/* Mavzu va toifa javobi uchun umumiy blok uslublari.
 *
 * Ikki o'quvchi shu faylni yuklaydi, shuning uchun unda sahifa karkasi yo'q:
 * yo'l, sarlavha, mundarija paneli va qo'shni mavzular `pages/mavzu.css` da.
 *
 * Dizayn tili — «Sukunat» (spec 2026-09-07 §4): rubrika qutiga solinmaydi,
 * chap chiziq va yorliq bilan ajratiladi. Ranglar faqat tokendan.
 *
 * `--lesson-scale` va `--lesson-leading` «Ko'rinish» sozlamasidan keladi:
 * mavzu sahifasi ularni `<html>` ga qo'yadi, blok esa meros oladi.
 * Sozlama yo'q sahifada fallback ishlaydi va hech narsa buzilmaydi.
 */

/* Sarlavha ostidagi meta bo'laklari alohida <span> — ajratgich CSS dan
   keladi (matnga qo'shilsa tarjimaga ham, nusxaga ham tushardi). Mavzu va
   toifa javobi o'quvchisiga umumiy: ilgari faqat mavzu sahifasida yozilgan
   edi va toifa javobida «1-savolYangilangan» yopishib chiqardi. */
.lesson-meta span + span::before { content: " · "; }

.lesson-body { font-size: calc(18px * var(--lesson-scale, 1)); line-height: var(--lesson-leading, 1.75); color: var(--text-body); overflow-wrap: break-word; }
.lesson-body p { margin: 0 0 24px; }
.lesson-body code { font-family: var(--font-mono); font-size: .9em; color: var(--text-primary); }
.lesson-body strong { color: var(--text-primary); font-weight: 500; }
.lesson-body a { color: var(--accent); text-decoration: none; }

.lesson-lead { margin: 40px 0 0; font-size: calc(22px * var(--lesson-scale, 1)); line-height: 1.5; font-weight: 300; color: var(--text-primary); }
.lesson-chapter { margin: 56px 0 20px; font-size: calc(30px * var(--lesson-scale, 1)); line-height: 1.2; font-weight: 400; letter-spacing: -.02em; color: var(--text-primary); }
.lesson-section { margin: 56px 0 18px; font-size: calc(30px * var(--lesson-scale, 1)); line-height: 1.2; font-weight: 400; letter-spacing: -.02em; color: var(--text-primary); scroll-margin-top: calc(var(--header-height) + 24px); }
.lesson-subsection { margin: 36px 0 14px; font-size: calc(20px * var(--lesson-scale, 1)); line-height: 1.3; font-weight: 500; color: var(--text-primary); }

.lesson-list, .lesson-steps ol, .lesson-selfcheck ol, .lesson-sources ol { margin: 0 0 24px; padding-left: 22px; }
.lesson-list li, .lesson-steps li, .lesson-selfcheck li { margin-bottom: 10px; }
.lesson-list-heading, .lesson-steps-title { margin: 32px 0 10px; font-size: calc(16px * var(--lesson-scale, 1)); font-weight: 500; color: var(--text-primary); }

/* Rubrikalar — chap chiziq bilan, quti emas */
.lesson-abstract, .lesson-tldr, .lesson-note, .lesson-pitfall, .lesson-mnemonic, .lesson-case, .lesson-selfcheck, .lesson-definition, .lesson-steps {
  margin: 32px 0; padding-left: 20px; border-left: 1px solid var(--border-strong);
}
.lesson-pitfall { border-left-color: var(--danger); }
.lesson-abstract { border-left-color: var(--accent); }
.lesson-abstract-title { margin: 0 0 10px; font-size: calc(20px * var(--lesson-scale, 1)); font-weight: 500; color: var(--text-primary); }
.lesson-abstract p, .lesson-tldr p, .lesson-note p, .lesson-pitfall p, .lesson-mnemonic p, .lesson-case p { margin: 0 0 12px; }
.lesson-abstract > :last-child, .lesson-tldr > :last-child, .lesson-note > :last-child, .lesson-pitfall > :last-child, .lesson-mnemonic > :last-child, .lesson-case > :last-child, .lesson-selfcheck > :last-child, .lesson-steps > :last-child { margin-bottom: 0; }

.lesson-badge { display: block; margin-bottom: 8px; font-size: 11px; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; color: var(--text-tertiary); }
.lesson-pitfall-badge { color: var(--danger); }
.lesson-case-badge, .lesson-mnemonic-badge, .lesson-tldr-badge { color: var(--text-tertiary); }
.lesson-mnemonic-key { font-weight: 500; color: var(--text-primary); }
.lesson-case-question { font-weight: 500; color: var(--text-primary); }
.lesson-selfcheck-q { font-weight: 500; color: var(--text-primary); }
/* Lotincha va inglizcha nom atamaning OSTIDA turadi, yonida emas. Inline
   qolsa `dt` matniga yopishib qoladi va «Epistaksisepistaxis» bo'lib
   o'qiladi — 2026-09-08 refaktorida `display: block` tushib qolgan edi. */
.lesson-definition-meta { display: block; margin-top: 2px; font-size: 13px; font-weight: 400; color: var(--text-tertiary); }

.lesson-reveal { margin-top: 8px; }
.lesson-reveal summary { min-height: 44px; display: flex; align-items: center; color: var(--accent); font-size: 14px; font-weight: 500; cursor: pointer; list-style: none; }
.lesson-reveal summary::-webkit-details-marker { display: none; }
.lesson-reveal summary:focus-visible { outline-offset: 2px; }

/* Asosiy raqamlar — yig'ilmaydi, hamma qator ochiq (spec: bosib ochish
   ikkinchi ish bo'lardi). */
.lesson-keyfacts { margin: 40px 0; }
.lesson-keyfact { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 24px; align-items: baseline; padding: 14px 0; border-top: 1px solid var(--border-subtle); }
.lesson-keyfact:last-child { border-bottom: 1px solid var(--border-subtle); }
.lesson-keyfact dt { margin: 0; font-size: 13px; color: var(--text-tertiary); }
.lesson-keyfact dd { margin: 0; font-size: calc(17px * var(--lesson-scale, 1)); color: var(--text-primary); font-variant-numeric: tabular-nums; }

/* Qisqartmalar va izohlar — tavsif ostida, plitkalardan oldin (qaror
   2026-09-15). Quti emas: ustki va pastki chiziq, ikki ustunli ochiq ro'yxat.
   Qisqartmalar va atamalar ikki guruh; ular ingichka chiziq bilan ajraladi. */
.lesson-glossary { margin: 32px 0; padding: 20px 0; border-top: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle); }
.lesson-glossary-title { margin: 0 0 14px; font-size: 11px; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; color: var(--text-tertiary); }
.lesson-glossary-list { display: grid; grid-template-columns: minmax(5rem, 12rem) minmax(0, 1fr); column-gap: 24px; row-gap: 10px; margin: 0; font-size: calc(15px * var(--lesson-scale, 1)); line-height: 1.55; }
.lesson-glossary-list + .lesson-glossary-list { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-subtle); }
.lesson-glossary-list dt { margin: 0; font-weight: 500; color: var(--text-primary); }
.lesson-glossary-list dd { margin: 0; color: var(--text-body); }
.lesson-glossary-original { color: var(--text-tertiary); font-style: italic; }
@media (max-width: 560px) {
  .lesson-glossary-list { grid-template-columns: minmax(0, 1fr); row-gap: 2px; }
  .lesson-glossary-list dd { margin-bottom: 10px; }
}

/* Rasm va jadval */
.lesson-figure { margin: 32px 0; }
.lesson-figure img { display: block; width: 100%; border-radius: 8px; }
.lesson-figure figcaption { margin-top: 12px; font-size: 13px; line-height: 1.5; color: var(--text-tertiary); }
.lesson-figure-source { display: block; margin-top: 4px; color: var(--text-tertiary); }

.lesson-table { margin: 32px 0; }
.lesson-table figcaption { margin-bottom: 12px; font-size: 13px; color: var(--text-tertiary); }
.lesson-table-scroll { overflow-x: auto; }
.lesson-table table { width: 100%; border-collapse: collapse; font-size: calc(15px * var(--lesson-scale, 1)); }
.lesson-table th, .lesson-table td { padding: 12px 16px 12px 0; border-bottom: 1px solid var(--border-subtle); text-align: left; vertical-align: top; line-height: 1.45; }
.lesson-table th { font-size: 11px; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--text-tertiary); border-bottom-color: var(--border-strong); }

/* Manbalar va mashq */
.lesson-sources { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.lesson-sources h2 { margin: 0 0 14px; font-size: 12px; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; color: var(--text-tertiary); }
/* Iqtibosdan tushilgan band sarlavha qatori (yoki yashirilgan bo'lsa o'qish
   chizig'i) ostida bo'sh joy bilan to'xtaydi. Ilgari chegara yo'q edi:
   band ekranning eng tepasiga tushib, chiziq ro'yxatni kesib o'tardi (2026-09-28). */
.lesson-sources li { margin-bottom: 8px; font-size: 14px; line-height: 1.55; color: var(--text-secondary); scroll-margin-top: calc(var(--yopishqoq-ust, var(--header-height)) + 16px); }

/* Mavzuga oid asbob va jihozlar — jihozlar katalogiga havola. Manbalar kabi
   yorliqli sarlavha va chiziqli ro'yxat; karta yo'q. Keng ekranda ikki ustun. */
.lesson-equipment { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.lesson-equipment h2 { margin: 0 0 10px; font-size: 12px; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; color: var(--text-tertiary); }
.lesson-equipment ul { margin: 0; padding: 0; list-style: none; }
.lesson-equipment li { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; min-height: 44px; padding: 10px 0; border-bottom: 1px solid var(--border-subtle); break-inside: avoid; }
.lesson-equipment-link { color: var(--text-primary); font-size: 15px; line-height: 1.45; text-decoration: none; }
.lesson-equipment-link:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; border-radius: 4px; }
.lesson-equipment-kind { flex: none; font-size: 12px; color: var(--text-tertiary); }
@media (hover: hover) and (pointer: fine) { .lesson-equipment-link:hover { color: var(--accent); } }
@media (min-width: 720px) { .lesson-equipment ul { columns: 2; column-gap: 32px; } }

.lesson-practice { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.lesson-practice h2 { margin: 0 0 8px; font-size: 24px; font-weight: 400; letter-spacing: -.02em; }
.lesson-practice-lead { margin: 0 0 18px; color: var(--text-secondary); font-size: 15px; }
.lesson-practice-stage { margin-top: 20px; }
.lesson-practice-card { padding: 20px 22px; border: 1px solid var(--border-strong); border-radius: var(--radius-card); }
.lesson-practice-step { display: block; margin-bottom: 10px; font-size: 12px; color: var(--text-tertiary); font-family: var(--font-mono); }
.lesson-practice-q { margin: 0 0 14px; font-size: 17px; line-height: 1.5; color: var(--text-primary); }
.lesson-practice-a { margin-bottom: 16px; color: var(--text-body); line-height: 1.6; }
.lesson-practice-a p { margin: 0 0 10px; }
.lesson-practice-actions { display: flex; gap: 10px; }
.lesson-practice-open { display: flex; gap: 10px; flex-wrap: wrap; }
.lesson-practice-score { margin: 0 0 14px; font-size: 16px; color: var(--text-primary); }
/* Qoqilgan savollar — mashq tugagach javobi bilan ochiq. Bu ro'yxat emas,
   o'qish uchun matn: shuning uchun karta ichida emas, chap chiziq bilan
   ajratilgan va tipografiyasi maqolaning o'zi bilan bir xil. */
.lesson-practice-missed-lead { margin: 18px 0 10px; color: var(--text-secondary); font-size: 14px; }
.lesson-practice-missed { margin: 0 0 18px; padding: 0; list-style: none; display: grid; gap: 14px; }
.lesson-practice-missed li { padding-left: 16px; border-left: 2px solid var(--border-strong); }
.lesson-practice-missed .lesson-practice-q { margin: 0 0 6px; font-size: 16px; }
.lesson-practice-a-open { margin: 0; color: var(--text-body); font-size: 15px; line-height: 1.6; }

@media (max-width: 900px) {
  .lesson-body { font-size: calc(17px * var(--lesson-scale, 1)); line-height: var(--lesson-leading, 1.7); }
  .lesson-lead { margin-top: 28px; font-size: calc(18px * var(--lesson-scale, 1)); }
  .lesson-chapter, .lesson-section { margin: 36px 0 12px; font-size: calc(24px * var(--lesson-scale, 1)); }
  .lesson-keyfact { grid-template-columns: 1fr; gap: 4px; padding: 12px 0; }
  .lesson-keyfact dd { font-size: calc(16px * var(--lesson-scale, 1)); }
}

/* Mavzulararo havola: matndagi `NN.NN` «Bo'lim: mavzu nomi» bo'lib chiqadi.
   Matn ichidagi havola — rang va tagiga chiziq; yozilmagan mavzu bosilmaydi. */
.lesson-topic-link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .2em;
  border-radius: 4px;
}
.lesson-topic-link:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
@media (hover: hover) and (pointer: fine) {
  a.lesson-topic-link:hover { text-decoration-thickness: 2px; }
}
.lesson-topic-link.is-planned { color: var(--text-secondary); text-decoration: none; }

/* Iqtibos — har manba o'z chipida (standartlardagi `.doc-ref` bilan bir xil):
   `[3, 5]` ikki chip bo'lib chiqadi, qavs yo'q. Chip matn qatorini kengaytirmaydi. */
.lesson-cite-group { display: inline-flex; flex-wrap: wrap; gap: 3px; margin: 0 2px; vertical-align: baseline; }
.lesson-cite { display: inline-block; min-width: 1.9em; padding: 1px 7px; border-radius: var(--radius-pill); color: var(--accent); background: var(--accent-soft); font-size: .75em; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1.5; text-align: center; text-decoration: none; scroll-margin-top: calc(var(--header-height) + 16px); }
@media (hover: hover) and (pointer: fine) { .lesson-cite:hover { color: var(--text-on-accent); background: var(--accent); } }
.lesson-cite:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 1px; }
.lesson-source-book { color: var(--accent); text-decoration: none; }
.lesson-source-book:hover { text-decoration: underline; }
.lesson-source-book:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
/* Iqtibosdan tushilgan band 1,2 s chap chiziq bilan ajraladi (`:target`
   pushState da yangilanmaydi — sinf sahifa qo'yadi). */
.lesson-sources li.is-target { animation: manba-flash 1.2s var(--ease-out); }
.lesson-sources li:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 4px; }
@keyframes manba-flash { from { box-shadow: inset 3px 0 0 var(--accent); } to { box-shadow: inset 3px 0 0 transparent; } }
@media (prefers-reduced-motion: reduce) { .lesson-sources li.is-target { animation: none; } }

/* MCQ variantlari (spec 2026-09-20 §6): katta yuza, holat matn yorlig'i bilan. */
.lesson-practice-options { display: grid; gap: 10px; margin: 14px 0; }
.lesson-practice-option { display: flex; align-items: center; gap: 12px; min-height: 44px; padding: 12px 16px; border: 1px solid var(--border-strong); border-radius: var(--radius-control); background: var(--canvas); color: var(--text-primary); font: inherit; text-align: left; cursor: pointer; }
.lesson-practice-option:disabled { cursor: default; }
.lesson-practice-option.is-correct { border-color: var(--accent); }
.lesson-practice-option.is-wrong { color: var(--text-secondary); }
.lesson-practice-option:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.lesson-practice-option-text { flex: 1; }
.lesson-practice-option-label { flex: none; font-size: 12px; font-weight: 500; color: var(--text-tertiary); }
.lesson-practice-option.is-correct .lesson-practice-option-label { color: var(--accent); }
.lesson-practice-next { margin-top: 12px; }
.lesson-practice-selfrated { margin: 4px 0 12px; font-size: 13px; color: var(--text-tertiary); }

/* Qidiruvdan topilgan so'z (js/izla-belgi.js, spec 2026-09-24-qidiruv-joyiga-sakrash).
   Sahifa so'zgacha aylanib bo'lgach `is-yondi` qo'shiladi va belgi uch
   qatlamda paydo bo'ladi: marker chapdan o'ngga chiziladi, atrofidan bir
   marta nur tarqaladi, keyin rang och tusga so'nadi va ingichka halqa
   qoladi — o'quvchi matnga bosguncha. Tagchiziq ataylab yo'q: u bosiladigan
   atama va havolaning belgisi. Matn rangi asosiy — accent rangli havola
   sariq fonda kontrastini yo'qotardi. */
@property --izla-rang { syntax: '<color>'; inherits: false; initial-value: transparent; }
.izla-belgi { color: inherit; background: none; border-radius: 5px; padding: .04em .18em; margin: 0 -.18em; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.izla-belgi.is-yondi {
  --izla-rang: var(--izla-soft);
  color: var(--text-primary);
  background-image: linear-gradient(var(--izla-rang), var(--izla-rang));
  background-repeat: no-repeat; background-position: left center; background-size: 100% 100%;
  box-shadow: 0 0 0 1px var(--izla-halo);
  animation:
    izla-chizish 560ms cubic-bezier(.22, .9, .3, 1) both,
    izla-rang 2.6s ease-in-out both,
    izla-nur 1s cubic-bezier(.2, .8, .2, 1) both;
  animation-delay: var(--izla-kechikish, 0ms), var(--izla-kechikish, 0ms), calc(var(--izla-kechikish, 0ms) + 420ms);
}
@keyframes izla-chizish { from { background-size: 0% 100%; } to { background-size: 100% 100%; } }
@keyframes izla-rang { 0%, 55% { --izla-rang: var(--izla-strong); } 100% { --izla-rang: var(--izla-soft); } }
@keyframes izla-nur { from { box-shadow: 0 0 0 0 var(--izla-halo); } 55% { box-shadow: 0 0 0 7px transparent; } to { box-shadow: 0 0 0 1px var(--izla-halo); } }
@media (prefers-reduced-motion: reduce) { .izla-belgi.is-yondi { animation: none; } }