feat: 메인화면 UI 수정, 공지 카테고리 설정, 아카이브 기능 추가

src/api/posts.ts

@@ -1,18 +1,20 @@
 import { http } from './http';
 import { ApiResponse, PostListResponse, Post } from '@/types';
 
-// 1. 게시글 목록 조회 (검색, 카테고리, 태그 필터링 지원)
+// 1. 게시글 목록 조회 (검색, 카테고리, 태그, 정렬 필터링 지원)
 export const getPosts = async (params?: { 
   page?: number; 
   size?: number; 
   keyword?: string; 
   category?: string; 
   tag?: string; 
+  sort?: string; // 🆕 정렬 옵션 추가 (예: 'viewCount,desc')
 }) => {
   const response = await http.get<ApiResponse<PostListResponse>>('/api/posts', {
     params: {
       ...params,
-      sort: 'createdAt,desc',
+      // 정렬 값이 없으면 기본값(최신순) 적용
+      sort: params?.sort || 'createdAt,desc',
     }
   });
   return response.data.data;
@@ -33,20 +35,19 @@ export const getPost = async (slug: string) => {
   return response.data.data;
 };
 
-// 4. 게시글 작성 (추가됨)
-// PostSaveRequest 타입에 맞춰 데이터를 보냅니다.
+// 4. 게시글 작성
 export const createPost = async (data: any) => {
   const response = await http.post<ApiResponse<Post>>('/api/admin/posts', data);
   return response.data;
 };
 
-// 5. 게시글 수정 (추가됨)
+// 5. 게시글 수정
 export const updatePost = async (id: number, data: any) => {
   const response = await http.put<ApiResponse<Post>>(`/api/admin/posts/${id}`, data);
   return response.data;
 };
 
-// 6. 게시글 삭제 (추가됨)
+// 6. 게시글 삭제
 export const deletePost = async (id: number) => {
   const response = await http.delete<ApiResponse<null>>(`/api/admin/posts/${id}`);
   return response.data;

src/app/archive/page.tsx

@@ -0,0 +1,150 @@
+'use client';
+
+import { useQuery } from '@tanstack/react-query';
+import { getPosts } from '@/api/posts';
+import { Post } from '@/types';
+import { Loader2, Calendar, Archive, FileText, ChevronRight } from 'lucide-react';
+import { useMemo } from 'react';
+import Link from 'next/link';
+import { format } from 'date-fns';
+import { clsx } from 'clsx';
+
+export default function ArchivePage() {
+  // 1. 전체 게시글 조회 (최대 1000개)
+  const { data, isLoading } = useQuery({
+    queryKey: ['posts', 'all'],
+    queryFn: () => getPosts({ page: 0, size: 1000 }),
+    staleTime: 1000 * 60 * 5, // 5분 캐시
+  });
+
+  // 2. 게시글 그룹화 (연도 -> 월)
+  const archiveGroups = useMemo(() => {
+    if (!data?.content) return {};
+
+    const groups: { [year: string]: { [month: string]: Post[] } } = {};
+
+    data.content.forEach((post) => {
+      const date = new Date(post.createdAt);
+      const year = date.getFullYear().toString();
+      const month = (date.getMonth() + 1).toString().padStart(2, '0'); // '01', '02' 형식
+
+      if (!groups[year]) groups[year] = {};
+      if (!groups[year][month]) groups[year][month] = [];
+
+      groups[year][month].push(post);
+    });
+
+    return groups;
+  }, [data]);
+
+  // 3. 연도 내림차순 정렬
+  const sortedYears = useMemo(() => {
+    return Object.keys(archiveGroups).sort((a, b) => Number(b) - Number(a));
+  }, [archiveGroups]);
+
+  // 총 게시글 수
+  const totalPosts = data?.totalElements || 0;
+
+  if (isLoading) {
+    return (
+      <div className="flex justify-center items-center min-h-[50vh]">
+        <Loader2 className="animate-spin text-blue-500" size={40} />
+      </div>
+    );
+  }
+
+  return (
+    <div className="max-w-4xl mx-auto py-10 px-4">
+      {/* 헤더 섹션 */}
+      <div className="mb-12 text-center md:text-left border-b border-gray-100 pb-8">
+        <h1 className="text-3xl font-bold text-gray-900 flex items-center justify-center md:justify-start gap-3 mb-3">
+          <Archive className="text-blue-600" size={32} />
+          <span>Archives</span>
+        </h1>
+        <p className="text-gray-500">
+          지금까지 작성한 <span className="text-blue-600 font-bold">{totalPosts}</span>개의 글이 기록되어 있습니다.
+        </p>
+      </div>
+
+      {/* 타임라인 컨텐츠 */}
+      {sortedYears.length > 0 ? (
+        <div className="space-y-12 relative">
+          {/* 타임라인 수직선 (좌측 장식) */}
+          <div className="absolute left-4 top-4 bottom-4 w-0.5 bg-gray-100 hidden md:block" />
+
+          {sortedYears.map((year) => {
+            const months = archiveGroups[year];
+            // 월 내림차순 정렬
+            const sortedMonths = Object.keys(months).sort((a, b) => Number(b) - Number(a));
+
+            return (
+              <div key={year} className="relative">
+                {/* 연도 헤더 */}
+                <div className="flex items-center gap-4 mb-6">
+                  <div className="hidden md:flex items-center justify-center w-9 h-9 rounded-full bg-blue-50 border-4 border-white shadow-sm z-10">
+                    <div className="w-2.5 h-2.5 rounded-full bg-blue-500" />
+                  </div>
+                  <h2 className="text-2xl font-bold text-gray-800">{year}</h2>
+                </div>
+
+                {/* 월별 그룹 */}
+                <div className="space-y-8 md:pl-12">
+                  {sortedMonths.map((month) => {
+                    const posts = months[month];
+                    // 게시글 날짜 내림차순 정렬
+                    const sortedPosts = posts.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime());
+
+                    return (
+                      <div key={month} className="group">
+                        <h3 className="text-lg font-bold text-gray-600 mb-4 flex items-center gap-2">
+                          <Calendar size={18} className="text-gray-400" />
+                          {month}월
+                          <span className="text-xs font-normal bg-gray-100 text-gray-500 px-2 py-0.5 rounded-full">
+                            {posts.length}
+                          </span>
+                        </h3>
+
+                        <div className="grid gap-3">
+                          {sortedPosts.map((post) => (
+                            <Link 
+                              key={post.id} 
+                              href={`/posts/${post.slug}`}
+                              className="block bg-white border border-gray-100 rounded-lg p-4 hover:border-blue-200 hover:shadow-md transition-all duration-200 group/item"
+                            >
+                              <div className="flex items-center justify-between gap-4">
+                                <div className="flex-1 min-w-0">
+                                  <h4 className="text-base font-medium text-gray-800 truncate group-hover/item:text-blue-600 transition-colors">
+                                    {post.title}
+                                  </h4>
+                                  <div className="flex items-center gap-2 mt-1.5 text-xs text-gray-400">
+                                    <span className="bg-gray-50 px-1.5 py-0.5 rounded text-gray-500">
+                                      {post.categoryName}
+                                    </span>
+                                    <span>•</span>
+                                    <span className="tabular-nums">
+                                      {format(new Date(post.createdAt), 'yyyy.MM.dd')}
+                                    </span>
+                                  </div>
+                                </div>
+                                <ChevronRight className="text-gray-300 group-hover/item:text-blue-400 transition-colors" size={20} />
+                              </div>
+                            </Link>
+                          ))}
+                        </div>
+                      </div>
+                    );
+                  })}
+                </div>
+              </div>
+            );
+          })}
+        </div>
+      ) : (
+        <div className="text-center py-20 bg-gray-50 rounded-xl border border-dashed border-gray-200">
+          <FileText className="mx-auto text-gray-300 mb-3" size={48} />
+          <p className="text-gray-500">아직 작성된 기록이 없습니다.</p>
+        </div>
+      )}
+    </div>
+  );
+}

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

@@ -4,7 +4,7 @@ import { use, useState, useEffect } from 'react';
 import { useQuery } from '@tanstack/react-query';
 import { getPostsByCategory } from '@/api/posts';
 import PostCard from '@/components/post/PostCard';
-import PostListItem from '@/components/post/PostListItem'; // 추가
+import PostListItem from '@/components/post/PostListItem'; 
 import { Loader2, ChevronLeft, ChevronRight, LayoutGrid, List } from 'lucide-react';
 import { notFound } from 'next/navigation';
 import { clsx } from 'clsx';
@@ -13,20 +13,34 @@ export default function CategoryPage({ params }: { params: Promise<{ id: string
   const { id } = use(params);
   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 [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');
   const PAGE_SIZE = 10;
 
-  // 💡 로컬 스토리지에서 뷰 모드 불러오기
   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);
-    localStorage.setItem('postViewMode', mode);
+    // 공지 카테고리가 아닐 때만 사용자 설정을 저장 (공지는 뷰 강제이므로 저장 안 함)
+    if (!isNoticeCategory) {
+      localStorage.setItem('postViewMode', mode);
+    }
   };
 
   const { data: postsData, isLoading, error, isPlaceholderData } = useQuery({

src/app/login/page.tsx

@@ -39,8 +39,9 @@ export default function LoginPage() {
   };
 
   return (
-    <div className="flex flex-col items-center justify-center min-h-screen p-4 bg-gray-50">
-      <div className="w-full max-w-md bg-white rounded-2xl shadow-xl overflow-hidden p-8">
+    // 🎨 배경색 수정: bg-gray-50 -> bg-white
+    <div className="flex flex-col items-center justify-center min-h-screen p-4 bg-white">
+      <div className="w-full max-w-md bg-white rounded-2xl shadow-xl overflow-hidden p-8 border border-gray-100">
         <div className="text-center mb-8">
           <h1 className="text-3xl font-bold text-gray-900">로그인</h1>
           <p className="text-gray-500 mt-2">블로그에 오신 것을 환영합니다.</p>

src/app/page.tsx

@@ -1,39 +1,34 @@
 'use client';
 
-import { useState, useEffect } from 'react';
 import { useQuery } from '@tanstack/react-query';
 import { getPosts } from '@/api/posts';
 import PostCard from '@/components/post/PostCard';
-import PostListItem from '@/components/post/PostListItem'; // 새로 만든 컴포넌트 import
+import PostListItem from '@/components/post/PostListItem';
 import { Post } from '@/types';
-import { ChevronLeft, ChevronRight, Loader2, LayoutGrid, List } from 'lucide-react';
-import { clsx } from 'clsx';
+import { Loader2, Megaphone, Flame, Clock, ChevronRight } from 'lucide-react';
+import Link from 'next/link';
 
 export default function Home() {
-  const [page, setPage] = useState(0);
-  // 뷰 모드 상태: 'grid' 또는 'list'
-  const [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');
-  const PAGE_SIZE = 10;
-
-  // 💡 사용자 선호 모드를 로컬 스토리지에서 불러오기 (UX 향상)
-  useEffect(() => {
-    const savedMode = localStorage.getItem('postViewMode') as 'grid' | 'list';
-    if (savedMode) setViewMode(savedMode);
-  }, []);
-
-  // 모드 변경 시 로컬 스토리지에 저장
-  const handleViewModeChange = (mode: 'grid' | 'list') => {
-    setViewMode(mode);
-    localStorage.setItem('postViewMode', mode);
-  };
-
-  const { data, isLoading, isError, isPlaceholderData } = useQuery({
-    queryKey: ['posts', page],
-    queryFn: () => getPosts({ page, size: PAGE_SIZE }), 
-    placeholderData: (previousData) => previousData,
+  // 1. 공지사항 조회 (최대 3개, 최신순)
+  const { data: noticesData, isLoading: isNoticesLoading } = useQuery({
+    queryKey: ['posts', 'notices'],
+    queryFn: () => getPosts({ category: '공지', size: 3, sort: 'createdAt,desc' }),
   });
 
-  if (isLoading) {
+  // 2. 최신 게시글 조회 (넉넉히 10개 가져와서 공지 제외하고 3개만 사용)
+  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)
+  const { data: popularData, isLoading: isPopularLoading } = useQuery({
+    queryKey: ['posts', 'popular'],
+    queryFn: () => getPosts({ size: 10, sort: 'viewCount,desc' }),
+  });
+
+  // 로딩 상태 처리
+  if (isNoticesLoading || isLatestLoading || isPopularLoading) {
     return (
       <div className="flex justify-center items-center h-screen">
         <Loader2 className="animate-spin text-blue-500" size={40} />
@@ -41,103 +36,97 @@ export default function Home() {
     );
   }
 
-  if (isError) {
-    return (
-      <div className="max-w-4xl mx-auto p-6 text-center pt-20 text-red-500">
-        게시글을 불러오지 못했습니다. 서버가 켜져 있는지 확인해주세요.
-      </div>
-    );
-  }
-
-  const handlePrevPage = () => {
-    setPage((old) => Math.max(old - 1, 0));
+  // 데이터 필터링 헬퍼 함수
+  const filterPosts = (posts: Post[] | undefined, limit: number) => {
+    if (!posts) return [];
+    return posts
+      .filter((post) => post.categoryName !== '공지' && post.categoryName.toLowerCase() !== 'notice')
+      .slice(0, limit);
   };
 
-  const handleNextPage = () => {
-    if (!data?.last) {
-      setPage((old) => old + 1);
-    }
-  };
+  const notices = noticesData?.content || [];
+  // 5개 -> 3개로 수정
+  const latestPosts = filterPosts(latestData?.content, 3);
+  const popularPosts = filterPosts(popularData?.content, 3);
 
   return (
-    <main className="max-w-4xl mx-auto p-6 min-h-screen">
-      {/* 헤더 영역 (제목 + 뷰 모드 버튼) */}
-      <header className="mb-8 mt-10 flex items-center justify-between">
-        <h1 className="text-3xl font-bold text-gray-900">전체 게시글</h1>
+    <main className="max-w-4xl mx-auto px-4 py-8 space-y-16">
+      
+      {/* 📢 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} />
+            ))}
+          </div>
+        </section>
+      )}
+
+      {/* 🕒 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>
         
-        {/* 뷰 모드 토글 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>
+        {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>
-      </header>
 
-      {/* 게시글 목록 (조건부 렌더링) */}
-      {viewMode === 'grid' ? (
-        // 그리드 뷰
-        <section className="grid gap-6 md:grid-cols-2">
-          {data?.content.map((post: Post) => (
-            <PostCard key={post.id} post={post} />
-          ))}
-        </section>
-      ) : (
-        // 리스트 뷰
-        <section className="flex flex-col border-t border-gray-100">
-          {data?.content.map((post: Post) => (
-            <PostListItem key={post.id} post={post} />
-          ))}
-        </section>
-      )}
+        {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>
 
-      {data?.content.length === 0 && (
-        <div className="text-center py-20 text-gray-500 bg-gray-50 rounded-lg">
-          작성된 게시글이 없습니다.
-        </div>
-      )}
+      {/* 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>
 
-      {data && data.content.length > 0 && (
-        <div className="flex justify-center items-center gap-6 mt-12 mb-8">
-          <button
-            onClick={handlePrevPage}
-            disabled={page === 0}
-            className="p-2 rounded-full hover:bg-gray-100 disabled:opacity-30 disabled:hover:bg-transparent transition-colors disabled:cursor-not-allowed"
-            aria-label="이전 페이지"
-          >
-            <ChevronLeft size={24} />
-          </button>
-          
-          <span className="text-sm font-medium text-gray-600">
-             Page <span className="text-gray-900 font-bold">{page + 1}</span> {data.totalPages > 0 && `/ ${data.totalPages}`}
-          </span>
-
-          <button
-            onClick={handleNextPage}
-            disabled={data.last || 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"
-          >
-            <ChevronRight size={24} />
-          </button>
-        </div>
-      )}
     </main>
   );
 }

src/app/signup/page.tsx

@@ -1,4 +1,3 @@
-// src/app/signup/page.tsx
 'use client';
 
 import { useState } from 'react';
@@ -59,7 +58,8 @@ export default function SignupPage() {
   };
 
   return (
-    <div className="min-h-screen flex items-center justify-center bg-gray-50 px-4 py-12">
+    // 🎨 배경색 수정: bg-gray-50 -> bg-white
+    <div className="min-h-screen flex items-center justify-center bg-white px-4 py-12">
       <div className="max-w-md w-full bg-white rounded-2xl shadow-xl p-8 border border-gray-100">
         
         {/* 헤더 */}
@@ -137,7 +137,7 @@ export default function SignupPage() {
               disabled={loading}
               className="w-full bg-green-600 hover:bg-green-700 text-white font-bold py-3 rounded-lg transition-colors disabled:bg-gray-400"
             >
-              {loading ? '확인 중...' : '인증 완료'}
+              {loading ? '처리 중...' : '인증 완료'}
             </button>
             
             <button

src/components/layout/Sidebar.tsx

@@ -11,12 +11,13 @@ import { getProfile, updateProfile } from '@/api/profile';
 import { uploadImage } from '@/api/image';
 import { 
   Github, Mail, Menu, X, ChevronRight, Folder, FolderOpen, 
-  Edit3, Camera, Save, XCircle, Plus, Trash2, Move, Settings, FileQuestion 
+  Edit3, Camera, Save, XCircle, Plus, Trash2, Move, Settings, FileQuestion,
+  Archive
 } from 'lucide-react';
 import { clsx } from 'clsx';
 import { Profile, ProfileUpdateRequest, Category } from '@/types';
 import { useAuthStore } from '@/store/authStore';
-import toast from 'react-hot-toast'; // 🎨 Toast 추가
+import toast from 'react-hot-toast'; 
 
 const findCategoryNameById = (categories: Category[], id: number): string | undefined => {
   for (const cat of categories) {
@@ -41,6 +42,28 @@ interface CategoryItemProps {
 
 function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, onDelete }: CategoryItemProps) {
   const isActive = decodeURIComponent(pathname) === `/category/${category.name}`;
+  
+  // 🆕 1. 하위 항목 중에 현재 활성화된 페이지가 있는지 확인 (재귀 체크)
+  const hasActiveChild = useMemo(() => {
+    const check = (cats: Category[] | undefined): boolean => {
+      if (!cats) return false;
+      return cats.some(c => 
+        decodeURIComponent(pathname) === `/category/${c.name}` || check(c.children)
+      );
+    };
+    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);
+    }
+  }, [isActive, hasActiveChild]);
+
   const [isDragOver, setIsDragOver] = useState(false);
   
   const handleDragStart = (e: React.DragEvent) => {
@@ -79,7 +102,6 @@ function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, on
     }
   };
 
-  // 🆕 하위 카테고리도 ID 순으로 정렬
   const sortedChildren = useMemo(() => {
     if (!category.children) return [];
     return [...category.children].sort((a, b) => a.id - b.id);
@@ -133,12 +155,27 @@ function CategoryItem({ category, depth, pathname, isEditMode, onDrop, onAdd, on
         )}
 
         {!isEditMode && category.children && category.children.length > 0 && (
-          <ChevronRight size={14} className={clsx("text-gray-300 transition-transform", isActive && "rotate-90")} />
+          <button
+            onClick={(e) => {
+              e.preventDefault(); // Link 이동 막기
+              e.stopPropagation();
+              setIsExpanded(!isExpanded);
+            }}
+            className="p-1 hover:bg-gray-200/50 rounded-full transition-colors ml-1"
+          >
+            <ChevronRight 
+              size={14} 
+              className={clsx(
+                "text-gray-400 transition-transform duration-200", 
+                isExpanded && "rotate-90"
+              )} 
+            />
+          </button>
         )}
       </div>
 
-      {sortedChildren.length > 0 && (
-        <div className="border-l-2 border-gray-100 ml-4">
+      {isExpanded && sortedChildren.length > 0 && (
+        <div className="border-l-2 border-gray-100 ml-4 animate-in slide-in-from-top-1 duration-200 fade-in">
           {sortedChildren.map((child) => (
             <CategoryItem 
               key={child.id} 
@@ -172,7 +209,7 @@ export default function Sidebar() {
 
   const [isCategoryEditMode, setIsCategoryEditMode] = useState(false);
   const [isRootDragOver, setIsRootDragOver] = useState(false);
-
+  
   const isAdmin = _hasHydrated && role?.includes('ADMIN');
 
   useEffect(() => {
@@ -187,7 +224,6 @@ export default function Sidebar() {
     queryFn: getCategories,
   });
 
-  // 🆕 최상위 카테고리 ID 순 정렬
   const sortedCategories = useMemo(() => {
     if (!categories) return undefined;
     return [...categories].sort((a, b) => a.id - b.id);
@@ -234,8 +270,6 @@ export default function Sidebar() {
   });
 
   const handleAddCategory = (parentId: number | null) => {
-    // 🎨 Prompt 대신 간단한 로직 유지 (복잡도 증가 방지) 
-    // 실제로는 모달로 바꾸는게 좋지만, 여기선 일단 Toast만 적용
     const name = prompt('새 카테고리 이름을 입력하세요:'); 
     if (!name || !name.trim()) return;
     createCategoryMutation.mutate({ name, parentId });
@@ -332,7 +366,6 @@ export default function Sidebar() {
           )}
           <Link href="/" className="block hover:opacity-80 transition-opacity">
             <div className="w-24 h-24 mx-auto bg-gray-200 rounded-full mb-4 overflow-hidden shadow-inner ring-4 ring-gray-50 relative">
-              {/* 🛠️ 수정됨: 로딩 중일 때는 이미지 대신 스켈레톤 표시 */}
               {isProfileLoading ? (
                 <div className="w-full h-full bg-gray-200 animate-pulse" />
               ) : (
@@ -360,8 +393,30 @@ export default function Sidebar() {
 
         <nav className="flex-1 px-4 py-2 flex flex-col">
           <div className={clsx('flex flex-col items-center gap-4 mt-4', isOpen && 'hidden')}><Folder size={24} className="text-gray-400" /></div>
+          
           <div className={clsx('space-y-1 flex-1', !isOpen && 'md:hidden')}>
-            <div className="flex items-center justify-between px-4 mb-3 mt-4 h-8">
+            
+            {/* 🆕 2. 아카이브 링크 (페이지 이동) - 위로 이동 */}
+            <div className="mb-4 mt-2">
+              <Link 
+                href="/archive"
+                className={clsx(
+                  'flex items-center gap-2.5 px-4 py-2 text-sm rounded-lg transition-all group',
+                  pathname === '/archive'
+                    ? 'bg-blue-50 text-blue-600 font-medium'
+                    : 'text-gray-600 hover:bg-gray-50'
+                )}
+              >
+                <Archive size={16} />
+                <span>Archives</span>
+              </Link>
+            </div>
+
+            {/* 구분선 추가 */}
+            <div className="border-t border-gray-100 mb-4" />
+
+            {/* 1. 카테고리 섹션 */}
+            <div className="flex items-center justify-between px-4 mb-3 h-8">
               <p className="text-xs font-bold text-gray-400 uppercase tracking-wider">Categories</p>
               {isAdmin && (
                 <div className="flex items-center gap-1">
@@ -380,7 +435,7 @@ export default function Sidebar() {
             {!categories && <div className="space-y-2 px-4">{[1, 2, 3].map((i) => <div key={i} className="h-8 bg-gray-100 rounded animate-pulse" />)}</div>}
 
             <div 
-              className={clsx("min-h-[100px] pb-10 transition-colors rounded-lg", isCategoryEditMode && "border-2 border-dashed", isRootDragOver ? "border-blue-500 bg-blue-50" : "border-transparent")}
+              className={clsx("min-h-[50px] transition-colors rounded-lg mb-6", isCategoryEditMode && "border-2 border-dashed", isRootDragOver ? "border-blue-500 bg-blue-50" : "border-transparent")}
               onDragOver={isCategoryEditMode ? (e) => { e.preventDefault(); setIsRootDragOver(true); e.dataTransfer.dropEffect = 'move'; } : undefined}
               onDragLeave={isCategoryEditMode ? (e) => { e.preventDefault(); setIsRootDragOver(false); } : undefined}
               onDrop={isCategoryEditMode ? handleRootDrop : undefined}
@@ -405,7 +460,6 @@ export default function Sidebar() {
                   </Link>
                 </div>
               )}
-
               {isCategoryEditMode && categories?.length === 0 && <div className="text-center text-xs text-gray-400 py-4">+ 버튼을 눌러 카테고리를 추가하세요.</div>}
             </div>
           </div>

src/components/post/PostCard.tsx

@@ -1,6 +1,7 @@
 import { Post } from '@/types';
 import Link from 'next/link';
 import { format } from 'date-fns';
+import { clsx } from 'clsx'; // 🎨 스타일 조건부 적용을 위해 clsx 사용
 
 // 🛠️ 헬퍼 함수: 마크다운 문법 제거하고 순수 텍스트만 추출
 function getSummary(content?: string) {
@@ -16,15 +17,30 @@ function getSummary(content?: string) {
 export default function PostCard({ post }: { post: Post }) {
   // 요약문 생성
   const summary = getSummary(post.content);
+  
+  // 📢 공지 카테고리 여부 확인 (한글 '공지' 또는 영문 'Notice' 대소문자 무관)
+  const isNotice = post.categoryName === '공지' || post.categoryName.toLowerCase() === 'notice';
 
   return (
     <Link href={`/posts/${post.slug}`} className="block group h-full">
-      <article className="flex flex-col h-full bg-white rounded-2xl p-6 shadow-[0_2px_8px_rgba(0,0,0,0.04)] hover:shadow-[0_8px_24px_rgba(0,0,0,0.08)] hover:-translate-y-1 transition-all duration-300 border border-gray-100">
+      <article className={clsx(
+        "flex flex-col h-full bg-white rounded-2xl p-6 transition-all duration-300 border",
+        // 공지글이면 테두리에 살짝 붉은 기운을 줌
+        isNotice 
+          ? "border-red-100 shadow-[0_2px_8px_rgba(239,68,68,0.08)] hover:shadow-[0_8px_24px_rgba(239,68,68,0.12)]" 
+          : "border-gray-100 shadow-[0_2px_8px_rgba(0,0,0,0.04)] hover:shadow-[0_8px_24px_rgba(0,0,0,0.08)]",
+        "hover:-translate-y-1"
+      )}>
         
         {/* 상단 카테고리 & 날짜 */}
         <div className="flex items-center justify-between text-xs mb-4">
-          <span className="px-2.5 py-1 rounded-md bg-slate-100 text-slate-600 font-medium">
-            {post.categoryName}
+          <span className={clsx(
+            "px-2.5 py-1 rounded-md font-medium transition-colors",
+            isNotice 
+              ? "bg-red-50 text-red-600 font-bold border border-red-100" // 🔴 공지 스타일
+              : "bg-slate-100 text-slate-600" // 기본 스타일
+          )}>
+            {isNotice && '📢 '}{post.categoryName}
           </span>
           <time className="text-gray-400 font-light">
             {format(new Date(post.createdAt), 'MMM dd, yyyy')}
@@ -32,18 +48,24 @@ export default function PostCard({ post }: { post: Post }) {
         </div>
         
         {/* 제목 */}
-        <h2 className="text-xl font-bold text-gray-800 mb-3 group-hover:text-blue-600 transition-colors line-clamp-2">
+        <h2 className={clsx(
+          "text-xl font-bold mb-3 transition-colors line-clamp-2",
+          isNotice ? "text-gray-900 group-hover:text-red-600" : "text-gray-800 group-hover:text-blue-600"
+        )}>
           {post.title}
         </h2>
         
-        {/* 요약글 (이제 실제 데이터가 나옵니다) */}
+        {/* 요약글 */}
         <p className="text-gray-500 text-sm line-clamp-3 mb-6 flex-1 leading-relaxed break-words min-h-[3rem]">
           {summary}
         </p>
 
         {/* 하단 정보 */}
         <div className="flex items-center justify-between pt-4 border-t border-gray-50">
-          <span className="text-xs font-medium text-blue-500 flex items-center gap-1">
+          <span className={clsx(
+            "text-xs font-medium flex items-center gap-1",
+            isNotice ? "text-red-500" : "text-blue-500"
+          )}>
             Read more <span className="group-hover:translate-x-1 transition-transform">→</span>
           </span>
         </div>

src/components/post/PostListItem.tsx

@@ -2,23 +2,42 @@ import Link from 'next/link';
 import { Post } from '@/types';
 import { format } from 'date-fns';
 import { Eye } from 'lucide-react';
+import { clsx } from 'clsx';
 
 interface PostListItemProps {
   post: Post;
 }
 
 export default function PostListItem({ post }: PostListItemProps) {
+  // 📢 공지 카테고리 여부 확인
+  const isNotice = post.categoryName === '공지' || post.categoryName.toLowerCase() === 'notice';
+
   return (
     <Link href={`/posts/${post.slug}`} className="block group">
-      <div className="flex items-center justify-between py-4 border-b border-gray-100 hover:bg-gray-50 px-4 -mx-4 rounded-lg transition-colors">
+      <div className={clsx(
+        "flex items-center justify-between py-4 border-b px-4 -mx-4 rounded-lg transition-colors",
+        isNotice 
+          ? "border-red-50 hover:bg-red-50/30" // 공지일 때 배경색 살짝 붉게
+          : "border-gray-100 hover:bg-gray-50"
+      )}>
         <div className="flex items-center gap-4 flex-1 min-w-0">
-            {/* 카테고리 라벨 (작은 화면에선 숨김 처리 가능) */}
-            <span className="hidden sm:inline-block px-2.5 py-1 rounded-md bg-slate-100 text-slate-600 text-xs font-medium whitespace-nowrap">
-              {post.categoryName}
+            {/* 카테고리 라벨 */}
+            <span className={clsx(
+              "hidden sm:inline-block px-2.5 py-1 rounded-md text-xs font-medium whitespace-nowrap",
+              isNotice 
+                ? "bg-red-100 text-red-600 font-bold" // 🔴 공지 스타일 강조
+                : "bg-slate-100 text-slate-600"
+            )}>
+              {isNotice && '📢 '}{post.categoryName}
             </span>
 
             {/* 제목 */}
-            <h3 className="text-base font-medium text-gray-800 truncate group-hover:text-blue-600 transition-colors">
+            <h3 className={clsx(
+              "text-base font-medium truncate transition-colors",
+              isNotice 
+                ? "text-gray-900 group-hover:text-red-600 font-semibold" 
+                : "text-gray-800 group-hover:text-blue-600"
+            )}>
               {post.title}
             </h3>
         </div>