import {
  _decorator,
  AudioClip,
  AudioSource,
  Camera,
  Canvas,
  Color,
  Component,
  EventKeyboard,
  EventMouse,
  EventTouch,
  Graphics,
  ImageAsset,
  input,
  Input,
  KeyCode,
  Label,
  Layers,
  Node,
  resources,
  ResolutionPolicy,
  Sprite,
  SpriteFrame,
  UIOpacity,
  UITransform,
  Vec3,
  view
} from 'cc';
import { HP_PANEL_DATA_URI, LEVEL1_BACKGROUND_DATA_URI } from './generatedLevelArtV2';

const { ccclass, property } = _decorator;

type WeaponId = 'rifle' | 'flame' | 'rail';
type EnemyType = 'spore' | 'wing' | 'turret' | 'boss';
type AudioId = 'bgm_level1_loop' | 'shot_rifle' | 'shot_flame' | 'shot_rail' | 'jump' | 'switch_weapon' | 'boss_alert';
type MobileAction = 'left' | 'right' | 'up' | 'fire' | 'switch';

interface Enemy {
  type: EnemyType;
  x: number;
  y: number;
  hp: number;
  maxHp: number;
  vx: number;
  cd: number;
}

interface Obstacle {
  x: number;
  y: number;
  width: number;
  height: number;
}

interface UiRect {
  x: number;
  y: number;
  width: number;
  height: number;
}

interface Bullet {
  x: number;
  y: number;
  vx: number;
  vy: number;
  life: number;
  damage: number;
  player: boolean;
  pierce: boolean;
  kind: WeaponId | 'enemy';
  homing?: boolean;
  hitEnemies?: Set<Enemy>;
}

const W = 1280;
const H = 720;
const SCALE = H / 540;
const U = (value: number) => Math.round(value * SCALE);
const US = (value: number) => value * SCALE;
const GROUND = U(-174);
const LANE_Y = GROUND + U(62);
const BOSS_Y = LANE_Y + U(76);
const END_X = U(3320);
const ACTOR_RENDER_Y_OFFSET = 0;
const VISUAL_LANE_Y = LANE_Y + ACTOR_RENDER_Y_OFFSET;
const ENEMY_BULLET_HIT_RADIUS = U(24);
const BOSS_MAX_HP = 300;
const BOSS_PHASE_TWO_RATIO = 0.6;
const BOSS_ENRAGE_RATIO = 0.2;

const WEAPONS = {
  rifle: { name: 'RIFLE', cd: 0.11, damage: 4, speed: U(880) },
  flame: { name: 'FLAME', cd: 0.055, damage: 1.4, speed: U(520) },
  rail: { name: 'RAIL', cd: 0.58, damage: 5, speed: U(1250) }
};

function enemyVisualProjectileOffset(type: EnemyType) {
  if (type === 'boss') return U(18);
  return U(8);
}

@ccclass('SteelAssaultGame')
export class SteelAssaultGame extends Component {
  @property
  autoStart = true;

  private cameraNode = new Node('RuntimeCamera');
  private backgroundLayer = new Node('RuntimeBackground');
  private renderNode = new Node('RuntimeGraphics');
  private spriteLayer = new Node('RuntimeSprites');
  private propLayer = new Node('RuntimeProps');
  private uiArtLayer = new Node('RuntimeUIArt');
  private outcomeButtonLayer = new Node('RuntimeOutcomeButtons');
  private hudNode = new Node('RuntimeHUD');
  private graphics!: Graphics;
  private outcomeButtonGraphics!: Graphics;
  private hud!: Label;
  private hpHud!: Label;
  private scoreHud!: Label;
  private weaponHud!: Label;
  private outcomeTitle!: Label;
  private outcomeStats!: Label;
  private outcomeAction!: Label;
  private outcomeNextAction!: Label;
  private outcomeRestartAction!: Label;
  private keys = new Set<KeyCode>();
  private weapon: WeaponId = 'rifle';
  private player = { x: U(-360), y: LANE_Y, vx: 0, vy: 0, hp: 6, face: 1, grounded: true };
  private previousPlayerY = LANE_Y;
  private enemies: Enemy[] = [];
  private bullets: Bullet[] = [];
  private spawned = new Set<number>();
  private boss: Enemy | null = null;
  private fireCd = 0;
  private mercy = 0;
  private cameraX = 0;
  private score = 0;
  private state: 'playing' | 'win' | 'next' | 'lose' = 'playing';
  private bossTime = 0;
  private bossEnrageAnnounced = false;
  private bossRoarTimer = 0;
  private elapsed = 0;
  private spritesReady = false;
  private heroSprite: Sprite | null = null;
  private enemySprites = new Map<Enemy, Sprite>();
  private bulletSprites = new Map<Bullet, Sprite>();
  private obstacleSprites = new Map<Obstacle, Sprite>();
  private heroFrames: SpriteFrame[] = [];
  private sporeFrames: SpriteFrame[] = [];
  private wingFrames: SpriteFrame[] = [];
  private turretFrames: SpriteFrame[] = [];
  private bossFrames: SpriteFrame[] = [];
  private projectileFrames: SpriteFrame[] = [];
  private sceneFrames = new Map<string, SpriteFrame>();
  private uiFrames = new Map<string, SpriteFrame>();
  private backgroundSprite: Sprite | null = null;
  private backgroundSprites: Sprite[] = [];
  private failOverlaySprite: Sprite | null = null;
  private outcomePanelSprite: Sprite | null = null;
  private hpPanelSprite: Sprite | null = null;
  private weaponSprite: Sprite | null = null;
  private heroWeaponSprite: Sprite | null = null;
  private weaponSlotSprites = new Map<WeaponId, Sprite>();
  private touchLeftSprite: Sprite | null = null;
  private touchRightSprite: Sprite | null = null;
  private touchJumpSprite: Sprite | null = null;
  private touchFireSprite: Sprite | null = null;
  private touchSwitchSprite: Sprite | null = null;
  private retrySprite: Sprite | null = null;
  private hpSprites: Sprite[] = [];
  private propSprites: Array<{ sprite: Sprite; worldX: number; y: number; scale: number }> = [];
  private createdProps = new Set<string>();
  private weaponSwitchTimer = 0;
  private musicSource!: AudioSource;
  private sfxSource!: AudioSource;
  private audioClips = new Map<AudioId, AudioClip>();
  private audioUnlocked = false;
  private musicStarted = false;
  private mobileLeft = false;
  private mobileRight = false;
  private mobileUp = false;
  private mobileDown = false;
  private mobileFire = false;
  private joystickTilt = { x: 0, y: 0 };
  private pointerActions = new Map<number, MobileAction>();
  private switchInputLock = 0;
  private viewportWidth = W;
  private sceneReady = false;

  private waves = [
    { x: U(420) },
    { x: U(860) },
    { x: U(1280) },
    { x: U(1680) },
    { x: U(2200) },
    { x: U(2700) }
  ];
  private obstacles: Obstacle[] = [
    { x: U(520), y: LANE_Y, width: U(118), height: U(58) },
    { x: U(1120), y: LANE_Y, width: U(138), height: U(72) },
    { x: U(2220), y: LANE_Y, width: U(132), height: U(64) },
    { x: U(2600), y: LANE_Y + U(8), width: U(132), height: U(58) },
    { x: U(2760), y: LANE_Y + U(78), width: U(126), height: U(56) },
    { x: U(2940), y: LANE_Y + U(48), width: U(132), height: U(58) },
    { x: U(3100), y: LANE_Y + U(132), width: U(138), height: U(56) },
    { x: U(3190), y: LANE_Y + U(82), width: U(132), height: U(72) }
  ];

  onLoad() {
    console.log('[SteelAssaultGame] boot');
    this.bootstrapScene();
    input.on(Input.EventType.KEY_DOWN, this.onKeyDown, this);
    input.on(Input.EventType.KEY_UP, this.onKeyUp, this);
    input.on(Input.EventType.TOUCH_START, this.onTouchStart, this);
    input.on(Input.EventType.TOUCH_MOVE, this.onTouchMove, this);
    input.on(Input.EventType.TOUCH_END, this.onTouchEnd, this);
    input.on(Input.EventType.TOUCH_CANCEL, this.onTouchEnd, this);
    input.on(Input.EventType.MOUSE_DOWN, this.onMouseDown, this);
    input.on(Input.EventType.MOUSE_MOVE, this.onMouseMove, this);
    input.on(Input.EventType.MOUSE_UP, this.onMouseUp, this);
  }

  onDestroy() {
    view.setResizeCallback(null);
    input.off(Input.EventType.KEY_DOWN, this.onKeyDown, this);
    input.off(Input.EventType.KEY_UP, this.onKeyUp, this);
    input.off(Input.EventType.TOUCH_START, this.onTouchStart, this);
    input.off(Input.EventType.TOUCH_MOVE, this.onTouchMove, this);
    input.off(Input.EventType.TOUCH_END, this.onTouchEnd, this);
    input.off(Input.EventType.TOUCH_CANCEL, this.onTouchEnd, this);
    input.off(Input.EventType.MOUSE_DOWN, this.onMouseDown, this);
    input.off(Input.EventType.MOUSE_MOVE, this.onMouseMove, this);
    input.off(Input.EventType.MOUSE_UP, this.onMouseUp, this);
  }

  update(dt: number) {
    this.elapsed += dt;
     if (this.state === 'playing') {
    this.updatePlayer(dt);
    this.updateObstacleHits();
    this.updateWaves();
    this.updateEnemies(dt);
    this.updateBullets(dt);
    this.weaponSwitchTimer = Math.max(0, this.weaponSwitchTimer - dt);
    this.switchInputLock = Math.max(0, this.switchInputLock - dt);
    this.cameraX = Math.max(0, Math.min(END_X - 600, this.player.x - 120));
    }
    this.draw();
  }

  private bootstrapScene() {
    this.hideBootCanvas();

    this.node.layer = Layers.Enum.UI_2D;
   
    const transform = this.node.getComponent(UITransform) ?? this.node.addComponent(UITransform);
    transform.setContentSize(this.viewportWidth, H);

    const canvas = this.node.getComponent(Canvas) ?? this.node.addComponent(Canvas);
    canvas.alignCanvasWithScreen = true;
    this.node.addChild(this.cameraNode);
    this.cameraNode.layer = Layers.Enum.UI_2D;
    this.cameraNode.setPosition(0, 0, 1000);
    const camera = this.cameraNode.addComponent(Camera);
    //camera.orthoHeight = H / 2;
    camera.visibility = Layers.Enum.UI_2D;
    camera.clearColor = new Color(7, 12, 24, 255);
    canvas.cameraComponent = camera;

    const musicNode = new Node('RuntimeMusic');
    musicNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(musicNode);
    this.musicSource = musicNode.addComponent(AudioSource);
    this.musicSource.loop = true;
    this.musicSource.volume = 0.34;

    const sfxNode = new Node('RuntimeSfx');
    sfxNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(sfxNode);
    this.sfxSource = sfxNode.addComponent(AudioSource);
    this.sfxSource.volume = 0.9;

    this.node.addChild(this.backgroundLayer);
    this.backgroundLayer.layer = Layers.Enum.UI_2D;
    this.backgroundLayer.addComponent(UITransform).setContentSize(this.viewportWidth, H);

    this.node.addChild(this.renderNode);
    this.renderNode.layer = Layers.Enum.UI_2D;
    this.renderNode.addComponent(UITransform).setContentSize(this.viewportWidth, H);
    this.graphics = this.renderNode.addComponent(Graphics);

    this.node.addChild(this.propLayer);
    this.propLayer.layer = Layers.Enum.UI_2D;
    this.propLayer.addComponent(UITransform).setContentSize(this.viewportWidth, H);

    this.node.addChild(this.spriteLayer);
    this.spriteLayer.layer = Layers.Enum.UI_2D;
    this.spriteLayer.addComponent(UITransform).setContentSize(this.viewportWidth, H);

    this.node.addChild(this.uiArtLayer);
    this.uiArtLayer.layer = Layers.Enum.UI_2D;
    this.uiArtLayer.addComponent(UITransform).setContentSize(this.viewportWidth, H);

    this.node.addChild(this.outcomeButtonLayer);
    this.outcomeButtonLayer.layer = Layers.Enum.UI_2D;
    this.outcomeButtonLayer.addComponent(UITransform).setContentSize(this.viewportWidth, H);
    this.outcomeButtonGraphics = this.outcomeButtonLayer.addComponent(Graphics);
    this.bindOutcomeRestartNode(this.outcomeButtonLayer);

    this.node.addChild(this.hudNode);
    this.hudNode.layer = Layers.Enum.UI_2D;
    this.hudNode.addComponent(UITransform).setContentSize(W, U(64));
    this.hudNode.setPosition(0, H / 2 - U(34), 0);
    this.hud = this.hudNode.addComponent(Label);
    this.hud.fontSize = 22;
    this.hud.lineHeight = 28;
    this.hud.color = new Color(230, 250, 255, 255);
    this.hud.string = 'STEEL ASSAULT';

    const half = this.visibleWorldWidth() / 2;
    const hpNode = new Node('HpHud');
    hpNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(hpNode);
    hpNode.addComponent(UITransform).setContentSize(U(210), U(52));
    hpNode.setPosition(-half + U(112), H / 2 - U(30), 8);
    this.hpHud = hpNode.addComponent(Label);
    this.hpHud.fontSize = 30;
    this.hpHud.lineHeight = 34;
    this.hpHud.color = new Color(255, 255, 255, 255);

    const scoreNode = new Node('ScoreHud');
    scoreNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(scoreNode);
    scoreNode.addComponent(UITransform).setContentSize(U(300), U(52));
    scoreNode.setPosition(half - U(126), H / 2 - U(30), 8);
    this.scoreHud = scoreNode.addComponent(Label);
    this.scoreHud.fontSize = 30;
    this.scoreHud.lineHeight = 34;
    this.scoreHud.color = new Color(255, 244, 165, 255);

    const weaponNode = new Node('WeaponHud');
    weaponNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(weaponNode);
    weaponNode.addComponent(UITransform).setContentSize(U(276), U(28));
    weaponNode.setPosition(half - U(126), H / 2 - U(60), 24);
    this.weaponHud = weaponNode.addComponent(Label);
    this.weaponHud.fontSize = 16;
    this.weaponHud.lineHeight = 20;
    this.weaponHud.color = new Color(230, 255, 255, 255);

    const outcomeTitleNode = new Node('OutcomeTitle');
    outcomeTitleNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(outcomeTitleNode);
    outcomeTitleNode.addComponent(UITransform).setContentSize(U(720), U(72));
    outcomeTitleNode.setPosition(0, U(70), 28);
    this.outcomeTitle = outcomeTitleNode.addComponent(Label);
    this.outcomeTitle.fontSize = 46;
    this.outcomeTitle.lineHeight = 54;
    this.outcomeTitle.color = new Color(255, 244, 168, 255);

    const outcomeStatsNode = new Node('OutcomeStats');
    outcomeStatsNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(outcomeStatsNode);
    outcomeStatsNode.addComponent(UITransform).setContentSize(U(720), U(56));
    outcomeStatsNode.setPosition(0, U(10), 28);
    this.outcomeStats = outcomeStatsNode.addComponent(Label);
    this.outcomeStats.fontSize = 28;
    this.outcomeStats.lineHeight = 34;
    this.outcomeStats.color = new Color(225, 250, 255, 255);

    const outcomeActionNode = new Node('OutcomeAction');
    outcomeActionNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(outcomeActionNode);
    outcomeActionNode.addComponent(UITransform).setContentSize(U(620), U(90));
    outcomeActionNode.setPosition(0, U(-92), 28);
    this.outcomeAction = outcomeActionNode.addComponent(Label);
    this.outcomeAction.fontSize = 28;
    this.outcomeAction.lineHeight = 36;
    this.outcomeAction.color = new Color(14, 29, 36, 255);

    const outcomeNextNode = new Node('OutcomeNextAction');
    outcomeNextNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(outcomeNextNode);
    outcomeNextNode.addComponent(UITransform).setContentSize(U(220), U(64));
    outcomeNextNode.setPosition(U(-126), U(-100), 30);
    this.outcomeNextAction = outcomeNextNode.addComponent(Label);
    this.outcomeNextAction.fontSize = 26;
    this.outcomeNextAction.lineHeight = 32;
    this.outcomeNextAction.color = new Color(23, 32, 38, 255);

    const outcomeRestartNode = new Node('OutcomeRestartAction');
    outcomeRestartNode.layer = Layers.Enum.UI_2D;
    this.node.addChild(outcomeRestartNode);
    outcomeRestartNode.addComponent(UITransform).setContentSize(U(220), U(64));
    outcomeRestartNode.setPosition(U(126), U(-100), 30);
    this.outcomeRestartAction = outcomeRestartNode.addComponent(Label);
    this.outcomeRestartAction.fontSize = 26;
    this.outcomeRestartAction.lineHeight = 32;
    this.outcomeRestartAction.color = new Color(235, 252, 255, 255);

    view.resizeWithBrowserSize(true);

  this.applyFullscreenLandscapeLayout();

   view.setResizeCallback(() => {
    this.applyFullscreenLandscapeLayout();
     this.draw();
  });

    this.loadSpriteSheets();
    this.loadSceneUiArt();
    this.loadAudioAssets();
    this.sceneReady = true;
    this.draw();
  }

  private hideBootCanvas() {
    const bootCanvas = this.node.scene?.getChildByName('BootCanvas');
    if (bootCanvas) bootCanvas.active = false;
  }

  private applyFullscreenLandscapeLayout() {
   // 横屏游戏标准方案：固定高度，宽度按屏幕比例自动扩展
  view.setDesignResolutionSize(W, H, ResolutionPolicy.FIXED_HEIGHT);

  const visible = view.getVisibleSize();
  const worldWidth = Math.max(W, visible.width || W);

  this.viewportWidth = worldWidth;

  const camera = this.cameraNode.getComponent(Camera);
  if (camera) {
    camera.orthoHeight = H / 2;
  }

  for (const node of [
    this.node,
    this.backgroundLayer,
    this.renderNode,
    this.propLayer,
    this.spriteLayer,
    this.uiArtLayer,
    this.hudNode
  ]) {
    const transform = node.getComponent(UITransform);
    if (transform) {
      transform.setContentSize(worldWidth, H);
    }
  }

  this.resizeFullscreenBackground();

  console.log(
    '[SteelAssaultGame] layout',
    'frame:', view.getFrameSize(),
    'visible:', view.getVisibleSize(),
    'viewport:', view.getViewportRect(),
    'worldWidth:', this.viewportWidth
  );
  }

  private resizeFullscreenBackground() {
    if (!this.backgroundSprite) return;
if (!this.backgroundSprite) return;

  const width = this.visibleWorldWidth();

  this.backgroundSprite.sizeMode = Sprite.SizeMode.CUSTOM;

  const transform = this.backgroundSprite.node.getComponent(UITransform);
  if (transform) {
    transform.setContentSize(width, H);
  }

  this.backgroundSprite.node.setPosition(0, 0, 0);
  this.backgroundSprite.node.setScale(new Vec3(1, 1, 1));
  }

  private loadSpriteSheets() {
    const hero = [
      'hero_idle',
      'hero_walk_1',
      'hero_walk_2',
      'hero_walk_3',
      'hero_walk_4',
      'hero_jump_rise',
      'hero_jump_fall'
    ];
    const enemies = [
      'spore_idle',
      'spore_walk_1',
      'spore_walk_2',
      'wing_idle',
      'wing_flap_1',
      'wing_flap_2',
      'turret_idle',
      'turret_aim',
      'turret_fire'
    ];
    const boss = [
      'boss_idle_closed',
      'boss_idle_pulse',
      'boss_attack_charge',
      'boss_core_enraged'
    ];
    const projectiles = [
      'rifle_1',
      'rifle_2',
      'rifle_3',
      'rifle_4',
      'flame_1',
      'flame_2',
      'flame_3',
      'flame_4',
      'rail_1',
      'rail_2',
      'acid_1',
      'acid_2',
      'acid_3',
      'acid_4'
    ];

    this.heroFrames = new Array<SpriteFrame>(hero.length);
    const enemyFrames = new Array<SpriteFrame>(enemies.length);
    this.bossFrames = new Array<SpriteFrame>(boss.length);
    this.projectileFrames = new Array<SpriteFrame>(projectiles.length);

    const jobs: Array<{ name: string; frames: SpriteFrame[]; index: number }> = [];
    hero.forEach((name, index) => jobs.push({ name, frames: this.heroFrames, index }));
    enemies.forEach((name, index) => jobs.push({ name, frames: enemyFrames, index }));
    boss.forEach((name, index) => jobs.push({ name, frames: this.bossFrames, index }));
    projectiles.forEach((name, index) => jobs.push({ name, frames: this.projectileFrames, index }));

    let pending = jobs.length;
    let failed = false;
    const done = () => {
      pending -= 1;
      if (pending === 0 && !failed) {
        this.sporeFrames = enemyFrames.slice(0, 3);
        this.wingFrames = enemyFrames.slice(3, 6);
        this.turretFrames = enemyFrames.slice(6, 9);
        this.spritesReady = true;
        console.log('[SteelAssaultGame] imagegen frame assets ready');
      }
    };

    for (const job of jobs) {
      resources.load(`sprites/imagegen/frames/${job.name}`, ImageAsset, (err, image) => {
        if (err || !image) {
          failed = true;
          console.warn(`[SteelAssaultGame] sprite frame fallback for ${job.name}`, err);
          done();
          return;
        }
        job.frames[job.index] = SpriteFrame.createWithImage(image);
        done();
      });
    }
  }

  private loadSceneUiArt() {
    this.loadDataUriFrame(LEVEL1_BACKGROUND_DATA_URI, (frame) => {
      this.sceneFrames.set('background', frame);
      this.backgroundSprites = [];
      const sprite = this.createSprite('Level1Background', this.backgroundLayer);
      sprite.spriteFrame = frame;
      sprite.sizeMode = Sprite.SizeMode.CUSTOM;
      sprite.node.getComponent(UITransform)?.setContentSize(this.visibleWorldWidth(), H);
      sprite.node.setPosition(0, 0, 0);
      sprite.node.setScale(new Vec3(1, 1, 1));
      const opacity = sprite.node.getComponent(UIOpacity) ?? sprite.node.addComponent(UIOpacity);
      opacity.opacity = 255;
      this.backgroundSprite = sprite;
      this.backgroundSprites.push(sprite);
      this.resizeFullscreenBackground();
    });
    this.loadDataUriFrame(HP_PANEL_DATA_URI, (frame) => {
      this.uiFrames.set('hp_numeric_plaque_v2', frame);
      this.hpPanelSprite = this.createSprite('HpNumericPanel', this.uiArtLayer);
      this.hpPanelSprite.spriteFrame = frame;
      this.hpPanelSprite.node.setPosition(-this.visibleWorldWidth() / 2 + 112, H / 2 - U(30), 6);
      this.hpPanelSprite.node.setScale(new Vec3(US(0.5), US(0.5), 1));
    });
    const ui = [
      'weapon_rifle',
      'weapon_flame',
      'weapon_rail',
      'retry_button',
      'outcome_fail_panel',
      'outcome_win_panel',
      'mobile_left',
      'mobile_right',
      'mobile_jump',
      'mobile_fire',
      'mobile_switch'
    ];
    for (const name of ui) {
      this.loadFrame(`sprites/imagegen/ui_scene/ui/${name}`, (frame) => this.uiFrames.set(name, frame));
    }
    this.loadFrame('sprites/imagegen/frames/obstacle_block', (frame) => this.uiFrames.set('obstacle_block', frame));
  }

  private loadFrame(path: string, use: (frame: SpriteFrame) => void) {
    resources.load(path, ImageAsset, (err, image) => {
      if (err || !image) {
        console.warn(`[SteelAssaultGame] art fallback for ${path}`, err);
        return;
      }
      use(SpriteFrame.createWithImage(image));
    });
  }

  private loadDataUriFrame(dataUri: string, use: (frame: SpriteFrame) => void) {
    const image = new Image();
    image.onload = () => {
      use(SpriteFrame.createWithImage(image));
    };
    image.onerror = () => {
      console.warn('[SteelAssaultGame] embedded image asset failed');
    };
    image.src = dataUri;
  }

  private loadAudioAssets() {
    const ids: AudioId[] = [
      'bgm_level1_loop',
      'shot_rifle',
      'shot_flame',
      'shot_rail',
      'jump',
      'switch_weapon',
      'boss_alert'
    ];
    for (const id of ids) {
      resources.load(`audio/${id}`, AudioClip, (err, clip) => {
        if (err || !clip) {
          console.warn(`[SteelAssaultGame] audio fallback for ${id}`, err);
          return;
        }
        this.audioClips.set(id, clip);
        if (id === 'bgm_level1_loop' && this.audioUnlocked) this.startMusic();
      });
    }
  }

  private unlockAudio() {
    this.audioUnlocked = true;
    this.startMusic();
  }

  private startMusic() {
    if (this.musicStarted || !this.musicSource) return;
    const clip = this.audioClips.get('bgm_level1_loop');
    if (!clip) return;
    this.musicSource.clip = clip;
    this.musicSource.loop = true;
    this.musicSource.volume = 0.34;
    this.musicSource.play();
    this.musicStarted = true;
  }

  private playSfx(id: AudioId, volume = 0.85) {
    const clip = this.audioClips.get(id);
    if (!clip || !this.sfxSource) return;
    this.sfxSource.playOneShot(clip, volume);
  }

  private updateBossEnrageAudio(enraged: boolean, dt: number) {
    if (!enraged) {
      this.bossEnrageAnnounced = false;
      this.bossRoarTimer = 0;
      return;
    }
    if (!this.bossEnrageAnnounced) {
      this.playSfx('boss_alert', 1.0);
      this.bossEnrageAnnounced = true;
      this.bossRoarTimer = 1.8;
      return;
    }
    this.bossRoarTimer -= dt;
    if (this.bossRoarTimer <= 0) {
      this.playSfx('boss_alert', 0.86);
      this.bossRoarTimer = 2.4;
    }
  }

  private updatePlayer(dt: number) {
    this.previousPlayerY = this.player.y;
    const left = this.keys.has(KeyCode.KEY_A) || this.keys.has(KeyCode.ARROW_LEFT);
    const right = this.keys.has(KeyCode.KEY_D) || this.keys.has(KeyCode.ARROW_RIGHT);
    const jump = this.keys.has(KeyCode.SPACE) || this.keys.has(KeyCode.KEY_W) || this.keys.has(KeyCode.ARROW_UP);
    const down = this.keys.has(KeyCode.KEY_S) || this.keys.has(KeyCode.ARROW_DOWN) || this.mobileDown;
    const moveLeft = left || this.mobileLeft;
    const moveRight = right || this.mobileRight;
    const fire = this.keys.has(KeyCode.KEY_J) || this.keys.has(KeyCode.ENTER) || this.mobileFire;

    this.player.vx = moveLeft === moveRight ? 0 : moveLeft ? -U(270) : U(270);
    if (this.player.vx !== 0) this.player.face = this.player.vx > 0 ? 1 : -1;
    if (jump || this.mobileUp) this.tryJump();
    if (down && !this.player.grounded) this.player.vy -= U(1700) * dt;

    this.player.vy -= U(1450) * dt;
    this.player.x = Math.max(U(-410), Math.min(END_X - U(180), this.player.x + this.player.vx * dt));
    this.player.y += this.player.vy * dt;
    if (this.player.y <= LANE_Y) {
      this.player.y = LANE_Y;
      this.player.vy = 0;
      this.player.grounded = true;
    }

    this.fireCd -= dt;
    this.mercy = Math.max(0, this.mercy - dt);
    if (fire) this.tryFire();
    if (this.player.x > U(3090) && !this.boss) this.spawnBoss();
  }

  private updateWaves() {
    for (let index = 0; index < this.waves.length; index++) {
      const wave = this.waves[index];
      const activeNormalEnemies = this.enemies.filter((enemy) => enemy.type !== 'boss').length;
      if (!this.spawned.has(index) && this.player.x > wave.x - U(520) && activeNormalEnemies === 0) {
        this.spawned.add(index);
        this.spawnEnemy(this.randomEnemyType(index), wave.x + U(120), index);
      }
    }
  }

  private randomEnemyType(_seed: number): Exclude<EnemyType, 'boss'> {
    return 'spore';
  }

  private updateObstacleHits() {
    const playerHalfWidth = U(22);
    const landingTolerance = U(14);
    for (const obstacle of this.obstacles) {
      const left = obstacle.x - obstacle.width / 2;
      const right = obstacle.x + obstacle.width / 2;
      const top = obstacle.y + obstacle.height;
      const horizontalOverlap = this.player.x + playerHalfWidth > left && this.player.x - playerHalfWidth < right;
      if (!horizontalOverlap) continue;

      const wasNearOrAboveTop = this.previousPlayerY >= top - landingTolerance;
      const crossedOrRestingOnTop = this.player.y <= top + landingTolerance && this.player.y >= top - landingTolerance;
      const fallingOntoTop = this.player.vy <= 0 && wasNearOrAboveTop && crossedOrRestingOnTop;
      const alreadyOnTop = this.player.grounded && Math.abs(this.player.y - top) <= landingTolerance;
      if (fallingOntoTop || alreadyOnTop) {
        this.player.y = top;
        this.player.vy = 0;
        this.player.grounded = true;
        return;
      }

      const nearObstacleBody = this.player.y < top - U(10) && this.player.y > obstacle.y - U(4);
      if (nearObstacleBody) {
        const pushLeft = Math.abs(this.player.x - left);
        const pushRight = Math.abs(this.player.x - right);
        this.player.x = pushLeft < pushRight ? left - playerHalfWidth : right + playerHalfWidth;
        this.player.vx = 0;
        return;
      }
    }
  }

  private updateEnemies(dt: number) {
    for (const enemy of this.enemies) {
      enemy.cd -= dt;
      if (enemy.type === 'spore') {
        enemy.y = LANE_Y;
        enemy.vx = enemy.x > this.player.x ? -U(82) : U(82);
      }
      if (enemy.type === 'wing') {
        enemy.vx = enemy.x > this.player.x ? -U(70) : U(70);
        enemy.y = LANE_Y + Math.sin(this.elapsed * 3 + enemy.x * 0.02) * U(4);
        if (enemy.cd <= 0 && this.canEnemyShoot(enemy, U(360))) {
          this.enemyShot(enemy.x, enemy.y + this.enemyShotOffset(enemy), this.player.x > enemy.x ? 1 : -1, U(130));
          enemy.cd = 3.4;
        }
      }
      if (enemy.type === 'turret') {
        enemy.y = LANE_Y;
        enemy.vx = 0;
        if (enemy.cd <= 0 && this.canEnemyShoot(enemy, U(420))) {
          this.enemyShot(enemy.x - U(20), enemy.y + this.enemyShotOffset(enemy) + U(8), this.player.x > enemy.x ? 1 : -1, U(135));
          enemy.cd = 3.1;
        }
      }
      if (enemy.type === 'boss') {
        this.bossTime += dt;
        enemy.vx = Math.sin(this.bossTime * 0.7) * U(28);
        enemy.y = BOSS_Y + Math.sin(this.bossTime * 1.1) * U(10);
        const hpRatio = enemy.hp / enemy.maxHp;
        const phase = hpRatio <= BOSS_ENRAGE_RATIO ? 3 : hpRatio <= BOSS_PHASE_TWO_RATIO ? 2 : 1;
        this.updateBossEnrageAudio(phase >= 3, dt);
        if (enemy.cd <= 0 && this.canEnemyShoot(enemy, U(980))) {
          const shotX = enemy.x - U(115);
          const targetX = this.player.x;
          const targetY = this.player.y + U(12);
          this.enemyShotAt(shotX, enemy.y + this.enemyShotOffset(enemy) + U(46), targetX, targetY, phase >= 3 ? U(255) : U(220), 2.6);
          if (phase >= 2) this.enemyShotAt(shotX, enemy.y + this.enemyShotOffset(enemy) - U(18), targetX, targetY + U(34), U(205), 2.45);
          if (phase >= 3) this.enemyShotAt(shotX, enemy.y + this.enemyShotOffset(enemy) + U(88), targetX, targetY - U(28), U(190), 2.35);
          if (phase >= 3 && this.enemies.filter((e) => e.type === 'spore').length < 5) this.spawnEnemy('spore', enemy.x - U(180), 0);
          enemy.cd = phase === 1 ? 1.65 : phase === 2 ? 1.28 : 0.95;
        }
      }
      enemy.x += enemy.vx * dt;
      if (this.enemyTouchesPlayer(enemy)) this.damagePlayer();
    }

    this.enemies = this.enemies.filter((enemy) => {
      if (enemy.hp > 0) return true;
      this.score += enemy.type === 'boss' ? 5000 : 100;
      if (enemy.type === 'boss') this.state = 'win';
      return false;
    });
  }

  private updateBullets(dt: number) {
    for (const bullet of this.bullets) {
      bullet.life -= dt;
      if (!bullet.player && bullet.homing) {
        const speed = Math.max(1, Math.sqrt(bullet.vx * bullet.vx + bullet.vy * bullet.vy));
        const dx = this.player.x - bullet.x;
        const dy = this.player.y + U(12) - bullet.y;
        const length = Math.max(1, Math.sqrt(dx * dx + dy * dy));
        const blend = Math.min(1, dt * 1.45);
        bullet.vx = bullet.vx * (1 - blend) + (dx / length) * speed * blend;
        bullet.vy = bullet.vy * (1 - blend) + (dy / length) * speed * blend;
      }
      bullet.x += bullet.vx * dt;
      bullet.y += bullet.vy * dt;
      if (bullet.player) {
        for (const enemy of this.enemies) {
          const radius = enemy.type === 'boss' ? U(155) : U(44);
          if (bullet.pierce && bullet.hitEnemies?.has(enemy)) continue;
          if (enemy.hp > 0 && this.hit(bullet.x, bullet.y, enemy.x, enemy.y, radius)) {
            enemy.hp -= bullet.damage;
            if (bullet.pierce) {
              if (!bullet.hitEnemies) bullet.hitEnemies = new Set<Enemy>();
              bullet.hitEnemies.add(enemy);
            } else {
              bullet.life = 0;
            }
          }
        }
      } else if (this.hit(bullet.x, bullet.y, this.player.x, this.player.y, ENEMY_BULLET_HIT_RADIUS)) {
        bullet.life = 0;
        this.damagePlayer();
      }
    }
    this.bullets = this.bullets.filter((bullet) => bullet.life > 0 && Math.abs(bullet.x - this.player.x) < U(1320));
  }

  private fire() {
    const spec = WEAPONS[this.weapon];
    this.fireCd = spec.cd;
    this.playSfx(this.weapon === 'flame' ? 'shot_flame' : this.weapon === 'rail' ? 'shot_rail' : 'shot_rifle', this.weapon === 'rail' ? 0.86 : 0.74);
    if (this.weapon === 'flame') {
      for (let i = 0; i < 2; i++) {
        this.bullets.push({
          x: this.player.x + this.player.face * U(46),
          y: this.player.y + U(12),
          vx: this.player.face * spec.speed,
          vy: i ? U(70) : -U(40),
          life: 0.24,
          damage: spec.damage,
          player: true,
          pierce: false,
          kind: 'flame'
        });
      }
      return;
    }
    this.bullets.push({
      x: this.player.x + this.player.face * U(46),
      y: this.player.y + U(12),
      vx: this.player.face * spec.speed,
      vy: 0,
      life: 0.85,
      damage: spec.damage,
      player: true,
      pierce: this.weapon === 'rail',
      kind: this.weapon
    });
  }

  private enemyShot(x: number, y: number, dir: number, speed = U(155), life = 1.35) {
    this.bullets.push({ x, y, vx: dir * speed, vy: 0, life, damage: 1, player: false, pierce: false, kind: 'enemy' });
  }

  private enemyShotAt(x: number, y: number, targetX: number, targetY: number, speed: number, life = 2.4) {
    const dx = targetX - x;
    const dy = targetY - y;
    const length = Math.max(1, Math.sqrt(dx * dx + dy * dy));
    this.bullets.push({
      x,
      y,
      vx: (dx / length) * speed,
      vy: (dy / length) * speed,
      life,
      damage: 1,
      player: false,
      pierce: false,
      kind: 'enemy',
      homing: false
    });
  }

  private spawnEnemy(type: Exclude<EnemyType, 'boss'>, x: number, seed: number) {
    const hp = type === 'turret' ? 24 : type === 'wing' ? 16 : 12;
    this.enemies.push({
      type,
      x,
      y: LANE_Y,
      hp,
      maxHp: hp,
      vx: 0,
      cd: 1.25 + seed * 0.28
    });
  }

  private spawnBoss() {
    const boss = { type: 'boss' as const, x: U(3290), y: BOSS_Y, hp: BOSS_MAX_HP, maxHp: BOSS_MAX_HP, vx: 0, cd: 0.5 };
    this.boss = boss;
    this.enemies.push(boss);
    this.playSfx('boss_alert', 0.95);
  }

  private damagePlayer() {
    if (this.mercy > 0) return;
    this.player.hp = Math.max(0, this.player.hp - 1);
    this.mercy = 0.55;
    if (this.player.hp <= 0) {
      this.state = 'lose';
      this.clearMobileControls();
    }
  }

  private draw() {
    if (!this.sceneReady || !this.graphics) return;
    const g = this.graphics;
    g.clear();

    if (!this.backgroundSprite) {
      const half = this.visibleWorldWidth() / 2;
      g.fillColor = new Color(8, 18, 37, 255);
      g.fillRect(-half, -H / 2, half * 2, H);
    }

    this.drawWorld(g);
    this.drawHudBackplates(g);
    this.syncEnvironmentProps();
    this.drawObstacleSolids(g);
    this.drawActors(g);
    this.drawControlButtons(g);
    this.drawOutcomePanel(g);
    this.syncUiArt();
    this.drawHud();
  }

  private drawHudBackplates(g: Graphics) {
    if (this.state === 'lose' || this.state === 'win' || this.state === 'next') {
      g.fillColor = new Color(0, 0, 0, 145);
      const half = this.visibleWorldWidth() / 2;
      g.fillRect(-half, -H / 2, half * 2, H);
      return;
    }
    const half = this.visibleWorldWidth() / 2;
    const hpX = -half + 18;
    const scorePanel = this.scoreWeaponPanelRect();
    g.fillColor = new Color(5, 12, 22, 205);
    g.fillRect(hpX, H / 2 - U(54), 232, 56);
    g.fillRect(scorePanel.x, scorePanel.y, scorePanel.width, scorePanel.height);
    g.fillColor = new Color(255, 207, 72, 230);
    g.fillRect(hpX, H / 2 - U(54), 4, 56);
    g.fillRect(scorePanel.x, scorePanel.y, 4, scorePanel.height);
    g.strokeColor = new Color(64, 238, 255, 190);
    g.lineWidth = 2;
    g.rect(hpX, H / 2 - U(54), 232, 56);
    g.rect(scorePanel.x, scorePanel.y, scorePanel.width, scorePanel.height);
    g.stroke();
  }

  private drawWorld(g: Graphics) {
    const offset = this.cameraX;
    const half = this.visibleWorldWidth() / 2;
    if (this.backgroundSprite) return;

    if (!this.backgroundSprite) {
      g.fillColor = new Color(18, 52, 50, 255);
      g.fillRect(-half, GROUND - 38, half * 2, 110);

      for (let i = 0; i < 46; i++) {
        const x = i * 120 - offset - 520;
        g.fillColor = i % 2 ? new Color(33, 112, 78, 190) : new Color(39, 92, 104, 170);
        g.circle(x, -84 + (i % 4) * 10, 58 + (i % 3) * 9);
        g.fill();
      }

      g.fillColor = new Color(90, 240, 255, 150);
      for (let i = 0; i < 18; i++) {
        const x = i * 235 - offset - 430;
        g.moveTo(x, GROUND + 10);
        g.lineTo(x + 30, GROUND + 88);
        g.lineTo(x + 62, GROUND + 10);
        g.close();
        g.fill();
      }
    }

    g.fillColor = new Color(42, 112, 70, 255);
    g.fillRect(-half, GROUND - 70, half * 2, 44);
    g.fillColor = new Color(105, 224, 141, 255);
    for (let x = -half; x < half; x += 24) {
      g.moveTo(x, GROUND - 28);
      g.lineTo(x + 9, GROUND + 4);
      g.lineTo(x + 18, GROUND - 28);
      g.close();
      g.fill();
    }
  }

  private syncEnvironmentProps() {
    this.hideEnvironmentProps();
    for (const prop of this.propSprites) {
      prop.sprite.node.setPosition(prop.worldX - this.cameraX, prop.y, 1);
      prop.sprite.node.active = false;
    }
    if (this.backgroundSprite) {
      const maxDrift = 0;
      const drift = -Math.min(maxDrift, (this.cameraX / Math.max(1, END_X - 600)) * maxDrift);
      for (let i = 0; i < this.backgroundSprites.length; i++) {
        this.backgroundSprites[i].node.setPosition(drift, 0, 0);
      }
    }
  }

  private hideEnvironmentProps() {
    for (const sprite of this.propSprites) sprite.sprite.node.active = false;
  }

  private drawObstacleSolids(g: Graphics) {
    if (this.state !== 'playing') {
      this.hideObstacleSprites();
      return;
    }
    const frame = this.uiFrames.get('obstacle_block');
    if (frame) {
      this.syncObstacleSprites(frame);
      return;
    }
    this.hideObstacleSprites();
    for (const obstacle of this.obstacles) {
      const x = obstacle.x - this.cameraX;
      const half = this.visibleWorldWidth() / 2;
      if (x < -half - 180 || x > half + 180) continue;
      const y = obstacle.y + ACTOR_RENDER_Y_OFFSET;
      const left = x - obstacle.width / 2;

      g.fillColor = new Color(15, 28, 32, 235);
      g.fillRect(left, y, obstacle.width, obstacle.height);
      g.strokeColor = new Color(255, 212, 66, 255);
      g.lineWidth = 4;
      g.rect(left, y, obstacle.width, obstacle.height);
      g.stroke();

      g.fillColor = new Color(255, 73, 44, 235);
      for (let stripe = left + 8; stripe < left + obstacle.width - 8; stripe += 26) {
        g.moveTo(stripe, y + 8);
        g.lineTo(stripe + 14, y + 8);
        g.lineTo(stripe + 4, y + obstacle.height - 8);
        g.lineTo(stripe - 10, y + obstacle.height - 8);
        g.close();
        g.fill();
      }

      g.fillColor = new Color(64, 238, 255, 245);
      g.fillRect(left + 8, y + obstacle.height - 8, obstacle.width - 16, 5);
    }
  }

  private syncObstacleSprites(frame: SpriteFrame) {
    const half = this.visibleWorldWidth() / 2;
    for (const obstacle of this.obstacles) {
      let sprite = this.obstacleSprites.get(obstacle);
      if (!sprite) {
        sprite = this.createSprite('ObstacleBlock', this.propLayer);
        sprite.sizeMode = Sprite.SizeMode.CUSTOM;
        this.obstacleSprites.set(obstacle, sprite);
      }
      const x = obstacle.x - this.cameraX;
      const visible = x >= -half - U(180) && x <= half + U(180);
      sprite.spriteFrame = frame;
      sprite.node.getComponent(UITransform)?.setContentSize(obstacle.width, obstacle.height);
      sprite.node.setPosition(x, obstacle.y + obstacle.height / 2 + ACTOR_RENDER_Y_OFFSET, 2);
      sprite.node.active = visible && this.state === 'playing';
    }
  }

  private hideObstacleSprites() {
    for (const sprite of this.obstacleSprites.values()) sprite.node.active = false;
  }

  private drawControlButtons(g: Graphics) {
    if (this.state !== 'playing') return;
    const panel = this.scoreWeaponPanelRect();
    const slotWidth = U(54);
    const slotHeight = U(36);
    const y = panel.y + U(18);
    (Object.keys(WEAPONS) as WeaponId[]).forEach((id, index) => {
      const sx = panel.x + U(68) + index * U(64) - slotWidth / 2;
      const active = this.weapon === id;
      g.fillColor = active ? this.weaponColor(id, 235) : new Color(17, 34, 42, 225);
      g.fillRect(sx, y, slotWidth, slotHeight);
      g.strokeColor = active ? new Color(255, 255, 255, 245) : new Color(64, 238, 255, 120);
      g.lineWidth = active ? 4 : 2;
      g.rect(sx, y, slotWidth, slotHeight);
      g.stroke();
    });
  }

  private drawActors(g: Graphics) {
    if (this.isOutcomeState()) {
      this.hideActorSprites();
      return;
    }
    if (this.spritesReady) {
      this.drawSpriteActors(g);
      return;
    }

    const ox = this.cameraX;
    const px = this.player.x - ox;
    const py = this.player.y + ACTOR_RENDER_Y_OFFSET;
    g.fillColor = this.mercy > 0 ? new Color(255, 255, 255, 220) : new Color(38, 56, 74, 255);
    g.fillRect(px - 22, py - 36, 44, 62);
    g.fill();
    g.fillColor = new Color(70, 217, 255, 255);
    g.fillRect(px - 16, py + 17, 32, 24);
    g.fill();
    g.fillColor = new Color(247, 209, 106, 255);
    g.fillRect(px + this.player.face * 6, py - 8, this.player.face * 42, 10);

    for (const enemy of this.enemies) {
      const x = enemy.x - ox;
      const y = this.enemyRenderY(enemy);
      if (enemy.type === 'spore') {
        g.fillColor = new Color(124, 48, 164, 255);
        g.circle(x, y, 30);
        g.fill();
        g.fillColor = new Color(168, 255, 92, 255);
        g.circle(x - 9, y + 8, 5);
        g.fill();
        g.circle(x + 11, y + 6, 5);
        g.fill();
      } else if (enemy.type === 'wing') {
        g.fillColor = new Color(80, 244, 255, U(130));
        g.moveTo(x - 45, y + 4);
        g.lineTo(x - 10, y + 28);
        g.lineTo(x - 12, y - 18);
        g.close();
        g.fill();
        g.moveTo(x + 45, y + 4);
        g.lineTo(x + 10, y + 28);
        g.lineTo(x + 12, y - 18);
        g.close();
        g.fill();
        g.fillColor = new Color(122, 51, 200, 255);
        g.circle(x, y, 22);
        g.fill();
      } else if (enemy.type === 'turret') {
        g.fillColor = new Color(36, 62, 81, 255);
        g.fillRect(x - 38, y - 22, 76, 42);
        g.fillColor = new Color(146, 251, 255, 255);
        g.fillRect(x - 52, y + 4, 48, 10);
      } else {
        const ratio = Math.max(0, enemy.hp / enemy.maxHp);
        g.fillColor = new Color(58, 28, 100, 255);
        g.circle(x, y, 104);
        g.fill();
        g.fillColor = new Color(255, 79, 174, 255);
        g.circle(x, y + 8, 56);
        g.fill();
        g.fillColor = new Color(249, 255, 144, 255);
        g.circle(x, y + 16, 20);
        g.fill();
        g.fillColor = new Color(255, 79, 174, 255);
        g.fillRect(-140, H / 2 - U(70), 280 * ratio, 10);
      }
    }

    for (const bullet of this.bullets) {
      g.fillColor = bullet.player
        ? this.weaponColor(bullet.kind as WeaponId)
        : new Color(185, 84, 255, 255);
      const x = bullet.x - ox;
      const y = bullet.y + ACTOR_RENDER_Y_OFFSET;
      if (bullet.pierce) g.fillRect(x - 32, y - 4, 64, 8);
      else {
        g.circle(x, y, bullet.player ? 8 : 11);
        g.fill();
      }
    }
  }

  private drawSpriteActors(g: Graphics) {
    this.syncHeroSprite();
    this.syncEnemySprites();
    this.syncBulletSprites();

    if (this.boss && this.boss.hp > 0) {
      const ratio = Math.max(0, this.boss.hp / this.boss.maxHp);
      g.fillColor = new Color(255, 79, 174, 255);
      g.fillRect(-140, H / 2 - U(70), 280 * ratio, 10);
    }
  }

  private hideActorSprites() {
    if (this.heroSprite) this.heroSprite.node.active = false;
    if (this.heroWeaponSprite) this.heroWeaponSprite.node.active = false;
    for (const sprite of this.enemySprites.values()) sprite.node.active = false;
    for (const sprite of this.bulletSprites.values()) sprite.node.active = false;
  }

  private syncHeroSprite() {
    if (!this.heroSprite) this.heroSprite = this.createSprite('HeroSprite');
    const frame = this.getHeroFrame();
    if (frame) this.heroSprite.spriteFrame = frame;
    const x = this.player.x - this.cameraX;
    const blink = this.mercy > 0 && Math.floor(this.elapsed * 18) % 2 === 0;
    const switchLift = this.weaponSwitchTimer > 0 ? Math.sin((this.weaponSwitchTimer / 0.22) * Math.PI) : 0;
    this.heroSprite.node.active = !blink;
    this.heroSprite.node.setPosition(x, this.player.y + ACTOR_RENDER_Y_OFFSET + switchLift * U(5), 0);
    this.heroSprite.node.setScale(new Vec3((US(0.53) + switchLift * US(0.035)) * this.player.face, US(0.53) - switchLift * US(0.014), 1));
    this.syncHeroWeaponSprite(x, switchLift, blink);
  }

  private syncHeroWeaponSprite(heroX: number, switchLift: number, blink: boolean) {
    const frame = this.uiFrames.get(`weapon_${this.weapon}`);
    if (!frame) {
      if (this.heroWeaponSprite) this.heroWeaponSprite.node.active = false;
      return;
    }
    if (!this.heroWeaponSprite) this.heroWeaponSprite = this.createSprite('HeroWeaponSprite');
    this.heroWeaponSprite.spriteFrame = frame;
    const recoil = this.weaponSwitchTimer > 0 ? Math.sin((this.weaponSwitchTimer / 0.22) * Math.PI) * U(12) : 0;
    const x = heroX + this.player.face * (U(34) - recoil);
    const y = this.player.y + ACTOR_RENDER_Y_OFFSET + 8 + switchLift * U(18);
    this.heroWeaponSprite.node.setPosition(x, y, 1);
    this.heroWeaponSprite.node.setScale(new Vec3(US(0.22) * this.player.face, US(0.22), 1));
    this.heroWeaponSprite.node.active = this.state === 'playing' && !blink;
  }

  private syncEnemySprites() {
    for (const [enemy, sprite] of this.enemySprites) {
      if (!this.enemies.includes(enemy)) {
        sprite.node.destroy();
        this.enemySprites.delete(enemy);
      }
    }

    for (const enemy of this.enemies) {
      let sprite = this.enemySprites.get(enemy);
      if (!sprite) {
        sprite = this.createSprite(`Enemy_${enemy.type}`);
        this.enemySprites.set(enemy, sprite);
      }
      const frame = this.getEnemyFrame(enemy);
      if (frame) sprite.spriteFrame = frame;
      sprite.node.setPosition(enemy.x - this.cameraX, this.enemyRenderY(enemy), 0);
      const face = enemy.type === 'spore'
        ? (enemy.x > this.player.x ? 1 : -1)
        : (enemy.x > this.player.x ? -1 : 1);
      const bossEnraged = enemy.type === 'boss' && enemy.hp <= enemy.maxHp * BOSS_ENRAGE_RATIO;
      const scale = enemy.type === 'boss'
        ? (bossEnraged ? US(1.42) : US(1.24))
        : enemy.type === 'turret' ? US(0.44) : enemy.type === 'wing' ? US(0.41) : US(0.51);
      sprite.node.setScale(new Vec3(scale * face, scale, 1));
      sprite.node.active = true;
    }
  }

  private syncBulletSprites() {
    for (const [bullet, sprite] of this.bulletSprites) {
      if (!this.bullets.includes(bullet)) {
        sprite.node.destroy();
        this.bulletSprites.delete(bullet);
      }
    }

    for (const bullet of this.bullets) {
      let sprite = this.bulletSprites.get(bullet);
      if (!sprite) {
        sprite = this.createSprite('Projectile');
        this.bulletSprites.set(bullet, sprite);
      }
      const frame = this.getProjectileFrame(bullet);
      if (frame) sprite.spriteFrame = frame;
      const scale = bullet.kind === 'rail' ? US(0.27) : bullet.kind === 'flame' ? US(0.24) : US(0.22);
      const face = bullet.vx >= 0 ? 1 : -1;
      sprite.node.setPosition(bullet.x - this.cameraX, bullet.y + ACTOR_RENDER_Y_OFFSET, 0);
      sprite.node.setScale(new Vec3(scale * face, scale, 1));
      sprite.node.active = true;
    }
  }

  private createSprite(name: string, parent: Node = this.spriteLayer) {
    const node = new Node(name);
    node.layer = Layers.Enum.UI_2D;
    parent.addChild(node);
    node.addComponent(UITransform);
    const sprite = node.addComponent(Sprite);
    sprite.type = Sprite.Type.SIMPLE;
    sprite.sizeMode = Sprite.SizeMode.RAW;
    return sprite;
  }

  private syncUiArt() {
    this.syncResponsiveUiLayout();
    this.syncHpArt();
    this.syncWeaponArt();
    this.syncTouchControls();
    this.syncOutcomePanelArt();
    this.syncOutcomeButtons();
    this.syncRetryArt();
    this.syncOutcomeText();
    if (this.failOverlaySprite) this.failOverlaySprite.node.active = this.state === 'lose';
  }

  private syncResponsiveUiLayout() {
    const half = this.visibleWorldWidth() / 2;
    const scorePanel = this.scoreWeaponPanelRect();
    this.hpHud.node.setPosition(-half + U(112), H / 2 - U(30), 8);
    this.scoreHud.node.setPosition(scorePanel.x + scorePanel.width / 2, scorePanel.y + scorePanel.height - U(34), 8);
    this.weaponHud.node.setPosition(scorePanel.x + scorePanel.width / 2, scorePanel.y + U(70), 24);
    if (this.hpPanelSprite) this.hpPanelSprite.node.setPosition(-half + U(112), H / 2 - U(30), 6);
  }

  private scoreWeaponPanelRect(): UiRect {
    const half = this.visibleWorldWidth() / 2;
    return {
      x: half - U(430),
      y: H / 2 - U(150),
      width: U(306),
      height: U(112)
    };
  }

  private syncTouchControls() {
    const visible = this.state === 'playing';
    this.touchLeftSprite = this.syncMobileButton(
      this.touchLeftSprite,
      'TouchLeft',
      this.uiFrames.get('mobile_left'),
      this.leftButtonCenter(),
      this.mobileLeft,
      visible,
      () => this.applyMobileAction('left', true),
      () => this.applyMobileAction('left', false)
    );
    this.touchRightSprite = this.syncMobileButton(
      this.touchRightSprite,
      'TouchRight',
      this.uiFrames.get('mobile_right'),
      this.rightButtonCenter(),
      this.mobileRight,
      visible,
      () => this.applyMobileAction('right', true),
      () => this.applyMobileAction('right', false)
    );
    this.touchJumpSprite = this.syncMobileButton(
      this.touchJumpSprite,
      'TouchJump',
      this.uiFrames.get('mobile_jump'),
      this.jumpButtonCenter(),
      this.mobileUp,
      visible,
      () => this.applyMobileAction('up', true),
      () => this.applyMobileAction('up', false),
      false
    );

    const fireFrame = this.uiFrames.get('mobile_fire');
    if (fireFrame) {
      if (!this.touchFireSprite) {
        this.touchFireSprite = this.createSprite('TouchFire', this.uiArtLayer);
        this.bindTouchControlNode(
          this.touchFireSprite.node,
          () => {
            this.mobileFire = true;
          },
          () => {
            this.mobileFire = false;
          }
        );
      }
      const pos = this.fireButtonCenter();
      this.touchFireSprite.spriteFrame = fireFrame;
      this.touchFireSprite.node.getComponent(UITransform)?.setContentSize(U(128), U(128));
      this.touchFireSprite.node.setPosition(pos.x, pos.y, 18);
      this.touchFireSprite.node.setScale(new Vec3(this.mobileFire ? 1.08 : 1, this.mobileFire ? 1.08 : 1, 1));
      this.touchFireSprite.node.active = visible;
      this.setSpriteOpacity(this.touchFireSprite, this.mobileFire ? 245 : 202);
    }

    const switchFrame = this.uiFrames.get('mobile_switch');
    if (switchFrame) {
      if (!this.touchSwitchSprite) {
        this.touchSwitchSprite = this.createSprite('TouchSwitch', this.uiArtLayer);
        this.bindTouchControlNode(
          this.touchSwitchSprite.node,
          () => this.tryCycleWeapon(),
          () => {},
          false
        );
      }
      const pos = this.switchButtonCenter();
      const active = this.weaponSwitchTimer > 0;
      this.touchSwitchSprite.spriteFrame = switchFrame;
      this.touchSwitchSprite.node.getComponent(UITransform)?.setContentSize(U(112), U(112));
      this.touchSwitchSprite.node.setPosition(pos.x, pos.y, 18);
      this.touchSwitchSprite.node.setScale(new Vec3(active ? 1.08 : 1, active ? 1.08 : 1, 1));
      this.touchSwitchSprite.node.active = visible;
      this.setSpriteOpacity(this.touchSwitchSprite, active ? 245 : 202);
    }
  }

  private syncMobileButton(
    sprite: Sprite | null,
    name: string,
    frame: SpriteFrame | undefined,
    pos: { x: number; y: number },
    active: boolean,
    visible: boolean,
    onPress: () => void,
    onRelease: () => void,
    repeatOnMove = true
  ) {
    if (!frame) return sprite;
    if (!sprite) {
      sprite = this.createSprite(name, this.uiArtLayer);
      sprite.sizeMode = Sprite.SizeMode.CUSTOM;
      this.bindTouchControlNode(sprite.node, onPress, onRelease, repeatOnMove);
    }
    sprite.spriteFrame = frame;
    sprite.node.getComponent(UITransform)?.setContentSize(U(116), U(116));
    sprite.node.setPosition(pos.x, pos.y, 18);
    sprite.node.setScale(new Vec3(active ? 1.08 : 1, active ? 1.08 : 1, 1));
    sprite.node.active = visible;
    this.setSpriteOpacity(sprite, active ? 245 : 202);
    return sprite;
  }

  private bindTouchControlNode(
    node: Node,
    onPress: (event: EventTouch | EventMouse) => void,
    onRelease: (event: EventTouch | EventMouse) => void,
    repeatOnMove = true
  ) {
    const bindState = node as unknown as { __steelTouchBound?: boolean };
    if (bindState.__steelTouchBound) return;
    bindState.__steelTouchBound = true;

    const press = (event: EventTouch | EventMouse) => {
      if (this.state !== 'playing') return;
      this.unlockAudio();
      onPress(event);
      this.stopTouchEvent(event);
    };
    const release = (event: EventTouch | EventMouse) => {
      onRelease(event);
      this.stopTouchEvent(event);
    };

    node.on(Node.EventType.TOUCH_START, press, this);
    if (repeatOnMove) node.on(Node.EventType.TOUCH_MOVE, press, this);
    node.on(Node.EventType.TOUCH_END, release, this);
    node.on(Node.EventType.TOUCH_CANCEL, release, this);
    node.on(Node.EventType.MOUSE_DOWN, press, this);
    if (repeatOnMove) node.on(Node.EventType.MOUSE_MOVE, press, this);
    node.on(Node.EventType.MOUSE_UP, release, this);
    node.on(Node.EventType.MOUSE_LEAVE, release, this);
  }

  private bindOutcomeRestartNode(node: Node) {
    const bindState = node as unknown as { __steelOutcomeBound?: boolean };
    if (bindState.__steelOutcomeBound) return;
    bindState.__steelOutcomeBound = true;
    const restart = (event: EventTouch | EventMouse) => {
      if (!this.isOutcomeState()) return;
      this.unlockAudio();
      if (this.handleOutcomeAction(event)) this.stopTouchEvent(event);
    };
    node.on(Node.EventType.TOUCH_START, restart, this);
    node.on(Node.EventType.MOUSE_DOWN, restart, this);
  }

  private stopTouchEvent(event: EventTouch | EventMouse) {
    const stoppable = event as unknown as { stopPropagation?: () => void; propagationStopped?: boolean };
    stoppable.stopPropagation?.();
    stoppable.propagationStopped = true;
  }

  private handleOutcomeAction(event: EventTouch | EventMouse) {
    const points = this.pointerWorldPointCandidates(event);
    if (this.state === 'win') {
      if (this.anyPointInRect(points, this.outcomeNextRect())) {
        this.state = 'next';
        this.clearMobileControls();
        return true;
      }
      if (this.anyPointInRect(points, this.outcomeRestartRect())) {
        this.reset();
        return true;
      }
      return false;
    }
    if ((this.state === 'lose' || this.state === 'next') && this.anyPointInRect(points, this.outcomeSingleRestartRect())) {
      this.reset();
      return true;
    }
    return false;
  }

  private anyPointInRect(points: Array<{ x: number; y: number }>, rect: UiRect) {
    return points.some((point) => this.pointInRect(point.x, point.y, rect));
  }

  private pointInRect(x: number, y: number, rect: UiRect) {
    return x >= rect.x && x <= rect.x + rect.width && y >= rect.y && y <= rect.y + rect.height;
  }

  private setMobileDirectionFromTouchPoint(event: EventTouch | EventMouse) {
    this.clearMobileMove();
    const action = this.resolveDirectionalButtonFromPoints(this.pointerWorldPointCandidates(event));
    if (action) this.applyMobileAction(action, true);
  }

  private setSpriteOpacity(sprite: Sprite, opacity: number) {
    const uiOpacity = sprite.node.getComponent(UIOpacity) ?? sprite.node.addComponent(UIOpacity);
    uiOpacity.opacity = opacity;
  }

  private syncHpArt() {
    if (this.hpPanelSprite) {
      this.hpPanelSprite.node.active = this.state === 'playing';
      for (const sprite of this.hpSprites) sprite.node.active = false;
      this.hpHud.string = this.state === 'playing' ? `生命 ${Math.max(0, this.player.hp)}/6` : '';
      return;
    }
    const hpFrame = this.uiFrames.get('hp_capsule');
    const emptyFrame = this.uiFrames.get('hp_empty') ?? hpFrame;
    if (!hpFrame) return;
    while (this.hpSprites.length < 6) {
      const sprite = this.createSprite(`HpCapsule_${this.hpSprites.length}`, this.uiArtLayer);
      this.hpSprites.push(sprite);
    }
    const startX = -this.visibleWorldWidth() / 2 + U(46);
    for (let i = 0; i < this.hpSprites.length; i++) {
      const sprite = this.hpSprites[i];
      sprite.spriteFrame = i < this.player.hp ? hpFrame : emptyFrame;
      sprite.node.setPosition(startX + i * U(38), H / 2 - U(42), 5);
      sprite.node.setScale(new Vec3(0.19, 0.19, 1));
      sprite.node.active = this.state === 'playing';
    }
  }

  private syncWeaponArt() {
    if (this.weaponSprite) this.weaponSprite.node.active = false;
    const ids = Object.keys(WEAPONS) as WeaponId[];
    const panel = this.scoreWeaponPanelRect();
    for (let index = 0; index < ids.length; index++) {
      const id = ids[index];
      const frame = this.uiFrames.get(`weapon_${id}`);
      if (!frame) continue;
      let sprite = this.weaponSlotSprites.get(id);
      if (!sprite) {
        sprite = this.createSprite(`WeaponSlot_${id}`, this.uiArtLayer);
        this.weaponSlotSprites.set(id, sprite);
      }
      const active = id === this.weapon;
      sprite.spriteFrame = frame;
      sprite.node.setPosition(panel.x + U(68) + index * U(64), panel.y + U(36) + (active ? 3 : 0), 20);
      sprite.node.setScale(new Vec3(active ? US(0.146) : US(0.125), active ? US(0.146) : US(0.125), 1));
      sprite.node.active = this.state === 'playing';
    }
  }

  private syncRetryArt() {
    const frame = this.uiFrames.get('retry_button');
    if (!frame) return;
    if (!this.retrySprite) this.retrySprite = this.createSprite('RetryButton', this.uiArtLayer);
    this.retrySprite.spriteFrame = frame;
    this.retrySprite.node.setPosition(0, U(-118), 20);
    this.retrySprite.node.setScale(new Vec3(US(0.52), US(0.52), 1));
    this.retrySprite.node.active = false;
  }

  private syncOutcomePanelArt() {
    const visible = this.isOutcomeState();
    const frame = this.uiFrames.get(this.state === 'lose' ? 'outcome_fail_panel' : 'outcome_win_panel');
    if (!frame) {
      if (this.outcomePanelSprite) this.outcomePanelSprite.node.active = false;
      return;
    }
    if (!this.outcomePanelSprite) {
      this.outcomePanelSprite = this.createSprite('OutcomePanel', this.uiArtLayer);
      this.bindOutcomeRestartNode(this.outcomePanelSprite.node);
    }
    this.outcomePanelSprite.spriteFrame = frame;
    this.outcomePanelSprite.sizeMode = Sprite.SizeMode.CUSTOM;
    this.outcomePanelSprite.node.getComponent(UITransform)?.setContentSize(U(760), U(450));
    this.outcomePanelSprite.node.setPosition(0, U(-8), 20);
    this.outcomePanelSprite.node.active = visible;
  }

  private getHeroFrame() {
    if (!this.player.grounded) return this.player.vy > 0 ? this.heroFrames[5] : this.heroFrames[6];
    if (Math.abs(this.player.vx) > 1) return this.heroFrames[1 + (Math.floor(this.elapsed * 10) % 4)];
    return this.heroFrames[0];
  }

  private getEnemyFrame(enemy: Enemy) {
    if (enemy.type === 'spore') return this.sporeFrames[Math.floor(this.elapsed * 7) % 3];
    if (enemy.type === 'wing') return this.wingFrames[Math.floor(this.elapsed * 10) % 3];
    if (enemy.type === 'turret') return this.turretFrames[enemy.cd > 0.82 ? 2 : Math.floor(this.elapsed * 2) % 2];
    if (enemy.hp <= enemy.maxHp * BOSS_ENRAGE_RATIO) return this.bossFrames[3];
    if (enemy.cd > 0.72) return this.bossFrames[2];
    return this.bossFrames[Math.floor(this.elapsed * 2) % 2];
  }

  private getProjectileFrame(bullet: Bullet) {
    const pulse = Math.floor(this.elapsed * 18) % 4;
    if (bullet.kind === 'rifle') return this.projectileFrames[pulse];
    if (bullet.kind === 'flame') return this.projectileFrames[4 + pulse];
    if (bullet.kind === 'rail') return this.projectileFrames[8 + (Math.floor(this.elapsed * 12) % 2)];
    return this.projectileFrames[10 + pulse];
  }

  private enemyVisualOffset(enemy: Enemy) {
    if (enemy.type === 'boss') return 0;
    return 0;
  }

  private enemyRenderY(enemy: Enemy) {
    return enemy.y + ACTOR_RENDER_Y_OFFSET + this.enemyVisualOffset(enemy);
  }

  private enemyShotOffset(enemy: Enemy) {
    return enemyVisualProjectileOffset(enemy.type);
  }

  private canEnemyShoot(enemy: Enemy, range: number) {
    if (enemy.type === 'boss') return Math.abs(enemy.x - this.player.x) < range && Math.abs(enemy.y - this.player.y) < 260;
    return Math.abs(enemy.x - this.player.x) < range && Math.abs(enemy.y - this.player.y) < 120;
  }

  private weaponColor(id: WeaponId, alpha = 255) {
    if (id === 'flame') return new Color(255, 96, 42, alpha);
    if (id === 'rail') return new Color(72, 236, 255, alpha);
    return new Color(255, 216, 92, alpha);
  }

  private enemyTouchesPlayer(enemy: Enemy) {
    const dx = Math.abs(this.player.x - enemy.x);
    const dy = Math.abs(this.player.y - enemy.y);
    if (enemy.type === 'boss') return dx < U(135) && dy < U(150);
    return dx < U(34) && dy < U(44);
  }

  private drawOutcomePanel(g: Graphics) {
    if (!this.isOutcomeState() || this.outcomePanelSprite?.node.active) return;
    g.fillColor = new Color(8, 20, 28, 225);
    g.fillRect(-330, -158, 660, 278);
    g.strokeColor = new Color(78, 232, 255, 245);
    g.lineWidth = 4;
    g.rect(-330, -158, 660, 278);
    g.stroke();
    g.fillColor = new Color(255, 207, 72, 245);
    g.fillRect(-210, -132, 420, 58);
    g.fillColor = new Color(62, 238, 255, 210);
    g.fillRect(-330, 110, 660, 6);
    g.fillRect(-330, -158, 660, 6);
  }

  private syncOutcomeButtons() {
    if (!this.outcomeButtonGraphics) return;
    const g = this.outcomeButtonGraphics;
    g.clear();
    const visible = this.isOutcomeState();
    this.outcomeButtonLayer.active = visible;
    if (!visible) return;

    if (this.state === 'win') {
      this.drawOutcomeButton(g, this.outcomeNextRect(), new Color(255, 211, 88, 238), new Color(255, 248, 190, 255), new Color(24, 136, 169, 210));
      this.drawOutcomeButton(g, this.outcomeRestartRect(), new Color(17, 48, 66, 238), new Color(86, 230, 255, 235), new Color(255, 185, 82, 215));
      return;
    }

    const restartColor = this.state === 'lose'
      ? new Color(116, 25, 31, 238)
      : new Color(17, 48, 66, 238);
    const accentColor = this.state === 'lose'
      ? new Color(255, 86, 72, 235)
      : new Color(255, 185, 82, 215);
    this.drawOutcomeButton(g, this.outcomeSingleRestartRect(), restartColor, new Color(255, 226, 205, 235), accentColor);
  }

  private drawOutcomeButton(g: Graphics, rect: UiRect, fill: Color, stroke: Color, accent: Color) {
    g.fillColor = fill;
    g.fillRect(rect.x, rect.y, rect.width, rect.height);
    g.fillColor = accent;
    g.fillRect(rect.x, rect.y, U(7), rect.height);
    g.fillRect(rect.x + rect.width - U(7), rect.y, U(7), rect.height);
    g.strokeColor = stroke;
    g.lineWidth = 3;
    g.rect(rect.x, rect.y, rect.width, rect.height);
    g.stroke();
  }

  private outcomeNextRect(): UiRect {
    return { x: U(-226), y: U(-130), width: U(196), height: U(58) };
  }

  private outcomeRestartRect(): UiRect {
    return { x: U(30), y: U(-130), width: U(196), height: U(58) };
  }

  private outcomeSingleRestartRect(): UiRect {
    return { x: U(-118), y: U(-130), width: U(236), height: U(58) };
  }

  private syncOutcomeText() {
    const visible = this.isOutcomeState();
    const win = this.state === 'win';
    this.outcomeTitle.node.active = visible;
    this.outcomeStats.node.active = visible;
    this.outcomeAction.node.active = visible && !win;
    this.outcomeNextAction.node.active = visible && win;
    this.outcomeRestartAction.node.active = visible && win;
    if (!visible) return;
    if (this.state === 'win') {
      this.outcomeTitle.string = '通关成功';
      this.outcomeStats.string = `得分 ${this.score.toString().padStart(5, '0')}    生命 ${Math.max(0, this.player.hp)}/6`;
      this.outcomeAction.string = '';
      this.outcomeNextAction.string = '选择下一关';
      this.outcomeRestartAction.string = '重新开始';
      this.outcomeNextAction.color = new Color(22, 31, 36, 255);
      this.outcomeRestartAction.color = new Color(232, 252, 255, 255);
      this.outcomeTitle.color = new Color(255, 232, 126, 255);
      this.outcomeStats.color = new Color(225, 250, 255, 255);
      this.outcomeAction.color = new Color(255, 238, 154, 255);
      return;
    }
    if (this.state === 'lose') {
      this.outcomeTitle.string = '挑战失败';
      this.outcomeStats.string = `得分 ${this.score.toString().padStart(5, '0')}`;
      this.outcomeAction.string = '重新开始';
      this.outcomeAction.node.setPosition(0, U(-100), 28);
      this.outcomeTitle.color = new Color(255, 92, 82, 255);
      this.outcomeStats.color = new Color(225, 250, 255, 255);
      this.outcomeAction.color = new Color(255, 226, 205, 255);
      return;
    }
    this.outcomeTitle.string = '下一关筹备中';
    this.outcomeStats.string = '请先返回第一关继续体验';
    this.outcomeAction.string = '重新开始';
    this.outcomeAction.node.setPosition(0, U(-100), 28);
  }

  private isOutcomeState() {
    return this.state === 'win' || this.state === 'next' || this.state === 'lose';
  }

  private drawHud() {
    let status = this.boss && this.boss.hp > 0 ? `BOSS ${Math.ceil(this.boss.hp)}/${this.boss.maxHp}` : '';
    if (this.isOutcomeState()) status = '';
    this.hud.string = status;
    this.hudNode.setPosition(0, this.state === 'lose' ? -40 : H / 2 - U(34), 12);
    this.hud.fontSize = this.state === 'lose' ? 30 : 28;
    this.hud.lineHeight = this.state === 'lose' ? 34 : 32;
    this.hud.color = this.state === 'lose' ? new Color(255, 240, 180, 255) : new Color(255, 255, 255, 255);
    this.scoreHud.string = this.state === 'playing' ? `得分 ${this.score.toString().padStart(5, '0')}` : '';
    this.hpHud.string = this.state === 'playing' ? `生命 ${Math.max(0, this.player.hp)}/6` : '';
    this.weaponHud.string = '';
  }

  private hit(ax: number, ay: number, bx: number, by: number, radius: number) {
    const dx = ax - bx;
    const dy = ay - by;
    return dx * dx + dy * dy < radius * radius;
  }

  private onKeyDown(event: EventKeyboard) {
    this.unlockAudio();
    if (event.keyCode === KeyCode.DIGIT_1) this.setWeapon('rifle');
    if (event.keyCode === KeyCode.DIGIT_2) this.setWeapon('flame');
    if (event.keyCode === KeyCode.DIGIT_3) this.setWeapon('rail');
    if (event.keyCode === KeyCode.KEY_Q) this.tryCycleWeapon();
    if (event.keyCode === KeyCode.KEY_R && this.state !== 'playing') this.reset();
    this.keys.add(event.keyCode);
  }

  private onTouchStart(event: EventTouch) {
    this.unlockAudio();
    if (this.state === 'playing') {
      this.handlePointerStart(this.pointerIdFromTouch(event), event);
      return;
    }
    if (!this.isOutcomeState()) return;
    if (this.handleOutcomeAction(event)) this.stopTouchEvent(event);
  }

  private onTouchMove(event: EventTouch) {
    if (this.state !== 'playing') return;
    this.handlePointerMove(this.pointerIdFromTouch(event), event);
  }

  private onTouchEnd(event: EventTouch) {
    this.handlePointerEnd(this.pointerIdFromTouch(event));
  }

  private onMouseDown(event: EventMouse) {
    if (event.getButton() !== EventMouse.BUTTON_LEFT) return;
    this.unlockAudio();
    if (this.isOutcomeState()) {
      if (this.handleOutcomeAction(event)) this.stopTouchEvent(event);
      return;
    }
    if (this.state !== 'playing') return;
    this.handlePointerStart(-1, event);
  }

  private onMouseMove(event: EventMouse) {
    if (this.state !== 'playing') return;
    this.handlePointerMove(-1, event);
  }

  private onMouseUp(event: EventMouse) {
    this.handlePointerEnd(-1);
  }

  private pointerIdFromTouch(event: EventTouch) {
    return event.getID() ?? 0;
  }

  private handlePointerStart(id: number, event: EventTouch | EventMouse) {
    const action = this.resolveMobileActionFromEvent(event);
    if (!action) return;
    if (action === 'switch') {
      this.tryCycleWeapon();
      return;
    }
    this.pointerActions.set(id, action);
    this.applyMobileAction(action, true);
  }

  private handlePointerMove(id: number, event: EventTouch | EventMouse) {
    const current = this.pointerActions.get(id);
    if (!current || current === 'fire') return;
    const next = this.resolveMobileActionFromEvent(event);
    if (next === 'left' || next === 'right' || next === 'up') {
      this.applyMobileAction(current, false);
      this.pointerActions.set(id, next);
      this.applyMobileAction(next, true);
    }
  }

  private handlePointerEnd(id: number) {
    const action = this.pointerActions.get(id);
    if (!action) return;
    this.applyMobileAction(action, false);
    this.pointerActions.delete(id);
  }

  private resolveMobileActionFromEvent(event: EventTouch | EventMouse): MobileAction | null {
    const points = this.pointerWorldPointCandidates(event);
    if (this.closestPointInCircle(points, this.fireButtonCenter(), U(64))) return 'fire';
    if (this.closestPointInCircle(points, this.switchButtonCenter(), U(56))) return 'switch';
    return this.resolveDirectionalButtonFromPoints(points);
  }

  private resolveDirectionalButtonFromPoints(points: Array<{ x: number; y: number }>): Extract<MobileAction, 'left' | 'right' | 'up'> | null {
    if (this.closestPointInCircle(points, this.jumpButtonCenter(), U(64))) return 'up';
    if (this.closestPointInCircle(points, this.leftButtonCenter(), U(64))) return 'left';
    if (this.closestPointInCircle(points, this.rightButtonCenter(), U(64))) return 'right';
    return null;
  }

  private pointerToWorldPoint(event: EventTouch | EventMouse) {
    return this.pointerWorldPointCandidates(event)[0];
  }

  private pointerWorldPointCandidates(event: EventTouch | EventMouse) {
    const visible = view.getVisibleSize();
    const viewport = view.getViewportRect();
    const frame = view.getFrameSize();

    const spaces = [
      { x: viewport.x, y: viewport.y, width: viewport.width, height: viewport.height },
      { x: 0, y: 0, width: visible.width, height: visible.height },
      { x: 0, y: 0, width: frame.width, height: frame.height }
    ];

    const locations = [this.eventUiLocation(event), event.getLocation()];
    const candidates: Array<{ x: number; y: number }> = [];
    const seen = new Set<string>();

    for (const space of spaces) {
      const width = Math.max(1, space.width);
      const height = Math.max(1, space.height);

      for (const location of locations) {
        const localX = location.x - space.x;
        const localY = location.y - space.y;

        for (const y of [localY, height - localY]) {
          const point = {
            x: (localX / width - 0.5) * this.visibleWorldWidth(),
            y: (y / height - 0.5) * H
          };
          const key = `${Math.round(point.x)}:${Math.round(point.y)}`;
          if (!seen.has(key)) {
            seen.add(key);
            candidates.push(point);
          }
        }
      }
    }

    return candidates;
  }

  private anyPointInCircle(points: Array<{ x: number; y: number }>, center: { x: number; y: number }, radius: number) {
    return points.some((point) => this.hit(point.x, point.y, center.x, center.y, radius));
  }

  private closestPointInCircle(points: Array<{ x: number; y: number }>, center: { x: number; y: number }, radius: number) {
    let closest: { x: number; y: number } | null = null;
    let closestDistance = radius * radius;
    for (const point of points) {
      const dx = point.x - center.x;
      const dy = point.y - center.y;
      const distance = dx * dx + dy * dy;
      if (distance <= closestDistance) {
        closest = point;
        closestDistance = distance;
      }
    }
    return closest;
  }

  private touchToGamePoint(event: EventTouch) {
    return this.pointerToWorldPoint(event);
  }

  private eventUiLocation(event: EventTouch | EventMouse) {
    const uiEvent = event as unknown as { getUILocation?: () => { x: number; y: number } };
    return uiEvent.getUILocation?.() ?? event.getLocation();
  }

  private tryJump() {
    if (this.state !== 'playing' || !this.player.grounded) return;
    this.player.vy = U(620);
    this.player.grounded = false;
    this.playSfx('jump', 0.72);
  }

  private tryFire() {
    if (this.state !== 'playing' || this.fireCd > 0) return;
    this.fire();
  }

  private applyMobileAction(action: MobileAction, active: boolean) {
    if (action === 'left') {
      this.mobileLeft = active;
      if (active) this.mobileRight = false;
    }
    if (action === 'right') {
      this.mobileRight = active;
      if (active) this.mobileLeft = false;
    }
    if (action === 'up') {
      this.mobileUp = active;
      if (active) this.tryJump();
    }
    if (action === 'fire') {
      this.mobileFire = active;
      if (active) this.tryFire();
    }
    this.joystickTilt.x = this.mobileLeft ? -1 : this.mobileRight ? 1 : 0;
    this.joystickTilt.y = this.mobileUp ? 1 : 0;
  }

  private visibleWorldWidth() {
    const visible = view.getVisibleSize();
    return Math.max(W, visible.width || this.viewportWidth || W);
  }

  private leftButtonCenter() {
  const half = this.visibleWorldWidth() / 2;
  return { x: -half + U(72), y: U(-208) };
}

 private rightButtonCenter() {
  const half = this.visibleWorldWidth() / 2;
  return { x: -half + U(214), y: U(-208) };
}

  private jumpButtonCenter() {
  const half = this.visibleWorldWidth() / 2;
  return { x: -half + U(143), y: U(-60) };
}

 private fireButtonCenter() {
  const half = this.visibleWorldWidth() / 2;
  return { x: half - U(100), y: U(-138) };
}

private switchButtonCenter() {
  const half = this.visibleWorldWidth() / 2;
  return { x: half - U(225), y: U(-188) };
}
  private clearMobileMove() {
    this.mobileLeft = false;
    this.mobileRight = false;
    this.mobileUp = false;
    this.mobileDown = false;
    this.joystickTilt.x = 0;
    this.joystickTilt.y = 0;
  }

  private clearMobileControls() {
    this.pointerActions.clear();
    this.clearMobileMove();
    this.mobileFire = false;
  }

  private tryCycleWeapon() {
    if (this.switchInputLock > 0) return;
    this.switchInputLock = 0.18;
    this.cycleWeapon();
  }

  private cycleWeapon() {
    this.setWeapon(this.weapon === 'rifle' ? 'flame' : this.weapon === 'flame' ? 'rail' : 'rifle');
  }

  private setWeapon(next: WeaponId) {
    if (this.weapon === next && this.weaponSwitchTimer > 0) return;
    const changed = this.weapon !== next;
    this.weapon = next;
    this.weaponSwitchTimer = 0.22;
    this.fireCd = Math.min(this.fireCd, 0.08);
    if (changed) this.playSfx('switch_weapon', 0.78);
  }

  private onKeyUp(event: EventKeyboard) {
    this.keys.delete(event.keyCode);
  }

  private reset() {
    this.clearMobileControls();
    this.weapon = 'rifle';
    this.player = { x: U(-360), y: LANE_Y, vx: 0, vy: 0, hp: 6, face: 1, grounded: true };
    this.enemies = [];
    this.bullets = [];
    this.spawned.clear();
    this.boss = null;
    this.fireCd = 0;
    this.mercy = 0;
    this.cameraX = 0;
    this.score = 0;
    this.state = 'playing';
    this.bossTime = 0;
    this.bossEnrageAnnounced = false;
    this.bossRoarTimer = 0;
    this.elapsed = 0;
    for (const sprite of this.enemySprites.values()) sprite.node.destroy();
    for (const sprite of this.bulletSprites.values()) sprite.node.destroy();
    this.enemySprites.clear();
    this.bulletSprites.clear();
  }
}