diff --git a/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs b/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs
index a887c87..9911a90 100644
--- a/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs
+++ b/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs
@@ -369,6 +369,11 @@ public sealed unsafe class IndoorCellStencilPipeline : IDisposable
         _gl.StencilFunc(StencilFunction.Equal, 0x02, 0x02u); // bit 2 set
         _gl.StencilMask(0x00u);                              // read-only — do not touch bit 1 or bit 2
         _gl.StencilOp(StencilOp.Keep, StencilOp.Keep, StencilOp.Keep);
+        // Make the per-cell transparent render state explicit (don't inherit DrawRegionBit2's
+        // DepthFunc.Always): depth-test Less, depth-write off (translucent). Self-describing so
+        // the clip pass can't silently regress if a sibling helper's exit state changes.
+        _gl.DepthFunc(DepthFunction.Less);
+        _gl.DepthMask(false);
     }
 
     // Triangulate the NDC region (fan, z=0) and draw it writing only bit 2 (set or clear).
@@ -415,7 +420,10 @@ public sealed unsafe class IndoorCellStencilPipeline : IDisposable
         _gl.DrawArrays(PrimitiveType.Triangles, 0, (uint)triVerts);
         _gl.BindVertexArray(0);
         _gl.Enable(EnableCap.CullFace);
-        _gl.ColorMask(true, true, true, true);
+        _gl.ColorMask(true, true, true, false); // match the indoor pass convention (alpha-write off)
+        // Restore the loop's depth-test: do NOT leak DepthFunc.Always into the cell render, the
+        // unclipped else-branch, the IndoorPass shells, or Step 4. (Opus review C1/C2.)
+        _gl.DepthFunc(DepthFunction.Less);
     }
 
     /// <summary>