Umami tracking

static/assets/js/script.js

@@ -1,5 +1,13 @@
 const root = document.documentElement;
 const saved = window?.localStorage?.getItem('theme');
+
+// Umami: safe track (no-op if script blocked or not loaded)
+function umamiTrack(name, data) {
+    if (typeof window.umami !== 'undefined' && typeof window.umami.track === 'function') {
+        if (data != null) window.umami.track(name, data);
+        else window.umami.track(name);
+    }
+}
 const sysDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
 
 if (saved) {
@@ -27,6 +35,23 @@ if (themeToggle) {
     });
 }
 
+// Umami: scroll depth (25%, 50%, 75%, 100%) – once per milestone
+const scrollMilestones = new Set();
+function onScroll() {
+    const doc = document.documentElement;
+    const scrollTop = doc.scrollTop || document.body.scrollTop;
+    const scrollHeight = (doc.scrollHeight || document.body.scrollHeight) - window.innerHeight;
+    if (scrollHeight <= 0) return;
+    const pct = Math.round((scrollTop / scrollHeight) * 100);
+    for (const m of [25, 50, 75, 100]) {
+        if (pct >= m && !scrollMilestones.has(m)) {
+            scrollMilestones.add(m);
+            umamiTrack('scroll-depth', { depth: String(m) });
+        }
+    }
+}
+window.addEventListener('scroll', onScroll, { passive: true });
+
 // Lightbox (structure from Lightbox.svelte; we fill content and handle open/close)
 const dialog = document.querySelector('dialog.lightbox');
 const lbContent = dialog?.querySelector('.lb-content');
@@ -71,6 +96,7 @@ function openLightbox(name, type, caption) {
         lbContent.replaceChildren(picture);
     }
     lbCaption.textContent = caption || '';
+    umamiTrack('gallery-view', { name, type });
     dialog.removeAttribute('inert');
     dialog.setAttribute('aria-hidden', 'false');
     dialog.showModal();