/*
 * Catalog-specific layer for books.html.
 * Shared site chrome, tokens and compact service controls live in
 * forest-chrome.css; this file deliberately contains only the book catalog.
 */
.page-books {
  --books-paper: #f7f0df;
  --books-paper-card: #fff9ed;
  --books-ink: #153427;
  --books-border: #d9c99d;
  --books-shadow: 0 12px 26px rgba(18, 47, 31, 0.18);
  --books-shadow-hover: 0 18px 32px rgba(18, 47, 31, 0.26), 0 0 20px rgba(232, 207, 115, 0.16);
  /* The forest library artwork is intentionally fixed to the viewport.
     Content scrolls above it; the original panels and their mechanics stay live. */
  background-color: #f7f0df;
  background-image:
    linear-gradient(90deg, rgba(7, 34, 20, 0.08), transparent 18%, transparent 82%, rgba(7, 34, 20, 0.08)),
    url('images/books-children-fixed-library-v1.png');
  background-position: center top;
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  color: var(--books-ink);
}

.page-books .banner {
  min-height: 430px;
  align-items: flex-end;
  padding: 118px 24px 58px;
  background-position: center top;
}
.page-books .banner::after {
  background: linear-gradient(180deg, rgba(3, 19, 12, 0.48), rgba(3, 20, 12, 0.86));
}
.page-books .banner-inner {
  width: min(100%, 1120px);
  max-width: 1120px;
  padding: 0;
}
.page-books .banner .page-title {
  margin: 0 0 10px;
  color: var(--forest-gold);
  font-family: var(--forest-heading);
  font-size: clamp(42px, 5.5vw, 68px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.01em;
  text-transform: none;
  text-shadow: 0 3px 18px rgba(0, 0, 0, 0.5);
}
.page-books .banner .page-lead {
  margin: 0;
  color: rgba(255, 249, 233, 0.91);
  font-family: var(--forest-heading);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.35;
}

.page-books .page-main {
  min-height: 34vh;
  padding: 48px 0 64px;
  background: linear-gradient(90deg, rgba(247, 240, 223, 0.83), rgba(247, 240, 223, 0.58) 20%, rgba(247, 240, 223, 0.58) 80%, rgba(247, 240, 223, 0.83));
}
.page-books .content-with-sides {
  width: min(100%, 1360px);
  margin: 0 auto;
  align-items: start;
}
.page-books .page-content {
  max-width: 890px;
  padding: 30px;
  border: 1px solid var(--books-border);
  border-radius: 20px;
  background: rgba(255, 249, 237, 0.94);
  box-shadow: 0 10px 26px rgba(66, 53, 26, 0.1);
}
.page-books .page-content .page-title {
  color: var(--books-ink);
  font-family: var(--forest-heading);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 700;
  line-height: 1.15;
  text-transform: none;
}
.page-books .page-content p,
.page-books .why-text p { color: #243a2e; }

/* Third-level menu: compact paper buttons rather than catalog cards. */
.page-books .side-links { gap: 12px; }
.page-books .side-link {
  position: relative;
  min-height: 52px;
  padding: 12px 34px 12px 14px;
  border: 1px solid var(--books-border);
  border-radius: 12px;
  background: linear-gradient(180deg, #fffdf6, #f3ead5);
  color: #204132;
  font-family: var(--forest-heading);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.22;
  text-align: left;
  text-decoration: none;
  box-shadow: var(--forest-shadow-raised), 0 6px 14px rgba(51, 45, 24, 0.12);
  transition: transform 160ms ease, box-shadow 150ms ease, border-color 160ms ease, background 160ms ease;
}
.page-books .side-link::after {
  content: '›';
  position: absolute;
  top: 50%;
  right: 13px;
  color: #a77412;
  font-family: Arial, sans-serif;
  font-size: 27px;
  font-weight: 400;
  line-height: 1;
  transform: translateY(-52%);
}
.page-books .side-link:hover,
.page-books .side-link:focus-visible {
  border-color: #c4942f;
  background: #fffdf6;
  color: #153c2a;
  transform: translateY(-2px);
  box-shadow: var(--forest-shadow-raised), 0 11px 20px rgba(51, 45, 24, 0.18);
}
.page-books .side-link:active {
  transform: translateY(2px);
  box-shadow: var(--forest-shadow-pressed), 0 2px 7px rgba(51, 45, 24, 0.11);
}
.page-books .side-link.active {
  border-color: #bc8520;
  background: linear-gradient(180deg, #f2d88c, #d5a53d);
  color: #173222;
  box-shadow: var(--forest-shadow-raised), 0 7px 14px rgba(90, 62, 14, 0.18);
}

.page-books .books-grid {
  display: flex;
  flex-direction: column;
  gap: 26px;
  margin: 0;
}
.page-books .books-row,
.page-books .books-row-1 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
  align-items: start;
}
.page-books .book-flip-card {
  min-height: 200px;
  overflow: visible;
  perspective: 1000px;
}
.page-books .book-flip-inner {
  min-height: 200px;
  transition: transform 0.6s ease;
}
.page-books .book-flip-front,
.page-books .book-flip-back {
  border: 1px solid rgba(232, 207, 115, 0.72);
  border-radius: 14px;
}
.page-books .book-flip-front {
  overflow: visible;
  background: #0b2c1c;
  box-shadow: var(--books-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.page-books .book-cover-link {
  border-radius: 13px;
  outline-offset: 5px;
}
.page-books .book-cover-slot {
  min-height: 200px;
  border-radius: 13px;
  background: linear-gradient(135deg, #0a301f, #164c31);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.page-books .book-cover-slot img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}
.page-books .book-flip-card .book-flip-front:hover {
  transform: scale(1.05);
  box-shadow: var(--books-shadow-hover);
}
.page-books .book-cover-slot:hover { transform: none; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12); }
.page-books .book-cover-slot-empty,
.page-books .book-flip-back-soon { background: linear-gradient(135deg, #f7efd9, #e5d8ba) !important; }
.page-books .book-cover-slot-soon { border: 1px dashed rgba(133, 98, 28, 0.55); }
.page-books .book-cover-soon-text,
.page-books .book-flip-back-soon .book-flip-text { color: #745516 !important; font-family: var(--forest-heading); text-transform: none; }

.page-books .book-flip-back {
  padding: 18px;
  background-position: center;
  background-size: cover;
  box-shadow: var(--books-shadow);
  overflow: hidden;
}
.page-books .book-flip-back::before { background: linear-gradient(160deg, rgba(3, 25, 15, 0.88), rgba(8, 48, 30, 0.82)); }
.page-books .book-flip-text {
  color: #fff9e9 !important;
  font-family: 'PT Sans', Arial, sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.42;
  text-align: left;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.38);
}

/* books.html has one additional long Russian label in the header. Keep the
   approved chrome compact without changing its component geometry. */
@media (min-width: 1181px) {
  .page-books .site-header .header-main {
    width: calc(100% - 44px);
    max-width: 1600px;
  }
  .page-books .site-header .site-title { max-width: 290px; white-space: nowrap; }
}

/* The original paired hover contract and its exact flip duration are retained. */
.page-books .books-row > .book-flip-card:first-child:hover + .book-flip-card .book-flip-inner { transform: rotateY(180deg); }
.page-books .books-row:has(> .book-flip-card:nth-child(2):hover) > .book-flip-card:first-child .book-flip-inner { transform: rotateY(180deg); }

.page-books .books-page-buttons { margin-top: 30px; }
.page-books .books-page-buttons .btn {
  padding: 10px 18px;
  border: 1px solid rgba(232, 207, 115, 0.72);
  border-radius: var(--forest-radius-control);
  background: linear-gradient(180deg, #f0dc8f, #c89c3d);
  color: #173023;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  box-shadow: var(--forest-shadow-raised), 0 7px 18px rgba(0, 0, 0, 0.17);
  transition: transform var(--forest-motion-control), box-shadow 150ms ease, filter 160ms ease;
}
.page-books .books-page-buttons .btn:hover,
.page-books .books-page-buttons .btn:focus-visible { transform: translateY(-1px); filter: brightness(1.06); box-shadow: var(--forest-shadow-raised), 0 9px 17px rgba(0, 0, 0, 0.25); }
.page-books .books-page-buttons .btn:active { transform: translateY(2px); box-shadow: var(--forest-shadow-pressed), 0 2px 7px rgba(0, 0, 0, 0.16); }

@media (max-width: 1080px) {
  .page-books .page-content { max-width: 760px; }
}
@media (max-width: 768px) {
  .page-books .banner { min-height: 350px; padding: 160px 18px 42px; }
  .page-books .page-main { padding: 32px 0 48px; }
  .page-books .page-content { padding: 22px 16px; border-radius: 16px; }
  .page-books .side-links { flex-direction: row; flex-wrap: wrap; width: 100%; }
  .page-books .side-link { flex: 1 1 190px; }
}
@media (max-width: 600px) {
  .page-books .banner { min-height: 310px; padding-top: 154px; }
  .page-books .banner .page-title { font-size: clamp(38px, 12vw, 52px); }
  .page-books .books-row,
  .page-books .books-row-1 { grid-template-columns: 1fr; gap: 20px; }
  .page-books .book-flip-card { width: min(100%, 390px); margin: 0 auto; }
  .page-books .book-flip-back { padding: 12px; }
  .page-books .book-flip-text { font-size: 14px; line-height: 1.4; }
  /* Long press adds .is-touch-flipped; no visible control is introduced. */
  .page-books .book-flip-card.is-touch-flipped .book-flip-inner { transform: rotateY(180deg); }
  .page-books .books-row > .book-flip-card:first-child:hover + .book-flip-card .book-flip-inner,
  .page-books .books-row:has(> .book-flip-card:nth-child(2):hover) > .book-flip-card:first-child .book-flip-inner { transform: none; }
  .page-books .books-row > .book-flip-card:first-child.is-touch-flipped .book-flip-inner,
  .page-books .books-row > .book-flip-card.is-touch-flipped .book-flip-inner { transform: rotateY(180deg); }
}