feat: Improve stone layer visibility and rendering

js/render.js

@@ -49,7 +49,21 @@ function render() {
                 const index = y * CHUNK_SIZE + x;
                 const type = chunk[index];
                 
-                if (type === EMPTY) continue;
+                // Always render stone layer even if it's not directly visible
+                if (type === EMPTY && chunkY !== 1) continue;
+                
+                // For the stone layer (chunkY = 1), render a faint background even for empty spaces
+                if (type === EMPTY && chunkY === 1) {
+                    // Use a very faint gray for empty spaces in the stone layer
+                    ctx.fillStyle = 'rgba(100, 100, 100, 0.2)';
+                    ctx.fillRect(
+                        screenX + x * PIXEL_SIZE,
+                        screenY + y * PIXEL_SIZE,
+                        PIXEL_SIZE,
+                        PIXEL_SIZE
+                    );
+                    continue;
+                }
                 
                 // Set color based on type
                 if (type === SAND) {