diff --git a/app/api/documents.py b/app/api/documents.py
index affaa43..714e3d0 100644
--- a/app/api/documents.py
+++ b/app/api/documents.py
@@ -36,6 +36,7 @@ class DocumentResponse(BaseModel):
     ai_sub_group: str | None
     ai_tags: list | None
     ai_summary: str | None
+    user_note: str | None
     source_channel: str | None
     data_origin: str | None
     extracted_at: datetime | None
@@ -60,6 +61,7 @@ class DocumentUpdate(BaseModel):
     ai_domain: str | None = None
     ai_sub_group: str | None = None
     ai_tags: list | None = None
+    user_note: str | None = None
     source_channel: str | None = None
     data_origin: str | None = None
 
diff --git a/app/models/document.py b/app/models/document.py
index 4352852..ce56d94 100644
--- a/app/models/document.py
+++ b/app/models/document.py
@@ -44,6 +44,9 @@ class Document(Base):
     embed_model_version: Mapped[str | None] = mapped_column(String(50))
     embedded_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
 
+    # 사용자 메모
+    user_note: Mapped[str | None] = mapped_column(Text)
+
     # 메타데이터
     source_channel: Mapped[str | None] = mapped_column(
         Enum("law_monitor", "devonagent", "email", "web_clip",
diff --git a/frontend/src/lib/components/DocumentCard.svelte b/frontend/src/lib/components/DocumentCard.svelte
index aa3443a..2530d17 100644
--- a/frontend/src/lib/components/DocumentCard.svelte
+++ b/frontend/src/lib/components/DocumentCard.svelte
@@ -24,6 +24,11 @@
   }
 
   function handleClick() {
+    // 모바일에서는 항상 detail 페이지로 이동
+    if (window.innerWidth < 1024) {
+      goto(`/documents/${doc.id}`);
+      return;
+    }
     if (onselect) {
       onselect(doc);
     } else {
diff --git a/frontend/src/lib/components/PreviewPanel.svelte b/frontend/src/lib/components/PreviewPanel.svelte
index 603a14f..de9459c 100644
--- a/frontend/src/lib/components/PreviewPanel.svelte
+++ b/frontend/src/lib/components/PreviewPanel.svelte
@@ -1,10 +1,79 @@
 <script>
-  import { X, ExternalLink } from 'lucide-svelte';
+  import { X, ExternalLink, Plus, Save } from 'lucide-svelte';
+  import { api } from '$lib/api';
+  import { addToast } from '$lib/stores/ui';
   import FormatIcon from './FormatIcon.svelte';
   import TagPill from './TagPill.svelte';
 
   let { doc, onclose } = $props();
 
+  // 메모 상태
+  let noteText = $state('');
+  let noteEditing = $state(false);
+  let noteSaving = $state(false);
+
+  // 태그 편집
+  let newTag = $state('');
+  let tagEditing = $state(false);
+
+  // doc 변경 시 메모 초기화
+  $effect(() => {
+    if (doc) {
+      noteText = doc.user_note || '';
+      noteEditing = false;
+      tagEditing = false;
+      newTag = '';
+    }
+  });
+
+  async function saveNote() {
+    noteSaving = true;
+    try {
+      await api(`/documents/${doc.id}`, {
+        method: 'PATCH',
+        body: JSON.stringify({ user_note: noteText }),
+      });
+      doc.user_note = noteText;
+      noteEditing = false;
+      addToast('success', '메모 저장됨');
+    } catch (err) {
+      addToast('error', '메모 저장 실패');
+    } finally {
+      noteSaving = false;
+    }
+  }
+
+  async function addTag() {
+    const tag = newTag.trim();
+    if (!tag) return;
+    const updatedTags = [...(doc.ai_tags || []), tag];
+    try {
+      await api(`/documents/${doc.id}`, {
+        method: 'PATCH',
+        body: JSON.stringify({ ai_tags: updatedTags }),
+      });
+      doc.ai_tags = updatedTags;
+      newTag = '';
+      addToast('success', '태그 추가됨');
+    } catch (err) {
+      addToast('error', '태그 추가 실패');
+    }
+  }
+
+  async function removeTag(tagToRemove) {
+    const updatedTags = (doc.ai_tags || []).filter(t => t !== tagToRemove);
+    try {
+      await api(`/documents/${doc.id}`, {
+        method: 'PATCH',
+        body: JSON.stringify({ ai_tags: updatedTags }),
+      });
+      doc.ai_tags = updatedTags;
+      addToast('success', '태그 삭제됨');
+    } catch (err) {
+      addToast('error', '태그 삭제 실패');
+    }
+  }
+
   function formatDate(dateStr) {
     if (!dateStr) return '-';
     return new Date(dateStr).toLocaleDateString('ko-KR', { year: 'numeric', month: 'short', day: 'numeric' });
@@ -25,40 +94,83 @@
       <FormatIcon format={doc.file_format} size={16} />
       <span class="text-sm font-medium truncate">{doc.title || '제목 없음'}</span>
     </div>
-    <button onclick={onclose} class="p-1 rounded hover:bg-[var(--surface)] text-[var(--text-dim)]" aria-label="닫기">
-      <X size={16} />
-    </button>
+    <div class="flex items-center gap-1">
+      <a href="/documents/{doc.id}" class="p-1 rounded hover:bg-[var(--surface)] text-[var(--text-dim)]" title="전체 보기">
+        <ExternalLink size={14} />
+      </a>
+      <button onclick={onclose} class="p-1 rounded hover:bg-[var(--surface)] text-[var(--text-dim)]" aria-label="닫기">
+        <X size={16} />
+      </button>
+    </div>
   </div>
 
   <div class="flex-1 p-4 space-y-4">
-    <!-- 전체 보기 버튼 -->
-    <a
-      href="/documents/{doc.id}"
-      class="flex items-center justify-center gap-2 w-full px-3 py-2 bg-[var(--accent)] text-white text-sm rounded-lg hover:bg-[var(--accent-hover)] transition-colors"
-    >
-      <ExternalLink size={14} />
-      전체 보기
-    </a>
-
-    <!-- AI 요약 -->
-    {#if doc.ai_summary}
-      <div>
-        <h4 class="text-xs font-semibold text-[var(--text-dim)] uppercase mb-1.5">AI 요약</h4>
-        <p class="text-sm leading-relaxed">{doc.ai_summary}</p>
-      </div>
-    {/if}
+    <!-- 메모 -->
+    <div>
+      <h4 class="text-xs font-semibold text-[var(--text-dim)] uppercase mb-1.5">메모</h4>
+      {#if noteEditing}
+        <textarea
+          bind:value={noteText}
+          class="w-full h-24 px-3 py-2 bg-[var(--bg)] border border-[var(--border)] rounded-lg text-sm text-[var(--text)] resize-none outline-none focus:border-[var(--accent)]"
+          placeholder="메모 입력..."
+        ></textarea>
+        <div class="flex gap-2 mt-1.5">
+          <button
+            onclick={saveNote}
+            disabled={noteSaving}
+            class="flex items-center gap-1 px-2 py-1 text-xs bg-[var(--accent)] text-white rounded hover:bg-[var(--accent-hover)] disabled:opacity-50"
+          >
+            <Save size={12} /> 저장
+          </button>
+          <button
+            onclick={() => { noteEditing = false; noteText = doc.user_note || ''; }}
+            class="px-2 py-1 text-xs text-[var(--text-dim)] hover:text-[var(--text)]"
+          >취소</button>
+        </div>
+      {:else}
+        <button
+          onclick={() => noteEditing = true}
+          class="w-full text-left px-3 py-2 bg-[var(--bg)] border border-[var(--border)] rounded-lg text-sm min-h-[40px]
+            {noteText ? 'text-[var(--text)]' : 'text-[var(--text-dim)]'}"
+        >
+          {noteText || '메모 추가...'}
+        </button>
+      {/if}
+    </div>
 
     <!-- 태그 -->
-    {#if doc.ai_tags?.length}
-      <div>
-        <h4 class="text-xs font-semibold text-[var(--text-dim)] uppercase mb-1.5">태그</h4>
-        <div class="flex flex-wrap gap-1">
-          {#each doc.ai_tags as tag}
-            <TagPill {tag} />
-          {/each}
-        </div>
+    <div>
+      <h4 class="text-xs font-semibold text-[var(--text-dim)] uppercase mb-1.5">태그</h4>
+      <div class="flex flex-wrap gap-1 mb-2">
+        {#each doc.ai_tags || [] as tag}
+          <span class="inline-flex items-center gap-0.5">
+            <TagPill {tag} clickable={false} />
+            <button
+              onclick={() => removeTag(tag)}
+              class="text-[var(--text-dim)] hover:text-[var(--error)] text-[10px]"
+              title="삭제"
+            >×</button>
+          </span>
+        {/each}
       </div>
-    {/if}
+      {#if tagEditing}
+        <form onsubmit={(e) => { e.preventDefault(); addTag(); }} class="flex gap-1">
+          <input
+            bind:value={newTag}
+            placeholder="태그 입력..."
+            class="flex-1 px-2 py-1 bg-[var(--bg)] border border-[var(--border)] rounded text-xs text-[var(--text)] outline-none focus:border-[var(--accent)]"
+          />
+          <button type="submit" class="px-2 py-1 text-xs bg-[var(--accent)] text-white rounded">추가</button>
+        </form>
+      {:else}
+        <button
+          onclick={() => tagEditing = true}
+          class="flex items-center gap-1 text-xs text-[var(--text-dim)] hover:text-[var(--accent)]"
+        >
+          <Plus size={12} /> 태그 추가
+        </button>
+      {/if}
+    </div>
 
     <!-- 메타 정보 -->
     <div>
diff --git a/frontend/src/lib/components/Sidebar.svelte b/frontend/src/lib/components/Sidebar.svelte
index 898069e..65596b2 100644
--- a/frontend/src/lib/components/Sidebar.svelte
+++ b/frontend/src/lib/components/Sidebar.svelte
@@ -2,7 +2,7 @@
   import { page } from '$app/stores';
   import { goto } from '$app/navigation';
   import { api } from '$lib/api';
-  import { ChevronRight, ChevronDown, FolderOpen, Folder, Inbox } from 'lucide-svelte';
+  import { ChevronRight, ChevronDown, FolderOpen, Folder, Inbox, Clock, Mail, Scale } from 'lucide-svelte';
 
   let tree = $state([]);
   let inboxCount = $state(0);
@@ -182,6 +182,29 @@
     {/if}
   </nav>
 
+  <!-- 스마트 그룹 -->
+  <div class="px-2 py-2 border-t border-[var(--border)]">
+    <h3 class="px-3 py-1 text-[10px] font-semibold text-[var(--text-dim)] uppercase tracking-wider">스마트 그룹</h3>
+    <button
+      onclick={() => { const d = new Date(); d.setDate(d.getDate() - 7); navigate(null, null); const params = new URLSearchParams($page.url.searchParams); params.delete('domain'); params.delete('sub_group'); params.delete('page'); const qs = params.toString(); goto(`/documents${qs ? '?' + qs : ''}`, { noScroll: true }); }}
+      class="w-full flex items-center gap-2 px-3 py-1.5 rounded-md text-sm text-[var(--text-dim)] hover:bg-[var(--surface)] hover:text-[var(--text)]"
+    >
+      <Clock size={14} /> 최근 7일
+    </button>
+    <button
+      onclick={() => { const params = new URLSearchParams(); params.set('source', 'law_monitor'); goto(`/documents?${params}`, { noScroll: true }); }}
+      class="w-full flex items-center gap-2 px-3 py-1.5 rounded-md text-sm text-[var(--text-dim)] hover:bg-[var(--surface)] hover:text-[var(--text)]"
+    >
+      <Scale size={14} /> 법령 알림
+    </button>
+    <button
+      onclick={() => { const params = new URLSearchParams(); params.set('source', 'email'); goto(`/documents?${params}`, { noScroll: true }); }}
+      class="w-full flex items-center gap-2 px-3 py-1.5 rounded-md text-sm text-[var(--text-dim)] hover:bg-[var(--surface)] hover:text-[var(--text)]"
+    >
+      <Mail size={14} /> 이메일
+    </button>
+  </div>
+
   <!-- 하단: Inbox -->
   <div class="px-2 py-2 border-t border-[var(--border)]">
     <a
diff --git a/migrations/004_user_note.sql b/migrations/004_user_note.sql
new file mode 100644
index 0000000..2b2cc9f
--- /dev/null
+++ b/migrations/004_user_note.sql
@@ -0,0 +1,2 @@
+-- 사용자 메모 컬럼 추가
+ALTER TABLE documents ADD COLUMN IF NOT EXISTS user_note TEXT;