:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #ef4444;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: var(--card);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 420px;
}

h1 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    color: var(--primary);
    font-size: 1.75rem;
}

p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.btn-logout {
    background: var(--danger);
}

.user-badge {
    display: inline-block;
    background: #e0e7ff;
    color: var(--primary);
    padding: 0.4rem 1rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.alert-error {
    background-color: #fee2e2;
    color: #dc2626;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.25rem;
    border: 1px solid #fecaca;
    font-size: 0.9rem;
    text-align: center;
    /* Optional: Eine kleine Animation, damit der Fehler auffällt */
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}