7933dcb..b0a0dd2 100644
--- a/miniapp/pages/mine/mine.vue
+++ b/miniapp/pages/mine/mine.vue
@@ -183,7 +183,7 @@ export default {
 
 /* 顶部渐变背景 */
 .header-bg {
-	background: linear-gradient(180deg, #FFB700 0%, #FFD59B 100%);
+	background: linear-gradient(90deg, #FFB700 0%, #FFD59B 100%);
 }
 
 .nav-bar {
diff --git a/miniapp/pages/order-hall/order-hall.vue b/miniapp/pages/order-hall/order-hall.vue
index 88e06b6..5960b9c 100644
--- a/miniapp/pages/order-hall/order-hall.vue
+++ b/miniapp/pages/order-hall/order-hall.vue
@@ -227,6 +227,8 @@
 		onShow() {
 			const sysInfo = uni.getSystemInfoSync()
 			this.statusBarHeight = sysInfo.statusBarHeight || 0
+			// 重置认证状态缓存，确保每次进入页面重新获取
+			this.certStatus = null
 			this.loadBanner()
 			this.loadOrders()
 		},
diff --git a/miniapp/pages/runner/certification.vue b/miniapp/pages/runner/certification.vue
index 0841d82..a1246b2 100644
--- a/miniapp/pages/runner/certification.vue
+++ b/miniapp/pages/runner/certification.vue
@@ -231,7 +231,7 @@ export default {
 }
 
 .submit-btn {
-	background-color: #007AFF;
+	background-color: #FAD146;
 	color: #ffffff;
 	text-align: center;
 	padding: 24rpx 0;
diff --git a/miniapp/stores/user.js b/miniapp/stores/user.js
index fb83012..0388f63 100644
--- a/miniapp/stores/user.js
+++ b/miniapp/stores/user.js
@@ -5,6 +5,7 @@
 import { defineStore } from 'pinia'
 import { ref, computed } from 'vue'
 import { clearAuth } from '../utils/request'
+import { logoutIM } from '../utils/im'
 
 export const useUserStore = defineStore('user', () => {
 	// 状态
@@ -34,6 +35,7 @@ export const useUserStore = defineStore('user', () => {
 		token.value = ''
 		userInfo.value = {}
 		clearAuth()
+		logoutIM().catch(() => {})
 		uni.reLaunch({ url: '/pages/index/index' })
 	}
 
diff --git a/miniapp/utils/api.js b/miniapp/utils/api.js
index 48779bb..8e60445 100644
--- a/miniapp/utils/api.js
+++ b/miniapp/utils/api.js
@@ -201,3 +201,10 @@ export function getWithdrawalGuide() {
 export function getPageBanner(page) {
 	return request({ url: `/api/config/page-banner/${page}` })
 }
+
+// ==================== 腾讯 IM ====================
+
+/** 获取 IM UserSig */
+export function getIMUserSig() {
+	return request({ url: '/api/im/usersig' })
+}
diff --git a/miniapp/utils/im.js b/miniapp/utils/im.js
new file mode 100644
index 0000000..5bdc182
--- /dev/null
+++ b/miniapp/utils/im.js
@@ -0,0 +1,238 @@
+/**
+ * 腾讯 IM SDK 封装
+ * 负责初始化、登录、收发消息
+ */
+import TencentCloudChat from '@tencentcloud/chat'
+import request from './request'
+
+let chat = null
+let isReady = false
+let onMessageCallback = null
+
+/**
+ * 获取 IM 实例（单例）
+ */
+export function getChatInstance() {
+	return chat
+}
+
+/**
+ * 初始化并登录 IM
+ * @returns {Promise<{sdkAppId, userId}>}
+ */
+export async function initIM() {
+	// 从后端获取 UserSig
+	const res = await request({ url: '/api/im/usersig' })
+	const { sdkAppId, userId, userSig } = res
+
+	// 创建 SDK 实例
+	if (!chat) {
+		chat = TencentCloudChat.create({ SDKAppID: sdkAppId })
+		chat.setLogLevel(1) // Release 级别日志
+
+		// 监听 SDK 就绪
+		chat.on(TencentCloudChat.EVENT.SDK_READY, () => {
+			console.log('[IM] SDK 就绪')
+			isReady = true
+		})
+
+		// 监听新消息
+		chat.on(TencentCloudChat.EVENT.MESSAGE_RECEIVED, (event) => {
+			const msgList = event.data
+			if (onMessageCallback) {
+				onMessageCallback(msgList)
+			}
+		})
+
+		// 监听被踢下线
+		chat.on(TencentCloudChat.EVENT.KICKED_OUT, () => {
+			console.log('[IM] 被踢下线')
+			isReady = false
+		})
+	}
+
+	// 登录
+	await chat.login({ userID: userId, userSig })
+	console.log('[IM] 登录成功:', userId)
+	return { sdkAppId, userId }
+}
+
+/**
+ * 登出 IM
+ */
+export async function logoutIM() {
+	if (chat) {
+		await chat.logout()
+		isReady = false
+		console.log('[IM] 已登出')
+	}
+}
+
+/**
+ * 设置新消息回调
+ * @param {Function} callback - 接收消息列表的回调
+ */
+export function onNewMessage(callback) {
+	onMessageCallback = callback
+}
+
+/**
+ * 移除新消息回调
+ */
+export function offNewMessage() {
+	onMessageCallback = null
+}
+
+/**
+ * 获取会话 ID（C2C 单聊）
+ * @param {string} targetUserId - 对方用户 ID（如 user_123）
+ */
+export function getConversationId(targetUserId) {
+	return `C2C${targetUserId}`
+}
+
+/**
+ * 拉取历史消息
+ * @param {string} targetUserId - 对方用户 ID
+ * @param {string} [nextReqMessageID] - 分页标记
+ * @returns {Promise<{messageList, isCompleted, nextReqMessageID}>}
+ */
+export async function getMessageList(targetUserId, nextReqMessageID) {
+	const conversationID = getConversationId(targetUserId)
+	const res = await chat.getMessageList({
+		conversationID,
+		nextReqMessageID,
+		count: 20
+	})
+	return {
+		messageList: res.data.messageList || [],
+		isCompleted: res.data.isCompleted,
+		nextReqMessageID: res.data.nextReqMessageID
+	}
+}
+
+/**
+ * 发送文本消息
+ * @param {string} targetUserId - 对方用户 ID
+ * @param {string} text - 文本内容
+ */
+export async function sendTextMessage(targetUserId, text) {
+	const message = chat.createTextMessage({
+		to: targetUserId,
+		conversationType: TencentCloudChat.TYPES.CONV_C2C,
+		payload: { text }
+	})
+	const res = await chat.sendMessage(message)
+	return res.data.message
+}
+
+/**
+ * 发送图片消息
+ * @param {string} targetUserId - 对方用户 ID
+ * @param {string} filePath - 本地图片路径
+ */
+export async function sendImageMessage(targetUserId, filePath) {
+	const message = chat.createImageMessage({
+		to: targetUserId,
+		conversationType: TencentCloudChat.TYPES.CONV_C2C,
+		payload: { file: { tempFilePaths: [filePath] } }
+	})
+	const res = await chat.sendMessage(message)
+	return res.data.message
+}
+
+/**
+ * 发送自定义消息（改价申请等）
+ * @param {string} targetUserId - 对方用户 ID
+ * @param {Object} customData - 自定义数据
+ */
+export async function sendCustomMessage(targetUserId, customData) {
+	const message = chat.createCustomMessage({
+		to: targetUserId,
+		conversationType: TencentCloudChat.TYPES.CONV_C2C,
+		payload: {
+			data: JSON.stringify(customData),
+			description: customData.description || '',
+			extension: customData.extension || ''
+		}
+	})
+	const res = await chat.sendMessage(message)
+	return res.data.message
+}
+
+/**
+ * 将 IM 消息转换为聊天页展示格式
+ * @param {Object} msg - IM SDK 消息对象
+ * @param {string} currentImUserId - 当前用户 IM ID
+ * @returns {Object} 聊天页消息格式
+ */
+export function formatIMMessage(msg, currentImUserId) {
+	const isSelf = msg.from === currentImUserId
+	const avatar = msg.avatar || '/static/logo.png'
+
+	// 文本消息
+	if (msg.type === TencentCloudChat.TYPES.MSG_TEXT) {
+		return {
+			id: msg.ID,
+			type: 'text',
+			content: msg.payload.text,
+			isSelf,
+			avatar,
+			time: msg.time * 1000
+		}
+	}
+
+	// 图片消息
+	if (msg.type === TencentCloudChat.TYPES.MSG_IMAGE) {
+		const imageInfo = msg.payload.imageInfoArray?.[1] || msg.payload.imageInfoArray?.[0]
+		return {
+			id: msg.ID,
+			type: 'image',
+			content: imageInfo?.url || '',
+			isSelf,
+			avatar,
+			time: msg.time * 1000
+		}
+	}
+
+	// 自定义消息（改价等）
+	if (msg.type === TencentCloudChat.TYPES.MSG_CUSTOM) {
+		try {
+			const data = JSON.parse(msg.payload.data)
+			if (data.bizType === 'price-change') {
+				return {
+					id: msg.ID,
+					type: 'price-change',
+					isSelf,
+					priceChangeId: data.priceChangeId,
+					changeTypeLabel: data.changeTypeLabel,
+					originalPrice: data.originalPrice,
+					newPrice: data.newPrice,
+					difference: data.difference,
+					status: data.status,
+					time: msg.time * 1000
+				}
+			}
+		} catch (e) {
+			// 解析失败当普通文本处理
+		}
+		return {
+			id: msg.ID,
+			type: 'text',
+			content: msg.payload.description || '[自定义消息]',
+			isSelf,
+			avatar,
+			time: msg.time * 1000
+		}
+	}
+
+	// 其他类型
+	return {
+		id: msg.ID,
+		type: 'text',
+		content: '[暂不支持的消息类型]',
+		isSelf,
+		avatar,
+		time: msg.time * 1000
+	}
+}
diff --git a/server/Program.cs b/server/Program.cs
index 1e9a70a..cb04651 100644
--- a/server/Program.cs
+++ b/server/Program.cs
@@ -67,6 +67,9 @@ builder.Services.AddSingleton<JwtService>();
 // 注册微信服务
 builder.Services.AddHttpClient<IWeChatService, WeChatService>();
 
+// 注册腾讯 IM 服务
+builder.Services.AddSingleton<TencentIMService>();
+
 // OpenAPI 文档（.NET 10 内置）
 builder.Services.AddOpenApi();
 
@@ -205,6 +208,24 @@ app.MapPost("/api/auth/wx-login", async (
 app.MapGet("/api/protected", () => Results.Ok("ok"))
     .RequireAuthorization();
 
+// ========== 腾讯 IM 接口 ==========
+
+// 获取 IM UserSig（登录后调用）
+app.MapGet("/api/im/usersig", (
+    HttpContext context,
+    TencentIMService imService) =>
+{
+    var userId = int.Parse(context.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)!.Value);
+    var imUserId = $"user_{userId}";
+    var userSig = imService.GenerateUserSig(imUserId);
+    return Results.Ok(new
+    {
+        sdkAppId = imService.SDKAppId,
+        userId = imUserId,
+        userSig
+    });
+}).RequireAuthorization();
+
 app.MapGet("/api/admin/protected", () => Results.Ok("admin ok"))
     .RequireAuthorization("AdminOnly");
 
diff --git a/server/Services/TencentIMService.cs b/server/Services/TencentIMService.cs
new file mode 100644
index 0000000..c92647e
--- /dev/null
+++ b/server/Services/TencentIMService.cs
@@ -0,0 +1,61 @@
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+namespace CampusErrand.Services;
+
+/// <summary>
+/// 腾讯 IM 服务，负责生成 UserSig
+/// </summary>
+public class TencentIMService
+{
+    private readonly long _sdkAppId;
+    private readonly string _secretKey;
+
+    public TencentIMService(IConfiguration configuration)
+    {
+        var config = configuration.GetSection("TencentIM");
+        _sdkAppId = config.GetValue<long>("SDKAppId");
+        _secretKey = config["SecretKey"]!;
+    }
+
+    public long SDKAppId => _sdkAppId;
+
+    /// <summary>
+    /// 生成 UserSig
+    /// </summary>
+    /// <param name="userId">用户标识</param>
+    /// <param name="expireSeconds">有效期（秒），默认7天</param>
+    public string GenerateUserSig(string userId, int expireSeconds = 604800)
+    {
+        var now = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
+        var obj = new Dictionary<string, object>
+        {
+            ["TLS.ver"] = "2.0",
+            ["TLS.identifier"] = userId,
+            ["TLS.sdkappid"] = _sdkAppId,
+            ["TLS.expire"] = expireSeconds,
+            ["TLS.time"] = now
+        };
+
+        var contentToSign = $"TLS.identifier:{userId}\nTLS.sdkappid:{_sdkAppId}\nTLS.time:{now}\nTLS.expire:{expireSeconds}\n";
+        using var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(_secretKey));
+        var sig = hmac.ComputeHash(Encoding.UTF8.GetBytes(contentToSign));
+        obj["TLS.sig"] = Convert.ToBase64String(sig);
+
+        var jsonBytes = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(obj));
+
+        // zlib 压缩
+        using var output = new MemoryStream();
+        using (var zlib = new System.IO.Compression.ZLibStream(output, System.IO.Compression.CompressionLevel.Optimal))
+        {
+            zlib.Write(jsonBytes, 0, jsonBytes.Length);
+        }
+
+        // Base64 URL 安全编码
+        return Convert.ToBase64String(output.ToArray())
+            .Replace('+', '*')
+            .Replace('/', '-')
+            .Replace('=', '_');
+    }
+}
diff --git a/server/appsettings.json b/server/appsettings.json
index 7a7eaed..3fd7c3d 100644
--- a/server/appsettings.json
+++ b/server/appsettings.json
@@ -19,13 +19,17 @@
     "ExpireMinutes": 10080
   },
   "WeChat": {
-    "AppId": "wx626fd4a47944e3ea",
-    "AppSecret": "352b4f8238e43df92d5131ba31e6f33d"
+    "AppId": "wxd62aec23fcb79bc6",
+    "AppSecret": "2b3b9d15fee1ed3e6204d67c86facfaf"
   },
   "Upload": {
     "MaxFileSizeBytes": 5242880,
     "AllowedExtensions": [ ".jpg", ".jpeg", ".png", ".gif", ".webp" ]
   },
+  "TencentIM": {
+    "SDKAppId": 1600132027,
+    "SecretKey": "321c66ac633842b2f9c318739e58508260930c289c0ea790a2d66b544ac83dfa"
+  },
   "COS": {
     "SecretId": "AKIDPioO4YovwtfMrwrYJq8CNN9qT4c0IyQd",
     "SecretKey": "1nLfLp44pOxUsKe1AmS8gFoBLH0Vloco",