/* Buton WhatsApp flotant, pulsând. Migrat din mockup v6. */
.fab { position: fixed; right: 26px; bottom: 26px; z-index: 90; width: 62px; height: 62px; background: var(--wa); border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 10px 30px rgba(37, 211, 102, .45); transition: all .3s; animation: pulse 2.4s infinite; }
.fab:hover { transform: scale(1.08); }
.fab svg { width: 32px; height: 32px; fill: #fff; }
@keyframes pulse {
    0% { box-shadow: 0 10px 30px rgba(37, 211, 102, .45), 0 0 0 0 rgba(37, 211, 102, .5); }
    70% { box-shadow: 0 10px 30px rgba(37, 211, 102, .45), 0 0 0 16px rgba(37, 211, 102, 0); }
    100% { box-shadow: 0 10px 30px rgba(37, 211, 102, .45), 0 0 0 0 rgba(37, 211, 102, 0); }
}