Update

Assets/Scripts/UI/LobbyController.cs

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+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace UI
+{
+    public class LobbyController : MonoBehaviour
+    {
+        private UIDocument _doc;
+        private Button _btnLeave;
+        private Button _btnStart;
+        private ScrollView _playerList;
+
+        private void OnEnable()
+        {
+            _doc = GetComponent<UIDocument>();
+            var root = _doc.rootVisualElement;
+
+            // BINDING: Tìm element theo tên (Name) đã đặt trong UXML
+            _btnLeave = root.Q<Button>("btn-leave");
+            _btnStart = root.Q<Button>("btn-start");
+            _playerList = root.Q<ScrollView>("player-list");
+
+            // ĐĂNG KÝ SỰ KIỆN:
+            if (_btnLeave != null)
+                _btnLeave.clicked += OnLeaveClicked;
+
+            if (_btnStart != null)
+                _btnStart.clicked += OnStartClicked;
+        }
+
+        private void OnLeaveClicked()
+        {
+            Debug.Log("User clicked LEAVE room!");
+            UIManager.Instance.ShowScreen("MainMenu");
+        }
+
+        private void OnStartClicked()
+        {
+            Debug.Log("Host clicked START GAME!");
+            UIManager.Instance.ShowScreen("HUD"); // Chuyển vào HUD khi game bắt đầu
+        }
+
+        private void OnDisable()
+        {
+            // Hủy đăng ký để tránh memory leak
+            if (_btnLeave != null) _btnLeave.clicked -= OnLeaveClicked;
+            if (_btnStart != null) _btnStart.clicked -= OnStartClicked;
+        }
+    }
+}