(() => {
  const menuButton = document.querySelector('[data-menu-toggle]');
  const mobileNav = document.querySelector('[data-mobile-nav]');
  if (menuButton && mobileNav) {
    menuButton.addEventListener('click', () => {
      const open = mobileNav.classList.toggle('open');
      menuButton.classList.toggle('open', open);
      menuButton.setAttribute('aria-expanded', String(open));
    });
    mobileNav.querySelectorAll('a').forEach(a => a.addEventListener('click', () => {
      mobileNav.classList.remove('open'); menuButton.classList.remove('open');
      menuButton.setAttribute('aria-expanded', 'false');
    }));
  }

  const observer = 'IntersectionObserver' in window ? new IntersectionObserver(entries => {
    entries.forEach(entry => {
      if (entry.isIntersecting) { entry.target.classList.add('visible'); observer.unobserve(entry.target); }
    });
  }, {threshold: .12}) : null;
  document.querySelectorAll('.reveal-on-scroll').forEach(el => observer ? observer.observe(el) : el.classList.add('visible'));

  document.querySelectorAll('[data-mailto-form]').forEach(form => {
    form.addEventListener('submit', event => {
      event.preventDefault();
      if (!form.reportValidity()) return;
      const fd = new FormData(form);
      const lang = document.documentElement.lang || 'de';
      const lines = [];
      for (const [key, value] of fd.entries()) {
        if (key !== 'privacy' && key !== 'website') lines.push(`${key}: ${value}`);
      }
      const subject = lang === 'de' ? 'Anfrage über dilibworld.com' : 'Enquiry via dilibworld.com';
      const email = form.dataset.recipient || 'info@dilibworld.com';
      window.location.href = `mailto:${email}?subject=${encodeURIComponent(subject)}&body=${encodeURIComponent(lines.join('\n'))}`;
      const status = form.querySelector('.form-status');
      if (status) { status.style.display = 'block'; }
    });
  });

  const notice = document.querySelector('[data-cookie-notice]');
  const choice = localStorage.getItem('dilibworld-cookie-choice');
  if (notice && !choice) notice.classList.add('show');
  document.querySelectorAll('[data-cookie-choice]').forEach(btn => btn.addEventListener('click', () => {
    localStorage.setItem('dilibworld-cookie-choice', btn.dataset.cookieChoice);
    notice?.classList.remove('show');
  }));

  document.querySelectorAll('[data-current-year]').forEach(el => el.textContent = new Date().getFullYear());
})();