:root {
  color-scheme: light;
  --ink: #171714;
  --ink-soft: #34332f;
  --stone: #68655d;
  --stone-light: #aaa59a;
  --paper: #f0ede5;
  --paper-deep: #e4dfd3;
  --white: #faf9f5;
  --cinnabar: #a63227;
  --cinnabar-dark: #78251f;
  --line: rgba(23, 23, 20, 0.18);
  --line-light: rgba(250, 249, 245, 0.23);
  --shadow: 0 24px 60px rgba(15, 15, 13, 0.18);
  --sans: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --serif: "Songti SC", SimSun, "Noto Serif CJK SC", Georgia, serif;
  --beilin-museum-art: url("modules/beilin/assets/generated/museum-stone-courtyard-v1.webp");
  --beilin-theme-art: url("modules/beilin/assets/generated/theme-rubbing-atlas-v1.webp");
  --beilin-catalog-art: url("modules/beilin/assets/generated/catalog-ink-steles-v1.webp");
  --beilin-card-interior-art: url("modules/beilin/assets/generated/card-interior-stele-collage-v2.webp");
  --beilin-method-art: url("modules/beilin/assets/generated/method-cinnabar-rubbing-v1.webp");
  --beilin-detail-art: url("modules/beilin/assets/generated/detail-stone-paper-v1.webp");
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 108px;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body:has(dialog[open]) {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

button,
a,
input,
select,
summary {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  left: 12px;
  top: 12px;
  padding: 10px 16px;
  background: var(--white);
  color: var(--ink);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid #d88976;
  outline-offset: 3px;
}

.hero {
  --hero-shift-y: 0px;
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  isolation: isolate;
  background: var(--ink);
  color: var(--white);
}

.hero-image {
  position: absolute;
  z-index: -2;
  inset: 0;
  background-image: url("assets/hero/beilin-gate.jpg");
  background-position: center 48%;
  background-size: cover;
  filter: saturate(0.82) contrast(1.03);
  transform: translate3d(0, var(--hero-shift-y), 0) scale(1.045);
  transform-origin: center center;
  will-change: transform;
}

.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(9, 9, 8, 0.5) 0, rgba(9, 9, 8, 0.08) 44%, rgba(9, 9, 8, 0.22) 100%),
    linear-gradient(180deg, rgba(9, 9, 8, 0.2), transparent 46%, rgba(9, 9, 8, 0.38));
  pointer-events: none;
}

.top-nav {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1600px, calc(100% - 64px));
  min-height: 76px;
  margin: 0 auto;
  border-bottom: 1px solid var(--line-light);
  font-size: 14px;
}

.wordmark,
.footer-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 650;
  letter-spacing: 0.14em;
}

.wordmark-copy {
  display: grid;
  gap: 1px;
  letter-spacing: 0;
}

.wordmark-copy strong {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.wordmark-copy small {
  color: rgba(250, 249, 245, 0.68);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.13em;
}

.seal {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid currentColor;
  background: var(--cinnabar);
  color: #fff7ec;
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1;
}

.top-nav-links {
  display: flex;
  gap: 34px;
}

.top-nav a {
  transition: color 180ms ease;
}

.top-nav a:hover {
  color: #efd7c6;
}

.hero-museum-name {
  position: absolute;
  z-index: 2;
  top: clamp(108px, 14vh, 154px);
  left: 50%;
  display: grid;
  gap: 7px;
  padding: 0;
  border-left: 0;
  text-align: center;
  transform: translateX(-50%);
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.78);
  animation: heroNameIn 760ms 100ms both cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-museum-name span {
  color: rgba(250, 249, 245, 0.72);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

.hero-museum-name strong {
  font-family: var(--serif);
  font-size: clamp(31px, 3.4vw, 52px);
  font-weight: 500;
  letter-spacing: 0.13em;
  line-height: 1.08;
}

.hero-panel {
  position: absolute;
  left: 50%;
  bottom: clamp(62px, 8vh, 96px);
  width: min(548px, calc(100% - 64px));
  padding: clamp(26px, 3.2vw, 42px);
  background: rgba(16, 16, 14, 0.86);
  border-left: 5px solid var(--cinnabar);
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
  transform: translateX(-50%);
  animation: heroPanelInCentered 820ms 180ms both cubic-bezier(0.22, 1, 0.36, 1);
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--cinnabar);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero .eyebrow {
  width: 100%;
  color: #efb19f;
  text-align: center;
}

.hero h1 {
  display: grid;
  gap: 0.08em;
  width: max-content;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(64px, 6.5vw, 104px);
  font-weight: 500;
  line-height: 0.88;
}

.hero h1 span {
  display: block;
  letter-spacing: 0.38em;
  text-indent: 0.38em;
  animation: heroTitleIn 720ms both cubic-bezier(0.22, 1, 0.36, 1);
}

.hero h1 span:first-child {
  animation-delay: 260ms;
}

.hero h1 span:last-child {
  animation-delay: 340ms;
}

.hero-lead {
  max-width: 560px;
  margin: 28px 0 30px;
  color: rgba(250, 249, 245, 0.82);
  font-size: clamp(15px, 1.35vw, 18px);
}

.primary-action {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  gap: 18px;
  border-bottom: 1px solid rgba(250, 249, 245, 0.6);
  font-weight: 680;
  letter-spacing: 0.04em;
  transition: border-color 180ms ease, color 180ms ease;
}

.primary-action:hover {
  border-color: #efb19f;
  color: #efb19f;
}

.hero-credit {
  position: absolute;
  right: max(32px, calc((100vw - 1600px) / 2));
  bottom: 20px;
  margin: 0;
  color: rgba(250, 249, 245, 0.78);
  font-size: 11px;
}

.hero-credit a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

@keyframes heroNameIn {
  from { opacity: 0; transform: translate3d(-50%, -16px, 0); }
  to { opacity: 1; transform: translate3d(-50%, 0, 0); }
}

@keyframes heroPanelInCentered {
  from { opacity: 0; transform: translate3d(-50%, 26px, 0); }
  to { opacity: 1; transform: translate3d(-50%, 0, 0); }
}

@keyframes heroTitleIn {
  from { opacity: 0; transform: translate3d(0, 20px, 0); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}

.museum-section,
.method-section {
  display: grid;
  grid-template-columns: 90px minmax(0, 1.55fr) minmax(280px, 0.75fr);
  gap: clamp(32px, 5vw, 80px);
  width: min(1440px, calc(100% - 64px));
  margin: 0 auto;
  padding: clamp(92px, 11vw, 160px) 0;
}

.museum-section {
  background:
    linear-gradient(90deg, rgba(240, 237, 229, 0.96), rgba(240, 237, 229, 0.78) 58%, rgba(240, 237, 229, 0.88)),
    var(--beilin-museum-art) center / cover no-repeat;
}

.section-index {
  padding-top: 3px;
  border-top: 1px solid var(--ink);
  color: var(--stone);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.museum-copy h2,
.catalog-heading h2,
.method-section h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(40px, 4.5vw, 70px);
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.museum-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 34px;
  margin: 38px 0 28px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 17px;
}

.museum-columns p {
  margin: 0;
  text-indent: 2em;
}

.text-link,
.text-button {
  display: inline-block;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--cinnabar-dark);
  cursor: pointer;
  font-weight: 700;
}

.museum-stats {
  margin: 0;
  border-top: 1px solid var(--ink);
}

.museum-stats div {
  display: grid;
  grid-template-columns: 100px 1fr;
  align-items: baseline;
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.museum-stats dt {
  color: var(--cinnabar);
  font-family: var(--serif);
  font-size: 48px;
  line-height: 1;
}

.museum-stats dd {
  margin: 0;
  color: var(--stone);
  font-size: 13px;
}

.theme-section {
  padding: clamp(90px, 10vw, 150px) max(32px, calc((100vw - 1600px) / 2));
  overflow: hidden;
  background:
    linear-gradient(110deg, rgba(222, 216, 202, 0.96), rgba(222, 216, 202, 0.75) 55%, rgba(222, 216, 202, 0.9)),
    var(--beilin-theme-art) center / cover no-repeat;
}

.theme-heading {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) minmax(300px, 560px);
  align-items: end;
  gap: clamp(38px, 7vw, 110px);
  margin-bottom: 52px;
}

.theme-heading h2 {
  max-width: none;
  margin: 0;
  white-space: nowrap;
  font-family: var(--serif);
  font-size: clamp(40px, 4.7vw, 72px);
  font-weight: 500;
  letter-spacing: 0.015em;
  line-height: 1.12;
}

.theme-intro {
  margin: 0 0 6px;
  color: #555148;
  font-family: var(--serif);
  font-size: 16px;
}

.theme-intro strong {
  color: var(--cinnabar-dark);
  font-weight: 600;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-rows: 252px;
  gap: 16px;
}

.theme-card {
  position: relative;
  min-width: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: #26251f;
  color: var(--white);
  cursor: pointer;
  text-align: left;
  isolation: isolate;
}

.theme-card-stele {
  grid-column: span 7;
  grid-row: span 2;
}

.theme-card-inscription,
.theme-card-epitaph {
  grid-column: span 5;
}

.theme-card-objects {
  grid-column: span 5;
}

.theme-card-special {
  grid-column: span 7;
}

.theme-card img,
.theme-card-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.theme-card img {
  z-index: -2;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.04);
  transition: transform 700ms cubic-bezier(0.22, 1, 0.36, 1), filter 420ms ease;
}

.theme-card-shade {
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(12, 12, 10, 0.04) 22%, rgba(12, 12, 10, 0.84) 100%),
    linear-gradient(90deg, rgba(12, 12, 10, 0.48), transparent 62%);
}

.theme-card-copy {
  position: absolute;
  left: clamp(22px, 4vw, 52px);
  bottom: clamp(24px, 4vw, 48px);
  display: grid;
  gap: 4px;
  max-width: calc(100% - 44px);
}

.theme-card-copy small {
  color: #e3aa98;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.2;
  max-width: 100%;
}

.theme-card-copy strong {
  font-family: var(--serif);
  font-size: clamp(32px, 4vw, 64px);
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 0.95;
  word-break: keep-all;
  max-width: 100%;
}

.theme-card-copy > span {
  color: rgba(250, 249, 245, 0.7);
  font-size: 11px;
  line-height: 1.4;
  max-width: 100%;
}

.theme-card-copy b {
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
}

.theme-card-note {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 5px 8px;
  border: 1px solid rgba(250, 249, 245, 0.3);
  background: rgba(12, 12, 10, 0.48);
  color: rgba(250, 249, 245, 0.72);
  font-size: 8px;
  letter-spacing: 0.08em;
}

.theme-card::after {
  content: "进入该主题  →";
  position: absolute;
  right: 18px;
  bottom: 18px;
  color: rgba(250, 249, 245, 0);
  font-size: 10px;
  letter-spacing: 0.1em;
  transform: translate3d(-10px, 0, 0);
  transition: color 260ms ease, transform 260ms ease;
}

.theme-card:hover img,
.theme-card:focus-visible img {
  filter: saturate(0.92) contrast(1.08);
  transform: scale(1.035);
}

.theme-card:hover::after,
.theme-card:focus-visible::after {
  color: rgba(250, 249, 245, 0.82);
  transform: translate3d(0, 0, 0);
}

.catalog-section {
  padding: clamp(84px, 9vw, 136px) max(32px, calc((100vw - 1600px) / 2));
  background:
    linear-gradient(110deg, rgba(23, 23, 20, 0.96), rgba(23, 23, 20, 0.78) 54%, rgba(23, 23, 20, 0.94)),
    var(--beilin-catalog-art) center / cover no-repeat;
  color: var(--white);
}

.catalog-heading {
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(280px, 520px);
  gap: 64px;
  align-items: end;
  margin-bottom: 54px;
}

.catalog-heading .section-kicker {
  color: #d77e69;
}

.catalog-intro {
  margin: 0 0 8px;
  color: rgba(250, 249, 245, 0.68);
  font-family: var(--serif);
  font-size: 16px;
}

.catalog-controls {
  position: sticky;
  z-index: 8;
  top: 0;
  margin: 0 0 42px;
  padding: 18px 0;
  background: rgba(23, 23, 20, 0.97);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.search-field {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  max-width: 760px;
  padding: 0 0 14px;
  border-bottom: 1px solid rgba(250, 249, 245, 0.48);
}

.search-field > span {
  color: #d77e69;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.16em;
}

.search-field input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--white);
  font-size: 18px;
}

.search-field input::placeholder {
  color: rgba(250, 249, 245, 0.42);
}

kbd {
  padding: 2px 7px;
  border: 1px solid rgba(250, 249, 245, 0.32);
  color: rgba(250, 249, 245, 0.58);
  font-family: var(--sans);
  font-size: 11px;
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 14px;
}

.category-button,
.quiet-button,
.music-filter-button,
.detail-nav-button,
.lightbox-toolbar button,
.lightbox-toolbar a {
  min-height: 42px;
  border: 1px solid rgba(250, 249, 245, 0.28);
  background: transparent;
  color: rgba(250, 249, 245, 0.72);
  cursor: pointer;
  padding: 8px 14px;
}

.category-button {
  font-size: 13px;
}

.category-button:hover,
.category-button[aria-pressed="true"] {
  border-color: #d77e69;
  background: var(--cinnabar);
  color: var(--white);
}

.category-button .count {
  margin-left: 7px;
  color: currentColor;
  opacity: 0.66;
  font-size: 11px;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(250, 249, 245, 0.64);
  font-size: 12px;
}

.control-row select {
  min-height: 42px;
  border: 1px solid rgba(250, 249, 245, 0.25);
  border-radius: 0;
  background: var(--ink-soft);
  color: var(--white);
  padding: 6px 34px 6px 12px;
}

.quiet-button {
  font-size: 12px;
}

.music-filter-button {
  min-height: 42px;
  border: 1px solid rgba(212, 177, 102, 0.5);
  background: rgba(212, 177, 102, 0.08);
  color: #ead7a6;
  cursor: pointer;
  padding: 8px 13px;
  font-size: 12px;
}

.music-filter-button b {
  margin-left: 5px;
  font-size: 10px;
  opacity: 0.72;
}

.music-filter-button:hover,
.music-filter-button[aria-pressed="true"] {
  border-color: #d4b166;
  background: #d4b166;
  color: #201e18;
}

.result-count {
  margin: 0 0 0 auto;
  font-variant-numeric: tabular-nums;
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px 22px;
}

.artifact-card {
  min-width: 0;
  content-visibility: auto;
  contain-intrinsic-size: 420px 620px;
  transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1);
}

.artifact-card-button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.card-image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: #2b2a26;
}

.card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 260ms ease, opacity 180ms ease;
}

.artifact-card-button:hover .card-image-wrap img,
.artifact-card-button:focus-visible .card-image-wrap img {
  transform: scale(1.018);
}

.artifact-card:hover {
  transform: translate3d(0, -5px, 0);
}

.js-motion .reveal-item {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition:
    opacity 620ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 620ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0ms);
}

.js-motion .reveal-item.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.artifact-card.special .card-image-wrap {
  outline: 2px solid var(--cinnabar);
  outline-offset: -2px;
}

.special-marker {
  position: absolute;
  top: 0;
  left: 0;
  padding: 8px 10px;
  background: var(--cinnabar);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.music-marker {
  position: absolute;
  top: 0;
  right: 0;
  padding: 8px 10px;
  background: rgba(29, 27, 21, 0.9);
  border-left: 1px solid rgba(234, 215, 166, 0.58);
  border-bottom: 1px solid rgba(234, 215, 166, 0.58);
  color: #f0d999;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  backdrop-filter: blur(5px);
}

.card-number {
  position: absolute;
  right: 10px;
  bottom: 8px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 1px 5px #000;
}

.card-copy {
  padding: 16px 0 0;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 7px;
  color: rgba(250, 249, 245, 0.54);
  font-size: 11px;
}

.card-category {
  color: #d77e69;
}

.card-copy h3 {
  min-height: 2.8em;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(18px, 1.5vw, 23px);
  font-weight: 500;
  line-height: 1.35;
}

.card-period {
  min-height: 2.8em;
  margin: 9px 0 0;
  color: rgba(250, 249, 245, 0.56);
  font-size: 12px;
  line-height: 1.4;
}

.empty-state,
.load-error {
  padding: 72px 20px;
  border-top: 1px solid var(--line-light);
  text-align: center;
}

.load-error code {
  color: #efb19f;
}

.method-section {
  grid-template-columns: 90px minmax(260px, 0.72fr) minmax(520px, 1.28fr);
  position: relative;
}

.method-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.method-steps li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 28px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.method-steps span {
  color: var(--cinnabar);
  font-weight: 720;
}

.method-steps p {
  margin: 0;
  color: var(--ink-soft);
  text-indent: 2em;
}

.method-note {
  grid-column: 3;
  padding: 22px 0 0 158px;
  color: var(--stone);
  font-size: 13px;
}

.method-note strong {
  color: var(--ink);
}

.method-note p {
  margin: 5px 0 0;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 44px;
  align-items: end;
  padding: 48px max(32px, calc((100vw - 1600px) / 2));
  background: #0e0e0c;
  color: rgba(250, 249, 245, 0.72);
  font-size: 12px;
}

.footer-mark {
  color: var(--white);
  letter-spacing: 0.06em;
}

.footer-mark p,
.footer-note {
  margin: 3px 0 0;
  color: rgba(250, 249, 245, 0.5);
  font-weight: 400;
  letter-spacing: 0;
}

.footer-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer-sources p {
  flex-basis: 100%;
  margin: 0;
  color: rgba(250, 249, 245, 0.42);
}

.footer-sources a:hover {
  color: var(--white);
  text-decoration: underline;
}

dialog {
  padding: 0;
  border: 0;
}

dialog::backdrop {
  background: rgba(8, 8, 7, 0.82);
  backdrop-filter: blur(4px);
}

.artifact-dialog {
  width: min(1380px, calc(100vw - 36px));
  max-width: none;
  max-height: calc(100svh - 32px);
  margin: auto;
  background:
    linear-gradient(rgba(240, 237, 229, 0.93), rgba(240, 237, 229, 0.96)),
    var(--beilin-detail-art) center / cover no-repeat;
  color: var(--ink);
  box-shadow: var(--shadow);
}

.detail-shell {
  min-height: 80vh;
}

.detail-header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding: clamp(28px, 4vw, 58px);
  border-bottom: 1px solid var(--line);
}

.detail-category {
  margin: 0 0 10px;
  color: var(--cinnabar);
  font-size: 12px;
  font-weight: 740;
  letter-spacing: 0.14em;
}

.detail-header h2 {
  max-width: 1000px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(36px, 4.4vw, 64px);
  font-weight: 500;
  line-height: 1.12;
}

.detail-period {
  margin: 14px 0 0;
  color: var(--stone);
}

.icon-button {
  display: inline-grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  font-size: 28px;
  line-height: 1;
}

.detail-gallery {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 116px;
  gap: 16px;
  padding: clamp(24px, 4vw, 58px);
  background: #23231f;
  color: var(--white);
}

.main-image-button {
  --gallery-art: url("assets/editorial/theme-stele.webp");
  position: relative;
  display: grid;
  min-height: min(68vh, 760px);
  place-items: center;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: #151513;
  cursor: zoom-in;
  isolation: isolate;
}

.main-image-button img {
  position: relative;
  z-index: 3;
  width: 100%;
  height: min(68vh, 760px);
  object-fit: contain;
  filter: drop-shadow(0 12px 34px rgba(0, 0, 0, 0.5));
  transition: opacity 180ms ease, transform 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.main-image-button.is-changing img {
  opacity: 0.18;
  transform: scale(0.992);
}

.gallery-art-layer {
  position: absolute;
  z-index: 0;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(10, 10, 8, 0.18), rgba(10, 10, 8, 0.72) 38%, rgba(10, 10, 8, 0.72) 62%, rgba(10, 10, 8, 0.18)),
    var(--gallery-art);
  background-position: center;
  background-size: cover;
  filter: saturate(0.62) brightness(0.7) contrast(1.05);
  opacity: 0.88;
  transform: scale(1.025);
}

.main-image-button::before {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 8, 7, 0.25), transparent 22%, transparent 74%, rgba(8, 8, 7, 0.34)),
    radial-gradient(circle at center, transparent 0 26%, rgba(8, 8, 7, 0.16) 58%, rgba(8, 8, 7, 0.42));
  pointer-events: none;
}

.gallery-side-note {
  position: absolute;
  z-index: 2;
  top: 50%;
  display: flex;
  max-height: 76%;
  align-items: flex-start;
  gap: 12px;
  color: rgba(250, 249, 245, 0.72);
  writing-mode: vertical-rl;
  transform: translateY(-50%);
  text-shadow: 0 2px 14px #000;
  pointer-events: none;
}

.gallery-side-note-left {
  left: clamp(18px, 4.5%, 62px);
}

.gallery-side-note-right {
  right: clamp(18px, 4.5%, 62px);
}

.gallery-side-note small {
  color: #e2a18f;
  font-size: 9px;
  font-style: normal;
  letter-spacing: 0.22em;
}

.gallery-side-note strong {
  max-height: 420px;
  overflow: hidden;
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.2;
}

.gallery-side-note em {
  color: rgba(250, 249, 245, 0.42);
  font-size: 8px;
  font-style: normal;
  letter-spacing: 0.1em;
}

.gallery-art-disclosure,
.zoom-hint {
  position: absolute;
  z-index: 4;
  bottom: 12px;
  right: 12px;
  padding: 7px 10px;
  background: rgba(12, 12, 10, 0.78);
  color: rgba(255, 255, 255, 0.8);
  font-size: 11px;
}

.gallery-art-disclosure {
  right: auto;
  left: 12px;
  color: rgba(250, 249, 245, 0.64);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.photo-thumbs {
  display: flex;
  max-height: min(68vh, 760px);
  flex-direction: column;
  gap: 9px;
  overflow-y: auto;
  scrollbar-color: var(--stone) transparent;
}

.photo-thumb {
  position: relative;
  flex: 0 0 auto;
  width: 100%;
  aspect-ratio: 4 / 3;
  padding: 0;
  overflow: hidden;
  border: 1px solid transparent;
  background: #34332e;
  cursor: pointer;
}

.photo-thumb[aria-current="true"] {
  border-color: #e0a18f;
}

.photo-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-thumb span {
  position: absolute;
  right: 3px;
  bottom: 2px;
  padding: 1px 4px;
  background: rgba(0, 0, 0, 0.72);
  color: #fff;
  font-size: 9px;
}

.image-caption {
  grid-column: 1 / -1;
  color: rgba(250, 249, 245, 0.62);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.detail-body {
  display: grid;
  grid-template-columns: minmax(240px, 0.34fr) minmax(0, 1fr);
  gap: clamp(36px, 7vw, 110px);
  padding: clamp(52px, 7vw, 94px) clamp(28px, 6vw, 90px);
}

.fact-panel {
  align-self: start;
  border-top: 2px solid var(--ink);
}

.fact-panel dl {
  margin: 0;
}

.fact-panel dl div {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.fact-panel dt {
  color: var(--stone);
  font-size: 12px;
}

.fact-panel dd {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: 13px;
}

.subitems {
  margin-top: 32px;
}

.subitems h3 {
  margin: 0 0 12px;
  font-size: 13px;
}

.subitems ul {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.subitems li {
  padding: 4px 8px;
  border: 1px solid var(--line);
  font-size: 11px;
}

.research-copy {
  display: grid;
  gap: 48px;
}

.research-copy section {
  position: relative;
  padding-left: 62px;
}

.research-index {
  position: absolute;
  left: 0;
  top: 3px;
  margin: 0;
  color: var(--cinnabar);
  font-family: var(--serif);
  font-size: 14px;
}

.research-copy h3,
.source-section h3 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
}

.research-copy section > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.9;
  text-indent: 2em;
}

.research-copy .music-research {
  margin-left: 18px;
  padding: 34px 36px 34px 82px;
  border: 1px solid rgba(151, 101, 38, 0.32);
  background:
    linear-gradient(135deg, rgba(204, 164, 84, 0.16), transparent 52%),
    rgba(247, 239, 218, 0.62);
  box-shadow: 0 20px 48px rgba(70, 49, 23, 0.08);
}

.music-research .research-index {
  left: 28px;
  top: 38px;
  color: #92621f;
  font-size: 18px;
}

.music-tier {
  margin: 0 0 9px;
  color: #8f5d1f;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.music-research > #musicSummary {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.9;
}

.music-research ul {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.music-research li {
  position: relative;
  padding-left: 19px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.75;
}

.music-research li::before {
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 1px;
  background: #9e6c2d;
  content: "";
}

.research-copy .music-boundary {
  margin: 24px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(142, 94, 31, 0.22);
  color: #806b4f;
  font-family: var(--sans);
  font-size: 11px;
  line-height: 1.65;
}

.source-section {
  padding: clamp(46px, 6vw, 82px) clamp(28px, 6vw, 90px);
  border-top: 1px solid var(--line);
  background:
    linear-gradient(rgba(228, 223, 211, 0.88), rgba(228, 223, 211, 0.94)),
    var(--beilin-detail-art) center / cover no-repeat;
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.source-item {
  min-height: 132px;
  padding: 20px;
  background:
    linear-gradient(rgba(250, 249, 245, 0.9), rgba(240, 237, 229, 0.94)),
    var(--beilin-detail-art) center / cover no-repeat;
}

.source-item .source-layer {
  margin: 0 0 7px;
  color: var(--cinnabar);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.source-item a {
  font-weight: 720;
  text-decoration: underline;
  text-decoration-color: rgba(166, 50, 39, 0.4);
  text-underline-offset: 3px;
}

.source-item p:last-child {
  margin: 8px 0 0;
  color: var(--stone);
  font-size: 12px;
}

.ocr-details {
  margin-top: 30px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.ocr-details summary {
  cursor: pointer;
  font-weight: 700;
}

.ocr-warning {
  color: var(--cinnabar-dark);
  font-size: 12px;
}

.ocr-details pre {
  max-height: 360px;
  margin: 16px 0 0;
  padding: 20px;
  overflow: auto;
  background: #d8d2c5;
  color: #292823;
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.detail-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
  padding: 28px clamp(28px, 6vw, 90px);
  background: var(--ink);
  color: var(--white);
}

.detail-nav-button:first-child {
  justify-self: start;
}

.detail-nav-button:last-child {
  justify-self: end;
}

.detail-footer p {
  margin: 0;
  color: rgba(250, 249, 245, 0.58);
  font-size: 12px;
}

.lightbox {
  width: 100vw;
  max-width: none;
  height: 100svh;
  max-height: none;
  background: #090908;
  color: var(--white);
}

.lightbox-toolbar {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 8px 16px 8px 24px;
  border-bottom: 1px solid var(--line-light);
  background: #11110f;
}

.lightbox-toolbar p {
  margin: 0;
  color: rgba(250, 249, 245, 0.7);
  font-size: 12px;
}

.lightbox-toolbar > div {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lightbox-toolbar button,
.lightbox-toolbar a {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
}

.lightbox-toolbar .icon-button {
  padding: 0;
  font-size: 25px;
}

.lightbox-stage {
  position: relative;
  display: grid;
  height: calc(100svh - 64px);
  place-items: center;
  overflow: auto;
}

.lightbox-stage img {
  max-width: calc(100vw - 130px);
  max-height: calc(100svh - 100px);
  object-fit: contain;
  cursor: zoom-in;
  transform-origin: center center;
  transform: scale(1);
}

.lightbox-stage.is-zoomed {
  display: block;
  padding: 24px 72px;
}

.lightbox-stage.is-zoomed img {
  max-width: none;
  max-height: none;
  margin: 0 auto;
  cursor: zoom-out;
}

.lightbox-arrow {
  position: fixed;
  z-index: 3;
  top: 50%;
  width: 48px;
  height: 72px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(9, 9, 8, 0.72);
  color: var(--white);
  cursor: pointer;
  font-size: 23px;
}

.lightbox-arrow.previous {
  left: 12px;
}

.lightbox-arrow.next {
  right: 12px;
}

@media (max-width: 1160px) {
  .catalog-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .museum-section,
  .method-section {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .museum-stats,
  .method-steps,
  .method-note {
    grid-column: 2;
  }

  .museum-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin-top: 10px;
  }

  .museum-stats div {
    display: block;
    padding-right: 18px;
  }

  .museum-stats dd {
    margin-top: 8px;
  }

  .method-note {
    padding-left: 0;
  }

  .theme-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: 310px;
  }

  .theme-card-stele,
  .theme-card-inscription,
  .theme-card-epitaph,
  .theme-card-objects,
  .theme-card-special {
    grid-column: span 1;
    grid-row: span 1;
  }

  .theme-card-stele {
    grid-column: 1 / -1;
    min-height: 430px;
  }
}

@media (max-width: 820px) {
  html {
    scroll-padding-top: 78px;
  }

  .top-nav {
    width: calc(100% - 32px);
  }

  .top-nav-links {
    gap: 16px;
  }

  .top-nav-links a:first-child {
    display: none;
  }

  .hero-museum-name {
    top: 98px;
    left: 18px;
  }

  .hero-panel {
    left: 16px;
    bottom: 46px;
    width: calc(100% - 32px);
    padding: 28px 24px;
  }

  .hero h1 {
    font-size: clamp(58px, 16vw, 84px);
  }

  .hero-credit {
    right: 16px;
    bottom: 12px;
    max-width: calc(100% - 32px);
    font-size: 9px;
  }

  .museum-section,
  .method-section {
    grid-template-columns: 1fr;
    width: calc(100% - 36px);
    padding: 80px 0;
  }

  .section-index {
    width: 54px;
  }

  .museum-stats,
  .method-steps,
  .method-note {
    grid-column: 1;
  }

  .museum-columns {
    grid-template-columns: 1fr;
  }

  .theme-section {
    padding: 80px 18px;
  }

  .theme-heading {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .theme-heading h2 {
    white-space: normal;
  }

  .theme-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: 290px;
  }

  .theme-card-stele,
  .theme-card-inscription,
  .theme-card-epitaph,
  .theme-card-objects,
  .theme-card-special {
    grid-column: 1;
    min-height: 0;
  }

  .catalog-section {
    padding: 76px 18px;
  }

  .catalog-heading {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .catalog-controls {
    margin-inline: -2px;
  }

  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px 14px;
  }

  .card-copy h3 {
    font-size: 17px;
  }

  .detail-gallery {
    grid-template-columns: 1fr;
  }

  .main-image-button,
  .main-image-button img {
    min-height: 0;
    height: 62vh;
  }

  .gallery-side-note {
    display: none;
  }

  .photo-thumbs {
    max-height: none;
    flex-direction: row;
    overflow-x: auto;
  }

  .photo-thumb {
    width: 100px;
  }

  .detail-body {
    grid-template-columns: 1fr;
  }

  .source-list {
    grid-template-columns: 1fr;
  }

  .site-footer {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 540px) {
  .wordmark-copy small {
    display: none;
  }

  .wordmark-copy strong {
    font-size: 13px;
  }

  .hero-image {
    background-position: 56% center;
  }

  .hero-panel {
    border-left-width: 3px;
  }

  .hero-museum-name strong {
    font-size: 27px;
    letter-spacing: 0.08em;
  }

  .hero-museum-name span {
    font-size: 8px;
  }

  .hero-lead {
    margin: 20px 0 20px;
    font-size: 14px;
  }

  .theme-grid {
    grid-auto-rows: 250px;
  }

  .theme-card-copy strong {
    font-size: 40px;
  }

  .museum-stats {
    grid-template-columns: 1fr;
  }

  .museum-stats div {
    display: grid;
  }

  .catalog-grid {
    grid-template-columns: 1fr;
  }

  .card-image-wrap {
    aspect-ratio: 5 / 4;
  }

  .card-copy h3,
  .card-period {
    min-height: 0;
  }

  .control-row {
    flex-wrap: wrap;
  }

  .result-count {
    flex-basis: 100%;
    margin-left: 0;
  }

  .method-steps li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .artifact-dialog {
    width: 100vw;
    max-height: 100svh;
  }

  .detail-header,
  .detail-gallery,
  .detail-body,
  .source-section {
    padding-inline: 18px;
  }

  .main-image-button,
  .main-image-button img {
    height: 54vh;
  }

  .gallery-art-disclosure {
    display: none;
  }

  .research-copy section {
    padding-left: 38px;
  }

  .research-copy .music-research {
    margin-left: 0;
    padding: 26px 18px 26px 50px;
  }

  .music-research .research-index {
    left: 18px;
    top: 30px;
  }

  .detail-footer {
    grid-template-columns: 1fr 1fr;
    padding-inline: 18px;
  }

  .detail-footer p {
    display: none;
  }

  .lightbox-toolbar {
    align-items: flex-start;
    padding: 8px;
  }

  .lightbox-toolbar p {
    display: none;
  }

  .lightbox-toolbar > div {
    width: 100%;
    justify-content: flex-end;
  }

  .lightbox-toolbar a {
    display: none;
  }

  .lightbox-stage img {
    max-width: calc(100vw - 28px);
  }

  .lightbox-arrow {
    top: auto;
    bottom: 14px;
    width: 52px;
    height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .hero-image {
    will-change: auto;
    transform: scale(1.015);
  }

  .js-motion .reveal-item {
    opacity: 1;
    transform: none;
  }
}

/* v5.0 · responsive image delivery and low-end rendering safeguards */
.hero-image {
  background-image: url("assets/hero/beilin-gate.jpg");
  background-image: image-set(
    url("assets/hero/beilin-gate-960.webp") type("image/webp") 1x,
    url("assets/hero/beilin-gate.jpg") type("image/jpeg") 1x
  );
}

.artifact-card {
  contain: layout paint style;
  content-visibility: auto;
}

.card-image-wrap img,
.photo-thumb img,
.main-image-button img,
.lightbox-stage img {
  backface-visibility: hidden;
}

@media (min-width: 900px) {
  .hero-image {
    background-image: url("assets/hero/beilin-gate.jpg");
    background-image: image-set(
      url("assets/hero/beilin-gate-1600.webp") type("image/webp") 1x,
      url("assets/hero/beilin-gate.jpg") type("image/jpeg") 1x
    );
  }
}

@media (hover: none), (pointer: coarse), (update: slow) {
  .artifact-card:hover,
  .artifact-card-button:hover .card-image-wrap img,
  .artifact-card-button:focus-visible .card-image-wrap img,
  .theme-card:hover img {
    filter: none;
    transform: none;
  }

  .corner-orbit {
    animation: none;
  }
}

/* v4.1 · strict separation between documentary signage and object imagery */

/* v4.2 · compact image-led catalog cards */
.artifact-card-button {
  grid-template-columns: 112px minmax(0, 1fr);
}

.artifact-card-button > .card-image-wrap {
  display: block;
  min-height: 196px;
  aspect-ratio: auto;
  border-right: 1px solid rgba(250, 249, 245, 0.12);
}

.card-corner-effect {
  display: none;
}

.card-copy {
  padding: 13px 14px 12px;
}

.card-copy h3 {
  max-width: 100%;
  font-size: 21px;
  line-height: 1.18;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero h1 {
  width: auto;
  max-width: 100%;
  font-size: clamp(54px, 6vw, 92px);
  line-height: 0.98;
}

.hero h1 span {
  letter-spacing: 0.16em;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .artifact-card-button {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .card-copy {
    padding-right: 12px;
  }
}

.card-image-wrap.is-editorial-placeholder img {
  opacity: 0.72;
  filter: saturate(0.45) contrast(1.06) brightness(0.76);
}

.card-image-wrap.is-editorial-placeholder::before {
  position: absolute;
  z-index: 2;
  inset: 0;
  border: 1px solid rgba(212, 177, 102, 0.18);
  background:
    linear-gradient(145deg, rgba(14, 14, 12, 0.08), rgba(14, 14, 12, 0.52)),
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(239, 221, 178, 0.035) 18px 19px);
  content: "";
  pointer-events: none;
}

.card-placeholder-note {
  position: absolute;
  z-index: 3;
  right: 8px;
  bottom: 8px;
  left: 8px;
  padding: 6px 7px;
  border-left: 2px solid #d4b166;
  background: rgba(14, 14, 12, 0.78);
  color: rgba(250, 249, 245, 0.78);
  font-size: 8px;
  line-height: 1.45;
  letter-spacing: 0.06em;
}

.main-image-button.has-no-artifact-photo {
  cursor: default;
}

.main-image-button img[hidden] {
  display: none;
}

.main-image-button.has-no-artifact-photo .gallery-art-layer {
  filter: saturate(0.58) brightness(0.78) contrast(1.04);
  opacity: 0.96;
}

.main-image-button.has-no-artifact-photo::before {
  background:
    linear-gradient(180deg, rgba(8, 8, 7, 0.14), rgba(8, 8, 7, 0.42)),
    radial-gradient(circle at center, rgba(166, 50, 39, 0.08), rgba(8, 8, 7, 0.46) 70%);
}

.gallery-empty-note {
  position: relative;
  z-index: 4;
  display: grid;
  max-width: min(330px, 58%);
  gap: 12px;
  padding: 24px 28px;
  border-top: 1px solid rgba(225, 189, 111, 0.72);
  border-bottom: 1px solid rgba(225, 189, 111, 0.36);
  background: rgba(15, 15, 13, 0.66);
  color: rgba(250, 249, 245, 0.88);
  text-align: center;
  pointer-events: none;
}

.gallery-empty-note[hidden] {
  display: none;
}

.gallery-empty-note strong {
  font-family: var(--serif);
  font-size: clamp(20px, 2.3vw, 30px);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.gallery-empty-note small {
  color: rgba(250, 249, 245, 0.58);
  font-size: 10px;
  line-height: 1.8;
  letter-spacing: 0.06em;
}

/* --------------------------------------------------------------------------
   v4 · Ad Fontes compact archive module
   The earlier exhibition-scale rules remain above as a reversible baseline.
   These overrides make the catalog the primary reading surface.
   -------------------------------------------------------------------------- */

.hero {
  height: clamp(500px, 64svh, 680px);
  min-height: 500px;
  max-height: 680px;
}

.top-nav {
  top: 22px;
  width: min(1540px, calc(100% - 44px));
  padding: 10px 12px;
  border: 1px solid rgba(250, 249, 245, 0.22);
  background: rgba(17, 17, 15, 0.78);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.15);
}

.wordmark-copy strong {
  font-size: 12px;
  letter-spacing: 0.09em;
}

.wordmark-copy small {
  margin-top: 2px;
  color: rgba(250, 249, 245, 0.55);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.top-nav-links {
  gap: clamp(12px, 2vw, 28px);
}

.top-nav-links a {
  position: relative;
  font-size: 11px;
  letter-spacing: 0.08em;
}

.top-nav-links a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  background: #d77e69;
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.top-nav-links a:hover::after,
.top-nav-links a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.platform-return {
  color: #e4b2a4;
}

.hero-image {
  background-position: center 46%;
}

.hero::after {
  background:
    linear-gradient(90deg, rgba(11, 11, 9, 0.9) 0%, rgba(11, 11, 9, 0.54) 46%, rgba(11, 11, 9, 0.22) 72%),
    linear-gradient(180deg, rgba(11, 11, 9, 0.24), rgba(11, 11, 9, 0.7));
}

.hero-museum-name {
  top: 102px;
  right: max(28px, calc((100vw - 1540px) / 2));
  left: auto;
  align-items: flex-end;
  text-align: right;
}

.hero-museum-name strong {
  max-width: none;
  color: rgba(250, 249, 245, 0.96);
  font-size: clamp(28px, 3.1vw, 48px);
  letter-spacing: 0.12em;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.55);
}

.hero-museum-name span {
  color: rgba(250, 249, 245, 0.58);
  letter-spacing: 0.28em;
}

.hero-panel { left: clamp(330px, 25%, 520px); bottom: 44px; width: min(620px, calc(100% - 48px)); transform: translateX(-50%); padding: 42px 48px 38px;
  border: 1px solid rgba(250, 249, 245, 0.26);
  border-left: 3px solid #b84736;
  background: rgba(19, 19, 16, 0.84);
  box-shadow: 0 22px 64px rgba(0, 0, 0, 0.22);
}

.hero h1 {
  display: flex;
  justify-content: center;
  gap: clamp(42px, 5.5vw, 92px);
  align-items: baseline;
  margin-top: 9px;
  font-size: clamp(58px, 7vw, 104px);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.hero h1 span {
  display: block;
  flex: 0 0 auto;
  letter-spacing: 0.02em;
}

.hero-lead {
  max-width: 620px;
  margin: 18px auto 20px;
  font-size: 14px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.primary-action,
.secondary-action {
  min-height: 42px;
  padding: 11px 16px;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.secondary-action {
  border: 1px solid rgba(250, 249, 245, 0.3);
  color: rgba(250, 249, 245, 0.78);
}

.hero-credit {
  right: max(24px, calc((100vw - 1540px) / 2));
  bottom: 16px;
}

.museum-section,
.method-section {
  width: min(1480px, calc(100% - 56px));
  padding: clamp(54px, 5vw, 78px) 0;
  grid-template-columns: 56px minmax(0, 1.12fr) minmax(280px, 0.58fr);
  gap: clamp(24px, 4vw, 62px);
}

.museum-copy h2,
.method-section h2 {
  font-size: clamp(34px, 3.3vw, 52px);
}

.museum-columns {
  gap: 28px;
}

.museum-columns p,
.method-steps p,
.method-note p {
  font-size: 14px;
  line-height: 1.75;
}

.museum-stats div {
  grid-template-columns: 74px 1fr;
  padding: 16px 0;
}

.museum-stats dt {
  font-size: 34px;
}

.theme-section {
  padding: clamp(54px, 5.5vw, 82px) max(28px, calc((100vw - 1480px) / 2));
}

.theme-heading {
  grid-template-columns: minmax(300px, 0.8fr) minmax(360px, 1.2fr);
  gap: 48px;
  margin-bottom: 28px;
}

.theme-heading h2 {
  font-size: clamp(34px, 3.4vw, 52px);
}

.theme-intro {
  font-size: 13px;
  line-height: 1.7;
}

@media (min-width: 821px) {
  .theme-heading {
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    gap: clamp(24px, 3vw, 48px);
  }

  .theme-heading > div,
  .theme-intro {
    min-width: 0;
  }

  .theme-heading h2 {
    max-width: 100%;
    line-height: 1.06;
    white-space: normal;
  }

  .theme-intro {
    width: 100%;
    max-width: 100%;
    margin: 0;
    align-self: end;
  }
}

@media (min-width: 1200px) {
  .theme-heading {
    grid-template-columns: minmax(0, 1fr) minmax(560px, 680px);
    gap: clamp(36px, 4vw, 72px);
  }

  .theme-intro {
    max-width: 680px;
    justify-self: end;
  }
}

.theme-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  grid-auto-rows: 176px;
  gap: 10px;
}

.theme-card-stele,
.theme-card-inscription,
.theme-card-epitaph,
.theme-card-objects,
.theme-card-special {
  grid-column: span 1;
  grid-row: span 1;
  min-height: 0;
}

.theme-card-copy {
  right: 16px;
  bottom: 16px;
  left: 16px;
  gap: 4px;
}

.theme-card-copy strong {
  font-size: clamp(24px, 2.4vw, 36px);
  line-height: 1;
}

.theme-card-copy > span {
  font-size: 11px;
  line-height: 1.35;
}

.theme-card-note {
  top: 9px;
  right: 9px;
  padding: 3px 5px;
  font-size: 7px;
}

.theme-card::after {
  right: 12px;
  bottom: 10px;
}

.catalog-section {
  padding: clamp(58px, 6vw, 92px) max(28px, calc((100vw - 1540px) / 2));
}

.catalog-heading {
  grid-template-columns: minmax(280px, 0.78fr) minmax(360px, 1.22fr);
  gap: 48px;
  margin-bottom: 30px;
}

.catalog-heading h2 {
  font-size: clamp(36px, 4vw, 58px);
}

.catalog-intro {
  max-width: 680px;
  font-size: 14px;
  line-height: 1.75;
}

.catalog-controls {
  margin-bottom: 24px;
  padding: 12px 0 14px;
}

.search-field {
  max-width: none;
  padding-bottom: 10px;
}

.search-field input {
  font-size: 15px;
}

.category-tabs {
  margin: 12px 0 10px;
}

.category-button,
.quiet-button,
.music-filter-button,
.control-row select {
  min-height: 36px;
  padding-block: 6px;
}

.catalog-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.artifact-card {
  min-width: 0;
  min-height: 172px;
  contain-intrinsic-size: 420px 172px;
  transition: transform 180ms ease, filter 180ms ease;
}

.artifact-card:hover {
  z-index: 2;
  transform: translate3d(0, -2px, 0);
  filter: brightness(1.035);
}

.artifact-card-button {
  position: relative;
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  width: 100%;
  height: 100%;
  min-height: 172px;
  overflow: hidden;
  border: 1px solid rgba(250, 249, 245, 0.14);
  background: #1c1c19;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.artifact-card-button > .card-image-wrap {
  min-height: 172px;
  width: 112px;
}

.card-corner-effect {
  position: absolute;
  z-index: 1;
  top: 0;
  right: 0;
  width: 92px;
  height: 92px;
  overflow: hidden;
  border-left: 1px solid rgba(234, 215, 166, 0.22);
  border-bottom: 1px solid rgba(234, 215, 166, 0.22);
  background: radial-gradient(circle at 70% 22%, rgba(215, 126, 105, 0.28), transparent 46%), rgba(29, 27, 21, 0.56);
  pointer-events: none;
}

.corner-orbit,
.corner-core {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.corner-orbit {
  border: 1px solid rgba(234, 215, 166, 0.6);
  animation: cornerSpin 8s linear infinite;
}

.orbit-a {
  width: 42px;
  height: 18px;
}

.orbit-b {
  width: 56px;
  height: 30px;
  transform: translate(-50%, -50%) rotate(55deg);
  border-color: rgba(215, 126, 105, 0.62);
  animation-duration: 11s;
  animation-direction: reverse;
}

.corner-core {
  width: 9px;
  height: 9px;
  background: #e7c98b;
  box-shadow: 0 0 18px rgba(231, 201, 139, 0.9);
}

@keyframes cornerSpin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.artifact-card-button:hover,
.artifact-card-button:focus-visible {
  border-color: rgba(215, 126, 105, 0.58);
  background: #20201c;
  outline: none;
}

.card-copy {
  display: grid;
  min-width: 0;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  padding: 13px 14px 12px;
}

.card-copy::before {
  content: "";
  position: absolute;
  inset: auto 14px auto auto;
  width: 0;
  height: 0;
}

.card-copy h3 {
  min-height: 0;
  margin: 0;
  overflow: hidden;
  font-size: clamp(16px, 1.32vw, 20px);
  line-height: 1.26;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-box-orient: vertical;
}

.card-period {
  min-height: 0;
  margin: 6px 0 0;
  color: rgba(250, 249, 245, 0.56);
  font-size: 12px;
  line-height: 1.5;
}

.card-excerpt {
  min-height: 0;
  margin-top: 8px;
  padding: 0;
  border: 0;
}

.card-excerpt-label {
  display: block;
  margin-bottom: 4px;
  color: rgba(250, 249, 245, 0.42);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.card-excerpt p {
  margin: 0;
  overflow: hidden;
  color: #f4eee7;
  font-size: 12px;
  line-height: 1.58;
  display: -webkit-box;
  -webkit-box-orient: vertical;
}

.card-footer {
  display: flex;
  min-height: 18px;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
}

.card-photo-count,
.card-enter {
  color: rgba(250, 249, 245, 0.48);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.card-flags {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  flex-wrap: wrap;
}

.special-marker,
.music-marker {
  position: static;
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 9px;
}

.special-marker {
  background: rgba(166, 50, 39, 0.9);
  color: #fff;
}

.music-marker {
  background: rgba(242, 210, 119, 0.14);
  border: 1px solid rgba(242, 210, 119, 0.4);
  color: #f0d999;
}

.card-number {
  position: static;
  color: rgba(250, 249, 245, 0.36);
  font-size: 9px;
  text-shadow: none;
}

.card-copy {
  display: grid;
  min-width: 0;
  align-content: center;
  justify-content: center;
  justify-items: center;
  text-align: center;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  padding: 13px 14px 12px;
  line-height: 1.25;
}

.card-meta {
  justify-content: center;
  gap: 9px;
  margin-bottom: 6px;
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-number {
  position: static;
  color: rgba(250, 249, 245, 0.36);
  font-size: 9px;
  text-shadow: none;
}

.card-number::after {
  margin-left: 8px;
  color: rgba(250, 249, 245, 0.18);
  content: "/";
}

.card-copy h3 {
  min-height: 0;
  margin: 0;
  overflow: hidden;
  font-size: clamp(15px, 1.2vw, 19px);
  line-height: 1.12;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-period {
  min-height: 0;
  margin: 5px 0 0;
  overflow: hidden;
  color: rgba(250, 249, 245, 0.5);
  font-size: 10px;
  line-height: 1.4;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-excerpt {
  min-height: 0;
  margin-top: 9px;
  padding-top: 8px;
  overflow: hidden;
  border-top: 1px solid rgba(250, 249, 245, 0.11);
}

.card-excerpt-label {
  display: block;
  margin-bottom: 3px;
  color: #d77e69;
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.card-excerpt p {
  margin: 0;
  overflow: hidden;
  color: rgba(250, 249, 245, 0.68);
  font-family: var(--serif);
  font-size: 11px;
  line-height: 1.55;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.card-footer {
  display: flex;
  min-height: 18px;
  align-items: center;
  gap: 7px;
  margin-top: 7px;
  color: rgba(250, 249, 245, 0.38);
  font-size: 8px;
  letter-spacing: 0.05em;
}

.card-flags {
  display: flex;
  min-width: 0;
  gap: 4px;
}

.special-marker,
.music-marker {
  position: static;
  padding: 2px 4px;
  border: 1px solid rgba(215, 126, 105, 0.36);
  background: rgba(159, 52, 40, 0.12);
  color: #dca08f;
  font-size: 7px;
  letter-spacing: 0.04em;
  backdrop-filter: none;
}

.music-marker {
  border-color: rgba(212, 177, 102, 0.42);
  background: rgba(212, 177, 102, 0.08);
  color: #dec781;
}

.card-enter {
  margin-left: auto;
  color: rgba(250, 249, 245, 0.52);
}

.artifact-card.special .card-image-wrap {
  outline-width: 1px;
}

.js-motion .reveal-item {
  transform: translate3d(0, 10px, 0);
  transition-duration: 340ms;
}

.artifact-dialog {
  width: min(1460px, calc(100vw - 28px));
  max-height: calc(100svh - 24px);
}

.detail-shell {
  display: grid;
  min-height: 80vh;
  grid-template-columns: minmax(430px, 0.9fr) minmax(500px, 1.1fr);
  align-items: start;
}

.detail-header,
.source-section,
.detail-footer {
  grid-column: 1 / -1;
}

.detail-header {
  padding: 26px 32px;
}

.detail-header h2 {
  font-size: clamp(30px, 3.5vw, 48px);
}

.detail-gallery {
  position: sticky;
  top: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  align-self: start;
  padding: 22px;
}

.main-image-button {
  min-height: 0;
}

.main-image-button,
.main-image-button img {
  height: min(58vh, 640px);
}

.photo-thumbs {
  max-height: none;
  flex-direction: row;
  gap: 7px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 3px;
}

.photo-thumb {
  width: 82px;
  aspect-ratio: 4 / 3;
}

.detail-body {
  grid-template-columns: 1fr;
  gap: 30px;
  padding: 30px 36px 48px;
}

.fact-panel {
  display: grid;
  grid-template-columns: 1fr;
}

.fact-panel dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 22px;
}

.fact-panel dl div {
  grid-template-columns: 72px 1fr;
  padding: 10px 0;
}

.research-copy {
  gap: 30px;
}

.research-copy section {
  padding-left: 42px;
}

.research-copy h3,
.source-section h3 {
  margin-bottom: 9px;
  font-size: 24px;
}

.research-copy section > p:last-child,
.music-research > #musicSummary {
  font-size: 15px;
  line-height: 1.82;
}

.research-copy .music-research {
  margin-left: 0;
  padding: 26px 28px 26px 64px;
}

.source-section {
  padding: 42px clamp(28px, 5vw, 72px);
}

.source-item {
  min-height: 116px;
}

.is-embedded .top-nav {
  display: none;
}

.is-embedded .hero {
  height: clamp(400px, 52svh, 520px);
  min-height: 400px;
}

.is-embedded .hero-museum-name {
  top: 26px;
}

.is-embedded .hero-panel {
  bottom: 28px;
}

.is-embedded .hero-credit {
  display: none;
}

@media (min-width: 1540px) {
  .catalog-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .artifact-card-button {
    grid-template-columns: 112px minmax(0, 1fr);
  }
}

@media (max-width: 1120px) {
  .theme-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .detail-shell {
    grid-template-columns: 1fr;
  }

  .detail-gallery,
  .detail-body {
    grid-column: 1;
  }

  .detail-gallery {
    position: static;
  }
}

@media (max-width: 820px) {
  .hero {
    height: 560px;
    min-height: 560px;
  }

  .top-nav {
    width: calc(100% - 24px);
  }

  .top-nav-links a:nth-child(2),
  .top-nav-links a:nth-child(3),
  .platform-return {
    display: none;
  }

  .hero-museum-name {
    top: 88px;
    right: 18px;
    left: 18px;
    align-items: flex-start;
    text-align: left;
  }

  .hero-panel {
    left: 16px;
    bottom: 26px;
    width: calc(100% - 32px);
  }

  .hero h1 {
    gap: clamp(22px, 8vw, 56px);
    font-size: clamp(52px, 15vw, 82px);
  }

  .museum-section,
  .method-section {
    width: calc(100% - 36px);
    padding: 54px 0;
  }

  .theme-section,
  .catalog-section {
    padding: 54px 18px;
  }

  .theme-heading,
  .catalog-heading {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .theme-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: 164px;
  }

  .theme-card-stele,
  .theme-card-inscription,
  .theme-card-epitaph,
  .theme-card-objects,
  .theme-card-special {
    grid-column: span 1;
    min-height: 0;
  }

  .catalog-grid {
    gap: 9px;
  }

  .artifact-card-button {
    min-height: 182px;
    grid-template-columns: 112px minmax(0, 1fr);
  }

  .card-image-wrap {
    min-height: 180px;
  }

  .detail-body {
    padding: 28px 22px 44px;
  }
}

@media (max-width: 620px) {
  .hero-museum-name strong {
    font-size: 25px;
    letter-spacing: 0.08em;
  }

  .hero-panel {
    padding: 24px 20px;
  }

  .hero h1 {
    gap: 18px;
    letter-spacing: 0.02em;
  }

  .hero-lead {
    font-size: 13px;
  }

  .theme-grid,
  .catalog-grid {
    grid-template-columns: 1fr;
  }

  .theme-grid {
    grid-auto-rows: 150px;
  }

  .artifact-card {
    min-height: 174px;
  }

  .artifact-card-button {
    min-height: 174px;
    grid-template-columns: 88px minmax(0, 1fr);
  }

  .card-image-wrap {
    min-height: 172px;
    aspect-ratio: auto;
  }

  .card-copy {
    padding: 11px 12px 10px;
    padding-right: 68px;
  }

  .card-excerpt p {
    -webkit-line-clamp: 3;
  }

  .control-row {
    gap: 7px;
  }

  .fact-panel dl {
    grid-template-columns: 1fr;
  }

  .main-image-button,
  .main-image-button img {
    height: 52vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  .top-nav-links a::after,
  .artifact-card,
  .artifact-card-button,
  .card-image-wrap img {
    transition: none !important;
  }
}
 @media (min-width: 721px) { .hero-panel h1 { font-size: clamp(72px, 5.5vw, 96px); } .hero-lead { max-width: 510px; font-size: 15px; } }
/* Themed method band — the archive-method section carries the site's
   cinnabar theme color with light contrast text (task: 栏目变色跟随主题色). */
.method-section {
  width: 100%;
  max-width: none;
  margin: 0;
  padding-inline: max(32px, calc((100% - 1440px) / 2));
  background:
    linear-gradient(165deg, rgba(166, 50, 39, 0.9) 0%, rgba(120, 37, 31, 0.94) 100%),
    var(--beilin-method-art) center / cover no-repeat;
}

.method-section .section-index {
  border-top-color: rgba(250, 249, 245, 0.55);
  color: rgba(250, 249, 245, 0.78);
}

.method-section h2 {
  color: var(--white);
}

.method-section .section-kicker {
  color: rgba(250, 249, 245, 0.85);
}

.method-section .method-steps {
  border-top-color: rgba(250, 249, 245, 0.5);
}

.method-section .method-steps li {
  border-bottom-color: rgba(250, 249, 245, 0.3);
}

.method-section .method-steps span {
  color: var(--paper);
}

.method-section .method-steps p {
  color: rgba(250, 249, 245, 0.92);
}

.method-section .method-note {
  color: rgba(250, 249, 245, 0.8);
}

.method-section .method-note strong {
  color: var(--white);
}

/* Card interior art: keep the image on the visible card and reading surfaces. */
.catalog-section {
  background:
    linear-gradient(110deg, rgba(23, 23, 20, .68), rgba(23, 23, 20, .44) 54%, rgba(23, 23, 20, .7)),
    var(--beilin-catalog-art) center / cover no-repeat;
}

.artifact-card-button,
.artifact-card-button:hover,
.artifact-card-button:focus-visible {
  background:
    linear-gradient(120deg, rgba(15, 15, 13, .58), rgba(15, 15, 13, .7)),
    var(--beilin-card-interior-art) center / cover no-repeat;
}

.artifact-card:nth-child(3n + 1) .artifact-card-button { background-position: center, 16% center; }
.artifact-card:nth-child(3n + 2) .artifact-card-button { background-position: center, 52% center; }
.artifact-card:nth-child(3n) .artifact-card-button { background-position: center, 84% center; }

.artifact-dialog {
  background:
    linear-gradient(135deg, rgba(240, 237, 229, .58), rgba(240, 237, 229, .68)),
    var(--beilin-card-interior-art) center / cover no-repeat;
}

.source-section {
  background:
    linear-gradient(135deg, rgba(228, 223, 211, .58), rgba(228, 223, 211, .7)),
    var(--beilin-card-interior-art) center / cover no-repeat;
}

.source-item {
  background:
    linear-gradient(135deg, rgba(250, 249, 245, .66), rgba(240, 237, 229, .76)),
    var(--beilin-card-interior-art) center / cover no-repeat;
}