diff --git a/track-uniapp/src/pages/scan/components/TreeCanvas.vue b/track-uniapp/src/pages/scan/components/TreeCanvas.vue
index 75a0873..6fe7042 100644
--- a/track-uniapp/src/pages/scan/components/TreeCanvas.vue
+++ b/track-uniapp/src/pages/scan/components/TreeCanvas.vue
@@ -145,6 +145,7 @@ export default {
     // ============================================================
     // 🚀 连线计算：中央 → 分支
     // ============================================================
+    // 🔧 连线：卡片边缘到边缘，杜绝穿模
     lines() {
       const result = [];
       const flatMap = {};
@@ -153,14 +154,18 @@ export default {
         if (n._isMain) return;
         const parent = n.parent_task_id ? flatMap[n.parent_task_id] : null;
         if (!parent) return;
-        const px = parent.x + 160; // 卡片右边缘
-        const py = parent.y + 40;  // 卡片垂直中心
-        const nx = n.x;             // 分支卡片左边缘
-        const ny = n.y + 40;
-        result.push({ x1: Math.min(px, nx), y1: py, x2: Math.max(px, nx), y2: py, dashed: parent.status === 'COMPLETED' || parent.status === 'ARCHIVED' });
+        const isLeft = n.x < parent.x;
+        const startX = isLeft ? n.x + 160 : parent.x + 160;  // 左分支右边缘 / 主干右边缘
+        const endX   = isLeft ? parent.x   : n.x;             // 主干左边缘  / 右分支左边缘
+        result.push({
+          x1: startX, y1: parent.y + 40,
+          x2: endX,   y2: parent.y + 40,
+          dashed: parent.status === 'COMPLETED' || parent.status === 'ARCHIVED',
+        });
       });
       return result;
     },
+    // 🔧 箭头：像素级贴合分支卡片边缘
     arrows() {
       const result = [];
       const flatMap = {};
@@ -172,8 +177,8 @@ export default {
         const isLegacy = parent && (parent.status === 'COMPLETED' || parent.status === 'ARCHIVED');
         const isLeft = n.x < parent.x;
         result.push({
-          x: isLeft ? n.x + 165 : n.x - 12,
-          y: n.y + 36,
+          x: isLeft ? n.x + 160 : n.x - 6,   // 左分支: 卡片右边缘; 右分支: 卡片左边缘-箭头宽度
+          y: n.y + 40 - 2,                     // 垂直居中 (border 4+4=8, -2 微调)
           rot: isLeft ? 180 : 0,
           dashed: isLegacy,
         });