/* Shell — header, drawer, pastki nav, footer. Spec §4.
   Chegara faqat pastki chiziq; karta, soya, gradient yo'q. */

/* Sticky panel: kontent uning ostidan o'tadi, shuning uchun yupqa parda va
   blur. Matn to'liq o'qiladi — parda 82%, blur esa faqat ostidagi harakatni
   yumshatadi. Blur qo'llab-quvvatlanmasa fon to'liq noshaffof bo'ladi. */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--canvas); transition: transform 220ms var(--ease-out); }
@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .site-header { background: var(--panel-veil); -webkit-backdrop-filter: blur(14px) saturate(120%); backdrop-filter: blur(14px) saturate(120%); }
}

/* O'qish rejimi: pastga aylantirilganda panel yuqoriga chiqib ketadi va
   matn butun ekranni egallaydi. Yuqoriga aylantirilsa qaytadi. */
[data-reading="hidden"] .site-header { transform: translateY(-100%); }
.header-inner { width: min(var(--content-width), calc(100% - 64px)); height: var(--header-height); margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; font-size: 16px; font-weight: 500; letter-spacing: -.01em; text-decoration: none; color: var(--text-primary); }
/* Belgi faylida har tomonda ~11% bo'sh joy bor — manfiy chekka uni optik
   jihatdan header chizig'iga tekislaydi. Rasm emas, fon: ekran o'quvchisi
   havolani faqat «Navnihol» deb o'qiydi. */
.brand-mark { flex: 0 0 auto; width: 34px; height: 34px; margin-left: -4px; background: var(--brand-mark) center / contain no-repeat; }
.desktop-nav { display: flex; align-items: center; gap: 28px; }
.nav-link { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; font-weight: 400; color: var(--text-secondary); text-decoration: none; }
.nav-link[aria-current="page"] { color: var(--accent); font-weight: 500; }
@media (hover: hover) and (pointer: fine) { .nav-link:hover { color: var(--text-primary); } .nav-link[aria-current="page"]:hover { color: var(--accent); } }
.utilities { display: flex; align-items: center; gap: 2px; }
.icon-button { display: inline-grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 0; border-radius: var(--radius-control); color: var(--text-secondary); background: transparent; cursor: pointer; text-decoration: none; }
@media (hover: hover) and (pointer: fine) { .icon-button:hover { color: var(--text-primary); } }
/* Til almashtirgich — ikonka va uchta dumaloq.

   Ilgari `<select>` edi: brauzer uni kompyuterda ro'yxat, mobilda esa OS ning
   suzuvchi oynasi qilib chizardi. Bitta kod, ikki xil ruhiyat. Endi ikkalasida
   ham bir xil.

   Kirish harakati `transform` da emas, mustaqil `translate`/`scale`
   xossalarida: `motion.css` bosish javobini `transform: scale(.97)` bilan
   beradi va ikkalasi bitta xossada bo'lsa biri ikkinchisini o'chirardi.
   Mustaqil xossalar `transform` dan OLDIN qo'llanadi, ya'ni ular qo'shiladi. */
.language-switch { position: relative; display: inline-flex; }
.language-trigger { font-family: var(--font-mono); font-size: 13px; font-weight: 500; letter-spacing: .02em; }
.language-trigger[aria-expanded="true"] { color: var(--accent); }
.language-options { position: absolute; z-index: 30; top: calc(100% + 6px); left: 50%; display: grid; gap: 6px; margin: 0; padding: 0; translate: -50% 0; opacity: 0; visibility: hidden; transition: opacity 140ms var(--ease-standard), visibility 140ms step-end; }
.language-options[data-open="true"] { opacity: 1; visibility: visible; transition: opacity 180ms var(--ease-out); }
/* 44px — sensorli nishonning eng kichik o'lchami. Ikonka tugmasi bilan bir xil. */
.language-option { display: inline-grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--border-strong); border-radius: var(--radius-pill); color: var(--text-secondary); background: var(--canvas-raised); font-family: var(--font-mono); font-size: 12px; font-weight: 500; letter-spacing: .02em; cursor: pointer; translate: 0 -6px; scale: .94; transition: translate 200ms var(--ease-out), scale 200ms var(--ease-out), color var(--press-fast) var(--ease-standard), border-color var(--press-fast) var(--ease-standard), background-color var(--press-fast) var(--ease-standard); }
.language-options[data-open="true"] .language-option { translate: 0 0; scale: 1; }
/* Uchta element uchun stagger — dumaloqlar ketma-ket ochiladi. Uzun ro'yxatda
   bu taqiqlangan (sekinlik hissi), uchtada esa harakatga yo'nalish beradi. */
.language-options[data-open="true"] .language-option:nth-child(2) { transition-delay: 40ms; }
.language-options[data-open="true"] .language-option:nth-child(3) { transition-delay: 80ms; }
.language-option[aria-checked="true"] { border-color: var(--accent); background: var(--accent); color: var(--text-on-accent); }
@media (hover: hover) and (pointer: fine) { .language-option:hover { border-color: var(--accent); color: var(--accent); } .language-option[aria-checked="true"]:hover { color: var(--text-on-accent); } }
.mobile-menu-button { display: none; }

/* Drawer — mobil navigatsiya */
.drawer-backdrop { position: fixed; inset: 0; z-index: 40; display: grid; justify-items: end; border: 0; padding: 0; width: 100%; background: var(--backdrop); opacity: 0; visibility: hidden; transition: opacity 220ms var(--ease-standard), visibility 220ms step-end; }
.drawer-backdrop[data-open="true"] { opacity: 1; visibility: visible; transition: opacity 220ms var(--ease-standard); }
.drawer { width: min(84vw, 320px); height: 100%; padding: max(12px, env(safe-area-inset-top)) 16px 24px; color: var(--text-primary); background: var(--canvas); box-shadow: var(--shadow-float); transform: translateX(100%); transition: transform 240ms var(--ease-out); overflow-y: auto; }
.drawer-backdrop[data-open="true"] .drawer { transform: translateX(0); }
.drawer-head { display: flex; justify-content: space-between; align-items: center; min-height: 52px; margin-bottom: 8px; padding-left: 8px; font-size: 16px; font-weight: 500; }
.drawer-nav { display: flex; flex-direction: column; }
.drawer-nav .nav-link { min-height: 48px; padding: 0 8px; border-top: 1px solid var(--border-subtle); font-size: 15px; }
.drawer-nav .nav-link:first-child { border-top: 0; }

/* Pastki nav — faqat mobil */
.mobile-bottom-nav { display: none; }
.bottom-link { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; min-height: 50px; color: var(--text-tertiary); text-decoration: none; font-size: 10px; font-weight: 500; line-height: 1; }
.bottom-link[aria-current="page"] { color: var(--accent); }

.site-footer { width: min(var(--content-width), calc(100% - 64px)); margin: 56px auto 0; padding: 18px 0 24px; display: flex; justify-content: space-between; gap: 16px; border-top: 1px solid var(--border-subtle); color: var(--text-tertiary); font-size: 12px; }

:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; border-radius: 4px; }

@media (max-width: 900px) {
  body { padding-bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom)); }
  .header-inner { width: calc(100% - 24px); gap: 8px; }
  .desktop-nav, .desktop-only { display: none; }
  .mobile-menu-button { display: inline-grid; }
  .mobile-bottom-nav { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: grid; grid-template-columns: repeat(5, 1fr); min-height: var(--bottom-nav-height); padding: 4px 8px env(safe-area-inset-bottom); border-top: 1px solid var(--border-subtle); background: var(--canvas); transition: transform 220ms var(--ease-out); }
  @supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
    .mobile-bottom-nav { background: var(--panel-veil); -webkit-backdrop-filter: blur(14px) saturate(120%); backdrop-filter: blur(14px) saturate(120%); }
  }
  /* O'qish rejimida pastki nav ham ketadi: matn to'liq ekranga chiqadi. */
  [data-reading="hidden"] .mobile-bottom-nav { transform: translateY(100%); }
  .site-footer { width: calc(100% - 48px); flex-direction: column; gap: 6px; }
}