diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8420aea..24f52ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   deletion (#33, #43, #46, #48).
 - Windows: six-second reversible deletion for individual and selected tasks
   (#47).
+- Windows: the shared app accelerators now work window-wide — Ctrl+1…4
+  switch smart views, Ctrl+N focuses quick add, Ctrl+F focuses search,
+  Ctrl+Shift+C toggles completed tasks, and Ctrl+Shift+N / Ctrl+O create
+  or open a database.
 - Linux: the About dialog now carries the same website and Report-an-Issue
   links as macOS and Windows (GtkAboutDialog cannot hold a second link,
   so the dialog is built on the plain family layout); Windows and Linux
diff --git a/README.md b/README.md
index 41e29cb..380b844 100644
--- a/README.md
+++ b/README.md
@@ -38,8 +38,8 @@ watch architecture.
   actions and a one-step undo banner for deletes; ↑/↓ navigation,
   Return expands the row in place (title, date/time chips, notes),
   Esc collapses; completed tasks fold under a collapsible header.
-  Complete on macOS today; Linux ships the undo banner and the
-  keyboard flow, Windows is catching up
+  The full set — including the shared app accelerators (Ctrl/⌘+1…4,
+  N, F, ⇧C) — ships on all three platforms
   ([status](docs/UX-BENCHMARKS.md)).
 - **Due-task notifications** — a 60 s poll plus a startup check, deduped,
   capped at three separate banners (more → one summary).
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 185f4d3..b886fb1 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -20,7 +20,7 @@ Taskly 构建在 [Rivet](https://github.com/turinglambdaai/rivet) 之上：全
 
 - **Reminders 风格界面**——智能视图（今天 / 计划 / 全部 / 已完成），emoji 图标 + 12 色板的自定义清单，明暗主题跟随系统，中英双语实时切换。
 - **自然语言快速添加**——输入 `明天买菜` 或 `standup @9am +1d`，回车前就能在实时预览 chip 里看到解析出的排程。
-- **对齐 Reminders 的交互**——⌘/⇧ 多选、批量操作、删除一键撤销横幅；↑/↓ 导航，Return 行内展开（标题、日期/时间 chip、备注），Esc 收起；已完成任务收进可折叠分组。macOS 已全量对齐；Linux 已有撤销横幅与键盘流，Windows 正在补齐（[进度](docs/UX-BENCHMARKS.md)）。
+- **对齐 Reminders 的交互**——⌘/⇧ 多选、批量操作、删除一键撤销横幅；↑/↓ 导航，Return 行内展开（标题、日期/时间 chip、备注），Esc 收起；已完成任务收进可折叠分组。全套能力（含共享应用快捷键 Ctrl/⌘+1…4、N、F、⇧C）已在三平台齐装（[进度](docs/UX-BENCHMARKS.md)）。
 - **到期提醒通知**——60 秒轮询 + 启动检查，去重，超过三条合并为一条汇总。
 - **单文件数据**——所有任务存在一个 SQLite 文件（`~/.taskly/tasks.db`，WAL），丢进 iCloud/OneDrive/Dropbox 即可同步。格式文档化且稳定：[DATA-FORMAT](shared/spec/DATA-FORMAT.md)。
 - **面向 agent 的 CLI**——`taskly list|add|update|done|rm|search|mklist…`，`--json` 输出稳定、退出码固定、跨平台字节级一致（63 例 golden 套件钉死）。规格：[CLI-SPEC](shared/spec/CLI-SPEC.md)。
diff --git a/docs/UX-BENCHMARKS.md b/docs/UX-BENCHMARKS.md
index d7c888b..adc6bb1 100644
--- a/docs/UX-BENCHMARKS.md
+++ b/docs/UX-BENCHMARKS.md
@@ -31,13 +31,15 @@ Things 的灵魂是把"什么时候做"压进四个默认视图，用 **start da
 Things 几乎一切操作无需鼠标：全局快速录入、⌘N 新任务、⌘F 搜索、↑↓ 遍历、
 ⌘1…4 切视图、Enter 展开、Esc 收起。
 
-- ✅ 已落地（Linux 宿主）：Ctrl+1…4 切视图、Ctrl+N 聚焦快速添加、Ctrl+F 聚焦
-  搜索、Ctrl+Shift+C 切换显示已完成（PRODUCT-SPEC §8 的加速器全量接线）；
-  Esc 阶梯（编辑器 → 搜索 → 放行）。
+- ✅ 已落地（三平台）：Ctrl+1…4 切视图、Ctrl+N 聚焦快速添加、Ctrl+F 聚焦
+  搜索、Ctrl+Shift+C 切换显示已完成——Linux 宿主全量接线并带 Esc 阶梯
+  （编辑器 → 搜索 → 放行）；macOS 同一组命令走 ⌘ 系快捷键（⌘1…4/⌘N/
+  ⌘F/⇧⌘C）；Windows 用 KeyboardAccelerator 全窗口挂载同一契约，菜单上
+  另标 Ctrl+Shift+N / Ctrl+O 数据库快捷键提示。
 - ✅ Linux 任务列表：GTK 原生多选支持 Ctrl/Shift 点选和方向键焦点移动；
   Enter（或双击）激活选中行的行内编辑，Esc 先关闭编辑、再清除任务选择。
   任务列表轮询重建时按任务 ID 恢复选中状态。
-- 🔜 下一步：批量移动/完成/删除和跨视图选中策略仍须单独实现并实机验收。
+- ✅ 批量移动/完成/删除与跨视图选中策略已在三平台落地（详见 §2.4）。
 
 ### 1.3 "安静"的哲学（quiet software)
 
diff --git a/windows/MainWindow.xaml.cpp b/windows/MainWindow.xaml.cpp
index 43eae6c..91066eb 100644
--- a/windows/MainWindow.xaml.cpp
+++ b/windows/MainWindow.xaml.cpp
@@ -616,6 +616,7 @@ MainWindow::MainWindow() {
           window->OnEffectiveThemeChanged();
         }
       });
+  InstallAppAccelerators();
   InitializeBackendAsync();
 }
 
@@ -735,6 +736,11 @@ void MainWindow::ApplyLanguage() {
   MenuHelp().Title(t("menuHelp"));
   MenuNewDatabase().Text(t("menuNewDatabase"));
   MenuOpenDatabase().Text(t("menuOpenDatabase"));
+  // Hint-only: the actual accelerators are installed window-wide in
+  // InstallAppAccelerators (these two also have on-menu hints because
+  // the File menu rows exist to carry them).
+  MenuNewDatabase().KeyboardAcceleratorTextOverride(L"Ctrl+Shift+N");
+  MenuOpenDatabase().KeyboardAcceleratorTextOverride(L"Ctrl+O");
   MenuCloseDatabase().Text(t("menuCloseDatabase"));
   MenuExit().Text(t("menuExit"));
   MenuLangZh().Text(t("menuLangZh"));
@@ -2496,6 +2502,10 @@ void MainWindow::OnSmartTileClick(
   auto const tag = sender.as<mxc::Button>().Tag();
   auto const kind =
       static_cast<ViewKind>(winrt::unbox_value<std::int32_t>(tag));
+  SwitchSmartView(kind);
+}
+
+void MainWindow::SwitchSmartView(ViewKind kind) {
   if (view_ == kind) {
     return;
   }
@@ -2509,6 +2519,69 @@ void MainWindow::OnSmartTileClick(
   ReloadTasksAsync();
 }
 
+// Ctrl+Shift+C mirrors the checkbox without double-firing its handler:
+// a programmatic IsChecked change raises Checked/Unchecked in WinUI, so
+// the handler applies the state first and this only finishes the job if
+// the event never ran.
+void MainWindow::ToggleShowCompleted() {
+  auto const boxed = ShowCompletedCheck().IsChecked();
+  bool const on = !(boxed != nullptr && boxed.Value());
+  ShowCompletedCheck().IsChecked(on);
+  if (show_completed_ == on) return;
+  show_completed_ = on;
+  ReloadTasksAsync();
+}
+
+// PRODUCT-SPEC §8: the accelerators work window-wide without opening the
+// menu. KeyboardAccelerators are scoped to the attached element's
+// XamlRoot, so RootGrid covers the whole window; each accelerator calls
+// the same code path its on-screen control uses.
+void MainWindow::InstallAppAccelerators() {
+  using winrt::Microsoft::UI::Xaml::Input::KeyboardAccelerator;
+  using winrt::Windows::System::VirtualKey;
+  auto const control = winrt::Windows::System::VirtualKeyModifiers::Control;
+  auto const control_shift =
+      control | winrt::Windows::System::VirtualKeyModifiers::Shift;
+  auto attach = [&](VirtualKey key,
+                    winrt::Windows::System::VirtualKeyModifiers mods,
+                    auto&& invoked) {
+    KeyboardAccelerator acc{};
+    acc.Modifiers(mods);
+    acc.Key(key);
+    acc.Invoked([invoked](auto const&,
+                          winrt::Microsoft::UI::Xaml::Input::
+                              KeyboardAcceleratorInvokedEventArgs const&
+                                  args) {
+      args.Handled(true);
+      invoked();
+    });
+    RootGrid().KeyboardAccelerators().Append(acc);
+  };
+  attach(VirtualKey::Number1, control,
+         [this] { SwitchSmartView(ViewKind::Today); });
+  attach(VirtualKey::Number2, control,
+         [this] { SwitchSmartView(ViewKind::Planned); });
+  attach(VirtualKey::Number3, control,
+         [this] { SwitchSmartView(ViewKind::All); });
+  attach(VirtualKey::Number4, control,
+         [this] { SwitchSmartView(ViewKind::Completed); });
+  attach(VirtualKey::N, control, [this] {
+    if (inline_task_id_.has_value()) CommitInlineTaskEditor();
+    NewTaskBox().Focus(winrt::Microsoft::UI::Xaml::FocusState::Keyboard);
+  });
+  attach(VirtualKey::F, control,
+         [this] { SearchBox().Focus(winrt::Microsoft::UI::Xaml::FocusState::Keyboard); });
+  attach(VirtualKey::C, control_shift, [this] { ToggleShowCompleted(); });
+  attach(VirtualKey::N, control_shift, [this] {
+    Microsoft::UI::Xaml::RoutedEventArgs args;
+    OnNewDatabase(nullptr, args);
+  });
+  attach(VirtualKey::O, control, [this] {
+    Microsoft::UI::Xaml::RoutedEventArgs args;
+    OnOpenDatabase(nullptr, args);
+  });
+}
+
 void MainWindow::OnUserListSelectionChanged(
     winrt::Windows::Foundation::IInspectable const&,
     Microsoft::UI::Xaml::Controls::SelectionChangedEventArgs const&) {
diff --git a/windows/MainWindow.xaml.h b/windows/MainWindow.xaml.h
index 1557215..094d5c5 100644
--- a/windows/MainWindow.xaml.h
+++ b/windows/MainWindow.xaml.h
@@ -100,6 +100,14 @@ struct MainWindow : MainWindowT<MainWindow> {
 private:
   enum class ViewKind { Today, Planned, All, Completed, List };
 
+  // PRODUCT-SPEC §8 app accelerators (Ctrl+1…4 / Ctrl+N / Ctrl+F /
+  // Ctrl+Shift+C / Ctrl+Shift+N / Ctrl+O). They reuse the command paths
+  // of the tiles and menu items; Windows has no View menu, so the
+  // accelerators are installed on the root element in code.
+  void InstallAppAccelerators();
+  void SwitchSmartView(ViewKind kind);
+  void ToggleShowCompleted();
+
   static std::string ViewStringFor(ViewKind kind);
 
   winrt::fire_and_forget InitializeBackendAsync();