diff --git a/csharp/systems/SpatialGridCs.cs b/csharp/systems/SpatialGridCs.cs
index f88e90b..a47afea 100644
--- a/csharp/systems/SpatialGridCs.cs
+++ b/csharp/systems/SpatialGridCs.cs
@@ -9,9 +9,12 @@ using System.Collections.Generic;
 
 public partial class SpatialGridCs : Node
 {
+    // ⚠️ 必须与 GDScript 外壳 spatial_grid.gd 的 CELL_SIZE / GRID_COLS / GRID_ROWS / GRID_OFFSET
+    //    逐一对齐；否则激活 C# 内核后两条路径格子映射不一致（负坐标塌陷 + 覆盖范围减半）。
     private const int CellSize   = 64;
-    private const int GridWidth  = 64;  // 64 格×64 格 = 4096×4096 像素覆盖范围
-    private const int GridHeight = 64;
+    private const int GridWidth  = 128;  // 128×128 格 × 64px = 8192×8192 覆盖范围
+    private const int GridHeight = 128;
+    private const int GridOffset = 4096; // 世界中心映射到网格中心（支持负坐标）
     private const int GridTotal  = GridWidth * GridHeight;
 
     // 网格主体：一维数组模拟二维，直接索引 grid[x + y * GridWidth]
@@ -39,8 +42,8 @@ public partial class SpatialGridCs : Node
     // 插入或更新实体位置（由 EnemyManager 每帧调用）
     public void Insert(int entityId, Vector2 pos)
     {
-        int cx = Mathf.Clamp((int)(pos.X / CellSize), 0, GridWidth  - 1);
-        int cy = Mathf.Clamp((int)(pos.Y / CellSize), 0, GridHeight - 1);
+        int cx = Mathf.Clamp((int)((pos.X + GridOffset) / CellSize), 0, GridWidth  - 1);
+        int cy = Mathf.Clamp((int)((pos.Y + GridOffset) / CellSize), 0, GridHeight - 1);
         int cellIdx = cx + cy * GridWidth;
 
         if (_entityCell.TryGetValue(entityId, out int oldCell))
@@ -61,10 +64,10 @@ public partial class SpatialGridCs : Node
     // ADR-L1 规厙1：内层 foreach 内禁止 Call()
     public int[] QueryCircle(Vector2 center, float radius)
     {
-        int minCx = Mathf.Clamp((int)((center.X - radius) / CellSize), 0, GridWidth  - 1);
-        int maxCx = Mathf.Clamp((int)((center.X + radius) / CellSize), 0, GridWidth  - 1);
-        int minCy = Mathf.Clamp((int)((center.Y - radius) / CellSize), 0, GridHeight - 1);
-        int maxCy = Mathf.Clamp((int)((center.Y + radius) / CellSize), 0, GridHeight - 1);
+        int minCx = Mathf.Clamp((int)((center.X - radius + GridOffset) / CellSize), 0, GridWidth  - 1);
+        int maxCx = Mathf.Clamp((int)((center.X + radius + GridOffset) / CellSize), 0, GridWidth  - 1);
+        int minCy = Mathf.Clamp((int)((center.Y - radius + GridOffset) / CellSize), 0, GridHeight - 1);
+        int maxCy = Mathf.Clamp((int)((center.Y + radius + GridOffset) / CellSize), 0, GridHeight - 1);
 
         var result = new List<int>(32);
         float radSq = radius * radius;