/* ── Floating WhatsApp Button ── */
.f4u-wa-btn {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 9999;

    display: flex;
    align-items: center;
    justify-content: center;

    width: 58px;
    height: 58px;
    background: #25d366;
    color: #fff;
    border-radius: 50%;
    box-shadow: 0 4px 18px rgba(37, 211, 102, .45);
    text-decoration: none;

    transition: transform .2s, box-shadow .2s;
    cursor: pointer;
}

.f4u-wa-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 24px rgba(37, 211, 102, .6);
    color: #fff;
}

/* Pulse ring */
.f4u-wa-btn::before {
    content: '';
    position: absolute;
    inset: -6px;
    border-radius: 50%;
    border: 3px solid rgba(37, 211, 102, .4);
    animation: f4u-wa-pulse 2.2s ease-out infinite;
}

@keyframes f4u-wa-pulse {
    0%   { transform: scale(1);   opacity: .7; }
    70%  { transform: scale(1.35); opacity: 0; }
    100% { transform: scale(1.35); opacity: 0; }
}

/* Tooltip */
.f4u-wa-tooltip {
    position: absolute;
    left: calc(100% + 12px);
    white-space: nowrap;
    background: #111;
    color: #fff;
    font-size: 13px;
    font-family: Arial, sans-serif;
    padding: 6px 12px;
    border-radius: 8px;
    opacity: 0;
    pointer-events: none;
    transform: translateX(-6px);
    transition: opacity .2s, transform .2s;
}

.f4u-wa-tooltip::after {
    content: '';
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    border: 6px solid transparent;
    border-right-color: #111;
}

.f4u-wa-btn:hover .f4u-wa-tooltip {
    opacity: 1;
    transform: translateX(0);
}

/* Mobile — smaller, no tooltip */
@media (max-width: 768px) {
    .f4u-wa-btn {
        width: 52px;
        height: 52px;
        bottom: 18px;
        left: 18px;
    }

    .f4u-wa-tooltip {
        display: none;
    }
}