@font-face {
  font-family: "Inter";
  src: url("../assets/fonts/InterVariable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  color: #26251f;
  background: #f4f4f4;
  --brand: #ffffa9;
  --brand-ink: #000000;
  --radius-control: 8px;
  --header-center-gap: clamp(28px, 6vw, 48px);
  --font-sans: "Inter", "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, system-ui, sans-serif;
  font-family: var(--font-sans);
  font-synthesis: none;
  --page-width: 471;
  --page-height: 640;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: #f4f4f4;
}

.wechat-share-tip {
  position: fixed;
  inset: 0;
  z-index: 20000;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgb(24 21 17 / 82%);
  color: #fff;
  cursor: pointer;
}

.wechat-share-tip[hidden] {
  display: none;
}

.wechat-share-tip-card {
  position: relative;
  display: grid;
  gap: 10px;
  max-width: min(420px, 90vw);
  padding: 28px 30px;
  border: 1px solid rgb(255 255 255 / 20%);
  border-radius: 8px;
  background: #1d1a16;
  text-align: center;
  box-shadow: 0 28px 70px rgb(0 0 0 / 28%);
}

.wechat-share-tip-card::before {
  position: absolute;
  top: -13px;
  right: 34px;
  width: 0;
  height: 0;
  border-right: 13px solid transparent;
  border-bottom: 13px solid #1d1a16;
  border-left: 13px solid transparent;
  content: "";
}

.wechat-share-tip-card strong {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
}

.wechat-share-tip-card p {
  margin: 0;
  color: rgb(255 255 255 / 76%);
  font-size: 14px;
  line-height: 1.6;
}

button {
  color: inherit;
  font: inherit;
}

.room {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 100dvh;
  padding: 22px clamp(16px, 3vw, 44px) 18px;
}

.book-header,
.controls {
  display: grid;
  align-items: center;
  gap: 20px;
  width: min(100%, 1180px);
  margin: 0 auto;
}

.book-header {
  grid-template-columns: 1fr var(--header-center-gap) 1fr;
  gap: 0;
}

.controls {
  grid-template-columns: 42px 1fr 42px;
}

.book-header span {
  color: #5c574d;
  font: 600 10px/1.2 var(--font-sans);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.book-header span:last-child {
  text-align: right;
}

.toc-trigger {
  display: inline-flex;
  align-items: center;
  grid-column: 1;
  justify-self: end;
  gap: 10px;
  min-height: 36px;
  padding: 6px 0;
  border: 0;
  border-radius: var(--radius-control);
  background: transparent;
  cursor: pointer;
}

.toc-trigger-icon {
  display: grid;
  gap: 4px;
  width: 20px;
}

.toc-trigger-icon i {
  display: block;
  width: 100%;
  height: 1px;
  background: currentColor;
}

.toc-trigger:hover .toc-trigger-icon i:nth-child(2) {
  width: 72%;
}

.toc-backdrop {
  position: fixed;
  inset: 0;
  z-index: 10000;
  border: 0;
  background: rgb(32 30 25 / 38%);
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  cursor: default;
  transition: opacity 220ms ease, visibility 220ms ease;
}

.toc-panel {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 10001;
  isolation: isolate;
  width: min(380px, 88vw);
  padding: 34px 28px 28px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: #f4f4f4;
  box-shadow: 24px 0 60px rgb(31 28 22 / 22%);
  transform: translateX(-104%);
  transition: transform 280ms cubic-bezier(.22, 1, .36, 1);
}

body.toc-is-open .toc-backdrop {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

body.toc-is-open .toc-panel {
  transform: translateX(0);
}

body.toc-is-open .book-header,
body.toc-is-open .stage,
body.toc-is-open .controls {
  pointer-events: none;
  user-select: none;
}

.toc-panel-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 20px;
  padding: 0 4px 24px;
  border-bottom: 1px solid rgb(38 37 31 / 16%);
}

.toc-eyebrow {
  display: block;
  margin-bottom: 8px;
  color: #777166;
  font: 600 9px/1.2 var(--font-sans);
  letter-spacing: .18em;
  text-transform: uppercase;
}

.toc-panel h2 {
  margin: 0;
  font-size: 30px;
  font-weight: 400;
}

.toc-close {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid rgb(38 37 31 / 18%);
  border-radius: var(--radius-control);
  background: transparent;
  font: 24px/1 var(--font-sans);
  cursor: pointer;
}

.toc-nav {
  display: grid;
  padding: 10px 0 24px;
}

.toc-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  width: 100%;
  padding: 14px 12px;
  border: 0;
  border-bottom: 1px solid rgb(38 37 31 / 10%);
  border-radius: var(--radius-control);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease, transform 160ms ease;
}

.toc-item:hover,
.toc-item:focus-visible {
  background: rgb(255 255 255 / 70%);
}

.toc-item:focus-visible {
  outline: 2px solid #26251f;
  outline-offset: 2px;
}

.toc-item.is-active {
  background: var(--brand);
  color: var(--brand-ink);
}

.toc-item.is-active .toc-number,
.toc-item.is-active .toc-copy small {
  color: var(--brand-ink);
}

.toc-item:disabled {
  cursor: default;
  opacity: .55;
}

.toc-number {
  padding-top: 2px;
  color: #777166;
  font: 600 10px/1.2 var(--font-sans);
  letter-spacing: .1em;
}

.toc-copy {
  display: grid;
  gap: 5px;
}

.toc-copy strong {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.25;
}

.toc-copy small {
  color: #777166;
  font: 9px/1.2 var(--font-sans);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  grid-column: 3;
  justify-self: start;
  justify-content: flex-start;
  gap: 18px;
}

.share-page {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid rgb(38 37 31 / 18%);
  border-radius: var(--radius-control);
  background: rgb(255 255 255 / 24%);
  color: #5c574d;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.share-page:hover {
  background: rgb(255 255 255 / 48%);
  color: #26251f;
}

.share-page:focus-visible {
  outline: 2px solid #26251f;
  outline-offset: 2px;
}

.share-page-icon {
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.share-page-label {
  color: inherit;
  font: 600 10px/1.2 var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.share-page.is-shared {
  background: var(--brand);
  color: var(--brand-ink);
}

.language-switch {
  display: inline-flex;
  align-items: stretch;
  gap: 0;
  height: 34px;
  min-height: 34px;
  padding: 0;
  border: 1px solid rgb(38 37 31 / 18%);
  border-radius: var(--radius-control);
  background: rgb(255 255 255 / 24%);
  overflow: hidden;
}

.language-switch button {
  height: 100%;
  min-height: 0;
  padding: 0 10px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: #777166;
  font: 600 10px/1.2 var(--font-sans);
  letter-spacing: 0.08em;
  cursor: pointer;
}

.language-switch button[aria-pressed="true"] {
  background: var(--brand);
  color: var(--brand-ink);
}

.stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 0;
  padding: 8px 0;
  perspective: 1800px;
}

.book-rig {
  position: relative;
  display: grid;
  place-items: center;
  width: min(100%, 1843px);
  height: min(80dvh, 806px);
}

.book-loader {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 20;
  display: grid;
  min-width: 180px;
  place-items: center;
  padding: 16px 22px;
  border: 1px solid rgb(38 37 31 / 18%);
  background: #f4f4f4;
  color: #5c574d;
  font: 600 12px var(--font-sans);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transform: translate(-50%, -50%);
  opacity: 1;
  visibility: visible;
  transition: opacity 240ms ease, visibility 240ms ease;
  pointer-events: none;
}

.book-loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.book {
  position: relative;
  isolation: isolate;
  --book-thickness: clamp(10px, 2.4vw, 36px);
  --book-left-progress: 0;
  --book-right-progress: 1;
  filter: drop-shadow(0 24px 26px rgb(31 28 22 / 22%));
  transition: transform 620ms cubic-bezier(.22, 1, .36, 1);
}

.book::before,
.book::after {
  position: absolute;
  top: 2.4%;
  bottom: 2.4%;
  z-index: -1;
  width: calc(var(--book-thickness) * var(--edge-progress, 1));
  min-width: 0;
  background:
    repeating-linear-gradient(
      90deg,
      rgb(255 255 255 / 78%) 0 1px,
      rgb(38 37 31 / 14%) 1px 2px
    ),
    linear-gradient(90deg, rgb(255 255 255 / 62%), rgb(208 199 178 / 68%));
  box-shadow: 0 0 0 1px rgb(255 255 255 / 18%);
  content: "";
  pointer-events: none;
  transition: width 280ms ease;
}

.book::before {
  --edge-progress: var(--book-left-progress);
  right: calc(100% - 2px);
  transform: skewY(-1.2deg);
  transform-origin: right center;
}

.book::after {
  --edge-progress: var(--book-right-progress);
  left: calc(100% - 2px);
  transform: skewY(1.2deg);
  transform-origin: left center;
}

.stage.is-cover-centered .book {
  transform: translateX(-25%);
}

.book-page {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(90deg, transparent 96%, rgb(30 27 20 / 5%)),
    #f2eee4;
  color: #29271f;
}


.book-page.--left::before,
.book-page.--right::before {
  position: absolute;
  inset-block: 0;
  z-index: 3;
  width: clamp(14px, 4%, 28px);
  content: "";
  pointer-events: none;
}

.book-page.--left::before {
  right: 0;
  background: linear-gradient(to left, rgb(27 24 20 / 30%), rgb(27 24 20 / 8%) 42%, transparent);
}

.book-page.--right::before {
  left: 0;
  background: linear-gradient(to right, rgb(27 24 20 / 30%), rgb(27 24 20 / 8%) 42%, transparent);
}

.book-page::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
  content: "";
  mix-blend-mode: multiply;
}

.cover,
.back-cover {
  background: #243f39;
  color: #f0e9d8;
}

.cover {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 48px;
}

.cover-mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid rgb(240 233 216 / 65%);
  border-radius: 50%;
  font: 10px var(--font-sans);
  letter-spacing: 0.14em;
}

.kicker,
.folio,
.caption,
.page-number {
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.cover h2 {
  margin: 12px 0 0;
  font-size: 62px;
  font-weight: 400;
  line-height: 0.9;
}

.title-page,
.closing-page {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 64px;
}

.title-page h2,
.closing-page > p:first-child {
  font-size: 36px;
  font-weight: 400;
  line-height: 1.12;
}

.photo-layout img,
.photo-placeholder {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-placeholder--one {
  background: linear-gradient(152deg, #71908b 0 46%, #d7b16b 47% 53%, #314d49 54%);
}

.photo-placeholder--two {
  background: radial-gradient(circle at 72% 32%, #f1d4a0 0 12%, transparent 13%), linear-gradient(145deg, #7f6b56, #283b38);
}

.photo-placeholder--three {
  background: linear-gradient(25deg, #314944, #b5a07c);
}

.photo-placeholder--four {
  background: linear-gradient(160deg, #d8c9ad 0 45%, #6f493f 46%);
}

.photo-layout--full .photo-placeholder,
.photo-layout--full img {
  position: absolute;
  inset: 0;
}

.photo-layout--framed {
  padding: 48px 48px 82px;
}

.photo-layout--framed .caption {
  margin: 18px 0 0;
  line-height: 1.5;
  text-transform: none;
}

.photo-layout--split {
  display: grid;
  grid-template-rows: 1.2fr 0.8fr;
  gap: 14px;
  padding: 36px;
}

.inside-cover {
  background: #ded8ca;
}

.page-number {
  position: absolute;
  right: 26px;
  bottom: 22px;
  z-index: 2;
}

.page-number--light {
  color: white;
}

.controls {
  grid-template-columns: 42px 1fr 42px;
  max-width: 440px;
}

.controls button {
  width: 42px;
  height: 42px;
  border: 1px solid rgb(38 37 31 / 25%);
  border-radius: var(--radius-control);
  background: rgb(242 238 228 / 48%);
  cursor: pointer;
}

.controls button:disabled {
  cursor: default;
  opacity: 0.28;
}

.status {
  display: grid;
  gap: 4px;
  text-align: center;
}

.status span {
  font: 600 11px var(--font-sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status small {
  color: #655f55;
  font: 10px var(--font-sans);
}

@media (max-width: 700px) {
  .room {
    padding-inline: 10px;
  }

  .book-header {
    grid-template-columns: 1fr var(--header-center-gap) 1fr;
    gap: 0;
  }

  .header-actions {
    gap: 8px;
  }

  .share-page {
    width: 34px;
    min-height: 34px;
    justify-content: center;
    padding: 0;
  }

  .share-page-label {
    display: none;
  }

  .book-rig {
    height: min(64dvh, 640px);
  }

  .toc-trigger {
    padding: 6px 0;
  }

  .toc-panel {
    inset: auto 0 0;
    width: 100%;
    height: min(78dvh, 680px);
    padding: 22px 18px calc(18px + env(safe-area-inset-bottom));
    border-radius: 24px 24px 0 0;
    box-shadow: 0 -24px 60px rgb(31 28 22 / 22%);
    transform: translateY(104%);
  }

  body.toc-is-open .toc-panel {
    transform: translateY(0);
  }

  .toc-panel-header {
    padding-bottom: 18px;
  }

  .toc-panel h2 {
    font-size: 26px;
  }

  .toc-item {
    padding-block: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }

  .toc-panel,
  .toc-backdrop,
  .toc-item {
    transition: none;
  }
}

@media print {
  body {
    overflow: visible;
    background: white;
  }

  .book-header,
  .controls,
  .toc-backdrop,
  .toc-panel {
    display: none;
  }
}