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src/app/posts/[slug]/page.tsx

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+// src/app/posts/[slug]/page.tsx
+'use client';
+
+import { useQuery } from '@tanstack/react-query';
+import { getPostBySlug } from '@/api/posts';
+import MarkdownRenderer from '@/components/post/MarkdownRenderer';
+import { format } from 'date-fns';
+import { useParams, useRouter } from 'next/navigation';
+import { ArrowLeft, Calendar, User } from 'lucide-react';
+
+export default function PostDetailPage() {
+  const { slug } = useParams(); // URL에서 slug 가져오기
+  const router = useRouter();
+
+  // 데이터 조회
+  const { data: post, isLoading, isError } = useQuery({
+    queryKey: ['post', slug],
+    queryFn: () => getPostBySlug(slug as string),
+    enabled: !!slug, // slug가 있을 때만 실행
+  });
+
+  if (isLoading) return <div className="text-center py-20 animate-pulse">글을 불러오는 중... ⏳</div>;
+  
+  if (isError || !post) {
+    return (
+      <div className="text-center py-20">
+        <h2 className="text-2xl font-bold mb-4">글을 찾을 수 없습니다. 😭</h2>
+        <button onClick={() => router.back()} className="text-blue-500 hover:underline">
+          뒤로 가기
+        </button>
+      </div>
+    );
+  }
+
+  return (
+    <article className="max-w-3xl mx-auto pb-20">
+      {/* 1. 뒤로가기 버튼 */}
+      <button 
+        onClick={() => router.back()} 
+        className="flex items-center text-gray-500 hover:text-gray-900 mb-8 transition-colors"
+      >
+        <ArrowLeft size={20} className="mr-2" />
+        목록으로
+      </button>
+
+      {/* 2. 헤더 영역 (카테고리, 제목, 날짜) */}
+      <header className="mb-10 text-center">
+        <span className="inline-block bg-blue-100 text-blue-700 text-sm font-semibold px-3 py-1 rounded-full mb-4">
+          {post.categoryName}
+        </span>
+        <h1 className="text-3xl md:text-4xl font-bold text-gray-900 mb-6 leading-tight">
+          {post.title}
+        </h1>
+        
+        <div className="flex items-center justify-center gap-6 text-gray-500 text-sm">
+          <div className="flex items-center gap-2">
+            <User size={16} />
+            <span>Dev Park</span>
+          </div>
+          <div className="flex items-center gap-2">
+            <Calendar size={16} />
+            <time>{format(new Date(post.createdAt), 'yyyy년 MM월 dd일')}</time>
+          </div>
+        </div>
+      </header>
+      
+      {/* 구분선 */}
+      <hr className="border-gray-200 my-10" />
+
+      {/* 3. 본문 영역 (마크다운) */}
+      <div className="bg-white p-6 md:p-10 rounded-2xl shadow-sm border border-gray-100 min-h-[300px]">
+        {/* 본문이 있으면 렌더링, 없으면 안내 문구 */}
+        {post.content ? (
+          <MarkdownRenderer content={post.content} />
+        ) : (
+          <p className="text-gray-400 italic">작성된 본문 내용이 없습니다.</p>
+        )}
+      </div>
+
+      {/* 4. 하단 댓글 영역 (추후 구현 예정 자리) */}
+      <div className="mt-16">
+        <h3 className="text-xl font-bold mb-6">댓글</h3>
+        <div className="bg-gray-50 rounded-xl p-10 text-center text-gray-400">
+          댓글 기능은 곧 추가될 예정입니다! 🚀
+        </div>
+      </div>
+    </article>
+  );
+}