added final frontend with full responsive style but without any logic

frontend/src/App.tsx

@@ -1,10 +1,49 @@
 import "./App.css";
+import Layout from "./layout/Layout";
+import { useEffect } from "react";
+import Form1 from "./components/Form1";
+import Form2 from "./components/Form2";
+import Form3 from "./components/Form3";
 
 function App() {
+  const Items = [
+    {
+      id: 1,
+      title: "Mock Book 1",
+      author: "Author 1",
+      description: "Description for Mock Book 1",
+    },
+    {
+      id: 2,
+      title: "Mock Book 2",
+      author: "Author 2",
+      description: "Description for Mock Book 2",
+    },
+    {
+      id: 3,
+      title: "Mock Book 3",
+      author: "Author 3",
+      description: "Description for Mock Book 3",
+    },
+  ];
+
+  useEffect(() => {
+    localStorage.setItem("allItems", JSON.stringify(Items));
+    localStorage.setItem("borrowableItems", JSON.stringify(Items));
+    localStorage.setItem("borrowCode", "123456");
+  }, []);
+
   return (
-    <>
-      <h1 className="text-3xl font-bold underline">Hello world!</h1>
-    </>
+    <Layout>
+      {/* Mock flow without real logic: show the three sections stacked for design preview */}
+      <div className="space-y-10">
+        <Form1 />
+        <div className="h-px bg-blue-100" />
+        <Form2 />
+        <div className="h-px bg-blue-100" />
+        <Form3 />
+      </div>
+    </Layout>
   );
 }
 

frontend/src/components/Form1.tsx

@@ -0,0 +1,45 @@
+import React from "react";
+
+const Form1: React.FC = () => {
+  return (
+    <div className="space-y-6">
+      <h2 className="text-xl font-bold text-blue-700">1. Zeitraum wählen</h2>
+      <form className="space-y-4">
+        <div>
+          <label
+            htmlFor="startDate"
+            className="block text-sm font-medium text-blue-800 mb-1"
+          >
+            Start
+          </label>
+          <input
+            type="datetime-local"
+            id="startDate"
+            className="w-full border border-blue-200 rounded-lg px-3 py-2 focus:ring-2 focus:ring-blue-400 focus:outline-none bg-white/70"
+          />
+        </div>
+        <div>
+          <label
+            htmlFor="endDate"
+            className="block text-sm font-medium text-blue-800 mb-1"
+          >
+            Ende
+          </label>
+          <input
+            type="datetime-local"
+            id="endDate"
+            className="w-full border border-blue-200 rounded-lg px-3 py-2 focus:ring-2 focus:ring-blue-400 focus:outline-none bg-white/70"
+          />
+        </div>
+        <button
+          type="submit"
+          className="w-full bg-gradient-to-r from-blue-600 to-blue-400 hover:from-blue-700 hover:to-blue-500 text-white font-bold py-2 px-4 rounded-xl shadow transition"
+        >
+          Verfügbare Gegenstände anzeigen
+        </button>
+      </form>
+    </div>
+  );
+};
+
+export default Form1;

frontend/src/components/Form2.tsx

@@ -0,0 +1,61 @@
+import React from "react";
+
+const Form2: React.FC = () => {
+  const items = JSON.parse(localStorage.getItem("borrowableItems") || "[]");
+  return (
+    <div className="space-y-6">
+      <h2 className="text-xl font-bold text-blue-700">
+        2. Gegenstand auswählen
+      </h2>
+      <form className="space-y-4">
+        {items.length === 0 ? (
+          <div className="text-red-600 font-medium text-center bg-red-50 border border-red-200 rounded-xl p-4">
+            Keine Gegenstände verfügbar für diesen Zeitraum.
+          </div>
+        ) : (
+          <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
+            {items.map((item: any) => (
+              <label
+                key={item.id}
+                htmlFor={String(item.id)}
+                className="group cursor-pointer bg-white/80 rounded-xl p-4 shadow hover:shadow-md transition border border-blue-100 flex items-start gap-3"
+              >
+                <input
+                  type="checkbox"
+                  name={String(item.id)}
+                  id={String(item.id)}
+                  className="mt-1 h-4 w-4 rounded border-blue-300 text-blue-600 focus:ring-blue-400"
+                />
+                <div>
+                  <h3 className="text-sm font-semibold text-blue-800">
+                    {item.title}
+                  </h3>
+                  <p className="text-xs text-blue-500/80 line-clamp-2">
+                    {item.description}
+                  </p>
+                </div>
+              </label>
+            ))}
+          </div>
+        )}
+
+        <div className="flex flex-col sm:flex-row gap-3 pt-2">
+          <button
+            type="button"
+            className="flex-1 sm:flex-none sm:w-36 bg-white text-blue-700 border border-blue-200 hover:bg-blue-50 font-medium py-2 px-4 rounded-xl shadow-sm transition"
+          >
+            Zurück
+          </button>
+          <button
+            type="submit"
+            className="flex-1 sm:flex-none sm:w-40 bg-gradient-to-r from-blue-600 to-blue-400 hover:from-blue-700 hover:to-blue-500 text-white font-bold py-2 px-4 rounded-xl shadow transition"
+          >
+            Ausleihen
+          </button>
+        </div>
+      </form>
+    </div>
+  );
+};
+
+export default Form2;

frontend/src/components/Form3.tsx

@@ -0,0 +1,29 @@
+import React from "react";
+import { myToast } from "../utils/toastify";
+
+const Form3: React.FC = () => {
+  if (localStorage.getItem("borrowCode")) {
+    myToast("Ausleihe erfolgreich!", "success");
+  } else {
+    myToast("Ausleihe fehlgeschlagen!", "error");
+  }
+
+  const code = localStorage.getItem("borrowCode") ?? "—";
+
+  return (
+    <div className="space-y-4">
+      <h2 className="text-xl font-bold text-blue-700">3. Ausleihe bestätigt</h2>
+      <div className="mt-2 p-6 bg-blue-50/80 border border-blue-200 rounded-2xl text-center shadow-lg">
+        <p className="text-blue-800 font-semibold">Ihr Ausleihcode lautet</p>
+        <div className="text-3xl font-extrabold tracking-widest text-blue-700 mt-1">
+          {code}
+        </div>
+        <p className="text-blue-600 mt-2 text-sm">
+          Bitte merken Sie sich diesen Code, um das Schließfach zu öffnen.
+        </p>
+      </div>
+    </div>
+  );
+};
+
+export default Form3;

frontend/src/components/Header.tsx

@@ -2,8 +2,13 @@ import React from "react";
 
 const Header: React.FC = () => {
   return (
-    <header>
-      <h1>Header</h1>
+    <header className="mb-6 md:mb-10">
+      <h1 className="text-3xl md:text-4xl font-extrabold text-blue-800 tracking-tight drop-shadow-sm">
+        Gegenstand ausleihen
+      </h1>
+      <p className="text-blue-500 mt-1 md:mt-2 text-base md:text-lg font-medium">
+        Schnell und unkompliziert Equipment reservieren
+      </p>
     </header>
   );
 };

frontend/src/components/Object.tsx

@@ -0,0 +1,20 @@
+import React from "react";
+
+type ObjectProps = {
+  title: string;
+  description: string;
+};
+
+const Object: React.FC<ObjectProps> = ({ title, description }) => {
+  return (
+    <div className="flex items-start gap-3">
+      <div className="shrink-0 w-3 h-3 mt-1.5 rounded-full bg-green-400" />
+      <div>
+        <h3 className="text-sm font-semibold text-blue-800">{title}</h3>
+        <p className="text-xs text-blue-500/80 line-clamp-2">{description}</p>
+      </div>
+    </div>
+  );
+};
+
+export default Object;

frontend/src/components/Sidebar.tsx

@@ -0,0 +1,47 @@
+import React from "react";
+import Object from "./Object";
+
+const Sidebar: React.FC = () => {
+  const items = JSON.parse(localStorage.getItem("allItems") || "[]");
+
+  return (
+    <aside className="w-full md:w-80 md:min-h-screen bg-white/90 backdrop-blur md:border-r border-blue-100 shadow-xl flex flex-col p-6">
+      <h2 className="text-2xl font-extrabold mb-4 text-blue-700 tracking-tight flex items-center gap-2">
+        <svg
+          className="w-6 h-6 text-blue-500"
+          fill="none"
+          stroke="currentColor"
+          strokeWidth={2}
+          viewBox="0 0 24 24"
+        >
+          <path
+            strokeLinecap="round"
+            strokeLinejoin="round"
+            d="M16.5 7.5V4.75A2.25 2.25 0 0 0 14.25 2.5h-4.5A2.25 2.25 0 0 0 7.5 4.75V7.5m9 0h-9m9 0v11.75A2.25 2.25 0 0 1 14.25 21.5h-4.5A2.25 2.25 0 0 1 7.5 19.25V7.5m9 0h-9"
+          />
+        </svg>
+        Ausleih-Übersicht
+      </h2>
+
+      <div className="space-y-4 flex-1 overflow-auto pr-1">
+        {items.map((item: any) => (
+          <div
+            key={item.id}
+            className="bg-white/80 rounded-xl p-4 shadow hover:shadow-md transition"
+          >
+            <Object title={item.title} description={item.description} />
+          </div>
+        ))}
+      </div>
+
+      <div className="mt-6 text-xs text-gray-400 flex items-center gap-4">
+        <span className="inline-block w-3 h-3 bg-green-400 rounded-full"></span>
+        Verfügbar
+        <span className="inline-block w-3 h-3 bg-blue-400 rounded-full"></span>
+        Verliehen
+      </div>
+    </aside>
+  );
+};
+
+export default Sidebar;

frontend/src/layout/Layout.tsx

@@ -1,7 +1,8 @@
 import React from "react";
-import Header from "../components/Header";
 import "../App.css";
 import { ToastContainer } from "react-toastify";
+import Header from "../components/Header";
+import Sidebar from "../components/Sidebar";
 
 type LayoutProps = {
   children: React.ReactNode;
@@ -9,13 +10,32 @@ type LayoutProps = {
 
 const Layout: React.FC<LayoutProps> = ({ children }) => {
   return (
-    <>
-      <Header />
-      <main>{children}</main>
-      <footer></footer>
+    <div className="min-h-screen flex bg-gradient-to-r from-blue-50 via-white to-blue-100">
+      {/* Sidebar */}
+      <div className="hidden md:block">
+        <Sidebar />
+      </div>
+
+      {/* Main */}
+      <main className="flex-1 flex flex-col items-center py-10 px-4 md:py-14">
+        <div className="w-full max-w-3xl">
+          <Header />
+        </div>
+        <div className="w-full max-w-3xl bg-white/90 shadow-2xl rounded-3xl p-6 md:p-10 ring-1 ring-blue-100">
+          {children}
+        </div>
+      </main>
+
+      {/* Mobile sidebar at bottom */}
+      <div className="fixed bottom-4 left-4 right-4 md:hidden z-10">
+        <div className="bg-white/95 backdrop-blur rounded-2xl shadow-xl ring-1 ring-blue-100 p-4">
+          <Sidebar />
+        </div>
+      </div>
+
       <ToastContainer
         position="top-right"
-        autoClose={5000}
+        autoClose={3000}
         hideProgressBar={false}
         newestOnTop
         closeOnClick
@@ -24,8 +44,9 @@ const Layout: React.FC<LayoutProps> = ({ children }) => {
         draggable
         pauseOnHover
         theme="light"
+        className="!z-50"
       />
-    </>
+    </div>
   );
 };
 

frontend/src/utils/toastify.ts

@@ -0,0 +1,17 @@
+import { toast, type ToastOptions } from "react-toastify";
+
+export type ToastType = "success" | "error" | "info" | "warning";
+
+export const myToast = (message: string, msgType: ToastType) => {
+  let config: ToastOptions = {
+    position: "top-right",
+    autoClose: 5000,
+    hideProgressBar: false,
+    closeOnClick: true,
+    pauseOnHover: true,
+    draggable: true,
+    progress: undefined,
+    theme: "light",
+  };
+  toast[msgType](message, config);
+};