/* Estilo para desabilitar o botão com opacidade */
button.main_button.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

/* Spinner animado */
button.main_button.loading::before {
    content: "";
    width: 11px;
    height: 11px;
    border: 2px solid #fff;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
    margin-right: 8px;
    margin-bottom: 3px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}