body {
    margin: 0;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #f4f6f8;
    color: #2c3e50;
}

a {
    text-decoration: none;
    color: white;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(90deg, #2c3e50, #34495e);
    padding: 12px 24px;
    color: white;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

nav .nav-left,
nav .nav-center,
nav .nav-right {
    display: flex;
    align-items: center;
}

nav .nav-center a {
    margin: 0 12px;
    font-weight: bold;
    opacity: 0.9;
}

nav .nav-center a:hover {
    opacity: 1;
    text-decoration: underline;
}

nav .login-btn {
    padding: 6px 14px;
    background-color: #1abc9c;
    border: none;
    border-radius: 6px;
    color: white;
    cursor: pointer;
    font-weight: bold;
}

nav .login-btn:hover {
    background-color: #16a085;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-align: center;
    padding: 30px;
}

main h1 {
    font-size: 2.4rem;
    margin-bottom: 16px;
}

main p {
    font-size: 1.1rem;
    max-width: 700px;
}

.status-box,
.ueber-aufbau {
    width: 600px;
    margin: 15px 0;
    padding: 20px;
    border-radius: 10px;
    background-color: #ffffff;
    border-left: 6px solid #1abc9c;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.login-form {
    background-color: #ffffff;
    padding: 32px 40px;
    border-radius: 10px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
    max-width: 400px;
    width: 100%;
}

.login-form h2 {
    margin-bottom: 20px;
    color: #2c3e50;
}

.login-form input[type="text"],
.login-form input[type="password"] {
    width: 100%;
    padding: 11px;
    margin-bottom: 16px;
    border: 1px solid #dcdcdc;
    border-radius: 6px;
    font-size: 1rem;
}

.login-form input[type="text"]:focus,
.login-form input[type="password"]:focus {
    outline: none;
    border-color: #1abc9c;
}

.login-form input[type="submit"] {
    width: 100%;
    padding: 11px;
    background-color: #1abc9c;
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    font-weight: bold;
}

.login-form input[type="submit"]:hover {
    background-color: #16a085;
}

li {
    list-style: none;
}

.fehlermeldung {
    display: flex; 
    justify-content: center; 
    align-items: center; 
    height: 60vh; 
    text-align: center;
}