(function () {
  'use strict';

  const header = document.querySelector('.site-header');
  const menuToggle = document.querySelector('.menu-toggle');
  const navMobile = document.querySelector('.nav-mobile');

  if (header) {
    window.addEventListener('scroll', () => {
      header.classList.toggle('scrolled', window.scrollY > 20);
    }, { passive: true });
  }

  if (menuToggle && navMobile) {
    menuToggle.addEventListener('click', () => {
      const expanded = menuToggle.getAttribute('aria-expanded') === 'true';
      menuToggle.setAttribute('aria-expanded', String(!expanded));
      navMobile.classList.toggle('open');
      document.body.style.overflow = expanded ? '' : 'hidden';
    });

    navMobile.querySelectorAll('a').forEach((link) => {
      link.addEventListener('click', () => {
        menuToggle.setAttribute('aria-expanded', 'false');
        navMobile.classList.remove('open');
        document.body.style.overflow = '';
      });
    });
  }

  document.querySelectorAll('.faq-question').forEach((btn) => {
    btn.addEventListener('click', () => {
      const item = btn.closest('.faq-item');
      const isOpen = item.classList.contains('open');
      document.querySelectorAll('.faq-item.open').forEach((el) => el.classList.remove('open'));
      if (!isOpen) item.classList.add('open');
    });
  });

  const contactForm = document.getElementById('contact-form');
  if (contactForm) {
    contactForm.addEventListener('submit', (e) => {
      e.preventDefault();
      const formData = new FormData(contactForm);
      const name = formData.get('name');
      const email = formData.get('email');
      const subject = formData.get('interest') || 'Anfrage';
      const message = formData.get('message');
      const body = encodeURIComponent(
        `Name: ${name}\nE-Mail: ${email}\nTelefon: ${formData.get('phone') || '-'}\nUnternehmen: ${formData.get('company') || '-'}\n\n${message}`
      );
      window.location.href = `mailto:office@zisco.at?subject=${encodeURIComponent('Zisco: ' + subject)}&body=${body}`;
    });
  }
})();