.form {
    position: relative;
}

.form__fields {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr;
    grid-template-columns: 1fr;
    gap: 30rem;
}

.form__button[disabled] {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
    color: var(--color-primary-extra-light);
    cursor: not-allowed;
}

.form__button:not(:first-child) {
    margin-top: 30rem;
}

.form__alert {
    position: absolute;
    top: calc(100% + 12rem);
    left: 0;
    font-size: 12rem;
    line-height: 14rem;
    color: var(--color-gray-500);
    transition: visibility var(--transition-duration), opacity var(--transition-duration);
}

.form__alert:not(.active) {
    visibility: hidden;
    opacity: 0;
}

.form__alert strong {
    color: var(--color-dark);
}

@media screen and (min-width: 768px) {
    .form__fields {
        -ms-grid-columns: (1fr)[2];
        grid-template-columns: repeat(2, 1fr);
        row-gap: 40rem;
    }

    .form__checkbox {
        max-width: 414rem;
    }

    .form__fields .form__checkbox {
        grid-column: 1/-1;
    }

    .form__button:not(:first-child) {
        margin-top: 20rem;
    }

    .form__alert {
        top: calc(100% + 15rem);
    }
}