From b2c91062f195da1ac4e4ed5daaf34c1de2f54924 Mon Sep 17 00:00:00 2001
From: KoyoNoguchi <koo.ooy504405@gmail.com>
Date: Thu, 15 Oct 2026 16:51:15 +0900
Subject: [PATCH] Initial commit: private Texas Hold'em ring game site (lobby +
 table stub)

- 6-digit access key gate with long-lived HttpOnly cookie, brute-force limits
- Lobby with saved player name and live table list
- Table creation (name, starting stack, blinds, blind timer)
- Table play screen stub (seats, button/SB/BB, phase, blinds, timer)
- Security hardening: strict CSP, origin checks, host pinning, input sanitizing

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 .claude/launch.json     |   11 +
 .env.example            |    6 +
 .gitattributes          |    1 +
 .gitignore              |    3 +
 README.md               |  140 +++++
 package-lock.json       | 1083 +++++++++++++++++++++++++++++++++++++++
 package.json            |   18 +
 public/assets/blinds.js |   57 +++
 public/assets/common.js |   99 ++++
 public/assets/create.js |  143 ++++++
 public/assets/key.js    |   82 +++
 public/assets/lobby.js  |   72 +++
 public/assets/style.css |  514 +++++++++++++++++++
 public/assets/table.js  |  187 +++++++
 public/create.html      |   60 +++
 public/key.html         |   33 ++
 public/lobby.html       |   34 ++
 public/table.html       |   81 +++
 server/auth.js          |  214 ++++++++
 server/config.js        |   67 +++
 server/index.js         |  274 ++++++++++
 server/tables.js        |  271 ++++++++++
 22 files changed, 3450 insertions(+)
 create mode 100644 .claude/launch.json
 create mode 100644 .env.example
 create mode 100644 .gitattributes
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 package-lock.json
 create mode 100644 package.json
 create mode 100644 public/assets/blinds.js
 create mode 100644 public/assets/common.js
 create mode 100644 public/assets/create.js
 create mode 100644 public/assets/key.js
 create mode 100644 public/assets/lobby.js
 create mode 100644 public/assets/style.css
 create mode 100644 public/assets/table.js
 create mode 100644 public/create.html
 create mode 100644 public/key.html
 create mode 100644 public/lobby.html
 create mode 100644 public/table.html
 create mode 100644 server/auth.js
 create mode 100644 server/config.js
 create mode 100644 server/index.js
 create mode 100644 server/tables.js

diff --git a/.claude/launch.json b/.claude/launch.json
new file mode 100644
index 0000000..3e641c6
--- /dev/null
+++ b/.claude/launch.json
@@ -0,0 +1,11 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "poker",
+      "runtimeExecutable": "node",
+      "runtimeArgs": ["server/index.js"],
+      "port": 4671
+    }
+  ]
+}
diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..2ff8fd0
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,6 @@
+# .env にコピーして値を設定する（chmod 600 推奨）
+ACCESS_KEY=000000
+PORT=4671
+# HOST=127.0.0.1
+# 本番のみ設定（ローカル開発では設定しない）
+# PUBLIC_ORIGIN=https://poker.kanawo.net
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..6313b56
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto eol=lf
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f77d70
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+node_modules/
+data/
+.env
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..fd029cf
--- /dev/null
+++ b/README.md
@@ -0,0 +1,140 @@
+# Hold'em Night
+
+友達専用のテキサスホールデム（リングゲーム）サイト。Node.js + Express + Socket.IO。
+
+現状は「鍵入力 → ロビー → テーブル作成 → プレイ画面（スタブ）」まで。カード配布・ベッティングなどのゲーム処理は未実装で、プレイ画面ではホストが「次へ（仮）」でフェーズを手動で進められる。
+
+## ローカルで動かす
+
+```bash
+cp .env.example .env   # ACCESS_KEY を設定
+npm install
+npm start
+```
+
+http://localhost:4671 を開く。
+
+## 設定（.env）
+
+秘密情報はソースコードに書かず、プロジェクト直下の `.env`（git 管理外）か環境変数で渡す。`ACCESS_KEY` が無いとサーバは起動しない。
+
+| 変数 | 既定値 | 内容 |
+| --- | --- | --- |
+| `ACCESS_KEY` | なし（必須） | 6桁の参加キー |
+| `PORT` | `4671` | 待ち受けポート |
+| `HOST` | `127.0.0.1` | 待ち受けアドレス。既定では外部から直接つながらない（nginx 経由で公開する） |
+| `PUBLIC_ORIGIN` | なし | 本番の公開URL `https://poker.kanawo.net`。設定するとこのドメイン以外（IP直打ちや別ドメイン）へのアクセスと、他オリジンからの操作を拒否する。ローカル開発では設定しない |
+| `SESSION_SECRET` | 自動生成 | Cookie 署名用。未指定なら `data/session-secret` に生成・保存 |
+
+## セキュリティ
+
+- **参加キー**: 正しいキーを入れたブラウザに HttpOnly / SameSite=Lax（HTTPS 時は Secure）の Cookie を保存。アクセスのたびに有効期限（400日）が延長されるので、以降は入力不要。
+- **総当たり対策**: 同じIP（IPv6 は /64 単位）から30分に5回間違えるとロック。サーバ全体で1時間に30回間違えると新規の鍵入力を一時停止（入室済みの人は影響なし）。失敗はログに出る（`journalctl -u holdem`）。
+- **入室状態の取り消し**: キーを変えるか、`data/session-secret` を削除して再起動すると、全員の Cookie が無効になる。
+- **CSRF / Cross-Site WebSocket**: 状態を変える API と WebSocket 接続は Origin が自サイトのときだけ受け付ける。Socket.IO は WebSocket のみ。
+- **XSS**: 厳格な CSP（インラインスクリプト・インラインスタイル禁止）、表示時のエスケープ、名前から制御文字・不可視文字を除去。
+- **その他**: クリックジャッキング防止（`frame-ancestors 'none'`）、`nosniff`、`no-referrer`、HTML/API は `no-store`、検索エンジン除外、エラー時に内部情報を返さない、リクエストサイズ・イベント連打・テーブル数の上限。
+- 他人の席を操作できないよう、席の持ち主を示すプレイヤーIDはブラウザ内だけに保存し、他のプレイヤーには送らない。
+
+6桁のキーはそれ自体が強い秘密ではないので、上記の回数制限が守りの要になっている。キーは友達にだけ直接伝えること。
+
+## 構成
+
+| パス | 内容 |
+| --- | --- |
+| `server/index.js` | HTTP ルーティング・セキュリティヘッダ・REST API・Socket.IO |
+| `server/auth.js` | 参加キー認証（Cookie）・回数制限・Origin チェック |
+| `server/tables.js` | テーブル状態（席・ボタン・ブラインド・フェーズ・タイマー） |
+| `server/config.js` | `.env` の読み込みと各種上限値 |
+| `public/assets/blinds.js` | ブラインド計算（サーバ・ブラウザ共用） |
+| `public/*.html`, `public/assets/*.js` | 各画面 |
+
+- テーブルはメモリ上にのみ保持（サーバ再起動で消える）。誰も接続していない状態が30分続くと自動削除。
+- 名前とプレイヤーID はブラウザの localStorage に保存。リロードしても同じ席に戻れる。
+- 作成者がホスト（👑）。ホストが退席すると次の着席者に移る。
+
+## VPS へのデプロイ例（Ubuntu + nginx + systemd + HTTPS）
+
+公開URLは https://poker.kanawo.net 。HTTPS なしで公開するとキーと Cookie が平文で流れるので、必ず nginx + Let's Encrypt 経由で公開する。
+
+事前に DNS で `poker.kanawo.net` の A レコード（IPv6 があれば AAAA も）を VPS の IP に向けておく。
+
+```bash
+# 専用ユーザーで動かす
+sudo useradd --system --home /opt/holdem --shell /usr/sbin/nologin holdem
+sudo git clone <このリポジトリ> /opt/holdem
+cd /opt/holdem
+sudo npm ci --omit=dev
+
+# 秘密情報（本人のみ読める）
+sudo cp .env.example .env
+sudo nano .env                       # ACCESS_KEY=197107, PUBLIC_ORIGIN=https://poker.kanawo.net を設定
+sudo mkdir -p data
+sudo chown -R holdem:holdem .env data
+sudo chmod 600 .env && sudo chmod 700 data
+```
+
+`/etc/systemd/system/holdem.service`:
+
+```ini
+[Unit]
+Description=Hold'em Night
+After=network.target
+
+[Service]
+User=holdem
+WorkingDirectory=/opt/holdem
+ExecStart=/usr/bin/node server/index.js
+Environment=NODE_ENV=production
+Restart=always
+
+# サンドボックス
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=true
+PrivateTmp=true
+PrivateDevices=true
+ReadWritePaths=/opt/holdem/data
+CapabilityBoundingSet=
+RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
+
+[Install]
+WantedBy=multi-user.target
+```
+
+nginx（`/etc/nginx/sites-available/holdem`、WebSocket を通す）:
+
+```nginx
+# poker.kanawo.net 以外のホスト名（IP直打ち等）は接続ごと切る
+server {
+    listen 80 default_server;
+    listen [::]:80 default_server;
+    server_name _;
+    return 444;
+}
+
+server {
+    server_name poker.kanawo.net;
+    client_max_body_size 8k;
+
+    location / {
+        proxy_pass http://127.0.0.1:4671;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $http_host;
+        proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 1h;
+    }
+}
+```
+
+```bash
+sudo ln -s /etc/nginx/sites-available/holdem /etc/nginx/sites-enabled/
+sudo certbot --nginx -d poker.kanawo.net      # HTTPS 化（HTTP→HTTPS リダイレクトも設定される）
+sudo systemctl daemon-reload && sudo systemctl enable --now holdem
+
+# ファイアウォール: 4671 は開けない（nginx だけが 127.0.0.1 経由で使う）
+sudo ufw allow OpenSSH && sudo ufw allow 'Nginx Full' && sudo ufw enable
+```
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..307e4fd
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1083 @@
+{
+  "name": "friends-holdem",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "friends-holdem",
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+        "socket.io": "^4.8.4"
+      },
+      "engines": {
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..1a6ecc4
--- /dev/null
+++ b/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "friends-holdem",
+  "version": "0.1.0",
+  "private": true,
+  "description": "友達用テキサスホールデム リングゲーム",
+  "main": "server/index.js",
+  "scripts": {
+    "start": "node server/index.js",
+    "dev": "node --watch server/index.js"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "dependencies": {
+    "express": "^4.22.3",
+    "socket.io": "^4.8.4"
+  }
+}
diff --git a/public/assets/blinds.js b/public/assets/blinds.js
new file mode 100644
index 0000000..c5e0ebb
--- /dev/null
+++ b/public/assets/blinds.js
@@ -0,0 +1,57 @@
+// ブラインド計算（サーバ・ブラウザ共用）
+(function (root, factory) {
+  if (typeof module === 'object' && module.exports) module.exports = factory();
+  else root.Blinds = factory();
+})(typeof self !== 'undefined' ? self : this, function () {
+  'use strict';
+
+  // 1, 2, 3, 4, 5, 6, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 150, ...
+  const MANTISSAS = [1, 1.5, 2, 2.5, 3, 4, 5, 6, 7.5];
+  const LADDER = [];
+  for (let e = 0; e <= 9; e++) {
+    for (const m of MANTISSAS) {
+      const v = Math.round(m * Math.pow(10, e) * 100) / 100;
+      if (Number.isInteger(v)) LADDER.push(v);
+    }
+  }
+
+  function nearestNice(x) {
+    if (!(x >= 1)) return 1;
+    let best = LADDER[0];
+    for (const v of LADDER) if (Math.abs(v - x) < Math.abs(best - x)) best = v;
+    return best;
+  }
+
+  // 開始スタックに合うブラインド（BB = スタックの約1/100）
+  function defaultBlinds(stack) {
+    const sb = nearestNice(stack / 200);
+    return { sb, bb: sb * 2 };
+  }
+
+  // 1レベルごとに約1.5倍
+  function nextSmallBlind(sb) {
+    const target = sb * 1.4;
+    for (const v of LADDER) if (v >= target && v > sb) return v;
+    return Math.ceil(sb * 1.5);
+  }
+
+  // level は 1 始まり
+  function blindsAt(sb0, bb0, level) {
+    const ratio = bb0 / sb0;
+    let sb = sb0;
+    let bb = bb0;
+    for (let i = 2; i <= level; i++) {
+      sb = nextSmallBlind(sb);
+      bb = Math.round(sb * ratio);
+    }
+    return { sb, bb };
+  }
+
+  function schedule(sb0, bb0, levels) {
+    const out = [];
+    for (let i = 1; i <= levels; i++) out.push(Object.assign({ level: i }, blindsAt(sb0, bb0, i)));
+    return out;
+  }
+
+  return { defaultBlinds, blindsAt, schedule };
+});
diff --git a/public/assets/common.js b/public/assets/common.js
new file mode 100644
index 0000000..03b498c
--- /dev/null
+++ b/public/assets/common.js
@@ -0,0 +1,99 @@
+// 各ページ共通のユーティリティ
+(function () {
+  'use strict';
+
+  function lsGet(key) {
+    try { return localStorage.getItem(key); } catch { return null; }
+  }
+  function lsSet(key, value) {
+    try { localStorage.setItem(key, value); } catch { /* プライベートモード等 */ }
+  }
+
+  // 非HTTPS環境でも動くよう crypto.randomUUID ではなく getRandomValues を使う
+  function randomHex(bytes) {
+    const a = new Uint8Array(bytes);
+    crypto.getRandomValues(a);
+    return Array.from(a, (b) => b.toString(16).padStart(2, '0')).join('');
+  }
+
+  const Store = {
+    get name() { return lsGet('poker.name') || ''; },
+    set name(v) { lsSet('poker.name', v); },
+    // 席の再接続用。ブラウザごとに固定
+    get token() {
+      let t = lsGet('poker.token');
+      if (!t || !/^[0-9a-f]{32}$/.test(t)) {
+        t = randomHex(16);
+        lsSet('poker.token', t);
+      }
+      return t;
+    },
+  };
+
+  function esc(s) {
+    return String(s).replace(/[&<>"']/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
+  }
+
+  function chips(n) {
+    return '$' + Number(n).toLocaleString('en-US');
+  }
+
+  let toastTimer;
+  function toast(msg) {
+    let el = document.querySelector('.toast');
+    if (!el) {
+      el = document.createElement('div');
+      el.className = 'toast';
+      document.body.appendChild(el);
+    }
+    el.textContent = msg;
+    el.hidden = false;
+    clearTimeout(toastTimer);
+    toastTimer = setTimeout(() => { el.hidden = true; }, 2500);
+  }
+
+  async function api(method, url, body) {
+    const res = await fetch(url, {
+      method,
+      headers: body ? { 'Content-Type': 'application/json' } : undefined,
+      body: body ? JSON.stringify(body) : undefined,
+      credentials: 'same-origin',
+    });
+    if (res.status === 401 && url !== '/api/auth') {
+      location.href = '/key?next=' + encodeURIComponent(location.pathname);
+      throw new Error('unauthorized');
+    }
+    const data = await res.json().catch(() => ({}));
+    if (!res.ok) throw new Error(data.error || 'エラーが発生しました');
+    return data;
+  }
+
+  // サーバは WebSocket のみ受け付ける。接続を拒否されたら鍵が無効になっていないか確認する
+  function connectSocket() {
+    const socket = io({ transports: ['websocket'] });
+    socket.on('connect_error', () => {
+      fetch('/api/tables', { credentials: 'same-origin' })
+        .then((res) => {
+          if (res.status === 401) location.href = '/key?next=' + encodeURIComponent(location.pathname);
+        })
+        .catch(() => {});
+    });
+    return socket;
+  }
+
+  // 自サイト内のパスだけ許可（"//x" や "/\x" は外部サイト扱いになるので拒否）
+  function safeNext(next) {
+    return typeof next === 'string' && /^\/(?![/\\])[^\\\s]*$/.test(next) && next.length <= 200 ? next : '/';
+  }
+
+  const PHASE_LABELS = {
+    WAITING: 'WAITING',
+    PREFLOP: 'PREFLOP',
+    FLOP: 'FLOP',
+    TURN: 'TURN',
+    RIVER: 'RIVER',
+    SHOWDOWN: 'SHOWDOWN',
+  };
+
+  window.App = { Store, esc, chips, toast, api, connectSocket, safeNext, PHASE_LABELS };
+})();
diff --git a/public/assets/create.js b/public/assets/create.js
new file mode 100644
index 0000000..0505be1
--- /dev/null
+++ b/public/assets/create.js
@@ -0,0 +1,143 @@
+(function () {
+  'use strict';
+
+  const { Store, api, chips } = App;
+  if (!Store.name) {
+    location.replace('/');
+    return;
+  }
+
+  const $ = (id) => document.getElementById(id);
+  const form = $('form');
+  const nameInput = $('table-name');
+  const stackInput = $('stack');
+  const sbInput = $('sb');
+  const bbInput = $('bb');
+  const timerInput = $('timer');
+  const intervalInput = $('interval');
+  const scheduleEl = $('schedule');
+  const blindHint = $('blind-hint');
+  const errorEl = $('error');
+  const submitBtn = $('submit');
+
+  // ブラインドを手で変えるまではスタックに追従させる
+  let blindsTouched = false;
+
+  async function suggestName() {
+    try {
+      const { name } = await api('GET', '/api/tables/suggest-name');
+      nameInput.value = name;
+    } catch { /* 失敗時は手入力 */ }
+  }
+
+  const int = (el) => {
+    const n = Number(el.value);
+    return Number.isInteger(n) ? n : NaN;
+  };
+
+  function applyDefaultBlinds() {
+    const stack = int(stackInput);
+    if (!(stack >= 10)) return;
+    const { sb, bb } = Blinds.defaultBlinds(stack);
+    sbInput.value = sb;
+    bbInput.value = bb;
+  }
+
+  function updateHint() {
+    const stack = int(stackInput);
+    const bb = int(bbInput);
+    if (blindsTouched && stack > 0 && bb > 0) {
+      blindHint.innerHTML = `開始スタック = ${Math.floor(stack / bb)} BB ・ <a href="#" id="reset-blinds" class="link-gold">おすすめに戻す</a>`;
+    } else {
+      blindHint.textContent = 'スタックに合わせて自動設定（BB ≒ スタックの1/100）';
+    }
+  }
+
+  function updateSchedule() {
+    const sb = int(sbInput);
+    const bb = int(bbInput);
+    const on = timerInput.checked;
+    intervalInput.disabled = !on;
+    scheduleEl.hidden = !on || !(sb > 0 && bb >= sb);
+    if (scheduleEl.hidden) return;
+    const mins = int(intervalInput) > 0 ? int(intervalInput) : 0;
+    scheduleEl.innerHTML = Blinds.schedule(sb, bb, 8)
+      .map((l, i) => `<span>Lv.${l.level} <b>${chips(l.sb)}/${chips(l.bb)}</b>${mins ? ` · ${i * mins}分〜` : ''}</span>`)
+      .join('');
+  }
+
+  function refresh() {
+    updateHint();
+    updateSchedule();
+  }
+
+  stackInput.addEventListener('input', () => {
+    if (!blindsTouched) applyDefaultBlinds();
+    refresh();
+  });
+  [sbInput, bbInput].forEach((el) =>
+    el.addEventListener('input', () => {
+      blindsTouched = true;
+      if (el === sbInput && int(sbInput) > 0) bbInput.value = int(sbInput) * 2;
+      refresh();
+    })
+  );
+  blindHint.addEventListener('click', (e) => {
+    if (e.target.id !== 'reset-blinds') return;
+    e.preventDefault();
+    blindsTouched = false;
+    applyDefaultBlinds();
+    refresh();
+  });
+  timerInput.addEventListener('change', refresh);
+  intervalInput.addEventListener('input', refresh);
+  $('reroll').addEventListener('click', suggestName);
+
+  function validate() {
+    const name = nameInput.value.trim();
+    const stack = int(stackInput);
+    const sb = int(sbInput);
+    const bb = int(bbInput);
+    const interval = int(intervalInput);
+    if (!name) return [nameInput, 'テーブル名を入力してください'];
+    if (!(stack >= 10)) return [stackInput, '開始スタックは10以上の整数にしてください'];
+    if (!(sb >= 1)) return [sbInput, 'SBは1以上の整数にしてください'];
+    if (!(bb >= sb)) return [bbInput, 'BBはSB以上にしてください'];
+    if (bb > stack) return [bbInput, 'BBが開始スタックより大きいです'];
+    if (timerInput.checked && !(interval >= 1 && interval <= 240)) return [intervalInput, 'インターバルは1〜240分にしてください'];
+    return null;
+  }
+
+  form.addEventListener('submit', async (e) => {
+    e.preventDefault();
+    form.querySelectorAll('.invalid').forEach((el) => el.classList.remove('invalid'));
+    const problem = validate();
+    if (problem) {
+      problem[0].classList.add('invalid');
+      problem[0].focus();
+      errorEl.textContent = problem[1];
+      return;
+    }
+    errorEl.textContent = '';
+    submitBtn.disabled = true;
+    try {
+      const { id } = await api('POST', '/api/tables', {
+        name: nameInput.value.trim(),
+        startingStack: int(stackInput),
+        smallBlind: int(sbInput),
+        bigBlind: int(bbInput),
+        blindTimerEnabled: timerInput.checked,
+        blindIntervalMin: int(intervalInput),
+        token: Store.token,
+      });
+      location.href = '/table/' + encodeURIComponent(id);
+    } catch (err) {
+      errorEl.textContent = err.message;
+      submitBtn.disabled = false;
+    }
+  });
+
+  applyDefaultBlinds();
+  refresh();
+  suggestName();
+})();
diff --git a/public/assets/key.js b/public/assets/key.js
new file mode 100644
index 0000000..fcc0e56
--- /dev/null
+++ b/public/assets/key.js
@@ -0,0 +1,82 @@
+(function () {
+  'use strict';
+
+  const form = document.getElementById('form');
+  const box = document.getElementById('digits');
+  const inputs = [...box.querySelectorAll('input')];
+  const errorEl = document.getElementById('error');
+  const submitBtn = document.getElementById('submit');
+  let busy = false;
+
+  const value = () => inputs.map((i) => i.value).join('');
+
+  function fill(digits, from) {
+    let i = from;
+    for (const d of digits) {
+      if (i >= inputs.length) break;
+      inputs[i++].value = d;
+    }
+    inputs[Math.min(i, inputs.length - 1)].focus();
+    if (value().length === 6) submit();
+  }
+
+  inputs.forEach((input, idx) => {
+    input.addEventListener('input', () => {
+      const digits = input.value.replace(/\D/g, '');
+      input.value = '';
+      if (digits) fill(digits, idx);
+      errorEl.textContent = '';
+    });
+    input.addEventListener('keydown', (e) => {
+      if (e.key === 'Backspace' && !input.value && idx > 0) {
+        inputs[idx - 1].value = '';
+        inputs[idx - 1].focus();
+        e.preventDefault();
+      } else if (e.key === 'ArrowLeft' && idx > 0) {
+        inputs[idx - 1].focus();
+      } else if (e.key === 'ArrowRight' && idx < inputs.length - 1) {
+        inputs[idx + 1].focus();
+      }
+    });
+    input.addEventListener('paste', (e) => {
+      const digits = (e.clipboardData.getData('text') || '').replace(/\D/g, '');
+      if (!digits) return;
+      e.preventDefault();
+      fill(digits, idx);
+    });
+    input.addEventListener('focus', () => input.select());
+  });
+
+  async function submit() {
+    if (busy) return;
+    const key = value();
+    if (key.length !== 6) {
+      errorEl.textContent = '6桁すべて入力してください。';
+      return;
+    }
+    busy = true;
+    submitBtn.disabled = true;
+    try {
+      await App.api('POST', '/api/auth', { key });
+      const next = new URLSearchParams(location.search).get('next');
+      location.replace(App.safeNext(next));
+    } catch (err) {
+      errorEl.textContent = err.message;
+      box.classList.remove('shake');
+      void box.offsetWidth;
+      box.classList.add('shake');
+      inputs.forEach((i) => { i.value = ''; });
+      inputs[0].focus();
+    } finally {
+      busy = false;
+      submitBtn.disabled = false;
+    }
+  }
+
+  form.addEventListener('submit', (e) => {
+    e.preventDefault();
+    submit();
+  });
+
+  inputs[0].focus();
+})();
diff --git a/public/assets/lobby.js b/public/assets/lobby.js
new file mode 100644
index 0000000..5c5abfd
--- /dev/null
+++ b/public/assets/lobby.js
@@ -0,0 +1,72 @@
+(function () {
+  'use strict';
+
+  const { Store, esc, chips } = App;
+  const nameInput = document.getElementById('name');
+  const nameError = document.getElementById('name-error');
+  const listEl = document.getElementById('list');
+  const countEl = document.getElementById('count');
+
+  nameInput.value = Store.name;
+  nameInput.addEventListener('input', () => {
+    Store.name = nameInput.value.trim();
+    nameInput.classList.remove('invalid');
+    nameError.textContent = '';
+  });
+
+  function requireName() {
+    if (Store.name) return true;
+    nameInput.classList.add('invalid');
+    nameError.textContent = '先に名前を入力してください。';
+    nameInput.focus();
+    return false;
+  }
+
+  document.getElementById('create').addEventListener('click', () => {
+    if (requireName()) location.href = '/create';
+  });
+
+  listEl.addEventListener('click', (e) => {
+    const btn = e.target.closest('[data-join]');
+    if (btn && requireName()) location.href = '/table/' + encodeURIComponent(btn.dataset.join);
+  });
+
+  function phaseBadge(t) {
+    if (t.paused) return '<span class="badge paused">PAUSED</span>';
+    if (t.phase === 'WAITING') return '<span class="badge">WAITING</span>';
+    return '<span class="badge live">PLAYING</span>';
+  }
+
+  function render(tables) {
+    countEl.textContent = tables.length ? `${tables.length} テーブル` : '';
+    if (!tables.length) {
+      listEl.innerHTML = '<div class="empty">開催中のテーブルはありません。<br>テーブルを作成して友達を招待しよう。</div>';
+      return;
+    }
+    listEl.innerHTML = tables
+      .map((t) => {
+        const full = t.playerCount >= t.maxSeats;
+        const timer = t.timerEnabled ? `⏱ ${t.intervalMin}分` : '⏱ なし';
+        return `
+          <div class="table-item">
+            <div class="info">
+              <div class="name">${esc(t.name)}${phaseBadge(t)}</div>
+              <div class="meta">
+                <span>👤 <b>${t.playerCount}/${t.maxSeats}</b></span>
+                <span>開始 <b>${chips(t.startingStack)}</b></span>
+                <span class="gold">Lv.${t.level} <b class="gold">${chips(t.smallBlind)}/${chips(t.bigBlind)}</b></span>
+                <span>${timer}</span>
+              </div>
+            </div>
+            <button class="btn btn-blue btn-sm" data-join="${esc(t.id)}" ${full ? 'title="満席（観戦のみ）"' : ''}>
+              ${full ? '観戦' : '参加'}
+            </button>
+          </div>`;
+      })
+      .join('');
+  }
+
+  const socket = App.connectSocket();
+  socket.on('connect', () => socket.emit('lobby:subscribe'));
+  socket.on('lobby:tables', render);
+})();
diff --git a/public/assets/style.css b/public/assets/style.css
new file mode 100644
index 0000000..138fbbb
--- /dev/null
+++ b/public/assets/style.css
@@ -0,0 +1,514 @@
+:root {
+  --bg: #24493b;
+  --bg-deep: #1b3a2e;
+  --panel: #1a2620;
+  --panel-2: #26332c;
+  --input: #303a35;
+  --line: #3a4a42;
+  --text: #f2f5f3;
+  --muted: #9fb2a8;
+  --felt: #2ecc71;
+  --felt-dark: #23a85b;
+  --gold: #f6c744;
+  --orange: #f0a43a;
+  --blue: #4a90e2;
+  --green: #2ecc71;
+  --red: #ff5a5a;
+  --radius: 14px;
+  color-scheme: dark;
+}
+
+* { box-sizing: border-box; }
+
+html, body {
+  margin: 0;
+  min-height: 100%;
+  background: var(--bg);
+  color: var(--text);
+  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Segoe UI", sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -webkit-tap-highlight-color: transparent;
+}
+
+body { min-height: 100dvh; }
+
+.wrap {
+  max-width: 480px;
+  margin: 0 auto;
+  padding: 24px 16px 40px;
+}
+
+h1, h2, h3 { margin: 0; }
+
+.logo {
+  text-align: center;
+  font-weight: 900;
+  line-height: 0.95;
+  letter-spacing: -0.02em;
+  font-size: 48px;
+  margin: 28px 0 32px;
+}
+.logo small {
+  display: block;
+  font-size: 13px;
+  font-weight: 700;
+  letter-spacing: 0.3em;
+  color: var(--gold);
+  margin-top: 10px;
+}
+
+.section-title {
+  font-size: 18px;
+  font-weight: 800;
+  margin: 28px 0 12px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+}
+.section-title .sub { font-size: 12px; font-weight: 600; color: var(--muted); }
+
+label, .label {
+  display: block;
+  font-size: 14px;
+  color: var(--muted);
+  margin: 18px 0 8px;
+}
+
+input[type="text"], input[type="number"], input[type="tel"] {
+  width: 100%;
+  font: inherit;
+  font-size: 18px;
+  color: var(--text);
+  background: var(--input);
+  border: 2px solid transparent;
+  border-radius: 10px;
+  padding: 14px 16px;
+  outline: none;
+  transition: border-color 0.15s;
+}
+input:focus { border-color: var(--felt); }
+input:disabled { opacity: 0.4; }
+input.invalid { border-color: var(--red); }
+
+.row { display: flex; gap: 10px; align-items: center; }
+.row > * { flex: 1; min-width: 0; }
+
+.btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  font: inherit;
+  font-size: 17px;
+  font-weight: 800;
+  border: 0;
+  border-radius: 10px;
+  padding: 14px 18px;
+  color: #fff;
+  cursor: pointer;
+  text-decoration: none;
+  transition: transform 0.06s, filter 0.15s, opacity 0.15s;
+  white-space: nowrap;
+}
+.btn:active:not(:disabled) { transform: scale(0.97); }
+.btn:disabled { opacity: 0.4; cursor: default; }
+.btn-orange { background: var(--orange); }
+.btn-blue { background: var(--blue); }
+.btn-green { background: var(--green); }
+.btn-dark { background: var(--panel-2); color: var(--text); }
+.btn-ghost { background: transparent; color: var(--muted); border: 2px solid var(--line); }
+.btn-block { width: 100%; }
+.btn-sm { font-size: 14px; padding: 9px 14px; border-radius: 8px; }
+
+.icon-btn {
+  width: 44px;
+  height: 44px;
+  border-radius: 50%;
+  border: 2px solid rgba(255, 255, 255, 0.15);
+  background: rgba(0, 0, 0, 0.18);
+  color: var(--text);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  font-size: 18px;
+  text-decoration: none;
+  flex: none;
+}
+
+.divider { height: 1px; background: var(--line); margin: 24px 0; }
+
+.error-text { color: var(--red); font-size: 14px; min-height: 20px; margin-top: 10px; }
+.hint { color: var(--muted); font-size: 12px; margin-top: 6px; }
+
+.card {
+  background: var(--panel);
+  border-radius: var(--radius);
+  padding: 16px;
+}
+
+/* ---------- 鍵入力 ---------- */
+.key-inputs { display: flex; gap: 6px; justify-content: center; margin: 8px 0 4px; }
+.key-inputs input {
+  flex: 1;
+  min-width: 0;
+  max-width: 52px;
+  height: 60px;
+  padding: 0;
+  text-align: center;
+  font-size: 28px;
+  font-weight: 800;
+}
+.shake { animation: shake 0.35s; }
+@keyframes shake {
+  20%, 60% { transform: translateX(-8px); }
+  40%, 80% { transform: translateX(8px); }
+}
+
+/* ---------- ロビー ---------- */
+.table-list { display: flex; flex-direction: column; gap: 10px; }
+.table-item {
+  background: var(--panel);
+  border-radius: var(--radius);
+  padding: 14px 14px 14px 16px;
+  display: flex;
+  gap: 12px;
+  align-items: center;
+}
+.table-item .info { flex: 1; min-width: 0; }
+.table-item .name {
+  font-weight: 800;
+  font-size: 17px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.table-item .meta {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px 12px;
+  font-size: 13px;
+  color: var(--muted);
+  margin-top: 6px;
+}
+.table-item .meta b { color: var(--text); font-weight: 700; }
+.table-item .meta .gold { color: var(--gold); }
+
+.badge {
+  display: inline-block;
+  font-size: 11px;
+  font-weight: 800;
+  letter-spacing: 0.05em;
+  padding: 3px 8px;
+  border-radius: 999px;
+  background: var(--panel-2);
+  color: var(--muted);
+  vertical-align: 2px;
+  margin-left: 6px;
+}
+.badge.live { background: rgba(46, 204, 113, 0.18); color: var(--green); }
+.badge.paused { background: rgba(255, 90, 90, 0.15); color: var(--red); }
+
+.empty {
+  text-align: center;
+  color: var(--muted);
+  padding: 32px 16px;
+  border: 2px dashed var(--line);
+  border-radius: var(--radius);
+  font-size: 14px;
+}
+
+/* ---------- テーブル作成 ---------- */
+.topbar { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
+.topbar h1 { font-size: 20px; flex: 1; }
+
+.switch-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-top: 22px;
+  font-weight: 800;
+  font-size: 17px;
+}
+.switch { position: relative; width: 52px; height: 30px; flex: none; }
+.switch input { opacity: 0; width: 0; height: 0; position: absolute; }
+.switch span {
+  position: absolute;
+  inset: 0;
+  background: var(--input);
+  border-radius: 999px;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+.switch span::before {
+  content: "";
+  position: absolute;
+  width: 24px;
+  height: 24px;
+  left: 3px;
+  top: 3px;
+  background: #ddd;
+  border-radius: 50%;
+  transition: transform 0.2s, background 0.2s;
+}
+.switch input:checked + span { background: var(--green); }
+.switch input:checked + span::before { transform: translateX(22px); background: #fff; }
+.switch input:focus-visible + span { outline: 2px solid var(--gold); }
+
+.unit-input { position: relative; }
+.unit-input input { padding-right: 56px; }
+.unit-input .unit {
+  position: absolute;
+  right: 16px;
+  top: 50%;
+  transform: translateY(-50%);
+  color: var(--muted);
+  font-weight: 700;
+  pointer-events: none;
+}
+
+.schedule {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-top: 10px;
+}
+.schedule span {
+  font-size: 12px;
+  background: var(--panel);
+  color: var(--muted);
+  padding: 4px 8px;
+  border-radius: 6px;
+}
+.schedule span b { color: var(--gold); font-weight: 700; }
+
+/* ---------- プレイ画面 ---------- */
+.table-page { display: flex; flex-direction: column; min-height: 100dvh; }
+.table-page .wrap { padding-top: 16px; padding-bottom: 0; flex: 1; display: flex; flex-direction: column; width: 100%; }
+
+.table-header { display: flex; align-items: center; gap: 12px; }
+.table-header h1 {
+  flex: 1;
+  text-align: center;
+  font-size: 22px;
+  font-weight: 800;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.icon-btn.leave { color: var(--red); border-color: rgba(255, 90, 90, 0.35); }
+
+.host-controls { display: flex; justify-content: center; gap: 8px; margin: 16px 0 12px; flex-wrap: wrap; }
+.host-controls .btn { border-radius: 999px; padding: 10px 16px; font-size: 14px; }
+
+.level-bar {
+  background: var(--panel);
+  border-radius: var(--radius);
+  padding: 12px 16px;
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+.level-bar .lv { color: var(--gold); font-weight: 800; }
+.level-bar .blinds { font-weight: 800; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.level-bar .timer { font-variant-numeric: tabular-nums; font-weight: 800; font-size: 18px; }
+.level-bar .timer.warn { color: var(--orange); }
+.level-bar .timer.paused { color: var(--red); }
+.level-sub { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin: 6px 4px 0; }
+
+.felt-area {
+  position: relative;
+  flex: 1;
+  min-height: 400px;
+  margin: 8px 0;
+}
+.felt {
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  width: 62%;
+  height: 72%;
+  transform: translate(-50%, -50%);
+  border-radius: 999px;
+  background: radial-gradient(ellipse at center, var(--felt) 0%, var(--felt-dark) 100%);
+  box-shadow: 0 0 0 14px rgba(46, 204, 113, 0.18), inset 0 0 40px rgba(0, 0, 0, 0.15);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+}
+.pot-label { font-weight: 900; color: rgba(0, 0, 0, 0.3); letter-spacing: 0.1em; font-size: 14px; }
+.pot {
+  font-size: 40px;
+  font-weight: 900;
+  color: var(--gold);
+  text-shadow: 0 3px 0 rgba(0, 0, 0, 0.3);
+  line-height: 1;
+}
+.phase {
+  margin-top: 8px;
+  background: rgba(0, 0, 0, 0.18);
+  color: #fff;
+  font-weight: 900;
+  letter-spacing: 0.08em;
+  font-size: 13px;
+  padding: 5px 14px;
+  border-radius: 999px;
+}
+.hand-no { font-size: 11px; color: rgba(0, 0, 0, 0.45); font-weight: 700; margin-top: 2px; }
+
+.seat {
+  position: absolute;
+  transform: translate(-50%, -50%);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 92px;
+  transition: left 0.3s, top 0.3s;
+}
+.avatar {
+  width: 58px;
+  height: 58px;
+  border-radius: 50%;
+  background: #3b4a5c;
+  border: 3px solid #8a96a3;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+}
+.avatar svg { width: 28px; height: 28px; fill: #fff; }
+.seat.me .avatar { background: #d35400; border-color: var(--gold); }
+.seat.offline .avatar { opacity: 0.45; }
+.nameplate {
+  margin-top: -10px;
+  background: rgba(10, 30, 20, 0.88);
+  border-radius: 10px;
+  padding: 4px 8px;
+  min-width: 84px;
+  max-width: 92px;
+  text-align: center;
+  position: relative;
+}
+.nameplate .pname {
+  font-size: 12px;
+  font-weight: 700;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.nameplate .pstack { font-size: 13px; font-weight: 800; color: var(--gold); }
+.chip-marker {
+  position: absolute;
+  width: 24px;
+  height: 24px;
+  border-radius: 50%;
+  font-size: 11px;
+  font-weight: 900;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: 2px solid #222;
+}
+.chip-marker.dealer { background: #fff; color: #111; top: -4px; right: -8px; }
+.blind-marker {
+  position: absolute;
+  top: -4px;
+  left: -10px;
+  font-size: 10px;
+  font-weight: 900;
+  padding: 2px 5px;
+  border-radius: 6px;
+  color: #111;
+}
+.blind-marker.sb { background: #7fd3ff; }
+.blind-marker.bb { background: var(--gold); }
+.host-mark { position: absolute; bottom: -2px; right: -6px; font-size: 14px; }
+.offline-tag { font-size: 10px; color: var(--muted); }
+
+.spectator-note {
+  text-align: center;
+  font-size: 13px;
+  color: var(--muted);
+  margin-bottom: 8px;
+}
+
+.action-bar {
+  background: #161c19;
+  padding: 12px 16px calc(14px + env(safe-area-inset-bottom));
+}
+.action-bar .inner { max-width: 480px; margin: 0 auto; }
+.my-stack {
+  text-align: center;
+  font-size: 28px;
+  font-weight: 900;
+  margin-bottom: 10px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 10px;
+}
+.my-stack .wallet { color: var(--gold); font-size: 22px; }
+.actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
+.actions .btn { background: #555; color: #bbb; font-size: 18px; }
+
+.modal-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.6);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 16px;
+  z-index: 10;
+}
+.modal { background: var(--bg-deep); border-radius: var(--radius); padding: 20px; width: 100%; max-width: 380px; }
+.modal h2 { font-size: 18px; margin-bottom: 4px; }
+
+.toast {
+  position: fixed;
+  left: 50%;
+  bottom: 160px;
+  transform: translateX(-50%);
+  background: rgba(0, 0, 0, 0.85);
+  color: #fff;
+  padding: 10px 16px;
+  border-radius: 10px;
+  font-size: 14px;
+  z-index: 20;
+  pointer-events: none;
+  max-width: calc(100% - 32px);
+  text-align: center;
+}
+
+.center-message { text-align: center; padding: 60px 16px; color: var(--muted); }
+.center-message h2 { color: var(--text); margin-bottom: 12px; }
+
+.conn-lost {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  background: var(--red);
+  color: #fff;
+  text-align: center;
+  font-size: 13px;
+  font-weight: 700;
+  padding: 6px;
+  z-index: 30;
+}
+
+[hidden] { display: none !important; }
+
+/* ---------- ユーティリティ（CSP で style 属性を使わないため） ---------- */
+.text-center { text-align: center; }
+.mt-4 { margin-top: 4px; }
+.mt-8 { margin-top: 8px; }
+.mt-12 { margin-top: 12px; }
+.key-title { font-size: 18px; text-align: center; }
+.key-hint { text-align: center; margin: 6px 0 16px; }
+.slash { flex: none !important; color: var(--muted); font-weight: 800; }
+label.switch { margin: 0; display: inline-block; }
+.link-gold { color: var(--gold); }
+.host-spacer { height: 12px; }
diff --git a/public/assets/table.js b/public/assets/table.js
new file mode 100644
index 0000000..d967930
--- /dev/null
+++ b/public/assets/table.js
@@ -0,0 +1,187 @@
+// プレイ画面（スタブ）: サーバから受け取ったテーブル状態を表示するだけ
+(function () {
+  'use strict';
+
+  const { Store, esc, chips, toast } = App;
+  const $ = (id) => document.getElementById(id);
+  const tableId = decodeURIComponent(location.pathname.split('/').pop());
+
+  const AVATAR_SVG =
+    '<svg viewBox="0 0 24 24" aria-hidden="true"><circle cx="12" cy="8" r="4.5"/><path d="M3 21c0-4.4 4-7.5 9-7.5s9 3.1 9 7.5z"/></svg>';
+
+  let socket = null;
+  let state = null;
+  let clockOffset = 0; // serverNow - clientNow
+
+  // ---------- 名前 ----------
+  function ensureName() {
+    if (Store.name) return connect();
+    $('name-modal').hidden = false;
+    $('name-input').focus();
+  }
+  $('name-form').addEventListener('submit', (e) => {
+    e.preventDefault();
+    const name = $('name-input').value.trim();
+    if (!name) return $('name-input').classList.add('invalid');
+    Store.name = name;
+    $('name-modal').hidden = true;
+    connect();
+  });
+
+  // ---------- 通信 ----------
+  function connect() {
+    socket = App.connectSocket();
+    socket.on('connect', () => {
+      $('conn-lost').hidden = true;
+      socket.emit('table:join', { tableId, token: Store.token, name: Store.name }, (res) => {
+        if (res && res.ok) return;
+        if (res && res.error === 'NOT_FOUND') return showNotFound();
+        toast('参加できませんでした: ' + ((res && res.error) || '不明なエラー'));
+      });
+    });
+    socket.on('disconnect', () => { $('conn-lost').hidden = false; });
+    socket.on('connect_error', () => { $('conn-lost').hidden = false; });
+    socket.on('table:state', (s) => {
+      state = s;
+      clockOffset = s.serverNow - Date.now();
+      render();
+    });
+  }
+
+  function emit(event) {
+    if (!socket) return;
+    socket.emit(event, null, (res) => {
+      if (res && !res.ok) toast(res.error === 'NOT_FOUND' ? 'テーブルが見つかりません' : res.error);
+    });
+  }
+
+  function showNotFound() {
+    $('main').hidden = true;
+    $('action-bar').hidden = true;
+    $('not-found').hidden = false;
+    if (socket) socket.disconnect();
+  }
+
+  // ---------- 描画 ----------
+  function render() {
+    const s = state;
+    $('main').hidden = false;
+    document.title = `${s.name} - Hold'em Night`;
+    $('table-name').textContent = s.name;
+
+    $('level').textContent = `Lv.${s.level}`;
+    $('blinds').textContent = `SB: ${chips(s.smallBlind)} / BB: ${chips(s.bigBlind)}`;
+    $('next-blinds').textContent = s.timer.enabled
+      ? `次: ${chips(s.nextBlinds.smallBlind)} / ${chips(s.nextBlinds.bigBlind)}（${s.timer.intervalMin}分毎）`
+      : 'ブラインドタイマーなし';
+    $('stack-info').textContent = `開始スタック ${chips(s.startingStack)}`;
+
+    $('pot').textContent = chips(s.pot);
+    $('phase').textContent = App.PHASE_LABELS[s.phase] || s.phase;
+    $('hand-no').textContent = s.handNumber ? `Hand #${s.handNumber}` : '';
+
+    // ホスト操作
+    const players = s.seats.filter(Boolean).length;
+    $('host-controls').hidden = !s.isHost;
+    $('host-spacer').hidden = s.isHost;
+    $('start').disabled = s.phase !== 'WAITING' || players < 2;
+    $('start').title = players < 2 ? '2人以上で開始できます' : '';
+    $('next-phase').disabled = s.phase === 'WAITING';
+    $('pause').disabled = !s.started;
+    $('pause').textContent = s.paused ? '再開' : '一時停止';
+
+    // 自分
+    const me = s.mySeat >= 0 ? s.seats[s.mySeat] : null;
+    $('action-bar').hidden = !me;
+    $('spectator-note').hidden = Boolean(me);
+    $('leave').title = me ? '退席する' : 'ロビーへ戻る';
+    if (me) $('my-stack').textContent = chips(me.stack);
+
+    renderSeats(s);
+    renderTimer();
+  }
+
+  // 着席者を楕円上に配置。自分が一番下、そこから時計回り。
+  function renderSeats(s) {
+    const occupied = s.seats.filter(Boolean);
+    const startIdx = Math.max(0, occupied.findIndex((p) => p.seat === s.mySeat));
+    const ordered = occupied.slice(startIdx).concat(occupied.slice(0, startIdx));
+    const n = ordered.length;
+
+    const container = $('seats');
+    container.innerHTML = ordered
+      .map((p) => {
+        const classes = ['seat'];
+        if (p.seat === s.mySeat) classes.push('me');
+        if (!p.connected) classes.push('offline');
+        const markers = [
+          p.seat === s.buttonSeat ? '<span class="chip-marker dealer" title="ディーラーボタン">D</span>' : '',
+          p.seat === s.sbSeat ? '<span class="blind-marker sb">SB</span>' : '',
+          p.seat === s.bbSeat ? '<span class="blind-marker bb">BB</span>' : '',
+        ].join('');
+        return `
+          <div class="${classes.join(' ')}">
+            <div class="avatar">${AVATAR_SVG}${markers}</div>
+            <div class="nameplate">
+              <div class="pname">${p.seat === s.hostSeat ? '<span title="ホスト">👑</span>' : ''}${esc(p.name)}</div>
+              <div class="pstack">${chips(p.stack)}</div>
+              ${p.connected ? '' : '<div class="offline-tag">オフライン</div>'}
+            </div>
+          </div>`;
+      })
+      .join('');
+
+    // 位置は CSSOM で設定（CSP で style 属性を禁止しているため）
+    [...container.children].forEach((el, i) => {
+      const angle = Math.PI / 2 + (i * 2 * Math.PI) / Math.max(n, 1);
+      el.style.left = `${(50 + 38 * Math.cos(angle)).toFixed(2)}%`;
+      el.style.top = `${(50 + 41 * Math.sin(angle)).toFixed(2)}%`;
+    });
+  }
+
+  function renderTimer() {
+    const el = $('timer');
+    if (!state) return;
+    const t = state.timer;
+    el.classList.toggle('paused', state.paused);
+    if (!t.enabled) {
+      el.textContent = state.paused ? '⏸ PAUSED' : '';
+      return;
+    }
+    const remaining = t.running ? t.endsAt - (Date.now() + clockOffset) : t.remainingMs;
+    const sec = Math.max(0, Math.ceil(remaining / 1000));
+    const time = `${Math.floor(sec / 60)}:${String(sec % 60).padStart(2, '0')}`;
+    el.textContent = state.paused ? `⏸ ${time}` : time;
+    el.classList.toggle('warn', t.running && sec <= 60);
+  }
+  setInterval(renderTimer, 250);
+
+  // ---------- 操作 ----------
+  $('start').addEventListener('click', () => emit('table:start'));
+  $('next-phase').addEventListener('click', () => emit('table:nextPhase'));
+  $('pause').addEventListener('click', () => emit('table:pause'));
+
+  $('leave').addEventListener('click', () => {
+    const seated = state && state.mySeat >= 0;
+    if (!seated) return (location.href = '/');
+    if (!confirm('テーブルから退席しますか？（チップは失われます）')) return;
+    socket.emit('table:leave', null, () => { location.href = '/'; });
+  });
+
+  $('share').addEventListener('click', async () => {
+    const url = location.origin + '/';
+    try {
+      await navigator.clipboard.writeText(url);
+    } catch {
+      const ta = document.createElement('textarea');
+      ta.value = url;
+      document.body.appendChild(ta);
+      ta.select();
+      document.execCommand('copy');
+      ta.remove();
+    }
+    toast('サイトのリンクをコピーしました');
+  });
+
+  ensureName();
+})();
diff --git a/public/create.html b/public/create.html
new file mode 100644
index 0000000..d04329c
--- /dev/null
+++ b/public/create.html
@@ -0,0 +1,60 @@
+<!doctype html>
+<html lang="ja">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+  <meta name="theme-color" content="#24493b">
+  <meta name="robots" content="noindex, nofollow">
+  <title>テーブル作成 - Hold'em Night</title>
+  <link rel="stylesheet" href="/assets/style.css">
+</head>
+<body>
+  <main class="wrap">
+    <div class="topbar">
+      <a class="icon-btn" href="/" aria-label="戻る">←</a>
+      <h1>テーブルを作成</h1>
+    </div>
+
+    <form id="form" novalidate>
+      <label for="table-name">テーブル名</label>
+      <div class="row">
+        <input id="table-name" type="text" maxlength="24" required>
+        <button type="button" class="icon-btn" id="reroll" aria-label="別の名前にする">🎲</button>
+      </div>
+
+      <label for="stack">開始スタック</label>
+      <input id="stack" type="number" inputmode="numeric" min="10" step="1" value="1000">
+
+      <div class="label">開始ブラインド（SB / BB）</div>
+      <div class="row">
+        <input id="sb" type="number" inputmode="numeric" min="1" step="1" aria-label="スモールブラインド">
+        <span class="slash">/</span>
+        <input id="bb" type="number" inputmode="numeric" min="1" step="1" aria-label="ビッグブラインド">
+      </div>
+      <div class="hint" id="blind-hint">スタックに合わせて自動設定（BB ≒ スタックの1/100）</div>
+
+      <div class="switch-row">
+        <span>ブラインドタイマー</span>
+        <label class="switch">
+          <input id="timer" type="checkbox" aria-label="ブラインドタイマー">
+          <span></span>
+        </label>
+      </div>
+
+      <label for="interval">インターバル</label>
+      <div class="unit-input">
+        <input id="interval" type="number" inputmode="numeric" min="1" max="240" step="1" value="10" disabled>
+        <span class="unit">min</span>
+      </div>
+      <div class="schedule" id="schedule" hidden></div>
+
+      <div class="error-text" id="error"></div>
+      <button class="btn btn-orange btn-block mt-8" id="submit" type="submit">テーブルを作成</button>
+    </form>
+  </main>
+
+  <script src="/assets/common.js"></script>
+  <script src="/assets/blinds.js"></script>
+  <script src="/assets/create.js"></script>
+</body>
+</html>
diff --git a/public/key.html b/public/key.html
new file mode 100644
index 0000000..e2b33ce
--- /dev/null
+++ b/public/key.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<html lang="ja">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+  <meta name="theme-color" content="#24493b">
+  <meta name="robots" content="noindex, nofollow">
+  <title>Hold'em Night</title>
+  <link rel="stylesheet" href="/assets/style.css">
+</head>
+<body>
+  <main class="wrap">
+    <div class="logo">Hold'em<br>Night<small>PRIVATE CLUB</small></div>
+
+    <form id="form" class="card" autocomplete="off">
+      <h2 class="key-title">参加キーを入力</h2>
+      <p class="hint key-hint">オーナーから教えてもらった6桁の数字</p>
+      <div class="key-inputs" id="digits">
+        <input type="tel" inputmode="numeric" aria-label="1桁目" autocomplete="one-time-code">
+        <input type="tel" inputmode="numeric" aria-label="2桁目">
+        <input type="tel" inputmode="numeric" aria-label="3桁目">
+        <input type="tel" inputmode="numeric" aria-label="4桁目">
+        <input type="tel" inputmode="numeric" aria-label="5桁目">
+        <input type="tel" inputmode="numeric" aria-label="6桁目">
+      </div>
+      <div class="error-text text-center" id="error"></div>
+      <button class="btn btn-orange btn-block mt-8" id="submit" type="submit">入室する</button>
+    </form>
+  </main>
+  <script src="/assets/common.js"></script>
+  <script src="/assets/key.js"></script>
+</body>
+</html>
diff --git a/public/lobby.html b/public/lobby.html
new file mode 100644
index 0000000..b6426c0
--- /dev/null
+++ b/public/lobby.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<html lang="ja">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+  <meta name="theme-color" content="#24493b">
+  <meta name="robots" content="noindex, nofollow">
+  <title>Hold'em Night</title>
+  <link rel="stylesheet" href="/assets/style.css">
+</head>
+<body>
+  <main class="wrap">
+    <div class="logo">Hold'em<br>Night<small>PRIVATE CLUB</small></div>
+
+    <label for="name">あなたの名前</label>
+    <input id="name" type="text" maxlength="12" placeholder="例: とらのすけ" autocomplete="nickname">
+    <div class="error-text" id="name-error"></div>
+
+    <button id="create" class="btn btn-orange btn-block mt-4" type="button">＋ テーブルを作成</button>
+
+    <div class="section-title">
+      <span>開催中のテーブル</span>
+      <span class="sub" id="count"></span>
+    </div>
+    <div class="table-list" id="list">
+      <div class="empty">読み込み中…</div>
+    </div>
+  </main>
+
+  <script src="/socket.io/socket.io.js"></script>
+  <script src="/assets/common.js"></script>
+  <script src="/assets/lobby.js"></script>
+</body>
+</html>
diff --git a/public/table.html b/public/table.html
new file mode 100644
index 0000000..8c20dc2
--- /dev/null
+++ b/public/table.html
@@ -0,0 +1,81 @@
+<!doctype html>
+<html lang="ja">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+  <meta name="theme-color" content="#24493b">
+  <meta name="robots" content="noindex, nofollow">
+  <title>テーブル - Hold'em Night</title>
+  <link rel="stylesheet" href="/assets/style.css">
+</head>
+<body class="table-page">
+  <div class="conn-lost" id="conn-lost" hidden>接続が切れました。再接続中…</div>
+
+  <main class="wrap" id="main" hidden>
+    <div class="table-header">
+      <button class="icon-btn leave" id="leave" aria-label="退席する" title="退席する">⏏</button>
+      <h1 id="table-name"></h1>
+      <button class="icon-btn" id="share" aria-label="サイトのリンクをコピー" title="サイトのリンクをコピー">🔗</button>
+    </div>
+
+    <div class="host-controls" id="host-controls" hidden>
+      <button class="btn btn-green" id="start">START ▶</button>
+      <button class="btn btn-dark" id="next-phase" title="プレイ未実装のため手動でフェーズを進めます">次へ（仮）</button>
+      <button class="btn btn-dark" id="pause">一時停止</button>
+    </div>
+    <div class="host-spacer" id="host-spacer"></div>
+
+    <div class="level-bar">
+      <span class="lv" id="level"></span>
+      <span class="blinds" id="blinds"></span>
+      <span class="timer" id="timer"></span>
+    </div>
+    <div class="level-sub">
+      <span id="next-blinds"></span>
+      <span id="stack-info"></span>
+    </div>
+
+    <div class="felt-area" id="felt-area">
+      <div class="felt">
+        <div class="pot-label">POT</div>
+        <div class="pot" id="pot">$0</div>
+        <div class="phase" id="phase">WAITING</div>
+        <div class="hand-no" id="hand-no"></div>
+      </div>
+      <div id="seats"></div>
+    </div>
+
+    <div class="spectator-note" id="spectator-note" hidden>満席のため観戦中です</div>
+  </main>
+
+  <div class="action-bar" id="action-bar" hidden>
+    <div class="inner">
+      <div class="my-stack"><span class="wallet">👛</span><span id="my-stack">$0</span></div>
+      <div class="actions">
+        <button class="btn" disabled>Fold</button>
+        <button class="btn" disabled>Check</button>
+        <button class="btn" disabled>Raise</button>
+      </div>
+    </div>
+  </div>
+
+  <div class="center-message" id="not-found" hidden>
+    <h2>テーブルが見つかりません</h2>
+    <p>終了したか、URLが間違っている可能性があります。</p>
+    <a class="btn btn-blue" href="/">ロビーへ戻る</a>
+  </div>
+
+  <div class="modal-backdrop" id="name-modal" hidden>
+    <form class="modal" id="name-form">
+      <h2>名前を入力</h2>
+      <p class="hint">テーブルで表示される名前です</p>
+      <input id="name-input" type="text" maxlength="12" placeholder="例: とらのすけ" class="mt-12" autocomplete="nickname">
+      <button class="btn btn-orange btn-block mt-12" type="submit">参加する</button>
+    </form>
+  </div>
+
+  <script src="/socket.io/socket.io.js"></script>
+  <script src="/assets/common.js"></script>
+  <script src="/assets/table.js"></script>
+</body>
+</html>
diff --git a/server/auth.js b/server/auth.js
new file mode 100644
index 0000000..d4cf145
--- /dev/null
+++ b/server/auth.js
@@ -0,0 +1,214 @@
+'use strict';
+
+const crypto = require('crypto');
+const fs = require('fs');
+const net = require('net');
+const path = require('path');
+const config = require('./config');
+
+const COOKIE_NAME = 'pk_auth';
+// ブラウザの上限が400日なので、アクセスのたびに延長する（実質無期限）
+const COOKIE_MAX_AGE_SEC = 400 * 24 * 60 * 60;
+
+// Cookie 署名用の秘密値。再起動してもログイン状態が保たれるようファイルに保存する。
+// data/session-secret を削除して再起動すると、全員の入室状態を取り消せる。
+function loadSecret() {
+  if (process.env.SESSION_SECRET) return process.env.SESSION_SECRET;
+  const file = path.join(__dirname, '..', 'data', 'session-secret');
+  try {
+    const s = fs.readFileSync(file, 'utf8').trim();
+    if (s.length >= 32) return s;
+  } catch { /* 初回 */ }
+  const secret = crypto.randomBytes(32).toString('hex');
+  fs.mkdirSync(path.dirname(file), { recursive: true, mode: 0o700 });
+  fs.writeFileSync(file, secret, { mode: 0o600 });
+  return secret;
+}
+
+// 鍵を変えると既存の Cookie はすべて無効になる
+const AUTH_TOKEN = crypto
+  .createHmac('sha256', loadSecret())
+  .update('access:' + config.ACCESS_KEY)
+  .digest('base64url');
+
+function parseCookies(header) {
+  const out = {};
+  if (typeof header !== 'string') return out;
+  for (const part of header.split(';')) {
+    const i = part.indexOf('=');
+    if (i < 0) continue;
+    try {
+      out[part.slice(0, i).trim()] = decodeURIComponent(part.slice(i + 1).trim());
+    } catch { /* 不正なエンコードは無視 */ }
+  }
+  return out;
+}
+
+function safeEqual(a, b) {
+  // 長さの違いも漏らさないようハッシュ同士を比較する
+  const ha = crypto.createHash('sha256').update(String(a)).digest();
+  const hb = crypto.createHash('sha256').update(String(b)).digest();
+  return crypto.timingSafeEqual(ha, hb);
+}
+
+function isAuthedCookieHeader(cookieHeader) {
+  const value = parseCookies(cookieHeader)[COOKIE_NAME];
+  return Boolean(value) && safeEqual(value, AUTH_TOKEN);
+}
+
+function isAuthed(req) {
+  return isAuthedCookieHeader(req.headers.cookie);
+}
+
+function setAuthCookie(req, res) {
+  const parts = [
+    `${COOKIE_NAME}=${AUTH_TOKEN}`,
+    'Path=/',
+    `Max-Age=${COOKIE_MAX_AGE_SEC}`,
+    'HttpOnly',
+    'SameSite=Lax',
+  ];
+  if (req.secure) parts.push('Secure');
+  res.setHeader('Set-Cookie', parts.join('; '));
+}
+
+// ブラウザからのリクエストが同じサイト発かどうか（CSRF / Cross-Site WebSocket 対策）
+function isSameOrigin(headers) {
+  const origin = headers.origin;
+  if (!origin) return false;
+  if (config.PUBLIC_ORIGIN) return origin === config.PUBLIC_ORIGIN && isAllowedHost(headers);
+  try {
+    return new URL(origin).host === headers.host;
+  } catch {
+    return false;
+  }
+}
+
+// PUBLIC_ORIGIN 設定時は、そのドメイン宛て以外のリクエスト（IP直打ち等）を拒否する
+const PUBLIC_HOST = config.PUBLIC_ORIGIN ? new URL(config.PUBLIC_ORIGIN).host : null;
+function isAllowedHost(headers) {
+  return !PUBLIC_HOST || String(headers.host || '').toLowerCase() === PUBLIC_HOST;
+}
+
+function requireAllowedHost(req, res, next) {
+  if (isAllowedHost(req.headers)) return next();
+  res.status(421).type('text/plain').send('Misdirected Request');
+}
+
+// ---- 失敗回数制限 ----
+
+// IPv6 は1人が /64 を丸ごと持っていることが多いので /64 単位でまとめる
+function clientKey(ip) {
+  let addr = String(ip || '');
+  if (addr.startsWith('::ffff:')) addr = addr.slice(7);
+  if (net.isIPv6(addr)) {
+    const full = expandIPv6(addr);
+    return full ? full.slice(0, 4).join(':') + '::/64' : addr;
+  }
+  return addr;
+}
+
+function expandIPv6(addr) {
+  const [head, tail] = addr.split('::');
+  const h = head ? head.split(':') : [];
+  const t = tail !== undefined && tail ? tail.split(':') : [];
+  if (tail === undefined && h.length !== 8) return null;
+  const fill = new Array(8 - h.length - t.length).fill('0');
+  return [...h, ...fill, ...t];
+}
+
+class Window {
+  constructor(ms) {
+    this.ms = ms;
+    this.count = 0;
+    this.resetAt = Date.now() + ms;
+  }
+  get expired() {
+    return this.resetAt <= Date.now();
+  }
+}
+
+const perClient = new Map(); // clientKey -> Window
+let global = new Window(config.AUTH_GLOBAL_WINDOW_MS);
+
+function clientWindow(key) {
+  let w = perClient.get(key);
+  if (!w || w.expired) {
+    w = new Window(config.AUTH_FAILURE_WINDOW_MS);
+    perClient.set(key, w);
+  }
+  return w;
+}
+
+setInterval(() => {
+  for (const [k, w] of perClient) if (w.expired) perClient.delete(k);
+}, 60 * 1000).unref();
+
+function tooMany(res, w) {
+  const retryMin = Math.max(1, Math.ceil((w.resetAt - Date.now()) / 60000));
+  res.setHeader('Retry-After', String(retryMin * 60));
+  return res.status(429).json({ error: `試行回数が多すぎます。${retryMin}分後に再度お試しください。` });
+}
+
+function handleLogin(req, res) {
+  if (!isSameOrigin(req.headers)) return res.status(403).json({ error: 'forbidden' });
+
+  const key = clientKey(req.ip);
+  const w = clientWindow(key);
+  if (global.expired) global = new Window(config.AUTH_GLOBAL_WINDOW_MS);
+  if (w.count >= config.AUTH_MAX_FAILURES) return tooMany(res, w);
+  if (global.count >= config.AUTH_GLOBAL_MAX_FAILURES) return tooMany(res, global);
+
+  const input = typeof (req.body && req.body.key) === 'string' ? req.body.key.trim() : '';
+  if (!/^\d{6}$/.test(input)) {
+    return res.status(400).json({ error: '6桁の数字を入力してください。' });
+  }
+  if (!safeEqual(input, config.ACCESS_KEY)) {
+    w.count++;
+    global.count++;
+    console.warn(`[auth] 鍵の入力ミス from ${key} (${w.count}/${config.AUTH_MAX_FAILURES}, 全体 ${global.count}/${config.AUTH_GLOBAL_MAX_FAILURES})`);
+    if (global.count === config.AUTH_GLOBAL_MAX_FAILURES) {
+      console.warn('[auth] 全体の失敗回数が上限に達したため、新規の鍵入力を一時停止します');
+    }
+    const left = config.AUTH_MAX_FAILURES - w.count;
+    return res.status(401).json({ error: left > 0 ? `鍵が違います。（あと${left}回）` : '鍵が違います。' });
+  }
+  perClient.delete(key);
+  console.log(`[auth] 入室 from ${key}`);
+  setAuthCookie(req, res);
+  res.json({ ok: true });
+}
+
+// /key 以外のページ・API を保護する
+function requireAuth(req, res, next) {
+  if (isAuthed(req)) {
+    if (req.method === 'GET' && !req.path.startsWith('/api/')) setAuthCookie(req, res);
+    return next();
+  }
+  if (req.path.startsWith('/api/')) return res.status(401).json({ error: 'unauthorized' });
+  if (req.method === 'GET') return res.redirect('/key?next=' + encodeURIComponent(req.originalUrl));
+  res.status(401).end();
+}
+
+// 状態を変える API は同じサイトからのみ受け付ける
+function requireSameOrigin(req, res, next) {
+  if (req.method === 'GET' || req.method === 'HEAD' || isSameOrigin(req.headers)) return next();
+  res.status(403).json({ error: 'forbidden' });
+}
+
+// オープンリダイレクト防止: 自サイト内の通常のパスだけ許可（"//x" や "/\x" は外部扱いされるので拒否）
+function safeNext(next) {
+  return typeof next === 'string' && /^\/(?![/\\])[^\\\s]*$/.test(next) && next.length <= 200 ? next : '/';
+}
+
+module.exports = {
+  isAuthed,
+  isAuthedCookieHeader,
+  isSameOrigin,
+  isAllowedHost,
+  requireAllowedHost,
+  handleLogin,
+  requireAuth,
+  requireSameOrigin,
+  safeNext,
+};
diff --git a/server/config.js b/server/config.js
new file mode 100644
index 0000000..c3fe7cd
--- /dev/null
+++ b/server/config.js
@@ -0,0 +1,67 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+
+// プロジェクト直下の .env を読み込む（既存の環境変数は上書きしない）。
+// 秘密情報はソースコードに書かず .env（git 管理外）か環境変数で渡す。
+function loadDotEnv(file) {
+  let text;
+  try {
+    text = fs.readFileSync(file, 'utf8');
+  } catch {
+    return;
+  }
+  if (process.platform !== 'win32' && (fs.statSync(file).mode & 0o077) !== 0) {
+    console.warn(`[config] ${file} が他ユーザーから読める状態です。chmod 600 してください。`);
+  }
+  for (const line of text.split(/\r?\n/)) {
+    const m = line.match(/^\s*([A-Z_][A-Z0-9_]*)\s*=\s*(.*?)\s*$/);
+    if (!m || line.trim().startsWith('#')) continue;
+    const value = m[2].replace(/^(['"])(.*)\1$/, '$2');
+    if (process.env[m[1]] === undefined) process.env[m[1]] = value;
+  }
+}
+loadDotEnv(path.join(__dirname, '..', '.env'));
+
+const ACCESS_KEY = process.env.ACCESS_KEY;
+if (!ACCESS_KEY || !/^\d{6}$/.test(ACCESS_KEY)) {
+  console.error('[config] ACCESS_KEY（6桁の数字）が未設定です。.env か環境変数で指定してください。');
+  process.exit(1);
+}
+
+module.exports = {
+  PORT: Number(process.env.PORT) || 4671,
+
+  // 既定では自分自身(127.0.0.1)でのみ待ち受け、外部には nginx 等の HTTPS 経由で公開する。
+  // どうしても直接公開する場合のみ HOST=0.0.0.0 にする（通信が平文になるので非推奨）。
+  HOST: process.env.HOST || '127.0.0.1',
+
+  // 公開URL（例: https://poker.kanawo.net）。設定するとこのドメイン以外からのアクセスを拒否する。
+  // ローカル開発時は未設定のままにする。
+  PUBLIC_ORIGIN: process.env.PUBLIC_ORIGIN ? new URL(process.env.PUBLIC_ORIGIN).origin : null,
+
+  // 参加キー（6桁の数字）。.env の ACCESS_KEY
+  ACCESS_KEY,
+
+  // 1テーブルの最大着席数
+  MAX_SEATS: 9,
+
+  // 同時に存在できるテーブル数の上限
+  MAX_TABLES: 30,
+
+  // 誰も接続していないテーブルを削除するまでの時間
+  EMPTY_TABLE_TTL_MS: 30 * 60 * 1000,
+
+  // 鍵入力のブルートフォース対策
+  // IP（IPv6 は /64 単位）ごと: WINDOW 内で MAX_FAILURES 回まで
+  AUTH_MAX_FAILURES: 5,
+  AUTH_FAILURE_WINDOW_MS: 30 * 60 * 1000,
+  // サーバ全体: 1時間に GLOBAL_MAX_FAILURES 回失敗したら新規の鍵入力を一時停止
+  // （入室済みの人は Cookie があるので影響なし）
+  AUTH_GLOBAL_MAX_FAILURES: 30,
+  AUTH_GLOBAL_WINDOW_MS: 60 * 60 * 1000,
+
+  // Socket.IO のイベント数上限（1接続あたり / 秒）
+  SOCKET_EVENTS_PER_SEC: 10,
+};
diff --git a/server/index.js b/server/index.js
new file mode 100644
index 0000000..b4f7f06
--- /dev/null
+++ b/server/index.js
@@ -0,0 +1,274 @@
+'use strict';
+
+const path = require('path');
+const http = require('http');
+const express = require('express');
+const { Server } = require('socket.io');
+const config = require('./config');
+const auth = require('./auth');
+const { TableManager } = require('./tables');
+
+const PUBLIC = path.join(__dirname, '..', 'public');
+const page = (file) => (req, res) => res.sendFile(path.join(PUBLIC, file));
+
+const app = express();
+app.set('trust proxy', 'loopback'); // nginx 等のリバースプロキシ越しでも req.ip / req.secure を正しく
+app.disable('x-powered-by');
+
+app.use(auth.requireAllowedHost);
+
+// ---------- セキュリティヘッダ ----------
+const CSP = [
+  "default-src 'self'",
+  "script-src 'self'",
+  "style-src 'self'",
+  "img-src 'self' data:",
+  "connect-src 'self'",
+  "font-src 'self'",
+  "object-src 'none'",
+  "base-uri 'none'",
+  "form-action 'self'",
+  "frame-ancestors 'none'",
+].join('; ');
+
+app.use((req, res, next) => {
+  res.setHeader('Content-Security-Policy', CSP);
+  res.setHeader('X-Content-Type-Options', 'nosniff');
+  res.setHeader('X-Frame-Options', 'DENY');
+  res.setHeader('Referrer-Policy', 'no-referrer');
+  res.setHeader('Cross-Origin-Opener-Policy', 'same-origin');
+  res.setHeader('Cross-Origin-Resource-Policy', 'same-origin');
+  res.setHeader('Permissions-Policy', 'camera=(), microphone=(), geolocation=(), payment=()');
+  res.setHeader('X-Robots-Tag', 'noindex, nofollow');
+  if (req.secure) res.setHeader('Strict-Transport-Security', 'max-age=31536000');
+  // HTML と API はキャッシュさせない（共有端末やプロキシに残さない）
+  if (!req.path.startsWith('/assets/')) res.setHeader('Cache-Control', 'no-store');
+  next();
+});
+
+app.use(express.json({ limit: '4kb', strict: true }));
+
+const server = http.createServer(app);
+server.headersTimeout = 20 * 1000;
+server.requestTimeout = 30 * 1000;
+
+const io = new Server(server, {
+  // WebSocket のみ（ハンドシェイクに必ず Origin が付くので Cross-Site WebSocket を確実に弾ける）
+  transports: ['websocket'],
+  maxHttpBufferSize: 4 * 1024,
+  allowRequest: (req, callback) => {
+    callback(
+      null,
+      auth.isAllowedHost(req.headers) && auth.isSameOrigin(req.headers) && auth.isAuthedCookieHeader(req.headers.cookie)
+    );
+  },
+});
+const tables = new TableManager();
+
+// ---------- 認証不要 ----------
+app.use('/assets', express.static(path.join(PUBLIC, 'assets'), { index: false, dotfiles: 'deny' }));
+app.get('/robots.txt', (req, res) => res.type('text/plain').send('User-agent: *\nDisallow: /\n'));
+app.get('/key', (req, res) => {
+  if (auth.isAuthed(req)) return res.redirect(auth.safeNext(req.query.next));
+  page('key.html')(req, res);
+});
+app.post('/api/auth', auth.handleLogin);
+
+// ---------- ここから先は鍵が必要 ----------
+app.use(auth.requireAuth);
+app.use(auth.requireSameOrigin);
+
+app.get('/', page('lobby.html'));
+app.get('/create', page('create.html'));
+app.get('/table/:id', page('table.html'));
+
+app.get('/api/tables', (req, res) => res.json(tables.list()));
+app.get('/api/tables/suggest-name', (req, res) => res.json({ name: tables.suggestName() }));
+
+const intIn = (v, min, max) => Number.isInteger(v) && v >= min && v <= max;
+
+app.post('/api/tables', (req, res) => {
+  const b = req.body && typeof req.body === 'object' ? req.body : {};
+  const name = cleanText(b.name, 24);
+  const startingStack = b.startingStack;
+  const smallBlind = b.smallBlind;
+  const bigBlind = b.bigBlind;
+  const blindTimerEnabled = b.blindTimerEnabled === true;
+  const blindIntervalMin = b.blindIntervalMin;
+  const hostToken = cleanToken(b.token);
+
+  if (tables.tables.size >= config.MAX_TABLES) return res.status(429).json({ error: 'テーブル数が上限に達しています' });
+  if (!name) return res.status(400).json({ error: 'テーブル名は1〜24文字で入力してください' });
+  if (tables.nameTaken(name)) return res.status(409).json({ error: '同じ名前のテーブルがすでにあります' });
+  if (!intIn(startingStack, 10, 100000000)) return res.status(400).json({ error: '開始スタックが不正です' });
+  if (!intIn(smallBlind, 1, startingStack)) return res.status(400).json({ error: 'SBが不正です' });
+  if (!intIn(bigBlind, smallBlind, startingStack)) return res.status(400).json({ error: 'BBはSB以上・開始スタック以下にしてください' });
+  if (blindTimerEnabled && !intIn(blindIntervalMin, 1, 240)) return res.status(400).json({ error: 'インターバルは1〜240分で入力してください' });
+  if (!hostToken) return res.status(400).json({ error: 'プレイヤーIDがありません' });
+
+  const table = tables.create({
+    name,
+    startingStack,
+    smallBlind,
+    bigBlind,
+    blindTimerEnabled,
+    blindIntervalMin: blindTimerEnabled ? blindIntervalMin : 10,
+    hostToken,
+  });
+  broadcastLobby();
+  res.json({ id: table.id });
+});
+
+app.use((req, res) => res.status(404).type('text/plain').send('Not Found'));
+
+// 内部情報（スタックトレース等）を返さない
+app.use((err, req, res, _next) => {
+  const status = err.status || err.statusCode || 500;
+  if (status >= 500) console.error(err);
+  res.status(status).json({ error: status >= 500 ? 'サーバエラー' : '不正なリクエストです' });
+});
+
+// ---------- 入力の正規化 ----------
+
+function cleanToken(t) {
+  return typeof t === 'string' && /^[0-9a-f]{32}$/.test(t) ? t : null;
+}
+
+// 制御文字・不可視文字（方向制御など）を除き、空白をまとめて文字数で切る
+function cleanText(s, max) {
+  if (typeof s !== 'string') return '';
+  const chars = Array.from(s.replace(/[\p{Cc}\p{Cf}\p{Co}\p{Cn}\p{Zl}\p{Zp}]/gu, '').replace(/\s+/g, ' ').trim());
+  return chars.slice(0, max).join('').trim();
+}
+
+// ---------- Socket.IO ----------
+
+const roomOf = (id) => 'table:' + id;
+
+function roomSockets(tableId) {
+  const ids = io.sockets.adapter.rooms.get(roomOf(tableId));
+  return ids ? [...ids].map((id) => io.sockets.sockets.get(id)).filter(Boolean) : [];
+}
+
+function broadcastTable(table) {
+  const sockets = roomSockets(table.id);
+  const connected = new Set(sockets.map((s) => s.data.token));
+  for (const s of sockets) s.emit('table:state', table.publicState(s.data.token, connected));
+}
+
+function broadcastLobby() {
+  io.to('lobby').emit('lobby:tables', tables.list());
+}
+
+function changed(table) {
+  broadcastTable(table);
+  broadcastLobby();
+}
+
+// 二重チェック（allowRequest を通った後も念のため）
+io.use((socket, next) => {
+  if (auth.isAuthedCookieHeader(socket.handshake.headers.cookie)) next();
+  else next(new Error('unauthorized'));
+});
+
+io.on('connection', (socket) => {
+  const reply = (ack, payload) => typeof ack === 'function' && ack(payload);
+
+  // イベントの連打を制限
+  let windowStart = Date.now();
+  let count = 0;
+  socket.use((_packet, next) => {
+    const now = Date.now();
+    if (now - windowStart >= 1000) {
+      windowStart = now;
+      count = 0;
+    }
+    if (++count > config.SOCKET_EVENTS_PER_SEC) return socket.disconnect(true);
+    next();
+  });
+
+  socket.on('lobby:subscribe', () => {
+    socket.join('lobby');
+    socket.emit('lobby:tables', tables.list());
+  });
+
+  socket.on('table:join', (p, ack) => {
+    if (!p || typeof p !== 'object') return reply(ack, { ok: false, error: 'BAD_REQUEST' });
+    const table = typeof p.tableId === 'string' && tables.get(p.tableId);
+    if (!table) return reply(ack, { ok: false, error: 'NOT_FOUND' });
+    const token = cleanToken(p.token);
+    const name = cleanText(p.name, 12);
+    if (!token) return reply(ack, { ok: false, error: 'BAD_TOKEN' });
+    if (!name) return reply(ack, { ok: false, error: 'NAME_REQUIRED' });
+
+    const prev = socket.data.tableId && tables.get(socket.data.tableId);
+    if (prev && prev !== table) {
+      socket.leave(roomOf(prev.id));
+      broadcastTable(prev);
+    }
+    socket.data.token = token;
+    socket.data.tableId = table.id;
+    socket.join(roomOf(table.id));
+    table.emptySince = null;
+
+    const seat = table.join(token, name);
+    reply(ack, { ok: true, seat });
+    changed(table);
+  });
+
+  // ホスト操作・退席は同じ形で処理する
+  const actions = {
+    'table:leave': (t, token) => (t.leave(token) ? null : '着席していません'),
+    'table:start': (t, token) => t.start(token),
+    'table:nextPhase': (t, token) => t.nextPhase(token),
+    'table:pause': (t, token) => t.togglePause(token),
+  };
+  for (const [event, fn] of Object.entries(actions)) {
+    socket.on(event, (_p, ack) => {
+      const table = socket.data.tableId && tables.get(socket.data.tableId);
+      if (!table) return reply(ack, { ok: false, error: 'NOT_FOUND' });
+      const error = fn(table, socket.data.token);
+      reply(ack, error ? { ok: false, error } : { ok: true });
+      if (!error) changed(table);
+    });
+  }
+
+  socket.on('disconnect', () => {
+    const table = socket.data.tableId && tables.get(socket.data.tableId);
+    if (table) broadcastTable(table); // 接続中表示を更新
+  });
+});
+
+// ブラインドタイマー
+setInterval(() => {
+  const now = Date.now();
+  for (const table of tables.tables.values()) {
+    if (table.tick(now)) changed(table);
+  }
+}, 1000);
+
+// 誰も見ていないテーブルを片付ける
+setInterval(() => {
+  const now = Date.now();
+  let removed = false;
+  for (const table of [...tables.tables.values()]) {
+    if (roomSockets(table.id).length > 0) {
+      table.emptySince = null;
+      continue;
+    }
+    if (table.emptySince == null) table.emptySince = now;
+    if (now - table.emptySince > config.EMPTY_TABLE_TTL_MS) {
+      tables.delete(table.id);
+      removed = true;
+    }
+  }
+  if (removed) broadcastLobby();
+}, 60 * 1000);
+
+server.listen(config.PORT, config.HOST, () => {
+  console.log(`Poker server listening on http://${config.HOST}:${config.PORT}`);
+  if (config.PUBLIC_ORIGIN) console.log(`[config] 公開URL: ${config.PUBLIC_ORIGIN}（他のホスト名は拒否）`);
+  if (config.HOST !== '127.0.0.1' && config.HOST !== '::1') {
+    console.warn('[config] 外部から直接アクセスできる設定です。HTTPS のリバースプロキシ経由での公開を推奨します。');
+  }
+});
diff --git a/server/tables.js b/server/tables.js
new file mode 100644
index 0000000..c4c9822
--- /dev/null
+++ b/server/tables.js
@@ -0,0 +1,271 @@
+'use strict';
+
+const crypto = require('crypto');
+const config = require('./config');
+const Blinds = require('../public/assets/blinds');
+
+// 進行フェーズ。プレイ処理は未実装なので、ホストが手動で進めるスタブ。
+const HAND_PHASES = ['PREFLOP', 'FLOP', 'TURN', 'RIVER', 'SHOWDOWN'];
+
+class Table {
+  constructor(opts) {
+    this.id = opts.id;
+    this.name = opts.name;
+    this.startingStack = opts.startingStack;
+    this.baseSmallBlind = opts.smallBlind;
+    this.baseBigBlind = opts.bigBlind;
+    this.timerEnabled = opts.blindTimerEnabled;
+    this.intervalMin = opts.blindIntervalMin;
+    this.hostToken = opts.hostToken || null;
+    this.maxSeats = config.MAX_SEATS;
+
+    this.seats = new Array(this.maxSeats).fill(null); // { token, name, stack }
+    this.phase = 'WAITING';
+    this.started = false;
+    this.paused = false;
+    this.level = 1;
+    this.handNumber = 0;
+    this.pot = 0;
+    this.buttonSeat = null;
+    this.levelEndsAt = null;
+    this.levelRemainingMs = this.intervalMs;
+
+    this.createdAt = Date.now();
+    this.emptySince = null;
+  }
+
+  get intervalMs() {
+    return this.intervalMin * 60 * 1000;
+  }
+
+  get blinds() {
+    return Blinds.blindsAt(this.baseSmallBlind, this.baseBigBlind, this.level);
+  }
+
+  get playerCount() {
+    return this.seats.filter(Boolean).length;
+  }
+
+  seatOf(token) {
+    return this.seats.findIndex((s) => s && s.token === token);
+  }
+
+  isHost(token) {
+    return Boolean(token) && token === this.hostToken;
+  }
+
+  // 着席した席番号を返す。満席なら -1（観戦）
+  join(token, name) {
+    const existing = this.seatOf(token);
+    if (existing >= 0) {
+      this.seats[existing].name = name;
+      return existing;
+    }
+    const free = this.seats.findIndex((s) => !s);
+    if (free < 0) return -1;
+    this.seats[free] = { token, name, stack: this.startingStack };
+    // ホスト（通常は作成者）が着席していなければ、この人がホストになる
+    if (this.seatOf(this.hostToken) < 0) this.hostToken = token;
+    return free;
+  }
+
+  leave(token) {
+    const i = this.seatOf(token);
+    if (i < 0) return false;
+    this.seats[i] = null;
+    if (this.hostToken === token) {
+      const next = this.seats.find(Boolean);
+      this.hostToken = next ? next.token : null;
+    }
+    if (this.playerCount < 2 && this.phase !== 'WAITING') {
+      this.phase = 'WAITING';
+    }
+    return true;
+  }
+
+  // 次に埋まっている席（時計回り = 席番号の昇順）
+  nextOccupied(from) {
+    for (let k = 1; k <= this.maxSeats; k++) {
+      const i = (from + k) % this.maxSeats;
+      if (this.seats[i]) return i;
+    }
+    return null;
+  }
+
+  blindSeats() {
+    if (this.buttonSeat == null || this.phase === 'WAITING' || this.playerCount < 2) {
+      return { sbSeat: null, bbSeat: null };
+    }
+    let sbSeat;
+    if (this.playerCount === 2 && this.seats[this.buttonSeat]) {
+      sbSeat = this.buttonSeat; // ヘッズアップはボタンがSB
+    } else {
+      sbSeat = this.nextOccupied(this.buttonSeat);
+    }
+    return { sbSeat, bbSeat: this.nextOccupied(sbSeat) };
+  }
+
+  startNewHand() {
+    const occupied = this.seats.map((s, i) => (s ? i : -1)).filter((i) => i >= 0);
+    this.buttonSeat =
+      this.buttonSeat == null
+        ? occupied[Math.floor(Math.random() * occupied.length)]
+        : this.nextOccupied(this.buttonSeat);
+    this.handNumber++;
+    this.pot = 0;
+    this.phase = 'PREFLOP';
+  }
+
+  // ---- ホスト操作（エラー時はメッセージを返す） ----
+
+  start(token) {
+    if (!this.isHost(token)) return 'ホストのみ開始できます';
+    if (this.phase !== 'WAITING') return 'すでに進行中です';
+    if (this.playerCount < 2) return '2人以上必要です';
+    if (!this.started) {
+      this.started = true;
+      if (this.timerEnabled) this.levelEndsAt = Date.now() + this.intervalMs;
+    }
+    this.startNewHand();
+    return null;
+  }
+
+  // スタブ: フェーズを1つ進める（SHOWDOWN の次は新しいハンド）
+  nextPhase(token) {
+    if (!this.isHost(token)) return 'ホストのみ操作できます';
+    if (this.phase === 'WAITING') return 'まだ開始していません';
+    if (this.playerCount < 2) return '2人以上必要です';
+    const i = HAND_PHASES.indexOf(this.phase);
+    if (i === HAND_PHASES.length - 1) this.startNewHand();
+    else this.phase = HAND_PHASES[i + 1];
+    return null;
+  }
+
+  togglePause(token) {
+    if (!this.isHost(token)) return 'ホストのみ操作できます';
+    if (!this.started) return 'まだ開始していません';
+    const now = Date.now();
+    if (this.paused) {
+      this.paused = false;
+      if (this.timerEnabled) this.levelEndsAt = now + this.levelRemainingMs;
+    } else {
+      this.paused = true;
+      if (this.timerEnabled) {
+        this.levelRemainingMs = Math.max(0, this.levelEndsAt - now);
+        this.levelEndsAt = null;
+      }
+    }
+    return null;
+  }
+
+  // ブラインドタイマー。レベルが上がったら true
+  tick(now) {
+    let changed = false;
+    while (this.levelEndsAt != null && now >= this.levelEndsAt) {
+      this.level++;
+      this.levelEndsAt += this.intervalMs;
+      changed = true;
+    }
+    return changed;
+  }
+
+  summary() {
+    const { sb, bb } = this.blinds;
+    return {
+      id: this.id,
+      name: this.name,
+      playerCount: this.playerCount,
+      maxSeats: this.maxSeats,
+      startingStack: this.startingStack,
+      smallBlind: sb,
+      bigBlind: bb,
+      level: this.level,
+      phase: this.phase,
+      paused: this.paused,
+      timerEnabled: this.timerEnabled,
+      intervalMin: this.intervalMin,
+      createdAt: this.createdAt,
+    };
+  }
+
+  // token = 閲覧者のトークン（他人のトークンは送らない）
+  publicState(token, connectedTokens) {
+    const { sb, bb } = this.blinds;
+    const next = Blinds.blindsAt(this.baseSmallBlind, this.baseBigBlind, this.level + 1);
+    const host = this.seatOf(this.hostToken);
+    return {
+      id: this.id,
+      name: this.name,
+      startingStack: this.startingStack,
+      maxSeats: this.maxSeats,
+      level: this.level,
+      smallBlind: sb,
+      bigBlind: bb,
+      nextBlinds: { smallBlind: next.sb, bigBlind: next.bb },
+      timer: {
+        enabled: this.timerEnabled,
+        intervalMin: this.intervalMin,
+        endsAt: this.levelEndsAt,
+        remainingMs: this.levelEndsAt != null ? this.levelEndsAt - Date.now() : this.levelRemainingMs,
+        running: this.levelEndsAt != null,
+      },
+      phase: this.phase,
+      started: this.started,
+      paused: this.paused,
+      pot: this.pot,
+      handNumber: this.handNumber,
+      buttonSeat: this.phase === 'WAITING' ? null : this.buttonSeat,
+      ...this.blindSeats(),
+      hostSeat: host >= 0 ? host : null,
+      seats: this.seats.map((s, i) =>
+        s ? { seat: i, name: s.name, stack: s.stack, connected: connectedTokens.has(s.token) } : null
+      ),
+      mySeat: this.seatOf(token),
+      isHost: this.isHost(token),
+      serverNow: Date.now(),
+    };
+  }
+}
+
+class TableManager {
+  constructor() {
+    this.tables = new Map();
+  }
+
+  get(id) {
+    return this.tables.get(id);
+  }
+
+  list() {
+    return [...this.tables.values()]
+      .sort((a, b) => b.createdAt - a.createdAt)
+      .map((t) => t.summary());
+  }
+
+  nameTaken(name) {
+    const n = name.toLowerCase();
+    return [...this.tables.values()].some((t) => t.name.toLowerCase() === n);
+  }
+
+  suggestName() {
+    for (;;) {
+      const name = `Table #${1000 + crypto.randomInt(9000)}`;
+      if (!this.nameTaken(name)) return name;
+    }
+  }
+
+  create(opts) {
+    let id;
+    do id = crypto.randomBytes(4).toString('hex');
+    while (this.tables.has(id));
+    const table = new Table({ ...opts, id });
+    this.tables.set(id, table);
+    return table;
+  }
+
+  delete(id) {
+    this.tables.delete(id);
+  }
+}
+
+module.exports = { TableManager };