From cfecb3d834754b91976446b7df3a2a930f9131dd Mon Sep 17 00:00:00 2001
From: ParkWonYeop <pwy9679@gnu.ac.kr>
Date: Sat, 27 Dec 2025 22:17:44 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20=EA=B2=80=EC=83=89=20=EA=B8=B0=EB=8A=A5?=
 =?UTF-8?q?=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/api/posts.ts                   |   9 +-
 src/app/category/[id]/page.tsx     | 123 +++++++++++------
 src/app/page.tsx                   | 214 ++++++++++++++++++-----------
 src/components/layout/Sidebar.tsx  |  52 +++++--
 src/components/post/PostSearch.tsx |  69 ++++++++++
 5 files changed, 327 insertions(+), 140 deletions(-)
 create mode 100644 src/components/post/PostSearch.tsx

diff --git a/src/api/posts.ts b/src/api/posts.ts
index 5fc2bd0..da783d2 100644
--- a/src/api/posts.ts
+++ b/src/api/posts.ts
@@ -8,7 +8,7 @@ export const getPosts = async (params?: {
   keyword?: string; 
   category?: string; 
   tag?: string; 
-  sort?: string; // 🆕 정렬 옵션 추가 (예: 'viewCount,desc')
+  sort?: string; 
 }) => {
   const response = await http.get<ApiResponse<PostListResponse>>('/api/posts', {
     params: {
@@ -20,12 +20,13 @@ export const getPosts = async (params?: {
   return response.data.data;
 };
 
-// 2. 카테고리별 게시글 조회
-export const getPostsByCategory = async (categoryName: string, page = 0, size = 10) => {
+// 2. 카테고리별 게시글 조회 (🛠️ keyword 파라미터 추가)
+export const getPostsByCategory = async (categoryName: string, page = 0, size = 10, keyword?: string) => {
   return getPosts({ 
     page, 
     size, 
-    category: categoryName 
+    category: categoryName,
+    keyword // 🆕 검색어 전달
   });
 };
 
diff --git a/src/app/category/[id]/page.tsx b/src/app/category/[id]/page.tsx
index 11cb109..5d09b59 100644
--- a/src/app/category/[id]/page.tsx
+++ b/src/app/category/[id]/page.tsx
@@ -2,11 +2,11 @@
 
 import { use, useState, useEffect } from 'react';
 import { useQuery } from '@tanstack/react-query';
-import { getPostsByCategory } from '@/api/posts';
+import { getPostsByCategory } from '@/api/posts'; // 🛠️ 수정된 API 사용
 import PostCard from '@/components/post/PostCard';
-import PostListItem from '@/components/post/PostListItem'; 
-import { Loader2, ChevronLeft, ChevronRight, LayoutGrid, List } from 'lucide-react';
-import { notFound } from 'next/navigation';
+import PostListItem from '@/components/post/PostListItem';
+import PostSearch from '@/components/post/PostSearch'; // 🆕 검색 컴포넌트
+import { Loader2, ChevronLeft, ChevronRight, LayoutGrid, List, Search as SearchIcon } from 'lucide-react';
 import { clsx } from 'clsx';
 
 export default function CategoryPage({ params }: { params: Promise<{ id: string }> }) {
@@ -14,39 +14,45 @@ export default function CategoryPage({ params }: { params: Promise<{ id: string
   const categoryName = decodeURIComponent(id);
   const apiCategoryName = categoryName === 'uncategorized' ? '미분류' : categoryName;
   
-  // 📢 공지 카테고리인지 판별
   const isNoticeCategory = apiCategoryName === '공지' || apiCategoryName.toLowerCase() === 'notice';
 
   const [page, setPage] = useState(0);
-  
-  // 공지사항이면 기본값을 'list'로 설정
+  const [keyword, setKeyword] = useState(''); // 🆕 검색어 상태
   const [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');
   const PAGE_SIZE = 10;
 
   useEffect(() => {
-    // 📢 공지 카테고리는 강제로 리스트 뷰 적용
     if (isNoticeCategory) {
       setViewMode('list');
       return;
     }
-
-    // 그 외에는 로컬 스토리지 설정 따름
     const savedMode = localStorage.getItem('postViewMode') as 'grid' | 'list';
     if (savedMode) setViewMode(savedMode);
   }, [isNoticeCategory]);
 
   const handleViewModeChange = (mode: 'grid' | 'list') => {
     setViewMode(mode);
-    // 공지 카테고리가 아닐 때만 사용자 설정을 저장 (공지는 뷰 강제이므로 저장 안 함)
     if (!isNoticeCategory) {
       localStorage.setItem('postViewMode', mode);
     }
   };
 
+  // 🆕 검색어가 변경되면 페이지를 0으로 초기화
+  const handleSearch = (newKeyword: string) => {
+    setKeyword(newKeyword);
+    setPage(0);
+  };
+
   const { data: postsData, isLoading, error, isPlaceholderData } = useQuery({
-    queryKey: ['posts', 'category', apiCategoryName, page],
-    queryFn: () => getPostsByCategory(apiCategoryName, page, PAGE_SIZE),
-    placeholderData: (previousData) => previousData,
+    queryKey: ['posts', 'category', apiCategoryName, page, keyword], // 🔑 쿼리 키에 keyword 추가
+    queryFn: () => getPostsByCategory(apiCategoryName, page, PAGE_SIZE, keyword), // 🆕 검색어 전달
+    // 🛠️ 수정됨: 검색어가 바뀌면 이전 데이터를 보여주지 않고 로딩 상태로 전환
+    // (페이지 이동 시에는 부드럽게 보여주기 위해 유지)
+    placeholderData: (previousData, previousQuery) => {
+        const prevKeyword = previousQuery?.queryKey[4];
+        if (prevKeyword !== keyword) return undefined;
+        return previousData;
+    },
   });
 
   if (isLoading || (postsData === undefined && !error)) {
@@ -68,49 +74,80 @@ export default function CategoryPage({ params }: { params: Promise<{ id: string
 
   const posts = postsData?.content || [];
 
+  // 🛠️ 백엔드 PagedModel 구조 대응 (page 필드 내부에 메타데이터가 있을 수 있음)
+  // postsData가 any로 캐스팅되어 안전하게 접근
+  const pagingData = (postsData as any)?.page || postsData;
+  const totalElements = pagingData?.totalElements ?? 0;
+  const totalPages = pagingData?.totalPages ?? 0;
+  // page.number가 존재하면 계산해서 isLast 판단, 아니면 기존 last 필드 사용
+  const isLast = pagingData?.number !== undefined 
+    ? (pagingData.number + 1 >= pagingData.totalPages) 
+    : (postsData?.last ?? true);
+
   const handlePrevPage = () => setPage((old) => Math.max(old - 1, 0));
   const handleNextPage = () => {
-    if (!postsData?.last) {
+    if (!isLast) {
       setPage((old) => old + 1);
     }
   };
 
   return (
     <div className="max-w-4xl mx-auto px-4 py-8">
-      {/* 헤더 영역 수정 */}
-      <div className="flex items-center justify-between mb-6">
-        <h1 className="text-2xl font-bold text-gray-800 flex items-baseline gap-2">
+      {/* 헤더 영역 */}
+      <div className="flex flex-col md:flex-row md:items-center justify-between mb-8 gap-4">
+        <h1 className="text-2xl font-bold text-gray-800 flex items-baseline gap-2 shrink-0">
           {apiCategoryName} <span className="text-gray-400 text-lg font-normal">글 목록</span>
         </h1>
 
-        {/* 뷰 모드 버튼 */}
-        <div className="flex items-center gap-1 bg-gray-100 p-1 rounded-lg">
-          <button
-            onClick={() => handleViewModeChange('grid')}
-            className={clsx(
-              "p-2 rounded-md transition-all duration-200",
-              viewMode === 'grid' ? "bg-white text-blue-600 shadow-sm" : "text-gray-400 hover:text-gray-600"
-            )}
-            title="카드형 보기"
-          >
-            <LayoutGrid size={18} />
-          </button>
-          <button
-            onClick={() => handleViewModeChange('list')}
-            className={clsx(
-              "p-2 rounded-md transition-all duration-200",
-              viewMode === 'list' ? "bg-white text-blue-600 shadow-sm" : "text-gray-400 hover:text-gray-600"
-            )}
-            title="리스트형 보기"
-          >
-            <List size={18} />
-          </button>
+        <div className="flex items-center gap-3 w-full md:w-auto">
+          {/* 🔍 카테고리 내 검색바 */}
+          <PostSearch 
+            onSearch={handleSearch} 
+            placeholder={`'${apiCategoryName}' 내 검색`} 
+            className="w-full md:w-64"
+          />
+
+          {/* 뷰 모드 버튼 */}
+          <div className="flex items-center gap-1 bg-gray-100 p-1 rounded-lg shrink-0">
+            <button
+              onClick={() => handleViewModeChange('grid')}
+              className={clsx(
+                "p-2 rounded-md transition-all duration-200",
+                viewMode === 'grid' ? "bg-white text-blue-600 shadow-sm" : "text-gray-400 hover:text-gray-600"
+              )}
+              title="카드형 보기"
+            >
+              <LayoutGrid size={18} />
+            </button>
+            <button
+              onClick={() => handleViewModeChange('list')}
+              className={clsx(
+                "p-2 rounded-md transition-all duration-200",
+                viewMode === 'list' ? "bg-white text-blue-600 shadow-sm" : "text-gray-400 hover:text-gray-600"
+              )}
+              title="리스트형 보기"
+            >
+              <List size={18} />
+            </button>
+          </div>
         </div>
       </div>
 
+      {/* 검색 결과 안내 (검색 중일 때만 표시) */}
+      {keyword && (
+        <div className="mb-6 flex items-center gap-2 text-sm text-gray-600 bg-blue-50 px-4 py-3 rounded-lg border border-blue-100">
+          <SearchIcon size={16} className="text-blue-500" />
+          <span>
+            "{keyword}" 검색 결과: <strong>{totalElements}</strong>건
+          </span>
+        </div>
+      )}
+
       {posts.length === 0 ? (
         <div className="text-center py-20 bg-gray-50 rounded-lg border border-gray-100">
-          <p className="text-gray-400 mb-2">아직 작성된 글이 없습니다.</p>
+          <p className="text-gray-400 mb-2">
+            {keyword ? `"${keyword}"에 대한 검색 결과가 없습니다.` : '아직 작성된 글이 없습니다.'}
+          </p>
         </div>
       ) : (
         <>
@@ -139,12 +176,12 @@ export default function CategoryPage({ params }: { params: Promise<{ id: string
             </button>
             
             <span className="text-sm font-medium text-gray-600">
-              Page <span className="text-gray-900 font-bold">{page + 1}</span> {postsData && postsData.totalPages > 0 && `/ ${postsData.totalPages}`}
+              Page <span className="text-gray-900 font-bold">{page + 1}</span> {totalPages > 0 && `/ ${totalPages}`}
             </span>
 
             <button
               onClick={handleNextPage}
-              disabled={postsData?.last || isPlaceholderData}
+              disabled={isLast || isPlaceholderData}
               className="p-2 rounded-full hover:bg-gray-100 disabled:opacity-30 disabled:hover:bg-transparent transition-colors disabled:cursor-not-allowed"
               aria-label="다음 페이지"
             >
diff --git a/src/app/page.tsx b/src/app/page.tsx
index d63f53b..fa3752b 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -1,33 +1,48 @@
 'use client';
 
+import { useState, Suspense } from 'react';
 import { useQuery } from '@tanstack/react-query';
+import { useRouter, useSearchParams } from 'next/navigation';
 import { getPosts } from '@/api/posts';
 import PostCard from '@/components/post/PostCard';
 import PostListItem from '@/components/post/PostListItem';
+// PostSearch 컴포넌트 제거 (사이드바로 이동)
 import { Post } from '@/types';
-import { Loader2, Megaphone, Flame, Clock, ChevronRight } from 'lucide-react';
+import { Loader2, Megaphone, Flame, Clock, ChevronRight, Search as SearchIcon } from 'lucide-react';
 import Link from 'next/link';
 
-export default function Home() {
-  // 1. 공지사항 조회 (최대 3개, 최신순)
+function HomeContent() {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  
+  // URL 쿼리 스트링에서 검색어 가져오기
+  const keyword = searchParams.get('keyword') || '';
+
+  // 1. 공지사항 조회
   const { data: noticesData, isLoading: isNoticesLoading } = useQuery({
     queryKey: ['posts', 'notices'],
     queryFn: () => getPosts({ category: '공지', size: 3, sort: 'createdAt,desc' }),
   });
 
-  // 2. 최신 게시글 조회 (넉넉히 10개 가져와서 공지 제외하고 3개만 사용)
+  // 2. 최신 게시글 조회
   const { data: latestData, isLoading: isLatestLoading } = useQuery({
     queryKey: ['posts', 'latest'],
     queryFn: () => getPosts({ size: 10, sort: 'createdAt,desc' }),
   });
 
-  // 3. 인기 게시글 조회 (조회수순, 넉넉히 10개 가져와서 공지 제외하고 3개만 사용)
+  // 3. 인기 게시글 조회
   const { data: popularData, isLoading: isPopularLoading } = useQuery({
     queryKey: ['posts', 'popular'],
     queryFn: () => getPosts({ size: 10, sort: 'viewCount,desc' }),
   });
 
-  // 로딩 상태 처리
+  // 4. 검색 결과 조회
+  const { data: searchData, isLoading: isSearchLoading } = useQuery({
+    queryKey: ['posts', 'search', keyword],
+    queryFn: () => getPosts({ keyword, size: 20 }),
+    enabled: !!keyword,
+  });
+
   if (isNoticesLoading || isLatestLoading || isPopularLoading) {
     return (
       <div className="flex justify-center items-center h-screen">
@@ -36,7 +51,6 @@ export default function Home() {
     );
   }
 
-  // 데이터 필터링 헬퍼 함수
   const filterPosts = (posts: Post[] | undefined, limit: number) => {
     if (!posts) return [];
     return posts
@@ -45,88 +59,126 @@ export default function Home() {
   };
 
   const notices = noticesData?.content || [];
-  // 5개 -> 3개로 수정
   const latestPosts = filterPosts(latestData?.content, 3);
   const popularPosts = filterPosts(popularData?.content, 3);
+  
+  const searchResults = searchData?.content || [];
+  const searchMeta = (searchData as any)?.page || searchData;
+  const searchTotalElements = searchMeta?.totalElements ?? 0;
 
   return (
-    <main className="max-w-4xl mx-auto px-4 py-8 space-y-16">
+    <main className="max-w-4xl mx-auto px-4 py-8 space-y-12">
       
-      {/* 📢 1. 공지사항 섹션 (리스트 형태) */}
-      {notices.length > 0 && (
-        <section className="animate-in fade-in slide-in-from-bottom-4 duration-500">
-          <div className="flex items-center gap-2 mb-4 pb-2 border-b border-gray-100">
-            <Megaphone className="text-red-500" size={20} />
-            <h2 className="text-xl font-bold text-gray-800">공지사항</h2>
-          </div>
-          <div className="flex flex-col gap-2">
-            {notices.map((post) => (
-              <PostListItem key={post.id} post={post} />
-            ))}
+      {/* 🅰️ 검색 모드: 검색어가 있을 때 표시 */}
+      {keyword ? (
+        <section className="animate-in fade-in slide-in-from-bottom-2 duration-300">
+          <div className="flex items-center gap-2 mb-6 border-b border-gray-100 pb-4">
+            <SearchIcon className="text-blue-500" size={24} />
+            <h2 className="text-xl font-bold text-gray-800">
+              "{keyword}" 검색 결과 <span className="text-blue-600 text-lg ml-1">{searchTotalElements}</span>건
+            </h2>
           </div>
+
+          {isSearchLoading ? (
+            <div className="py-20 flex justify-center"><Loader2 className="animate-spin text-blue-500" /></div>
+          ) : searchResults.length > 0 ? (
+            <div className="flex flex-col gap-0 border-t border-gray-100">
+              {searchResults.map((post) => (
+                <PostListItem key={post.id} post={post} />
+              ))}
+            </div>
+          ) : (
+            <div className="text-center py-20 bg-gray-50 rounded-xl text-gray-400">
+              검색 결과가 없습니다.
+            </div>
+          )}
         </section>
+      ) : (
+        /* 🅱️ 대시보드 모드: 검색어가 없을 때 기존 화면 표시 */
+        <div className="space-y-16 animate-in fade-in duration-500">
+          {/* 공지사항 섹션 */}
+          {notices.length > 0 && (
+            <section>
+              <div className="flex items-center gap-2 mb-4 pb-2 border-b border-gray-100">
+                <Megaphone className="text-red-500" size={20} />
+                <h2 className="text-xl font-bold text-gray-800">공지사항</h2>
+              </div>
+              <div className="flex flex-col gap-2">
+                {notices.map((post) => (
+                  <PostListItem key={post.id} post={post} />
+                ))}
+              </div>
+            </section>
+          )}
+
+          {/* 최신 포스트 섹션 */}
+          <section>
+            <div className="flex items-center justify-between mb-6">
+              <div className="flex items-center gap-2">
+                <Clock className="text-blue-500" size={20} />
+                <h2 className="text-xl font-bold text-gray-800">최신 포스트</h2>
+              </div>
+              <Link href="/archive" className="text-sm text-gray-400 hover:text-blue-600 flex items-center gap-1 transition-colors">
+                전체보기 <ChevronRight size={14} />
+              </Link>
+            </div>
+            
+            {latestPosts.length > 0 ? (
+              <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
+                {latestPosts.map((post) => (
+                  <div key={post.id} className="h-full">
+                    <PostCard post={post} />
+                  </div>
+                ))}
+              </div>
+            ) : (
+              <div className="text-center py-10 bg-gray-50 rounded-xl text-gray-400">
+                아직 작성된 글이 없습니다.
+              </div>
+            )}
+          </section>
+
+          {/* 인기 포스트 섹션 */}
+          <section>
+            <div className="flex items-center gap-2 mb-6">
+              <Flame className="text-orange-500" size={20} />
+              <h2 className="text-xl font-bold text-gray-800">인기 포스트</h2>
+            </div>
+
+            {popularPosts.length > 0 ? (
+              <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
+                {popularPosts.map((post) => (
+                  <div key={post.id} className="h-full">
+                    <PostCard post={post} />
+                  </div>
+                ))}
+              </div>
+            ) : (
+              <div className="text-center py-10 bg-gray-50 rounded-xl text-gray-400">
+                아직 인기 글이 집계되지 않았습니다.
+              </div>
+            )}
+          </section>
+
+          {/* 하단 아카이브 링크 */}
+          <div className="pt-8 pb-4 text-center">
+            <Link 
+              href="/archive" 
+              className="inline-flex items-center gap-2 px-6 py-3 bg-gray-100 text-gray-600 rounded-full hover:bg-gray-200 transition-colors font-medium text-sm"
+            >
+              모든 글 보러가기 <ChevronRight size={16} />
+            </Link>
+          </div>
+        </div>
       )}
-
-      {/* 🕒 2. 최신 게시글 섹션 (카드 형태) */}
-      <section className="animate-in fade-in slide-in-from-bottom-4 duration-700 delay-100">
-        <div className="flex items-center justify-between mb-6">
-          <div className="flex items-center gap-2">
-            <Clock className="text-blue-500" size={20} />
-            <h2 className="text-xl font-bold text-gray-800">최신 포스트</h2>
-          </div>
-          <Link href="/archive" className="text-sm text-gray-400 hover:text-blue-600 flex items-center gap-1 transition-colors">
-            전체보기 <ChevronRight size={14} />
-          </Link>
-        </div>
-        
-        {latestPosts.length > 0 ? (
-          <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
-             {/* 첫 번째 글은 강조를 위해 크게 보여줄 수도 있지만, 여기선 균일하게 배치 */}
-            {latestPosts.map((post) => (
-              <div key={post.id} className="h-full">
-                <PostCard post={post} />
-              </div>
-            ))}
-          </div>
-        ) : (
-          <div className="text-center py-10 bg-gray-50 rounded-xl text-gray-400">
-            아직 작성된 글이 없습니다.
-          </div>
-        )}
-      </section>
-
-      {/* 🔥 3. 인기 게시글 섹션 (카드 형태) */}
-      <section className="animate-in fade-in slide-in-from-bottom-4 duration-700 delay-200">
-        <div className="flex items-center gap-2 mb-6">
-          <Flame className="text-orange-500" size={20} />
-          <h2 className="text-xl font-bold text-gray-800">인기 포스트</h2>
-        </div>
-
-        {popularPosts.length > 0 ? (
-          <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
-            {popularPosts.map((post) => (
-              <div key={post.id} className="h-full">
-                <PostCard post={post} />
-              </div>
-            ))}
-          </div>
-        ) : (
-          <div className="text-center py-10 bg-gray-50 rounded-xl text-gray-400">
-            아직 인기 글이 집계되지 않았습니다.
-          </div>
-        )}
-      </section>
-
-      {/* 하단 여백 및 아카이브 링크 배너 */}
-      <div className="pt-8 pb-4 text-center">
-        <Link 
-          href="/archive" 
-          className="inline-flex items-center gap-2 px-6 py-3 bg-gray-100 text-gray-600 rounded-full hover:bg-gray-200 transition-colors font-medium text-sm"
-        >
-          모든 글 보러가기 <ChevronRight size={16} />
-        </Link>
-      </div>
-
     </main>
   );
+}
+
+export default function Home() {
+  return (
+    <Suspense fallback={<div className="flex justify-center items-center h-screen"><Loader2 className="animate-spin text-blue-500" size={40} /></div>}>
+      <HomeContent />
+    </Suspense>
+  );
 }
\ No newline at end of file
diff --git a/src/components/layout/Sidebar.tsx b/src/components/layout/Sidebar.tsx
index 62c4f20..7445c44 100644
--- a/src/components/layout/Sidebar.tsx
+++ b/src/components/layout/Sidebar.tsx
@@ -1,8 +1,8 @@
 'use client';
 
-import { useState, useRef, useCallback, useEffect, useMemo } from 'react';
+import { useState, useRef, useCallback, useEffect, useMemo, Suspense } from 'react';
 import Link from 'next/link';
-import { usePathname } from 'next/navigation';
+import { usePathname, useRouter, useSearchParams } from 'next/navigation';
 // 🎨 이미지 최적화를 위해 next/image 사용
 import Image from 'next/image';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
@@ -17,7 +17,8 @@ import {
 import { clsx } from 'clsx';
 import { Profile, ProfileUpdateRequest, Category } from '@/types';
 import { useAuthStore } from '@/store/authStore';
-import toast from 'react-hot-toast'; 
+import toast from 'react-hot-toast';
+import PostSearch from '@/components/post/PostSearch'; // 🆕 검색 컴포넌트 추가
 
 const findCategoryNameById = (categories: Category[], id: number): string | undefined => {
   for (const cat of categories) {
@@ -43,7 +44,6 @@ interface CategoryItemProps {
 function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, onDelete }: CategoryItemProps) {
   const isActive = decodeURIComponent(pathname) === `/category/${category.name}`;
   
-  // 🆕 1. 하위 항목 중에 현재 활성화된 페이지가 있는지 확인 (재귀 체크)
   const hasActiveChild = useMemo(() => {
     const check = (cats: Category[] | undefined): boolean => {
       if (!cats) return false;
@@ -54,10 +54,8 @@ function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, on
     return check(category.children);
   }, [category.children, pathname]);
 
-  // 🆕 2. 펼침 상태 관리 (자신이 활성화됐거나 하위가 활성화됐으면 기본값 true)
   const [isExpanded, setIsExpanded] = useState(isActive || hasActiveChild);
 
-  // 🆕 3. 페이지 이동으로 활성화 상태가 바뀌면 자동으로 펼치기
   useEffect(() => {
     if (isActive || hasActiveChild) {
       setIsExpanded(true);
@@ -157,7 +155,7 @@ function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, on
         {!isEditMode && category.children && category.children.length > 0 && (
           <button
             onClick={(e) => {
-              e.preventDefault(); // Link 이동 막기
+              e.preventDefault(); 
               e.stopPropagation();
               setIsExpanded(!isExpanded);
             }}
@@ -194,11 +192,24 @@ function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, on
   );
 }
 
-export default function Sidebar() {
+function SidebarContent() {
   const [isOpen, setIsOpen] = useState(true);
   const pathname = usePathname();
   const { role, _hasHydrated } = useAuthStore();
   const queryClient = useQueryClient();
+  
+  // 🆕 검색 로직 추가
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  const keyword = searchParams.get('keyword') || '';
+
+  const handleSearch = (newKeyword: string) => {
+    if (newKeyword.trim()) {
+      router.push(`/?keyword=${encodeURIComponent(newKeyword.trim())}`);
+    } else {
+      router.push('/');
+    }
+  };
 
   const [isEditModalOpen, setIsEditModalOpen] = useState(false);
   const [editForm, setEditForm] = useState<ProfileUpdateRequest>({
@@ -396,8 +407,18 @@ export default function Sidebar() {
           
           <div className={clsx('space-y-1 flex-1', !isOpen && 'md:hidden')}>
             
-            {/* 🆕 2. 아카이브 링크 (페이지 이동) - 위로 이동 */}
-            <div className="mb-4 mt-2">
+            {/* 🆕 전체 검색바 (Archives 위) - 수정됨: 그림자 제거 */}
+            <div className="px-1 mb-6 mt-2">
+              <PostSearch 
+                onSearch={handleSearch} 
+                placeholder="검색..." 
+                initialKeyword={keyword}
+                // className="shadow-sm" // 🎨 제거됨: 배경 박스처럼 보이는 문제 해결
+              />
+            </div>
+
+            {/* 2. 아카이브 링크 */}
+            <div className="mb-4">
               <Link 
                 href="/archive"
                 className={clsx(
@@ -412,7 +433,7 @@ export default function Sidebar() {
               </Link>
             </div>
 
-            {/* 구분선 추가 */}
+            {/* 구분선 */}
             <div className="border-t border-gray-100 mb-4" />
 
             {/* 1. 카테고리 섹션 */}
@@ -484,7 +505,6 @@ export default function Sidebar() {
             <form onSubmit={handleSubmit} className="p-6 space-y-4">
               <div className="flex flex-col items-center mb-6">
                 <div className="relative w-24 h-24 mb-3 group cursor-pointer" onClick={() => fileInputRef.current?.click()}>
-                   {/* 🎨 모달 내부 프리뷰 이미지에도 적용 */}
                   <Image src={editForm.imageUrl || defaultProfile.imageUrl!} alt="Preview" fill className="rounded-full object-cover border-2 border-gray-100 group-hover:border-blue-300 transition-colors" unoptimized />
                   <div className="absolute inset-0 bg-black/30 rounded-full flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity z-10"><Camera className="text-white" size={24} /></div>
                 </div>
@@ -507,4 +527,12 @@ export default function Sidebar() {
       )}
     </>
   );
+}
+
+export default function Sidebar() {
+  return (
+    <Suspense fallback={<div className="w-72 h-screen bg-white border-r border-gray-100" />}>
+      <SidebarContent />
+    </Suspense>
+  );
 }
\ No newline at end of file
diff --git a/src/components/post/PostSearch.tsx b/src/components/post/PostSearch.tsx
new file mode 100644
index 0000000..1247269
--- /dev/null
+++ b/src/components/post/PostSearch.tsx
@@ -0,0 +1,69 @@
+'use client';
+
+import { useState, useEffect } from 'react';
+import { Search, X } from 'lucide-react';
+import { clsx } from 'clsx';
+
+interface PostSearchProps {
+  onSearch: (keyword: string) => void;
+  placeholder?: string;
+  className?: string;
+  initialKeyword?: string; // 🆕 URL 동기화를 위한 초기값 prop 추가
+}
+
+export default function PostSearch({ 
+  onSearch, 
+  placeholder = "검색어를 입력하세요...", 
+  className,
+  initialKeyword = '' 
+}: PostSearchProps) {
+  const [keyword, setKeyword] = useState(initialKeyword);
+
+  // 🆕 부모(URL)에서 검색어가 변경되면(예: 메인으로 이동) 입력창도 동기화
+  useEffect(() => {
+    setKeyword(initialKeyword);
+  }, [initialKeyword]);
+
+  const handleSearch = () => {
+    onSearch(keyword);
+  };
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      handleSearch();
+    }
+  };
+
+  const handleClear = () => {
+    setKeyword('');
+    onSearch('');
+  };
+
+  return (
+    <div className={clsx("relative w-full max-w-md", className)}>
+      <div className="relative">
+        <input
+          type="text"
+          value={keyword}
+          onChange={(e) => setKeyword(e.target.value)}
+          onKeyDown={handleKeyDown}
+          placeholder={placeholder}
+          className="w-full pl-10 pr-10 py-2.5 bg-gray-50 border border-gray-200 rounded-full text-sm focus:outline-none focus:ring-2 focus:ring-blue-100 focus:border-blue-500 transition-all placeholder:text-gray-400"
+        />
+        <Search 
+          className="absolute left-3.5 top-1/2 -translate-y-1/2 text-gray-400 cursor-pointer hover:text-blue-500 transition-colors" 
+          size={18} 
+          onClick={handleSearch}
+        />
+        {keyword && (
+          <button
+            onClick={handleClear}
+            className="absolute right-3 top-1/2 -translate-y-1/2 p-1 text-gray-400 hover:text-gray-600 rounded-full hover:bg-gray-200 transition-colors"
+          >
+            <X size={14} />
+          </button>
+        )}
+      </div>
+    </div>
+  );
+}
\ No newline at end of file