1 files changed, 85 insertions, 0 deletions
diff --git a/_shared/docs.js b/_shared/docs.js
new file mode 100644
index 0000000..7e07310
--- /dev/null
+++ b/_shared/docs.js
@@ -0,0 +1,85 @@
+/* panto docs — progressive enhancement only.
+   The site is fully functional with this file absent or JS disabled:
+   every nav item is a real link, all content is in the HTML. This adds
+   the mobile sidebar toggle, code copy buttons, and TOC scroll-spy. */
+(function () {
+  'use strict';
+
+  /* ---- Mobile sidebar toggle ---------------------------------------- */
+  var menuBtn = document.querySelector('[data-menu-toggle]');
+  var sidebar = document.querySelector('.pd-sidebar');
+  var scrim = document.querySelector('.pd-scrim');
+  function closeMenu() {
+    if (sidebar) sidebar.classList.remove('pd-sidebar--open');
+  }
+  if (menuBtn && sidebar) {
+    menuBtn.addEventListener('click', function () {
+      sidebar.classList.toggle('pd-sidebar--open');
+    });
+  }
+  if (scrim) scrim.addEventListener('click', closeMenu);
+  if (sidebar) {
+    sidebar.addEventListener('click', function (e) {
+      if (e.target.closest('a')) closeMenu();
+    });
+  }
+
+  /* ---- Code copy buttons -------------------------------------------- */
+  document.querySelectorAll('.pg-code__copy').forEach(function (btn) {
+    btn.addEventListener('click', function () {
+      var block = btn.closest('.pg-code');
+      var pre = block && block.querySelector('pre');
+      if (!pre) return;
+      var text = pre.innerText;
+      var done = function () {
+        btn.classList.add('pg-code__copy--done');
+        var label = btn.querySelector('.pg-code__label');
+        if (label) label.textContent = 'Copied';
+        setTimeout(function () {
+          btn.classList.remove('pg-code__copy--done');
+          if (label) label.textContent = 'Copy';
+        }, 1400);
+      };
+      if (navigator.clipboard) navigator.clipboard.writeText(text).then(done, done);
+      else done();
+    });
+  });
+
+  /* ---- Scroll-spy: highlight the active section in TOC + sidebar ---- */
+  var tocLinks = Array.prototype.slice.call(document.querySelectorAll('.pd-toc__link'));
+  var sideLinks = Array.prototype.slice.call(
+    document.querySelectorAll('.pd-navsec--current .pd-navsec__link')
+  );
+  if (!tocLinks.length || !('IntersectionObserver' in window)) return;
+
+  var ids = tocLinks.map(function (a) {
+    var href = a.getAttribute('href') || '';
+    return href.charAt(0) === '#' ? href.slice(1) : href.split('#')[1];
+  }).filter(Boolean);
+
+  function setActive(id) {
+    tocLinks.forEach(function (a) {
+      var h = a.getAttribute('href') || '';
+      a.classList.toggle('pd-toc__link--active', h === '#' + id);
+    });
+    sideLinks.forEach(function (a) {
+      var h = a.getAttribute('href') || '';
+      a.classList.toggle('pd-navsec__link--active', h.split('#')[1] === id);
+    });
+  }
+
+  var visible = new Set();
+  var obs = new IntersectionObserver(function (entries) {
+    entries.forEach(function (e) {
+      if (e.isIntersecting) visible.add(e.target.id);
+      else visible.delete(e.target.id);
+    });
+    var first = ids.find(function (id) { return visible.has(id); });
+    if (first) setActive(first);
+  }, { rootMargin: '-72px 0px -68% 0px', threshold: 0 });
+
+  ids.forEach(function (id) {
+    var el = document.getElementById(id);
+    if (el) obs.observe(el);
+  });
+})();