diff --git a/public/search-client.js b/public/search-client.js
index 0c4bfcf..5315bc2 100644
--- a/public/search-client.js
+++ b/public/search-client.js
@@ -69,29 +69,31 @@
     // the newest articles from the same index.
     async function idle() {
       if (input.value.trim().length >= 2) return;
-      list.innerHTML = '';
+      // Build off-DOM, swap atomically — clearing before the await shrinks the
+      // page mid-flight and the browser clamps the scroll position ("jumps up").
+      const frag = document.createDocumentFragment();
       const r = recents();
       if (r.length) {
-        list.append(label('Recent'));
-        for (const term of r) list.append(row([term], '/search?q=' + encodeURIComponent(term), term));
+        frag.append(label('Recent'));
+        for (const term of r) frag.append(row([term], '/search?q=' + encodeURIComponent(term), term));
       }
       const fresh = (await ensureIndex()).slice(0, Math.max(1, 5 - r.length));
       if (input.value.trim().length >= 2) return; // typed meanwhile — run() owns the list
-      list.append(label('Latest news'));
+      frag.append(label('Latest news'));
       for (const p of fresh) {
         const li = row([p.title], '/news/' + encodeURIComponent(p.slug));
         const small = document.createElement('small');
         small.textContent = p.date;
         li.append(small);
-        list.append(li);
+        frag.append(li);
       }
+      list.replaceChildren(frag);
       hint();
       status.textContent = opts.hint || (r.length ? 'Showing recent searches and latest news' : 'Showing latest news');
     }
     async function run() {
       const q = input.value.trim().toLowerCase();
-      if (q.length < 2) { list.innerHTML = ''; idle(); return; }
-      list.innerHTML = '';
+      if (q.length < 2) { list.replaceChildren(); idle(); return; }
       const idx = await ensureIndex();
       const hits = idx
         .filter((p) => (p.title + ' ' + p.description + ' ' + p.category).toLowerCase().includes(q))
@@ -100,13 +102,16 @@
       status.textContent = hits.length
         ? hits.length + ' ' + unit + (hits.length === 1 ? '' : 's') + ' for “' + input.value.trim() + '”'
         : 'No results for “' + input.value.trim() + '” — try a shorter or different term.';
+      // Off-DOM build + atomic swap (no transient page-height collapse)
+      const frag = document.createDocumentFragment();
       for (const p of hits) {
         const li = row(highlight(p.title, q), '/news/' + encodeURIComponent(p.slug));
         const small = document.createElement('small');
         small.textContent = p.date;
         li.append(small);
-        list.append(li);
+        frag.append(li);
       }
+      list.replaceChildren(frag);
       hint();
     }
     input.addEventListener('input', () => { clearTimeout(timer); timer = setTimeout(run, 150); });
diff --git a/src/pages/index.astro b/src/pages/index.astro
index b815b8a..bde48cd 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -27,10 +27,14 @@ const services = [
     icon: '<rect x="4" y="4" width="7" height="7" rx="1.5"/><rect x="13" y="4" width="7" height="7" rx="1.5"/><rect x="4" y="13" width="7" height="7" rx="1.5"/><rect x="13" y="13" width="7" height="7" rx="1.5"/>' },
   { title: 'User Support', href: '/support', desc: 'Help desk, FAQ, user forum and mailing lists.',
     icon: '<circle cx="12" cy="12" r="9"/><circle cx="12" cy="12" r="4"/><path d="m5.7 5.7 3.5 3.5m5.6 0 3.5-3.5m0 12.6-3.5-3.5m-5.6 0-3.5 3.5"/>' },
+  // Two subdued planned tiles complete the 2×3 grid (an orphan 4th tile in a
+  // 3-col grid reads broken); the remaining TBD services stay on the quiet line.
+  { title: 'Software', planned: true, desc: 'Science analysis tools and pipelines — planned.',
+    icon: '<rect x="3" y="4.5" width="18" height="15" rx="2"/><path d="m7 9.5 3 2.5-3 2.5M12.5 15H17"/>' },
+  { title: 'Documentation', planned: true, desc: 'User guides and technical documentation — planned.',
+    icon: '<path d="M12 6.7C10.6 5.2 8.6 4.5 5.7 4.5H4v13.6h1.7c2.9 0 4.9.7 6.3 2.2 1.4-1.5 3.4-2.2 6.3-2.2H20V4.5h-1.7c-2.9 0-4.9.7-6.3 2.2z"/><path d="M12 6.7v13.6"/>' },
 ];
-// Planned services (SPEC §3.1/§3.3.2, all TBD): one quiet line instead of dead
-// tiles — a grid should not ship tiles that do nothing (Apple-lens audit).
-const planned = ['Software', 'Documentation', 'Scheduling', 'Science alerts'];
+const planned = ['Scheduling', 'Science alerts'];
 ---
 <Base title="CTAO Science Portal" description="News, observation proposals, data and user services of the Cherenkov Telescope Array Observatory" ambient>
   {/* Photographic hero: LST-1 under the La Palma night sky (copied from the
@@ -66,11 +70,13 @@ const planned = ['Software', 'Documentation', 'Scheduling', 'Science alerts'];
       <div class="section-head"><h2>Services</h2></div>
       <div class="grid">
         {services.map((s) => (
-          <article class="card tile">
+          <article class={s.planned ? 'card tile tile--planned' : 'card tile'}>
             <svg class="ico" aria-hidden="true" viewBox="0 0 24 24" set:html={s.icon} />
-            <h3>{s.ext
-              ? <a class="external" href={s.href} target="_blank" rel="noopener">{s.title}</a>
-              : <a href={s.href}>{s.title}</a>}</h3>
+            <h3>{s.planned
+              ? s.title
+              : (s.ext
+                  ? <a class="external" href={s.href} target="_blank" rel="noopener">{s.title}</a>
+                  : <a href={s.href}>{s.title}</a>)}</h3>
             <p class="desc">{s.desc}</p>
           </article>
         ))}
diff --git a/src/styles/global.css b/src/styles/global.css
index 0a053e7..b26189a 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -468,7 +468,9 @@ span.page-step { color: var(--muted); } /* disabled end stop — non-interactive
 .tile { padding: var(--space-m); gap: 8px; }
 .tile .ico { width: 26px; height: 26px; stroke-width: 1.75; stroke-linejoin: round; color: var(--galaxy); }
 .tile h3 { margin: 0; }
-/* Planned services — one quiet line under the grid, never dead tiles */
+/* Planned tiles complete the grid rows but stay subdued (no link, muted) */
+.tile--planned :is(h3, .ico) { color: var(--muted); }
+/* Remaining planned services — one quiet line under the grid */
 .planned-note { color: var(--muted); font-size: var(--fs-s); margin: var(--space-m) 0 0; }
 
 /* Article — 70ch column; on ≥1200px a sticky "On this page" rail sits to the right */