diff --git a/README.md b/README.md
index af8cabe..7df63ed 100644
--- a/README.md
+++ b/README.md
@@ -106,7 +106,7 @@ ai_platform/
 │  ├─ partials/mgmt_perf_dashboard_container.ejs
 │  ├─ ai-prompts.ejs          # 프롬프트 라이브러리 (카드·미리보기·복사)
 │  ├─ ai-cases.ejs            # AI 성공 사례 목록(카드)
-│  ├─ ai-case-detail.ejs       # AI 성공 사례 상세(마크다운)
+│  ├─ ai-case-detail.ejs       # AI 성공 사례 상세(마크다운 또는 PDF·페이지 이미지, 1·2·3단 보기)
 │  ├─ ai-cases-write.ejs      # AI 성공 사례 관리자 등록·편집
 │  ├─ ax-apply.ejs            # AX 과제 신청
 │  ├─ lecture-youtube.ejs     # 유튜브 강의 상세 (iframe 임베드)
diff --git a/public/styles.css b/public/styles.css
index 5b334a9..e208fb1 100644
--- a/public/styles.css
+++ b/public/styles.css
@@ -596,6 +596,14 @@ button {
   gap: 6px;
 }
 
+.ai-case-tools-meta {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 6px;
+  min-width: 0;
+}
+
 .ai-case-tool-sep {
   color: #d1d5db;
   margin: 0 2px;
diff --git a/views/ai-case-detail.ejs b/views/ai-case-detail.ejs
index ccc5557..faa65ae 100644
--- a/views/ai-case-detail.ejs
+++ b/views/ai-case-detail.ejs
@@ -19,20 +19,28 @@
           <a href="/ai-cases" class="back-link">← AI 성공 사례로 돌아가기</a>
           <h1><%= story.title %></h1>
           <p class="description"><%= story.excerpt || (story.department + ' · ' + story.author) %></p>
-          <div class="ppt-tools ai-case-ppt-tools">
-            <span>총 <b><%= slides.length %></b>페이지</span>
-            <span class="ai-case-tool-sep" aria-hidden="true">|</span>
-            <span><%= story.department %> · <%= story.author %><% if (story.publishedAt) { %> · <%= story.publishedAt %><% } %></span>
-            <% if (typeof adminMode !== 'undefined' && adminMode) { %>
-            <span class="ai-case-tool-sep" aria-hidden="true">|</span>
-            <a href="/ai-cases/write?edit=<%= story.slug %>" class="ai-case-inline-link">편집</a>
-            <% } %>
-            <span class="ai-case-tool-sep" aria-hidden="true">|</span>
-            <a href="<%= pdfUrlRaw %>" download class="ai-case-inline-link">다운로드</a>
-            <% if (typeof adminMode !== 'undefined' && adminMode) { %>
-            <span class="ai-case-tool-sep" aria-hidden="true">|</span>
-            <button type="button" class="ai-case-inline-link js-ai-case-delete" data-id="<%= story.id %>" data-title="<%= story.title %>">삭제</button>
-            <% } %>
+          <div class="ppt-tools ai-case-ppt-tools ppt-tools-row">
+            <div class="ai-case-tools-meta">
+              <span>총 <b><%= slides.length %></b>페이지</span>
+              <span class="ai-case-tool-sep" aria-hidden="true">|</span>
+              <span><%= story.department %> · <%= story.author %><% if (story.publishedAt) { %> · <%= story.publishedAt %><% } %></span>
+              <% if (typeof adminMode !== 'undefined' && adminMode) { %>
+              <span class="ai-case-tool-sep" aria-hidden="true">|</span>
+              <a href="/ai-cases/write?edit=<%= story.slug %>" class="ai-case-inline-link">편집</a>
+              <% } %>
+              <span class="ai-case-tool-sep" aria-hidden="true">|</span>
+              <a href="<%= pdfUrlRaw %>" download class="ai-case-inline-link">다운로드</a>
+              <% if (typeof adminMode !== 'undefined' && adminMode) { %>
+              <span class="ai-case-tool-sep" aria-hidden="true">|</span>
+              <button type="button" class="ai-case-inline-link js-ai-case-delete" data-id="<%= story.id %>" data-title="<%= story.title %>">삭제</button>
+              <% } %>
+            </div>
+            <div class="slide-layout-toggle" role="group" aria-label="페이지 한 화면 열 개수">
+              <span class="slide-layout-toggle-label">보기</span>
+              <button type="button" class="slide-layout-btn" data-cols="1" aria-pressed="true">1단</button>
+              <button type="button" class="slide-layout-btn" data-cols="2" aria-pressed="false">2단</button>
+              <button type="button" class="slide-layout-btn" data-cols="3" aria-pressed="false">3단</button>
+            </div>
           </div>
           <% if ((story.tags || []).length) { %>
           <div class="tag-row ai-case-tag-row">
@@ -44,25 +52,17 @@
           <% if (!slideImageUrls || slideImageUrls.length === 0) { %>
           <p class="admin-warn">PDF를 페이지 이미지로 보여 주지 못했습니다. <a href="<%= pdfUrlRaw %>" target="_blank" rel="noopener noreferrer">원본 PDF로 보기</a>. 서버에는 <code>pdftoppm</code>(Poppler)이 필요하고, 저장된 PDF 주소는 브라우저에서 열리는 것과 같이 <code>/public/...</code> 또는 그와 같은 경로의 전체 URL이어야 합니다.</p>
           <% } %>
-          <section class="slide-list">
+          <section class="slide-list slide-list--cols-1" id="slide-list">
             <% slides.forEach((slide, index) => { %>
             <article class="slide-card">
               <header>
                 <h2>페이지 <%= index + 1 %></h2>
-                <% if (slide.title) { %><p><%= slide.title %></p><% } %>
               </header>
               <% if (slideImageUrls[index]) { %>
               <div class="slide-image-wrap">
                 <img src="<%= slideImageUrls[index] %>" alt="페이지 <%= index + 1 %>" class="slide-image" />
               </div>
               <% } %>
-              <% if (slide.lines && slide.lines.length > 0) { %>
-              <ul>
-                <% slide.lines.forEach((line) => { %>
-                <li><%= line %></li>
-                <% }) %>
-              </ul>
-              <% } %>
             </article>
             <% }) %>
           </section>
@@ -101,6 +101,43 @@
         <% } %>
       </div>
     </div>
+    <% if (showPdfViewer) { %>
+    <script>
+      (function () {
+        var KEY = "learningCenterSlideColumns";
+        var list = document.getElementById("slide-list");
+        var buttons = document.querySelectorAll(".slide-layout-btn");
+        if (!list || !buttons.length) return;
+
+        function applyCols(n) {
+          list.classList.remove("slide-list--cols-1", "slide-list--cols-2", "slide-list--cols-3");
+          list.classList.add("slide-list--cols-" + n);
+          buttons.forEach(function (btn) {
+            var on = btn.getAttribute("data-cols") === String(n);
+            btn.setAttribute("aria-pressed", on ? "true" : "false");
+            btn.classList.toggle("is-active", on);
+          });
+          try {
+            localStorage.setItem(KEY, String(n));
+          } catch (e) {}
+        }
+
+        var saved = null;
+        try {
+          saved = localStorage.getItem(KEY);
+        } catch (e) {}
+        var initial = saved === "2" || saved === "3" ? saved : "1";
+        applyCols(initial);
+
+        buttons.forEach(function (btn) {
+          btn.addEventListener("click", function () {
+            var n = btn.getAttribute("data-cols");
+            if (n === "1" || n === "2" || n === "3") applyCols(n);
+          });
+        });
+      })();
+    </script>
+    <% } %>
     <% if (typeof adminMode !== 'undefined' && adminMode) { %>
     <script>
       (function() {