.btn-whatsapp {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
    padding: 10px 16px;
    font-weight: 800;
    border-radius: 12px;
    background: rgba(200, 200, 200, 0.2); /* gris con transparencia */
    color: #fff;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.1);
    transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}

.btn-whatsapp:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 28px rgba(255, 255, 255, 0.2);
    background: rgba(200, 200, 200, 0.3);
}