diff --git a/frontend/teacher-guide.html b/frontend/teacher-guide.html
index 45d7c67..af0ac21 100644
--- a/frontend/teacher-guide.html
+++ b/frontend/teacher-guide.html
@@ -157,7 +157,12 @@
     .tg-hero-chip svg { width: 13px; height: 13px; }
 
     /* Chapter */
-    .tg-chapter { margin-bottom: 56px; }
+    .tg-chapter { margin-bottom: 0; display: none; }
+    .tg-chapter.tg-active { display: block; animation: tgFadeIn 0.28s ease; }
+    @keyframes tgFadeIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }
+    /* Search mode: reveal all chapters so matches are visible */
+    .tg-content.tg-search-mode .tg-chapter { display: block; margin-bottom: 32px; }
+    .tg-content.tg-search-mode .tg-chapter.search-hidden { display: none; }
     .tg-chapter-header {
       display: flex; align-items: center; gap: 16px;
       padding: 28px 0 18px;
@@ -1061,56 +1066,54 @@
   });
   lucide.createIcons();
 
-  function navChapterClick(chId, btn) {
-    const chapter = btn.closest('.tg-nav-chapter');
-    chapter.classList.toggle('open');
-    scrollToChapter(chId);
-  }
-
-  function scrollToChapter(chId) {
-    const el = document.getElementById(chId);
-    if (el) el.scrollIntoView({ behavior: 'smooth', block: 'start' });
-  }
-
-  function scrollToSection(secId) {
-    const el = document.getElementById(secId);
-    if (el) el.scrollIntoView({ behavior: 'smooth', block: 'start' });
-  }
-
-  /* ── Scroll progress ── */
+  /* ── Chapter switching ── */
   const scrollEl = document.getElementById('tg-scroll');
   const progBar  = document.getElementById('tg-prog-bar');
+  const tgContent = document.querySelector('.tg-content');
+  let _activeChId = null;
 
-  scrollEl.addEventListener('scroll', () => {
-    const pct = scrollEl.scrollTop / (scrollEl.scrollHeight - scrollEl.clientHeight);
-    progBar.style.width = Math.round(Math.min(pct, 1) * 100) + '%';
-  });
-
-  /* ── Scroll spy (sections) ── */
-  const allSections = document.querySelectorAll('.tg-section');
-  const allNavSecs  = document.querySelectorAll('.tg-nav-sec-link');
-
-  const sectionObs = new IntersectionObserver((entries) => {
-    entries.forEach(e => {
-      if (!e.isIntersecting) return;
-      const id = e.target.id;
-      allNavSecs.forEach(a => a.classList.toggle('active', a.dataset.sec === id));
-      // Also open+highlight parent chapter
-      const ch = CHAPTERS.find(c => c.sections.includes(id));
-      if (ch) {
-        document.querySelectorAll('.tg-nav-ch-btn').forEach(b => {
-          const parentDiv = b.closest('.tg-nav-chapter');
-          const isThis = parentDiv.dataset.ch === ch.id;
-          b.classList.toggle('active', isThis);
-          if (isThis && !parentDiv.classList.contains('open')) parentDiv.classList.add('open');
-        });
-      }
+  function showChapter(chId, sectionId) {
+    const newEl = document.getElementById(chId);
+    if (!newEl) return;
+    if (_activeChId) {
+      const prev = document.getElementById(_activeChId);
+      if (prev) prev.classList.remove('tg-active');
+    }
+    newEl.classList.add('tg-active');
+    _activeChId = chId;
+    history.replaceState(null, '', '#' + chId);
+    scrollEl.scrollTop = 0;
+    if (sectionId) {
+      requestAnimationFrame(() => {
+        const sec = document.getElementById(sectionId);
+        if (sec) {
+          const top = sec.offsetTop - 80;
+          scrollEl.scrollTo({ top, behavior: 'smooth' });
+        }
+      });
+    }
+    // Nav: highlight active chapter, open its sub-list
+    document.querySelectorAll('.tg-nav-chapter').forEach(div => {
+      const isThis = div.dataset.ch === chId;
+      div.querySelector('.tg-nav-ch-btn').classList.toggle('active', isThis);
+      if (isThis && !div.classList.contains('open')) div.classList.add('open');
     });
-  }, { root: scrollEl, rootMargin: '-15% 0px -70% 0px' });
+    document.querySelectorAll('.tg-nav-sec-link').forEach(a => a.classList.remove('active'));
+    markRead(chId);
+  }
 
-  allSections.forEach(s => sectionObs.observe(s));
+  function scrollToChapter(chId)  { showChapter(chId); }
+  function scrollToSection(secId) {
+    const ch = CHAPTERS.find(c => c.sections.includes(secId));
+    if (ch) showChapter(ch.id, secId);
+  }
 
-  /* ── Chapter read tracking ── */
+  function navChapterClick(chId, btn) {
+    btn.closest('.tg-nav-chapter').classList.toggle('open');
+    showChapter(chId);
+  }
+
+  /* ── Read tracking ── */
   const READ_KEY = 'ls_tg_read';
   let readChapters = JSON.parse(localStorage.getItem(READ_KEY) || '[]');
 
@@ -1118,28 +1121,20 @@
     if (!readChapters.includes(chId)) {
       readChapters.push(chId);
       localStorage.setItem(READ_KEY, JSON.stringify(readChapters));
-      updateReadUI();
     }
+    updateReadUI();
   }
 
   function updateReadUI() {
     document.querySelectorAll('.tg-nav-chapter').forEach(div => {
-      const isRead = readChapters.includes(div.dataset.ch);
-      div.querySelector('.tg-nav-ch-btn').classList.toggle('read', isRead);
+      div.querySelector('.tg-nav-ch-btn').classList.toggle('read', readChapters.includes(div.dataset.ch));
     });
     const n = readChapters.length;
     document.getElementById('tg-prog-text').textContent = `${n} из ${CHAPTERS.length} глав прочитано`;
+    progBar.style.width = Math.round(n / CHAPTERS.length * 100) + '%';
   }
   updateReadUI();
 
-  const chapterObs = new IntersectionObserver((entries) => {
-    entries.forEach(e => {
-      if (e.isIntersecting && e.intersectionRatio >= 0.15) markRead(e.target.id);
-    });
-  }, { root: scrollEl, threshold: 0.15 });
-
-  document.querySelectorAll('.tg-chapter').forEach(c => chapterObs.observe(c));
-
   /* ── Checklist ── */
   const CL_KEY = 'ls_tg_checklist';
   const clState = JSON.parse(localStorage.getItem(CL_KEY) || '{}');
@@ -1154,7 +1149,6 @@
       localStorage.setItem(CL_KEY, JSON.stringify(clState));
       updateChecklist();
     });
-    // prevent link from triggering checkbox
     item.querySelector('.tg-cl-link')?.addEventListener('click', e => e.stopPropagation());
   });
 
@@ -1168,44 +1162,29 @@
 
   /* ── Accordion ── */
   function toggleAcc(head) {
-    const item = head.closest('.tg-acc-item');
-    item.classList.toggle('open');
+    head.closest('.tg-acc-item').classList.toggle('open');
   }
 
-  /* ── Nav search ── */
+  /* ── Search: show all chapters matching query ── */
   document.getElementById('tg-search').addEventListener('input', function() {
     const q = this.value.trim().toLowerCase();
     if (!q) {
+      tgContent.classList.remove('tg-search-mode');
       document.querySelectorAll('.tg-chapter, .tg-section').forEach(el => el.classList.remove('search-hidden'));
       return;
     }
+    tgContent.classList.add('tg-search-mode');
     document.querySelectorAll('.tg-section').forEach(sec => {
-      const text = sec.textContent.toLowerCase();
-      sec.classList.toggle('search-hidden', !text.includes(q));
+      sec.classList.toggle('search-hidden', !sec.textContent.toLowerCase().includes(q));
     });
     document.querySelectorAll('.tg-chapter').forEach(ch => {
-      const visibleSecs = ch.querySelectorAll('.tg-section:not(.search-hidden)');
-      ch.classList.toggle('search-hidden', visibleSecs.length === 0);
+      ch.classList.toggle('search-hidden', ch.querySelectorAll('.tg-section:not(.search-hidden)').length === 0);
     });
   });
 
-  /* ── Card entrance animation ── */
-  const chapObs = new IntersectionObserver((entries) => {
-    entries.forEach(e => {
-      if (e.isIntersecting) {
-        e.target.style.opacity = '1';
-        e.target.style.transform = 'translateY(0)';
-        chapObs.unobserve(e.target);
-      }
-    });
-  }, { root: scrollEl, threshold: 0.05 });
-
-  document.querySelectorAll('.tg-chapter').forEach((ch, i) => {
-    ch.style.opacity = '0';
-    ch.style.transform = 'translateY(20px)';
-    ch.style.transition = `opacity 0.4s ease ${i * 0.03}s, transform 0.4s ease ${i * 0.03}s`;
-    chapObs.observe(ch);
-  });
+  /* ── Init from hash or default ch-1 ── */
+  const initHash = location.hash.replace('#', '');
+  showChapter(CHAPTERS.find(c => c.id === initHash) ? initHash : 'ch-1');
 </script>
 </body>
 </html>