.library-page {
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% 18%, rgb(87 49 23 / 18%), transparent 28rem),
    linear-gradient(180deg, #080706, #020303 78%);
}

.library-page [hidden] {
  display: none !important;
}

.library-shell {
  position: relative;
  isolation: isolate;
  display: grid;
  width: min(100%, 860px);
  min-height: 100svh;
  min-height: 100dvh;
  grid-template-rows: auto minmax(0, 1fr);
  margin: 0 auto;
  padding:
    calc(16px + env(safe-area-inset-top))
    calc(10px + env(safe-area-inset-right))
    calc(16px + env(safe-area-inset-bottom))
    calc(10px + env(safe-area-inset-left));
  overflow: hidden;
  border-inline: 1px solid rgb(216 187 128 / 14%);
  background:
    linear-gradient(180deg, rgb(0 0 0 / 10%), rgb(0 0 0 / 70%)),
    repeating-linear-gradient(90deg, rgb(53 31 16 / 10%) 0 1px, transparent 1px 32px),
    linear-gradient(90deg, #070504, #120b07 50%, #070504);
  box-shadow: 0 0 52px #000;
}

.library-shell::before {
  content: "";
  position: absolute;
  inset: 7px;
  z-index: -1;
  border: 1px solid rgb(216 187 128 / 24%);
  pointer-events: none;
}

.library-header {
  position: relative;
  display: grid;
  justify-items: center;
  min-height: clamp(118px, 19svh, 190px);
  align-content: start;
  text-align: center;
}

.back-link {
  position: absolute;
  top: 7px;
  left: 8px;
  color: var(--gold-bright);
  font-size: 12px;
  letter-spacing: .1em;
  text-decoration: none;
  display: inline-flex;
  min-width: 52px;
  min-height: 44px;
  align-items: center;
}

.back-link span {
  font: 27px/0 Georgia, serif;
  vertical-align: -2px;
}

.asset-slot--library-crest {
  width: clamp(36px, 9vw, 56px);
  aspect-ratio: 1;
  border: 0;
  background: transparent;
  filter: drop-shadow(0 4px 9px rgb(0 0 0 / 58%));
}

.library-kicker {
  margin: 6px 0 0;
  color: var(--muted);
  font: 10px/1 Georgia, serif;
  letter-spacing: .18em;
}

.library-header h1 {
  margin: 5px 0 0;
  color: var(--paper);
  font: 500 clamp(29px, 8vw, 54px)/1 Georgia, "Times New Roman", serif;
  letter-spacing: .06em;
  text-shadow: 0 3px 14px #000;
}

.library-header h1::after {
  content: "";
  display: block;
  width: min(48vw, 220px);
  height: 1px;
  margin: 9px auto 0;
  background: linear-gradient(90deg, transparent, var(--gold-dim), transparent);
}

.library-description {
  margin: 9px 0 0;
  color: var(--gold);
  font-size: clamp(9px, 2.5vw, 13px);
  letter-spacing: .07em;
}

.book-selector {
  position: relative;
  display: grid;
  min-height: 0;
  grid-template-rows: minmax(260px, 1fr) auto auto auto;
  align-content: stretch;
}

.book-stage {
  --book-width: clamp(158px, 49vw, 245px);
  --book-shift: clamp(155px, 52vw, 330px);
  position: relative;
  min-height: clamp(300px, 52svh, 500px);
  overflow: visible;
  touch-action: pan-y;
  user-select: none;
  -webkit-user-select: none;
  perspective: 1100px;
}

.book-stage::after {
  content: "";
  position: absolute;
  right: 3%;
  bottom: 3%;
  left: 3%;
  height: 12px;
  border-block: 1px solid rgb(216 187 128 / 26%);
  background: #160e09 url("../assets/official/ui/shelf-board.webp") center / 100% 100% no-repeat;
  box-shadow: 0 9px 20px #000, inset 0 1px rgb(216 187 128 / 8%);
}

.book-track {
  position: absolute;
  inset: 0;
}

.book-slide {
  --cover-accent: #671322;
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  display: grid;
  width: var(--book-width);
  aspect-ratio: 4 / 7;
  max-height: calc(100% - 18px);
  place-items: center;
  overflow: hidden;
  padding: 30px 22px;
  border: 1px solid rgb(216 187 128 / 62%);
  border-radius: 3px 9px 9px 3px;
  background-image:
    linear-gradient(rgb(4 4 5 / 12%), rgb(4 4 5 / 12%)),
    var(--cover-image, linear-gradient(transparent, transparent)),
    linear-gradient(90deg, #18070b 0 7%, var(--cover-accent) 7% 9%, transparent 9%),
    repeating-linear-gradient(135deg, transparent 0 8px, rgb(216 187 128 / 2%) 8px 9px),
    radial-gradient(circle at 50% 38%, rgb(142 83 38 / 18%), transparent 42%),
    linear-gradient(145deg, #2a0a11, #090708 78%);
  background-position: center, center, center, center, center, center;
  background-size: cover, 100% 100%, auto, auto, auto, auto;
  background-repeat: no-repeat;
  color: var(--paper);
  box-shadow:
    inset -9px 0 0 rgb(255 238 208 / 6%),
    inset -11px 0 12px rgb(0 0 0 / 24%),
    inset 0 0 0 7px rgb(0 0 0 / 25%),
    0 24px 32px rgb(0 0 0 / 68%);
  opacity: 0;
  transform: translate3d(-50%, -50%, 0) scale(.5);
  transform-style: preserve-3d;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: transform .36s ease, opacity .28s ease;
  will-change: transform, opacity;
  pointer-events: none;
}

.book-slide__new-marker {
  position: absolute;
  z-index: 12;
  top: 8px;
  right: 8px;
  min-width: 39px;
  padding: 5px 6px 7px;
  border: 1px solid rgb(216 187 128 / 68%);
  background: linear-gradient(180deg, #781827, #3c080f);
  color: var(--gold-bright);
  box-shadow: 0 4px 8px rgb(0 0 0 / 52%);
  font: 9px/1 Georgia, serif;
  letter-spacing: .1em;
  text-align: center;
  clip-path: polygon(0 0, 100% 0, 100% 82%, 50% 100%, 0 82%);
  pointer-events: none;
  transition: opacity .14s ease;
}

.book-slide__inner-page,
.book-slide__cover-leaf,
.book-slide__cover-front,
.book-slide__cover-back {
  position: absolute;
  inset: 0;
  display: block;
  border-radius: inherit;
  pointer-events: none;
}

.book-slide__inner-page,
.book-slide__cover-leaf {
  visibility: hidden;
  opacity: 0;
}

.book-slide__inner-page {
  z-index: 7;
  overflow: hidden;
  border: 1px solid rgb(125 93 52 / 55%);
  background:
    linear-gradient(90deg, rgb(55 31 14 / 38%), transparent 10%, transparent 90%, rgb(91 59 24 / 22%)),
    repeating-linear-gradient(102deg, rgb(96 65 31 / 3%) 0 1px, transparent 1px 7px),
    radial-gradient(circle at 52% 42%, rgb(255 241 201 / 24%), transparent 42%),
    linear-gradient(145deg, #d8c391, #bfa16c 86%);
  box-shadow:
    inset 12px 0 18px rgb(54 31 15 / 30%),
    inset 0 0 20px rgb(91 59 24 / 14%);
  transform: translate3d(0, 0, 0);
}

.book-slide__inner-page::before {
  content: "";
  position: absolute;
  z-index: 1;
  top: 8%;
  bottom: 8%;
  left: 10%;
  width: 1px;
  background: linear-gradient(transparent, rgb(115 79 40 / 36%) 18% 82%, transparent);
  box-shadow: 4px 0 9px rgb(73 42 18 / 16%);
}

.book-slide__inner-page::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background: url("../assets/official/yoru-familia-crest.png") center / 64% auto no-repeat;
  opacity: .28;
  filter: grayscale(1) sepia(1) saturate(.55) contrast(.9) brightness(.62);
}

.book-slide__page-light {
  position: absolute;
  inset: -30%;
  z-index: 0;
  border-radius: 50%;
  background:
    radial-gradient(
      circle at 56% 50%,
      rgb(255 249 220 / 98%) 0,
      rgb(255 236 180 / 92%) 18%,
      rgb(239 190 105 / 48%) 42%,
      transparent 68%
    ),
    radial-gradient(
      circle at 56% 50%,
      rgb(255 225 160 / 55%) 0,
      rgb(224 164 77 / 32%) 48%,
      transparent 82%
    );
  opacity: 0;
  transform: translate3d(5%, 0, 0) scale(.68);
  transition:
    opacity .34s cubic-bezier(.22, .61, .36, 1),
    transform .34s cubic-bezier(.22, .61, .36, 1);
  pointer-events: none;
}

.book-slide__cover-leaf {
  z-index: 9;
  transform: translate3d(0, 0, 1px) rotateY(0deg);
  transform-origin: left center;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
}

.book-slide__cover-front,
.book-slide__cover-back {
  overflow: hidden;
  border: 1px solid rgb(216 187 128 / 62%);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.book-slide__cover-front {
  z-index: 2;
  place-items: center;
  background-image:
    linear-gradient(rgb(4 4 5 / 12%), rgb(4 4 5 / 12%)),
    var(--cover-image, linear-gradient(transparent, transparent)),
    linear-gradient(90deg, #18070b 0 7%, var(--cover-accent) 7% 9%, transparent 9%),
    repeating-linear-gradient(135deg, transparent 0 8px, rgb(216 187 128 / 2%) 8px 9px),
    radial-gradient(circle at 50% 38%, rgb(142 83 38 / 18%), transparent 42%),
    linear-gradient(145deg, #2a0a11, #090708 78%);
  background-position: center;
  background-size: cover, 100% 100%, auto, auto, auto, auto;
  background-repeat: no-repeat;
  box-shadow:
    inset -9px 0 0 rgb(255 238 208 / 6%),
    inset -11px 0 12px rgb(0 0 0 / 24%),
    inset 0 0 0 7px rgb(0 0 0 / 25%);
}

.book-slide__cover-front > .book-slide__content {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: center;
  margin: auto;
  padding: 30px 22px;
}

.book-slide__cover-back {
  z-index: 1;
  background:
    linear-gradient(90deg, rgb(218 184 119 / 9%), transparent 12%),
    repeating-linear-gradient(135deg, transparent 0 8px, rgb(216 187 128 / 3%) 8px 9px),
    linear-gradient(145deg, #241610, #0b0807 82%);
  box-shadow: inset 0 0 0 7px rgb(216 187 128 / 7%), inset 0 0 24px #000;
  transform: rotateY(180deg);
}

.book-slide.is-opening-prep {
  overflow: visible;
  perspective: 1100px;
  transform: translate3d(-50%, calc(-50% - 4px), 0) scale(1.055);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform .18s cubic-bezier(.22, .7, .28, 1);
}

.book-slide.is-opening-prep > .book-slide__content,
.book-slide.is-opening-prep > .book-slide__official-title-logo,
.book-slide.is-opening-prep > .book-slide__new-marker,
.book-slide.is-opening-prep::before,
.book-slide.is-opening-prep::after {
  opacity: 0;
}

@media (min-width: 768px) and (max-width: 1180px) and (min-height: 600px) {
  .book-slide__new-marker {
    top: 10px;
    right: 10px;
    min-width: 46px;
    padding: 6px 8px 8px;
    font-size: 11px;
  }
}

.book-slide.is-opening-prep .book-slide__inner-page,
.book-slide.is-opening-prep .book-slide__cover-leaf {
  visibility: visible;
  opacity: 1;
}

.book-slide.is-opening-prep .book-slide__cover-leaf {
  will-change: transform;
  transition: transform .7s cubic-bezier(.45, .05, .4, .95) .12s;
}

.book-slide.is-opening .book-slide__cover-leaf {
  transform: translate3d(0, 0, 1px) rotateY(-145deg);
}

.book-slide.is-opening {
  transform-origin: 70% 50%;
  will-change: transform, opacity;
}

.book-slide.is-opening.is-zooming {
  transform: translate3d(calc(-50% + 15%), calc(-50% - 2%), 0) scale(1.9);
  transition:
    transform .48s cubic-bezier(.22, .61, .36, 1),
    opacity .2s ease;
}

.book-slide.is-opening.is-lighting .book-slide__page-light {
  opacity: .88;
  transform: translate3d(5%, 0, 0) scale(2.1);
}

.book-opening-destination {
  position: fixed;
  inset: 0;
  z-index: 1000;
  overflow: hidden;
  background:
    radial-gradient(circle at 54% 48%, rgb(236 197 124 / 16%), transparent 44%),
    #080706;
  opacity: 0;
  transform: translate3d(0, 0, 0);
  pointer-events: none;
}

.book-opening-destination__frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #080706;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.book-opening-whiteout {
  position: fixed;
  inset: 0;
  z-index: 1001;
  background: #fff;
  opacity: 0;
  transform: translate3d(0, 0, 0);
  transition: opacity .18s cubic-bezier(.22, .61, .36, 1);
  pointer-events: none;
  will-change: opacity;
}

:root.is-book-whiteout .book-opening-whiteout {
  opacity: 1;
}

.is-book-opening .book-slide:not(.is-opening-prep),
.is-book-opening .carousel-arrow,
.is-book-opening .book-dots,
.is-book-opening .gesture-help,
.is-book-opening .open-area {
  opacity: .35;
  transition: opacity .16s ease;
}

.book-slide.is-opening-reduced {
  transform: translate3d(-50%, calc(-50% - 2px), 0) scale(1.02);
  transition: transform .16s ease, opacity .16s ease;
}

.is-book-opening-reduced .library-shell {
  opacity: .78;
  transition: opacity .18s ease;
}

.book-slide::before {
  content: "";
  position: absolute;
  inset: 13px 12px 13px 25px;
  border: 1px solid rgb(216 187 128 / 48%);
  box-shadow: inset 0 0 0 4px rgb(0 0 0 / 14%), inset 0 0 20px rgb(216 187 128 / 3%);
  pointer-events: none;
}

.book-slide::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 17px;
  left: 13px;
  color: rgb(216 187 128 / 35%);
  font: 7px/1 Georgia, serif;
  letter-spacing: .2em;
  text-align: center;
}

.book-slide.is-active {
  z-index: 4;
  opacity: 1;
  transform: translate3d(-50%, -50%, 0) scale(1);
  pointer-events: auto;
  cursor: pointer;
}

.book-slide.is-previous {
  z-index: 2;
  opacity: .56;
  transform: translate3d(calc(-50% - var(--book-shift)), -50%, 0) scale(.76) perspective(700px) rotateY(7deg);
  pointer-events: auto;
  cursor: pointer;
}

.book-slide.is-next {
  z-index: 2;
  opacity: .56;
  transform: translate3d(calc(-50% + var(--book-shift)), -50%, 0) scale(.76) perspective(700px) rotateY(-7deg);
  pointer-events: auto;
  cursor: pointer;
}

.book-slide__content {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  gap: 12px;
  width: 100%;
  text-align: center;
  text-shadow: 0 2px 8px #000;
}

.book-slide.has-cover-image .book-slide__content {
  align-content: space-between;
  min-height: 78%;
  padding-block: 2px;
}

.book-slide__content::before {
  content: "◆";
  color: rgb(216 187 128 / 58%);
  font: 10px/1 Georgia, serif;
}

.book-slide__label {
  margin: 0;
  color: var(--gold);
  font: clamp(12px, 3.5vw, 18px)/1.25 Georgia, "Yu Mincho", serif;
  letter-spacing: .08em;
}

.book-slide__title {
  max-width: calc(100% + 14px);
  margin: 0;
  overflow-wrap: normal;
  word-break: keep-all;
  white-space: nowrap;
  color: var(--paper);
  font: 500 clamp(20px, 6.2vw, 34px)/1.35 "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: .04em;
}

.book-slide__title.is-long {
  font-size: clamp(16px, 4.7vw, 27px);
  letter-spacing: 0;
}

.book-slide.requires-title-fit .book-slide__title {
  justify-self: center;
  overflow: visible;
  text-align: center;
}

.book-slide__title.is-multiline {
  display: grid;
  gap: 4px;
  white-space: normal;
  font: 500 clamp(12px, 3.5vw, 19px)/1.35 Georgia, "Times New Roman", serif;
  letter-spacing: .015em;
}

.book-slide__title.is-multiline span {
  white-space: nowrap;
  word-break: normal;
  overflow-wrap: normal;
}

.book-slide__count {
  margin: 7px 0 0;
  color: var(--muted);
  font: 9px/1.4 "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  letter-spacing: .1em;
}

.carousel-arrow {
  position: absolute;
  z-index: 6;
  top: 50%;
  width: 42px;
  height: 64px;
  padding: 0;
  background: transparent;
  color: var(--gold-bright);
  font: 50px/1 Georgia, serif;
  text-shadow: 0 0 10px #000, 0 0 8px rgb(216 187 128 / 38%);
  transform: translateY(-50%);
  cursor: pointer;
  transition: color .16s ease, text-shadow .16s ease, transform .16s ease;
}

.carousel-arrow:hover,
.carousel-arrow:focus-visible {
  color: #f8e7bb;
  text-shadow: 0 0 12px #000, 0 0 12px rgb(216 187 128 / 58%);
}

.carousel-arrow--previous {
  left: 0;
}

.carousel-arrow--next {
  right: 0;
}

.book-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  min-height: 16px;
  margin-top: 2px;
}

.book-dot {
  width: 7px;
  height: 7px;
  padding: 0;
  border: 1px solid var(--gold-dim);
  background: transparent;
  transform: rotate(45deg);
  cursor: pointer;
}

.book-dot.is-active {
  background: var(--gold-bright);
  box-shadow: 0 0 7px rgb(216 187 128 / 50%);
}

.gesture-help {
  margin: 3px 0 8px;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: .08em;
  text-align: center;
}

.open-area {
  display: grid;
  justify-items: center;
  gap: 5px;
  padding-bottom: 1px;
}

.open-book {
  display: grid;
  width: min(72vw, 330px);
  min-height: 48px;
  place-items: center;
  border: 1px solid rgb(216 187 128 / 62%);
  background: linear-gradient(180deg, #1c120d, #050505);
  color: var(--gold-bright);
  font-size: 17px;
  letter-spacing: .24em;
  text-decoration: none;
  box-shadow: inset 0 0 0 5px rgb(216 187 128 / 6%);
  cursor: pointer;
  transition: border-color .16s ease, color .16s ease, box-shadow .16s ease;
}

.open-book:hover,
.open-book:focus-visible {
  border-color: var(--gold);
  color: #f8e7bb;
  box-shadow: inset 0 0 0 5px rgb(216 187 128 / 9%), 0 9px 18px rgb(0 0 0 / 38%);
}

.open-book:disabled {
  opacity: .68;
}

.open-note {
  min-height: 12px;
  margin: 0;
  color: var(--muted);
  font-size: 8px;
  letter-spacing: .06em;
  text-align: center;
}

.empty-library {
  align-self: center;
  display: grid;
  justify-items: center;
  gap: 24px;
  width: min(100% - 24px, 600px);
  margin: auto;
}

.empty-library__frame {
  width: 100%;
  padding: clamp(44px, 10vw, 80px) 24px;
  border: 1px solid rgb(216 187 128 / 42%);
  background: linear-gradient(145deg, rgb(25 17 10 / 74%), rgb(3 4 4 / 92%));
  box-shadow: inset 0 0 0 7px rgb(0 0 0 / 35%), inset 0 0 38px rgb(216 187 128 / 4%), 0 24px 38px #000;
  text-align: center;
}

.empty-library__label {
  margin: 0 0 17px;
  color: var(--gold);
  font: 12px/1 Georgia, serif;
  letter-spacing: .2em;
}

.empty-library h2 {
  margin: 0;
  color: var(--paper);
  font-size: clamp(19px, 5vw, 29px);
  font-weight: 500;
  line-height: 1.55;
}

.empty-library__frame p:last-child {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.8;
}

.empty-library__back {
  color: var(--gold-bright);
  font-size: 12px;
  letter-spacing: .14em;
  text-underline-offset: 5px;
}

.library-error {
  align-self: center;
  margin: 0 auto;
  color: #e6b2aa;
  font-size: 12px;
  text-align: center;
}

@media (max-height: 650px) {
  .library-header {
    min-height: 106px;
  }

  .asset-slot--library-crest {
    width: 30px;
  }

  .library-header h1 {
    font-size: 27px;
  }

  .book-selector {
    grid-template-rows: minmax(250px, 1fr) auto auto auto;
  }

  .book-stage {
    --book-width: clamp(146px, 43vw, 190px);
    min-height: 274px;
  }

  .book-slide {
    padding-block: 22px;
  }

  .open-book {
    min-height: 42px;
  }
}

@media (max-width: 350px) {
  .library-shell {
    padding-inline: 7px;
  }

  .book-stage {
    --book-width: 156px;
    --book-shift: 146px;
  }

  .book-slide__title {
    font-size: 19px;
  }

  .book-slide__title.is-long {
    font-size: 15px;
  }

  .book-slide__title.is-multiline {
    font-size: 11px;
  }

  .carousel-arrow {
    width: 34px;
    font-size: 42px;
  }

  .library-description {
    letter-spacing: .035em;
  }
}

@media (min-width: 700px) {
  .book-stage {
    --book-width: clamp(218px, 28vw, 250px);
    --book-shift: clamp(275px, 37vw, 350px);
  }
}

/* SUB keeps its own broader 4:5 binding while MAIN remains 3:4. */
:root[data-library-type="sub"] .book-stage {
  --book-width: clamp(186px, 58vw, 260px);
}

:root[data-library-type="sub"] .book-slide {
  top: calc(50% + 24px);
  aspect-ratio: 4 / 5;
  background-size: cover, cover, auto, auto, auto, auto;
  background-position: center;
}

:root[data-library-type="sub"] .book-slide__cover-front {
  background-size: cover, cover, auto, auto, auto, auto;
  background-position: center;
}

:root[data-library-type="sub"] .book-slide__official-title-logo {
  position: absolute;
  z-index: 2;
  top: 7.5%;
  left: 50%;
  width: 72%;
  height: auto;
  object-fit: contain;
  opacity: .88;
  transform: translate3d(-50%, 0, 0);
  pointer-events: none;
}

:root[data-library-type="sub"] .book-slide__content,
:root[data-library-type="sub"] .book-slide__cover-front > .book-slide__content {
  z-index: 3;
  align-content: start;
  min-height: 0;
  height: 100%;
  padding: 29% 13% 9%;
  gap: 5px;
}

:root[data-library-type="sub"] .book-slide__content::before {
  content: none;
}

:root[data-library-type="sub"] .book-slide__label {
  color: rgb(216 187 128 / 74%);
  font-size: clamp(9px, 2.7vw, 13px);
  letter-spacing: .13em;
}

:root[data-library-type="sub"] .book-slide__title {
  max-width: 100%;
  margin-top: 2px;
  color: #f1db9b;
  font-size: clamp(27px, 8.1vw, 40px);
  line-height: 1.18;
  letter-spacing: .06em;
  text-shadow: 0 2px 6px #000, 0 0 16px rgb(65 31 12 / 54%);
}

:root[data-library-type="sub"] .book-slide__count {
  margin-top: auto;
  color: rgb(236 216 169 / 76%);
  font-size: clamp(8px, 2.3vw, 11px);
}

/* Keep the normal SUB title in its established coordinates while the cover leaf starts rotating. */
:root[data-library-type="sub"] .book-slide.is-opening-prep {
  transform: translate3d(-50%, -50%, 0) scale(1.055);
}

:root[data-library-type="sub"] .book-slide.is-opening-prep > .book-slide__content {
  z-index: 10;
  opacity: 1;
  transform: translate3d(0, 0, 2px);
  transition: opacity .16s ease;
}

:root[data-library-type="sub"] .book-slide.is-opening > .book-slide__content {
  opacity: 0;
}

:root[data-library-type="sub"] .book-slide.is-opening-prep .book-slide__cover-front > .book-slide__content {
  opacity: 0;
}

/* MAIN covers contain the official logo and chapter text in the artwork. */
:root[data-library-type="main"] .book-stage {
  --book-width: clamp(216px, 66vw, 270px);
  --book-shift: clamp(174px, 54vw, 300px);
  min-height: clamp(286px, 46svh, 390px);
}

:root[data-library-type="main"] .book-slide {
  aspect-ratio: 3 / 4;
  max-height: calc(100% - 16px);
  -webkit-appearance: none;
  -webkit-backface-visibility: hidden;
  appearance: none;
  backface-visibility: hidden;
  padding: 0;
  border: 0;
  border-radius: 3px 7px 7px 3px;
  background-color: transparent;
  background-image: var(--cover-image);
  background-position: center;
  background-size: 100% 100%;
  box-shadow: 0 24px 34px rgb(0 0 0 / 72%);
  filter: none;
  transform: translate3d(-50%, -50%, 0) scale(.5);
  transform-style: preserve-3d;
  transition: transform .36s ease, opacity .28s ease;
  will-change: transform, opacity;
}

:root[data-library-type="main"] .book-slide::before,
:root[data-library-type="main"] .book-slide::after {
  content: none;
}

:root[data-library-type="main"] .book-slide__cover-front {
  border: 0;
  background-color: transparent;
  background-image: var(--cover-image);
  background-position: center;
  background-size: 100% 100%;
  box-shadow: none;
}

:root[data-library-type="main"] .book-slide.is-previous {
  transform: translate3d(calc(-50% - var(--book-shift)), -50%, 0) scale(.72);
}

:root[data-library-type="main"] .book-slide.is-next {
  transform: translate3d(calc(-50% + var(--book-shift)), -50%, 0) scale(.72);
}

:root[data-library-type="main"] .book-slide.is-active {
  transform: translate3d(-50%, -50%, 0) scale(1);
}

:root[data-library-type="main"] .book-slide.is-active.is-opening-prep {
  transform: translate3d(-50%, calc(-50% - 4px), 0) scale(1.055);
}

:root[data-library-type="main"] .book-slide.is-active.is-opening-prep.is-zooming {
  transform: translate3d(calc(-50% + 15%), calc(-50% - 2%), 0) scale(1.9);
}

:root[data-library-type="main"] .book-slide.is-active.is-opening-reduced {
  transform: translate3d(-50%, calc(-50% - 2px), 0) scale(1.02);
}

@media (prefers-reduced-motion: reduce) {
  .book-slide__inner-page,
  .book-slide__cover-leaf {
    display: none;
  }

  .book-opening-whiteout {
    transition-duration: .12s;
  }

}

@media (max-height: 650px) {
  :root[data-library-type="main"] .book-stage {
    --book-width: clamp(198px, 58vw, 230px);
    min-height: 270px;
  }
}

@media (min-width: 768px) and (max-width: 1180px) and (min-height: 600px) {
  .library-shell {
    width: 92vw;
    max-width: none;
    padding-inline: 18px;
  }

  :root[data-library-type="main"] .book-stage {
    --book-width: clamp(270px, 34vw, 320px);
    --book-shift: clamp(268px, 37vw, 380px);
  }

  :root[data-library-type="sub"] .book-stage {
    --book-width: clamp(275px, 35vw, 330px);
    --book-shift: clamp(270px, 38vw, 390px);
  }
}

@media (min-width: 768px) and (max-width: 1180px) and (min-height: 600px) and (orientation: landscape) {
  .library-shell {
    width: 95vw;
  }
}