diff --git a/src/app/globals.css b/src/app/globals.css
index 7d51803d..c36068d9 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -776,3 +776,163 @@ tbody tr:hover {
     opacity: 0.6;
   }
 }
+
+/* Footer CMS info popup */
+.cms-info-trigger {
+  appearance: none;
+  border: 0;
+  background: transparent;
+  color: var(--link-color-readable, var(--link-color));
+  cursor: pointer;
+  font: inherit;
+  font-size: 0.78rem;
+  font-weight: 800;
+  line-height: 1;
+  padding: 0.35rem 0.5rem;
+  text-decoration: underline;
+  text-decoration-thickness: 2px;
+  text-underline-offset: 3px;
+}
+.cms-info-trigger:hover,
+.cms-info-trigger:focus-visible {
+  color: var(--link-hover-color-readable, var(--link-hover-color));
+}
+.cms-info-trigger:focus-visible,
+.cms-info-close:focus-visible {
+  outline: 3px solid color-mix(in srgb, var(--color-primary) 42%, transparent);
+  outline-offset: 3px;
+}
+.cms-info-backdrop {
+  position: fixed;
+  inset: 0;
+  z-index: 1000;
+  display: grid;
+  place-items: center;
+  padding: 1rem;
+  background: rgba(8, 10, 14, 0.68);
+  backdrop-filter: blur(6px);
+}
+.cms-info-dialog {
+  position: relative;
+  width: min(440px, 100%);
+  border: 1px solid color-mix(in srgb, var(--color-primary) 30%, var(--border));
+  border-radius: 8px;
+  background:
+    linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 12%, transparent), transparent 42%),
+    var(--color-surface);
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.34);
+  color: var(--color-text-readable, var(--color-text));
+  padding: 1.25rem;
+}
+.cms-info-close {
+  position: absolute;
+  top: 0.75rem;
+  right: 0.75rem;
+  display: grid;
+  width: 2rem;
+  height: 2rem;
+  place-items: center;
+  border: 1px solid color-mix(in srgb, var(--color-text-muted) 18%, transparent);
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--color-surface) 84%, transparent);
+  color: var(--color-text-muted-readable, var(--color-text-muted));
+  cursor: pointer;
+  font-weight: 900;
+  line-height: 1;
+}
+.cms-info-close:hover {
+  color: var(--color-text-readable, var(--color-text));
+  border-color: color-mix(in srgb, var(--color-primary) 40%, transparent);
+}
+.cms-info-kicker {
+  color: var(--color-primary-readable, var(--color-primary));
+  font-size: 0.74rem;
+  font-weight: 900;
+  letter-spacing: 0;
+  text-transform: uppercase;
+}
+.cms-info-dialog h2 {
+  margin: 0.2rem 2.2rem 0 0;
+  font-size: 1.75rem;
+  font-weight: 900;
+  line-height: 1.1;
+}
+.cms-info-badge {
+  display: inline-flex;
+  align-items: center;
+  margin-top: 0.65rem;
+  border: 1px solid color-mix(in srgb, var(--color-primary) 34%, transparent);
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--color-primary) 14%, transparent);
+  color: var(--color-text-readable, var(--color-text));
+  font-size: 0.75rem;
+  font-weight: 900;
+  padding: 0.3rem 0.6rem;
+}
+.cms-info-copy {
+  margin: 0.9rem 0 0;
+  color: var(--color-text-muted-readable, var(--color-text-muted));
+  font-size: 0.92rem;
+  line-height: 1.55;
+}
+.cms-info-grid {
+  display: grid;
+  gap: 0.5rem;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  margin: 1rem 0 0;
+}
+.cms-info-grid div {
+  border: 1px solid color-mix(in srgb, var(--color-text-muted) 14%, transparent);
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--color-background) 68%, transparent);
+  padding: 0.7rem;
+}
+.cms-info-grid dt {
+  color: var(--color-text-muted-readable, var(--color-text-muted));
+  font-size: 0.68rem;
+  font-weight: 800;
+  text-transform: uppercase;
+}
+.cms-info-grid dd {
+  margin: 0.18rem 0 0;
+  color: var(--color-text-readable, var(--color-text));
+  font-size: 0.8rem;
+  font-weight: 900;
+  line-height: 1.25;
+}
+.cms-info-credit-list {
+  display: grid;
+  gap: 0.5rem;
+  margin-top: 1rem;
+}
+.cms-info-credit {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 1rem;
+  border: 1px solid color-mix(in srgb, var(--color-primary) 18%, transparent);
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
+  padding: 0.65rem 0.75rem;
+}
+.cms-info-credit span {
+  color: var(--color-text-readable, var(--color-text));
+  font-weight: 900;
+}
+.cms-info-credit small {
+  color: var(--color-text-muted-readable, var(--color-text-muted));
+  font-size: 0.74rem;
+  font-weight: 700;
+  text-align: right;
+}
+
+@media (max-width: 520px) {
+  .cms-info-dialog { padding: 1rem; }
+  .cms-info-grid { grid-template-columns: 1fr; }
+  .cms-info-credit {
+    align-items: flex-start;
+    flex-direction: column;
+    gap: 0.2rem;
+  }
+  .cms-info-credit small { text-align: left; }
+}
diff --git a/src/components/cms-info-popup.test.tsx b/src/components/cms-info-popup.test.tsx
new file mode 100644
index 00000000..e8e01394
--- /dev/null
+++ b/src/components/cms-info-popup.test.tsx
@@ -0,0 +1,10 @@
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it } from "vitest";
+import { CmsInfoPopup } from "@/components/cms-info-popup";
+
+describe("CmsInfoPopup", () => {
+  it("renders the footer trigger", () => {
+    const html = renderToStaticMarkup(<CmsInfoPopup />);
+    expect(html).toContain("CMS Info");
+  });
+});
diff --git a/src/components/cms-info-popup.tsx b/src/components/cms-info-popup.tsx
new file mode 100644
index 00000000..d7a197e2
--- /dev/null
+++ b/src/components/cms-info-popup.tsx
@@ -0,0 +1,56 @@
+"use client";
+
+import { useEffect, useState } from "react";
+
+const cmsDetails = [
+  ["Edition", "Next.js rebuild"],
+  ["Interface", "Public CMS"],
+  ["Runtime", "Next.js App Router"],
+];
+
+const credits = [
+  ["Remco", "AtomCMS direction and original project"],
+  ["Life", "Next.js experience and CMS refinements"],
+];
+
+export function CmsInfoPopup() {
+  const [open, setOpen] = useState(false);
+
+  useEffect(() => {
+    if (window.location.hash === "#cms-info") setOpen(true);
+  }, []);
+
+  useEffect(() => {
+    if (!open) return;
+    const onKeyDown = (event: KeyboardEvent) => {
+      if (event.key === "Escape") setOpen(false);
+    };
+    document.addEventListener("keydown", onKeyDown);
+    return () => document.removeEventListener("keydown", onKeyDown);
+  }, [open]);
+
+  return (
+    <>
+      <button type="button" className="cms-info-trigger" onClick={() => setOpen(true)}>
+        CMS Info
+      </button>
+      {open ? (
+        <div className="cms-info-backdrop" role="presentation" onMouseDown={() => setOpen(false)}>
+          <section aria-labelledby="cms-info-title" aria-modal="true" className="cms-info-dialog" role="dialog" onMouseDown={(event) => event.stopPropagation()}>
+            <button type="button" aria-label="Close CMS info" className="cms-info-close" onClick={() => setOpen(false)}>x</button>
+            <div className="cms-info-kicker">CMS information</div>
+            <h2 id="cms-info-title">AtomCMS</h2>
+            <div className="cms-info-badge">Next.js edition</div>
+            <p className="cms-info-copy">A modern web layer for the hotel community, focused on fast navigation, clean administration, and a familiar AtomCMS experience.</p>
+            <dl className="cms-info-grid">
+              {cmsDetails.map(([label, value]) => <div key={label}><dt>{label}</dt><dd>{value}</dd></div>)}
+            </dl>
+            <div className="cms-info-credit-list" aria-label="Credits">
+              {credits.map(([name, role]) => <div className="cms-info-credit" key={name}><span>{name}</span><small>{role}</small></div>)}
+            </div>
+          </section>
+        </div>
+      ) : null}
+    </>
+  );
+}
diff --git a/src/components/site-footer.tsx b/src/components/site-footer.tsx
index 26328a02..228a724f 100644
--- a/src/components/site-footer.tsx
+++ b/src/components/site-footer.tsx
@@ -1,4 +1,5 @@
 import { getTranslations } from "next-intl/server";
+import { CmsInfoPopup } from "@/components/cms-info-popup";
 import { siteSettings } from "@/lib/services/site-settings";
 
 export async function SiteFooter() {
@@ -8,7 +9,7 @@ export async function SiteFooter() {
 
   return (
     <footer
-      className="mt-auto flex h-14 w-full flex-col items-center justify-center text-sm md:flex-row md:px-8"
+      className="mt-auto flex min-h-14 w-full flex-col items-center justify-center gap-1 px-4 py-3 text-sm md:flex-row md:gap-3 md:px-8"
       style={{
         backgroundColor: "var(--color-surface)",
         color: "var(--color-text-muted-readable, var(--color-text-muted))",
@@ -17,6 +18,7 @@ export async function SiteFooter() {
       <div className="md:font-semibold text-[12px] md:text-[14px]">
         {t("copyright", { year, hotel: hotelName ?? "Atom" })}
       </div>
+      <CmsInfoPopup />
     </footer>
   );
 }