优化界面

src/components/DeviceList.vue

@@ -3,7 +3,7 @@
     <el-card>
       <template #header>
         <div class="card-header">
-          <span>设备管理</span>
+          <h2 class="page-title">设备管理</h2>
           <el-button type="primary" @click="addDevice">添加设备</el-button>
         </div>
       </template>
@@ -211,10 +211,23 @@ export default {
 </script>
 
 <style scoped>
+.device-list {
+  padding: 20px;
+  max-width: 1200px;
+  margin: 0 auto;
+}
+
 .card-header {
   display: flex;
   justify-content: space-between;
   align-items: center;
+  padding: 15px 0;
+}
+
+.page-title {
+  margin: 0;
+  font-size: 1.5rem;
+  font-weight: bold;
 }
 
 .dialog-footer {
@@ -233,4 +246,15 @@ export default {
 .retry-btn {
   margin-top: 15px;
 }
+
+@media (max-width: 768px) {
+  .device-list {
+    padding: 10px;
+  }
+  
+  .card-header {
+    flex-direction: column;
+    gap: 15px;
+  }
+}
 </style>