/* WhatsApp Floating Button */
#whatsapp-button {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
}
#whatsapp-button a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: #25D366;
    color: #fff;
    font-size: 28px;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(37,211,102,.5);
    transition: transform .2s, box-shadow .2s;
}
#whatsapp-button a:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 24px rgba(37,211,102,.6);
}
@media (max-width: 576px) {
    #whatsapp-button { bottom: 16px; right: 16px; }
}