diff --git a/assets/js/search.js b/assets/js/search.js
new file mode 100644
index 00000000..a81fdf30
--- /dev/null
+++ b/assets/js/search.js
@@ -0,0 +1,113 @@
+/*
+Copyright 2018 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Local override of Docsy's search.js. Adds dual-mode support: the
+// pre-search mode picker (see layouts/_partials/search-input.html) stores
+// the user's choice, and the Enter-to-search redirect below carries it as
+// ?mode=ai so the results page opens directly in AI-assisted mode.
+// Standard search remains the default when nothing is stored.
+
+(function ($) {
+  'use strict';
+
+  var STORAGE_KEY = 'interlisp-search-mode';
+
+  function getPreferredMode() {
+    try {
+      return window.localStorage.getItem(STORAGE_KEY) === 'ai' ? 'ai' : 'standard';
+    } catch (_) {
+      return 'standard';
+    }
+  }
+
+  function setPreferredMode(mode, skipEvent) {
+    try {
+      window.localStorage.setItem(STORAGE_KEY, mode === 'ai' ? 'ai' : 'standard');
+    } catch (_) {}
+    syncPickers(mode);
+    if (!skipEvent) {
+      // Notify the results-page toggle (vertex-search.js) on the same page.
+      try {
+        window.dispatchEvent(new CustomEvent('interlisp:search-mode-change', {
+          detail: { mode: mode }
+        }));
+      } catch (_) {}
+    }
+  }
+
+  function syncPickers(mode) {
+    var useAi = mode === 'ai';
+    var pickers = document.querySelectorAll('input.td-search-mode');
+    for (var i = 0; i < pickers.length; i++) {
+      pickers[i].checked = useAi;
+      var group = pickers[i].closest('.td-search-mode-switch');
+      if (group) {
+        var labels = group.querySelectorAll('.td-search-mode-label');
+        for (var j = 0; j < labels.length; j++) {
+          var active = labels[j].getAttribute('data-search-mode') === mode;
+          if (active) {
+            labels[j].classList.add('is-active');
+          } else {
+            labels[j].classList.remove('is-active');
+          }
+        }
+      }
+    }
+  }
+
+  var Search = {
+    init: function () {
+      $(document).ready(function () {
+        // Reflect the stored preference in every pre-search picker.
+        syncPickers(getPreferredMode());
+
+        $(document).on('change', 'input.td-search-mode', function () {
+          setPreferredMode($(this).is(':checked') ? 'ai' : 'standard');
+        });
+
+        // Side labels set an explicit mode (they must not merely toggle).
+        $(document).on('click', '.td-search-mode-label', function () {
+          setPreferredMode($(this).data('search-mode') === 'ai' ? 'ai' : 'standard');
+        });
+
+        $(document).on('keypress', '.td-search input', function (e) {
+          if (e.keyCode !== 13) {
+            return;
+          }
+
+          var query = $(this).val();
+          var params = new URLSearchParams();
+          params.set('q', query);
+          if (getPreferredMode() === 'ai') {
+            params.set('mode', 'ai');
+          }
+          var searchPage = '{{ "search/" | absURL }}?' + params.toString();
+          document.location = searchPage;
+
+          return false;
+        });
+      });
+    },
+  };
+
+  Search.init();
+
+  // Shared with vertex-search.js (results-page toggle).
+  window.interlispSearchMode = {
+    get: getPreferredMode,
+    set: setPreferredMode
+  };
+})(jQuery);
diff --git a/assets/js/vertex-search.js b/assets/js/vertex-search.js
new file mode 100644
index 00000000..7bec5908
--- /dev/null
+++ b/assets/js/vertex-search.js
@@ -0,0 +1,404 @@
+import { marked } from 'marked';
+import DOMPurify from 'dompurify';
+
+(function () {
+  'use strict';
+
+  marked.setOptions({
+    gfm: true,
+    breaks: true
+  });
+
+  // Only run on the search results page
+  const config = document.getElementById('vertex-search-config');
+  if (!config) return;
+
+  const FUNCTION_URL = config.dataset.searchUrl;
+  if (!FUNCTION_URL) {
+    console.warn('Vertex search URL not configured');
+    return;
+  }
+
+  const statusEl  = document.getElementById('vertex-search-status');
+  const hitsEl    = document.getElementById('vertex-search-hits');
+  const summaryEl = document.getElementById('vertex-search-summary');
+  const summaryTxt = document.getElementById('summary-text');
+
+  // Dual-mode search: Standard (Google CSE, default) vs AI-assisted (Vertex).
+  const googleContainer = document.getElementById('google-search-container');
+  const vertexContainer = document.getElementById('vertex-search-container');
+  const standardRadio = document.getElementById('search-mode-standard');
+  const aiRadio = document.getElementById('search-mode-ai');
+
+  const aiAvailable = Boolean(FUNCTION_URL) && aiRadio && !aiRadio.disabled;
+  const standardAvailable = standardRadio && !standardRadio.disabled;
+
+  let lastAiQuery = null;
+
+  // Shared preference with the pre-search picker (assets/js/search.js).
+  // The explicit ?mode= URL param always wins; the stored value is only a
+  // fallback so a remembered choice applies to fresh searches.
+  const STORAGE_KEY = 'interlisp-search-mode';
+
+  function getStoredMode() {
+    if (window.interlispSearchMode) return window.interlispSearchMode.get();
+    try {
+      return window.localStorage.getItem(STORAGE_KEY) === 'ai' ? 'ai' : 'standard';
+    } catch (_) {
+      return 'standard';
+    }
+  }
+
+  function syncEntryPickers(mode) {
+    const useAi = mode === 'ai';
+    const pickers = document.querySelectorAll('input.td-search-mode');
+    for (let i = 0; i < pickers.length; i++) {
+      pickers[i].checked = useAi;
+      const group = pickers[i].closest('.td-search-mode-switch');
+      if (group) {
+        const labels = group.querySelectorAll('.td-search-mode-label');
+        for (let j = 0; j < labels.length; j++) {
+          const active = labels[j].getAttribute('data-search-mode') === mode;
+          if (active) {
+            labels[j].classList.add('is-active');
+          } else {
+            labels[j].classList.remove('is-active');
+          }
+        }
+      }
+    }
+  }
+
+  function publishMode(mode) {
+    // Store the user's explicit choice and reflect it in the navbar /
+    // sidebar pickers. skipEvent=true: this change originates here, so
+    // don't bounce the change event back.
+    if (window.interlispSearchMode) {
+      window.interlispSearchMode.set(mode, true);
+    } else {
+      try {
+        window.localStorage.setItem(STORAGE_KEY, mode);
+      } catch (_) {}
+      syncEntryPickers(mode);
+    }
+  }
+
+  function currentQuery() {
+    return new URLSearchParams(window.location.search).get('q') || '';
+  }
+
+  function setMode(mode, options) {
+    const updateUrl = !options || options.updateUrl !== false;
+    const useAi = mode === 'ai' && aiAvailable;
+
+    if (vertexContainer) vertexContainer.hidden = !useAi;
+    if (googleContainer) googleContainer.hidden = useAi;
+    if (aiRadio && standardRadio) {
+      (useAi ? aiRadio : standardRadio).checked = true;
+    }
+
+    if (updateUrl) {
+      const params = new URLSearchParams(window.location.search);
+      if (useAi) {
+        params.set('mode', 'ai');
+      } else {
+        params.delete('mode');
+      }
+      const next = `${window.location.pathname}?${params.toString()}`;
+      window.history.replaceState(null, '', next);
+      publishMode(useAi ? 'ai' : 'standard');
+    } else {
+      syncEntryPickers(useAi ? 'ai' : 'standard');
+    }
+
+    if (useAi) {
+      const q = currentQuery();
+      if (q !== lastAiQuery) {
+        doSearch(q);
+      }
+    }
+  }
+
+  function escapeHtml(str) {
+    if (!str) return '';
+    return str
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;')
+      .replace(/'/g, '&#39;');
+  }
+
+  // Allowlist http(s) URLs only. Prevents `javascript:` / `data:` payloads
+  // from backend or index content becoming clickable links.
+  function safeHttpUrl(raw) {
+    try {
+      const u = new URL(raw, window.location.origin);
+      return (u.protocol === 'http:' || u.protocol === 'https:') ? u.toString() : null;
+    } catch (_) {
+      return null;
+    }
+  }
+
+  function renderSummaryMarkdown(summaryText, citationCount) {
+    const linkedMarkdown = (summaryText || '').replace(/\[(\d+)\]/g, (_, num) => {
+      const index = Number(num);
+      if (!Number.isInteger(index) || index < 1 || index > citationCount) return `[${num}]`;
+      return `[${num}](#source-row-${index})`;
+    });
+
+    const html = marked.parse(linkedMarkdown);
+    return DOMPurify.sanitize(html, {
+      ALLOWED_TAGS: [
+        'a', 'p', 'ul', 'ol', 'li', 'strong', 'em', 'code', 'pre',
+        'blockquote', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'br'
+      ],
+      ALLOWED_ATTR: ['href', 'title', 'target', 'rel', 'id', 'class']
+    });
+  }
+
+  function renderResultSnippet(snippetText, result) {
+    if (!snippetText) return '';
+    const normalized = normalizeSnippetText(snippetText, result);
+    const html = marked.parse(normalized);
+    return DOMPurify.sanitize(html, {
+      ALLOWED_TAGS: ['p', 'b', 'strong', 'em', 'code', 'pre', 'br', 'ul', 'ol', 'li', 'a'],
+      ALLOWED_ATTR: ['href', 'title', 'target', 'rel']
+    });
+  }
+
+  function decodeHtmlEntities(text) {
+    const textarea = document.createElement('textarea');
+    textarea.innerHTML = String(text || '');
+    return textarea.value;
+  }
+
+  function normalizeSnippetText(text, result) {
+    let output = decodeHtmlEntities(text);
+
+    // Repair malformed highlight markers like "bIssue/b" or "bmedley issues/b".
+    output = output.replace(/(^|[\s(\[{])b([^\n]{1,120}?)\/b(?=[\s)\]}.,;:!?]|$)/gi,
+      (match, prefix, value) => `${prefix}<strong>${value.trim()}</strong>`);
+
+    // Repair specific backend artifact where stripped <b> highlight markers
+    // leak into URLs (e.g. "https://bgithub/b.com/Interlisp/bmedley/b/...").
+    // Intentionally narrow: generic "/b" rewrites corrupt legitimate URLs
+    // like https://blog.example.com, so only fix the known corrupted domain
+    // here. GitHub issue links are fully reconstructed in
+    // normalizeGithubIssueMentions() below.
+    output = output
+      .replace(/https:\/\/bgithub\/b\.com/gi, 'https://github.com')
+      .replace(/\s*\.\.\.\s*/g, ' ');
+
+    output = normalizeGithubIssueMentions(output, result);
+
+    // Drop noisy raw URL tails often appended by snippet extraction.
+    output = output.replace(/https?:\/\/\S+$/i, '');
+
+    // Normalize whitespace for cleaner one-line snippets.
+    output = output.replace(/\s+/g, ' ').trim();
+    return output;
+  }
+
+  function normalizeGithubIssueMentions(text, result) {
+    const repo = result?.repo;
+    if (!repo) return text;
+
+    // Fix malformed markdown links like: [Issue 609](https://bgithub/b.com/Interlisp/bmedley/b/bissues/b/609)
+    let output = text.replace(
+      /\[(Issue\s+#?\d+)\]\((https?:\/\/[^)]+)\)/gi,
+      (match, label, rawUrl) => {
+        const issueNumberMatch = label.match(/(\d+)/);
+        if (!issueNumberMatch) return match;
+        const issueNumber = issueNumberMatch[1];
+        const cleanUrl = `https://github.com/Interlisp/${repo}/issues/${issueNumber}`;
+        return `[${label}](${cleanUrl})`;
+      }
+    );
+
+    // Convert plain text mentions like "Issue 609" or "Issue #609" into links.
+    output = output.replace(/\bIssue\s+#?(\d+)\b/g, (match, num) => {
+      const issueUrl = `https://github.com/Interlisp/${repo}/issues/${num}`;
+      return `[Issue ${num}](${issueUrl})`;
+    });
+
+    return output;
+  }
+
+  function formatDisplayUrl(rawUrl) {
+    if (!rawUrl) return '';
+
+    try {
+      const parsed = new URL(rawUrl);
+      const host = parsed.host.replace(/^www\./, '');
+      const pathSegments = parsed.pathname.split('/').filter(Boolean);
+      const path = pathSegments.length > 0 ? ` › ${pathSegments.join(' › ')}` : '';
+      return `${host}${path}`;
+    } catch (_) {
+      return rawUrl;
+    }
+  }
+
+  async function doSearch(q) {
+    lastAiQuery = q;
+    if (!q) {
+      statusEl.textContent = 'Enter a search query above.';
+      statusEl.style.display = '';
+      return;
+    }
+
+    // Update page title to reflect query
+    document.title = `Search: ${q}`;
+    statusEl.style.display = '';
+    statusEl.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Searching for <strong>' +
+      escapeHtml(q) + '</strong>…';
+
+    try {
+      const url = new URL(FUNCTION_URL);
+      url.searchParams.set('q', q);
+
+      // Pass referring section as context if coming from a content page
+      const ref = document.referrer;
+      if (ref) {
+        try {
+          const refPath = new URL(ref).pathname.split('/').filter(Boolean);
+          if (refPath.length > 0) url.searchParams.set('context', refPath[0]);
+        } catch (_) {}
+      }
+
+      const resp = await fetch(url.toString());
+      if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
+      const data = await resp.json();
+
+      // Hide spinner
+      statusEl.style.display = 'none';
+
+      // Show AI summary if available
+      if (data.summary?.summaryText) {
+        const refs = data.summary?.citations || [];
+        const validRefs = refs.filter(r => r.title || r.uri);
+
+        summaryTxt.innerHTML = renderSummaryMarkdown(data.summary.summaryText, validRefs.length);
+
+        const inlineRefs = summaryTxt.querySelectorAll('a[href^="#source-row-"]');
+        inlineRefs.forEach((el) => {
+          el.classList.add('summary-inline-citation');
+          el.setAttribute('aria-label', `Jump to source ${el.textContent}`);
+        });
+
+        summaryEl.style.display = 'block';
+
+        // Remove stale source rows before rendering the latest list.
+        const previousCitations = summaryEl.querySelector('.search-citations');
+        if (previousCitations) previousCitations.remove();
+
+        if (validRefs.length > 0) {
+          const citationHtml = validRefs.map((ref, i) => {
+            const safeUri = ref.uri ? safeHttpUrl(ref.uri) : null;
+            const label = escapeHtml(ref.title || ref.uri || 'Unknown source');
+            const linkOrText = safeUri
+              ? `<a href="${escapeHtml(safeUri)}" target="_blank" rel="noopener">${label}</a>`
+              : `<span>${label}</span>`;
+            return `
+            <div id="source-row-${i + 1}" class="search-citation">
+              <span class="citation-number">[${i + 1}]</span>
+              ${linkOrText}
+            </div>
+          `;
+          }).join('');
+
+          const citationsDiv = document.createElement('div');
+          citationsDiv.className = 'search-citations mt-3';
+          citationsDiv.innerHTML = '<p class="citations-label">Sources</p>' + citationHtml;
+          summaryEl.querySelector('.ai-summary').appendChild(citationsDiv);
+        }
+      } else {
+        summaryTxt.innerHTML = '';
+        summaryEl.style.display = 'none';
+      }
+
+      // Show results
+      if (!data.results || data.results.length === 0) {
+        hitsEl.innerHTML = `<p>No results found for <strong>${escapeHtml(q)}</strong>.</p>`;
+        return;
+      }
+
+      // Show result count
+      hitsEl.innerHTML =
+      `<p class="text-muted mb-3">${data.results.length} results for <strong>${escapeHtml(q)}</strong></p>` +
+      data.results.map(r => {
+        const safeUrl = r.url ? safeHttpUrl(r.url) : null;
+        const title = escapeHtml(r.title || 'Untitled');
+        const titleHtml = safeUrl
+          ? `<a href="${escapeHtml(safeUrl)}">${title}</a>`
+          : `<span>${title}</span>`;
+        return `
+        <div class="td-search-hit mb-4">
+          <h5 class="td-search-hit__title mb-1">
+            ${titleHtml}
+          </h5>
+          <p class="td-search-hit__url mb-1"><small>${escapeHtml(formatDisplayUrl(r.url))}</small></p>
+          ${r.snippet ? `<div class="td-search-hit__snippet mb-1 text-muted small">${renderResultSnippet(r.snippet, r)}</div>` : ''}
+          ${(r.type || r.repo || r.state)
+            ? `<p class="td-search-hit__meta mb-0">
+                ${r.type ? `<span class="search-meta-chip">${escapeHtml(r.type)}</span>` : ''}
+                ${r.repo ? `<span class="search-meta-chip">${escapeHtml(r.repo)}</span>` : ''}
+                ${r.state ? `<span class="search-meta-chip">${escapeHtml(r.state)}</span>` : ''}
+              </p>`
+            : ''}
+        </div>
+      `;
+      }).join('');
+
+    } catch (err) {
+      statusEl.textContent = 'Search error: ' + err.message;
+      console.error('Vertex search error:', err);
+    }
+  }
+
+  // Standard search is the default; AI search only runs when toggled on
+  // (or when the URL carries ?mode=ai). This avoids Vertex cost/latency
+  // for users who never opt in.
+  function initMode() {
+    const params = new URLSearchParams(window.location.search);
+    const modeParam = params.get('mode');
+    // Explicit ?mode= wins; otherwise fall back to the remembered
+    // pre-search choice, defaulting to Standard.
+    const wantsAi = modeParam === 'ai' || (modeParam === null && getStoredMode() === 'ai');
+
+    if (!aiAvailable || !standardAvailable) {
+      // Only one backend configured: lock to it.
+      setMode(aiAvailable ? 'ai' : 'standard', { updateUrl: false });
+      return;
+    }
+
+    setMode(wantsAi ? 'ai' : 'standard', { updateUrl: false });
+  }
+
+  // Follow pre-search picker changes made elsewhere on this page
+  // (navbar / sidebar), e.g. while viewing the results page.
+  window.addEventListener('interlisp:search-mode-change', (e) => {
+    if (e && e.detail && (e.detail.mode === 'ai' || e.detail.mode === 'standard')) {
+      setMode(e.detail.mode);
+    }
+  });
+
+  if (standardRadio) {
+    standardRadio.addEventListener('change', () => {
+      if (standardRadio.checked) setMode('standard');
+    });
+  }
+  if (aiRadio) {
+    aiRadio.addEventListener('change', () => {
+      if (aiRadio.checked) setMode('ai');
+    });
+  }
+
+  // Run search on page load
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', initMode);
+  } else {
+    initMode();
+  }
+
+})();
\ No newline at end of file
diff --git a/assets/scss/_styles_project.scss b/assets/scss/_styles_project.scss
index 7f05b07e..bcd774f4 100644
--- a/assets/scss/_styles_project.scss
+++ b/assets/scss/_styles_project.scss
@@ -93,3 +93,246 @@
         padding: 0.5rem 0;
     }
 }
+
+// Search mode toggle (Standard vs AI-assisted)
+.search-mode-toggle {
+  .btn {
+    font-size: 0.875rem;
+  }
+}
+
+// Pre-search mode picker: a "Standard [switch] AI" control on its own row,
+// centered under the search box in both the navbar and the sidebar.
+// The switch takes a full flex row; in the sidebar the section-nav collapse
+// button is explicitly ordered ahead of it so the first row stays
+// [search box] [collapse button].
+.td-navbar__search {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 0.5rem;
+}
+
+.td-navbar__search,
+.td-sidebar__search {
+  .td-search {
+    flex: 1 1 10rem;
+    min-width: 0;
+    width: auto;
+  }
+}
+
+.td-sidebar__search {
+  flex-wrap: wrap;
+  gap: 0.5rem;
+
+  .td-sidebar__toggle {
+    order: 1;
+  }
+}
+
+// Flanking-label switch: "Standard [switch] AI", centered below the box.
+.td-search-mode-switch {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex: 0 0 100%;
+  order: 2;
+  gap: 0.375rem;
+
+  .form-check {
+    margin-bottom: 0;
+    min-height: 0;
+    display: inline-flex;
+    align-items: center;
+  }
+}
+
+.td-search-mode-label {
+  background: none;
+  border: none;
+  padding: 0;
+  font-size: 0.8rem;
+  line-height: 1.2;
+  color: inherit;
+  opacity: 0.65;
+  cursor: pointer;
+  white-space: nowrap;
+
+  &:hover {
+    opacity: 1;
+    text-decoration: underline;
+  }
+
+  &.is-active {
+    opacity: 1;
+    font-weight: 600;
+  }
+}
+
+// Vertex AI Search styles
+.ai-summary {
+  background: #f0f7ff;
+  border-left: 4px solid #1a73e8;
+  padding: 1rem 1.25rem;
+  margin-bottom: 1.5rem;
+  border-radius: 0 4px 4px 0;
+
+  .ai-badge {
+    font-size: 0.75rem;
+    font-weight: 600;
+    color: #1a73e8;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    display: block;
+    margin-bottom: 0.5rem;
+  }
+
+  p { margin: 0 0 0.75rem; }
+
+  p:last-child {
+    margin-bottom: 0;
+  }
+
+  ul,
+  ol {
+    margin: 0.5rem 0 0.75rem 1.25rem;
+  }
+
+  li {
+    margin-bottom: 0.35rem;
+  }
+
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    margin: 0.9rem 0 0.5rem;
+    font-size: 1rem;
+    font-weight: 700;
+    color: #124fa8;
+  }
+
+  code {
+    color: #0b4aa2;
+    background: rgba(26, 115, 232, 0.1);
+    border-radius: 3px;
+    padding: 0 0.2rem;
+  }
+}
+
+.summary-inline-citation {
+  margin-left: 0.1rem;
+  text-decoration: none;
+  font-weight: 600;
+  color: #1a73e8;
+
+  &:hover,
+  &:focus {
+    text-decoration: underline;
+  }
+}
+
+.td-search-hit {
+  padding: 1rem 0;
+  border-bottom: 1px solid #e8e8e8;
+
+  &:last-child { border-bottom: none; }
+
+  &__title {
+    margin: 0 0 0.25rem;
+    font-size: 1rem;
+    line-height: 1.35;
+    a {
+      color: #1a0dab;
+      text-decoration: none;
+    }
+
+    a:hover,
+    a:focus {
+      text-decoration: underline;
+    }
+  }
+
+  &__snippet {
+    font-size: 0.875rem;
+    color: #545454;
+    margin: 0.25rem 0;
+
+    p {
+      margin: 0 0 0.4rem;
+    }
+
+    p:last-child {
+      margin-bottom: 0;
+    }
+
+    b,
+    strong {
+      color: #1f1f1f;
+      font-weight: 700;
+    }
+  }
+
+  &__url {
+    color: #0b8043;
+    margin: 0;
+    word-break: break-word;
+  }
+
+  &__meta {
+    margin-top: 0.4rem;
+  }
+}
+
+.search-meta-chip {
+  display: inline-block;
+  margin-right: 0.35rem;
+  margin-bottom: 0.2rem;
+  padding: 0.08rem 0.45rem;
+  font-size: 0.72rem;
+  border-radius: 999px;
+  background: #eef2f7;
+  color: #4a5568;
+  border: 1px solid #dde3eb;
+}
+
+.td-search-loading,
+.td-search-no-results,
+.td-search-error {
+  padding: 1rem 0;
+  color: #666;
+}
+
+.search-citations {
+    border-top: 1px solid #d0e4ff;
+    padding-top: 0.75rem;
+    margin-top: 0.75rem;
+  
+    .citations-label {
+      font-size: 0.7rem;
+      font-weight: 700;
+      text-transform: uppercase;
+      letter-spacing: 0.05em;
+      color: #1a73e8;
+      margin-bottom: 0.4rem;
+    }
+  }
+  
+  .search-citation {
+    font-size: 0.8rem;
+    margin-bottom: 0.25rem;
+  
+    .citation-number {
+      color: #1a73e8;
+      font-weight: 600;
+      margin-right: 0.4rem;
+    }
+
+    a {
+      color: #444;
+      &:hover { color: #1a73e8; }
+    }
+  }
\ No newline at end of file
diff --git a/config/_default/params.yaml b/config/_default/params.yaml
index d1957ff6..3125f763 100644
--- a/config/_default/params.yaml
+++ b/config/_default/params.yaml
@@ -57,6 +57,9 @@ copyright:
 #  gcs_engine_id:  search engine 
 gcs_engine_id: 33ef4cbe0703b4f3a
 
+# Vertex AI Search Cloud Function URL
+vertex_search_url: "https://us-central1-interlispsearch.cloudfunctions.net/search"
+
 # Zotero Group ID for bibliography management
 zotero_group_id:  2914042
 
diff --git a/layouts/_partials/hooks/head-end.html b/layouts/_partials/hooks/head-end.html
index 14f526e3..4d3dd5ec 100644
--- a/layouts/_partials/hooks/head-end.html
+++ b/layouts/_partials/hooks/head-end.html
@@ -1,5 +1,8 @@
 <link rel="canonical" href="{{ .Permalink }}">
 <link rel="me" href="https://fosstodon.org/@interlisp">
+
+{{ $searchJS := resources.Get "js/vertex-search.js" | js.Build | fingerprint }}
+<script src="{{ $searchJS.RelPermalink }}" defer></script>
 {{- /* Emit a page-level robots directive when front matter sets `robots`.
        Docsy's head.html already emits "index, follow" for production pages;
        when both tags are present, search engines apply the most restrictive
diff --git a/layouts/_partials/search-input.html b/layouts/_partials/search-input.html
new file mode 100644
index 00000000..6a3a1cb7
--- /dev/null
+++ b/layouts/_partials/search-input.html
@@ -0,0 +1,86 @@
+{{/* cSpell:ignore docsy docsearch absurlreplacer */ -}}
+
+{{/* Local override of Docsy's search-input partial. Adds a pre-search
+     Standard / AI-assisted mode picker next to the search box when both
+     backends are configured. The picker's value is stored (localStorage)
+     and honored by assets/js/search.js on redirect, and stays in sync
+     with the results-page toggle in layouts/search.html. */ -}}
+
+{{ .Scratch.Set "docsy-search" 0 -}}
+
+{{ if .Site.Params.gcs_engine_id -}}
+{{ .Scratch.Add "docsy-search" 1 -}}
+
+<div class="td-search">
+  <div class="td-search__icon"></div>
+  <input type="search" name="q" {{/**/ -}}
+    class="td-search__input form-control td-search-input" {{/**/ -}}
+    placeholder='{{ T "ui_search" }}' {{/**/ -}}
+    aria-label='{{ T "ui_search" }}' autocomplete="off">
+</div>
+
+{{- end -}}
+
+
+{{ if and .Site.Params.search (isset .Site.Params.search "algolia") -}}
+{{ .Scratch.Add "docsy-search" 1 -}}
+{{ .Scratch.Add "docsearch-id-num" 1 -}}
+
+<div class="td-search">
+  <div class="td-search--algolia" id="docsearch-{{ mod (.Scratch.Get "docsearch-id-num") 2 }}"></div>
+</div>
+
+{{- end -}}
+
+
+{{ if .Site.Params.offlineSearch -}}
+{{ .Scratch.Add "docsy-search" 1 -}}
+
+{{ $offlineSearchIndex := resources.Get "json/offline-search-index.json" | resources.ExecuteAsTemplate "offline-search-index.json" . -}}
+{{ if hugo.IsProduction -}}
+{{/* Use `md5` as finger print hash function to shorten file name to avoid `file name too long` error. */ -}}
+{{ $offlineSearchIndex = $offlineSearchIndex | fingerprint "md5" -}}
+{{ end -}}
+{{ $offlineSearchLink := $offlineSearchIndex.RelPermalink -}}
+
+<div class="td-search td-search--offline">
+  <div class="td-search__icon"></div>
+  <input
+    type="search"
+    name="q"
+    class="td-search__input form-control"
+    placeholder='{{ T "ui_search" }}'
+    aria-label='{{ T "ui_search" }}'
+    autocomplete="off"
+    {{/*
+      The data attribute name of the json file URL must end with `src` since
+      Hugo's absurlreplacer requires `src`, `href`, `action` or `srcset` suffix for the attribute name.
+      If the absurlreplacer is not applied, the URL will start with `/`.
+      It causes the json file loading error when when relativeURLs is enabled.
+      https://github.com/google/docsy/issues/181
+    */}}
+    data-offline-search-index-json-src="{{ $offlineSearchLink }}"
+    data-offline-search-base-href="/"
+    data-offline-search-max-results="{{ .Site.Params.offlineSearchMaxResults | default 10 }}"
+  >
+</div>
+
+{{- end -}}
+
+{{ if and .Site.Params.gcs_engine_id .Site.Params.vertex_search_url -}}
+<div class="td-search-mode-switch" role="group" aria-label="Search mode">
+  <button type="button" class="td-search-mode-label is-active" data-search-mode="standard"
+    title="Standard search (Google)">Standard</button>
+  <div class="form-check form-switch">
+    <input class="form-check-input td-search-mode" type="checkbox" role="switch"
+      aria-label="AI-assisted search" title="Toggle AI-assisted search">
+  </div>
+  <button type="button" class="td-search-mode-label" data-search-mode="ai"
+    title="AI-assisted search">AI</button>
+</div>
+{{- end -}}
+
+{{ if gt (.Scratch.Get "docsy-search") 1 -}}
+{{ warnf `You have more than one site-search option configured: choose only one.
+      For details, see https://www.docsy.dev/docs/content/search.` -}}
+{{ end -}}
diff --git a/layouts/search.html b/layouts/search.html
new file mode 100644
index 00000000..718f4b62
--- /dev/null
+++ b/layouts/search.html
@@ -0,0 +1,74 @@
+{{ define "main" }}
+<section class="row td-search-result">
+  <div class="col-12 col-md-8 offset-md-2">
+    <h2 class="ms-4">{{ .Title }}</h2>
+
+    {{ $gcsID := .Site.Params.gcs_engine_id }}
+    {{ $vertexURL := .Site.Params.vertex_search_url }}
+
+    <div class="ms-4 mt-3 mb-2">
+      <div class="btn-group search-mode-toggle" role="radiogroup" aria-label="Search mode" aria-describedby="search-mode-note">
+        <input type="radio" class="btn-check" name="search-mode" id="search-mode-standard"
+          autocomplete="off" checked {{ if not $gcsID }}disabled{{ end }}>
+        <label class="btn btn-outline-primary" for="search-mode-standard">Standard</label>
+
+        <input type="radio" class="btn-check" name="search-mode" id="search-mode-ai"
+          autocomplete="off" {{ if not $vertexURL }}disabled{{ end }}>
+        <label class="btn btn-outline-primary" for="search-mode-ai">
+          <i class="fas fa-robot"></i> AI-assisted
+        </label>
+      </div>
+      <div id="search-mode-note" class="form-text mt-1">
+        Standard search uses Google. Turn on AI-assisted search for an AI summary with cited sources.
+      </div>
+    </div>
+
+    {{/* Standard Google Custom Search (currently deployed behavior, default) */}}
+    <div id="google-search-container" class="ms-4 mt-2">
+      {{ with $gcsID -}}
+      <script>
+      (function() {
+      var cx = '{{ . }}';
+      var gcse = document.createElement('script');
+      gcse.type = 'text/javascript';
+      gcse.async = true;
+      gcse.src = 'https://cse.google.com/cse.js?cx=' + cx;
+      var s = document.getElementsByTagName('script')[0];
+      s.parentNode.insertBefore(gcse, s);
+      })();
+      </script>
+      <gcse:searchresults-only></gcse:searchresults-only>
+      {{ else -}}
+      <p class="text-muted">Standard search is not configured.</p>
+      {{ end -}}
+    </div>
+
+    {{/* AI-assisted Vertex search (only active when toggled on) */}}
+    <div id="vertex-search-container" class="ms-4 mt-2" hidden>
+
+      {{/* Pass the function URL to JS */}}
+      <div id="vertex-search-config"
+        data-search-url="{{ $vertexURL }}"
+        data-query="{{ .Params.q | default "" }}"
+        style="display:none">
+      </div>
+
+      <div id="vertex-search-summary" style="display:none">
+        <div class="ai-summary mb-4">
+          <span class="ai-badge">
+            <i class="fas fa-robot"></i> AI Summary
+          </span>
+          <div id="summary-text" class="mt-2 mb-0"></div>
+        </div>
+      </div>
+
+      <div id="vertex-search-status" class="text-muted">
+        <i class="fas fa-spinner fa-spin"></i> Searching...
+      </div>
+
+      <div id="vertex-search-hits"></div>
+
+    </div>
+  </div>
+</section>
+{{ end }}
diff --git a/package-lock.json b/package-lock.json
index 82470702..e7a6b14c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,6 +2,8 @@
 
   "name": "Interlisp.github.io",
 
+  "version": "1.0.0",
+
   "lockfileVersion": 2,
 
   "requires": true,
@@ -10,12 +12,14 @@
 
     "": {
 
-      "name": "Interlisp.github.io",
-
       "dependencies": {
 
+        "dompurify": "^3.3.1",
+
         "jquery": "^3.7.1",
 
+        "marked": "^15.0.12",
+
         "tabpanel": "^0.2.0"
 
       },
@@ -44,6 +48,8 @@
 
       "dev": true,
 
+      "license": "ISC",
+
       "dependencies": {
 
         "minipass": "^7.0.4"
@@ -68,6 +74,8 @@
 
       "dev": true,
 
+      "license": "MIT",
+
       "dependencies": {
 
         "@nodelib/fs.stat": "2.0.5",
@@ -94,6 +102,8 @@
 
       "dev": true,
 
+      "license": "MIT",
+
       "engines": {
 
         "node": ">= 8"
@@ -112,6 +122,8 @@
 
       "dev": true,
 
+      "license": "MIT",
+
       "dependencies": {
 
         "@nodelib/fs.scandir": "2.1.5",
@@ -128,67 +140,35 @@
 
     },
 
-    "node_modules/adm-zip": {
-
-      "version": "0.5.16",
-
-      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.5.16.tgz",
-
-      "integrity": "sha512-TGw5yVi4saajsSEgz25grObGHEUaDrniwvA2qwSC060KfqGPdglhvPMA2lPIoxs3PQIItj2iag35fONcQqgUaQ==",
-
-      "dev": true,
-
-      "engines": {
-
-        "node": ">=12.0"
-
-      }
-
-    },
-
-    "node_modules/ansi-regex": {
-
-      "version": "5.0.1",
-
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+    "node_modules/@types/trusted-types": {
 
-      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "version": "2.0.7",
 
-      "dev": true,
+      "resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
 
-      "engines": {
+      "integrity": "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==",
 
-        "node": ">=8"
+      "license": "MIT",
 
-      }
+      "optional": true
 
     },
 
-    "node_modules/ansi-styles": {
+    "node_modules/adm-zip": {
 
-      "version": "4.3.0",
+      "version": "0.5.17",
 
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.5.17.tgz",
 
-      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "integrity": "sha512-+Ut8d9LLqwEvHHJl1+PIHqoyDxFgVN847JTVM3Izi3xHDWPE4UtzzXysMZQs64DMcrJfBeS/uoEP4AD3HQHnQQ==",
 
       "dev": true,
 
-      "dependencies": {
-
-        "color-convert": "^2.0.1"
-
-      },
+      "license": "MIT",
 
       "engines": {
 
-        "node": ">=8"
-
-      },
-
-      "funding": {
-
-        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+        "node": ">=12.0"
 
       }
 
@@ -196,14 +176,16 @@
 
     "node_modules/anymatch": {
 
-      "version": "3.1.2",
+      "version": "3.1.3",
 
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.2.tgz",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
 
-      "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==",
+      "integrity": "sha512-KMReFUr0B4t+D+OBkjR3KYqvocp2XaSzO55UcB6mgQMd3KbcE+mWTyvVV7D/zsdEbNnV6acZUutkiHQXvTr1Rw==",
 
       "dev": true,
 
+      "license": "ISC",
+
       "dependencies": {
 
         "normalize-path": "^3.0.0",
@@ -222,11 +204,11 @@
 
     "node_modules/autoprefixer": {
 
-      "version": "10.4.8",
+      "version": "10.5.0",
 
-      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.4.8.tgz",
+      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.5.0.tgz",
 
-      "integrity": "sha512-75Jr6Q/XpTqEf6D2ltS5uMewJIx5irCU1oBYJrWjFenq/m12WRRrz6g15L1EIoYvPLXTbEry7rDOwrcYNj77xw==",
+      "integrity": "sha512-FMhOoZV4+qR6aTUALKX2rEqGG+oyATvwBt9IIzVR5rMa2HRWPkxf+P+PAJLD1I/H5/II+HuZcBJYEFBpq39ong==",
 
       "dev": true,
 
@@ -246,21 +228,29 @@
 
           "url": "https://tidelift.com/funding/github/npm/autoprefixer"
 
+        },
+
+        {
+
+          "type": "github",
+
+          "url": "https://github.com/sponsors/ai"
+
         }
 
       ],
 
-      "dependencies": {
+      "license": "MIT",
 
-        "browserslist": "^4.21.3",
+      "dependencies": {
 
-        "caniuse-lite": "^1.0.30001373",
+        "browserslist": "^4.28.2",
 
-        "fraction.js": "^4.2.0",
+        "caniuse-lite": "^1.0.30001787",
 
-        "normalize-range": "^0.1.2",
+        "fraction.js": "^5.3.4",
 
-        "picocolors": "^1.0.0",
+        "picocolors": "^1.1.1",
 
         "postcss-value-parser": "^4.2.0"
 
@@ -286,20 +276,54 @@
 
     },
 
+    "node_modules/baseline-browser-mapping": {
+
+      "version": "2.10.29",
+
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.10.29.tgz",
+
+      "integrity": "sha512-Asa2krT+XTPZINCS+2QcyS8WTkObE77RwkydwF7h6DmnKqbvlalz93m/dnphUyCa6SWSP51VgtEUf2FN+gelFQ==",
+
+      "dev": true,
+
+      "license": "Apache-2.0",
+
+      "bin": {
+
+        "baseline-browser-mapping": "dist/cli.cjs"
+
+      },
+
+      "engines": {
+
+        "node": ">=6.0.0"
+
+      }
+
+    },
+
     "node_modules/binary-extensions": {
 
-      "version": "2.2.0",
+      "version": "2.3.0",
 
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.3.0.tgz",
 
-      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
+      "integrity": "sha512-Ceh+7ox5qe7LJuLHoY0feh3pHuUDHAcRUeyL2VYghZwfpkNIy/+8Ocg0a3UuSoYzavmylwuLWQOf3hl0jjMMIw==",
 
       "dev": true,
 
+      "license": "MIT",
+
       "engines": {
 
         "node": ">=8"
 
+      },
+
+      "funding": {
+
+        "url": "https://github.com/sponsors/sindresorhus"
+
       }
 
     },
@@ -314,6 +338,8 @@
 
       "dev": true,
 
+      "license": "MIT",
+
       "dependencies": {
 
         "fill-range": "^7.1.1"
@@ -330,11 +356,11 @@
 
     "node_modules/browserslist": {
 
-      "version": "4.21.3",
+      "version": "4.28.2",
 
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.21.3.tgz",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.2.tgz",
 
-      "integrity": "sha512-898rgRXLAyRkM1GryrrBHGkqA5hlpkV5MhtZwg9QXeiyLUYs2k00Un05aX5l2/yJIOObYKOpS2JNo8nJDE7fWQ==",
+      "integrity": "sha512-48xSriZYYg+8qXna9kwqjIVzuQxi+KYWp2+5nCYnYKPTr0LvD89Jqk2Or5ogxz0NUMfIjhh2lIUX/LyX9B4oIg==",
 
       "dev": true,
 
@@ -354,19 +380,31 @@
 
           "url": "https://tidelift.com/funding/github/npm/browserslist"
 
+        },
+
+        {
+
+          "type": "github",
+
+          "url": "https://github.com/sponsors/ai"
+
         }
 
       ],
 
+      "license": "MIT",
+
       "dependencies": {
 
-        "caniuse-lite": "^1.0.30001370",
+        "baseline-browser-mapping": "^2.10.12",
+
+        "caniuse-lite": "^1.0.30001782",
 
-        "electron-to-chromium": "^1.4.202",
+        "electron-to-chromium": "^1.5.328",
 
-        "node-releases": "^2.0.6",
+        "node-releases": "^2.0.36",
 
-        "update-browserslist-db": "^1.0.5"
+        "update-browserslist-db": "^1.2.3"
 
       },
 
@@ -386,11 +424,11 @@
 
     "node_modules/caniuse-lite": {
 
-      "version": "1.0.30001378",
+      "version": "1.0.30001792",
 
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001378.tgz",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001792.tgz",
 
-      "integrity": "sha512-JVQnfoO7FK7WvU4ZkBRbPjaot4+YqxogSDosHv0Hv5mWpUESmN+UubMU6L/hGz8QlQ2aY5U0vR6MOs6j/CXpNA==",
+      "integrity": "sha512-hVLMUZFgR4JJ6ACt1uEESvQN1/dBVqPAKY0hgrV70eN3391K6juAfTjKZLKvOMsx8PxA7gsY1/tLMMTcfFLLpw==",
 
       "dev": true,
 
@@ -410,33 +448,33 @@
 
           "url": "https://tidelift.com/funding/github/npm/caniuse-lite"
 
-        }
+        },
 
-      ]
+        {
 
-    },
+          "type": "github",
 
-    "node_modules/chokidar": {
+          "url": "https://github.com/sponsors/ai"
 
-      "version": "3.5.3",
+        }
 
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz",
+      ],
 
-      "integrity": "sha512-Dr3sfKRP6oTcjf2JmUmFJfeVMvXBdegxB0iVQ5eb2V10uFJUCAS8OByZdVAyVb8xXNz3GjjTgj9kLWsZTqE6kw==",
+      "license": "CC-BY-4.0"
 
-      "dev": true,
+    },
 
-      "funding": [
+    "node_modules/chokidar": {
 
-        {
+      "version": "3.6.0",
 
-          "type": "individual",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.6.0.tgz",
 
-          "url": "https://paulmillr.com/funding/"
+      "integrity": "sha512-7VT13fmjotKpGipCW9JEQAusEPE+Ei8nl6/g4FBAmIm0GOOLMua9NDDo/DWp0ZAxCr3cPq5ZpBqmPAQgDda2Pw==",
 
-        }
+      "dev": true,
 
-      ],
+      "license": "MIT",
 
       "dependencies": {
 
@@ -462,6 +500,12 @@
 
       },
 
+      "funding": {
+
+        "url": "https://paulmillr.com/funding/"
+
+      },
+
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@@ -2230,55 +2646,37 @@
 
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-      "version": "3.1.2",
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-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.2.tgz",
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@@ -2320,13 +2716,25 @@
 
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-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.21.3.tgz",
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-        "electron-to-chromium": "^1.4.202",
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-        "node-releases": "^2.0.6",
+        "node-releases": "^2.0.36",
 
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@@ -2376,11 +2786,11 @@
 
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-      "version": "3.5.3",
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-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz",
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-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
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@@ -2512,25 +3030,29 @@
 
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-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.224.tgz",
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-      "version": "8.0.0",
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-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
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@@ -2538,11 +3060,11 @@
 
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-      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
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@@ -2550,11 +3072,11 @@
 
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-      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.2.11.tgz",
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@@ -2568,7 +3090,7 @@
 
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@@ -2576,11 +3098,11 @@
 
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-      "resolved": "https://registry.npmjs.org/fastq/-/fastq-1.13.0.tgz",
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@@ -2624,11 +3146,11 @@
 
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@@ -3468,11 +3942,11 @@
 
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@@ -3480,17 +3954,17 @@
 
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-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.5.1.tgz",
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@@ -3502,7 +3976,75 @@
 
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+        "ansi-regex": {
+
+          "version": "5.0.1",
+
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+
+          "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+
+          "dev": true
+
+        },
+
+        "emoji-regex": {
+
+          "version": "8.0.0",
+
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+
+          "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+
+          "dev": true
+
+        },
+
+        "string-width": {
+
+          "version": "4.2.3",
+
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+
+          "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+
+          "dev": true,
+
+          "requires": {
+
+            "emoji-regex": "^8.0.0",
+
+            "is-fullwidth-code-point": "^3.0.0",
+
+            "strip-ansi": "^6.0.1"
+
+          }
+
+        },
+
+        "strip-ansi": {
+
+          "version": "6.0.1",
+
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+
+          "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+
+          "dev": true,
+
+          "requires": {
+
+            "ansi-regex": "^5.0.1"
+
+          }
+
+        }
 
       }
 
diff --git a/package.json b/package.json
index 7acc342b..cd73ea02 100644
--- a/package.json
+++ b/package.json
@@ -14,8 +14,12 @@
 
   "dependencies": {
 
+    "dompurify": "^3.3.1",
+
     "jquery": "^3.7.1",
 
+    "marked": "^15.0.12",
+
     "tabpanel": "^0.2.0"
 
   }
diff --git a/tests/test_hugo_build.py b/tests/test_hugo_build.py
index 55c22fee..2a98fd51 100644
--- a/tests/test_hugo_build.py
+++ b/tests/test_hugo_build.py
@@ -229,6 +229,141 @@ def test_no_sidebar_truncation_warning(self) -> None:
         ), "Sidebar entries were truncated — bibliography entries may be leaking into navigation"
 
 
+class TestSearchModeToggle:
+    """The Standard / AI-assisted search controls must reach the built site.
+
+    Regression test: ``layouts/_partials/search-input.html`` — the Docsy
+    override that renders the pre-search "Standard [switch] AI" picker below
+    the search box — was left untracked when the toggle feature was
+    committed.  Its JavaScript (``assets/js/search.js``), styles
+    (``assets/scss/_styles_project.scss``) and results-page controls
+    (``layouts/search.html``) were all committed, so local ``hugo server``
+    runs showed the picker while every build from a clean checkout fell back
+    to Docsy's ``search-input`` partial, which has none.  The control was
+    thus missing from CI builds and the deployed site with its handlers and
+    styles still shipping.  These tests assert on rendered markup, because
+    the JavaScript and CSS are inert without it.
+    """
+
+    @pytest.fixture(autouse=True)
+    def dual_mode(self, production_build):
+        self.build_result = production_build
+
+        params_file = REPO_ROOT / "config" / "_default" / "params.yaml"
+        if not params_file.exists():
+            pytest.skip("config/_default/params.yaml not found")
+        with open(params_file) as f:
+            params = yaml.safe_load(f) or {}
+
+        # Both backends must be configured for either control to render.
+        if not (params.get("gcs_engine_id") and params.get("vertex_search_url")):
+            pytest.skip(
+                "dual search mode not configured — both gcs_engine_id and "
+                "vertex_search_url are required"
+            )
+
+        index = PROD_PUBLIC / "index.html"
+        search = PROD_PUBLIC / "search" / "index.html"
+        if not (index.exists() and search.exists()):
+            pytest.skip("index.html or search/index.html not built")
+
+        self.index_html = index.read_text(encoding="utf-8", errors="ignore")
+        self.search_html = search.read_text(encoding="utf-8", errors="ignore")
+
+    def test_presearch_picker_rendered(self) -> None:
+        """The "Standard [switch] AI" picker must render under the search box.
+
+        Its presence proves the local ``search-input.html`` override is part
+        of the repository; without it Hugo silently falls back to Docsy's
+        version and the picker disappears.
+        """
+        assert 'class="td-search-mode-switch"' in self.index_html, (
+            "Pre-search mode picker missing from index.html — "
+            "layouts/_partials/search-input.html is not being used"
+        )
+        for selector in ('data-search-mode="standard"', 'data-search-mode="ai"'):
+            assert selector in self.index_html, (
+                f"Picker label {selector} missing from index.html"
+            )
+        assert 'class="form-check-input td-search-mode"' in self.index_html, (
+            "Picker switch input missing from index.html"
+        )
+
+    def test_picker_script_shipped(self) -> None:
+        """A bundled script must reference the picker selectors, so the
+        control is wired to localStorage and the ``?mode=ai`` redirect."""
+        js_dir = PROD_PUBLIC / "js"
+        if not js_dir.is_dir():
+            pytest.skip("public/js not built")
+        wired = any(
+            "td-search-mode-switch" in path.read_text(encoding="utf-8", errors="ignore")
+            for path in js_dir.rglob("*.js")
+        )
+        assert wired, (
+            "No bundled script references td-search-mode-switch — "
+            "assets/js/search.js was not built into the site"
+        )
+
+    def test_picker_defaults_to_standard(self) -> None:
+        """Both controls must be server-rendered in the Standard position.
+
+        The user's selection is persisted in localStorage, so the markup is
+        the *initial* state a first-time visitor gets before any script runs;
+        assets/js/search.js only moves the pickers off Standard once a
+        selection has been stored. A pre-checked switch, an active "AI"
+        label, or a checked AI radio in the rendered markup would hand every
+        new visitor a non-default mode.
+        """
+        assert (
+            'class="td-search-mode-label is-active" data-search-mode="standard"'
+            in self.index_html
+        ), "Standard is not the active picker label on index.html"
+        assert 'class="td-search-mode-label" data-search-mode="ai"' in self.index_html, (
+            "AI picker label is not in its inactive state on index.html"
+        )
+        switches = re.findall(r"<input[^>]*td-search-mode[^>]*>", self.index_html)
+        assert switches, "picker switch input not found on index.html"
+        checked = [s for s in switches if re.search(r"\bchecked\b", s)]
+        assert not checked, (
+            "picker switch renders checked; Standard must be the initial default:\n"
+            + "\n".join(checked)
+        )
+
+        # The results-page radios must agree: Standard selected, AI not.
+        radios = re.findall(r'<input[^>]*id="search-mode-[^"]*"[^>]*>', self.search_html)
+        assert len(radios) == 2, (
+            f"expected 2 mode radios on search/index.html, found {len(radios)}"
+        )
+        assert not any(
+            re.search(r'id="search-mode-ai"[^>]*\bchecked\b', r) for r in radios
+        ), "AI mode radio renders checked; Standard must be the initial default"
+
+    def test_results_page_toggle_rendered(self) -> None:
+        """The results page must render both mode radios and the container
+        that assets/js/vertex-search.js binds to before doing anything."""
+        for fragment in (
+            'id="search-mode-standard"',
+            'id="search-mode-ai"',
+            'id="vertex-search-container"',
+        ):
+            assert fragment in self.search_html, (
+                f"{fragment} missing from search/index.html"
+            )
+
+    def test_results_page_toggle_has_one_radiogroup(self) -> None:
+        """The mode radios must sit in a single ``role="radiogroup"``.
+
+        The toggle was originally wrapped in a radiogroup nested inside a
+        second one, which exposes the radios to assistive technology as a
+        group within a group.
+        """
+        groups = self.search_html.count('role="radiogroup"')
+        assert groups == 1, (
+            f"Expected exactly 1 role=\"radiogroup\" on search/index.html, "
+            f"found {groups} — the mode toggle radiogroups are nested"
+        )
+
+
 class TestInternalLinks:
     """All internal href links in the built HTML must resolve to existing pages."""