diff --git a/punchnet/Views/Network/NetworkView.swift b/punchnet/Views/Network/NetworkView.swift
index cf36e30..fec8e52 100644
--- a/punchnet/Views/Network/NetworkView.swift
+++ b/punchnet/Views/Network/NetworkView.swift
@@ -242,21 +242,47 @@ struct NetworkDeviceGroupView: View {
     @Environment(AppContext.self) private var appContext: AppContext
     @State private var selectedId: Int?
     
+    // 侧边栏宽度
+    private let sidebarWidth: CGFloat = 240
+
     var body: some View {
-        NavigationSplitView {
-            List(appContext.networkContext.nodeList, id: \.id, selection: $selectedId) { node in
-                NetworkNodeHeadView(node: node)
-                    .tag(node.id)
+        HStack(spacing: 0) {
+            // --- 1. 自定义侧边栏 (Sidebar) ---
+            VStack(alignment: .leading, spacing: 0) {
+                // 顶部留白：避开 macOS 窗口左上角的红绿灯按钮
+                // 如果你的 WindowStyle 是 .hiddenTitleBar，这个 Padding 非常重要
+                Color.clear.frame(height: 28)
+
+                List(appContext.networkContext.nodeList, id: \.id, selection: $selectedId) { node in
+                    NetworkNodeHeadView(node: node)
+                        // 技巧：在 HStack 方案中，tag 配合 List 的 selection 依然有效
+                        .tag(node.id)
+                        .listRowSeparator(.hidden)
+                }
+                .listStyle(.inset) // 使用 inset 样式在自定义侧边栏中更美观
+                .scrollContentBackground(.hidden) // 隐藏默认白色背景，显示下方的磨砂材质
             }
-            .listStyle(.sidebar)
-            .navigationSplitViewColumnWidth(min: 200, ideal: 220)
-        } detail: {
-            if let selectedNode = appContext.networkContext.getNode(id: selectedId) {
-                NetworkNodeDetailView(node: selectedNode)
-            } else {
-                ContentUnavailableView("选择成员设备", systemImage: "macbook.and.iphone", description: Text("查看详细网络信息和服务"))
+            .frame(width: sidebarWidth)
+            
+            Divider() // 分割线
+            
+            // --- 2. 详情区域 (Detail) ---
+            ZStack {
+                if let selectedNode = appContext.networkContext.getNode(id: selectedId) {
+                    NetworkNodeDetailView(node: selectedNode)
+                        .transition(.opacity.animation(.easeInOut(duration: 0.2)))
+                } else {
+                    ContentUnavailableView(
+                        "选择成员设备",
+                        systemImage: "macbook.and.iphone",
+                        description: Text("查看详细网络信息和服务")
+                    )
+                }
             }
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
+            .background(Color(nsColor: .windowBackgroundColor)) // 详情页使用标准窗口背景色
         }
+        .ignoresSafeArea() // 真正顶到最上方
         .onAppear {
             if selectedId == nil {
                 selectedId = appContext.networkContext.firstNodeId()