@font-face{font-family:'Museum WenKai';src:url('/assets/museum/r210/fonts/wenkai-ui.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Museum Zhuque';src:url('/assets/museum/r210/fonts/zhuque-complete-r213.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Museum Text';src:url('/assets/museum/fonts/museum-serif-400-r213.woff2') format('woff2');font-weight:400;font-display:swap}
body.student-page.museum-refined{
  --ink:#171816;--fg:#e7e1d4;--accent:#bba06d;--muted:#b3aa96;--line:#b59a6538;
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  --panel-bg:var(--ink);--surface:var(--ink);--text:var(--fg);--text-muted:var(--muted);
  --theme-page:var(--ink);--theme-surface:var(--ink);--theme-text:var(--fg);--theme-accent:var(--accent);--theme-muted:var(--muted);
  --forest-paper:var(--ink);--forest-ink:var(--fg);--forest-card:var(--ink);--forest-gold:var(--accent);
  margin:0;color:var(--fg)!important;background-color:var(--ink)!important;
  background-image:var(--museum-era-scene,none),url('/assets/museum/r210/charcoal-fibre.png')!important;
  background-position:center top,center top!important;background-repeat:no-repeat,repeat!important;
  background-size:min(100%,1024px) auto,627px 627px!important;background-blend-mode:normal,luminosity;font-family:var(--font-body);font-size:15px;line-height:1.65;min-height:100svh;
}
body.museum-refined *{box-sizing:border-box}
body.museum-refined .hidden,body.museum-refined [hidden]{display:none!important}
body.student-page.museum-refined .app-shell{width:100%!important;max-width:1024px!important;margin:0 auto!important;padding:0!important;background:transparent!important;border:0!important;border-radius:0!important;box-shadow:none!important;backdrop-filter:none!important;-webkit-backdrop-filter:none!important}
body.museum-refined .app-shell>.topbar,body.museum-refined .student-sidebar,body.museum-design-preview #installBanner{display:none!important}
body.student-page.museum-refined .student-workspace,body.student-page.museum-refined .main-column{display:block;width:100%!important;max-width:none!important;margin:0!important;padding:0!important;min-width:0;background:transparent;border:0;box-shadow:none}
body.museum-refined .main-column>.panel{display:none!important}
body.museum-refined .main-column>.panel.active-mobile-panel{display:block!important;width:100%;max-width:none;margin:0;border:0;border-radius:0;box-shadow:none;background:transparent;padding:24px 24px calc(98px + env(safe-area-inset-bottom))}
body.student-page.museum-refined.mr-cover-visible #knowledgeStudyPanel{border-radius:0!important;backdrop-filter:none!important;-webkit-backdrop-filter:none!important}
body.student-page.museum-refined.mr-cover-visible #knowledgeStudyPanel::before{display:none!important}
body.museum-refined h1,body.museum-refined h2,body.museum-refined h3{font-family:var(--font-display);font-weight:400;color:var(--fg);letter-spacing:.06em;line-height:1.45}
body.museum-refined p{color:var(--muted)}
body.museum-refined button,body.museum-refined input,body.museum-refined select,body.museum-refined textarea{font:inherit;color:var(--fg)}
body.museum-refined button{touch-action:manipulation;cursor:pointer;transition:background-color .12s,color .12s,transform .12s}
body.museum-refined button:disabled{cursor:default;opacity:.42}
body.museum-refined button:focus-visible,body.museum-refined [tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
body.museum-refined button:active:not(:disabled){transform:translateY(1px)}
body.museum-refined button.primary,body.museum-refined button.secondary{min-height:44px;border:1px solid var(--line);border-radius:5px;background:transparent;box-shadow:none;color:var(--accent)}
body.museum-refined input,body.museum-refined select,body.museum-refined textarea{background:var(--ink);border:1px solid var(--line);border-radius:4px}
body.museum-refined .mr-icon{display:inline-block;flex:0 0 24px;width:24px;height:24px;background-color:currentColor;mask-image:var(--icon);-webkit-mask-image:var(--icon);mask-size:contain;-webkit-mask-size:contain;mask-repeat:no-repeat;-webkit-mask-repeat:no-repeat;mask-position:center;-webkit-mask-position:center;vertical-align:middle}
body.museum-refined .mr-button{min-height:44px;padding:9px 16px;display:inline-flex;align-items:center;justify-content:center;gap:10px;color:var(--accent);border:1px solid var(--line);border-radius:5px;background:transparent;font-weight:400;box-shadow:none;line-height:1.4;text-decoration:none}
body.museum-refined .mr-button:hover{background:#bba06d10}
body.museum-refined .mr-button:active{background:#bba06d20}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock){position:fixed;inset:auto 0 0!important;z-index:65;display:grid!important;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;width:100%!important;max-width:1024px;height:calc(74px + env(safe-area-inset-bottom));margin:0 auto!important;padding:7px 12px calc(7px + env(safe-area-inset-bottom))!important;background:var(--ink) url('/assets/museum/r210/charcoal-fibre.png') repeat!important;background-blend-mode:luminosity;background-size:627px!important;border:0!important;border-top:1px solid var(--line)!important;border-radius:0!important;box-shadow:none!important;backdrop-filter:none!important}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) button{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:0;min-height:52px;padding:0 2px!important;background:none!important;border:0!important;border-radius:0!important;box-shadow:none!important;color:var(--muted)!important;font-family:var(--font-body)!important;font-size:12px!important;line-height:1.2}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) button strong{font:inherit}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock){transform:none!important;height:calc(74px + env(safe-area-inset-bottom))!important;gap:0!important}
body.student-page.museum-refined #mobileStudyNav:not(.knowledge-module-dock){max-width:1024px!important;grid-template-columns:repeat(5,minmax(0,1fr))!important;grid-auto-flow:row!important;overflow:visible!important}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) button{width:auto!important;height:auto!important;min-height:52px!important;font-weight:400!important}
body.museum-refined #profileAvatar img{width:100%;height:100%;object-fit:contain;padding:9px}
body.museum-refined #profileStatus:empty{display:none!important}
body.museum-design-preview #changeAvatarButton em{display:none}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) button.active{color:var(--accent)!important}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) button.active:after{content:'';position:absolute;bottom:-3px;width:24px;height:2px;background:var(--accent)}
body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) .mr-icon{width:25px;height:25px;flex-basis:25px}
body.museum-refined #mobileStudyNav.knowledge-module-dock{background:var(--ink)!important;border-top:1px solid var(--line);border-radius:0;box-shadow:none}
body.museum-refined #mobileStudyNav.knowledge-module-dock button{background:transparent!important;color:var(--accent)!important;border-radius:0}
body.museum-refined #knowledgeStudyPanel{position:relative}
body.museum-refined.mr-cover-visible #knowledgeStudyPanel>.panel-heading,
body.museum-refined.mr-cover-visible #knowledgeStudyPanel>.knowledge-refresh-row,
body.museum-refined.mr-cover-visible #knowledgeStudyPanel>.knowledge-keyword-search,
body.museum-refined.mr-cover-visible #knowledgeStudyPanel>.student-knowledge-layout,
body.museum-refined.mr-cover-visible #knowledgeStudyPanel>.knowledge-progress-card{display:none!important}
body.museum-design-preview #knowledgeStudyPanel>.panel-heading,
body.museum-design-preview #knowledgeStudyPanel>.knowledge-refresh-row,
body.museum-design-preview #knowledgeStudyPanel>.knowledge-keyword-search,
body.museum-design-preview #knowledgeStudyPanel>.student-knowledge-layout,
body.museum-design-preview #knowledgeStudyPanel>.knowledge-progress-card{display:none!important}
body.museum-refined .museum-course-masthead{display:block;padding:0 0 19px;margin:0;background:none;border:0;box-shadow:none;position:relative}
body.museum-refined .museum-course-masthead-top{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:25px}
body.museum-refined .museum-brand-lockup{display:flex;align-items:center;gap:5px;color:var(--accent);padding-top:3px;white-space:nowrap}
body.museum-refined .museum-brand-lockup img{height:27px;width:25px;object-fit:contain}
body.student-page.museum-refined .brand-mark{object-fit:contain!important;background:transparent!important;border:0!important;box-shadow:none!important}
body.museum-refined .museum-brand-lockup strong{font-family:var(--font-display);font-size:17px;font-weight:400;letter-spacing:.1em}
body.museum-refined .museum-masthead-shortcuts{display:flex;gap:18px;align-items:flex-start}
body.museum-refined .museum-masthead-shortcuts .mr-button{border:0;border-radius:0;padding:0;gap:5px;flex-direction:column;font-size:10px;min-height:43px;white-space:nowrap}
body.museum-refined #museumCourseTitle{font:400 36px/1.4 var(--font-display);letter-spacing:.09em;margin:0 0 14px;color:var(--fg);cursor:pointer}
body.museum-refined .museum-title-rule{position:relative;border-top:1px solid var(--line);width:100%;height:1px;margin:0 0 14px}
body.museum-refined .museum-title-rule:after{content:'';position:absolute;left:49%;top:-4px;width:8px;height:8px;border:solid var(--accent);border-width:0 1px 1px 0;background:var(--ink);transform:rotate(45deg)}
body.museum-refined .museum-chapter-toggle{border:0;background:none;padding:0;margin:0;display:flex;align-items:center;gap:12px;min-height:36px;color:var(--accent);font-size:16px;letter-spacing:.045em;text-align:left;max-width:100%;box-shadow:none}
body.museum-refined .museum-chapter-toggle .mr-icon{width:16px;height:16px;flex-basis:16px}
body.museum-refined .museum-week-progress{display:flex;align-items:center;gap:18px;color:var(--muted);font-size:12px;margin-top:10px;letter-spacing:.06em}
body.museum-refined .museum-week-progress progress{width:84px;height:3px;appearance:none;-webkit-appearance:none;background:#e7e1d41a;border:0;border-radius:1px;overflow:hidden}
body.museum-refined .mr-progress-segments{display:flex;gap:4px;width:128px;height:4px}
body.museum-refined .mr-progress-segments>span{position:relative;flex:1;overflow:hidden;border-radius:2px;background:#e7e1d41a}
body.museum-refined .mr-progress-segments>span:after{content:'';position:absolute;inset:0 auto 0 0;width:var(--segment-progress);background:var(--accent);border-radius:2px}
body.museum-refined progress::-webkit-progress-bar{background:#e7e1d41a}
body.museum-refined progress::-webkit-progress-value{background:var(--accent)}
body.museum-refined progress::-moz-progress-bar{background:var(--accent)}
body.museum-refined .mr-cover{display:grid;grid-template-columns:42px minmax(0,1fr);column-gap:10px;row-gap:17px;width:100%;max-width:100%;position:relative;padding:0;margin:0}
body.museum-refined .mr-timeline{grid-column:1;grid-row:1 / 4;position:relative;padding-top:14px;border-left:1px solid var(--line);margin-left:5px;display:flex;flex-direction:column;justify-content:space-between;padding-bottom:24px}
body.museum-refined .mr-era{position:relative;display:flex;flex-direction:column;gap:8px;border:0;padding:0 0 0 8px;margin:0;background:none;color:var(--accent);font:400 14px/1.4 var(--font-body);min-height:44px;text-align:left}
body.museum-refined .mr-era:before{content:'';width:6px;height:6px;position:absolute;left:-3.5px;top:7px;border:0;border-radius:50%;background:var(--muted);box-shadow:0 0 0 5px var(--ink),0 0 0 6px var(--muted)}
body.museum-refined .mr-era.current:before{background:var(--accent);box-shadow:0 0 0 6px var(--ink),0 0 0 7px var(--accent)}
body.museum-refined .mr-era img{width:27px;height:34px;object-fit:contain;opacity:.85}
body.museum-refined .mr-era.next{color:var(--muted);opacity:.65}
body.museum-refined .mr-archive{grid-column:2;position:relative;margin:0;min-width:0;aspect-ratio:3 / 4;display:flex;flex-direction:column;background:none;padding:26px 22px 24px 21px;color:#342d22;isolation:isolate}
body.museum-refined .mr-archive:before{content:'';position:absolute;inset:0;background:url('/assets/museum/r210/archival-paper.png') center / 100% 100% no-repeat;clip-path:inset(2.2% 2.8% 2.1% 2.6%);z-index:-1;pointer-events:none}
body.museum-refined[data-museum-era^='china-'] .mr-archive:before{background-image:url('/assets/museum/r211/archive-folio.png');clip-path:polygon(3.28% 3.30%,3.85% 2.31%,6.94% 1.85%,75.43% 1.85%,75.92% 1.25%,81.98% 1.19%,85.16% 1.52%,86.61% 2.11%,87.76% 3.23%,88.34% 5.21%,96.44% 5.21%,97.30% 5.74%,97.40% 6.73%,94.41% 94.26%,93.83% 94.85%,88.05% 94.85%,87.67% 95.98%,86.99% 96.57%,84.30% 96.83%,6.94% 96.83%,3.66% 96.57%,3.18% 95.45%)}
body.museum-refined[data-museum-era^='china-'] .mr-archive{padding-right:17%}
body.museum-design-preview[data-museum-era='china-prehistoric'] .mr-art>img{object-fit:cover;object-position:center 65%;mix-blend-mode:normal}
body.museum-refined .mr-era.previous{display:none}
body.museum-refined .mr-archive-copy small{display:block;font-size:11px;color:#655a46;letter-spacing:.06em}
body.museum-refined .mr-archive h3{font-size:23px;color:#342d22;line-height:1.35;letter-spacing:.04em;margin:5px 0 5px}
body.museum-refined .mr-archive p{font-size:11px;color:#655a46;margin:4px 0 0}
body.museum-refined .mr-art{flex:1;min-height:0;padding:0;border:0;margin:15px 0 12px;background:none;overflow:hidden;display:flex;align-items:center;justify-content:center}
body.museum-refined .mr-art>img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}
body.museum-refined .mr-art .protected-image-wrap{width:100%;height:100%}
body.museum-refined .mr-art .protected-image-wrap img{width:100%;height:100%;object-fit:contain}
body.museum-refined:not(.museum-design-preview) .mr-art>img{mix-blend-mode:normal}
body.museum-refined .mr-archive footer{border-top:1px solid #88775255;font-size:9px;display:flex;justify-content:space-between;gap:10px;padding-top:9px;color:#79694e}
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body.museum-refined .mr-study-links .mr-button{padding:4px 0;border:0;font-size:11px;flex:1;gap:5px;justify-content:flex-start;color:var(--muted)}
body.museum-refined .mr-study-links .mr-icon{width:18px;height:18px;flex-basis:18px}
body.museum-refined .mr-dialog{position:fixed;inset:0;width:min(560px,calc(100vw - 24px));max-height:calc(100svh - 38px);margin:auto;padding:22px 22px 18px;background:var(--ink) url('/assets/museum/r210/charcoal-fibre.png') repeat;background-blend-mode:luminosity;background-size:627px;color:var(--fg);border:1px solid var(--line);border-radius:5px;box-shadow:0 16px 60px #0008;overflow:auto}
body.museum-refined .mr-dialog::backdrop{background:#0009;backdrop-filter:blur(5px)}
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body.museum-refined .mr-dialog header h2{font-size:24px;margin:0}
body.museum-refined .mr-dialog header .mr-button{border:0;padding:6px;font-size:12px}
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body.museum-refined .mr-subjects{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin-bottom:10px}
body.museum-refined .mr-subjects button{background:none;border:0;border-bottom:1px solid transparent;padding:12px 3px;font-size:15px;color:var(--muted)}
body.museum-refined .mr-subjects button[aria-selected=true]{color:var(--fg);border-bottom-color:var(--accent)}
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body.museum-refined .mr-chapter-row>img{width:54px;height:50px;object-fit:cover;opacity:.88}
body.museum-refined .mr-chapter-row .mr-chapter-number{flex:0 0 22px;font:400 20px/1 var(--font-display);color:var(--muted)}
body.museum-refined .mr-chapter-copy{flex:1;min-width:0}
body.museum-refined .mr-chapter-copy strong{display:block;font:400 16px/1.5 var(--font-display);letter-spacing:.03em}
body.museum-refined .mr-chapter-copy small{display:block;margin-top:4px;font-size:11px;color:var(--muted);letter-spacing:.05em}
body.museum-refined .mr-chapter-row .mr-icon{width:16px;height:16px;flex-basis:16px;color:var(--muted)}
body.museum-refined .mr-chapter-row[aria-current=true]{background:#bba06d0d;color:var(--accent)}
body.museum-refined .mr-directory-topic{display:flex;align-items:center;gap:12px;width:100%;min-height:60px;border:0;background:none;padding:10px 8px 10px 34px;font-size:13px;color:var(--muted);text-align:left}
body.museum-refined .mr-directory-thumb{display:flex;align-items:center;justify-content:center;width:40px;height:40px;flex:0 0 40px;overflow:hidden;border:1px solid var(--line);border-radius:3px;color:var(--accent)}
body.museum-refined .mr-directory-thumb img{width:100%;height:100%;object-fit:contain;display:block}
body.museum-refined .mr-directory-thumb .mr-icon{width:20px;height:20px;flex-basis:20px}
body.museum-refined .mr-directory-topic-title{flex:1;min-width:0;line-height:1.6;overflow-wrap:anywhere}
body.museum-refined .mr-directory-topic>.mr-icon{width:18px;height:18px;flex-basis:18px}
body.museum-refined .mr-directory-actions{display:flex;align-items:center;gap:2px;flex-shrink:0}
body.museum-refined .mr-directory-actions .mr-button{width:44px;height:44px;min-width:44px}
body.museum-refined .mr-directory-actions .mr-icon{width:21px;height:21px;flex-basis:21px}
body.museum-refined .mr-directory-search-field{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:4px;padding-left:12px}
body.museum-refined .mr-directory-search-field>.mr-icon{width:18px;height:18px;flex-basis:18px;color:var(--accent)}
body.museum-refined .mr-directory-search-field input{width:100%;min-width:0;min-height:44px;flex:1;border:0;background:transparent;padding:8px 0;font-size:16px;outline-offset:0}
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body.museum-refined .mr-directory-results{font-size:11px;line-height:1.5;margin:7px 0 10px}
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body.museum-refined #museumRefinedDirectory>header,body.museum-refined #museumRefinedDirectory>.mr-subjects,body.museum-refined #museumRefinedDirectory>.mr-directory-search,body.museum-refined #museumRefinedDirectory>.mr-button{flex-shrink:0}
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body.museum-refined #museumRefinedDirectory .mr-directory-search-field:focus-within{border-color:var(--accent)}
body.museum-refined #museumRefinedDirectory .mr-directory-search-field input{color:var(--fg)!important;background:transparent!important;border:0!important;border-radius:0!important;box-shadow:none!important;outline:none!important}
body.museum-refined #museumRefinedDirectory .mr-directory-search-field input::placeholder{color:var(--muted);opacity:.8}
body.museum-refined #museumRefinedDirectory .mr-directory-search-field .mr-button{background:transparent!important;color:var(--accent)!important;border:0!important;box-shadow:none!important}
body.museum-refined .mr-empty{padding:34px 4px;text-align:center;color:var(--muted);font-size:14px}
body.museum-refined .mr-status{position:fixed;bottom:110px;left:50%;transform:translateX(-50%);width:max-content;max-width:calc(100vw - 36px);z-index:9999;padding:10px 20px;border:1px solid var(--line);border-radius:4px;background:#1b1d1bf5;color:var(--fg);box-shadow:0 4px 20px #0005;font-size:13px}
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body.museum-refined .mr-detail h2{font-size:29px;margin:24px 0}
body.museum-refined .mr-detail-image{width:100%;max-height:62svh;border:0;background:none;padding:0;display:flex;justify-content:center}
body.museum-refined .mr-detail-image img{max-width:100%;max-height:62svh;object-fit:contain}
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body.museum-refined .mr-detail-tools .mr-button{font-size:12px;padding:6px 9px;gap:5px}
body.museum-refined .mr-preview-note{font:11px/1.6 var(--font-body);color:var(--muted);margin:20px 0;opacity:.8}
body.museum-refined #podcastPanel.active-mobile-panel{padding:0 0 calc(90px + env(safe-area-inset-bottom));height:auto;min-height:100svh;overflow:visible}
body.student-page.museum-refined #podcastPanel.active-mobile-panel{padding:0 0 calc(90px + env(safe-area-inset-bottom))!important;height:auto!important;max-height:none!important;min-height:100svh!important;background:transparent!important;overflow:visible!important}
body.student-page.museum-refined #podcastPanel .memory-feed-shell{display:block!important;width:100%!important;height:auto!important;max-height:none!important;min-height:0!important;overflow:visible!important;background:none!important;padding:0!important}
body.student-page.museum-refined #podcastPanel .memory-feed-toolbar{position:relative!important;inset:auto!important;transform:none!important;width:100%!important;max-width:none!important;display:flex!important;margin:0!important;border-radius:0!important;background:var(--ink)!important}
body.student-page.museum-refined #podcastPanel #podcastLibrary{display:block!important;width:100%!important;height:auto!important;max-height:none!important;min-height:0!important;overflow:visible!important;background:none!important;margin:0!important;padding:0!important}
body.museum-refined .memory-feed-shell{display:block;height:auto;min-height:0;overflow:visible;padding:0;background:none;border:0;box-shadow:none}
body.museum-refined .memory-feed-toolbar{position:relative;inset:auto;display:flex;align-items:center;gap:8px;min-height:56px;padding:5px 12px;border:0;border-bottom:1px solid var(--line);background:var(--ink);box-shadow:none;z-index:2}
body.museum-refined .memory-feed-text-button{width:32px;height:44px;min-width:32px;padding:6px;border:0;background:none;border-radius:0;color:var(--accent)}
body.museum-refined .memory-feed-text-button img{width:19px;height:19px}
body.museum-refined .memory-feed-mode-switch{display:flex;align-items:stretch;justify-content:space-around;gap:12px;flex:1;min-width:0;background:none;border:0;padding:0;border-radius:0}
body.museum-refined .memory-feed-mode-switch button{position:relative;flex:1;padding:12px 0;border:0;border-radius:0;font-size:13px;line-height:1.5;white-space:nowrap;color:var(--muted);background:none!important;box-shadow:none;font-weight:400}
body.museum-refined .memory-feed-mode-switch button.active{color:var(--accent)!important}
body.museum-refined .memory-feed-mode-switch button.active:after{content:'';position:absolute;width:40%;bottom:2px;left:30%;height:2px;background:var(--accent)}
body.museum-refined #podcastPanelMeta:empty{display:none}
body.museum-refined #podcastLibrary{height:auto;min-height:0;overflow:visible;border:0;padding:0;margin:0;scroll-snap-type:none}
body.museum-refined .mr-memory{display:grid;grid-template-columns:minmax(0,1fr) 49px;padding:16px 10px 10px 16px;gap:8px;position:relative}
body.museum-refined .mr-memory-image{height:calc(100svh - 193px);display:flex;flex-direction:column;justify-content:center;position:relative;min-height:300px}
body.museum-refined .mr-memory-image>button{border:0;padding:0;background:none;width:100%;height:100%;min-height:0}
body.museum-refined .mr-memory-image img{width:100%;height:100%;object-fit:contain}
body.museum-refined .mr-image-caption{font-size:12px;color:var(--accent);text-align:center;padding:12px 0 0}
body.museum-refined .mr-memory-actions{display:flex;flex-direction:column;gap:22px;justify-content:center}
body.museum-refined .mr-memory-actions .mr-button{padding:0;border:0;border-radius:0;flex-direction:column;gap:4px;font-size:10px;color:var(--accent)}
body.museum-refined .mr-player{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;border:1px solid var(--line);padding:8px;font-size:11px}
body.museum-refined .mr-player .mr-button{font-size:11px;padding:4px;min-height:36px;border:0}
body.museum-refined .mr-flash{padding:0 22px 10px;display:flex;flex-direction:column;align-items:center;gap:12px}
body.museum-refined .mr-flash-filter{display:flex;width:calc(100% + 44px);align-items:center;justify-content:space-between;padding:0 15px;border-bottom:1px solid var(--line);gap:8px;min-height:44px}
body.museum-refined .mr-flash-filter .mr-button{min-height:42px;max-width:80%;gap:6px;padding:6px 0;border:0;font-size:12px;flex-direction:row-reverse}
body.museum-refined .mr-flash-filter .mr-icon{width:16px;height:16px;flex-basis:16px}
body.museum-refined .mr-flash-meta{display:flex;justify-content:space-between;align-items:center;width:100%;font-size:11px;color:var(--muted);margin-top:-4px}
body.museum-refined .mr-flash-meta button{padding:5px 8px;border:0;background:none;color:var(--muted);min-height:32px;font-size:11px}
body.museum-refined .mr-flash-meta button[aria-pressed=true]{color:var(--accent)}
body.museum-refined .mr-flip-stage{height:clamp(260px,calc(100svh - 410px),460px);aspect-ratio:2 / 3;max-width:100%;perspective:1200px;margin:0 0 4px;flex-shrink:0}
body.student-page.museum-refined #podcastPanel.active-mobile-panel:has(.mr-flash){height:calc(100svh - 74px - env(safe-area-inset-bottom))!important;min-height:0!important;max-height:none!important;overflow-y:auto!important;padding-bottom:20px!important;scroll-padding-bottom:20px;overscroll-behavior-y:contain}
body.museum-refined .mr-flip-card{width:100%;height:100%;position:relative;display:block;background:none;padding:0;border:0;transform-style:preserve-3d;transition:transform 560ms cubic-bezier(.22,.65,.22,1);border-radius:10px;box-shadow:5px 8px 18px #0005;color:#352b1e}
body.museum-refined .mr-flip-card:active:not(:disabled){transform:none}
body.museum-refined .mr-flip-card.is-flipped,body.museum-refined .mr-flip-card.is-flipped:active{transform:rotateY(180deg)}
body.museum-refined .mr-card-face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;padding:22px 23px 20px;border-radius:9px;background:#e7d7b9 url('/assets/museum/r210/card-paper.png') center / 100% 100%;border:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;overflow:hidden}
body.museum-refined .mr-card-art{width:100%;height:42%;object-fit:contain;mix-blend-mode:multiply}
body.museum-refined .mr-card-face small{color:#68583e;font-size:10px;letter-spacing:.07em}
body.museum-refined .mr-card-face strong{font:400 clamp(19px,5.4vw,25px)/1.6 var(--font-display);letter-spacing:.035em;color:#352b1e}
body.museum-refined .mr-card-face em{font:400 11px/1.6 var(--font-body);color:#68583e;margin-top:auto}
body.museum-refined .mr-card-back{transform:rotateY(180deg);justify-content:center;gap:20px}
body.museum-refined .mr-card-back h3{color:#352b1e;font-size:23px;margin:0;border-bottom:1px solid #88775255;padding:0 20px 12px}
body.museum-refined .mr-card-back img{width:44px;height:55px;object-fit:contain;opacity:.7;margin-top:4px}
body.museum-refined .mr-flash>.mr-button{width:100%;height:45px;border-color:var(--accent);font-size:17px;letter-spacing:.1em;flex-direction:row-reverse}
body.museum-refined .mr-flash>footer,body.museum-refined .mr-rating{display:flex;justify-content:space-between;gap:10px;width:100%}
body.museum-refined .mr-flash>footer .mr-button{border:0;font-size:13px;padding:3px 0;min-height:36px;flex-direction:row-reverse}
body.museum-refined .mr-rating .mr-button{flex:1;min-height:36px;font-size:13px;padding:4px 10px}
body.museum-refined .mr-flash-empty{min-height:420px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:20px;font-size:14px;text-align:center}
body.museum-refined .mr-quiz-title small{font-size:12px;color:var(--accent)}
body.museum-refined .mr-quiz-title h2{font-size:28px;margin:20px 0 5px}
body.museum-refined .mr-quiz-title p{font-size:13px;margin:0}
body.museum-refined .mr-quiz-exhibit{width:100%;height:200px;object-fit:cover;margin:22px 0 14px;opacity:.9}
body.museum-refined .mr-practice-choices{border-top:1px solid var(--line)}
body.museum-refined .mr-practice-choices button{display:flex;justify-content:space-between;align-items:center;width:100%;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;padding:17px 0;gap:18px;color:var(--accent)}
body.museum-refined .mr-practice-choices strong{display:block;font:400 18px/1.6 var(--font-display);color:var(--fg)}
body.museum-refined .mr-practice-choices small{display:block;color:var(--muted);font-size:12px;margin-top:5px}
body.museum-refined .mr-quiz-question header{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px}
body.museum-refined .mr-quiz-question header .mr-button{border:0;padding:0;font-size:12px}
body.museum-refined .mr-quiz-question header small{font-size:11px}
body.museum-refined .mr-quiz-question>small{font-size:12px;color:var(--muted)}
body.museum-refined .mr-quiz-question h2{font-size:22px;margin:12px 0 24px}
body.museum-refined .mr-quiz-options{display:flex;flex-direction:column;gap:10px}
body.museum-refined .mr-quiz-options button{min-height:52px;padding:10px 13px;background:none;border:1px solid var(--line);border-radius:3px;text-align:left;display:flex;align-items:center;gap:12px;color:var(--fg);font-size:14px}
body.museum-refined .mr-quiz-options button>span{border:1px solid var(--line);border-radius:50%;width:25px;height:25px;text-align:center;line-height:24px}
body.museum-refined .mr-quiz-options button>em{margin-left:auto;font-size:10px;font-style:normal}
body.museum-refined .mr-quiz-options button.correct{background:#a8bfce14;border-color:#a8bfce;color:#c8e0da;opacity:1}
body.museum-refined .mr-quiz-options button.incorrect{border-color:#c59383;color:#dfb9aa;opacity:1}
body.museum-refined .mr-answer{margin-top:30px;font-size:15px;line-height:1.8}
body.museum-refined .mr-answer h3{font-size:16px;color:var(--accent)}
body.museum-refined .mr-answer .mr-button{margin-top:24px;width:100%}
body.museum-refined .mr-setting-row{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:18px 0;border-bottom:1px solid var(--line)}
body.museum-refined .mr-setting-row small{display:block;font-size:11px;color:var(--muted);margin-top:6px}
body.museum-refined .mr-setting-row button{background:none;border:1px solid var(--line);border-radius:4px;min-width:72px;min-height:38px;color:var(--accent);font-size:12px}
body.museum-refined .mr-setting-row [aria-checked=true]{background:#bba06d18;border-color:var(--accent)}
body.museum-refined .mr-sound-settings{display:grid;margin-top:14px;border-top:1px solid var(--line)}
body.museum-refined .mr-sound-settings .mr-button{justify-content:flex-start;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:14px 0;font-size:14px}
body.museum-refined[data-museum-era='china-ming-qing'] .mr-cover>.mr-continue{border-color:#afc4d0;border-radius:3px}
body.museum-refined[data-museum-era='china-qin-han'] .mr-cover>.mr-continue,
body.museum-refined[data-museum-era='china-modern'] .mr-cover>.mr-continue,
body.museum-refined[data-museum-era='world-modern'] .mr-cover>.mr-continue{border-radius:0;border-left-width:3px}
body.museum-refined[data-museum-era='china-song'] .mr-cover>.mr-continue{border-radius:1px 12px 12px 1px}
body.museum-refined[data-museum-era='world-classical'] .mr-cover>.mr-continue{border-radius:0}
body.museum-refined[data-museum-era='china-sui-tang'] .mr-cover>.mr-continue,
body.museum-refined[data-museum-era='world-baroque'] .mr-cover>.mr-continue{border-radius:6px}
@media(min-width:700px){
  body.museum-refined .main-column>.panel.active-mobile-panel{padding:30px 38px 112px}
  body.museum-refined .museum-course-masthead-top{margin-bottom:24px}
  body.museum-refined .museum-brand-lockup strong{font-size:20px}
  body.museum-refined .museum-masthead-shortcuts .mr-button{font-size:12px;gap:6px}
  body.museum-refined #museumCourseTitle{font-size:42px;letter-spacing:.1em}
  body.museum-refined .museum-title-rule{max-width:540px}
  body.museum-refined .museum-week-progress{font-size:13px}
  body.museum-refined .mr-cover{grid-template-columns:85px minmax(0,1fr);column-gap:22px;max-width:820px;margin:auto;row-gap:16px}
  body.museum-refined .mr-timeline{padding-top:28px;margin-left:14px;padding-bottom:70px}
  body.museum-refined .mr-era{font-size:18px;padding-left:16px}
  body.museum-refined .mr-era img{width:39px;height:52px}
  body.museum-refined .mr-archive{aspect-ratio:auto;min-height:490px;height:clamp(470px,55svh,710px);padding:30px 35px;background-size:100% 100%}
  body.museum-refined .mr-archive-copy small{font-size:12px}
  body.museum-refined .mr-archive-copy h3{font-size:28px}
  body.museum-refined .mr-archive-copy p{font-size:12px}
  body.museum-refined .mr-archive-copy{order:2;margin-top:10px}
  body.museum-refined .mr-archive footer{order:3}
  body.museum-refined .mr-timeline .mr-era{position:absolute;width:100%;left:0}
  body.museum-refined .mr-era.previous{display:flex;top:3%;color:var(--muted);opacity:.65}
  body.museum-refined .mr-era.current{top:43%}
  body.museum-refined .mr-era.next{top:85%}
  body.museum-refined .mr-art{margin:15px 0 15px}
  body.museum-refined .mr-archive footer{font-size:11px;padding-top:10px}
  body.museum-refined .mr-cover>.mr-continue{max-width:240px;justify-self:end;font-size:17px}
  body.museum-refined .mr-study-links{font-size:14px}
  body.museum-refined .mr-study-links .mr-button{font-size:14px;max-width:200px}
  body.museum-refined #mobileStudyNav:not(.knowledge-module-dock){padding-left:28px;padding-right:28px}
  body.museum-refined #mobileStudyNav:not(.knowledge-module-dock) button{font-size:13px}
  body.museum-refined .mr-flash{max-width:660px;margin:auto;padding:0 30px 15px;gap:15px}
  body.museum-refined .mr-flip-stage{height:min(62svh,calc(100svh - 410px),670px)}
  body.museum-refined .mr-flash-filter{width:calc(100% + 60px)}
  body.museum-refined .mr-flash-filter .mr-button{font-size:15px}
  body.museum-refined .mr-flash-meta{font-size:13px}
  body.museum-refined .mr-card-face strong{font-size:31px}
  body.museum-refined .mr-card-face small,body.museum-refined .mr-card-face em{font-size:14px}
  body.museum-refined .mr-card-face{padding:32px}
  body.museum-refined .mr-memory{padding:20px 24px;grid-template-columns:minmax(0,1fr) 64px;gap:18px}
  body.museum-refined .mr-memory-actions .mr-button{font-size:12px}
  body.museum-refined .mr-quiz-exhibit{height:300px}
  body.museum-refined .mr-quiz-home,body.museum-refined .mr-quiz-question{max-width:680px;margin:auto}
  body.museum-refined .mr-detail-image img{max-width:100%}
}
@media(max-width:360px){body.museum-refined .main-column>.panel.active-mobile-panel{padding:18px 18px 98px}body.museum-refined #museumCourseTitle{font-size:31px}body.museum-refined .museum-masthead-shortcuts{gap:10px}body.museum-refined .museum-brand-lockup strong{font-size:15px}body.museum-refined .mr-archive{padding:22px 18px}body.museum-refined .mr-archive h3{font-size:21px}body.museum-refined .mr-flash{padding-left:16px;padding-right:16px}}
@media(max-width:699px){
  body.student-page.museum-refined.mr-cover-visible #knowledgeStudyPanel.active-mobile-panel{padding:22px 30px 96px!important}
  body.museum-refined.mr-cover-visible .museum-course-masthead{padding-bottom:12px}
  body.museum-refined.mr-cover-visible .museum-course-masthead-top{margin-bottom:16px}
  body.museum-refined.mr-cover-visible #museumCourseTitle{font-size:48px;line-height:1.25;margin-bottom:9px;letter-spacing:.07em;-webkit-text-stroke:.12px currentColor}
  body.museum-refined.mr-cover-visible .museum-brand-lockup strong{font-size:18px;letter-spacing:.08em}
  body.museum-refined.mr-cover-visible .museum-title-rule{margin-bottom:5px}
  body.museum-refined.mr-cover-visible .museum-week-progress{margin-top:2px}
  body.museum-refined.mr-cover-visible .mr-cover{grid-template-columns:50px minmax(0,1fr);column-gap:10px;row-gap:16px}
  body.museum-refined.mr-cover-visible .mr-timeline{padding-top:55px;padding-bottom:145px}
  body.museum-refined.mr-cover-visible .mr-archive{padding:22px 21px 21px;aspect-ratio:3/4.15}
  body.museum-refined.mr-cover-visible[data-museum-era^='china-'] .mr-archive{padding-right:17%}
  body.museum-refined.mr-cover-visible .mr-archive-copy small{display:block}
  body.museum-refined.mr-cover-visible .mr-archive footer{display:none}
  body.museum-refined.mr-cover-visible .mr-study-links{display:none}
  body.museum-refined.mr-cover-visible .mr-cover>.mr-continue{height:44px;border-radius:0;font-size:17px}
}
@media(max-width:374px){body.museum-refined.mr-cover-visible #museumCourseTitle{font-size:42px}body.student-page.museum-refined.mr-cover-visible #knowledgeStudyPanel.active-mobile-panel{padding-inline:24px!important}}
@media(min-width:1000px) and (max-height:900px){
  body.student-page.museum-refined.mr-cover-visible #knowledgeStudyPanel.active-mobile-panel{display:grid!important;grid-template-columns:minmax(240px,.68fr) minmax(0,1.32fr);align-items:start;gap:24px;padding:30px 30px 100px}
  body.museum-refined.mr-cover-visible .museum-course-masthead{grid-column:1;grid-row:1;min-width:0}
  body.museum-refined.mr-cover-visible .museum-course-masthead-top{gap:12px;margin-bottom:42px}
  body.museum-refined.mr-cover-visible .museum-masthead-shortcuts{gap:12px}
  body.museum-refined.mr-cover-visible .museum-brand-lockup strong{font-size:17px}
  body.museum-refined.mr-cover-visible .museum-masthead-shortcuts .mr-button{font-size:10px}
  body.museum-refined.mr-cover-visible #museumCourseTitle{font-size:42px}
  body.museum-refined.mr-cover-visible .mr-cover{grid-column:2;grid-row:1;grid-template-columns:64px minmax(0,1fr);column-gap:14px}
  body.museum-refined.mr-cover-visible .mr-archive{min-height:0;height:calc(100svh - 280px);max-height:570px;padding-left:26px;padding-top:24px;padding-bottom:24px}
  body.museum-refined.mr-cover-visible .mr-archive h3{font-size:25px}
  body.museum-refined.mr-cover-visible .mr-era{font-size:16px;padding-left:12px}
  body.museum-refined.mr-cover-visible .mr-study-links .mr-button{font-size:12px}
}
@media(prefers-reduced-motion:reduce){body.museum-refined *,body.museum-refined *:before,body.museum-refined *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
body.museum-refined[data-museum-motion=off] *,body.museum-refined[data-museum-motion=off] *:before,body.museum-refined[data-museum-motion=off] *:after{animation:none!important;transition:none!important}

/* r214: a narrow, native-scrolling chapter wheel in the existing timeline slot. */
body.museum-refined.mr-cover-visible .mr-timeline.mr-wheel-timeline{grid-row:1;display:block;min-height:0;margin:0;padding:0;border:0;align-self:stretch}
body.museum-refined .mr-wheel-timeline:before{content:'';position:absolute;left:9px;top:0;bottom:0;width:1px;background:var(--line)}
body.museum-refined .mr-era-wheel{--era-pitch:118px;position:absolute;inset:0;height:100%;overflow-x:hidden;overflow-y:auto;display:flex;flex-direction:column;scroll-snap-type:y mandatory;overscroll-behavior-y:contain;touch-action:pan-y;scrollbar-width:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;mask-image:linear-gradient(transparent,#000 15%,#000 85%,transparent);-webkit-mask-image:linear-gradient(transparent,#000 15%,#000 85%,transparent);cursor:grab}
body.museum-refined .mr-era-wheel::-webkit-scrollbar{display:none}
body.museum-refined .mr-era-wheel:before,body.museum-refined .mr-era-wheel:after{content:'';display:block;flex:0 0 calc(50% - var(--era-pitch)/2)}
body.museum-refined .mr-era-wheel.is-dragging{scroll-snap-type:none;cursor:grabbing}
body.museum-refined .mr-era-wheel-item{position:relative;display:flex;align-items:center;flex:0 0 var(--era-pitch);width:100%;height:var(--era-pitch);min-height:44px;margin:0;padding:0 0 0 22px;border:0;border-radius:0;background:none;box-shadow:none;color:var(--muted);font:400 14px/1.5 var(--font-body);text-align:left;scroll-snap-align:center;cursor:inherit;-webkit-tap-highlight-color:transparent}
body.museum-refined .mr-era-wheel-content{display:flex;flex-direction:column;align-items:flex-start;gap:13px;opacity:var(--era-opacity,.4);transform:scale(var(--era-scale,.9));transform-origin:left center}
body.museum-refined .mr-era-label{position:relative;display:block;max-width:100%;overflow-wrap:anywhere;letter-spacing:.04em}
body.museum-refined .mr-era-label:before{content:'';position:absolute;left:-16px;top:.62em;width:6px;height:6px;border-radius:50%;background:var(--muted);box-shadow:0 0 0 4px var(--ink),0 0 0 5px var(--line)}
body.museum-refined .mr-era-wheel-item.is-centered{color:var(--accent)}
body.museum-refined .mr-era-wheel-item.is-centered .mr-era-label:before{background:var(--accent);box-shadow:0 0 0 4px var(--ink),0 0 0 5px var(--accent)}
body.museum-refined .mr-era-wheel-item img{display:block;width:27px;height:35px;object-fit:contain;pointer-events:none}
body.museum-refined .mr-era-wheel-item:focus-visible{outline:1px solid var(--accent);outline-offset:-1px}
body.museum-refined .mr-wheel-hint{position:absolute;bottom:-18px;left:0;right:0;color:var(--muted);font:9px/1.4 var(--font-body);white-space:nowrap;letter-spacing:.04em;opacity:.75;pointer-events:none}
body.museum-refined .mr-archive-copy{position:relative}
body.museum-refined .mr-archive-copy :is(small,p){padding-right:36px}
body.museum-refined .mr-archive-copy>.mr-chapter-topics{position:absolute;bottom:0;right:-8px;z-index:2;display:flex;align-items:center;justify-content:center;width:44px;height:44px;min-width:44px;min-height:44px;padding:10px;margin:0;border:0;border-radius:2px;background:none;box-shadow:none;color:#655a46;cursor:pointer}
body.museum-refined .mr-chapter-topics .mr-icon{width:22px;height:22px;flex-basis:22px}
body.museum-refined .mr-chapter-topics:is(:hover,[aria-expanded=true]){background:#655a460c;color:#342d22}
body.museum-refined .mr-chapter-topics:focus-visible{outline:1px solid #655a46;outline-offset:1px}
/* The shared memory sheet is portaled out of the hidden memory page for study. */
body.museum-refined>#memoryCollectionBackdrop{position:fixed;inset:0;z-index:190}
body.museum-refined #memoryCollectionBackdrop .memory-collection-sheet{width:min(520px,100%);background:var(--ink)!important;color:var(--fg);border:1px solid var(--line);border-radius:12px 12px 0 0;padding:10px 12px calc(12px + env(safe-area-inset-bottom,0px))}
body.museum-refined #memoryCollectionBackdrop .memory-collection-sheet>header{align-items:flex-start;gap:10px;padding:4px 0 10px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-sheet>header>div{min-width:0;overflow-wrap:anywhere}
body.museum-refined #memoryCollectionBackdrop .memory-collection-sheet>header strong{color:var(--fg);font:400 17px/1.5 var(--font-display)}
body.museum-refined #memoryCollectionBackdrop .memory-collection-sheet>header span{color:var(--muted);font-size:11px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-sheet>header button{min-width:44px;min-height:44px;flex-shrink:0;padding:8px;border:1px solid var(--line);border-radius:3px;background:none;color:var(--accent);font-size:12px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-handle{background:var(--line)}
body.museum-refined #memoryCollectionBackdrop .memory-collection-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px 8px;align-items:start;align-content:start;min-height:0;padding-bottom:4px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-card{align-content:start;gap:3px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-cover{aspect-ratio:1;background:#ffffff08;border:1px solid var(--line);border-radius:3px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-cover em{width:18px;height:18px;top:4px;right:4px;font-size:9px}
body.museum-refined #memoryCollectionBackdrop .memory-collection-card>strong{white-space:normal;overflow-wrap:anywhere;color:var(--fg);font-size:12px;font-weight:400;line-height:1.5}
body.museum-refined #memoryCollectionBackdrop .memory-collection-card>small{color:var(--muted)}
body.museum-refined #memoryCollectionBackdrop .memory-collection-card:focus-visible{outline:1px solid var(--accent);outline-offset:3px}
body.museum-refined .memory-collection-no-image{display:flex;align-items:center;justify-content:center;width:100%;height:100%;color:var(--muted);font-size:13px}
@media(max-width:699px){
  body.museum-refined.mr-cover-visible .mr-cover{grid-template-columns:64px minmax(0,1fr)}
}
@media(min-width:700px){
  body.museum-refined .mr-era-wheel{--era-pitch:154px}
  body.museum-refined .mr-era-wheel-item{font-size:17px;padding-left:24px}
  body.museum-refined .mr-era-wheel-item img{width:35px;height:45px}
  body.museum-refined .mr-era-wheel-content{gap:15px}
  body.museum-refined .mr-era-label:before{left:-18px}
  body.museum-refined .mr-wheel-hint{font-size:11px}
}