feat: 다국어 화

.cli/docs/architecture.md

@@ -71,6 +71,18 @@
 - `/boarding` 라우트: 딥링크 호환을 위해 동일 form/model 재사용
 - 메모/노트 입력은 탑승 생성 경로에서 제거됨
 
+## I18n 소유권 (1단계)
+
+- 지원 언어/기본값/카피 상수: `shared/config/i18n.ts`
+- 초기 언어 결정/수동 고정 저장: `features/i18n/model/resolveInitialLocale.ts`
+- 런타임 번역 접근(context/hook): `features/i18n/model/useI18n.tsx`
+- 앱 초기 bootstrap + 수동 변경 UI(헤더 select): `features/i18n/ui/I18nLayoutShell.tsx`
+- `app/layout.tsx`는 i18n shell을 마운트해 단일 URL에서 언어 상태만 관리한다
+- 우선순위: `수동 저장값(localStorage) > 브라우저 언어 > en`
+- 지원 외 언어는 `en`으로 폴백한다
+- 페이지/UI 문구는 key(`lobby.*`, `flight.*`, `debrief.*`, `log.*`, `settings.*`, `routes.*`)로 관리한다
+- 항로 메타(`shared/config/routes.ts`)는 사용자 노출 문자열 대신 i18n key를 소유한다
+
 ## 변경 정책
 
 - 구조 리팩토링은 명시적으로 요청되지 않는 한 동작을 바꾸면 안 된다

src/app/boarding/page.tsx

@@ -4,15 +4,18 @@ import { Suspense } from 'react';
 import { useRouter, useSearchParams } from 'next/navigation';
 import { ROUTES } from '@/shared/config/routes';
 import { BoardingMissionForm, startVoyage } from '@/features/boarding';
+import { useI18n } from '@/features/i18n/model/useI18n';
 
 function BoardingContent() {
+  const { t } = useI18n();
   const router = useRouter();
   const searchParams = useSearchParams();
   const routeId = searchParams.get('routeId');
   const route = ROUTES.find(r => r.id === routeId) || ROUTES[0];
+  const routeName = t(route.nameKey, undefined, route.id);
 
   const handleDocking = (mission: string) => {
-    const started = startVoyage({ route, mission });
+    const started = startVoyage({ route, mission, routeName });
     if (!started) return;
     router.push('/flight');
   };
@@ -20,8 +23,12 @@ function BoardingContent() {
   return (
     <div className="flex flex-col flex-1 p-6 animate-in slide-in-from-bottom-4 duration-500">
       <div className="mb-8">
-        <h2 className="text-sm text-indigo-400 font-semibold mb-1 uppercase tracking-widest">Boarding Check</h2>
+        <h2 className="text-sm text-indigo-400 font-semibold mb-1 uppercase tracking-widest">
-        <h1 className="text-3xl font-bold text-white">{route.name} 항로 탑승</h1>
+          {t('boarding.check')}
+        </h2>
+        <h1 className="text-3xl font-bold text-white">
+          {t('boarding.routeBoarding', { routeName })}
+        </h1>
       </div>
 
       <div className="space-y-8 flex-1">
@@ -35,8 +42,10 @@ function BoardingContent() {
 }
 
 export default function BoardingPage() {
+  const { t } = useI18n();
+
   return (
-    <Suspense fallback={<div className="p-6">Loading...</div>}>
+    <Suspense fallback={<div className="p-6">{t('common.loading')}</div>}>
       <BoardingContent />
     </Suspense>
   );

src/app/debrief/page.tsx

@@ -2,10 +2,13 @@
 
 import { FormEvent, useEffect, useState } from 'react';
 import { useRouter } from 'next/navigation';
+import { useI18n } from '@/features/i18n/model/useI18n';
+import { DEBRIEF_STATUS_OPTIONS } from '@/shared/config/i18n';
 import { getCurrentVoyage, saveToHistory, saveCurrentVoyage } from '@/shared/lib/store';
 import { Voyage, VoyageStatus } from '@/shared/types';
 
 export default function DebriefPage() {
+  const { t } = useI18n();
   const router = useRouter();
   const [voyage, setVoyage] = useState<Voyage | null>(null);
   
@@ -43,54 +46,58 @@ export default function DebriefPage() {
 
   if (!voyage) return null;
 
-  const statusOptions: { value: VoyageStatus; label: string; desc: string }[] = [
+  const statusOptions = DEBRIEF_STATUS_OPTIONS.map((option) => ({
-    { value: 'completed', label: '계획대로', desc: '목표를 달성했습니다' },
+    value: option.value as VoyageStatus,
-    { value: 'partial', label: '부분 진행', desc: '절반의 성공입니다' },
+    label: t(option.labelKey),
-    { value: 'reoriented', label: '방향 재설정', desc: '새로운 발견을 했습니다' },
+    desc: t(option.descKey),
-  ];
+  }));
 
   return (
     <div className="flex flex-col flex-1 p-6 max-w-2xl mx-auto w-full animate-in zoom-in-95 duration-500">
       <header className="mb-8 text-center">
-        <h1 className="text-2xl font-bold text-white mb-2">무사히 궤도에 도착했습니다</h1>
+        <h1 className="text-2xl font-bold text-white mb-2">{t('debrief.page.title')}</h1>
-        <p className="text-slate-400">이번 항해를 짧게 기록하고 마무리하세요.</p>
+        <p className="text-slate-400">{t('debrief.page.description')}</p>
       </header>
 
       <form onSubmit={handleSubmit} className="space-y-8 flex-1">
         {/* Question 1: Status */}
         <section>
           <label className="block text-sm font-medium text-slate-300 mb-3">
-            항해 결과
+            {t('debrief.status.label')}
           </label>
-          <div className="grid grid-cols-1 sm:grid-cols-3 gap-3">
+          <div className="grid grid-cols-1 md:grid-cols-3 gap-3">
             {statusOptions.map((opt) => (
               <button
                 key={opt.value}
                 type="button"
                 onClick={() => setStatus(opt.value)}
-                className={`p-4 rounded-xl border text-left transition-all ${
+                className={`flex min-h-[116px] flex-col justify-between rounded-xl border px-4 py-3.5 text-left transition-all ${
                   status === opt.value
                     ? 'bg-indigo-900/40 border-indigo-500 ring-1 ring-indigo-500'
                     : 'bg-slate-900/50 border-slate-800 hover:bg-slate-800'
                 }`}
               >
-                <div className="font-bold text-slate-200 mb-1">{opt.label}</div>
+                <div className="text-sm leading-snug font-bold text-slate-200 break-keep">
-                <div className="text-xs text-slate-500">{opt.desc}</div>
+                  {opt.label}
+                </div>
+                <div className="mt-2 text-[11px] leading-relaxed text-slate-500">
+                  {opt.desc}
+                </div>
               </button>
             ))}
           </div>
         </section>
 
-        {/* Question 2: Secured */}
+        {/* Question 2: Reflection */}
         <section>
           <label className="block text-sm font-medium text-slate-300 mb-2">
-            이번 항해에서 확보한 것 (What)
+            {t('debrief.reflection.label')}
           </label>
           <input
             type="text"
             value={progress}
             onChange={(e) => setProgress(e.target.value)}
-            placeholder="예: 기획안 목차 구성 완료"
+            placeholder={t('debrief.reflection.placeholder')}
             className="w-full bg-slate-900/30 border border-slate-800 rounded-lg px-4 py-3 text-slate-200 focus:border-indigo-500 focus:ring-1 focus:ring-indigo-500 outline-none transition-all"
           />
         </section>
@@ -100,7 +107,7 @@ export default function DebriefPage() {
           disabled={!status}
           className="w-full mt-10 py-4 bg-indigo-600 hover:bg-indigo-500 disabled:bg-slate-800 disabled:text-slate-500 text-white font-bold rounded-xl transition-all shadow-lg shadow-indigo-900/20"
         >
-          항해일지 저장
+          {t('debrief.save')}
         </button>
       </form>
     </div>

src/app/layout.tsx

@@ -1,6 +1,6 @@
 import type { Metadata } from "next";
 import "./globals.css";
-import Link from "next/link";
+import { I18nLayoutShell } from "@/features/i18n/ui/I18nLayoutShell";
 
 export const metadata: Metadata = {
   title: "Focustella",
@@ -13,23 +13,9 @@ export default function RootLayout({
   children: React.ReactNode;
 }>) {
   return (
-    <html lang="ko" className="dark">
+    <html lang="en" className="dark">
       <body className="bg-slate-950 text-slate-100 min-h-screen font-sans selection:bg-indigo-500/30 overflow-x-hidden">
-        {/* Layout Container */}
+        <I18nLayoutShell>{children}</I18nLayoutShell>
-        <div className="relative z-10 min-h-screen flex flex-col max-w-6xl mx-auto">
-          <header className="flex items-center justify-between px-6 py-4">
-            <Link href="/" className="font-bold text-lg tracking-wider text-indigo-400 hover:text-indigo-300 transition-colors z-50">
-              FOCUSTELLA
-            </Link>
-            <nav className="flex gap-4 text-sm font-medium text-slate-400 z-50">
-              <Link href="/log" className="hover:text-slate-200 transition-colors">항해일지</Link>
-              <Link href="/settings" className="hover:text-slate-200 transition-colors">설정</Link>
-            </nav>
-          </header>
-          <main className="flex-1 relative flex flex-col w-full">
-            {children}
-          </main>
-        </div>
       </body>
     </html>
   );

src/app/log/[id]/page.tsx

@@ -1,15 +1,17 @@
 'use client';
 
 import { useEffect, useState, use } from 'react';
-import { useRouter } from 'next/navigation';
 import Link from 'next/link';
+import { useI18n } from '@/features/i18n/model/useI18n';
+import { VOYAGE_STATUS_LABEL_KEYS } from '@/shared/config/i18n';
+import { findRouteById } from '@/shared/config/routes';
 import { getHistory } from '@/shared/lib/store';
 import { Voyage } from '@/shared/types';
 
 export default function LogDetailPage({ params }: { params: Promise<{ id: string }> }) {
+  const { t } = useI18n();
   // Next.js 15: params is a Promise
   const resolvedParams = use(params);
-  const router = useRouter();
   const [log, setLog] = useState<Voyage | null>(null);
 
   useEffect(() => {
@@ -18,47 +20,49 @@ export default function LogDetailPage({ params }: { params: Promise<{ id: string
     if (found) setLog(found);
   }, [resolvedParams.id]);
 
-  if (!log) return <div className="p-6 text-slate-500">Loading or Not Found...</div>;
+  if (!log) {
+    return <div className="p-6 text-slate-500">{t('log.detail.loadingOrNotFound')}</div>;
+  }
+
+  const route = findRouteById(log.routeId);
+  const routeName = route ? t(route.nameKey, undefined, log.routeName) : log.routeName;
+  const statusLabel = t(VOYAGE_STATUS_LABEL_KEYS[log.status], undefined, t('status.in_progress'));
 
   return (
     <div className="flex flex-col flex-1 p-6 space-y-8 animate-in fade-in duration-300">
       <header className="border-b border-slate-800 pb-4">
-        <Link href="/log" className="text-sm text-indigo-400 hover:text-indigo-300 mb-4 inline-block">&larr; 목록으로</Link>
+        <Link href="/log" className="text-sm text-indigo-400 hover:text-indigo-300 mb-4 inline-block">
+          &larr; {t('log.detail.back')}
+        </Link>
         <h1 className="text-2xl font-bold text-white">{log.missionText}</h1>
         <div className="flex gap-3 mt-2 text-sm text-slate-500">
           <span>{new Date(log.startedAt).toLocaleString()}</span>
           <span>•</span>
-          <span>{log.routeName} ({log.durationMinutes}m)</span>
+          <span>{routeName} ({log.durationMinutes}{t('common.minuteShort')})</span>
         </div>
       </header>
 
       <div className="space-y-6">
         <div className="bg-slate-900/30 p-4 rounded-lg border border-slate-800/50">
-          <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">결과 상태</h3>
+          <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">{t('log.detail.statusTitle')}</h3>
-          <p className="text-lg text-indigo-100">
+          <p className="text-lg text-indigo-100">{statusLabel}</p>
-            {log.status === 'completed' && '✅ 계획대로'}
-            {log.status === 'partial' && '🌓 부분 진행'}
-            {log.status === 'reoriented' && '🧭 방향 재설정'}
-            {log.status === 'aborted' && '🚨 조기 귀환'}
-            {log.status === 'in_progress' && '진행 중'}
-          </p>
         </div>
 
         <div className="grid gap-6 sm:grid-cols-2">
           <div>
-            <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">확보한 것</h3>
+            <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">{t('log.detail.progressTitle')}</h3>
             <p className="text-slate-300 leading-relaxed bg-slate-900/20 p-3 rounded">{log.debriefProgress || '-'}</p>
           </div>
           
           <div>
-            <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">다음 행동</h3>
+            <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">{t('log.detail.nextActionTitle')}</h3>
             <p className="text-slate-300 leading-relaxed bg-slate-900/20 p-3 rounded">{log.nextAction || '-'}</p>
           </div>
         </div>
 
         {log.notes && (
           <div>
-            <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">초기 메모</h3>
+            <h3 className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-2">{t('log.detail.initialNoteTitle')}</h3>
             <p className="text-slate-400 text-sm italic">"{log.notes}"</p>
           </div>
         )}

src/app/log/page.tsx

@@ -2,10 +2,14 @@
 
 import { useEffect, useState } from 'react';
 import Link from 'next/link';
+import { useI18n } from '@/features/i18n/model/useI18n';
+import { VOYAGE_STATUS_LABEL_KEYS } from '@/shared/config/i18n';
+import { findRouteById } from '@/shared/config/routes';
 import { getHistory } from '@/shared/lib/store';
 import { Voyage, VoyageStatus } from '@/shared/types';
 
 export default function LogListPage() {
+  const { t } = useI18n();
   const [logs, setLogs] = useState<Voyage[]>([]);
 
   useEffect(() => {
@@ -13,48 +17,52 @@ export default function LogListPage() {
   }, []);
 
   const getStatusLabel = (s: VoyageStatus) => {
-    switch(s) {
+    return t(VOYAGE_STATUS_LABEL_KEYS[s], undefined, t('status.in_progress'));
-      case 'completed': return '✅ 계획대로';
-      case 'partial': return '🌓 부분 진행';
-      case 'reoriented': return '🧭 방향 재설정';
-      case 'aborted': return '🚨 조기 귀환';
-      default: return '진행 중';
-    }
   };
 
   return (
     <div className="flex flex-col flex-1 p-6">
-      <h1 className="text-xl font-bold text-slate-100 mb-6">나의 항해 기록</h1>
+      <h1 className="text-xl font-bold text-slate-100 mb-6">{t('log.title')}</h1>
 
       {logs.length === 0 ? (
         <div className="flex flex-col items-center justify-center flex-1 py-20 text-slate-500 border border-dashed border-slate-800 rounded-xl">
-          <p className="mb-4">아직 기록된 항해가 없습니다.</p>
+          <p className="mb-4">{t('log.empty')}</p>
           <Link href="/" className="text-indigo-400 hover:text-indigo-300 underline">
-            첫 항해 떠나기
+            {t('log.firstVoyage')}
           </Link>
         </div>
       ) : (
         <div className="grid gap-3">
-          {logs.map((log) => (
+          {logs.map((log) => {
-            <Link 
+            const route = findRouteById(log.routeId);
-              key={log.id} 
+            const routeName = route
-              href={`/log/${log.id}`}
+              ? t(route.nameKey, undefined, log.routeName)
-              className="block bg-slate-900/50 border border-slate-800 hover:border-slate-600 rounded-lg p-4 transition-colors"
+              : log.routeName;
-            >
+
-              <div className="flex justify-between items-start mb-1">
+            return (
-                <span className="text-xs text-slate-500">
+              <Link
-                  {new Date(log.startedAt).toLocaleDateString()}
+                key={log.id}
-                </span>
+                href={`/log/${log.id}`}
-                <span className="text-xs font-medium text-slate-400 bg-slate-800 px-1.5 py-0.5 rounded">
+                className="block bg-slate-900/50 border border-slate-800 hover:border-slate-600 rounded-lg p-4 transition-colors"
-                  {getStatusLabel(log.status)}
+              >
-                </span>
+                <div className="flex justify-between items-start mb-1">
-              </div>
+                  <span className="text-xs text-slate-500">
-              <h3 className="font-semibold text-slate-200 truncate mb-1">
+                    {new Date(log.startedAt).toLocaleDateString()}
-                {log.missionText}
+                  </span>
-              </h3>
+                  <span className="text-xs font-medium text-slate-400 bg-slate-800 px-1.5 py-0.5 rounded">
-              <p className="text-xs text-slate-500">{log.routeName} · {log.durationMinutes}min</p>
+                    {getStatusLabel(log.status)}
-            </Link>
+                  </span>
-          ))}
+                </div>
+                <h3 className="font-semibold text-slate-200 truncate mb-1">
+                  {log.missionText}
+                </h3>
+                <p className="text-xs text-slate-500">
+                  {routeName} · {log.durationMinutes}
+                  {t('common.minuteShort')}
+                </p>
+              </Link>
+            );
+          })}
         </div>
       )}
     </div>

src/app/settings/page.tsx

@@ -1,9 +1,11 @@
 'use client';
 
 import { useEffect, useState } from 'react';
+import { useI18n } from '@/features/i18n/model/useI18n';
 import { getPreferences, savePreferences } from '@/shared/lib/store';
 
 export default function SettingsPage() {
+  const { t } = useI18n();
   const [hideSeconds, setHideSeconds] = useState(false);
 
   useEffect(() => {
@@ -19,13 +21,13 @@ export default function SettingsPage() {
 
   return (
     <div className="p-6">
-      <h1 className="text-xl font-bold text-slate-100 mb-8">설정</h1>
+      <h1 className="text-xl font-bold text-slate-100 mb-8">{t('settings.title')}</h1>
       
       <div className="space-y-6">
         <div className="flex items-center justify-between bg-slate-900/40 p-4 rounded-xl border border-slate-800">
           <div>
-            <h3 className="font-medium text-slate-200">초 단위 숨기기</h3>
+            <h3 className="font-medium text-slate-200">{t('settings.hideSeconds.title')}</h3>
-            <p className="text-xs text-slate-500">타이머에서 분 단위만 표시하여 불안감을 줄입니다.</p>
+            <p className="text-xs text-slate-500">{t('settings.hideSeconds.description')}</p>
           </div>
           <button 
             onClick={handleToggle}

src/features/boarding/model/startVoyage.ts

@@ -9,9 +9,11 @@ const createVoyageId = () =>
 export const startVoyage = ({
   route,
   mission,
+  routeName,
 }: {
   route: Route;
   mission: string;
+  routeName: string;
 }) => {
   const missionText = mission.trim();
   if (!missionText) {
@@ -21,7 +23,7 @@ export const startVoyage = ({
   const newVoyage: Voyage = {
     id: createVoyageId(),
     routeId: route.id,
-    routeName: route.name,
+    routeName,
     durationMinutes: route.durationMinutes,
     startedAt: Date.now(),
     status: 'in_progress',

src/features/boarding/ui/BoardingMissionForm.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { FormEvent, useState } from 'react';
+import { useI18n } from '@/features/i18n/model/useI18n';
 
 export function BoardingMissionForm({
   onDock,
@@ -13,6 +14,7 @@ export function BoardingMissionForm({
   autoFocus?: boolean;
   compact?: boolean;
 }) {
+  const { t } = useI18n();
   const [mission, setMission] = useState('');
   const trimmedMission = mission.trim();
   const canSubmit = Boolean(trimmedMission);
@@ -30,13 +32,13 @@ export function BoardingMissionForm({
     >
       <div className="space-y-3">
         <label className="block text-sm font-medium text-slate-300">
-          이번 항해의 핵심 목표
+          {t('boarding.missionLabel')}
         </label>
         <input
           type="text"
           value={mission}
           onChange={(event) => setMission(event.target.value)}
-          placeholder="예: 서론 3문단 완성하기"
+          placeholder={t('boarding.missionPlaceholder')}
           className="w-full border-b-2 border-slate-700 bg-slate-900/50 px-0 py-3 text-lg outline-none transition-colors placeholder:text-slate-600 focus:border-indigo-500"
           autoFocus={autoFocus}
         />
@@ -49,7 +51,7 @@ export function BoardingMissionForm({
             onClick={onCancel}
             className="rounded-xl border border-slate-700 bg-transparent px-4 py-2 font-semibold text-slate-300 transition-colors hover:bg-slate-900/60 hover:text-white"
           >
-            취소
+            {t('boarding.cancel')}
           </button>
         )}
         <button
@@ -57,7 +59,7 @@ export function BoardingMissionForm({
           disabled={!canSubmit}
           className={`rounded-xl bg-indigo-600 font-bold text-white transition-all shadow-lg shadow-indigo-900/30 hover:bg-indigo-500 disabled:bg-slate-800 disabled:text-slate-500 ${compact ? 'px-6 py-2' : 'w-full py-4 text-lg'}`}
         >
-          도킹 완료 (출항)
+          {t('boarding.submit')}
         </button>
       </div>
     </form>

src/features/i18n/model/resolveInitialLocale.ts

@@ -0,0 +1,42 @@
+import {
+  DEFAULT_LOCALE,
+  Locale,
+  MANUAL_LOCALE_STORAGE_KEY,
+  SUPPORTED_LOCALES,
+} from "@/shared/config/i18n";
+
+const normalizeLocale = (raw: string | null | undefined): Locale | null => {
+  if (!raw) return null;
+  const base = raw.trim().toLowerCase().split("-")[0];
+
+  return SUPPORTED_LOCALES.includes(base as Locale) ? (base as Locale) : null;
+};
+
+export const getManualLocale = (): Locale | null => {
+  if (typeof window === "undefined") return null;
+  return normalizeLocale(localStorage.getItem(MANUAL_LOCALE_STORAGE_KEY));
+};
+
+const getBrowserLocale = (): Locale | null => {
+  if (typeof navigator === "undefined") return null;
+  const candidates = [...(navigator.languages ?? []), navigator.language];
+
+  for (const candidate of candidates) {
+    const locale = normalizeLocale(candidate);
+    if (locale) return locale;
+  }
+
+  return null;
+};
+
+export const resolveInitialLocale = (): Locale => {
+  const manualLocale = getManualLocale();
+  if (manualLocale) return manualLocale;
+
+  return getBrowserLocale() ?? DEFAULT_LOCALE;
+};
+
+export const saveManualLocale = (locale: Locale) => {
+  if (typeof window === "undefined") return;
+  localStorage.setItem(MANUAL_LOCALE_STORAGE_KEY, locale);
+};

src/features/i18n/model/useI18n.tsx

@@ -0,0 +1,45 @@
+"use client";
+
+import { ReactNode, createContext, useContext } from "react";
+
+import {
+  DEFAULT_LOCALE,
+  I18nKey,
+  Locale,
+  TranslationParams,
+  translateText,
+} from "@/shared/config/i18n";
+
+type I18nContextValue = {
+  locale: Locale;
+  setLocale: (locale: Locale) => void;
+  t: (key: I18nKey | string, params?: TranslationParams, fallback?: string) => string;
+};
+
+const I18nContext = createContext<I18nContextValue>({
+  locale: DEFAULT_LOCALE,
+  setLocale: () => {},
+  t: (key, params, fallback) =>
+    translateText(DEFAULT_LOCALE, key, params, fallback),
+});
+
+export function I18nProvider({
+  children,
+  locale,
+  setLocale,
+}: {
+  children: ReactNode;
+  locale: Locale;
+  setLocale: (locale: Locale) => void;
+}) {
+  const t = (key: I18nKey | string, params?: TranslationParams, fallback?: string) =>
+    translateText(locale, key, params, fallback);
+
+  return (
+    <I18nContext.Provider value={{ locale, setLocale, t }}>
+      {children}
+    </I18nContext.Provider>
+  );
+}
+
+export const useI18n = () => useContext(I18nContext);

src/features/i18n/ui/I18nLayoutShell.tsx

@@ -0,0 +1,87 @@
+"use client";
+
+import Link from "next/link";
+import { ChangeEvent, useEffect, useState } from "react";
+
+import {
+  DEFAULT_LOCALE,
+  I18nKey,
+  LOCALE_LABELS,
+  Locale,
+  SUPPORTED_LOCALES,
+  translateText,
+} from "@/shared/config/i18n";
+import {
+  resolveInitialLocale,
+  saveManualLocale,
+} from "@/features/i18n/model/resolveInitialLocale";
+import { I18nProvider } from "@/features/i18n/model/useI18n";
+
+export function I18nLayoutShell({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  const [locale, setLocale] = useState<Locale>(DEFAULT_LOCALE);
+
+  useEffect(() => {
+    const initialLocale = resolveInitialLocale();
+    setLocale(initialLocale);
+    document.documentElement.lang = initialLocale;
+  }, []);
+
+  const handleSetLocale = (nextLocale: Locale) => {
+    if (!SUPPORTED_LOCALES.includes(nextLocale)) return;
+    setLocale(nextLocale);
+    saveManualLocale(nextLocale);
+    document.documentElement.lang = nextLocale;
+  };
+
+  const handleLocaleChange = (event: ChangeEvent<HTMLSelectElement>) => {
+    const nextLocale = event.target.value as Locale;
+    handleSetLocale(nextLocale);
+  };
+
+  const t = (key: I18nKey) => translateText(locale, key);
+
+  return (
+    <I18nProvider locale={locale} setLocale={handleSetLocale}>
+      <div className="relative z-10 mx-auto flex min-h-screen max-w-6xl flex-col">
+        <header className="flex items-center justify-between px-6 py-4">
+          <Link
+            href="/"
+            className="z-50 text-lg font-bold tracking-wider text-indigo-400 transition-colors hover:text-indigo-300"
+          >
+            FOCUSTELLA
+          </Link>
+          <nav className="z-50 flex items-center gap-4 text-sm font-medium text-slate-400">
+            <Link href="/log" className="transition-colors hover:text-slate-200">
+              {t("layout.nav.log")}
+            </Link>
+            <Link
+              href="/settings"
+              className="transition-colors hover:text-slate-200"
+            >
+              {t("layout.nav.settings")}
+            </Link>
+            <label className="flex items-center gap-2 text-xs text-slate-400">
+              <span>{t("layout.nav.language")}</span>
+              <select
+                value={locale}
+                onChange={handleLocaleChange}
+                className="rounded border border-slate-700 bg-slate-900/70 px-2 py-1 text-xs text-slate-200 outline-none transition-colors focus:border-indigo-400"
+              >
+                {SUPPORTED_LOCALES.map((item) => (
+                  <option key={item} value={item}>
+                    {LOCALE_LABELS[item]}
+                  </option>
+                ))}
+              </select>
+            </label>
+          </nav>
+        </header>
+        <main className="relative flex w-full flex-1 flex-col">{children}</main>
+      </div>
+    </I18nProvider>
+  );
+}

src/shared/config/i18n.ts

@@ -0,0 +1,297 @@
+import { VoyageStatus } from "@/shared/types";
+
+export const SUPPORTED_LOCALES = ["ko", "en", "ja"] as const;
+
+export type Locale = (typeof SUPPORTED_LOCALES)[number];
+
+export const DEFAULT_LOCALE: Locale = "en";
+
+export const MANUAL_LOCALE_STORAGE_KEY = "focustella_locale_manual_v1";
+
+export const LOCALE_LABELS: Record<Locale, string> = {
+  ko: "한국어",
+  en: "English",
+  ja: "日本語",
+};
+
+const enMessages = {
+  "layout.nav.log": "Logbook",
+  "layout.nav.settings": "Settings",
+  "layout.nav.language": "Language",
+  "common.loading": "Loading...",
+  "common.minuteShort": "min",
+  "routes.station.name": "Space Station",
+  "routes.station.tag": "Wait/Flexible",
+  "routes.station.description": "A safe zone you can stay in without time limits",
+  "routes.orion.name": "Orion",
+  "routes.orion.tag": "Deep Work",
+  "routes.orion.description": "60-minute focus voyage",
+  "routes.gemini.name": "Gemini",
+  "routes.gemini.tag": "Short Sprint",
+  "routes.gemini.description": "30-minute focus voyage",
+  "lobby.title": "Which constellation will you sail to?",
+  "lobby.subtitle": "Choose an orbit that helps your focus.",
+  "lobby.cta.station": "Enter Station (Wait)",
+  "lobby.cta.launch": "Launch Now",
+  "lobby.modal.boardingCheck": "Boarding Check",
+  "lobby.modal.routeBoarding": "{routeName} Route Boarding",
+  "lobby.modal.description": "Set your mission before starting this voyage.",
+  "boarding.check": "Boarding Check",
+  "boarding.routeBoarding": "{routeName} Route Boarding",
+  "boarding.missionLabel": "Core mission for this voyage",
+  "boarding.missionPlaceholder": "e.g. Finish 3 intro paragraphs",
+  "boarding.cancel": "Cancel",
+  "boarding.submit": "Dock Complete (Launch)",
+  "flight.badge.paused": "Paused",
+  "flight.badge.cruising": "Cruising",
+  "flight.missionLabel": "Voyage Mission",
+  "flight.pause": "Pause",
+  "flight.resume": "Resume",
+  "flight.finish.debrief": "Arrived (Debrief)",
+  "flight.finish.end": "End Voyage",
+  "flight.debrief.title": "Wrap up this voyage",
+  "flight.debrief.description": "Write a short note and save it to your logbook.",
+  "debrief.page.title": "You safely reached orbit",
+  "debrief.page.description": "Record this voyage briefly and wrap up.",
+  "debrief.status.label": "Voyage Result",
+  "debrief.option.completed.label": "Completed the mission",
+  "debrief.option.completed.desc": "I finished what I set out to do.",
+  "debrief.option.partial.label": "Made partial progress",
+  "debrief.option.partial.desc": "I advanced key parts and left next steps.",
+  "debrief.option.reoriented.label": "Redefined the mission",
+  "debrief.option.reoriented.desc": "I reset scope and priorities while working.",
+  "debrief.reflection.label": "Reflection after this voyage",
+  "debrief.reflection.placeholder":
+    "e.g. What worked, what did not, and what I learned",
+  "debrief.save": "Save to Logbook",
+  "log.title": "My Voyage Logs",
+  "log.empty": "No voyages recorded yet.",
+  "log.firstVoyage": "Start your first voyage",
+  "log.detail.back": "Back to list",
+  "log.detail.loadingOrNotFound": "Loading or Not Found...",
+  "log.detail.statusTitle": "Result Status",
+  "log.detail.progressTitle": "What I secured",
+  "log.detail.nextActionTitle": "Next Action",
+  "log.detail.initialNoteTitle": "Initial Note",
+  "settings.title": "Settings",
+  "settings.hideSeconds.title": "Hide Seconds",
+  "settings.hideSeconds.description":
+    "Show only minutes on the timer to reduce pressure.",
+  "status.completed": "Completed",
+  "status.partial": "Partial",
+  "status.reoriented": "Reoriented",
+  "status.aborted": "Aborted Early",
+  "status.in_progress": "In Progress",
+} as const;
+
+type I18nMessages = typeof enMessages;
+
+const koMessages: I18nMessages = {
+  "layout.nav.log": "항해일지",
+  "layout.nav.settings": "설정",
+  "layout.nav.language": "언어",
+  "common.loading": "로딩 중...",
+  "common.minuteShort": "분",
+  "routes.station.name": "우주정거장",
+  "routes.station.tag": "대기/자유",
+  "routes.station.description": "시간 제한 없이 머무를 수 있는 안전지대",
+  "routes.orion.name": "오리온",
+  "routes.orion.tag": "딥워크",
+  "routes.orion.description": "60분 집중 항해",
+  "routes.gemini.name": "쌍둥이자리",
+  "routes.gemini.tag": "숏스프린트",
+  "routes.gemini.description": "30분 집중 항해",
+  "lobby.title": "어느 별자리로 출항할까요?",
+  "lobby.subtitle": "몰입하기 좋은 궤도입니다.",
+  "lobby.cta.station": "정거장 진입 (대기)",
+  "lobby.cta.launch": "바로 출항",
+  "lobby.modal.boardingCheck": "Boarding Check",
+  "lobby.modal.routeBoarding": "{routeName} 항로 탑승",
+  "lobby.modal.description": "항해를 시작하기 전에 목표를 설정하세요.",
+  "boarding.check": "Boarding Check",
+  "boarding.routeBoarding": "{routeName} 항로 탑승",
+  "boarding.missionLabel": "이번 항해의 핵심 목표",
+  "boarding.missionPlaceholder": "예: 서론 3문단 완성하기",
+  "boarding.cancel": "취소",
+  "boarding.submit": "도킹 완료 (출항)",
+  "flight.badge.paused": "일시정지",
+  "flight.badge.cruising": "순항 중",
+  "flight.missionLabel": "이번 항해 목표",
+  "flight.pause": "일시정지",
+  "flight.resume": "다시 시작",
+  "flight.finish.debrief": "도착 (회고)",
+  "flight.finish.end": "항해 종료",
+  "flight.debrief.title": "이번 항해를 정리하세요",
+  "flight.debrief.description": "짧게 기록하고 항해일지에 저장합니다.",
+  "debrief.page.title": "무사히 궤도에 도착했습니다",
+  "debrief.page.description": "이번 항해를 짧게 기록하고 마무리하세요.",
+  "debrief.status.label": "항해 결과",
+  "debrief.option.completed.label": "목표를 완수했어요",
+  "debrief.option.completed.desc": "시작할 때 정한 목표를 끝까지 해냈어요",
+  "debrief.option.partial.label": "일부까지 진행했어요",
+  "debrief.option.partial.desc": "중요한 부분을 진행했고 다음 단계가 남았어요",
+  "debrief.option.reoriented.label": "목표를 재정의했어요",
+  "debrief.option.reoriented.desc":
+    "진행 중 목표 범위와 우선순위를 다시 정했어요",
+  "debrief.reflection.label": "이번 항해를 마치고 느낀 점",
+  "debrief.reflection.placeholder":
+    "예: 잘한 점, 아쉬운 점, 느낀 점을 짧게 남겨보세요",
+  "debrief.save": "항해일지 저장",
+  "log.title": "나의 항해 기록",
+  "log.empty": "아직 기록된 항해가 없습니다.",
+  "log.firstVoyage": "첫 항해 떠나기",
+  "log.detail.back": "목록으로",
+  "log.detail.loadingOrNotFound": "로딩 중이거나 기록이 없습니다.",
+  "log.detail.statusTitle": "결과 상태",
+  "log.detail.progressTitle": "확보한 것",
+  "log.detail.nextActionTitle": "다음 행동",
+  "log.detail.initialNoteTitle": "초기 메모",
+  "settings.title": "설정",
+  "settings.hideSeconds.title": "초 단위 숨기기",
+  "settings.hideSeconds.description":
+    "타이머에서 분 단위만 표시하여 불안감을 줄입니다.",
+  "status.completed": "✅ 계획대로",
+  "status.partial": "🌓 부분 진행",
+  "status.reoriented": "🧭 방향 재설정",
+  "status.aborted": "🚨 조기 귀환",
+  "status.in_progress": "진행 중",
+};
+
+const jaMessages: I18nMessages = {
+  "layout.nav.log": "航海ログ",
+  "layout.nav.settings": "設定",
+  "layout.nav.language": "言語",
+  "common.loading": "読み込み中...",
+  "common.minuteShort": "分",
+  "routes.station.name": "宇宙ステーション",
+  "routes.station.tag": "待機/自由",
+  "routes.station.description": "時間制限なしで滞在できる安全地帯",
+  "routes.orion.name": "オリオン",
+  "routes.orion.tag": "ディープワーク",
+  "routes.orion.description": "60分集中航海",
+  "routes.gemini.name": "ふたご座",
+  "routes.gemini.tag": "ショートスプリント",
+  "routes.gemini.description": "30分集中航海",
+  "lobby.title": "どの星座へ航海しますか？",
+  "lobby.subtitle": "集中しやすい軌道を選びましょう。",
+  "lobby.cta.station": "ステーションへ入る（待機）",
+  "lobby.cta.launch": "今すぐ出航",
+  "lobby.modal.boardingCheck": "搭乗チェック",
+  "lobby.modal.routeBoarding": "{routeName} 航路に搭乗",
+  "lobby.modal.description": "航海を始める前に目標を設定してください。",
+  "boarding.check": "搭乗チェック",
+  "boarding.routeBoarding": "{routeName} 航路に搭乗",
+  "boarding.missionLabel": "今回の航海のコア目標",
+  "boarding.missionPlaceholder": "例: 導入の3段落を完成する",
+  "boarding.cancel": "キャンセル",
+  "boarding.submit": "ドッキング完了（出航）",
+  "flight.badge.paused": "一時停止",
+  "flight.badge.cruising": "巡航中",
+  "flight.missionLabel": "今回の航海目標",
+  "flight.pause": "一時停止",
+  "flight.resume": "再開",
+  "flight.finish.debrief": "到着（振り返り）",
+  "flight.finish.end": "航海終了",
+  "flight.debrief.title": "今回の航海を整理しましょう",
+  "flight.debrief.description": "短く記録して航海ログに保存します。",
+  "debrief.page.title": "無事に軌道へ到着しました",
+  "debrief.page.description": "今回の航海を短く記録して締めくくりましょう。",
+  "debrief.status.label": "航海結果",
+  "debrief.option.completed.label": "目標を達成しました",
+  "debrief.option.completed.desc": "開始時に決めた目標を最後まで完了しました。",
+  "debrief.option.partial.label": "一部まで進めました",
+  "debrief.option.partial.desc": "重要な部分を進め、次の段階が残っています。",
+  "debrief.option.reoriented.label": "目標を再定義しました",
+  "debrief.option.reoriented.desc":
+    "進行中に目標範囲と優先順位を見直しました。",
+  "debrief.reflection.label": "今回の航海を終えて感じたこと",
+  "debrief.reflection.placeholder":
+    "例: 良かった点・難しかった点・気づきを短く残してください",
+  "debrief.save": "航海ログに保存",
+  "log.title": "私の航海記録",
+  "log.empty": "まだ記録された航海がありません。",
+  "log.firstVoyage": "最初の航海を始める",
+  "log.detail.back": "一覧へ戻る",
+  "log.detail.loadingOrNotFound": "読み込み中、または記録が見つかりません。",
+  "log.detail.statusTitle": "結果ステータス",
+  "log.detail.progressTitle": "確保できたこと",
+  "log.detail.nextActionTitle": "次の行動",
+  "log.detail.initialNoteTitle": "初期メモ",
+  "settings.title": "設定",
+  "settings.hideSeconds.title": "秒表示を隠す",
+  "settings.hideSeconds.description":
+    "タイマーを分表示のみにしてプレッシャーを減らします。",
+  "status.completed": "✅ 計画どおり",
+  "status.partial": "🌓 一部進行",
+  "status.reoriented": "🧭 方針再設定",
+  "status.aborted": "🚨 早期帰還",
+  "status.in_progress": "進行中",
+};
+
+export const I18N_MESSAGES: Record<Locale, I18nMessages> = {
+  ko: koMessages,
+  en: enMessages,
+  ja: jaMessages,
+};
+
+export type I18nKey = keyof I18nMessages;
+
+export type TranslationParams = Record<string, string | number>;
+
+const interpolateMessage = (
+  template: string,
+  params?: TranslationParams,
+): string => {
+  if (!params) return template;
+
+  return template.replace(/\{(\w+)\}/g, (_, paramKey) => {
+    const value = params[paramKey];
+    return value === undefined ? "" : String(value);
+  });
+};
+
+export const translateText = (
+  locale: Locale,
+  key: I18nKey | string,
+  params?: TranslationParams,
+  fallback = "",
+): string => {
+  const localeMessages = I18N_MESSAGES[locale] as Record<string, string>;
+  const defaultMessages = I18N_MESSAGES[DEFAULT_LOCALE] as Record<string, string>;
+  const template =
+    localeMessages[key] ?? defaultMessages[key] ?? fallback;
+
+  return interpolateMessage(template, params);
+};
+
+type DebriefStatusOption = "completed" | "partial" | "reoriented";
+
+export const DEBRIEF_STATUS_OPTIONS: Array<{
+  value: DebriefStatusOption;
+  labelKey: I18nKey;
+  descKey: I18nKey;
+}> = [
+  {
+    value: "completed",
+    labelKey: "debrief.option.completed.label",
+    descKey: "debrief.option.completed.desc",
+  },
+  {
+    value: "partial",
+    labelKey: "debrief.option.partial.label",
+    descKey: "debrief.option.partial.desc",
+  },
+  {
+    value: "reoriented",
+    labelKey: "debrief.option.reoriented.label",
+    descKey: "debrief.option.reoriented.desc",
+  },
+];
+
+export const VOYAGE_STATUS_LABEL_KEYS: Record<VoyageStatus, I18nKey> = {
+  completed: "status.completed",
+  partial: "status.partial",
+  reoriented: "status.reoriented",
+  aborted: "status.aborted",
+  in_progress: "status.in_progress",
+};

src/shared/config/routes.ts

@@ -3,23 +3,26 @@ import { Route } from '@/shared/types';
 export const ROUTES: Route[] = [
   {
     id: 'station',
-    name: '우주정거장',
     durationMinutes: 0,
-    tag: '대기/자유',
+    nameKey: 'routes.station.name',
-    description: '시간 제한 없이 머무를 수 있는 안전지대',
+    tagKey: 'routes.station.tag',
+    descriptionKey: 'routes.station.description',
   },
   {
     id: 'orion',
-    name: '오리온',
     durationMinutes: 60,
-    tag: '딥워크',
+    nameKey: 'routes.orion.name',
-    description: '60분 집중 항해',
+    tagKey: 'routes.orion.tag',
+    descriptionKey: 'routes.orion.description',
   },
   {
     id: 'gemini',
-    name: '쌍둥이자리',
     durationMinutes: 30,
-    tag: '숏스프린트',
+    nameKey: 'routes.gemini.name',
-    description: '30분 집중 항해',
+    tagKey: 'routes.gemini.tag',
+    descriptionKey: 'routes.gemini.description',
   },
 ];
+
+export const findRouteById = (routeId: string) =>
+  ROUTES.find((route) => route.id === routeId);

src/shared/types/index.ts

@@ -1,9 +1,9 @@
 export interface Route {
   id: string;
-  name: string;
   durationMinutes: number;
-  tag: string;
+  nameKey: string;
-  description: string;
+  tagKey: string;
+  descriptionKey: string;
 }
 
 export type VoyageStatus =

src/widgets/flight-hud/ui/FlightHudWidget.tsx

@@ -8,18 +8,12 @@ import {
   DialogHeader,
   DialogTitle,
 } from "@/components/ui/dialog";
+import { useI18n } from "@/features/i18n/model/useI18n";
+import { DEBRIEF_STATUS_OPTIONS } from "@/shared/config/i18n";
+import { findRouteById } from "@/shared/config/routes";
 import { saveCurrentVoyage, saveToHistory } from "@/shared/lib/store";
 import { Voyage, VoyageStatus } from "@/shared/types";
 
-const statusOptions: { value: VoyageStatus; label: string; desc: string }[] = [
-  { value: "completed", label: "계획대로", desc: "목표를 달성했습니다" },
-  { value: "partial", label: "부분 진행", desc: "절반의 성과를 만들었습니다" },
-  {
-    value: "reoriented",
-    label: "방향 재설정",
-    desc: "우선순위를 새로 정했습니다",
-  },
-];
 const FINISH_HOLD_MS = 1000;
 
 type FlightHudWidgetProps = {
@@ -39,6 +33,7 @@ export function FlightHudWidget({
   handlePauseToggle,
   handleFinish,
 }: FlightHudWidgetProps) {
+  const { t } = useI18n();
   const router = useRouter();
   const [isDebriefOpen, setIsDebriefOpen] = useState(false);
   const [finishedVoyage, setFinishedVoyage] = useState<Voyage | null>(null);
@@ -130,11 +125,21 @@ export function FlightHudWidget({
 
   if (!voyage) return null;
 
+  const route = findRouteById(voyage.routeId);
+  const routeName = route
+    ? t(route.nameKey, undefined, voyage.routeName)
+    : voyage.routeName;
+  const statusOptions = DEBRIEF_STATUS_OPTIONS.map((option) => ({
+    value: option.value as VoyageStatus,
+    label: t(option.labelKey),
+    desc: t(option.descKey),
+  }));
+
   return (
     <>
       <div className="absolute top-8 z-10 text-center">
         <span className="rounded-full border border-indigo-500/30 bg-indigo-950/50 px-4 py-1.5 text-xs font-medium uppercase tracking-widest text-indigo-300 shadow-[0_0_15px_rgba(99,102,241,0.3)] backdrop-blur">
-          {voyage.routeName} · {isPaused ? "일시정지" : "순항 중"}
+          {routeName} · {isPaused ? t("flight.badge.paused") : t("flight.badge.cruising")}
         </span>
       </div>
 
@@ -147,7 +152,7 @@ export function FlightHudWidget({
       <div className="relative z-10 mb-24 w-full max-w-2xl px-4">
         <section className="rounded-2xl border border-slate-600/60 bg-slate-950/55 p-4 text-left shadow-[0_16px_40px_rgba(2,6,23,0.35)] backdrop-blur md:p-6">
           <p className="text-[11px] font-semibold uppercase tracking-[0.24em] text-slate-400 md:text-xs">
-            이번 항해 목표
+            {t("flight.missionLabel")}
           </p>
           <p className="mt-2 max-h-32 overflow-y-auto break-words whitespace-pre-wrap pr-1 text-base leading-relaxed text-slate-100 md:text-lg">
             {voyage.missionText}
@@ -160,7 +165,7 @@ export function FlightHudWidget({
           onClick={handlePauseToggle}
           className="rounded-full border border-slate-600 bg-slate-900/50 px-8 py-3 text-sm font-bold uppercase tracking-wide text-slate-300 backdrop-blur transition-all hover:border-slate-400 hover:bg-slate-800/80 hover:text-white"
         >
-          {isPaused ? "다시 시작" : "일시정지"}
+          {isPaused ? t("flight.resume") : t("flight.pause")}
         </button>
         <div className="relative">
           <button
@@ -190,7 +195,9 @@ export function FlightHudWidget({
               style={{ transform: `scaleX(${holdProgress})` }}
             />
             <span className="relative z-10">
-              {isCountdownCompleted ? "도착 (회고)" : "항해 종료"}
+              {isCountdownCompleted
+                ? t("flight.finish.debrief")
+                : t("flight.finish.end")}
             </span>
           </button>
         </div>
@@ -200,34 +207,36 @@ export function FlightHudWidget({
         <DialogContent className="max-h-[90vh] overflow-y-auto border-slate-700/80 bg-slate-950 text-slate-100">
           <DialogHeader>
             <DialogTitle className="text-white">
-              이번 항해를 정리하세요
+              {t("flight.debrief.title")}
             </DialogTitle>
             <DialogDescription className="text-slate-400">
-              짧게 기록하고 항해일지에 저장합니다.
+              {t("flight.debrief.description")}
             </DialogDescription>
           </DialogHeader>
 
           <form onSubmit={handleDebriefSubmit} className="space-y-6">
             <section>
               <label className="mb-3 block text-sm font-medium text-slate-300">
-                항해 결과
+                {t("debrief.status.label")}
               </label>
-              <div className="grid grid-cols-1 gap-3 sm:grid-cols-3">
+              <div className="grid grid-cols-1 gap-3 md:grid-cols-3">
                 {statusOptions.map((opt) => (
                   <button
                     key={opt.value}
                     type="button"
                     onClick={() => setStatus(opt.value)}
-                    className={`rounded-xl border p-4 text-left transition-all ${
+                    className={`flex min-h-[116px] flex-col justify-between rounded-xl border px-4 py-3.5 text-left transition-all ${
                       status === opt.value
                         ? "border-indigo-500 bg-indigo-900/40 ring-1 ring-indigo-500"
                         : "border-slate-800 bg-slate-900/50 hover:bg-slate-800"
                     }`}
                   >
-                    <div className="mb-1 font-bold text-slate-200">
+                    <div className="text-sm leading-snug font-bold text-slate-200 break-keep">
                       {opt.label}
                     </div>
-                    <div className="text-xs text-slate-500">{opt.desc}</div>
+                    <div className="mt-2 text-[11px] leading-relaxed text-slate-500">
+                      {opt.desc}
+                    </div>
                   </button>
                 ))}
               </div>
@@ -235,13 +244,13 @@ export function FlightHudWidget({
 
             <section>
               <label className="mb-2 block text-sm font-medium text-slate-300">
-                이번 항해에서 확보한 것
+                {t("debrief.reflection.label")}
               </label>
               <input
                 type="text"
                 value={progress}
                 onChange={(event) => setProgress(event.target.value)}
-                placeholder="예: 기획안 목차 구성 완료"
+                placeholder={t("debrief.reflection.placeholder")}
                 className="w-full rounded-lg border border-slate-800 bg-slate-900/30 px-4 py-3 text-slate-200 outline-none transition-all focus:border-indigo-500 focus:ring-1 focus:ring-indigo-500"
               />
             </section>
@@ -252,14 +261,14 @@ export function FlightHudWidget({
                 onClick={() => setIsDebriefOpen(false)}
                 className="rounded-xl border border-slate-700 bg-slate-900/60 px-4 py-3 font-semibold text-slate-300 transition-colors hover:border-slate-500 hover:text-white"
               >
-                취소
+                {t("boarding.cancel")}
               </button>
               <button
                 type="submit"
                 disabled={!status}
                 className="rounded-xl bg-indigo-600 px-4 py-3 font-semibold text-white transition-colors hover:bg-indigo-500 disabled:bg-slate-800 disabled:text-slate-500"
               >
-                항해일지 저장
+                {t("debrief.save")}
               </button>
             </div>
           </form>

src/widgets/lobby-routes/ui/LobbyRoutesPanel.tsx

@@ -1,16 +1,17 @@
-import { useState } from 'react';
+import { useRouter } from "next/navigation";
-import { useRouter } from 'next/navigation';
+import { useState } from "react";
 
-import { BoardingMissionForm, startVoyage } from '@/features/boarding';
-import { useLobbyRedirect } from '@/features/lobby-session/model/useLobbyRedirect';
-import { ROUTES } from '@/shared/config/routes';
 import {
   Dialog,
   DialogContent,
   DialogDescription,
   DialogHeader,
   DialogTitle,
-} from '@/components/ui/dialog';
+} from "@/components/ui/dialog";
+import { BoardingMissionForm, startVoyage } from "@/features/boarding";
+import { useI18n } from "@/features/i18n/model/useI18n";
+import { useLobbyRedirect } from "@/features/lobby-session/model/useLobbyRedirect";
+import { ROUTES } from "@/shared/config/routes";
 
 function RouteCard({
   route,
@@ -21,58 +22,62 @@ function RouteCard({
   isCTA?: boolean;
   onLaunch: (route: (typeof ROUTES)[number]) => void;
 }) {
+  const { t } = useI18n();
+
   return (
     <div
-      className={`group relative flex h-full flex-col rounded-2xl border border-slate-800 bg-slate-900/60 p-6 shadow-lg backdrop-blur-md transition-all duration-300 hover:border-indigo-500/50 hover:bg-slate-800/80 hover:shadow-indigo-900/20 ${isCTA ? 'min-h-[200px] items-center justify-center text-center' : ''}`}
+      className={`group relative flex h-full flex-col rounded-2xl border border-slate-800 bg-slate-900/60 p-6 shadow-lg backdrop-blur-md transition-all duration-300 hover:border-indigo-500/50 hover:bg-slate-800/80 hover:shadow-indigo-900/20 ${isCTA ? "min-h-[200px] items-center justify-center text-center" : ""}`}
     >
       <div
-        className={`relative z-10 flex w-full ${isCTA ? 'flex-col items-center gap-4' : 'mb-4 items-start justify-between'}`}
+        className={`relative z-10 flex w-full ${isCTA ? "flex-col items-center gap-4" : "mb-4 items-start justify-between"}`}
       >
-        <div className={isCTA ? 'flex flex-col items-center' : ''}>
+        <div className={isCTA ? "flex flex-col items-center" : ""}>
           <h3
-            className={`font-bold text-indigo-100 transition-colors group-hover:text-white ${isCTA ? 'text-3xl' : 'text-xl'}`}
+            className={`font-bold text-indigo-100 transition-colors group-hover:text-white ${isCTA ? "text-3xl" : "text-xl"}`}
           >
-            {route.name}
+            {t(route.nameKey, undefined, route.id)}
           </h3>
           <span className="mt-2 inline-block rounded-full border border-slate-800 bg-slate-950/50 px-2 py-0.5 text-xs font-medium text-slate-400">
-            {route.tag}
+            {t(route.tagKey)}
           </span>
         </div>
-
+        {route.durationMinutes !== 0 && (
-        <span
+          <span
-          className={`font-light text-slate-300 transition-colors group-hover:text-white ${isCTA ? 'mt-2 text-4xl' : 'text-3xl'}`}
+            className={`font-light text-slate-300 transition-colors group-hover:text-white ${isCTA ? "mt-2 text-4xl" : "text-3xl"}`}
-        >
+          >
-          {route.durationMinutes === 0 ? '∞' : route.durationMinutes}
+            {route.durationMinutes !== 0 && route.durationMinutes}
-          <span className="ml-1 text-sm text-slate-500">
+            <span className="ml-1 text-sm text-slate-500">
-            {route.durationMinutes === 0 ? '' : 'min'}
+              {route.durationMinutes !== 0 && t("common.minuteShort")}
+            </span>
           </span>
-        </span>
+        )}
       </div>
 
       {!isCTA && (
         <p className="relative z-10 mb-8 w-full flex-1 text-left text-sm leading-relaxed text-slate-400">
-          {route.description}
+          {t(route.descriptionKey)}
         </p>
       )}
 
       {isCTA && (
-        <p className="relative z-10 mb-6 max-w-lg text-base text-slate-400">
+        <p className="relative z-10 mt-2 mb-6 max-w-lg text-left text-base text-slate-400">
-          {route.description}
+          {t(route.descriptionKey)}
         </p>
       )}
 
       <button
         type="button"
         onClick={() => onLaunch(route)}
-        className={`relative z-10 flex items-center justify-center rounded-xl bg-indigo-600 font-bold text-white shadow-lg shadow-indigo-900/30 transition-all hover:bg-indigo-500 active:scale-[0.98] ${isCTA ? 'w-full max-w-md py-4 text-lg' : 'w-full py-4'}`}
+        className={`relative z-10 flex items-center justify-center rounded-xl bg-indigo-600 font-bold text-white shadow-lg shadow-indigo-900/30 transition-all hover:bg-indigo-500 active:scale-[0.98] ${isCTA ? "w-full max-w-md py-4 text-lg" : "w-full py-4"}`}
       >
-        {isCTA ? '정거장 진입 (대기)' : '바로 출항'}
+        {isCTA ? t("lobby.cta.station") : t("lobby.cta.launch")}
       </button>
     </div>
   );
 }
 
 export function LobbyRoutesPanel() {
+  const { t } = useI18n();
   useLobbyRedirect();
   const router = useRouter();
   const [selectedRouteId, setSelectedRouteId] = useState<string | null>(null);
@@ -92,31 +97,40 @@ export function LobbyRoutesPanel() {
     const started = startVoyage({
       route: selectedRoute,
       mission,
+      routeName: t(selectedRoute.nameKey, undefined, selectedRoute.id),
     });
 
     if (!started) return;
 
     setIsBoardingOpen(false);
-    router.push('/flight');
+    router.push("/flight");
   };
 
   return (
     <div className="relative z-10 flex min-h-[calc(100vh-80px)] flex-col items-center justify-center p-6 md:p-12">
       <div className="mx-auto mb-12 max-w-2xl space-y-4 rounded-3xl border border-slate-800/30 bg-slate-950/30 p-6 text-center backdrop-blur-sm">
         <h1 className="text-3xl font-bold tracking-tight text-slate-100 md:text-5xl">
-          어느 별자리로 출항할까요?
+          {t("lobby.title")}
         </h1>
-        <p className="text-lg text-slate-300">몰입하기 좋은 궤도입니다.</p>
+        <p className="text-lg text-slate-300">{t("lobby.subtitle")}</p>
       </div>
 
       <div className="mx-auto flex w-full max-w-4xl flex-col gap-6">
         <div className="w-full">
-          <RouteCard route={stationRoute} isCTA={true} onLaunch={handleOpenBoarding} />
+          <RouteCard
+            route={stationRoute}
+            isCTA={true}
+            onLaunch={handleOpenBoarding}
+          />
         </div>
 
         <div className="grid w-full grid-cols-1 gap-6 md:grid-cols-2">
           {normalRoutes.map((route) => (
-            <RouteCard key={route.id} route={route} onLaunch={handleOpenBoarding} />
+            <RouteCard
+              key={route.id}
+              route={route}
+              onLaunch={handleOpenBoarding}
+            />
           ))}
         </div>
       </div>
@@ -128,13 +142,15 @@ export function LobbyRoutesPanel() {
         >
           <DialogHeader className="mb-2">
             <h2 className="mb-1 text-sm font-semibold uppercase tracking-widest text-indigo-400">
-              Boarding Check
+              {t("lobby.modal.boardingCheck")}
             </h2>
             <DialogTitle className="text-2xl font-bold text-white">
-              {selectedRoute.name} 항로 탑승
+              {t("lobby.modal.routeBoarding", {
+                routeName: t(selectedRoute.nameKey, undefined, selectedRoute.id),
+              })}
             </DialogTitle>
             <DialogDescription className="text-slate-400">
-              항해를 시작하기 전에 목표를 설정하세요.
+              {t("lobby.modal.description")}
             </DialogDescription>
           </DialogHeader>