(() => {
  const $ = (s, r=document) => r.querySelector(s);
  const $$ = (s, r=document) => [...r.querySelectorAll(s)];

  // theme toggle (Bootstrap 5.3 data-bs-theme)
  (function themeBoot(){
    const saved = localStorage.getItem('nnai-theme');
    if(saved) document.documentElement.setAttribute('data-bs-theme', saved);
  })();
  $('#themeToggle')?.addEventListener('click', ()=>{
    const root = document.documentElement;
    const cur = root.getAttribute('data-bs-theme') || 'light';
    const next = cur === 'light' ? 'dark' : 'light';
    root.setAttribute('data-bs-theme', next);
    localStorage.setItem('nnai-theme', next);
  });

  // navbar scrolled shadow
  const nav = document.querySelector('.navbar');
  const toggle = () => nav?.classList.toggle('scrolled', window.scrollY > 50);
  toggle(); window.addEventListener('scroll', toggle, {passive:true});

  // portfolio filter + lightbox (on portfolio page)
  const grid = $('#portfolioGrid') || document;
  const buttons = $$('[data-filter]');
  const items = $$('.portfolio-item');
  buttons.forEach(btn=>{
    btn.addEventListener('click', ()=>{
      const f = btn.dataset.filter;
      items.forEach(card=>{
        const show = f==='*' || card.dataset.category===f;
        card.style.display = show ? '' : 'none';
        if(show) card.classList.add('animate-fade-in-up');
      });
    });
  });
  const modal = $('#portfolioModal'); const imgEl = $('#modalImage');
  if(modal && imgEl){
    modal.addEventListener('show.bs.modal', e=>{
      const trigger = e.relatedTarget;
      const src = trigger?.getAttribute('data-full') || trigger?.getAttribute('src') || '';
      imgEl.src = src;
    });
    modal.addEventListener('hidden.bs.modal', ()=> imgEl.src = '');
  }

  // form validation (contact page)
  const form = $('#contactForm'); const msg = $('#formMsg');
  form?.addEventListener('submit', e=>{
    e.preventDefault(); e.stopPropagation();
    if(form.checkValidity()){ msg.textContent='Thanks! We’ll reply soon.'; msg.className='small text-success'; form.reset(); form.classList.remove('was-validated'); }
    else { msg.textContent='Please fix the errors above.'; msg.className='small text-danger'; }
    form.classList.add('was-validated');
  });
})();