diff --git a/openless-all/app/src-tauri/Cargo.toml b/openless-all/app/src-tauri/Cargo.toml
index 584280b2..70d8533e 100644
--- a/openless-all/app/src-tauri/Cargo.toml
+++ b/openless-all/app/src-tauri/Cargo.toml
@@ -96,6 +96,7 @@ windows = { version = "0.58", features = [
   "Win32_System_Ole",
   "Win32_System_Registry",
   "Win32_System_Threading",
+  "Win32_UI_HiDpi",
   "Win32_UI_Input_KeyboardAndMouse",
   "Win32_UI_Shell",
   "Win32_UI_TextServices",
diff --git a/openless-all/app/src-tauri/src/coordinator.rs b/openless-all/app/src-tauri/src/coordinator.rs
index 12ce3cf0..26e5987b 100644
--- a/openless-all/app/src-tauri/src/coordinator.rs
+++ b/openless-all/app/src-tauri/src/coordinator.rs
@@ -5098,21 +5098,52 @@ struct CapsuleLayoutState {
     scale_bits: u64,
 }
 
-fn maybe_position_capsule_bottom_center<R: tauri::Runtime>(
-    inner: &Arc<Inner>,
+/// 返回胶囊「应该摆放到的显示器」的标识信息。
+///
+/// 它看的显示器必须和 `position_capsule_bottom_center` 实际定位用的一致：
+/// Windows 看「正在输入的 App 所在显示器」，其它平台看胶囊自己的显示器。
+/// 这是「是否需要重新定位」去重缓存（`maybe_position_capsule_bottom_center`）
+/// 的 key，如果这里看错了显示器，就会出现「输入焦点移到另一块屏、胶囊却没
+/// 跟过去」的 bug。
+fn capsule_layout_snapshot<R: tauri::Runtime>(
     window: &tauri::WebviewWindow<R>,
     translation_active: bool,
-) {
-    let Some(monitor) = window.current_monitor().ok().flatten() else {
-        return;
-    };
-    let next = CapsuleLayoutState {
+) -> Option<CapsuleLayoutState> {
+    // Windows：以「正在输入的 App 所在显示器」为基准。若用胶囊自己的
+    // current_monitor，输入焦点切到另一块屏时胶囊仍在原屏 → 误判「没变化」
+    // → 跳过重新定位。
+    #[cfg(target_os = "windows")]
+    {
+        if let Some(mon) = crate::foreground_window_monitor() {
+            return Some(CapsuleLayoutState {
+                translation_active,
+                monitor_x: mon.left,
+                monitor_y: mon.top,
+                monitor_width: (mon.right - mon.left).max(0) as u32,
+                monitor_height: (mon.bottom - mon.top).max(0) as u32,
+                scale_bits: mon.scale.to_bits(),
+            });
+        }
+        // 仅当 Win32 取不到前台显示器时，落回下面的 current_monitor。
+    }
+    let monitor = window.current_monitor().ok().flatten()?;
+    Some(CapsuleLayoutState {
         translation_active,
         monitor_x: monitor.position().x,
         monitor_y: monitor.position().y,
         monitor_width: monitor.size().width,
         monitor_height: monitor.size().height,
         scale_bits: monitor.scale_factor().to_bits(),
+    })
+}
+
+fn maybe_position_capsule_bottom_center<R: tauri::Runtime>(
+    inner: &Arc<Inner>,
+    window: &tauri::WebviewWindow<R>,
+    translation_active: bool,
+) {
+    let Some(next) = capsule_layout_snapshot(window, translation_active) else {
+        return;
     };
     {
         let last = inner.capsule_layout.lock();
diff --git a/openless-all/app/src-tauri/src/lib.rs b/openless-all/app/src-tauri/src/lib.rs
index 8b808a61..4b75e11e 100644
--- a/openless-all/app/src-tauri/src/lib.rs
+++ b/openless-all/app/src-tauri/src/lib.rs
@@ -55,7 +55,10 @@ use tauri::menu::{
     CheckMenuItemBuilder, Menu, MenuBuilder, MenuItemBuilder, Submenu, SubmenuBuilder,
 };
 use tauri::tray::{MouseButton, TrayIconBuilder, TrayIconEvent};
-use tauri::{AppHandle, Emitter, LogicalPosition, LogicalSize, Manager, RunEvent, Runtime};
+use tauri::{
+    AppHandle, Emitter, LogicalPosition, LogicalSize, Manager, PhysicalPosition, PhysicalSize,
+    RunEvent, Runtime,
+};
 
 use crate::types::PolishMode;
 
@@ -1256,17 +1259,89 @@ fn show_qa_window_no_activate<R: tauri::Runtime>(window: &tauri::WebviewWindow<R
     true
 }
 
+/// 输入目标显示器的物理矩形（虚拟桌面坐标）+ DPI 缩放。
+#[cfg(target_os = "windows")]
+pub(crate) struct ForegroundMonitor {
+    pub(crate) left: i32,
+    pub(crate) top: i32,
+    pub(crate) right: i32,
+    pub(crate) bottom: i32,
+    /// 该显示器的有效 DPI 缩放（1.0 = 96dpi）。
+    pub(crate) scale: f64,
+}
+
+/// 用 Win32 定位「当前前台窗口（= 用户正在输入的 App）」所在的显示器。
+/// 多显示器下用它把胶囊摆到「正在输入的那块屏」。`window.current_monitor()`
+/// 返回的是胶囊窗口自己所在的显示器，因此不能用它来跟随输入位置。
+#[cfg(target_os = "windows")]
+pub(crate) fn foreground_window_monitor() -> Option<ForegroundMonitor> {
+    use windows::Win32::Graphics::Gdi::{
+        GetMonitorInfoW, MonitorFromWindow, MONITORINFO, MONITOR_DEFAULTTONEAREST,
+    };
+    use windows::Win32::UI::HiDpi::{GetDpiForMonitor, MDT_EFFECTIVE_DPI};
+    use windows::Win32::UI::WindowsAndMessaging::GetForegroundWindow;
+
+    unsafe {
+        let hwnd = GetForegroundWindow();
+        let hmon = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
+        if hmon.is_invalid() {
+            return None;
+        }
+        let mut mi = MONITORINFO {
+            cbSize: std::mem::size_of::<MONITORINFO>() as u32,
+            ..Default::default()
+        };
+        if !GetMonitorInfoW(hmon, &mut mi).as_bool() {
+            return None;
+        }
+        let mut dpi_x: u32 = 96;
+        let mut dpi_y: u32 = 96;
+        // 取不到时退回 96dpi 继续，不让定位整体失败。
+        let _ = GetDpiForMonitor(hmon, MDT_EFFECTIVE_DPI, &mut dpi_x, &mut dpi_y);
+        Some(ForegroundMonitor {
+            left: mi.rcMonitor.left,
+            top: mi.rcMonitor.top,
+            right: mi.rcMonitor.right,
+            bottom: mi.rcMonitor.bottom,
+            scale: (dpi_x as f64 / 96.0).max(0.1),
+        })
+    }
+}
+
 /// 把 capsule 窗口移到屏幕底部居中，与 Swift `CapsuleWindowController.repositionToBottomCenter` 同效。
 /// 留 80pt 给 macOS Dock；Windows 任务栏一般在底部 48pt 以内，整体也合适。
 pub(crate) fn position_capsule_bottom_center<R: tauri::Runtime>(
     window: &tauri::WebviewWindow<R>,
     translation_active: bool,
 ) -> tauri::Result<()> {
+    let bounds = capsule_window_bounds(translation_active);
+
+    // Windows：跟随「正在输入的 App」所在显示器摆放，避免多显示器下胶囊
+    // 总是固定出现在主屏 / 胶囊自己那块屏。
+    #[cfg(target_os = "windows")]
+    {
+        if let Some(mon) = foreground_window_monitor() {
+            let scale = mon.scale;
+            let phys_w = (bounds.width * scale).round() as i32;
+            let phys_h = (bounds.height * scale).round() as i32;
+            window.set_size(PhysicalSize::new(phys_w.max(1) as u32, phys_h.max(1) as u32))?;
+
+            let mon_w = mon.right - mon.left;
+            let x = mon.left + ((mon_w - phys_w) / 2).max(0);
+            // 与既有行为一致：「距底部 visual高度 + 80 + inset」，按 physical px 计算。
+            let offset_from_bottom =
+                (capsule_visual_height(translation_active) + 80.0 + bounds.bottom_inset) * scale;
+            let y = ((mon.bottom as f64) - offset_from_bottom).round() as i32;
+            window.set_position(PhysicalPosition::new(x, y.max(mon.top)))?;
+            return Ok(());
+        }
+        // 仅当 Win32 取不到前台显示器时，落回下面的 current_monitor 逻辑。
+    }
+
     let monitor = match window.current_monitor()? {
         Some(m) => m,
         None => return Ok(()),
     };
-    let bounds = capsule_window_bounds(translation_active);
     window.set_size(LogicalSize::new(bounds.width, bounds.height))?;
 
     let scale = monitor.scale_factor();