/* WhatsApp Button */
.whatsapp-btn {
    position: fixed;
    bottom: 24px;
    right: 15px;
    width: 56px;
    height: 56px;
    z-index: 9999;
    opacity: 0;
    animation: fade-bounce .6s ease forwards;
    will-change: opacity, transform;
}
.whatsapp-btn a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    transition: transform .3s;
}
.whatsapp-btn a:hover {
    transform: scale(1.1);
}
.whatsapp-btn a:focus {
    outline: 3px solid #ffffff;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0,0,0,0.5);
}
.whatsapp-btn svg {
    width: 56px;
    height: 56px;
    animation: glow 1.5s ease-in-out infinite alternate;
}
@keyframes fade-bounce {
    0% {
        opacity: 0;
        transform: scale(.8);
    }
    60% {
        opacity: 1;
        transform: scale(1.1);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}
@keyframes glow {
    0% {
        filter: drop-shadow(0 0 0px rgba(37, 211, 102, 0));
    }
    100% {
        filter: drop-shadow(0 0 6px rgba(37, 211, 102, .8));
    }
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 100px;
    right: 24px;
    width: 40px;
    height: 40px;
    background: var(--oz-backtop-bg, #000000);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: opacity .4s, transform .2s;
    will-change: opacity, transform;
}
.back-to-top.visible {
    opacity: 0.6;
    pointer-events: auto;
    visibility: visible;
}
.back-to-top:hover {
    opacity: 1;
    transform: scale(1.1);
}
.back-to-top svg {
    width: 20px;
    height: 20px;
    fill: var(--oz-backtop-icon, #ffffff);
}

@media (max-width: 767px) {
    .whatsapp-btn { width: 48px; height: 48px; }
    .back-to-top { bottom: 80px; right: 16px; width: 36px; height: 36px; }
}