.botao-whatsapp-flutuante {
    position: fixed;
    right: max(18px, env(safe-area-inset-right, 0px));
    bottom: max(18px, env(safe-area-inset-bottom, 0px));
    z-index: 900;
    width: 58px;
    height: 58px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 3px solid var(--white);
    border-radius: 50%;
    background: #25d366;
    box-shadow: 0 12px 28px rgba(37, 211, 102, 0.26);
    overflow: hidden;
    line-height: 0;
    transition: transform 160ms var(--ease-out), box-shadow 180ms ease;
}
.botao-whatsapp-flutuante:active { transform: scale(0.96); }
.logo-whatsapp-flutuante { width: 100%; height: 100%; display: block; border-radius: 50%; object-fit: cover; }
@media (hover: hover) and (pointer: fine) {
    .botao-whatsapp-flutuante:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(37, 211, 102, 0.34); }
}
@media (max-width: 600px) { .botao-whatsapp-flutuante { width: 54px; height: 54px; } }