(function () {
  const BASE = '/Game';
  const params = new URLSearchParams(window.location.search);
  const mapId = params.get('id');
  const editorEmbed = params.get('embed') === '1' || params.get('from') === 'admin';
  if (editorEmbed) {
    document.documentElement.classList.add('editor-embed-admin');
    document.body.classList.add('editor-embed-admin');
  }

  function buildEditorSearch(nextMapId) {
    const p = new URLSearchParams();
    if (nextMapId) p.set('id', nextMapId);
    if (editorEmbed) p.set('embed', '1');
    const s = p.toString();
    return s ? ('?' + s) : '';
  }

  const canvas = document.getElementById('editor-canvas');
  if (!canvas) return;
  const ctx = canvas.getContext('2d');
  const mapLoadEl = document.getElementById('map-load');
  const mapName = document.getElementById('map-name');
  const mapW = document.getElementById('map-w');
  const mapH = document.getElementById('map-h');
  const tileSizeEl = document.getElementById('tile-size');
  const characterCellsWEl = document.getElementById('character-cells-w');
  const characterCellsHEl = document.getElementById('character-cells-h');
  const characterCollisionWEl = document.getElementById('character-collision-w');
  const characterCollisionHEl = document.getElementById('character-collision-h');
  const blockPlayerSeparationWEl = document.getElementById('block-player-separation-w');
  const blockPlayerSeparationHEl = document.getElementById('block-player-separation-h');
  const drawModeEl = document.getElementById('draw-mode');
  const gameTypeEl = document.getElementById('game-type');
  const statusEl = document.getElementById('editor-status');
  const QUIZ_CARRY_EDITOR_OPT_COUNT = 16;

  function quizCarryEditorDrawPalette(slot1based) {
    const i = Math.max(0, Math.min(QUIZ_CARRY_EDITOR_OPT_COUNT - 1, slot1based - 1));
    const h = (i * 47 + 100) % 360;
    return {
      fill: 'hsla(' + h + ',58%,48%,0.52)',
      stroke: 'hsl(' + h + ',65%,42%)',
    };
  }

  function quizCarryEditorCarryModes() {
    const m = ['quizCarryHub', 'carryEmbedCountdown'];
    for (let n = 1; n <= QUIZ_CARRY_EDITOR_OPT_COUNT; n++) m.push('quizCarryOpt' + n);
    return m;
  }

  let tileSize = 32, width = 20, height = 15, characterCellsW = 1, characterCellsH = 1;

  function clampCharacterFootprint(n) {
    const v = parseInt(n, 10);
    if (!Number.isFinite(v)) return 1;
    return Math.max(1, Math.min(4, v));
  }

  function readBlockPlayerSeparationWHForSave() {
    let w = blockPlayerSeparationWEl ? Math.floor(Number(blockPlayerSeparationWEl.value)) : 0;
    let h = blockPlayerSeparationHEl ? Math.floor(Number(blockPlayerSeparationHEl.value)) : 0;
    if (!Number.isFinite(w) || w < 0) w = 0;
    if (!Number.isFinite(h) || h < 0) h = 0;
    return { w: Math.min(4, w), h: Math.min(4, h) };
  }
  function readCharacterFootprintInputs() {
    const cw = characterCellsWEl ? clampCharacterFootprint(characterCellsWEl.value) : characterCellsW;
    const ch = characterCellsHEl ? clampCharacterFootprint(characterCellsHEl.value) : characterCellsH;
    let colW = characterCollisionWEl ? parseInt(String(characterCollisionWEl.value), 10) : cw;
    let colH = characterCollisionHEl ? parseInt(String(characterCollisionHEl.value), 10) : ch;
    if (!Number.isFinite(colW) || colW < 1) colW = cw;
    if (!Number.isFinite(colH) || colH < 1) colH = ch;
    colW = Math.max(1, Math.min(cw, Math.floor(colW)));
    colH = Math.max(1, Math.min(ch, Math.floor(colH)));
    return { cw, ch, colW, colH };
  }
  function applyCharacterFootprintInputs(cw, ch) {
    characterCellsW = clampCharacterFootprint(cw);
    characterCellsH = clampCharacterFootprint(ch);
    if (characterCellsWEl) characterCellsWEl.value = String(characterCellsW);
    if (characterCellsHEl) characterCellsHEl.value = String(characterCellsH);
    if (characterCollisionWEl) {
      let v = parseInt(String(characterCollisionWEl.value), 10);
      if (!Number.isFinite(v) || v < 1) v = characterCellsW;
      characterCollisionWEl.value = String(Math.max(1, Math.min(characterCellsW, v)));
    }
    if (characterCollisionHEl) {
      let v = parseInt(String(characterCollisionHEl.value), 10);
      if (!Number.isFinite(v) || v < 1) v = characterCellsH;
      characterCollisionHEl.value = String(Math.max(1, Math.min(characterCellsH, v)));
    }
  }
  let gameType = 'zep';
  let lanes = [];
  let ground = [], objects = [], blockPlayer = [], interactive = [], startGameArea = [], spawnArea = [], spawn = { x: 1, y: 1 };
  let quizTrueArea = [], quizFalseArea = [], quizQuestionArea = [];
  let quizCarryHubArea = [], quizCarryOptionArea = [];
  /** quiz_carry embed: ช่อง = 1 วางกล่องนับ 3-2-1 บนแมปเมื่อเลือก anchor = grid */
  let carryEmbedCountdownArea = [];
  let quizBattleDomeArea = [];
  /** quiz_battle: กริด 0/1 — ถ้ามีอย่างน้อย 1 ช่อง = ในเกมเดินได้เฉพาะบนเส้นทาง */
  let quizBattlePathArea = [];
  let stackReleaseArea = [], stackLandArea = [];
  /** jump_survive: แพลตฟอร์ม { x, y, w, h } tile — ใช้เต็มที่เมื่อมีมุมข้าง */
  let jumpSurvivePlatforms = [];
  let jumpSurvivePlatformArea = [];
  let cellColors = [];
  let gauntletPlayerSpawns = [];
  /** gauntlet: แถว y บน–ล่างของแถบเลเซอร์ (null = เต็มความสูงแมป) */
  let gauntletLaserRowStart = null;
  let gauntletLaserRowEnd = null;
  /** ล็อบบี้ / ZEP / quiz_carry / ฯลฯ — P1..P6 ตามลำดับ join เมื่อเลือกโหมด slots6 */
  let lobbyPlayerSpawns = [null, null, null, null, null, null];
  /** space_shooter: กริด 0 หรือ 1–6 = ลำดับผู้เล่น P1–P6 */
  let shooterSpawnSlots = [];
  /** balloon_boss: กริด 0 หรือ 1–6 = จุดเกิดผู้เล่น · บอส = tile เดียว */
  let balloonBossPlayerSlots = [];
  let balloonBossBossSpawn = null;
  let showMapInGame = true;
  let backgroundImage = null;
  let backgroundImageImg = null;
  /** พื้นหลังเลื่อนแนวตั้ง — เฉพาะแมป mnpz6rkp (Editor) */
  const EDITOR_SCROLL_BG_MAP_ID = 'mnpz6rkp';
  const EDITOR_SCROLL_BG_DEFAULT_INTRO = BASE + '/img/editor-bg-mnpz6rkp/intro.png';
  const EDITOR_SCROLL_BG_DEFAULT_LOOP = BASE + '/img/editor-bg-mnpz6rkp/loop.png';
  let editorBgScrollConfig = {
    enabled: false,
    speedPxPerSec: 56,
    /** 'up' = ล่าง→บน · 'down' = บน→ล่าง */
    scrollDirection: 'up',
    introImage: null,
    loopImage: null,
  };
  let editorBgScrollIntroImg = null;
  let editorBgScrollLoopImg = null;
  /** viewport top ใน strip (>=0) — เพิ่ม = เลื่อนขึ้น (ล่าง→บน) */
  let editorBgScrollPx = 0;
  let editorBgScrollRaf = null;
  let editorBgScrollLastTs = 0;

  function stopEditorBgScrollRaf() {
    if (editorBgScrollRaf != null) {
      cancelAnimationFrame(editorBgScrollRaf);
      editorBgScrollRaf = null;
    }
    editorBgScrollLastTs = 0;
  }

  function isEditorScrollBgMap() {
    return mapId === EDITOR_SCROLL_BG_MAP_ID;
  }

  function isEditorScrollBgDrawing() {
    if (!isEditorScrollBgMap() || !editorBgScrollConfig.enabled) return false;
    const a = editorBgScrollIntroImg;
    const b = editorBgScrollLoopImg;
    return !!(a && a.complete && a.naturalWidth && b && b.complete && b.naturalWidth);
  }

  function loadEditorBgScrollImagePair(introSrc, loopSrc, onDone) {
    stopEditorBgScrollRaf();
    editorBgScrollIntroImg = null;
    editorBgScrollLoopImg = null;
    let pending = 2;
    const doneOne = () => {
      pending--;
      if (pending <= 0 && typeof onDone === 'function') onDone();
    };
    const im1 = new Image();
    im1.onload = () => {
      editorBgScrollIntroImg = im1;
      doneOne();
    };
    im1.onerror = () => { doneOne(); };
    im1.src = introSrc;
    const im2 = new Image();
    im2.onload = () => {
      editorBgScrollLoopImg = im2;
      doneOne();
    };
    im2.onerror = () => { doneOne(); };
    im2.src = loopSrc;
  }

  function applyEditorBgScrollFromMap(m) {
    if (!isEditorScrollBgMap()) {
      editorBgScrollConfig = { enabled: false, speedPxPerSec: 56, scrollDirection: 'up', introImage: null, loopImage: null };
      stopEditorBgScrollRaf();
      editorBgScrollIntroImg = null;
      editorBgScrollLoopImg = null;
      return;
    }
    const raw = m && m.editorBgScroll && typeof m.editorBgScroll === 'object' ? m.editorBgScroll : {};
    const sp = Math.max(8, Math.min(400, Math.floor(Number(raw.speedPxPerSec)) || 56));
    const sd = String(raw.scrollDirection || raw.direction || 'up').toLowerCase();
    editorBgScrollConfig = {
      enabled: !!raw.enabled,
      speedPxPerSec: sp,
      scrollDirection: (sd === 'down' || sd === 'top' || sd === 'toptobottom') ? 'down' : 'up',
      introImage: typeof raw.introImage === 'string' && raw.introImage.length ? raw.introImage : null,
      loopImage: typeof raw.loopImage === 'string' && raw.loopImage.length ? raw.loopImage : null,
    };
    const introSrc = editorBgScrollConfig.introImage || EDITOR_SCROLL_BG_DEFAULT_INTRO;
    const loopSrc = editorBgScrollConfig.loopImage || EDITOR_SCROLL_BG_DEFAULT_LOOP;
    loadEditorBgScrollImagePair(introSrc, loopSrc, () => {
      syncEditorBgScrollUiFromConfig();
      syncEditorBgScrollInitialToBottom();
      draw();
      if (editorBgScrollConfig.enabled) startEditorBgScrollRaf();
    });
  }

  function syncEditorBgScrollInitialToBottom() {
    const intro = editorBgScrollIntroImg;
    if (!intro || !intro.complete || !intro.naturalWidth) return;
    const cwR = Math.max(1, Math.round(canvas.width));
    const chR = Math.max(1, Math.round(canvas.height));
    const drawHIntro = Math.round(intro.naturalHeight * (cwR / intro.naturalWidth));
    if (editorBgScrollConfig.scrollDirection === 'down') {
      editorBgScrollPx = 0;
    } else {
      editorBgScrollPx = Math.max(0, drawHIntro - chR);
    }
  }

  function syncEditorBgScrollUiFromConfig() {
    const block = document.getElementById('editor-bg-scroll-block');
    if (block) block.hidden = !isEditorScrollBgMap();
    const en = document.getElementById('editor-bg-scroll-enabled');
    if (en) en.checked = !!editorBgScrollConfig.enabled;
    const sp = document.getElementById('editor-bg-scroll-speed');
    if (sp) sp.value = String(editorBgScrollConfig.speedPxPerSec || 56);
    const dir = document.getElementById('editor-bg-scroll-direction');
    if (dir) dir.value = editorBgScrollConfig.scrollDirection === 'down' ? 'down' : 'up';
  }

  function readEditorBgScrollConfigForSave() {
    if (!isEditorScrollBgMap()) return null;
    const en = document.getElementById('editor-bg-scroll-enabled');
    const spEl = document.getElementById('editor-bg-scroll-speed');
    const sp = Math.max(8, Math.min(400, Math.floor(Number(spEl && spEl.value)) || 56));
    const dirEl = document.getElementById('editor-bg-scroll-direction');
    const out = {
      enabled: !!(en && en.checked),
      speedPxPerSec: sp,
      scrollDirection: dirEl && dirEl.value === 'down' ? 'down' : 'up',
    };
    if (editorBgScrollConfig.introImage) out.introImage = editorBgScrollConfig.introImage;
    if (editorBgScrollConfig.loopImage) out.loopImage = editorBgScrollConfig.loopImage;
    return out;
  }

  function drawEditorScrollingBackground(cw, ch) {
    const intro = editorBgScrollIntroImg;
    const loop = editorBgScrollLoopImg;
    if (!intro || !intro.complete || !loop || !loop.complete) return;
    const cwR = Math.max(1, Math.round(cw));
    const chR = Math.max(1, Math.round(ch));
    const scaleI = cwR / intro.naturalWidth;
    const drawHIntro = Math.round(intro.naturalHeight * scaleI);
    const scaleL = cwR / loop.naturalWidth;
    const drawHLoop = Math.max(1, Math.round(loop.naturalHeight * scaleL));
    const S = editorBgScrollPx;
    const vp0 = S;
    const vp1 = S + chR;
    const yLimit = vp1 + drawHLoop * 2;
    const flowDown = editorBgScrollConfig.scrollDirection === 'down';

    function stripTopToDestY(stripTop, drawH) {
      if (!flowDown) return stripTop - S;
      return S + chR - (stripTop + drawH);
    }

    ctx.save();
    ctx.imageSmoothingEnabled = false;
    ctx.beginPath();
    ctx.rect(0, 0, cwR, chR);
    ctx.clip();

    if (vp0 < 0) {
      let k = 1;
      if (vp0 < -drawHLoop * 4) {
        k = Math.max(1, Math.floor(-vp0 / drawHLoop) - 2);
      }
      for (; k < 50000; k++) {
        const y0 = -k * drawHLoop;
        if (y0 >= vp1 + drawHLoop) break;
        if (y0 + drawHLoop <= vp0) continue;
        const dy = Math.round(stripTopToDestY(y0, drawHLoop));
        ctx.drawImage(loop, 0, 0, loop.naturalWidth, loop.naturalHeight, 0, dy, cwR, drawHLoop);
      }
    }

    if (drawHIntro > vp0 && vp1 > 0) {
      const dy = Math.round(stripTopToDestY(0, drawHIntro));
      ctx.drawImage(intro, 0, 0, intro.naturalWidth, intro.naturalHeight, 0, dy, cwR, drawHIntro);
    }

    let y = drawHIntro;
    if (y < yLimit && vp1 > drawHIntro) {
      if (vp0 > drawHIntro) {
        const n = Math.floor((vp0 - drawHIntro) / drawHLoop);
        y = drawHIntro + Math.max(0, n - 1) * drawHLoop;
      }
      while (y < yLimit) {
        const dy = Math.round(stripTopToDestY(y, drawHLoop));
        ctx.drawImage(loop, 0, 0, loop.naturalWidth, loop.naturalHeight, 0, dy, cwR, drawHLoop);
        y += drawHLoop;
      }
    }
    ctx.restore();
  }

  function editorBgScrollTick(ts) {
    editorBgScrollRaf = null;
    if (!isEditorScrollBgDrawing()) return;
    if (!editorBgScrollLastTs) editorBgScrollLastTs = ts;
    const dt = Math.min(64, Math.max(0, ts - editorBgScrollLastTs));
    editorBgScrollLastTs = ts;
    editorBgScrollPx += (editorBgScrollConfig.speedPxPerSec || 56) * (dt / 1000);
    draw();
    editorBgScrollRaf = requestAnimationFrame(editorBgScrollTick);
  }

  function startEditorBgScrollRaf() {
    if (!isEditorScrollBgDrawing()) return;
    stopEditorBgScrollRaf();
    editorBgScrollLastTs = 0;
    editorBgScrollRaf = requestAnimationFrame(editorBgScrollTick);
  }

  /** คลังรูป + สไปรต์ { i, x, y, w, h } — บันทึก gridImageSprites + gridImageCells (สำหรับรุ่นเก่า) */
  let gridImageLibrary = [];
  let gridImageSprites = [];
  let gridImageBrushIndex = 0;
  let pendingHeldLibIndex = -1;
  const editorGridImageElByIndex = {};
  const editorGridImageHeldElByIndex = {};
  const GRID_IMG_MAX_WH = 24;

  function gridLibIdleUrl(entry) {
    if (entry == null) return '';
    if (typeof entry === 'string') return entry;
    if (typeof entry === 'object' && entry.idle) return String(entry.idle);
    return '';
  }
  function gridLibHeldUrl(entry) {
    if (entry == null || typeof entry === 'string') return '';
    if (typeof entry === 'object' && entry.held && String(entry.held).length) return String(entry.held);
    return '';
  }
  function normalizeGridLibEntry(raw) {
    if (raw == null) return null;
    if (typeof raw === 'string' && raw.length > 0) return { idle: raw, held: null };
    if (typeof raw === 'object' && typeof raw.idle === 'string' && raw.idle.length > 0) {
      let held = (typeof raw.held === 'string' && raw.held.length > 0) ? raw.held : null;
      if (held && held === raw.idle) held = null;
      return { idle: raw.idle, held };
    }
    return null;
  }
  function serializeGridLibEntry(entry) {
    const idle = gridLibIdleUrl(entry);
    if (!idle) return null;
    const held = gridLibHeldUrl(entry);
    if (held && held !== idle) return { idle, held };
    return idle;
  }
  let isSpawnMode = false;
  let editorFroggerAnimationId = null;

  /** Bullet list for game-type hint (block layout; avoid one long inline line). */
  function editorHintBulletList(items) {
    if (!items || !items.length) return '';
    return '<ul class="editor-hint-bullets">' + items.map(function (html) {
      return '<li>' + html + '</li>';
    }).join('') + '</ul>';
  }

  function ensureInteractive() {
    if (!interactive.length || interactive.length !== height) {
      const existing = interactive.slice().map(r => r && r.slice());
      interactive = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        interactive.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!interactive[y] || interactive[y].length !== width) interactive[y] = Array(width).fill(0);
      }
    }
  }

  function ensureQuizAreas() {
    if (!quizTrueArea.length || quizTrueArea.length !== height) {
      const existingT = quizTrueArea.slice().map(r => r && r.slice());
      quizTrueArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingT[y] && existingT[y].length === width ? existingT[y].slice() : Array(width).fill(0);
        quizTrueArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizTrueArea[y] || quizTrueArea[y].length !== width) quizTrueArea[y] = Array(width).fill(0);
      }
    }
    if (!quizFalseArea.length || quizFalseArea.length !== height) {
      const existingF = quizFalseArea.slice().map(r => r && r.slice());
      quizFalseArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingF[y] && existingF[y].length === width ? existingF[y].slice() : Array(width).fill(0);
        quizFalseArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizFalseArea[y] || quizFalseArea[y].length !== width) quizFalseArea[y] = Array(width).fill(0);
      }
    }
    if (!quizQuestionArea.length || quizQuestionArea.length !== height) {
      const existingQ = quizQuestionArea.slice().map(r => r && r.slice());
      quizQuestionArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingQ[y] && existingQ[y].length === width ? existingQ[y].slice() : Array(width).fill(0);
        quizQuestionArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizQuestionArea[y] || quizQuestionArea[y].length !== width) quizQuestionArea[y] = Array(width).fill(0);
      }
    }
  }

  function ensureStackAreas() {
    if (!stackReleaseArea.length || stackReleaseArea.length !== height) {
      const existingR = stackReleaseArea.slice().map(r => r && r.slice());
      stackReleaseArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingR[y] && existingR[y].length === width ? existingR[y].slice() : Array(width).fill(0);
        stackReleaseArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!stackReleaseArea[y] || stackReleaseArea[y].length !== width) stackReleaseArea[y] = Array(width).fill(0);
      }
    }
    if (!stackLandArea.length || stackLandArea.length !== height) {
      const existingL = stackLandArea.slice().map(r => r && r.slice());
      stackLandArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingL[y] && existingL[y].length === width ? existingL[y].slice() : Array(width).fill(0);
        stackLandArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!stackLandArea[y] || stackLandArea[y].length !== width) stackLandArea[y] = Array(width).fill(0);
      }
    }
  }

  function ensureQuizCarryAreas() {
    if (!quizCarryHubArea.length || quizCarryHubArea.length !== height) {
      const existingH = quizCarryHubArea.slice().map(r => r && r.slice());
      quizCarryHubArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingH[y] && existingH[y].length === width ? existingH[y].slice() : Array(width).fill(0);
        quizCarryHubArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizCarryHubArea[y] || quizCarryHubArea[y].length !== width) quizCarryHubArea[y] = Array(width).fill(0);
      }
    }
    if (!quizCarryOptionArea.length || quizCarryOptionArea.length !== height) {
      const existingO = quizCarryOptionArea.slice().map(r => r && r.slice());
      quizCarryOptionArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingO[y] && existingO[y].length === width ? existingO[y].slice() : Array(width).fill(0);
        quizCarryOptionArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizCarryOptionArea[y] || quizCarryOptionArea[y].length !== width) quizCarryOptionArea[y] = Array(width).fill(0);
      }
    }
    if (!quizQuestionArea.length || quizQuestionArea.length !== height) {
      const existingQ = quizQuestionArea.slice().map(r => r && r.slice());
      quizQuestionArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingQ[y] && existingQ[y].length === width ? existingQ[y].slice() : Array(width).fill(0);
        quizQuestionArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizQuestionArea[y] || quizQuestionArea[y].length !== width) quizQuestionArea[y] = Array(width).fill(0);
      }
    }
    if (!carryEmbedCountdownArea.length || carryEmbedCountdownArea.length !== height) {
      const existingCd = carryEmbedCountdownArea.slice().map(r => r && r.slice());
      carryEmbedCountdownArea = [];
      for (let y = 0; y < height; y++) {
        const row = existingCd[y] && existingCd[y].length === width ? existingCd[y].slice() : Array(width).fill(0);
        carryEmbedCountdownArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!carryEmbedCountdownArea[y] || carryEmbedCountdownArea[y].length !== width) carryEmbedCountdownArea[y] = Array(width).fill(0);
      }
    }
  }

  function ensureQuizBattleDomeArea() {
    if (!quizBattleDomeArea.length || quizBattleDomeArea.length !== height) {
      const existing = quizBattleDomeArea.slice().map(r => r && r.slice());
      quizBattleDomeArea = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        quizBattleDomeArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizBattleDomeArea[y] || quizBattleDomeArea[y].length !== width) quizBattleDomeArea[y] = Array(width).fill(0);
      }
    }
  }

  function ensureQuizBattlePathArea() {
    if (!quizBattlePathArea.length || quizBattlePathArea.length !== height) {
      const existing = quizBattlePathArea.slice().map(r => r && r.slice());
      quizBattlePathArea = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        quizBattlePathArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!quizBattlePathArea[y] || quizBattlePathArea[y].length !== width) quizBattlePathArea[y] = Array(width).fill(0);
      }
    }
  }

  function ensureStartGameArea() {
    if (!startGameArea.length || startGameArea.length !== height) {
      const existing = startGameArea.slice().map(r => r && r.slice());
      startGameArea = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        startGameArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!startGameArea[y] || startGameArea[y].length !== width) startGameArea[y] = Array(width).fill(0);
      }
    }
  }

  /** โหลดแมปแล้ว objects/ground แถวไม่ครบ → คลิกวาดพัง — เติมกริดให้ตรง width×height */
  function ensureObjectsGroundGrids() {
    const z = () => Array(width).fill(0);
    const pad = (arr) => {
      const ex = (arr && arr.slice) ? arr.map((r) => (r && r.slice ? r.slice() : null)) : [];
      const out = [];
      for (let y = 0; y < height; y++) {
        const r = ex[y];
        if (r && r.length === width) out.push(r.slice());
        else {
          const row = z();
          if (r) for (let x = 0; x < Math.min(width, r.length); x++) if (r[x] != null) row[x] = r[x];
          out.push(row);
        }
      }
      return out;
    };
    objects = pad(objects);
    ground = pad(ground);
  }

  function ensureShooterSpawnSlots() {
    if (!shooterSpawnSlots.length || shooterSpawnSlots.length !== height) {
      const existing = shooterSpawnSlots.slice().map((r) => r && r.slice());
      shooterSpawnSlots = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        shooterSpawnSlots.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!shooterSpawnSlots[y] || shooterSpawnSlots[y].length !== width) {
          shooterSpawnSlots[y] = Array(width).fill(0);
        }
      }
    }
  }

  function ensureBalloonBossPlayerSlots() {
    if (!balloonBossPlayerSlots.length || balloonBossPlayerSlots.length !== height) {
      const existing = balloonBossPlayerSlots.slice().map((r) => r && r.slice());
      balloonBossPlayerSlots = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        balloonBossPlayerSlots.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!balloonBossPlayerSlots[y] || balloonBossPlayerSlots[y].length !== width) {
          balloonBossPlayerSlots[y] = Array(width).fill(0);
        }
      }
    }
  }

  function ensureJumpSurvivePlatformArea() {
    if (!jumpSurvivePlatformArea.length || jumpSurvivePlatformArea.length !== height) {
      const existing = jumpSurvivePlatformArea.slice().map((r) => r && r.slice());
      jumpSurvivePlatformArea = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        jumpSurvivePlatformArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!jumpSurvivePlatformArea[y] || jumpSurvivePlatformArea[y].length !== width) {
          jumpSurvivePlatformArea[y] = Array(width).fill(0);
        }
      }
    }
  }

  function sanitizeGauntletPlayerSpawns() {
    gauntletPlayerSpawns = gauntletPlayerSpawns
      .filter((s) => s && Number.isFinite(s.x) && Number.isFinite(s.y) &&
        s.x >= 0 && s.x < width && s.y >= 0 && s.y < height &&
        !(objects[s.y] && objects[s.y][s.x] === 1))
      .map((s) => ({ x: Math.floor(s.x), y: Math.floor(s.y) }))
      .slice(0, 6);
  }

  function sanitizeGauntletLaserRowsInEditor() {
    if (gauntletLaserRowStart == null || gauntletLaserRowEnd == null) return;
    let y0 = Math.floor(Number(gauntletLaserRowStart));
    let y1 = Math.floor(Number(gauntletLaserRowEnd));
    if (!Number.isFinite(y0)) y0 = 0;
    if (!Number.isFinite(y1)) y1 = height - 1;
    y0 = Math.max(0, Math.min(height - 1, y0));
    y1 = Math.max(0, Math.min(height - 1, y1));
    if (y1 < y0) { const t = y0; y0 = y1; y1 = t; }
    gauntletLaserRowStart = y0;
    gauntletLaserRowEnd = y1;
  }

  function supportsLobbySpawnPaint(gt) {
    return gt === 'zep' || gt === 'lobby' || gt === 'quiz' || gt === 'quiz_carry' || gt === 'stack' || gt === 'jump_survive' || gt === 'quiz_battle';
  }

  function ensureLobbyPlayerSpawnsLength() {
    while (lobbyPlayerSpawns.length < 6) lobbyPlayerSpawns.push(null);
    lobbyPlayerSpawns.length = 6;
  }

  function sanitizeLobbyPlayerSpawnsInEditor() {
    ensureLobbyPlayerSpawnsLength();
    for (let i = 0; i < 6; i++) {
      const s = lobbyPlayerSpawns[i];
      if (!s) continue;
      const x = Math.floor(Number(s.x));
      const y = Math.floor(Number(s.y));
      if (!Number.isFinite(x) || !Number.isFinite(y) || x < 0 || x >= width || y < 0 || y >= height
        || (objects[y] && objects[y][x] === 1)) {
        lobbyPlayerSpawns[i] = null;
      } else {
        lobbyPlayerSpawns[i] = { x, y };
      }
    }
  }

  function syncLobbySpawnAuxUi() {
    const gt = gameTypeEl ? gameTypeEl.value : gameType;
    const wrap = document.getElementById('lobby-spawn-wrap');
    const slotWrap = document.getElementById('lobby-slot-paint-wrap');
    const btnClr = document.getElementById('btn-clear-lobby-spawns');
    const modeEl = document.getElementById('lobby-spawn-mode');
    const use = supportsLobbySpawnPaint(gt);
    if (wrap) wrap.style.display = use ? 'flex' : 'none';
    const slotsMode = !!(use && modeEl && modeEl.value === 'slots6');
    if (slotWrap) slotWrap.style.display = slotsMode ? '' : 'none';
    if (btnClr) btnClr.hidden = !slotsMode;
  }

  function ensureSpawnArea() {
    if (!spawnArea.length || spawnArea.length !== height) {
      const existing = spawnArea.slice().map(r => r && r.slice());
      spawnArea = [];
      for (let y = 0; y < height; y++) {
        const row = existing[y] && existing[y].length === width ? existing[y].slice() : Array(width).fill(0);
        spawnArea.push(row);
      }
    } else {
      for (let y = 0; y < height; y++) {
        if (!spawnArea[y] || spawnArea[y].length !== width) spawnArea[y] = Array(width).fill(0);
      }
    }
  }

  function syncGridImageBrushInputCaps() {
    const wEl = document.getElementById('grid-image-brush-w');
    const hEl = document.getElementById('grid-image-brush-h');
    const cap = Math.min(GRID_IMG_MAX_WH, width, height);
    if (wEl) {
      wEl.max = String(Math.max(1, cap));
      wEl.min = '1';
      const vw = parseInt(wEl.value, 10);
      if (!Number.isFinite(vw) || vw < 1) wEl.value = '1';
      else if (vw > cap) wEl.value = String(cap);
    }
    if (hEl) {
      hEl.max = String(Math.max(1, cap));
      hEl.min = '1';
      const vh = parseInt(hEl.value, 10);
      if (!Number.isFinite(vh) || vh < 1) hEl.value = '1';
      else if (vh > cap) hEl.value = String(cap);
    }
  }

  function rectsOverlap(ax, ay, aw, ah, bx, by, bw, bh) {
    return ax < bx + bw && ax + aw > bx && ay < by + bh && ay + ah > by;
  }

  function deriveGridImageCellsFromSprites() {
    const cells = Array(height).fill(0).map(() => Array(width).fill(null));
    gridImageSprites.forEach((s) => {
      const i = s.i;
      if (!Number.isFinite(i) || i < 0 || i >= gridImageLibrary.length) return;
      for (let yy = s.y; yy < s.y + s.h; yy++) {
        for (let xx = s.x; xx < s.x + s.w; xx++) {
          if (yy >= 0 && yy < height && xx >= 0 && xx < width) cells[yy][xx] = i;
        }
      }
    });
    return cells;
  }

  function migrateSpritesFromMapJson(m, mapW, mapH) {
    if (Array.isArray(m.gridImageSprites) && m.gridImageSprites.length) {
      return m.gridImageSprites.map((raw) => {
        const i = Math.max(0, Math.floor(Number(raw.i)));
        const x = Math.floor(Number(raw.x));
        const y = Math.floor(Number(raw.y));
        const w = Math.max(1, Math.floor(Number(raw.w)) || 1);
        const h = Math.max(1, Math.floor(Number(raw.h)) || 1);
        const b = parseSpriteBindCarryOption(raw.bindCarryOption);
        const o = { i, x, y, w, h };
        if (b != null) o.bindCarryOption = b;
        return o;
      }).filter((s) => Number.isFinite(s.x) && Number.isFinite(s.y));
    }
    const libLen = (Array.isArray(m.gridImageLibrary) && m.gridImageLibrary.length) || 0;
    const gic = m.gridImageCells;
    const out = [];
    if (!Array.isArray(gic) || !libLen) return out;
    const mh = Number.isFinite(mapH) && mapH > 0 ? Math.floor(mapH) : gic.length;
    const mw = Number.isFinite(mapW) && mapW > 0 ? Math.floor(mapW) : (gic[0] && gic[0].length) || 0;
    for (let yy = 0; yy < Math.min(gic.length, mh); yy++) {
      const row = gic[yy];
      if (!row) continue;
      for (let xx = 0; xx < Math.min(row.length, mw || row.length); xx++) {
        if (row[xx] == null) continue;
        const iv = parseInt(row[xx], 10);
        if (!Number.isFinite(iv) || iv < 0 || iv >= libLen) continue;
        out.push({ i: iv, x: xx, y: yy, w: 1, h: 1 });
      }
    }
    return out;
  }

  function parseSpriteBindCarryOption(raw) {
    if (raw == null || raw === '') return null;
    const n = typeof raw === 'number' ? raw : parseInt(String(raw), 10);
    if (!Number.isFinite(n) || n < 1 || n > QUIZ_CARRY_EDITOR_OPT_COUNT) return null;
    return n;
  }

  function readSpriteCarryBindFromSelect() {
    const el = document.getElementById('grid-sprite-carry-bind');
    if (!el) return null;
    const v = String(el.value || '').trim();
    if (v === '' || v === 'auto') return null;
    return parseSpriteBindCarryOption(v);
  }

  function clampSpriteToMap(s) {
    let { i, x, y, w, h, bindCarryOption } = s;
    if (x < 0) { w += x; x = 0; }
    if (y < 0) { h += y; y = 0; }
    if (x + w > width) w = width - x;
    if (y + h > height) h = height - y;
    w = Math.max(1, w);
    h = Math.max(1, h);
    const out = { i, x, y, w, h };
    const b = parseSpriteBindCarryOption(bindCarryOption);
    if (b != null) out.bindCarryOption = b;
    return out;
  }

  function sanitizeSpritesInPlace() {
    gridImageSprites = gridImageSprites.map(clampSpriteToMap).filter((sp) => {
      if (!Number.isFinite(sp.i) || sp.i < 0 || sp.i >= gridImageLibrary.length) return false;
      if (sp.w < 1 || sp.h < 1) return false;
      return sp.x < width && sp.y < height && sp.x + sp.w > 0 && sp.y + sp.h > 0;
    });
  }

  function removeSpritesOverlappingRect(x0, y0, w0, h0) {
    gridImageSprites = gridImageSprites.filter((sp) => !rectsOverlap(x0, y0, w0, h0, sp.x, sp.y, sp.w, sp.h));
  }

  function findSpriteIndexAtCell(px, py) {
    for (let k = gridImageSprites.length - 1; k >= 0; k--) {
      const s = gridImageSprites[k];
      if (px >= s.x && py >= s.y && px < s.x + s.w && py < s.y + s.h) return k;
    }
    return -1;
  }

  function canPlaceSpriteAt(anchorX, anchorY, sw, sh, libIdx) {
    if (!Number.isFinite(libIdx) || libIdx < 0 || libIdx >= gridImageLibrary.length) return null;
    const ax = Math.max(0, Math.min(Math.floor(anchorX), width - 1));
    const ay = Math.max(0, Math.min(Math.floor(anchorY), height - 1));
    const cap = Math.min(GRID_IMG_MAX_WH, width, height);
    let w = Math.max(1, Math.min(Math.floor(sw) || 1, width - ax, cap));
    let h = Math.max(1, Math.min(Math.floor(sh) || 1, height - ay, cap));
    for (let yy = ay; yy < ay + h; yy++) {
      for (let xx = ax; xx < ax + w; xx++) {
        if (objects[yy][xx] === 1) return null;
      }
    }
    const out = { i: libIdx, x: ax, y: ay, w, h };
    const b = readSpriteCarryBindFromSelect();
    if (b != null) out.bindCarryOption = b;
    return out;
  }

  function rebuildGridImageGallery() {
    const gal = document.getElementById('grid-cell-image-gallery');
    if (!gal) return;
    gal.innerHTML = '';
    if (!gridImageLibrary.length) {
      gal.innerHTML = '<span class="grid-cell-image-gallery-empty">ยังไม่มีรูป — อัปโหลดด้านล่าง</span>';
      return;
    }
    if (gridImageBrushIndex >= gridImageLibrary.length) gridImageBrushIndex = gridImageLibrary.length - 1;
    gridImageLibrary.forEach((entry, idx) => {
      const row = document.createElement('div');
      row.className = 'grid-cell-image-gallery-row';
      const btn = document.createElement('button');
      btn.type = 'button';
      btn.className = 'grid-cell-image-gallery-item' + (idx === gridImageBrushIndex ? ' is-selected' : '');
      btn.title = 'รูป #' + (idx + 1) + ' (ก่อนหยิบ) — คลิกเลือกแปรง';
      btn.dataset.libIndex = String(idx);
      const thumb = document.createElement('img');
      thumb.alt = '';
      thumb.src = gridLibIdleUrl(entry);
      thumb.loading = 'lazy';
      btn.appendChild(thumb);
      const cap = document.createElement('span');
      cap.className = 'grid-cell-image-gallery-cap';
      cap.textContent = '#' + (idx + 1);
      btn.appendChild(cap);
      btn.addEventListener('click', () => {
        gridImageBrushIndex = idx;
        Array.from(gal.querySelectorAll('.grid-cell-image-gallery-item')).forEach((el) => {
          el.classList.toggle('is-selected', el.dataset.libIndex === String(idx));
        });
      });
      const heldSide = document.createElement('div');
      heldSide.className = 'grid-cell-image-gallery-held-side';
      const heldLabel = document.createElement('span');
      heldLabel.className = 'grid-cell-image-gallery-held-label';
      heldLabel.textContent = 'หยิบแล้ว';
      heldSide.appendChild(heldLabel);
      const heldUrl = gridLibHeldUrl(entry);
      if (heldUrl) {
        const him = document.createElement('img');
        him.className = 'grid-cell-image-gallery-held-thumb';
        him.alt = '';
        him.src = heldUrl;
        him.loading = 'lazy';
        heldSide.appendChild(him);
      }
      const btnHeld = document.createElement('button');
      btnHeld.type = 'button';
      btnHeld.className = 'grid-cell-image-gallery-held-btn';
      btnHeld.textContent = heldUrl ? 'เปลี่ยนรูปถือ' : 'ใส่รูปถือ';
      btnHeld.title = 'รูปบนแมปเมื่อมีคนหยิบตัวเลือกในช่องนี้ (quiz carry) จนกว่าจะปล่อย';
      btnHeld.addEventListener('click', (ev) => {
        ev.preventDefault();
        ev.stopPropagation();
        pendingHeldLibIndex = idx;
        const inp = document.getElementById('grid-cell-image-held-upload');
        if (inp) inp.click();
      });
      heldSide.appendChild(btnHeld);
      if (heldUrl) {
        const clr = document.createElement('button');
        clr.type = 'button';
        clr.className = 'grid-cell-image-gallery-clear-held';
        clr.title = 'ลบรูปตอนถือ';
        clr.textContent = '×';
        clr.addEventListener('click', (ev) => {
          ev.preventDefault();
          ev.stopPropagation();
          gridImageLibrary[idx] = { idle: gridLibIdleUrl(gridImageLibrary[idx]), held: null };
          delete editorGridImageHeldElByIndex[idx];
          rebuildGridImageGallery();
          draw();
          if (statusEl) statusEl.textContent = 'ลบรูปตอนถือของ #' + (idx + 1) + ' แล้ว';
        });
        heldSide.appendChild(clr);
      }
      row.appendChild(btn);
      row.appendChild(heldSide);
      if (heldUrl) {
        const idleStr = gridLibIdleUrl(entry);
        if (idleStr && heldUrl === idleStr) {
          const sameHint = document.createElement('div');
          sameHint.className = 'grid-cell-image-gallery-same-hint';
          sameHint.textContent = 'รูปก่อนหยิบกับหยิบแล้วเป็นข้อมูลเดียวกัน — อัปโหลดภาพคนละไฟล์สำหรับ «หยิบแล้ว» จึงจะเห็นต่างในเกม';
          row.appendChild(sameHint);
        }
      }
      gal.appendChild(row);
      primeEditorGridImage(idx);
      primeEditorGridImageHeld(idx);
    });
  }

  function primeEditorGridImage(idx) {
    const idle = gridLibIdleUrl(gridImageLibrary[idx]);
    if (editorGridImageElByIndex[idx] || !idle) return;
    const im = new Image();
    im.onload = () => { draw(); };
    im.onerror = () => { delete editorGridImageElByIndex[idx]; };
    im.src = idle;
    editorGridImageElByIndex[idx] = im;
  }

  function primeEditorGridImageHeld(idx) {
    const held = gridLibHeldUrl(gridImageLibrary[idx]);
    if (!held) {
      delete editorGridImageHeldElByIndex[idx];
      return;
    }
    if (editorGridImageHeldElByIndex[idx]) return;
    const im = new Image();
    im.onload = () => { draw(); };
    im.onerror = () => { delete editorGridImageHeldElByIndex[idx]; };
    im.src = held;
    editorGridImageHeldElByIndex[idx] = im;
  }

  function removeGridImageFromLibraryAt(index) {
    const i = parseInt(index, 10);
    if (!Number.isFinite(i) || i < 0 || i >= gridImageLibrary.length) return;
    gridImageLibrary.splice(i, 1);
    gridImageSprites = gridImageSprites
      .map((s) => {
        if (s.i === i) return null;
        if (s.i > i) return { ...s, i: s.i - 1 };
        return s;
      })
      .filter(Boolean);
    if (gridImageBrushIndex >= gridImageLibrary.length) gridImageBrushIndex = Math.max(0, gridImageLibrary.length - 1);
    Object.keys(editorGridImageElByIndex).forEach((k) => { delete editorGridImageElByIndex[k]; });
    Object.keys(editorGridImageHeldElByIndex).forEach((k) => { delete editorGridImageHeldElByIndex[k]; });
    sanitizeSpritesInPlace();
    rebuildGridImageGallery();
    syncGridImageBrushInputCaps();
    draw();
    if (statusEl) statusEl.textContent = 'ลบรูปออกจากคลังแล้ว';
  }

  function buildDefaultLanes() {
    const arr = [];
    for (let y = 0; y < height; y++) {
      if (y === 0) arr.push({ y: 0, type: 'goal' });
      else if (y === height - 1) arr.push({ y: height - 1, type: 'spawn' });
      else arr.push({ y, type: 'safe', speed: 1, dir: 1 });
    }
    return arr;
  }

  function ensureLanes() {
    if (lanes.length !== height) {
      const existing = lanes.slice();
      lanes = [];
      for (let y = 0; y < height; y++) {
        const old = existing.find(l => l.y === y);
        if (old) lanes.push({ ...old, y });
        else lanes.push(y === 0 ? { y: 0, type: 'goal' } : y === height - 1 ? { y: height - 1, type: 'spawn' } : { y, type: 'safe', speed: 1, dir: 1 });
      }
    }
  }

  function getVehiclePositionsEditor(lane, timeMs) {
    if (!lane || (lane.type !== 'road' && lane.type !== 'water')) return [];
    const speed = (lane.speed != null ? lane.speed : 1) * 0.05;
    const dir = lane.dir === -1 ? -1 : 1;
    const spacing = lane.spacing != null ? lane.spacing : (lane.type === 'road' ? 3 : 2.5);
    const period = width + 2;
    const count = Math.max(2, Math.floor(period / spacing));
    const positions = [];
    for (let i = 0; i < count; i++) {
      const p = i * spacing + (timeMs * speed * dir) / 60;
      const pNorm = ((p % period) + period) % period;
      const vx = pNorm - 1;
      positions.push(Math.max(-1, Math.min(width, vx)));
    }
    return positions;
  }

  function renderLanesTable() {
    const wrap = document.getElementById('frogger-lanes-table');
    const froggerWrap = document.getElementById('frogger-lanes-wrap');
    if (!wrap || !froggerWrap) return;
    ensureLanes();
    wrap.innerHTML = '';
    const table = document.createElement('table');
    table.innerHTML = '<thead><tr><th>แถว (y)</th><th>ประเภท</th><th>ความเร็ว</th><th>ทิศทาง</th><th>ระยะห่าง</th></tr></thead><tbody></tbody>';
    const tbody = table.querySelector('tbody');
    lanes.forEach((lane) => {
      const tr = document.createElement('tr');
      const isRoadOrWater = lane.type === 'road' || lane.type === 'water';
      const spacingVal = lane.spacing != null ? lane.spacing : (lane.type === 'road' ? 3 : 2.5);
      tr.innerHTML =
        '<td>' + lane.y + '</td>' +
        '<td><select class="lane-type" data-y="' + lane.y + '">' +
        '<option value="spawn"' + (lane.type === 'spawn' ? ' selected' : '') + '>จุดเกิด</option>' +
        '<option value="safe"' + (lane.type === 'safe' ? ' selected' : '') + '>ปลอดภัย</option>' +
        '<option value="road"' + (lane.type === 'road' ? ' selected' : '') + '>ถนน (รถ)</option>' +
        '<option value="water"' + (lane.type === 'water' ? ' selected' : '') + '>น้ำ (ท่อนซุง)</option>' +
        '<option value="goal"' + (lane.type === 'goal' ? ' selected' : '') + '>ปลายทาง</option>' +
        '</select></td>' +
        '<td><input type="number" class="lane-speed" data-y="' + lane.y + '" min="0.5" max="5" step="0.5" value="' + (lane.speed != null ? lane.speed : 1) + '" ' + (isRoadOrWater ? '' : ' disabled') + '></td>' +
        '<td><select class="lane-dir" data-y="' + lane.y + '" ' + (isRoadOrWater ? '' : ' disabled') + '>' +
        '<option value="1"' + (lane.dir === 1 ? ' selected' : '') + '>ขวา</option>' +
        '<option value="-1"' + (lane.dir === -1 ? ' selected' : '') + '>ซ้าย</option>' +
        '</select></td>' +
        '<td><input type="number" class="lane-spacing" data-y="' + lane.y + '" min="1.5" max="8" step="0.5" value="' + spacingVal + '" title="ระยะห่างรถ/ท่อนซุง (ยิ่งมากยิ่งห่าง)" ' + (isRoadOrWater ? '' : ' disabled') + '></td>';
      tbody.appendChild(tr);
    });
    wrap.appendChild(table);
    wrap.querySelectorAll('.lane-type').forEach(sel => {
      sel.addEventListener('change', function () {
        const y = parseInt(this.dataset.y, 10);
        const lane = lanes.find(l => l.y === y);
        if (lane) { lane.type = this.value; lane.speed = lane.speed != null ? lane.speed : 1; lane.dir = lane.dir != null ? lane.dir : 1; if (lane.type === 'road' || lane.type === 'water') lane.spacing = lane.spacing != null ? lane.spacing : (lane.type === 'road' ? 3 : 2.5); renderLanesTable(); draw(); }
      });
    });
    wrap.querySelectorAll('.lane-speed').forEach(inp => {
      inp.addEventListener('input', function () { const y = parseInt(this.dataset.y, 10); const lane = lanes.find(l => l.y === y); if (lane) lane.speed = parseFloat(this.value) || 1; draw(); });
    });
    wrap.querySelectorAll('.lane-dir').forEach(sel => {
      sel.addEventListener('change', function () { const y = parseInt(this.dataset.y, 10); const lane = lanes.find(l => l.y === y); if (lane) lane.dir = parseInt(this.value, 10) || 1; draw(); });
    });
    wrap.querySelectorAll('.lane-spacing').forEach(inp => {
      inp.addEventListener('input', function () { const y = parseInt(this.dataset.y, 10); const lane = lanes.find(l => l.y === y); if (lane) { lane.spacing = parseFloat(this.value) || 2; draw(); } });
    });
  }

  function toggleFroggerUI() {
    const froggerWrap = document.getElementById('frogger-lanes-wrap');
    const hint = document.getElementById('game-type-hint');
    const legEl = document.getElementById('frogger-lanes-legend');
    const dqTrue = document.getElementById('draw-mode-option-quiz-true');
    const dqFalse = document.getElementById('draw-mode-option-quiz-false');
    const dqQ = document.getElementById('draw-mode-option-quiz-question');
    const dqStackR = document.getElementById('draw-mode-option-stack-release');
    const dqStackL = document.getElementById('draw-mode-option-stack-land');
    const dqCarryOpts = document.querySelectorAll('.quiz-carry-mode-opt');
    const dqBattleDome = document.getElementById('draw-mode-option-quiz-battle-dome');
    const dqBattlePath = document.getElementById('draw-mode-option-quiz-battle-path');
    if (!froggerWrap) return;
    const gt = gameTypeEl ? gameTypeEl.value : 'zep';
    if (dqTrue) dqTrue.hidden = gt !== 'quiz';
    if (dqFalse) dqFalse.hidden = gt !== 'quiz';
    if (dqQ) dqQ.hidden = gt !== 'quiz' && gt !== 'quiz_carry';
    if (dqStackR) dqStackR.hidden = gt !== 'stack';
    if (dqStackL) dqStackL.hidden = gt !== 'stack';
    const showCarry = gt === 'quiz_carry';
    dqCarryOpts.forEach(function (node) { node.hidden = !showCarry; });
    const carryCdWrap = document.getElementById('editor-quiz-carry-countdown-wrap');
    if (carryCdWrap) carryCdWrap.style.display = showCarry ? 'flex' : 'none';
    if (dqBattleDome) {
      dqBattleDome.hidden = gt !== 'quiz_battle';
      if (gt !== 'quiz_battle' && drawModeEl && drawModeEl.value === 'quizBattleDome') drawModeEl.value = 'wall';
    }
    if (dqBattlePath) {
      dqBattlePath.hidden = gt !== 'quiz_battle';
      if (gt !== 'quiz_battle' && drawModeEl && drawModeEl.value === 'quizBattlePath') drawModeEl.value = 'wall';
    }
    if (hint) hint.style.removeProperty('display');
    if (gt === 'frogger') {
      froggerWrap.style.display = 'block';
      if (legEl) legEl.innerHTML = 'แถวบน (y=0) = ปลายทาง · แถวล่าง = จุดเกิด · ถนน/น้ำ ตั้งความเร็ว ทิศทาง และ <strong>ระยะห่าง</strong> (ยิ่งมากยิ่งห่าง เกมง่ายขึ้น)';
      if (hint) {
        hint.innerHTML = editorHintBulletList([
          'แถวบน (y=0) = <strong>ปลายทาง</strong>',
          'แถวล่าง = <strong>จุดเกิด</strong>',
          'ตั้งถนน/น้ำด้านล่าง — ความเร็ว ทิศทาง ระยะห่างรถหรือท่อนซุง',
        ]);
      }
      ensureLanes();
      renderLanesTable();
      draw();
      if (editorFroggerAnimationId != null) cancelAnimationFrame(editorFroggerAnimationId);
      editorFroggerAnimationId = requestAnimationFrame(editorFroggerTick);
    } else if (gt === 'gauntlet') {
      froggerWrap.style.display = 'none';
      if (legEl) legEl.innerHTML = '<strong>พรมแดงสุดท้าย:</strong> ลำดับเกิดกำหนดแค่ <strong>แถว (y)</strong> — ในเกมทุกคนยืน <strong>คอลัมน์ x เดียวกัน</strong> (ซ้ายสุดจากจุดที่วาด) ไม่เฉียง';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead">โหมด <strong>พรมแดงสุดท้าย</strong></p>' + editorHintBulletList([
          'อุปสรรคเลนเฉพาะ<strong>แถวที่มีคน</strong> + เลเซอร์ทุกแถว · ชนแล้วถอยซ้าย',
          'โหมดวาด <strong>เลเซอร์: แถวต้น / แถวปลาย</strong> — กำหนดความสูงแถบเลเซอร์บนแมป (ไม่ต้องเปลี่ยนรูปจาก Admin)',
          'ลำดับเกิด <strong>1–6</strong> หรือช่องฟ้า',
          'กระโดด: <kbd>Space</kbd> · <kbd>W</kbd> · <kbd>↑</kbd>',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'lobby') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = editorHintBulletList([
          'วาดฉาก<strong>ห้องโถง</strong> — รอผู้เล่นและตกแต่งฉาก',
          '<strong>พื้นที่เริ่มเกม (ส้ม)</strong> — host ยืนในโซนนี้ก่อนกดเริ่ม',
          '<strong>พื้นที่สุ่มจุดเกิด (ฟ้าอ่อน)</strong> — ผู้เล่นใหม่สุ่มเกิดในช่องที่วาด',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'quiz') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = editorHintBulletList([
          '<strong>โซนถูก (ฟ้า)</strong> · <strong>โซนผิด (ชมพู)</strong> · <strong>พื้นที่คำถาม (ทอง)</strong>',
          '<strong>พื้นที่สุ่มจุดเกิด (ฟ้าอ่อน)</strong> — ผู้เล่นเข้าห้องสุ่มยืนในโซน',
          'คำถามและเวลา — ตั้งที่ <strong>Admin → คำถามเกม</strong>',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'stack') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead"><strong>Stack</strong> — สลับจังหวะลงตึก</p>' + editorHintBulletList([
          '<strong>จุดปล่อย (ฟ้า)</strong> — แนวสวิง crane ด้านบน',
          '<strong>จุดซ้อนตึก (ชมพู)</strong> — แพลตฟอร์มรองรับบล็อก',
          'ในเกมไม่มีเดิน — กด <kbd>Space</kbd> เพื่อปล่อยบล็อก',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'quiz_carry') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead"><strong>หยิบมาวาง</strong> — หยิบตัวเลือกแล้วไปส่งที่โซน interactive (เขียว)</p>' + editorHintBulletList([
          '<strong>โซนกลาง (ม่วง)</strong> — กำแพง · ถ้าไม่วาดโซนทองด้านล่าง ข้อความคำถามจะโชว์บนโซนม่วงในเกม',
          '<strong>พื้นที่โชว์ข้อความคำถาม (ทอง)</strong> — วาดโซนทองแยกได้ · ในเกมข้อความจะอยู่ตรงโซนที่วาด',
          '<strong>โซน interactive (เขียว)</strong> — ยืนบนหรือชิดขอบแล้วกด <kbd>F</kbd> ส่งคำตอบ (วาดอย่างน้อย 1 ช่อง — ถ้าไม่วาดจะใช้ชิดโซนกลางแทน)',
          '<strong>ตัวเลือก 1–16</strong> — วาดบนกริดให้ตรงลำดับ <code>choices</code> (Admin / แมป)',
          'พรีวิวเอดิเตอร์: ช่วงนับ <strong>3-2-1</strong> — เลือกตำแหน่ง (กลางจอ / บนแมปอัตโนมัติที่โซนทองหรือโซนกลาง / <strong>ตามกริด</strong> โหมดวาด «ตำแหน่งเลข 3-2-1») · ไฮไลต์ข้อถูกด้านบน · ต่อข้อ <code>countdownHighlightSlot</code> (1–16)',
          'เล่นพร้อมกันได้ · คำถามจากแมปหรือ Admin',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'jump_survive') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead"><strong>กระโดดให้รอด</strong> — กำแพง + แพลตฟอร์มเลื่อนขึ้นในกรอบจอ</p>' + editorHintBulletList([
          '<strong>กำแพง</strong> = ขอบซ้ายขวา/บน (ชนแล้วตายหรือออกนอกจอ) · <strong>โหมดวาดแพลตฟอร์ม</strong> (ฟ้าอมเขียว) = ท่อนยืนได้ — ตอนเล่นแพลตฟอร์มจะเลื่อนขึ้นในกรอด ไม่ลากทั้งฉาก',
          'ในเกม: กระโดดสูงขึ้น · แพลตฟอร์มเลื่อนขึ้นแล้ว<strong>วนกลับมาด้านล่าง</strong> (คาบ = ความสูงแมป) · กล้องตามตัว — หลุดขอบบน/ล่างจอ = กลับจุดเกิด',
          'พื้นที่สุ่มเกิด (ฟ้า) + ปุ่มตั้งจุดเกิด — แนะนำสูงหลายแถวเพื่อให้มีที่กระโดด',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'space_shooter') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead"><strong>ยิงยานอวกาศ</strong> — หินตก · ผู้เล่น/บอทยิงขึ้น · สูงสุด 6 คน</p>' + editorHintBulletList([
          'เลือกโหมดวาด <strong>จุดเกิดยาน 1–6</strong> แล้วเลือกหมายเลข P ด้านขวา — คลิกซ้ายวาง · คลิกขวาลบช่อง · ช่องเดียวต่อหมายเลข (วางซ้ำจะย้ายจุด)',
          'ลำดับผู้เล่นในเกม: <strong>คุณก่อน</strong> แล้วตามรหัสผู้เล่นอื่น แล้วบอททดสอบ — ตรงกับ P1, P2, …',
          'แนะนำ <strong>รูปพื้นหลัง</strong> อวกาศ + ปิดโชว์กริดในเกม — เล่น: A/D หรือ ←/→ เลื่อน · W/S หรือ ↑/↓ ขึ้นลง (ไม่เกินครึ่งล่างแมป) · Space ยิง',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'balloon_boss') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead"><strong>ลูกโป้งยิงบอส (Mega Virus)</strong> — สูงสุด 6 คน · บอสกลางจอ</p>' + editorHintBulletList([
          'โหมด <strong>จุดเกิดผู้เล่น 1–6</strong> + เลข P ด้านขวา — คลิกซ้ายวาง · ขวาลบ (เหมือนยิงยาน)',
          'โหมด <strong>จุดเกิดบอส</strong> — คลิกช่อง <strong>หนึ่งช่อง</strong> เป็นตำแหน่งศูนย์กลางบอส (กะโหลก + โล่หกเหลี่ยม)',
          'ในเกม: คุมแบบ<strong>ยานมีแรงเฉื่อย</strong> (กดทิศแล้วค่อยเร่ง ปล่อยแล้วยังไหล มีแรงหน่วง) — ไม่สแนปทันที · Space ยิงมี<strong>ดีเลย์</strong> · บอสยิงกลับ · ลูกโป้งหมด = ตกรอบ',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else if (gt === 'quiz_battle') {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead"><strong>Quiz Battle</strong> — เส้นทาง + โดมถาม A / B / C</p>' + editorHintBulletList([
          'โหมด <strong>เส้นทางเดิน (ม่วง)</strong> — วาดซิกแซกเหมือนทางในเกม · ถ้ามีอย่างน้อย 1 ช่อง ผู้เล่น<strong>เดินได้เฉพาะบนเส้นทาง</strong> · ไม่วาดเลย = เดินอิสระทั้งแมป',
          'โหมด <strong>โดมคำถาม</strong> — วางบนเส้นทาง (หรือทั่วแมปถ้าไม่ใช้เส้นทาง) · ในเกมกด <kbd>E</kbd>',
          'รูป <strong>พื้นหลัง</strong> เปลี่ยนทีหลังได้ — ตรรกะเส้นทาง/โดมอยู่ที่กริด ไม่ผูกกราฟิก',
          'ข้อสอบจาก <strong>Admin → Quiz Battle</strong> (<code>battleQuizMcq</code>) · แนะนำ <strong>พื้นที่สุ่มจุดเกิด</strong> ให้อยู่บนเส้นทางหรือใกล้จุดเริ่ม',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    } else {
      froggerWrap.style.display = 'none';
      if (hint) {
        hint.innerHTML = '<p class="editor-hint-lead">เลือกโหมดด้านบน — แต่ละโหมดวาดคนละแบบ</p>' + editorHintBulletList([
          '<strong>ZEP</strong> — เดินอิสระบนแผนที่',
          '<strong>กบข้ามถนน</strong> — ตารางแถว / ถนน น้ำ',
          '<strong>พรมแดงสุดท้าย</strong> — กระโดดหลบ (ไม่ใช่ตารางแถวแบบกบ)',
          '<strong>Stack</strong> — จุดปล่อย (ฟ้า) + จุดซ้อน (ชมพู)',
          '<strong>กระโดดให้รอด</strong> — แพลตฟอร์มรอดชีวิต',
          '<strong>ยิงยานอวกาศ</strong> — หินตก · จุดเกิด P1–P6',
          '<strong>ลูกโป้งยิงบอส</strong> — จุดเกิดผู้เล่น + บอส · ดีเลย์ยิง · ลูกโป้ง = ชีวิต',
          '<strong>Quiz Battle</strong> — โดม + กด <kbd>E</kbd> ตอบ A B C',
          '<strong>ห้องโถง</strong> — พื้นที่เริ่มเกม (ส้ม) · <strong>ตอบคำถาม</strong> — โซนถูก–ผิด + คำถาม',
          '<strong>หยิบมาวาง</strong> — โซนกลาง + ตัวเลือก 1–16 · <strong>ฟ้าอ่อน</strong> = สุ่มจุดเกิด',
        ]);
      }
      if (editorFroggerAnimationId != null) { cancelAnimationFrame(editorFroggerAnimationId); editorFroggerAnimationId = null; }
      draw();
    }
    const sgOpt = document.getElementById('draw-mode-option-start-game');
    if (sgOpt) {
      const show = gt === 'lobby';
      sgOpt.hidden = !show;
      if (!show && drawModeEl && drawModeEl.value === 'startGame') drawModeEl.value = 'wall';
    }
    const saOpt = document.getElementById('draw-mode-option-spawn-area');
    if (saOpt) {
      const showSa = gt !== 'frogger';
      saOpt.hidden = !showSa;
      if (!showSa && drawModeEl && drawModeEl.value === 'spawnArea') drawModeEl.value = 'wall';
    }
    const gSpOpt = document.getElementById('draw-mode-option-gauntlet-player-spawn');
    const btnClrG = document.getElementById('btn-clear-gauntlet-spawns');
    if (gSpOpt) {
      const showG = gt === 'gauntlet';
      gSpOpt.hidden = !showG;
      if (!showG && drawModeEl && drawModeEl.value === 'gauntletPlayerSpawn') drawModeEl.value = 'wall';
    }
    if (btnClrG) btnClrG.hidden = gt !== 'gauntlet';
    const glStartOpt = document.getElementById('draw-mode-option-gauntlet-laser-start');
    const glEndOpt = document.getElementById('draw-mode-option-gauntlet-laser-end');
    const btnClrGl = document.getElementById('btn-clear-gauntlet-laser-span');
    if (glStartOpt) {
      glStartOpt.hidden = gt !== 'gauntlet';
      if (gt !== 'gauntlet' && drawModeEl && drawModeEl.value === 'gauntletLaserStart') drawModeEl.value = 'wall';
    }
    if (glEndOpt) {
      glEndOpt.hidden = gt !== 'gauntlet';
      if (gt !== 'gauntlet' && drawModeEl && drawModeEl.value === 'gauntletLaserEnd') drawModeEl.value = 'wall';
    }
    if (btnClrGl) btnClrGl.hidden = gt !== 'gauntlet';
    const shOpt = document.getElementById('draw-mode-option-shooter-spawn');
    const shWrap = document.getElementById('shooter-slot-paint-wrap');
    const btnClrSh = document.getElementById('btn-clear-shooter-spawns');
    if (shOpt) {
      shOpt.hidden = gt !== 'space_shooter';
      if (gt !== 'space_shooter' && drawModeEl && drawModeEl.value === 'shooterSpawnPaint') drawModeEl.value = 'wall';
    }
    if (shWrap) shWrap.style.display = gt === 'space_shooter' ? '' : 'none';
    if (btnClrSh) btnClrSh.hidden = gt !== 'space_shooter';
    const bbPlayerOpt = document.getElementById('draw-mode-option-balloon-boss-player');
    const bbBossOpt = document.getElementById('draw-mode-option-balloon-boss-boss');
    const bbWrap = document.getElementById('balloon-boss-slot-paint-wrap');
    const btnClrBb = document.getElementById('btn-clear-balloon-boss-spawns');
    if (bbPlayerOpt) {
      bbPlayerOpt.hidden = gt !== 'balloon_boss';
      if (gt !== 'balloon_boss' && drawModeEl && drawModeEl.value === 'balloonBossPlayerPaint') drawModeEl.value = 'wall';
    }
    if (bbBossOpt) {
      bbBossOpt.hidden = gt !== 'balloon_boss';
      if (gt !== 'balloon_boss' && drawModeEl && drawModeEl.value === 'balloonBossBossPaint') drawModeEl.value = 'wall';
    }
    if (bbWrap) bbWrap.style.display = gt === 'balloon_boss' ? '' : 'none';
    if (btnClrBb) btnClrBb.hidden = gt !== 'balloon_boss';
    if (drawModeEl && drawModeEl.value === 'balloonBossPlayerPaint' && gt !== 'balloon_boss') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'balloonBossBossPaint' && gt !== 'balloon_boss') drawModeEl.value = 'wall';
    if (drawModeEl && (drawModeEl.value === 'quizTrue' || drawModeEl.value === 'quizFalse') && gt !== 'quiz') {
      drawModeEl.value = 'wall';
    }
    if (drawModeEl && drawModeEl.value === 'quizQuestion' && gt !== 'quiz' && gt !== 'quiz_carry') {
      drawModeEl.value = 'wall';
    }
    if (drawModeEl && (drawModeEl.value === 'stackRelease' || drawModeEl.value === 'stackLand') && gt !== 'stack') {
      drawModeEl.value = 'wall';
    }
    const carryModes = quizCarryEditorCarryModes();
    if (drawModeEl && carryModes.indexOf(drawModeEl.value) >= 0 && gt !== 'quiz_carry') {
      drawModeEl.value = 'wall';
    }
    if (drawModeEl && (drawModeEl.value === 'quizBattleDome' || drawModeEl.value === 'quizBattlePath') && gt !== 'quiz_battle') {
      drawModeEl.value = 'wall';
    }
    const jPlatOpt = document.getElementById('draw-mode-option-jump-platform');
    if (jPlatOpt) {
      jPlatOpt.hidden = gt !== 'jump_survive';
      if (gt !== 'jump_survive' && drawModeEl && drawModeEl.value === 'jumpSurvivePlatform') drawModeEl.value = 'wall';
    }
    if (drawModeEl && drawModeEl.value === 'shooterSpawnPaint' && gt !== 'space_shooter') drawModeEl.value = 'wall';
    const lobbySpawnOpt = document.getElementById('draw-mode-option-lobby-spawn');
    if (lobbySpawnOpt) {
      const useLobby = supportsLobbySpawnPaint(gt);
      lobbySpawnOpt.hidden = !useLobby;
      if (!useLobby && drawModeEl && drawModeEl.value === 'lobbyPlayerSpawn') drawModeEl.value = 'wall';
    }
    syncLobbySpawnAuxUi();
  }

  function initGrid() {
    width = Math.max(10, Math.min(50, parseInt(mapW.value, 10) || 20));
    height = Math.max(10, Math.min(40, parseInt(mapH.value, 10) || 15));
    tileSize = Math.max(16, Math.min(64, parseInt(tileSizeEl.value, 10) || 32));
    ground = Array(height).fill(0).map(() => Array(width).fill(0));
    objects = Array(height).fill(0).map(() => Array(width).fill(0));
    blockPlayer = Array(height).fill(0).map(() => Array(width).fill(0));
    interactive = Array(height).fill(0).map(() => Array(width).fill(0));
    startGameArea = Array(height).fill(0).map(() => Array(width).fill(0));
    spawnArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizTrueArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizFalseArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizQuestionArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizCarryHubArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizCarryOptionArea = Array(height).fill(0).map(() => Array(width).fill(0));
    carryEmbedCountdownArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizBattleDomeArea = Array(height).fill(0).map(() => Array(width).fill(0));
    quizBattlePathArea = Array(height).fill(0).map(() => Array(width).fill(0));
    stackReleaseArea = Array(height).fill(0).map(() => Array(width).fill(0));
    stackLandArea = Array(height).fill(0).map(() => Array(width).fill(0));
    jumpSurvivePlatformArea = Array(height).fill(0).map(() => Array(width).fill(0));
    shooterSpawnSlots = Array(height).fill(0).map(() => Array(width).fill(0));
    balloonBossPlayerSlots = Array(height).fill(0).map(() => Array(width).fill(0));
    balloonBossBossSpawn = null;
    cellColors = Array(height).fill(0).map(() => Array(width).fill(null));
    gridImageLibrary = [];
    gridImageSprites = [];
    gridImageBrushIndex = 0;
    Object.keys(editorGridImageElByIndex).forEach((k) => { delete editorGridImageElByIndex[k]; });
    Object.keys(editorGridImageHeldElByIndex).forEach((k) => { delete editorGridImageHeldElByIndex[k]; });
    rebuildGridImageGallery();
    syncGridImageBrushInputCaps();
    for (let i = 0; i < width; i++) { objects[0][i] = 1; objects[height - 1][i] = 1; }
    for (let i = 0; i < height; i++) { objects[i][0] = 1; objects[i][width - 1] = 1; }
    spawn = { x: 1, y: 1 };
    if (gameType === 'frogger') { lanes = buildDefaultLanes(); ensureLanes(); }
    if (gameType === 'gauntlet' || gameType === 'stack' || gameType === 'quiz_carry' || gameType === 'quiz_battle' || gameType === 'jump_survive' || gameType === 'space_shooter' || gameType === 'balloon_boss') lanes = [];
    jumpSurvivePlatforms = [];
    gauntletPlayerSpawns = [];
    gauntletLaserRowStart = null;
    gauntletLaserRowEnd = null;
    lobbyPlayerSpawns = [null, null, null, null, null, null];
    const lsmInit = document.getElementById('lobby-spawn-mode');
    if (lsmInit) lsmInit.value = 'random';
    const fpNew = readCharacterFootprintInputs();
    applyCharacterFootprintInputs(fpNew.cw, fpNew.ch);
    mapW.value = width; mapH.value = height; tileSizeEl.value = tileSize;
    resize(); draw();
    toggleFroggerUI();
  }

  function resize() {
    canvas.width = width * tileSize;
    canvas.height = height * tileSize;
    sanitizeGauntletPlayerSpawns();
    sanitizeLobbyPlayerSpawnsInEditor();
    ensureShooterSpawnSlots();
    ensureBalloonBossPlayerSlots();
    sanitizeSpritesInPlace();
    syncGridImageBrushInputCaps();
    draw();
  }

  function getCell(e) {
    const r = canvas.getBoundingClientRect();
    const x = Math.floor((e.clientX - r.left) / tileSize);
    const y = Math.floor((e.clientY - r.top) / tileSize);
    return { x: Math.max(0, Math.min(width - 1, x)), y: Math.max(0, Math.min(height - 1, y)) };
  }

  function draw() {
    const gtDraw = gameTypeEl ? gameTypeEl.value : gameType;
    const isFrogger = gtDraw === 'frogger';
    const isGauntlet = gtDraw === 'gauntlet';
    const isStack = gtDraw === 'stack';
    const isQuizCarry = gtDraw === 'quiz_carry';
    const isQuizBattle = gtDraw === 'quiz_battle';
    const isJumpSurvive = gtDraw === 'jump_survive';
    const isSpaceShooter = gtDraw === 'space_shooter';
    const isBalloonBoss = gtDraw === 'balloon_boss';
    const usesLanes = isFrogger;
    if (usesLanes) ensureLanes();
    ensureInteractive();
    ensureStartGameArea();
    ensureSpawnArea();
    if (gtDraw === 'quiz') ensureQuizAreas();
    if (gtDraw === 'quiz_carry') ensureQuizCarryAreas();
    if (gtDraw === 'quiz_battle') {
      ensureQuizBattlePathArea();
      ensureQuizBattleDomeArea();
    }
    if (gtDraw === 'stack') ensureStackAreas();
    if (gtDraw === 'jump_survive') ensureJumpSurvivePlatformArea();
    if (gtDraw === 'space_shooter') ensureShooterSpawnSlots();
    if (gtDraw === 'balloon_boss') ensureBalloonBossPlayerSlots();
    if (isEditorScrollBgDrawing()) {
      drawEditorScrollingBackground(canvas.width, canvas.height);
    } else if (backgroundImageImg && backgroundImageImg.complete && backgroundImageImg.naturalWidth) {
      ctx.drawImage(backgroundImageImg, 0, 0, canvas.width, canvas.height);
    } else {
      ctx.fillStyle = '#1a1b26';
      ctx.fillRect(0, 0, canvas.width, canvas.height);
    }
    for (let y = 0; y < height; y++) {
      var rowFill = null;
      if (usesLanes && lanes[y]) {
        if (lanes[y].type === 'goal') rowFill = 'rgba(158,206,106,0.35)';
        else if (lanes[y].type === 'spawn') rowFill = 'rgba(187,154,247,0.35)';
        else if (lanes[y].type === 'road') rowFill = 'rgba(120,100,80,0.5)';
        else if (lanes[y].type === 'water') rowFill = 'rgba(125,207,255,0.4)';
      } else if (isGauntlet) {
        rowFill = (y % 2 === 0) ? 'rgba(247,118,190,0.1)' : 'rgba(160,80,120,0.08)';
      } else if (isStack) {
        rowFill = (y % 2 === 0) ? 'rgba(122, 162, 247, 0.09)' : 'rgba(187, 154, 247, 0.07)';
      } else if (isQuizCarry) {
        rowFill = (y % 2 === 0) ? 'rgba(100, 180, 160, 0.06)' : 'rgba(80, 140, 200, 0.05)';
      } else if (isQuizBattle) {
        rowFill = (y % 2 === 0) ? 'rgba(120, 190, 255, 0.07)' : 'rgba(255, 120, 150, 0.06)';
      } else if (isJumpSurvive) {
        rowFill = (y % 2 === 0) ? 'rgba(90, 200, 255, 0.07)' : 'rgba(60, 140, 200, 0.06)';
      } else if (isSpaceShooter) {
        rowFill = (y % 2 === 0) ? 'rgba(25, 40, 95, 0.42)' : 'rgba(18, 28, 72, 0.48)';
      } else if (isBalloonBoss) {
        rowFill = (y % 2 === 0) ? 'rgba(35, 22, 68, 0.45)' : 'rgba(22, 14, 52, 0.5)';
      }
      for (let x = 0; x < width; x++) {
        const tx = x * tileSize, ty = y * tileSize;
        if (objects[y][x] === 1) {
          ctx.fillStyle = 'rgba(65,72,104,0.9)';
          ctx.fillRect(tx, ty, tileSize, tileSize);
          ctx.strokeStyle = '#565f89';
          ctx.strokeRect(tx, ty, tileSize, tileSize);
        } else {
          const cellColor = cellColors[y] && cellColors[y][x];
          if (cellColor) { ctx.fillStyle = cellColor; ctx.fillRect(tx, ty, tileSize, tileSize); }
          else if (rowFill) { ctx.fillStyle = rowFill; ctx.fillRect(tx, ty, tileSize, tileSize); }
          else if (!backgroundImageImg || !backgroundImageImg.complete) {
            ctx.fillStyle = (x + y) % 2 === 0 ? '#24283b' : '#1f2335';
            ctx.fillRect(tx, ty, tileSize, tileSize);
          }
        }
      }
    }
    gridImageSprites.forEach((sp) => {
      primeEditorGridImage(sp.i);
      const gim = editorGridImageElByIndex[sp.i];
      if (!gim || !gim.complete || !gim.naturalWidth) return;
      const tx = sp.x * tileSize;
      const ty = sp.y * tileSize;
      const tw = sp.w * tileSize;
      const th = sp.h * tileSize;
      ctx.save();
      ctx.beginPath();
      ctx.rect(tx, ty, tw, th);
      ctx.clip();
      ctx.drawImage(gim, tx, ty, tw, th);
      ctx.restore();
      ctx.strokeStyle = 'rgba(255,255,255,0.22)';
      ctx.lineWidth = 1;
      ctx.strokeRect(tx + 0.5, ty + 0.5, tw - 1, th - 1);
    });
    for (let y = 0; y < height; y++) {
      var rowFill = null;
      if (usesLanes && lanes[y]) {
        if (lanes[y].type === 'goal') rowFill = 'rgba(158,206,106,0.35)';
        else if (lanes[y].type === 'spawn') rowFill = 'rgba(187,154,247,0.35)';
        else if (lanes[y].type === 'road') rowFill = 'rgba(120,100,80,0.5)';
        else if (lanes[y].type === 'water') rowFill = 'rgba(125,207,255,0.4)';
      } else if (isGauntlet) {
        rowFill = (y % 2 === 0) ? 'rgba(247,118,190,0.1)' : 'rgba(160,80,120,0.08)';
      } else if (isStack) {
        rowFill = (y % 2 === 0) ? 'rgba(122, 162, 247, 0.09)' : 'rgba(187, 154, 247, 0.07)';
      } else if (isQuizCarry) {
        rowFill = (y % 2 === 0) ? 'rgba(100, 180, 160, 0.06)' : 'rgba(80, 140, 200, 0.05)';
      } else if (isQuizBattle) {
        rowFill = (y % 2 === 0) ? 'rgba(120, 190, 255, 0.07)' : 'rgba(255, 120, 150, 0.06)';
      } else if (isJumpSurvive) {
        rowFill = (y % 2 === 0) ? 'rgba(90, 200, 255, 0.07)' : 'rgba(60, 140, 200, 0.06)';
      } else if (isSpaceShooter) {
        rowFill = (y % 2 === 0) ? 'rgba(25, 40, 95, 0.42)' : 'rgba(18, 28, 72, 0.48)';
      } else if (isBalloonBoss) {
        rowFill = (y % 2 === 0) ? 'rgba(35, 22, 68, 0.45)' : 'rgba(22, 14, 52, 0.5)';
      }
      for (let x = 0; x < width; x++) {
        const tx = x * tileSize, ty = y * tileSize;
        if (blockPlayer[y] && blockPlayer[y][x] === 1) {
          ctx.fillStyle = 'rgba(255,180,80,0.5)';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.strokeStyle = 'rgba(255,180,80,0.9)';
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
        }
        if (interactive[y] && interactive[y][x] === 1) {
          ctx.fillStyle = 'rgba(158,206,106,0.45)';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.strokeStyle = '#9ece6a';
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
        }
        if (startGameArea[y] && startGameArea[y][x] === 1) {
          ctx.fillStyle = 'rgba(255, 158, 100, 0.5)';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.strokeStyle = 'rgba(255, 120, 60, 0.95)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.lineWidth = 1;
        }
        if (spawnArea[y] && spawnArea[y][x] === 1) {
          ctx.fillStyle = 'rgba(122, 162, 247, 0.38)';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.strokeStyle = 'rgba(122, 162, 247, 0.92)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.lineWidth = 1;
        }
        if (gtDraw === 'quiz') {
          if (quizQuestionArea[y] && quizQuestionArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(255, 214, 102, 0.42)';
            ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.strokeStyle = 'rgba(224, 185, 70, 0.95)';
            ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          }
          if (quizTrueArea[y] && quizTrueArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(86, 202, 255, 0.5)';
            ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.strokeStyle = 'rgba(122, 220, 255, 0.95)';
            ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          }
          if (quizFalseArea[y] && quizFalseArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(247, 118, 190, 0.5)';
            ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.strokeStyle = 'rgba(255, 130, 200, 0.95)';
            ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          }
        }
        if (gtDraw === 'stack') {
          if (stackReleaseArea[y] && stackReleaseArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(125, 207, 255, 0.42)';
            ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.strokeStyle = 'rgba(122, 220, 255, 0.92)';
            ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          }
          if (stackLandArea[y] && stackLandArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(247, 118, 190, 0.42)';
            ctx.fillRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
            ctx.strokeStyle = 'rgba(255, 130, 200, 0.92)';
            ctx.strokeRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          }
        }
        if (gtDraw === 'jump_survive' && jumpSurvivePlatformArea[y] && jumpSurvivePlatformArea[y][x] === 1) {
          ctx.fillStyle = 'rgba(125, 235, 200, 0.48)';
          ctx.fillRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          ctx.strokeStyle = 'rgba(160, 255, 220, 0.92)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          ctx.lineWidth = 1;
        }
        if (gtDraw === 'space_shooter' && shooterSpawnSlots[y] && shooterSpawnSlots[y][x] >= 1 && shooterSpawnSlots[y][x] <= 6) {
          const sn = shooterSpawnSlots[y][x];
          const hue = (sn * 52 + 180) % 360;
          ctx.fillStyle = 'hsla(' + hue + ', 70%, 55%, 0.38)';
          ctx.fillRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          ctx.strokeStyle = 'hsla(' + hue + ', 85%, 65%, 0.95)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          ctx.lineWidth = 1;
          ctx.fillStyle = '#e0f7ff';
          ctx.font = 'bold 12px sans-serif';
          ctx.textAlign = 'center';
          ctx.fillText('P' + sn, tx + tileSize / 2, ty + tileSize / 2 + 4);
          ctx.textAlign = 'left';
        }
        if (gtDraw === 'balloon_boss' && balloonBossPlayerSlots[y] && balloonBossPlayerSlots[y][x] >= 1 && balloonBossPlayerSlots[y][x] <= 6) {
          const sn = balloonBossPlayerSlots[y][x];
          const hue = (sn * 47 + 320) % 360;
          ctx.fillStyle = 'hsla(' + hue + ', 72%, 52%, 0.4)';
          ctx.fillRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          ctx.strokeStyle = 'hsla(' + hue + ', 88%, 62%, 0.95)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
          ctx.lineWidth = 1;
          ctx.fillStyle = '#ffe0ff';
          ctx.font = 'bold 12px sans-serif';
          ctx.textAlign = 'center';
          ctx.fillText('P' + sn, tx + tileSize / 2, ty + tileSize / 2 + 4);
          ctx.textAlign = 'left';
        }
        if (gtDraw === 'balloon_boss' && balloonBossBossSpawn && balloonBossBossSpawn.x === x && balloonBossBossSpawn.y === y) {
          ctx.fillStyle = 'rgba(255, 80, 120, 0.42)';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.strokeStyle = 'rgba(255, 120, 200, 0.95)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.lineWidth = 1;
          ctx.fillStyle = '#1a1b26';
          ctx.font = 'bold 11px sans-serif';
          ctx.textAlign = 'center';
          ctx.fillText('BOSS', tx + tileSize / 2, ty + tileSize / 2 + 4);
          ctx.textAlign = 'left';
        }
        if (gtDraw === 'quiz_carry') {
          if (quizQuestionArea[y] && quizQuestionArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(255, 214, 102, 0.44)';
            ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.strokeStyle = 'rgba(224, 185, 70, 0.96)';
            ctx.lineWidth = 2;
            ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.lineWidth = 1;
            ctx.fillStyle = '#1a1b26';
            ctx.font = 'bold 9px sans-serif';
            ctx.textAlign = 'center';
            ctx.fillText('Q', tx + tileSize / 2, ty + tileSize / 2 + 3);
            ctx.textAlign = 'left';
          }
          const ov = quizCarryOptionArea[y] && quizCarryOptionArea[y][x];
          if (quizCarryHubArea[y] && quizCarryHubArea[y][x] === 1) {
            ctx.fillStyle = 'rgba(187, 154, 247, 0.45)';
            ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.strokeStyle = 'rgba(200, 170, 255, 0.95)';
            ctx.lineWidth = 2;
            ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
            ctx.lineWidth = 1;
          }
          if (ov >= 1 && ov <= QUIZ_CARRY_EDITOR_OPT_COUNT) {
            const pal = quizCarryEditorDrawPalette(ov);
            ctx.fillStyle = pal.fill;
            ctx.fillRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
            ctx.strokeStyle = pal.stroke;
            ctx.strokeRect(tx + 3, ty + 3, tileSize - 6, tileSize - 6);
            ctx.fillStyle = '#1a1b26';
            const lab = String(ov);
            ctx.font = lab.length > 1 ? 'bold 10px sans-serif' : 'bold 11px sans-serif';
            ctx.textAlign = 'center';
            ctx.fillText(lab, tx + tileSize / 2, ty + tileSize / 2 + 4);
            ctx.textAlign = 'left';
          }
          if (carryEmbedCountdownArea[y] && Number(carryEmbedCountdownArea[y][x]) === 1) {
            ctx.fillStyle = 'rgba(100, 230, 255, 0.32)';
            ctx.fillRect(tx + 4, ty + 4, tileSize - 8, tileSize - 8);
            ctx.strokeStyle = 'rgba(80, 220, 255, 0.88)';
            ctx.lineWidth = 2;
            ctx.strokeRect(tx + 4, ty + 4, tileSize - 8, tileSize - 8);
            ctx.lineWidth = 1;
            ctx.fillStyle = '#1a3a44';
            ctx.font = 'bold 9px sans-serif';
            ctx.textAlign = 'center';
            ctx.fillText('321', tx + tileSize / 2, ty + tileSize / 2 + 3);
            ctx.textAlign = 'left';
          }
        }
        if (gtDraw === 'quiz_battle' && quizBattlePathArea[y] && quizBattlePathArea[y][x] === 1) {
          ctx.fillStyle = 'rgba(186, 130, 255, 0.4)';
          ctx.fillRect(tx + 1, ty + 1, tileSize - 2, tileSize - 2);
          ctx.strokeStyle = 'rgba(210, 170, 255, 0.72)';
          ctx.lineWidth = 1;
          ctx.strokeRect(tx + 1, ty + 1, tileSize - 2, tileSize - 2);
        }
        if (gtDraw === 'quiz_battle' && quizBattleDomeArea[y] && quizBattleDomeArea[y][x] === 1) {
          ctx.fillStyle = 'rgba(100, 200, 255, 0.42)';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.strokeStyle = 'rgba(255, 100, 130, 0.92)';
          ctx.lineWidth = 2;
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, tileSize - 4);
          ctx.lineWidth = 1;
          ctx.fillStyle = '#1a1b26';
          ctx.font = 'bold 10px sans-serif';
          ctx.textAlign = 'center';
          ctx.fillText('E', tx + tileSize / 2, ty + tileSize / 2 + 3);
          ctx.textAlign = 'left';
        }
      }
    }
    /* จุดเกิด + footprint กว้าง×สูง — ต้องวาดหลังลูปกริด ไม่งั้นช่องข้างเคียงจะทับสีเขียวจนเหลือแค่มุม/ครึ่งวง */
    if (spawn && spawn.x >= 0 && spawn.y >= 0 && spawn.x < width && spawn.y < height) {
      const fp = readCharacterFootprintInputs();
      const cw0 = fp.cw, ch0 = fp.ch;
      const effW = Math.max(1, Math.min(cw0, width - spawn.x));
      const effH = Math.max(1, Math.min(ch0, height - spawn.y));
      const tx0 = spawn.x * tileSize;
      const ty0 = spawn.y * tileSize;
      const rw = effW * tileSize;
      const rh = effH * tileSize;
      const cx0 = tx0 + rw / 2;
      const cy0 = ty0 + rh / 2;
      ctx.fillStyle = 'rgba(158,206,106,0.35)';
      ctx.fillRect(tx0 + 1, ty0 + 1, rw - 2, rh - 2);
      ctx.strokeStyle = '#9ece6a';
      ctx.lineWidth = 2;
      ctx.strokeRect(tx0 + 1, ty0 + 1, rw - 2, rh - 2);
      ctx.fillStyle = 'rgba(158,206,106,0.7)';
      ctx.beginPath();
      ctx.arc(cx0, cy0, Math.min(tileSize / 3, Math.min(rw, rh) / 4), 0, Math.PI * 2);
      ctx.fill();
      ctx.strokeStyle = '#9ece6a';
      ctx.stroke();
      const colW0 = Math.max(1, Math.min(fp.cw, fp.colW));
      const colH0 = Math.max(1, Math.min(fp.ch, fp.colH));
      const colWEff = Math.max(1, Math.min(colW0, effW));
      const colHEff = Math.max(1, Math.min(colH0, effH));
      if (colWEff < effW || colHEff < effH) {
        const ox = spawn.x + Math.floor((effW - colWEff) / 2);
        const oy = spawn.y + (effH - colHEff);
        const tcx = ox * tileSize;
        const tcy = oy * tileSize;
        const trw = colWEff * tileSize;
        const trh = colHEff * tileSize;
        ctx.save();
        ctx.setLineDash([5, 4]);
        ctx.strokeStyle = 'rgba(224, 175, 104, 0.95)';
        ctx.lineWidth = 2;
        ctx.strokeRect(tcx + 2, tcy + 2, trw - 4, trh - 4);
        ctx.restore();
      }
    }
    if (isFrogger && lanes.length) {
      const timeMs = Date.now();
      for (let y = 0; y < height; y++) {
        const lane = lanes.find(l => l.y === y);
        if (!lane || (lane.type !== 'road' && lane.type !== 'water')) continue;
        const positions = getVehiclePositionsEditor(lane, timeMs);
        const isRoad = lane.type === 'road';
        for (let i = 0; i < positions.length; i++) {
          const vx = positions[i];
          const tx = vx * tileSize, ty = y * tileSize;
          ctx.fillStyle = isRoad ? '#e0a060' : '#8b7355';
          ctx.fillRect(tx + 2, ty + 2, tileSize - 4, (tileSize - 4) * 0.7);
          ctx.strokeStyle = isRoad ? '#c0caf5' : '#9ece6a';
          ctx.strokeRect(tx + 2, ty + 2, tileSize - 4, (tileSize - 4) * 0.7);
        }
      }
      ctx.fillStyle = '#7aa2f7';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('โหมดกบข้ามถนน (จำลองรถ/ท่อนซุง)', 8, 20);
    }
    if (isGauntlet) {
      ctx.fillStyle = '#f7768e';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText(gauntletPlayerSpawns.length
        ? 'พรมแดง — ลำดับ 1–6 จากโหมด «ลำดับเกิด» (คลิกซ้ายตามลำดับ)'
        : 'พรมแดง — ช่องฟ้า = ลำดับ 1→6 อัตโนมัติ (y บน→ล่าง) หรือใช้โหมดลำดับเกิดกำหนดเอง', 8, 20);
      const drawGNum = (s, num) => {
        const cx = s.x * tileSize + tileSize / 2;
        const cy = s.y * tileSize + tileSize / 2 + 4;
        ctx.fillStyle = 'rgba(0,0,0,0.5)';
        ctx.beginPath();
        ctx.arc(cx, cy - 3, 12, 0, Math.PI * 2);
        ctx.fill();
        ctx.fillStyle = '#ffffff';
        ctx.font = 'bold 14px sans-serif';
        ctx.textAlign = 'center';
        ctx.fillText(String(num), cx, cy + 2);
        ctx.textAlign = 'left';
      };
      if (gauntletLaserRowStart != null && gauntletLaserRowEnd != null) {
        let y0 = Math.max(0, Math.min(height - 1, gauntletLaserRowStart));
        let y1 = Math.max(0, Math.min(height - 1, gauntletLaserRowEnd));
        if (y1 < y0) { const t = y0; y0 = y1; y1 = t; }
        const x0 = 2;
        const x1 = width * tileSize - 2;
        ctx.save();
        ctx.fillStyle = 'rgba(255, 80, 140, 0.12)';
        ctx.fillRect(x0, y0 * tileSize, x1 - x0, (y1 - y0 + 1) * tileSize);
        ctx.strokeStyle = 'rgba(255, 140, 180, 0.9)';
        ctx.lineWidth = 2;
        ctx.setLineDash([7, 5]);
        ctx.beginPath();
        ctx.moveTo(x0, y0 * tileSize + 1);
        ctx.lineTo(x1, y0 * tileSize + 1);
        ctx.moveTo(x0, (y1 + 1) * tileSize - 1);
        ctx.lineTo(x1, (y1 + 1) * tileSize - 1);
        ctx.stroke();
        ctx.setLineDash([]);
        ctx.fillStyle = 'rgba(255, 200, 220, 0.95)';
        ctx.font = 'bold 11px ui-monospace, Consolas, sans-serif';
        ctx.fillText('laser y=' + y0 + '…' + y1, x0 + 4, y0 * tileSize + 14);
        ctx.restore();
      }
      if (gauntletPlayerSpawns.length) {
        for (let i = 0; i < gauntletPlayerSpawns.length; i++) {
          const s = gauntletPlayerSpawns[i];
          if (!s || s.x < 0 || s.x >= width || s.y < 0 || s.y >= height) continue;
          if (objects[s.y][s.x] === 1) continue;
          drawGNum(s, i + 1);
        }
      } else {
        ensureSpawnArea();
        const gsSlots = [];
        for (let yy = 0; yy < height; yy++) {
          for (let xx = 0; xx < width; xx++) {
            if (spawnArea[yy] && spawnArea[yy][xx] === 1 && objects[yy][xx] !== 1) gsSlots.push({ x: xx, y: yy });
          }
        }
        gsSlots.sort((a, b) => a.y - b.y || a.x - b.x);
        for (let i = 0; i < Math.min(6, gsSlots.length); i++) drawGNum(gsSlots[i], i + 1);
      }
    }
    if (gtDraw === 'lobby') {
      ctx.fillStyle = '#bb9af7';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('โหมดห้องโถง (ฉากรอผู้เล่น)', 8, 20);
    }
    if (gtDraw === 'quiz') {
      ctx.fillStyle = '#f7768e';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('โหมดตอบคำถาม (ถูก/ผิด)', 8, 20);
    }
    if (isStack) {
      ctx.fillStyle = '#7dcfff';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('Stack — ฟ้า = ปล่อยบล็อก · ชมพู = แพลตฟอร์ม · บันทึกแล้วกดทดลองเล่น (Space ปล่อย)', 8, 20);
    }
    if (isQuizCarry) {
      ctx.fillStyle = '#bb9af7';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('หยิบมาวาง — ม่วง = กลาง · 1–16 = ตัวเลือก · บันทึกแล้วทดลองเล่น', 8, 20);
    }
    if (isSpaceShooter) {
      ctx.fillStyle = '#7df9ff';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('ยิงยาน — วาดจุดเกิด P1–P6 · แนะนำพื้นหลังอวกาศ + ปิดโชว์กริดในเกม', 8, 20);
    }
    if (isBalloonBoss) {
      ctx.fillStyle = '#ff79c6';
      ctx.font = 'bold 14px sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('ลูกโป้งยิงบอส — P1–P6 + โหมด BOSS 1 ช่อง · ปิดโชว์กริดในเกมให้เหมือนรีเฟอเรนซ์', 8, 20);
    }
    if (supportsLobbySpawnPaint(gtDraw)) {
      ensureLobbyPlayerSpawnsLength();
      let anyLobbyP = false;
      for (let ii = 0; ii < 6; ii++) {
        if (lobbyPlayerSpawns[ii]) { anyLobbyP = true; break; }
      }
      if (anyLobbyP) {
        const drawLobbyPNum = (s, num) => {
          if (!s || s.x < 0 || s.x >= width || s.y < 0 || s.y >= height) return;
          if (objects[s.y][s.x] === 1) return;
          const cx = s.x * tileSize + tileSize / 2;
          const cy = s.y * tileSize + tileSize / 2 + 4;
          ctx.fillStyle = 'rgba(0,80,120,0.55)';
          ctx.beginPath();
          ctx.arc(cx, cy - 3, 12, 0, Math.PI * 2);
          ctx.fill();
          ctx.fillStyle = '#b4f9f8';
          ctx.font = 'bold 13px sans-serif';
          ctx.textAlign = 'center';
          ctx.fillText('P' + String(num), cx, cy + 2);
          ctx.textAlign = 'left';
        };
        for (let i = 0; i < 6; i++) {
          const s = lobbyPlayerSpawns[i];
          if (s) drawLobbyPNum(s, i + 1);
        }
      }
    }
      const fpHud = readCharacterFootprintInputs();
    ctx.fillStyle = '#c0caf5';
    ctx.font = '12px sans-serif';
    ctx.textAlign = 'left';
    const colLine = (fpHud.colW < fpHud.cw || fpHud.colH < fpHud.ch)
      ? ' · ชนกำแพง ' + fpHud.colW + '×' + fpHud.colH + ' (เท้า/กลาง — เส้นประส้ม · เฉพาะกำแพง; โซนอื่นใช้ ' + fpHud.ch + '×' + fpHud.cw + ')'
      : '';
    ctx.fillText('ขนาดตัวละคร: สูง ' + fpHud.ch + ' × กว้าง ' + fpHud.cw + ' ช่อง (แนวตั้ง×แนวนอน · มุมซ้ายบนจุดเกิด)' + colLine, 8, canvas.height - 8);
  }

  function editorFroggerTick() {
    const gt = gameTypeEl ? gameTypeEl.value : '';
    if (gt !== 'frogger') return;
    draw();
    editorFroggerAnimationId = requestAnimationFrame(editorFroggerTick);
  }

  function getCellColorWithAlpha() {
    const colorEl = document.getElementById('cell-color');
    const alphaEl = document.getElementById('cell-alpha');
    if (!colorEl) return null;
    const hex = colorEl.value;
    const r = parseInt(hex.slice(1, 3), 16);
    const g = parseInt(hex.slice(3, 5), 16);
    const b = parseInt(hex.slice(5, 7), 16);
    const a = alphaEl ? parseInt(alphaEl.value, 10) / 100 : 1;
    return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';
  }

  function setCell(x, y, left, mouseEv) {
    if (drawModeEl.value === 'gauntletLaserStart' || drawModeEl.value === 'gauntletLaserEnd') {
      const gt = gameTypeEl ? gameTypeEl.value : gameType;
      if (gt !== 'gauntlet') return;
      if (!left) {
        gauntletLaserRowStart = null;
        gauntletLaserRowEnd = null;
        if (statusEl) statusEl.textContent = 'ล้างช่วงแนวตั้ง laser แล้ว — ใช้เต็มความสูงแมป';
        draw();
        return;
      }
      const yy = Math.max(0, Math.min(height - 1, y));
      if (drawModeEl.value === 'gauntletLaserStart') gauntletLaserRowStart = yy;
      else gauntletLaserRowEnd = yy;
      sanitizeGauntletLaserRowsInEditor();
      if (statusEl) {
        const a = gauntletLaserRowStart;
        const b = gauntletLaserRowEnd;
        statusEl.textContent = (a != null && b != null)
          ? ('เลเซอร์: แถว ' + a + '–' + b + ' (แนวตั้ง · คลิกขวา = ล้างทั้งช่วง)')
          : ('เลเซอร์: ตั้งแถว ' + yy + ' แล้ว — เลือกโหมดอีกแถวเพื่อกำหนดขอบอีกด้าน');
      }
      draw();
      return;
    }
    if (drawModeEl.value === 'gauntletPlayerSpawn') {
      const gt = gameTypeEl ? gameTypeEl.value : gameType;
      if (gt !== 'gauntlet') return;
      if (objects[y][x] === 1) {
        if (statusEl) statusEl.textContent = 'ช่องกำแพง — ใช้เป็นจุดเกิดไม่ได้';
        return;
      }
      if (left) {
        if (gauntletPlayerSpawns.some((s) => s.x === x && s.y === y)) return;
        if (gauntletPlayerSpawns.length >= 6) {
          if (statusEl) statusEl.textContent = 'ครบ 6 จุดแล้ว — คลิกขวาที่ช่องเพื่อถอด หรือปุ่มล้างลำดับ';
          return;
        }
        gauntletPlayerSpawns.push({ x, y });
        if (statusEl) statusEl.textContent = 'พรมแดง: ผู้เล่น ' + gauntletPlayerSpawns.length + ' = ช่อง (' + x + ',' + y + ')';
      } else {
        const before = gauntletPlayerSpawns.length;
        gauntletPlayerSpawns = gauntletPlayerSpawns.filter((s) => !(s.x === x && s.y === y));
        if (statusEl) {
          statusEl.textContent = before > gauntletPlayerSpawns.length ? 'ถอดจุดเกิดที่ช่องนี้แล้ว' : 'ไม่มีจุดเกิดที่ช่องนี้';
        }
      }
      return;
    }
    if (drawModeEl.value === 'lobbyPlayerSpawn') {
      const gt = gameTypeEl ? gameTypeEl.value : gameType;
      if (!supportsLobbySpawnPaint(gt)) return;
      const slotEl = document.getElementById('lobby-slot-paint');
      const slotOne = parseInt(slotEl && slotEl.value, 10) || 1;
      const slot = Math.max(0, Math.min(5, slotOne - 1));
      ensureLobbyPlayerSpawnsLength();
      if (objects[y][x] === 1) {
        if (statusEl) statusEl.textContent = 'ช่องกำแพง — ใช้เป็นจุดเกิดไม่ได้';
        return;
      }
      if (left) {
        for (let k = 0; k < 6; k++) {
          if (k === slot) continue;
          const o = lobbyPlayerSpawns[k];
          if (o && o.x === x && o.y === y) lobbyPlayerSpawns[k] = null;
        }
        lobbyPlayerSpawns[slot] = { x, y };
        if (statusEl) statusEl.textContent = 'จุดเกิด P' + (slot + 1) + ' = (' + x + ',' + y + ')';
      } else {
        let cleared = false;
        for (let k = 0; k < 6; k++) {
          const o = lobbyPlayerSpawns[k];
          if (o && o.x === x && o.y === y) {
            lobbyPlayerSpawns[k] = null;
            cleared = true;
          }
        }
        if (statusEl) statusEl.textContent = cleared ? 'ถอดจุด P ที่ช่องนี้แล้ว' : 'ไม่มีจุด P ที่ช่องนี้';
      }
      return;
    }
    if (drawModeEl.value === 'cellImage') {
      if (objects[y][x] === 1) {
        if (statusEl) statusEl.textContent = 'ช่องกำแพง — วางรูปบนกริดไม่ได้';
        return;
      }
      const gtCell = gameTypeEl ? gameTypeEl.value : gameType;
      if (left && mouseEv && mouseEv.altKey && gtCell === 'quiz_carry') {
        const hit = findSpriteIndexAtCell(x, y);
        if (hit >= 0) {
          const bind = readSpriteCarryBindFromSelect();
          if (bind == null) delete gridImageSprites[hit].bindCarryOption;
          else gridImageSprites[hit].bindCarryOption = bind;
          sanitizeSpritesInPlace();
          if (statusEl) {
            statusEl.textContent = bind == null
              ? 'สไปรต์: ผูกแบบอัตโนมัติ (นับจากช่องโซนตัวเลือกที่ทับสไปรต์)'
              : ('ผูกสไปรต์กับตัวเลือกข้อ ' + bind + ' แล้ว (Alt+คลิกซ้ายอีกครั้งเปลี่ยนค่าในรายการ)');
          }
          return;
        }
        if (statusEl) statusEl.textContent = 'ไม่มีสไปรต์ในช่องนี้ — Alt+คลิกบนพื้นที่ที่มีรูป';
        return;
      }
      const wEl = document.getElementById('grid-image-brush-w');
      const hEl = document.getElementById('grid-image-brush-h');
      const bw = Math.max(1, parseInt(wEl && wEl.value, 10) || 1);
      const bh = Math.max(1, parseInt(hEl && hEl.value, 10) || 1);
      if (left) {
        if (!gridImageLibrary.length) {
          if (statusEl) statusEl.textContent = 'อัปโหลดรูปเข้าคลังก่อน (หรือโหลดฉากที่มีคลังรูป)';
          return;
        }
        const bi = gridImageBrushIndex;
        if (bi < 0 || bi >= gridImageLibrary.length) {
          if (statusEl) statusEl.textContent = 'คลิกเลือกรูปในแกลเลอรีก่อนวาง';
          return;
        }
        const placed = canPlaceSpriteAt(x, y, bw, bh, bi);
        if (!placed) {
          if (statusEl) statusEl.textContent = 'วางไม่ได้ — มีกำแพงในพื้นที่ หรือลดกว้าง/สูง';
          return;
        }
        removeSpritesOverlappingRect(placed.x, placed.y, placed.w, placed.h);
        gridImageSprites.push(placed);
        draw();
        if (statusEl) statusEl.textContent = 'วางรูป ' + placed.w + '×' + placed.h + ' ช่องที่ (' + placed.x + ',' + placed.y + ')';
      } else {
        const hit = findSpriteIndexAtCell(x, y);
        if (hit >= 0) {
          gridImageSprites.splice(hit, 1);
          draw();
          if (statusEl) statusEl.textContent = 'ลบสไปรต์รูปแล้ว';
        }
      }
      return;
    }
    if (drawModeEl.value === 'wall') {
      objects[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'interactive') {
      if (!interactive[y]) interactive[y] = Array(width).fill(0);
      interactive[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'spawnArea') {
      const gt = gameTypeEl ? gameTypeEl.value : gameType;
      if (gt === 'frogger') return;
      ensureSpawnArea();
      spawnArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'startGame') {
      const gt = gameTypeEl ? gameTypeEl.value : gameType;
      if (gt !== 'lobby') return;
      ensureStartGameArea();
      startGameArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'quizTrue') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'quiz') return;
      ensureQuizAreas();
      quizTrueArea[y][x] = left ? 1 : 0;
      if (left) quizFalseArea[y][x] = 0;
    } else if (drawModeEl.value === 'quizFalse') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'quiz') return;
      ensureQuizAreas();
      quizFalseArea[y][x] = left ? 1 : 0;
      if (left) quizTrueArea[y][x] = 0;
    } else if (drawModeEl.value === 'quizQuestion') {
      const gtq = gameTypeEl ? gameTypeEl.value : gameType;
      if (gtq === 'quiz') {
        ensureQuizAreas();
        quizQuestionArea[y][x] = left ? 1 : 0;
      } else if (gtq === 'quiz_carry') {
        ensureQuizCarryAreas();
        quizQuestionArea[y][x] = left ? 1 : 0;
        if (left) carryEmbedCountdownArea[y][x] = 0;
      } else return;
    } else if (drawModeEl.value === 'stackRelease') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'stack') return;
      ensureStackAreas();
      stackReleaseArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'stackLand') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'stack') return;
      ensureStackAreas();
      stackLandArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'jumpSurvivePlatform') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'jump_survive') return;
      ensureJumpSurvivePlatformArea();
      jumpSurvivePlatformArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'shooterSpawnPaint') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'space_shooter') return;
      ensureShooterSpawnSlots();
      if (objects[y][x] === 1) {
        if (statusEl) statusEl.textContent = 'ช่องกำแพง — ใช้เป็นจุดเกิดยานไม่ได้';
        return;
      }
      const slotEl = document.getElementById('shooter-slot-paint');
      const slot = Math.max(1, Math.min(6, parseInt(slotEl && slotEl.value, 10) || 1));
      if (left) {
        for (let yy = 0; yy < height; yy++) {
          for (let xx = 0; xx < width; xx++) {
            if (shooterSpawnSlots[yy] && shooterSpawnSlots[yy][xx] === slot) shooterSpawnSlots[yy][xx] = 0;
          }
        }
        shooterSpawnSlots[y][x] = slot;
        if (statusEl) statusEl.textContent = 'ยาน P' + slot + ' → ช่อง (' + x + ',' + y + ')';
      } else {
        shooterSpawnSlots[y][x] = 0;
        if (statusEl) statusEl.textContent = 'ลบจุดเกิดยานที่ช่อง (' + x + ',' + y + ')';
      }
      return;
    } else if (drawModeEl.value === 'balloonBossPlayerPaint') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'balloon_boss') return;
      ensureBalloonBossPlayerSlots();
      if (objects[y][x] === 1) {
        if (statusEl) statusEl.textContent = 'ช่องกำแพง — ใช้เป็นจุดเกิดผู้เล่นไม่ได้';
        return;
      }
      const slotEl = document.getElementById('balloon-boss-slot-paint');
      const slot = Math.max(1, Math.min(6, parseInt(slotEl && slotEl.value, 10) || 1));
      if (left) {
        for (let yy = 0; yy < height; yy++) {
          for (let xx = 0; xx < width; xx++) {
            if (balloonBossPlayerSlots[yy] && balloonBossPlayerSlots[yy][xx] === slot) balloonBossPlayerSlots[yy][xx] = 0;
          }
        }
        balloonBossPlayerSlots[y][x] = slot;
        if (statusEl) statusEl.textContent = 'ผู้เล่น P' + slot + ' → ช่อง (' + x + ',' + y + ')';
      } else {
        balloonBossPlayerSlots[y][x] = 0;
        if (statusEl) statusEl.textContent = 'ลบจุดเกิดผู้เล่นที่ช่อง (' + x + ',' + y + ')';
      }
      return;
    } else if (drawModeEl.value === 'balloonBossBossPaint') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'balloon_boss') return;
      if (objects[y][x] === 1) {
        if (statusEl) statusEl.textContent = 'ช่องกำแพง — ใช้เป็นจุดเกิดบอสไม่ได้';
        return;
      }
      if (left) {
        balloonBossBossSpawn = { x: x, y: y };
        if (statusEl) statusEl.textContent = 'บอส → ช่อง (' + x + ',' + y + ')';
      } else {
        balloonBossBossSpawn = null;
        if (statusEl) statusEl.textContent = 'ลบจุดเกิดบอส (เกมจะใช้กลางแมป)';
      }
      return;
    } else if (drawModeEl.value === 'quizBattlePath') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'quiz_battle') return;
      ensureQuizBattlePathArea();
      quizBattlePathArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'quizBattleDome') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'quiz_battle') return;
      ensureQuizBattleDomeArea();
      quizBattleDomeArea[y][x] = left ? 1 : 0;
    } else if (drawModeEl.value === 'carryEmbedCountdown') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'quiz_carry') return;
      ensureQuizCarryAreas();
      if (left) {
        carryEmbedCountdownArea[y][x] = 1;
        quizCarryHubArea[y][x] = 0;
        quizCarryOptionArea[y][x] = 0;
      } else {
        carryEmbedCountdownArea[y][x] = 0;
      }
    } else if (drawModeEl.value === 'quizCarryHub') {
      if ((gameTypeEl ? gameTypeEl.value : gameType) !== 'quiz_carry') return;
      ensureQuizCarryAreas();
      quizCarryHubArea[y][x] = left ? 1 : 0;
      if (left) {
        quizCarryOptionArea[y][x] = 0;
        carryEmbedCountdownArea[y][x] = 0;
      }
    } else {
      const carryOptM = /^quizCarryOpt(\d+)$/.exec(drawModeEl.value);
      if (carryOptM && (gameTypeEl ? gameTypeEl.value : gameType) === 'quiz_carry') {
        ensureQuizCarryAreas();
        const val = parseInt(carryOptM[1], 10);
        if (val >= 1 && val <= QUIZ_CARRY_EDITOR_OPT_COUNT) {
          if (left) {
            quizCarryOptionArea[y][x] = val;
            quizCarryHubArea[y][x] = 0;
            carryEmbedCountdownArea[y][x] = 0;
          } else {
            quizCarryOptionArea[y][x] = 0;
          }
        }
      } else if (drawModeEl.value === 'color') {
        if (!cellColors[y]) cellColors[y] = Array(width).fill(null);
        cellColors[y][x] = left ? getCellColorWithAlpha() : null;
      } else {
        if (!blockPlayer[y]) blockPlayer[y] = Array(width).fill(0);
        blockPlayer[y][x] = left ? 1 : 0;
      }
    }
  }

  canvas.addEventListener('mousedown', (e) => {
    const { x, y } = getCell(e);
    if (isSpawnMode) {
      if (objects[y][x] === 0) { spawn = { x, y }; draw(); statusEl.textContent = 'จุดเกิด: ' + x + ',' + y; }
      isSpawnMode = false;
      document.getElementById('btn-spawn').textContent = 'ตั้งจุดเกิด';
      return;
    }
    setCell(x, y, e.button === 0, e);
    draw();
  });
  canvas.addEventListener('contextmenu', (e) => e.preventDefault());
  canvas.addEventListener('mousemove', (e) => {
    if (e.buttons !== 1 && e.buttons !== 2) return;
    const { x, y } = getCell(e);
    setCell(x, y, e.buttons === 1, e);
    draw();
  });

  if (mapLoadEl) {
    fetch(BASE + '/api/maps')
      .then(r => r.json())
      .then(list => {
        mapLoadEl.innerHTML = '<option value="">— เลือกฉากเดิม —</option>';
        (list || []).forEach(m => {
          const opt = document.createElement('option');
          opt.value = m.id;
          opt.textContent = (m.name || m.id) + ' (' + m.id + ')';
          mapLoadEl.appendChild(opt);
        });
        if (mapId) mapLoadEl.value = mapId;
      })
      .catch(() => { mapLoadEl.innerHTML = '<option value="">— เลือกฉากเดิม —</option>'; });
    document.getElementById('btn-load').addEventListener('click', () => {
      const id = mapLoadEl && mapLoadEl.value;
      if (id) window.location.href = 'editor.html' + buildEditorSearch(id);
    });
  }

  const bgInput = document.getElementById('bg-image');
  if (bgInput) {
    bgInput.addEventListener('change', (e) => {
      const file = e.target.files && e.target.files[0];
      if (!file) return;
      const r = new FileReader();
      r.onload = () => {
        backgroundImage = r.result;
        backgroundImageImg = new Image();
        backgroundImageImg.onload = () => { draw(); };
        backgroundImageImg.src = backgroundImage;
      };
      r.readAsDataURL(file);
      e.target.value = '';
    });
  }
  document.getElementById('btn-clear-bg').addEventListener('click', () => {
    backgroundImage = null;
    backgroundImageImg = null;
    draw();
  });

  (function wireEditorBgScrollUi() {
    if (!isEditorScrollBgMap()) return;
    syncEditorBgScrollUiFromConfig();
    const en = document.getElementById('editor-bg-scroll-enabled');
    const sp = document.getElementById('editor-bg-scroll-speed');
    if (en) {
      en.addEventListener('change', () => {
        editorBgScrollConfig.enabled = !!en.checked;
        if (editorBgScrollConfig.enabled) startEditorBgScrollRaf();
        else stopEditorBgScrollRaf();
        draw();
      });
    }
    if (sp) {
      sp.addEventListener('change', () => {
        editorBgScrollConfig.speedPxPerSec = Math.max(8, Math.min(400, Math.floor(Number(sp.value)) || 56));
      });
    }
    const dirSel = document.getElementById('editor-bg-scroll-direction');
    if (dirSel) {
      dirSel.addEventListener('change', () => {
        editorBgScrollConfig.scrollDirection = dirSel.value === 'down' ? 'down' : 'up';
        syncEditorBgScrollInitialToBottom();
        draw();
        if (editorBgScrollConfig.enabled) startEditorBgScrollRaf();
      });
    }
    const introF = document.getElementById('editor-bg-scroll-intro-file');
    if (introF) {
      introF.addEventListener('change', (e) => {
        const file = e.target.files && e.target.files[0];
        if (!file) return;
        const r = new FileReader();
        r.onload = () => {
          editorBgScrollConfig.introImage = r.result;
          loadEditorBgScrollImagePair(editorBgScrollConfig.introImage, editorBgScrollConfig.loopImage || EDITOR_SCROLL_BG_DEFAULT_LOOP, () => {
            syncEditorBgScrollInitialToBottom();
            draw();
            if (editorBgScrollConfig.enabled) startEditorBgScrollRaf();
          });
        };
        r.readAsDataURL(file);
        e.target.value = '';
      });
    }
    const loopF = document.getElementById('editor-bg-scroll-loop-file');
    if (loopF) {
      loopF.addEventListener('change', (e) => {
        const file = e.target.files && e.target.files[0];
        if (!file) return;
        const r = new FileReader();
        r.onload = () => {
          editorBgScrollConfig.loopImage = r.result;
          loadEditorBgScrollImagePair(editorBgScrollConfig.introImage || EDITOR_SCROLL_BG_DEFAULT_INTRO, editorBgScrollConfig.loopImage, () => {
            syncEditorBgScrollInitialToBottom();
            draw();
            if (editorBgScrollConfig.enabled) startEditorBgScrollRaf();
          });
        };
        r.readAsDataURL(file);
        e.target.value = '';
      });
    }
    const btnR = document.getElementById('editor-bg-scroll-reset-assets');
    if (btnR) {
      btnR.addEventListener('click', () => {
        editorBgScrollConfig.introImage = null;
        editorBgScrollConfig.loopImage = null;
        loadEditorBgScrollImagePair(EDITOR_SCROLL_BG_DEFAULT_INTRO, EDITOR_SCROLL_BG_DEFAULT_LOOP, () => {
          syncEditorBgScrollUiFromConfig();
          syncEditorBgScrollInitialToBottom();
          draw();
          if (editorBgScrollConfig.enabled) startEditorBgScrollRaf();
        });
      });
    }
  })();
  if (isEditorScrollBgMap()) applyEditorBgScrollFromMap({});

  document.getElementById('btn-new').addEventListener('click', initGrid);
  document.getElementById('btn-spawn').addEventListener('click', () => {
    isSpawnMode = true;
    document.getElementById('btn-spawn').textContent = 'คลิกช่องที่ต้องการ';
  });
  if (gameTypeEl) gameTypeEl.addEventListener('change', () => {
    gameType = gameTypeEl.value;
    if (drawModeEl && drawModeEl.value === 'startGame' && gameType !== 'lobby') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'spawnArea' && gameType === 'frogger') drawModeEl.value = 'wall';
    if (drawModeEl && (drawModeEl.value === 'quizTrue' || drawModeEl.value === 'quizFalse') && gameType !== 'quiz') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'quizQuestion' && gameType !== 'quiz' && gameType !== 'quiz_carry') drawModeEl.value = 'wall';
    if (drawModeEl && (drawModeEl.value === 'stackRelease' || drawModeEl.value === 'stackLand') && gameType !== 'stack') drawModeEl.value = 'wall';
    if (drawModeEl && quizCarryEditorCarryModes().indexOf(drawModeEl.value) >= 0 && gameType !== 'quiz_carry') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'jumpSurvivePlatform' && gameType !== 'jump_survive') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'gauntletPlayerSpawn' && gameType !== 'gauntlet') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'gauntletLaserStart' && gameType !== 'gauntlet') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'gauntletLaserEnd' && gameType !== 'gauntlet') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'shooterSpawnPaint' && gameType !== 'space_shooter') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'balloonBossPlayerPaint' && gameType !== 'balloon_boss') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'balloonBossBossPaint' && gameType !== 'balloon_boss') drawModeEl.value = 'wall';
    if (drawModeEl && (drawModeEl.value === 'quizBattleDome' || drawModeEl.value === 'quizBattlePath') && gameType !== 'quiz_battle') drawModeEl.value = 'wall';
    if (drawModeEl && drawModeEl.value === 'lobbyPlayerSpawn' && !supportsLobbySpawnPaint(gameType)) drawModeEl.value = 'wall';
    toggleFroggerUI();
    syncGridImageBrushInputCaps();
    syncDrawModeAuxUi();
  });

  const btnClearGauntletSpawns = document.getElementById('btn-clear-gauntlet-spawns');
  if (btnClearGauntletSpawns) {
    btnClearGauntletSpawns.addEventListener('click', () => {
      gauntletPlayerSpawns = [];
      if (statusEl) statusEl.textContent = 'ล้างลำดับเกิดพรมแดง (1–6) แล้ว';
      draw();
    });
  }
  const btnClearGauntletLaserSpan = document.getElementById('btn-clear-gauntlet-laser-span');
  if (btnClearGauntletLaserSpan) {
    btnClearGauntletLaserSpan.addEventListener('click', () => {
      gauntletLaserRowStart = null;
      gauntletLaserRowEnd = null;
      if (statusEl) statusEl.textContent = 'ล้างช่วง laser — เลเซอร์ในเกมใช้เต็มความสูงแมปอีกครั้ง';
      draw();
    });
  }

  const lobbySpawnModeEl = document.getElementById('lobby-spawn-mode');
  if (lobbySpawnModeEl) {
    lobbySpawnModeEl.addEventListener('change', () => {
      if (lobbySpawnModeEl.value !== 'slots6' && drawModeEl && drawModeEl.value === 'lobbyPlayerSpawn') drawModeEl.value = 'wall';
      syncLobbySpawnAuxUi();
      draw();
    });
  }
  const btnClearLobbySpawns = document.getElementById('btn-clear-lobby-spawns');
  if (btnClearLobbySpawns) {
    btnClearLobbySpawns.addEventListener('click', () => {
      lobbyPlayerSpawns = [null, null, null, null, null, null];
      if (statusEl) statusEl.textContent = 'ล้างจุดเกิด P1–P6 แล้ว';
      draw();
    });
  }
  const lobbySlotPaintEl = document.getElementById('lobby-slot-paint');
  if (lobbySlotPaintEl) {
    lobbySlotPaintEl.addEventListener('change', () => { draw(); });
  }

  const btnClearShooterSpawns = document.getElementById('btn-clear-shooter-spawns');
  if (btnClearShooterSpawns) {
    btnClearShooterSpawns.addEventListener('click', () => {
      ensureShooterSpawnSlots();
      for (let yy = 0; yy < height; yy++) {
        for (let xx = 0; xx < width; xx++) shooterSpawnSlots[yy][xx] = 0;
      }
      if (statusEl) statusEl.textContent = 'ล้างจุดเกิดยานทั้งหมดแล้ว';
      draw();
    });
  }

  const btnClearBalloonBoss = document.getElementById('btn-clear-balloon-boss-spawns');
  if (btnClearBalloonBoss) {
    btnClearBalloonBoss.addEventListener('click', () => {
      ensureBalloonBossPlayerSlots();
      for (let yy = 0; yy < height; yy++) {
        for (let xx = 0; xx < width; xx++) balloonBossPlayerSlots[yy][xx] = 0;
      }
      balloonBossBossSpawn = null;
      if (statusEl) statusEl.textContent = 'ล้างจุดเกิดผู้เล่น + บอสแล้ว';
      draw();
    });
  }

  function openPlayTestMap() {
    const id = mapId && String(mapId).trim();
    if (!id) {
      if (statusEl) statusEl.textContent = 'บันทึกฉากก่อน จึงจะทดลองเล่นได้ (ต้องมีรหัสฉากใน URL)';
      try { alert('บันทึกฉากก่อน — ปุ่มทดลองเล่นต้องใช้รหัสฉากหลังบันทึก (แก้จากฉากเดิมแล้วกดบันทึก)'); } catch (e) { /* ignore */ }
      return;
    }
    const nick = 'ทดสอบ' + Math.floor(Math.random() * 9000 + 1000);
    if (statusEl) statusEl.textContent = 'กำลังสร้างห้องทดสอบ…';
    var maxPl = (gameTypeEl && (gameTypeEl.value === 'gauntlet' || gameTypeEl.value === 'space_shooter' || gameTypeEl.value === 'balloon_boss')) ? 6
      : (gameTypeEl && (gameTypeEl.value === 'stack' || gameTypeEl.value === 'quiz_carry' || gameTypeEl.value === 'quiz_battle' || gameTypeEl.value === 'jump_survive')) ? 8 : 4;
    fetch(BASE + '/api/spaces', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ mapId: id, isPrivate: true, name: 'preview', maxPlayers: maxPl }),
    })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        if (!data || !data.ok) {
          if (statusEl) statusEl.textContent = (data && data.error) || 'สร้างห้องทดสอบไม่ได้';
          return;
        }
        var sid = data.spaceId;
        var gt = gameTypeEl ? (gameTypeEl.value || 'zep') : 'zep';
        /* โถง lobby ต้องใช้ room-lobby (มีปุ่มเริ่มเกม + โซนส้ม) — play.html ไม่มี UI host */
        var page = gt === 'lobby' ? 'room-lobby.html' : 'play.html';
        var q = page + '?space=' + encodeURIComponent(sid)
          + '&nick=' + encodeURIComponent(nick)
          + '&map=' + encodeURIComponent(id)
          + '&preview=1&defaultChar=1&editorEmbed=1'
          + '&_h=' + Date.now();
        if (statusEl) statusEl.textContent = 'เปิดหน้าทดสอบเล่นในแท็บใหม่แล้ว — ปิดแท็บเมื่อเล่นเสร็จ';
        window.open(BASE + '/' + q, '_blank', 'noopener,noreferrer');
      })
      .catch(function () {
        if (statusEl) statusEl.textContent = 'สร้างห้องทดสอบไม่ได้';
      });
  }

  try { window.gameEditorOpenPlayTest = openPlayTestMap; } catch (e) { /* ignore */ }

  var btnPlayTest = document.getElementById('btn-play-test');
  if (btnPlayTest) btnPlayTest.addEventListener('click', openPlayTestMap);

  document.getElementById('btn-save').addEventListener('click', () => {
    const name = (mapName.value || '').trim() || 'ฉากใหม่';
    gameType = gameTypeEl ? (gameTypeEl.value || 'zep') : 'zep';
    if (gameType === 'frogger') ensureLanes();
    ensureInteractive();
    ensureStartGameArea();
    ensureSpawnArea();
    ensureQuizAreas();
    ensureQuizCarryAreas();
    ensureQuizBattleDomeArea();
    ensureQuizBattlePathArea();
    ensureJumpSurvivePlatformArea();
    ensureShooterSpawnSlots();
    ensureBalloonBossPlayerSlots();
    ensureStackAreas();
    const fpSave = readCharacterFootprintInputs();
    applyCharacterFootprintInputs(fpSave.cw, fpSave.ch);
    const bpSepSave = readBlockPlayerSeparationWHForSave();
    const showMapInGameEl = document.getElementById('show-map-in-game');
    showMapInGame = showMapInGameEl ? showMapInGameEl.checked : true;
    const body = {
      name, gameType, width, height, tileSize,
      characterCells: Math.max(fpSave.cw, fpSave.ch),
      characterCellsW: fpSave.cw,
      characterCellsH: fpSave.ch,
      characterCollisionW: fpSave.colW,
      characterCollisionH: fpSave.colH,
      blockPlayerSeparationW: bpSepSave.w,
      blockPlayerSeparationH: bpSepSave.h,
      ground, objects, blockPlayer, interactive, startGameArea, spawnArea, spawn, cellColors, showMapInGame,
      lobbySpawnMode: (() => {
        const el = document.getElementById('lobby-spawn-mode');
        const v = el && el.value;
        return (v === 'fixed' || v === 'slots6') ? v : 'random';
      })(),
      lobbyPlayerSpawns: (() => {
        ensureLobbyPlayerSpawnsLength();
        sanitizeLobbyPlayerSpawnsInEditor();
        return lobbyPlayerSpawns.map((s) => (s && Number.isFinite(s.x) && Number.isFinite(s.y)
          ? { x: Math.floor(s.x), y: Math.floor(s.y) }
          : null));
      })(),
      quizTrueArea, quizFalseArea, quizQuestionArea,
      quizCarryHubArea: gameType === 'quiz_carry' ? quizCarryHubArea.map(r => r.slice()) : [],
      quizCarryOptionArea: gameType === 'quiz_carry' ? quizCarryOptionArea.map(r => r.slice()) : [],
      carryEmbedCountdownArea: gameType === 'quiz_carry' ? carryEmbedCountdownArea.map(r => r.slice()) : [],
      carryEmbedCountdownHighlight: (() => {
        if (gameType !== 'quiz_carry') return false;
        const h = document.getElementById('carry-embed-countdown-highlight');
        return !h || !!h.checked;
      })(),
      carryEmbedCountdownHighlightColor: (() => {
        if (gameType !== 'quiz_carry') return undefined;
        const el = document.getElementById('carry-embed-countdown-color');
        return (el && el.value) ? el.value : '#ffb44a';
      })(),
      carryEmbedCountdownAnchor: (() => {
        if (gameType !== 'quiz_carry') return undefined;
        const el = document.getElementById('carry-embed-countdown-anchor');
        const v = el && el.value;
        if (v === 'grid' || v === 'map' || v === 'screen') return v;
        return 'map';
      })(),
      quizBattleDomeArea: gameType === 'quiz_battle' ? quizBattleDomeArea.map(r => r.slice()) : [],
      quizBattlePathArea: gameType === 'quiz_battle' ? quizBattlePathArea.map(r => r.slice()) : [],
      stackReleaseArea: gameType === 'stack' ? stackReleaseArea.map(r => r.slice()) : [],
      stackLandArea: gameType === 'stack' ? stackLandArea.map(r => r.slice()) : [],
      jumpSurvivePlatforms: gameType === 'jump_survive' ? jumpSurvivePlatforms.slice() : [],
      jumpSurvivePlatformArea: gameType === 'jump_survive' ? jumpSurvivePlatformArea.map((r) => r.slice()) : [],
      shooterSpawnSlots: gameType === 'space_shooter' ? shooterSpawnSlots.map((r) => r.slice()) : [],
      balloonBossPlayerSlots: gameType === 'balloon_boss' ? balloonBossPlayerSlots.map((r) => r.slice()) : [],
      balloonBossBossSpawn: gameType === 'balloon_boss' && balloonBossBossSpawn && Number.isFinite(balloonBossBossSpawn.x)
        ? { x: Math.floor(balloonBossBossSpawn.x), y: Math.floor(balloonBossBossSpawn.y) }
        : null,
      gridImageLibrary: gridImageLibrary.map(serializeGridLibEntry).filter((x) => x != null),
      gridImageSprites: gridImageSprites.map((s) => {
        const o = { i: s.i, x: s.x, y: s.y, w: s.w, h: s.h };
        if (s.bindCarryOption != null) o.bindCarryOption = s.bindCarryOption;
        return o;
      }),
      gridImageCells: deriveGridImageCellsFromSprites(),
    };
    if (backgroundImage) body.backgroundImage = backgroundImage;
    const ebsSave = readEditorBgScrollConfigForSave();
    if (ebsSave) body.editorBgScroll = ebsSave;
    body.lanes = gameType === 'frogger' ? lanes : [];
    sanitizeGauntletPlayerSpawns();
    body.gauntletPlayerSpawns = gameType === 'gauntlet'
      ? gauntletPlayerSpawns.map((s) => ({ x: s.x, y: s.y }))
      : [];
    if (gameType === 'gauntlet') {
      sanitizeGauntletLaserRowsInEditor();
      if (gauntletLaserRowStart != null && gauntletLaserRowEnd != null) {
        body.gauntletLaserRowStart = gauntletLaserRowStart;
        body.gauntletLaserRowEnd = gauntletLaserRowEnd;
      } else {
        body.gauntletLaserRowStart = null;
        body.gauntletLaserRowEnd = null;
      }
    }
    const url = mapId ? BASE + '/api/maps/' + mapId : BASE + '/api/maps';
    const method = mapId ? 'PUT' : 'POST';
    fetch(url, { method, headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) })
      .then(r => r.json())
      .then(data => {
        if (data.ok) {
          const id = data.mapId || mapId;
          statusEl.textContent = 'บันทึกแล้ว รหัสฉาก: ' + id + (showMapInGame ? '' : ' (ซ่อนกริดในเกม — รูปบนกริดยังแสดง) — ออกจากห้องแล้วเข้าใหม่ หรือกด F5 ในหน้าเล่น ถึงจะเห็นผล');
          if (gameType === 'quiz_carry' && gridImageSprites.length) {
            const used = new Set();
            gridImageSprites.forEach(function (s) {
              if (s && Number.isFinite(s.i) && s.i >= 0) used.add(Math.floor(s.i));
            });
            const noHeld = [];
            used.forEach(function (idx) {
              const e = gridImageLibrary[idx];
              if (!gridLibHeldUrl(e)) noHeld.push(idx);
            });
            if (noHeld.length) {
              const labels = noHeld.sort(function (a, b) { return a - b; }).map(function (i) { return '#' + (i + 1); });
              statusEl.textContent += ' — เตือน (หยิบมาวาง): คลัง ' + labels.join(', ') + ' ยังไม่มีรูป «หยิบแล้ว» — ในเกมรูปบนพื้น/มือจะไม่สลับ (อัปโหลดช่องที่สองในคลัง หรือให้ held ต่างจาก idle)';
            }
          }
          if (!mapId) window.history.replaceState({}, '', 'editor.html' + buildEditorSearch(id));
        } else statusEl.textContent = data.error || 'บันทึกไม่ได้';
      })
      .catch(() => { statusEl.textContent = 'บันทึกไม่ได้'; });
  });

  const cellColorWrap = document.getElementById('cell-color-wrap');
  const gridImageToolsWrap = document.getElementById('editor-grid-image-tools');
  const cellAlphaEl = document.getElementById('cell-alpha');
  const cellAlphaValue = document.getElementById('cell-alpha-value');
  function syncDrawModeAuxUi() {
    if (!drawModeEl) return;
    if (cellColorWrap) cellColorWrap.style.display = drawModeEl.value === 'color' ? 'inline' : 'none';
    if (gridImageToolsWrap) gridImageToolsWrap.style.display = drawModeEl.value === 'cellImage' ? 'flex' : 'none';
    const bindWrap = document.getElementById('grid-sprite-carry-bind-wrap');
    if (bindWrap) {
      const gt = gameTypeEl ? gameTypeEl.value : gameType;
      bindWrap.style.display = (drawModeEl.value === 'cellImage' && gt === 'quiz_carry') ? 'flex' : 'none';
    }
  }
  if (drawModeEl) drawModeEl.addEventListener('change', () => { syncDrawModeAuxUi(); syncLobbySpawnAuxUi(); });
  syncDrawModeAuxUi();
  syncLobbySpawnAuxUi();
  const gridCellUpload = document.getElementById('grid-cell-image-upload');
  if (gridCellUpload) {
    gridCellUpload.addEventListener('change', (e) => {
      const file = e.target.files && e.target.files[0];
      if (!file) return;
      if (file.size > 6 * 1024 * 1024) {
        if (statusEl) statusEl.textContent = 'ไฟล์ใหญ่เกิน 6MB — ลดขนาดก่อนอัปโหลด';
        e.target.value = '';
        return;
      }
      const r = new FileReader();
      r.onload = () => {
        const dataUrl = r.result;
        if (typeof dataUrl !== 'string' || !dataUrl.startsWith('data:')) {
          e.target.value = '';
          return;
        }
        gridImageLibrary.push({ idle: dataUrl, held: null });
        gridImageBrushIndex = gridImageLibrary.length - 1;
        delete editorGridImageElByIndex[gridImageBrushIndex];
        primeEditorGridImage(gridImageBrushIndex);
        rebuildGridImageGallery();
        syncGridImageBrushInputCaps();
        draw();
        if (statusEl) statusEl.textContent = 'เพิ่มรูปเข้าคลังแล้ว — คลิกซ้ายบนกริดเพื่อวาง (ตั้งกว้าง×สูงก่อนได้)';
      };
      r.readAsDataURL(file);
      e.target.value = '';
    });
  }
  const gridHeldUpload = document.getElementById('grid-cell-image-held-upload');
  if (gridHeldUpload) {
    gridHeldUpload.addEventListener('change', (e) => {
      const file = e.target.files && e.target.files[0];
      const idx = pendingHeldLibIndex;
      pendingHeldLibIndex = -1;
      e.target.value = '';
      if (!file || idx < 0 || idx >= gridImageLibrary.length) return;
      if (file.size > 6 * 1024 * 1024) {
        if (statusEl) statusEl.textContent = 'ไฟล์ใหญ่เกิน 6MB — ลดขนาดก่อนอัปโหลด';
        return;
      }
      const r = new FileReader();
      r.onload = () => {
        const dataUrl = r.result;
        if (typeof dataUrl !== 'string' || !dataUrl.startsWith('data:')) return;
        const idle = gridLibIdleUrl(gridImageLibrary[idx]);
        if (dataUrl === idle) {
          if (statusEl) statusEl.textContent = 'ไฟล์นี้เหมือนรูปก่อนหยิบทุกไบต์ — เลือกภาพอื่นสำหรับ «หยิบแล้ว» ถึงจะเห็นต่างในเกม';
          rebuildGridImageGallery();
          draw();
          return;
        }
        gridImageLibrary[idx] = { idle, held: dataUrl };
        delete editorGridImageHeldElByIndex[idx];
        rebuildGridImageGallery();
        draw();
        if (statusEl) statusEl.textContent = 'ตั้งรูปตอนถือสำหรับ #' + (idx + 1) + ' แล้ว (quiz carry — แสดงบนแมปจนกว่าจะปล่อย)';
      };
      r.readAsDataURL(file);
    });
  }
  const btnRmGridLib = document.getElementById('btn-grid-image-remove-from-lib');
  if (btnRmGridLib) {
    btnRmGridLib.addEventListener('click', () => {
      if (!gridImageLibrary.length) return;
      removeGridImageFromLibraryAt(gridImageBrushIndex);
    });
  }
  const brushWEl0 = document.getElementById('grid-image-brush-w');
  const brushHEl0 = document.getElementById('grid-image-brush-h');
  if (brushWEl0) brushWEl0.addEventListener('input', () => { syncGridImageBrushInputCaps(); draw(); });
  if (brushHEl0) brushHEl0.addEventListener('input', () => { syncGridImageBrushInputCaps(); draw(); });
  if (cellAlphaEl && cellAlphaValue) cellAlphaEl.addEventListener('input', () => { cellAlphaValue.textContent = cellAlphaEl.value; draw(); });

  mapW.addEventListener('change', resize);
  mapH.addEventListener('change', resize);
  tileSizeEl.addEventListener('change', resize);
  if (characterCellsWEl) characterCellsWEl.addEventListener('input', () => {
    const fp = readCharacterFootprintInputs();
    applyCharacterFootprintInputs(fp.cw, fp.ch);
    draw();
  });
  if (characterCellsHEl) characterCellsHEl.addEventListener('input', () => {
    const fp = readCharacterFootprintInputs();
    applyCharacterFootprintInputs(fp.cw, fp.ch);
    draw();
  });
  if (characterCollisionWEl) characterCollisionWEl.addEventListener('input', () => {
    const fp = readCharacterFootprintInputs();
    applyCharacterFootprintInputs(fp.cw, fp.ch);
    draw();
  });
  if (characterCollisionHEl) characterCollisionHEl.addEventListener('input', () => {
    const fp = readCharacterFootprintInputs();
    applyCharacterFootprintInputs(fp.cw, fp.ch);
    draw();
  });
  function clampSepInput(el) {
    if (!el) return;
    let v = Math.floor(Number(el.value));
    if (!Number.isFinite(v) || v < 0) v = 0;
    el.value = String(Math.min(4, v));
  }
  if (blockPlayerSeparationWEl) {
    blockPlayerSeparationWEl.addEventListener('input', () => {
      clampSepInput(blockPlayerSeparationWEl);
      draw();
    });
  }
  if (blockPlayerSeparationHEl) {
    blockPlayerSeparationHEl.addEventListener('input', () => {
      clampSepInput(blockPlayerSeparationHEl);
      draw();
    });
  }

  if (mapId) {
    fetch(BASE + '/api/maps/' + mapId)
      .then(r => r.json())
      .then(m => {
        width = Math.max(10, Math.min(50, parseInt(m.width, 10) || 20));
        height = Math.max(10, Math.min(40, parseInt(m.height, 10) || 15));
        tileSize = Math.max(16, Math.min(64, parseInt(m.tileSize, 10) || 32));
        const leg = Math.max(1, Math.min(4, m.characterCells || 1));
        let cwL = Number(m.characterCellsW);
        let chL = Number(m.characterCellsH);
        cwL = Number.isFinite(cwL) ? Math.max(1, Math.min(4, Math.floor(cwL))) : leg;
        chL = Number.isFinite(chL) ? Math.max(1, Math.min(4, Math.floor(chL))) : leg;
        applyCharacterFootprintInputs(cwL, chL);
        let colWL = Number(m.characterCollisionW);
        let colHL = Number(m.characterCollisionH);
        colWL = Number.isFinite(colWL) ? Math.max(1, Math.min(cwL, Math.floor(colWL))) : cwL;
        colHL = Number.isFinite(colHL) ? Math.max(1, Math.min(chL, Math.floor(colHL))) : chL;
        if (characterCollisionWEl) characterCollisionWEl.value = String(colWL);
        if (characterCollisionHEl) characterCollisionHEl.value = String(colHL);
        if (blockPlayerSeparationWEl || blockPlayerSeparationHEl) {
          let wS = Math.floor(Number(m.blockPlayerSeparationW));
          let hS = Math.floor(Number(m.blockPlayerSeparationH));
          if (!Number.isFinite(wS) || wS < 0) {
            const leg = Math.floor(Number(m.blockPlayerSeparation));
            wS = Number.isFinite(leg) && leg >= 0 ? Math.min(4, leg) : 0;
          } else wS = Math.min(4, wS);
          if (!Number.isFinite(hS) || hS < 0) {
            const leg = Math.floor(Number(m.blockPlayerSeparation));
            hS = Number.isFinite(leg) && leg >= 0 ? Math.min(4, leg) : 0;
          } else hS = Math.min(4, hS);
          if (blockPlayerSeparationWEl) blockPlayerSeparationWEl.value = String(wS);
          if (blockPlayerSeparationHEl) blockPlayerSeparationHEl.value = String(hS);
        }
        ground = m.ground || [];
        objects = m.objects || [];
        ensureObjectsGroundGrids();
        blockPlayer = m.blockPlayer ? m.blockPlayer.map(r => r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        interactive = m.interactive && m.interactive.length ? m.interactive.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        startGameArea = m.startGameArea && m.startGameArea.length ? m.startGameArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        spawnArea = m.spawnArea && m.spawnArea.length ? m.spawnArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        quizTrueArea = m.quizTrueArea && m.quizTrueArea.length ? m.quizTrueArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        quizFalseArea = m.quizFalseArea && m.quizFalseArea.length ? m.quizFalseArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        quizQuestionArea = m.quizQuestionArea && m.quizQuestionArea.length ? m.quizQuestionArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        quizCarryHubArea = m.quizCarryHubArea && m.quizCarryHubArea.length ? m.quizCarryHubArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        quizCarryOptionArea = m.quizCarryOptionArea && m.quizCarryOptionArea.length ? m.quizCarryOptionArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        carryEmbedCountdownArea = m.carryEmbedCountdownArea && m.carryEmbedCountdownArea.length
          ? m.carryEmbedCountdownArea.map(r => r && r.slice())
          : Array(height).fill(0).map(() => Array(width).fill(0));
        quizBattleDomeArea = m.quizBattleDomeArea && m.quizBattleDomeArea.length ? m.quizBattleDomeArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        quizBattlePathArea = m.quizBattlePathArea && m.quizBattlePathArea.length ? m.quizBattlePathArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        jumpSurvivePlatforms = Array.isArray(m.jumpSurvivePlatforms) ? m.jumpSurvivePlatforms.map((p) => (p && typeof p === 'object' ? { ...p } : null)).filter(Boolean) : [];
        jumpSurvivePlatformArea = m.jumpSurvivePlatformArea && m.jumpSurvivePlatformArea.length ? m.jumpSurvivePlatformArea.map((r) => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        ensureJumpSurvivePlatformArea();
        shooterSpawnSlots = m.shooterSpawnSlots && m.shooterSpawnSlots.length
          ? m.shooterSpawnSlots.map((r) => r && r.slice())
          : Array(height).fill(0).map(() => Array(width).fill(0));
        ensureShooterSpawnSlots();
        balloonBossPlayerSlots = m.balloonBossPlayerSlots && m.balloonBossPlayerSlots.length
          ? m.balloonBossPlayerSlots.map((r) => r && r.slice())
          : Array(height).fill(0).map(() => Array(width).fill(0));
        ensureBalloonBossPlayerSlots();
        if (m.balloonBossBossSpawn && Number.isFinite(Number(m.balloonBossBossSpawn.x)) && Number.isFinite(Number(m.balloonBossBossSpawn.y))) {
          balloonBossBossSpawn = { x: Math.floor(Number(m.balloonBossBossSpawn.x)), y: Math.floor(Number(m.balloonBossBossSpawn.y)) };
        } else {
          balloonBossBossSpawn = null;
        }
        stackReleaseArea = m.stackReleaseArea && m.stackReleaseArea.length ? m.stackReleaseArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        stackLandArea = m.stackLandArea && m.stackLandArea.length ? m.stackLandArea.map(r => r && r.slice()) : Array(height).fill(0).map(() => Array(width).fill(0));
        cellColors = (m.cellColors && m.cellColors.length === height) ? m.cellColors.map(r => r && r.slice ? r.slice() : Array(width).fill(null)) : Array(height).fill(0).map(() => Array(width).fill(null));
        gridImageLibrary = Array.isArray(m.gridImageLibrary)
          ? m.gridImageLibrary.map(normalizeGridLibEntry).filter((e) => e && gridLibIdleUrl(e) && gridLibIdleUrl(e).length < 25000000)
          : [];
        gridImageSprites = migrateSpritesFromMapJson(m, width, height);
        sanitizeSpritesInPlace();
        gridImageBrushIndex = Math.min(gridImageBrushIndex, Math.max(0, gridImageLibrary.length - 1));
        Object.keys(editorGridImageElByIndex).forEach((k) => { delete editorGridImageElByIndex[k]; });
        Object.keys(editorGridImageHeldElByIndex).forEach((k) => { delete editorGridImageHeldElByIndex[k]; });
        rebuildGridImageGallery();
        syncGridImageBrushInputCaps();
        showMapInGame = m.showMapInGame !== false;
        const showMapEl = document.getElementById('show-map-in-game');
        if (showMapEl) showMapEl.checked = showMapInGame;
        const cdH = document.getElementById('carry-embed-countdown-highlight');
        if (cdH) cdH.checked = m.carryEmbedCountdownHighlight !== false;
        const cdC = document.getElementById('carry-embed-countdown-color');
        if (cdC && typeof m.carryEmbedCountdownHighlightColor === 'string') {
          const hx = m.carryEmbedCountdownHighlightColor.trim();
          if (/^#[0-9a-fA-F]{6}$/.test(hx)) cdC.value = hx;
        }
        const cdA = document.getElementById('carry-embed-countdown-anchor');
        if (cdA) {
          const a = m.carryEmbedCountdownAnchor;
          cdA.value = (a === 'grid' || a === 'screen' || a === 'map') ? a : 'map';
        }
        ensureInteractive();
        ensureStartGameArea();
        ensureSpawnArea();
        backgroundImage = m.backgroundImage || null;
        if (backgroundImage) {
          backgroundImageImg = new Image();
          backgroundImageImg.onload = () => { draw(); };
          backgroundImageImg.src = backgroundImage;
        } else backgroundImageImg = null;
        applyEditorBgScrollFromMap(m);
        spawn = m.spawn || { x: 1, y: 1 };
        gauntletPlayerSpawns = Array.isArray(m.gauntletPlayerSpawns)
          ? m.gauntletPlayerSpawns.map((s) => ({ x: Math.floor(Number(s.x)), y: Math.floor(Number(s.y)) }))
            .filter((s) => Number.isFinite(s.x) && Number.isFinite(s.y))
          : [];
        const rs = m.gauntletLaserRowStart;
        const re = m.gauntletLaserRowEnd;
        if (rs != null && re != null && Number.isFinite(Number(rs)) && Number.isFinite(Number(re))) {
          gauntletLaserRowStart = Math.floor(Number(rs));
          gauntletLaserRowEnd = Math.floor(Number(re));
          sanitizeGauntletLaserRowsInEditor();
        } else {
          gauntletLaserRowStart = null;
          gauntletLaserRowEnd = null;
        }
        lobbyPlayerSpawns = [null, null, null, null, null, null];
        if (Array.isArray(m.lobbyPlayerSpawns)) {
          for (let li = 0; li < 6 && li < m.lobbyPlayerSpawns.length; li++) {
            const c = m.lobbyPlayerSpawns[li];
            if (c && c.x != null && c.y != null) {
              lobbyPlayerSpawns[li] = { x: Math.floor(Number(c.x)), y: Math.floor(Number(c.y)) };
            }
          }
        }
        sanitizeLobbyPlayerSpawnsInEditor();
        const lsmLoad = document.getElementById('lobby-spawn-mode');
        if (lsmLoad) {
          const mv = m.lobbySpawnMode;
          lsmLoad.value = (mv === 'fixed' || mv === 'slots6') ? mv : 'random';
        }
        gameType = m.gameType || 'zep';
        if (gameTypeEl) gameTypeEl.value = gameType;
        lanes = (m.lanes && m.lanes.length) ? m.lanes.map(l => ({ ...l })) : [];
        if (gameType === 'gauntlet' || gameType === 'stack' || gameType === 'quiz_carry' || gameType === 'quiz_battle' || gameType === 'jump_survive' || gameType === 'space_shooter' || gameType === 'balloon_boss') lanes = [];
        if (gameType === 'frogger') {
          ensureLanes();
          if (lanes.length !== height) ensureLanes();
        }
        mapName.value = m.name || ''; mapW.value = width; mapH.value = height; tileSizeEl.value = tileSize;
        sanitizeGauntletPlayerSpawns();
        resize(); draw();
        toggleFroggerUI();
      })
      .catch(() => initGrid());
  } else { initGrid(); toggleFroggerUI(); }
})();