body { grid-template-columns: 1fr; }
    #contenido_principal { grid-column: 1; }

    .auth-contenedor {
        max-width: 420px;
        margin: 3rem auto;
        padding: 0 1rem;
    }
    .auth-caja {
        border: 1px solid var(--che_commerce-gris-suave);
        padding: 2rem;
    }
    .auth-titulo { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.25rem; color: var(--demente-rojo); }
    .auth-subtitulo { font-size: 0.875rem; color: var(--che_commerce-gris-oscuro); margin-bottom: 1.75rem; margin-top: 10px; line-height: 1.6;}
    .auth-form { display: flex; flex-direction: column; gap: 1rem; }
    .auth-campo { display: flex; flex-direction: column; gap: 0.25rem; }
    .auth-campo label { font-size: 0.875rem; font-weight: 500; margin-bottom: 0; }
    .auth-campo .auth-opcional { font-weight: 400; color: var(--che_commerce-gris-medio); font-size: 0.8rem; }
    .auth-error {
        background: var(--che_commerce-error-fondo, #fee2e2);
        color: var(--che_commerce-error, #dc2626);
        padding: 0.6rem 0.75rem;
        font-size: 0.875rem;
        border-left: 3px solid var(--che_commerce-error, #dc2626);
        margin-bottom: 0.5rem;
    }
    .auth-pie { text-align: center; margin-top: 1.25rem; font-size: 0.875rem; color: var(--che_commerce-gris-oscuro); }
    .auth-pie a { color: var(--che_commerce-frente); font-weight: 500; }
    .auth-form .boton--primario {
        background: var(--demente-rojo);
        border-color: var(--demente-rojo);
        color: var(--demente-blanco);
        border-radius: 4px;
        font-family: 'Inclusive Sans', sans-serif;
        font-size: 0.9rem;
        font-weight: 700;
        letter-spacing: 0.1em;
        text-transform: uppercase;
        width: 100%;
        padding: 0.75rem;
    }

    .auth-form .boton--primario:hover {
        background: var(--demente-negro);
        border-color: var(--demente-negro);
    }