diff --git a/web/src/lib/app-theme.ts b/web/src/lib/app-theme.ts
index 32ee386bb..2dbad37b8 100644
--- a/web/src/lib/app-theme.ts
+++ b/web/src/lib/app-theme.ts
@@ -57,7 +57,8 @@ const controlTheme = {
 
 export function getAntThemeConfig(dark: boolean): ThemeConfig {
     const color = dark ? controlTheme.dark : controlTheme.light;
-    const elevatedBackground = dark ? "rgba(31, 31, 32, 0.96)" : "rgba(255, 255, 255, 0.96)";
+    // 浮层背景必须不透明（0.96 会透出下层内容）；与侧栏切换器等自定义浮层的实底背景保持一致
+    const elevatedBackground = dark ? "rgba(31, 31, 32, 1)" : "rgba(255, 255, 255, 1)";
     const subtleBackground = dark ? "rgba(255, 255, 255, 0.055)" : "rgba(17, 17, 17, 0.035)";
     const interactiveBorder = dark ? "rgba(255, 255, 255, 0.18)" : "rgba(17, 17, 17, 0.18)";
     // 黑白主题使用边框表达焦点，避免输入控件周围出现蓝紫色光圈。
diff --git a/web/src/styles/globals.css b/web/src/styles/globals.css
index ad85e9318..a2d26fc38 100644
--- a/web/src/styles/globals.css
+++ b/web/src/styles/globals.css
@@ -982,7 +982,7 @@
     body.app-spatial-overlays :where(
         .ant-dropdown-menu,
         .ant-select-dropdown,
-        .ant-popover-inner,
+        .ant-popover-container,
         .ant-picker-dropdown .ant-picker-panel-container,
         .ant-cascader-menus,
         .ant-mentions-dropdown,
@@ -1001,12 +1001,12 @@
         background: var(--workspace-overlay-bg-strong) !important;
     }
 
-    body.app-spatial-overlays :where(.ant-dropdown-menu, .ant-select-dropdown, .ant-popover-inner, .ant-cascader-menus, .ant-mentions-dropdown) {
+    body.app-spatial-overlays :where(.ant-dropdown-menu, .ant-select-dropdown, .ant-popover-container, .ant-cascader-menus, .ant-mentions-dropdown) {
         border-radius: 8px !important;
     }
 
     /* 展开菜单（下拉/弹出）取消阴影：层级由边框 + 背景对比表达 */
-    body.app-spatial-overlays :where(.ant-dropdown-menu, .ant-select-dropdown, .ant-popover-inner, .ant-cascader-menus, .ant-mentions-dropdown) {
+    body.app-spatial-overlays :where(.ant-dropdown-menu, .ant-select-dropdown, .ant-popover-container, .ant-cascader-menus, .ant-mentions-dropdown) {
         box-shadow: none !important;
     }
 
@@ -1042,8 +1042,8 @@
 
     body.app-spatial-overlays :where(
         .ant-dropdown-menu-item-divider,
-        .ant-popover-inner-content > .border-b,
-        .ant-popover-inner-content > .border-y,
+        .ant-popover-content > .border-b,
+        .ant-popover-content > .border-y,
         .ant-modal-header,
         .ant-modal-footer,
         .ant-drawer-header