diff --git a/site/app.js b/site/app.js
index a404aef..844b8ba 100644
--- a/site/app.js
+++ b/site/app.js
@@ -369,13 +369,13 @@
     });
     var f1 = $('#f1');
     if (f1) {
-      f1.oninput = function () { s.set(f1.value); save(); liveUpdate(); if (s.type === 'slider') $('#sv').textContent = s.fmt(+f1.value); };
+      f1.oninput = function () { s.set(f1.value); save(); liveUpdate(); validate(s); if (s.type === 'slider') $('#sv').textContent = s.fmt(+f1.value); };
       if (s.type === 'slider') f1.oninput();
       /* Fix 8: Enter on a number step = press Next (when enabled). */
       if (s.type === 'number') f1.onkeydown = function (e) { if (e.key === 'Enter' && !btnNext.disabled) btnNext.click(); };
     }
     stepBody.querySelectorAll('input[type=number][data-k]').forEach(function (inp) {
-      inp.oninput = function () { s.set(inp.dataset.k, inp.value); save(); liveUpdate(); };
+      inp.oninput = function () { s.set(inp.dataset.k, inp.value); save(); liveUpdate(); validate(s); };
     });
     stepBody.querySelectorAll('input[type=range][data-k]').forEach(function (inp) {
       inp.oninput = function () {
diff --git a/tests/ui.smoke.js b/tests/ui.smoke.js
index 62b23cb..cc53457 100644
--- a/tests/ui.smoke.js
+++ b/tests/ui.smoke.js
@@ -201,16 +201,63 @@ function runPs(lang, M, done) {
   }, 400);
 }
 
+/* PS module quiz click-through — regression test (2026-10-09): typing into an initially-empty
+   PS number step (join year / service / salary) MUST re-enable Next. Pre-fix, renderStep validated
+   only at render, so the button stayed disabled and a real user was STUCK on the join step. */
+function runPsQuiz(lang, done) {
+  console.log('\n--- ' + lang.toUpperCase() + ' (PS quiz click-through) ---');
+  load(lang);
+  setTimeout(() => {
+    const opt = makeEl('opt'); opt.dataset.v = 'ON';
+    q('#step-body').querySelectorAll = (sel) => (sel === '.opt' ? [opt] : []);
+    click('btn-begin'); // re-render step 0 with patched querySelectorAll
+    const typed = {};
+    let guard = 0, joinDisabledBefore = null;
+    while (guard++ < 40) {
+      const st = JSON.parse(store[LS]);
+      const step = st.step;
+      const next = q('#btn-next');
+      if (step === 0 && !typed.prov) { opt.dataset.v = 'ON'; opt._l.click(); typed.prov = 1; continue; }
+      if (step === 11 && !typed.ps) { typed.ps = 1; opt.dataset.v = 'yes'; opt._l.click();
+        ok('PS toggle: Yes picked', JSON.parse(store[LS]).a.psPension === true); continue; }
+      if (step === 12 && !typed.join) { typed.join = 1; joinDisabledBefore = next.disabled;
+        const f1 = q('#f1'); f1.value = '2005'; f1._l.input && f1._l.input.call(f1);
+        ok('PS join step starts disabled (empty field)', joinDisabledBefore === true, 'disabled=' + joinDisabledBefore);
+        ok('typing into empty PS step enables Next (regression: validate on input)', q('#btn-next').disabled === false, 'after=' + q('#btn-next').disabled);
+        continue; }
+      if (step === 13 && !typed.svc) { typed.svc = 1; const f1 = q('#f1'); f1.value = '30'; f1._l.input && f1._l.input.call(f1); continue; }
+      if (step === 14 && !typed.sal) { typed.sal = 1; const f1 = q('#f1'); f1.value = '90000'; f1._l.input && f1._l.input.call(f1); continue; }
+      if (step === 15 && !typed.occ) { typed.occ = 1; opt.dataset.v = 'it'; opt._l.click(); continue; }
+      if (step === 16) {
+        const a2 = JSON.parse(store[LS]).a;
+        if (!a2.psItLevel) { opt.dataset.v = 'IT-03'; opt._l.click(); continue; }
+        if (!a2.psItStep) { opt.dataset.v = '3'; opt._l.click(); continue; }
+      }
+      if (next.disabled) break;
+      click('btn-next');
+      if (q('#scr-results').hidden === false) break;
+    }
+    const a = JSON.parse(store[LS]).a;
+    ok('PS click-through reached results', q('#scr-results').hidden === false, 'guard=' + guard);
+    ok('PS card rendered after click-through', !!q('#ps-card') && q('#ps-card').hidden === false);
+    ok('PS state persisted (join 2005 / service 30 / IT-03 step 3)',
+       a.psPension === true && a.psJoinYear === 2005 && a.psServiceYears === 30 && a.psOccupation === 'it' && a.psItLevel === 'IT-03' && a.psItStep === 3,
+       JSON.stringify({ j: a.psJoinYear, s: a.psServiceYears, o: a.psOccupation, l: a.psItLevel, st: a.psItStep }));
+    ok('IT step pick pre-filled salary (IT-03 s3 = 108,324)', a.psAvgSalary === 108324, a.psAvgSalary);
+    done();
+  }, 400);
+}
+
 run('en', EN, () => run('fr', FR, () => runPs('en', {
   psCard: /federal public service pension/, psAt: /60,000/, psFrom: /46,012\.50/,
   psBridge: /13,987\.50/, psSeries: /Public service pension/, psInsight: /covers about/
 }, () => runPs('fr', {
   psCard: /pension de la fonction publique fédérale/, psAt: /60[\s\u00a0\u202f]000/, psFrom: /46[\s\u00a0\u202f]012,50/,
   psBridge: /13[\s\u00a0\u202f]987,50/, psSeries: /Pension de la fonction publique/, psInsight: /couvre environ/
-}, () => {
+}, () => runPsQuiz('en', () => runPsQuiz('fr', () => {
   ok('EN privacy line present in index.html', /never leave your browser/.test(fs.readFileSync(path.join(SITE, 'index.html'), 'utf8')));
   ok('FR privacy string present in i18n.js', /ne quittent jamais votre navigateur/.test(fs.readFileSync(path.join(SITE, 'i18n.js'), 'utf8')));
   console.log(fails ? '\nSMOKE-FAIL: ' + fails + ' of ' + total : '\nSMOKE-OK all ui smoke checks passed (' + total + ')');
   process.exit(fails ? 1 : 0);
-}))))
+}))))))
 ;