diff --git a/app/workers/classify_worker.py b/app/workers/classify_worker.py
index ae16441..cd2aeb4 100644
--- a/app/workers/classify_worker.py
+++ b/app/workers/classify_worker.py
@@ -1,6 +1,5 @@
 """AI 분류 워커 — Qwen3.5로 도메인/태그/요약 생성 + Inbox→Knowledge 이동"""
 
-import shutil
 from datetime import datetime, timezone
 from pathlib import Path
 
@@ -70,9 +69,7 @@ async def process(document_id: int, session: AsyncSession) -> None:
         doc.ai_model_version = "qwen3.5-35b-a3b"
         doc.ai_processed_at = datetime.now(timezone.utc)
 
-        # ─── Inbox → Knowledge 폴더 이동 ───
-        if doc.file_path.startswith("PKM/Inbox/") and domain:
-            _move_to_knowledge(doc, domain)
+        # 파일은 원본 위치 유지 (물리 이동 없음, DB 메타데이터만 관리)
 
         logger.info(
             f"[분류] document_id={document_id}: "
@@ -83,33 +80,4 @@ async def process(document_id: int, session: AsyncSession) -> None:
         await client.close()
 
 
-def _move_to_knowledge(doc: Document, domain: str):
-    """분류 완료 후 Inbox에서 Knowledge 폴더로 파일 이동"""
-    nas_root = Path(settings.nas_mount_path)
-    src = nas_root / doc.file_path
-
-    if not src.exists():
-        logger.warning(f"[이동] 원본 파일 없음: {src}")
-        return
-
-    # 대상 경로: PKM/{domain}/{파일명}
-    sub_group = doc.ai_sub_group
-    if sub_group:
-        new_rel = f"PKM/{domain}/{sub_group}/{src.name}"
-    else:
-        new_rel = f"PKM/{domain}/{src.name}"
-
-    dst = nas_root / new_rel
-    dst.parent.mkdir(parents=True, exist_ok=True)
-
-    # 중복 파일명 처리
-    counter = 1
-    stem, suffix = dst.stem, dst.suffix
-    while dst.exists():
-        dst = dst.parent / f"{stem}_{counter}{suffix}"
-        new_rel = str(dst.relative_to(nas_root))
-        counter += 1
-
-    shutil.move(str(src), str(dst))
-    doc.file_path = new_rel
-    logger.info(f"[이동] {doc.file_path} → {new_rel}")
+    # _move_to_knowledge 제거됨 — 파일은 원본 위치 유지, 분류는 DB 메타데이터만
diff --git a/app/workers/queue_consumer.py b/app/workers/queue_consumer.py
index 589349e..e31951a 100644
--- a/app/workers/queue_consumer.py
+++ b/app/workers/queue_consumer.py
@@ -34,27 +34,28 @@ async def reset_stale_items():
 
 async def enqueue_next_stage(document_id: int, current_stage: str):
     """현재 stage 완료 후 다음 stage를 pending으로 등록"""
-    next_stages = {"extract": "classify", "classify": "embed", "embed": "preview"}
-    next_stage = next_stages.get(current_stage)
-    if not next_stage:
+    next_stages = {"extract": ["classify", "preview"], "classify": ["embed"]}
+    stages = next_stages.get(current_stage, [])
+    if not stages:
         return
 
     async with async_session() as session:
-        existing = await session.execute(
-            select(ProcessingQueue).where(
-                ProcessingQueue.document_id == document_id,
-                ProcessingQueue.stage == next_stage,
-                ProcessingQueue.status.in_(["pending", "processing"]),
+        for next_stage in stages:
+            existing = await session.execute(
+                select(ProcessingQueue).where(
+                    ProcessingQueue.document_id == document_id,
+                    ProcessingQueue.stage == next_stage,
+                    ProcessingQueue.status.in_(["pending", "processing"]),
+                )
             )
-        )
-        if existing.scalar_one_or_none():
-            return
+            if existing.scalar_one_or_none():
+                continue
 
-        session.add(ProcessingQueue(
-            document_id=document_id,
-            stage=next_stage,
-            status="pending",
-        ))
+            session.add(ProcessingQueue(
+                document_id=document_id,
+                stage=next_stage,
+                status="pending",
+            ))
         await session.commit()
 
 
diff --git a/frontend/src/lib/components/DocumentCard.svelte b/frontend/src/lib/components/DocumentCard.svelte
index 2530d17..2b4f95c 100644
--- a/frontend/src/lib/components/DocumentCard.svelte
+++ b/frontend/src/lib/components/DocumentCard.svelte
@@ -23,6 +23,18 @@
     return `${(bytes / 1048576).toFixed(1)}MB`;
   }
 
+  const DOMAIN_COLORS = {
+    'Knowledge/Philosophy': 'var(--domain-philosophy)',
+    'Knowledge/Language': 'var(--domain-language)',
+    'Knowledge/Engineering': 'var(--domain-engineering)',
+    'Knowledge/Industrial_Safety': 'var(--domain-safety)',
+    'Knowledge/Programming': 'var(--domain-programming)',
+    'Knowledge/General': 'var(--domain-general)',
+    'Reference': 'var(--domain-reference)',
+  };
+
+  let domainColor = $derived(DOMAIN_COLORS[doc.ai_domain] || 'var(--border)');
+
   function handleClick() {
     // 모바일에서는 항상 detail 페이지로 이동
     if (window.innerWidth < 1024) {
@@ -39,9 +51,14 @@
 
 <button
   onclick={handleClick}
-  class="flex items-start gap-3 p-3 bg-[var(--surface)] border rounded-lg hover:border-[var(--accent)] transition-colors group w-full text-left
+  class="flex items-stretch bg-[var(--surface)] border rounded-lg hover:border-[var(--accent)] transition-colors group w-full text-left overflow-hidden
     {selected ? 'border-[var(--accent)] bg-[var(--accent)]/5' : 'border-[var(--border)]'}"
 >
+  <!-- domain 색상 바 -->
+  <div class="w-1 shrink-0 rounded-l-lg" style="background: {domainColor}"></div>
+
+  <!-- 콘텐츠 -->
+  <div class="flex items-start gap-3 p-3 flex-1 min-w-0">
   <!-- 포맷 아이콘 -->
   <div class="shrink-0 mt-0.5 text-[var(--text-dim)] group-hover:text-[var(--accent)]">
     <FormatIcon format={doc.file_format} size={18} />
@@ -86,4 +103,5 @@
       <span class="text-[var(--text-dim)]">{formatSize(doc.file_size)}</span>
     {/if}
   </div>
+  </div>
 </button>