diff --git a/openless-all/app/src-tauri/Cargo.toml b/openless-all/app/src-tauri/Cargo.toml
index 6a69b47a..0a8484df 100644
--- a/openless-all/app/src-tauri/Cargo.toml
+++ b/openless-all/app/src-tauri/Cargo.toml
@@ -53,8 +53,11 @@ objc2-foundation = "0.2"
 objc2-app-kit = "0.2"
 
 [target.'cfg(target_os = "windows")'.dependencies]
+raw-window-handle = "0.6"
 windows = { version = "0.58", features = [
   "Win32_Foundation",
+  "Win32_Graphics_Dwm",
+  "Win32_Graphics_Gdi",
   "Win32_UI_Shell",
   "Win32_UI_Input_KeyboardAndMouse",
   "Win32_UI_WindowsAndMessaging",
diff --git a/openless-all/app/src-tauri/src/lib.rs b/openless-all/app/src-tauri/src/lib.rs
index 94684d77..b5454aac 100644
--- a/openless-all/app/src-tauri/src/lib.rs
+++ b/openless-all/app/src-tauri/src/lib.rs
@@ -113,6 +113,7 @@ pub fn run() {
                     if let Err(e) = apply_mica(&main, None) {
                         log::warn!("[main] mica failed: {e}");
                     }
+                    apply_windows_rounded_frame(&main);
                 }
                 if let Err(e) = main.show() {
                     log::warn!("[main] initial show failed: {e}");
@@ -219,10 +220,16 @@ pub fn run() {
             RunEvent::Reopen { .. } => show_main_window(app),
             RunEvent::WindowEvent { label, event, .. } => {
                 if label == "main" {
-                    if let tauri::WindowEvent::CloseRequested { api, .. } = event {
+                    if let tauri::WindowEvent::CloseRequested { ref api, .. } = event {
                         api.prevent_close();
                         hide_main_window(app);
                     }
+                    #[cfg(target_os = "windows")]
+                    if matches!(event, tauri::WindowEvent::Resized(_) | tauri::WindowEvent::ScaleFactorChanged { .. }) {
+                        if let Some(main) = app.get_webview_window("main") {
+                            apply_windows_rounded_frame(&main);
+                        }
+                    }
                 }
             }
             RunEvent::Exit => {
@@ -234,6 +241,97 @@ pub fn run() {
         });
 }
 
+#[cfg(target_os = "windows")]
+fn apply_windows_rounded_frame<R: Runtime>(window: &tauri::WebviewWindow<R>) {
+    use raw_window_handle::{HasWindowHandle, RawWindowHandle};
+    use windows::Win32::Foundation::{BOOL, HWND, RECT};
+    use windows::Win32::Graphics::Dwm::{
+        DwmSetWindowAttribute, DWMWA_BORDER_COLOR, DWMWA_WINDOW_CORNER_PREFERENCE, DWMWCP_ROUND,
+    };
+    use windows::Win32::Graphics::Gdi::{CreateRoundRectRgn, SetWindowRgn, HRGN};
+    use windows::Win32::UI::WindowsAndMessaging::{
+        GetWindowLongW, GetWindowRect, SetWindowLongW, SetWindowPos, GWL_STYLE, SWP_FRAMECHANGED,
+        SWP_NOMOVE, SWP_NOSIZE, SWP_NOZORDER, WS_CAPTION, WS_THICKFRAME,
+    };
+
+    let handle = match window.window_handle().map(|h| h.as_raw()) {
+        Ok(RawWindowHandle::Win32(handle)) => handle,
+        Ok(other) => {
+            log::warn!("[main] unexpected raw window handle for DWM frame: {other:?}");
+            return;
+        }
+        Err(e) => {
+            log::warn!("[main] read raw window handle failed: {e}");
+            return;
+        }
+    };
+    let hwnd = HWND(handle.hwnd.get() as *mut core::ffi::c_void);
+
+    unsafe {
+        let style = GetWindowLongW(hwnd, GWL_STYLE);
+        let native_frame_bits = (WS_CAPTION.0 | WS_THICKFRAME.0) as i32;
+        if style & native_frame_bits != 0 {
+            SetWindowLongW(hwnd, GWL_STYLE, style & !native_frame_bits);
+            if let Err(e) = SetWindowPos(
+                hwnd,
+                HWND::default(),
+                0,
+                0,
+                0,
+                0,
+                SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED,
+            ) {
+                log::warn!("[main] refresh native frame after style update failed: {e}");
+            }
+        }
+
+        if window.is_maximized().unwrap_or(false) {
+            let _ = SetWindowRgn(hwnd, HRGN::default(), BOOL(1));
+            return;
+        }
+
+        let corner_preference = DWMWCP_ROUND;
+        if let Err(e) = DwmSetWindowAttribute(
+            hwnd,
+            DWMWA_WINDOW_CORNER_PREFERENCE,
+            &corner_preference as *const _ as *const core::ffi::c_void,
+            std::mem::size_of_val(&corner_preference) as u32,
+        ) {
+            log::warn!("[main] set DWM rounded corners failed: {e}");
+        }
+
+        // Remove DWM's fallback 1px light border; the React shell draws the visual stroke.
+        let border_color_none: u32 = 0xFFFFFFFE;
+        if let Err(e) = DwmSetWindowAttribute(
+            hwnd,
+            DWMWA_BORDER_COLOR,
+            &border_color_none as *const _ as *const core::ffi::c_void,
+            std::mem::size_of_val(&border_color_none) as u32,
+        ) {
+            log::warn!("[main] remove DWM border color failed: {e}");
+        }
+
+        let mut rect = RECT::default();
+        if let Err(e) = GetWindowRect(hwnd, &mut rect) {
+            log::warn!("[main] read window rect for rounded region failed: {e}");
+            return;
+        }
+        let width = rect.right - rect.left;
+        let height = rect.bottom - rect.top;
+        if width <= 0 || height <= 0 {
+            return;
+        }
+        let region = CreateRoundRectRgn(0, 0, width + 1, height + 1, 18, 18);
+        if region.is_invalid() {
+            log::warn!("[main] create rounded window region failed");
+            return;
+        }
+        if SetWindowRgn(hwnd, region, BOOL(1)) == 0 {
+            log::warn!("[main] apply rounded window region failed");
+        }
+    }
+}
+
 #[tauri::command]
 fn restart_app(app: AppHandle) {
     // macOS：自动更新会让新装的 .app 带 com.apple.quarantine（无论 Tauri updater
diff --git a/openless-all/app/src/components/FloatingShell.tsx b/openless-all/app/src/components/FloatingShell.tsx
index 3f93aa6c..08ab4932 100644
--- a/openless-all/app/src/components/FloatingShell.tsx
+++ b/openless-all/app/src/components/FloatingShell.tsx
@@ -255,7 +255,7 @@ function FloatingShellBody({ os, initialTab, initialSettings }: { os: OS; initia
               flex: 1, minWidth: 0,
               overflow: 'hidden',
               background: 'var(--ol-surface)',
-              borderRadius: os === 'mac' ? 20 : 14,
+              borderRadius: os === 'mac' ? 20 : 10,
               border: '0.5px solid rgba(0,0,0,0.06)',
               boxShadow: '0 1px 0 rgba(255,255,255,0.8) inset, 0 8px 24px -12px rgba(15,17,22,0.10), 0 2px 6px -2px rgba(15,17,22,0.06)',
               display: 'flex',
diff --git a/openless-all/app/src/components/WindowChrome.tsx b/openless-all/app/src/components/WindowChrome.tsx
index a572c5dc..81ff3b65 100644
--- a/openless-all/app/src/components/WindowChrome.tsx
+++ b/openless-all/app/src/components/WindowChrome.tsx
@@ -30,6 +30,8 @@ export function detectOS(): OS {
 
 const MAC_TITLEBAR_HEIGHT = 36;
 const MAC_SYSTEM_CONTROLS_RESERVED_WIDTH = 80;
+const MAC_WINDOW_RADIUS = 20;
+const WIN_WINDOW_RADIUS = 0;
 
 interface WindowChromeProps {
   os?: OS;
@@ -45,7 +47,7 @@ export function WindowChrome({ os = 'mac', title = 'OpenLess', children, height
         width: '100%',
         height,
         position: 'relative',
-        borderRadius: os === 'mac' ? 20 : 14,
+        borderRadius: os === 'mac' ? MAC_WINDOW_RADIUS : WIN_WINDOW_RADIUS,
         boxShadow: 'var(--ol-shadow-xl)',
         overflow: 'hidden',
         display: 'flex',
diff --git a/openless-all/app/src/styles/global.css b/openless-all/app/src/styles/global.css
index 8ab6a8d5..cda62844 100644
--- a/openless-all/app/src/styles/global.css
+++ b/openless-all/app/src/styles/global.css
@@ -3,17 +3,19 @@ html, body, #root {
   width: 100%;
   margin: 0;
   padding: 0;
+  background: transparent;
+  overflow: hidden;
 }
 
 body {
   background: transparent;
   user-select: none;
   -webkit-user-select: none;
-  overflow: hidden;
 }
 
 #root {
   display: flex;
+  isolation: isolate;
 }
 
 button {