diff --git a/scenes/main/combat_s2.gd b/scenes/main/combat_s2.gd
index 086ac62..8c74630 100644
--- a/scenes/main/combat_s2.gd
+++ b/scenes/main/combat_s2.gd
@@ -102,6 +102,13 @@ func _process(delta: float) -> void:
 		_dps_poll_timer = 0.5
 		if _lbl_dps:
 			_lbl_dps.text = tr("UI_DPS") % DpsTracker.get_dps()
+	# 无敌帧闪烁反馈：8Hz 方波（相位来自系统时钟，避免累加状态）
+	if _player_node:
+		if PlayerStats.is_invulnerable():
+			var on: bool = (Time.get_ticks_msec() / 62) % 2 == 0   # ≈8Hz（62ms 半周期）
+			_player_node.modulate.a = 1.0 if on else 0.35
+		elif _player_node.modulate.a != 1.0:
+			_player_node.modulate.a = 1.0   # 窗口结束确保恢复不透明
 
 # ── 初始化 ─────────────────────────────────────────────────