document.querySelectorAll('.accordion-trigger').forEach((btn) => {
    btn.addEventListener('click', function() {
        const section = btn.closest('.accordion-section');
        const expanded = btn.getAttribute('aria-expanded') === "true";
        document.querySelectorAll('.accordion-section').forEach(s => {
            if (s === section) {
                s.classList.toggle('open', !expanded);
                btn.setAttribute('aria-expanded', String(!expanded));
                const content = btn.nextElementSibling;
                content.style.maxHeight = !expanded ? (content.scrollHeight+40) + "px" : "0px";
            } else {
                s.classList.remove('open');
                s.querySelector('.accordion-trigger').setAttribute('aria-expanded', "false");
                s.querySelector('.accordion-content').style.maxHeight = "0px";
            }
        });
    });

    btn.addEventListener('keydown', function(e) {
        if (e.key === "ArrowDown" || e.key === "ArrowUp") {
            const triggers = Array.from(document.querySelectorAll('.accordion-trigger'));
            let idx = triggers.indexOf(e.target);
            if (e.key === "ArrowDown") idx = (idx + 1) % triggers.length;
            else idx = (idx - 1 + triggers.length) % triggers.length;
            triggers[idx].focus();
        }
    });
});