/* store.css — «Библиотека номер один», one file, no framework.
   Budget (Q.1): <= 14 KB raw / <= 4 KB gzip site-wide; system fonts only (Q.4).
   Colour pairs are --<role>-fg/--<role>-bg, used as a pair; ratios from plan R.3
   and recomputed by test_contrast_tokens_are_aa. The two FORBIDDEN pairs fail AA
   on purpose: no rule may apply them via var() (enforced by a test). */

:root {
  --pair-dark-fg: #f3eee2;
  --pair-dark-bg: #1c243c;
  --pair-accent-on-dark-fg: #c4a46a;
  --pair-accent-on-dark-bg: #1c243c;
  --pair-cta-fg: #1c243c;
  --pair-cta-bg: #c4a46a;
  --pair-body-fg: #23201c;
  --pair-body-bg: #f3eee2;
  --pair-muted-fg: #6b655a;
  --pair-muted-bg: #f3eee2;
  --pair-caption-fg: #5a544a;
  --pair-caption-bg: #f3eee2;
  --pair-chip-fg: #7a5c1e;
  --pair-chip-bg: #f3eee2;

  /* FORBIDDEN pairs — ratio 2.05, FAILS AA on purpose. Gold never as text on a
     light background, cream never as text on gold. Documentation only: no rule
     in this file may reference them via var() (enforced by test).          */
  --forbidden-gold-on-cream-fg: #c4a46a;
  --forbidden-gold-on-cream-bg: #f3eee2;
  --forbidden-cream-on-gold-fg: #f3eee2;
  --forbidden-cream-on-gold-bg: #c4a46a;

  --ring-on-light: #1c243c;
  --ring-on-dark: #f3eee2;

  --font-display: Georgia, "Times New Roman", "PT Serif", serif;
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --cover-ratio: 2 / 3;   /* every cover, always — CLS stays zero (Q.1) */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--pair-body-fg);
  background-color: var(--pair-body-bg);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  margin: 0 0 var(--space-3);
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--ring-on-light);
  outline-offset: 2px;
}

.site-header,
.site-footer {
  background-color: var(--pair-dark-bg);
  color: var(--pair-dark-fg);
}

.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--ring-on-dark);
}

.btn {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.2;
  padding: var(--space-3) var(--space-5);
  border: 0;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: filter 120ms ease, box-shadow 120ms ease;
}

.btn-primary {
  background-color: var(--pair-cta-bg);
  color: var(--pair-cta-fg);
}

.btn-primary:hover {
  filter: brightness(0.94);
}

.btn-primary:active {
  filter: brightness(0.88);
}

.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.75;
}

.cover-frame {
  aspect-ratio: var(--cover-ratio);
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.cover-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@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;
  }
}

.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 10;
  padding: var(--space-2) var(--space-4);
  background-color: var(--pair-dark-bg);
  color: var(--pair-dark-fg);
}
.skip-link:focus {
  left: 0;
}

.header-inner,
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  align-items: baseline;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}
.brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  text-decoration: none;
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

/* phase 11: informational pages + the multi-column footer */
.info-lead {
  font-size: 1.0625rem;
  line-height: 1.6;
}
.footer-cols {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  justify-content: space-between;
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}
.footer-col h2 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-ui);
  font-size: .875rem;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.footer-col ul {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-col a {
  color: inherit;
  text-decoration: none;
}
.footer-col a:hover {
  text-decoration: underline;
}
.footer-note {
  margin-left: auto;
  text-align: right;
}
@media (max-width: 40rem) {
  .footer-note {
    margin-left: 0;
    text-align: left;
  }
}

/* phase 12: in-page listening + trailer facades (lazy YouTube) */
.listen-block {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(128, 128, 128, .35);
}
.listen-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-ui);
  font-weight: 600;
}
.listen-note {
  margin: var(--space-2) 0 0;
  color: #555;
  font-size: .875rem;
}
.listen-block audio {
  width: 100%;
}
.yt-slot iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: var(--radius-sm);
}
.slider-wrap {
  position: relative;
  margin-bottom: var(--space-5);
}
.trailer-slider {
  display: flex;
  gap: var(--space-4);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 0 var(--space-1) var(--space-3);
  margin: 0;
  list-style: none;
  scrollbar-width: thin;
}
.trailer-card {
  flex: 0 0 12.5rem;
  scroll-snap-align: start;
}
.trailer-slot {
  position: relative;
  aspect-ratio: 9 / 16;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: #101010;
}
.trailer-play {
  position: absolute;
  inset: 0;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}
.trailer-play img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;          /* vertical source: crops the side bars away */
  object-position: center;
}
.trailer-play::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 45%, rgba(0, 0, 0, .55));
}
.trailer-play-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: rgba(0, 0, 0, .62);
  color: #fff;
  font-size: 1.05rem;
  transform: translate(-50%, -50%);
}
.slider-btn {
  position: absolute;
  top: 40%;
  z-index: 3;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  border-radius: 50%;
  background: var(--pair-cta-bg);
  color: var(--pair-cta-fg);
  font-size: 1.1rem;
  cursor: pointer;
}
.slider-prev { left: -0.75rem; }
.slider-next { right: -0.75rem; }
.trailer-title {
  margin: var(--space-2) 0 0;
}
.trailer-title a {
  color: inherit;
  text-decoration: none;
}
.trailer-title a:hover {
  text-decoration: underline;
}
.trailer-author {
  margin: 0;
  color: #555;
  font-size: .875rem;
}
.yt-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: rgba(0, 0, 0, .82);
}
.yt-modal-box {
  height: min(82vh, 46rem);   /* portrait player for vertical trailers */
}
.yt-modal-box iframe {
  height: 100%;
  aspect-ratio: 9 / 16;
  border: 0;
  border-radius: var(--radius-sm);
}
.yt-modal-close {
  margin-top: var(--space-3);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-5);
  padding: 0;
  list-style: none;
  font-size: 0.875rem;
  color: var(--pair-muted-fg);
}

.book-head {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}
@media (min-width: 768px) {
  .book-head {
    grid-template-columns: minmax(200px, 320px) 1fr;
  }
}
.book-cover {
  margin: 0;
  max-width: 320px;
}
.byline {
  font-size: 1.125rem;
  color: var(--pair-caption-fg);
}
.chip {
  display: inline-block;
  padding: 0.125rem var(--space-3);
  border-radius: 999px;
  background-color: var(--pair-chip-bg);
  color: var(--pair-chip-fg);
  font-size: 0.875rem;
}

.buy-box {
  margin-top: var(--space-5);
  padding: var(--space-4) 0;
  border-top: 1px solid rgba(35, 32, 28, 0.15);
}
.price {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
}
.buy-status {
  color: var(--pair-muted-fg);
  font-size: 0.875rem;
}

.format-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}
.fmt {
  font-weight: 600;
  margin-right: var(--space-1);
}

.prose {
  font-family: var(--font-display);
  line-height: 1.65;
  max-width: 46em;
  margin-top: var(--space-5);
}
.prose p {
  margin: 0 0 1em;
}
.prose h2 {
  font-size: 1.375rem;
  margin: 1.5em 0 0.75em;
}
.fragment-end {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 2px solid rgba(35, 32, 28, 0.15);
  font-family: var(--font-ui);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-5) var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}
.book-card a {
  display: block;
  text-decoration: none;
}
.cover-card {
  border-radius: var(--radius-sm);
}
.card-title {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-display);
  line-height: 1.3;
}
.card-author {
  display: block;
  color: var(--pair-caption-fg);
  font-size: 0.875rem;
}

.pagination ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
}
.pagination a,
.pagination .pagination-current,
.pagination span[aria-disabled] {
  display: inline-block;
  min-width: 2.5rem;
  padding: var(--space-1) var(--space-2);
  text-align: center;
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.pagination .pagination-current {
  background-color: var(--pair-dark-bg);
  color: var(--pair-dark-fg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--pair-body-fg);
  border: 2px solid var(--pair-body-fg);
}
.btn-secondary:hover {
  background-color: rgba(35, 32, 28, 0.06);
}
.btn-ghost {
  background: none;
  color: var(--pair-caption-fg);
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}
.btn-ghost:hover {
  filter: brightness(0.92);
}

.price-kind {
  font-size: 1rem;
  color: var(--pair-muted-fg);
}
.formats-line,
.bundle-note,
.series-line {
  color: var(--pair-muted-fg);
  font-size: 0.875rem;
}
.orig-title {
  color: var(--pair-caption-fg);
  font-style: italic;
}

.details {
  margin: 0;
}
.details div {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-2) 0;
  border-bottom: 1px solid rgba(35, 32, 28, 0.12);
}
@media (max-width: 767px) {
  .details div {
    display: block;
  }
}
.details dt {
  flex: 0 0 11rem;
  color: var(--pair-muted-fg);
  font-weight: 600;
}
@media (max-width: 767px) {
  .details dt {
    flex-basis: auto;
  }
}
.details dd {
  margin: 0;
}

.matter p {
  margin: 0 0 var(--space-3);
}
.legal-note {
  margin-top: var(--space-5);
  font-size: 0.875rem;
  color: var(--pair-caption-fg);
}

.author-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
}
.other-by a {
  color: var(--pair-body-fg);
}

.book-grid .book-card h3.card-author {
  margin: var(--space-1) 0 0;
  font-size: 0.875rem;
  font-family: var(--font-ui);
  color: var(--pair-caption-fg);
}

.sticky-buy {
  display: none;
}
@media (max-width: 767px) {
  .sticky-buy {
    position: sticky;
    bottom: 0;
    z-index: 5;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) 0 calc(var(--space-2) + env(safe-area-inset-bottom));
    background-color: var(--pair-body-bg);
    border-top: 1px solid rgba(35, 32, 28, 0.2);
  }
  .sticky-buy .buy-button {
    flex: 1;
    min-height: 48px;
  }
  .listen-icon {
    font-size: 1.5rem;
    color: var(--pair-caption-fg);
    text-decoration: none;
    line-height: 1;
  }
  .buy-box .btn-primary.buy-button {
    display: none;
  }
  .read-action,
  .listen-action {
    display: block;
    width: 100%;
    min-height: 48px;
    text-align: center;
  }
}

@media (min-width: 768px) {
  .book-cover {
    max-width: 300px;
  }
}
@media (max-width: 767px) {
  .book-head {
    grid-template-columns: 1fr;
  }
  .book-cover {
    margin-inline: auto;
    max-width: min(480px, 62vw);
  }
}

@media (max-width: 767px) {
  .book-grid.similar {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    gap: var(--space-4);
    padding-bottom: var(--space-2);
  }
  .book-grid.similar .book-card {
    flex: 0 0 9rem;
    scroll-snap-align: start;
  }
}
@media (prefers-reduced-motion: reduce) {
  .book-grid.similar {
    display: grid;
    overflow-x: visible;
    scroll-snap-type: none;
  }
  .book-grid.similar .book-card {
    flex: auto;
  }
}

.vh {                                     /* visually hidden a11y heading (R.2) */
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.section-sub { color: var(--pair-muted-fg); margin-top: calc(-1 * var(--space-2)); }
.more-link, .listen-line { margin: var(--space-3) 0 0; }
.imprint { color: var(--pair-caption-fg); font-size: 0.875rem; margin-top: var(--space-6); }

.card-annotation {
  margin: var(--space-2) 0 0; font-size: 0.875rem; color: var(--pair-muted-fg);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.card-foot { display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-2); flex-wrap: wrap; }
.card-price { font-weight: 600; }
.card-audio { color: var(--pair-caption-fg); font-size: 0.875rem; text-decoration: none; }

.catalog-tools { margin: var(--space-4) 0 var(--space-6); display: grid; gap: var(--space-2); }
.tools-row { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-1) var(--space-2); }
.tools-label { color: var(--pair-muted-fg); font-size: 0.875rem; margin-right: var(--space-1); }
.tool-btn {
  border: 1px solid rgba(35, 32, 28, 0.3); background: none; border-radius: 999px;
  padding: 0.25rem 0.75rem; font-size: 0.875rem; cursor: pointer; color: var(--pair-body-fg);
}
.tool-btn.is-active { background-color: var(--pair-dark-bg); color: var(--pair-dark-fg); border-color: var(--pair-dark-bg); }
.tools-sep { width: 1px; height: 1.25rem; background: rgba(35, 32, 28, 0.25); margin-inline: var(--space-1); }

.genres-list { list-style: none; margin: 0 0 var(--space-4); padding: 0; display: grid; gap: var(--space-2); }
.genre-row { display: flex; align-items: baseline; gap: var(--space-3); flex-wrap: wrap; }
.genre-row > a { font-family: var(--font-display); font-size: 1.125rem; text-decoration: none; }
.genre-count { color: var(--pair-muted-fg); font-size: 0.875rem; }

.hero { padding: var(--space-6) 0 var(--space-4); border-bottom: 1px solid rgba(35, 32, 28, 0.15); margin-bottom: var(--space-6); }

.authors-index { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--space-4); }
.author-letter h2 { font-size: 1.125rem; margin-bottom: var(--space-2); }
.author-index-list { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: var(--space-4); }
@media (max-width: 767px) { .author-index-list { columns: 1; } }

.search-form { max-width: 36rem; margin-bottom: var(--space-5); }
.search-row { display: flex; gap: var(--space-2); margin-top: var(--space-2); }
.search-row input[type="search"] {
  flex: 1; font-size: 1rem; padding: 0.5rem 0.75rem; color: var(--pair-body-fg);
  border: 2px solid rgba(35, 32, 28, 0.4); border-radius: var(--radius-sm); background-color: #fff;
}
.search-hint, .search-empty { color: var(--pair-muted-fg); }

.not-found-links { list-style: none; padding: 0; display: flex; gap: var(--space-4); flex-wrap: wrap; }