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src/components/post/PostDetailClient.tsx

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+'use client';
+
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { getPost, deletePost, getPostsByCategory } from '@/api/posts';
+import { getProfile } from '@/api/profile';
+import MarkdownRenderer from '@/components/post/MarkdownRenderer';
+import CommentList from '@/components/comment/CommentList';
+import { Loader2, Calendar, Eye, Folder, User, Edit2, Trash2, ArrowLeft, AlertCircle, ChevronLeft, ChevronRight } from 'lucide-react';
+import { useRouter } from 'next/navigation';
+import { useAuthStore } from '@/store/authStore';
+import Link from 'next/link';
+
+interface PostDetailClientProps {
+  slug: string;
+}
+
+export default function PostDetailClient({ slug }: PostDetailClientProps) {
+  const router = useRouter();
+  const queryClient = useQueryClient();
+  const { role, _hasHydrated } = useAuthStore();
+  const isAdmin = _hasHydrated && role?.includes('ADMIN');
+
+  // 1. 게시글 상세 조회
+  const { data: post, isLoading: isPostLoading, error } = useQuery({
+    queryKey: ['post', slug],
+    queryFn: () => getPost(slug),
+    enabled: !!slug,
+    retry: 1,
+  });
+
+  // 2. 같은 카테고리 글 조회 (이전/다음 글)
+  const { data: neighborPosts } = useQuery({
+    queryKey: ['posts', 'category', post?.categoryName],
+    queryFn: () => getPostsByCategory(post!.categoryName, 0, 100),
+    enabled: !!post?.categoryName,
+    staleTime: 1000 * 60 * 5,
+  });
+
+  const { data: profile } = useQuery({
+    queryKey: ['profile'],
+    queryFn: getProfile,
+  });
+
+  const deleteMutation = useMutation({
+    mutationFn: deletePost,
+    onSuccess: () => {
+      alert('게시글이 삭제되었습니다.');
+      queryClient.invalidateQueries({ queryKey: ['posts'] });
+      router.push('/');
+    },
+    onError: (err: any) => {
+      alert('삭제 실패: ' + (err.response?.data?.message || err.message));
+    },
+  });
+
+  if (isPostLoading) {
+    return (
+      <div className="flex justify-center items-center h-screen">
+        <Loader2 className="animate-spin text-blue-500" size={40} />
+      </div>
+    );
+  }
+
+  if (error || !post) {
+    const errorStatus = (error as any)?.response?.status;
+    const errorMessage = (error as any)?.response?.data?.message || error?.message || '게시글을 찾을 수 없습니다.';
+    const isAuthError = errorStatus === 401 || errorStatus === 403;
+
+    return (
+      <div className="max-w-4xl mx-auto px-4 py-20 text-center">
+        <div className="flex justify-center mb-4">
+          <AlertCircle className="text-gray-300" size={64} />
+        </div>
+        <h2 className="text-2xl font-bold text-gray-800 mb-2">
+          {isAuthError ? '접근 권한이 없습니다.' : '게시글을 불러올 수 없습니다.'}
+        </h2>
+        <p className="text-gray-500 mb-6">
+          {isAuthError ? '로그인이 필요하거나 비공개 게시글일 수 있습니다.' : errorMessage}
+        </p>
+        <div className="flex justify-center gap-3">
+          <button onClick={() => router.push('/')} className="px-5 py-2.5 bg-gray-100 text-gray-700 font-medium rounded-lg hover:bg-gray-200 transition-colors">메인으로</button>
+        </div>
+      </div>
+    );
+  }
+
+  const currentIndex = neighborPosts?.content.findIndex((p) => p.id === post.id) ?? -1;
+  const newerPost = (currentIndex > 0 && neighborPosts) ? neighborPosts.content[currentIndex - 1] : null;
+  const olderPost = (currentIndex !== -1 && neighborPosts && currentIndex < neighborPosts.content.length - 1) ? neighborPosts.content[currentIndex + 1] : null;
+
+  const handleDelete = () => {
+    if (confirm('정말로 이 게시글을 삭제하시겠습니까? 복구할 수 없습니다.')) {
+      deleteMutation.mutate(post.id);
+    }
+  };
+
+  const handleEdit = () => {
+    router.push(`/write?slug=${post.slug}`);
+  };
+
+  return (
+    <div className="max-w-4xl mx-auto px-4 py-12">
+      <Link href="/" className="inline-flex items-center gap-1 text-gray-500 hover:text-blue-600 mb-8 transition-colors">
+        <ArrowLeft size={18} />
+        <span className="text-sm font-medium">목록으로</span>
+      </Link>
+
+      <article>
+        <header className="mb-10 border-b border-gray-100 pb-8">
+          <div className="flex justify-between items-start mb-4">
+            <div className="flex items-center gap-2 text-sm text-blue-600 font-medium bg-blue-50 px-3 py-1 rounded-full">
+              <Folder size={14} />
+              <span>{post.categoryName || 'Uncategorized'}</span>
+            </div>
+            {isAdmin && (
+              <div className="flex gap-2">
+                <button onClick={handleEdit} className="p-2 text-gray-400 hover:text-blue-600 hover:bg-blue-50 rounded-full transition-colors"><Edit2 size={18} /></button>
+                <button onClick={handleDelete} className="p-2 text-gray-400 hover:text-red-600 hover:bg-red-50 rounded-full transition-colors"><Trash2 size={18} /></button>
+              </div>
+            )}
+          </div>
+          <h1 className="text-4xl md:text-5xl font-bold text-gray-900 mb-6 leading-tight break-keep">{post.title}</h1>
+          <div className="flex flex-wrap items-center gap-6 text-sm text-gray-500">
+            <div className="flex items-center gap-2">
+              {profile?.imageUrl ? <img src={profile.imageUrl} alt="Author" className="w-8 h-8 rounded-full object-cover border border-gray-100 shadow-sm" /> : <div className="w-8 h-8 bg-gray-100 rounded-full flex items-center justify-center"><User size={16} /></div>}
+              <span className="font-bold text-gray-800">{profile?.name || 'Dev Park'}</span>
+            </div>
+            <div className="flex items-center gap-1.5"><Calendar size={16} />{new Date(post.createdAt).toLocaleDateString()}</div>
+            <div className="flex items-center gap-1.5"><Eye size={16} />{post.viewCount} views</div>
+          </div>
+        </header>
+
+        <div className="prose prose-lg max-w-none prose-headings:font-bold prose-a:text-blue-600 prose-img:rounded-2xl prose-pre:bg-[#1e1e1e] prose-pre:text-gray-100 mb-20">
+          <MarkdownRenderer content={post.content || ''} />
+        </div>
+      </article>
+
+      <nav className="grid grid-cols-1 md:grid-cols-2 gap-4 border-t border-b border-gray-100 py-8 mb-16">
+        {olderPost ? (
+          <Link href={`/posts/${olderPost.slug}`} className="group flex flex-col items-start gap-1 p-5 rounded-2xl bg-gray-50 hover:bg-blue-50 transition-colors w-full border border-transparent hover:border-blue-100">
+            <span className="text-xs font-bold text-gray-400 uppercase flex items-center gap-1 group-hover:text-blue-600 transition-colors"><ChevronLeft size={16} /> 이전 글</span>
+            <span className="font-bold text-gray-700 group-hover:text-blue-700 transition-colors line-clamp-1 w-full text-left">{olderPost.title}</span>
+          </Link>
+        ) : <div className="hidden md:block p-5 rounded-2xl bg-gray-50/50 w-full opacity-50 cursor-not-allowed"><span className="text-xs font-bold text-gray-300 uppercase flex items-center gap-1"><ChevronLeft size={16} /> 이전 글 없음</span></div>}
+
+        {newerPost ? (
+          <Link href={`/posts/${newerPost.slug}`} className="group flex flex-col items-end gap-1 p-5 rounded-2xl bg-gray-50 hover:bg-blue-50 transition-colors w-full border border-transparent hover:border-blue-100">
+            <span className="text-xs font-bold text-gray-400 uppercase flex items-center gap-1 group-hover:text-blue-600 transition-colors">다음 글 <ChevronRight size={16} /></span>
+            <span className="font-bold text-gray-700 group-hover:text-blue-700 transition-colors line-clamp-1 w-full text-right">{newerPost.title}</span>
+          </Link>
+        ) : <div className="hidden md:flex flex-col items-end gap-1 p-5 rounded-2xl bg-gray-50/50 w-full opacity-50 cursor-not-allowed"><span className="text-xs font-bold text-gray-300 uppercase flex items-center gap-1">다음 글 없음 <ChevronRight size={16} /></span></div>}
+      </nav>
+
+      <CommentList postSlug={post.slug} />
+    </div>
+  );
+}