.whatsapp-float {
    position: fixed;
    right: 20px;
    bottom: 20%;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #25D366, #1fb855);
    color: #fff;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, .85);
    box-shadow: 0 16px 34px rgba(120, 200, 65, .36);
    transition: .25s ease;
}

.whatsapp-float:hover {
    transform: scale(1.08);
    box-shadow: 0 18px 40px rgba(120, 200, 65, .46);
}

.whatsapp-float:focus-visible {
    outline: 2px solid var(--purple, #7c2d6f);
    outline-offset: 3px;
}

.whatsapp-float__pulse {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: var(--green, #78c841);
    animation: waPulseRing 2.2s cubic-bezier(.4, 0, .6, 1) infinite;
    z-index: -1;
    pointer-events: none;
}

.whatsapp-float i {
    font-size: 32px;
    animation: waIconBounce 3s ease-in-out infinite;
}

@keyframes waPulseRing {
    0% { transform: scale(1); opacity: .45; }
    70%, 100% { transform: scale(1.5); opacity: 0; }
}

@keyframes waIconBounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@media (max-width: 640px) {
    .whatsapp-float {
        right: 14px;
        width: 54px;
        height: 54px;
    }

    .whatsapp-float i {
        font-size: 28px;
    }
}