diff --git a/internal_frontend/app/api/auth/[...nextauth]/route.ts b/internal_frontend/app/api/auth/[...nextauth]/route.ts
new file mode 100644
index 0000000..2652a29
--- /dev/null
+++ b/internal_frontend/app/api/auth/[...nextauth]/route.ts
@@ -0,0 +1,92 @@
+import NextAuth from "next-auth";
+import KeycloakProvider from "next-auth/providers/keycloak";
+import type {NextAuthOptions} from "next-auth";
+
+interface TypedJWT {
+    access_token?: string;
+    refresh_token?: string;
+
+    [key: string]: unknown;
+}
+
+const {
+    KEYCLOAK_CLIENT_ID,
+    KEYCLOAK_CLIENT_SECRET,
+    KEYCLOAK_ISSUER,
+    NEXTAUTH_SECRET,
+} = process.env;
+
+if (!KEYCLOAK_CLIENT_ID) throw new Error("Missing KEYCLOAK_CLIENT_ID");
+if (!KEYCLOAK_CLIENT_SECRET) throw new Error("Missing KEYCLOAK_CLIENT_SECRET");
+if (!KEYCLOAK_ISSUER) throw new Error("Missing KEYCLOAK_ISSUER");
+if (!NEXTAUTH_SECRET) throw new Error("Missing NEXTAUTH_SECRET");
+
+console.log("[auth] Using Keycloak provider:");
+console.log("  - Client ID:", KEYCLOAK_CLIENT_ID);
+console.log("  - Issuer:", KEYCLOAK_ISSUER);
+
+async function isTokenValid(token: string): Promise<boolean> {
+    try {
+        const res = await fetch(`${KEYCLOAK_ISSUER}/protocol/openid-connect/userinfo`, {
+            headers: {
+                Authorization: `Bearer ${token}`,
+            },
+        });
+
+        return res.ok;
+    } catch (error) {
+        console.error("[auth] Failed to validate access token:", error);
+        return false;
+    }
+}
+
+export const authOptions: NextAuthOptions = {
+    providers: [
+        KeycloakProvider({
+            clientId: KEYCLOAK_CLIENT_ID,
+            clientSecret: KEYCLOAK_CLIENT_SECRET,
+            issuer: KEYCLOAK_ISSUER,
+        }),
+    ],
+    secret: NEXTAUTH_SECRET,
+    session: {
+        strategy: "jwt",
+    },
+    callbacks: {
+        async jwt({token, account}) {
+            if (account) {
+                token.access_token = account.access_token;
+                token.refresh_token = account.refresh_token;
+                console.log("[auth] JWT callback: new login from Keycloak");
+                return token;
+            }
+
+            const {access_token} = token as TypedJWT;
+            if (access_token) {
+                const valid = await isTokenValid(access_token);
+                if (!valid) {
+                    console.warn("[auth] Access token invalid — clearing session");
+                    return {};
+                }
+            }
+
+            console.log("[auth] JWT callback: reusing existing token");
+            return token;
+        },
+
+        async session({session, token}) {
+            const {access_token, refresh_token} = token as TypedJWT;
+            console.log("[auth] Session callback: enriching session with tokens");
+            return {
+                ...session,
+                accessToken: access_token,
+                refreshToken: refresh_token,
+            };
+        },
+    },
+};
+
+console.log("[auth] NextAuth handler initialized");
+
+const handler = NextAuth(authOptions);
+export {handler as GET, handler as POST};
diff --git a/internal_frontend/app/layout.tsx b/internal_frontend/app/layout.tsx
index 865c33e..a999d9b 100644
--- a/internal_frontend/app/layout.tsx
+++ b/internal_frontend/app/layout.tsx
@@ -1,22 +1,27 @@
 import type {Metadata} from "next";
 import "./globals.css";
 import {ThemeProvider} from "@/components/theme-provider";
-import {SidebarInset, SidebarProvider, SidebarTrigger} from "@/components/ui/sidebar"
-import {AppSidebar} from "@/components/app-sidebar"
+import {SidebarInset, SidebarProvider, SidebarTrigger} from "@/components/ui/sidebar";
+import {AppSidebar} from "@/components/app-sidebar";
 import React from "react";
 import {Separator} from "@/components/ui/separator";
 import {DynamicBreadcrumb} from "@/components/dynamic-breadcrumb";
+import {getServerSession} from "next-auth";
+import {authOptions} from "@/app/api/auth/[...nextauth]/route";
+import LoginScreen from "@/components/login-screen";
 
 export const metadata: Metadata = {
     title: "Internal | Rhein Software",
     description: "Internal Tools for Rhein Software Development",
 };
 
-export default function RootLayout({
-                                       children,
-                                   }: Readonly<{
+export default async function RootLayout({
+                                             children,
+                                         }: Readonly<{
     children: React.ReactNode;
 }>) {
+    const session = await getServerSession(authOptions);
+
     return (
         <html lang="de" suppressHydrationWarning>
         <body>
@@ -26,34 +31,38 @@ export default function RootLayout({
             enableSystem
             disableTransitionOnChange
         >
-            <SidebarProvider
-                style={
-                    {
-                        "--sidebar-width": "calc(var(--spacing) * 72)",
-                        "--header-height": "calc(var(--spacing) * 12)",
-                    } as React.CSSProperties
-                }
-            >
-                <AppSidebar/>
-                <main>
-                    <SidebarInset>
-                        <header
-                            className="flex h-16 shrink-0 items-center gap-2 transition-[width,height] ease-linear group-has-data-[collapsible=icon]/sidebar-wrapper:h-12">
-                            <div className="flex items-center gap-2 px-4">
-                                <SidebarTrigger className="-ml-1"/>
-                                <Separator
-                                    orientation="vertical"
-                                    className="mr-2 data-[orientation=vertical]:h-4"
-                                />
-                                <DynamicBreadcrumb/>
-                            </div>
-                        </header>
-                    </SidebarInset>
-                    {children}
-                </main>
-            </SidebarProvider>
+            {session?.accessToken ? (
+                <SidebarProvider
+                    style={
+                        {
+                            "--sidebar-width": "calc(var(--spacing) * 72)",
+                            "--header-height": "calc(var(--spacing) * 12)",
+                        } as React.CSSProperties
+                    }
+                >
+                    <AppSidebar/>
+                    <main>
+                        <SidebarInset>
+                            <header
+                                className="flex h-16 shrink-0 items-center gap-2 transition-[width,height] ease-linear group-has-data-[collapsible=icon]/sidebar-wrapper:h-12">
+                                <div className="flex items-center gap-2 px-4">
+                                    <SidebarTrigger className="-ml-1"/>
+                                    <Separator
+                                        orientation="vertical"
+                                        className="mr-2 data-[orientation=vertical]:h-4"
+                                    />
+                                    <DynamicBreadcrumb/>
+                                </div>
+                            </header>
+                        </SidebarInset>
+                        {children}
+                    </main>
+                </SidebarProvider>
+            ) : (
+                <LoginScreen/>
+            )}
         </ThemeProvider>
         </body>
         </html>
     );
-}
\ No newline at end of file
+}
diff --git a/internal_frontend/components/login-screen.tsx b/internal_frontend/components/login-screen.tsx
new file mode 100644
index 0000000..8467ae4
--- /dev/null
+++ b/internal_frontend/components/login-screen.tsx
@@ -0,0 +1,22 @@
+'use client';
+
+import {useEffect} from "react";
+import {signIn} from "next-auth/react";
+import {Loader2} from "lucide-react"; // optional loading spinner
+import {cn} from "@/lib/utils"; // optional: your className utility
+
+export default function LoginScreen() {
+    useEffect(() => {
+        // Immediately redirect to Keycloak
+        signIn("keycloak");
+    }, []);
+
+    return (
+        <div className="flex min-h-screen items-center justify-center bg-muted">
+            <div className="flex flex-col items-center gap-2 text-center">
+                <Loader2 className={cn("h-6 w-6 animate-spin text-muted-foreground")}/>
+                <p className="text-sm text-muted-foreground">Leite zur Anmeldung weiter ...</p>
+            </div>
+        </div>
+    );
+}
diff --git a/internal_frontend/components/ui/card.tsx b/internal_frontend/components/ui/card.tsx
new file mode 100644
index 0000000..d05bbc6
--- /dev/null
+++ b/internal_frontend/components/ui/card.tsx
@@ -0,0 +1,92 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+function Card({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card"
+      className={cn(
+        "bg-card text-card-foreground flex flex-col gap-6 rounded-xl border py-6 shadow-sm",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-header"
+      className={cn(
+        "@container/card-header grid auto-rows-min grid-rows-[auto_auto] items-start gap-1.5 px-6 has-data-[slot=card-action]:grid-cols-[1fr_auto] [.border-b]:pb-6",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-title"
+      className={cn("leading-none font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function CardDescription({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-description"
+      className={cn("text-muted-foreground text-sm", className)}
+      {...props}
+    />
+  )
+}
+
+function CardAction({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-action"
+      className={cn(
+        "col-start-2 row-span-2 row-start-1 self-start justify-self-end",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardContent({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-content"
+      className={cn("px-6", className)}
+      {...props}
+    />
+  )
+}
+
+function CardFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-footer"
+      className={cn("flex items-center px-6 [.border-t]:pt-6", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Card,
+  CardHeader,
+  CardFooter,
+  CardTitle,
+  CardAction,
+  CardDescription,
+  CardContent,
+}
diff --git a/internal_frontend/components/ui/input-otp.tsx b/internal_frontend/components/ui/input-otp.tsx
new file mode 100644
index 0000000..614f70e
--- /dev/null
+++ b/internal_frontend/components/ui/input-otp.tsx
@@ -0,0 +1,77 @@
+"use client"
+
+import * as React from "react"
+import { OTPInput, OTPInputContext } from "input-otp"
+import { MinusIcon } from "lucide-react"
+
+import { cn } from "@/lib/utils"
+
+function InputOTP({
+  className,
+  containerClassName,
+  ...props
+}: React.ComponentProps<typeof OTPInput> & {
+  containerClassName?: string
+}) {
+  return (
+    <OTPInput
+      data-slot="input-otp"
+      containerClassName={cn(
+        "flex items-center gap-2 has-disabled:opacity-50",
+        containerClassName
+      )}
+      className={cn("disabled:cursor-not-allowed", className)}
+      {...props}
+    />
+  )
+}
+
+function InputOTPGroup({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="input-otp-group"
+      className={cn("flex items-center", className)}
+      {...props}
+    />
+  )
+}
+
+function InputOTPSlot({
+  index,
+  className,
+  ...props
+}: React.ComponentProps<"div"> & {
+  index: number
+}) {
+  const inputOTPContext = React.useContext(OTPInputContext)
+  const { char, hasFakeCaret, isActive } = inputOTPContext?.slots[index] ?? {}
+
+  return (
+    <div
+      data-slot="input-otp-slot"
+      data-active={isActive}
+      className={cn(
+        "data-[active=true]:border-ring data-[active=true]:ring-ring/50 data-[active=true]:aria-invalid:ring-destructive/20 dark:data-[active=true]:aria-invalid:ring-destructive/40 aria-invalid:border-destructive data-[active=true]:aria-invalid:border-destructive dark:bg-input/30 border-input relative flex h-9 w-9 items-center justify-center border-y border-r text-sm shadow-xs transition-all outline-none first:rounded-l-md first:border-l last:rounded-r-md data-[active=true]:z-10 data-[active=true]:ring-[3px]",
+        className
+      )}
+      {...props}
+    >
+      {char}
+      {hasFakeCaret && (
+        <div className="pointer-events-none absolute inset-0 flex items-center justify-center">
+          <div className="animate-caret-blink bg-foreground h-4 w-px duration-1000" />
+        </div>
+      )}
+    </div>
+  )
+}
+
+function InputOTPSeparator({ ...props }: React.ComponentProps<"div">) {
+  return (
+    <div data-slot="input-otp-separator" role="separator" {...props}>
+      <MinusIcon />
+    </div>
+  )
+}
+
+export { InputOTP, InputOTPGroup, InputOTPSlot, InputOTPSeparator }
diff --git a/internal_frontend/package-lock.json b/internal_frontend/package-lock.json
index 62214c2..059d448 100644
--- a/internal_frontend/package-lock.json
+++ b/internal_frontend/package-lock.json
@@ -16,8 +16,13 @@
         "@radix-ui/react-tooltip": "^1.2.7",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
+        "framer-motion": "^12.22.0",
+        "input-otp": "^1.4.2",
+        "jsonwebtoken": "^9.0.2",
+        "jwt-decode": "^4.0.0",
         "lucide-react": "^0.525.0",
         "next": "15.3.4",
+        "next-auth": "^4.24.11",
         "next-themes": "^0.4.6",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
@@ -26,6 +31,7 @@
       "devDependencies": {
         "@eslint/eslintrc": "^3",
         "@tailwindcss/postcss": "^4",
+        "@types/jsonwebtoken": "^9.0.10",
         "@types/node": "^20",
         "@types/react": "^19",
         "@types/react-dom": "^19",
@@ -63,6 +69,15 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/@babel/runtime": {
+      "version": "7.27.6",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.27.6.tgz",
+      "integrity": "sha512-vbavdySgbTTrmFE+EsiqUTzlOr5bzlnJtUv9PynGCAKvfQqjIXbvFdumPM/GxMDfyuGMJaJAU6TO4zc1Jf1i8Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.4.3.tgz",
@@ -1007,6 +1022,15 @@
         "node": ">=12.4.0"
       }
     },
+    "node_modules/@panva/hkdf": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@panva/hkdf/-/hkdf-1.2.1.tgz",
+      "integrity": "sha512-6oclG6Y3PiDFcoyk8srjLfVKyMfVCKJ27JwNPViuXziFpmdz+MZnZN/aKY0JGXgYuO/VghU0jcOAZgWXZ1Dmrw==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/panva"
+      }
+    },
     "node_modules/@radix-ui/primitive": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@radix-ui/primitive/-/primitive-1.1.2.tgz",
@@ -2023,6 +2047,24 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/jsonwebtoken": {
+      "version": "9.0.10",
+      "resolved": "https://registry.npmjs.org/@types/jsonwebtoken/-/jsonwebtoken-9.0.10.tgz",
+      "integrity": "sha512-asx5hIG9Qmf/1oStypjanR7iKTv0gXQ1Ov/jfrX6kS/EO0OFni8orbmGCn0672NHR3kXHwpAwR+B368ZGN/2rA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/ms": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/ms": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@types/ms/-/ms-2.1.0.tgz",
+      "integrity": "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "20.19.2",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-20.19.2.tgz",
@@ -2938,6 +2980,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/buffer-equal-constant-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
+      "integrity": "sha512-zRpUiDwd/xk6ADqPMATG8vc9VPrkck7T07OIx0gnjmJAnHnTVXNQG3vfvWNuiZIkwu9KrKdA1iJKfsfTVxE6NA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/busboy": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/busboy/-/busboy-1.6.0.tgz",
@@ -3135,6 +3183,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/cookie": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
+      "integrity": "sha512-yki5XnKuf750l50uGTllt6kKILY4nQ1eNIQatoXEByZ5dWgnKqbnqmTrBE5B4N7lrMJKQ2ytWMiTO2o0v6Ew/w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -3323,6 +3380,15 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/ecdsa-sig-formatter": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz",
+      "integrity": "sha512-nagl3RYrbNv6kQkeJIpt6NJZy8twLB/2vtz6yN9Z4vRKHN4/QZJIEbqohALSgwKdnksuY3k5Addp5lg8sVoVcQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "node_modules/emoji-regex": {
       "version": "9.2.2",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
@@ -4101,6 +4167,33 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/framer-motion": {
+      "version": "12.22.0",
+      "resolved": "https://registry.npmjs.org/framer-motion/-/framer-motion-12.22.0.tgz",
+      "integrity": "sha512-qG07rR8/mboCNU34nORbrIbBXbJzP4aDqBdr67TAIVlMryDEOwh7LXjylWovlnPCMg78ExoY0Gn2F1fV+3DNIw==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-dom": "^12.22.0",
+        "motion-utils": "^12.19.0",
+        "tslib": "^2.4.0"
+      },
+      "peerDependencies": {
+        "@emotion/is-prop-valid": "*",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@emotion/is-prop-valid": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/function-bind": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
@@ -4422,6 +4515,16 @@
         "node": ">=0.8.19"
       }
     },
+    "node_modules/input-otp": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/input-otp/-/input-otp-1.4.2.tgz",
+      "integrity": "sha512-l3jWwYNvrEa6NTCt7BECfCm48GvwuZzkoeG3gBL2w4CHeOXW3eKFmf9UNYkNfYc3mxMrthMnxjIE07MT0zLBQA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^16.8 || ^17.0 || ^18.0 || ^19.0.0 || ^19.0.0-rc",
+        "react-dom": "^16.8 || ^17.0 || ^18.0 || ^19.0.0 || ^19.0.0-rc"
+      }
+    },
     "node_modules/internal-slot": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/internal-slot/-/internal-slot-1.1.0.tgz",
@@ -4887,6 +4990,15 @@
         "jiti": "lib/jiti-cli.mjs"
       }
     },
+    "node_modules/jose": {
+      "version": "4.15.9",
+      "resolved": "https://registry.npmjs.org/jose/-/jose-4.15.9.tgz",
+      "integrity": "sha512-1vUQX+IdDMVPj4k8kOxgUqlcK518yluMuGZwqlr44FS1ppZB/5GWh4rZG89erpOBOJjU/OBsnCVFfapsRz6nEA==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/panva"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -4941,6 +5053,28 @@
         "json5": "lib/cli.js"
       }
     },
+    "node_modules/jsonwebtoken": {
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/jsonwebtoken/-/jsonwebtoken-9.0.2.tgz",
+      "integrity": "sha512-PRp66vJ865SSqOlgqS8hujT5U4AOgMfhrwYIuIhfKaoSCZcirrmASQr8CX7cUg+RMih+hgznrjp99o+W4pJLHQ==",
+      "license": "MIT",
+      "dependencies": {
+        "jws": "^3.2.2",
+        "lodash.includes": "^4.3.0",
+        "lodash.isboolean": "^3.0.3",
+        "lodash.isinteger": "^4.0.4",
+        "lodash.isnumber": "^3.0.3",
+        "lodash.isplainobject": "^4.0.6",
+        "lodash.isstring": "^4.0.1",
+        "lodash.once": "^4.0.0",
+        "ms": "^2.1.1",
+        "semver": "^7.5.4"
+      },
+      "engines": {
+        "node": ">=12",
+        "npm": ">=6"
+      }
+    },
     "node_modules/jsx-ast-utils": {
       "version": "3.3.5",
       "resolved": "https://registry.npmjs.org/jsx-ast-utils/-/jsx-ast-utils-3.3.5.tgz",
@@ -4957,6 +5091,36 @@
         "node": ">=4.0"
       }
     },
+    "node_modules/jwa": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/jwa/-/jwa-1.4.2.tgz",
+      "integrity": "sha512-eeH5JO+21J78qMvTIDdBXidBd6nG2kZjg5Ohz/1fpa28Z4CcsWUzJ1ZZyFq/3z3N17aZy+ZuBoHljASbL1WfOw==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer-equal-constant-time": "^1.0.1",
+        "ecdsa-sig-formatter": "1.0.11",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "node_modules/jws": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/jws/-/jws-3.2.2.tgz",
+      "integrity": "sha512-YHlZCB6lMTllWDtSPHz/ZXTsi8S00usEV6v1tjq8tOUZzw7DpSDWVXjXDre6ed1w/pd495ODpHZYSdkRTsa0HA==",
+      "license": "MIT",
+      "dependencies": {
+        "jwa": "^1.4.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "node_modules/jwt-decode": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jwt-decode/-/jwt-decode-4.0.0.tgz",
+      "integrity": "sha512-+KJGIyHgkGuIq3IEBNftfhW/LfWhXUIY6OmyVWjliu5KH1y0fw7VQ8YndE2O4qZdMSd9SqbnC8GOcZEy0Om7sA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/keyv": {
       "version": "4.5.4",
       "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
@@ -5256,6 +5420,42 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/lodash.includes": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/lodash.includes/-/lodash.includes-4.3.0.tgz",
+      "integrity": "sha512-W3Bx6mdkRTGtlJISOvVD/lbqjTlPPUDTMnlXZFnVwi9NKJ6tiAk6LVdlhZMm17VZisqhKcgzpO5Wz91PCt5b0w==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isboolean": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/lodash.isboolean/-/lodash.isboolean-3.0.3.tgz",
+      "integrity": "sha512-Bz5mupy2SVbPHURB98VAcw+aHh4vRV5IPNhILUCsOzRmsTmSQ17jIuqopAentWoehktxGd9e/hbIXq980/1QJg==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isinteger": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/lodash.isinteger/-/lodash.isinteger-4.0.4.tgz",
+      "integrity": "sha512-DBwtEWN2caHQ9/imiNeEA5ys1JoRtRfY3d7V9wkqtbycnAmTvRRmbHKDV4a0EYc678/dia0jrte4tjYwVBaZUA==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isnumber": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/lodash.isnumber/-/lodash.isnumber-3.0.3.tgz",
+      "integrity": "sha512-QYqzpfwO3/CWf3XP+Z+tkQsfaLL/EnUlXWVkIk5FUPc4sBdTehEqZONuyRt2P67PXAk+NXmTBcc97zw9t1FQrw==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isplainobject": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz",
+      "integrity": "sha512-oSXzaWypCMHkPC3NvBEaPHf0KsA5mvPrOPgQWDsbg8n7orZ290M0BmC/jgRZ4vcJ6DTAhjrsSYgdsW/F+MFOBA==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isstring": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
+      "integrity": "sha512-0wJxfxH1wgO3GrbuP+dTTk7op+6L41QCXbGINEmD+ny/G/eCqGzxyCsh7159S+mgDDcoarnBw6PC1PS5+wUGgw==",
+      "license": "MIT"
+    },
     "node_modules/lodash.merge": {
       "version": "4.6.2",
       "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
@@ -5263,6 +5463,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/lodash.once": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
+      "integrity": "sha512-Sb487aTOCr9drQVL8pIxOzVhafOjZN9UU54hiN8PU3uAiSV7lx1yYNpbNmex2PK6dSJoNTSJUUswT651yww3Mg==",
+      "license": "MIT"
+    },
     "node_modules/loose-envify": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
@@ -5276,6 +5482,24 @@
         "loose-envify": "cli.js"
       }
     },
+    "node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "license": "ISC",
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/lru-cache/node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "license": "ISC"
+    },
     "node_modules/lucide-react": {
       "version": "0.525.0",
       "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-0.525.0.tgz",
@@ -5391,11 +5615,25 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/motion-dom": {
+      "version": "12.22.0",
+      "resolved": "https://registry.npmjs.org/motion-dom/-/motion-dom-12.22.0.tgz",
+      "integrity": "sha512-ooH7+/BPw9gOsL9VtPhEJHE2m4ltnhMlcGMhEqA0YGNhKof7jdaszvsyThXI6LVIKshJUZ9/CP6HNqQhJfV7kw==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-utils": "^12.19.0"
+      }
+    },
+    "node_modules/motion-utils": {
+      "version": "12.19.0",
+      "resolved": "https://registry.npmjs.org/motion-utils/-/motion-utils-12.19.0.tgz",
+      "integrity": "sha512-BuFTHINYmV07pdWs6lj6aI63vr2N4dg0vR+td0rtrdpWOhBzIkEklZyLcvKBoEtwSqx8Jg06vUB5RS0xDiUybw==",
+      "license": "MIT"
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
       "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/nanoid": {
@@ -5493,6 +5731,38 @@
         }
       }
     },
+    "node_modules/next-auth": {
+      "version": "4.24.11",
+      "resolved": "https://registry.npmjs.org/next-auth/-/next-auth-4.24.11.tgz",
+      "integrity": "sha512-pCFXzIDQX7xmHFs4KVH4luCjaCbuPRtZ9oBUjUhOk84mZ9WVPf94n87TxYI4rSRf9HmfHEF8Yep3JrYDVOo3Cw==",
+      "license": "ISC",
+      "dependencies": {
+        "@babel/runtime": "^7.20.13",
+        "@panva/hkdf": "^1.0.2",
+        "cookie": "^0.7.0",
+        "jose": "^4.15.5",
+        "oauth": "^0.9.15",
+        "openid-client": "^5.4.0",
+        "preact": "^10.6.3",
+        "preact-render-to-string": "^5.1.19",
+        "uuid": "^8.3.2"
+      },
+      "peerDependencies": {
+        "@auth/core": "0.34.2",
+        "next": "^12.2.5 || ^13 || ^14 || ^15",
+        "nodemailer": "^6.6.5",
+        "react": "^17.0.2 || ^18 || ^19",
+        "react-dom": "^17.0.2 || ^18 || ^19"
+      },
+      "peerDependenciesMeta": {
+        "@auth/core": {
+          "optional": true
+        },
+        "nodemailer": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/next-themes": {
       "version": "0.4.6",
       "resolved": "https://registry.npmjs.org/next-themes/-/next-themes-0.4.6.tgz",
@@ -5531,6 +5801,12 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/oauth": {
+      "version": "0.9.15",
+      "resolved": "https://registry.npmjs.org/oauth/-/oauth-0.9.15.tgz",
+      "integrity": "sha512-a5ERWK1kh38ExDEfoO6qUHJb32rd7aYmPHuyCu3Fta/cnICvYmgd2uhuKXvPD+PXB+gCEYYEaQdIRAjCOwAKNA==",
+      "license": "MIT"
+    },
     "node_modules/object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -5541,6 +5817,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/object-hash": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/object-hash/-/object-hash-2.2.0.tgz",
+      "integrity": "sha512-gScRMn0bS5fH+IuwyIFgnh9zBdo4DV+6GhygmWM9HyNJSgS0hScp1f5vjtm7oIIOiT9trXrShAkLFSc2IqKNgw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/object-inspect": {
       "version": "1.13.4",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.4.tgz",
@@ -5654,6 +5939,30 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/oidc-token-hash": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/oidc-token-hash/-/oidc-token-hash-5.1.0.tgz",
+      "integrity": "sha512-y0W+X7Ppo7oZX6eovsRkuzcSM40Bicg2JEJkDJ4irIt1wsYAP5MLSNv+QAogO8xivMffw/9OvV3um1pxXgt1uA==",
+      "license": "MIT",
+      "engines": {
+        "node": "^10.13.0 || >=12.0.0"
+      }
+    },
+    "node_modules/openid-client": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/openid-client/-/openid-client-5.7.1.tgz",
+      "integrity": "sha512-jDBPgSVfTnkIh71Hg9pRvtJc6wTwqjRkN88+gCFtYWrlP4Yx2Dsrow8uPi3qLr/aeymPF3o2+dS+wOpglK04ew==",
+      "license": "MIT",
+      "dependencies": {
+        "jose": "^4.15.9",
+        "lru-cache": "^6.0.0",
+        "object-hash": "^2.2.0",
+        "oidc-token-hash": "^5.0.3"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/panva"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
@@ -5820,6 +6129,28 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/preact": {
+      "version": "10.26.9",
+      "resolved": "https://registry.npmjs.org/preact/-/preact-10.26.9.tgz",
+      "integrity": "sha512-SSjF9vcnF27mJK1XyFMNJzFd5u3pQiATFqoaDy03XuN00u4ziveVVEGt5RKJrDR8MHE/wJo9Nnad56RLzS2RMA==",
+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/preact"
+      }
+    },
+    "node_modules/preact-render-to-string": {
+      "version": "5.2.6",
+      "resolved": "https://registry.npmjs.org/preact-render-to-string/-/preact-render-to-string-5.2.6.tgz",
+      "integrity": "sha512-JyhErpYOvBV1hEPwIxc/fHWXPfnEGdRKxc8gFdAZ7XV4tlzyzG847XAyEZqoDnynP88akM4eaHcSOzNcLWFguw==",
+      "license": "MIT",
+      "dependencies": {
+        "pretty-format": "^3.8.0"
+      },
+      "peerDependencies": {
+        "preact": ">=10"
+      }
+    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -5830,6 +6161,12 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/pretty-format": {
+      "version": "3.8.0",
+      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-3.8.0.tgz",
+      "integrity": "sha512-WuxUnVtlWL1OfZFQFuqvnvs6MiAGk9UNsBostyBOB0Is9wb5uRESevA6rnl/rkksXaGX3GzZhPup5d6Vp1nFew==",
+      "license": "MIT"
+    },
     "node_modules/prop-types": {
       "version": "15.8.1",
       "resolved": "https://registry.npmjs.org/prop-types/-/prop-types-15.8.1.tgz",
@@ -6110,6 +6447,26 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/safe-push-apply": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/safe-push-apply/-/safe-push-apply-1.0.0.tgz",
@@ -6155,7 +6512,6 @@
       "version": "7.7.2",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
       "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
-      "devOptional": true,
       "license": "ISC",
       "bin": {
         "semver": "bin/semver.js"
@@ -6951,6 +7307,15 @@
         }
       }
     },
+    "node_modules/uuid": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
diff --git a/internal_frontend/package.json b/internal_frontend/package.json
index eae417d..4b4ec2c 100644
--- a/internal_frontend/package.json
+++ b/internal_frontend/package.json
@@ -17,8 +17,13 @@
     "@radix-ui/react-tooltip": "^1.2.7",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "framer-motion": "^12.22.0",
+    "input-otp": "^1.4.2",
+    "jsonwebtoken": "^9.0.2",
+    "jwt-decode": "^4.0.0",
     "lucide-react": "^0.525.0",
     "next": "15.3.4",
+    "next-auth": "^4.24.11",
     "next-themes": "^0.4.6",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
diff --git a/internal_frontend/tsconfig.json b/internal_frontend/tsconfig.json
index d8b9323..dd19d06 100644
--- a/internal_frontend/tsconfig.json
+++ b/internal_frontend/tsconfig.json
@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "ES2017",
-    "lib": ["dom", "dom.iterable", "esnext"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
@@ -19,9 +23,19 @@
       }
     ],
     "paths": {
-      "@/*": ["./*"]
+      "@/*": [
+        "./*"
+      ]
     }
   },
-  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
-  "exclude": ["node_modules"]
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    "types"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
 }
diff --git a/internal_frontend/types/auth.d.ts b/internal_frontend/types/auth.d.ts
new file mode 100644
index 0000000..5e1c88a
--- /dev/null
+++ b/internal_frontend/types/auth.d.ts
@@ -0,0 +1,16 @@
+import NextAuth from "next-auth";
+import {JWT} from "next-auth/jwt";
+
+declare module "next-auth/jwt" {
+    interface JWT {
+        access_token?: string;
+        refresh_token?: string;
+    }
+}
+
+declare module "next-auth" {
+    interface Session {
+        accessToken?: string;
+        refreshToken?: string;
+    }
+}