.whatsapp-button {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 60px;
    height: 60px;
    background-color: #25D366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    z-index: 9999;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8);
    cursor: pointer;
}

.whatsapp-button.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.whatsapp-button:hover {
    background-color: #20BA5A;
    box-shadow: 0 6px 16px rgba(37, 211, 102, 0.6);
    transform: scale(1.1);
}

.whatsapp-button svg {
    width: 32px;
    height: 32px;
    color: #ffffff;
}

@media (max-width: 768px) {
    .whatsapp-button {
        width: 56px;
        height: 56px;
        bottom: 15px;
        left: 15px;
    }
    
    .whatsapp-button svg {
        width: 28px;
        height: 28px;
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}