微件:GFLMail

document.querySelectorAll('.gfl-item').forEach(item => {

 item.addEventListener('click', () => {
   const idx = item.getAttribute('data-gfl-index');
   const root = item.closest('.gfl-mail');
   if (!root) return;

   root.querySelectorAll('.gfl-detail').forEach(d => d.classList.remove('is-open'));

   const targetDetail = root.querySelector(`#gflDetail-${idx}`);
   if (!targetDetail) return;

   targetDetail.classList.add('is-open');
   root.classList.add('view-detail');

   const detailHeight = targetDetail.scrollHeight;
   if (detailHeight > 0) {
     root.style.height = detailHeight + 'px';
   }
 });

});

document.querySelectorAll('.gfl-back-btn').forEach(btn => {

 btn.addEventListener('click', () => {
   const root = btn.closest('.gfl-mail');
   if (!root) return;

   root.classList.remove('view-detail');
   root.querySelectorAll('.gfl-detail').forEach(d => d.classList.remove('is-open'));

   root.style.height = ;
 });

});