:root { --brand: #0d6efd; --brand-dark: #0a58ca; }
body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--brand), var(--brand-dark));
}
.auth-card { width: 100%; max-width: 440px; border: none; border-radius: 1rem; }
.auth-brand { color: #fff; }