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John Doe
document.addEventListener("DOMContentLoaded", function() { const header = document.querySelector(".my-header"); // مطمئن شو که اول صفحه مخفیه header.classList.remove("active"); window.addEventListener("scroll", function() { if (window.scrollY > 10) { header.classList.add("active"); // اسکرول شد → ظاهر بشه } else { header.classList.remove("active"); // برگشت بالا → مخفی بشه } }); });