document.addEventListener("DOMContentLoaded", () => {
    const header = document.querySelector(".site-header");

    if (header) {
        const updateHeader = () => {
            header.classList.toggle("is-scrolled", window.scrollY > 24);
        };

        updateHeader();
        window.addEventListener("scroll", updateHeader, { passive: true });
    }

    document.querySelectorAll("form[data-confirm]").forEach((form) => {
        form.addEventListener("submit", (event) => {
            if (!window.confirm(form.dataset.confirm)) {
                event.preventDefault();
            }
        });
    });
});