/* 两套配色共用同一个布局，字体与间距也集中在这里调整。 */
:root {
  color-scheme: dark;
  --page: #111e21;
  --panel: #152427;
  --panel-hover: #1e3235;
  --text: #e9e3d5;
  --muted: #a2b0ab;
  --quiet: #839892;
  --line: #304245;
  --accent: #d2bc8b;
  --seal: #a95141;
  --selected: #263a38;
  --stage: #101b20;
  --font-body: "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-title: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --font-small: 12px;
  --font-body-size: 14px;
  --font-section: 19px;
  --radius: 3px;
}

:root[data-theme="paper"] {
  color-scheme: light;
  --page: #e4dcc6;
  --panel: #ece5d3;
  --panel-hover: #ded5bc;
  --text: #283d35;
  --muted: #576659;
  --quiet: #697465;
  --line: #c9c4aa;
  --accent: #516548;
  --seal: #963f35;
  --selected: #dbdfca;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; background: var(--page); color: var(--text); font: var(--font-body-size)/1.8 var(--font-body); }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; color: inherit; cursor: pointer; }
button, a { touch-action: manipulation; }
button { border: 0; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
img { display: block; max-width: 100%; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.skip-link { position: fixed; z-index: 10; top: 8px; left: 8px; padding: 8px 20px; background: var(--panel); transform: translateY(-150%); }
.skip-link:focus-visible { transform: translateY(0); }
.load-status { padding: 20vh 24px; color: var(--muted); text-align: center; }
.site-header { max-width: 1536px; min-height: 104px; margin: auto; padding: 24px 48px; display: flex; align-items: center; gap: 44px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 15px; }
.brand-seal { width: 37px; height: 43px; border: 1px solid var(--seal); color: #dfb5a2; background: var(--seal); font: 27px/41px var(--font-title); text-align: center; }
.brand strong { display: block; font: 27px/1.3 var(--font-title); letter-spacing: 5px; font-weight: 500; }
.brand small { display: block; margin-top: 5px; font-size: 10px; color: var(--quiet); letter-spacing: 3px; }
.header-nav { display: flex; align-items: center; gap: 34px; margin-left: auto; font-family: var(--font-title); font-size: 15px; letter-spacing: 3px; }
.header-nav a { padding: 8px 0; }
.header-nav a:hover { color: var(--accent); }
.theme-switch { display: flex; padding: 3px; border: 1px solid var(--line); border-radius: var(--radius); }
.theme-switch button { min-height: 32px; padding: 2px 12px; background: transparent; color: var(--muted); font-size: 12px; }
.theme-switch button[aria-pressed="true"] { background: var(--selected); color: var(--text); }
.museum-layout { max-width: 1536px; margin: auto; padding: 32px 48px 0; display: grid; grid-template-columns: 224px minmax(0, 1fr); gap: 36px; align-items: start; }
.catalog { padding: 2px 0 32px; }
.section-heading, .pattern-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 18px; }
.section-heading h2, .pattern-heading h2 { font: 15px/1.5 var(--font-title); letter-spacing: 2px; }
.section-heading span, .pattern-heading span { font-size: 10px; color: var(--quiet); }
.umbrella-list { margin-bottom: 32px; display: grid; gap: 3px; }
.umbrella-card { width: 100%; display: flex; gap: 12px; align-items: center; padding: 10px 10px; background: transparent; border-left: 2px solid transparent; text-align: left; }
.umbrella-card[aria-current="true"] { background: var(--selected); border-left-color: var(--accent); }
.umbrella-card:hover { background: var(--panel-hover); }
.umbrella-card img { width: 48px; height: 54px; object-fit: cover; object-position: 82% center; }
.umbrella-card strong { display: block; font: 17px/1.7 var(--font-title); letter-spacing: 2px; font-weight: 400; }
.umbrella-card small { display: block; font-size: 11px; color: var(--muted); }
.umbrella-card .catalog-dot { margin-left: auto; height: 5px; width: 5px; background: var(--accent); border-radius: 50%; visibility: hidden; }
.umbrella-card[aria-current="true"] .catalog-dot { visibility: visible; }
.pattern-heading { margin-bottom: 16px; }
.pattern-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 12px; }
.pattern-button { display: flex; flex-direction: column; align-items: center; gap: 6px; background: transparent; padding: 8px 4px 5px; border: 1px solid transparent; border-radius: var(--radius); color: var(--muted); }
.pattern-button:hover { background: var(--panel-hover); color: var(--text); }
.pattern-button[aria-pressed="true"] { background: var(--selected); border-color: var(--line); color: var(--accent); }
.pattern-button img { width: 62px; height: 62px; object-fit: contain; border-radius: 50%; }
.pattern-button span { font-size: 11px; letter-spacing: 2px; }
.catalog-note { margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 11px; line-height: 2.2; letter-spacing: 1px; color: var(--quiet); }
.catalog-footer { display: flex; align-items: center; gap: 8px; margin-top: 36px; font-size: 10px; color: var(--quiet); letter-spacing: 1px; }
.tiny-line { width: 18px; height: 1px; background: var(--quiet); }
.exhibition { min-width: 0; }
.mobile-catalog { display: none; }
.pattern-control { width: 144px; padding: 4px 9px; background: #13262be0; border: 1px solid #69817c55; border-radius: 2px; color: #d8d6c5; }
.pattern-control span { font-size: 10px; line-height: 1.4; display: block; }
.pattern-control select { width: 100%; border: 0; background: #13262b; color: #e6dcc6; font: 11px/1.5 var(--font-body); min-height: 23px; }
.stage-control-body { flex-wrap: wrap; }
.stage-control-body select:disabled { opacity: .5; }
.craft-step p { margin-top: 10px; color: var(--muted); font-size: 12px; line-height: 2; }
.heritage-note, .meaning-note { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 18px; }
.heritage-note > strong { display: block; font: 15px/1.8 var(--font-title); font-weight: 400; letter-spacing: 2px; margin-bottom: 8px; }
.heritage-note p, .meaning-note p { font-size: 13px; color: var(--muted); line-height: 2; max-width: 750px; }
.source-link { display: inline-block; font-size: 11px; margin-top: 8px; color: var(--accent); border-bottom: 1px solid var(--line); line-height: 1.9; }
.source-link:hover { border-color: var(--accent); }
.source-details { margin-top: 18px; }
.source-details summary { font-size: 12px; cursor: pointer; color: var(--muted); }
.source-details h4 { margin: 14px 0 8px; font-size: 13px; font-weight: 500; }
.meaning-label { display: block; margin-bottom: 6px; font-size: 11px; color: var(--accent); letter-spacing: 2px; }

/* 扩展到八把伞后，目录保持紧凑，纹样试配采用四列。 */
@media (min-width: 761px) {
  .umbrella-card { gap: 9px; padding: 8px; }
  .umbrella-card img { width: 34px; height: 34px; object-fit: contain; }
  .umbrella-card strong { font-size: 15px; letter-spacing: 1px; line-height: 1.6; }
  .umbrella-card small { font-size: 10px; line-height: 1.5; }
  .pattern-list { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px 3px; }
  .pattern-button { gap: 5px; padding: 6px 2px 4px; }
  .pattern-button img { width: 37px; height: 37px; }
  .pattern-button span { font-size: 10px; letter-spacing: 0; }
  .catalog-note { margin-top: 20px; padding-top: 16px; }
  .catalog-footer { margin-top: 24px; }
}
@media (max-width: 760px) {
  .mobile-catalog { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 15px; font-size: 12px; color: var(--muted); }
  .mobile-catalog select { min-width: 0; max-width: 72%; padding: 8px 24px 8px 10px; font: 12px var(--font-body); color: var(--text); border: 1px solid var(--line); background: var(--panel); border-radius: 2px; }
  .pattern-control { width: 100%; display: flex; align-items: center; gap: 12px; padding: 6px 10px; }
  .pattern-control select { font-size: 12px; min-height: 28px; }
  .stage-control-body { background: #13262bf0; padding: 8px; border: 1px solid #69817c55; }
  .stage-control-body button { flex: 1; }
  .viewer.is-expanded { inset: 8px; max-height: none; }
  .craft-step p { font-size: 12px; }
  .heritage-note p, .meaning-note p { font-size: 13px; }
}
.viewer { position: relative; isolation: isolate; container-type: inline-size; overflow: hidden; height: clamp(390px, 38vw, 570px); min-height: 390px; background: var(--stage); border-radius: var(--radius); color: #ede5d3; }
.three-host { position: absolute; inset: 0; background: #112329; }
.three-host::before { content: ""; position: absolute; inset: 0; background: url("../assets/misc/hall-bg.png") center/cover; opacity: .12; filter: blur(5px); pointer-events: none; }
.three-host canvas { display: block; position: relative; width: 100%; height: 100%; touch-action: none; }
.three-host canvas:focus-visible { outline: 2px solid #d2bc8b; outline-offset: -4px; }
.stage-message { position: absolute; inset: 40% 15% auto; padding: 12px 16px; font-size: 12px; background: #102024e8; border: 1px solid #69817c55; color: #ddd5c3; text-align: center; }
.stage-message button { display: block; padding: 8px 18px; margin: 8px auto 0; background: #34463e; color: #ede5d3; }
.stage-controls { position: absolute; bottom: 86px; left: 28px; right: 28px; pointer-events: none; }
.stage-controls summary { display: block; pointer-events: auto; cursor: pointer; width: fit-content; margin-left: auto; padding: 3px 9px; color: #d8d6c5; background: #13262be0; font-size: 11px; }
.stage-controls[open] summary { display: none; }
.stage-control-body { display: flex; align-items: center; gap: 8px; justify-content: flex-end; }
.stage-control-body > * { pointer-events: auto; }
.stage-control-body button { min-height: 38px; padding: 6px 11px; background: #13262be0; border: 1px solid #69817c55; color: #d8d6c5; font-size: 11px; border-radius: 2px; }
.stage-control-body button[aria-pressed="true"] { color: #edd7a7; border-color: #a7996f; }
.stage-control-body button:disabled { opacity: .5; cursor: wait; }
.open-control { width: 164px; padding: 6px 12px; background: #13262be0; border: 1px solid #69817c55; border-radius: 2px; }
.open-control span { display: flex; justify-content: space-between; font-size: 10px; line-height: 1.5; color: #d8d6c5; }
.open-control input { width: 100%; accent-color: #d2bc8b; display: block; margin: 5px 0 0; height: 14px; cursor: pointer; }
.viewer.is-expanded { position: fixed; inset: 16px; z-index: 50; height: auto; min-height: 0; border: 1px solid #69817c; }
.viewer-expanded { overflow: hidden; }
.reference-image { position: absolute; inset: 0; height: 100%; width: 100%; object-fit: cover; object-position: center; }
.viewer-copy { position: absolute; left: 36px; top: 34px; max-width: 240px; pointer-events: none; }
.eyebrow { display: block; font-size: 10px; letter-spacing: 5px; color: #abb7b1; margin-bottom: 20px; }
.viewer h1 { font: 31px/1.6 var(--font-title); font-weight: 400; letter-spacing: 4px; max-width: 240px; white-space: pre-line; }
.viewer-copy p { margin-top: 15px; font-size: 11px; letter-spacing: 1px; color: #afbbb3; }
.viewer-type { position: absolute; top: 28px; right: 28px; padding: 3px 9px; color: #c9c9b6; background: #10202499; font-size: 10px; border: 1px solid #8e9e9840; border-radius: 2px; }
.viewer-toolbar { position: absolute; left: 28px; right: 28px; bottom: 24px; display: flex; align-items: center; justify-content: space-between; gap: 12px; pointer-events: none; }
.viewer-toolbar > * { pointer-events: auto; }
.view-switch { display: flex; padding: 4px; background: #102024d9; border: 1px solid #69817c55; backdrop-filter: blur(8px); border-radius: var(--radius); }
.view-switch button { padding: 6px 14px; min-height: 36px; font-size: 11px; letter-spacing: 1px; color: #b1bdb7; background: transparent; border-radius: 2px; }
.view-switch button[aria-pressed="true"] { background: #34463e; color: #e5dcc5; }
.enlarge-button { background: #122024ad; padding: 9px 12px; font-size: 11px; color: #d4d9cc; min-height: 42px; border: 1px solid #69817c55; border-radius: 2px; }
.enlarge-button span { margin-left: 10px; }
.enlarge-button:hover { background: #34463e; }
.viewer-caption { display: flex; justify-content: space-between; gap: 12px; margin: 12px 0 28px; font-size: 10px; color: var(--quiet); letter-spacing: 1px; }
.pattern-view { display: grid; place-items: center; position: absolute; inset: 0; background: #142528; }
.pattern-view img { height: 80%; width: 80%; max-height: 420px; object-fit: contain; filter: drop-shadow(0 12px 20px #0005); }
.viewer.is-pattern .viewer-copy { top: 24px; left: 28px; }
.viewer.is-pattern .viewer-copy h1 { font-size: 19px; letter-spacing: 2px; max-width: none; }
.viewer.is-pattern .viewer-copy p, .viewer.is-pattern .eyebrow { display: none; }
.culture { border-top: 1px solid var(--line); }
.culture-bar { display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.culture-bar h2 { font: var(--font-section)/1.6 var(--font-title); letter-spacing: 3px; font-weight: 400; }
.culture-tabs { display: flex; gap: 30px; }
.culture-tabs button { position: relative; padding: 18px 2px 16px; background: transparent; color: var(--muted); font-size: 13px; letter-spacing: 2px; }
.culture-tabs button[aria-selected="true"] { color: var(--accent); }
.culture-tabs button[aria-selected="true"]::after { content: ""; height: 2px; background: var(--accent); position: absolute; bottom: -1px; left: 0; right: 2px; }
.culture-panel { min-height: 220px; padding: 26px 0 24px; }
.panel-intro { display: flex; justify-content: space-between; gap: 16px; align-items: baseline; margin-bottom: 25px; }
.panel-intro h3 { font: 18px/1.6 var(--font-title); font-weight: 400; letter-spacing: 2px; }
.panel-intro p { font-size: 12px; color: var(--muted); }
.structure-items { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.structure-item { padding-right: 20px; border-right: 1px solid var(--line); }
.structure-item:last-child { border-right: 0; padding-right: 0; }
.structure-item h4 { font: 15px/1.5 var(--font-title); font-weight: 400; letter-spacing: 3px; margin: 0 0 10px; color: var(--accent); }
.structure-item p { color: var(--muted); font-size: 14px; line-height: 2; }
.craft-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.craft-step { margin: 0; }
.craft-step img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 2px; }
.craft-step figcaption { font: 15px/1.8 var(--font-title); margin-top: 8px; letter-spacing: 2px; }
.content-note { margin-top: 22px; font-size: 11px; line-height: 1.9; color: var(--quiet); }
.pattern-detail { display: flex; align-items: center; gap: 28px; }
.pattern-detail img { width: 94px; height: 94px; object-fit: contain; }
.pattern-detail h4 { margin: 0 0 4px; font: 17px/1.7 var(--font-title); letter-spacing: 2px; }
.pattern-detail small { color: var(--accent); font-size: 11px; letter-spacing: 2px; }
.pattern-detail p { margin-top: 9px; max-width: 540px; font-size: 14px; color: var(--muted); }
.site-footer { max-width: 1536px; margin: 0 auto; padding: 24px 48px 30px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 28px; color: var(--quiet); font-size: 10px; }
dialog { width: min(1100px, 92vw); max-height: 92dvh; background: var(--panel); color: var(--text); padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); }
dialog::backdrop { background: #071014df; backdrop-filter: blur(5px); }
.dialog-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.dialog-heading h2 { font: 18px/1.7 var(--font-title); }
.dialog-heading button { min-height: 40px; padding: 6px 12px; background: var(--selected); border-radius: 2px; }
dialog img { width: 100%; max-height: 75dvh; object-fit: contain; }

@media (min-width: 1600px) {
  .museum-layout { grid-template-columns: 240px minmax(0, 1fr); gap: 44px; }
  .pattern-button img { width: 72px; height: 72px; }
}
@media (max-width: 1100px) {
  .site-header { padding: 22px 28px; }
  .museum-layout { padding: 26px 28px 0; grid-template-columns: 180px minmax(0, 1fr); gap: 24px; }
  .viewer-copy { left: 26px; }
  .viewer h1 { font-size: 26px; max-width: 180px; }
  .viewer-caption { letter-spacing: 0; }
  .panel-intro { display: block; }
  .panel-intro p { margin-top: 6px; }
  .site-footer { padding-left: 28px; padding-right: 28px; flex-direction: column; gap: 4px; }
}
@media (max-width: 760px) {
  .site-header { padding: 18px 20px; min-height: 86px; gap: 14px; }
  .brand { gap: 10px; }
  .brand-seal { width: 29px; height: 36px; font-size: 22px; line-height: 34px; }
  .brand strong { font-size: 21px; letter-spacing: 3px; }
  .brand small { font-size: 9px; letter-spacing: 1px; }
  .header-nav { display: none; }
  .theme-switch { margin-left: auto; }
  .theme-switch button { padding: 3px 8px; min-height: 36px; font-size: 11px; }
  .museum-layout { padding: 20px 20px 0; grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .catalog { grid-row: 2; padding: 0 0 28px; border-top: 1px solid var(--line); }
  .section-heading { margin: 22px 0 14px; }
  .umbrella-list { margin-bottom: 24px; }
  .umbrella-card { padding: 12px; }
  .umbrella-card img { width: 40px; height: 42px; }
  .pattern-list { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px 6px; }
  .pattern-button img { width: 54px; height: 54px; }
  .pattern-button span { letter-spacing: 0; }
  .catalog-note, .catalog-footer { display: none; }
  .viewer { height: 49svh; min-height: 350px; max-height: 530px; }
  .reference-image { object-position: 68% center; opacity: .9; }
  .viewer-copy { top: 23px; left: 22px; max-width: 250px; }
  .eyebrow { font-size: 9px; letter-spacing: 3px; margin-bottom: 10px; }
  .viewer h1 { font-size: 16px; max-width: 245px; line-height: 1.6; letter-spacing: 1px; white-space: normal; }
  .viewer-copy p, .viewer-copy .eyebrow { display: none; }
  .viewer-type { top: 16px; right: 16px; font-size: 9px; }
  .viewer-toolbar { bottom: 17px; left: 16px; right: 16px; gap: 6px; }
  .stage-controls { bottom: 76px; left: 16px; right: 16px; }
  .stage-controls summary { display: block; pointer-events: auto; margin-left: auto; width: fit-content; background: #13262be0; border: 1px solid #69817c55; color: #d8d6c5; padding: 5px 10px; font-size: 11px; }
  .stage-controls[open] summary { margin-bottom: 7px; }
  .stage-controls[open] summary { display: block; }
  .stage-control-body { flex-wrap: wrap; justify-content: flex-end; gap: 5px; }
  .stage-control-body button { min-height: 36px; font-size: 10px; padding: 6px 9px; }
  .open-control { width: 100%; }
  .stage-message { inset: 36% 5% auto; }
  .view-switch button { padding: 5px 9px; min-height: 36px; font-size: 10px; }
  .enlarge-button { padding: 7px 9px; font-size: 10px; }
  .enlarge-button span { margin-left: 3px; }
  .viewer-caption { font-size: 9px; margin-bottom: 20px; }
  .culture-bar { gap: 12px; }
  .culture-bar h2 { font-size: 17px; letter-spacing: 2px; }
  .culture-tabs { gap: 18px; }
  .culture-tabs button { padding: 16px 0 14px; font-size: 12px; }
  .culture-panel { padding-top: 22px; }
  .panel-intro h3 { font-size: 17px; }
  .panel-intro { margin-bottom: 20px; }
  .panel-intro p { font-size: 11px; }
  .structure-items { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .structure-item { display: grid; grid-template-columns: 80px minmax(0, 1fr); gap: 14px; border-right: 0; padding: 0; }
  .structure-item h4 { margin: 0; font-size: 13px; letter-spacing: 1px; }
  .structure-item p { font-size: 13px; }
  .craft-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .pattern-detail { gap: 16px; align-items: flex-start; }
  .pattern-detail img { width: 76px; height: 76px; }
  .pattern-detail h4 { font-size: 16px; }
  .pattern-detail p { font-size: 13px; }
  .site-footer { padding: 20px; font-size: 10px; }
  dialog { padding: 14px; }
}
@media (min-width: 1300px) {
  .stage-controls { bottom: 24px; left: 215px; right: 140px; }
  .stage-control-body { justify-content: flex-end; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
@container (max-width: 760px) {
  .viewer-copy { top: 23px; left: 22px; max-width: 250px; }
  .viewer-copy h1 { font-size: 16px; max-width: 245px; line-height: 1.6; letter-spacing: 1px; white-space: normal; }
  .viewer-copy .eyebrow, .viewer-copy p { display: none; }
}
#three-host { transition: opacity 140ms ease; }
#three-host.is-changing { opacity: .35; }
@media (prefers-reduced-motion: reduce) {
  #three-host { transition: none; }
}