.spinner {
    border: 2px solid transparent;
    border-top: 2px solid #0056f3;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 0.6s linear infinite;
    display: inline-block;
    margin-right: 8px;
    vertical-align: middle;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Esconde o spinner inicialmente */
.spinner.d-none {
    display: none;
}

/* Esconde o texto do botão enquanto carrega */
.btn.loading .btn-text {
    visibility: hidden;
}

/* Mostra o spinner */
.btn.loading .spinner {
    display: inline-block;
}

.btn.loading {
    cursor: not-allowed;
}