/* WhatsApp floating button — refined */
.whatsapp-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 1500;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #25D366;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    box-shadow:
        0 0 0 0 rgba(37, 211, 102, 0.4),
        0 12px 28px -8px rgba(37, 211, 102, 0.55),
        0 4px 12px rgba(10, 19, 42, 0.18);
    text-align: center;
    color: #fff;
    font-size: 24px;
    transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), background-color 0.4s var(--ease);
    animation: wpp-pulse 2.6s var(--ease) infinite;
}

@keyframes wpp-pulse {
    0%, 100% {
        box-shadow:
            0 0 0 0 rgba(37, 211, 102, 0.35),
            0 12px 28px -8px rgba(37, 211, 102, 0.55),
            0 4px 12px rgba(10, 19, 42, 0.18);
    }
    50% {
        box-shadow:
            0 0 0 14px rgba(37, 211, 102, 0),
            0 12px 28px -8px rgba(37, 211, 102, 0.55),
            0 4px 12px rgba(10, 19, 42, 0.18);
    }
}

.whatsapp-btn img {
    width: 30px;
    height: auto;
}

.whatsapp-btn:hover {
    background-color: #128C7E;
    transform: translateY(-3px) scale(1.04);
}

@media (max-width: 768px) {
    .whatsapp-btn {
        bottom: 20px;
        right: 20px;
        width: 54px;
        height: 54px;
    }

    .whatsapp-btn img {
        width: 26px;
    }
}