/* =====================================================================
   Academy for Learning AI — shared front-end behavior
   Vanilla JS, no dependencies. Respects prefers-reduced-motion.
   ===================================================================== */
(function () {
  "use strict";
  var reduceMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  /* ---- Sticky header shadow on scroll ---- */
  var header = document.querySelector(".site-header");
  function onScrollHeader() {
    if (!header) return;
    header.classList.toggle("is-scrolled", window.scrollY > 12);
  }

  /* ---- Mobile nav toggle ---- */
  var toggle = document.querySelector(".nav__toggle");
  var links = document.querySelector(".nav__links");
  if (toggle && links) {
    toggle.addEventListener("click", function () {
      var open = links.classList.toggle("is-open");
      toggle.setAttribute("aria-expanded", open ? "true" : "false");
    });
    links.addEventListener("click", function (e) {
      if (e.target.tagName === "A") { links.classList.remove("is-open"); toggle.setAttribute("aria-expanded","false"); }
    });
  }

  /* ---- Smooth scroll for in-page anchors (with sticky-header offset) ---- */
  document.querySelectorAll('a[href^="#"]').forEach(function (a) {
    a.addEventListener("click", function (e) {
      var id = a.getAttribute("href");
      if (id === "#" || id.length < 2) return;
      var el = document.querySelector(id);
      if (!el) return;
      e.preventDefault();
      var top = el.getBoundingClientRect().top + window.scrollY - 80;
      window.scrollTo({ top: top, behavior: reduceMotion ? "auto" : "smooth" });
    });
  });

  /* ---- Scroll reveal via IntersectionObserver ---- */
  var revealEls = document.querySelectorAll(".reveal");
  if ("IntersectionObserver" in window && !reduceMotion) {
    var io = new IntersectionObserver(function (entries) {
      entries.forEach(function (entry) {
        if (entry.isIntersecting) { entry.target.classList.add("is-visible"); io.unobserve(entry.target); }
      });
    }, { threshold: 0.12, rootMargin: "0px 0px -8% 0px" });
    revealEls.forEach(function (el) { io.observe(el); });
  } else {
    revealEls.forEach(function (el) { el.classList.add("is-visible"); });
  }

  /* ---- Lightweight parallax (hero bg + band glow) ---- */
  var heroBg = document.querySelector(".hero__bg");
  var bandGlow = document.querySelector(".parallax-band__glow");
  var ticking = false;
  function applyParallax() {
    var y = window.scrollY;
    if (heroBg) heroBg.style.transform = "translate3d(0," + (y * 0.18).toFixed(1) + "px,0)";
    if (bandGlow) {
      var rect = bandGlow.parentElement.getBoundingClientRect();
      bandGlow.style.transform = "translate3d(0," + (rect.top * -0.08).toFixed(1) + "px,0)";
    }
    ticking = false;
  }
  function onScroll() {
    onScrollHeader();
    if (!reduceMotion && !ticking) { window.requestAnimationFrame(applyParallax); ticking = true; }
  }
  window.addEventListener("scroll", onScroll, { passive: true });
  onScrollHeader();
  if (!reduceMotion) applyParallax();

  /* ---- Footer year ---- */
  var yr = document.getElementById("year");
  if (yr) yr.textContent = new Date().getFullYear();
})();