(function () {
  'use strict';

  var nav = document.getElementById('nav');
  var navToggle = document.getElementById('navToggle');
  var navMobile = document.getElementById('navMobile');

  /* Navigation scroll effect */
  if (nav) {
    var scrolled = false;
    window.addEventListener(
      'scroll',
      function () {
        var shouldScroll = window.scrollY > 100;
        if (shouldScroll === scrolled) return;
        scrolled = shouldScroll;
        nav.classList.toggle('scrolled', scrolled);
      },
      { passive: true }
    );
  }

  /* Mobile menu */
  if (navToggle && navMobile) {
    navToggle.addEventListener('click', function () {
      var isOpen = navMobile.classList.toggle('active');
      navToggle.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
    });

    navMobile.querySelectorAll('a').forEach(function (link) {
      link.addEventListener('click', function () {
        navMobile.classList.remove('active');
        navToggle.setAttribute('aria-expanded', 'false');
      });
    });
  }

  /* Scroll reveal via IntersectionObserver */
  var reveals = document.querySelectorAll('.reveal');
  if (reveals.length && 'IntersectionObserver' in window) {
    var observer = new IntersectionObserver(
      function (entries) {
        entries.forEach(function (entry) {
          if (entry.isIntersecting) {
            entry.target.classList.add('active');
            observer.unobserve(entry.target);
          }
        });
      },
      { rootMargin: '0px 0px -80px 0px', threshold: 0.05 }
    );
    reveals.forEach(function (el) {
      observer.observe(el);
    });
  } else {
    reveals.forEach(function (el) {
      el.classList.add('active');
    });
  }

  /* Smooth scroll for anchor links */
  document.querySelectorAll('a[href^="#"]').forEach(function (anchor) {
    anchor.addEventListener('click', function (e) {
      var href = this.getAttribute('href');
      if (!href || href === '#') return;
      var target = document.querySelector(href);
      if (!target) return;
      e.preventDefault();
      target.scrollIntoView({ behavior: 'smooth', block: 'start' });
    });
  });
})();