// Basic interactivity for portfolio
(function(){
  const html = document.documentElement;
  const themeToggle = document.getElementById('themeToggle');
  const navToggle = document.getElementById('navToggle');
  const navLinks = document.getElementById('navLinks');
  const yearEl = document.getElementById('year');
  const printBtn = document.getElementById('printBtn');

  // Initialize year
  if(yearEl){ yearEl.textContent = new Date().getFullYear(); }

  // Theme persistence
  const saved = localStorage.getItem('theme');
  if(saved === 'light') html.classList.add('light');

  function toggleTheme(){
    html.classList.toggle('light');
    localStorage.setItem('theme', html.classList.contains('light') ? 'light' : 'dark');
    themeToggle.textContent = html.classList.contains('light') ? '🌞' : '🌙';
  }

  if(themeToggle){
    themeToggle.addEventListener('click', toggleTheme);
    themeToggle.textContent = html.classList.contains('light') ? '🌞' : '🌙';
  }

  // Mobile nav
  if(navToggle){
    navToggle.addEventListener('click', ()=>{
      navLinks.classList.toggle('show');
    });
  }
  if(navLinks){
    navLinks.querySelectorAll('a').forEach(a=>{
      a.addEventListener('click', ()=> navLinks.classList.remove('show'));
    });
  }

  // Smooth scroll
  document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function (e) {
      const id = this.getAttribute('href');
      if(id.length > 1){
        e.preventDefault();
        document.querySelector(id)?.scrollIntoView({behavior:'smooth'});
      }
    });
  });

  // Print to PDF
  if(printBtn){
    printBtn.addEventListener('click', ()=> window.print());
  }

  // Fade-in sections on scroll
  const sections = document.querySelectorAll('.section');
  const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        entry.target.classList.add('visible');
      }
    });
  }, { threshold: 0.1 });

  sections.forEach(section => {
    observer.observe(section);
  });
})();