diff --git a/black_screen_dim.py b/black_screen_dim.py
index 6cc09b5..d6f6e9f 100644
--- a/black_screen_dim.py
+++ b/black_screen_dim.py
@@ -104,11 +104,18 @@ if sys.platform == "win32":
     TRANSPARENT = 1
     DEFAULT_GUI_FONT = 17
 
-    WNDPROC = ctypes.WINFUNCTYPE(wt.LRESULT, wt.HWND, wt.UINT, wt.WPARAM, wt.LPARAM)
+    LRESULT = ctypes.c_int64
+    HMONITOR = ctypes.c_void_p
+    HHOOK = ctypes.c_void_p
+    HCURSOR = ctypes.c_void_p
+    ULONG_PTR = ctypes.c_void_p
+    UINT_PTR = ctypes.c_void_p
+
+    WNDPROC = ctypes.WINFUNCTYPE(LRESULT, wt.HWND, wt.UINT, wt.WPARAM, wt.LPARAM)
     MONITORENUMPROC = ctypes.WINFUNCTYPE(
-        wt.BOOL, wt.HMONITOR, wt.HDC, ctypes.POINTER(wt.RECT), wt.LPARAM
+        wt.BOOL, HMONITOR, wt.HDC, ctypes.POINTER(wt.RECT), wt.LPARAM
     )
-    HOOKPROC = ctypes.WINFUNCTYPE(wt.LRESULT, ctypes.c_int, wt.WPARAM, wt.LPARAM)
+    HOOKPROC = ctypes.WINFUNCTYPE(LRESULT, ctypes.c_int, wt.WPARAM, wt.LPARAM)
 
     class WNDCLASSEXW(ctypes.Structure):
         _fields_ = [
@@ -119,7 +126,7 @@ if sys.platform == "win32":
             ("cbWndExtra", wt.INT),
             ("hInstance", wt.HINSTANCE),
             ("hIcon", wt.HICON),
-            ("hCursor", wt.HCURSOR),
+            ("hCursor", HCURSOR),
             ("hbrBackground", wt.HBRUSH),
             ("lpszMenuName", wt.LPCWSTR),
             ("lpszClassName", wt.LPCWSTR),
@@ -142,7 +149,7 @@ if sys.platform == "win32":
             ("scanCode", wt.DWORD),
             ("flags", wt.DWORD),
             ("time", wt.DWORD),
-            ("dwExtraInfo", wt.ULONG_PTR),
+            ("dwExtraInfo", ULONG_PTR),
         ]
 
     # --- prototypes (64-bit safe) ---
@@ -161,9 +168,9 @@ if sys.platform == "win32":
     user32.UpdateWindow.restype = wt.BOOL
     user32.SetWindowPos.argtypes = [wt.HWND, wt.HWND, wt.INT, wt.INT, wt.INT, wt.INT, wt.UINT]
     user32.SetWindowPos.restype = wt.BOOL
-    user32.SetTimer.argtypes = [wt.HWND, wt.UINT_PTR, wt.UINT, ctypes.c_void_p]
-    user32.SetTimer.restype = wt.UINT_PTR
-    user32.KillTimer.argtypes = [wt.HWND, wt.UINT_PTR]
+    user32.SetTimer.argtypes = [wt.HWND, UINT_PTR, wt.UINT, ctypes.c_void_p]
+    user32.SetTimer.restype = UINT_PTR
+    user32.KillTimer.argtypes = [wt.HWND, UINT_PTR]
     user32.KillTimer.restype = wt.BOOL
     user32.GetClientRect.argtypes = [wt.HWND, ctypes.POINTER(wt.RECT)]
     user32.GetClientRect.restype = wt.BOOL
@@ -182,24 +189,20 @@ if sys.platform == "win32":
     user32.DispatchMessageW.argtypes = [ctypes.POINTER(wt.MSG)]
     user32.DispatchMessageW.restype = wt.LONG
     user32.SetWindowsHookExW.argtypes = [wt.INT, HOOKPROC, wt.HINSTANCE, wt.DWORD]
-    user32.SetWindowsHookExW.restype = wt.HHOOK
-    user32.CallNextHookEx.argtypes = [wt.HHOOK, ctypes.c_int, wt.WPARAM, wt.LPARAM]
-    user32.CallNextHookEx.restype = wt.LRESULT
-    user32.UnhookWindowsHookEx.argtypes = [wt.HHOOK]
+    user32.SetWindowsHookExW.restype = HHOOK
+    user32.CallNextHookEx.argtypes = [HHOOK, ctypes.c_int, wt.WPARAM, wt.LPARAM]
+    user32.CallNextHookEx.restype = LRESULT
+    user32.UnhookWindowsHookEx.argtypes = [HHOOK]
     user32.UnhookWindowsHookEx.restype = wt.BOOL
     user32.DestroyWindow.argtypes = [wt.HWND]
     user32.DestroyWindow.restype = wt.BOOL
     user32.ShowCursor.argtypes = [wt.BOOL]
     user32.ShowCursor.restype = wt.INT
     user32.DefWindowProcW.argtypes = [wt.HWND, wt.UINT, wt.WPARAM, wt.LPARAM]
-    user32.DefWindowProcW.restype = wt.LRESULT
+    user32.DefWindowProcW.restype = LRESULT
     user32.SetProcessDPIAware.argtypes = []
     user32.SetProcessDPIAware.restype = wt.BOOL
     gdi32.CreateSolidBrush.argtypes = [wt.COLORREF]
-    gdi32.CreateSolidBrush.restype = wt.HBRUSH
-    gdi32.FillRect.argtypes = [wt.HDC, ctypes.POINTER(wt.RECT), wt.HBRUSH]
-    gdi32.FillRect.restype = wt.INT
-    gdi32.DeleteObject.argtypes = [wt.HGDIOBJ]
     gdi32.DeleteObject.restype = wt.BOOL
     gdi32.SetTextColor.argtypes = [wt.HDC, wt.COLORREF]
     gdi32.SetTextColor.restype = wt.COLORREF
@@ -209,8 +212,8 @@ if sys.platform == "win32":
     gdi32.GetStockObject.restype = wt.HGDIOBJ
     gdi32.SelectObject.argtypes = [wt.HDC, wt.HGDIOBJ]
     gdi32.SelectObject.restype = wt.HGDIOBJ
-    gdi32.DrawTextW.argtypes = [wt.HDC, wt.LPCWSTR, wt.INT, ctypes.POINTER(wt.RECT), wt.UINT]
-    gdi32.DrawTextW.restype = wt.INT
+    user32.DrawTextW.argtypes = [wt.HDC, wt.LPCWSTR, wt.INT, ctypes.POINTER(wt.RECT), wt.UINT]
+    user32.DrawTextW.restype = wt.INT
     kernel32.GetModuleHandleW.argtypes = [wt.LPCWSTR]
     kernel32.GetModuleHandleW.restype = wt.HINSTANCE
     kernel32.GetLastError.argtypes = []
@@ -229,28 +232,23 @@ if sys.platform == "win32":
             rects.append((r.left, r.top, r.right, r.bottom))
             return True
 
-        user32.EnumDisplayMonitors(0, 0, MONITORENUMPROC(cb), 0)
+        user32.EnumDisplayMonitors(None, None, MONITORENUMPROC(cb), 0)
         return rects
 
     def _wndproc(hwnd, msg, wparam, lparam):
-        if msg == WM_ERASEBKGND:
-            return 1
+        global _hint_active
         if msg == WM_PAINT:
+            # Background (black) is erased by DefWindowProc via the class brush.
             ps = PAINTSTRUCT()
             hdc = user32.BeginPaint(hwnd, ctypes.byref(ps))
-            rect = wt.RECT()
-            user32.GetClientRect(hwnd, ctypes.byref(rect))
-            brush = gdi32.CreateSolidBrush(0x000000)
-            gdi32.FillRect(hdc, ctypes.byref(rect), brush)
-            gdi32.DeleteObject(brush)
             if _hint_active:
                 gdi32.SetTextColor(hdc, 0xFFFFFF)
                 gdi32.SetBkMode(hdc, TRANSPARENT)
                 font = gdi32.GetStockObject(DEFAULT_GUI_FONT)
                 old = gdi32.SelectObject(hdc, font)
                 buf = ctypes.create_unicode_buffer(_hint_text)
-                gdi32.DrawTextW(
-                    hdc, buf, -1, ctypes.byref(rect),
+                user32.DrawTextW(
+                    hdc, buf, -1, ctypes.byref(ps.rcPaint),
                     DT_CENTER | DT_VCENTER | DT_SINGLELINE,
                 )
                 if old:
@@ -258,7 +256,6 @@ if sys.platform == "win32":
             user32.EndPaint(hwnd, ctypes.byref(ps))
             return 0
         if msg == WM_TIMER:
-            global _hint_active
             _hint_active = False
             user32.KillTimer(hwnd, 1)
             for h in _hwnds: