:root {
  color-scheme: light;
  --ink: #182033;
  --indigo: #172a4a;
  --indigo-2: #223d68;
  --ochre: #a66932;
  --vermilion: #b93b2b;
  --paper: #f5efe3;
  --paper-deep: #e8dcc7;
  --white: #fffdf7;
  --muted: #6f6a61;
  --line: rgba(23, 42, 74, 0.2);
  --shadow: 0 18px 50px rgba(31, 34, 41, 0.12);
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(166, 105, 50, 0.10), transparent 30%),
    repeating-linear-gradient(0deg, rgba(23, 42, 74, 0.018) 0 1px, transparent 1px 5px),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.7;
}

a { color: inherit; }
button, input, select { font: inherit; }
button, .button { min-height: 44px; }
img { display: block; max-width: 100%; }

:where(a, button, input, select):focus-visible {
  outline: 3px solid #f5bd67;
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: .75rem 1rem;
  background: var(--white);
}
.skip-link:focus { top: 1rem; }

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  align-items: center;
  gap: 1.5rem;
  min-height: 72px;
  padding: .7rem clamp(1rem, 4vw, 4rem);
  color: var(--white);
  background: rgba(23, 42, 74, .97);
  border-bottom: 3px solid var(--ochre);
}

.brand {
  display: flex;
  align-items: center;
  gap: .8rem;
  text-decoration: none;
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: .05em;
}

.seal {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  color: var(--white);
  background: var(--vermilion);
  border: 1px solid rgba(255,255,255,.75);
  font-family: var(--serif);
}

.edition-badge {
  justify-self: end;
  padding: .26rem .58rem;
  color: #fff7e8;
  border: 1px solid rgba(255,255,255,.42);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: .25rem;
  align-items: center;
}

.site-nav a {
  padding: .48rem .65rem;
  color: rgba(255,255,255,.86);
  text-decoration: none;
  font-size: .88rem;
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a[aria-current="page"] {
  color: #fff;
  background: rgba(255,255,255,.1);
}

.nav-toggle {
  display: none;
  color: #fff;
  background: transparent;
  border: 1px solid rgba(255,255,255,.4);
}

.hero {
  min-height: min(760px, calc(100vh - 72px));
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
  align-items: stretch;
  color: var(--white);
  background:
    linear-gradient(110deg, rgba(16, 31, 56, .98), rgba(23, 42, 74, .92) 62%, rgba(88, 49, 31, .88)),
    url("assets/exhibits/plate_p005_left.jpg") center/cover;
}

.hero-copy {
  align-self: center;
  padding: clamp(3rem, 8vw, 8rem) clamp(1.4rem, 7vw, 7rem);
}

.eyebrow {
  margin: 0 0 .7rem;
  color: #e8bd7d;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1, h2, h3 {
  font-family: var(--serif);
  line-height: 1.25;
  text-wrap: balance;
}

h1 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(2.6rem, 6vw, 6.3rem);
  letter-spacing: .03em;
}

.hero-lead {
  max-width: 720px;
  margin: 1.25rem 0 0;
  color: rgba(255,255,255,.84);
  font-family: var(--serif);
  font-size: clamp(1.06rem, 1.6vw, 1.35rem);
}

.hero-panel {
  display: grid;
  align-content: end;
  gap: 1rem;
  padding: clamp(1.5rem, 4vw, 4rem);
  background: rgba(9, 17, 30, .38);
  border-left: 1px solid rgba(255,255,255,.18);
}

.hero-stat {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: .8rem;
  align-items: baseline;
  padding-bottom: .85rem;
  border-bottom: 1px solid rgba(255,255,255,.18);
}
.hero-stat strong {
  color: #f0c58b;
  font-family: var(--serif);
  font-size: 2rem;
}
.hero-stat span { color: rgba(255,255,255,.78); }

.cta-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .8rem;
  max-width: 920px;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: .8rem;
  padding: .8rem 1rem;
  color: var(--white);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.3);
  text-decoration: none;
  font-weight: 700;
}
.button:hover { background: rgba(255,255,255,.16); }
.button.primary { background: var(--vermilion); border-color: var(--vermilion); }
.button.dark { background: var(--indigo); border-color: var(--indigo); }
.button.paper { color: var(--indigo); background: var(--white); border-color: var(--line); }

.container {
  width: min(1240px, calc(100% - 2rem));
  margin-inline: auto;
}

.section { padding: clamp(3rem, 7vw, 7rem) 0; }
.section.compact { padding-block: 2rem; }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, .55fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 2.2rem;
}
.section-head h2 {
  margin: 0;
  color: var(--indigo);
  font-size: clamp(2rem, 4vw, 3.8rem);
}
.section-head p { margin: 0; color: var(--muted); }

.status-strip {
  padding: 1.1rem clamp(1rem, 5vw, 5rem);
  color: #3a2d20;
  background: #ead8ba;
  border-block: 1px solid #cda875;
}
.status-strip strong { color: var(--vermilion); }

.room-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.room-card {
  position: relative;
  min-height: 270px;
  display: flex;
  flex-direction: column;
  padding: 1.4rem;
  overflow: hidden;
  color: var(--white);
  background: var(--indigo);
  border-top: 5px solid var(--ochre);
  box-shadow: var(--shadow);
  text-decoration: none;
}
.room-card::after {
  content: "";
  position: absolute;
  inset: auto -35px -45px auto;
  width: 130px;
  height: 130px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 50%;
}
.room-card:hover { background: var(--indigo-2); }
.room-card .room-no {
  color: #dfb978;
  font-weight: 800;
  letter-spacing: .12em;
}
.room-card h3 { margin: 1rem 0 .55rem; font-size: 1.45rem; }
.room-card p { margin: 0; color: rgba(255,255,255,.72); }
.room-card .room-pages { margin-top: auto; padding-top: 1rem; font-size: .8rem; }
.room-card.room-12 { background: #5f2c28; border-color: var(--vermilion); }
.deferred-pill {
  display: inline-flex;
  width: fit-content;
  margin-top: .8rem;
  padding: .18rem .48rem;
  color: #fff7e8;
  background: rgba(185,59,43,.9);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .08em;
}

.page-hero {
  padding: clamp(3rem, 8vw, 7rem) 0 3rem;
  color: var(--white);
  background: linear-gradient(125deg, var(--indigo), #213e69 70%, #6b3f2e);
}
.page-hero h1 { font-size: clamp(2.3rem, 5vw, 4.8rem); }
.page-hero p { max-width: 760px; color: rgba(255,255,255,.78); font-size: 1.08rem; }

.room-progress {
  position: sticky;
  top: 72px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .65rem clamp(1rem, 4vw, 4rem);
  color: var(--white);
  background: rgba(20, 34, 57, .96);
  border-bottom: 1px solid rgba(255,255,255,.15);
}
.room-progress strong { white-space: nowrap; }
.progress-track {
  flex: 1;
  height: 3px;
  background: rgba(255,255,255,.2);
}
.progress-track span { display: block; height: 100%; width: 8.333%; background: #e0ad63; }

.exhibition-room {
  min-height: calc(100vh - 120px);
  padding: clamp(3rem, 7vw, 7rem) 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 122px;
}
.room-layout {
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
  gap: clamp(2rem, 6vw, 6rem);
}
.room-kicker { color: var(--vermilion); font-weight: 800; letter-spacing: .1em; }
.room-layout h2 { margin: .5rem 0 1rem; color: var(--indigo); font-size: clamp(2rem, 4vw, 3.7rem); }
.room-question {
  padding: 1.2rem;
  color: #4d351e;
  background: #ecddc6;
  border-left: 4px solid var(--ochre);
  font-family: var(--serif);
  font-size: 1.12rem;
}
.chapter-meta { color: var(--muted); font-size: .9rem; }

.timeline-list, .relationship-list, .search-results {
  display: grid;
  gap: .8rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.timeline-item, .relationship-item, .search-result {
  padding: 1rem 1.1rem;
  background: rgba(255,255,255,.6);
  border: 1px solid var(--line);
}
.timeline-item { border-left: 4px solid var(--ochre); }
.timeline-item p, .relationship-item p, .search-result p { margin: .3rem 0 0; color: var(--muted); }

.quote-card {
  position: relative;
  margin: 1.2rem 0;
  padding: 1.35rem 1.5rem 1.35rem 2.5rem;
  color: #312b24;
  background: var(--white);
  border-block: 1px solid var(--paper-deep);
  font-family: var(--serif);
  font-size: 1.08rem;
}
.quote-card::before {
  content: "“";
  position: absolute;
  left: .65rem;
  top: .1rem;
  color: var(--vermilion);
  font-size: 3rem;
}

.source-link {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  margin-top: .65rem;
  padding: .35rem .65rem;
  color: var(--indigo);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  font-weight: 700;
}

.related-room-link {
  display: inline-block;
  margin-top: .65rem;
  color: var(--indigo);
  font-weight: 800;
}

.room-local-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .55rem;
  margin-top: 1.2rem;
}
.room-local-nav a {
  display: grid;
  min-height: 44px;
  place-items: center;
  padding: .55rem .7rem;
  color: var(--indigo);
  background: var(--white);
  border: 1px solid var(--line);
  text-align: center;
  text-decoration: none;
  font-weight: 800;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.image-card {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 12px 28px rgba(31,34,41,.08);
}
.image-card img { width: 100%; aspect-ratio: 4/3; object-fit: contain; background: #d7cbb8; }
.image-card figcaption { padding: .85rem 1rem 1rem; color: var(--muted); }

.ch12-notice {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  color: #4c251e;
  background: #f0d5c6;
  border: 1px solid #cf8d75;
}
.ch12-notice strong { display: block; margin-bottom: .3rem; color: var(--vermilion); }

.book-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}
.book-controls {
  position: sticky;
  top: 96px;
  padding: 1rem;
  background: var(--white);
  border: 1px solid var(--line);
}
.book-controls label { display: block; margin: .7rem 0 .25rem; font-weight: 700; }
.book-controls select, .search-box input {
  width: 100%;
  min-height: 46px;
  padding: .6rem .7rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid #9b958c;
}
.book-actions { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; margin-top: .8rem; }
.book-actions button {
  color: var(--white);
  background: var(--indigo);
  border: 0;
  cursor: pointer;
}
.page-frame {
  min-height: 70vh;
  display: grid;
  place-items: start center;
  padding: 1rem;
  background: #cfc4b1;
  border: 1px solid #b6aa98;
  overflow: auto;
}
.page-frame img { width: min(100%, 920px); box-shadow: var(--shadow); }

.search-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .6rem;
  margin-bottom: 1.5rem;
}
.search-box button {
  padding-inline: 1.2rem;
  color: #fff;
  background: var(--vermilion);
  border: 0;
}
.search-note {
  padding: 1rem;
  color: #4d351e;
  background: #ead8ba;
  border: 1px solid #cda875;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.info-card {
  padding: 1.25rem;
  background: rgba(255,255,255,.62);
  border: 1px solid var(--line);
}
.info-card h3 { margin-top: 0; color: var(--indigo); }

.tour-stage {
  min-height: 420px;
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  gap: 2rem;
  padding: clamp(1.4rem, 4vw, 3rem);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.tour-actions { display: flex; gap: .6rem; margin-top: 1.2rem; }
.tour-actions button {
  padding-inline: 1rem;
  color: #fff;
  background: var(--indigo);
  border: 0;
}

.source-drawer {
  width: min(720px, calc(100% - 1rem));
  max-height: 88vh;
  margin: auto 0 auto auto;
  padding: 0;
  color: var(--ink);
  background: var(--paper);
  border: 0;
  box-shadow: -20px 0 60px rgba(0,0,0,.25);
}
.source-drawer::backdrop { background: rgba(9,17,30,.62); }
.drawer-head {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.2rem;
  color: #fff;
  background: var(--indigo);
}
.drawer-head h2 { margin: 0; font-size: 1.2rem; }
.drawer-close {
  width: 44px;
  color: #fff;
  background: transparent;
  border: 1px solid rgba(255,255,255,.5);
  cursor: pointer;
}
.drawer-body { padding: 1rem 1.2rem 2rem; }
.drawer-pages { display: flex; flex-wrap: wrap; gap: .5rem; }
.drawer-page {
  padding: .45rem .65rem;
  color: var(--indigo);
  background: #fff;
  border: 1px solid var(--line);
  text-decoration: none;
}
.drawer-preview { width: min(100%, 560px); margin: 1rem auto 0; }

.site-footer {
  padding: 2.5rem clamp(1rem, 5vw, 5rem);
  color: rgba(255,255,255,.72);
  background: #101d32;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
}
.site-footer a { color: #efc58a; }

@media (max-width: 1040px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-nav {
    grid-column: 1 / -1;
    overflow-x: auto;
    padding-bottom: .2rem;
  }
  .hero { grid-template-columns: 1fr; }
  .hero-panel { grid-template-columns: repeat(3, 1fr); border-left: 0; border-top: 1px solid rgba(255,255,255,.18); }
  .cta-grid, .room-grid, .image-grid, .info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .site-header { min-height: 70px; gap: .75rem; padding: .55rem 1rem; }
  .brand span:last-child { max-width: 180px; font-size: .86rem; line-height: 1.25; }
  .edition-badge { font-size: .62rem; }
  .room-progress { top: 70px; }
  .hero { min-height: auto; }
  .hero-copy { padding-block: 4rem 2.5rem; }
  .hero-panel { grid-template-columns: 1fr; padding-block: 1.5rem; }
  .cta-grid, .room-grid, .image-grid, .info-grid { grid-template-columns: 1fr; }
  .section-head, .room-layout, .tour-stage, .book-layout { grid-template-columns: 1fr; }
  .book-controls { position: static; }
  .page-frame { min-height: 50vh; padding: .35rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .search-box { grid-template-columns: 1fr; }
  .room-local-nav { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .site-header { grid-template-columns: minmax(0, 1fr) auto auto; }
  .nav-toggle {
    display: inline-grid;
    min-width: 56px;
    place-items: center;
    padding: .45rem .65rem;
    cursor: pointer;
  }
  .site-nav {
    display: none;
    grid-column: 1 / -1;
    align-items: stretch;
    overflow: visible;
    padding: .35rem 0 .2rem;
  }
  .site-nav[data-open="true"] { display: grid; }
  .site-nav a {
    min-height: 44px;
    display: flex;
    align-items: center;
    border-top: 1px solid rgba(255,255,255,.12);
  }
}

@media (max-width: 420px) {
  .container { width: min(100% - 1rem, 1240px); }
  h1 { font-size: 2.45rem; }
  .hero-copy { padding-inline: 1rem; }
  .room-card { min-height: 235px; }
  .site-nav a { font-size: .8rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}