Update

Assets/Scripts/UI/HUDController.cs

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+using UnityEngine;
+using UnityEngine.UIElements;
+using OnlyScove.Scripts;
+
+namespace UI
+{
+    public class HUDController : MonoBehaviour
+    {
+        [Header("UI Document")]
+        public UIDocument hudDocument;
+
+        private VisualElement _healthFill;
+        private VisualElement _staminaFill;
+        private Label _healthText;
+        private Label _noiseLabel;
+        private Label _interactionLabel;
+        private VisualElement _interactionPrompt;
+
+        private void OnEnable()
+        {
+            if (hudDocument == null)
+                hudDocument = GetComponent<UIDocument>();
+
+            var root = hudDocument.rootVisualElement;
+
+            // Tìm các thành phần UI theo Name (Bạn cần đặt tên này trong UXML)
+            _healthFill = root.Q<VisualElement>("health-fill");
+            _staminaFill = root.Q<VisualElement>("stamina-fill");
+            _healthText = root.Q<Label>("health-text");
+            _noiseLabel = root.Q<Label>("noise-label");
+            _interactionLabel = root.Q<Label>("interaction-text");
+            _interactionPrompt = root.Q<VisualElement>("interaction-prompt");
+        }
+
+        private void Update()
+        {
+            // Kết nối với Local Player
+            if (PlayerStateMachine.Local != null)
+            {
+                SubscribeToPlayer(PlayerStateMachine.Local);
+            }
+        }
+
+        private PlayerStateMachine _currentPlayer;
+
+        private void SubscribeToPlayer(PlayerStateMachine player)
+        {
+            if (_currentPlayer == player) return;
+
+            // Hủy đăng ký player cũ nếu có
+            if (_currentPlayer != null)
+            {
+                _currentPlayer.OnHealthChanged -= UpdateHealth;
+                _currentPlayer.OnStaminaChanged -= UpdateStamina;
+                _currentPlayer.OnNoiseLevelChanged -= UpdateNoise;
+                _currentPlayer.OnInteractableTargetChanged -= UpdateInteraction;
+            }
+
+            _currentPlayer = player;
+
+            // Đăng ký player mới
+            _currentPlayer.OnHealthChanged += UpdateHealth;
+            _currentPlayer.OnStaminaChanged += UpdateStamina;
+            _currentPlayer.OnNoiseLevelChanged += UpdateNoise;
+            _currentPlayer.OnInteractableTargetChanged += UpdateInteraction;
+
+            // Cập nhật giá trị ban đầu
+            UpdateHealth(_currentPlayer.Health);
+            UpdateStamina(_currentPlayer.Stamina);
+            UpdateNoise(_currentPlayer.NoiseLevel);
+        }
+
+        private void UpdateHealth(float health)
+        {
+            if (_healthFill != null) _healthFill.style.width = Length.Percent(health);
+            if (_healthText != null) _healthText.text = $"HEALTH: {Mathf.RoundToInt(health)}/100";
+        }
+
+        private void UpdateStamina(float stamina)
+        {
+            if (_staminaFill != null) _staminaFill.style.width = Length.Percent(stamina);
+        }
+
+        private void UpdateNoise(float noise)
+        {
+            if (_noiseLabel != null) _noiseLabel.text = $"NOISE: {Mathf.RoundToInt(noise)}%";
+        }
+
+        private void UpdateInteraction(IInteractable interactable)
+        {
+            if (_interactionPrompt == null) return;
+
+            if (interactable != null)
+            {
+                _interactionPrompt.style.display = DisplayStyle.Flex;
+                if (_interactionLabel != null) _interactionLabel.text = interactable.InteractionPrompt;
+            }
+            else
+            {
+                _interactionPrompt.style.display = DisplayStyle.None;
+            }
+        }
+    }
+}

Assets/Scripts/UI/HUDController.cs.meta

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+fileFormatVersion: 2
+guid: e79b70607af6eeb458c8eb6605e39b56

Assets/Scripts/UI/UIManager.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace UI
+{
+    [ExecuteAlways]
+    public class UIManager : MonoBehaviour
+    {
+        [Serializable]
+        public class ScreenData
+        {
+            public string screenName;
+            public UIDocument document;
+            public bool isActive;
+        }
+
+        [Header("Screens Management")]
+        public List<ScreenData> screens = new List<ScreenData>();
+        
+        [Header("Live Preview (Editor Only)")]
+        [Range(0, 1)] public float globalOpacity = 1f;
+
+        private void OnValidate()
+        {
+            // Tự động cập nhật giao diện ngay khi thay đổi thông số trong Inspector (không cần Play)
+            SyncScreens();
+        }
+
+        private void OnEnable()
+        {
+            if (Application.isPlaying)
+            {
+                SetupEvents();
+            }
+            SyncScreens();
+        }
+
+        public void SyncScreens()
+        {
+            foreach (var screen in screens)
+            {
+                if (screen.document == null) continue;
+                
+                var root = screen.document.rootVisualElement;
+                if (root == null) continue;
+
+                // Bật tắt display dựa trên biến isActive
+                root.style.display = screen.isActive ? DisplayStyle.Flex : DisplayStyle.None;
+                root.style.opacity = globalOpacity;
+            }
+        }
+
+        // Hàm tiện ích để bật duy nhất 1 màn hình từ Code hoặc Button
+        public void ShowOnly(string name)
+        {
+            foreach (var screen in screens)
+            {
+                screen.isActive = (screen.screenName == name);
+            }
+            SyncScreens();
+        }
+
+        private void SetupEvents()
+        {
+            // Logic đăng ký event thông minh ở đây (tương tự như trước nhưng linh hoạt hơn)
+            var mainMenu = GetDocument("MainMenu");
+            if (mainMenu != null)
+            {
+                mainMenu.rootVisualElement.Q<Button>("btn-settings")?.RegisterCallback<ClickEvent>(e => ShowOnly("Settings"));
+                mainMenu.rootVisualElement.Q<Button>("btn-create")?.RegisterCallback<ClickEvent>(e => ShowOnly("Lobby"));
+            }
+            
+            var settings = GetDocument("Settings");
+            settings?.rootVisualElement.Q<Button>("btn-back")?.RegisterCallback<ClickEvent>(e => ShowOnly("MainMenu"));
+        }
+
+        public UIDocument GetDocument(string name)
+        {
+            return screens.Find(s => s.screenName == name)?.document;
+        }
+
+        // Thêm hàm để Update Text/Image nhanh từ Inspector hoặc Script khác
+        public void SetElementText(string screenName, string elementName, string newText)
+        {
+            var doc = GetDocument(screenName);
+            var label = doc?.rootVisualElement.Q<Label>(elementName);
+            if (label != null) label.text = newText;
+        }
+    }
+}

Assets/Scripts/UI/UIManager.cs.meta

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+fileFormatVersion: 2
+guid: bcb7b8ed439bb4546b0648c627c2ce5d