diff --git a/blocks/dynamic/index.js b/blocks/dynamic/index.js
index b2f8ced..ae03afc 100644
--- a/blocks/dynamic/index.js
+++ b/blocks/dynamic/index.js
@@ -1,5 +1,8 @@
-/** Conditionally loads and runs dynamic blocks (e.g. tabs from section metadata). */
+/** Conditionally loads and runs dynamic blocks (e.g. tabs, modal). */
 export default async function dynamicBlocks(main) {
+  const { setupFragmentModal } = await import('../modal/modal.js');
+  setupFragmentModal();
+
   const hasTabSections = main?.querySelectorAll('.section[data-tab-id]').length > 0;
   if (!hasTabSections) return;
 
diff --git a/blocks/modal/modal.css b/blocks/modal/modal.css
new file mode 100644
index 0000000..e121799
--- /dev/null
+++ b/blocks/modal/modal.css
@@ -0,0 +1,71 @@
+/* Modal – opens fragment links in a dialog */
+
+.modal {
+  position: fixed;
+  inset: 0;
+  z-index: 1400;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: var(--space-s);
+}
+
+.modal[hidden] {
+  display: none;
+}
+
+.modal .modal-backdrop {
+  position: absolute;
+  inset: 0;
+  background: rgb(0 0 0 / 45%);
+}
+
+.modal .modal-dialog {
+  position: relative;
+  width: min(920px, calc(100vw - var(--space-xl)));
+  max-height: calc(100vh - var(--space-xl));
+  margin: 0;
+  overflow: auto;
+  border-radius: 12px;
+  background: light-dark(var(--color-light), var(--color-gray-900));
+  box-shadow: 0 12px 30px rgb(0 0 0 / 26%);
+  padding: var(--space-l);
+}
+
+.modal .modal-close {
+  position: sticky;
+  top: 0;
+  margin-left: auto;
+  display: block;
+  width: 32px;
+  height: 32px;
+  border: 0;
+  border-radius: 999px;
+  background: light-dark(var(--color-gray-100), var(--color-gray-700));
+  color: inherit;
+  font-size: 24px;
+  line-height: 1;
+  cursor: pointer;
+}
+
+.modal .modal-close:hover {
+  opacity: 0.9;
+}
+
+.modal .modal-content .modal-main {
+  display: block;
+  min-height: 0;
+  max-width: 100%;
+  padding: 0;
+}
+
+.modal .modal-content .modal-main > div,
+.modal .modal-content .modal-main div[data-status] {
+  display: block;
+}
+
+@media (width >= 600px) {
+  .modal {
+    padding: var(--space-m);
+  }
+}
diff --git a/blocks/modal/modal.js b/blocks/modal/modal.js
new file mode 100644
index 0000000..e73dd47
--- /dev/null
+++ b/blocks/modal/modal.js
@@ -0,0 +1,95 @@
+/*
+ * Modal Block – opens fragment links in a dialog instead of navigating.
+ */
+
+import { loadFragment } from '../fragment/fragment.js';
+import { loadCSS } from '../../scripts/aem.js';
+import { createTag } from '../../scripts/shared.js';
+import dynamicBlocks from '../dynamic/index.js';
+
+const FRAGMENT_PREFIX = '/fragments/';
+
+function getFragmentPath(href = '') {
+  try {
+    const url = new URL(href, window.location.origin);
+    if (!url.pathname.startsWith(FRAGMENT_PREFIX)) return null;
+    return `${url.pathname}${url.search}`;
+  } catch {
+    return null;
+  }
+}
+
+export function setupFragmentModal() {
+  if (window.__fragmentModalReady) return;
+  window.__fragmentModalReady = true;
+
+  loadCSS(`${window.hlx.codeBasePath}/blocks/modal/modal.css`);
+
+  const closeBtn = createTag('button', { type: 'button', class: 'modal-close', 'aria-label': 'Close dialog' }, '×');
+  const content = createTag('div', { class: 'modal-content' });
+  const dialog = createTag('div', {
+    class: 'modal-dialog',
+    role: 'dialog',
+    'aria-modal': 'true',
+    'aria-label': 'Dialog',
+  }, [closeBtn, content]);
+  const backdrop = createTag('div', { class: 'modal-backdrop', 'aria-hidden': 'true' });
+  const root = createTag('div', { class: 'modal', hidden: 'true' }, [backdrop, dialog]);
+  document.body.append(root);
+  let previousOverflow = '';
+  let previousFocus = null;
+
+  const close = () => {
+    root.hidden = true;
+    content.replaceChildren();
+    document.body.style.overflow = previousOverflow;
+    if (previousFocus?.focus) previousFocus.focus();
+  };
+
+  const open = async (path) => {
+    previousFocus = document.activeElement;
+    root.hidden = false;
+    previousOverflow = document.body.style.overflow;
+    document.body.style.overflow = 'hidden';
+    content.textContent = 'Loading...';
+    closeBtn.focus();
+
+    try {
+      const fragment = await loadFragment(path);
+      if (fragment) {
+        const main = createTag('main', { class: 'modal-main' });
+        main.append(...fragment.childNodes);
+        content.replaceChildren(main);
+        await dynamicBlocks(main);
+      } else {
+        content.textContent = 'Unable to load this content right now.';
+      }
+      dialog.scrollTop = 0;
+    } catch {
+      content.textContent = 'Unable to load this content right now.';
+    }
+  };
+
+  closeBtn.addEventListener('click', close);
+  backdrop.addEventListener('click', close);
+  window.addEventListener('keydown', (e) => {
+    if (e.key === 'Escape' && !root.hidden) close();
+  });
+
+  document.addEventListener('click', (e) => {
+    const link = e.target.closest('main a[href*="/fragments/"]');
+    if (!link) return;
+    if (link.closest('header, footer, nav, .modal')) return;
+    if (e.metaKey || e.ctrlKey || e.shiftKey || e.altKey) return;
+    if (link.target === '_blank') return;
+    const path = getFragmentPath(link.href);
+    if (!path) return;
+    e.preventDefault();
+    open(path);
+  });
+}
+
+export default function decorate(block) {
+  setupFragmentModal();
+  block.style.display = 'none';
+}