修复注册省市区选项超过宽度的bug

src/views/Register.vue

@@ -1012,4 +1012,81 @@ onMounted(() => {
 :deep(.el-link.viewed:hover) {
   color: #529b2e !important;
 }
+
+/* 移动端级联选择器样式优化 */
+:deep(.mobile-cascader-popper) {
+  max-width: calc(100vw - 20px) !important;
+  left: 10px !important;
+  right: 10px !important;
+  transform: none !important;
+  margin: 0 !important;
+}
+
+:deep(.mobile-cascader-popper .el-cascader-panel) {
+  max-width: 100% !important;
+  overflow-x: hidden !important;
+  display: flex !important;
+  gap: 0 !important;
+  padding: 0 !important;
+}
+
+:deep(.mobile-cascader-popper .el-cascader-menu) {
+  min-width: 33.33% !important;
+  max-width: 33.33% !important;
+  width: 33.33% !important;
+  flex-shrink: 0 !important;
+  flex-grow: 0 !important;
+  overflow-x: hidden !important;
+  border-right: 1px solid #e4e7ed;
+  margin: 0 !important;
+}
+
+:deep(.mobile-cascader-popper .el-cascader-menu:last-child) {
+  border-right: none !important;
+}
+
+:deep(.mobile-cascader-popper .el-cascader-menu__item) {
+  padding: 6px 3px !important;
+  line-height: 1.1 !important;
+  font-size: 12px !important;
+  white-space: nowrap !important;
+  overflow: hidden !important;
+  text-overflow: ellipsis !important;
+  margin: 0 !important;
+  box-sizing: border-box !important;
+}
+
+@media (max-width: 480px) {
+  :deep(.mobile-cascader-popper) {
+    max-width: calc(100vw - 16px) !important;
+    left: 8px !important;
+    right: 8px !important;
+  }
+  
+  :deep(.mobile-cascader-popper .el-cascader-menu__item) {
+    padding: 5px 2px !important;
+    font-size: 11px !important;
+  }
+}
+
+@media (max-width: 360px) {
+  :deep(.mobile-cascader-popper) {
+    max-width: calc(100vw - 12px) !important;
+    left: 6px !important;
+    right: 6px !important;
+  }
+  
+  :deep(.mobile-cascader-popper .el-cascader-menu__item) {
+    padding: 4px 1px !important;
+    font-size: 10px !important;
+    line-height: 1.0 !important;
+  }
+}
+
+@media (max-width: 320px) {
+  :deep(.mobile-cascader-popper .el-cascader-menu__item) {
+    padding: 3px 1px !important;
+    font-size: 9px !important;
+  }
+}
 </style>