diff --git a/app/api/documents.py b/app/api/documents.py
index d94fcbb..bb1905f 100644
--- a/app/api/documents.py
+++ b/app/api/documents.py
@@ -520,6 +520,63 @@ async def get_document(
     return DocumentResponse.model_validate(doc)
 
 
+# ─── 자료실 인접 자료 (이전/다음) ───
+# 학습 흐름: 한 자료 다 읽으면 같은 챕터의 다음 자료로 자연스럽게 이동.
+# library_path (정확 일치 + 하위 prefix) 안에서 title 오름차순 기준.
+class NeighborItem(BaseModel):
+    id: int
+    title: str | None
+
+
+class LibraryNeighborsResponse(BaseModel):
+    prev: NeighborItem | None
+    next: NeighborItem | None
+    path: str | None  # 같은 path 내에서 계산된 결과
+
+
+@router.get("/{doc_id}/library-neighbors", response_model=LibraryNeighborsResponse)
+async def get_library_neighbors(
+    doc_id: int,
+    user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+):
+    """현재 자료의 같은 library_path 안에서 이전/다음 자료. title_asc 정렬 기준.
+
+    library_path 추출: user_tags 의 첫 번째 `@library/...` 태그.
+    """
+    from core.library import LIBRARY_PREFIX
+
+    doc = await session.get(Document, doc_id)
+    if not doc or doc.deleted_at is not None or doc.category != "library":
+        raise HTTPException(status_code=404, detail="자료실 자료가 아닙니다")
+
+    # 첫 번째 library 태그를 path 로
+    path: str | None = None
+    for t in (doc.user_tags or []):
+        if isinstance(t, str) and t.startswith(LIBRARY_PREFIX):
+            path = t[len(LIBRARY_PREFIX):]
+            break
+    if not path:
+        return LibraryNeighborsResponse(prev=None, next=None, path=None)
+
+    # 같은 path (정확히) 의 자료들 — title 오름차순
+    exact_tag = f"{LIBRARY_PREFIX}{path}"
+    res = await session.execute(
+        select(Document.id, Document.title)
+        .where(
+            Document.deleted_at == None,  # noqa: E711
+            Document.category == "library",
+            Document.user_tags.op("@>")(f'["{exact_tag}"]'),
+        )
+        .order_by(Document.title.asc().nullslast(), Document.id.asc())
+    )
+    rows = list(res)
+    idx = next((i for i, r in enumerate(rows) if r.id == doc_id), -1)
+    prev_n = NeighborItem(id=rows[idx - 1].id, title=rows[idx - 1].title) if idx > 0 else None
+    next_n = NeighborItem(id=rows[idx + 1].id, title=rows[idx + 1].title) if 0 <= idx < len(rows) - 1 else None
+    return LibraryNeighborsResponse(prev=prev_n, next=next_n, path=path)
+
+
 @router.get("/{doc_id}/file")
 async def get_document_file(
     doc_id: int,
diff --git a/frontend/src/routes/documents/[id]/+page.svelte b/frontend/src/routes/documents/[id]/+page.svelte
index 2d47119..bcb8a69 100644
--- a/frontend/src/routes/documents/[id]/+page.svelte
+++ b/frontend/src/routes/documents/[id]/+page.svelte
@@ -9,7 +9,7 @@
   import { addToast } from '$lib/stores/toast';
   import { marked } from 'marked';
   import DOMPurify from 'dompurify';
-  import { ExternalLink, Download, Link2, FileText, PenLine, X } from 'lucide-svelte';
+  import { ExternalLink, Download, Link2, FileText, PenLine, X, ChevronLeft, ChevronRight, Check } from 'lucide-svelte';
   import Button from '$lib/components/ui/Button.svelte';
   import Card from '$lib/components/ui/Card.svelte';
   import EmptyState from '$lib/components/ui/EmptyState.svelte';
@@ -72,6 +72,30 @@
     noteOpen = !noteOpen;
   }
 
+  // 인접 자료 (같은 library_path 내 이전/다음) — 학습 흐름 네비게이션
+  let neighbors = $state({ prev: null, next: null });
+  async function loadNeighbors() {
+    try {
+      neighbors = await api(`/documents/${docId}/library-neighbors`);
+    } catch {
+      neighbors = { prev: null, next: null };
+    }
+  }
+
+  // "1회독 완료 + 다음 자료로" 한 번에
+  async function readAndGoNext() {
+    try {
+      await api(`/documents/${docId}/read`, { method: 'POST' });
+      addToast('success', '1회독 완료');
+    } catch (err) {
+      addToast('error', err?.detail || '회독 기록 실패');
+      return;
+    }
+    if (neighbors.next) {
+      goto(`/documents/${neighbors.next.id}`);
+    }
+  }
+
   onMount(async () => {
     try {
       doc = await api(`/documents/${docId}`);
@@ -89,6 +113,8 @@
     } finally {
       loading = false;
     }
+    // 자료실 자료면 인접 자료 미리 fetch (학습 흐름 네비)
+    if (doc && doc.category === 'library') loadNeighbors();
   });
 
   let viewerType = $derived(
@@ -195,10 +221,10 @@
           {/if}
         </div>
 
-        <!-- 뷰어 -->
+        <!-- 뷰어 — 모바일 가독성: 본문 폰트 키우고 line-height 늘림 -->
         <Card class="min-h-[500px]">
           {#if viewerType === 'markdown' || viewerType === 'hwp-markdown'}
-            <div class="prose prose-invert prose-sm max-w-none markdown-body">
+            <div class="prose prose-invert prose-base lg:prose-sm max-w-none markdown-body leading-relaxed">
               {@html renderMd(doc.extracted_text || rawMarkdown || '*텍스트 추출 대기 중*')}
             </div>
           {:else if viewerType === 'pdf'}
@@ -332,5 +358,42 @@
         </Card>
       </aside>
     </div>
+
+    <!-- 모바일 sticky 하단 바 — 자료실 자료의 학습 흐름 네비게이션 -->
+    {#if doc.category === 'library'}
+      <div class="lg:hidden fixed bottom-0 inset-x-0 z-30 bg-surface border-t border-default px-3 py-2 flex items-center gap-2 shadow-lg">
+        <button
+          type="button"
+          onclick={() => neighbors.prev && goto(`/documents/${neighbors.prev.id}`)}
+          disabled={!neighbors.prev}
+          class="px-2 py-2 rounded text-dim disabled:opacity-30 disabled:cursor-not-allowed"
+          aria-label="이전 자료"
+        ><ChevronLeft size={20} /></button>
+
+        <button
+          type="button"
+          onclick={readAndGoNext}
+          disabled={!neighbors.next}
+          class="flex-1 flex items-center justify-center gap-1.5 px-3 py-2.5 rounded-lg bg-accent text-white text-sm font-medium disabled:opacity-50"
+        >
+          <Check size={16} />
+          {#if neighbors.next}
+            1회독 완료 + 다음
+          {:else}
+            1회독 완료 (마지막 자료)
+          {/if}
+        </button>
+
+        <button
+          type="button"
+          onclick={() => neighbors.next && goto(`/documents/${neighbors.next.id}`)}
+          disabled={!neighbors.next}
+          class="px-2 py-2 rounded text-dim disabled:opacity-30 disabled:cursor-not-allowed"
+          aria-label="다음 자료 (회독 카운트 안 함)"
+        ><ChevronRight size={20} /></button>
+      </div>
+      <!-- 본문이 sticky 바 뒤에 가리지 않도록 패딩 -->
+      <div class="lg:hidden h-20"></div>
+    {/if}
   {/if}
 </div>