diff --git a/src/ui/components/card_node.gd b/src/ui/components/card_node.gd
index 6039156..52b80c4 100644
--- a/src/ui/components/card_node.gd
+++ b/src/ui/components/card_node.gd
@@ -11,28 +11,28 @@ var is_selected: bool = false
 @onready var label: Label = $Label
 
 func setup(card: Card) -> void:
-    card_data = card
-    update_display()
+	card_data = card
+	update_display()
 
 func update_display() -> void:
-    if card_data == null:
-        return
-    var suits := ["S", "H", "C", "D", "SJ", "BJ"]
-    var ranks := ["", "", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", "SJ", "BJ"]
-    var suit := card_data.suit()
-    var rank := card_data.rank()
-    if rank < ranks.size() and suit < suits.size():
-        label.text = "%s %s" % [suits[suit], ranks[rank]]
-    modulate = Color.WHITE if not is_selected else Color(1.2, 1.2, 0.8)
+	if card_data == null:
+		return
+	var suits := ["S", "H", "C", "D", "SJ", "BJ"]
+	var ranks := ["", "", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", "SJ", "BJ"]
+	var suit := card_data.suit()
+	var rank := card_data.rank()
+	if rank < ranks.size() and suit < suits.size() and label:
+		label.text = "%s %s" % [suits[suit], ranks[rank]]
+	modulate = Color.WHITE if not is_selected else Color(1.2, 1.2, 0.8)
 
 func set_selected(sel: bool) -> void:
-    is_selected = sel
-    update_display()
+	is_selected = sel
+	update_display()
 
 func _on_gui_input(event: InputEvent) -> void:
-    if event is InputEventMouseButton:
-        if event.button_index == MOUSE_BUTTON_LEFT and event.pressed:
-            if event.double_click:
-                card_double_clicked.emit(self)
-            else:
-                card_clicked.emit(self)
+	if event is InputEventMouseButton:
+		if event.button_index == MOUSE_BUTTON_LEFT and event.pressed:
+			if event.double_click:
+				card_double_clicked.emit(self)
+			else:
+				card_clicked.emit(self)
diff --git a/src/ui/scenes/main_menu.gd b/src/ui/scenes/main_menu.gd
index b1696a8..d0418ca 100644
--- a/src/ui/scenes/main_menu.gd
+++ b/src/ui/scenes/main_menu.gd
@@ -1,13 +1,13 @@
 extends Control
 
 func _ready() -> void:
-	var start_btn := $VBoxContainer/StartButton as Button
-	var quit_btn := $VBoxContainer/QuitButton as Button
-	start_btn.pressed.connect(_on_start_pressed)
-	quit_btn.pressed.connect(_on_quit_pressed)
+    var start_btn := $VBoxContainer/StartButton as Button
+    var quit_btn := $VBoxContainer/QuitButton as Button
+    start_btn.pressed.connect(_on_start_pressed)
+    quit_btn.pressed.connect(_on_quit_pressed)
 
 func _on_start_pressed() -> void:
-	get_tree().change_scene_to_file("res://src/ui/scenes/training_room.tscn")
+    get_tree().change_scene_to_file("res://src/ui/scenes/training_room.tscn")
 
 func _on_quit_pressed() -> void:
-	get_tree().quit()
+    get_tree().quit()
diff --git a/src/ui/scenes/training_room.gd b/src/ui/scenes/training_room.gd
index 55c32c4..dda6325 100644
--- a/src/ui/scenes/training_room.gd
+++ b/src/ui/scenes/training_room.gd
@@ -26,18 +26,20 @@ func start_training() -> void:
 func _on_turn_ready(player_idx: int, is_human: bool) -> void:
 	if is_human:
 		hand_area.enable_input()
-		status_label.text = "你的回合"
+		if status_label: status_label.text = "你的回合"
 	else:
 		hand_area.disable_input()
-		status_label.text = "%s 思考中..." % controller.game_state.player_names[player_idx]
+		if status_label and controller and controller.game_state:
+			status_label.text = "%s 思考中..." % controller.game_state.player_names[player_idx]
 
 func _on_play_pressed() -> void:
+	if not hand_area: return
 	var selected := hand_area.selected_cards
 	if selected.is_empty():
 		return
 	var result := controller.handle_human_play(selected)
 	if not result.ok:
-		status_label.text = "无效出牌"
+		if status_label: status_label.text = "无效出牌"
 		return
 	hand_area.clear_selection()
 	_refresh_ui()
@@ -45,27 +47,28 @@ func _on_play_pressed() -> void:
 func _on_pass_pressed() -> void:
 	var result := controller.handle_human_pass()
 	if not result.ok:
-		status_label.text = "不能过牌"
+		if status_label: status_label.text = "不能过牌"
 		return
 	_refresh_ui()
 
 func _on_hint_pressed() -> void:
 	var hint := controller.get_hint()
 	if hint == null or hint.type == -1:
-		status_label.text = "建议：过牌"
+		if status_label: status_label.text = "建议：过牌"
 		return
+	if not hand_area: return
 	hand_area.clear_selection()
 	for card in hint.cards:
 		for cn in hand_area.card_nodes:
 			if cn.card_data != null and cn.card_data.card_id == card.card_id:
 				cn.set_selected(true)
 				hand_area.selected_cards.append(card)
-	status_label.text = "建议牌型: %s (rank=%d)" % [hint.type, hint.primary_rank]
+	if status_label: status_label.text = "建议牌型: %s (rank=%d)" % [hint.type, hint.primary_rank]
 
 func _on_game_ended(winner_team: int, reason: String) -> void:
-	status_label.text = "游戏结束! 队伍 %d 获胜" % winner_team
-	hand_area.disable_input()
+	if status_label: status_label.text = "游戏结束! 队伍 %d 获胜" % winner_team
+	if hand_area: hand_area.disable_input()
 
 func _refresh_ui() -> void:
-	if controller and controller.game_state:
+	if controller and controller.game_state and hand_area:
 		hand_area.update_hand(controller.game_state.get_hand(0))