import React, { useState } from "react"; import Header from "./components/Header"; import LoginCard from "./components/LoginCard"; function App() { const [showLogin, setShowLogin] = useState(false); const handleLoginClick = () => setShowLogin(true); const handleCloseLogin = () => setShowLogin(false); const handleLoginSubmit = (username: string, password: string) => { // Hier kannst du fetch einbauen alert(`Login: ${username} / ${password}`); setShowLogin(false); }; return (