diff --git a/backend/package-lock.json b/backend/package-lock.json
index d0a9014..f0daf0e 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -16,6 +16,7 @@
         "js-yaml": "^4.1.1",
         "jsonwebtoken": "^9.0.2",
         "multer": "^2.1.1",
+        "puppeteer-core": "^25.1.0",
         "sharp": "^0.34.5",
         "ws": "^8.20.0"
       },
@@ -498,6 +499,30 @@
         "url": "https://opencollective.com/libvips"
       }
     },
+    "node_modules/@puppeteer/browsers": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@puppeteer/browsers/-/browsers-3.0.4.tgz",
+      "integrity": "sha512-HGM8iAmGTf+Y7t0373szVbTmt3d7vPkYL/1bpOkOFO0YUYLgSeuYBCzESklogNPvOBnZ/MRD5f07OkpqH1trtA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "modern-tar": "^0.7.6",
+        "yargs": "^17.7.2"
+      },
+      "bin": {
+        "browsers": "lib/main-cli.js"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      },
+      "peerDependencies": {
+        "proxy-agent": ">=8.0.1"
+      },
+      "peerDependenciesMeta": {
+        "proxy-agent": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/accepts": {
       "version": "1.3.8",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -511,6 +536,30 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
     "node_modules/anymatch": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
@@ -708,6 +757,54 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/chromium-bidi": {
+      "version": "16.0.1",
+      "resolved": "https://registry.npmjs.org/chromium-bidi/-/chromium-bidi-16.0.1.tgz",
+      "integrity": "sha512-J63PGu/9PpeCwLIcKYyzWP6yaVL5pxuBc0shlYCYM8BaAkmlwiQboXO1iNbOgSDbVklEyYFfNEcHD8oOAWacUA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "mitt": "^3.0.1",
+        "zod": "^3.24.1"
+      },
+      "engines": {
+        "node": ">=20.19.0 <22.0.0 || >=22.12.0"
+      },
+      "peerDependencies": {
+        "devtools-protocol": "*"
+      }
+    },
+    "node_modules/cliui": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.1",
+        "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "license": "MIT"
+    },
     "node_modules/compressible": {
       "version": "2.0.18",
       "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.18.tgz",
@@ -852,6 +949,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/devtools-protocol": {
+      "version": "0.0.1624250",
+      "resolved": "https://registry.npmjs.org/devtools-protocol/-/devtools-protocol-0.0.1624250.tgz",
+      "integrity": "sha512-YFAat/lOiIk0ARmBweG+ygrEcbZrq5B9urRyUoeQKp53MlidHXE2TmTbxKcaXoQj7u/aX+jebDO4BW55rs0WwA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/dotenv": {
       "version": "16.6.1",
       "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.6.1.tgz",
@@ -893,6 +996,12 @@
       "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==",
       "license": "MIT"
     },
+    "node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "license": "MIT"
+    },
     "node_modules/encodeurl": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-2.0.0.tgz",
@@ -932,6 +1041,15 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/escalade": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
+      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -1066,6 +1184,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "license": "ISC",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
+    },
     "node_modules/get-intrinsic": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.3.0.tgz",
@@ -1239,6 +1366,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/is-fullwidth-code-point": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+      "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/is-glob": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.3.tgz",
@@ -1450,6 +1586,21 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/mitt": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/mitt/-/mitt-3.0.1.tgz",
+      "integrity": "sha512-vKivATfr97l2/QBCYAkXYDbrIWPM2IIKEl7YPhjCvKlG3kE2gm+uBo6nEXK3M5/Ffh/FLpKExzOQ3JJoJGFKBw==",
+      "license": "MIT"
+    },
+    "node_modules/modern-tar": {
+      "version": "0.7.6",
+      "resolved": "https://registry.npmjs.org/modern-tar/-/modern-tar-0.7.6.tgz",
+      "integrity": "sha512-sweCIVXzx1aIGTCdzcMlSZt1h8k5Tmk08VNAuRk3IU28XamGiOH5ypi11g6De2CH7PhYqSSnGy2A/EFhbWnVKg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
@@ -1638,6 +1789,23 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/puppeteer-core": {
+      "version": "25.1.0",
+      "resolved": "https://registry.npmjs.org/puppeteer-core/-/puppeteer-core-25.1.0.tgz",
+      "integrity": "sha512-jKzy5y4WG6uNuFbTWgW1D7mqoT9o0nllc/6a1DGF775T1mPmgw3scdFEtEq67yVFikavQmbYq6NLfbTfxHSlqQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@puppeteer/browsers": "3.0.4",
+        "chromium-bidi": "16.0.1",
+        "devtools-protocol": "0.0.1624250",
+        "typed-query-selector": "^2.12.2",
+        "webdriver-bidi-protocol": "0.4.2",
+        "ws": "^8.21.0"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
     "node_modules/qs": {
       "version": "6.14.2",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.14.2.tgz",
@@ -1704,6 +1872,15 @@
         "node": ">=8.10.0"
       }
     },
+    "node_modules/require-directory": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+      "integrity": "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -1948,6 +2125,32 @@
         "safe-buffer": "~5.2.0"
       }
     },
+    "node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -2013,6 +2216,12 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/typed-query-selector": {
+      "version": "2.12.2",
+      "resolved": "https://registry.npmjs.org/typed-query-selector/-/typed-query-selector-2.12.2.tgz",
+      "integrity": "sha512-EOPFbyIub4ngnEdqi2yOcNeDLaX/0jcE1JoAXQDDMIthap7FoN795lc/SHfIq2d416VufXpM8z/lD+WRm2gfOQ==",
+      "license": "MIT"
+    },
     "node_modules/typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -2059,10 +2268,33 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/webdriver-bidi-protocol": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/webdriver-bidi-protocol/-/webdriver-bidi-protocol-0.4.2.tgz",
+      "integrity": "sha512-VSV+fzfChirL3e7jay2yUC7B4HQCGtEWEg/MSSQbK+qWbqeGlRLlXTzPpYr3XGUvbpDHumWZBJxgesg4N7dbtA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/wrap-ansi": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
     "node_modules/ws": {
-      "version": "8.20.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
-      "integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
+      "version": "8.21.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.0.tgz",
+      "integrity": "sha512-Vsp28b7DRcimFQvrqu2Wek3z1iYxDCWqHYB8Qsnk/S4RfaCQzPGPyBNuVjJV3cd6UiKtUtp6sNM77gWvzcCH+g==",
       "license": "MIT",
       "engines": {
         "node": ">=10.0.0"
@@ -2079,6 +2311,51 @@
           "optional": true
         }
       }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }
diff --git a/backend/package.json b/backend/package.json
index 73ac269..7a30368 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -14,6 +14,8 @@
     "lint:routes": "node scripts/check-route-auth.js",
     "import:content": "node scripts/import-content.js",
     "import:exam-tasks": "node scripts/import-exam-tasks.js",
+    "index:textbooks": "node scripts/index-textbooks.js",
+    "index:textbooks:full": "node scripts/index-textbooks-headless.js",
     "test": "node --test tests/*.test.js",
     "hooks:install": "sh ../scripts/install-hooks.sh"
   },
@@ -26,6 +28,7 @@
     "js-yaml": "^4.1.1",
     "jsonwebtoken": "^9.0.2",
     "multer": "^2.1.1",
+    "puppeteer-core": "^25.1.0",
     "sharp": "^0.34.5",
     "ws": "^8.20.0"
   },
diff --git a/backend/scripts/index-textbooks-headless.js b/backend/scripts/index-textbooks-headless.js
new file mode 100644
index 0000000..d4247f8
--- /dev/null
+++ b/backend/scripts/index-textbooks-headless.js
@@ -0,0 +1,86 @@
+'use strict';
+/* index-textbooks-headless.js — полный RAG-индекс: рендерит каждый учебник
+ * настоящим браузером (puppeteer-core + системный Chrome/Edge) через локальный
+ * сервер и забирает РЕНДЕРНЫЙ текст параграфов. Покрывает и JS-рендеримые
+ * учебники (математика/физика-движки), которых нет в статическом HTML.
+ *
+ * Требует запущенный сервер (localhost:3000). Долгая операция (минуты).
+ * Запуск:  node backend/scripts/index-textbooks-headless.js
+ * Дополняет/замещает чанки только для успешно отрендеренных учебников. */
+require('dotenv').config({ path: require('path').join(__dirname, '..', '.env') });
+const fs = require('fs');
+const path = require('path');
+const jwt = require('jsonwebtoken');
+const db = require('../src/db/db');
+
+/* Текстовые страницы учебника требуют логина — выпускаем служебный JWT. */
+function authToken() {
+  const u = db.prepare("SELECT id, role, token_version FROM users WHERE is_banned = 0 AND role IN ('admin','teacher') ORDER BY id LIMIT 1").get()
+         || db.prepare('SELECT id, role, token_version FROM users WHERE is_banned = 0 ORDER BY id LIMIT 1').get();
+  if (!u || !process.env.JWT_SECRET) return null;
+  return jwt.sign({ id: u.id, role: u.role, tv: u.token_version }, process.env.JWT_SECRET, { algorithm: 'HS256', expiresIn: '4h' });
+}
+
+const BASE = process.env.ASSISTANT_INDEX_BASE || ('http://localhost:' + (process.env.PORT || 3000));
+const BROWSERS = [
+  'C:/Program Files/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe',
+  'C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe',
+  'C:/Program Files/Microsoft/Edge/Application/msedge.exe',
+];
+const sleep = (ms) => new Promise(r => setTimeout(r, ms));
+
+async function run() {
+  const puppeteer = require('puppeteer-core');
+  const exe = BROWSERS.find(p => { try { return fs.existsSync(p); } catch (e) { return false; } });
+  if (!exe) { console.error('Браузер не найден (Chrome/Edge)'); process.exit(1); }
+  const books = db.prepare('SELECT slug, title FROM textbooks WHERE is_active = 1 ORDER BY slug').all();
+  const del = db.prepare('DELETE FROM textbook_chunks WHERE slug = ?');
+  const ins = db.prepare('INSERT INTO textbook_chunks (slug, textbook_title, section_title, text) VALUES (?, ?, ?, ?)');
+
+  const token = authToken();
+  if (!token) { console.error('Не удалось выпустить токен (нет пользователя или JWT_SECRET)'); process.exit(1); }
+  const browser = await puppeteer.launch({ executablePath: exe, headless: true, args: ['--no-sandbox', '--disable-gpu', '--disable-dev-shm-usage'] });
+  const page = await browser.newPage();
+  await page.setViewport({ width: 1100, height: 900 });
+  await page.evaluateOnNewDocument((t) => { try { localStorage.setItem('ls_token', t); } catch (e) {} }, token);
+  let totalChunks = 0, okBooks = 0;
+
+  for (const b of books) {
+    let chunks = [];
+    try {
+      await page.goto(`${BASE}/textbook/${b.slug}`, { waitUntil: 'networkidle2', timeout: 25000 });
+      await page.waitForSelector('.psel-card, .sec', { timeout: 12000 }).catch(() => {});
+      await sleep(400);
+      const ids = await page.$$eval('.psel-card[data-id]', els => els.map(e => ({ id: e.dataset.id, name: ((e.querySelector('.psel-name') || {}).textContent || '').trim() })));
+      if (ids.length) {
+        for (const s of ids) {
+          try {
+            await page.evaluate(id => { const c = document.querySelector('.psel-card[data-id="' + id + '"]'); if (c) c.click(); }, s.id);
+            await sleep(550);
+            const text = await page.evaluate(() => { const a = document.querySelector('.sec.active'); return a ? a.innerText.replace(/\s+/g, ' ').trim() : ''; });
+            if (text && text.length >= 80) chunks.push({ section: s.name.slice(0, 160), text: text.slice(0, 2000) });
+          } catch (e) {}
+        }
+      } else {
+        const secs = await page.$$eval('.sec', els => els.map(e => e.innerText.replace(/\s+/g, ' ').trim()));
+        secs.forEach(t => { if (t && t.length >= 80) chunks.push({ section: '', text: t.slice(0, 2000) }); });
+      }
+    } catch (e) { /* книга не отрендерилась — оставляем как было */ }
+
+    if (chunks.length) {
+      del.run(b.slug);
+      for (const c of chunks) ins.run(b.slug, b.title || b.slug, c.section, c.text);
+      okBooks++; totalChunks += chunks.length;
+      console.log(`  ${b.slug}: ${chunks.length}`);
+    } else {
+      console.log(`  ${b.slug}: — (нет рендера, оставлено как есть)`);
+    }
+  }
+
+  await browser.close();
+  console.log(`[headless] готово: ${okBooks}/${books.length} учебников, ${totalChunks} чанков (перезаписаны).`);
+  process.exit(0);
+}
+
+run().catch(e => { console.error('[headless] ошибка:', e.message); process.exit(1); });