/* ============================================
   GrubFlip Landing Page — JS
   Smooth scroll, nav background, scroll reveal
   ============================================ */

(function () {
  'use strict';

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

  // --- Nav background on scroll ---
  var nav = document.querySelector('.nav');
  if (nav) {
    var onScroll = function () {
      if (window.scrollY > 20) {
        nav.classList.add('nav--scrolled');
      } else {
        nav.classList.remove('nav--scrolled');
      }
    };
    window.addEventListener('scroll', onScroll, { passive: true });
    onScroll();
  }

  // --- Scroll reveal (IntersectionObserver) ---
  var revealTargets = document.querySelectorAll(
    '.step, .feature-card, .testimonial__quote, .download__title'
  );

  if ('IntersectionObserver' in window && revealTargets.length) {
    revealTargets.forEach(function (el) {
      el.style.opacity = '0';
      el.style.transform = 'translateY(24px)';
      el.style.transition = 'opacity 0.5s ease, transform 0.5s ease';
    });

    var observer = new IntersectionObserver(function (entries) {
      entries.forEach(function (entry) {
        if (entry.isIntersecting) {
          entry.target.style.opacity = '1';
          entry.target.style.transform = 'translateY(0)';
          observer.unobserve(entry.target);
        }
      });
    }, { threshold: 0.15 });

    revealTargets.forEach(function (el) { observer.observe(el); });
  }
})();