diff --git a/backend/tests/math6-page.test.js b/backend/tests/math6-page.test.js
index ada1534..8832898 100644
--- a/backend/tests/math6-page.test.js
+++ b/backend/tests/math6-page.test.js
@@ -195,6 +195,21 @@ test('анимации: canvas-демо монтируются (headless-safe)',
   assert.deepEqual(r5.errors, [], 'ch5 без ошибок: ' + r5.errors.join(' | '));
 });
 
+test('stepPlayer: «Разбор по шагам» становится интерактивным плеером', async () => {
+  // Глава 5 §1 — есть карточка «Разбор по шагам»
+  const r5 = await loadDom('math_6_ch5.html');
+  r5.doc.defaultView.goTo('p1'); await wait(120);
+  assert.ok(r5.doc.querySelector('#p1-body .m6-step-view'), 'плеер шагов §5.1');
+  assert.ok(r5.doc.querySelectorAll('#p1-body [data-act="next"]').length >= 1, 'кнопка «Дальше» §5.1');
+  assert.ok(r5.doc.querySelectorAll('#p1-body .m6-step-dots span').length >= 3, 'точки шагов §5.1');
+  assert.deepEqual(r5.errors, [], 'ch5 без ошибок: ' + r5.errors.join(' | '));
+  // Глава 2 §1
+  const r2 = await loadDom('math_6_ch2.html');
+  r2.doc.defaultView.goTo('p1'); await wait(120);
+  assert.ok(r2.doc.querySelector('#p1-body .m6-step-view'), 'плеер шагов §2.1');
+  assert.deepEqual(r2.errors, [], 'ch2 без ошибок: ' + r2.errors.join(' | '));
+});
+
 test('hub: 6 карточек глав + курсовой финал', async () => {
   const { doc, errors } = await loadDom('math_6_hub.html');
   assert.deepEqual(errors, [], 'нет ошибок: ' + errors.join(' | '));
diff --git a/frontend/js/math6_anim.js b/frontend/js/math6_anim.js
index 9daef37..2508745 100644
--- a/frontend/js/math6_anim.js
+++ b/frontend/js/math6_anim.js
@@ -278,4 +278,65 @@ M.plotLive = function (host, opts) {
   };
 };
 
+/* ============================ КОМПОНЕНТ: ПОШАГОВЫЙ ПЛЕЕР (DOM, не canvas) ============================ */
+M.stepPlayer = function (host, opts) {
+  opts = opts || {}; var steps = opts.steps || []; if (!steps.length) return { stop: function () {} };
+  var i = 0, auto = null;
+  host.innerHTML = '';
+  var wrap = D.createElement('div');
+  wrap.innerHTML =
+    '<div class="m6-step-view" style="min-height:58px;padding:14px 16px;background:var(--sec-acc-soft,var(--pri-soft));border-radius:10px;font-size:1.02rem;line-height:1.65"></div>'
+    + '<div style="display:flex;gap:8px;align-items:center;justify-content:center;margin-top:10px;flex-wrap:wrap">'
+    + '<button class="btn" data-act="prev" type="button">Назад</button>'
+    + '<span class="m6-step-dots" style="display:inline-flex;gap:5px"></span>'
+    + '<button class="btn primary" data-act="next" type="button">Дальше</button>'
+    + '<button class="btn" data-act="auto" type="button">Авто</button></div>';
+  host.appendChild(wrap);
+  var view = wrap.querySelector('.m6-step-view'), dots = wrap.querySelector('.m6-step-dots');
+  var prevB = wrap.querySelector('[data-act="prev"]'), nextB = wrap.querySelector('[data-act="next"]'), autoB = wrap.querySelector('[data-act="auto"]');
+  for (var k = 0; k < steps.length; k++) { var dt = D.createElement('span'); dt.style.cssText = 'width:9px;height:9px;border-radius:50%;background:var(--border,#cbd5e1);transition:background .2s'; dots.appendChild(dt); }
+  function render() {
+    view.innerHTML = steps[i] || '';
+    if (W.renderMathInElement) try { W.renderMathInElement(view, { delimiters: [{ left: '$$', right: '$$', display: true }, { left: '$', right: '$', display: false }, { left: '\\[', right: '\\]', display: true }, { left: '\\(', right: '\\)', display: false }], throwOnError: false }); } catch (e) {}
+    var ds = dots.children; for (var k2 = 0; k2 < ds.length; k2++) ds[k2].style.background = (k2 === i ? 'var(--pri,#4f46e5)' : (k2 < i ? 'var(--ok,#10b981)' : 'var(--border,#cbd5e1)'));
+    prevB.disabled = i <= 0; nextB.disabled = i >= steps.length - 1;
+    prevB.style.opacity = prevB.disabled ? 0.5 : 1; nextB.style.opacity = nextB.disabled ? 0.5 : 1;
+  }
+  function go(d) { i = Math.max(0, Math.min(steps.length - 1, i + d)); render(); }
+  function stopAuto() { if (auto) { try { clearInterval(auto); } catch (e) {} auto = null; autoB.textContent = 'Авто'; } }
+  prevB.addEventListener('click', function () { stopAuto(); go(-1); });
+  nextB.addEventListener('click', function () { stopAuto(); go(1); });
+  autoB.addEventListener('click', function () {
+    if (auto) { stopAuto(); return; }
+    if (i >= steps.length - 1) { i = 0; render(); }
+    autoB.textContent = 'Пауза';
+    auto = setInterval(function () { if (i >= steps.length - 1) { stopAuto(); return; } go(1); }, 1500);
+  });
+  render();
+  return { stop: stopAuto };
+};
+
+/* Превратить карточки «Разбор по шагам» (.card с <ol> в теле) в интерактивный stepPlayer. */
+M.stepifyExamples = function (root) {
+  if (!root) return;
+  var cards = root.querySelectorAll('.card');
+  for (var ci = 0; ci < cards.length; ci++) {
+    var card = cards[ci];
+    var titleEl = card.querySelector('.card-title'); if (!titleEl) continue;
+    if (!/шаг/i.test(titleEl.textContent || '')) continue;
+    var body = card.querySelector('.card-body'); if (!body || body.__stepified) continue;
+    var ol = body.querySelector('ol'); if (!ol) continue;
+    var lis = ol.querySelectorAll('li'); if (lis.length < 2) continue;
+    var steps = [], intro = '', outro = '', node = body.firstChild;
+    while (node && node !== ol) { intro += (node.nodeType === 1 ? node.outerHTML : (node.nodeType === 3 ? node.textContent : '')); node = node.nextSibling; }
+    node = ol.nextSibling; while (node) { outro += (node.nodeType === 1 ? node.outerHTML : (node.nodeType === 3 ? node.textContent : '')); node = node.nextSibling; }
+    if (intro.replace(/<[^>]*>/g, '').trim()) steps.push('<div style="font-weight:600">' + intro + '</div>');
+    for (var li = 0; li < lis.length; li++) steps.push('<div><b style="color:var(--pri,#4f46e5)">Шаг ' + (li + 1) + '.</b> ' + lis[li].innerHTML + '</div>');
+    if (outro.replace(/<[^>]*>/g, '').trim()) steps.push(outro);
+    body.__stepified = true; body.innerHTML = '';
+    var hostEl = D.createElement('div'); body.appendChild(hostEl);
+    M.stepPlayer(hostEl, { steps: steps });
+  }
+};
+
 })(window);
diff --git a/frontend/js/math6_engine.js b/frontend/js/math6_engine.js
index 2982aa9..9b83535 100644
--- a/frontend/js/math6_engine.js
+++ b/frontend/js/math6_engine.js
@@ -184,6 +184,7 @@ function goTo(id) {
   buildSidebar(id);
   window.scrollTo({ top: 0, behavior: 'smooth' });
   if ((STATE.progress[id] || 0) < 10) bumpProgress(id, 10);
+  if (el && window.Math6Anim && window.Math6Anim.stepifyExamples) { try { window.Math6Anim.stepifyExamples(el); } catch (e) {} }
   if (el && window.renderMathInElement) setTimeout(function () { renderMath(el); }, 0);
   setTimeout(function () { try { wrapGlossary(el); } catch (e) {} }, 60);
   markLastPara(id);
diff --git a/frontend/textbooks/math_6_ch2.html b/frontend/textbooks/math_6_ch2.html
index 607a834..0644b34 100644
--- a/frontend/textbooks/math_6_ch2.html
+++ b/frontend/textbooks/math_6_ch2.html
@@ -17,6 +17,7 @@
 <script src="/js/api.js" defer></script>
 <script src="/js/xp.js" defer></script>
 <script src="/js/math6_svg.js" defer></script>
+<script src="/js/math6_anim.js" defer></script>
 <script src="/js/math6_engine.js" defer></script>
 <style>:root{--pri:#0891b2;--pri2:#0e7490;--pri-soft:#cffafe;--acc:#06b6d4;--acc2:#0891b2;--acc-soft:#ecfeff}</style>
 </head>
diff --git a/frontend/textbooks/math_6_ch3.html b/frontend/textbooks/math_6_ch3.html
index 60d5715..003ebaf 100644
--- a/frontend/textbooks/math_6_ch3.html
+++ b/frontend/textbooks/math_6_ch3.html
@@ -17,6 +17,7 @@
 <script src="/js/api.js" defer></script>
 <script src="/js/xp.js" defer></script>
 <script src="/js/math6_svg.js" defer></script>
+<script src="/js/math6_anim.js" defer></script>
 <script src="/js/math6_engine.js" defer></script>
 <style>:root{--pri:#7c3aed;--pri2:#6d28d9;--pri-soft:#ede9fe;--acc:#8b5cf6;--acc2:#7c3aed;--acc-soft:#f5f3ff}</style>
 </head>