added source code button

- Removed obsolete PDF file from the mock directory.
- Updated index.html to change the favicon and title for the application.
- Deleted unused vite.svg file and replaced it with shapes.svg.
- Enhanced App component layout and styling.
- Refined Form1 component with better spacing and updated styles.
- Improved Form2 component to enhance item selection UI and responsiveness.
- Updated Form4 component to improve loan display and interaction.
- Enhanced Header component styling for better visibility.
- Refined LoginForm component for a more modern look.
- Updated Object component styles for better text visibility.
- Improved Sidebar component layout and item display.
- Updated global CSS for better touch target improvements.
- Enhanced Layout component for better responsiveness and structure.
- Updated main.tsx to change toast notification theme.
- Updated tailwind.config.js to include index.html for Tailwind CSS processing.

.gitignore

@@ -112,3 +112,5 @@ backend/public/uploads/
 config/
 secrets/
 keys/
+
+ToDo.txt

Docs/HELP.md

@@ -0,0 +1,11 @@
+# Hilfe Seite
+
+Hier finden Sie Informationen zur Verwendung des Systems.
+
+## Unerwartete Probleme
+
+Falls unerwartetet Probleme im Web oder im Safe auftreten sollten, können Sie den Support via Teams kontaktieren.
+
+**Kontaktpersonen:**
+- Theis Gaedigk (Web & Safe)
+- Niklas Brunke (Safe)

Docs/backend_API_docs/README.md

@@ -8,7 +8,7 @@ On this page you will learn how my API works.
 
 When you look at my backend folder and file structure, you can see that I have two files called `API`. The first file called `api.js` is for my web frontend, because this file works together with my JWT token service.
 
-But I have built a second API. You can see the second API file in the same directory, the file is called `apiV2.js`.
+**\*But I have built a second API. You can see the second API file in the same directory, the file is called `apiV2.js`.**
 
 This is the file that you can use to build an API.
 
@@ -24,6 +24,16 @@ Example: `/apiV2/items/{ADMIN_ID}`
 
 ---
 
+## URL
+
+- The frontend is currently running on `https://insta.the1s.de`.
+
+- The backend is currently running on `https://backend.insta.the1s.de`.
+
+You can see the status of this and all my other services at `https://status.the1s.de`.
+
+---
+
 ## Current endpoints
 
 ### 1. Get All Items
@@ -35,21 +45,114 @@ Returns a list of all items and their details.
 #### Example Request
 
 ```
-GET /apiV2/items/your_admin_key
+GET https://backend.insta.the1s.de/apiV2/items/your_admin_key
 ```
 
 #### Example Response
 
 ```
-[
+{
+  "data": [
     {
       "id": 1,
       "item_name": "DJI 1er Mikro",
-    "can_borrow_role": "4",
-    "inSafe": 1
+      "can_borrow_role": 4,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
     },
-  ...
+    {
+      "id": 2,
+      "item_name": "DJI 2er Mikro 1",
+      "can_borrow_role": 4,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 3,
+      "item_name": "DJI 2er Mikro 2",
+      "can_borrow_role": 4,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 4,
+      "item_name": "Rode Richt Mikrofon",
+      "can_borrow_role": 2,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 5,
+      "item_name": "Kamera Stativ",
+      "can_borrow_role": 1,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 6,
+      "item_name": "SONY Kamera - inkl. Akkus und Objektiv",
+      "can_borrow_role": 1,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 7,
+      "item_name": "MacBook inkl. Adapter",
+      "can_borrow_role": 2,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 8,
+      "item_name": "SD Karten",
+      "can_borrow_role": 3,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 9,
+      "item_name": "Kameragimbal",
+      "can_borrow_role": 1,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 10,
+      "item_name": "ATEM MINI PRO",
+      "can_borrow_role": 1,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 11,
+      "item_name": "Handygimbal",
+      "can_borrow_role": 4,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 12,
+      "item_name": "Kameralfter",
+      "can_borrow_role": 1,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 13,
+      "item_name": "Kleine Kamera 1 - inkl. Objektiv",
+      "can_borrow_role": 2,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    },
+    {
+      "id": 14,
+      "item_name": "Kleine Kamera 2 - inkl. Objektiv",
+      "can_borrow_role": 2,
+      "inSafe": 1,
+      "entry_created_at": "2025-08-19T22:02:16.000Z"
+    }
   ]
+}
 ```
 
 Each item has the following properties:
@@ -57,7 +160,9 @@ Each item has the following properties:
 - `id`: The unique identifier for the item.
 - `item_name`: The name of the item.
 - `can_borrow_role`: The role ID that is allowed to borrow the item.
-- `inSafe`: Indicates whether the item is currently in the locker (1) or not (0).
+- `inSafe`: Indicates whether the item is currently in the locker (1) or not (0). This variable/state can change over time.
+
+_You also get an http 200 status code._
 
 ---
 
@@ -72,7 +177,7 @@ Updates the `inSafe` state of an item (whether it is in the locker).
 #### Example Request
 
 ```
-POST /apiV2/controlInSafe/your_admin_key/5/0
+POST https://backend.insta.the1s.de/apiV2/controlInSafe/your_admin_key/item_id/new_item_state
 ```
 
 #### Example Response
@@ -81,6 +186,10 @@ POST /apiV2/controlInSafe/your_admin_key/5/0
 {}
 ```
 
+_An empty object means, that the operation was successful and no further information is returned._
+
+_You also get an http 200 status code._
+
 ---
 
 ### 3. Set Return Date
@@ -94,7 +203,7 @@ Sets the `returned_date` of a loan to the current server time.
 #### Example Request
 
 ```
-POST /apiV2/setReturnDate/your_admin_key/123456
+POST https://backend.insta.the1s.de/apiV2/setReturnDate/your_admin_key/your_loan_code
 ```
 
 #### Example Response
@@ -103,6 +212,10 @@ POST /apiV2/setReturnDate/your_admin_key/123456
 {}
 ```
 
+_An empty object means, that the operation was successful and no further information is returned._
+
+_You also get an http 200 status code._
+
 ---
 
 ### 4. Set Take Date
@@ -116,7 +229,7 @@ Sets the `take_date` of a loan to the current server time.
 #### Example Request
 
 ```
-POST /apiV2/setTakeDate/your_admin_key/123456
+POST https://backend.insta.the1s.de/apiV2/setTakeDate/your_admin_key/your_loan_code
 ```
 
 #### Example Response
@@ -125,6 +238,61 @@ POST /apiV2/setTakeDate/your_admin_key/123456
 {}
 ```
 
+_An empty object means, that the operation was successful and no further information is returned._
+
+_You also get an http 2xx status code._
+
+---
+
+### 5. Get whole loan by loan code
+
+**POST** `/getLoanByCode/:key/:loan_code`
+
+Retrieves the details of a specific loan by its unique code.
+
+- `loan_code`: The unique code of the loan.
+
+#### Example Request
+
+```
+GET https://backend.insta.the1s.de/getLoanByCode/your_admin_key/your_loan_code
+```
+
+#### Example Response
+
+```
+{
+  "data": {
+    "id": 6,
+    "username": "theis",
+    "loan_code": 646473,
+    "start_date": "2025-08-25T13:23:00.000Z",
+    "end_date": "2025-08-26T13:23:00.000Z",
+    "take_date": null,
+    "returned_date": null,
+    "created_at": "2025-08-20T11:23:40.000Z",
+    "loaned_items_id": [
+      8,
+      9
+    ],
+    "loaned_items_name": [
+      "SD Karten",
+      "Kameragimbal"
+    ]
+  }
+}
+```
+
+_You also get an http 200 status code._
+
+If the loan id does not exist, you will receive a 404 status code and an error message.
+
+```
+{
+  "message": "Loan not found"
+}
+```
+
 ---
 
 ## Error Handling

backend/routes/api.js

@@ -11,7 +11,6 @@ import {
 import { authenticate, generateToken } from "../services/tokenService.js";
 const router = express.Router();
 
-// Example endpoint
 router.post("/login", async (req, res) => {
   const result = await loginFunc(req.body.username, req.body.password);
   if (result.success) {

backend/routes/apiV2.js

@@ -5,6 +5,7 @@ import {
   changeInSafeStateV2,
   setReturnDateV2,
   setTakeDateV2,
+  getLoanByCodeV2,
 } from "../services/database.js";
 
 dotenv.config();
@@ -44,6 +45,19 @@ router.post("/controlInSafe/:key/:itemId/:state", async (req, res) => {
   }
 });
 
+router.get("/getLoanByCode/:key/:loan_code", async (req, res) => {
+  if (req.params.key === process.env.ADMIN_ID) {
+    const loan_code = req.params.loan_code;
+
+    const result = await getLoanByCodeV2(loan_code);
+    if (result.success) {
+      res.status(200).json({ data: result.data });
+    } else {
+      res.status(404).json({ message: "Loan not found" });
+    }
+  }
+});
+
 // Route for API to set the return date
 router.post("/setReturnDate/:key/:loan_code", async (req, res) => {
   if (req.params.key === process.env.ADMIN_ID) {

backend/services/database.js

@@ -28,6 +28,17 @@ export const getItemsFromDatabaseV2 = async () => {
   return { success: false };
 };
 
+export const getLoanByCodeV2 = async (loan_code) => {
+  const [result] = await pool.query(
+    "SELECT * FROM loans WHERE loan_code = ?;",
+    [loan_code]
+  );
+  if (result.length > 0) {
+    return { success: true, data: result[0] };
+  }
+  return { success: false };
+};
+
 export const changeInSafeStateV2 = async (itemId, state) => {
   const [result] = await pool.query(
     "UPDATE items SET inSafe = ? WHERE id = ?",

frontend/index.html

@@ -1,10 +1,10 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <link rel="icon" type="image/svg+xml" href="/shapes.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Vite + React + TS</title>
+    <title>Ausleihsystem</title>
   </head>
   <body>
     <div id="root"></div>

frontend/package-lock.json

@@ -9,7 +9,7 @@
       "version": "0.0.0",
       "dependencies": {
         "@tailwindcss/vite": "^4.1.11",
-        "@tanstack/react-query": "^5.85.0",
+        "@tanstack/react-query": "^5.85.5",
         "js-cookie": "^3.0.5",
         "lucide-react": "^0.539.0",
         "primeicons": "^7.0.0",
@@ -1836,9 +1836,9 @@
       }
     },
     "node_modules/@tanstack/query-core": {
-      "version": "5.85.3",
-      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.85.3.tgz",
-      "integrity": "sha512-9Ne4USX83nHmRuEYs78LW+3lFEEO2hBDHu7mrdIgAFx5Zcrs7ker3n/i8p4kf6OgKExmaDN5oR0efRD7i2J0DQ==",
+      "version": "5.85.5",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.85.5.tgz",
+      "integrity": "sha512-KO0WTob4JEApv69iYp1eGvfMSUkgw//IpMnq+//cORBzXf0smyRwPLrUvEe5qtAEGjwZTXrjxg+oJNP/C00t6w==",
       "license": "MIT",
       "funding": {
         "type": "github",
@@ -1846,12 +1846,12 @@
       }
     },
     "node_modules/@tanstack/react-query": {
-      "version": "5.85.3",
-      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.85.3.tgz",
-      "integrity": "sha512-AqU8TvNh5GVIE8I+TUU0noryBRy7gOY0XhSayVXmOPll4UkZeLWKDwi0rtWOZbwLRCbyxorfJ5DIjDqE7GXpcQ==",
+      "version": "5.85.5",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.85.5.tgz",
+      "integrity": "sha512-/X4EFNcnPiSs8wM2v+b6DqS5mmGeuJQvxBglmDxl6ZQb5V26ouD2SJYAcC3VjbNwqhY2zjxVD15rDA5nGbMn3A==",
       "license": "MIT",
       "dependencies": {
-        "@tanstack/query-core": "5.85.3"
+        "@tanstack/query-core": "5.85.5"
       },
       "funding": {
         "type": "github",

frontend/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@tailwindcss/vite": "^4.1.11",
-    "@tanstack/react-query": "^5.85.0",
+    "@tanstack/react-query": "^5.85.5",
     "js-cookie": "^3.0.5",
     "lucide-react": "^0.539.0",
     "primeicons": "^7.0.0",

frontend/public/shapes.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-shapes-icon lucide-shapes"><path d="M8.3 10a.7.7 0 0 1-.626-1.079L11.4 3a.7.7 0 0 1 1.198-.043L16.3 8.9a.7.7 0 0 1-.572 1.1Z"/><rect x="3" y="14" width="7" height="7" rx="1"/><circle cx="17.5" cy="17.5" r="3.5"/></svg>

frontend/public/vite.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>

frontend/src/App.tsx

@@ -6,7 +6,11 @@ import Form2 from "./components/Form2";
 import Form4 from "./components/Form4";
 import LoginForm from "./components/LoginForm";
 import Cookies from "js-cookie";
-import { fetchAllData, ALL_ITEMS_UPDATED_EVENT } from "./utils/fetchData";
+import {
+  fetchAllData,
+  ALL_ITEMS_UPDATED_EVENT,
+  AUTH_LOGOUT_EVENT,
+} from "./utils/fetchData";
 import { myToast } from "./utils/toastify";
 
 function App() {
@@ -18,18 +22,23 @@ function App() {
       setIsLoggedIn(true);
       fetchAllData(token);
     }
-
     localStorage.setItem("borrowableItems", JSON.stringify([]));
   }, []);
 
-  // Mock flow without real logic: show the three sections stacked for design preview
+  useEffect(() => {
+    const onAuthLogout = () => {
+      setIsLoggedIn(false);
+    };
+    window.addEventListener(AUTH_LOGOUT_EVENT, onAuthLogout);
+    return () => window.removeEventListener(AUTH_LOGOUT_EVENT, onAuthLogout);
+  }, []);
+
   const handleLogout = () => {
     Cookies.remove("token");
     localStorage.removeItem("allItems");
     localStorage.removeItem("allLoans");
     localStorage.removeItem("userLoans");
     localStorage.removeItem("borrowableItems");
-    // Let listeners refresh from empty state
     window.dispatchEvent(new Event(ALL_ITEMS_UPDATED_EVENT));
     myToast("Logged out successfully!", "success");
     setIsLoggedIn(false);
@@ -37,11 +46,11 @@ function App() {
 
   return isLoggedIn ? (
     <Layout onLogout={handleLogout}>
-      <div className="space-y-10">
+      <div className="space-y-6">
         <Form1 />
-        <div className="h-px bg-blue-100" />
+        <div className="h-px bg-slate-200" />
         <Form2 />
-        <div className="h-px bg-blue-100" />
+        <div className="h-px bg-slate-200" />
         <Form4 />
       </div>
     </Layout>

frontend/src/components/Footer.tsx

@@ -0,0 +1,12 @@
+import React from "react";
+
+const Footer: React.FC = () => {
+  return (
+    <footer className="fixed bottom-0 left-0 text-sm w-full bg-slate-100 text-center py-2 border-t border-slate-200 z-50">
+      <p>Made with ❤️ by Theis Gaedigk - Jahrgang 2019</p>
+      <p>v1.1</p>
+    </footer>
+  );
+};
+
+export default Footer;

frontend/src/components/Form1.tsx

@@ -4,10 +4,12 @@ import { getBorrowableItems } from "../utils/fetchData";
 
 const Form1: React.FC = () => {
   return (
-    <div className="space-y-6">
-      <h2 className="text-xl font-bold text-blue-700">1. Zeitraum wählen</h2>
+    <div className="space-y-4">
+      <h2 className="text-lg sm:text-xl font-bold text-slate-900">
+        1. Zeitraum wählen
+      </h2>
       <form
-        className="space-y-4"
+        className="space-y-3"
         onSubmit={(e) => {
           e.preventDefault();
           const form = e.currentTarget as HTMLFormElement;
@@ -17,13 +19,13 @@ const Form1: React.FC = () => {
           Cookies.set("startDate", start);
           Cookies.set("endDate", end);
           getBorrowableItems();
-          console.log("Zeitraum erfolgreich gesetzt!");
         }}
       >
+        <div className="grid grid-cols-1 sm:grid-cols-2 gap-3">
           <div>
             <label
               htmlFor="startDate"
-            className="block text-sm font-medium text-blue-800 mb-1"
+              className="block text-sm font-medium text-slate-700 mb-1"
             >
               Start
             </label>
@@ -31,13 +33,13 @@ const Form1: React.FC = () => {
               type="datetime-local"
               id="startDate"
               name="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"
+              className="w-full border border-slate-300 rounded-lg px-3 py-2.5 focus:ring-2 focus:ring-indigo-500 focus:outline-none bg-white"
             />
           </div>
           <div>
             <label
               htmlFor="endDate"
-            className="block text-sm font-medium text-blue-800 mb-1"
+              className="block text-sm font-medium text-slate-700 mb-1"
             >
               Ende
             </label>
@@ -45,12 +47,13 @@ const Form1: React.FC = () => {
               type="datetime-local"
               id="endDate"
               name="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"
+              className="w-full border border-slate-300 rounded-lg px-3 py-2.5 focus:ring-2 focus:ring-indigo-500 focus:outline-none bg-white"
             />
           </div>
+        </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"
+          className="w-full bg-indigo-600 text-white font-bold py-2.5 px-4 rounded-lg shadow hover:bg-indigo-700 transition"
         >
           Verfügbare Gegenstände anzeigen
         </button>

frontend/src/components/Form2.tsx

@@ -1,7 +1,6 @@
 import React from "react";
 import Cookies from "js-cookie";
-import { createLoan } from "../utils/userHandler";
-import { addToRemove, rmFromRemove } from "../utils/userHandler";
+import { createLoan, addToRemove, rmFromRemove } from "../utils/userHandler";
 import { BORROWABLE_ITEMS_UPDATED_EVENT } from "../utils/fetchData";
 
 interface BorrowItem {
@@ -13,12 +12,6 @@ interface BorrowItem {
 
 const LOCAL_STORAGE_KEY = "borrowableItems";
 
-const isBorrowItem = (v: any): v is BorrowItem =>
-  v &&
-  typeof v.id === "number" &&
-  (typeof v.item_name === "string" || typeof v.name === "string") &&
-  (typeof v.can_borrow_role === "string" || typeof v.role === "string");
-
 function normalizeBorrowable(data: any): BorrowItem[] {
   const rawArr = Array.isArray(data)
     ? data
@@ -65,16 +58,13 @@ function useBorrowableItems() {
   }, []);
 
   React.useEffect(() => {
-    // Initial read
     readFromStorage();
 
-    // Cross-tab updates
     const onStorage = (e: StorageEvent) => {
       if (e.key === LOCAL_STORAGE_KEY) readFromStorage();
     };
     window.addEventListener("storage", onStorage);
 
-    // Same-tab updates via Custom Event
     const onBorrowableUpdated = () => readFromStorage();
     window.addEventListener(
       BORROWABLE_ITEMS_UPDATED_EVENT,
@@ -97,48 +87,74 @@ const Form2: React.FC = () => {
   const items = useBorrowableItems();
 
   return (
-    <div className="space-y-6">
-      <h2 className="text-xl font-bold text-blue-700">
+    <div className="space-y-4">
+      <h2 className="text-lg sm:text-xl font-bold text-slate-900">
         2. Gegenstand auswählen
       </h2>
 
       {items.length === 0 ? (
-        <div className="text-red-600 font-medium text-center bg-red-50 border border-red-200 rounded-xl p-4">
+        <div className="text-slate-700 text-center bg-slate-100 border border-slate-200 rounded-xl p-4">
           Keine Gegenstände verfügbar für diesen Zeitraum.
         </div>
       ) : (
-        <div className="overflow-x-auto rounded-xl border border-blue-100 shadow-sm bg-white/80">
-          <table className="min-w-full divide-y divide-blue-100">
-            <thead className="bg-blue-50/60">
+        <>
+          {/* Mobile: card list */}
+          <div className="sm:hidden space-y-2">
+            {items.map((item) => (
+              <label
+                key={item.id}
+                htmlFor={`item-${item.id}`}
+                className="flex items-center justify-between gap-3 p-3 rounded-lg border border-slate-200 bg-white shadow-sm"
+              >
+                <div className="min-w-0">
+                  <div className="text-sm font-medium text-slate-900 truncate">
+                    {item.item_name}
+                  </div>
+                  <div className="text-xs text-slate-500">
+                    {item.inSafe ? "Verfügbar" : "Nicht im Schließfach"}
+                  </div>
+                </div>
+                <input
+                  type="checkbox"
+                  id={`item-${item.id}`}
+                  onChange={(e) => {
+                    if (e.target.checked) addToRemove(item.id);
+                    else rmFromRemove(item.id);
+                  }}
+                  className="h-5 w-5 accent-indigo-600"
+                />
+              </label>
+            ))}
+          </div>
+
+          {/* Desktop: table */}
+          <div className="hidden sm:block overflow-x-auto rounded-xl border border-slate-200 shadow-sm bg-white">
+            <table className="min-w-full divide-y divide-slate-200">
+              <thead className="bg-slate-50">
                 <tr>
-                <th className="px-4 py-2 text-left text-xs font-semibold text-blue-700">
+                  <th className="px-4 py-2 text-left text-xs font-semibold text-slate-700">
                     Gegenstand
                   </th>
-                <th className="px-4 py-2 text-left text-xs font-semibold text-blue-700">
+                  <th className="px-4 py-2 text-left text-xs font-semibold text-slate-700">
                     <input type="checkbox" className="invisible" />
                   </th>
                 </tr>
               </thead>
-            <tbody className="divide-y divide-blue-50">
+              <tbody className="divide-y divide-slate-100">
                 {items.map((item) => (
-                <tr
-                  key={item.id}
-                  className="hover:bg-blue-50/40 transition-colors"
-                >
-                  <td className="px-4 py-2 text-sm font-medium text-blue-900">
+                  <tr key={item.id} className="hover:bg-slate-50">
+                    <td className="px-4 py-2 text-sm font-medium text-slate-900">
                       {item.item_name}
                     </td>
-                  <td className="px-4 py-2 text-sm text-blue-700">
+                    <td className="px-4 py-2 text-sm text-slate-700 text-right">
                       <input
                         type="checkbox"
                         onChange={(e) => {
-                        if (e.target.checked) {
-                          addToRemove(item.id);
-                        } else {
-                          rmFromRemove(item.id);
-                        }
+                          if (e.target.checked) addToRemove(item.id);
+                          else rmFromRemove(item.id);
                         }}
                         id={`item-${item.id}`}
+                        className="h-4 w-4 accent-indigo-600"
                       />
                     </td>
                   </tr>
@@ -146,9 +162,10 @@ const Form2: React.FC = () => {
               </tbody>
             </table>
           </div>
+        </>
       )}
 
-      <div className="flex flex-col sm:flex-row gap-3 pt-2">
+      <div className="flex flex-col sm:flex-row gap-3 pt-1">
         <button
           onClick={() => {
             createLoan(
@@ -157,7 +174,7 @@ const Form2: React.FC = () => {
             );
           }}
           type="button"
-          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"
+          className="w-full sm:w-44 bg-indigo-600 text-white font-bold py-2.5 px-4 rounded-lg shadow hover:bg-indigo-700 transition"
         >
           Ausleihen
         </button>

frontend/src/components/Form4.tsx

@@ -1,6 +1,9 @@
-import React, { useEffect, useState } from "react";
+import React from "react";
 import { Trash, ArrowLeftRight } from "lucide-react";
 import { handleDeleteLoan } from "../utils/userHandler";
+import { useMutation, useQuery } from "@tanstack/react-query";
+import Cookies from "js-cookie";
+import { queryClient } from "../utils/queryClient";
 
 type Loan = {
   id: number;
@@ -22,45 +25,43 @@ const formatDate = (iso: string | null) => {
   return d.toLocaleString("de-DE", { dateStyle: "short", timeStyle: "short" });
 };
 
-const readUserLoansFromStorage = (): Loan[] => {
-  const raw = localStorage.getItem("userLoans");
-  if (!raw || raw === '"No loans found for this user"') return [];
-  try {
-    const parsed = JSON.parse(raw);
-    return Array.isArray(parsed) ? (parsed as Loan[]) : [];
-  } catch {
-    return [];
+async function fetchUserLoans(): Promise<Loan[]> {
+  const res = await fetch("http://localhost:8002/api/userLoans", {
+    method: "GET",
+    headers: { Authorization: `Bearer ${Cookies.get("token") || ""}` },
+  });
+  if (!res.ok) throw new Error("Failed to fetch user loans");
+  const data = await res.json();
+  if (data === "No loans found for this user") return [];
+  return Array.isArray(data) ? (data as Loan[]) : [];
 }
-};
 
 const Form4: React.FC = () => {
-  const [userLoans, setUserLoans] = useState<Loan[]>(() =>
-    readUserLoansFromStorage()
-  );
+  const { data: userLoans = [], isFetching } = useQuery({
+    queryKey: ["userLoans"],
+    queryFn: fetchUserLoans,
+  });
 
-  // Keep in sync if localStorage changes (e.g., other tabs or parts of the app)
-  useEffect(() => {
-    const onStorage = (e: StorageEvent) => {
-      if (e.key === "userLoans") {
-        setUserLoans(readUserLoansFromStorage());
-      }
-    };
-    window.addEventListener("storage", onStorage);
-    return () => window.removeEventListener("storage", onStorage);
-  }, []);
+  const deleteMutation = useMutation({
+    mutationFn: (loanID: number) => handleDeleteLoan(loanID),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["userLoans"] });
+    },
+  });
 
-  const onDelete = async (loanID: number) => {
-    const ok = await handleDeleteLoan(loanID);
-    if (ok) {
-      setUserLoans((prev) =>
-        prev.filter((l) => Number(l.id) !== Number(loanID))
+  const onDelete = (loanID: number) => deleteMutation.mutate(loanID);
+
+  if (isFetching) {
+    return (
+      <div className="rounded-xl border border-slate-200 bg-white p-6 text-center text-slate-600 shadow-sm">
+        <p>Lade Ausleihen…</p>
+      </div>
     );
   }
-  };
 
   if (userLoans.length === 0) {
     return (
-      <div className="rounded-xl border border-gray-200 bg-white p-6 text-center text-gray-600 shadow-sm">
+      <div className="rounded-xl border border-slate-200 bg-white p-6 text-center text-slate-600 shadow-sm">
         <p>Keine Ausleihen gefunden.</p>
       </div>
     );
@@ -68,71 +69,117 @@ const Form4: React.FC = () => {
 
   return (
     <div className="space-y-3">
-      <p className="text-lg font-semibold tracking-tight text-gray-900">
+      <p className="text-lg font-semibold tracking-tight text-slate-900">
         Meine Ausleihen
       </p>
-      <p className="text-sm text-gray-600">
-        Wenn du eine Ausleihe ändern oder löschen möchtest, klicke auf das
-        Papierkorb-Symbol.
+      <p className="text-sm text-slate-600">
+        Tippe auf das Papierkorb-Symbol, um eine Ausleihe zu löschen.
       </p>
 
-      <div className="rounded-xl border border-gray-200 bg-white shadow-sm">
+      {/* Mobile: cards */}
+      <div className="space-y-2 sm:hidden">
+        {userLoans.map((loan) => (
+          <div
+            key={loan.id}
+            className="rounded-xl border border-slate-200 bg-white p-3 shadow-sm"
+          >
+            <div className="flex items-start justify-between gap-3">
+              <div className="min-w-0">
+                <div className="text-sm font-semibold text-slate-900">
+                  Leihcode: <span className="font-mono">{loan.loan_code}</span>
+                </div>
+                <div className="mt-1 grid grid-cols-2 gap-x-4 gap-y-1 text-xs text-slate-700">
+                  <div>
+                    <span className="text-slate-500">Start:</span>{" "}
+                    {formatDate(loan.start_date)}
+                  </div>
+                  <div>
+                    <span className="text-slate-500">Ende:</span>{" "}
+                    {formatDate(loan.end_date)}
+                  </div>
+                  <div>
+                    <span className="text-slate-500">Abgeholt:</span>{" "}
+                    {formatDate(loan.take_date)}
+                  </div>
+                  <div>
+                    <span className="text-slate-500">Zurück:</span>{" "}
+                    {formatDate(loan.returned_date)}
+                  </div>
+                </div>
+                <div className="mt-2 text-xs text-slate-700">
+                  <span className="text-slate-500">Gegenstände:</span>{" "}
+                  {Array.isArray(loan.loaned_items_name)
+                    ? loan.loaned_items_name.join(", ")
+                    : "-"}
+                </div>
+              </div>
+              <button
+                onClick={() => onDelete(loan.id)}
+                aria-label="Ausleihe löschen"
+                className="flex items-center justify-center rounded-md p-2 text-slate-600 hover:bg-red-50 hover:text-red-600 focus:outline-none focus:ring-2 focus:ring-red-500/30"
+              >
+                <Trash className="h-5 w-5" />
+              </button>
+            </div>
+          </div>
+        ))}
+      </div>
+
+      {/* Desktop: table */}
+      <div className="hidden sm:block rounded-xl border border-slate-200 bg-white shadow-sm">
         <div className="overflow-x-auto">
-          <table className="min-w-full text-sm text-gray-700">
-            <thead className="sticky top-0 z-10 bg-gray-50">
-              <tr className="border-b border-gray-200">
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+          <table className="table-auto min-w-full text-sm text-slate-700">
+            <thead className="sticky top-0 z-10 bg-slate-50">
+              <tr className="border-b border-slate-200">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Leihcode
                 </th>
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Start
                 </th>
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Ende
                 </th>
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Abgeholt
                 </th>
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Zurückgegeben
                 </th>
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Erstellt
                 </th>
-                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Gegenstände
                 </th>
-                <th className="px-4 py-3 text-right text-xs font-semibold uppercase tracking-wider text-gray-600">
+                <th className="px-4 py-3 text-right text-xs font-semibold uppercase tracking-wider text-slate-600">
                   Aktionen
                 </th>
               </tr>
             </thead>
-            <tbody className="divide-y divide-gray-100">
+            <tbody className="divide-y divide-slate-100">
               {userLoans.map((loan) => (
-                <tr
-                  key={loan.id}
-                  className="odd:bg-white even:bg-gray-50 hover:bg-gray-100/60 transition-colors"
-                >
-                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-gray-900">
+                <tr key={loan.id} className="odd:bg-white even:bg-slate-50">
+                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-slate-900">
                     {loan.loan_code}
                   </td>
-                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-gray-900">
+                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-slate-900">
                     {formatDate(loan.start_date)}
                   </td>
-                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-gray-900">
+                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-slate-900">
                     {formatDate(loan.end_date)}
                   </td>
-                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-gray-900">
+                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-slate-900">
                     {formatDate(loan.take_date)}
                   </td>
-                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-gray-900">
+                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-slate-900">
                     {formatDate(loan.returned_date)}
                   </td>
-                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-gray-900">
+                  <td className="px-4 py-3 whitespace-nowrap font-mono tabular-nums text-slate-900">
                     {formatDate(loan.created_at)}
                   </td>
-                  <td className="px-4 py-3">
-                    <div className="max-w-[22rem] truncate text-gray-900">
+                  <td className="px-4 py-3 whitespace-nowrap">
+                    <div className="text-slate-900">
                       {Array.isArray(loan.loaned_items_name)
                         ? loan.loaned_items_name.join(", ")
                         : "-"}
@@ -142,7 +189,7 @@ const Form4: React.FC = () => {
                     <button
                       onClick={() => onDelete(loan.id)}
                       aria-label="Ausleihe löschen"
-                      className="inline-flex items-center rounded-md p-2 text-gray-500 hover:bg-red-50 hover:text-red-600 focus:outline-none focus:ring-2 focus:ring-red-500/30"
+                      className="inline-flex items-center rounded-md p-2 text-slate-600 hover:bg-red-50 hover:text-red-600 focus:outline-none focus:ring-2 focus:ring-red-500/30"
                     >
                       <Trash className="h-4 w-4" />
                     </button>
@@ -152,7 +199,6 @@ const Form4: React.FC = () => {
             </tbody>
           </table>
         </div>
-
         {/* Scroll hint */}
         <div className="border-t border-gray-100 px-4 py-2">
           <div className="flex items-center gap-2 text-xs text-gray-500">

frontend/src/components/Header.tsx

@@ -6,20 +6,34 @@ type HeaderProps = {
 
 const Header: React.FC<HeaderProps> = ({ onLogout }) => {
   return (
-    <header className="mb-6 md:mb-10">
-      <h1 className="text-3xl md:text-4xl font-extrabold text-blue-800 tracking-tight drop-shadow-sm">
+    <header className="mb-4 sm:mb-6">
+      <div className="flex items-start justify-between gap-3">
+        <div className="min-w-0">
+          <h1 className="text-2xl sm:text-3xl font-extrabold text-slate-900 tracking-tight">
             Gegenstand ausleihen
           </h1>
-      <p className="text-blue-500 mt-1 md:mt-2 text-base md:text-lg font-medium">
+          <p className="text-slate-600 mt-1 text-sm sm:text-base">
             Schnell und unkompliziert Equipment reservieren
           </p>
+        </div>
         <button
           type="button"
           onClick={onLogout}
-        className="text-blue-500 hover:underline"
+          className="h-9 px-3 rounded-md border border-slate-300 text-slate-700 hover:bg-slate-100 transition"
         >
           Logout
         </button>
+        <a href="https://git.the1s.de/Matthias-Claudius-Schule/borrow-system/src/branch/dev/Docs/HELP.md">
+          <button className="h-9 px-3 rounded-md border border-slate-300 text-slate-700 hover:bg-slate-100 transition">
+            Hilfe
+          </button>
+        </a>
+        <a href="https://git.the1s.de/Matthias-Claudius-Schule/borrow-system">
+          <button className="h-9 px-3 rounded-md border border-slate-300 text-slate-700 hover:bg-slate-100 transition">
+            Source Code
+          </button>
+        </a>
+      </div>
     </header>
   );
 };

frontend/src/components/LoginForm.tsx

@@ -1,4 +1,5 @@
 import React from "react";
+import Footer from "./Footer";
 import { useState } from "react";
 import { loginUser } from "../utils/fetchData";
 import { myToast } from "../utils/toastify";
@@ -22,16 +23,16 @@ const LoginForm: React.FC<LoginFormProps> = ({ onLogin }) => {
   };
 
   return (
-    <div className="bg-blue-950 min-h-screen">
-      <div className="max-w-sm mx-auto mt-20 bg-white rounded-xl shadow-lg p-8 border border-blue-100">
-        <h2 className="text-2xl font-bold text-blue-700 mb-6 text-center">
+    <div className="min-h-screen flex items-center justify-center bg-slate-100 p-4">
+      <div className="w-full max-w-sm bg-white rounded-2xl shadow-md p-6 sm:p-8 border border-slate-200">
+        <h2 className="text-2xl font-bold text-slate-900 mb-6 text-center">
           Login
         </h2>
-        <form onSubmit={handleSubmit} className="space-y-5">
+        <form onSubmit={handleSubmit} className="space-y-4">
           <div>
             <label
               htmlFor="username"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-slate-700 mb-1"
             >
               Username
             </label>
@@ -39,14 +40,14 @@ const LoginForm: React.FC<LoginFormProps> = ({ onLogin }) => {
               type="text"
               onChange={(e) => setUsername(e.target.value)}
               id="username"
-              className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm focus:ring-blue-500 focus:border-blue-500 px-3 py-2"
+              className="mt-1 block w-full border border-slate-300 rounded-md shadow-sm focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 px-3 py-2.5 bg-white"
               required
             />
           </div>
           <div>
             <label
               htmlFor="password"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-slate-700 mb-1"
             >
               Password
             </label>
@@ -54,18 +55,19 @@ const LoginForm: React.FC<LoginFormProps> = ({ onLogin }) => {
               onChange={(e) => setPassword(e.target.value)}
               type="password"
               id="password"
-              className="mt-1 block w-full border border-gray-300 rounded-md shadow-sm focus:ring-blue-500 focus:border-blue-500 px-3 py-2"
+              className="mt-1 block w-full border border-slate-300 rounded-md shadow-sm focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 px-3 py-2.5 bg-white"
               required
             />
           </div>
           <button
             type="submit"
-            className="w-full bg-blue-600 text-white font-bold py-2 px-4 rounded-md shadow hover:bg-blue-700 transition"
+            className="w-full bg-indigo-600 text-white font-bold py-2.5 px-4 rounded-md shadow hover:bg-indigo-700 transition"
           >
             Login
           </button>
         </form>
       </div>
+      <Footer />
     </div>
   );
 };

frontend/src/components/Object.tsx

@@ -7,9 +7,9 @@ type ObjectProps = {
 
 const Object: React.FC<ObjectProps> = ({ title, description }) => {
   return (
-    <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 className="min-w-0">
+      <h3 className="text-sm font-semibold text-slate-900">{title}</h3>
+      <p className="text-xs text-slate-600 line-clamp-2">{description}</p>
     </div>
   );
 };

frontend/src/components/Sidebar.tsx

@@ -1,5 +1,6 @@
 import React, { useEffect, useState } from "react";
 import Object from "./Object";
+import { MonitorSmartphone } from "lucide-react";
 import { ALL_ITEMS_UPDATED_EVENT } from "../utils/fetchData";
 
 const Sidebar: React.FC = () => {
@@ -12,57 +13,51 @@ const Sidebar: React.FC = () => {
       const next = JSON.parse(localStorage.getItem("allItems") || "[]");
       setItems(next);
     };
-    // Update immediately in case data changed before this mounted
     handler();
     window.addEventListener(ALL_ITEMS_UPDATED_EVENT, handler);
     return () => window.removeEventListener(ALL_ITEMS_UPDATED_EVENT, handler);
   }, []);
 
   const outCount = items.reduce((n, it) => n + (it.inSafe ? 0 : 1), 0);
-  const sorted = [...items].sort((a, b) => Number(a.inSafe) - Number(b.inSafe)); // außerhalb zuerst
+  const sorted = [...items].sort((a, b) => Number(a.inSafe) - Number(b.inSafe));
 
   return (
-    <aside className="w-full md:w-80 md:h-screen md:sticky md:top-0 overflow-y-auto 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 justify-between">
-        <span className="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>
-          Geräte Übersicht
+    <aside className="w-full md:w-72 md:h-full flex flex-col rounded-2xl pt-0 px-3 pb-3 sm:pt-0 sm:px-4 sm:pb-4 bg-gradient-to-b from-white to-slate-50 ring-1 ring-slate-200/70 shadow-md overflow-hidden">
+      <div className="sticky top-0 z-10 -mx-3 sm:-mx-4 px-3 sm:px-4 py-2.5 bg-white/85 backdrop-blur supports-[backdrop-filter]:backdrop-blur border-b border-slate-200/70 text-lg sm:text-xl font-bold mb-3 text-slate-900 tracking-tight flex items-center justify-between gap-2 rounded-t-2xl">
+        <span className="flex items-center gap-2 min-w-0 flex-1 truncate">
+          <MonitorSmartphone className="w-5 h-5 text-slate-700 shrink-0" />
+          <span className="truncate">Geräte</span>
         </span>
         {outCount > 0 && (
-          <span className="text-xs px-2 py-0.5 rounded-full bg-red-100 text-red-700">
+          <span className="inline-flex items-center gap-1 whitespace-nowrap tabular-nums text-[10px] sm:text-xs px-2.5 py-1 rounded-full bg-amber-50 text-amber-700 ring-1 ring-amber-200/70 shadow-sm font-medium">
             {outCount} außerhalb
           </span>
         )}
-      </h2>
+      </div>
 
-      <div className="space-y-4 flex-1 pr-1">
+      {/* Scroll area */}
+      <div className="flex-1 min-h-0 overflow-y-auto overflow-x-hidden">
+        <div className="flex flex-col gap-3 md:space-y-3">
           {sorted.map((item: any) => (
             <div
               key={item.item_name}
-            className={`bg-white/80 rounded-xl p-4 shadow hover:shadow-md transition ${
-              item.inSafe ? "" : "ring-1 ring-red-200"
+              className={`group relative w-full bg-white rounded-xl p-3 sm:p-4 ring-1 ring-slate-200/70 duration-200 hover:shadow-md focus-within:ring-slate-300 ${
+                item.inSafe
+                  ? "border-l-4 border-emerald-400"
+                  : "border-l-4 border-red-400 ring-red-200/60 bg-red-50/40"
               }`}
             >
               <div className="flex items-start gap-3">
-              <span className="relative mt-1 inline-flex" aria-hidden="true">
+                <span
+                  className="relative mt-0.5 inline-flex"
+                  aria-hidden="true"
+                >
                   {!item.inSafe && (
                     <span className="absolute inline-flex h-3 w-3 rounded-full bg-red-400 opacity-75 animate-ping"></span>
                   )}
                   <span
-                  className={`inline-block w-3 h-3 rounded-full ${
-                    item.inSafe ? "bg-green-400" : "bg-red-500"
+                    className={`inline-block w-3 h-3 rounded-full ring-2 ring-white ${
+                      item.inSafe ? "bg-emerald-500" : "bg-red-500"
                     }`}
                     title={
                       item.inSafe ? "Im Schließfach" : "Nicht im Schließfach"
@@ -75,7 +70,9 @@ const Sidebar: React.FC = () => {
                 <Object
                   title={item.item_name}
                   description={
-                  item.inSafe ? "Im Schließfach" : "Nicht im Schließfach"
+                    item.inSafe
+                      ? "Aktuell im Schließfach"
+                      : "Aktuell nicht im Schließfach"
                   }
                 />
               </div>
@@ -83,11 +80,16 @@ const Sidebar: React.FC = () => {
           ))}
         </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-red-400 rounded-full"></span>
+        <div className="mt-4 pt-3 border-t border-slate-200/70 text-[10px] sm:text-xs text-slate-500 items-center gap-4 hidden md:flex">
+          <span className="inline-flex items-center gap-1">
+            <span className="inline-block w-3 h-3 bg-emerald-500 rounded-full ring-2 ring-white shadow-sm"></span>
+            Im Schließfach
+          </span>
+          <span className="inline-flex items-center gap-1">
+            <span className="inline-block w-3 h-3 bg-red-500 rounded-full ring-2 ring-white shadow-sm"></span>
             Außerhalb des Schließfachs
+          </span>
+        </div>
       </div>
     </aside>
   );

frontend/src/index.css

@@ -1 +1,12 @@
+/* Tailwind (v4) */
 @import "tailwindcss";
+
+/* Small touch target improvements */
+@layer base {
+  html:focus-within {
+    scroll-behavior: smooth;
+  }
+  :root {
+    color-scheme: light;
+  }
+}

frontend/src/layout/Layout.tsx

@@ -2,6 +2,7 @@ import React from "react";
 import "../App.css";
 import Header from "../components/Header";
 import Sidebar from "../components/Sidebar";
+import Footer from "../components/Footer";
 
 type LayoutProps = {
   children: React.ReactNode;
@@ -10,28 +11,24 @@ type LayoutProps = {
 
 const Layout: React.FC<LayoutProps> = ({ children, onLogout }) => {
   return (
-    <div className="min-h-screen flex bg-gradient-to-r from-blue-50 via-white to-blue-100">
-      {/* Sidebar */}
-      <div className="hidden md:block">
+    <div className="h-screen flex flex-col bg-slate-50 text-slate-800">
+      {/* Main */}
+      <main className="flex-1 min-h-0 overflow-hidden flex flex-col items-center px-3 sm:px-5 py-4 sm:py-8 pb-12">
+        <div className="w-full max-w-5xl flex flex-col gap-3 md:flex-row md:gap-6 md:items-stretch min-h-0 h-full">
+          <div className="hidden md:flex md:flex-col md:shrink-0 md:w-72 md:min-h-0 md:h-full">
             <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">
+          <div className="flex-1 min-w-0 min-h-0 h-full flex flex-col overflow-hidden">
+            <div className="w-full">
               <Header onLogout={onLogout} />
             </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">
+            <div className="w-full bg-white shadow-md md:shadow-lg rounded-2xl p-4 sm:p-6 ring-1 ring-slate-200 flex-1 min-h-0 overflow-y-auto">
               {children}
             </div>
+          </div>
+        </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>
+      <Footer />
     </div>
   );
 };

frontend/src/main.tsx

@@ -2,11 +2,14 @@ import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import "./index.css";
 import App from "./App.tsx";
-import { ToastContainer } from "react-toastify";
+import { ToastContainer, Flip } from "react-toastify";
 import "react-toastify/dist/ReactToastify.css";
+import { QueryClientProvider } from "@tanstack/react-query";
+import { queryClient } from "./utils/queryClient";
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
+    <QueryClientProvider client={queryClient}>
       <App />
       <ToastContainer
         position="top-right"
@@ -15,11 +18,12 @@ createRoot(document.getElementById("root")!).render(
         newestOnTop
         closeOnClick
         rtl={false}
-      pauseOnFocusLoss={false}
+        pauseOnFocusLoss
         draggable
         pauseOnHover
-      theme="light"
-      style={{ zIndex: 9999 }}
+        theme="colored"
+        transition={Flip}
       />
+    </QueryClientProvider>
   </StrictMode>
 );

frontend/src/utils/fetchData.ts

@@ -4,6 +4,22 @@ import { myToast } from "./toastify";
 // Event name used to notify the app when the list of items has been updated
 export const ALL_ITEMS_UPDATED_EVENT = "allItemsUpdated";
 export const BORROWABLE_ITEMS_UPDATED_EVENT = "borrowableItemsUpdated";
+export const AUTH_LOGOUT_EVENT = "authLogout";
+
+let sendError = false;
+
+function logout() {
+  Cookies.remove("token");
+  Cookies.remove("startDate");
+  Cookies.remove("endDate");
+  localStorage.removeItem("allItems");
+  localStorage.removeItem("allLoans");
+  localStorage.removeItem("userLoans");
+  localStorage.removeItem("borrowableItems");
+  window.dispatchEvent(new Event(ALL_ITEMS_UPDATED_EVENT));
+  window.dispatchEvent(new Event(BORROWABLE_ITEMS_UPDATED_EVENT));
+  window.dispatchEvent(new Event(AUTH_LOGOUT_EVENT));
+}
 
 export const fetchAllData = async (token: string | undefined) => {
   if (!token) return;
@@ -16,6 +32,16 @@ export const fetchAllData = async (token: string | undefined) => {
       },
     });
 
+    if (response.status === 500) {
+      if (!sendError) {
+        sendError = true;
+        myToast("Session expired. Please log in again.", "error");
+        logout();
+        return;
+      }
+      return;
+    }
+
     if (!response.ok) {
       myToast("Failed to fetch items", "error");
       return;
@@ -38,6 +64,16 @@ export const fetchAllData = async (token: string | undefined) => {
       },
     });
 
+    if (response.status === 500) {
+      if (!sendError) {
+        sendError = true;
+        myToast("Session expired. Please log in again.", "error");
+        logout();
+        return;
+      }
+      return;
+    }
+
     if (!response.ok) {
       myToast("Failed to fetch loans!", "error");
       return;
@@ -60,6 +96,16 @@ export const fetchAllData = async (token: string | undefined) => {
       },
     });
 
+    if (response.status === 500) {
+      if (!sendError) {
+        sendError = true;
+        myToast("Session expired. Please log in again.", "error");
+        logout();
+        return;
+      }
+      return;
+    }
+
     if (!response.ok) {
       myToast("Failed to fetch user loans!", "error");
       return;
@@ -122,6 +168,16 @@ export const getBorrowableItems = async () => {
       body: JSON.stringify({ startDate, endDate }),
     });
 
+    if (response.status === 500) {
+      if (!sendError) {
+        sendError = true;
+        myToast("Session expired. Please log in again.", "error");
+        logout();
+        return;
+      }
+      return;
+    }
+
     if (!response.ok) {
       myToast("Failed to fetch borrowable items", "error");
       return;

frontend/src/utils/queryClient.ts

@@ -0,0 +1,11 @@
+import { QueryClient } from "@tanstack/react-query";
+
+// Central QueryClient instance so utilities (e.g. file upload) can invalidate queries.
+export const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      refetchOnWindowFocus: false,
+      retry: 1,
+    },
+  },
+});

frontend/src/utils/toastify.ts

@@ -1,17 +1,18 @@
-import { toast, type ToastOptions } from "react-toastify";
+import { toast, Flip, 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,
+    autoClose: 3000,
     hideProgressBar: false,
     closeOnClick: true,
     pauseOnHover: true,
     draggable: true,
     progress: undefined,
-    theme: "light",
+    theme: "colored",
+    transition: Flip,
   };
   toast[msgType](message, config);
 };

frontend/src/utils/userHandler.ts

@@ -1,5 +1,6 @@
 import { myToast } from "./toastify";
 import Cookies from "js-cookie";
+import { queryClient } from "./queryClient";
 
 export const handleDeleteLoan = async (loanID: number): Promise<boolean> => {
   try {
@@ -92,5 +93,10 @@ export const createLoan = async (startDate: string, endDate: string) => {
   removeArr = [];
   Cookies.set("removeArr", "[]");
   myToast("Ausleihe erfolgreich erstellt!", "success");
+
+  queryClient.invalidateQueries({ queryKey: ["userLoans"] });
+  queryClient.invalidateQueries({ queryKey: ["allLoans"] });
+  queryClient.invalidateQueries({ queryKey: ["borrowableItems"] });
+
   return true;
 };

frontend/tailwind.config.js

@@ -1,5 +1,6 @@
 module.exports = {
   content: [
+    "./index.html",
     "./src/**/*.{js,jsx,ts,tsx}",
     // add other paths if needed
   ],