/* ============================================================
   DL-library.uz — MAXSUS IMKONIYATLAR uslublari

   Ushbu fayl faqat ko'zi ojiz va zaif ko'ruvchi foydalanuvchilar
   uchun mo'ljallangan: panel ko'rinishi, yuqori kontrast rejimi,
   kulrang rejim, harflar oralig'i va klaviatura fokusi.
   ============================================================ */

/* Shrift o'lchami paneldan boshqariladi.
   html elementiga qo'llanadi, shuning uchun rem asosidagi
   barcha o'lchamlar mutanosib ravishda kattalashadi. */
:root {
  --a11y-font-scale: 100%;
}

html {
  font-size: var(--a11y-font-scale);
}

/* ============================================================
   1. "ASOSIY KONTENTGA O'TISH" HAVOLASI
   Klaviatura foydalanuvchisi Tab bosganda birinchi bo'lib
   shu havola chiqadi va menyuni o'tkazib yuborish imkonini beradi.
   ============================================================ */

.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 2000;
  padding: 12px 20px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--primary-600);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

/* ============================================================
   2. PANELNI OCHISH TUGMASI (header ichida)
   ============================================================ */

.a11y-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-size: 1.05rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.a11y-toggle:hover,
.a11y-toggle[aria-expanded="true"] {
  border-color: var(--primary-500);
  color: var(--primary-500);
  background: rgba(102, 126, 234, 0.1);
}

/* ============================================================
   3. PANELNING O'ZI
   ============================================================ */

.a11y-panel {
  position: fixed;
  top: calc(var(--header-height) + 8px);
  right: 12px;
  z-index: 1100;
  width: min(320px, calc(100vw - 24px));
  padding: 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
  box-shadow: var(--shadow-modal);
  animation: a11ySlideIn 0.25s ease-out;
}

@keyframes a11ySlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.a11y-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.a11y-panel__title {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.a11y-panel__close {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
}

.a11y-panel__close:hover {
  border-color: var(--primary-500);
  color: var(--primary-500);
}

.a11y-panel__group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.a11y-panel__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.a11y-font-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.a11y-font-value {
  flex: 1;
  text-align: center;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.a11y-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.a11y-btn:hover {
  border-color: var(--primary-500);
  background: rgba(102, 126, 234, 0.1);
}

.a11y-btn.is-active {
  border-color: var(--primary-500);
  background: var(--gradient-primary);
  color: #fff;
}

.a11y-btn--icon {
  width: auto;
  justify-content: center;
  min-width: 52px;
  font-weight: 700;
}

.a11y-btn--reset {
  justify-content: center;
  font-weight: 600;
}

.a11y-panel__hint {
  margin: 10px 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

/* ============================================================
   4. YUQORI KONTRAST REJIMI
   Qora fon + sariq matn — zaif ko'ruvchilar uchun eng ko'p
   so'raladigan kombinatsiya (kontrast nisbati ~19:1).
   ============================================================ */

.a11y-contrast body,
.a11y-contrast .navbar,
.a11y-contrast .hero,
.a11y-contrast .controls,
.a11y-contrast .books-section,
.a11y-contrast .dynamic-view-section,
.a11y-contrast .footer {
  background: #000 !important;
  color: #ff0 !important;
}

.a11y-contrast .book-card,
.a11y-contrast .material-card,
.a11y-contrast .stat,
.a11y-contrast .quiz-card,
.a11y-contrast .quiz-result-card,
.a11y-contrast .a11y-panel,
.a11y-contrast .pres-viewer,
.a11y-contrast .video-page__about,
.a11y-contrast .toast {
  background: #000 !important;
  border: 2px solid #ff0 !important;
  box-shadow: none !important;
}

.a11y-contrast h1, .a11y-contrast h2, .a11y-contrast h3,
.a11y-contrast h4, .a11y-contrast p, .a11y-contrast span,
.a11y-contrast div, .a11y-contrast label, .a11y-contrast output,
.a11y-contrast summary, .a11y-contrast strong, .a11y-contrast li {
  color: #ff0 !important;
}

.a11y-contrast a,
.a11y-contrast .nav-tab-btn,
.a11y-contrast .filter-btn {
  color: #0ff !important;
}

.a11y-contrast button,
.a11y-contrast .btn,
.a11y-contrast input,
.a11y-contrast select,
.a11y-contrast textarea {
  background: #000 !important;
  color: #ff0 !important;
  border: 2px solid #ff0 !important;
  background-image: none !important;
}

/* Aktiv holatlar teskari rangda — aniq ajralib tursin */
.a11y-contrast .btn--primary,
.a11y-contrast .btn-primary,
.a11y-contrast .filter-btn.active,
.a11y-contrast .nav-tab-btn.active,
.a11y-contrast .pagination-btn.active,
.a11y-contrast .a11y-btn.is-active {
  background: #ff0 !important;
  color: #000 !important;
}

/* Bezak elementlari chalg'itmasligi uchun o'chiriladi */
.a11y-contrast .neural-bg,
.a11y-contrast .bg-decoration {
  display: none !important;
}

/* ============================================================
   5. KULRANG (GRAYSCALE) REJIM
   Rang ko'rish buzilishi bo'lganlar uchun.
   ============================================================ */

.a11y-grayscale body {
  filter: grayscale(100%);
}

/* ============================================================
   6. HARFLAR VA QATORLAR ORALIG'I
   Disleksiya va zaif ko'rishda o'qishni osonlashtiradi.
   ============================================================ */

.a11y-spacing body {
  letter-spacing: 0.09em !important;
  word-spacing: 0.16em !important;
  line-height: 1.9 !important;
}

.a11y-spacing h1, .a11y-spacing h2,
.a11y-spacing h3, .a11y-spacing h4 {
  line-height: 1.5 !important;
}

/* ============================================================
   7. HAVOLALARNI AJRATIB KO'RSATISH
   ============================================================ */

.a11y-links a,
.a11y-links .nav-tab-btn,
.a11y-links .filter-btn {
  text-decoration: underline !important;
  text-underline-offset: 3px !important;
  text-decoration-thickness: 2px !important;
  outline: 2px dashed currentColor;
  outline-offset: 2px;
}

/* ============================================================
   8. RASMLARNI YASHIRISH
   Faqat matnga e'tibor qaratmoqchi bo'lganlar uchun.
   ============================================================ */

.a11y-no-images img,
.a11y-no-images canvas,
.a11y-no-images .book-card__cover-wrapper,
.a11y-no-images .material-card__media,
.a11y-no-images .neural-bg,
.a11y-no-images .bg-decoration,
.a11y-no-images .hero__logo {
  display: none !important;
}

/* ============================================================
   9. KLAVIATURA BILAN BOSHQARISH
   Fokus har doim aniq ko'rinib turishi shart (WCAG 2.4.7).
   ============================================================ */

:focus-visible {
  outline: 3px solid var(--primary-500);
  outline-offset: 2px;
  border-radius: 4px;
}

.a11y-contrast :focus-visible {
  outline: 3px solid #ff0;
}

/* Faqat skrinrider o'qiydigan matn (ekranda ko'rinmaydi) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   10. ANIMATSIYALARNI KAMAYTIRISH
   Foydalanuvchi tizim sozlamalarida animatsiyani o'chirgan
   bo'lsa hurmat qilamiz (vestibulyar buzilishlar uchun muhim).
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .neural-bg,
  .bg-decoration {
    display: none !important;
  }
}

/* ============================================================
   11. MOBIL MOSLASHUV
   ============================================================ */

@media (max-width: 680px) {
  .a11y-panel {
    left: 12px;
    right: 12px;
    width: auto;
  }
}