.invalid-feedback {
    display: block !important;
    width: 100%;
    color: #dc2626;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.25rem;
    line-height: 1.2;
}

.is-invalid {
    border-color: #dc3545 !important;
}

.is-invalid:focus {
    border-color: #dc3545 !important;
    box-shadow: 0 0 0 .15rem rgba(220, 53, 69, .15);
}