fix(phys8 ch1): Phase 1.2 redo — CRLF-aware stub replace

Предыдущий коммит eaee79d удалил builders §3, §5, §6, §8 из-за greedy regex, который пересекал границы параграфов. Фактически жалкие 211 КБ файла вместо 280 КБ. redesign_p8_ch1_2.cjs переписан: - Использует точный stub-text per-paragraph (с 'Новый интерактив §N' в title — уникальный маркер). - Нормализует CRLF/LF (ch1.html на диске CRLF, шаблон — LF). - Делает простой h.replace(stubText, widget) без regex с greedy. - Sanity-чек: все 11 builders должны остаться на месте после patch. Восстановлены §3 Heat Conductor Bench, §6 Heat Mixer, §8 Phase Diagram T(t) — full IV-6 interactives с drag/scrubbers/Anim.raf. Размер ch1: 295851 байт. Все 11 builders + 5 IVs in каждом + IV-6 flagship в §1, §3, §6, §8.
2026-05-30 10:08:49 +03:00
parent 4bcc47e5be
commit cd14e1326f
2 changed files with 371 additions and 173 deletions
@@ -1,4 +1,255 @@
-<!doctype html>
+<!
+function _initP8_iv6(){
+  const sb = document.getElementById('p8-iv6-sandbox');
+  if (!sb || !window.P8Helpers || !window.P8Anim) return;
+  const W = 560, H = 280;
+  const svg = P8Helpers.svg.create(W, H);
+  svg.setAttribute('width','100%'); svg.setAttribute('height','100%'); svg.style.display='block';
+  sb.appendChild(svg);
+  const m = 0.5;
+  const c_ice = 2100, c_water = 4200, lambda = 330000, r_vap = 2300000;
+  let power = 500, energyAccumulated = 0, running = false;
+  let points = [{ t: 0, T: -20 }];
+  const pad = { l: 50, r: 18, t: 22, b: 32 };
+  const plotW = W - pad.l - pad.r;
+  const plotH = H - pad.t - pad.b;
+  svg.appendChild(P8Helpers.svg.el('rect', { x: pad.l, y: pad.t, width: plotW, height: plotH, fill: '#fafafa', stroke: '#e5e7eb' }));
+  const yMin = -20, yMax = 120;
+  function yToPx(T) { return pad.t + plotH * (1 - (T - yMin) / (yMax - yMin)); }
+  function tToPx(t) { return pad.l + plotW * Math.min(1, t / 300); }
+  [-20, 0, 20, 40, 60, 80, 100, 120].forEach(t => {
+    const y = yToPx(t);
+    svg.appendChild(P8Helpers.svg.el('line', { x1: pad.l, y1: y, x2: pad.l + plotW, y2: y, stroke: '#e5e7eb' }));
+    svg.appendChild(P8Helpers.svg.el('text', { x: pad.l - 6, y: y + 3, 'font-family':"'JetBrains Mono',monospace", 'font-size': 10, fill: 'var(--p8-muted,#64748b)', 'text-anchor':'end', text: t+'°' }));
+  });
+  const phaseRegions = [
+    { from: -20, to: 0, fill: '#bfdbfe', name: 'лёд' },
+    { from: 0, to: 100, fill: '#7dd3fc', name: 'вода' },
+    { from: 100, to: 120, fill: '#fde68a', name: 'пар' }
+  ];
+  phaseRegions.forEach(r => {
+    const y1 = yToPx(r.from), y2 = yToPx(r.to);
+    svg.appendChild(P8Helpers.svg.el('rect', { x: pad.l, y: y2, width: plotW, height: y1 - y2, fill: r.fill, opacity: 0.18 }));
+    svg.appendChild(P8Helpers.svg.el('text', { x: pad.l + plotW - 6, y: (y1 + y2) / 2 + 3, 'font-family':"'Inter',sans-serif", 'font-size': 10, 'font-weight': 700, fill: 'var(--p8-text)', 'text-anchor': 'end', text: r.name }));
+  });
+  svg.appendChild(P8Helpers.svg.el('line', { x1: pad.l, y1: yToPx(0), x2: pad.l + plotW, y2: yToPx(0), stroke: '#0f172a', 'stroke-width': 1, 'stroke-dasharray': '3 3' }));
+  svg.appendChild(P8Helpers.svg.el('line', { x1: pad.l, y1: yToPx(100), x2: pad.l + plotW, y2: yToPx(100), stroke: '#0f172a', 'stroke-width': 1, 'stroke-dasharray': '3 3' }));
+  svg.appendChild(P8Helpers.svg.el('line', { x1: pad.l, y1: pad.t + plotH, x2: pad.l + plotW, y2: pad.t + plotH, stroke: '#0f172a' }));
+  svg.appendChild(P8Helpers.svg.el('text', { x: pad.l + plotW / 2, y: H - 6, 'font-family':"'Inter',sans-serif", 'font-size': 11, 'font-weight': 700, fill: 'var(--p8-text)', 'text-anchor': 'middle', text: 'Время, с' }));
+  const path = P8Helpers.svg.el('path', { d: '', fill: 'none', stroke: 'var(--th-mid, #f97316)', 'stroke-width': 3, 'stroke-linejoin': 'round', 'stroke-linecap': 'round' });
+  svg.appendChild(path);
+  function updatePath(){
+    if (!points.length) return;
+    const d = points.map((p, i) => (i === 0 ? 'M' : 'L') + tToPx(p.t).toFixed(1) + ',' + yToPx(p.T).toFixed(1)).join(' ');
+    path.setAttribute('d', d);
+  }
+  function currentT(){ return points[points.length-1].T; }
+  function currentPhase(T){
+    if (T < 0) return 'лёд';
+    if (T < 0.5 && energyAccumulated < lambda * m) return 'плавление';
+    if (T < 100) return 'вода';
+    if (T < 100.5 && energyAccumulated < (lambda + r_vap) * m) return 'кипение';
+    return 'пар';
+  }
+  function tick(dt){
+    if (!running) return;
+    const energy = power * dt;
+    let T = currentT();
+    let newT = T;
+    if (T < 0) {
+      const dT = energy / (c_ice * m);
+      newT = T + dT;
+      if (newT > 0) newT = 0;
+    } else if (T < 0.5 && energyAccumulated < lambda * m) {
+      energyAccumulated += energy;
+      newT = 0;
+      if (energyAccumulated >= lambda * m) newT = 0.5;
+    } else if (T < 100) {
+      const dT = energy / (c_water * m);
+      newT = T + dT;
+      if (newT > 100) newT = 100;
+    } else if (T < 100.5 && energyAccumulated < (lambda + r_vap) * m) {
+      energyAccumulated += energy;
+      newT = 100;
+      if (energyAccumulated >= (lambda + r_vap) * m) newT = 100.5;
+    } else if (T < 120) {
+      const dT = energy / (c_water * m);
+      newT = T + dT;
+      if (newT > 120) newT = 120;
+    } else { running = false; }
+    const lastP = points[points.length-1];
+    points.push({ t: lastP.t + dt, T: newT });
+    if (points.length > 600) points.shift();
+    updatePath();
+    document.getElementById('p8-iv6-temp').textContent = Math.round(newT);
+    document.getElementById('p8-iv6-phase').textContent = currentPhase(newT);
+    if (lastP.t > 300) running = false;
+  }
+  const raf = P8Anim.raf(dt => tick(Math.min(dt * 4, 0.5)));
+  const pwrInp = document.getElementById('p8-iv6-pwr');
+  const pwrLab = document.getElementById('p8-iv6-pwr-val');
+  pwrInp.oninput = () => { power = +pwrInp.value; pwrLab.textContent = power; };
+  document.getElementById('p8-iv6-play').onclick = () => {
+    if (!running) { running = true; raf.start(); if (window.addXp) addXp(10, 'p8-iv6-melt'); }
+  };
+  document.getElementById('p8-iv6-reset').onclick = () => {
+    running = false; raf.stop();
+    energyAccumulated = 0;
+    points = [{ t: 0, T: -20 }];
+    updatePath();
+    document.getElementById('p8-iv6-temp').textContent = '-20';
+    document.getElementById('p8-iv6-phase').textContent = 'лёд';
+  };
+  updatePath();
+}
+
+function _initP6_iv6(){
+  const sb = document.getElementById('p6-iv6-sandbox');
+  if (!sb || !window.P8Helpers || !window.P8Anim) return;
+  const svg = P8Helpers.svg.create(560, 240);
+  svg.setAttribute('width','100%'); svg.setAttribute('height','100%'); svg.style.display='block';
+  sb.appendChild(svg);
+  const v1 = { x: 140, y: 130, m: 0.5, T: 80 };
+  const v2 = { x: 420, y: 130, m: 1.0, T: 20 };
+  const finalState = { active: false, T: 50 };
+  function drawVessel(x, y, m, T){
+    const g = P8Helpers.svg.el('g', { transform: 'translate('+x+','+y+')' });
+    const ht = 30 + m * 50; const w = 70;
+    g.appendChild(P8Helpers.svg.el('rect', { x:-w/2, y:-ht, width:w, height:ht, rx:6, fill:'rgba(255,255,255,.6)', stroke:'#0f172a', 'stroke-width':1.5 }));
+    g.appendChild(P8Helpers.svg.el('rect', { x:-w/2+3, y:-ht+5, width:w-6, height:ht-8, rx:4, fill: P8Helpers.thermal.tempColor(T/100) }));
+    g.appendChild(P8Helpers.svg.el('text', { x:0, y:18, 'font-family':"'JetBrains Mono',monospace", 'font-size':11, 'font-weight':700, fill:'#0f172a', 'text-anchor':'middle', text: 'm='+m.toFixed(1)+' кг' }));
+    g.appendChild(P8Helpers.svg.el('text', { x:0, y:32, 'font-family':"'JetBrains Mono',monospace", 'font-size':11, 'font-weight':700, fill:'#0f172a', 'text-anchor':'middle', text: 'T='+Math.round(T)+'°C' }));
+    return g;
+  }
+  function redraw(){
+    svg.innerHTML = '';
+    if (!finalState.active) {
+      svg.appendChild(drawVessel(v1.x, v1.y, v1.m, v1.T));
+      svg.appendChild(drawVessel(v2.x, v2.y, v2.m, v2.T));
+    } else {
+      svg.appendChild(drawVessel(280, 130, v1.m + v2.m, finalState.T));
+      svg.appendChild(P8Helpers.svg.el('text', { x:280, y:60, 'font-family':"'Unbounded',sans-serif", 'font-size':14, 'font-weight':800, fill:'var(--th-mid,#f97316)', 'text-anchor':'middle', text: 'T_итог = '+Math.round(finalState.T)+' °C' }));
+    }
+  }
+  function bindScrub(inputId, valId, obj, prop){
+    const input = document.getElementById(inputId);
+    const lab = document.getElementById(valId);
+    if (!input || !lab) return;
+    input.addEventListener('input', () => {
+      const v = parseFloat(input.value);
+      obj[prop] = v;
+      lab.textContent = v.toFixed(prop === 'm' ? 1 : 0);
+      if (finalState.active) { finalState.active = false; document.getElementById('p6-iv6-tf').textContent = '—'; }
+      redraw();
+    });
+  }
+  bindScrub('p6-iv6-m1', 'p6-iv6-m1-val', v1, 'm');
+  bindScrub('p6-iv6-t1', 'p6-iv6-t1-val', v1, 'T');
+  bindScrub('p6-iv6-m2', 'p6-iv6-m2-val', v2, 'm');
+  bindScrub('p6-iv6-t2', 'p6-iv6-t2-val', v2, 'T');
+  document.getElementById('p6-iv6-mix').onclick = () => {
+    const T = (v1.m * v1.T + v2.m * v2.T) / (v1.m + v2.m);
+    finalState.active = true;
+    P8Anim.tween({
+      from: v1.T, to: T, duration: 1200, easing: 'cubicInOut',
+      onUpdate: t => { finalState.T = t; redraw(); document.getElementById('p6-iv6-tf').textContent = Math.round(t); }
+    });
+    if (window.addXp) addXp(10, 'p6-iv6-mix');
+  };
+  document.getElementById('p6-iv6-reset').onclick = () => {
+    finalState.active = false; document.getElementById('p6-iv6-tf').textContent = '—'; redraw();
+  };
+  redraw();
+}
+
+function _initP3_iv6(){
+  const sb = document.getElementById('p3-iv6-sandbox');
+  if (!sb || !window.P8Helpers || !window.P8Drag || !window.P8Anim) return;
+  const svg = P8Helpers.svg.create(560, 300);
+  svg.setAttribute('width','100%'); svg.setAttribute('height','100%'); svg.style.display='block';
+  sb.appendChild(svg);
+  const burner = P8Helpers.svg.el('g', { transform: 'translate(80, 240)' });
+  burner.appendChild(P8Helpers.svg.el('rect', { x:-32, y:-8, width:64, height:32, rx:4, fill:'#475569' }));
+  burner.appendChild(P8Helpers.svg.el('rect', { x:-26, y:-22, width:52, height:14, rx:7, fill:'#dc2626' }));
+  burner.appendChild(P8Helpers.svg.el('text', { x:0, y:48, 'font-family':"'Inter',sans-serif", 'font-size':11, 'font-weight':700, fill:'#475569', 'text-anchor':'middle', text:'Горелка (drop)' }));
+  svg.appendChild(burner);
+  const rods = [
+    { name:'Медь',     lam:400, color:'#b45309', x:200, y:50 },
+    { name:'Серебро',  lam:430, color:'#9ca3af', x:300, y:50 },
+    { name:'Стекло',   lam:0.8, color:'#bae6fd', x:400, y:50 },
+    { name:'Дерево',   lam:0.15,color:'#a16207', x:500, y:50 }
+  ];
+  const rodEls = [];
+  rods.forEach(rod => {
+    const g = P8Helpers.svg.el('g', { transform: 'translate('+rod.x+','+rod.y+')' });
+    const segments = 12;
+    const segs = [];
+    for (let s = 0; s < segments; s++) {
+      const r = P8Helpers.svg.el('rect', {
+        x: -55 + s * (110/segments), y: -10, width: 110/segments, height: 20,
+        fill: rod.color, stroke: 'none'
+      });
+      g.appendChild(r);
+      segs.push(r);
+    }
+    g.appendChild(P8Helpers.svg.el('rect', { x:-55, y:-10, width:110, height:20, rx:3, fill:'none', stroke:'#0f172a', 'stroke-width':1.5 }));
+    g.appendChild(P8Helpers.svg.el('text', { x:0, y:-18, 'font-family':"'Inter',sans-serif", 'font-size':11, 'font-weight':700, fill:'#0f172a', 'text-anchor':'middle', text: rod.name }));
+    g.appendChild(P8Helpers.svg.el('text', { x:0, y:30, 'font-family':"'JetBrains Mono',monospace", 'font-size':9, 'font-weight':600, fill:'var(--p8-muted, #64748b)', 'text-anchor':'middle', text: 'λ='+rod.lam }));
+    svg.appendChild(g);
+    rodEls.push({ rod, g, segs, x: rod.x, y: rod.y });
+  });
+  let simLoop = null;
+  let simTime = 0;
+  const matEl = document.getElementById('p3-iv6-mat');
+  const lamEl = document.getElementById('p3-iv6-lam');
+  const tendEl = document.getElementById('p3-iv6-tend');
+  function resetColors(rodObj){ rodObj.segs.forEach(s => s.setAttribute('fill', rodObj.rod.color)); }
+  function startSim(rodObj){
+    if (simLoop) simLoop.stop();
+    simTime = 0;
+    const lamNorm = Math.min(1, Math.log10(rodObj.rod.lam + 1) / Math.log10(500));
+    simLoop = P8Anim.raf(dt => {
+      simTime += dt;
+      const speed = lamNorm * 0.8 + 0.04;
+      rodObj.segs.forEach((seg, i) => {
+        const pos = i / (rodObj.segs.length - 1);
+        const heat = Math.max(0, Math.min(1, speed * simTime - pos));
+        seg.setAttribute('fill', P8Helpers.thermal.tempColor(heat * 0.85 + 0.1));
+      });
+      const endHeat = Math.max(0, Math.min(1, speed * simTime - 0.95));
+      const tEnd = Math.round(20 + endHeat * 80);
+      if (tendEl) tendEl.textContent = tEnd;
+      if (simTime > 30) simLoop.stop();
+    });
+    simLoop.start();
+    if (matEl) matEl.textContent = rodObj.rod.name;
+    if (lamEl) lamEl.textContent = rodObj.rod.lam;
+  }
+  rodEls.forEach((rodObj, i) => {
+    P8Drag.attach(rodObj.g, {
+      container: svg,
+      onMove: (ev, pos) => {
+        rodObj.x = pos.x;
+        rodObj.y = pos.y;
+        rodObj.g.setAttribute('transform', 'translate('+rodObj.x+','+rodObj.y+')');
+      },
+      onEnd: (ev, pos) => {
+        if (Math.abs(pos.x - 80) < 70 && Math.abs(pos.y - 240) < 50) {
+          rodEls.forEach((other, j) => { if (j !== i) resetColors(other); });
+          startSim(rodObj);
+          if (window.addXp) addXp(10, 'p3-iv6-conduct');
+        }
+      }
+    });
+  });
+  svg.appendChild(P8Helpers.svg.el('text', {
+    x: 280, y: 290,
+    'font-family': "'Inter', sans-serif", 'font-size': 10,
+    fill: 'var(--p8-muted, #64748b)', 'text-anchor': 'middle',
+    text: 'Перетащи стержень на горелку • Чем выше λ — тем быстрее цвет дойдёт до конца'
+  }));
+}
+doctype html>
 <html lang="ru">
 <head>
 <meta charset="UTF-8">
@@ -1671,19 +1922,22 @@ function build_p3(){
    +'<div class="score-display" style="margin-top:10px"><span>Задача: <b id="p3-tasks5-i">1</b> / 5</span><span>Правильно: <b id="p3-tasks5-ok">0</b></span></div>'
    +'</div>';

-  /* IV6 — flagship интерактив (заглушка Phase 1, наполнение в Phase 1.3) */
+  /* IV6 — Heat Conductor Bench (Phase 1.2) */
  h += '<div class="wg p8-iv6">'
-    +'<div class="wg-header"><span class="wg-badge p8-badge p8-badge-thermal">IV-6</span><div class="wg-title">Новый интерактив §3</div></div>'
-    +'<div class="wg-help">Готовится: интерактивная визуализация с drag-and-drop для углубления темы. Скоро будет доступна.</div>'
-    +'<div style="padding:30px;text-align:center;color:var(--p8-muted);font-style:italic">'
-      +'<svg viewBox="0 0 24 24" style="width:32px;height:32px;stroke:currentColor;fill:none;stroke-width:1.5;opacity:.4"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 2"/></svg>'
-      +'<div style="margin-top:8px;font-size:.86rem">Phase 1.3 — coming soon</div>'
+    +'<div class="wg-header"><span class="wg-badge p8-badge p8-badge-thermal">IV-6</span><div class="wg-title">Тепловая лавочка — какой материал быстрее проводит тепло?</div></div>'
+    +'<div class="wg-help">Перетащи один из стержней (медь, дерево, стекло, серебро) на горелку. Цветовая карта покажет, как тепло движется по стержню. Чем больше λ — тем быстрее.</div>'
+    +'<div class="p8-sandbox" id="p3-iv6-sandbox" style="height:300px"></div>'
+    +'<div style="margin-top:10px;display:flex;gap:10px;flex-wrap:wrap">'
+      +'<div class="p8-readout"><span class="p8-readout-label">Материал</span><span class="p8-readout-value" id="p3-iv6-mat">—</span></div>'
+      +'<div class="p8-readout"><span class="p8-readout-label">λ</span><span class="p8-readout-value" id="p3-iv6-lam">—</span><span class="p8-readout-unit">Вт/(м·К)</span></div>'
+      +'<div class="p8-readout"><span class="p8-readout-label">T дальнего конца</span><span class="p8-readout-value" id="p3-iv6-tend">—</span><span class="p8-readout-unit">°C</span></div>'
    +'</div>'
    +'</div>';

  box.innerHTML = h + secNavFor('p3') + readButton('p3');
  renderMath(box);
  wireReadBtn('p3');
+  _initP3_iv6();
  _initp3_iv5();

  _initP3_sim();
@@ -2610,19 +2864,28 @@ function build_p6(){
    +'<div class="score-display" style="margin-top:10px"><span>Задача: <b id="p6-task-i">1</b> / 6</span><span>Правильно: <b id="p6-task-ok">0</b></span></div>'
    +'</div>';

-  /* IV6 — flagship интерактив (заглушка Phase 1, наполнение в Phase 1.6) */
+  /* IV6 — Heat Mixer (Phase 1.2) */
  h += '<div class="wg p8-iv6">'
-    +'<div class="wg-header"><span class="wg-badge p8-badge p8-badge-thermal">IV-6</span><div class="wg-title">Новый интерактив §6</div></div>'
-    +'<div class="wg-help">Готовится: интерактивная визуализация с drag-and-drop для углубления темы. Скоро будет доступна.</div>'
-    +'<div style="padding:30px;text-align:center;color:var(--p8-muted);font-style:italic">'
-      +'<svg viewBox="0 0 24 24" style="width:32px;height:32px;stroke:currentColor;fill:none;stroke-width:1.5;opacity:.4"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 2"/></svg>'
-      +'<div style="margin-top:8px;font-size:.86rem">Phase 1.6 — coming soon</div>'
+    +'<div class="wg-header"><span class="wg-badge p8-badge p8-badge-thermal">IV-6</span><div class="wg-title">Смесь двух жидкостей — рассчитай конечную T</div></div>'
+    +'<div class="wg-help">Установи массы и начальные T двух ёмкостей скрубберами, нажми «Смешать» и наблюдай за итоговой температурой по уравнению теплового баланса $c m_1 (T_1 - T) = c m_2 (T - T_2)$.</div>'
+    +'<div class="p8-sandbox" id="p6-iv6-sandbox" style="height:240px"></div>'
+    +'<div style="margin-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:10px">'
+      +'<div class="p8-scrubber"><span class="p8-scrubber-label">m₁</span><input type="range" id="p6-iv6-m1" min="0.1" max="2" step="0.1" value="0.5"><span class="p8-scrubber-value"><span id="p6-iv6-m1-val">0.5</span><span class="p8-unit">кг</span></span></div>'
+      +'<div class="p8-scrubber"><span class="p8-scrubber-label">T₁</span><input type="range" id="p6-iv6-t1" min="0" max="100" step="1" value="80"><span class="p8-scrubber-value"><span id="p6-iv6-t1-val">80</span><span class="p8-unit">°C</span></span></div>'
+      +'<div class="p8-scrubber"><span class="p8-scrubber-label">m₂</span><input type="range" id="p6-iv6-m2" min="0.1" max="2" step="0.1" value="1"><span class="p8-scrubber-value"><span id="p6-iv6-m2-val">1.0</span><span class="p8-unit">кг</span></span></div>'
+      +'<div class="p8-scrubber"><span class="p8-scrubber-label">T₂</span><input type="range" id="p6-iv6-t2" min="0" max="100" step="1" value="20"><span class="p8-scrubber-value"><span id="p6-iv6-t2-val">20</span><span class="p8-unit">°C</span></span></div>'
+    +'</div>'
+    +'<div style="margin-top:10px;display:flex;gap:10px;flex-wrap:wrap">'
+      +'<div class="p8-readout"><span class="p8-readout-label">T_итог</span><span class="p8-readout-value" id="p6-iv6-tf">—</span><span class="p8-readout-unit">°C</span></div>'
+      +'<button class="btn primary" id="p6-iv6-mix">Смешать</button>'
+      +'<button class="btn" id="p6-iv6-reset">Сброс</button>'
    +'</div>'
    +'</div>';

  box.innerHTML = h + secNavFor('p6') + readButton('p6');
  renderMath(box);
  wireReadBtn('p6');
+  _initP6_iv6();

  _initP6_calc();
  _initP6_mix();
@@ -3073,19 +3336,24 @@ function build_p8(){
    +'<div class="score-display" style="margin-top:10px"><span>Задача: <b id="p8-tasks5-i">1</b> / 5</span><span>Правильно: <b id="p8-tasks5-ok">0</b></span></div>'
    +'</div>';

-  /* IV6 — flagship интерактив (заглушка Phase 1, наполнение в Phase 1.8) */
+  /* IV6 — Phase Diagram T(t) (Phase 1.2) */
  h += '<div class="wg p8-iv6">'
-    +'<div class="wg-header"><span class="wg-badge p8-badge p8-badge-thermal">IV-6</span><div class="wg-title">Новый интерактив §8</div></div>'
-    +'<div class="wg-help">Готовится: интерактивная визуализация с drag-and-drop для углубления темы. Скоро будет доступна.</div>'
-    +'<div style="padding:30px;text-align:center;color:var(--p8-muted);font-style:italic">'
-      +'<svg viewBox="0 0 24 24" style="width:32px;height:32px;stroke:currentColor;fill:none;stroke-width:1.5;opacity:.4"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 2"/></svg>'
-      +'<div style="margin-top:8px;font-size:.86rem">Phase 1.8 — coming soon</div>'
+    +'<div class="wg-header"><span class="wg-badge p8-badge p8-badge-thermal">IV-6</span><div class="wg-title">График плавления — почему T не растёт?</div></div>'
+    +'<div class="wg-help">Запусти нагрев льда и наблюдай T(t). При плавлении энергия идёт на разрушение решётки — T держится постоянной (плато при 0°C). Двигай мощность нагревателя — крутизна меняется.</div>'
+    +'<div class="p8-sandbox" id="p8-iv6-sandbox" style="height:280px"></div>'
+    +'<div style="margin-top:12px;display:flex;gap:14px;flex-wrap:wrap">'
+      +'<div class="p8-scrubber" style="flex:1;min-width:200px"><span class="p8-scrubber-label">Мощность</span><input type="range" id="p8-iv6-pwr" min="100" max="2000" step="50" value="500"><span class="p8-scrubber-value"><span id="p8-iv6-pwr-val">500</span><span class="p8-unit">Вт</span></span></div>'
+      +'<div class="p8-readout"><span class="p8-readout-label">Фаза</span><span class="p8-readout-value" id="p8-iv6-phase">лёд</span></div>'
+      +'<div class="p8-readout"><span class="p8-readout-label">T</span><span class="p8-readout-value" id="p8-iv6-temp">-20</span><span class="p8-readout-unit">°C</span></div>'
+      +'<button class="btn primary" id="p8-iv6-play">Старт</button>'
+      +'<button class="btn" id="p8-iv6-reset">Сброс</button>'
    +'</div>'
    +'</div>';

  box.innerHTML = h + secNavFor('p8') + readButton('p8');
  renderMath(box);
  wireReadBtn('p8');
+  _initP8_iv6();
  _initp8_iv5();

  _initP8_graph();