/* BILIM UZ refinement layer: shared semantic foundation without changing page flows. */
:root {
  --brand-navy: #032972;
  --brand-gold: #f2b72a;
  --color-primary: var(--brand-navy);
  --color-primary-soft: #0b3b8f;
  --color-primary-hover: #02215c;
  --color-on-primary: #fff;
  --color-background: #f5f7fb;
  --color-surface-muted: #f8fafc;
  --color-text-secondary: #64748b;
  --color-border-strong: #d8e0ea;
  --color-focus: #2563eb;
  --color-success: #047857;
  --color-warning: #a16207;
  --color-error: #b91c1c;
  --radius-control: 10px;
  --radius-card: 16px;
  --radius-container: 22px;
  --shadow-sm: 0 1px 2px rgba(11, 27, 50, .04), 0 6px 18px rgba(11, 27, 50, .04);
  --shadow-md: 0 14px 36px rgba(11, 27, 50, .09);
  --motion-fast: 180ms cubic-bezier(.2, .8, .2, 1);
  --motion-base: 240ms cubic-bezier(.2, .8, .2, 1);
  --content-wide: 1400px;
}

html[data-theme="dark"] {
  --color-background: #08111f;
  --color-surface-muted: #142238;
  --color-text-secondary: #a8b6c9;
  --color-border-strong: rgba(183, 199, 219, .2);
  --color-focus: #7db0ff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .18), 0 8px 22px rgba(0, 0, 0, .14);
  --shadow-md: 0 16px 40px rgba(0, 0, 0, .28);
}

html { scroll-behavior: smooth; }
body { color: var(--color-text); background: var(--color-background); line-height: 1.55; }
button, a, input, select, textarea { touch-action: manipulation; }
button, [role="button"], a[href], select { cursor: pointer; }

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-focus) 72%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed; left: 16px; top: 12px; z-index: 11000; transform: translateY(-160%);
  padding: 10px 14px; border-radius: var(--radius-control); background: #fff; color: #0b1b32;
  font-weight: 700; box-shadow: var(--shadow-md); transition: transform var(--motion-fast);
}
.skip-link:focus { transform: translateY(0); }

.page-shell { max-width: var(--content-wide); padding-inline: clamp(16px, 3vw, 40px); }
.section-block { margin-block: clamp(32px, 5vw, 64px); }
.section-head { margin-bottom: 20px; gap: 16px; }
.section-title { font-family: "Lora", Georgia, serif; font-size: clamp(1.25rem, 2vw, 1.65rem); line-height: 1.25; color: var(--color-text); }
.section-link { min-height: 44px; padding-inline: 10px; border-radius: var(--radius-control); color: var(--color-text-secondary); }
.section-link:hover { color: var(--color-primary); background: var(--color-surface-muted); }

#mainHeaderWrapper { box-shadow: 0 4px 20px rgba(11, 27, 50, .07) !important; }
.site-header {
  background: var(--color-primary) !important;
  backdrop-filter: blur(9px);
  -webkit-backdrop-filter: blur(9px);
}
.site-header__inner { min-height: 68px; }
.site-logo {
  display: inline-flex; flex: 0 0 auto; align-items: center; color: #fff;
  min-width: 0; margin-right: clamp(12px, 2vw, 28px); transform: none;
  opacity: 1; transition: opacity var(--motion-fast);
}
.site-logo:hover { opacity: .9; }
.bilim-logo { display: block; width: auto; height: 44px; overflow: visible; }
.bilim-logo--compact { display: none; height: 42px; max-width: 158px; }
.header-search { border-radius: 12px; transition: border-color var(--motion-fast), box-shadow var(--motion-fast), background var(--motion-fast); }
.header-search:focus-within { border-color: rgba(212, 175, 55, .72); box-shadow: 0 0 0 3px rgba(212, 175, 55, .16); }
.icon-btn { width: 44px !important; height: 44px !important; border-radius: var(--radius-control) !important; transition: color var(--motion-fast), border-color var(--motion-fast), background var(--motion-fast); }
.site-header .icon-btn {
  border-color: rgba(255, 255, 255, .18) !important;
  background: rgba(255, 255, 255, .08) !important;
  color: #fff !important;
  box-shadow: none !important;
}
.site-header .icon-btn:hover,
.site-header .icon-btn:focus-visible,
.site-header .icon-btn[aria-expanded="true"] {
  transform: none;
  border-color: rgba(242, 183, 42, .7) !important;
  background: rgba(255, 255, 255, .14) !important;
  color: var(--brand-gold) !important;
}
.site-header .dropdown-menu {
  border: 1px solid rgba(255, 255, 255, .14) !important;
  background: var(--color-primary) !important;
  box-shadow: var(--shadow-md) !important;
}
.site-header .dropdown-item {
  color: rgba(255, 255, 255, .86) !important;
  background: transparent !important;
}
.site-header .dropdown-item:hover,
.site-header .dropdown-item:focus-visible {
  color: #fff !important;
  background: rgba(255, 255, 255, .1) !important;
}
.site-header .dropdown-item.active {
  color: var(--color-primary) !important;
  background: var(--brand-gold) !important;
}
.secondary-nav__inner { gap: 6px; padding-block: 7px; }
.secondary-nav a { min-width: auto; min-height: 42px; height: 42px; padding: 0 12px; border-color: transparent; background: transparent; box-shadow: none; transition: color var(--motion-fast), background var(--motion-fast), border-color var(--motion-fast); }
.secondary-nav a i { width: 28px; height: 28px; background: color-mix(in srgb, var(--color-primary) 7%, transparent); color: var(--color-primary); }
.secondary-nav a:hover, .secondary-nav a:focus-visible { border-color: var(--color-border); background: var(--color-surface); color: var(--color-primary); }
.secondary-nav a.is-active { border-color: color-mix(in srgb, var(--color-accent) 38%, var(--color-border)); background: color-mix(in srgb, var(--color-accent) 9%, var(--color-surface)); color: var(--color-primary); }

:where(.card, .authors-card, .categories-card, .auth-card, .cart-item, .cart-summary) {
  border-color: var(--color-border) !important; box-shadow: var(--shadow-sm) !important;
}
.catalog-product-card { border-radius: var(--radius-card); border-color: var(--color-border); box-shadow: var(--shadow-sm); transition: transform var(--motion-base), box-shadow var(--motion-base), border-color var(--motion-base); }
.catalog-product-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--color-accent) 34%, var(--color-border)); }
.catalog-product-card:hover .product-image-link img { transform: scale(1.018); }
.catalog-product-card .product-image-link img { transition: transform var(--motion-base); }
.catalog-product-card .product-title { line-height: 1.35; }
.catalog-product-card .product-price-block strong { font-variant-numeric: tabular-nums; }
.catalog-product-card .add-to-cart-btn { min-height: 44px; border-radius: var(--radius-control); transition: background var(--motion-fast), color var(--motion-fast), border-color var(--motion-fast), opacity var(--motion-fast); }
.catalog-product-card .favorite-btn { min-width: 44px; min-height: 44px; }

:where(.btn, .form-control, .form-select) { min-height: 44px; border-radius: var(--radius-control); }
:where(.form-control, .form-select):focus { border-color: var(--color-focus); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus) 16%, transparent); }
.btn-primary { background: var(--color-primary); border-color: var(--color-primary); font-weight: 700; }
.btn-primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }
.btn:disabled, button:disabled { cursor: not-allowed; opacity: .5; }

.register-page .auth-shell { padding-top: 28px; }
.register-page .auth-panel { max-width: 980px; gap: 28px; }
.register-page .auth-heading { margin-bottom: 18px; }
.register-page .auth-card { border-radius: 20px; padding: 28px; }
.register-page .auth-field { margin-bottom: 18px; }
.register-page .auth-card .form-label { margin-bottom: 7px; font-size: .9rem; }
.register-page .auth-card .form-control { min-height: 50px; border-radius: 12px; background: var(--color-surface); box-shadow: inset 0 1px 2px rgba(11, 27, 50, .04); }
.register-page .auth-card .form-control:focus { border-color: var(--brand-navy); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-navy) 15%, transparent); }
.register-page .auth-password-control { position: relative; }
.register-page .auth-password-control .form-control { padding-right: 52px; }
.register-page .auth-password-toggle { position: absolute; top: 3px; right: 3px; width: 44px; height: 44px; display: grid; place-items: center; border: 0; border-radius: 10px; background: transparent; color: var(--color-text-secondary); }
.register-page .auth-password-toggle:hover,
.register-page .auth-password-toggle:focus-visible { background: var(--color-surface-muted); color: var(--brand-navy); }
.register-page .auth-password-hint { display: flex; align-items: flex-start; gap: 8px; margin: -2px 0 18px; color: var(--color-text-secondary); font-size: .8rem; line-height: 1.45; }
.register-page .auth-password-hint i { flex: 0 0 auto; color: var(--brand-navy); }
.register-page .auth-card > .btn-primary { min-height: 50px; border-radius: 12px; }
.register-page .auth-promo { border-radius: 20px; border-left: 4px solid var(--brand-gold) !important; }
.register-page .google-btn-wrapper { min-height: 44px; }
:where(.login-page, .register-page) .auth-divider { display: flex; align-items: center; gap: 12px; margin: 20px 0 16px; color: var(--color-text-secondary); font-size: .8rem; }
:where(.login-page, .register-page) .auth-divider::before,
:where(.login-page, .register-page) .auth-divider::after { content: ""; flex: 1; height: 1px; background: var(--color-border); }
:where(.login-page, .register-page) .auth-divider span { padding-inline: 4px; }
:where(.login-page, .register-page) .google-auth-area { min-height: 44px; }
:where(.login-page, .register-page) .google-btn-wrapper { display: flex; min-height: 44px; justify-content: center; overflow: hidden; border-radius: 8px; }
:where(.login-page, .register-page) .google-btn-wrapper > div { max-width: 100% !important; }
:where(.login-page, .register-page) .google-auth-status { min-height: 18px; margin: 8px 0 0; color: var(--color-danger, #b42318); font-size: .78rem; text-align: center; }

.catalog-toast { box-shadow: var(--shadow-md) !important; transition: transform var(--motion-base), opacity var(--motion-base) !important; }
.site-message { border-radius: var(--radius-control); }

.bottom-nav {
  --bottom-nav-surface: #071a36;
  --bottom-nav-muted: #9fb1ca;
  --bottom-nav-active: #ffc400;
  position: fixed !important;
  inset: auto 0 0 0 !important;
  width: 100% !important;
  max-width: none !important;
  margin: 0 !important;
  min-height: calc(64px + env(safe-area-inset-bottom));
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom)) !important;
  border: 1px solid rgba(255, 255, 255, .08) !important;
  border-bottom: 0 !important;
  border-radius: 16px 16px 0 0 !important;
  background: var(--bottom-nav-surface) !important;
  box-shadow: 0 -10px 28px rgba(2, 12, 27, .24) !important;
  backdrop-filter: none;
  overflow: visible;
  z-index: 10040 !important;
}
.bottom-link {
  position: relative;
  min-width: 0;
  min-height: 50px !important;
  gap: 3px !important;
  justify-content: center;
  border-radius: 12px;
  color: var(--bottom-nav-muted) !important;
  font-size: 10px !important;
  font-weight: 600;
  line-height: 1.1;
  transition: color var(--motion-fast), background var(--motion-fast), transform var(--motion-fast);
}
.bottom-link i { font-size: 19px !important; line-height: 1; }
.bottom-link span { max-width: 100%; overflow: hidden; text-overflow: ellipsis; overflow-wrap: normal; white-space: nowrap; }
.bottom-link.active {
  color: var(--bottom-nav-active) !important;
  background: rgba(255, 196, 0, .10);
  transform: none !important;
}
.bottom-link.active i { color: inherit !important; transform: none !important; }
.bottom-link:active { transform: scale(.96); background: rgba(255, 255, 255, .08); }
.bottom-link:focus-visible { outline: 2px solid var(--bottom-nav-active); outline-offset: -2px; }
.bottom-link__avatar {
  width: 22px;
  height: 22px;
  border: 1px solid rgba(255, 255, 255, .45);
  border-radius: 50%;
  object-fit: cover;
}
.bottom-link.active .bottom-link__avatar { border: 2px solid var(--bottom-nav-active); }
.bottom-nav .bottom-count {
  top: 2px !important;
  right: calc(50% - 22px) !important;
  min-width: 17px;
  height: 17px;
  padding: 0 4px;
  border: 2px solid var(--bottom-nav-surface);
  font-size: 9px;
  line-height: 13px;
}

@media (max-width: 767.98px) {
  body { padding-bottom: calc(64px + env(safe-area-inset-bottom)); }

  .register-page .auth-shell { padding: 12px 0 20px; }
  .register-page .auth-panel { gap: 18px; }
  .register-page .auth-promo { padding: 18px; border-radius: 16px; box-shadow: none !important; }
  .register-page .auth-promo::after { width: 46px; height: 46px; inset: 16px 16px auto auto; font-size: 22px; }
  .register-page .auth-promo-badge { width: 44px; height: 44px; font-size: 21px; }
  .register-page .auth-promo-title { max-width: calc(100% - 54px); margin-top: 14px; font-size: 1.3rem; }
  .register-page .auth-promo-text { line-height: 1.55; }
  .register-page .auth-promo-list { grid-template-columns: 1fr; margin-top: 14px; }
  .register-page .auth-heading { margin: 0 0 14px; }
  .register-page .auth-title { font-size: 1.5rem; }
  .register-page .auth-subtitle { margin-top: 6px; line-height: 1.45; }
  .register-page .auth-card { padding: 18px; border-radius: 16px; }
  .register-page .auth-field { margin-bottom: 15px; }
  .register-page .auth-card .form-control { min-height: 48px; }
  .register-page .auth-password-toggle { top: 2px; }

  .site-header .header-search {
    grid-template-columns: auto minmax(0, 1fr) !important;
  }

  .site-header .header-search button {
    display: none !important;
  }

  body.home-page .hero-card {
    padding: 0 !important;
    border: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
  }

  main.site-main.bilim-bg-shell {
    height: auto !important;
    min-height: 0 !important;
  }
  .page-shell {
    height: auto !important;
    min-height: 0 !important;
    padding-inline: 14px;
    padding-bottom: 12px !important;
  }
  .home-products-shell { height: auto; min-height: 0; }
  .bilim-bg-skyline { display: none; }
  .site-footer { display: none !important; }
  .section-block { margin-block: 28px; }
  .section-head { margin-bottom: 14px; }
  .section-title { font-size: 1.15rem; }
  .catalog-product-card:hover { transform: none; box-shadow: var(--shadow-sm); }
  .catalog-product-card:hover .product-image-link img { transform: none; }
  .icon-btn { width: 44px !important; height: 44px !important; }
  .secondary-nav a { min-height: 44px; height: 44px; }

  body.home-page main.site-main.bilim-bg-shell,
  body.home-page main.site-main > .page-shell {
    display: block !important;
    height: auto !important;
    min-height: 0 !important;
  }

  body.home-page .home-products-shell,
  body.home-page .bilim-bg-books,
  body.home-page .premium-product-grid {
    height: auto !important;
    min-height: 0 !important;
    padding-bottom: 0 !important;
    margin-bottom: 0 !important;
  }

  body.home-page .bilim-bg-books::before,
  body.home-page .bilim-bg-books::after {
    display: none !important;
  }

  body.home-page .section-block:last-child {
    margin-bottom: 0 !important;
  }

  body.home-page .site-footer { display: none !important; }
}

@media (min-width: 768px) {
  .bottom-nav { display: none !important; }
}

@media (max-width: 991.98px) {
  .bilim-logo--full { display: none; }
  .bilim-logo--compact { display: block; }
  .site-logo { min-width: 48px; min-height: 44px; justify-content: flex-start; }
}

@media (max-width: 374.98px) {
  .bilim-logo--compact { height: 38px; max-width: 143px; }
  .site-logo { margin-right: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}