// Penumbrai marketing — light progressive enhancement only.
(function () {
  "use strict";

  // Sticky nav state
  var nav = document.getElementById("nav");
  var onScroll = function () {
    if (window.scrollY > 24) nav.classList.add("scrolled");
    else nav.classList.remove("scrolled");
  };
  window.addEventListener("scroll", onScroll, { passive: true });
  onScroll();

  // Reveal-on-scroll for major blocks
  var targets = document.querySelectorAll(
    ".section, .feature, .card, .plan, .definition, .compare__col, .schema"
  );
  targets.forEach(function (el) { el.classList.add("reveal"); });

  if ("IntersectionObserver" in window) {
    var io = new IntersectionObserver(function (entries) {
      entries.forEach(function (e) {
        if (e.isIntersecting) { e.target.classList.add("in"); io.unobserve(e.target); }
      });
    }, { threshold: 0.12, rootMargin: "0px 0px -8% 0px" });
    targets.forEach(function (el) { io.observe(el); });
  } else {
    targets.forEach(function (el) { el.classList.add("in"); });
  }

  // Demo form — front-end only stub (wires to /api/leads once deployed)
  var form = document.getElementById("demoForm");
  var note = document.getElementById("formNote");
  if (form) {
    form.addEventListener("submit", function (ev) {
      ev.preventDefault();
      var email = form.email.value.trim();
      var ok = /^[^@\s]+@[^@\s]+\.[^@\s]+$/.test(email);
      if (!ok) {
        note.textContent = "Please enter a valid work email.";
        note.style.color = "var(--risk)";
        form.email.focus();
        return;
      }
      note.textContent = "Thanks — we'll be in touch within one business day.";
      note.style.color = "var(--good)";
      form.reset();
    });
  }
})();