document.addEventListener("DOMContentLoaded", function () { const sections = ["sns", "ai", "b2b", "security"]; const navLinks = document.querySelectorAll("a.scroll-btn"); function onScroll() { const scrollY = window.scrollY + 160; // 헤더 보정 sections.forEach((id) => { const section = document.getElementById(id); if (!section) return; const sectionTop = section.offsetTop; const sectionHeight = section.offsetHeight; if (scrollY >= sectionTop && scrollY { link.classList.remove("active"); if (link.getAttribute("href") === "#" + id) { link.classList.add("active"); } }); } }); } window.addEventListener("scroll", onScroll); });