.is-invalid {
    border: 1px solid #dc3545 !important;
    background-color: #f8d7da;
    color: #721c24;
    outline: none;
}

.is-invalid:focus {
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.invalid-feedback {
    color: #dc3545;
    font-size: 0.875em;
    margin-top: 0.25rem;
    display: block;
}

.is-success {
    border: 1px solid #28a745 !important;
    background-color: #d4edda;
    color: #155724;
    outline: none;
}

.is-success:focus {
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

.valid-feedback {
    color: #28a745;
    font-size: 0.875em;
    margin-top: 0.25rem;
    display: block;
}