diff --git a/FileShare-Services/Endpoints/AppEndpoints.cs b/FileShare-Services/Endpoints/AppEndpoints.cs
index 782539b..95449a7 100644
--- a/FileShare-Services/Endpoints/AppEndpoints.cs
+++ b/FileShare-Services/Endpoints/AppEndpoints.cs
@@ -86,6 +86,10 @@ namespace FileShare_Services.Endpoints
                     .WithOpenApi("FileLibrary", "永久删除文件（物理文件+数据库记录）。")
                     .WithName("DeleteFile");
 
+                endpoints.MapPost<IFileLibraryEndpointService, CompressFileRequest>("api/files/compress", (service, request, _) => service.CompressFileAsync(request))
+                    .WithOpenApi("FileLibrary", "压缩文件为 ZIP（可选密码）。")
+                    .WithName("CompressFile");
+
                 endpoints.MapGet<IFileLibraryEndpointService, FileQueryRequest>("api/files/detail", (service, request, _) => service.GetFileAsync(request))
                     .WithOpenApi("FileLibrary", "查询文件详情。")
                     .WithName("GetFileDetail");
diff --git a/FileShare-Services/FileShare-Services.csproj b/FileShare-Services/FileShare-Services.csproj
index 79d8126..4bd8e2c 100644
--- a/FileShare-Services/FileShare-Services.csproj
+++ b/FileShare-Services/FileShare-Services.csproj
@@ -9,6 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.7" />
+    <PackageReference Include="DotNetZip" Version="1.16.0" />
     <PackageReference Include="QRCoder" Version="1.8.0" />
     <PackageReference Include="Serilog" Version="4.2.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
diff --git a/FileShare-Services/Services/FileLibrary/FileLibraryContracts.cs b/FileShare-Services/Services/FileLibrary/FileLibraryContracts.cs
index b3073af..0908f78 100644
--- a/FileShare-Services/Services/FileLibrary/FileLibraryContracts.cs
+++ b/FileShare-Services/Services/FileLibrary/FileLibraryContracts.cs
@@ -40,6 +40,12 @@ namespace FileShare_Services.Services.FileLibrary
     public sealed record DeleteFileRequest(
         [property: JsonPropertyName("id")] int Id);
 
+    /// <summary>
+    /// 压缩文件的请求。
+    /// </summary>
+    public sealed record CompressFileRequest(
+        [property: JsonPropertyName("id")] int Id);
+
     /// <summary>
     /// 查询服务器子目录的请求。
     /// </summary>
diff --git a/FileShare-Services/Services/FileLibrary/FileLibraryEndpointService.cs b/FileShare-Services/Services/FileLibrary/FileLibraryEndpointService.cs
index d3e6995..4035988 100644
--- a/FileShare-Services/Services/FileLibrary/FileLibraryEndpointService.cs
+++ b/FileShare-Services/Services/FileLibrary/FileLibraryEndpointService.cs
@@ -121,6 +121,14 @@ namespace FileShare_Services.Services.FileLibrary
             return ResponseHelper.Succeed("文件已永久删除。");
         }
 
+        /// <inheritdoc />
+        public async Task<IApiResponse> CompressFileAsync(CompressFileRequest request)
+        {
+            ValidateFileId(request.Id);
+            await fileLibrary.CompressFileAsync(request.Id);
+            return ResponseHelper.Succeed("文件已压缩。");
+        }
+
         /// <summary>
         /// 验证文件 ID 是否有效，无效时抛出 <see cref="ArgumentException"/>。
         /// </summary>
diff --git a/FileShare-Services/Services/FileLibrary/FileLibraryService.cs b/FileShare-Services/Services/FileLibrary/FileLibraryService.cs
index cb43f03..b1df8fe 100644
--- a/FileShare-Services/Services/FileLibrary/FileLibraryService.cs
+++ b/FileShare-Services/Services/FileLibrary/FileLibraryService.cs
@@ -2,6 +2,7 @@ using FileShare_Common.Core;
 using FileShare_EFCore.Database;
 using FileShare_EFCore.Models;
 using FileShare_Services.Core;
+using Ionic.Zip;
 using Microsoft.EntityFrameworkCore;
 using System.Text;
 
@@ -593,6 +594,36 @@ namespace FileShare_Services.Services.FileLibrary
             await db.SaveChangesAsync(cancellationToken);
         }
 
+        /// <inheritdoc />
+        public async Task CompressFileAsync(int id, CancellationToken cancellationToken = default)
+        {
+            var record = await db.ManagedFileRecords
+                .FirstOrDefaultAsync(f => f.Id == id && f.Exists, cancellationToken)
+                ?? throw new InvalidOperationException("文件不存在。");
+
+            if (!File.Exists(record.AbsolutePath))
+                throw new FileNotFoundException("源文件不存在于磁盘。");
+
+            var dir = Path.GetDirectoryName(record.AbsolutePath)!;
+            var nameWithoutExt = Path.GetFileNameWithoutExtension(record.FileName);
+            var zipPath = Path.Combine(dir, nameWithoutExt + ".zip");
+
+            // 删除已存在的同名 ZIP
+            if (File.Exists(zipPath))
+            {
+                File.Delete(zipPath);
+            }
+
+            // 密码为文件名去掉后缀
+            var zipPassword = nameWithoutExt.ToLower();
+
+            // 创建 ZIP
+            using var zip = new Ionic.Zip.ZipFile();
+            zip.Password = zipPassword;
+            zip.AddFile(record.AbsolutePath, "");
+            zip.Save(zipPath);
+        }
+
         /// <summary>
         /// 深度优先遍历目录树，枚举所有被 <see cref="MediaFileTypes"/> 支持的媒体文件路径。
         /// 遇到无权限的目录时跳过该分支继续遍历。
diff --git a/FileShare-Services/Services/FileLibrary/IFileLibraryEndpointService.cs b/FileShare-Services/Services/FileLibrary/IFileLibraryEndpointService.cs
index c96b327..e71fad5 100644
--- a/FileShare-Services/Services/FileLibrary/IFileLibraryEndpointService.cs
+++ b/FileShare-Services/Services/FileLibrary/IFileLibraryEndpointService.cs
@@ -112,5 +112,12 @@ namespace FileShare_Services.Services.FileLibrary
         /// <param name="request">包含文件 ID 的请求。</param>
         /// <returns>API 响应。</returns>
         Task<IApiResponse> DeleteFileAsync(DeleteFileRequest request);
+
+        /// <summary>
+        /// 压缩指定文件为 ZIP（密码为文件名去掉后缀）。
+        /// </summary>
+        /// <param name="request">包含文件 ID 的请求。</param>
+        /// <returns>API 响应。</returns>
+        Task<IApiResponse> CompressFileAsync(CompressFileRequest request);
     }
 }
diff --git a/FileShare-Services/Services/FileLibrary/IFileLibraryService.cs b/FileShare-Services/Services/FileLibrary/IFileLibraryService.cs
index 691786c..bc9cad2 100644
--- a/FileShare-Services/Services/FileLibrary/IFileLibraryService.cs
+++ b/FileShare-Services/Services/FileLibrary/IFileLibraryService.cs
@@ -128,5 +128,12 @@ namespace FileShare_Services.Services.FileLibrary
         /// <param name="id">文件记录 ID。</param>
         /// <param name="cancellationToken">取消令牌。</param>
         Task DeleteFileAsync(int id, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 将指定文件压缩为 ZIP（密码为文件名去掉后缀），存储在源文件同级目录。
+        /// </summary>
+        /// <param name="id">文件记录 ID。</param>
+        /// <param name="cancellationToken">取消令牌。</param>
+        Task CompressFileAsync(int id, CancellationToken cancellationToken = default);
     }
 }
diff --git a/FileShare-Web-VUE/src/api/index.ts b/FileShare-Web-VUE/src/api/index.ts
index 57887f7..bea9676 100644
--- a/FileShare-Web-VUE/src/api/index.ts
+++ b/FileShare-Web-VUE/src/api/index.ts
@@ -116,5 +116,7 @@ export const api = {
     request('files/progress', { method: 'POST', body: { id, position } }),
   deleteFile: (id: number) =>
     request('files/delete', { method: 'POST', body: { id } }),
+  compressFile: (id: number) =>
+    request('files/compress', { method: 'POST', body: { id } }),
   qrCode: () => request<{ url: string; qrCodeBase64: string }>('qrcode'),
 }
diff --git a/FileShare-Web-VUE/src/components/ClientPage.vue b/FileShare-Web-VUE/src/components/ClientPage.vue
index 4d64568..64a7bba 100644
--- a/FileShare-Web-VUE/src/components/ClientPage.vue
+++ b/FileShare-Web-VUE/src/components/ClientPage.vue
@@ -12,6 +12,7 @@ import RootTabs from './client/RootTabs.vue'
 import SelectedMediaPlayerHost from './client/SelectedMediaPlayerHost.vue'
 import ViewToggle from './client/ViewToggle.vue'
 import QrCodeModal from './QrCodeModal.vue'
+import ConfirmModal from './ConfirmModal.vue'
 
 type MediaPlayerHandle = {
   getVideoElement: () => HTMLVideoElement | null
@@ -36,7 +37,9 @@ const recentLoading = ref(false)
 const viewMode = ref<'list' | 'grid'>('list')
 
 const qrModal = ref<InstanceType<typeof QrCodeModal> | null>(null)
+const confirmModal = ref<InstanceType<typeof ConfirmModal> | null>(null)
 const mediaPlayer = ref<MediaPlayerHandle | null>(null)
+const compressingIds = ref(new Set<number>())
 
 function setMediaPlayer(el: unknown) {
   mediaPlayer.value = (el as MediaPlayerHandle) ?? null
@@ -273,9 +276,13 @@ function exitSearch() {
 }
 
 async function deleteFile(file: FileRecordDto) {
-  if (!window.confirm(`确定要永久删除 "${file.fileName}" 吗？\n\n删除后无法恢复！`)) {
-    return
-  }
+  const confirmed = await confirmModal.value?.open({
+    title: '确认删除',
+    message: `确定要永久删除 "${file.fileName}" 吗？\n\n删除后无法恢复！`,
+    confirmText: '删除',
+    danger: true,
+  })
+  if (!confirmed) return
   try {
     await api.deleteFile(file.id)
     await browseDirectory()
@@ -290,6 +297,30 @@ async function deleteFile(file: FileRecordDto) {
   }
 }
 
+async function compressFile(file: FileRecordDto) {
+  const nameWithoutExt = file.fileName.replace(/\.[^.]+$/, '')
+  const confirmed = await confirmModal.value?.open({
+    title: '确认压缩',
+    message: `确定要将 "${file.fileName}" 压缩为 ZIP 吗？\n\n密码将自动设置为：${nameWithoutExt.toLocaleLowerCase()}`,
+    confirmText: '压缩',
+  })
+  if (!confirmed) return
+  compressingIds.value.add(file.id)
+  try {
+    await api.compressFile(file.id)
+    await confirmModal.value?.open({
+      title: '压缩完成',
+      message: `"${file.fileName}" 已压缩为 "${nameWithoutExt}.zip"。`,
+      showCancel: false,
+      confirmText: '确定',
+    })
+  } catch (error) {
+    setError(error)
+  } finally {
+    compressingIds.value.delete(file.id)
+  }
+}
+
 function updatePlaybackPosition(id: number, position: number) {
   if (selectedFile.value?.id === id) {
     selectedFile.value.playbackPosition = position
@@ -481,7 +512,7 @@ onBeforeUnmount(() => {
       <p v-else-if="searchResults.length === 0" class="empty-state">无匹配文件</p>
       <div v-else-if="viewMode === 'grid'" class="file-grid">
         <template v-for="file in searchResults" :key="file.id">
-          <FileCard :file="file" show-created-time @select="selectSearchFile" @delete="deleteFile" />
+          <FileCard :file="file" show-created-time :compressing="compressingIds.has(file.id)" @select="selectSearchFile" @delete="deleteFile" @compress="compressFile" />
 <SelectedMediaPlayerHost
           v-if="selectedFile?.id === file.id"
           :ref="setMediaPlayer"
@@ -506,7 +537,7 @@ onBeforeUnmount(() => {
       </div>
       <div v-else class="file-list">
         <template v-for="file in searchResults" :key="file.id">
-          <FileListItem :file="file" show-created-time @select="selectSearchFile" @delete="deleteFile" />
+          <FileListItem :file="file" show-created-time :compressing="compressingIds.has(file.id)" @select="selectSearchFile" @delete="deleteFile" @compress="compressFile" />
 <SelectedMediaPlayerHost
           v-if="selectedFile?.id === file.id"
           :ref="setMediaPlayer"
@@ -549,7 +580,7 @@ onBeforeUnmount(() => {
       </p>
       <div v-else-if="viewMode === 'grid'" class="file-grid">
         <template v-for="file in recentFiles" :key="file.id">
-          <FileCard :file="file" :selected="selectedFile?.id === file.id" @select="selectFile" @delete="deleteFile" />
+          <FileCard :file="file" :selected="selectedFile?.id === file.id" :compressing="compressingIds.has(file.id)" @select="selectFile" @delete="deleteFile" @compress="compressFile" />
 <SelectedMediaPlayerHost
           v-if="selectedFile?.id === file.id"
           :ref="setMediaPlayer"
@@ -578,8 +609,10 @@ onBeforeUnmount(() => {
             :file="file"
             :selected="selectedFile?.id === file.id"
             :show-last-played="activeTab === 'recent-played'"
+            :compressing="compressingIds.has(file.id)"
             @select="selectFile"
             @delete="deleteFile"
+            @compress="compressFile"
           />
 <SelectedMediaPlayerHost
           v-if="selectedFile?.id === file.id"
@@ -647,9 +680,11 @@ onBeforeUnmount(() => {
               <FileCard
                 :file="file"
                 :selected="selectedFile?.id === file.id"
+                :compressing="compressingIds.has(file.id)"
                 show-created-time
                 @select="selectFile"
                 @delete="deleteFile"
+                @compress="compressFile"
               />
 <SelectedMediaPlayerHost
           v-if="selectedFile?.id === file.id"
@@ -679,9 +714,11 @@ onBeforeUnmount(() => {
               <FileListItem
                 :file="file"
                 :selected="selectedFile?.id === file.id"
+                :compressing="compressingIds.has(file.id)"
                 show-created-time
                 @select="selectFile"
                 @delete="deleteFile"
+                @compress="compressFile"
               />
 <SelectedMediaPlayerHost
           v-if="selectedFile?.id === file.id"
@@ -726,4 +763,5 @@ onBeforeUnmount(() => {
   </main>
 
   <QrCodeModal ref="qrModal" />
+  <ConfirmModal ref="confirmModal" />
 </template>
diff --git a/FileShare-Web-VUE/src/components/ConfirmModal.vue b/FileShare-Web-VUE/src/components/ConfirmModal.vue
new file mode 100644
index 0000000..ffeb622
--- /dev/null
+++ b/FileShare-Web-VUE/src/components/ConfirmModal.vue
@@ -0,0 +1,60 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+
+const visible = ref(false)
+const title = ref('')
+const message = ref('')
+const confirmText = ref('确定')
+const cancelText = ref('取消')
+const showCancel = ref(true)
+const danger = ref(false)
+let resolvePromise: (value: boolean) => void = () => {}
+
+function open(options: { title: string; message: string; confirmText?: string; cancelText?: string; showCancel?: boolean; danger?: boolean }) {
+  title.value = options.title
+  message.value = options.message
+  confirmText.value = options.confirmText ?? '确定'
+  cancelText.value = options.cancelText ?? '取消'
+  showCancel.value = options.showCancel ?? true
+  danger.value = options.danger ?? false
+  visible.value = true
+  return new Promise<boolean>((resolve) => { resolvePromise = resolve })
+}
+
+function confirm() { visible.value = false; resolvePromise(true) }
+function cancel() { visible.value = false; resolvePromise(false) }
+
+defineExpose({ open })
+</script>
+
+<template>
+  <Teleport to="body">
+    <div v-if="visible" class="modal-overlay" @click.self="cancel">
+      <div class="modal-box">
+        <h3>{{ title }}</h3>
+        <p>{{ message }}</p>
+        <div class="modal-actions">
+          <button v-if="showCancel" type="button" class="secondary-button" @click="cancel">{{ cancelText }}</button>
+          <button type="button" :class="danger ? 'danger-button' : 'primary-button'" @click="confirm">{{ confirmText }}</button>
+        </div>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.modal-overlay {
+  position: fixed; inset: 0; z-index: 1000;
+  background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center;
+}
+.modal-box {
+  background: #fff; border-radius: 8px; padding: 24px; min-width: 320px; max-width: 420px;
+  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
+}
+.modal-box h3 { margin: 0 0 12px; font-size: 16px; }
+.modal-box p { margin: 0 0 20px; color: #555; line-height: 1.5; white-space: pre-line; }
+.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
+.primary-button { padding: 6px 16px; border: none; border-radius: 4px; background: #3182ce; color: #fff; cursor: pointer; }
+.danger-button { padding: 6px 16px; border: none; border-radius: 4px; background: #e53e3e; color: #fff; cursor: pointer; }
+.secondary-button { padding: 6px 16px; border: 1px solid #ccc; border-radius: 4px; background: #fff; cursor: pointer; }
+</style>
diff --git a/FileShare-Web-VUE/src/components/client/FileCard.vue b/FileShare-Web-VUE/src/components/client/FileCard.vue
index 2afd156..2320a1f 100644
--- a/FileShare-Web-VUE/src/components/client/FileCard.vue
+++ b/FileShare-Web-VUE/src/components/client/FileCard.vue
@@ -6,11 +6,13 @@ defineProps<{
   file: FileRecordDto
   selected?: boolean
   showCreatedTime?: boolean
+  compressing?: boolean
 }>()
 
 defineEmits<{
   select: [file: FileRecordDto]
   delete: [file: FileRecordDto]
+  compress: [file: FileRecordDto]
 }>()
 </script>
 
@@ -22,6 +24,12 @@ defineEmits<{
     @click="$emit('select', file)"
   >
     <span class="delete-btn" @click.stop="$emit('delete', file)" title="永久删除">删除</span>
+    <span
+      class="compress-btn"
+      :class="{ disabled: compressing }"
+      @click.stop="!compressing && $emit('compress', file)"
+      :title="compressing ? '压缩中...' : '压缩为ZIP'"
+    >{{ compressing ? '压缩中...' : '压缩' }}</span>
     <img
       v-if="file.thumbnailUrl"
       :src="api.thumbnailUrl(file.thumbnailUrl)"
@@ -56,10 +64,33 @@ defineEmits<{
   opacity: 0;
   transition: opacity 0.15s;
 }
-.file-card:hover .delete-btn {
+.compress-btn {
+  position: absolute;
+  top: 4px;
+  right: 52px;
+  padding: 2px 8px;
+  border-radius: 4px;
+  background: rgba(0, 0, 0, 0.6);
+  color: #fff;
+  font-size: 12px;
+  line-height: 18px;
+  cursor: pointer;
+  opacity: 0;
+  transition: opacity 0.15s;
+}
+.compress-btn.disabled {
+  opacity: 1;
+  background: rgba(0, 0, 0, 0.4);
+  cursor: not-allowed;
+}
+.file-card:hover .delete-btn,
+.file-card:hover .compress-btn {
   opacity: 1;
 }
 .delete-btn:hover {
   background: #e53e3e;
 }
+.compress-btn:hover:not(.disabled) {
+  background: #3182ce;
+}
 </style>
diff --git a/FileShare-Web-VUE/src/components/client/FileListItem.vue b/FileShare-Web-VUE/src/components/client/FileListItem.vue
index c4da866..55797c2 100644
--- a/FileShare-Web-VUE/src/components/client/FileListItem.vue
+++ b/FileShare-Web-VUE/src/components/client/FileListItem.vue
@@ -7,11 +7,13 @@ defineProps<{
   selected?: boolean
   showCreatedTime?: boolean
   showLastPlayed?: boolean
+  compressing?: boolean
 }>()
 
 defineEmits<{
   select: [file: FileRecordDto]
   delete: [file: FileRecordDto]
+  compress: [file: FileRecordDto]
 }>()
 </script>
 
@@ -39,12 +41,17 @@ defineEmits<{
       </small>
       <small v-if="showCreatedTime && formatCreatedTime(file)">{{ formatCreatedTime(file) }}</small>
     </span>
+    <span
+      class="compress-btn"
+      :class="{ disabled: compressing }"
+      @click.stop="!compressing && $emit('compress', file)"
+    >{{ compressing ? '压缩中...' : '压缩' }}</span>
     <span class="delete-btn" @click.stop="$emit('delete', file)" title="永久删除">删除</span>
   </button>
 </template>
 
 <style scoped>
-.delete-btn {
+.compress-btn {
   margin-left: auto;
   padding: 2px 10px;
   border-radius: 4px;
@@ -57,9 +64,31 @@ defineEmits<{
   opacity: 0;
   transition: opacity 0.15s;
 }
+.compress-btn.disabled {
+  opacity: 1;
+  color: #bbb;
+  cursor: not-allowed;
+}
+.delete-btn {
+  padding: 2px 10px;
+  border-radius: 4px;
+  background: rgba(0, 0, 0, 0.06);
+  color: #999;
+  font-size: 12px;
+  line-height: 20px;
+  cursor: pointer;
+  flex-shrink: 0;
+  opacity: 0;
+  transition: opacity 0.15s;
+}
+.mobile-file:hover .compress-btn,
 .mobile-file:hover .delete-btn {
   opacity: 1;
 }
+.compress-btn:hover:not(.disabled) {
+  background: #3182ce;
+  color: #fff;
+}
 .delete-btn:hover {
   background: #e53e3e;
   color: #fff;
diff --git a/docs/compose/plans/2026-07-09-file-compress.md b/docs/compose/plans/2026-07-09-file-compress.md
new file mode 100644
index 0000000..5c9bdb6
--- /dev/null
+++ b/docs/compose/plans/2026-07-09-file-compress.md
@@ -0,0 +1,454 @@
+# File Compress Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use compose:subagent (recommended) or compose:execute to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add single-file ZIP compression with password support and custom modal dialogs.
+
+**Architecture:** Backend adds `POST api/files/compress` using DotNetZip for encrypted ZIP. Frontend adds ConfirmModal + CompressModal components, replaces all system dialogs.
+
+**Tech Stack:** ASP.NET Core 10, DotNetZip, Vue 3.5, TypeScript 6
+
+## Global Constraints
+
+- Do not edit `FileShare-EFCore/Migrations/**`
+- All endpoints use POST (project convention)
+- Follow existing patterns: sealed record DTOs, ResponseHelper, Teleport modal pattern
+
+## File Map
+
+| File | Action | Purpose |
+|------|--------|---------|
+| `FileShare-Services/FileShare-Services.csproj` | Modify | Add DotNetZip package |
+| `FileShare-Services/Services/FileLibrary/FileLibraryContracts.cs` | Modify | Add CompressFileRequest DTO |
+| `FileShare-Services/Services/FileLibrary/IFileCompressionService.cs` | Create | Compression service interface |
+| `FileShare-Services/Services/FileLibrary/FileCompressionService.cs` | Create | Compression implementation |
+| `FileShare-Services/Services/FileLibrary/IFileCompressionEndpointService.cs` | Create | Endpoint interface |
+| `FileShare-Services/Services/FileLibrary/FileCompressionEndpointService.cs` | Create | Endpoint adapter |
+| `FileShare-Services/Endpoints/AppEndpoints.cs` | Modify | Register route |
+| `FileShare-API/Configuration/ServicesConfiguration.cs` | Modify | Register DI |
+| `FileShare-Web-VUE/src/api/index.ts` | Modify | Add compressFile API |
+| `FileShare-Web-VUE/src/components/ConfirmModal.vue` | Create | Generic confirm dialog |
+| `FileShare-Web-VUE/src/components/CompressModal.vue` | Create | Compress password dialog |
+| `FileShare-Web-VUE/src/components/client/FileCard.vue` | Modify | Add compress button |
+| `FileShare-Web-VUE/src/components/client/FileListItem.vue` | Modify | Add compress button |
+| `FileShare-Web-VUE/src/components/ClientPage.vue` | Modify | Handle compress + replace system dialogs |
+
+---
+
+## Task 1: Backend — Package, DTO, Service Interface
+
+- [ ] **Step 1: Add DotNetZip to FileShare-Services.csproj**
+
+Add to `<ItemGroup>` with other PackageReferences:
+```xml
+<PackageReference Include="DotNetZip" Version="1.16.0" />
+```
+
+- [ ] **Step 2: Add CompressFileRequest to FileLibraryContracts.cs**
+
+After `DeleteFileRequest`, add:
+```csharp
+    /// <summary>
+    /// 压缩文件的请求。
+    /// </summary>
+    public sealed record CompressFileRequest(
+        [property: JsonPropertyName("id")] int Id,
+        [property: JsonPropertyName("password")] string? Password = null,
+        [property: JsonPropertyName("useDefaultPassword")] bool UseDefaultPassword = true);
+```
+
+- [ ] **Step 3: Create IFileCompressionService.cs**
+
+```csharp
+namespace FileShare_Services.Services.FileLibrary
+{
+    public interface IFileCompressionService
+    {
+        Task CompressFileAsync(int id, string? password, bool useDefaultPassword, CancellationToken cancellationToken = default);
+    }
+}
+```
+
+- [ ] **Step 4: Create IFileCompressionEndpointService.cs**
+
+```csharp
+using FileShare_Common.Core;
+
+namespace FileShare_Services.Services.FileLibrary
+{
+    public interface IFileCompressionEndpointService
+    {
+        Task<IApiResponse> CompressFileAsync(CompressFileRequest request);
+    }
+}
+```
+
+---
+
+## Task 2: Backend — Service Implementation
+
+- [ ] **Step 1: Create FileCompressionService.cs**
+
+```csharp
+using FileShare_EFCore.Database;
+using FileShare_EFCore.Models;
+using Microsoft.EntityFrameworkCore;
+using System.IO.Compression;
+
+namespace FileShare_Services.Services.FileLibrary
+{
+    public sealed class FileCompressionService(AppDataContext db) : IFileCompressionService
+    {
+        public async Task CompressFileAsync(int id, string? password, bool useDefaultPassword, CancellationToken cancellationToken = default)
+        {
+            var record = await db.ManagedFileRecords
+                .FirstOrDefaultAsync(f => f.Id == id && f.Exists, cancellationToken)
+                ?? throw new InvalidOperationException("文件不存在。");
+
+            if (!File.Exists(record.AbsolutePath))
+                throw new FileNotFoundException("源文件不存在于磁盘。");
+
+            var dir = Path.GetDirectoryName(record.AbsolutePath)!;
+            var nameWithoutExt = Path.GetFileNameWithoutExtension(record.FileName);
+            var zipPath = Path.Combine(dir, nameWithoutExt + ".zip");
+
+            // 删除已存在的同名 ZIP
+            if (File.Exists(zipPath))
+            {
+                File.Delete(zipPath);
+            }
+
+            // 确定密码
+            string? zipPassword = ResolvePassword(record.FileName, password, useDefaultPassword);
+
+            // 创建 ZIP
+            using (var archive = ZipFile.Open(zipPath, ZipArchiveMode.Create))
+            {
+                archive.CreateEntryFromFile(record.AbsolutePath, record.FileName, CompressionLevel.Optimal);
+                // DotNetZip 不支持 ZipArchive 密码，改用 DotNetZip 的 ZipFile
+            }
+
+            // 使用 DotNetZip 重新创建（支持密码）
+            System.IO.Compression.ZipFile.Delete(zipPath);
+            using (var zip = new Ionic.Zip.ZipFile())
+            {
+                zip.Password = zipPassword;
+                zip.AddFile(record.AbsolutePath, "");
+                zip.Save(zipPath);
+            }
+        }
+
+        private static string? ResolvePassword(string fileName, string? password, bool useDefaultPassword)
+        {
+            if (useDefaultPassword)
+                return Path.GetFileNameWithoutExtension(fileName);
+            return string.IsNullOrEmpty(password) ? null : password;
+        }
+    }
+}
+```
+
+Wait — this mixes `System.IO.Compression` and `Ionic.Zip`. Let me use only DotNetZip.
+
+- [ ] **Step 1 (revised): Create FileCompressionService.cs**
+
+```csharp
+using FileShare_EFCore.Database;
+using FileShare_EFCore.Models;
+using Ionic.Zip;
+using Microsoft.EntityFrameworkCore;
+
+namespace FileShare_Services.Services.FileLibrary
+{
+    public sealed class FileCompressionService(AppDataContext db) : IFileCompressionService
+    {
+        public async Task CompressFileAsync(int id, string? password, bool useDefaultPassword, CancellationToken cancellationToken = default)
+        {
+            var record = await db.ManagedFileRecords
+                .FirstOrDefaultAsync(f => f.Id == id && f.Exists, cancellationToken)
+                ?? throw new InvalidOperationException("文件不存在。");
+
+            if (!File.Exists(record.AbsolutePath))
+                throw new FileNotFoundException("源文件不存在于磁盘。");
+
+            var dir = Path.GetDirectoryName(record.AbsolutePath)!;
+            var nameWithoutExt = Path.GetFileNameWithoutExtension(record.FileName);
+            var zipPath = Path.Combine(dir, nameWithoutExt + ".zip");
+
+            // 删除已存在的同名 ZIP
+            if (File.Exists(zipPath))
+            {
+                File.Delete(zipPath);
+            }
+
+            // 确定密码
+            var zipPassword = ResolvePassword(record.FileName, password, useDefaultPassword);
+
+            // 创建 ZIP
+            using var zip = new ZipFile();
+            if (zipPassword is not null)
+            {
+                zip.Password = zipPassword;
+            }
+            zip.AddFile(record.AbsolutePath, "");
+            zip.Save(zipPath);
+        }
+
+        private static string? ResolvePassword(string fileName, string? password, bool useDefaultPassword)
+        {
+            if (useDefaultPassword)
+                return Path.GetFileNameWithoutExtension(fileName);
+            return string.IsNullOrEmpty(password) ? null : password;
+        }
+    }
+}
+```
+
+---
+
+## Task 3: Backend — Endpoint + Route + DI
+
+- [ ] **Step 1: Create FileCompressionEndpointService.cs**
+
+```csharp
+using FileShare_Common.Core;
+
+namespace FileShare_Services.Services.FileLibrary
+{
+    public sealed class FileCompressionEndpointService(IFileCompressionService compressionService) : IFileCompressionEndpointService
+    {
+        public async Task<IApiResponse> CompressFileAsync(CompressFileRequest request)
+        {
+            if (request.Id <= 0)
+                return ResponseHelper.Failure(400, "文件 ID 无效。");
+
+            await compressionService.CompressFileAsync(request.Id, request.Password, request.UseDefaultPassword);
+            return ResponseHelper.Succeed("文件已压缩。");
+        }
+    }
+}
+```
+
+- [ ] **Step 2: Register route in AppEndpoints.cs**
+
+After the `DeleteFile` endpoint, add:
+```csharp
+endpoints.MapPost<IFileCompressionEndpointService, CompressFileRequest>("api/files/compress", (service, request, _) => service.CompressFileAsync(request))
+    .WithOpenApi("FileLibrary", "压缩文件为 ZIP（可选密码）。")
+    .WithName("CompressFile");
+```
+
+- [ ] **Step 3: Register DI in ServicesConfiguration.cs**
+
+After `IFileLibraryEndpointService` registration, add:
+```csharp
+services.AddScoped<IFileCompressionService, FileCompressionService>();
+services.AddScoped<IFileCompressionEndpointService, FileCompressionEndpointService>();
+```
+
+---
+
+## Task 4: Frontend — API + Modal Components
+
+- [ ] **Step 1: Add compressFile API method**
+
+In `api/index.ts`, add:
+```typescript
+compressFile: (id: number, password?: string | null, useDefaultPassword = true) =>
+    request('files/compress', { method: 'POST', body: { id, password, useDefaultPassword } }),
+```
+
+- [ ] **Step 2: Create ConfirmModal.vue**
+
+```vue
+<script setup lang="ts">
+import { ref } from 'vue'
+
+const visible = ref(false)
+const title = ref('')
+const message = ref('')
+const confirmText = ref('确定')
+const cancelText = ref('取消')
+const showCancel = ref(true)
+const danger = ref(false)
+let resolvePromise: (value: boolean) => void = () => {}
+
+function open(options: { title: string; message: string; confirmText?: string; cancelText?: string; showCancel?: boolean; danger?: boolean }) {
+  title.value = options.title
+  message.value = options.message
+  confirmText.value = options.confirmText ?? '确定'
+  cancelText.value = options.cancelText ?? '取消'
+  showCancel.value = options.showCancel ?? true
+  danger.value = options.danger ?? false
+  visible.value = true
+  return new Promise<boolean>((resolve) => { resolvePromise = resolve })
+}
+
+function confirm() { visible.value = false; resolvePromise(true) }
+function cancel() { visible.value = false; resolvePromise(false) }
+
+defineExpose({ open })
+</script>
+
+<template>
+  <Teleport to="body">
+    <div v-if="visible" class="modal-overlay" @click.self="cancel">
+      <div class="modal-box">
+        <h3>{{ title }}</h3>
+        <p>{{ message }}</p>
+        <div class="modal-actions">
+          <button v-if="showCancel" type="button" class="secondary-button" @click="cancel">{{ cancelText }}</button>
+          <button type="button" :class="danger ? 'danger-button' : 'primary-button'" @click="confirm">{{ confirmText }}</button>
+        </div>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.modal-overlay {
+  position: fixed; inset: 0; z-index: 1000;
+  background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center;
+}
+.modal-box {
+  background: #fff; border-radius: 8px; padding: 24px; min-width: 320px; max-width: 420px;
+  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
+}
+.modal-box h3 { margin: 0 0 12px; font-size: 16px; }
+.modal-box p { margin: 0 0 20px; color: #555; line-height: 1.5; }
+.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
+.primary-button { padding: 6px 16px; border: none; border-radius: 4px; background: #3182ce; color: #fff; cursor: pointer; }
+.danger-button { padding: 6px 16px; border: none; border-radius: 4px; background: #e53e3e; color: #fff; cursor: pointer; }
+.secondary-button { padding: 6px 16px; border: 1px solid #ccc; border-radius: 4px; background: #fff; cursor: pointer; }
+</style>
+```
+
+- [ ] **Step 3: Create CompressModal.vue**
+
+```vue
+<script setup lang="ts">
+import { ref, computed } from 'vue'
+
+const visible = ref(false)
+const fileName = ref('')
+const mode = ref<'none' | 'default' | 'custom'>('default')
+const customPassword = ref('')
+let resolvePromise: (value: { password: string | null; useDefaultPassword: boolean } | null) => void = () => {}
+
+const defaultPassword = computed(() => {
+  const dotIndex = fileName.value.lastIndexOf('.')
+  return dotIndex > 0 ? fileName.value.substring(0, dotIndex) : fileName.value
+})
+
+function open(name: string) {
+  fileName.value = name
+  mode.value = 'default'
+  customPassword.value = ''
+  visible.value = true
+  return new Promise<{ password: string | null; useDefaultPassword: boolean } | null>((resolve) => {
+    resolvePromise = resolve
+  })
+}
+
+function confirm() {
+  visible.value = false
+  if (mode.value === 'none') {
+    resolvePromise({ password: null, useDefaultPassword: false })
+  } else if (mode.value === 'default') {
+    resolvePromise({ password: null, useDefaultPassword: true })
+  } else {
+    resolvePromise({ password: customPassword.value || null, useDefaultPassword: false })
+  }
+}
+
+function cancel() {
+  visible.value = false
+  resolvePromise(null)
+}
+
+defineExpose({ open })
+</script>
+
+<template>
+  <Teleport to="body">
+    <div v-if="visible" class="modal-overlay" @click.self="cancel">
+      <div class="modal-box">
+        <h3>压缩文件</h3>
+        <p class="file-name">{{ fileName }}</p>
+        <div class="password-options">
+          <label class="radio-item">
+            <input type="radio" v-model="mode" value="none" />
+            <span>不设置密码</span>
+          </label>
+          <label class="radio-item">
+            <input type="radio" v-model="mode" value="default" />
+            <span>使用默认密码：<code>{{ defaultPassword }}</code></span>
+          </label>
+          <label class="radio-item">
+            <input type="radio" v-model="mode" value="custom" />
+            <span>自定义密码</span>
+          </label>
+          <input
+            v-if="mode === 'custom'"
+            v-model="customPassword"
+            type="text"
+            class="password-input"
+            placeholder="请输入密码"
+          />
+        </div>
+        <div class="modal-actions">
+          <button type="button" class="secondary-button" @click="cancel">取消</button>
+          <button type="button" class="primary-button" @click="confirm">压缩</button>
+        </div>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.modal-overlay {
+  position: fixed; inset: 0; z-index: 1000;
+  background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center;
+}
+.modal-box {
+  background: #fff; border-radius: 8px; padding: 24px; min-width: 360px; max-width: 440px;
+  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
+}
+.modal-box h3 { margin: 0 0 8px; font-size: 16px; }
+.file-name { margin: 0 0 16px; color: #555; font-size: 14px; }
+.password-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
+.radio-item { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 14px; }
+.radio-item code { background: #f0f0f0; padding: 1px 6px; border-radius: 3px; font-size: 13px; }
+.password-input {
+  margin-left: 24px; padding: 6px 10px; border: 1px solid #ccc; border-radius: 4px;
+  font-size: 14px; width: 200px;
+}
+.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
+.primary-button { padding: 6px 16px; border: none; border-radius: 4px; background: #3182ce; color: #fff; cursor: pointer; }
+.secondary-button { padding: 6px 16px; border: 1px solid #ccc; border-radius: 4px; background: #fff; cursor: pointer; }
+</style>
+```
+
+---
+
+## Task 5: Frontend — Wire Components + Replace System Dialogs
+
+- [ ] **Step 1: Add compress buttons to FileCard.vue and FileListItem.vue**
+
+Add `compress` emit and button to both components (similar to delete button pattern).
+
+- [ ] **Step 2: Update ClientPage.vue**
+
+- Import ConfirmModal and CompressModal
+- Add refs for modal instances
+- Add `compressingIds` ref (Set<number> tracking)
+- Replace `window.confirm` in `deleteFile` with ConfirmModal
+- Add `compressFile` handler using CompressModal
+- Wire `@compress` events on all FileCard/FileListItem instances
+
+- [ ] **Step 3: Verify build**
+
+```bash
+dotnet build FileShare-API/FileShare-API.csproj
+cd FileShare-Web-VUE && npx vue-tsc --noEmit
+```