/* Mavzu o'quvchisi — sahifa karkasi.
 *
 * Matn va rubrika uslublari `css/blocks.css` da: ular toifa javob
 * o'quvchisi bilan birga ishlatiladi. Bu faylda faqat shu sahifaga
 * tegishlisi qoladi — yo'l, sarlavha, holat, mundarija paneli,
 * qo'shni mavzular va o'qish rejimi.
 *
 * Dizayn tili: «Sukunat» (spec 2026-09-07 §4). Matn 640px ustunda,
 * birinchi ekranda boshlanadi; yon ustun yo'q.
 */

/* `--lesson-scale` va `--lesson-leading` bu yerda e'lon qilinmaydi: ular
   `<html>` ga qo'yiladi (`<head>` skripti chaqnashsiz), bu yerdagi qiymat
   esa merosni to'sib qo'yardi. Sozlama yo'q bo'lsa blocks.css fallback'i. */
.lesson-page {
  width: min(var(--reading-width), calc(100% - 48px));
  margin: 0 auto;
  padding-bottom: 96px;
}

/* Progress — shell header ostida, 1px. Panel yashiringanda u ham ketadi:
   ekranda faqat matn qoladi. Ikkalasi bir vaqtda va bir tezlikda. */
.reader-progress { position: sticky; top: var(--header-height); z-index: 15; height: 1px; background: var(--border-subtle); transition: transform 220ms var(--ease-out), opacity 180ms var(--ease-standard); }
.reader-progress > i { display: block; height: 1px; width: 0; background: var(--accent); transition: width 120ms linear; }
[data-reading="hidden"] .reader-progress { transform: translateY(calc(-1 * var(--header-height) - 2px)); opacity: 0; }

/* Yo'l va asboblar qatori ham matndan ustun emas — u ham ketadi. */
[data-reading="hidden"] .lesson-bar { opacity: 0; pointer-events: none; }

/* Yuqori qator: yo'l va asboblar */
.lesson-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; transition: opacity 180ms var(--ease-standard); }
.lesson-crumb { display: inline-flex; align-items: center; gap: 2px; min-height: 44px; color: var(--text-secondary); font-size: 14px; text-decoration: none; }
@media (hover: hover) and (pointer: fine) { .lesson-crumb:hover { color: var(--text-primary); } }
.lesson-tools { display: flex; align-items: center; gap: 4px; }
.lesson-percent { font-size: 13px; color: var(--text-tertiary); padding-right: 4px; }

/* Sarlavha */
.lesson-head { padding-top: 32px; }
.lesson-head .eyebrow { margin-bottom: 16px; display: flex; align-items: center; gap: 6px; }
.lesson-head .eyebrow-mark { display: inline-flex; color: var(--text-secondary); }
/* Tarjima yozuvi sarlavhadan oldin turadi: o'quvchi matnga kirishdan oldin
   qaysi tildaligini biladi. Chap qirra bilan ajratiladi — ogohlantirish
   emas, izoh. */
.lesson-translation-note {
  margin: 0 0 16px; padding: 10px 0 10px 14px;
  border-left: 2px solid var(--border-strong);
  font-size: 14px; line-height: 1.5; color: var(--text-secondary);
}
.lesson-head h1 { margin: 0; font-size: 48px; line-height: 1.1; font-weight: 300; letter-spacing: -.03em; }
.lesson-head h1:empty { display: none; }
.lesson-meta { margin: 20px 0 0; font-size: 14px; color: var(--text-tertiary); }
.lesson-meta:empty { display: none; }
/* Lede — mavzu `covers` matni (build-yangi-seo, spec 2026-09-21 §4.2). Robot
   indekslagan narsa o'quvchiga ham ko'rinadi; matn chizilgach JS yashiradi,
   qulfda qoladi. */
.lesson-lede { margin: 14px 0 0; max-width: 60ch; font-size: 17px; line-height: 1.55; color: var(--text-secondary); }
.clinical-language { margin-top: 14px; }

.lesson-status { min-height: 44px; display: flex; align-items: center; gap: 16px; }
.lesson-locked { display: flex; flex-direction: column; align-items: flex-start; }
.lesson-locked .state-title { max-width: 52ch; font-size: 18px; font-weight: 400; line-height: 1.6; }

.lesson-layout { display: block; }
.lesson-main { min-width: 0; }

/* «O'qidim» — matn oxirida, qaytariladigan tugma. Belgilangach accent
   rangga o'tadi: faol holat har doim accent (spec §2). */
.lesson-done { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.lesson-done .button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.lesson-done-hint { margin: 0; font-size: 13px; color: var(--text-tertiary); }
/* Mehmonga profil taklifi — «tugatdim» qatori bilan bir xil chiziq, karta emas. */
.lesson-guest { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.lesson-guest-title { margin: 0 0 6px; font-size: 17px; font-weight: 550; letter-spacing: -.01em; color: var(--text-primary); }
.lesson-guest-body { margin: 0 0 16px; max-width: 56ch; font-size: 14.5px; line-height: 1.6; color: var(--text-secondary); }
.lesson-guest-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* Xatcho'p qo'yilgan holat — sarlavha asboblarida */
.lesson-tools .icon-button[aria-pressed="true"] { color: var(--accent); }

/* Qo'shni mavzular */
.lesson-pager { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.lesson-pager-link { display: flex; flex-direction: column; gap: 6px; min-height: 44px; padding: 16px 18px; border: 1px solid var(--border-strong); border-radius: var(--radius-card); color: var(--text-primary); text-decoration: none; }
.lesson-pager-link small { font-size: 12px; color: var(--text-tertiary); }
.lesson-pager-link strong { font-size: 15px; font-weight: 500; }
.lesson-pager-link.is-next { text-align: right; grid-column: 2; }
/* Karta radiusli: fokus halqasi chetdan biroz nariga chiziladi, aks holda
   burchakda qirqilib ko'rinadi. */
.lesson-pager-link:focus-visible { outline-offset: 3px; }
@media (hover: hover) and (pointer: fine) { .lesson-pager-link:hover { border-color: var(--text-primary); } }

@media (max-width: 900px) {
  .lesson-page { width: calc(100% - 48px); padding-bottom: 80px; }
  .lesson-head { padding-top: 20px; }
  .lesson-head h1 { font-size: 32px; line-height: 1.12; letter-spacing: -.025em; }
  .lesson-pager { grid-template-columns: 1fr; }
  .lesson-pager-link.is-next { grid-column: 1; text-align: left; }
}