Enhance styles for device categories in wiring.d2

Author: mariuste

Elektronik/Wiring_Plan/wiring.d2

@@ -25,15 +25,24 @@ classes: {
   # Geräte-Kategorien
   core_component: {
     shape: rectangle
-    style: { stroke: "#ff0000"; stroke-width: 4 } # Roter Rahmen
+    style: { 
+      stroke: "#ff0000"; stroke-width: 4
+      fill: "#fff2f2" # Sehr helles Rot
+    }
   }
   complex_device: {
     shape: rectangle
-    style: { stroke: "#0000ff"; stroke-width: 3 } # Blauer Rahmen
+    style: { 
+      stroke: "#0000ff"; stroke-width: 3
+      fill: "#f2f7ff" # Sehr helles Blau
+    }
   }
   end_device: {
     shape: rectangle
-    style: { stroke: "#000000"; stroke-width: 2 } # Schwarzer Rahmen
+    style: { 
+      stroke: "#000000"; stroke-width: 2
+      fill: "#ffffff" # Weißer Hintergrund
+    }
   }
 }