@media (max-width: 768px) {
  /* 宽度改为单列，侧栏压缩为折叠+标签式 */
  .products_sidebar, .news_sidebar { width: 100%; }

  .sidebar_section { border: 1px solid #e9eef5; border-radius: 10px; padding: .6rem .8rem; margin-bottom: .8rem; background: #fff; }
  .sidebar_title { display: flex; align-items: center; justify-content: space-between; font-size: 1.4rem; padding: .4rem 0; margin: 0; border: none; }
  .sidebar_toggle {width: 2.4rem;height: 2.4rem;border: none;background: transparent;color: #9aa4b2;font-size: 1.6rem;line-height: 1;cursor: pointer;display: none;}
  .sidebar_toggle::before { content: "▾"; display: inline-block; transition: transform .2s ease; }
  .sidebar_section.open .sidebar_toggle::before {transform: rotate(180deg);display: none;}

  .sidebar_menu { display: none; margin: 0; padding: .2rem 0 0; list-style: none; }
  .sidebar_section.open .sidebar_menu { display: flex; flex-wrap: wrap; gap: 6px 8px; }
  .sidebar_menu li { border: none; }
  .sidebar_menu a { display: inline-block; padding: .6rem .9rem; border: 1px solid #e8edf3; border-radius: 9999px; font-size: 1.3rem; color: #4a4a4a; text-decoration: none; background: #fff; }
  .sidebar_menu a.active { color: #1949AB; border-color: #1949AB33; background: #f3f6fd; }

  .sidebar_contact_list { display: none; }
  .sidebar_section.open .sidebar_contact_list { display: block; }
  .sidebar_contact_list li { padding: .8rem 0; border: none; }
  .sidebar_contact_list li * { font-size: 1.3rem; }
}