diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index a2832cc3..7f8063ff 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -2150,12 +2150,31 @@ public sealed class GameWindow : IDisposable
                     _dats!, 0x21000023u, ResolveChrome, vitalsDatFont);
             if (invLayout is not null)
             {
-                var inventoryWindow = invLayout.Root;
-                inventoryWindow.Visible = false;
-                inventoryWindow.Anchors = AcDream.App.UI.AnchorEdges.None;   // user-positioned
-                inventoryWindow.Draggable = true;
-                _uiHost.Root.AddChild(inventoryWindow);
-                _uiHost.RegisterWindow(AcDream.App.UI.WindowNames.Inventory, inventoryWindow);
+                var inventoryRoot = invLayout.Root;
+                // Wrap the dat content in the universal 8-piece beveled window chrome — the
+                // SAME UiNineSlicePanel the vitals/chat/toolbar windows use. The gmInventoryUI
+                // LayoutDesc (0x21000023) is 300×362; the frame adds one border thickness on
+                // every side. The frame is the draggable window; the dat content sits inside it.
+                const int invBorder = AcDream.App.UI.RetailChromeSprites.Border;
+                float invContentW = inventoryRoot.Width, invContentH = inventoryRoot.Height;
+                var inventoryFrame = new AcDream.App.UI.UiNineSlicePanel(ResolveChrome)
+                {
+                    Left = inventoryRoot.Left, Top = inventoryRoot.Top,   // keep the dat window position
+                    Width  = invContentW + 2 * invBorder,
+                    Height = invContentH + 2 * invBorder,
+                    Opacity = 1.0f,
+                    Visible = false,                                       // F12 toggles it
+                    Anchors = AcDream.App.UI.AnchorEdges.None,            // user-positioned
+                    Draggable = true,
+                };
+                // Content offset by the border so it sits inside the chrome.
+                inventoryRoot.Left = invBorder; inventoryRoot.Top = invBorder;
+                inventoryRoot.Width = invContentW; inventoryRoot.Height = invContentH;
+                inventoryRoot.Anchors = AcDream.App.UI.AnchorEdges.Left | AcDream.App.UI.AnchorEdges.Top;
+                inventoryRoot.Draggable = false;
+                inventoryFrame.AddChild(inventoryRoot);
+                _uiHost.Root.AddChild(inventoryFrame);
+                _uiHost.RegisterWindow(AcDream.App.UI.WindowNames.Inventory, inventoryFrame);
 
                 // Phase D.2b-B — populate the inventory from ClientObjectTable: the
                 // "Contents of Backpack" grid + the pack-selector strip + the burden meter +