/* Estilos para efeito de loading nos botões */
.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading .loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.2);
    border-radius: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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