fix: 片头动画改为用户触发而非自动播放

- OpeningFlowController: Start() 不再自动播放动画，新增 PlayOpeningFlow(Action onComplete) 公开方法
- PageController: OnFixationSelected() 先隐藏所有UI面板，调用 PlayOpeningFlow，动画结束后再显示 ExperimentPanel
- 新增 HideAllPages() 方法用于片头动画期间清空UI
- 所有按钮回调均保留 Debug.Log 输出

Assets/Scripts/UI/UIManager.cs

@@ -3,7 +3,8 @@ using UnityEngine.UI;
 
 /// <summary>
 /// UI 中央调度器：引用所有子面板，绑定 StepManager 事件。
-/// 挂在 Canvas GameObject 上。使用原生 Text（非 TMP）。
+/// 按钮策略：同时绑定 Inspector 引用（旧 RightButtons）和 ExperimentPanel/Navbar 按钮（新 UI），
+/// 两者均可触发，互不冲突。
 /// </summary>
 public class UIManager : MonoBehaviour
 {
@@ -26,7 +27,7 @@ public class UIManager : MonoBehaviour
     [Header("=== 画中画视频 ===")]
     [SerializeField] private VideoController _videoController;
 
-    [Header("=== 右侧功能按钮 ===")]
+    [Header("=== 仿真导航栏按钮（旧引用 + Navbar）===")]
     [SerializeField] private Button _btnFullScreen;
     [SerializeField] private Button _btnPrevious;
     [SerializeField] private Button _btnNext;
@@ -56,15 +57,117 @@ public class UIManager : MonoBehaviour
 
     private void Start()
     {
+        Debug.Log("=== UIManager 初始化开始 ===");
+
         if (_stepManager == null)
+        {
             _stepManager = FindObjectOfType<StepManager>();
+            if (_stepManager != null) Debug.Log("UIManager: _stepManager 自动查找成功");
+            else Debug.LogError("UIManager: _stepManager 未找到！");
+        }
+
         if (_interactionSystem == null)
+        {
             _interactionSystem = FindObjectOfType<InteractionSystem>();
+            if (_interactionSystem != null) Debug.Log("UIManager: _interactionSystem 自动查找成功");
+        }
 
         BindEvents();
-        BindButtons();
+        BindButtons();        // 旧引用（RightButtons 等）
+        BindNavbarButtons();  // 新 Navbar 按钮
+        Debug.Log("=== UIManager 初始化完成 ===");
     }
 
+    #region Navbar 按钮绑定（始终执行，不依赖 Inspector 引用）
+
+    private void BindNavbarButtons()
+    {
+        Debug.Log("--- UIManager: 开始绑定 Navbar 按钮 ---");
+
+        var experimentPanel = GameObject.Find("ExperimentPanel");
+        if (experimentPanel == null)
+        {
+            Debug.LogError("UIManager: ExperimentPanel 未找到！无法绑定 Navbar 按钮！");
+            return;
+        }
+
+        var navbar = experimentPanel.transform.Find("Navbar");
+        if (navbar == null)
+        {
+            Debug.LogError("UIManager: ExperimentPanel/Navbar 未找到！无法绑定 Navbar 按钮！");
+            return;
+        }
+
+        // FullScreen
+        var btnFS = navbar.Find("FullScreen");
+        if (btnFS != null)
+        {
+            var btn = btnFS.GetComponent<Button>();
+            if (btn != null)
+            {
+                btn.onClick.AddListener(ToggleFullScreen);
+                Debug.Log("UIManager: Navbar/FullScreen 绑定成功 -> ToggleFullScreen");
+            }
+        }
+        else Debug.LogWarning("UIManager: Navbar/FullScreen 未找到");
+
+        // Previous
+        var btnPrev = navbar.Find("Previous");
+        if (btnPrev != null)
+        {
+            var btn = btnPrev.GetComponent<Button>();
+            if (btn != null)
+            {
+                btn.onClick.AddListener(OnPreviousClicked);
+                Debug.Log("UIManager: Navbar/Previous 绑定成功 -> OnPreviousClicked");
+            }
+        }
+        else Debug.LogWarning("UIManager: Navbar/Previous 未找到");
+
+        // Next
+        var btnNext = navbar.Find("Next");
+        if (btnNext != null)
+        {
+            var btn = btnNext.GetComponent<Button>();
+            if (btn != null)
+            {
+                btn.onClick.AddListener(OnNextClicked);
+                Debug.Log("UIManager: Navbar/Next 绑定成功 -> OnNextClicked");
+            }
+        }
+        else Debug.LogWarning("UIManager: Navbar/Next 未找到");
+
+        // PracticeMode
+        var btnMode = navbar.Find("PracticeMode");
+        if (btnMode != null)
+        {
+            var btn = btnMode.GetComponent<Button>();
+            if (btn != null)
+            {
+                btn.onClick.AddListener(OnSwitchModeClicked);
+                Debug.Log("UIManager: Navbar/PracticeMode 绑定成功 -> OnSwitchModeClicked");
+            }
+        }
+        else Debug.LogWarning("UIManager: Navbar/PracticeMode 未找到");
+
+        // BtnBack（返回按钮）
+        var btnBack = navbar.Find("BtnBack");
+        if (btnBack != null)
+        {
+            var btn = btnBack.GetComponent<Button>();
+            if (btn != null)
+            {
+                btn.onClick.AddListener(OnReturnClicked);
+                Debug.Log("UIManager: Navbar/BtnBack 绑定成功 -> OnReturnClicked");
+            }
+        }
+        else Debug.LogWarning("UIManager: Navbar/BtnBack 未找到");
+
+        Debug.Log("--- UIManager: Navbar 按钮绑定完成 ---");
+    }
+
+    #endregion
+
     #region 事件绑定
 
     private void BindEvents()
@@ -78,17 +181,54 @@ public class UIManager : MonoBehaviour
         _stepManager.OnExamPopup.AddListener(ShowExamPopup);
         _stepManager.OnExperimentComplete.AddListener(OnExperimentComplete);
         _stepManager.OnVideoToggle.AddListener(ToggleVideo);
+        Debug.Log("UIManager: StepManager 事件绑定完成");
     }
 
     private void BindButtons()
     {
-        if (_btnFullScreen) _btnFullScreen.onClick.AddListener(ToggleFullScreen);
-        if (_btnPrevious) _btnPrevious.onClick.AddListener(OnPreviousClicked);
-        if (_btnNext) _btnNext.onClick.AddListener(OnNextClicked);
-        if (_btnSwitchMode) _btnSwitchMode.onClick.AddListener(OnSwitchModeClicked);
-        if (_btnReturn) _btnReturn.onClick.AddListener(OnReturnClicked);
-        if (_btnLimbFixation) _btnLimbFixation.onClick.AddListener(() => _stepManager?.SwitchFixation(FixationMethod.LimbFixation));
-        if (_btnSplintFixation) _btnSplintFixation.onClick.AddListener(() => _stepManager?.SwitchFixation(FixationMethod.SplintFixation));
+        if (_btnFullScreen != null)
+        {
+            _btnFullScreen.onClick.AddListener(ToggleFullScreen);
+            Debug.Log("UIManager: _btnFullScreen 绑定成功");
+        }
+        if (_btnPrevious != null)
+        {
+            _btnPrevious.onClick.AddListener(OnPreviousClicked);
+            Debug.Log("UIManager: _btnPrevious 绑定成功");
+        }
+        if (_btnNext != null)
+        {
+            _btnNext.onClick.AddListener(OnNextClicked);
+            Debug.Log("UIManager: _btnNext 绑定成功");
+        }
+        if (_btnSwitchMode != null)
+        {
+            _btnSwitchMode.onClick.AddListener(OnSwitchModeClicked);
+            Debug.Log("UIManager: _btnSwitchMode 绑定成功");
+        }
+        if (_btnReturn != null)
+        {
+            _btnReturn.onClick.AddListener(OnReturnClicked);
+            Debug.Log("UIManager: _btnReturn 绑定成功");
+        }
+
+        if (_btnLimbFixation != null)
+        {
+            _btnLimbFixation.onClick.AddListener(() => {
+                Debug.Log("UIManager: [BtnLimbFixation] 点击 -> 肢体固定");
+                _stepManager?.SwitchFixation(FixationMethod.LimbFixation);
+            });
+            Debug.Log("UIManager: _btnLimbFixation 绑定成功");
+        }
+
+        if (_btnSplintFixation != null)
+        {
+            _btnSplintFixation.onClick.AddListener(() => {
+                Debug.Log("UIManager: [BtnSplintFixation] 点击 -> 夹板固定");
+                _stepManager?.SwitchFixation(FixationMethod.SplintFixation);
+            });
+            Debug.Log("UIManager: _btnSplintFixation 绑定成功");
+        }
     }
 
     #endregion
@@ -97,6 +237,7 @@ public class UIManager : MonoBehaviour
 
     private void OnStepChanged(int index)
     {
+        Debug.Log($"UIManager: [OnStepChanged] 步骤 = {index + 1}");
         UpdateProgressBar();
         UpdateNavigationButtons();
     }
@@ -121,6 +262,7 @@ public class UIManager : MonoBehaviour
 
     private void ToggleVideo(string fileName, bool active)
     {
+        Debug.Log($"UIManager: [ToggleVideo] file={fileName}, active={active}");
         if (_videoController == null) return;
         if (active && !string.IsNullOrEmpty(fileName))
             _videoController.PlayVideo(fileName);
@@ -140,8 +282,8 @@ public class UIManager : MonoBehaviour
     private void UpdateNavigationButtons()
     {
         if (_stepManager == null) return;
-        if (_btnPrevious) _btnPrevious.interactable = _stepManager.CurrentStepIndex > 0;
-        if (_btnNext)
+        if (_btnPrevious != null) _btnPrevious.interactable = _stepManager.CurrentStepIndex > 0;
+        if (_btnNext != null)
         {
             var label = _btnNext.GetComponentInChildren<Text>();
             bool isLast = _stepManager.CurrentStepIndex >= _stepManager.TotalSteps - 1;
@@ -155,12 +297,14 @@ public class UIManager : MonoBehaviour
 
     private void ShowExamPopup(StepData step)
     {
+        Debug.Log($"UIManager: [ShowExamPopup] 题目={step.ExamQuestionText}");
         if (_examPopup == null) return;
         _examPopup.Show(step, OnExamAnswer);
     }
 
     private void OnExamAnswer(float proportion, string feedback)
     {
+        Debug.Log($"UIManager: [OnExamAnswer] proportion={proportion}, feedback={feedback}");
         _stepManager?.OnStepInteractionComplete(proportion, feedback);
         _stepManager?.NextStep();
     }
@@ -171,6 +315,7 @@ public class UIManager : MonoBehaviour
 
     private void OnExperimentComplete()
     {
+        Debug.Log("UIManager: [OnExperimentComplete] 实验完成");
         var gm = GameManager.Instance;
         if (gm == null) return;
         if (gm.CurrentMode == ExperimentMode.Exam)
@@ -186,15 +331,18 @@ public class UIManager : MonoBehaviour
     private void ToggleFullScreen()
     {
         Screen.fullScreen = !Screen.fullScreen;
+        Debug.Log($"UIManager: [ToggleFullScreen] 全屏 = {Screen.fullScreen}");
     }
 
     private void OnPreviousClicked()
     {
+        Debug.Log("UIManager: [OnPreviousClicked] -> 上一步");
         _stepManager?.PreviousStep();
     }
 
     private void OnNextClicked()
     {
+        Debug.Log("UIManager: [OnNextClicked] -> 下一步");
         if (_stepManager != null && _stepManager.Mode == ExperimentMode.Exam)
         {
             var step = _stepManager.GetCurrentStep();
@@ -207,18 +355,20 @@ public class UIManager : MonoBehaviour
     private void OnSwitchModeClicked()
     {
         if (_stepManager == null) return;
-        var newMode = _stepManager.Mode == ExperimentMode.Learn
-            ? ExperimentMode.Exam : ExperimentMode.Learn;
+        var oldMode = _stepManager.Mode;
+        var newMode = oldMode == ExperimentMode.Learn ? ExperimentMode.Exam : ExperimentMode.Learn;
+        Debug.Log($"UIManager: [OnSwitchModeClicked] 切换 {oldMode} -> {newMode}");
         _stepManager.SwitchMode(newMode);
     }
 
     private void OnReturnClicked()
     {
+        Debug.Log("UIManager: [OnReturnClicked] -> 返回首页");
         var pageCtrl = FindObjectOfType<PageController>();
         if (pageCtrl != null)
             pageCtrl.ReturnToHome();
         else
-            Debug.LogWarning("UIManager: 未找到 PageController，无法返回首页。");
+            Debug.LogWarning("UIManager: 未找到 PageController。");
     }
 
     #endregion