document.addEventListener('DOMContentLoaded', function () {
    var quickLinks = document.querySelector('.quick-links');
    if (!quickLinks) return;

    // Last section: keyword cloud if present, otherwise last swiper section
    var lastSection = document.querySelector('.keyword-cloud');
    if (!lastSection) {
        var swiperSections = document.querySelectorAll('.swiper-section');
        lastSection = swiperSections[swiperSections.length - 1] || null;
    }
    if (!lastSection) return;

    var initialTop      = quickLinks.getBoundingClientRect().top + window.scrollY;
    var quickLinksHeight = quickLinks.offsetHeight;

    window.addEventListener('scroll', function () {
        var sectionBottom = lastSection.getBoundingClientRect().bottom;
        if (initialTop - sectionBottom > 0) {
            quickLinks.style.top = (initialTop - (initialTop - sectionBottom) - quickLinksHeight) + 'px';
        } else {
            quickLinks.style.top = initialTop + 'px';
        }
    });
});