diff --git a/frontend/src/style.css b/frontend/src/style.css
index 8da7f958..e56deb2e 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -344,9 +344,17 @@ html.dark .el-drawer__header {
 .el-overlay { z-index: 2000 !important; }
 .el-overlay-dialog { z-index: 2001 !important; position: fixed !important; }
 .el-message-box__wrapper { z-index: 2002 !important; }
-/* 消息提示必须高于弹窗，避免在弹窗内操作时被遮挡；出现在顶栏下方（60px+间距） */
-.el-message { z-index: 3000 !important; top: 70px !important; }
-.el-message-box { margin: 0 !important; }
+/* 消息提示：置顶居中显示，避开左侧菜单与顶栏（顶栏60px+间距）；必须高于弹窗 */
+.el-message {
+  position: fixed !important;
+  top: 70px !important;
+  left: 50% !important;
+  right: auto !important;
+  transform: translateX(-50%) !important;
+  z-index: 3000 !important;
+  max-width: calc(100vw - 40px) !important;
+}
+/* el-message-box 保持默认居中（margin:15vh auto），勿清margin否则会靠左重叠菜单 */
 .el-dialog { --el-dialog-margin-top: 1vh !important; }
 
 /* 过渡动画 — 明暗切换平滑过渡 */