.whatsapp-float {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: #25D366;
    color: #fff;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    z-index: 9999;
    text-decoration: none;
    font-size: 28px;
}
.whatsapp-float svg { filter: drop-shadow(0 1px 2px rgba(0,0,0,0.1)); }