.botao-whatsapp {
    position: fixed; right: 20px; bottom: 20px; width: 54px; height: 54px; background: #25D366;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 6px 18px rgba(20, 32, 43, 0.28); z-index: 400; transition: transform 0.15s ease;
}
.botao-whatsapp:hover { transform: scale(1.06); }