input.error-input {
    border: 1px solid #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
    outline: none;
}

.error-message {
    color: #e74c3c;
    font-size: 0.9rem;
    margin-top: 4px;
    display: block;
}