/* Active museum design system: the same navigation, type and surfaces on every route. */
:root{--ink:#142f3f;--muted:#536571;--paper:#f8f9f7;--surface:#fff;--line:#d9e0e2;--accent:#b43d32;--accent-dark:#933127;--teal:#087d83;--sans:'Microsoft YaHei','PingFang SC',system-ui,sans-serif;--radius:12px}
html{scroll-padding-top:110px;scrollbar-gutter:stable}body{font:400 1rem/1.85 var(--sans);color:var(--ink);background:var(--paper)}body.reader-open{overflow:hidden}
h1,h2,h3,h4,.quote{font-family:var(--sans);font-weight:600;letter-spacing:-.025em}p{color:var(--muted)}button,input,select{font-family:inherit}a,button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
:is(a,button,input,select,summary,[tabindex='0']):focus-visible{outline:3px solid var(--accent);outline-offset:4px}#main:focus,#main [tabindex='-1']:focus{outline:none}[hidden]{display:none!important}::selection{background:#b43d3224;color:var(--ink)}
.header{min-height:88px;padding:16px max(5vw,24px);background:#f8f9f7f2;border-color:var(--line);gap:24px}.brand{font-size:1.5rem;font-weight:600;letter-spacing:-.035em;gap:12px}.brand img{width:36px;height:36px}.brand small{display:none}
.header nav{gap:32px;font-size:.9375rem}.header nav a{display:flex;align-items:center;min-height:44px;padding:8px 0;border:0;position:relative;color:var(--muted);font-weight:400}.header nav a::after{content:'';position:absolute;bottom:2px;left:0;right:0;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .2s}.header nav a:hover,.header nav a[aria-current]{color:var(--accent-dark);font-weight:600}.header nav a[aria-current]::after,.header nav a:hover::after{transform:scaleX(1)}
.menu{display:none;border:1px solid var(--line);border-radius:8px;min-height:44px;padding:8px 14px;color:var(--ink);background:var(--surface);font-size:.875rem}.skip{top:-100px;border-radius:8px;color:var(--ink)}.skip:focus{top:12px}
.shell{max-width:1400px;padding:52px 5vw 72px}.pagehead{padding:0;margin-bottom:28px;border:0}.pagehead .eyebrow{color:var(--accent-dark);font-size:.875rem;letter-spacing:.035em;margin-bottom:14px;font-weight:400}.eyebrow{font-size:.8125rem;letter-spacing:.03em;color:var(--accent-dark)}.eyebrow::before{display:none}.pagehead h1{font-size:clamp(2rem,3.5vw,3.25rem);line-height:1.4;margin:0 0 16px}.pagehead p{font-size:1rem;max-width:780px;margin:0}
.section-tabs{display:flex;flex-wrap:wrap;gap:8px 30px;border-bottom:1px solid var(--line);margin:0 0 36px}.section-tabs a{display:inline-flex;align-items:center;padding:12px 0;min-height:52px;font-size:1rem;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px}.section-tabs a:hover{color:var(--accent-dark)}.section-tabs a[aria-current]{color:var(--accent-dark);border-color:var(--accent);font-weight:600}
.button{min-height:48px;padding:12px 22px;gap:16px;border:1px solid var(--ink);border-radius:8px;background:var(--ink);color:#fff;font-size:1rem;font-weight:600;transition:background .18s,border-color .18s,box-shadow .18s}.button:hover{background:var(--accent-dark);border-color:var(--accent-dark);box-shadow:0 5px 14px #142f3f12}.button.light{color:var(--ink);background:var(--surface);border-color:#b7c5cc}.button.light:hover{background:#edf2f3;border-color:#79949f}.button:disabled{opacity:.45;box-shadow:none}.actions{gap:16px 24px;align-items:center}
.meta{font-size:.8125rem;color:var(--muted)}.text-link,.source-link{color:var(--accent-dark);border-bottom:1px solid #b43d3240;text-underline-offset:4px}.text-link{font-size:.9375rem}.text-link:hover,.source-link:hover{border-color:var(--accent)}.source-links{display:block;margin:18px 0;color:var(--muted);font-size:.875rem}.source-link{font-size:.875rem;display:inline-block;padding:4px 0}.source-links a{margin-left:8px}
.content-fold{margin-top:28px;padding:0;border-block:1px solid var(--line)}.content-fold+.content-fold{margin-top:-1px}.content-fold>summary{padding:18px 0;min-height:56px;display:flex;justify-content:space-between;gap:20px;align-items:center;list-style:none;cursor:pointer;font-size:1rem;color:var(--ink)}.content-fold>summary::-webkit-details-marker{display:none}.content-fold>summary::after{content:'+';font-size:1.5rem;color:var(--accent);flex-shrink:0}.content-fold[open]>summary::after{content:'−'}.content-fold-body{padding:10px 0 26px}.content-fold-body p{font-size:1rem}.content-fold-body .meta{font-size:.8125rem}
.exhibit-overview,.experience-single{display:grid;grid-template-columns:1.05fr 1fr;background:#edf2f2;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.exhibit-overview>img,.experience-single-visual>img{display:block;width:100%;height:360px;object-fit:cover}.exhibit-overview>div,.experience-single-copy{padding:36px 40px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;min-width:0}.exhibit-overview h2,.experience-single-copy h2{font-size:clamp(1.5rem,2.2vw,2rem);margin:0 0 18px}.exhibit-overview p,.experience-single-copy p{font-size:1rem}.exhibit-overview .meta{font-size:.8125rem;margin:20px 0 0}.exhibit-entry-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px 22px}.exhibit-entry-actions .text-link{min-height:44px;display:inline-flex;align-items:center}
.exhibition-topics{margin-top:42px}.exhibition-topics-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:22px}.exhibition-topics h2{font-size:1.5rem;margin:0}.exhibition-topics-heading p{margin:0;font-size:.875rem}.topic-directory{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}.topic-directory>a{display:block;overflow:hidden;border:1px solid var(--line);border-radius:10px;background:#fff;transition:transform .18s,border-color .18s,box-shadow .18s}.topic-directory a:hover{transform:translateY(-4px);border-color:#87a0a8;box-shadow:0 12px 24px #142f3f10}.topic-directory img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;border-bottom:1px solid var(--line)}.topic-directory a>div{padding:16px 18px}.topic-directory a>div>span{color:var(--accent-dark);font-size:.75rem}.topic-directory h3{font-size:1rem;line-height:1.7;margin:7px 0 12px}.topic-directory p{font-size:.75rem;margin:0;display:flex;justify-content:space-between;gap:8px}.topic-directory p>span{color:var(--accent-dark)}
.gallery-layout{display:flex;flex-direction:column;align-items:stretch;gap:0}.gallery-layout>div{min-width:0}.exhibit{border-radius:10px;padding:0;background:var(--ink);border:1px solid var(--line);overflow:hidden}.exhibit img{display:block;width:100%;height:auto;aspect-ratio:16/9}.board-menu{display:flex;flex-direction:row;align-items:stretch;gap:12px;overflow-x:auto;scroll-snap-type:x proximity;padding:0 0 14px;margin-bottom:24px}.gallery-layout>.board-menu{order:-1}.board-menu button{display:block;min-width:0;width:190px;flex:0 0 190px;scroll-snap-align:start;padding:0;overflow:hidden;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:8px;text-align:left;transition:border-color .18s,background .18s}.board-menu button img{display:block;width:100%;height:auto;aspect-ratio:16/9}.board-menu-label{display:block;padding:9px 12px}.board-menu-label>span{display:block;margin:0;color:var(--muted);font-size:.6875rem}.board-menu-label>strong{display:block;margin-top:2px;font-size:.8125rem;font-weight:500;line-height:1.6}.board-menu button:hover{border-color:#8fa7b2}.board-menu button.active{background:var(--ink);border-color:var(--ink);color:#fff}.board-menu button.active .board-menu-label>span{color:#c4d7df}.gallery-actions{gap:10px;justify-content:flex-end;margin-top:16px}.gallery-actions .button{padding:10px 14px;min-height:44px;font-size:.875rem}.gallery-actions .meta{margin-right:auto}.board-intro{margin:0 0 22px}.board-intro h2{font-size:clamp(1.4rem,2.4vw,2rem);margin:6px 0 10px;line-height:1.5}.board-intro p{margin:0;font-size:1rem;max-width:950px}.board-discussion{padding:24px 28px;margin-top:26px;background:#edf2f2;border-radius:10px}.board-discussion h3{font-size:1.125rem;margin:4px 0 16px}.board-choice-buttons{display:flex;flex-wrap:wrap;gap:10px}.board-choice-buttons button{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:48px;padding:11px 18px;border:1px solid #bacbd0;border-radius:7px;background:#fff;color:var(--ink);font-size:.875rem;text-align:left}.board-choice-buttons button:hover,.board-choice-buttons button[aria-pressed=true]{border-color:var(--teal);background:#e4efed}.board-choice-buttons button>span{color:var(--teal)}.board-feedback{margin:18px 0 0;padding-top:16px;border-top:1px solid #c8d6d6;color:var(--ink);font-size:.9375rem}.gallery-text{padding:16px 0 24px;border:0;margin:0}.gallery-text h2{font-size:1.5rem}.gallery-text p{font-size:1rem}.gallery-text .meta{font-size:.8125rem}
.tech-layout{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:36px}.diagram{padding:32px;border-radius:var(--radius);background:var(--ink)}.diagram-caption{color:#c3d7de;font-size:.8125rem;letter-spacing:.04em}.diagram h3{color:#fff;font-size:1.75rem;margin:20px 0}.diagram small{color:#c3d7de;font-size:.875rem}.diagram-flow{margin:24px 0;gap:10px}.diagram-flow button{background:#ffffff08;border-color:#587583;color:#fff;border-radius:8px;padding:14px 16px;min-height:50px;font-size:.9375rem}.diagram-flow button:hover{border-color:#c3d7de}.diagram-flow button.active{background:#e5f3f1;color:var(--ink);border-color:#e5f3f1}
#tech-detail{padding:28px 32px;min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}#tech-detail h2{font-size:1.625rem;line-height:1.5}.device-takeaway{color:var(--teal);font-size:1.375rem;font-weight:600;padding-bottom:20px;border-bottom:1px solid var(--line)}.notice{background:#edf3f4;color:#405e6c;font-size:.9375rem;padding:18px 22px;border-left:3px solid var(--teal);border-radius:0 8px 8px 0}.definition{border-color:var(--line);padding:26px 0}.definition h3{font-size:1.5rem}.definition p{font-size:1rem}.split{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px}
.portrait-type{background:var(--ink);border-radius:var(--radius);color:#fff;padding:40px;min-height:300px}.portrait-type strong{font-size:4rem;font-weight:600;letter-spacing:.16em}.portrait-type span{font-family:inherit;color:#cadde3;font-size:1.25rem;letter-spacing:.06em}.portrait-type p{color:#cadde3;font-size:1rem}.timeline{margin:0}.time-row{grid-template-columns:140px minmax(0,1fr);border-color:var(--line);gap:24px;padding:28px 0}.time-row time{font:600 1rem/1.8 var(--sans);color:var(--accent-dark)}.time-row h3{font-size:1.375rem}.time-row p{font-size:1rem}.story-grid{gap:20px;margin-top:0}.story{background:var(--surface);border-color:var(--line);border-radius:var(--radius);padding:24px}.story summary{min-height:44px;align-items:center}.story summary::-webkit-details-marker{display:none}.story summary span{color:var(--accent-dark);font-size:.8125rem}.story h3{font-size:1.125rem;line-height:1.65}.story p{font-size:1rem}.case-question{padding:14px 16px;margin:20px 0;background:#edf3f4;border-left:3px solid var(--teal);color:#405e6c;font-size:.9375rem}
.experience-single-visual{min-width:0}.experience-single-copy p{margin-bottom:24px}.experience-role-diagram{display:flex;flex-direction:column;justify-content:center;gap:16px;padding:32px;background:#e4edef}.experience-role{display:flex;align-items:center;gap:24px;padding:18px 20px;border:1px solid #b8ccd3;border-radius:8px;background:#ffffff70}.experience-role strong{min-width:90px;font-size:1.5rem;font-weight:600;color:var(--ink)}.experience-role span{font-size:1rem;color:#405e6c}.experience-notes{margin-top:30px;padding-top:18px;border-top:1px solid var(--line)}.experience-notes summary{min-height:44px;cursor:pointer;color:var(--muted);font-size:.9375rem}.experience-notes p{font-size:1rem;max-width:880px;margin-top:16px}.experience-page[data-running='true'] .experience-notes{display:none}
.frame-top{align-items:center;margin-top:12px}.frame-top h2{font-size:1.5rem;margin:0}.frame-tools{display:flex;flex-wrap:wrap;gap:10px}.frame-tools .button{font-size:.875rem}.frame-wrap{border-color:#b8ccd3;border-radius:var(--radius);overflow:hidden;height:75vh;min-height:460px}.frame-wrap:fullscreen{height:100dvh;width:100vw;margin:0;border:0;border-radius:0}.experience-loading{color:var(--teal);font-size:.9375rem;margin:18px 0 -10px}#experience-stage,#drive,#sandbox,#xiaotie{scroll-margin-top:115px}
.experience-chat-single{max-width:960px;margin:auto}.experience-chat-single .xt-guide>.eyebrow{display:none}.xt-card{background:var(--surface);border-color:var(--line);border-radius:var(--radius);box-shadow:0 10px 32px #142f3f06}.xt-header{background:var(--ink)}.xt-header h3{font:600 1.375rem/1.5 var(--sans)}.xt-header h3 span,.xt-header p{font-size:.8125rem;color:#d2e3e9}.xt-header i{display:none}.xt-avatar{background:#edf3f4;border-radius:12px}.xt-reset{font-size:.875rem;min-height:44px;border-color:#809ba8;color:#fff}.xt-reset:hover{background:#315568}.xt-toolbar{border-color:var(--line)}.xt-toolbar>span,.xt-input-label{font-size:.875rem;color:var(--muted)}.xt-modes{background:#edf3f4}.xt-modes button{font-size:.875rem;min-height:44px;color:var(--muted)}.xt-modes button[aria-pressed=true]{color:var(--teal);background:var(--surface)}
.xt-messages{height:420px;padding:24px;scrollbar-color:#b9cbd1 transparent}.xt-speaker,.xt-follow-label{font-size:.8125rem;color:var(--muted)}.xt-text{font-size:1rem;line-height:1.85}.xt-bubble{background:#f0f5f6;color:var(--ink);border-color:#dce7eb}.xt-user .xt-bubble{background:var(--ink);border-color:var(--ink);color:#fff}.xt-sources,.xt-related{border-color:#c8dbe2;font-size:.875rem}.xt-sources summary{min-height:36px;color:#08666b}.xt-sources a,.xt-related a{color:#08666b;font-size:.875rem}.xt-sources a span{font-size:.8125rem;color:var(--muted)}.xt-suggestions button{min-height:44px;padding:10px 14px;font-size:.875rem;background:#fff;color:var(--ink);border-color:#bcced5}.xt-suggestions button:hover{background:#edf3f4;border-color:#719aa8}.xt-suggestions button span{color:var(--teal)}.xt-form{background:#f6f8f9;border-color:var(--line)}.xt-compose input{font-size:1rem;color:var(--ink);min-height:48px;border-color:#abc2cc;padding:12px}.xt-compose button{font-size:.9375rem;min-height:48px;color:#fff;background:var(--accent-dark)}.xt-compose button:hover{background:var(--ink)}.xt-input-note{font-size:.8125rem;color:var(--muted)}.xt-categories{gap:24px;border-color:var(--line)}.xt-categories button{min-height:44px;font-size:.875rem;color:var(--muted)}.xt-categories button[aria-pressed=true]{color:var(--teal);border-color:var(--teal)}.xt-boundary{font-size:.875rem;color:var(--muted)}.xt-boundary a{color:var(--accent-dark)}
.session-plan{padding:30px;background:var(--surface);border-color:var(--line);border-radius:var(--radius)}.session-plan h3,.learning-intro h2{font-size:1.5rem}.status{padding:6px 12px;font-size:.875rem;color:#405e6c;background:#e9f1f3;border-radius:6px}.plan-row{grid-template-columns:116px minmax(0,1fr);border-color:var(--line)}.plan-row strong{font-size:.875rem;color:var(--accent-dark)}.plan-row b,.plan-row p{font-size:1rem}.answer-form{gap:24px}.answer-form label{font-size:1rem}.answer-form select{display:block;margin-top:10px;min-height:48px;width:min(340px,100%);padding:10px 14px;border:1px solid #abc2cc;border-radius:8px;background:#fff;color:var(--ink);font-size:1rem}.quiz-result{color:var(--ink);font-size:1rem}.quiz-result:empty{display:none}.quiz-result strong{color:var(--teal)}
.library-search{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;font-size:.9375rem;color:var(--ink);margin-bottom:14px}.library-search input{width:min(520px,100%);min-width:0;min-height:50px;padding:12px 16px;font-size:1rem;background:var(--surface);color:var(--ink);border:1px solid #abc2cc;border-radius:8px}.documents{gap:22px;margin-top:28px}.doc-item{padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);min-width:0;transition:border-color .18s,box-shadow .18s}.doc-item:hover{border-color:#a3bac5;box-shadow:0 8px 24px #142f3f06}.doc-index{display:block;color:var(--teal);font-size:.8125rem;letter-spacing:.02em;margin-bottom:14px}.doc-item h2{font-size:1.375rem;line-height:1.65;margin-bottom:16px}.doc-item p{font-size:1rem}.doc-item :is(a,button){display:inline-flex;align-items:center;min-height:44px;color:var(--accent-dark);font-size:.9375rem;margin-right:20px;border-color:#b43d3240}.library-utilities{display:flex;flex-wrap:wrap;gap:16px 30px;padding-top:24px;margin-top:28px;border-top:1px solid var(--line);font-size:.9375rem}.library-utilities a{min-height:44px;display:inline-flex;align-items:center}
/* The reading shelf is scoped to the documents route; sources keep their own layout. */
.library-page.shell{padding-top:32px;padding-bottom:54px}
.library-page .pagehead{margin-bottom:18px}
.library-page .pagehead .eyebrow{font-size:.8125rem;margin-bottom:8px}
.library-page .pagehead h1{font-size:clamp(1.875rem,2.65vw,2.5rem);line-height:1.45;margin-bottom:10px}
.library-page .pagehead p{font-size:.9375rem;line-height:1.8;max-width:760px}
.library-page .section-tabs{margin-bottom:22px}
.library-page .section-tabs a{font-size:.9375rem;min-height:46px;padding-block:10px}
.library-page .library-toolbar{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;margin:0 0 16px}
.library-page #doc-count{margin:0;color:var(--muted);font-size:.8125rem;font-variant-numeric:tabular-nums}
.library-page .library-search{display:flex;align-items:center;gap:10px;margin:0;font-size:.875rem;min-width:0}
.library-page .library-search>span{white-space:nowrap}
.library-page .library-search input{width:330px;max-width:100%;min-width:0;min-height:44px;font-size:.875rem;line-height:1.5;padding:9px 12px;border:1px solid #b5c8d0;border-radius:8px;margin:0;background:#fff;transition:border-color .18s,box-shadow .18s}
.library-page .library-search input:hover{border-color:#7897a4}
.library-page .documents{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch;gap:18px;margin:0}
.library-page .doc-item{--cover-bg:#142f3f;--cover-ink:#fff;--cover-soft:#d5e4ea;display:flex;flex-direction:column;min-width:0;padding:0;border:1px solid #d2dde1;border-radius:11px;background:#fff;overflow:hidden;box-shadow:0 2px 8px #142f3f03;transition:transform .18s,border-color .18s,box-shadow .18s}
.library-page .doc-item[data-doc='1']{--cover-bg:#087d83;--cover-ink:#fff;--cover-soft:#e2f3f2}
.library-page .doc-item[data-doc='2']{--cover-bg:#f0eee6;--cover-ink:#142f3f;--cover-soft:#58686e}
.library-page .doc-item[data-doc='3']{--cover-bg:#e2edf1;--cover-ink:#142f3f;--cover-soft:#486570}
.library-page .doc-item[data-doc='4']{--cover-bg:#b43d32;--cover-ink:#fff;--cover-soft:#ffebe7}
.library-page .doc-item[data-doc='5']{--cover-bg:#79352e;--cover-ink:#fff;--cover-soft:#f2deda}
.library-page .doc-cover{display:grid;grid-template-columns:minmax(0,1fr) 82px;grid-template-rows:auto auto auto;gap:6px 12px;align-content:start;min-height:126px;padding:14px 16px;background:var(--cover-bg);color:var(--cover-ink);border-bottom:1px solid #142f3f0a}
.library-page .doc-cover-top{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;gap:10px;min-width:0}
.library-page .doc-cover .doc-index{display:block;color:var(--cover-soft);font-size:.75rem;line-height:1.5;letter-spacing:.025em;margin:0;min-width:0}
.library-page .doc-number{color:var(--cover-soft);font-size:.75rem;line-height:1.5;letter-spacing:.08em;font-variant-numeric:tabular-nums;flex-shrink:0}
.library-page .doc-item .doc-hook{grid-column:1;grid-row:2;align-self:center;font-size:1.125rem;line-height:1.4;letter-spacing:0;color:var(--cover-ink);font-weight:600;margin:0;min-width:0;overflow-wrap:anywhere}
.library-page .doc-cover-detail{display:contents}
.library-page .doc-cover-detail>span{grid-column:1/-1;grid-row:3;font-size:.75rem;line-height:1.5;color:var(--cover-soft);overflow-wrap:anywhere}
.library-page .doc-cover-detail svg{grid-column:2;grid-row:2;align-self:center;justify-self:end;display:block;width:82px;max-width:100%;height:48px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;color:var(--cover-soft);pointer-events:none}
.library-page .doc-body{display:flex;flex-direction:column;flex:1;min-width:0;padding:16px}
.library-page .doc-item .doc-title{margin:0;color:var(--ink);font-size:.9375rem;font-weight:600;line-height:1.6;overflow-wrap:anywhere}
.library-page .doc-item .doc-teaser{margin:6px 0 0;color:var(--muted);font-size:.875rem;line-height:1.75;overflow-wrap:anywhere}
.library-page .doc-topics{display:flex;flex-wrap:wrap;gap:5px;margin:10px 0 0;padding:0;list-style:none}
.library-page .doc-topics li{font-size:.75rem;line-height:1.5;color:#47616e;background:#edf3f4;border:1px solid #e2eaed;padding:2px 7px;border-radius:4px;overflow-wrap:anywhere}
.library-page .doc-item .doc-use{font-size:.75rem;line-height:1.7;color:var(--muted);margin:8px 0 0;overflow-wrap:anywhere}
.library-page .doc-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 12px;margin-top:auto;padding-top:14px}
.library-page .doc-item .doc-read{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:44px;margin:0;padding:9px 14px;border:1px solid var(--ink);border-radius:7px;background:var(--ink);color:#fff;font:600 .875rem/1.5 var(--sans);cursor:pointer;transition:background .18s,border-color .18s}
.library-page .doc-item .doc-read:hover{background:var(--accent-dark);border-color:var(--accent-dark)}
.library-page .doc-read-arrow{display:inline-block;transition:transform .18s}
.library-page .doc-item .doc-download{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;margin:0;padding:8px 4px;color:#566d78;border:0;background:transparent;font-size:.8125rem;font-weight:400;line-height:1.5;text-decoration:none}
.library-page .doc-item .doc-download:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.library-page .library-utilities{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:22px;padding-top:16px;border-top:1px solid var(--line);font-size:.875rem}
.library-page .library-utilities a{display:inline-flex;align-items:center;min-height:44px;color:var(--accent-dark)}
.library-page .doc-empty{padding:28px 24px;text-align:center;border:1px dashed #b7cad2;border-radius:10px;background:#eef3f4;margin-top:4px}
.library-page .doc-empty h2{font-size:1.25rem;margin:0 0 8px;line-height:1.5}
.library-page .doc-empty p{font-size:.9375rem;margin:0 0 18px;line-height:1.8}
.library-page #doc-reset{min-height:44px;font-size:.875rem;padding:10px 16px}
@media(hover:hover){.library-page .doc-item:hover{transform:translateY(-2px);border-color:#9db4c0;box-shadow:0 6px 18px #142f3f0b}.library-page .doc-read:hover .doc-read-arrow{transform:translateX(2px)}}
@media(max-width:1100px){.library-page .documents{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.library-page.shell{padding-top:26px;padding-bottom:44px}.library-page .pagehead h1{font-size:1.875rem}.library-page .pagehead p{font-size:.9375rem}.library-page .section-tabs{margin-bottom:18px}.library-page .library-toolbar{align-items:stretch;gap:10px;margin-bottom:14px}.library-page #doc-count{width:100%}.library-page .library-search{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;width:100%}.library-page .library-search input{width:100%;margin:0}.library-page .documents{grid-template-columns:minmax(0,1fr);gap:14px}.library-page .doc-cover{grid-template-columns:minmax(0,1fr) 72px}.library-page .doc-cover-detail svg{width:72px;height:43px}.library-page .doc-body{padding:15px 16px}.library-page .library-utilities{margin-top:18px}.library-page .doc-empty{padding:24px 18px}}
@media(max-width:380px){.library-page .library-search{grid-template-columns:minmax(0,1fr);gap:6px}.library-page .doc-cover{grid-template-columns:minmax(0,1fr) 64px;gap:6px 10px}.library-page .doc-cover-detail svg{width:64px;height:38px}}
@media(prefers-reduced-motion:reduce){.library-page .doc-item:hover,.library-page .doc-read:hover .doc-read-arrow{transform:none}}
.source-return{margin-bottom:24px}.source-all{display:inline-block;margin-left:24px;color:var(--accent-dark);font-size:.9375rem;min-height:44px}.source-row{grid-template-columns:64px minmax(0,1fr);gap:24px;padding:30px 0;border-color:var(--line)}.source-row .sid{font:600 1rem/1.8 var(--sans);color:var(--accent-dark)}.source-row h2{font-size:1.375rem;line-height:1.6;margin-bottom:12px}.source-row p{font-size:1rem}
footer{margin:0;color:var(--ink);background:#edf2f2;border-top:1px solid var(--line)}.footer-inner.footer-compact{max-width:1400px;display:flex;align-items:baseline;justify-content:space-between;gap:24px;padding:30px 5vw}.footer-compact strong{font-size:1rem;font-weight:600}.footer-compact :is(summary,a,p){font-size:.875rem;color:var(--muted)}.footer-compact summary{cursor:pointer;min-height:44px}.footer-compact>a{min-height:44px}.footer-compact p{line-height:2;margin-top:12px}
dialog{width:min(1060px,94vw);max-height:90dvh;border:1px solid var(--line);border-radius:14px;color:var(--ink);background:var(--paper);box-shadow:0 24px 100px #071b2e44}dialog::backdrop{background:#0b243ab8;backdrop-filter:blur(5px)}.reader-toolbar{background:#f8f9f7f5;border-color:var(--line);padding:20px 28px}.reader-toolbar h2{font-size:1.125rem;line-height:1.6}.reader-toolbar button{font-size:.875rem;min-height:44px}#reader-body{padding:32px clamp(24px,5vw,64px) 48px}#reader-body p{font-size:1rem;line-height:2;color:#3e5562}#reader-body :is(h2,h3,h4){color:var(--ink);scroll-margin-top:110px;margin:32px 0 18px}#reader-body h2{font-size:1.75rem}#reader-body h3{font-size:1.375rem}#reader-body h4{font-size:1.125rem}#reader-body .reader-summary{background:#eaf2f4;padding:20px 24px;border-left:3px solid var(--teal);border-radius:0 8px 8px 0}#reader-body table{font-size:.875rem}#reader-body :is(th,td){text-align:left;padding:12px;border:1px solid #c6d7df}#reader-body th{background:#eaf2f4}.reader-toc{padding:16px 0;border-block:1px solid var(--line);margin:24px 0}.reader-toc summary{min-height:44px;cursor:pointer;font-size:1rem}.reader-toc nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px;max-height:300px;overflow:auto;margin-top:16px}.reader-toc a{color:#08666b;font-size:.9375rem;padding:6px 0}.reader-toc a:hover{text-decoration:underline}
/* Entrance and film share the same theme; no route-specific global overrides. */
.welcome-wrap{max-width:1440px;margin-inline:auto;padding-inline:5vw}.welcome-hero{padding-block:46px 40px}.welcome-hero-grid{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:7vw}.welcome-copy{padding-block:16px 32px}.welcome-kicker{font-size:.9375rem;color:var(--muted);margin-bottom:28px;display:flex;align-items:center;gap:14px}.welcome-kicker::before{content:'';width:26px;height:2px;background:var(--accent)}.welcome-copy h1{font-size:clamp(4.5rem,7.5vw,7rem);line-height:1.16;margin:0 0 30px;letter-spacing:-.045em}.welcome-copy h1 span{color:var(--accent)}.welcome-copy>p{font-size:1.125rem;line-height:1.9;margin-bottom:32px}.welcome-actions{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px}.welcome-primary{display:inline-flex;align-items:center;gap:32px;min-height:54px;padding:14px 24px;border-radius:30px;background:var(--ink);color:#fff;font-size:1rem;font-weight:600;transition:background .2s,box-shadow .2s}.welcome-primary:hover{background:var(--accent-dark);box-shadow:0 6px 20px #142f3f16}.welcome-film{display:inline-flex;align-items:center;gap:12px;min-height:48px;color:var(--accent-dark);font-size:1rem}.welcome-film:hover{color:var(--ink)}.welcome-arrow{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.5;flex-shrink:0}
.welcome-art{position:relative;margin:0;min-width:0;padding-top:12px}.welcome-art::before{content:'';position:absolute;left:20px;right:-16px;top:0;height:calc(100% - 38px);border:1px solid #b43d3265;border-radius:320px 320px 8px 8px;pointer-events:none}.welcome-picture{overflow:hidden;height:clamp(440px,40vw,560px);position:relative;border-radius:320px 320px 8px 8px;background:var(--ink)}.welcome-picture::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 65%,#071b2e35);pointer-events:none}.welcome-visual{width:100%;height:100%;display:block;object-fit:cover;object-position:82% center}.welcome-art figcaption{padding-top:12px;display:flex;justify-content:flex-end;font-size:.8125rem;color:var(--muted)}.welcome-art figcaption a{border-bottom:1px solid var(--line)}.welcome-art figcaption a:hover{color:var(--accent-dark);border-color:var(--accent)}.welcome-caption{display:flex;justify-content:space-between;align-items:center;gap:24px;padding-top:32px;margin-top:10px;font-size:.875rem;color:var(--muted)}.welcome-caption span:last-child{display:flex;align-items:center;gap:18px}.welcome-caption span:last-child::before{content:'';width:50px;height:1px;background:#9daeb7}
.welcome-explore{padding-block:48px 72px;border-top:1px solid var(--line)}.welcome-section-head{display:flex;align-items:baseline;margin-bottom:30px;gap:24px}.welcome-section-head h2{font-size:1.75rem;margin:0}.welcome-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.welcome-card{min-width:0}.welcome-card-image{width:100%;height:230px;overflow:hidden;border-radius:var(--radius);background:#e4edef}.welcome-card-image img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .45s cubic-bezier(.2,.65,.3,1)}.welcome-card-copy{display:flex;justify-content:space-between;align-items:center;gap:18px;padding-top:22px}.welcome-card h3{font-size:1.5rem;margin:0}.welcome-card-copy .welcome-arrow{color:var(--accent);transition:transform .22s}.welcome-card p{font-size:1rem;margin:10px 0 0}.welcome-card-image--signal{background:#e4edef}.welcome-signal-graphic{display:block;width:100%;height:100%}
.film-screen{max-width:1100px;margin-inline:auto}.film-controls{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-bottom:22px}.film-language{display:flex;flex-wrap:wrap;gap:8px;padding:5px;border:1px solid var(--line);border-radius:12px;background:#edf2f2}.film-language button{font:400 1rem/1.5 var(--sans);min-height:46px;padding:10px 18px;color:var(--muted);background:transparent;border:1px solid transparent;border-radius:8px;transition:background .18s,color .18s}.film-language button[aria-pressed=true]{color:#fff;background:var(--ink)}.film-language button:hover{color:var(--accent-dark)}.film-language button[aria-pressed=true]:hover{color:#fff;background:#264b60}.film-runtime{font-size:.875rem;color:var(--muted);white-space:nowrap}.film-player{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#0a1c2c;border-radius:var(--radius);color-scheme:dark;box-shadow:0 12px 36px #142f3f14}.film-caption{display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:12px 24px;padding-top:18px}.film-caption p,.film-caption a{margin:0;font-size:.875rem;line-height:1.85}.film-caption p{color:var(--muted)}.film-caption a{color:var(--accent-dark);min-height:44px;display:inline-flex;align-items:center}
@media(hover:hover){.welcome-card:hover .welcome-card-image img{transform:scale(1.035)}.welcome-card:hover .welcome-arrow{transform:translate(2px,-2px)}}
@media(max-width:1100px){.welcome-hero-grid{gap:5vw}.welcome-copy h1{font-size:5rem}.welcome-picture{height:460px}.welcome-card-image{height:200px}}
@media(max-width:1050px){.header nav{gap:24px}.gallery-layout{grid-template-columns:minmax(0,1fr)}.topic-directory{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:900px){.header{min-height:80px}.menu{display:block}.header nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);padding:18px 5vw;max-height:calc(100dvh - 80px);overflow:auto;box-shadow:0 16px 28px #142f3f14}.header nav.open{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px}.header nav a{font-size:1rem;min-height:48px}.exhibit-overview>div,.experience-single-copy{padding:28px}.welcome-copy h1{font-size:4.5rem}.welcome-picture{height:430px}.welcome-card-grid{gap:22px}.welcome-card-image{height:180px}}
@media(max-width:700px){
 html{scroll-padding-top:100px}.header{padding-inline:24px;gap:12px}.brand{font-size:1.25rem;gap:10px}.brand img{width:32px;height:32px}.shell{padding:32px 24px 48px}.pagehead{margin-bottom:24px}.pagehead h1{font-size:2rem}.section-tabs{gap:0 20px;margin-bottom:28px}.section-tabs a{font-size:.9375rem}.section-tabs[aria-label='主题展览阅读方向']{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
 .exhibit-overview,.experience-single,.tech-layout,.split{grid-template-columns:minmax(0,1fr);gap:24px}.exhibit-overview,.experience-single{gap:0}.exhibit-overview>img,.experience-single-visual>img{height:240px}.exhibit-overview>div,.experience-single-copy{padding:26px}.topic-directory{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.topic-directory a>div{padding:12px}.topic-directory h3{font-size:.875rem}.exhibition-topics-heading{display:block}.exhibition-topics-heading p{margin-top:8px}.board-menu button{flex-basis:160px}.board-discussion{padding:20px}.board-choice-buttons button{width:100%}.gallery-layout>.board-menu{grid-row:1}.gallery-actions{display:grid;grid-template-columns:1fr 1fr}.gallery-actions .meta{text-align:center}.gallery-text>p strong{display:block}.diagram,#tech-detail{padding:26px}.diagram h3{font-size:1.5rem}.portrait-type{min-height:260px;padding:32px}.time-row{grid-template-columns:minmax(0,1fr);gap:8px}.story-grid{grid-template-columns:minmax(0,1fr)}.story{padding:20px}.content-fold-body .split{gap:0}
 .experience-role-diagram{padding:24px}.experience-role{padding:16px;gap:16px}.experience-role strong{min-width:76px;font-size:1.25rem}.frame-top{display:block}.frame-top h2{margin-bottom:16px}.frame-tools{gap:8px}.frame-tools .button{padding:10px 14px}.frame-wrap{height:80dvh;min-height:560px}.xt-header{align-items:flex-start;flex-wrap:wrap;gap:16px}.xt-toolbar{align-items:flex-start;flex-wrap:wrap}.xt-messages{height:390px;padding:20px 16px}.xt-message{max-width:98%}.xt-text{font-size:1rem}.xt-categories{flex-wrap:wrap;gap:0 24px}.xt-input-note{flex-wrap:wrap}.session-plan{padding:24px}.plan-row{grid-template-columns:92px minmax(0,1fr);gap:12px}
 .documents{grid-template-columns:minmax(0,1fr)}.doc-item{padding:24px}.library-search{display:block}.library-search input{width:100%;display:block;margin-top:10px}.source-row{grid-template-columns:40px minmax(0,1fr);gap:16px}.source-row h2{font-size:1.25rem}.source-all{display:block;margin:0 0 10px}.footer-inner.footer-compact{display:flex;flex-direction:column;gap:8px;padding:28px 24px}.reader-toolbar{padding:16px;gap:12px;align-items:flex-start}.reader-toolbar h2{font-size:1rem}.reader-toolbar .button{padding:10px 12px}#reader-body{padding:24px}.reader-toc nav{grid-template-columns:minmax(0,1fr)}
 .welcome-wrap{padding-inline:24px}.welcome-hero{padding-block:32px 30px}.welcome-hero-grid{grid-template-columns:minmax(0,1fr);gap:32px}.welcome-copy{padding:0}.welcome-kicker{font-size:.875rem;margin-bottom:22px}.welcome-copy h1{font-size:clamp(3.75rem,15vw,5.5rem);margin-bottom:22px}.welcome-copy>p{font-size:1rem;margin-bottom:24px}.welcome-actions{gap:12px 18px}.welcome-art{margin-left:12%}.welcome-art::before{right:-10px;left:14px}.welcome-picture{height:360px}.welcome-caption{align-items:flex-start;padding-top:26px;margin:0;font-size:.8125rem}.welcome-caption span:first-child{max-width:210px}.welcome-caption span:last-child{white-space:nowrap}.welcome-caption span:last-child::before{width:20px}.welcome-explore{padding-block:34px 48px}.welcome-section-head h2{font-size:1.5rem}.welcome-card-grid{grid-template-columns:minmax(0,1fr);gap:32px}.welcome-card-image{height:240px}.welcome-card-copy{padding-top:18px}.film-controls{gap:14px;margin-bottom:18px}.film-language button{padding-inline:14px;font-size:.9375rem}.film-caption{display:block}.film-caption a{margin-top:8px}
}
@media(max-width:380px){.header,.shell{padding-inline:18px}.brand{font-size:1.125rem;gap:8px}.brand img{width:28px;height:28px}.menu{padding-inline:10px}.pagehead h1{font-size:1.875rem}.xt-identity{gap:10px}.xt-compose{flex-wrap:wrap}.xt-compose input{flex-basis:100%}.xt-compose button{margin-left:auto}.experience-role{flex-wrap:wrap;gap:4px 16px}.plan-row{grid-template-columns:minmax(0,1fr);gap:4px}.welcome-wrap{padding-inline:18px}.welcome-picture{height:310px}.welcome-caption{gap:12px}.welcome-caption span:last-child::before{display:none}.welcome-card-image{height:210px}.film-language{width:100%;gap:4px}.film-language button{flex:1;padding-inline:8px}}
/* Long source names and enlarged text must reflow inside their reading columns. */
.library-page .doc-item{cursor:pointer}
#main p,.source-row h2,.source-row a,.doc-item h2{overflow-wrap:anywhere}
.brand{min-width:0;flex-shrink:1}.brand img,.menu{flex-shrink:0}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}.welcome-card:hover .welcome-card-image img,.welcome-card:hover .welcome-arrow{transform:none}}

@media(max-width:400px){.topic-directory{grid-template-columns:minmax(0,1fr)}.topic-directory>a{display:grid;grid-template-columns:40% minmax(0,1fr);align-items:center}.topic-directory img{border-bottom:0;height:100%;object-fit:cover}.topic-directory h3{margin-bottom:6px}.board-menu button{flex-basis:150px}}
@media(max-width:680px){.section-tabs[aria-label="主题展览阅读方向"]{display:flex;flex-wrap:nowrap;gap:24px;overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;padding-bottom:0}.section-tabs[aria-label="主题展览阅读方向"] a{flex-shrink:0;white-space:nowrap;min-height:48px;padding-block:10px}}
.board-menu{overflow-y:hidden;scrollbar-width:thin}