diff --git a/.firebaserc.example b/.firebaserc.example
new file mode 100644
index 0000000..faf24c2
--- /dev/null
+++ b/.firebaserc.example
@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "REPLACE_WITH_NEW_FIREBASE_PROJECT_ID"
+  }
+}
diff --git a/.gitignore b/.gitignore
index 5ef6a52..5cdaf11 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,7 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+# secrets
+serviceAccount.json
+.firebaserc
diff --git a/docs/BACKEND.md b/docs/BACKEND.md
new file mode 100644
index 0000000..c53de61
--- /dev/null
+++ b/docs/BACKEND.md
@@ -0,0 +1,121 @@
+# TriplePick — Backend Readiness Pack
+
+작성일: 2026-06-08 KST
+짝 문서: `../../Worldcup 2026/000. Plan/Landing 기능정의서 — TriplePick 2026.md` (데이터모델 §3 / 채점 §5 원본)
+이 문서 = 백엔드 즉시 착수용 종합. 실파일(rules·indexes·env·seed)은 레포 루트에 동봉.
+
+---
+
+## 0. 확정 결정 (2026-06-08)
+- **Firebase = 사용자가 새 프로젝트 직접 생성** → config 6키·서비스계정 추후 제공
+- **상금 챌린지(약관) = R2로 연기** → R1 백엔드는 픽 저장·채점·Crowd·이메일 알림까지만. `event_participation` 로직 보류
+- **결과 알림 = 이메일(Resend)**
+
+## 1. R1 백엔드 범위 (이번에 만들 것)
+1. 픽 제출 저장 (검증·중복방지·마감) — 콜러블 함수 `submitPrediction`
+2. 군중 분포 원자적 증분 — `crowd_stats` 트랜잭션
+3. 경기 결과 입력(관리자) → **자동 채점** + **결과 이메일 발송**
+4. 결과 알림 구독 `subscribeResult`
+5. 공개 읽기(경기·AI예측·Crowd)는 클라이언트 Firestore 직접 read
+- **R2 이후**: 리더보드, event_participation(상금), 웹푸시, 영어판
+
+## 2. 아키텍처
+```
+Next.js (Vercel)  ──read──>  Firestore (공개: matches/ai_predictions/crowd_stats)
+       │
+       └─ callable ──>  Cloud Functions (asia-northeast3)
+                          ├ submitPrediction  (검증+crowd 증분+user_predictions 쓰기)
+                          ├ updatePrediction  (마감 전 1회 수정)
+                          ├ subscribeResult   (notify_subscriptions)
+                          ├ admin HTTP: upsertMatch / upsertAIPrediction / setResult (Bearer ADMIN_API_TOKEN)
+                          └ onResultSet 트리거 → scoreAll + Resend 발송
+```
+- 클라이언트는 `user_predictions`에 **직접 쓰지 않음** (PII·crowd 원자성 때문). 모두 함수 경유.
+- 본인 픽 재방문 표시는 **localStorage 캐시**로 처리(서버 read 불필요).
+
+## 3. API 계약
+
+### 3.1 submitPrediction (callable)
+요청:
+```json
+{ "matchId":"A_KOR_CZE_20260612","deviceId":"uuid","outcome":"TEAM_A_WIN",
+  "scoreA":2,"scoreB":1,"nickname":"민준","email":"opt@x.com","notify":true,
+  "source":"youtube_shorts","utm":{"source":"youtube","campaign":"kor_cze_ai_prediction"} }
+```
+응답:
+```json
+{ "ok":true,"predictionId":"A_KOR_CZE_20260612_uuid","matchedModels":["GPT"],
+  "exactMatch":false,"crowd":{"total":1285,"teamAWin":616,"draw":347,"teamBWin":322} }
+```
+검증/에러: `MATCH_NOT_FOUND` · `MATCH_LOCKED`(now ≥ lockAt) · `INVALID_OUTCOME` · `INVALID_SCORE`(0–9 int) · `NICKNAME_INVALID`(2–16자·금칙어) · `ALREADY_SUBMITTED`(→ updatePrediction 안내)
+처리: 트랜잭션으로 ① docId=`matchId_deviceId` 없으면 create ② crowd_stats 증분 ③ matchedModels 계산.
+
+### 3.2 updatePrediction (callable)
+- 마감 전 1회 수정. 이전 outcome→새 outcome 변경 시 crowd 분포 보정.
+
+### 3.3 subscribeResult (callable)
+- `{matchId, deviceId, email}` → `notify_subscriptions/{matchId_deviceId}` upsert(`notified:false`).
+
+### 3.4 관리자 (HTTP, `Authorization: Bearer <ADMIN_API_TOKEN>`)
+- `POST /admin/upsertMatch` — 경기 등록/수정
+- `POST /admin/upsertAIPrediction` — 모델 예측 입력/수정
+- `POST /admin/setResult` — `{matchId, scoreA, scoreB}` → matches.result 기록 + status=finished (→ onResultSet 트리거)
+
+### 3.5 onResultSet (Firestore 트리거)
+- matches.result 세팅 시: 해당 경기 user_predictions 전수 채점(§아래) → `points`/`scoredAt` 기록 → notify_subscriptions 조회 → Resend로 "AI 이겼나" 결과 메일 발송 → `notified:true`.
+
+## 4. 채점 (기능정의서 §5)
+```
+pts = 0
+if outcome == result.outcome: pts += 3
+if scoreA==result.scoreA && scoreB==result.scoreB: pts += 5
+if (scoreA-scoreB) == (result.scoreA-result.scoreB): pts += 1
+```
+동점자: 정확스코어 적중수 → 총 참여수(R2) → 최초 제출시각.
+
+## 5. 데이터 모델
+- 원본: 기능정의서 §3 + `lib/types.ts`. 시드: `scripts/seed.mjs` (matches 6 + ai_predictions + crowd_stats 0 초기화).
+- 신규 R1 필드: user_predictions에 `points:number|null`, `scoredAt:ts|null`. notify_subscriptions `{matchId,deviceId,email,notified,createdAt}`.
+
+## 6. 보안 (firestore.rules)
+- 공개 read / 클라 write 차단: matches·ai_predictions·crowd_stats
+- 전면 차단(함수 전용): user_predictions·notify_subscriptions·event_participation
+- 어뷰징: **App Check 권장**(콜러블에 enforce), 함수 내 deviceId rate-limit, nickname 금칙어.
+
+## 7. 알림 (Resend)
+- 키 `RESEND_API_KEY`, 발신 `RESEND_FROM`. onResultSet에서 구독자에 발송.
+- 메일 내용: 경기 결과 + 내 픽 적중 여부 + AI 3모델 적중 여부 + 랜딩 재방문 CTA(다음 경기).
+
+## 8. 환경 변수
+`.env.example` 참조. 클라 6키(NEXT_PUBLIC_*) + 서버(RESEND_API_KEY, RESEND_FROM, ADMIN_API_TOKEN) + 시드(GOOGLE_APPLICATION_CREDENTIALS).
+
+## 9. 배포 절차
+```
+firebase login
+cp .firebaserc.example .firebaserc   # projectId 기입
+firebase deploy --only firestore:rules,firestore:indexes
+GOOGLE_APPLICATION_CREDENTIALS=./serviceAccount.json node scripts/seed.mjs
+cd functions && npm i && firebase deploy --only functions
+# 프론트는 Vercel 자동 배포 (env에 NEXT_PUBLIC_* 추가)
+```
+프론트 전환: `lib/mockData.ts` 읽기 → `lib/firebase.ts`+Firestore read, `Arena.confirmSubmit` mock → `submitPrediction` 콜러블.
+
+## 10. 테스트 체크리스트
+- [ ] 마감(lockAt) 전/후 제출 — 후엔 423/MATCH_LOCKED
+- [ ] 동일 deviceId 재제출 → update 경로, crowd 중복증가 없음
+- [ ] crowd 증분 동시성(트랜잭션) — 병렬 제출 시 합계 일치
+- [ ] 금칙어/길이 닉네임 거절
+- [ ] setResult → 채점 정확(3/+5/+1) + 메일 발송 + notified 갱신
+- [ ] 보안규칙: 클라가 user_predictions read/write 시도 → 거부
+- [ ] App Check 미통과 호출 차단
+- [ ] env 누락 시 명확한 에러(조용한 실패 0)
+
+## 11. 아직 사용자에게 필요한 것 (착수 차단/부분차단)
+- 🔴 **새 Firebase 프로젝트 config 6키 + 서비스계정 JSON** (생성 후)
+- 🔴 **Resend API Key + 발신 도메인**
+- 🟠 **ADMIN_API_TOKEN** 값 지정(임의 강한 토큰)
+- 🟡 **상금 약관(D5)** — R2 event_participation 착수 시 필요(지금은 불필요)
+- 🟡 도메인(D1) — 미정 시 Vercel 기본 URL 사용
+
+## 12. 함수 폴더(미생성, 다음 세션)
+`functions/` (TypeScript, firebase-functions v2) — onCall/onRequest/onDocumentWritten. 다음 세션에서 `firebase init functions`로 생성 후 위 계약대로 구현.
diff --git a/firebase.json b/firebase.json
new file mode 100644
index 0000000..4551352
--- /dev/null
+++ b/firebase.json
@@ -0,0 +1,11 @@
+{
+  "firestore": {
+    "rules": "firestore.rules",
+    "indexes": "firestore.indexes.json"
+  },
+  "functions": {
+    "source": "functions",
+    "runtime": "nodejs20",
+    "region": "asia-northeast3"
+  }
+}
diff --git a/firestore.indexes.json b/firestore.indexes.json
new file mode 100644
index 0000000..f1521c8
--- /dev/null
+++ b/firestore.indexes.json
@@ -0,0 +1,43 @@
+{
+  "indexes": [
+    {
+      "_comment": "리더보드(R2): 경기별 점수 내림차순 + 동점자 정렬(정확스코어 적중수, 제출시각)",
+      "collectionGroup": "user_predictions",
+      "queryScope": "COLLECTION",
+      "fields": [
+        { "fieldPath": "matchId", "order": "ASCENDING" },
+        { "fieldPath": "points", "order": "DESCENDING" },
+        { "fieldPath": "createdAt", "order": "ASCENDING" }
+      ]
+    },
+    {
+      "_comment": "결과 채점 트리거: 경기별 미채점 예측 조회",
+      "collectionGroup": "user_predictions",
+      "queryScope": "COLLECTION",
+      "fields": [
+        { "fieldPath": "matchId", "order": "ASCENDING" },
+        { "fieldPath": "scoredAt", "order": "ASCENDING" }
+      ]
+    },
+    {
+      "_comment": "결과 알림 발송: 경기별 알림 동의 구독자 조회",
+      "collectionGroup": "notify_subscriptions",
+      "queryScope": "COLLECTION",
+      "fields": [
+        { "fieldPath": "matchId", "order": "ASCENDING" },
+        { "fieldPath": "notified", "order": "ASCENDING" }
+      ]
+    },
+    {
+      "_comment": "참여 횟수 랭킹(R2): 상금 챌린지 후보군",
+      "collectionGroup": "event_participation",
+      "queryScope": "COLLECTION",
+      "fields": [
+        { "fieldPath": "isCandidate", "order": "ASCENDING" },
+        { "fieldPath": "totalPredictions", "order": "DESCENDING" },
+        { "fieldPath": "currentPoints", "order": "DESCENDING" }
+      ]
+    }
+  ],
+  "fieldOverrides": []
+}
diff --git a/firestore.rules b/firestore.rules
new file mode 100644
index 0000000..7c978fb
--- /dev/null
+++ b/firestore.rules
@@ -0,0 +1,43 @@
+rules_version = '2';
+// TriplePick Firestore 보안 규칙
+// 모델: 공개 데이터(경기/AI예측/집계)는 읽기 허용, 모든 쓰기는 서버(Admin SDK·Cloud Functions)만.
+// 유저 예측/구독/참여는 클라이언트 직접 접근 금지 → 콜러블 함수로만 처리(검증·집계·PII 보호).
+service cloud.firestore {
+  match /databases/{database}/documents {
+
+    // ---- 공개 읽기 전용 (쓰기는 Admin SDK가 규칙 우회) ----
+    match /matches/{matchId} {
+      allow read: if true;
+      allow write: if false;
+    }
+    match /ai_predictions/{docId} {
+      allow read: if true;
+      allow write: if false;
+    }
+    match /crowd_stats/{matchId} {
+      allow read: if true;      // 군중 분포(퍼센트, PII 없음)
+      allow write: if false;    // submitPrediction 함수가 트랜잭션으로 증분
+    }
+
+    // ---- 비공개: 함수/Admin 전용 (클라이언트 직접 접근 전면 금지) ----
+    match /user_predictions/{docId} {
+      allow read, write: if false;   // 제출/조회는 콜러블 함수로만, 이메일 등 PII 보호
+    }
+    match /notify_subscriptions/{docId} {
+      allow read, write: if false;   // 결과 알림 구독 (Resend 발송용)
+    }
+    match /event_participation/{deviceId} {
+      allow read, write: if false;   // R2 — 상금 챌린지 누적/자격
+    }
+
+    // 그 외 전부 차단
+    match /{document=**} {
+      allow read, write: if false;
+    }
+  }
+}
+
+// 참고: 클라이언트 직접 쓰기 방식을 택할 경우(함수 없이), user_predictions에
+// create 검증 규칙(킥오프 -10분 lock, outcome ∈ {TEAM_A_WIN,DRAW,TEAM_B_WIN},
+// score 0~9 정수, nickname 2~16자, docId == matchId+"_"+deviceId)을 넣어야 한다.
+// 단 crowd_stats 원자적 증분과 PII 보호 때문에 콜러블 함수 방식을 권장한다(docs/BACKEND.md).
diff --git a/lib/firebase.ts b/lib/firebase.ts
new file mode 100644
index 0000000..2f1847b
--- /dev/null
+++ b/lib/firebase.ts
@@ -0,0 +1,24 @@
+// Firebase 클라이언트 초기화 (env에서 config 로드). 실제 키는 .env.local 에.
+// 사용처: lib/data.ts(Firestore 읽기), Arena.tsx 제출(콜러블 함수 호출).
+import { initializeApp, getApps, type FirebaseApp } from "firebase/app";
+import { getFirestore, type Firestore } from "firebase/firestore";
+import { getFunctions, type Functions } from "firebase/functions";
+
+const config = {
+  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
+  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
+  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
+  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET,
+  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
+  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID,
+};
+
+let app: FirebaseApp | null = null;
+export function getFirebase(): { db: Firestore; fns: Functions } {
+  if (!config.projectId) {
+    throw new Error("Firebase env 미설정 — .env.local 에 NEXT_PUBLIC_FIREBASE_* 채우기");
+  }
+  app = getApps()[0] ?? initializeApp(config);
+  const region = process.env.NEXT_PUBLIC_FUNCTIONS_REGION || "asia-northeast3";
+  return { db: getFirestore(app), fns: getFunctions(app, region) };
+}
diff --git a/package-lock.json b/package-lock.json
index 4c85443..deb00cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "name": "triplepick-web",
       "version": "0.1.0",
       "dependencies": {
+        "firebase": "^12.14.0",
         "next": "16.2.7",
         "react": "19.2.4",
         "react-dom": "19.2.4"
@@ -453,6 +454,648 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@firebase/ai": {
+      "version": "2.13.0",
+      "resolved": "https://registry.npmjs.org/@firebase/ai/-/ai-2.13.0.tgz",
+      "integrity": "sha512-nJJDQKqjAcbkZdZGT/5WTVLrGZ+pYhWbwKC90nNzmvtoRTtnOJaNS34fhKSHQeB9SALgD2kxuWT5I4AkytdZ/Q==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@firebase/app-check-interop-types": "0.3.4",
+        "@firebase/component": "0.7.3",
+        "@firebase/logger": "0.5.1",
+        "@firebase/util": "1.15.1",
+        "tslib": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "@firebase/app": "0.x",
+        "@firebase/app-types": "0.x"
+      }
+    },
+    "node_modules/@firebase/analytics": {
+      "version": "0.10.22",
+      "resolved": "https://registry.npmjs.org/@firebase/analytics/-/analytics-0.10.22.tgz",
+      "integrity": "sha512-8BSaq/QRGU1+xyi8L2PTLTJU7MH9aMA72RQdIxrbhWFauOZY9OXo8f2YDN/972xA8d588tlnNVEQ2Mo69pT9Ow==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@firebase/component": "0.7.3",
+        "@firebase/installations": "0.6.22",
+        "@firebase/logger": "0.5.1",
+        "@firebase/util": "1.15.1",
+        "tslib": "^2.1.0"
+      },
+      "peerDependencies": {
+        "@firebase/app": "0.x"
+      }
+    },
+    "node_modules/@firebase/analytics-compat": {
+      "version": "0.2.28",
+      "resolved": "https://registry.npmjs.org/@firebase/analytics-compat/-/analytics-compat-0.2.28.tgz",
+      "integrity": "sha512-lIAlqUUbBu93FJMlQfslryQtBwwzdzvp23ePC6FNgymXk6Ook5v4Uvc0vdutvoIeqmyA3LfP0ZeRFK8+11kOOQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@firebase/analytics": "0.10.22",
+        "@firebase/analytics-types": "0.8.4",
+        "@firebase/component": "0.7.3",
+        "@firebase/util": "1.15.1",
+        "tslib": "^2.1.0"
+      },
+      "peerDependencies": {
+        "@firebase/app-compat": "0.x"
+      }
+    },
+    "node_modules/@firebase/analytics-types": {
+      "version": "0.8.4",
+      "resolved": "https://registry.npmjs.org/@firebase/analytics-types/-/analytics-types-0.8.4.tgz",
+      "integrity": "sha512-zQ+XTgkwH6CY/eUSHJRP7e4LxM30RCxlCmob5sy2axs25GE3Ny0XdgpDscMTHHQIGqWkxPXad4w2Mw9sCgT8zQ==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@firebase/app": {
+      "version": "0.14.13",
+      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.14.13.tgz",
+      "integrity": "sha512-H89Jeyp31+EZk9GPu6vaeL9mEmoXgM3nASB7UPBYYS/lqAks21mO1BU1dF8NbsVTL6tgGZkGUtiGJgxtDiwHkw==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@firebase/component": "0.7.3",
+        "@firebase/logger": "0.5.1",
+        "@firebase/util": "1.15.1",
+        "idb": "7.1.1",
+        "tslib": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      }
+    },
+    "node_modules/@firebase/app-check": {
+      "version": "0.11.4",
+      "resolved": "https://registry.npmjs.org/@firebase/app-check/-/app-check-0.11.4.tgz",
+      "integrity": "sha512-G8EsbVJV9gSfoibx0dNoNOUrvr+PkL7J//+W/BST/oUassimkZeq9bjj3bKkB0pn4og5GMQ9qs7FefwP00kkgg==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@firebase/component": "0.7.3",
+        "@firebase/logger": "0.5.1",
+        "@firebase/util": "1.15.1",
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@@ -4906,6 +5714,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/long": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",
+      "integrity": "sha512-mNAgZ1GmyNhD7AuqnTG3/VQ26o760+ZYBPKjPvugO8+nLbYfX6TVpJPseBvopbdY+qpZ/lKUnmEc1LeZYS3QAA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/loose-envify": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
@@ -5465,6 +6279,30 @@
         "react-is": "^16.13.1"
       }
     },
+    "node_modules/protobufjs": {
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.6.2.tgz",
+      "integrity": "sha512-N9EiLovGEQOJSPF26Ij7qUGvahfEnq0eeYZ02aigIedkmz1qZSwjnP9SBITHJuF/6MYbIW4HDN8zdYjsjqJKXQ==",
+      "hasInstallScript": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@protobufjs/aspromise": "^1.1.2",
+        "@protobufjs/base64": "^1.1.2",
+        "@protobufjs/codegen": "^2.0.5",
+        "@protobufjs/eventemitter": "^1.1.1",
+        "@protobufjs/fetch": "^1.1.1",
+        "@protobufjs/float": "^1.0.2",
+        "@protobufjs/inquire": "^1.1.2",
+        "@protobufjs/path": "^1.1.2",
+        "@protobufjs/pool": "^1.1.0",
+        "@protobufjs/utf8": "^1.1.1",
+        "@types/node": ">=13.7.0",
+        "long": "^5.3.2"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/punycode": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
@@ -5568,6 +6406,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/require-directory": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+      "integrity": "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/resolve": {
       "version": "2.0.0-next.7",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-2.0.0-next.7.tgz",
@@ -5667,6 +6514,26 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/safe-push-apply": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/safe-push-apply/-/safe-push-apply-1.0.0.tgz",
@@ -5954,6 +6821,26 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/string-width/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "license": "MIT"
+    },
     "node_modules/string.prototype.includes": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/string.prototype.includes/-/string.prototype.includes-2.0.1.tgz",
@@ -6068,6 +6955,18 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/strip-bom": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
@@ -6419,7 +7318,6 @@
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
       "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/unrs-resolver": {
@@ -6501,6 +7399,35 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/web-vitals": {
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/web-vitals/-/web-vitals-4.2.4.tgz",
+      "integrity": "sha512-r4DIlprAGwJ7YM11VZp4R884m0Vmgr6EAKe3P+kO0PPj3Unqyvv59rczf6UiGcb9Z8QxZVcqKNwv/g0WNdWwsw==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/websocket-driver": {
+      "version": "0.7.5",
+      "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.5.tgz",
+      "integrity": "sha512-ZL2+3c7kMBdIRCMz6l8jQMHyGVxj+UL+xVk74Ombiciboca8rHa15L86B19E5oh1pL9Ii/uj54gtsIrZGMo6zA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "http-parser-js": ">=0.5.1",
+        "safe-buffer": ">=5.1.0",
+        "websocket-extensions": ">=0.1.1"
+      },
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/websocket-extensions": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.4.tgz",
+      "integrity": "sha512-OqedPIGOfsDlo31UNwYbCFMSaO9m9G/0faIHj5/dZFDMFqPTcx6UwqyOy3COEaEOg/9VsGIpdqn62W5KhoKSpg==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -6616,6 +7543,32 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/wrap-ansi": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -6623,6 +7576,33 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index 291f6cc..72cb25f 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "firebase": "^12.14.0",
     "next": "16.2.7",
     "react": "19.2.4",
     "react-dom": "19.2.4"
diff --git a/scripts/seed.mjs b/scripts/seed.mjs
new file mode 100644
index 0000000..19a3711
--- /dev/null
+++ b/scripts/seed.mjs
@@ -0,0 +1,58 @@
+// Firestore 시드 스크립트 — matches / ai_predictions / crowd_stats 초기화
+// 실행: GOOGLE_APPLICATION_CREDENTIALS=./serviceAccount.json node scripts/seed.mjs
+// ⚠️ AI 예측은 플레이스홀더. 발행 전 실제 GPT/Claude/Gemini 출력으로 교체.
+// (경기 데이터는 lib/schedule.ts 와 동일하게 유지할 것 — 여기서는 JS로 인라인)
+import { initializeApp, cert, applicationDefault } from "firebase-admin/app";
+import { getFirestore, FieldValue } from "firebase-admin/firestore";
+
+initializeApp({ credential: applicationDefault() });
+const db = getFirestore();
+
+const lock = (iso) => new Date(new Date(iso).getTime() - 10 * 60000).toISOString();
+const T = {
+  KOR: { name: "Korea Republic", shortName: "한국", code: "KOR", flag: "🇰🇷" },
+  CZE: { name: "Czechia", shortName: "체코", code: "CZE", flag: "🇨🇿" },
+  MEX: { name: "Mexico", shortName: "멕시코", code: "MEX", flag: "🇲🇽" },
+  RSA: { name: "South Africa", shortName: "남아공", code: "RSA", flag: "🇿🇦" },
+};
+
+const MATCHES = [
+  ["A_MEX_RSA_20260612", "Match 01 · 개막전", T.MEX, T.RSA, "2026-06-12T04:00:00+09:00", "Estadio Azteca · Mexico City", "월드컵 개막전, AI는 개최국을 믿을까"],
+  ["A_KOR_CZE_20260612", "Match 01", T.KOR, T.CZE, "2026-06-12T11:00:00+09:00", "Estadio Guadalajara (Akron)", "한국 첫 경기, AI의 선택은 갈렸다"],
+  ["A_CZE_RSA_20260619", "Match 02", T.CZE, T.RSA, "2026-06-19T01:00:00+09:00", "USA (TBD)", "체코 vs 남아공, AI의 예측은"],
+  ["A_MEX_KOR_20260619", "Match 02", T.MEX, T.KOR, "2026-06-19T10:00:00+09:00", "Estadio Guadalajara (Akron)", "개최국 멕시코 vs 한국, AI는 누구 편"],
+  ["A_CZE_MEX_20260625", "Match 03", T.CZE, T.MEX, "2026-06-25T10:00:00+09:00", "Estadio Azteca · Mexico City", "체코 vs 멕시코, 운명의 최종전"],
+  ["A_RSA_KOR_20260625", "Match 03", T.RSA, T.KOR, "2026-06-25T10:00:00+09:00", "Estadio BBVA · Monterrey", "한국 16강의 갈림길, AI의 마지막 예측"],
+];
+
+// 한국 vs 체코 AI 예측 (플레이스홀더)
+const AI = {
+  A_KOR_CZE_20260612: [
+    { model: "GPT", outcome: "TEAM_A_WIN", scoreA: 2, scoreB: 1, confidencePct: 62, reasonShort: "한국의 측면 공격 우위와 세트피스 강점", generatedAt: "2026-06-08" },
+    { model: "Claude", outcome: "DRAW", scoreA: 1, scoreB: 1, confidencePct: 41, reasonShort: "중원 밸런스가 팽팽한 접전 예상", generatedAt: "2026-06-08" },
+    { model: "Gemini", outcome: "TEAM_B_WIN", scoreA: 0, scoreB: 2, confidencePct: 28, reasonShort: "체코의 전환 속도와 결정력 우세", generatedAt: "2026-06-08" },
+  ],
+};
+
+async function run() {
+  const batch = db.batch();
+  for (const [matchId, round, a, b, kickoff, venue, hook] of MATCHES) {
+    batch.set(db.collection("matches").doc(matchId), {
+      matchId, roundLabel: round, group: "A", teamA: a, teamB: b,
+      kickoffKst: kickoff, venue, lockAt: lock(kickoff), status: "upcoming",
+      hookText: hook, result: null, updatedAt: FieldValue.serverTimestamp(),
+    });
+    // crowd_stats 초기화 (0)
+    batch.set(db.collection("crowd_stats").doc(matchId), {
+      matchId, total: 0, teamAWin: 0, draw: 0, teamBWin: 0, updatedAt: FieldValue.serverTimestamp(),
+    }, { merge: true });
+  }
+  for (const [matchId, preds] of Object.entries(AI)) {
+    for (const p of preds) {
+      batch.set(db.collection("ai_predictions").doc(`${matchId}_${p.model}`), { matchId, ...p });
+    }
+  }
+  await batch.commit();
+  console.log(`seeded: ${MATCHES.length} matches, ${Object.values(AI).flat().length} ai_predictions, crowd_stats init`);
+}
+run().catch((e) => { console.error(e); process.exit(1); });