diff --git a/web/src/components/game/Viewport.vue b/web/src/components/game/Viewport.vue
index aae58c6..baf193a 100644
--- a/web/src/components/game/Viewport.vue
+++ b/web/src/components/game/Viewport.vue
@@ -50,25 +50,32 @@ function fitMap() {
     // Don't fit if world is default small
     if (worldWidth < 100) return 
 
-    viewport.resize(props.screenWidth, props.screenHeight, worldWidth, worldHeight)
-    viewport.fit(true, worldWidth, worldHeight)
-    
+    // 1. 先计算新的缩放限制
     const fitScale = Math.min(props.screenWidth / worldWidth, props.screenHeight / worldHeight)
-    // Allow zooming out a bit more than fit
-    viewport.clampZoom({ minScale: fitScale * 0.8, maxScale: 4.0 }) 
     
-    // If current zoom is weird, reset
-    if (viewport.scaled < fitScale) viewport.setZoom(fitScale)
+    // 2. 重要：在 fit() 之前先设置新的 clampZoom，或者先暂时移除旧的限制
+    // 这里我们直接设置新的宽松限制
+    viewport.clampZoom({ minScale: fitScale * 0.8, maxScale: 4.0 }) 
+
+    // 3. 更新尺寸
+    viewport.resize(props.screenWidth, props.screenHeight, worldWidth, worldHeight)
+    
+    // 4. 执行适配，并在中心位置
+    viewport.fit(true, worldWidth, worldHeight)
+    viewport.moveCenter(worldWidth / 2, worldHeight / 2)
+    
+    // 5. 如果当前缩放比预期的还要大（虽然 fit 应该已经处理了，但双保险），强制设置
+    if (viewport.scaled > fitScale * 1.1) { // 允许一点误差
+       viewport.setZoom(fitScale)
+    }
 }
 
 watch(() => [props.screenWidth, props.screenHeight], ([w, h]) => {
   if (viewport) {
-    viewport.resize(w, h, props.worldWidth, props.worldHeight)
-    // Optional: Refit on significant resize or just clamp?
-    // clampZoom updates automatically if minScale is not dynamic? 
-    // No, we set minScale manually. We should re-clamp.
+    // 窗口大小改变时，重新计算最小缩放值，防止用户看到黑边
     const fitScale = Math.min(w / props.worldWidth, h / props.worldHeight)
     viewport.clampZoom({ minScale: fitScale * 0.8, maxScale: 4.0 }) 
+    viewport.resize(w, h, props.worldWidth, props.worldHeight)
   }
 })