Initial Hugo gallery site with custom landing page

- Hugo site with nicokaiser/hugo-theme-gallery (git submodule)
- Full-viewport hero with parallax scrolling (bg at 70%, text at 85% speed)
- Entrance animations on hero title and subtitle
- Bouncing scroll arrow that fades out on scroll
- Header suppressed on homepage, shown on all other pages
- Intro text section between hero and album grid
- Cats placeholder album with 8 images
- .gitignore excludes public/, resources/, .hugo_build.lock, .idea/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/js/custom.js

@@ -0,0 +1,39 @@
+(function () {
+  var hero = document.querySelector('.hero');
+  if (!hero) return;
+
+  var heroBg = hero.querySelector('.hero-bg');
+  var heroFg = hero.querySelector('.hero-fg');
+  var heroScroll = hero.querySelector('.hero-scroll');
+  var heroH = hero.offsetHeight;
+  var ticking = false;
+
+  function update() {
+    var s = window.scrollY;
+    if (s > heroH) { ticking = false; return; }
+
+    // Background: moves at ~70% of scroll speed (30% slower)
+    if (heroBg) heroBg.style.transform = 'translateY(' + (s * 0.3) + 'px)';
+
+    // Foreground text: moves at ~85% of scroll speed (15% slower)
+    if (heroFg) heroFg.style.transform = 'translateY(' + (s * 0.15) + 'px)';
+
+    // Scroll arrow: fades out in the first 25% of the hero height
+    if (heroScroll) {
+      heroScroll.style.opacity = Math.max(0, 1 - s / (heroH * 0.25)).toFixed(3);
+    }
+
+    ticking = false;
+  }
+
+  window.addEventListener('scroll', function () {
+    if (!ticking) {
+      requestAnimationFrame(update);
+      ticking = true;
+    }
+  }, { passive: true });
+
+  window.addEventListener('resize', function () {
+    heroH = hero.offsetHeight;
+  });
+})();