diff --git a/Sources/App/AppDelegate.swift b/Sources/App/AppDelegate.swift
index 4721890..a8bdb26 100644
--- a/Sources/App/AppDelegate.swift
+++ b/Sources/App/AppDelegate.swift
@@ -1,6 +1,6 @@
 import Cocoa
 
-/// 应用主控制器，协调按键监听、语音识别、LLM 纠错和文本注入
+/// 应用主控制器，协调 Fn 键（语音输入）和 Control 键（AI 助手）两种模式
 final class AppDelegate: NSObject, NSApplicationDelegate {
 
     private let keyMonitor = KeyMonitor()
@@ -12,6 +12,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
 
     private var isRecording = false
     private var finalTranscription: String = ""
+    private var currentMode: LLMMode = .input
 
     func applicationDidFinishLaunching(_ notification: Notification) {
         NSApp.setActivationPolicy(.accessory)
@@ -29,14 +30,12 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
     // MARK: - Permissions
 
     private func requestAccessibilityPermission() {
-        // 自动打开系统设置
         NSWorkspace.shared.open(URL(string: "x-apple.systempreferences:com.apple.preference.security?Privacy_Accessibility")!)
 
-        // 显示提示
         let alert = NSAlert()
         alert.messageText = "需要辅助功能权限"
         alert.informativeText = """
-        Voice Input 需要「辅助功能」权限才能监听 Fn 键。
+        Voice Input 需要「辅助功能」权限才能监听 Fn 键和 Control 键。
 
         系统设置已自动打开，请：
         1. 点击左下角的锁并输入密码
@@ -50,13 +49,11 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         alert.addButton(withTitle: "退出")
 
         if alert.runModal() == .alertFirstButtonReturn {
-            // 轮询检查权限
             Timer.scheduledTimer(withTimeInterval: 2.0, repeats: true) { [weak self] timer in
                 if CGPreflightListenEventAccess() {
                     timer.invalidate()
                     DispatchQueue.main.async {
                         self?.startKeyMonitor()
-                        // 显示成功提示
                         let successAlert = NSAlert()
                         successAlert.messageText = "权限已授权"
                         successAlert.informativeText = "辅助功能权限已开启，Voice Input 正在运行。"
@@ -77,13 +74,23 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
             return
         }
 
+        // Fn 键：语音输入模式
         keyMonitor.onFnDown = { [weak self] in
+            self?.currentMode = .input
             self?.startRecording()
         }
-
         keyMonitor.onFnUp = { [weak self] in
             self?.stopRecording()
         }
+
+        // Control 键：AI 助手模式
+        keyMonitor.onControlDown = { [weak self] in
+            self?.currentMode = .assist
+            self?.startRecording()
+        }
+        keyMonitor.onControlUp = { [weak self] in
+            self?.stopRecording()
+        }
     }
 
     // MARK: - Recording
@@ -94,12 +101,14 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         finalTranscription = ""
 
         recordingPanel.showAnimated()
-        recordingPanel.updateText("Listening...")
+        
+        // 根据模式显示不同提示
+        let promptText = currentMode == .input ? "Listening..." : "Ask AI..."
+        recordingPanel.updateText(promptText)
 
         let language = Config.shared.language.rawValue
 
         Task { @MainActor in
-            // 启动音频电平监测
             let audioOK = audioMonitor.start()
             if audioOK {
                 audioMonitor.onLevelUpdate = { [weak self] level in
@@ -107,7 +116,6 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
                 }
             }
 
-            // 启动语音识别
             let speechOK = await speechRecognizer.start(language: language)
             if !speechOK {
                 recordingPanel.updateText("Recognition error")
@@ -125,18 +133,11 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
 
             speechRecognizer.onError = { error in
                 let nsError = error as NSError
-                // kAFAssistantErrorDomain code 1110 = 未检测到语音，属正常情况，不报错
                 if nsError.domain == "kAFAssistantErrorDomain" && nsError.code == 1110 {
                     return
                 }
                 print("[App] Speech error: \(error)")
             }
-
-            speechRecognizer.onStateChange = { [weak self] isActive in
-                if !isActive, self?.isRecording == true {
-                    // 识别意外停止
-                }
-            }
         }
     }
 
@@ -144,41 +145,86 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         guard isRecording else { return }
         isRecording = false
 
-        // 停止音频和识别
         audioMonitor.stop()
         _ = speechRecognizer.stop()
 
         let text = finalTranscription.trimmingCharacters(in: .whitespacesAndNewlines)
-
-        // 如果 LLM 启用且已配置
-        if Config.shared.llmEnabled && Config.shared.isLLMConfigured && !text.isEmpty {
-            recordingPanel.showRefining()
-
-            Task { @MainActor in
-                do {
-                    let result = try await llmRefiner.refine(text: text, config: Config.shared)
-                    recordingPanel.hideAnimated {
-                        TextInjector.inject(result.refinedText)
-                    }
-                } catch {
-                    print("[App] LLM error: \(error)")
-                    // LLM 失败，回退到原始文本
-                    recordingPanel.hideAnimated {
-                        TextInjector.inject(text)
-                    }
-                }
-            }
-        } else if !text.isEmpty {
-            recordingPanel.hideAnimated {
-                TextInjector.inject(text)
-            }
-        } else {
+        guard !text.isEmpty else {
             recordingPanel.hideAnimated()
+            finalTranscription = ""
+            return
+        }
+
+        let config = Config.shared.getLLMConfig(for: currentMode)
+
+        switch currentMode {
+        case .input:
+            // Fn 键模式：语音输入 + 纠错
+            handleInputMode(text: text, config: config)
+        case .assist:
+            // Control 键模式：AI 助手对话
+            handleAssistMode(text: text, config: config)
         }
 
         finalTranscription = ""
     }
 
+    // MARK: - Input Mode (Fn)
+
+    private func handleInputMode(text: String, config: LLMConfig) {
+        guard config.enabled && config.isConfigured else {
+            recordingPanel.hideAnimated {
+                TextInjector.inject(text)
+            }
+            return
+        }
+
+        recordingPanel.showRefining()
+
+        Task { @MainActor in
+            do {
+                let result = try await llmRefiner.refine(text: text, config: config)
+                recordingPanel.hideAnimated {
+                    TextInjector.inject(result.text)
+                }
+            } catch {
+                print("[App] LLM refine error: \(error)")
+                recordingPanel.hideAnimated {
+                    TextInjector.inject(text)
+                }
+            }
+        }
+    }
+
+    // MARK: - Assist Mode (Control)
+
+    private func handleAssistMode(text: String, config: LLMConfig) {
+        guard config.enabled && config.isConfigured else {
+            recordingPanel.updateText("AI 助手未配置")
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) { [weak self] in
+                self?.recordingPanel.hideAnimated()
+            }
+            return
+        }
+
+        recordingPanel.showThinking()
+
+        Task { @MainActor in
+            do {
+                let result = try await llmRefiner.chat(text: text, config: config)
+                recordingPanel.hideAnimated {
+                    TextInjector.inject(result.text)
+                }
+            } catch {
+                print("[App] LLM chat error: \(error)")
+                recordingPanel.updateText("请求失败，请检查配置")
+                DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) { [weak self] in
+                    self?.recordingPanel.hideAnimated()
+                }
+            }
+        }
+    }
+
     private func cancelRecording() {
         audioMonitor.stop()
         speechRecognizer.cancel()
diff --git a/Sources/App/MenuBarController.swift b/Sources/App/MenuBarController.swift
index 98745b4..b362a59 100644
--- a/Sources/App/MenuBarController.swift
+++ b/Sources/App/MenuBarController.swift
@@ -7,20 +7,38 @@ final class MenuBarController: NSObject {
     private let menu = NSMenu()
     private var languageMenuItems: [NSMenuItem] = []
 
-    // 子菜单引用
-    private let llmSubmenu = NSMenu()
-    private let llmEnabledItem: NSMenuItem
-    private let settingsWindow = SettingsWindow()
+    // Input LLM (Fn 键 - 语音输入纠错)
+    private let inputLLMSubmenu = NSMenu()
+    private let inputLLMEnabledItem: NSMenuItem
+    
+    // Assist LLM (Control 键 - AI 助手)
+    private let assistLLMSubmenu = NSMenu()
+    private let assistLLMEnabledItem: NSMenuItem
+    
+    // 设置窗口
+    private let inputSettingsWindow: SettingsWindow
+    private let assistSettingsWindow: SettingsWindow
 
     override init() {
         statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
 
-        // LLM 启用/禁用
-        llmEnabledItem = NSMenuItem(
-            title: "Enable LLM Refinement",
-            action: #selector(toggleLLM),
+        // Input LLM 启用项
+        inputLLMEnabledItem = NSMenuItem(
+            title: "Enable",
+            action: #selector(toggleInputLLM),
             keyEquivalent: ""
         )
+        
+        // Assist LLM 启用项
+        assistLLMEnabledItem = NSMenuItem(
+            title: "Enable",
+            action: #selector(toggleAssistLLM),
+            keyEquivalent: ""
+        )
+        
+        // 创建两个设置窗口
+        inputSettingsWindow = SettingsWindow(mode: .input)
+        assistSettingsWindow = SettingsWindow(mode: .assist)
 
         super.init()
 
@@ -70,24 +88,45 @@ final class MenuBarController: NSObject {
 
         menu.addItem(.separator())
 
-        // LLM 子菜单
-        llmSubmenu.addItem(llmEnabledItem)
-        llmEnabledItem.target = self
-        llmEnabledItem.action = #selector(toggleLLM)
-        updateLLMMenuState()
+        // ===== Input LLM (Fn 键 - 语音输入纠错) =====
+        inputLLMSubmenu.addItem(inputLLMEnabledItem)
+        inputLLMEnabledItem.target = self
+        inputLLMEnabledItem.action = #selector(toggleInputLLM)
+        updateInputLLMMenuState()
 
-        let settingsItem = NSMenuItem(
-            title: "LLM Settings...",
-            action: #selector(openSettings),
-            keyEquivalent: ","
+        let inputSettingsItem = NSMenuItem(
+            title: "Settings...",
+            action: #selector(openInputSettings),
+            keyEquivalent: ""
         )
-        settingsItem.target = self
-        llmSubmenu.addItem(settingsItem)
+        inputSettingsItem.target = self
+        inputLLMSubmenu.addItem(inputSettingsItem)
 
-        let llmSubmenuItem = NSMenuItem()
-        llmSubmenuItem.title = "LLM Refinement"
-        llmSubmenuItem.submenu = llmSubmenu
-        menu.addItem(llmSubmenuItem)
+        let inputSubmenuItem = NSMenuItem()
+        inputSubmenuItem.title = "🎤 Input LLM (Fn)"
+        inputSubmenuItem.submenu = inputLLMSubmenu
+        menu.addItem(inputSubmenuItem)
+
+        menu.addItem(.separator())
+
+        // ===== Assist LLM (Control 键 - AI 助手) =====
+        assistLLMSubmenu.addItem(assistLLMEnabledItem)
+        assistLLMEnabledItem.target = self
+        assistLLMEnabledItem.action = #selector(toggleAssistLLM)
+        updateAssistLLMMenuState()
+
+        let assistSettingsItem = NSMenuItem(
+            title: "Settings...",
+            action: #selector(openAssistSettings),
+            keyEquivalent: ""
+        )
+        assistSettingsItem.target = self
+        assistLLMSubmenu.addItem(assistSettingsItem)
+
+        let assistSubmenuItem = NSMenuItem()
+        assistSubmenuItem.title = "💬 Assist LLM (Control)"
+        assistSubmenuItem.submenu = assistLLMSubmenu
+        menu.addItem(assistSubmenuItem)
 
         menu.addItem(.separator())
 
@@ -103,8 +142,12 @@ final class MenuBarController: NSObject {
         statusItem.menu = menu
     }
 
-    private func updateLLMMenuState() {
-        llmEnabledItem.state = Config.shared.llmEnabled ? .on : .off
+    private func updateInputLLMMenuState() {
+        inputLLMEnabledItem.state = Config.shared.inputLLM.enabled ? .on : .off
+    }
+
+    private func updateAssistLLMMenuState() {
+        assistLLMEnabledItem.state = Config.shared.assistLLM.enabled ? .on : .off
     }
 
     private func updateLanguageMenuState() {
@@ -125,14 +168,29 @@ final class MenuBarController: NSObject {
         print("[Menu] Language switched to: \(lang.displayName)")
     }
 
-    @objc private func toggleLLM() {
-        Config.shared.llmEnabled.toggle()
-        updateLLMMenuState()
-        print("[Menu] LLM Refinement: \(Config.shared.llmEnabled ? "ON" : "OFF")")
+    @objc private func toggleInputLLM() {
+        var config = Config.shared.inputLLM
+        config.enabled.toggle()
+        Config.shared.inputLLM = config
+        updateInputLLMMenuState()
+        print("[Menu] Input LLM: \(config.enabled ? "ON" : "OFF")")
     }
 
-    @objc private func openSettings() {
-        settingsWindow.makeKeyAndOrderFront(nil)
+    @objc private func toggleAssistLLM() {
+        var config = Config.shared.assistLLM
+        config.enabled.toggle()
+        Config.shared.assistLLM = config
+        updateAssistLLMMenuState()
+        print("[Menu] Assist LLM: \(config.enabled ? "ON" : "OFF")")
+    }
+
+    @objc private func openInputSettings() {
+        inputSettingsWindow.makeKeyAndOrderFront(nil)
+        NSApp.activate(ignoringOtherApps: true)
+    }
+
+    @objc private func openAssistSettings() {
+        assistSettingsWindow.makeKeyAndOrderFront(nil)
         NSApp.activate(ignoringOtherApps: true)
     }
 
diff --git a/Sources/Core/KeyMonitor.swift b/Sources/Core/KeyMonitor.swift
index 99bb0b5..ec29ee9 100644
--- a/Sources/Core/KeyMonitor.swift
+++ b/Sources/Core/KeyMonitor.swift
@@ -1,18 +1,23 @@
 import Cocoa
 import CoreGraphics
 
-/// 全局 Fn / Globe 键监听器
+/// 全局热键监听器：Fn 键（语音输入）+ Control 键（AI 助手）
 final class KeyMonitor {
 
-    // Fn 键标志：CGEventFlags.maskSecondaryFn = 0x00800000
+    // Fn 键：NX_SECONDARYFNMASK
     private static let fnMask: UInt64 = 0x00800000
+    // Control 键：NX_CONTROLMASK
+    private static let controlMask: UInt64 = 0x00001000
 
     private var eventTap: CFMachPort?
     private var runLoopSource: CFRunLoopSource?
     private var isFnPressed = false
+    private var isControlPressed = false
 
     var onFnDown: (() -> Void)?
     var onFnUp: (() -> Void)?
+    var onControlDown: (() -> Void)?
+    var onControlUp: (() -> Void)?
 
     func start() -> Bool {
         guard eventTap == nil else { return true }
@@ -32,7 +37,6 @@ final class KeyMonitor {
             return monitor.handleEvent(proxy: proxy, type: type, event: event)
         }
 
-        // 尝试 HID 级 tap（能捕获被系统拦截的 Fn 键）
         var tap = CGEvent.tapCreate(
             tap: .cghidEventTap,
             place: .headInsertEventTap,
@@ -43,7 +47,6 @@ final class KeyMonitor {
         )
 
         if tap == nil {
-            // 回退到会话级 tap
             print("[KeyMonitor] ⚠️ HID tap failed, falling back to session tap")
             tap = CGEvent.tapCreate(
                 tap: .cgSessionEventTap,
@@ -65,7 +68,7 @@ final class KeyMonitor {
         CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, .commonModes)
         CGEvent.tapEnable(tap: tap, enable: true)
 
-        print("[KeyMonitor] ✅ Started")
+        print("[KeyMonitor] ✅ Started (Fn + Control)")
         return true
     }
 
@@ -82,24 +85,43 @@ final class KeyMonitor {
 
     private func handleEvent(proxy: CGEventTapProxy, type: CGEventType, event: CGEvent) -> Unmanaged<CGEvent>? {
         let flags = event.flags.rawValue
+        _ = event.getIntegerValueField(.keyboardEventKeycode)
+
         let fnInFlags = (flags & Self.fnMask) != 0
+        let controlInFlags = (flags & Self.controlMask) != 0
 
         switch type {
         case .flagsChanged:
+            // Fn 键检测
             if fnInFlags && !isFnPressed {
-                print("[KeyMonitor] ⚡️ Fn DOWN (flags=0x\(String(flags, radix: 16)))")
-                return handleFnDown()
+                isFnPressed = true
+                DispatchQueue.main.async { [weak self] in
+                    self?.onFnDown?()
+                }
+                return nil
             }
             if !fnInFlags && isFnPressed {
-                print("[KeyMonitor] ⚡️ Fn UP (flags=0x\(String(flags, radix: 16)))")
-                return handleFnUp()
+                isFnPressed = false
+                DispatchQueue.main.async { [weak self] in
+                    self?.onFnUp?()
+                }
+                return nil
             }
-            return Unmanaged.passUnretained(event)
-
-        case .keyDown, .keyUp:
-            let keyCode = event.getIntegerValueField(.keyboardEventKeycode)
-            if keyCode == 63 && fnInFlags {
-                return handleFnDown()
+            
+            // Control 键检测
+            if controlInFlags && !isControlPressed {
+                isControlPressed = true
+                DispatchQueue.main.async { [weak self] in
+                    self?.onControlDown?()
+                }
+                return nil
+            }
+            if !controlInFlags && isControlPressed {
+                isControlPressed = false
+                DispatchQueue.main.async { [weak self] in
+                    self?.onControlUp?()
+                }
+                return nil
             }
             return Unmanaged.passUnretained(event)
 
@@ -107,24 +129,4 @@ final class KeyMonitor {
             return Unmanaged.passUnretained(event)
         }
     }
-
-    private func handleFnDown() -> Unmanaged<CGEvent>? {
-        if !isFnPressed {
-            isFnPressed = true
-            DispatchQueue.main.async { [weak self] in
-                self?.onFnDown?()
-            }
-        }
-        return nil
-    }
-
-    private func handleFnUp() -> Unmanaged<CGEvent>? {
-        if isFnPressed {
-            isFnPressed = false
-            DispatchQueue.main.async { [weak self] in
-                self?.onFnUp?()
-            }
-        }
-        return nil
-    }
 }
diff --git a/Sources/Core/LLMRefiner.swift b/Sources/Core/LLMRefiner.swift
index 49a0c4f..45201b8 100644
--- a/Sources/Core/LLMRefiner.swift
+++ b/Sources/Core/LLMRefiner.swift
@@ -1,36 +1,23 @@
 import Foundation
 
-/// 通过 OpenAI 兼容 API 对转录文本进行纠错优化
+/// 通过 OpenAI 兼容 API 进行 LLM 处理
 final class LLMRefiner {
 
     private let session: URLSession = {
         let config = URLSessionConfiguration.default
-        config.timeoutIntervalForRequest = 15
-        config.timeoutIntervalForResource = 20
+        config.timeoutIntervalForRequest = 30
+        config.timeoutIntervalForResource = 60
         return URLSession(configuration: config)
     }()
 
-    /// 纠错结果
     struct RefinementResult {
-        let refinedText: String
+        let text: String
         let wasChanged: Bool
     }
 
-    /// 对转录文本进行纠错
-    /// - Parameters:
-    ///   - text: 原始转录文本
-    ///   - config: LLM 配置
-    /// - Returns: 纠错结果
-    func refine(text: String, config: Config) async throws -> RefinementResult {
-        let baseURL = config.llmBaseURL
-            .trimmingCharacters(in: CharacterSet(charactersIn: "/"))
-        let url = URL(string: "\(baseURL)/v1/chat/completions")!
-
-        var urlRequest = URLRequest(url: url)
-        urlRequest.httpMethod = "POST"
-        urlRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
-        urlRequest.setValue("Bearer \(config.llmAPIKey)", forHTTPHeaderField: "Authorization")
+    // MARK: - Fn 键模式：语音输入纠错
 
+    func refine(text: String, config: LLMConfig) async throws -> RefinementResult {
         let systemPrompt = """
         你是一个语音识别后处理工具。你唯一的任务是修正转录文本中的明显识别错误。规则：
         1. 修正中文同音字/词错误。语音识别经常把技术词汇识别为同音的日常词汇，例如：
@@ -44,6 +31,46 @@ final class LLMRefiner {
         7. 保留所有标点符号、空格、大小写和格式。
         8. 只返回修正后的文本，不要添加任何解释、前缀、后缀或 Markdown 标记。
         """
+        
+        return try await callLLM(
+            text: text,
+            systemPrompt: systemPrompt,
+            config: config
+        )
+    }
+
+    // MARK: - Control 键模式：AI 助手对话
+
+    func chat(text: String, config: LLMConfig) async throws -> RefinementResult {
+        let systemPrompt = """
+        你是一个 AI 助手，用户通过语音输入与你交流。用户的输入来自语音识别，可能存在同音字或转录错误，请结合上下文理解。
+
+        你的任务：
+        1. 回答用户的问题、提供信息或执行对话
+        2. 保持回答简洁自然，适合口语化场景
+        3. 如果用户输入模糊，尝试猜测意图并给出最可能的回答
+        4. 使用用户正在使用的语言，或用户明确要求的语言进行回复
+        5. 不要包含任何解释性文字、前缀、后缀或 Markdown 标记
+        6. 你的输出将直接进入用户的输入框，所以只返回最终回答内容
+        """
+        
+        return try await callLLM(
+            text: text,
+            systemPrompt: systemPrompt,
+            config: config
+        )
+    }
+
+    // MARK: - 通用调用
+
+    private func callLLM(text: String, systemPrompt: String, config: LLMConfig) async throws -> RefinementResult {
+        let baseURL = config.baseURL.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
+        let url = URL(string: "\(baseURL)/v1/chat/completions")!
+
+        var urlRequest = URLRequest(url: url)
+        urlRequest.httpMethod = "POST"
+        urlRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        urlRequest.setValue("Bearer \(config.apiKey)", forHTTPHeaderField: "Authorization")
 
         let messages: [[String: String]] = [
             ["role": "system", "content": systemPrompt],
@@ -51,7 +78,7 @@ final class LLMRefiner {
         ]
 
         let body: [String: Any] = [
-            "model": config.llmModel,
+            "model": config.model,
             "messages": messages,
             "max_tokens": 4096,
             "thinking": ["type": "disabled"]
@@ -76,22 +103,25 @@ final class LLMRefiner {
               let choices = json["choices"] as? [[String: Any]],
               let firstChoice = choices.first,
               let message = firstChoice["message"] as? [String: Any],
-              let refined = message["content"] as? String else {
+              let result = message["content"] as? String else {
             throw NSError(domain: "LLMRefiner", code: -2,
                           userInfo: [NSLocalizedDescriptionKey: "Failed to parse response"])
         }
 
-        let trimmed = refined.trimmingCharacters(in: .whitespacesAndNewlines)
+        let trimmed = result.trimmingCharacters(in: .whitespacesAndNewlines)
         let wasChanged = trimmed != text.trimmingCharacters(in: .whitespacesAndNewlines)
 
-        print("[LLM] Refinement \(wasChanged ? "changed" : "unchanged"): \"\(trimmed.prefix(80))...\"")
-        return RefinementResult(refinedText: trimmed, wasChanged: wasChanged)
+        return RefinementResult(text: trimmed, wasChanged: wasChanged)
     }
 
     /// 测试连接
-    func testConnection(config: Config) async throws -> String {
+    func testConnection(config: LLMConfig) async throws -> String {
         let testText = "测试连接"
-        let result = try await refine(text: testText, config: config)
-        return result.refinedText
+        let result = try await callLLM(
+            text: testText,
+            systemPrompt: "You are a helpful assistant. Reply with 'OK' only.",
+            config: config
+        )
+        return result.text
     }
 }
diff --git a/Sources/UI/RecordingPanel.swift b/Sources/UI/RecordingPanel.swift
index d8a5c56..75c303b 100644
--- a/Sources/UI/RecordingPanel.swift
+++ b/Sources/UI/RecordingPanel.swift
@@ -231,6 +231,33 @@ final class RecordingPanel: NSPanel {
         waveformView.updateLevel(0.3)
     }
 
+    /// 显示 AI 助手思考状态
+    func showThinking() {
+        textLabel.stringValue = "Thinking..."
+        let thinkingTextWidth: CGFloat = 120
+        let targetWidth: CGFloat = thinkingTextWidth + waveformSize.width + 44
+
+        NSAnimationContext.runAnimationGroup { ctx in
+            ctx.duration = 0.2
+            ctx.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
+            ctx.allowsImplicitAnimation = true
+
+            textWidthConstraint?.animator().constant = thinkingTextWidth
+
+            let frame = currentScreenFrame()
+            let y = bottomY(for: frame)
+            let newFrame = NSRect(
+                x: (frame.width - targetWidth) / 2,
+                y: y,
+                width: targetWidth,
+                height: panelHeight
+            )
+            animator().setFrame(newFrame, display: true)
+        }
+
+        waveformView.updateLevel(0.2)
+    }
+
     // 重写：允许在非 active 状态响应
     override var canBecomeKey: Bool { true }
     override var canBecomeMain: Bool { false }
diff --git a/Sources/UI/SettingsWindow.swift b/Sources/UI/SettingsWindow.swift
index 8cc5557..efcfc67 100644
--- a/Sources/UI/SettingsWindow.swift
+++ b/Sources/UI/SettingsWindow.swift
@@ -1,8 +1,9 @@
 import Cocoa
 
-/// LLM 设置窗口
+/// LLM 设置窗口（支持双模式）
 final class SettingsWindow: NSWindow {
 
+    private let mode: LLMMode
     private let baseURLField: NSTextField
     private let apiKeyField: NSSecureTextField
     private let modelField: NSTextField
@@ -10,8 +11,9 @@ final class SettingsWindow: NSWindow {
     private let saveButton: NSButton
     private let statusLabel: NSTextField
 
-    init() {
-        // 表单字段
+    init(mode: LLMMode) {
+        self.mode = mode
+        
         baseURLField = NSTextField(frame: .zero)
         apiKeyField = NSSecureTextField(frame: .zero)
         modelField = NSTextField(frame: .zero)
@@ -33,7 +35,7 @@ final class SettingsWindow: NSWindow {
     }
 
     private func configureWindow() {
-        title = "LLM Settings"
+        title = mode == .input ? "Input LLM Settings (Fn)" : "Assist LLM Settings (Control)"
         isReleasedWhenClosed = false
         center()
     }
@@ -41,7 +43,6 @@ final class SettingsWindow: NSWindow {
     private func buildUI() {
         guard let content = contentView else { return }
 
-        // 标签
         func makeLabel(_ text: String) -> NSTextField {
             let label = NSTextField(labelWithString: text)
             label.font = .systemFont(ofSize: 11, weight: .semibold)
@@ -51,20 +52,10 @@ final class SettingsWindow: NSWindow {
             return label
         }
 
-        func makeField(_ placeholder: String, isSecure: Bool = false) -> NSTextField {
-            let field = isSecure ? NSSecureTextField(frame: .zero) : NSTextField(frame: .zero)
-            field.placeholderString = placeholder
-            field.font = .systemFont(ofSize: 13)
-            field.bezelStyle = .roundedBezel
-            field.translatesAutoresizingMaskIntoConstraints = false
-            return field
-        }
-
         let baseURLLabel = makeLabel("API Base URL:")
         let apiKeyLabel = makeLabel("API Key:")
         let modelLabel = makeLabel("Model:")
 
-        // 使用实例字段
         baseURLField.placeholderString = "https://api.openai.com"
         baseURLField.font = .systemFont(ofSize: 13)
         baseURLField.bezelStyle = .roundedBezel
@@ -75,7 +66,7 @@ final class SettingsWindow: NSWindow {
         apiKeyField.bezelStyle = .roundedBezel
         apiKeyField.translatesAutoresizingMaskIntoConstraints = false
 
-        modelField.placeholderString = "gpt-3.5-turbo"
+        modelField.placeholderString = mode == .input ? "deepseek-v4-flash" : "gpt-4"
         modelField.font = .systemFont(ofSize: 13)
         modelField.bezelStyle = .roundedBezel
         modelField.translatesAutoresizingMaskIntoConstraints = false
@@ -97,11 +88,10 @@ final class SettingsWindow: NSWindow {
         statusLabel.maximumNumberOfLines = 2
         statusLabel.translatesAutoresizingMaskIntoConstraints = false
 
-        // 布局
         let grid = NSGridView(views: [
             [baseURLLabel, baseURLField],
-            [apiKeyLabel,  apiKeyField],
-            [modelLabel,   modelField]
+            [apiKeyLabel, apiKeyField],
+            [modelLabel, modelField]
         ])
         grid.translatesAutoresizingMaskIntoConstraints = false
         grid.column(at: 0).xPlacement = .trailing
@@ -135,20 +125,13 @@ final class SettingsWindow: NSWindow {
     }
 
     private func loadCurrentConfig() {
-        baseURLField.stringValue = Config.shared.llmBaseURL
-        apiKeyField.stringValue = Config.shared.llmAPIKey
-        modelField.stringValue = Config.shared.llmModel
+        let config = Config.shared.getLLMConfig(for: mode)
+        baseURLField.stringValue = config.baseURL
+        apiKeyField.stringValue = config.apiKey
+        modelField.stringValue = config.model
     }
 
     @objc private func testConnection() {
-        // 使用输入框当前值进行测试
-
-        statusLabel.stringValue = "Testing..."
-        statusLabel.textColor = .systemBlue
-
-        testButton.isEnabled = false
-        saveButton.isEnabled = false
-
         let url = baseURLField.stringValue.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
         let key = apiKeyField.stringValue
         let model = modelField.stringValue
@@ -156,21 +139,20 @@ final class SettingsWindow: NSWindow {
         guard !url.isEmpty, !key.isEmpty, !model.isEmpty else {
             statusLabel.stringValue = "Please fill all fields"
             statusLabel.textColor = .systemRed
-            testButton.isEnabled = true
-            saveButton.isEnabled = true
             return
         }
 
+        statusLabel.stringValue = "Testing..."
+        statusLabel.textColor = .systemBlue
+        testButton.isEnabled = false
+        saveButton.isEnabled = false
+
         Task { @MainActor in
             let refiner = LLMRefiner()
-            // 临时写入配置
-            let original = (Config.shared.llmBaseURL, Config.shared.llmAPIKey, Config.shared.llmModel)
-            Config.shared.llmBaseURL = url
-            Config.shared.llmAPIKey = key
-            Config.shared.llmModel = model
+            let testConfig = LLMConfig(enabled: true, baseURL: url, apiKey: key, model: model)
 
             do {
-                let result = try await refiner.testConnection(config: Config.shared)
+                let result = try await refiner.testConnection(config: testConfig)
                 statusLabel.stringValue = "✅ Connected! Response: \(result)"
                 statusLabel.textColor = .systemGreen
             } catch {
@@ -178,11 +160,6 @@ final class SettingsWindow: NSWindow {
                 statusLabel.textColor = .systemRed
             }
 
-            // 恢复
-            Config.shared.llmBaseURL = original.0
-            Config.shared.llmAPIKey = original.1
-            Config.shared.llmModel = original.2
-
             testButton.isEnabled = true
             saveButton.isEnabled = true
         }
@@ -193,9 +170,8 @@ final class SettingsWindow: NSWindow {
         let key = apiKeyField.stringValue
         let model = modelField.stringValue
 
-        Config.shared.llmBaseURL = url
-        Config.shared.llmAPIKey = key
-        Config.shared.llmModel = model
+        let config = LLMConfig(enabled: true, baseURL: url, apiKey: key, model: model)
+        Config.shared.setLLMConfig(config, for: mode)
 
         statusLabel.stringValue = "✅ Saved"
         statusLabel.textColor = .systemGreen
diff --git a/Sources/Utils/Config.swift b/Sources/Utils/Config.swift
index 14300be..a053f88 100644
--- a/Sources/Utils/Config.swift
+++ b/Sources/Utils/Config.swift
@@ -18,17 +18,43 @@ enum RecognitionLanguage: String, CaseIterable {
     }
 }
 
-struct Config {
-    static var shared = Config()
+enum LLMMode {
+    case input    // Fn 键：语音输入纠错
+    case assist   // Control 键：AI 助手对话
+}
+
+struct LLMConfig {
+    var enabled: Bool
+    var baseURL: String
+    var apiKey: String
+    var model: String
+    
+    var isConfigured: Bool {
+        !baseURL.isEmpty && !apiKey.isEmpty && !model.isEmpty
+    }
+}
+
+final class Config {
+    static let shared = Config()
+    
+    private init() {}
 
     private let defaults = UserDefaults.standard
 
     private enum Keys {
         static let language = "recognition_language"
-        static let llmEnabled = "llm_enabled"
-        static let llmBaseURL = "llm_base_url"
-        static let llmAPIKey = "llm_api_key"
-        static let llmModel = "llm_model"
+        
+        // Fn 键模式（语音输入纠错）
+        static let inputLLMEnabled = "input_llm_enabled"
+        static let inputLLMBaseURL = "input_llm_base_url"
+        static let inputLLMAPIKey = "input_llm_api_key"
+        static let inputLLMModel = "input_llm_model"
+        
+        // Control 键模式（AI 助手）
+        static let assistLLMEnabled = "assist_llm_enabled"
+        static let assistLLMBaseURL = "assist_llm_base_url"
+        static let assistLLMAPIKey = "assist_llm_api_key"
+        static let assistLLMModel = "assist_llm_model"
     }
 
     var language: RecognitionLanguage {
@@ -44,27 +70,94 @@ struct Config {
         }
     }
 
+    // MARK: - Fn 键模式配置（语音输入纠错）
+    
+    var inputLLM: LLMConfig {
+        get {
+            LLMConfig(
+                enabled: defaults.bool(forKey: Keys.inputLLMEnabled),
+                baseURL: defaults.string(forKey: Keys.inputLLMBaseURL) ?? "",
+                apiKey: defaults.string(forKey: Keys.inputLLMAPIKey) ?? "",
+                model: defaults.string(forKey: Keys.inputLLMModel) ?? ""
+            )
+        }
+        set {
+            defaults.set(newValue.enabled, forKey: Keys.inputLLMEnabled)
+            defaults.set(newValue.baseURL, forKey: Keys.inputLLMBaseURL)
+            defaults.set(newValue.apiKey, forKey: Keys.inputLLMAPIKey)
+            defaults.set(newValue.model, forKey: Keys.inputLLMModel)
+        }
+    }
+    
+    // 兼容旧版本
     var llmEnabled: Bool {
-        get { defaults.bool(forKey: Keys.llmEnabled) }
-        set { defaults.set(newValue, forKey: Keys.llmEnabled) }
+        get { inputLLM.enabled }
+        set { 
+            var cfg = inputLLM
+            cfg.enabled = newValue
+            inputLLM = cfg
+        }
     }
-
+    
     var llmBaseURL: String {
-        get { defaults.string(forKey: Keys.llmBaseURL) ?? "" }
-        set { defaults.set(newValue, forKey: Keys.llmBaseURL) }
+        get { inputLLM.baseURL }
+        set {
+            var cfg = inputLLM
+            cfg.baseURL = newValue
+            inputLLM = cfg
+        }
     }
-
+    
     var llmAPIKey: String {
-        get { defaults.string(forKey: Keys.llmAPIKey) ?? "" }
-        set { defaults.set(newValue, forKey: Keys.llmAPIKey) }
+        get { inputLLM.apiKey }
+        set {
+            var cfg = inputLLM
+            cfg.apiKey = newValue
+            inputLLM = cfg
+        }
     }
-
+    
     var llmModel: String {
-        get { defaults.string(forKey: Keys.llmModel) ?? "" }
-        set { defaults.set(newValue, forKey: Keys.llmModel) }
+        get { inputLLM.model }
+        set {
+            var cfg = inputLLM
+            cfg.model = newValue
+            inputLLM = cfg
+        }
     }
+    
+    var isLLMConfigured: Bool { inputLLM.isConfigured }
 
-    var isLLMConfigured: Bool {
-        !llmBaseURL.isEmpty && !llmAPIKey.isEmpty && !llmModel.isEmpty
+    // MARK: - Control 键模式配置（AI 助手）
+    
+    var assistLLM: LLMConfig {
+        get {
+            LLMConfig(
+                enabled: defaults.bool(forKey: Keys.assistLLMEnabled),
+                baseURL: defaults.string(forKey: Keys.assistLLMBaseURL) ?? "",
+                apiKey: defaults.string(forKey: Keys.assistLLMAPIKey) ?? "",
+                model: defaults.string(forKey: Keys.assistLLMModel) ?? ""
+            )
+        }
+        set {
+            defaults.set(newValue.enabled, forKey: Keys.assistLLMEnabled)
+            defaults.set(newValue.baseURL, forKey: Keys.assistLLMBaseURL)
+            defaults.set(newValue.apiKey, forKey: Keys.assistLLMAPIKey)
+            defaults.set(newValue.model, forKey: Keys.assistLLMModel)
+        }
+    }
+    
+    func getLLMConfig(for mode: LLMMode) -> LLMConfig {
+        switch mode {
+        case .input: return inputLLM
+        case .assist: return assistLLM
+        }
+    }
+    
+    func setLLMConfig(_ config: LLMConfig, for mode: LLMMode) {
+        switch mode {
+        case .input: inputLLM = config
+        case .assist: assistLLM = config
+        }
     }
 }
diff --git a/VoiceInput-20260424.dmg b/VoiceInput-20260424.dmg
index c03bfda..aaed257 100644
Binary files a/VoiceInput-20260424.dmg and b/VoiceInput-20260424.dmg differ