diff --git a/ios/CDrop/MacApp/CommilitiaDropMacApp.swift b/ios/CDrop/MacApp/CommilitiaDropMacApp.swift
index 3b664a4..4a478b9 100644
--- a/ios/CDrop/MacApp/CommilitiaDropMacApp.swift
+++ b/ios/CDrop/MacApp/CommilitiaDropMacApp.swift
@@ -1,18 +1,21 @@
 #if os(macOS)
 import SwiftUI
 
-// 原生 macOS 客户端入口。单窗口 + 菜单栏常驻，桌面壳（MacRootView）替代 iOS 的标签栏。
-// 当前为脚手架：导航骨架 + 菜单栏占位；引擎（LibWebRtcEngine + 离屏 WebView）、复用视图与
-// 桌面专属功能（剪贴板自动同步 / 全局热键 / 原生通知）随后续阶段并入。iOS 入口另见 CDropApp。
+// 原生 macOS 客户端入口。单窗口 + 菜单栏常驻，桌面壳（MacRootView）替代 iOS 的标签栏。复用 iOS 引擎
+// （EngineController：离屏 WKWebView 跑 JS 引擎 + 原生 libwebrtc 数据面）与鉴权（AuthManager：Broker
+// 登录）；引擎 WebView 挂在 MacRootView 背景保活（登录后才启）。iOS 入口另见 CDropApp。桌面专属功能
+// （剪贴板自动同步 / 全局热键 / 原生通知）随后续阶段并入。
 @main
 struct CommilitiaDropMacApp: App
 {
+    @State private var auth = AuthManager()
+    @State private var engine = EngineController()
+
     var body: some Scene
     {
-        // 启动即打开的单主窗口。
         Window("Commilitia Drop", id: "main")
         {
-            MacRootView()
+            MacAppRoot(auth: auth, engine: engine)
                 .frame(minWidth: 820, minHeight: 560)
         }
         .defaultLaunchBehavior(.presented)
@@ -23,10 +26,11 @@ struct CommilitiaDropMacApp: App
             CommandGroup(replacing: .newItem) {}
         }
 
-        // 菜单栏常驻：状态 + 快捷剪贴板 / Quick Send（当前占位）。
         MenuBarExtra
         {
             MacMenuContent()
+                .environment(engine)
+                .environment(auth)
         }
         label:
         {
@@ -35,4 +39,40 @@ struct CommilitiaDropMacApp: App
         .menuBarExtraStyle(.window)
     }
 }
+
+// 登录门：有会话进桌面壳（引擎随 MacRootView 背景 WebView 启动），无会话进原生 Broker 登录页。逻辑
+// 对齐 iOS 的 AppRoot（CDropApp）：注入 auth 源、会话激活即按 userId 加载持久记录。
+struct MacAppRoot: View
+{
+    let auth: AuthManager
+    let engine: EngineController
+
+    var body: some View
+    {
+        Group
+        {
+            if auth.session != nil
+            {
+                MacRootView()
+                    .environment(engine)
+                    .environment(auth)
+            }
+            else
+            {
+                MacLoginView()
+                    .environment(auth)
+            }
+        }
+        .onAppear
+        {
+            engine.auth = auth
+            // 冷启已有会话：立即按 userId 加载该用户的持久记录（reset 只清内存不动盘）。
+            if let uid = auth.session?.user.id { engine.activateRecords(userId: uid) }
+        }
+        .onChange(of: auth.session?.user.id)
+        { _, uid in
+            if let uid { engine.activateRecords(userId: uid) }
+        }
+    }
+}
 #endif
diff --git a/ios/CDrop/MacApp/MacLoginView.swift b/ios/CDrop/MacApp/MacLoginView.swift
new file mode 100644
index 0000000..dfbf654
--- /dev/null
+++ b/ios/CDrop/MacApp/MacLoginView.swift
@@ -0,0 +1,54 @@
+#if os(macOS)
+import SwiftUI
+
+// 原生 macOS 登录：以 Commilitia 账户（Auth Broker）登录为主，免相机——ASWebAuthenticationSession
+// 弹系统授权窗，回调经 cdrop:// 回到 app（见 BrokerLogin / AuthManager.startBrokerLogin）。不复用
+// iOS 的 LoginView（其二维码 / UIImage 路径为 iOS 专属，且没人扫 Mac 屏幕来登录 Mac 自己）。
+struct MacLoginView: View
+{
+    @Environment(AuthManager.self) private var auth
+    @State private var busy = false
+
+    var body: some View
+    {
+        VStack(spacing: 20)
+        {
+            Image(systemName: "paperplane.fill")
+                .font(.system(size: 52))
+                .foregroundStyle(.tint)
+            Text("Commilitia Drop")
+                .font(.largeTitle.weight(.semibold))
+            Text("跨设备直连传输与云剪贴板")
+                .font(.callout)
+                .foregroundStyle(.secondary)
+
+            Button
+            {
+                busy = true
+                Task
+                {
+                    await auth.startBrokerLogin()
+                    busy = false
+                }
+            }
+            label:
+            {
+                Text(busy ? "登录中…" : "使用 Commilitia 账户登录")
+                    .frame(maxWidth: 260)
+            }
+            .controlSize(.large)
+            .buttonStyle(.borderedProminent)
+            .disabled(busy)
+
+            if !auth.statusText.isEmpty
+            {
+                Text(auth.statusText)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+        }
+        .padding(40)
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+}
+#endif
diff --git a/ios/CDrop/MacApp/MacMenuContent.swift b/ios/CDrop/MacApp/MacMenuContent.swift
index fe1eca9..d8eb18c 100644
--- a/ios/CDrop/MacApp/MacMenuContent.swift
+++ b/ios/CDrop/MacApp/MacMenuContent.swift
@@ -1,9 +1,11 @@
 #if os(macOS)
 import SwiftUI
 
-// 菜单栏常驻内容（占位）：后续接入连接状态 + 一键剪贴板 push/pull + Quick Send。
+// 菜单栏常驻内容：账号 / 在线设备数 / 打开主窗口。后续接入一键剪贴板 push/pull + Quick Send。
 struct MacMenuContent: View
 {
+    @Environment(EngineController.self) private var engine
+    @Environment(AuthManager.self) private var auth
     @Environment(\.openWindow) private var openWindow
 
     var body: some View
@@ -12,9 +14,22 @@ struct MacMenuContent: View
         {
             Text("Commilitia Drop")
                 .font(.headline)
-            Text("桌面功能适配中")
-                .font(.caption)
-                .foregroundStyle(.secondary)
+
+            if let name = auth.session?.user.name
+            {
+                Text(name)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+                Text("在线设备：\(engine.devices.filter(\.online).count)")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+            else
+            {
+                Text("未登录")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
 
             Divider()
             Button("打开主窗口") { openWindow(id: "main") }
diff --git a/ios/CDrop/MacApp/MacRootView.swift b/ios/CDrop/MacApp/MacRootView.swift
index f0b92fe..cec9fd4 100644
--- a/ios/CDrop/MacApp/MacRootView.swift
+++ b/ios/CDrop/MacApp/MacRootView.swift
@@ -2,10 +2,13 @@
 import SwiftUI
 
 // 桌面根界面：NavigationSplitView 侧栏（传输 / 文件 / 消息 / 设备 / 设置）+ 详情 NavigationStack，
-// 替代 iOS 的标签栏。当前为脚手架：各区详情为占位（MacPlaceholder），随后续阶段接入复用视图
-// 与桌面专属功能。分区标签暂硬编中文；接入 i18n（Shared/I18n）后改走 t()（与 iOS 单一真源一致）。
+// 替代 iOS 的标签栏。离屏无头引擎 WebView 挂在背景保活（同 iOS RootView）。传输 / 文件 / 消息详情为
+// 占位（随 Phase 3b 复用 iOS 视图）；设备 / 设置已接引擎真实态（presence / 账号 / 日志），作 3a 引擎
+// 联通证明。分区标签暂硬编中文；接入 i18n（t()）待 Phase 3b 复用视图时统一。
 struct MacRootView: View
 {
+    @Environment(EngineController.self) private var engine
+    @Environment(AuthManager.self) private var auth
     @State private var selection: MacSection = .transfers
 
     var body: some View
@@ -23,6 +26,7 @@ struct MacRootView: View
                     ForEach(MacSection.sidebar)
                     { section in
                         Label(section.title, systemImage: section.icon)
+                            .badge(badge(for: section))
                             .tag(section)
                     }
                 }
@@ -37,6 +41,14 @@ struct MacRootView: View
                 detail
             }
         }
+        // 离屏无头引擎 WebView：零尺寸不可见，仅保持存活（登录后随本视图出现即 boot）。同 iOS RootView。
+        .background
+        {
+            EngineWebView(controller: engine, auth: auth)
+                .frame(width: 0, height: 0)
+                .opacity(0)
+                .allowsHitTesting(false)
+        }
     }
 
     @ViewBuilder
@@ -51,9 +63,9 @@ struct MacRootView: View
         case .messages:
             MacPlaceholder(section: .messages)
         case .devices:
-            MacPlaceholder(section: .devices)
+            MacDevicesView()
         case .settings:
-            MacPlaceholder(section: .settings)
+            MacSettingsView()
         }
     }
 
@@ -69,6 +81,17 @@ struct MacRootView: View
                 .lineLimit(1)
         }
     }
+
+    // 未读红点：消息 / 传输（对齐 iOS RootView 的 badge）。
+    private func badge(for section: MacSection) -> Int
+    {
+        switch section
+        {
+        case .messages: return engine.unreadMessages
+        case .transfers: return engine.unreadTransfers
+        default: return 0
+        }
+    }
 }
 
 // 侧栏分区。与 iOS 标签一致：传输 / 文件 / 消息 / 设备 / 设置。
@@ -105,7 +128,7 @@ enum MacSection: Hashable, Identifiable, CaseIterable
     static var sidebar: [MacSection] { MacSection.allCases }
 }
 
-// 阶段占位详情：标明该区将接入的功能，随后续阶段替换为实际视图。
+// 阶段占位详情（传输 / 文件 / 消息，随 Phase 3b 替换为复用 iOS 视图）。
 struct MacPlaceholder: View
 {
     let section: MacSection
@@ -123,4 +146,84 @@ struct MacPlaceholder: View
         .navigationTitle(section.title)
     }
 }
+
+// 设备：引擎经桥推来的真实 presence（在线绿点 + 名称 + 类型），证明登录后引擎已联通信令 / SSE。
+struct MacDevicesView: View
+{
+    @Environment(EngineController.self) private var engine
+
+    var body: some View
+    {
+        Group
+        {
+            if engine.devices.isEmpty
+            {
+                ContentUnavailableView("暂无其他设备", systemImage: "laptopcomputer.and.iphone",
+                                       description: Text("同账户的其他在线设备将显示在此。"))
+            }
+            else
+            {
+                List(engine.devices)
+                { dev in
+                    HStack(spacing: 10)
+                    {
+                        Circle()
+                            .fill(dev.online ? Color.green : Color.secondary)
+                            .frame(width: 9, height: 9)
+                        Text(dev.name)
+                        Spacer()
+                        Text(dev.type)
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                    }
+                }
+            }
+        }
+        .navigationTitle("设备")
+    }
+}
+
+// 设置：账号 + 本机设备名 + 登出 + 引擎日志（3a 联通与现场自检）。
+struct MacSettingsView: View
+{
+    @Environment(EngineController.self) private var engine
+    @Environment(AuthManager.self) private var auth
+
+    var body: some View
+    {
+        Form
+        {
+            Section("账号")
+            {
+                LabeledContent("用户", value: auth.session?.user.name ?? "—")
+                LabeledContent("本机设备", value: engine.deviceName)
+                Button("登出", role: .destructive)
+                {
+                    engine.reset()
+                    auth.logout()
+                }
+            }
+            Section("引擎日志")
+            {
+                if engine.logs.isEmpty
+                {
+                    Text("暂无日志").foregroundStyle(.secondary)
+                }
+                else
+                {
+                    ForEach(engine.logs.prefix(30))
+                    { entry in
+                        Text(entry.message)
+                            .font(.caption.monospaced())
+                            .foregroundStyle(.secondary)
+                            .lineLimit(2)
+                            .textSelection(.enabled)
+                    }
+                }
+            }
+        }
+        .formStyle(.grouped)
+        .navigationTitle("设置")
+    }
+}
 #endif
diff --git a/ios/CDrop/Shared/Theme.swift b/ios/CDrop/Shared/Theme.swift
index 415fd5d..149230d 100644
--- a/ios/CDrop/Shared/Theme.swift
+++ b/ios/CDrop/Shared/Theme.swift
@@ -1,22 +1,44 @@
 import SwiftUI
+#if canImport(UIKit)
 import UIKit
+#elseif canImport(AppKit)
+import AppKit
+#endif
 
 // 品牌主色单一真源（强约束③，与 web 主 accent 对齐）：浅色 #644AC9 / 深色 #9580FF。放在 Shared，使主
 // app、控件 / 小组件扩展共用同一定义（此前仅在主 app 的 RootView 内，扩展无法引用）。
 extension Color
 {
+    #if os(iOS)
     static let cdropAccent = Color(uiColor: UIColor
     { trait in
         trait.userInterfaceStyle == .dark
             ? UIColor(red: 0.584, green: 0.502, blue: 1.0, alpha: 1)
             : UIColor(red: 0.392, green: 0.290, blue: 0.788, alpha: 1)
     })
+    #else
+    static let cdropAccent = Color(nsColor: NSColor(name: nil, dynamicProvider:
+    { appearance in
+        appearance.bestMatch(from: [ .aqua, .darkAqua ]) == .darkAqua
+            ? NSColor(red: 0.584, green: 0.502, blue: 1.0, alpha: 1)
+            : NSColor(red: 0.392, green: 0.290, blue: 0.788, alpha: 1)
+    }))
+    #endif
 
     // 品牌琥珀色（字标里「Drop」用色，对齐 web 品牌资产）：浅色 #DB9410 / 深色 #F8C637。
+    #if os(iOS)
     static let cdropAmber = Color(uiColor: UIColor
     { trait in
         trait.userInterfaceStyle == .dark
             ? UIColor(red: 0.973, green: 0.776, blue: 0.216, alpha: 1)
             : UIColor(red: 0.859, green: 0.580, blue: 0.063, alpha: 1)
     })
+    #else
+    static let cdropAmber = Color(nsColor: NSColor(name: nil, dynamicProvider:
+    { appearance in
+        appearance.bestMatch(from: [ .aqua, .darkAqua ]) == .darkAqua
+            ? NSColor(red: 0.973, green: 0.776, blue: 0.216, alpha: 1)
+            : NSColor(red: 0.859, green: 0.580, blue: 0.063, alpha: 1)
+    }))
+    #endif
 }
diff --git a/ios/CDrop/Sources/Auth/AuthManager.swift b/ios/CDrop/Sources/Auth/AuthManager.swift
index 85cddfd..5bbe802 100644
--- a/ios/CDrop/Sources/Auth/AuthManager.swift
+++ b/ios/CDrop/Sources/Auth/AuthManager.swift
@@ -1,7 +1,9 @@
 import AuthenticationServices
 import Foundation
 import Observation
+#if canImport(UIKit)
 import UIKit
+#endif
 
 // 扫码登录（新设备侧）+ 会话持有。iOS 显示二维码，已登录的 web / 桌面设备用“扫码登录”
 // 扫码批准，本端轮询 /api/auth/qr/status 拿到自签会话。字段 / 流程见后端 internal/httpapi/
diff --git a/ios/CDrop/Sources/Auth/BrokerLogin.swift b/ios/CDrop/Sources/Auth/BrokerLogin.swift
index e6d0dab..cebce47 100644
--- a/ios/CDrop/Sources/Auth/BrokerLogin.swift
+++ b/ios/CDrop/Sources/Auth/BrokerLogin.swift
@@ -1,7 +1,11 @@
 import AuthenticationServices
 import CryptoKit
 import Foundation
+#if canImport(UIKit)
 import UIKit
+#elseif canImport(AppKit)
+import AppKit
+#endif
 
 // 应用内 Broker 登录（device-authorization + PKCE，对齐桌面 desktop/platform/oauth.go）。iOS 无法
 // 跑 loopback 监听，故用 ASWebAuthenticationSession + 自定义 scheme 回调（cdrop://auth-callback）：
@@ -53,10 +57,14 @@ final class BrokerAuthFlow: NSObject, ASWebAuthenticationPresentationContextProv
 
     func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor
     {
+        #if os(iOS)
         let scenes = UIApplication.shared.connectedScenes.compactMap { $0 as? UIWindowScene }
         return scenes.flatMap { $0.windows }.first { $0.isKeyWindow }
             ?? scenes.first?.windows.first
             ?? ASPresentationAnchor()
+        #else
+        return NSApplication.shared.keyWindow ?? NSApplication.shared.windows.first ?? ASPresentationAnchor()
+        #endif
     }
 }
 
diff --git a/ios/CDrop/Sources/BackgroundTaskManager.swift b/ios/CDrop/Sources/BackgroundTaskManager.swift
index 0773306..45236c5 100644
--- a/ios/CDrop/Sources/BackgroundTaskManager.swift
+++ b/ios/CDrop/Sources/BackgroundTaskManager.swift
@@ -1,3 +1,4 @@
+#if os(iOS)
 import BackgroundTasks
 import UIKit
 
@@ -104,3 +105,15 @@ final class BackgroundTaskManager
         }
     }
 }
+#else
+// macOS 无 BackgroundTasks（BGContinuedProcessingTask 为 API_UNAVAILABLE(macos)）：桌面无「切后台
+// 挂起」概念，续传任务无意义。提供同签名 no-op stub，使 EngineController.syncBackgroundTask 等调用点
+// 在 macOS 编译无须改动。
+final class BackgroundTaskManager
+{
+    static let shared = BackgroundTaskManager()
+    private init() {}
+    func registerOnce() {}
+    func sync(activeCount: Int, fraction: Double) {}
+}
+#endif
diff --git a/ios/CDrop/Sources/DeviceNameStore.swift b/ios/CDrop/Sources/DeviceNameStore.swift
index 3e8f5ad..e3b2886 100644
--- a/ios/CDrop/Sources/DeviceNameStore.swift
+++ b/ios/CDrop/Sources/DeviceNameStore.swift
@@ -1,5 +1,7 @@
 import Foundation
+#if canImport(UIKit)
 import UIKit
+#endif
 
 // 用户可编辑的设备名，持久在 UserDefaults。用于扫码登录 qr/start 的初始 device_name。设备名
 // 已与会话令牌解耦：登录后在设置页改名经 PATCH /api/devices/{device_id} 即时生效（后端按稳定
@@ -14,7 +16,11 @@ enum DeviceNameStore
         get
         {
             if let v = UserDefaults.standard.string(forKey: key), !v.isEmpty { return v }
+            #if os(iOS)
             let sys = UIDevice.current.name
+            #else
+            let sys = Host.current().localizedName ?? ProcessInfo.processInfo.hostName
+            #endif
             return sys.isEmpty ? "iPhone" : sys
         }
         set
diff --git a/ios/CDrop/Sources/Engine/EngineController.swift b/ios/CDrop/Sources/Engine/EngineController.swift
index d207e47..eb5f425 100644
--- a/ios/CDrop/Sources/Engine/EngineController.swift
+++ b/ios/CDrop/Sources/Engine/EngineController.swift
@@ -1,6 +1,10 @@
 import Foundation
 import Observation
+#if canImport(UIKit)
 import UIKit
+#elseif canImport(AppKit)
+import AppKit
+#endif
 import WebKit
 
 // 引擎过桥推来的设备 presence（对应 web store 的 DeviceInfo）。lastSeen 是 ms epoch。
@@ -275,12 +279,18 @@ final class EngineController: NSObject
         let ucc = WKUserContentController()
         ucc.add(self, name: "cdropEngine")
 
-        // boot 注入：把登录后的真实会话注入引擎（无会话则 null）。device_type 标 ios 供后端
-        // 登记；api_base 默认空（引擎与 /api 同源，从 prod 加载时相对 URL 即可）。
+        // boot 注入：把登录后的真实会话注入引擎（无会话则 null）。device_type 标平台供后端登记 /
+        // 其他端设备图标 + isWakeable 推送判定；api_base 默认空（引擎与 /api 同源，从 prod 加载时相对
+        // URL 即可）。iOS 为 "ios"，原生 Mac 为 "macos"（与桌面 Wails 客户端一致，后端 / 各端已识别）。
         let debug = ProcessInfo.processInfo.environment["CDROP_DEBUG_SESSION"] == "1"
+        #if os(macOS)
+        let deviceType = "macos"
+        #else
+        let deviceType = "ios"
+        #endif
         let boot = "window.__CDROP_BOOT__ = { session: \(sessionJSON()), "
             + "device_name: \(jsString(currentDeviceName())), "
-            + "api_base: \(jsString(apiBaseForBoot())), device_type: \"ios\", debug: \(debug) };"
+            + "api_base: \(jsString(apiBaseForBoot())), device_type: \(jsString(deviceType)), debug: \(debug) };"
         ucc.addUserScript(WKUserScript(source: boot,
                                        injectionTime: .atDocumentStart,
                                        forMainFrameOnly: true))
@@ -539,7 +549,11 @@ final class EngineController: NSObject
     // 剪贴板上行：读本机 UIPasteboard 文本交引擎上传云剪贴板（用户手势触发，前台读取合规）。
     func uploadClipboard()
     {
+        #if os(macOS)
+        let content = NSPasteboard.general.string(forType: .string) ?? ""
+        #else
         let content = UIPasteboard.general.string ?? ""
+        #endif
         guard !content.isEmpty else { notify(t("ios.clipboard.empty"), kind: .info); return }
         sendCommand("clipboardUpload", payload: [ "content": content ])
     }
@@ -982,7 +996,12 @@ extension EngineController: WKScriptMessageHandler
             // 引擎拉回的云剪贴板内容 → 写入本机 UIPasteboard。
             if let p = payload as? [String: Any], let content = p["content"] as? String, !content.isEmpty
             {
+                #if os(macOS)
+                NSPasteboard.general.clearContents()
+                NSPasteboard.general.setString(content, forType: .string)
+                #else
                 UIPasteboard.general.string = content
+                #endif
                 notify(t("ios.clipboard.pulled"), kind: .success)
             }
             else
diff --git a/ios/CDrop/Sources/Engine/EngineWebView.swift b/ios/CDrop/Sources/Engine/EngineWebView.swift
index d073e9e..2e2ce5b 100644
--- a/ios/CDrop/Sources/Engine/EngineWebView.swift
+++ b/ios/CDrop/Sources/Engine/EngineWebView.swift
@@ -1,9 +1,18 @@
 import SwiftUI
 import WebKit
 
+// 跨平台桥接：iOS 用 UIViewRepresentable，macOS 原生用 NSViewRepresentable，二者所需方法名
+// （makeUIView/updateUIView 与 makeNSView/updateNSView）不同，故经 typealias 统一协议名后，
+// struct 体内仅方法实现按平台分支。
+#if os(iOS)
+private typealias PlatformViewRepresentable = UIViewRepresentable
+#else
+private typealias PlatformViewRepresentable = NSViewRepresentable
+#endif
+
 // 把 EngineController 持有的离屏 WKWebView 桥进 SwiftUI 视图树（保持存活）。无可见 UI
 // 用途——引擎由 controller 经 JS 桥驱动（见 ios/PLAN.md arch A）。
-struct EngineWebView: UIViewRepresentable
+struct EngineWebView: PlatformViewRepresentable
 {
     let controller: EngineController
     // 会话源：在构建 WebView（注入 __CDROP_BOOT__）之前确定性接好。冷启动重开时，本视图的
@@ -11,6 +20,7 @@ struct EngineWebView: UIViewRepresentable
     // session:null → 引擎报「missing injected session」整个 boot 死（#11）。故在此同步接好。
     let auth: AuthManager
 
+    #if os(iOS)
     func makeUIView(context: Context) -> WKWebView
     {
         controller.auth = auth
@@ -21,4 +31,16 @@ struct EngineWebView: UIViewRepresentable
     {
         // 无需更新。
     }
+    #else
+    func makeNSView(context: Context) -> WKWebView
+    {
+        controller.auth = auth
+        return controller.makeWebView()
+    }
+
+    func updateNSView(_ nsView: WKWebView, context: Context)
+    {
+        // 无需更新。
+    }
+    #endif
 }
diff --git a/ios/CDrop/Sources/PushRegistry.swift b/ios/CDrop/Sources/PushRegistry.swift
index 58c8aff..bf2b59e 100644
--- a/ios/CDrop/Sources/PushRegistry.swift
+++ b/ios/CDrop/Sources/PushRegistry.swift
@@ -1,4 +1,8 @@
+#if canImport(UIKit)
 import UIKit
+#elseif canImport(AppKit)
+import AppKit
+#endif
 import UserNotifications
 
 // APNs 设备令牌的交汇点：解耦 AppDelegate（经 UIKit 回调拿到令牌）与 EngineController（持
@@ -28,7 +32,13 @@ final class PushRegistry: NSObject
         UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge])
         { granted, _ in
             guard granted else { return }
-            Task { @MainActor in UIApplication.shared.registerForRemoteNotifications() }
+            Task { @MainActor in
+                #if os(iOS)
+                UIApplication.shared.registerForRemoteNotifications()
+                #else
+                NSApplication.shared.registerForRemoteNotifications()
+                #endif
+            }
         }
     }
 
diff --git a/ios/CDrop/Support/macOS/App-Info.plist b/ios/CDrop/Support/macOS/App-Info.plist
index 95d6468..ff6c112 100644
--- a/ios/CDrop/Support/macOS/App-Info.plist
+++ b/ios/CDrop/Support/macOS/App-Info.plist
@@ -24,9 +24,26 @@
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
 	<string>1.0</string>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleURLName</key>
+			<string>net.commilitia.Commilitia-Drop</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>cdrop</string>
+			</array>
+		</dict>
+	</array>
 	<key>CFBundleVersion</key>
 	<string>1</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>26.0</string>
+	<key>NSBonjourServices</key>
+	<array>
+		<string>_cdrop._tcp</string>
+	</array>
+	<key>NSLocalNetworkUsageDescription</key>
+	<string>Commilitia Drop 需要访问本地网络以发现同内网设备并建立直连传输。</string>
 </dict>
 </plist>
diff --git a/ios/CDrop/project.yml b/ios/CDrop/project.yml
index 2aaf1d4..2621925 100644
--- a/ios/CDrop/project.yml
+++ b/ios/CDrop/project.yml
@@ -180,6 +180,24 @@ targets:
     deploymentTarget: "26.0"
     sources:
       - path: MacApp
+      - path: Shared
+      # 复用 iOS 引擎与鉴权（跨平台 in-place，UIKit 处 #if 守卫 / AppKit 分支）。仅纳入「引擎 + 登录」
+      # 最小集：Engine 全部 + Auth（除 iOS 专属 LoginView，Mac 另写原生登录）+ 若干单例 + i18n。iOS UI
+      # 树（RootView / MessagesView / ScannerView / AppDelegate 等）暂不纳入，随 Phase 3b 复用。
+      - path: Sources/Engine
+      - path: Sources/Auth
+        excludes:
+          - LoginView.swift
+      - path: Sources/RecordsStore.swift
+      - path: Sources/PushRegistry.swift
+      - path: Sources/LocalNetworkPermission.swift
+      - path: Sources/DeviceNameStore.swift
+      - path: Sources/BackgroundTaskManager.swift
+      - path: Sources/Resources/i18n
+    dependencies:
+      # 原生数据面 libwebrtc（LibWebRtcEngine）。macOS 切片缺子头，构建经 just mac-prep 补齐
+      # （scripts/patch-macos-webrtc-headers.sh）。
+      - package: WebRTC
     info:
       path: Support/macOS/App-Info.plist
       properties:
@@ -191,6 +209,15 @@ targets:
           - zh-Hans
           - zh-Hant
           - en
+        # ASWebAuthenticationSession 的 OAuth 回调经 cdrop:// scheme 回到 app（同 iOS）。
+        CFBundleURLTypes:
+          - CFBundleURLName: net.commilitia.Commilitia-Drop
+            CFBundleURLSchemes:
+              - cdrop
+        # 本地网络：libwebrtc 收集 host 候选、同内网直连须本地网络权限（macOS 15+ 亦弹窗）。
+        NSLocalNetworkUsageDescription: "Commilitia Drop 需要访问本地网络以发现同内网设备并建立直连传输。"
+        NSBonjourServices:
+          - "_cdrop._tcp"
     settings:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: net.commilitia.Commilitia-Drop