function toggleArticle(btn) {
    const article = btn.closest('.article');
    const body = article.querySelector('.article-body');
    const isOpen = body.style.display === 'block';

    body.style.display = isOpen ? 'none' : 'block';
    btn.classList.toggle('open', !isOpen);
    btn.innerHTML = isOpen
      ? 'Lire <span class="toggle-arrow">›</span>'
      : 'Fermer <span class="toggle-arrow">›</span>';
  }