diff --git a/resources/views/business/pages/financial-rules/account-mapping.blade.php b/resources/views/business/pages/financial-rules/account-mapping.blade.php
index eb7bc548..3b313c61 100644
--- a/resources/views/business/pages/financial-rules/account-mapping.blade.php
+++ b/resources/views/business/pages/financial-rules/account-mapping.blade.php
@@ -117,10 +117,6 @@
             text-align: center;
             font-variant-numeric: tabular-nums;
         }
-        /* 首列被共享「列设置」固定成 position:sticky; z-index:6（见 finance-table-interactions），
-           而粘性表头只有 z-index:4，纵向滚动时数据行的序号会盖住「序号」表头。
-           表头这一格必须抬到固定单元格之上。 */
-        .am-table thead th.am-index { z-index: 7; }
 
         /* 行内编辑 */
         /* 注意：td 上有 height:2.5rem + white-space:nowrap（来自 upstream-data-table），
diff --git a/resources/views/business/pages/partials/finance-table-interactions.blade.php b/resources/views/business/pages/partials/finance-table-interactions.blade.php
index 898693b6..580b6e21 100644
--- a/resources/views/business/pages/partials/finance-table-interactions.blade.php
+++ b/resources/views/business/pages/partials/finance-table-interactions.blade.php
@@ -269,8 +269,16 @@
         background: var(--vip-surface, #ffffff);
     }
 
+    /* 固定列的层级阶梯：表体固定单元格 6，粘性表头其它列 4。
+       表头里的固定列如果只有 4，纵向滚动时数据行的固定单元格（6）会盖住表头文字
+       （首列「序号」、末端「操作」都出现过）。这里必须用 !important：
+       `.xxx-table thead th { z-index: 4 }` 特异性比 `thead [data-finance-fixed]` 高，
+       不加会被压回去。与目录表 thead th[data-directory-fixed] 的写法一致。 */
     thead [data-finance-fixed="true"],
-    thead [data-finance-fixed="end"] { background: var(--vip-content-accent-soft, #f7f0de); }
+    thead [data-finance-fixed="end"] {
+        z-index: 7 !important;
+        background: var(--vip-content-accent-soft, #f7f0de);
+    }
 
     [data-finance-column-key].is-column-hidden { display: none !important; }