(function (root) {
  "use strict";

  const TOKEN_KEY = "maze32.session.v1";
  const MAX_VIEW_CHUNKS = 90;
  const MAX_VIEW_WIDTH = 32;
  const MAX_VIEW_HEIGHT = 32;
  const MAX_VIEW_CELLS = 1024;
  const MAX_VIEW_OBJECTS = 12;
  const OBSERVER_CELL_SIZE = 8;
  const JOYSTICK_DEAD_ZONE = 20;
  const JOYSTICK_HYSTERESIS = .18;
  const JOYSTICK_SLOW_REPEAT_MS = 360;
  const JOYSTICK_FAST_REPEAT_MS = 170;
  const ONBOARDING_STEPS = Object.freeze([
    Object.freeze({icon: "hand", title: "Потяни кружок", text: "Кружок ведёт героя по лабиринту."}),
    Object.freeze({icon: "motion", title: "Отпусти — герой ждёт", text: "Рука остановилась — шаги тоже."}),
    Object.freeze({icon: "maze", title: "Стена не пускает", text: "Упрись в стену — попробуй другую сторону."}),
    Object.freeze({icon: "key", title: "Найди ключ", text: "Ключ открывает твой выход."}),
    Object.freeze({icon: "eye", title: "Глаз расширяет карту", text: "Возьми глаз — увидишь дальше."}),
    Object.freeze({icon: "arrow", title: "Стрелка знает путь", text: "Компас показывает сторону выхода."}),
    Object.freeze({icon: "exit", title: "Выходи с ключом", text: "Коснись своего выхода с ключом."}),
    Object.freeze({icon: "friends", title: "Встретил друга", text: "Другой герой может отдать найденный ключ."})
  ]);
  const NAME_ADJECTIVES = Object.freeze(["Бодрый", "Хитрый", "Тихий", "Смелый", "Ловкий", "Сонный", "Шустрый", "Лунный", "Яркий", "Дикий", "Вечный", "Храбрый"]);
  const NAME_NOUNS = Object.freeze(["Барсук", "Крот", "Енот", "Кабан", "Кактус", "Жук", "Тостер", "Тюлень", "Гриб", "Ежик", "Бублик", "Пингвин"]);
  const NAME_COMBINATION_COUNT = NAME_ADJECTIVES.length * NAME_NOUNS.length;
  const LOGIN_HEADLINES = Object.freeze([
    Object.freeze({first: "Кусты уже", highlight: "потеряли выход"}),
    Object.freeze({first: "Лабиринт снова", highlight: "подстригли криво"}),
    Object.freeze({first: "Пиксели дружно", highlight: "ушли в кусты"}),
    Object.freeze({first: "Карта молчит", highlight: "но смотрит косо"}),
    Object.freeze({first: "Выход рядом", highlight: "в другой вселенной"}),
    Object.freeze({first: "Крот сказал", highlight: "что это срез"}),
    Object.freeze({first: "Тупик машет", highlight: "обеими стенами"}),
    Object.freeze({first: "Компас уверен", highlight: "почти наверняка"})
  ]);
  const KEY_DIRECTIONS = Object.freeze({
    ArrowUp: "north", KeyW: "north",
    ArrowRight: "east", KeyD: "east",
    ArrowDown: "south", KeyS: "south",
    ArrowLeft: "west", KeyA: "west"
  });
  const HINTS = Object.freeze({none: "Молчит", n: "Север", ne: "Северо-восток", e: "Восток", se: "Юго-восток", s: "Юг", sw: "Юго-запад", w: "Запад", nw: "Северо-запад"});
  const HINT_ANGLES = Object.freeze({none: 0, n: 0, ne: 45, e: 90, se: 135, s: 180, sw: 225, w: 270, nw: 315});
  const PHASES = Object.freeze({countdown: "Обратный отсчёт", waiting: "Ждём игроков", active: "Гонка идёт", finish_pending: "Фотофиниш", paused: "Пауза", finished: "Финиш"});
  const ERRORS = Object.freeze({invalid_name: "Позывной должен быть длиной от 1 до 32 символов без пробелов по краям.", duplicate_name: "Этот позывной уже занят. Клоны сегодня не участвуют.", role_full: "Свободных мест больше нет.", invalid_token: "Старая сессия не найдена. Выбираем новый позывной.", session_connected: "Эта сессия уже открыта в другом окне.", not_owner: "Запустить гонку может только Игрок 1.", not_ready: "Для старта нужны оба игрока онлайн.", invalid_phase: "Сейчас эту команду выполнять нельзя.", rate_limited: "Слишком быстро! Сервер просит немного меньше турбо.", blocked: "Там стена. Очень убедительная.", no_key: "Карман пуст — бросать нечего.", player_exited: "Герой уже снаружи. Возвращаться за тапочками поздно.", match_finished: "Гонка уже закончилась.", stale_sequence: "Команда устарела и отправилась в музей.", unauthorized: "Сначала выберите роль или восстановите сессию.", text_required: "Сервер принимает только текстовые команды.", protocol_error: "Пакет не прошёл проверку протокола.", request_rejected: "Сервер отклонил команду.", no_suggestion: "Все смешные имена уже разобрали."});

  function randomIndex(limit, randomSource) {
    if (!Number.isInteger(limit) || limit < 1) return 0;
    if (typeof randomSource === "function") {
      const value = randomSource(limit);
      return Number.isInteger(value) && value >= 0 && value < limit ? value : 0;
    }
    if (root.crypto && typeof root.crypto.getRandomValues === "function") {
      const maximum = Math.floor(0x100000000 / limit) * limit;
      const values = new Uint32Array(1);
      for (let attempt = 0; attempt < 4; attempt++) {
        root.crypto.getRandomValues(values);
        if (values[0] < maximum) return values[0] % limit;
      }
      return values[0] % limit;
    }
    return Math.floor(Math.random() * limit);
  }

  function randomSuggestedName(occupiedNames, randomSource) {
    const occupied = new Set(Array.isArray(occupiedNames) ? occupiedNames : []);
    for (let attempt = 0; attempt < NAME_COMBINATION_COUNT; attempt++) {
      const adjective = NAME_ADJECTIVES[randomIndex(NAME_ADJECTIVES.length, randomSource)];
      const noun = NAME_NOUNS[randomIndex(NAME_NOUNS.length, randomSource)];
      const name = `${adjective}-${noun}`;
      if (!occupied.has(name)) return name;
    }
    for (let combination = 0; combination < NAME_COMBINATION_COUNT; combination++) {
      const adjective = NAME_ADJECTIVES[Math.floor(combination / NAME_NOUNS.length)];
      const noun = NAME_NOUNS[combination % NAME_NOUNS.length];
      const name = `${adjective}-${noun}`;
      if (!occupied.has(name)) return name;
    }
    return null;
  }

  function randomLoginHeadline(randomSource) {
    return LOGIN_HEADLINES[randomIndex(LOGIN_HEADLINES.length, randomSource)];
  }

  function directionFromKey(code) {
    return KEY_DIRECTIONS[code] || null;
  }

  function directionFromSwipe(startX, startY, endX, endY, minimumDistance) {
    const dx = endX - startX;
    const dy = endY - startY;
    const threshold = minimumDistance == null ? 28 : minimumDistance;
    if (Math.max(Math.abs(dx), Math.abs(dy)) < threshold) {
      return null;
    }
    if (Math.abs(dx) > Math.abs(dy)) {
      return dx > 0 ? "east" : "west";
    }
    return dy > 0 ? "south" : "north";
  }

  function clamp(value, minimum, maximum) {
    return Math.min(maximum, Math.max(minimum, value));
  }

  function joystickDirection(dx, dy, previousDirection) {
    const horizontal = Math.abs(dx);
    const vertical = Math.abs(dy);
    if (Math.max(horizontal, vertical) < JOYSTICK_DEAD_ZONE) return null;
    const previousWasHorizontal = previousDirection === "east" || previousDirection === "west";
    const previousWasVertical = previousDirection === "north" || previousDirection === "south";
    if (previousWasHorizontal && horizontal >= vertical * (1 - JOYSTICK_HYSTERESIS)) return dx >= 0 ? "east" : "west";
    if (previousWasVertical && vertical >= horizontal * (1 - JOYSTICK_HYSTERESIS)) return dy >= 0 ? "south" : "north";
    return horizontal >= vertical ? (dx >= 0 ? "east" : "west") : (dy >= 0 ? "south" : "north");
  }

  function joystickRepeatMs(distance, radius) {
    if (!Number.isFinite(distance) || !Number.isFinite(radius) || distance <= JOYSTICK_DEAD_ZONE || radius <= JOYSTICK_DEAD_ZONE) return null;
    const strength = clamp((distance - JOYSTICK_DEAD_ZONE) / (radius - JOYSTICK_DEAD_ZONE), 0, 1);
    return Math.round(JOYSTICK_SLOW_REPEAT_MS - (JOYSTICK_SLOW_REPEAT_MS - JOYSTICK_FAST_REPEAT_MS) * strength);
  }

  function joystickVector(dx, dy, radius, previousDirection) {
    const distance = Math.hypot(dx, dy);
    const boundedDistance = Math.min(distance, radius);
    const ratio = distance > 0 ? boundedDistance / distance : 0;
    return {
      x: dx * ratio,
      y: dy * ratio,
      distance: boundedDistance,
      direction: joystickDirection(dx, dy, previousDirection),
      repeatMs: joystickRepeatMs(boundedDistance, radius)
    };
  }

  function playerCellSize(stageWidth, stageHeight, columns, rows) {
    if (![stageWidth, stageHeight, columns, rows].every(value => Number.isFinite(value) && value > 0)) return 46;
    return Math.round(clamp(Math.min(stageWidth / (columns + 1), stageHeight / (rows + 1)), 32, 72));
  }

  function nextOnboardingStep(currentStep) {
    return currentStep >= ONBOARDING_STEPS.length - 1 ? null : currentStep + 1;
  }

  function createEnvelope(type, sequence, requestId, payload) {
    return {v: 1, type, seq: sequence, requestId, payload: payload || {}};
  }

  function snapshotIsValid(snapshot) {
    if (!Number.isInteger(snapshot.width) || snapshot.width < 1 || snapshot.width > MAX_VIEW_WIDTH || !Number.isInteger(snapshot.height) || snapshot.height < 1 || snapshot.height > MAX_VIEW_HEIGHT || snapshot.width * snapshot.height > MAX_VIEW_CELLS) {
      return false;
    }
    const cellLimit = snapshot.width * snapshot.height;
    return snapshot.cells.every(cell => Array.isArray(cell) && cell.length === 2 && Number.isInteger(cell[0]) && cell[0] >= 0 && cell[0] < cellLimit && Number.isInteger(cell[1]) && cell[1] >= 0 && cell[1] <= 15) && snapshot.objects.every(object => Array.isArray(object) && object.length === 4 && Number.isInteger(object[3]) && object[3] >= 0 && object[3] < cellLimit);
  }

  class SnapshotAssembler {
    constructor() {
      this.pending = null;
    }

    accept(message) {
      if (!message || message.v !== 1 || message.type !== "view" || !Number.isInteger(message.seq)) {
        return null;
      }
      const payload = message.payload;
      if (!payload || !Number.isInteger(payload.chunk) || !Number.isInteger(payload.chunks) || payload.chunks < 1 || payload.chunks > MAX_VIEW_CHUNKS || payload.chunk < 0 || payload.chunk >= payload.chunks || !Array.isArray(payload.cells) || payload.cells.length > 12 || !Array.isArray(payload.objects) || payload.objects.length > 6) {
        return null;
      }
      if (!this.pending || this.pending.seq !== message.seq || this.pending.count !== payload.chunks) {
        this.pending = {seq: message.seq, count: payload.chunks, parts: new Array(payload.chunks)};
      }
      this.pending.parts[payload.chunk] = payload;
      if (this.pending.parts.filter(Boolean).length !== this.pending.count) {
        return null;
      }
      const first = this.pending.parts[0];
      const snapshot = Object.assign({}, first, {
        cells: this.pending.parts.flatMap(part => part.cells),
        objects: this.pending.parts.flatMap(part => part.objects)
      });
      if (snapshot.cells.length > MAX_VIEW_CELLS || snapshot.objects.length > MAX_VIEW_OBJECTS || !snapshotIsValid(snapshot)) {
        this.pending = null;
        return null;
      }
      delete snapshot.chunk;
      delete snapshot.chunks;
      this.pending = null;
      return snapshot;
    }
  }

  function projectedCellIndices(snapshot) {
    return snapshot && Array.isArray(snapshot.cells) ? snapshot.cells.map(cell => cell[0]) : [];
  }

  function clampObserverZoom(value) {
    return Math.min(6, Math.max(.25, value));
  }

  function observerFitScale(stageWidth, stageHeight, columns, rows) {
    if (![stageWidth, stageHeight, columns, rows].every(value => Number.isFinite(value) && value > 0)) return 1;
    return clampObserverZoom(Math.min(stageWidth / (columns * OBSERVER_CELL_SIZE), stageHeight / (rows * OBSERVER_CELL_SIZE)) * .96);
  }

  function boot(documentObject, windowObject) {
    const byId = id => documentObject.getElementById(id);
    const state = {socket: null, clientSequence: 0, serverSequence: 0, viewSequence: -1, session: null, lobby: null, snapshot: null, reconnectTimer: null, noticeTimer: null, touchStart: null, pending: new Map(), assembler: new SnapshotAssembler(), audio: null, feedbackReady: false, muted: false, reducedMotion: false, onboardingSeen: false, onboardingStep: 0, joystick: {pointerId: null, direction: null, repeatTimer: null, repeatMs: null}, observer: {scale: 1, x: 0, y: 0, dragging: null}};

    function showNotice(text, kind) {
      const element = byId("notice");
      element.textContent = text;
      element.className = `notice visible ${kind || ""}`;
      windowObject.clearTimeout(state.noticeTimer);
      state.noticeTimer = windowObject.setTimeout(() => element.classList.remove("visible"), 2600);
    }

    function setScreen(name) {
      byId("welcome-screen").hidden = name !== "welcome";
      byId("lobby-screen").hidden = name !== "lobby";
      byId("match-screen").hidden = name !== "match";
      byId("observer-screen").hidden = name !== "observer";
    }

    function renderWelcomeHeadline(headline) {
      const title = byId("welcome-title");
      const highlight = documentObject.createElement("span");
      highlight.textContent = headline.highlight;
      title.replaceChildren(documentObject.createTextNode(headline.first), documentObject.createElement("br"), highlight);
    }

    function setConnection(connectionState, text) {
      byId("connection").dataset.state = connectionState;
      byId("connection-text").textContent = text;
      byId("details-text").textContent = connectionState === "online" ? "WebSocket подключён к локальному ESP." : "Команды временно не отправляются. Повторяем подключение автоматически.";
      if (connectionState !== "online") resetJoystick();
    }

    renderWelcomeHeadline(randomLoginHeadline());

    function beginFeedback() {
      if (state.feedbackReady) return;
      state.feedbackReady = true;
      const AudioContext = windowObject.AudioContext || windowObject.webkitAudioContext;
      if (AudioContext) {
        try { state.audio = new AudioContext(); } catch (_) { state.audio = null; }
      }
    }

    function feedback(success) {
      if (state.muted) return;
      if (windowObject.navigator && typeof windowObject.navigator.vibrate === "function") {
        windowObject.navigator.vibrate(success ? 18 : [24, 35, 24]);
      }
      if (!state.audio || state.audio.state === "suspended") return;
      const oscillator = state.audio.createOscillator();
      const gain = state.audio.createGain();
      oscillator.frequency.value = success ? 560 : 150;
      oscillator.type = "square";
      gain.gain.setValueAtTime(.035, state.audio.currentTime);
      gain.gain.exponentialRampToValueAtTime(.001, state.audio.currentTime + .06);
      oscillator.connect(gain).connect(state.audio.destination);
      oscillator.start(); oscillator.stop(state.audio.currentTime + .065);
    }

    function setPending(requestId, element) {
      if (!requestId || !element) return;
      state.pending.set(requestId, element);
      element.classList.add("pending");
    }

    function clearPending(requestId) {
      const element = state.pending.get(requestId);
      if (element) element.classList.remove("pending");
      state.pending.delete(requestId);
    }

    function send(type, payload, element) {
      if (!state.socket || state.socket.readyState !== windowObject.WebSocket.OPEN) {
        showNotice("Нет связи с ESP. Команда осталась дома.", "error");
        return null;
      }
      const sequence = ++state.clientSequence;
      const requestId = `${type}-${sequence}`;
      state.socket.send(JSON.stringify(createEnvelope(type, sequence, requestId, payload)));
      setPending(requestId, element);
      return requestId;
    }

    function playerName() {
      if (!state.session || !state.lobby || state.session.role !== "player") return "Неизвестный герой";
      const player = state.lobby.players.find(item => item.slot === state.session.slot);
      return player && player.name ? player.name : `Игрок ${state.session.slot}`;
    }

    function renderLobby() {
      if (!state.lobby) return;
      state.lobby.players.forEach(player => {
        const card = byId(`player-${player.slot}`);
        card.querySelector(".player-name").textContent = player.occupied ? player.name : "Свободно";
        card.querySelector(".player-state").textContent = player.connected ? "На связи" : player.occupied ? "Отошёл искать Wi‑Fi" : "Слот грустит";
        card.classList.toggle("online", !!player.connected);
      });
      byId("observer-count").textContent = state.lobby.observers;
      byId("lobby-phase").textContent = PHASES[state.lobby.phase] || "Сервер размышляет";
      const owner = state.session && state.session.role === "player" && state.session.slot === 1;
      byId("start-match").disabled = !(owner && state.lobby.ready && state.lobby.phase === "waiting");
      byId("launch-help").textContent = owner ? (state.lobby.ready ? "Оба героя здесь. Можно будить лабиринт." : "Ждём второго героя. Первый пока разминает стрелки.") : "Старт доступен Игроку 1, когда оба слота на месте.";
      if (state.session && state.lobby.phase !== "active") setScreen("lobby");
    }

    function icon(name, className) {
      const svg = documentObject.createElementNS("http://www.w3.org/2000/svg", "svg");
      const use = documentObject.createElementNS("http://www.w3.org/2000/svg", "use");
      use.setAttribute("href", `/icons.svg#${name}`);
      svg.appendChild(use);
      const wrapper = documentObject.createElement("span");
      wrapper.className = className;
      wrapper.appendChild(svg);
      return wrapper;
    }

    function addObject(cell, object) {
      const [kind, owner, variant] = object;
      let marker;
      if (kind === "key") {
        marker = icon("key", "object object-key"); marker.dataset.owner = owner === 1 ? "two" : "one";
      } else if (kind === "exit") {
        marker = documentObject.createElement("span"); marker.className = "object object-exit"; marker.dataset.owner = owner === 1 ? "two" : "one"; marker.dataset.open = String(variant);
      } else if (kind === "compass") {
        marker = icon("arrow", "object object-compass");
      } else if (kind === "vision") {
        marker = icon("eye", "object object-vision");
      } else {
        marker = documentObject.createElement("span"); marker.className = "object object-landmark"; marker.textContent = ["♣", "✿", "♠", "⌂"][variant % 4] || "♣";
      }
      cell.appendChild(marker);
    }

    function addPawn(cell, label, opponent) {
      const pawn = documentObject.createElement("span");
      pawn.className = opponent ? "pawn pawn-opponent" : "pawn pawn-self";
      const text = documentObject.createElement("span"); text.textContent = label;
      pawn.appendChild(text); cell.appendChild(pawn);
    }

    function characterForSlot(slot) {
      return slot === 2 ? {symbol: "◆", name: "Мышонок"} : {symbol: "●", name: "Лисёнок"};
    }

    function renderMap(snapshot) {
      const maze = byId("maze");
      maze.replaceChildren();
      if (!Number.isInteger(snapshot.width) || snapshot.width < 1 || !Number.isInteger(snapshot.height) || snapshot.height < 1 || !snapshot.cells.length) {
        byId("map-placeholder").hidden = false;
        return;
      }
      const coordinates = snapshot.cells.map(cell => ({index: cell[0], x: cell[0] % snapshot.width, y: Math.floor(cell[0] / snapshot.width), passages: cell[1]}));
      const minX = Math.min(...coordinates.map(cell => cell.x)); const maxX = Math.max(...coordinates.map(cell => cell.x));
      const minY = Math.min(...coordinates.map(cell => cell.y)); const maxY = Math.max(...coordinates.map(cell => cell.y));
      const columns = maxX - minX + 1;
      const rows = maxY - minY + 1;
      const mapShell = byId("map-shell");
      maze.style.setProperty("--cell", `${playerCellSize(mapShell.clientWidth, mapShell.clientHeight, columns, rows)}px`);
      maze.style.gridTemplateColumns = `repeat(${columns}, var(--cell))`;
      maze.style.gridTemplateRows = `repeat(${rows}, var(--cell))`;
      const objects = new Map();
      snapshot.objects.forEach(object => { const list = objects.get(object[3]) || []; list.push(object); objects.set(object[3], list); });
      coordinates.forEach(data => {
        const cell = documentObject.createElement("span");
        cell.className = "cell";
        cell.style.gridColumn = String(data.x - minX + 1); cell.style.gridRow = String(data.y - minY + 1);
        if (!(data.passages & 1)) cell.classList.add("wall-n");
        if (!(data.passages & 2)) cell.classList.add("wall-e");
        if (!(data.passages & 4)) cell.classList.add("wall-s");
        if (!(data.passages & 8)) cell.classList.add("wall-w");
        (objects.get(data.index) || []).forEach(object => addObject(cell, object));
        const slot = state.session ? state.session.slot : 1;
        if (data.index === snapshot.self) addPawn(cell, characterForSlot(slot).symbol, false);
        if (data.index === snapshot.opponent) addPawn(cell, characterForSlot(slot === 1 ? 2 : 1).symbol, true);
        maze.appendChild(cell);
      });
      byId("map-placeholder").hidden = true;
    }

    function renderSnapshot(snapshot) {
      if (snapshot.role === "observer") {
        renderObserverSnapshot(snapshot);
        return;
      }
      state.snapshot = snapshot;
      setScreen("match");
      const slot = state.session && state.session.slot ? state.session.slot : 1;
      const character = characterForSlot(slot);
      byId("self-slot").textContent = character.symbol;
      byId("self-slot").setAttribute("aria-label", character.name);
      byId("self-name").textContent = playerName();
      byId("identity").className = `identity player-${slot === 1 ? "one" : "two"}`;
      byId("match-screen").classList.toggle("player-two-mode", slot === 2);
      byId("match-state").textContent = PHASES[snapshot.phase] || "Гонка идёт";
      byId("inventory").textContent = snapshot.inventory == null ? "Пусто" : `Ключ ${characterForSlot(snapshot.inventory + 1).symbol}`;
      byId("inventory-stat").dataset.filled = String(snapshot.inventory != null);
      byId("drop-key").disabled = snapshot.inventory == null;
      byId("vision").textContent = snapshot.visionMoves ? `${snapshot.visionMoves} ход.` : "Нет";
      byId("vision-stat").classList.toggle("vision-active", snapshot.visionMoves > 0);
      const hint = HINTS[snapshot.hint] ? snapshot.hint : "none";
      byId("compass").textContent = HINTS[hint];
      byId("compass-stat").dataset.direction = hint;
      byId("compass-arrow").style.transform = `rotate(${HINT_ANGLES[hint]}deg)`;
      renderMap(snapshot);
      if (snapshot.phase === "paused") { resetJoystick(); showModal("Пауза", "Один герой потерялся между Wi‑Fi пакетами. Ждём возвращения.", "ПЕРЕРЫВ", false); }
      else if (snapshot.phase === "finished" || snapshot.result && snapshot.result !== "none") renderResult(snapshot.result);
      else {
        hideModal();
        if (!state.onboardingSeen) showOnboarding(0);
      }
    }

    function applyObserverTransform() {
      const transform = state.observer;
      byId("observer-maze").style.transform = `translate(-50%, -50%) translate(${transform.x}px, ${transform.y}px) scale(${transform.scale})`;
    }

    function resetObserverView(snapshot) {
      const stage = byId("observer-stage");
      state.observer.scale = observerFitScale(stage.clientWidth, stage.clientHeight, snapshot.width, snapshot.height);
      state.observer.x = 0;
      state.observer.y = 0;
      applyObserverTransform();
    }

    function renderObserverSnapshot(snapshot) {
      if (!snapshot.cells.length && state.snapshot && state.snapshot.role === "observer" && state.snapshot.width === snapshot.width && state.snapshot.height === snapshot.height) {
        snapshot.cells = state.snapshot.cells;
      }
      state.snapshot = snapshot;
      setScreen("observer");
      const maze = byId("observer-maze");
      maze.replaceChildren();
      maze.style.gridTemplateColumns = `repeat(${snapshot.width}, ${OBSERVER_CELL_SIZE}px)`;
      maze.style.gridTemplateRows = `repeat(${snapshot.height}, ${OBSERVER_CELL_SIZE}px)`;
      const objects = new Map();
      snapshot.objects.forEach(object => { const list = objects.get(object[3]) || []; list.push(object); objects.set(object[3], list); });
      const players = Array.isArray(snapshot.players) ? snapshot.players : [];
      snapshot.cells.forEach(data => {
        const index = data[0]; const passages = data[1];
        const cell = documentObject.createElement("span");
        cell.className = "cell";
        cell.style.gridColumn = String(index % snapshot.width + 1);
        cell.style.gridRow = String(Math.floor(index / snapshot.width) + 1);
        if (!(passages & 1)) cell.classList.add("wall-n");
        if (!(passages & 2)) cell.classList.add("wall-e");
        if (!(passages & 4)) cell.classList.add("wall-s");
        if (!(passages & 8)) cell.classList.add("wall-w");
        (objects.get(index) || []).forEach(object => addObject(cell, object));
        players.forEach((player, playerIndex) => {
          if (player.cell === index && !player.exited) {
            const pawn = documentObject.createElement("span");
            pawn.className = `pawn pawn-player-${playerIndex === 0 ? "one" : "two"}`;
            const label = documentObject.createElement("span"); label.textContent = `P${playerIndex + 1}`;
            pawn.appendChild(label); cell.appendChild(pawn);
          }
        });
        maze.appendChild(cell);
      });
      players.forEach((player, index) => {
        const key = player.key == null ? "без ключа" : `ключ P${player.key + 1}`;
        byId(`observer-p${index + 1}`).textContent = !player.connected ? "нет связи" : player.exited ? "снаружи" : key;
      });
      byId("observer-phase").textContent = PHASES[snapshot.phase] || "Сервер размышляет";
      const dimensions = `${snapshot.width}x${snapshot.height}`;
      if (!state.observer.initialized || state.observer.dimensions !== dimensions) {
        resetObserverView(snapshot); state.observer.initialized = true; state.observer.dimensions = dimensions;
      } else applyObserverTransform();
      if (snapshot.phase === "finished" || snapshot.result && snapshot.result !== "none") renderResult(snapshot.result);
      else if (snapshot.phase !== "paused") hideModal();
    }

    function showModal(title, text, kicker, countdown) {
      byId("modal-title").textContent = title; byId("modal-text").textContent = text; byId("modal-kicker").textContent = kicker;
      byId("countdown").hidden = !countdown; byId("modal").hidden = false;
    }

    function hideModal() { byId("modal").hidden = true; byId("countdown").hidden = true; }

    function renderOnboardingStep(step) {
      const scene = ONBOARDING_STEPS[step] || ONBOARDING_STEPS[0];
      byId("onboarding-icon-use").setAttribute("href", `/icons.svg#${scene.icon}`);
      byId("onboarding-title").textContent = scene.title;
      byId("onboarding-text").textContent = scene.text;
      documentObject.querySelectorAll("#onboarding-dots span").forEach((dot, index) => dot.classList.toggle("active", index === step));
      byId("onboarding-card").dataset.step = String(step);
      byId("onboarding-next").textContent = step === ONBOARDING_STEPS.length - 1 ? "В лабиринт" : "Дальше";
    }

    function showOnboarding(step) {
      state.onboardingSeen = true;
      state.onboardingStep = clamp(step, 0, ONBOARDING_STEPS.length - 1);
      renderOnboardingStep(state.onboardingStep);
      byId("onboarding").hidden = false;
    }

    function hideOnboarding() { byId("onboarding").hidden = true; }

    function renderResult(result) {
      const slot = state.session && state.session.slot;
      let title = "Ничья!"; let text = "Фотофиниш пожал плечами: оба выбрались почти одновременно.";
      if (result === "player1" || result === "player2") {
        const winner = result === "player1" ? 1 : 2;
        title = slot ? (winner === slot ? "Победа!" : "Победил соперник") : `Победил Игрок ${winner}`;
        text = slot ? (winner === slot ? "Вы официально быстрее очень большого куста." : "Соперник нашёл выход. Лабиринт требует реванш.") : "Зрительный зал фиксирует героический побег без вмешательства в результат.";
      }
      showModal(title, text, "ГОНКА ЗАВЕРШЕНА", false);
      resetJoystick();
      byId("modal-action").textContent = state.session && state.session.role === "player" && state.session.slot === 1 ? "Новая гонка" : "Вернуться в лобби";
      byId("modal-action").hidden = false;
    }

    function showCountdown(payload) {
      showModal("Приготовились!", "Один сервер — один честный момент старта.", "СИНХРОННЫЙ СТАРТ", true);
      const steps = payload && Array.isArray(payload.steps) ? payload.steps : [3, 2, 1];
      let index = 0; byId("countdown").textContent = steps[index];
      const timer = windowObject.setInterval(() => { index++; if (index < steps.length) byId("countdown").textContent = steps[index]; else windowObject.clearInterval(timer); }, 1000);
    }

    function localError(code) { return ERRORS[code] || "Сервер отклонил команду. Подробности остались у него."; }

    function handleMessage(message) {
      if (!message || message.v !== 1 || !Number.isInteger(message.seq)) return;
      if (message.type === "view") {
        if (message.seq < state.viewSequence) return;
        state.viewSequence = Math.max(state.viewSequence, message.seq);
        const snapshot = state.assembler.accept(message);
        if (snapshot) renderSnapshot(snapshot);
        return;
      }
      if (message.seq <= state.serverSequence) return;
      state.serverSequence = message.seq;
      clearPending(message.requestId);
      if (message.type === "session") {
        state.session = message.payload; windowObject.localStorage.setItem(TOKEN_KEY, message.payload.token);
        showNotice(message.payload.role === "player" ? `Слот P${message.payload.slot} закреплён за этим браузером.` : "Вы в зрительном зале. Руками не трогаем!", "success");
        if (state.lobby) renderLobby();
      } else if (message.type === "lobby") { state.lobby = message.payload; renderLobby();
      } else if (message.type === "countdown") { showCountdown(message.payload);
      } else if (message.type === "active") { setScreen(state.session && state.session.role === "observer" ? "observer" : "match"); byId("countdown").textContent = "ВПЕРЁД"; windowObject.setTimeout(hideModal, 750);
      } else if (message.type === "pause") { showModal("Пауза", `Игрок ${message.payload.slot || "?"} переподключается. Ноги пока не считаются.`, "ЖДЁМ СВЯЗЬ", false);
      } else if (message.type === "resume") { hideModal(); showNotice("Оба героя снова на связи. Гонка продолжается.", "success");
      } else if (message.type === "match_result") { renderResult(message.payload.result);
      } else if (message.type === "reset") { state.snapshot = null; state.viewSequence = -1; state.assembler = new SnapshotAssembler(); resetJoystick(); hideModal(); setScreen("lobby"); showNotice("Лабиринт пересажен. Можно начинать новую гонку.", "success");
      } else if (message.type === "ack") { feedback(true);
      } else if (message.type === "error") {
        if (message.payload.code === "invalid_token") { windowObject.localStorage.removeItem(TOKEN_KEY); state.session = null; setScreen("welcome"); }
        if (message.payload.code === "blocked") { const bump = byId("wall-bump"); bump.textContent = localError("blocked"); bump.classList.remove("show"); void bump.offsetWidth; bump.classList.add("show"); }
        showNotice(localError(message.payload.code), "error"); feedback(false);
      }
    }

    function connect() {
      windowObject.clearTimeout(state.reconnectTimer); state.clientSequence = 0; state.serverSequence = 0; state.viewSequence = -1; state.assembler = new SnapshotAssembler();
      const scheme = windowObject.location.protocol === "https:" ? "wss" : "ws";
      state.socket = new windowObject.WebSocket(`${scheme}://${windowObject.location.host}/ws`);
      state.socket.onopen = () => { setConnection("online", "ESP на связи"); const token = windowObject.localStorage.getItem(TOKEN_KEY); if (token) send("restore", {token}, null); };
      state.socket.onmessage = event => { let message; try { message = JSON.parse(event.data); } catch (_) { showNotice("Сервер прислал нечитаемый пакет.", "error"); return; } handleMessage(message); };
      state.socket.onclose = () => { setConnection("offline", "Связь потеряна"); state.reconnectTimer = windowObject.setTimeout(connect, 1000); };
      state.socket.onerror = () => showNotice("WebSocket споткнулся. Пробуем снова…", "error");
    }

    function move(direction, element) {
      if (direction) send("move", {direction}, element || documentObject.querySelector(`[data-direction="${direction}"]`));
    }

    function resetJoystick() {
      windowObject.clearTimeout(state.joystick.repeatTimer);
      state.joystick.pointerId = null;
      state.joystick.direction = null;
      state.joystick.repeatTimer = null;
      state.joystick.repeatMs = null;
      const joystick = byId("joystick");
      const handle = byId("joystick-handle");
      if (joystick) joystick.classList.remove("active");
      if (handle) handle.style.transform = "translate(-50%, -50%)";
    }

    function repeatJoystickMove() {
      const joystick = state.joystick;
      if (!joystick.direction || joystick.pointerId == null || !joystick.repeatMs) return;
      move(joystick.direction, byId("joystick"));
      joystick.repeatTimer = windowObject.setTimeout(repeatJoystickMove, joystick.repeatMs);
    }

    function updateJoystick(event) {
      const joystick = byId("joystick");
      const rect = joystick.getBoundingClientRect();
      const radius = Math.max(1, Math.min(rect.width, rect.height) / 2 - 33);
      const vector = joystickVector(event.clientX - (rect.left + rect.width / 2), event.clientY - (rect.top + rect.height / 2), radius, state.joystick.direction);
      byId("joystick-handle").style.transform = `translate(calc(-50% + ${vector.x}px), calc(-50% + ${vector.y}px))`;
      const directionChanged = vector.direction !== state.joystick.direction;
      state.joystick.direction = vector.direction;
      state.joystick.repeatMs = vector.repeatMs;
      windowObject.clearTimeout(state.joystick.repeatTimer);
      state.joystick.repeatTimer = null;
      if (vector.direction) {
        if (directionChanged) move(vector.direction, joystick);
        state.joystick.repeatTimer = windowObject.setTimeout(repeatJoystickMove, vector.repeatMs);
      }
    }

    function setMuted(muted) {
      state.muted = muted;
      const button = byId("mute-toggle");
      button.setAttribute("aria-pressed", String(muted));
      button.setAttribute("aria-label", muted ? "Включить звук" : "Выключить звук");
      button.title = muted ? "Включить звук" : "Выключить звук";
      button.querySelector("use").setAttribute("href", muted ? "/icons.svg#sound" : "/icons.svg#sound");
    }

    function setReducedMotion(reduced) {
      state.reducedMotion = reduced;
      documentObject.documentElement.dataset.reducedMotion = String(reduced);
      byId("motion-toggle").setAttribute("aria-pressed", String(reduced));
      byId("motion-toggle").setAttribute("aria-label", reduced ? "Включить движение" : "Уменьшить движение");
    }

    documentObject.addEventListener("pointerdown", beginFeedback, {once: true});
    documentObject.addEventListener("keydown", event => {
      if (event.target instanceof windowObject.HTMLInputElement || byId("match-screen").hidden) return;
      beginFeedback();
      const direction = directionFromKey(event.code); if (direction) { event.preventDefault(); move(direction, null); }
    });
    byId("map-shell").addEventListener("touchstart", event => { const touch = event.changedTouches[0]; state.touchStart = {x: touch.clientX, y: touch.clientY}; }, {passive: true});
    byId("map-shell").addEventListener("touchend", event => { if (!state.touchStart) return; const touch = event.changedTouches[0]; move(directionFromSwipe(state.touchStart.x, state.touchStart.y, touch.clientX, touch.clientY), null); state.touchStart = null; }, {passive: true});
    byId("joystick").addEventListener("pointerdown", event => {
      event.preventDefault();
      beginFeedback();
      state.joystick.pointerId = event.pointerId;
      byId("joystick").classList.add("active");
      if (byId("joystick").setPointerCapture) byId("joystick").setPointerCapture(event.pointerId);
      updateJoystick(event);
    });
    byId("joystick").addEventListener("pointermove", event => {
      if (event.pointerId === state.joystick.pointerId) updateJoystick(event);
    });
    const stopJoystick = event => {
      if (event.pointerId === state.joystick.pointerId) resetJoystick();
    };
    byId("joystick").addEventListener("pointerup", stopJoystick);
    byId("joystick").addEventListener("pointercancel", stopJoystick);
    windowObject.addEventListener("blur", resetJoystick);
    documentObject.addEventListener("visibilitychange", () => { if (documentObject.hidden) resetJoystick(); });
    documentObject.querySelectorAll("[data-direction]").forEach(button => button.addEventListener("click", () => move(button.dataset.direction, button)));
    byId("drop-key").addEventListener("click", () => send("drop_key", {}, byId("drop-key")));
    byId("mute-toggle").addEventListener("click", () => setMuted(!state.muted));
    byId("motion-toggle").addEventListener("click", () => setReducedMotion(!state.reducedMotion));
    byId("onboarding-replay").addEventListener("click", () => showOnboarding(0));
    byId("onboarding-next").addEventListener("click", () => {
      const next = nextOnboardingStep(state.onboardingStep);
      if (next == null) hideOnboarding();
      else { state.onboardingStep = next; renderOnboardingStep(next); }
    });
    byId("onboarding-skip").addEventListener("click", hideOnboarding);
    byId("suggest-name").addEventListener("click", () => {
      const occupiedNames = state.lobby && Array.isArray(state.lobby.players) ? state.lobby.players.filter(player => player.occupied && typeof player.name === "string").map(player => player.name) : [];
      const suggestion = randomSuggestedName(occupiedNames);
      if (suggestion) byId("player-name").value = suggestion;
      else showNotice(localError("no_suggestion"), "error");
    });
    byId("join-player").addEventListener("click", () => send("join", {role: "player", name: byId("player-name").value}, byId("join-player")));
    byId("join-observer").addEventListener("click", () => send("join", {role: "observer"}, byId("join-observer")));
    byId("start-match").addEventListener("click", () => send("start", {}, byId("start-match")));
    byId("zoom-in").addEventListener("click", () => { state.observer.scale = clampObserverZoom(state.observer.scale * 1.25); applyObserverTransform(); });
    byId("zoom-out").addEventListener("click", () => { state.observer.scale = clampObserverZoom(state.observer.scale / 1.25); applyObserverTransform(); });
    byId("zoom-reset").addEventListener("click", () => { if (state.snapshot) resetObserverView(state.snapshot); });
    byId("observer-stage").addEventListener("wheel", event => { event.preventDefault(); state.observer.scale = clampObserverZoom(state.observer.scale * (event.deltaY < 0 ? 1.12 : .89)); applyObserverTransform(); }, {passive: false});
    byId("observer-stage").addEventListener("pointerdown", event => { state.observer.dragging = {id: event.pointerId, x: event.clientX, y: event.clientY, originX: state.observer.x, originY: state.observer.y}; byId("observer-stage").classList.add("dragging"); if (byId("observer-stage").setPointerCapture) byId("observer-stage").setPointerCapture(event.pointerId); });
    byId("observer-stage").addEventListener("pointermove", event => { const drag = state.observer.dragging; if (!drag || drag.id !== event.pointerId) return; state.observer.x = drag.originX + event.clientX - drag.x; state.observer.y = drag.originY + event.clientY - drag.y; applyObserverTransform(); });
    const stopObserverDrag = event => { if (state.observer.dragging && state.observer.dragging.id === event.pointerId) { state.observer.dragging = null; byId("observer-stage").classList.remove("dragging"); } };
    byId("observer-stage").addEventListener("pointerup", stopObserverDrag);
    byId("observer-stage").addEventListener("pointercancel", stopObserverDrag);
    byId("details-toggle").addEventListener("click", () => { const panel = byId("details-panel"); panel.hidden = !panel.hidden; byId("details-toggle").setAttribute("aria-expanded", String(!panel.hidden)); });
    byId("modal-action").addEventListener("click", () => {
      if (state.session && state.session.role === "player" && state.session.slot === 1 && state.snapshot && state.snapshot.phase === "finished") {
        send("restart", {}, byId("modal-action"));
      } else {
        hideModal(); setScreen("lobby");
      }
    });
    connect();
    return {state, handleMessage, move, resetJoystick};
  }

  const api = Object.freeze({TOKEN_KEY, MAX_VIEW_CHUNKS, NAME_COMBINATION_COUNT, LOGIN_HEADLINES, ONBOARDING_STEPS, JOYSTICK_DEAD_ZONE, JOYSTICK_HYSTERESIS, JOYSTICK_SLOW_REPEAT_MS, JOYSTICK_FAST_REPEAT_MS, directionFromKey, directionFromSwipe, joystickDirection, joystickRepeatMs, joystickVector, playerCellSize, nextOnboardingStep, randomIndex, randomSuggestedName, randomLoginHeadline, createEnvelope, snapshotIsValid, SnapshotAssembler, projectedCellIndices, clampObserverZoom, observerFitScale, boot});
  if (typeof module !== "undefined" && module.exports) module.exports = api;
  root.Maze32Player = api;
  if (root.document) root.document.addEventListener("DOMContentLoaded", () => { root.maze32PlayerApp = boot(root.document, root); });
})(typeof globalThis !== "undefined" ? globalThis : this);