调整用户中心页面内容区域的顶部边距，并优化返回按钮的样式和定位。

web1/src/views/user-center/components/CorporateTransfer.vue

@@ -239,7 +239,7 @@ defineExpose({
   padding: 24px;
   min-height: calc(100vh - 40px);
   position: relative;
-  margin-top: 50px;
+
 }
 
 .transfer-container {

web1/src/views/user-center/components/InvoiceManagement.vue

@@ -63,7 +63,7 @@ function handleDeleteInvoice(invoice) {
   padding: 24px;
   min-height: calc(100vh - 40px);
   position: relative;
-  margin-top: 50px;
+
 }
 
 .invoice-container {

web1/src/views/user-center/components/ValuationHistory.vue

@@ -82,7 +82,7 @@ function handleDownloadCertificate(item) {
   padding: 24px;
   min-height: calc(100vh - 40px);
   position: relative;
-  margin-top: 50px;
+
 }
 
 .asset-grid {

web1/src/views/user-center/index.vue

@@ -35,7 +35,7 @@ import { useRouter, useRoute } from 'vue-router'
 import api from '@/api'
 import UserSidebar from './components/UserSidebar.vue'
 
-const router = useRouter()
+const router = useRouter() 
 const route = useRoute()
 
 // 当前菜单（从路由路径计算）
@@ -192,23 +192,22 @@ onMounted(() => {
 
 .back-button {
   position: absolute;
-  top: 20px;
-  left: 20px;
-  display: flex;
+  top: 44px; /* Align with the content card's top padding area */
+  left: 44px; /* Align with the content card's left padding area */
+  display: inline-flex;
   align-items: center;
-  gap: 6px;
-  padding: 8px 16px;
+  gap: 4px;
+  padding: 0;
   color: #606266;
   cursor: pointer;
-  border-radius: 4px;
   transition: all 0.3s ease;
   font-size: 14px;
-  background: white;
+  background: transparent;
   z-index: 10;
+  box-shadow: none;
 }
 
 .back-button:hover {
-  background: #F5F7FA;
   color: #A30113;
 }
 
@@ -217,7 +216,7 @@ onMounted(() => {
 }
 
 .back-button:hover svg {
-  transform: translateX(-2px);
+  transform: translateX(-4px);
 }
 
 @media (max-width: 768px) {