diff --git a/apps/mini-user/src/components/ContactCsButton.tsx b/apps/mini-user/src/components/ContactCsButton.tsx
new file mode 100644
index 0000000..f1dfab7
--- /dev/null
+++ b/apps/mini-user/src/components/ContactCsButton.tsx
@@ -0,0 +1,50 @@
+import { Button, Text } from '@tarojs/components';
+import type { ReactNode } from 'react';
+
+export type ContactCsSessionContext = {
+  orderId?: string;
+  orderNo?: string;
+  from?: string;
+};
+
+type ContactCsButtonProps = {
+  className?: string;
+  children?: ReactNode;
+  /** 客服会话来源上下文，便于客服后台识别 */
+  session?: ContactCsSessionContext;
+};
+
+const isWeapp = process.env.TARO_ENV === 'weapp';
+
+/** 组装 session-from（微信限制约 1000 字符） */
+export function buildCsSessionFrom(session?: ContactCsSessionContext): string {
+  if (!session) return 'dukang|from=mini-user';
+  const parts = ['dukang'];
+  if (session.from) parts.push(`from=${session.from}`);
+  if (session.orderNo) parts.push(`orderNo=${session.orderNo}`);
+  if (session.orderId) parts.push(`orderId=${session.orderId}`);
+  return parts.join('|');
+}
+
+/**
+ * 微信小程序客服入口（open-type=contact）。
+ * 非 weapp 环境不渲染，由调用方走电话等兜底。
+ */
+export default function ContactCsButton({
+  className = '',
+  children = '联系在线客服',
+  session,
+}: ContactCsButtonProps) {
+  if (!isWeapp) return null;
+
+  return (
+    <Button
+      className={className}
+      openType="contact"
+      sessionFrom={buildCsSessionFrom(session)}
+      hoverClass="none"
+    >
+      {typeof children === 'string' ? <Text>{children}</Text> : children}
+    </Button>
+  );
+}
diff --git a/apps/mini-user/src/pages/customer-service/index.tsx b/apps/mini-user/src/pages/customer-service/index.tsx
index 39208be..fe448fd 100644
--- a/apps/mini-user/src/pages/customer-service/index.tsx
+++ b/apps/mini-user/src/pages/customer-service/index.tsx
@@ -3,28 +3,42 @@ import Taro from '@tarojs/taro';
 import { CUSTOMER_SERVICE_PHONE } from '@dukang/shared-types';
 import PageShell from '../../components/PageShell';
 import SubPageHeader from '../../components/SubPageHeader';
+import ContactCsButton from '../../components/ContactCsButton';
 import { toast } from '../../lib/api';
 
+const isWeapp = process.env.TARO_ENV === 'weapp';
 const DIAL_PHONE = CUSTOMER_SERVICE_PHONE.replace(/-/g, '');
 
+function dialPhone() {
+  Taro.makePhoneCall({ phoneNumber: DIAL_PHONE }).catch(() => toast('无法拨打电话'));
+}
+
 export default function CustomerServicePage() {
   return (
     <PageShell variant="sub" className="cs-page">
       <SubPageHeader title="联系客服" />
       <View className="sub-page-body inset-page cs-body">
-        <Text className="cs-title">客服热线</Text>
-        <Text className="cs-phone">{CUSTOMER_SERVICE_PHONE}</Text>
-        <Text className="cs-hint">工作时间：9:00 - 21:00</Text>
-        <View
-          className="cs-call-btn"
-          onClick={() => {
-            Taro.makePhoneCall({ phoneNumber: DIAL_PHONE }).catch(() =>
-              toast('无法拨打电话'),
-            );
-          }}
-        >
-          <Text>拨打客服电话</Text>
+        <Text className="cs-brand">杜康好客客服</Text>
+        <Text className="cs-hint">
+          {isWeapp
+            ? '点击下方按钮，进入小程序在线客服会话'
+            : '请在微信小程序内打开以使用在线客服，或拨打客服电话'}
+        </Text>
+        <Text className="cs-hours">工作时间：9:00 - 21:00</Text>
+
+        {isWeapp ? (
+          <ContactCsButton className="cs-online-btn" session={{ from: 'customer-service' }} />
+        ) : null}
+
+        <View className={isWeapp ? 'cs-phone-link' : 'cs-call-btn'} onClick={dialPhone}>
+          <Text>
+            {isWeapp ? `或拨打客服电话 ${CUSTOMER_SERVICE_PHONE}` : '拨打客服电话'}
+          </Text>
         </View>
+
+        {!isWeapp ? (
+          <Text className="cs-phone-display">{CUSTOMER_SERVICE_PHONE}</Text>
+        ) : null}
       </View>
     </PageShell>
   );
diff --git a/apps/mini-user/src/pages/order-detail/index.tsx b/apps/mini-user/src/pages/order-detail/index.tsx
index 808fa63..47393a8 100644
--- a/apps/mini-user/src/pages/order-detail/index.tsx
+++ b/apps/mini-user/src/pages/order-detail/index.tsx
@@ -5,6 +5,7 @@ import PageShell from '../../components/PageShell';
 import SubPageHeader from '../../components/SubPageHeader';
 import ShareNavButton from '../../components/ShareNavButton';
 import WechatShareReady from '../../components/WechatShareReady';
+import ContactCsButton from '../../components/ContactCsButton';
 import { request, toast } from '../../lib/api';
 import { buildPayUrl } from '../../lib/checkout-nav';
 import { maskPhone } from '../../lib/phone';
@@ -14,6 +15,8 @@ import {
   toWeappShareMessage,
 } from '../../lib/wechat-share';
 
+const isWeapp = process.env.TARO_ENV === 'weapp';
+
 type OrderItem = {
   productName?: string;
   productSpec?: string;
@@ -104,8 +107,20 @@ export default function OrderDetailPage() {
     Taro.navigateTo({ url: buildPayUrl({ orderId: order.id }) });
   }
 
+  function goCustomerService() {
+    Taro.navigateTo({ url: '/pages/customer-service/index' });
+  }
+
+  const pageClass = [
+    'order-detail-page',
+    order ? 'order-detail-page--with-actions' : '',
+    canPay ? 'order-detail-page--with-pay' : '',
+  ]
+    .filter(Boolean)
+    .join(' ');
+
   return (
-    <PageShell variant="sub" className={`order-detail-page${canPay ? ' order-detail-page--with-pay' : ''}`}>
+    <PageShell variant="sub" className={pageClass}>
       <WechatShareReady payload={sharePayload} />
       <SubPageHeader
         title="订单详情"
@@ -173,19 +188,39 @@ export default function OrderDetailPage() {
         )}
       </View>
 
-      {canPay && order && (
-        <View className="pay-bar order-detail-pay-bar">
-          <View className="order-confirm-total">
-            <Text className="order-confirm-total-label">待支付</Text>
-            <Text className="order-confirm-total-value">
-              ¥{Number(order.payAmount ?? 0).toFixed(2)}
-            </Text>
-          </View>
-          <View className="order-confirm-submit" onClick={goPay}>
-            去付款
-          </View>
+      {order ? (
+        <View className={`order-detail-actionbar${canPay ? ' order-detail-actionbar--with-pay' : ''}`}>
+          {isWeapp ? (
+            <ContactCsButton
+              className="order-detail-cs-btn"
+              session={{
+                from: 'order-detail',
+                orderId: order.id,
+                orderNo: order.orderNo,
+              }}
+            >
+              联系客服
+            </ContactCsButton>
+          ) : (
+            <View className="order-detail-cs-btn" onClick={goCustomerService}>
+              <Text>联系客服</Text>
+            </View>
+          )}
+          {canPay ? (
+            <>
+              <View className="order-confirm-total">
+                <Text className="order-confirm-total-label">待支付</Text>
+                <Text className="order-confirm-total-value">
+                  ¥{Number(order.payAmount ?? 0).toFixed(2)}
+                </Text>
+              </View>
+              <View className="order-confirm-submit" onClick={goPay}>
+                去付款
+              </View>
+            </>
+          ) : null}
         </View>
-      )}
+      ) : null}
     </PageShell>
   );
 }
diff --git a/apps/mini-user/src/styles/order.css b/apps/mini-user/src/styles/order.css
index 4f64095..6d4432d 100644
--- a/apps/mini-user/src/styles/order.css
+++ b/apps/mini-user/src/styles/order.css
@@ -7,7 +7,8 @@
   min-height: 100vh;
 }
 
-.order-detail-page--with-pay .sub-page-body {
+.order-detail-page--with-pay .sub-page-body,
+.order-detail-page--with-actions .sub-page-body {
   padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
 }
 
@@ -16,6 +17,57 @@
   gap: 12px;
 }
 
+.order-detail-actionbar {
+  position: fixed;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  z-index: 50;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 10px var(--space-page) calc(10px + env(safe-area-inset-bottom, 0px));
+  background: var(--color-card, #fff);
+  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.06);
+  box-sizing: border-box;
+}
+
+.order-detail-actionbar--with-pay {
+  justify-content: space-between;
+}
+
+.order-detail-cs-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  min-width: 96px;
+  height: 40px;
+  padding: 0 14px;
+  margin: 0;
+  border: 1px solid var(--color-outline, #c8c4be);
+  border-radius: 999px;
+  background: transparent;
+  color: var(--color-on-surface);
+  font-size: 14px;
+  font-weight: 600;
+  line-height: 1.2;
+  box-sizing: border-box;
+}
+
+.order-detail-cs-btn::after {
+  border: none;
+}
+
+.order-detail-actionbar .order-confirm-total {
+  flex: 1;
+  min-width: 0;
+}
+
+.order-detail-actionbar .order-confirm-submit {
+  flex-shrink: 0;
+}
+
 .order-card {
   background: var(--color-card);
   border-radius: var(--radius-lg);
diff --git a/apps/mini-user/src/styles/redeem.css b/apps/mini-user/src/styles/redeem.css
index bd2fe36..63a62a5 100644
--- a/apps/mini-user/src/styles/redeem.css
+++ b/apps/mini-user/src/styles/redeem.css
@@ -499,27 +499,70 @@
   text-align: center;
 }
 
+.cs-brand {
+  display: block;
+  font-family: var(--font-headline);
+  font-size: 22px;
+  font-weight: 700;
+  color: var(--color-on-surface);
+  margin-bottom: 10px;
+}
+
 .cs-title {
   font-size: 14px;
   color: var(--color-subtle-gray);
   margin-bottom: 12px;
 }
 
-.cs-phone {
+.cs-phone,
+.cs-phone-display {
+  display: block;
   font-family: var(--font-headline);
-  font-size: 32px;
+  font-size: 28px;
   font-weight: 700;
   color: var(--color-heritage-red);
-  margin-bottom: 8px;
+  margin-top: 20px;
   letter-spacing: 1px;
 }
 
 .cs-hint {
+  display: block;
+  font-size: 14px;
+  color: var(--color-subtle-gray);
+  line-height: 1.5;
+  margin-bottom: 8px;
+  max-width: 280px;
+}
+
+.cs-hours {
+  display: block;
   font-size: 12px;
   color: var(--color-subtle-gray);
   margin-bottom: 32px;
 }
 
+.cs-online-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  max-width: 280px;
+  padding: 14px 24px;
+  margin: 0;
+  border: none;
+  border-radius: 999px;
+  background: var(--color-heritage-red);
+  color: #fff;
+  font-size: 15px;
+  font-weight: 600;
+  line-height: 1.4;
+  box-sizing: border-box;
+}
+
+.cs-online-btn::after {
+  border: none;
+}
+
 .cs-call-btn {
   padding: 12px 32px;
   border-radius: 999px;
@@ -528,3 +571,12 @@
   font-size: 15px;
   font-weight: 600;
 }
+
+.cs-phone-link {
+  margin-top: 20px;
+  padding: 8px 12px;
+  font-size: 13px;
+  color: var(--color-subtle-gray);
+  text-decoration: underline;
+  text-underline-offset: 3px;
+}