[test] 로그인 테스트를 위해 잠시 올림

src/app/design-system/page.tsx

@@ -77,7 +77,7 @@ function Page() {
           <div className="flex gap-2">
             <button
               className="px-4 py-2 bg-green-300 text-black rounded"
-              onClick={() => customToast.success('성공 메시지')}
+              onClick={() => customToast.success('성공 메시지 \n 줄바꿈은 이렇게')}
             >
               Success Toast
             </button>

src/app/login/SocialLogin.tsx

@@ -4,11 +4,10 @@ import Naver from '@/shared/assets/icons/naver.svg';
 import Kakao from '@/shared/assets/icons/kakao.svg';
 import Google from '@/shared/assets/icons/google.svg';
 import tw from '@/shared/utills/tw';
-import Welcome from './Welcome';
-import { useState } from 'react';
+import { useAuthStore } from '@/shared/@store/auth';
 
 function SocialLogin() {
-  const [isModalOpen, setIsModalOpen] = useState(false);
+  const { loginWithProvider } = useAuthStore();
 
   const socialButtons = [
     {
@@ -33,8 +32,7 @@ function SocialLogin() {
 
   // TODO: 백엔드 연동 로직 구현 필요
   const handleLogin = (id: string) => {
-    console.log(id);
-    setIsModalOpen(true);
+    loginWithProvider(id as 'naver' | 'kakao' | 'google');
   };
 
   return (
@@ -52,9 +50,6 @@ function SocialLogin() {
           </button>
         ))}
       </div>
-
-      {/* 웰컴 모달 (임시) */}
-      <Welcome open={isModalOpen} onClose={() => setIsModalOpen(false)} />
     </>
   );
 }

src/app/login/first-user/page.tsx

@@ -0,0 +1,7 @@
+import LoginRedirectHandler from '@/shared/components/auth/LoginRedirectHandler';
+
+function Page() {
+  return <LoginRedirectHandler />;
+}
+
+export default Page;

src/app/login/page.tsx

@@ -15,7 +15,13 @@ function Page() {
         className="absolute bottom-0 left-1/2 -translate-x-1/2 w-full max-w-[75rem] h-full -z-10"
         aria-hidden
       >
-        <Image src={loginBg} alt="" fill className="object-cover md:object-contain object-bottom" />
+        <Image
+          src={loginBg}
+          alt=""
+          fill
+          priority
+          className="object-cover md:object-contain object-bottom"
+        />
       </div>
 
       <div className="flex flex-col gap-3 text-center">

src/app/login/success/page.tsx

@@ -0,0 +1,6 @@
+import LoginRedirectHandler from '@/shared/components/auth/LoginRedirectHandler';
+
+function Page() {
+  return <LoginRedirectHandler />;
+}
+export default Page;

src/shared/@store/auth.ts

@@ -0,0 +1,83 @@
+import { create } from 'zustand';
+import { customToast } from '../components/toast/CustomToastUtils';
+
+interface User {
+  id: string;
+  email: string;
+  nickname: string;
+  isFirstLogin: boolean;
+  abv_degree?: number;
+  provider?: 'naver' | 'kakao' | 'google';
+}
+
+interface AuthState {
+  user: User | null;
+  accessToken: string | null;
+  isLoggedIn: boolean;
+  setUser: (user: User, token: string) => void;
+  logout: () => Promise<void>;
+  loginWithProvider: (provider: User['provider']) => void;
+
+  updateUser: () => Promise<User | null>;
+}
+
+export const useAuthStore = create<AuthState>((set) => ({
+  user: null,
+  accessToken: null,
+  isLoggedIn: false,
+
+  loginWithProvider: (provider) => {
+    window.location.href = `http://localhost:8080/oauth2/authorization/${provider}`;
+  },
+
+  setUser: (user, token) => {
+    const updatedUser = { ...user, abv_degree: 5.0 };
+    set({ user: updatedUser, accessToken: token, isLoggedIn: true });
+
+    customToast.success(`${updatedUser.nickname}님, 로그인 성공 🎉`);
+  },
+
+  logout: async () => {
+    try {
+      await fetch('http://localhost:8080/user/auth/logout', {
+        method: 'POST',
+        credentials: 'include',
+      });
+
+      customToast.success('로그아웃 되었습니다.');
+      set({ user: null, accessToken: null, isLoggedIn: false });
+    } catch (err) {
+      customToast.error('로그아웃 실패❌ \n 다시 시도해주세요.');
+      console.error('로그아웃 실패', err);
+    }
+  },
+
+  updateUser: async () => {
+    try {
+      const res = await fetch('http://localhost:8080/user/auth/refresh', {
+        method: 'POST',
+        credentials: 'include',
+        headers: { 'Content-Type': 'application/json' },
+      });
+
+      if (!res.ok) throw new Error('토큰 갱신 실패');
+      const data = await res.json();
+
+      console.log('updateUser response:', data);
+      const userInfo = data?.data?.user;
+      const accessToken = data?.data?.accessToken;
+
+      if (userInfo && accessToken) {
+        set({ user: userInfo, accessToken, isLoggedIn: true });
+        console.log('토큰 및 유저 정보 갱신 완료:', userInfo);
+        return userInfo;
+      }
+
+      return null;
+    } catch (err) {
+      console.error('updateUser 실패', err);
+      set({ accessToken: null, user: null, isLoggedIn: false });
+      return null;
+    }
+  },
+}));

src/shared/@store/modal.ts

@@ -0,0 +1,33 @@
+import { create } from 'zustand';
+
+interface WelcomeModalData {
+  open: boolean;
+  nickname: string;
+}
+
+interface LogoutConfirmModalData {
+  open: boolean;
+}
+
+interface ModalStore {
+  welcomeModal: WelcomeModalData;
+  logoutConfirmModal: LogoutConfirmModalData;
+
+  openWelcomeModal: (nickname: string) => void;
+  closeWelcomeModal: () => void;
+
+  openLogoutConfirmModal: () => void;
+  closeLogoutConfirmModal: () => void;
+}
+
+export const useModalStore = create<ModalStore>((set) => ({
+  welcomeModal: { open: false, nickname: '' },
+  logoutConfirmModal: { open: false },
+
+  openWelcomeModal: (nickname: string) => set({ welcomeModal: { open: true, nickname } }),
+
+  closeWelcomeModal: () => set({ welcomeModal: { open: false, nickname: '' } }),
+
+  openLogoutConfirmModal: () => set({ logoutConfirmModal: { open: true } }),
+  closeLogoutConfirmModal: () => set({ logoutConfirmModal: { open: false } }),
+}));

src/shared/components/auth/LoginConfirm.tsx

@@ -0,0 +1,4 @@
+function LoginConfirm() {
+  return <div>LoginConfirm</div>;
+}
+export default LoginConfirm;

src/shared/components/auth/LoginRedirectHandler.tsx

@@ -0,0 +1,55 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+import { usePathname, useRouter } from 'next/navigation';
+import { useAuthStore } from '@/shared/@store/auth';
+import { useModalStore } from '@/shared/@store/modal';
+import { customToast } from '@/shared/components/toast/CustomToastUtils';
+import Spinner from '../spinner/Spinner';
+
+function LoginRedirectHandler() {
+  const pathname = usePathname();
+  const router = useRouter();
+  const { user, updateUser } = useAuthStore();
+  const { openWelcomeModal } = useModalStore();
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    if (!user && loading) {
+      updateUser()
+        .then((fetchedUser) => {
+          if (!fetchedUser) {
+            router.replace('/login');
+          }
+        })
+        .catch(() => {
+          router.replace('/login');
+        })
+        .finally(() => setLoading(false));
+    }
+  }, [user, loading, updateUser, router]);
+
+  useEffect(() => {
+    if (!user || loading) return;
+
+    const preLoginPath = sessionStorage.getItem('preLoginPath') || '/';
+
+    if (pathname.startsWith('/login/first-user')) {
+      openWelcomeModal(user.nickname);
+    } else if (pathname.startsWith('/login/success')) {
+      customToast.success(`${user.nickname}님 \n 로그인 성공 🎉`);
+      router.replace(preLoginPath);
+    }
+  }, [pathname, user, router, openWelcomeModal, loading]);
+
+  if (loading) {
+    return (
+      <div className="page-layout max-w-824 flex-center">
+        <Spinner />
+      </div>
+    );
+  }
+
+  return null;
+}
+export default LoginRedirectHandler;

src/app/login/Welcome.tsx → src/shared/components/auth/Welcome.tsx

@@ -6,28 +6,29 @@ import Button from '@/shared/components/button/Button';
 import ModalLayout from '@/shared/components/modalPop/ModalLayout';
 import Ssury from '@/shared/assets/ssury/ssury_jump.webp';
 import { useRouter } from 'next/navigation';
+import { useModalStore } from '@/shared/@store/modal';
+import { useAuthStore } from '@/shared/@store/auth';
 
-interface Props {
-  open: boolean;
-  onClose: () => void;
-}
-
-function Welcome({ open, onClose }: Props) {
+function Welcome() {
   const router = useRouter();
+  const { user } = useAuthStore();
+  const { welcomeModal, closeWelcomeModal } = useModalStore();
+
+  if (!welcomeModal.open || !user) return null;
 
   return (
     <ModalLayout
-      open={open}
-      onClose={onClose}
-      title="환영합니다!"
+      open={welcomeModal.open}
+      onClose={closeWelcomeModal}
+      title={`환영합니다, ${user.nickname}님!`}
       description="바텐더 쑤리가 안내해드릴게요"
       buttons={
         <>
           <Button
             type="button"
             color="purple"
             onClick={() => {
-              onClose();
+              closeWelcomeModal();
               router.push('/recipe');
             }}
           >
@@ -36,7 +37,7 @@ function Welcome({ open, onClose }: Props) {
           <Button
             type="button"
             onClick={() => {
-              onClose();
+              closeWelcomeModal();
               router.push('/recommend');
             }}
           >

src/shared/components/header/DropdownMenu.tsx

@@ -6,6 +6,7 @@ import Link from 'next/link';
 import { usePathname } from 'next/navigation';
 import { useEffect, useRef } from 'react';
 import gsap from 'gsap';
+import { useAuthStore } from '@/shared/@store/auth';
 
 interface Props {
   isClicked: boolean;
@@ -17,6 +18,8 @@ function DropdownMenu({ isClicked, setIsClicked }: Props) {
   const menuRef = useRef<HTMLDivElement>(null);
   const textRef = useRef<(HTMLSpanElement | null)[]>([]);
 
+  const { isLoggedIn, logout } = useAuthStore();
+
   useEffect(() => {
     if (!menuRef.current) return;
 
@@ -100,25 +103,40 @@ function DropdownMenu({ isClicked, setIsClicked }: Props) {
         ))}
       </ul>
 
-      <section
-        aria-label="로그인 로그아웃"
-        className="border border-t-[1px] border-t-gray flex items-center py-[32px] gap-2"
-      >
-        <User color="var(--color-primary)" />
-        <button type="button" className="text-black font-light text-xl hover:text-black/70">
-          로그인/회원가입
-        </button>
-      </section>
+      <div className="border border-t-[1px] border-t-gray flex items-center py-[32px] gap-2">
+        {isLoggedIn ? (
+          <button
+            type="button"
+            onClick={logout}
+            className="flex items-center gap-2 text-black font-light text-xl hover:text-black/70"
+          >
+            <User color="var(--color-primary)" aria-hidden />
+            <span>로그아웃</span>
+          </button>
+        ) : (
+          <Link
+            href="/login"
+            onNavigate={() => {
+              setIsClicked(false);
+              sessionStorage.setItem('preLoginPath', window.location.pathname);
+            }}
+            className="flex items-center gap-2 text-black font-light text-xl hover:text-black/70"
+          >
+            <User color="var(--color-primary)" aria-hidden />
+            <span>로그인/회원가입</span>
+          </Link>
+        )}
+      </div>
 
       <div className="absolute top-1.5 left-3">
         <button
           type="button"
-          aria-label="모바일 메뉴 닫기"
+          aria-label="메인 네비게이션 메뉴 닫기"
           onClick={() => {
             setIsClicked(false);
           }}
         >
-          <Close color="var(--color-primary)" className="w-8 h-8" />
+          <Close color="var(--color-primary)" className="w-8 h-8" aria-hidden />
         </button>
       </div>
     </nav>

src/shared/components/header/HamburgerMenu.tsx

@@ -14,7 +14,7 @@ function HamburgerMenu() {
     <>
       <button
         type="button"
-        className="sm:hidden block stroke-white hover:stroke-white/80 w-[63px]"
+        className="sm:hidden block stroke-white hover:stroke-white/80"
         onClick={(e) => handleClick(e)}
         aria-label="메뉴 열기"
         aria-expanded={isClicked}