diff --git a/miniapp/pages/index/index.js b/miniapp/pages/index/index.js
index 4a6c770..19385d2 100644
--- a/miniapp/pages/index/index.js
+++ b/miniapp/pages/index/index.js
@@ -565,7 +565,8 @@ function buildSankeyLayout(links, width, height, renderOptions) {
   });
 
   const leftX = padding;
-  const rightX = Math.max(padding + nodeWidth + 80, width - padding - nodeWidth);
+  // 右侧节点贴齐预览窗右边界（x + nodeWidth = width），与 Web 视觉保持一致。
+  const rightX = Math.max(leftX + nodeWidth + 40, width - nodeWidth);
   const columnStep = maxDepth > 0 ? (rightX - leftX) / maxDepth : 0;
 
   const nodePositionMap = {};