diff --git a/.phase34-state.json b/.phase34-state.json
index 95cb4c2..6be84f1 100644
--- a/.phase34-state.json
+++ b/.phase34-state.json
@@ -1,5 +1,8 @@
 {
   "completed_features": [],
-  "current_feature": "tabs-component",
-  "started_at": "2026-05-23T09:48:28.280761"
+  "current_feature": "accordion-component",
+  "started_at": "2026-05-23T09:48:28.280761",
+  "attempted_features": [
+    "tabs-component"
+  ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index 513c5fa..13bdd1d 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -3737,3 +3737,21 @@ src/index.ts(27,25): error TS2769: No overload matches this call.
   Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
     Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
       Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, 
+- `09:48:43` **INFO**   Committed feature tabs-component
+- `09:48:43` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: accordion-component (2026-05-23 09:48:43)
+
+- `09:48:43` **INFO** Description: Accordion mit collapsible Sections
+- `09:48:43` **INFO**   Generating apps/web/src/components/Accordion.tsx (Accordion-Component. Props: items (array {id, title, content: ReactNod…)
+- `09:48:58` **INFO**     wrote 1724 chars in 15.0s (attempt 1)
+- `09:48:58` **INFO** Running tsc --noEmit on api…
+- `09:49:00` **WARN**   tsc errors:
+src/db/schema.ts(37,14): error TS7022: 'customers' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.
+src/db/schema.ts(45,59): error TS7024: Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.
+src/db/schema.ts(49,14): error TS7022: 'projects' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.
+src/db/schema.ts(53,56): error TS7024: Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.
+src/index.ts(27,25): error TS2769: No overload matches this call.
+  Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, 
diff --git a/apps/web/src/components/Accordion.tsx b/apps/web/src/components/Accordion.tsx
new file mode 100644
index 0000000..e64f06b
--- /dev/null
+++ b/apps/web/src/components/Accordion.tsx
@@ -0,0 +1,61 @@
+import React, { useState } from 'react';
+import { ChevronDown } from 'lucide-react';
+
+interface AccordionItem {
+  id: string;
+  title: string;
+  content: React.ReactNode;
+}
+
+interface AccordionProps {
+  items: AccordionItem[];
+  allowMultiple?: boolean;
+}
+
+export default function Accordion({ items, allowMultiple = false }: AccordionProps) {
+  const [openIds, setOpenIds] = useState<Set<string>>(new Set());
+
+  const toggleItem = (id: string) => {
+    setOpenIds((prev) => {
+      const next = new Set(prev);
+      if (next.has(id)) {
+        next.delete(id);
+      } else {
+        if (!allowMultiple) {
+          next.clear();
+        }
+        next.add(id);
+      }
+      return next;
+    });
+  };
+
+  return (
+    <div className="flex flex-col gap-2 w-full">
+      {items.map((item) => {
+        const isOpen = openIds.has(item.id);
+        return (
+          <div 
+            key={item.id} 
+            className="border border-slate-200 dark:border-slate-800 rounded-lg overflow-hidden"
+          >
+            <button
+              onClick={() => toggleItem(item.id)}
+              className="flex items-center justify-between w-full p-4 text-left font-medium transition-colors hover:bg-slate-50 dark:hover:bg-slate-900"
+            >
+              <span>{item.title}</span>
+              <ChevronDown 
+                className={`w-5 h-5 transition-transform duration-200 ${isOpen ? 'rotate-180' : ''}`} 
+              />
+            </button>
+            {isOpen && (
+              <div className="p-4 pt-0 border-t border-slate-100 dark:border-slate-800 text-slate-600 dark:text-slate-400">
+                {item.content}
+              </div>
+            )}
+          </div>
+        );
+      })}
+    </div>
+  );
+}
\ No newline at end of file