add diffent lessions

classes/kriminalfälle.json

@@ -0,0 +1,18 @@
+{
+  "id": "kriminalfälle",
+  "name": "Kriminalfälle",
+  "icon": "🔍",
+  "description": "Löse echte Kriminalfälle aus Deutschland mit Mathematik",
+  "theme": {
+    "--theme-bg": "#1a252f",
+    "--theme-bg-mid": "#2c3e50",
+    "--theme-bg-light": "#34495e",
+    "--theme-bg-hover": "#3d566e",
+    "--theme-text": "#ecf0f1",
+    "--theme-muted": "#7f8c8d",
+    "--theme-muted-light": "#bdc3c7",
+    "--theme-accent": "#3498db",
+    "--theme-accent-hover": "#2980b9"
+  },
+  "lessons": ["steglitz", "bode-museum", "dresden-gruenes-gewoelbe"]
+}