// Generator for Geometry 11 chapter files (Phase 0 skeleton).
// Produces frontend/textbooks/geometry_11_ch{1..4}.html with all helpers + STUB builders.

'use strict';
const fs = require('fs');
const path = require('path');

const OUT_DIR = path.join(__dirname, '..', '..', 'frontend', 'textbooks');

const CHAPTERS = [
  {
    n: 1,
    title: 'Призма и цилиндр',
    hdr_sub: 'Призма (правильная, прямая, наклонная, параллелепипед, куб) · цилиндр и его сечения',
    hero_h2: 'Призма и цилиндр — главные стереометрические тела',
    hero_p: 'Изучаем призму и цилиндр — главные стереометрические тела. Сечения, развёртки, формулы площадей и объёмов в 3D.',
    final_id: 'final1',
    color: {
      hdr_grad: 'linear-gradient(110deg,#92400e 0%,#d97706 55%,#fbbf24 100%)',
      hdr_label: 'РАЗДЕЛ 1',
      hdr_border: 'rgba(251,191,36,.2)',
      pri: '#d97706', pri2: '#b45309', pri_soft: '#fef3c7',
      acc: '#f59e0b', acc2: '#d97706', acc_soft: '#fef9c3',
      dark_bg: '#0a0a0e', dark_card: '#13120a', dark_card_soft: '#18160a', dark_text: '#fef9e7',
      dark_muted: '#a39070', dark_border: '#2a2512',
    },
    paras: [
      { id: 'p1', num: '§ 1', name: 'Призма', sub: '$S_{бок}=Pl$, $V=S_{осн}h$', watermark: '\\triangle' },
      { id: 'p2', num: '§ 2', name: 'Цилиндр', sub: '$S_{бок}=2\\pi Rh$, $V=\\pi R^2h$', watermark: '\\bigcirc' },
    ],
  },
  {
    n: 2,
    title: 'Пирамида и конус',
    hdr_sub: 'Пирамида (правильная, усечённая) · конус (правильный, усечённый) · объёмы через 1/3',
    hero_h2: 'Пирамида и конус — фигуры с вершиной',
    hero_p: 'Пирамида и конус — фигуры с вершиной. Правильные и усечённые. Объём через одну треть основания на высоту.',
    final_id: 'final2',
    color: {
      hdr_grad: 'linear-gradient(110deg,#064e3b 0%,#059669 55%,#34d399 100%)',
      hdr_label: 'РАЗДЕЛ 2',
      hdr_border: 'rgba(52,211,153,.2)',
      pri: '#059669', pri2: '#047857', pri_soft: '#d1fae5',
      acc: '#10b981', acc2: '#059669', acc_soft: '#a7f3d0',
      dark_bg: '#04140e', dark_card: '#082017', dark_card_soft: '#0a2a1d', dark_text: '#d1fae5',
      dark_muted: '#6ee7b7', dark_border: '#0f3a28',
    },
    paras: [
      { id: 'p3', num: '§ 3', name: 'Пирамида', sub: '$V=\\frac{1}{3}S_{осн}h$', watermark: '\\triangledown' },
      { id: 'p4', num: '§ 4', name: 'Конус', sub: '$S_{бок}=\\pi Rl$', watermark: '\\nabla' },
    ],
  },
  {
    n: 3,
    title: 'Сфера и шар',
    hdr_sub: 'Сфера и её уравнение · шар, сегменты · 5 платоновых тел',
    hero_h2: 'Сфера, шар, правильные многогранники',
    hero_p: 'Сфера, шар, пять платоновых тел. Уравнение сферы в координатах, шаровые сегменты, вписанные и описанные многогранники.',
    final_id: 'final3',
    color: {
      hdr_grad: 'linear-gradient(110deg,#3b0764 0%,#7c3aed 55%,#a78bfa 100%)',
      hdr_label: 'РАЗДЕЛ 3',
      hdr_border: 'rgba(167,139,250,.2)',
      pri: '#7c3aed', pri2: '#6d28d9', pri_soft: '#ede9fe',
      acc: '#a78bfa', acc2: '#7c3aed', acc_soft: '#f3e8ff',
      dark_bg: '#0e0521', dark_card: '#1a0a30', dark_card_soft: '#220c3d', dark_text: '#ede9fe',
      dark_muted: '#c4b5fd', dark_border: '#3a1d5e',
    },
    paras: [
      { id: 'p5', num: '§ 5', name: 'Сфера', sub: '$(x-a)^2+(y-b)^2+(z-c)^2=R^2$', watermark: 'S^2' },
      { id: 'p6', num: '§ 6', name: 'Шар', sub: '$S=4\\pi R^2$, $V=\\frac{4}{3}\\pi R^3$', watermark: 'V' },
      { id: 'p7', num: '§ 7', name: 'Правильные многогранники', sub: '5 платоновых тел', watermark: '\\star' },
    ],
  },
  {
    n: 4,
    title: 'Повторение',
    hdr_sub: 'Планиметрия · величины · координаты и векторы в 3D · построения',
    hero_h2: 'Повторение всей геометрии',
    hero_p: 'Повторение всей геометрии: планиметрия, площади и объёмы, координаты и векторы в 3D, классические построения.',
    final_id: 'final4',
    color: {
      hdr_grad: 'linear-gradient(110deg,#881337 0%,#e11d48 55%,#fb7185 100%)',
      hdr_label: 'РАЗДЕЛ 4',
      hdr_border: 'rgba(251,113,133,.2)',
      pri: '#e11d48', pri2: '#be123c', pri_soft: '#ffe4e6',
      acc: '#f43f5e', acc2: '#e11d48', acc_soft: '#fecdd3',
      dark_bg: '#1a0510', dark_card: '#2a081a', dark_card_soft: '#36102a', dark_text: '#ffe4e6',
      dark_muted: '#fda4af', dark_border: '#4a1029',
    },
    paras: [
      { id: 'p8',  num: '§ 8',  name: 'Геометрические фигуры и их свойства', sub: 'планиметрия',                  watermark: '\\square' },
      { id: 'p9',  num: '§ 9',  name: 'Геометрические величины',             sub: 'площади, объёмы',              watermark: 'S=' },
      { id: 'p10', num: '§ 10', name: 'Координаты и векторы',                sub: '3D: $\\vec{a}=(x;y;z)$',       watermark: '\\vec{v}' },
      { id: 'p11', num: '§ 11', name: 'Геометрические построения',           sub: 'циркуль и линейка',            watermark: '\\circlearrowleft' },
    ],
  },
];

function chapterTpl(ch) {
  const allParas = ch.paras.concat([{ id: ch.final_id, num: '★', name: 'Финал раздела', sub: 'Итоги · боссы раздела ' + ch.n, final: true, watermark: '\\star' }]);
  const PARAS_JS = allParas.map(p => {
    const sub = p.sub ? `, sub:'${p.sub.replace(/\\/g, '\\\\').replace(/'/g, "\\'")}'` : '';
    const fin = p.final ? `, final:true` : '';
    return `  { id:'${p.id}', num:'${p.num}', name:${JSON.stringify(p.name)}${sub}${fin} }`;
  }).join(',\n');

  // SIDEBARS (basic placeholder per para)
  const SIDEBARS_JS = allParas.map(p => {
    const t = p.final ? `Финал раздела ${ch.n}` : `Шпаргалка ${p.num}`;
    const rows = p.final
      ? `[["${ch.paras[0].num}–${ch.paras[ch.paras.length-1].num}","теория раздела ${ch.n}"],["Награда","+50 XP"]]`
      : `[["Тема", ${JSON.stringify(p.name)}],["Формула","${(p.sub || '').replace(/\\/g, '\\\\\\\\').replace(/"/g, '\\"')}"]]`;
    return `  ${p.id}:{title:${JSON.stringify(t)}, rows:${rows}}`;
  }).join(',\n');

  const TIPS_JS = allParas.map(p => {
    const html = p.final
      ? `Финал раздела ${ch.n} — интегрированные задачи по разделу.`
      : `${p.num} «${p.name}» — содержание в разработке. ${(p.sub || '').replace(/\\/g, '\\\\\\\\')}`;
    return `  {sec:'${p.id}',html:${JSON.stringify(html)}}`;
  }).join(',\n');

  const ACH_LABELS_JS = ch.paras.map(p => `  ${p.id}_done:"${p.name} освоено!"`).concat([
    `  start:"Начало раздела ${ch.n}!"`,
    `  ch${ch.n}_done:"Раздел ${ch.n} пройден!"`
  ]).join(',\n');

  // sec[id="sec-pX"] rules for accent colors
  const SEC_COLOR_RULES = allParas.map(p => {
    return `.sec[id="sec-${p.id}"]{ --sec-acc:${ch.color.pri}; --sec-acc-d:${ch.color.pri2}; --sec-acc-soft:${ch.color.pri_soft}; }`;
  }).join('\n');

  // sec elements in body
  const SEC_HTML = allParas.map(p => {
    const w = p.final ? '★' : p.watermark;
    return `    <section id="sec-${p.id}" class="sec" data-watermark="${w}"><div class="sec-header"><span class="sec-num"${p.final ? ' style="background:linear-gradient(135deg,'+ch.color.pri+','+ch.color.acc+')"' : ''}>${p.final ? '★' : p.num}</span><h2 class="sec-h">${p.name}</h2></div><div id="${p.id}-body"></div></section>`;
  }).join('\n');

  // builders map
  const BUILDERS_JS = allParas.map(p => `${p.id}:()=>buildStub('${p.id}')`).join(', ');

  // search NAMES
  const NAMES_JS = allParas.map(p => `${p.id}:'${p.final ? 'Финал' : p.num.replace('§', '\\xA7').replace(' ', '')}'`).join(',');

  const TOTAL_PARAS = allParas.length;
  const SLUG = `geometry-11-ch${ch.n}`;
  const TITLE = `Геометрия 11 · Раздел ${ch.n} · «${ch.title}»`;
  const HDR_H1 = `Геометрия 11 · Раздел ${ch.n}`;
  const HDR_LABEL = ch.color.hdr_label;
  const HDR_GRAD = ch.color.hdr_grad;
  const HDR_BORDER = ch.color.hdr_border;

  return `<!doctype html>
<html lang="ru">
<head>
<meta charset="UTF-8">
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Expires" content="0">
<title>${TITLE}</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.min.css">
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.min.js"></script>
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/contrib/auto-render.min.js"
  onload="renderMathInElement(document.body,{delimiters:[{left:'$$',right:'$$',display:true},{left:'$',right:'$',display:false},{left:'\\\\[',right:'\\\\]',display:true},{left:'\\\\(',right:'\\\\)',display:false}],throwOnError:false})"></script>
<script src="/js/api.js" defer></script>
<script src="/js/xp.js" defer></script>
<script src="/js/g3d.js" defer></script>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Manrope:wght@600;700;800;900&family=Unbounded:wght@700;800;900&family=JetBrains+Mono:wght@500;700&display=swap" rel="stylesheet">
<style>
:root{
  --bg:#fafafa; --card:#fff; --card-soft:#f8fafc; --text:#0f172a; --ink:#0f172a; --muted:#64748b;
  --border:#e2e8f0; --sh:0 1px 3px rgba(0,0,0,.06); --sh2:0 4px 14px rgba(0,0,0,.08);
  --pri:${ch.color.pri}; --pri2:${ch.color.pri2}; --pri-soft:${ch.color.pri_soft};
  --acc:${ch.color.acc}; --acc2:${ch.color.acc2}; --acc-soft:${ch.color.acc_soft};
  --ok:#10b981; --ok-bg:#d1fae5; --warn:#f59e0b; --warn-bg:#fef3c7;
  --bad:#ef4444; --fail:#dc2626; --fail-bg:#fee2e2;
}
.dark{--bg:${ch.color.dark_bg}; --card:${ch.color.dark_card}; --card-soft:${ch.color.dark_card_soft}; --text:${ch.color.dark_text}; --ink:${ch.color.dark_text}; --muted:${ch.color.dark_muted}; --border:${ch.color.dark_border}}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;font-size:15px}
button,input,select,textarea{font-family:inherit;font-size:inherit}
button{cursor:pointer;border:0;background:transparent;color:inherit}
a{color:inherit;text-decoration:none}
.ic{width:16px;height:16px;display:inline-block;flex-shrink:0;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle}

.hdr{position:relative;background:${HDR_GRAD};color:#fff;padding:46px 22px 30px;overflow:hidden;border-bottom:2px solid ${HDR_BORDER};min-height:130px}
.hdr::before{content:'${HDR_LABEL}';position:absolute;right:-12px;top:50%;transform:translateY(-50%);font-family:'Unbounded',sans-serif;font-size:clamp(5rem,15vw,11rem);font-weight:900;letter-spacing:-.04em;color:transparent;-webkit-text-stroke:1.5px rgba(255,255,255,.12);line-height:1;pointer-events:none;user-select:none;z-index:0}
.hdr-row{position:relative;z-index:1;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.hdr h1{font-family:'Unbounded',sans-serif;font-size:1.5rem;font-weight:900;letter-spacing:-.01em;line-height:1.3;padding-top:4px}
.hdr-sub{font-size:.85rem;opacity:.88;margin-top:6px;font-weight:500;line-height:1.4}
.hdr-side{margin-left:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.hdr-btn{padding:7px 12px;border-radius:9px;background:rgba(255,255,255,.14);color:#fff;font-weight:600;font-size:.82rem;display:inline-flex;align-items:center;gap:6px;transition:background .15s;text-decoration:none}
.hdr-btn:hover{background:rgba(255,255,255,.24)}

.main{max-width:1240px;margin:0 auto;padding:22px;width:100%;display:grid;grid-template-columns:1fr 280px;gap:24px}
@media(max-width:980px){.main{grid-template-columns:1fr;padding:14px}}
.col-main{min-width:0}

.hero{background:linear-gradient(135deg,var(--pri-soft) 0%,var(--acc-soft) 50%,var(--pri-soft) 100%);background-size:200% 200%;animation:heroShift 12s ease-in-out infinite;border:1px solid var(--border);border-radius:18px;padding:24px 22px;margin-bottom:24px;position:relative;overflow:hidden}
@keyframes heroShift{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}
.hero::before{content:'\\25C7';position:absolute;right:0;top:-30px;font-size:clamp(2rem,12vw,8rem);font-weight:900;color:var(--pri);opacity:.10;line-height:1;pointer-events:none;font-family:'Unbounded',sans-serif}
.hero h2{font-family:'Unbounded',sans-serif;font-size:1.55rem;font-weight:800;color:var(--pri2);margin-bottom:10px;letter-spacing:-.01em}
.hero p{font-size:.95rem;color:var(--text);opacity:.88;margin-bottom:14px;max-width:640px}
.hero-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.btn-primary{padding:11px 22px;background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;border-radius:11px;font-weight:700;font-size:.92rem;display:inline-flex;align-items:center;gap:8px;box-shadow:var(--sh2);transition:transform .15s,box-shadow .15s}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 28px rgba(0,0,0,.18)}
.hero-progress{flex:1;min-width:200px;max-width:280px}
.hp-label{font-size:.74rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;display:block;margin-bottom:5px}
.hp-bar{height:8px;background:rgba(0,0,0,.12);border-radius:5px;overflow:hidden}
.hp-fill{height:100%;background:linear-gradient(90deg,var(--pri),var(--acc));border-radius:5px;width:0%;transition:width .6s cubic-bezier(.16,1,.3,1)}
.hp-text{font-size:.78rem;color:var(--muted);font-weight:700;margin-top:4px;display:block}
.hero-xp-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:linear-gradient(135deg,var(--warn,#f59e0b),var(--pri));color:#fff;border-radius:99px;font-size:.82rem;font-weight:800;letter-spacing:.02em;box-shadow:0 4px 12px rgba(0,0,0,.18);font-family:'Unbounded',sans-serif}

.psel{margin-bottom:24px}
.psel-title{font-size:.72rem;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px}
.psel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}
.psel-card{background:var(--card);border:1.5px solid var(--border);border-radius:13px;padding:14px;cursor:pointer;transition:transform .2s,box-shadow .2s,border-color .2s;text-align:left;position:relative}
.psel-card:hover{transform:translateY(-3px);box-shadow:var(--sh2);border-color:var(--pri)}
.psel-card.active{border-color:var(--pri);background:linear-gradient(135deg,var(--pri-soft),var(--card));box-shadow:var(--sh2)}
.psel-card.active::after{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--pri),var(--acc));border-radius:13px 13px 0 0}
.psel-num{font-family:'Unbounded',sans-serif;font-size:.72rem;font-weight:800;color:var(--pri);text-transform:uppercase;letter-spacing:.08em;margin-bottom:5px}
.psel-name{font-size:.86rem;font-weight:700;color:var(--text);line-height:1.3;margin-bottom:8px}
.psel-prog{height:4px;background:rgba(0,0,0,.10);border-radius:3px;overflow:hidden}
.psel-prog-fill{height:100%;background:var(--pri);width:0%;transition:width .4s}
.psel-card.final{background:linear-gradient(135deg,var(--acc-soft),var(--pri-soft))}
.psel-card.final .psel-num{color:var(--warn)}

${SEC_COLOR_RULES}

.sec{display:none;position:relative;animation:fadeIn .35s ease}
.sec.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.sec::before{content:attr(data-watermark);position:absolute;right:-20px;top:10%;font-family:'Unbounded',sans-serif;font-size:clamp(6rem,18vw,14rem);font-weight:900;color:transparent;-webkit-text-stroke:1.5px var(--sec-acc-soft,var(--pri-soft));line-height:1;pointer-events:none;user-select:none;z-index:0;opacity:.35}
.sec-header{margin-bottom:22px;padding-bottom:14px;border-bottom:2px solid var(--sec-acc-soft,var(--pri-soft));position:relative;z-index:1}
.sec-num{display:inline-block;padding:4px 10px;background:linear-gradient(135deg,var(--sec-acc,var(--pri)),var(--sec-acc-d,var(--pri2)));color:#fff;border-radius:7px;font-family:'Unbounded',sans-serif;font-size:.78rem;font-weight:800;letter-spacing:.04em;margin-bottom:8px}
.sec-h{font-family:'Unbounded',sans-serif;font-size:1.6rem;font-weight:800;color:var(--sec-acc-d,var(--pri2));letter-spacing:-.01em;line-height:1.25}

.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px 20px;margin-bottom:16px;box-shadow:0 1px 3px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.04);position:relative;z-index:1;transition:transform .25s cubic-bezier(.16,1,.3,1),box-shadow .25s}
.card:hover{transform:translateY(-2px);box-shadow:0 4px 10px rgba(0,0,0,.06),0 16px 36px rgba(0,0,0,.08)}
.card-header{display:flex;align-items:center;gap:10px;margin-bottom:12px;padding-bottom:10px;border-bottom:1px dashed var(--border)}
.card-icon{width:32px;height:32px;border-radius:9px;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff}
.card-icon.repeat{background:#0ea5e9}.card-icon.theory{background:#8b5cf6}.card-icon.algo{background:#f59e0b}.card-icon.rule{background:#ec4899}.card-icon.example{background:#10b981}.card-icon.oral{background:#06b6d4}
.card-icon .ic{width:18px;height:18px}
.card-title{font-family:'Unbounded',sans-serif;font-size:.82rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);flex:1}
.card-num{font-size:.74rem;font-weight:700;color:var(--muted);background:var(--sec-acc-soft,var(--pri-soft));padding:3px 7px;border-radius:5px}
.card-body{font-size:.94rem;line-height:1.65}
.card-body p{margin-bottom:8px}
.card-body p:last-child{margin-bottom:0}

.btn{padding:8px 16px;border-radius:8px;background:var(--card);color:var(--text);border:1.5px solid var(--border);font-weight:600;font-size:.88rem;transition:background .15s,border-color .15s,transform .1s}
.btn:hover{background:var(--sec-acc-soft,var(--pri-soft));border-color:var(--sec-acc,var(--pri))}
.btn:active{transform:scale(.96)}
.btn.primary{background:var(--sec-acc,var(--pri));color:#fff;border-color:var(--sec-acc,var(--pri))}
.btn.primary:hover{background:var(--sec-acc-d,var(--pri2));border-color:var(--sec-acc-d,var(--pri2))}

.feedback{padding:10px 14px;border-radius:9px;font-weight:600;font-size:.88rem;margin-top:8px;display:none}
.feedback.ok{display:block;background:var(--ok-bg);color:#065f46;border-left:4px solid var(--ok)}
.feedback.fail{display:block;background:var(--fail-bg);color:#7f1d1d;border-left:4px solid var(--fail)}

.wg{background:linear-gradient(135deg,var(--card),var(--sec-acc-soft,var(--pri-soft)));border:1.5px solid var(--sec-acc,var(--pri));border-radius:14px;padding:18px 20px;margin-bottom:18px;box-shadow:var(--sh2);position:relative;z-index:1}
.wg-header{display:flex;align-items:center;gap:8px;margin-bottom:14px}
.wg-badge{padding:4px 9px;background:var(--sec-acc,var(--pri));color:#fff;border-radius:6px;font-family:'Unbounded',sans-serif;font-size:.68rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em}
.wg-title{font-family:'Unbounded',sans-serif;font-size:1.05rem;font-weight:800;color:var(--sec-acc-d,var(--pri2));flex:1}
.wg-help{font-size:.88rem;color:var(--text);margin-bottom:12px;line-height:1.55;background:linear-gradient(135deg,var(--warn-bg,#fef3c7),var(--sec-acc-soft,var(--pri-soft)));border-left:4px solid var(--warn,#f59e0b);padding:9px 14px;border-radius:9px}
.tinp{padding:8px 12px;border:1.5px solid var(--border);border-radius:8px;background:var(--card);color:var(--text);transition:border-color .15s;font-family:'JetBrains Mono',monospace}
.tinp:focus{outline:0;border-color:var(--sec-acc,var(--pri));box-shadow:0 0 0 3px var(--sec-acc-soft,var(--pri-soft))}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.sliders{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-bottom:10px}
.sliders label{display:block;font-size:.92rem;color:var(--muted);background:var(--card);padding:8px 12px;border-radius:8px;border:1px solid var(--border);line-height:1.5}
.sliders label b{font-family:'JetBrains Mono',monospace;font-size:1.05rem;color:var(--sec-acc-d,var(--pri2));margin-left:4px}
.sliders label input[type="range"]{display:block;width:100%;margin-top:6px;accent-color:var(--sec-acc,var(--pri))}
.score-display{display:flex;gap:14px;flex-wrap:wrap;align-items:center;padding:10px 14px;background:var(--sec-acc-soft,var(--pri-soft));border-radius:10px;margin-bottom:12px}
.score-display b{color:var(--sec-acc-d,var(--pri2));font-size:1.15rem}
.spoiler{border:1px solid var(--border);border-radius:10px;background:var(--card);margin:10px 0;overflow:hidden}
.spoiler summary{padding:8px 14px;background:var(--sec-acc-soft,var(--pri-soft));font-weight:700;cursor:pointer;font-size:.88rem;color:var(--sec-acc-d,var(--pri2));list-style:none;display:flex;align-items:center;gap:8px}
.spoiler summary::-webkit-details-marker{display:none}
.spoiler summary::before{content:'+';font-size:1.2rem;font-weight:900;color:var(--sec-acc,var(--pri));width:18px}
.spoiler[open] summary::before{content:'\\2212'}
.spoiler-body{padding:10px 14px;font-size:.92rem;line-height:1.6}

.dnd-pool{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;padding:10px;border:1.5px dashed var(--border);border-radius:10px;min-height:54px;transition:border-color .18s,background .18s}
.dnd-pool.over{border-color:var(--sec-acc,var(--pri));background:var(--sec-acc-soft,var(--pri-soft));border-style:solid}
.dnd-pool.col{flex-direction:column;align-items:stretch}
.dnd-pool.col .dnd-chip{width:auto}
.dnd-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:var(--card);border:1.5px solid var(--border);border-radius:10px;cursor:grab;user-select:none;font-size:.92rem;line-height:1.4;transition:transform .12s,box-shadow .12s,border-color .12s;touch-action:none;max-width:100%}
.dnd-chip:hover{transform:translateY(-1px);border-color:var(--sec-acc,var(--pri));box-shadow:var(--sh)}
.dnd-chip:active{cursor:grabbing}
.dnd-chip.armed{border-color:var(--sec-acc,var(--pri));background:var(--sec-acc-soft,var(--pri-soft));box-shadow:0 0 0 3px ${ch.color.pri_soft};transform:translateY(-1px)}
.dnd-chip.dragging{opacity:.28}
.dnd-chip.placed{background:var(--sec-acc-soft,var(--pri-soft));border-color:var(--sec-acc,var(--pri))}
.dnd-chip .dnd-x{padding:0 5px;color:var(--muted);font-weight:700;font-size:1.05rem;border-radius:4px;cursor:pointer}
.dnd-chip .dnd-x:hover{color:var(--bad,var(--fail));background:var(--fail-bg)}
.drop-box{background:var(--card);border:1.5px dashed var(--border);border-radius:10px;padding:10px;min-height:90px;transition:border-color .15s,background .15s}
.drop-box:hover{border-color:var(--sec-acc,var(--pri));background:var(--sec-acc-soft,var(--pri-soft))}
.drop-box h5{font-family:'Unbounded',sans-serif;font-size:.78rem;color:var(--sec-acc-d,var(--pri2));margin-bottom:8px;text-transform:uppercase;letter-spacing:.05em}
.drop-box.over{border-color:var(--sec-acc,var(--pri));background:var(--sec-acc-soft,var(--pri-soft));border-style:solid;transform:scale(1.015)}
.drop-items{display:flex;flex-wrap:wrap;gap:6px;min-height:32px}
.dnd-hint{font-size:.78rem;color:var(--muted);margin-bottom:8px;display:flex;align-items:center;gap:6px}
.dnd-hint svg{width:14px;height:14px;flex-shrink:0}

.col-side{position:sticky;top:14px;align-self:start;height:fit-content;max-height:calc(100vh - 28px);overflow-y:auto}
.sidecard{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px;margin-bottom:14px;box-shadow:var(--sh)}
.sidecard h4{font-family:'Unbounded',sans-serif;font-size:.74rem;font-weight:800;color:var(--pri2);text-transform:uppercase;letter-spacing:.07em;margin-bottom:10px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.sidecard-row{margin-bottom:8px;font-size:.86rem;line-height:1.6}
.sidecard-row b{color:var(--pri);font-weight:700}
.sidecard-row:last-child{margin-bottom:0}
@media(max-width:980px){.col-side{position:static;max-height:none}}

.xp-card{background:linear-gradient(135deg,var(--acc-soft),var(--pri-soft));border:1.5px solid var(--acc);border-radius:12px;padding:14px;margin-bottom:14px}
.xp-card-title{font-size:.68rem;font-weight:800;color:var(--acc2);text-transform:uppercase;letter-spacing:.07em;margin-bottom:8px;display:flex;align-items:center;justify-content:space-between}
.xp-level{font-size:1.1rem;font-weight:900;color:var(--acc2);font-family:'Unbounded',sans-serif}
.xp-bar{height:9px;background:rgba(0,0,0,.10);border-radius:6px;overflow:hidden;margin:7px 0}
.xp-fill{height:100%;background:linear-gradient(90deg,var(--acc),var(--pri));border-radius:6px;transition:width .5s cubic-bezier(.4,0,.2,1)}
.xp-nums{font-size:.74rem;color:var(--muted);display:flex;justify-content:space-between}

.sec-nav{display:flex;gap:10px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);justify-content:space-between;flex-wrap:wrap}
.foot{text-align:center;padding:30px 16px;color:var(--muted);font-size:.78rem;border-top:1px solid var(--border);margin-top:30px}

.ach-popup{position:fixed;top:80px;right:18px;background:linear-gradient(135deg,var(--pri),var(--acc));color:#fff;padding:12px 18px;border-radius:11px;font-weight:700;font-size:.9rem;box-shadow:0 8px 28px rgba(0,0,0,.32);z-index:1002;display:none;align-items:center;gap:8px;max-width:340px}
.ach-popup.show{display:flex}

.col-side-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.42);z-index:9990;display:none}
.col-side-backdrop.show{display:block}
@media(max-width:980px){
  .col-side{position:fixed;top:0;right:0;height:100vh;width:300px;max-width:88vw;background:var(--bg);box-shadow:-12px 0 24px rgba(0,0,0,.18);padding:18px 16px;overflow-y:auto;transform:translateX(100%);transition:transform .25s ease;z-index:9991;max-height:none}
  .col-side.open{transform:none}
}

.search-modal{position:fixed;inset:0;background:rgba(15,23,42,.55);backdrop-filter:blur(4px);z-index:9993;display:none;align-items:flex-start;justify-content:center;padding-top:14vh}
.search-modal.show{display:flex}
.search-box{background:var(--bg);border:1px solid var(--border);border-radius:14px;width:560px;max-width:92vw;max-height:70vh;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 24px 64px rgba(0,0,0,.4)}
.search-input{padding:14px 16px;font-size:1rem;border:0;border-bottom:1px solid var(--border);background:transparent;color:var(--text);outline:none}
.search-results{flex:1;overflow-y:auto;padding:6px 0}
.search-row{display:block;padding:8px 16px;cursor:pointer;border-bottom:1px solid var(--border);text-align:left;background:transparent;border:0;width:100%;color:var(--text)}
.search-row:hover,.search-row.active{background:var(--sec-acc-soft,var(--pri-soft))}
.search-row .sr-kind{font-size:.7rem;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:2px}
.search-row .sr-title{font-weight:700;font-size:.92rem;color:var(--text)}
.search-row .sr-desc{font-size:.8rem;color:var(--muted);margin-top:2px}
.search-empty{padding:20px;text-align:center;color:var(--muted);font-size:.88rem}
.search-foot{padding:8px 14px;border-top:1px solid var(--border);font-size:.74rem;color:var(--muted);display:flex;gap:14px}
.search-foot kbd{padding:2px 6px;background:var(--card);border:1px solid var(--border);border-radius:4px;font-family:'JetBrains Mono',monospace;font-size:.72rem}

/* === GEOM11 POLISH === */
@keyframes wgFadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.sec.active .wg{animation:wgFadeIn .35s cubic-bezier(.16,1,.3,1) backwards}
.sec.active .wg:nth-of-type(1){animation-delay:.02s}
.sec.active .wg:nth-of-type(2){animation-delay:.08s}
.sec.active .wg:nth-of-type(3){animation-delay:.14s}
.sec.active .wg:nth-of-type(4){animation-delay:.20s}
.sec.active .wg:nth-of-type(5){animation-delay:.26s}
.sec.active .wg:nth-of-type(6){animation-delay:.32s}
.wg svg{transition:filter .25s ease}
.wg:hover svg{filter:drop-shadow(0 4px 16px rgba(0,0,0,.10))}
input[type=range]:active{box-shadow:0 0 0 4px var(--pri-soft);border-radius:8px}
.wg input[type=range]{cursor:ew-resize}
.score-display b{transition:transform .22s cubic-bezier(.16,1,.3,1),color .22s;display:inline-block;transform-origin:center}
.score-display b.bump{transform:scale(1.28);color:var(--pri)}
.katex{transition:color .2s}
.wg-help .katex:hover,.card-body .katex:hover{color:var(--pri2,var(--pri));cursor:help}
.hp-fill,.psel-prog-fill,.xp-fill,[id$="-overall-fill"]{transition:width .6s cubic-bezier(.16,1,.3,1)!important}
.boss-card,.btn.primary,.btn-primary{position:relative;overflow:hidden}
.btn.primary::after,.btn-primary::after{content:'';position:absolute;inset:0;background:radial-gradient(circle at center,rgba(255,255,255,.42) 0%,transparent 60%);opacity:0;transition:opacity .25s;pointer-events:none}
.btn.primary:hover::after,.btn-primary:hover::after{opacity:1}
.psel-card{position:relative}
.psel-card .psel-done{position:absolute;top:6px;right:6px;width:18px;height:18px;border-radius:50%;background:#10b981;display:none;align-items:center;justify-content:center;box-shadow:0 2px 6px rgba(16,185,129,.45);z-index:2}
.psel-card .psel-done svg{width:11px;height:11px;stroke:#fff;fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.psel-card.done .psel-done{display:flex}
.sec{transition:opacity .25s}

/* g3d toolbar */
.g3d-tools{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}
.g3d-tools .btn{padding:5px 10px;font-size:.78rem}
.stub-note{padding:18px 22px;background:linear-gradient(135deg,var(--pri-soft),var(--sec-acc-soft));border:1.5px dashed var(--pri);border-radius:13px;text-align:center;color:var(--text);margin-bottom:14px}
.stub-note h3{font-family:'Unbounded',sans-serif;color:var(--pri2);margin-bottom:8px;font-size:1.05rem}
.stub-note p{color:var(--muted);font-size:.9rem;line-height:1.55}
</style>
</head>
<body>

<header class="hdr">
  <div class="hdr-row">
    <div>
      <h1>${HDR_H1}</h1>
      <div class="hdr-sub">${ch.hdr_sub}</div>
    </div>
    <div class="hdr-side">
      <a href="/textbook/geometry-11" class="hdr-btn"><svg class="ic" viewBox="0 0 24 24"><polyline points="15 18 9 12 15 6"/></svg> К геометрии 11</a>
      <button id="search-btn" class="hdr-btn"><svg class="ic" viewBox="0 0 24 24"><circle cx="11" cy="11" r="7"/><path d="m21 21-4-4"/></svg> Поиск</button>
      <button id="sidebar-btn" class="hdr-btn"><svg class="ic" viewBox="0 0 24 24"><line x1="4" y1="6" x2="20" y2="6"/><line x1="4" y1="12" x2="20" y2="12"/><line x1="4" y1="18" x2="14" y2="18"/></svg> Шпаргалка</button>
      <button id="theme-btn" class="hdr-btn"><svg class="ic" viewBox="0 0 24 24"><path d="M21 12.8A9 9 0 1 1 11.2 3a7 7 0 0 0 9.8 9.8z"/></svg><span id="theme-lab">Тёмная</span></button>
    </div>
  </div>
</header>

<main class="main">
  <div class="col-main">

    <section class="hero">
      <h2>${ch.hero_h2}</h2>
      <p>${ch.hero_p}</p>
      <div class="hero-row">
        <button class="btn-primary" onclick="goTo('${ch.paras[0].id}')"><svg class="ic" viewBox="0 0 24 24"><polygon points="6 4 20 12 6 20 6 4" fill="currentColor" stroke="none"/></svg> Начать ${ch.paras[0].num}</button>
        <div class="hero-progress">
          <span class="hp-label">Прогресс по разделу</span>
          <div class="hp-bar"><div id="hero-hp-fill" class="hp-fill"></div></div>
          <span id="hero-hp-text" class="hp-text">0%</span>
        </div>
        <div id="hero-xp-badge" class="hero-xp-badge"></div>
      </div>
    </section>

    <section class="psel">
      <div class="psel-title">Параграфы раздела</div>
      <div id="psel-grid" class="psel-grid"></div>
    </section>

${SEC_HTML}

  </div>
  <aside class="col-side" id="col-side"><div id="sidebar-content"></div></aside>
  <div class="col-side-backdrop" id="col-side-backdrop"></div>
</main>

<footer class="foot">Интерактивный учебник «Геометрия 11» · Раздел ${ch.n} · «${ch.title}» · LearnSpace</footer>

<div id="ach-popup" class="ach-popup"><svg class="ic" viewBox="0 0 24 24" style="width:22px;height:22px"><polygon points="12,2 22,20 2,20"/></svg><span id="ach-text">Достижение!</span></div>
<div id="search-modal" class="search-modal" role="dialog">
  <div class="search-box">
    <input type="text" id="search-input" class="search-input" placeholder="Поиск…" autocomplete="off">
    <div id="search-results" class="search-results"></div>
    <div class="search-foot"><span><kbd>↑↓</kbd> навигация</span><span><kbd>Enter</kbd> открыть</span><span><kbd>Esc</kbd> закрыть</span></div>
  </div>
</div>

<script>
'use strict';

const STATE = { current:'${ch.paras[0].id}', progress:{}, achievements:new Map(), xp:0, level:1 };
const TOTAL_PARAS = ${TOTAL_PARAS};
const _TB_SLUG = '${SLUG}';

const PARAS = [
${PARAS_JS}
];
PARAS.forEach(p => { STATE.progress[p.id] = 0; });

function calcLevel(xp){ return Math.floor(Math.sqrt((xp||0)/100))+1; }
function _xpForLevel(lv){ return (lv-1)*(lv-1)*100; }

const ACH_LABELS = {
${ACH_LABELS_JS}
};

function loadProgress(){
  try{
    const s=localStorage.getItem('geometry11_ch${ch.n}_progress'); if(s) Object.assign(STATE.progress, JSON.parse(s));
    const a=localStorage.getItem('geometry11_ch${ch.n}_achievements');
    if(a){ const p=JSON.parse(a); if(Array.isArray(p)) p.forEach(id=>STATE.achievements.set(id, ACH_LABELS[id]||id)); else if(p&&typeof p==='object'){ for(const[id,t] of Object.entries(p)) STATE.achievements.set(id,(t&&t!==id)?t:(ACH_LABELS[id]||id)); } }
    STATE.xp=+(localStorage.getItem('geometry11_xp')||0); STATE.level=calcLevel(STATE.xp);
  }catch(e){}
}
function saveProgress(){
  try{
    localStorage.setItem('geometry11_ch${ch.n}_progress', JSON.stringify(STATE.progress));
    localStorage.setItem('geometry11_ch${ch.n}_achievements', JSON.stringify(Object.fromEntries(STATE.achievements)));
    localStorage.setItem('geometry11_xp', String(STATE.xp));
  }catch(e){}
}
function bumpProgress(key, delta){
  STATE.progress[key]=Math.max(0,Math.min(100,(STATE.progress[key]||0)+delta));
  saveProgress(); refreshProgressUI();
  if(STATE.progress[key]>=50) markParaRead(key);
}

const _markedRead=new Set();
let _pendingProgressBody=null, _progressTimer=null;
function _flushProgress(){
  const body=_pendingProgressBody; _pendingProgressBody=null; if(!body) return;
  const tok=(window.LS&&LS.getToken)?LS.getToken():''; if(!tok) return;
  fetch('/api/textbooks/'+_TB_SLUG+'/progress',{method:'POST',headers:{'Content-Type':'application/json','Authorization':'Bearer '+tok},body:JSON.stringify(body),keepalive:true}).catch(()=>{});
}
function _queueProgress(patch){ _pendingProgressBody=Object.assign(_pendingProgressBody||{},patch); if(_progressTimer) clearTimeout(_progressTimer); _progressTimer=setTimeout(_flushProgress, 600); }
function markLastPara(id){ _queueProgress({last_para:id}); }
function markParaRead(id){ if(_markedRead.has(id)) return; _markedRead.add(id); _queueProgress({mark_read:id}); }
window.addEventListener('beforeunload', _flushProgress);
function loadServerReadState(){
  const tok=(window.LS&&LS.getToken)?LS.getToken():''; if(!tok) return;
  fetch('/api/textbooks/'+_TB_SLUG,{headers:{'Authorization':'Bearer '+tok}}).then(r=>r.ok?r.json():null).then(d=>{
    if(!d||!d.progress) return;
    (d.progress.read||[]).forEach(k=>{_markedRead.add(k); if((STATE.progress[k]||0)<50) STATE.progress[k]=100;});
    saveProgress(); refreshProgressUI();
  }).catch(()=>{});
}

function addXp(n,src){
  if(!n) return;
  const prev=STATE.level; STATE.xp=Math.max(0,(STATE.xp||0)+n); STATE.level=calcLevel(STATE.xp);
  saveProgress(); refreshProgressUI();
  if(window.LS&&window.LS.xp) window.LS.xp.add(n,'geometry11-ch${ch.n}-'+(src||'misc'));
  if(STATE.level>prev){
    const pop=document.getElementById('ach-popup');
    if(pop){ document.getElementById('ach-text').textContent='Уровень '+STATE.level+'!'; pop.classList.add('show'); setTimeout(()=>pop.classList.remove('show'),2600); }
  }
}

function refreshProgressUI(){
  const total=Math.round(Object.values(STATE.progress).reduce((a,b)=>a+b,0)/TOTAL_PARAS);
  const f=document.getElementById('hero-hp-fill'); if(f) f.style.width=total+'%';
  const t=document.getElementById('hero-hp-text'); if(t) t.textContent=total+'% пройдено';
  document.querySelectorAll('[data-prog-card]').forEach(el=>{ const k=el.dataset.progCard; const fl=el.querySelector('.psel-prog-fill'); if(fl) fl.style.width=(STATE.progress[k]||0)+'%'; });
  const xpBadge=document.getElementById('hero-xp-badge');
  if(xpBadge){ xpBadge.innerHTML='<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" style="width:13px;height:13px"><polygon points="12 2 22 20 2 20"/></svg> Ур. '+STATE.level+' \\xb7 '+(STATE.xp||0)+' XP'; }
  if(STATE.current && document.getElementById('sidebar-content')){ try{ buildSidebar(STATE.current); }catch(e){} }
}

function achievement(id,text){
  if(STATE.achievements.has(id)) return;
  STATE.achievements.set(id, text||ACH_LABELS[id]||id); saveProgress();
  const pop=document.getElementById('ach-popup');
  if(pop){ document.getElementById('ach-text').textContent=text||ACH_LABELS[id]||id; pop.classList.add('show'); setTimeout(()=>pop.classList.remove('show'),3300); }
  addXp(20,'ach-'+id);
}

function buildParaSelector(){
  const g=document.getElementById('psel-grid'); g.innerHTML='';
  PARAS.forEach(p=>{
    const card=document.createElement('div');
    card.className='psel-card'+(p.final?' final':'');
    card.dataset.id=p.id; card.dataset.progCard=p.id;
    card.innerHTML='<div class="psel-num">'+p.num+'</div><div class="psel-name">'+p.name+'</div><div class="psel-prog"><div class="psel-prog-fill"></div></div>';
    card.addEventListener('click', ()=>goTo(p.id));
    g.appendChild(card);
  });
}

const BUILT=new Set();
const BUILDERS = { ${BUILDERS_JS} };
function ensureBuilt(id){ if(BUILT.has(id)) return; const fn=BUILDERS[id]; if(fn){ fn(); BUILT.add(id); } }
function goTo(id){
  STATE.current=id; ensureBuilt(id);
  document.querySelectorAll('.sec').forEach(s=>s.classList.remove('active'));
  const el=document.getElementById('sec-'+id); if(el) el.classList.add('active');
  document.querySelectorAll('.psel-card').forEach(c=>c.classList.toggle('active', c.dataset.id===id));
  buildSidebar(id);
  window.scrollTo({top:0,behavior:'smooth'});
  if((STATE.progress[id]||0)<10) bumpProgress(id, 10);
  if(window.renderMathInElement) setTimeout(()=>renderMath(el), 0);
  markLastPara(id);
}

const SIDEBARS = {
${SIDEBARS_JS}
};

const TIPS=[
${TIPS_JS}
];

function buildSidebar(id){
  const box=document.getElementById('sidebar-content');
  const sb=SIDEBARS[id]||SIDEBARS[PARAS[0].id];
  let html='';
  const xpForLv=_xpForLevel(STATE.level), xpNext=_xpForLevel(STATE.level+1);
  const xpInLv=STATE.xp-xpForLv, xpRange=xpNext-xpForLv;
  const xpPct=xpRange>0?Math.round(xpInLv/xpRange*100):100;
  html+='<div class="xp-card"><div class="xp-card-title"><span>XP-прогресс</span><span class="xp-level">Ур. '+STATE.level+'</span></div><div class="xp-bar"><div class="xp-fill" style="width:'+xpPct+'%"></div></div><div class="xp-nums"><span>'+STATE.xp+' XP</span><span>'+xpNext+' XP</span></div></div>';
  html+='<div class="sidecard"><h4>'+sb.title+'</h4>';
  sb.rows.forEach(([k,v])=>{ html+='<div class="sidecard-row"><b>'+k+'</b>'+(v?' \\u2014 '+v:'')+'</div>'; });
  html+='</div>';
  const tip=TIPS.find(t=>t.sec===id)||TIPS[0];
  if(tip){
    html+='<div class="sidecard" style="background:linear-gradient(135deg,var(--warn-bg,#fef3c7),var(--pri-soft));border-color:var(--warn,#f59e0b)"><h4 style="color:#92400e;display:flex;align-items:center;gap:6px"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" style="width:14px;height:14px"><polygon points="12,2 22,20 2,20"/></svg>Подсказка</h4><div class="sidecard-row" style="margin-bottom:0;font-size:.84rem;line-height:1.55">'+tip.html+'</div></div>';
  }
  if(STATE.achievements.size>0){
    html+='<div class="sidecard"><h4>Достижения <span style="color:var(--warn);float:right">'+STATE.achievements.size+'</span></h4>';
    [...STATE.achievements.values()].slice(-4).forEach(text=>{ html+='<div class="sidecard-row" style="font-size:.78rem;color:var(--ok)">&#10003; '+text+'</div>'; });
    html+='</div>';
  }
  box.innerHTML=html;
  if(window.renderMathInElement) try{ renderMath(box); }catch(e){}
}

function initTheme(){
  const t=localStorage.getItem('geometry11_ch${ch.n}_theme')||'light';
  if(t==='dark') document.documentElement.classList.add('dark');
  document.getElementById('theme-lab').textContent=t==='dark'?'Светлая':'Тёмная';
  document.getElementById('theme-btn').addEventListener('click', ()=>{
    document.documentElement.classList.toggle('dark');
    const dark=document.documentElement.classList.contains('dark');
    localStorage.setItem('geometry11_ch${ch.n}_theme', dark?'dark':'light');
    document.getElementById('theme-lab').textContent=dark?'Светлая':'Тёмная';
  });
}

function renderMath(root){ if(window.renderMathInElement){ try{ renderMathInElement(root, {delimiters:[{left:'$$',right:'$$',display:true},{left:'$',right:'$',display:false},{left:'\\\\[',right:'\\\\]',display:true},{left:'\\\\(',right:'\\\\)',display:false}],throwOnError:false}); }catch(e){} } }
function feedback(elm, ok, text){ if(!elm) return; elm.className='feedback '+(ok?'ok':'fail'); elm.innerHTML=text||(ok?'&#10003; Верно!':'&#10007; Неверно'); elm.style.display='block'; try{renderMath(elm);}catch(e){} }
function fmt(n){ if(!isFinite(n)) return '?'; if(Number.isInteger(n)) return String(n); return Math.abs(n-Math.round(n))<1e-9?String(Math.round(n)):(+n.toFixed(6)).toString(); }
function ipow(base, exp){ let r=1; for(let i=0;i<Math.abs(exp);i++) r*=base; return exp<0 ? 1/r : r; }
function gcd(a,b){ a=Math.abs(a|0); b=Math.abs(b|0); while(b){ const t=b; b=a%b; a=t; } return a||1; }
function makeCard(kind, title, num, body){
  const labels = {repeat:'Повторение',theory:'Теория',algo:'Алгоритм',rule:'Правило',example:'Пример',oral:'Устно'};
  return '<div class="card"><div class="card-header"><div class="card-icon '+kind+'">'+ICONS[kind]+'</div><div class="card-title">'+(labels[kind]||'')+(title&&title!==labels[kind]?' \\xb7 '+title:'')+'</div>'+(num?'<div class="card-num">'+num+'</div>':'')+'</div><div class="card-body">'+body+'</div></div>';
}
function setupSorter(cfg){
  const placed = {}; const pool = document.getElementById(cfg.poolId); const scope = document.querySelector(cfg.scopeSelector);
  if(!pool||!scope) return {placed,render:()=>{},reset:()=>{}};
  pool.classList.add('dnd-pool'); if(cfg.columnLayout) pool.classList.add('col');
  let armed = null;
  function buildChip(it,isPlaced){ const e=document.createElement('div'); e.className='dnd-chip'+(isPlaced?' placed':''); e.dataset.id=it.id; e.innerHTML='<span class="dnd-txt">'+it.html+'</span><span class="dnd-x" title="Убрать">\\xd7</span>'; attach(e,it.id); return e; }
  function attach(elm,itId){ let ghost=null,dragging=false,sx=0,sy=0; elm.addEventListener('pointerdown',ev=>{ if(ev.button!==undefined&&ev.button!==0) return;
          ev.preventDefault(); if(ev.target.classList&&ev.target.classList.contains('dnd-x')){ ev.stopPropagation(); if(placed[itId]){delete placed[itId];render();}else if(armed===itId){armed=null;render();} return; } sx=ev.clientX;sy=ev.clientY; const r=elm.getBoundingClientRect(); const ox=ev.clientX-r.left,oy=ev.clientY-r.top; try{elm.setPointerCapture(ev.pointerId);}catch(e){} function onMove(e){ const dx=e.clientX-sx,dy=e.clientY-sy; if(!dragging&&Math.hypot(dx,dy)>8){ dragging=true; ghost=elm.cloneNode(true); ghost.classList.remove('armed'); ghost.style.cssText='position:fixed;z-index:9999;pointer-events:none;opacity:.9;transform:rotate(-2.5deg);box-shadow:0 14px 36px rgba(0,0,0,.32);width:'+r.width+'px;left:'+(e.clientX-ox)+'px;top:'+(e.clientY-oy)+'px'; document.body.appendChild(ghost); elm.classList.add('dragging'); } if(dragging&&ghost){ ghost.style.left=(e.clientX-ox)+'px';ghost.style.top=(e.clientY-oy)+'px'; const under=document.elementsFromPoint(e.clientX,e.clientY); scope.querySelectorAll('.drop-box.over,.dnd-pool.over').forEach(n=>n.classList.remove('over')); const tgt=under.find(n=>n.classList&&(n.classList.contains('drop-box')||n.classList.contains('dnd-pool'))); if(tgt)tgt.classList.add('over'); } } function onUp(e){ elm.removeEventListener('pointermove',onMove);elm.removeEventListener('pointerup',onUp);elm.removeEventListener('pointercancel',onUp);elm.classList.remove('dragging'); if(ghost){ghost.remove();ghost=null;} scope.querySelectorAll('.drop-box.over,.dnd-pool.over').forEach(n=>n.classList.remove('over')); if(dragging){ const under=document.elementsFromPoint(e.clientX,e.clientY); const box=under.find(n=>n.classList&&n.classList.contains('drop-box')); const pl=under.find(n=>n.classList&&n.classList.contains('dnd-pool')); if(box){const di=box.querySelector('[data-cat]');if(di){placed[itId]=di.dataset.cat;armed=null;render();return;}}else if(pl){delete placed[itId];armed=null;render();return;} }else{ if(placed[itId]){delete placed[itId];armed=null;render();}else{armed=(armed===itId)?null:itId;render();} } dragging=false; } elm.addEventListener('pointermove',onMove);elm.addEventListener('pointerup',onUp);elm.addEventListener('pointercancel',onUp); }); }
  function attachBoxTaps(){ scope.querySelectorAll('.drop-box').forEach(box=>{ box.addEventListener('click',ev=>{ if(!armed)return; if(ev.target.closest('.dnd-chip'))return; const di=box.querySelector('[data-cat]'); if(di){placed[armed]=di.dataset.cat;armed=null;render();} }); }); }
  function render(){ pool.innerHTML=''; cfg.items.forEach(it=>{if(placed[it.id])return;const c=buildChip(it,false);if(armed===it.id)c.classList.add('armed');pool.appendChild(c);}); cfg.cats.forEach(cat=>{const box=scope.querySelector('.drop-items[data-cat="'+cat+'"]');if(!box)return;box.innerHTML='';cfg.items.forEach(it=>{if(placed[it.id]!==cat)return;box.appendChild(buildChip(it,true));});}); if(window.renderMathInElement)try{renderMath(scope);}catch(_){} }
  attachBoxTaps(); render();
  return {placed,render,reset(){ for(const k in placed)delete placed[k];armed=null;render(); }};
}

/* === SVG-хелперы 2D (axes, plotFunc, pointWithDrop, asymptote, snapToValue, геом.) === */

function axes2D(W, H, pad, xmin, xmax, ymin, ymax){
  const ux = (W - 2*pad) / (xmax - xmin);
  const uy = (H - 2*pad) / (ymax - ymin);
  const toX = v => pad + (v - xmin) * ux;
  const toY = v => H - pad - (v - ymin) * uy;
  let g = '';
  g += '<g stroke="#e5e7eb" stroke-width="1">';
  for (let x = Math.ceil(xmin); x <= xmax; x++){
    g += '<line x1="'+toX(x)+'" y1="'+pad+'" x2="'+toX(x)+'" y2="'+(H-pad)+'"/>';
  }
  for (let y = Math.ceil(ymin); y <= ymax; y++){
    g += '<line x1="'+pad+'" y1="'+toY(y)+'" x2="'+(W-pad)+'" y2="'+toY(y)+'"/>';
  }
  g += '</g>';
  const y0 = toY(0), x0 = toX(0);
  g += '<line x1="'+pad+'" y1="'+y0+'" x2="'+(W-pad)+'" y2="'+y0+'" stroke="#0f172a" stroke-width="1.5"/>';
  g += '<line x1="'+x0+'" y1="'+pad+'" x2="'+x0+'" y2="'+(H-pad)+'" stroke="#0f172a" stroke-width="1.5"/>';
  g += '<text x="'+(W-pad+2)+'" y="'+(y0-4)+'" font-size="11" fill="#0f172a">x</text>';
  g += '<text x="'+(x0+4)+'" y="'+(pad-2)+'" font-size="11" fill="#0f172a">y</text>';
  g += '<g font-size="10" fill="#64748b">';
  for (let x = Math.ceil(xmin); x <= xmax; x++){
    if (x !== 0) g += '<text x="'+(toX(x)-3)+'" y="'+(y0+12)+'">'+x+'</text>';
  }
  for (let y = Math.ceil(ymin); y <= ymax; y++){
    if (y !== 0) g += '<text x="'+(x0+4)+'" y="'+(toY(y)+3)+'">'+y+'</text>';
  }
  g += '<text x="'+(x0+4)+'" y="'+(y0+12)+'">0</text>';
  g += '</g>';
  return { content: g, toX, toY, ux, uy };
}

function plotFunc(f, xmin, xmax, toX, toY, color, N){
  N = N || 200;
  let d = '';
  let prevValid = false;
  for (let i = 0; i <= N; i++){
    const x = xmin + (xmax - xmin) * i / N;
    let y;
    try { y = f(x); } catch(e){ y = NaN; }
    if (!isFinite(y) || isNaN(y) || y < -1e4 || y > 1e4){ prevValid = false; continue; }
    d += (prevValid ? ' L' : ' M') + toX(x).toFixed(2) + ',' + toY(y).toFixed(2);
    prevValid = true;
  }
  return '<path d="'+d+'" stroke="'+color+'" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"/>';
}

function pointWithDrop(x, fx, toX, toY, color, label){
  const px = toX(x), py = toY(fx);
  let s = '';
  s += '<line x1="'+px+'" y1="'+py+'" x2="'+px+'" y2="'+toY(0)+'" stroke="'+color+'" stroke-width="1.2" stroke-dasharray="3 3" opacity=".7"/>';
  s += '<line x1="'+px+'" y1="'+py+'" x2="'+toX(0)+'" y2="'+py+'" stroke="'+color+'" stroke-width="1.2" stroke-dasharray="3 3" opacity=".7"/>';
  s += '<circle cx="'+px+'" cy="'+py+'" r="4.5" fill="'+color+'" stroke="#fff" stroke-width="2"/>';
  if (label){
    s += '<text x="'+(px+8)+'" y="'+(py-8)+'" font-family="Inter,sans-serif" font-size="12" font-weight="700" fill="'+color+'">'+label+'</text>';
  }
  return s;
}

function asymptote(orientation, value, toX, toY, xmin, xmax, ymin, ymax, color){
  color = color || '#94a3b8';
  if (orientation === 'h'){
    const y = toY(value);
    return '<line x1="'+toX(xmin)+'" y1="'+y+'" x2="'+toX(xmax)+'" y2="'+y+'" stroke="'+color+'" stroke-width="1.3" stroke-dasharray="6 4"/>';
  } else {
    const x = toX(value);
    return '<line x1="'+x+'" y1="'+toY(ymin)+'" x2="'+x+'" y2="'+toY(ymax)+'" stroke="'+color+'" stroke-width="1.3" stroke-dasharray="6 4"/>';
  }
}

function snapToValue(value, snapPoints, tolerance){
  tolerance = tolerance || 0.1;
  for (const sp of snapPoints){
    if (Math.abs(value - sp) < tolerance) return sp;
  }
  return value;
}

function rightAngleMark(V, uIn, wIn, s){
  s = s || 9;
  const p1 = {x: V.x + s*uIn.x, y: V.y + s*uIn.y};
  const c  = {x: p1.x + s*wIn.x, y: p1.y + s*wIn.y};
  const p2 = {x: V.x + s*wIn.x, y: V.y + s*wIn.y};
  return p1.x+','+p1.y+' '+c.x+','+c.y+' '+p2.x+','+p2.y;
}
function angleArcAuto(V, uA, uB, R){
  const sA = {x: V.x + R*uA.x, y: V.y + R*uA.y};
  const eB = {x: V.x + R*uB.x, y: V.y + R*uB.y};
  const cross = uA.x*uB.y - uA.y*uB.x;
  const sweep = cross > 0 ? 1 : 0;
  return 'M'+sA.x+','+sA.y+' A'+R+','+R+' 0 0,'+sweep+' '+eB.x+','+eB.y;
}
function unitVec(p1, p2){
  const dx = p2.x - p1.x, dy = p2.y - p1.y;
  const len = Math.sqrt(dx*dx + dy*dy) || 1;
  return {x: dx/len, y: dy/len};
}
function deg2rad(d){ return d * Math.PI / 180; }

const ICONS = {
  repeat:'<svg class="ic" viewBox="0 0 24 24"><polyline points="9 11 12 14 22 4"/><path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"/></svg>',
  theory:'<svg class="ic" viewBox="0 0 24 24"><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></svg>',
  algo:'<svg class="ic" viewBox="0 0 24 24"><polyline points="17 11 21 7 17 3"/><line x1="21" y1="7" x2="9" y2="7"/><polyline points="7 13 3 17 7 21"/><line x1="3" y1="17" x2="15" y2="17"/></svg>',
  rule:'<svg class="ic" viewBox="0 0 24 24"><path d="M6 8a6 6 0 0 1 12 0c0 7 3 9 3 9H3s3-2 3-9"/><path d="M10.3 21a1.94 1.94 0 0 0 3.4 0"/></svg>',
  example:'<svg class="ic" viewBox="0 0 24 24"><path d="M9 18h6"/><path d="M10 22h4"/><path d="M12 2a7 7 0 0 0-4 13c1 1 2 2 2 4h4c0-2 1-3 2-4a7 7 0 0 0-4-13z"/></svg>',
  oral:'<svg class="ic" viewBox="0 0 24 24"><circle cx="12" cy="12" r="10"/><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"/><line x1="12" y1="17" x2="12.01" y2="17"/></svg>',
};

function secNavFor(curId){
  const idx = PARAS.findIndex(p => p.id === curId);
  const prev = idx > 0 ? PARAS[idx-1].id : null;
  const next = idx < PARAS.length - 1 ? PARAS[idx+1].id : null;
  return secNav(prev, next);
}
function secNav(prev, next){
  const NAMES = {${NAMES_JS}};
  let h='<div class="sec-nav">';
  h+=prev?'<button class="btn" onclick="goTo(\\''+prev+'\\')"><svg class="ic" viewBox="0 0 24 24"><polyline points="15 18 9 12 15 6"/></svg> '+NAMES[prev]+'</button>':'<span></span>';
  h+=next?'<button class="btn primary" onclick="goTo(\\''+next+'\\')">'+NAMES[next]+' <svg class="ic" viewBox="0 0 24 24"><polyline points="9 18 15 12 9 6"/></svg></button>':'<span></span>';
  h+='</div>'; return h;
}

function readButton(paraId){
  const p = PARAS.find(x => x.id === paraId);
  const labelTail = p && p.final ? 'финал' : (p ? p.num : '\\xA7?');
  return '<div style="margin-top:18px;display:flex;justify-content:center">'
    +'<button class="btn primary" id="'+paraId+'-read-btn">'
    +'<svg class="ic" viewBox="0 0 24 24"><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></svg>'
    +' Я прочитал — '+labelTail+' (+10 XP)'
    +'</button></div>';
}
function wireReadBtn(paraId){
  const btn = document.getElementById(paraId+'-read-btn'); if(!btn) return;
  btn.addEventListener('click', ()=>{
    addXp(10, paraId+'-read'); bumpProgress(paraId, 30);
    btn.textContent='Прочитано! +10 XP'; btn.disabled=true; btn.style.opacity=.6;
    const aId = paraId+'_done';
    if(ACH_LABELS[aId]) achievement(aId);
  });
}

/* ===== STUB BUILDER — единый для всех параграфов раздела (Phase 0) ===== */

function buildStub(id){
  const p = PARAS.find(x => x.id === id);
  if(!p) return;
  const box = document.getElementById(id + '-body');
  if(!box) return;
  let html = '';

  html += '<div class="stub-note">'
        + '<h3>' + p.num + ' «' + p.name + '» — в разработке</h3>'
        + '<p>Это параграф раздела ' + ${ch.n} + '. Полное наполнение (теория + 3 интерактива + DnD + тренажёр) появится в Phase 1+. Сейчас доступны только базовая навигация, прогресс-бар и подсказка в боковой панели.</p>'
        + '</div>';

  html += makeCard('theory', 'План параграфа', p.num, '<p>Тема: <b>' + p.name + '</b>.</p>' + (p.sub ? '<p>Ключевая формула: ' + p.sub + '</p>' : '') + '<p>Содержание будет реализовано в следующих фазах разработки.</p>');

  /* Демо-интерактив с G3D (если доступен) — показываем разработчику, что движок работает */
  if(window.G3D && !p.final){
    html += '<div class="wg" id="' + id + '-iv-demo">'
          + '<div class="wg-header"><span class="wg-badge">DEMO 3D</span><div class="wg-title">Превью мини-3D движка</div></div>'
          + '<div class="wg-help">Скелет-демо: тело можно вращать мышью. В Phase 1+ здесь появятся полноценные интерактивы с сечениями, развёртками и формулами.</div>'
          + '<div class="g3d-tools">'
          +   '<button class="btn" data-view="iso">Изо</button>'
          +   '<button class="btn" data-view="front">Спереди</button>'
          +   '<button class="btn" data-view="top">Сверху</button>'
          +   '<button class="btn" data-view="side">Сбоку</button>'
          + '</div>'
          + '<div style="background:var(--card);border-radius:9px;padding:10px;text-align:center"><svg id="' + id + '-iv-svg" viewBox="0 0 480 360" width="100%" style="max-width:480px;height:auto"></svg></div>'
          + '</div>';
  }

  html += secNavFor(id);
  html += readButton(id);

  box.innerHTML = html;
  renderMath(box);

  /* Установка демо-3D */
  if(window.G3D && !p.final){
    const svg = document.getElementById(id + '-iv-svg');
    if(svg){
      const scene = G3D.createScene({W:480, H:360, scale:42, camDist:8, rotX:-0.35, rotY:0.7});
      /* выбираем фигуру по id параграфа */
      let mesh;
      if(id === 'p1') mesh = G3D.prismMesh(4, 1.6, 2.4);       /* куб/призма */
      else if(id === 'p2') mesh = G3D.cylinderMesh(1.5, 2.6, 32);
      else if(id === 'p3') mesh = G3D.pyramidMesh(4, 1.8, 2.6);
      else if(id === 'p4') mesh = G3D.coneMesh(1.5, 2.6, 32);
      else if(id === 'p5' || id === 'p6') mesh = null; /* сфера — отдельный wireframe */
      else if(id === 'p7') mesh = G3D.prismMesh(3, 1.6, 1.8);  /* тетраэдр-подобно */
      else if(id === 'p10') mesh = G3D.prismMesh(4, 1.6, 2.0); /* куб для координат */
      else mesh = G3D.prismMesh(6, 1.5, 2.2);

      function draw(){
        const M = G3D.buildRotMatrix(scene);
        let inner = '';
        if(mesh){
          inner = G3D.renderMesh(mesh, M, scene);
        } else {
          /* сфера */
          const sph = G3D.sphereWireframe(1.7, 5, 10);
          inner = G3D.renderSphereWireframe(sph, M, scene);
        }
        svg.innerHTML = inner;
      }
      draw();
      G3D.attachOrbit(svg, scene, draw);
      const tools = document.querySelectorAll('#' + id + '-iv-demo .g3d-tools .btn');
      tools.forEach(b => b.addEventListener('click', () => {
        G3D.presetView(scene, b.dataset.view, draw);
      }));
    }
  }

  wireReadBtn(id);
}

/* ===== Search ===== */
const SEARCH_INDEX = (function(){
  const arr=[];
  PARAS.forEach(p=>arr.push({kind:'Параграф',title:p.num+' '+p.name,desc:p.sub||'',sec:p.id}));
  return arr;
})();
function initSearch(){
  const modal=document.getElementById('search-modal'),inp=document.getElementById('search-input'),out=document.getElementById('search-results'),btn=document.getElementById('search-btn');
  if(!modal||!inp||!out) return;
  let cur=0,rows=[];
  function score(q,it){ const t=(it.title+' '+it.desc).toLowerCase(); if(t.includes(q)) return 100+(it.title.toLowerCase().startsWith(q)?50:0); let s=0; q.split(/\\s+/).forEach(w=>{if(w&&t.includes(w))s+=10;}); return s; }
  function rank(q){ q=q.trim().toLowerCase(); if(!q) return SEARCH_INDEX.slice(0,12); return SEARCH_INDEX.map(it=>({it,s:score(q,it)})).filter(x=>x.s>0).sort((a,b)=>b.s-a.s).slice(0,20).map(x=>x.it); }
  function render(){ cur=0; if(!rows.length){out.innerHTML='<div class="search-empty">Ничего не найдено</div>';return;} out.innerHTML=rows.map((r,i)=>'<button class="search-row'+(i===0?' active':'')+'" data-i="'+i+'"><div class="sr-kind">'+r.kind+'</div><div class="sr-title">'+r.title+'</div>'+(r.desc?'<div class="sr-desc">'+(r.desc.length>90?r.desc.slice(0,90)+'\\u2026':r.desc)+'</div>':'')+'</button>').join(''); out.querySelectorAll('.search-row').forEach(b=>b.addEventListener('click',()=>{cur=+b.dataset.i;pick();})); }
  function pick(){ const r=rows[cur]; if(!r) return; close(); goTo(r.sec); }
  function move(d){ const items=out.querySelectorAll('.search-row'); if(!items.length) return; items[cur]&&items[cur].classList.remove('active'); cur=(cur+d+items.length)%items.length; items[cur].classList.add('active'); items[cur].scrollIntoView({block:'nearest'}); }
  function open(){ modal.classList.add('show'); inp.value=''; rows=rank(''); render(); setTimeout(()=>inp.focus(),50); }
  function close(){ modal.classList.remove('show'); }
  btn&&btn.addEventListener('click',open);
  modal.addEventListener('click',e=>{if(e.target===modal)close();});
  inp.addEventListener('input',()=>{rows=rank(inp.value);render();});
  inp.addEventListener('keydown',e=>{ if(e.key==='ArrowDown'){e.preventDefault();move(1);}else if(e.key==='ArrowUp'){e.preventDefault();move(-1);}else if(e.key==='Enter'){e.preventDefault();pick();}else if(e.key==='Escape'){e.preventDefault();close();} });
  document.addEventListener('keydown',e=>{ if((e.ctrlKey||e.metaKey)&&(e.key==='k'||e.key==='K')){ e.preventDefault(); if(modal.classList.contains('show')) close(); else open(); } });
}

function initSidebarToggle(){
  const side=document.getElementById('col-side'),back=document.getElementById('col-side-backdrop'),btn=document.getElementById('sidebar-btn');
  if(!side||!btn) return;
  function open(){ side.classList.add('open'); back.classList.add('show'); }
  function close(){ side.classList.remove('open'); back.classList.remove('show'); }
  btn.addEventListener('click',()=>{ if(side.classList.contains('open')) close(); else open(); });
  back.addEventListener('click',close);
  document.addEventListener('keydown',e=>{ if(e.key==='Escape') close(); });
}

function init(){
  loadProgress(); initTheme(); initSidebarToggle(); initSearch();
  buildParaSelector(); refreshProgressUI(); loadServerReadState(); goTo(PARAS[0].id);
  setTimeout(()=>achievement('start'), 600);
  if(window.LS&&window.LS.xp){
    window.LS.xp.load().then(function(s){ if(s&&s.xp>STATE.xp){ STATE.xp=s.xp; STATE.level=calcLevel(STATE.xp); saveProgress(); refreshProgressUI(); if(STATE.current) buildSidebar(STATE.current); } });
  }
}
document.addEventListener('DOMContentLoaded', init);

/* === GEOM11 POLISH JS === */
(function(){
  function bumpScore(el){
    if(!el) return;
    el.classList.remove('bump');
    void el.offsetWidth;
    el.classList.add('bump');
    setTimeout(function(){ try{ el.classList.remove('bump'); }catch(e){} }, 270);
  }
  window.__geom11BumpScore = bumpScore;

  function observeScores(root){
    root = root || document;
    var nodes = root.querySelectorAll('.score-display b');
    nodes.forEach(function(b){
      if(b.__scoreObs) return;
      b.__scoreObs = true;
      var last = b.textContent;
      try{
        var mo = new MutationObserver(function(){
          var nv = b.textContent;
          if(nv !== last){ last = nv; bumpScore(b); }
        });
        mo.observe(b, {childList:true, characterData:true, subtree:true});
      }catch(e){}
    });
  }
  function rescanScores(){ try{ observeScores(document); }catch(e){} }
  if(document.readyState === 'loading') document.addEventListener('DOMContentLoaded', rescanScores);
  else rescanScores();

  try{
    var rootObs = new MutationObserver(function(muts){
      var need = false;
      for(var i=0;i<muts.length && !need;i++){
        var m = muts[i];
        for(var j=0;j<m.addedNodes.length;j++){
          var n = m.addedNodes[j];
          if(n.nodeType===1){
            if(n.classList && n.classList.contains('score-display')) { need = true; break; }
            if(n.querySelector && n.querySelector('.score-display b')) { need = true; break; }
          }
        }
      }
      if(need) rescanScores();
    });
    rootObs.observe(document.body, {childList:true, subtree:true});
  }catch(e){}

  function refreshDoneMarks(){
    try{
      if(typeof STATE === 'undefined' || !STATE.progress) return;
      document.querySelectorAll('.psel-card').forEach(function(c){
        var id = c.dataset.id || c.dataset.progCard;
        if(!id) return;
        var pct = +STATE.progress[id] || 0;
        if(!c.querySelector('.psel-done')){
          var s = document.createElement('span');
          s.className = 'psel-done';
          s.setAttribute('title','Прочитано');
          s.innerHTML = '<svg viewBox="0 0 24 24"><polyline points="20 6 9 17 4 12"/></svg>';
          c.appendChild(s);
        }
        c.classList.toggle('done', pct >= 50);
      });
    }catch(e){}
  }
  try{
    if(typeof window.refreshProgressUI === 'function'){
      var _origRP = window.refreshProgressUI;
      window.refreshProgressUI = function(){ var r = _origRP.apply(this, arguments); setTimeout(refreshDoneMarks, 0); return r; };
    }
  }catch(e){}
  setTimeout(refreshDoneMarks, 600);
  setTimeout(refreshDoneMarks, 1800);
  window.addEventListener('focus', function(){ setTimeout(refreshDoneMarks, 200); });

  document.addEventListener('click', function(e){
    var card = e.target.closest && e.target.closest('.psel-card');
    if(!card) return;
    var id = card.dataset.id;
    if(!id) return;
    setTimeout(function(){
      var sec = document.getElementById('sec-' + id);
      if(sec) try{ sec.scrollIntoView({behavior:'smooth', block:'start'}); }catch(e){}
    }, 60);
  });
})();
</script>

</body>
</html>
`;
}

// === Main ===
for (const ch of CHAPTERS) {
  const out = path.join(OUT_DIR, `geometry_11_ch${ch.n}.html`);
  const content = chapterTpl(ch);
  fs.writeFileSync(out, content, 'utf8');
  console.log(`Wrote ${out} (${content.length} bytes)`);
}
console.log('Done.');
