/* 文化展馆前端设计规范 v1.1 · 长岗坡 / 单文件版 */
:root{
 --paper:#f5f2ea;--paper-deep:#ece6da;--ink:#292c27;--muted:#656b61;
 --accent:#a54334;--accent-dark:#883427;--secondary:#576d5f;
 --line:rgba(75,76,61,.18);--line-strong:#869080;--surface:rgba(255,254,248,.9);
 --shadow:0 16px 48px rgba(70,56,33,.06);--red:var(--accent);--sage:var(--secondary);
 --serif:'Songti SC','STSong','Noto Serif CJK SC','Noto Serif SC','SimSun',serif;
 --sans:'PingFang SC','Noto Sans CJK SC','Microsoft YaHei',sans-serif;
 --latin:Georgia,'Times New Roman',serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:14px;line-height:2;-webkit-font-smoothing:antialiased}
body::before{content:'';position:fixed;inset:0;pointer-events:none;opacity:.028;z-index:20;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}button,input,select{font:inherit;color:inherit}button,select{cursor:pointer}button{border:0;background:none}button:disabled,select:disabled,input:disabled{opacity:.42;cursor:not-allowed}
a,button,input,select,summary{outline-offset:4px;-webkit-tap-highlight-color:transparent}
:where(a,button,input,select,summary,canvas,[tabindex]):focus-visible{outline:2px solid var(--accent)}
button,a,select{transition:color .2s,background-color .2s,border-color .2s}button:active:not(:disabled){transform:translateY(1px)}
button{border-radius:2px}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.35;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle;flex-shrink:0}img{max-width:100%;display:block}
h1,h2,h3,p,figure{margin:0}h1,h2,h3,.serif{font-family:var(--serif);font-weight:500}h2{font-size:36px;line-height:1.55;letter-spacing:.04em}h3{font-size:24px;line-height:1.65}p+p{margin-top:16px}small{font-weight:400}strong{font-weight:500}
.wrap{width:min(1480px,86.6%);margin-inline:auto;min-width:0}main{outline:none}section{scroll-margin-top:24px}
[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:fixed;left:22px;top:-100px;z-index:250;background:var(--paper);padding:10px 20px;border:1px solid var(--accent)}.skip:focus{top:12px}
/* Header and footer: series master, kept in normal document flow. */
.site-header{height:105px;margin:0 5.25%;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px;position:relative;z-index:10}
.brand{display:flex;align-items:center;gap:13px;flex-shrink:0;white-space:nowrap}.brand-seal{width:49px;height:62px;display:flex;align-items:center;justify-content:center;flex-shrink:0;border-radius:2px;background:var(--accent)}
.brand-seal .brand-symbol{width:49px;height:61.25px;color:#faf2e1;stroke-width:1.3;overflow:visible}.brand-name{font-family:var(--serif);font-size:24px;letter-spacing:3.3px;line-height:1.3;white-space:nowrap}
.brand-name small{display:block;font:8px/1.4 var(--latin);letter-spacing:2.15px;margin-top:7px;color:var(--muted)}.brand-dot{display:inline-block;width:3px;height:3px;margin:0 9px 6px 7px;background:var(--accent);transform:rotate(45deg)}
.desktop-nav{display:flex;align-items:center;justify-content:center;gap:30px;flex:1;min-width:0}.nav-link{position:relative;font-size:13px;letter-spacing:1.5px;white-space:nowrap;min-height:44px;padding:12px 0}
.nav-link::after{content:'';height:3px;width:3px;border-radius:50%;background:var(--accent);position:absolute;bottom:4px;left:50%;opacity:0}.nav-link.active,.nav-link:hover{color:var(--accent)}.nav-link.active::after{opacity:1}
.header-right{display:flex;align-items:center;gap:20px;flex-shrink:0;white-space:nowrap}.museum-label{font-size:10px;letter-spacing:1.3px;color:var(--muted);display:flex;align-items:center;gap:8px}.live-dot{width:5px;height:5px;background:var(--secondary);border-radius:50%}
.header-home,.about-button{display:flex;align-items:center;gap:7px;min-width:44px;font-size:12px;min-height:44px;white-space:nowrap}.header-home{padding:6px 0}.about-button{padding:0 0 0 18px;position:relative}.about-button::before{content:'';position:absolute;left:0;top:14px;bottom:14px;width:1px;background:var(--line)}.about-button svg{width:15px;height:15px}
.site-footer{margin:0 5.25%;padding:26px 0 25px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.footer-wordmark{display:inline-flex;align-items:center;gap:12px;min-height:44px;font:20px/1.5 var(--serif);letter-spacing:2px}.footer-mark{width:34px;height:43px;color:var(--accent);stroke-width:1.3}.footer-wordmark>span small{display:block;font:7px/1.4 var(--latin);letter-spacing:2px;margin-top:5px;color:var(--muted)}
.footer-motto{font-size:11px;letter-spacing:1.5px;color:var(--muted)}.footer-source{display:flex;align-items:center;gap:12px;font-size:11px;color:var(--muted);letter-spacing:1px;min-height:44px}.footer-source svg{width:15px;height:15px}
.footer-meta{display:flex;justify-content:space-between;align-items:center;gap:12px 24px;flex-wrap:wrap;width:100%}.footer-links{display:flex;align-items:center;gap:24px}.footer-home-link{display:inline-flex;align-items:center;gap:7px;min-height:44px;font-size:11px;line-height:1.5;color:var(--muted)}.footer-home-link svg{width:13px;height:13px}
.footer-meta>small{font-size:10px;line-height:1.9;color:var(--muted);text-align:right;max-width:680px}.version-number{font-family:var(--latin);letter-spacing:.08em}
/* Open, horizontal introduction. */
.hero{padding-top:36px}.hero-heading{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:40px;margin-bottom:20px}
.eyebrow{display:flex;align-items:center;gap:12px;font:11px/1.65 var(--latin);letter-spacing:.14em;color:var(--secondary)}.eyebrow>span:empty{width:22px;height:1px;background:var(--accent);flex-shrink:0}
.title-line{display:flex;align-items:center;gap:22px;margin:12px 0 8px}h1{font-size:clamp(72px,5.4vw,88px);line-height:1.25;letter-spacing:.045em;white-space:nowrap}h1 span{margin-left:3px}
.title-stamp{font:13px/1.45 var(--serif);padding:5px 4px;border:1px solid var(--accent);color:var(--accent);transform:rotate(-3deg);flex-shrink:0}.english{font:11px/1.6 var(--latin);letter-spacing:.24em;color:var(--muted)}
.hero-intro{justify-self:end;max-width:370px;padding-top:16px}.hero-intro .serif{font-size:22px;line-height:1.6;letter-spacing:.05em}.hero-intro .serif br{display:none}.intro-small{font-size:12px;color:var(--muted);line-height:1.9;margin-top:10px}.hero-intro .text-link{margin-top:8px;font-size:11px;min-height:36px}
.text-link{display:inline-flex;align-items:center;gap:14px;min-height:44px;font-size:12px;padding:0;border-bottom:1px solid var(--line-strong);color:var(--secondary);margin-top:20px;max-width:100%}.text-link svg{width:17px;height:17px}.text-link:hover{border-color:var(--accent)}
/* No panel, no border, no background box around the model. */
.viewer{position:relative;border:0;border-radius:0;background:transparent;box-shadow:none;isolation:isolate;scroll-margin-top:20px}
.viewer-header{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:54px;padding:0 0 8px;border:0}.viewer-kicker{display:flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.04em;color:var(--secondary)}.status-dot{width:5px;height:5px;border-radius:50%;background:var(--secondary);flex-shrink:0}
.scale-switch{display:flex;gap:0;border:1px solid var(--line);border-radius:2px;padding:3px;background:rgba(255,254,248,.44)}.scale-switch button{min-height:38px;padding:7px 17px;font-size:11px;line-height:1.5}.scale-switch button[aria-pressed=true]{background:var(--secondary);color:var(--paper)}
.stage{height:clamp(400px,30.6vw,500px);position:relative;overflow:hidden;border:0;border-radius:0;background:transparent}
.stage::after{content:'';position:absolute;inset:0;z-index:3;pointer-events:none;background:linear-gradient(90deg,var(--paper),transparent 3.5%,transparent 96.5%,var(--paper)),linear-gradient(0deg,var(--paper),transparent 12%,transparent 97%,var(--paper))}
.stage canvas{display:block;width:100%;height:100%;position:relative;z-index:2;touch-action:pan-y;cursor:grab;outline-offset:-4px}.stage canvas:active{cursor:grabbing}.stage canvas.touch-active{touch-action:none}
.contour{position:absolute;pointer-events:none;left:-15%;top:48%;width:125%;height:200px;border:1px solid var(--secondary);border-radius:50%;opacity:.035;transform:rotate(-7deg)}.contour-two{top:53%;left:-10%;height:230px}
.stage-inscription{position:absolute;right:72px;top:30px;writing-mode:vertical-rl;font:11px/1.8 var(--serif);letter-spacing:.25em;color:var(--secondary);opacity:.5;z-index:1;pointer-events:none}
.stage-left{position:absolute;left:8px;top:12px;z-index:4;display:flex;flex-direction:column;gap:2px;pointer-events:none;max-width:calc(100% - 70px)}.section-tag{font-size:11px;letter-spacing:.06em;color:var(--secondary)}#view-caption{font-size:10px;color:var(--muted);line-height:1.75}
.stage-tools{position:absolute;right:4px;top:12px;z-index:5;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:2px;box-shadow:var(--shadow)}.stage-tools button{width:44px;height:44px;display:grid;place-items:center}.stage-tools button:hover{background:var(--paper-deep)}.stage-tools>span{margin:0 12px;border-top:1px solid var(--line)}.stage-tools svg{width:18px;height:18px}
.stage-bottom{position:absolute;inset:auto 8px 8px;display:flex;align-items:center;justify-content:space-between;gap:12px;pointer-events:none;z-index:5;font-size:10px;color:var(--muted)}#gesture-hint{display:flex;align-items:center;gap:7px}#gesture-hint svg{width:15px;height:15px}
#touch-mode{pointer-events:auto;display:none;min-height:44px;padding:7px 12px;border:1px solid var(--secondary);background:var(--surface);color:var(--secondary);font-size:12px;gap:7px;align-items:center}#touch-mode[aria-pressed=true]{background:var(--secondary);color:var(--paper)}#touch-mode svg{width:17px;height:17px}
.orientation{display:flex;align-items:center;gap:7px;white-space:nowrap}.orientation>span{display:none}.orientation .direction-line{width:56px;height:14px}.orientation small{font-size:10px;margin-left:2px}
.toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:60px;padding:7px 12px;border:1px solid var(--line);border-radius:2px;background:rgba(255,254,248,.52);margin-top:8px}
.view-controls,.explain-controls{display:flex;align-items:center;gap:4px;min-width:0}.toolbar button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:8px 12px;font-size:12px;line-height:1.7;white-space:nowrap}.toolbar button:hover{background:var(--paper-deep)}.toolbar button[aria-pressed=true]{color:var(--accent);background:rgba(165,67,52,.07)}.toolbar button[aria-pressed=true]::after{content:'';display:block;width:3px;height:3px;background:currentColor;border-radius:50%}
.toolbar select{font-size:12px;background:transparent;border:0;max-width:140px;min-height:44px;padding:8px 27px 8px 7px;border-radius:2px}.toolbar svg{width:17px;height:17px}.view-controls>label{display:flex;align-items:center;padding-left:2px}.view-controls>button{margin-left:12px;position:relative}.view-controls>button::before{content:'';height:17px;position:absolute;left:-7px;border-left:1px solid var(--line)}
.explore-strip{display:flex;align-items:center;gap:12px;padding:8px 0 0;min-height:54px;font-size:11px;color:var(--muted)}.explore-strip button{width:44px;height:44px;padding:12px;display:grid;place-items:center}.explore-strip button:hover{background:var(--paper-deep)}.explore-strip svg{width:17px;height:17px}.explore-strip input{width:clamp(150px,24vw,300px);height:44px;accent-color:var(--secondary);margin:0;cursor:pointer;min-width:0}.explore-strip output{width:94px;font-size:11px}.model-note-link{display:inline-flex;gap:6px;align-items:center;margin-left:auto;font-size:11px;min-height:44px}.model-note-link svg{width:16px;height:16px}
.under-stage{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;padding-top:12px;font-size:11px;color:var(--muted);line-height:1.85}.under-stage p{max-width:900px}.under-stage a{display:flex;align-items:center;gap:12px;white-space:nowrap;min-height:24px}.under-stage svg{width:15px;height:15px}.catalogue{font:10px var(--latin);letter-spacing:.14em;margin-right:10px;color:var(--accent)}
.hotspots{position:absolute;inset:0;z-index:4;pointer-events:none}.hotspot{pointer-events:auto;position:absolute;transform:translate(-50%,-50%);width:44px;height:44px;padding:0;display:grid;place-items:center;color:var(--secondary);font:12px var(--latin);isolation:isolate;border:0;background:transparent}.hotspot::before{content:'';position:absolute;inset:7px;border:1px solid var(--secondary);border-radius:2px;background:var(--surface);z-index:-1;transition:background .2s}.hotspot:hover,.hotspot:focus-visible{color:var(--paper)}.hotspot:hover::before,.hotspot:focus-visible::before{background:var(--secondary)}.hotspot:active:not(:disabled){transform:translate(-50%,-50%)}.hotspot span{pointer-events:none;position:absolute;bottom:calc(100% - 2px);padding:2px 7px;border:1px solid var(--line);border-radius:2px;background:var(--surface);color:var(--ink);white-space:nowrap;font:11px/1.8 var(--sans);opacity:0;transition:opacity .2s}.hotspot:hover span,.hotspot:focus-visible span{opacity:1}
.part-card{position:relative;display:grid;grid-template-columns:44px 1fr;gap:16px;margin-top:16px;padding:24px 64px 24px 24px;border:1px solid var(--line);border-radius:2px;background:#efeee5;scroll-margin-top:20px}.part-index{font:30px/1.4 var(--latin);color:var(--accent)}.part-card h3{font-size:24px;margin:4px 0 10px}.part-card p{max-width:760px;font-size:14px;line-height:2}.fine{font-size:12px;color:var(--muted)}.part-card p.fine{font-size:12px;margin-top:10px}.part-card .eyebrow{font-family:var(--sans);font-size:11px}.part-links{display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:12px;font-size:12px;color:var(--secondary)}.part-links a,.part-links button{display:inline-flex;align-items:center;gap:8px;padding:0;min-height:44px}.part-links svg{width:16px;height:16px}.card-close{position:absolute;right:8px;top:8px;width:44px;height:44px;display:grid;place-items:center}.card-close:hover{background:var(--paper-deep)}
.simulation-note{font-size:12px;color:var(--secondary);padding:12px 0;margin-top:12px;border-top:1px solid var(--line);line-height:1.9}
.cruise-hud{position:absolute;left:50%;bottom:58px;transform:translateX(-50%);background:var(--surface);color:var(--secondary);border:1px solid var(--line);border-radius:2px;box-shadow:var(--shadow);display:flex;align-items:center;gap:8px;padding:4px 4px 4px 16px;z-index:6;font-size:11px;max-width:calc(100% - 28px)}.cruise-hud button{width:44px;height:44px;padding:10px;flex-shrink:0}.cruise-hud button:hover{background:var(--paper-deep)}
.loading{position:absolute;inset:0;z-index:8;background:var(--paper);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:16px}.loading p{font:22px/1.6 var(--serif)}.loading small{font-size:11px;color:var(--muted)}.loading progress{width:180px;height:3px;accent-color:var(--secondary)}.loading .loading-mark{width:42px;height:53px;color:var(--accent)}
.fallback{position:absolute;inset:0;z-index:7;padding:32px 16px;display:grid;grid-template-columns:1.2fr 1fr;align-items:center;gap:32px;background:var(--paper)}.fallback .serif{font-size:24px}.fallback p:not(.serif){font-size:13px;color:var(--muted)}.fallback .text-link{margin:16px 20px 0 0}.viewer.is-fallback .stage-left,.viewer.is-fallback .stage-inscription,.viewer.is-fallback .stage-bottom{visibility:hidden}
.overview-points{position:absolute;inset:0;z-index:4;pointer-events:none}.overview-points>span{position:absolute;transform:translate(-50%,-100%);text-align:center;font:15px/1.5 var(--serif);color:var(--secondary);white-space:nowrap}.overview-points>span::after{content:'';position:absolute;left:50%;top:calc(100% + 5px);width:1px;height:16px;background:var(--line-strong)}.overview-points small{font:10px/1.8 var(--sans);display:block;margin-top:4px}
.overview-info{position:absolute;left:12px;bottom:52px;z-index:4;pointer-events:none;padding:12px 16px;background:rgba(245,242,234,.84);border-left:1px solid var(--line)}.overview-info>.serif{font:28px/1.4 var(--latin);margin:8px 0;display:flex;align-items:baseline;gap:6px;color:var(--secondary)}.overview-info .serif small{font:11px var(--sans)}.overview-info .serif>span{width:1px;height:17px;background:var(--line);margin:0 12px}.overview-info>p:last-child{font-size:11px;color:var(--muted);margin:0;line-height:1.75}
.overview-legend{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:8px 0;font-size:12px;color:var(--secondary)}.overview-legend button{display:flex;align-items:center;gap:10px;font-size:12px;white-space:nowrap;min-height:44px;padding:0}.overview-legend .fine{font-size:11px}.overview-legend a{color:var(--accent)}
/* Fullscreen uses the same scene; reading cards remain below, not on top. */
.viewer:fullscreen,.viewer.immersive{background:var(--paper);display:flex;flex-direction:column;border:0;padding:12px 24px;width:100%;height:100%;height:100dvh;overflow:auto}
.viewer.immersive{position:fixed;inset:0;z-index:200}.viewer:fullscreen .stage,.viewer.immersive .stage{flex:1 1 auto;height:auto;min-height:140px}.viewer:fullscreen .viewer-header,.viewer.immersive .viewer-header{min-height:48px;flex-shrink:0}.viewer:fullscreen .toolbar,.viewer.immersive .toolbar{flex-shrink:0}.viewer:fullscreen .part-card,.viewer.immersive .part-card{flex-shrink:0;max-height:30vh;overflow:auto;margin-top:8px;padding-block:16px}.viewer:fullscreen .explore-strip,.viewer.immersive .explore-strip{flex-shrink:0}.viewer:fullscreen .simulation-note,.viewer.immersive .simulation-note{padding:4px 0;margin-top:4px;flex-shrink:0}
/* Documents, history and structural interpretation. */
.facts{display:flex;align-items:center;gap:48px;margin-top:32px;padding:28px 0;border-block:1px solid var(--line)}.facts-label{display:flex;align-items:center;gap:10px;font-size:11px;letter-spacing:.08em;white-space:nowrap;color:var(--secondary)}.facts-label svg{width:22px;height:22px}.facts dl{margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:32px;width:100%}.facts dt{font-size:11px;color:var(--muted);margin-bottom:4px}.facts dd{font:36px/1.2 var(--latin);white-space:nowrap;margin:0}.facts dd small{font:11px var(--sans);margin-left:7px}.facts dd a{font:10px var(--sans);vertical-align:top;margin-left:5px;color:var(--accent)}
.chapter{padding-top:80px;padding-bottom:80px}.chapter-heading{display:flex;align-items:center;gap:24px;margin-bottom:40px}.chapter-number{font:22px/1.4 var(--serif);color:var(--accent);width:36px;flex-shrink:0;align-self:flex-start;margin-top:23px}.chapter-heading h2{margin-top:8px}.chapter-heading>p{margin-left:auto;max-width:330px;font-size:12px;color:var(--muted);line-height:1.9}.chapter-heading .eyebrow{font-size:10px}
.history-grid{display:grid;grid-template-columns:.85fr 1.5fr;gap:64px;align-items:center}.lead-story{max-width:420px}.lead-story .lead{font:28px/1.7 var(--serif);margin-bottom:24px}.lead-story>p:not(.lead){font-size:14px;color:#535c52;line-height:2}
.ref{font:11px var(--latin);color:var(--accent);margin:0 3px;white-space:nowrap}.field-figure{position:relative;padding:40px 8px 8px;min-width:0;background:rgba(87,109,95,.035)}.field-figure img{width:100%;height:auto;min-height:200px;object-fit:contain}.field-figure figcaption{padding:12px 12px 0;display:flex;justify-content:space-between;gap:16px;font-size:11px;color:var(--muted);border-top:1px solid var(--line);margin-top:12px;line-height:1.8}.figure-focus{position:absolute;right:16px;top:0;display:flex;align-items:center;gap:8px;font-size:11px;color:var(--secondary);min-height:44px}.figure-focus svg{width:16px;height:16px}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:56px}.timeline article{padding-right:32px;position:relative}.timeline time{font:32px/1.5 var(--latin);color:var(--secondary)}.timeline time small{font:11px var(--sans);margin-left:8px;color:var(--muted)}.timeline article>span{display:block;height:1px;background:var(--line);position:relative;margin:16px -32px 20px 0}.timeline article>span::before{content:'';width:5px;height:5px;position:absolute;left:0;top:-2px;background:var(--secondary);border-radius:50%}.timeline h3{font-size:22px;margin-bottom:10px}.timeline p{font-size:13px;line-height:2;color:var(--muted)}
.engineering{padding:72px 0 56px;background:rgba(87,109,95,.045)}.engineering .chapter-heading{margin-bottom:32px}.flow-intro{display:grid;grid-template-columns:1fr 1.6fr;gap:56px;align-items:center}.flow-intro .serif{font-size:26px;line-height:1.7}.flow-intro p:not(.serif){font-size:14px;color:#536152;line-height:2}.flow-intro img{width:100%;height:auto}.structure-list{display:grid;grid-template-columns:repeat(4,1fr);margin-top:40px;border-block:1px solid var(--line);padding-block:24px}.structure-list button{display:flex;align-items:center;gap:16px;text-align:left;padding:8px 24px;border-right:1px solid var(--line);border-radius:0;min-width:0}.structure-list button:first-child{padding-left:0}.structure-list button:last-child{border:0}.structure-list button:hover{background:rgba(87,109,95,.055)}.item-number{font:14px/1.6 var(--latin);color:var(--secondary);align-self:flex-start;margin-top:6px}.structure-list strong{font:24px/1.5 var(--serif);display:block}.structure-list small{display:block;font-size:11px;line-height:1.8;color:var(--muted);margin-top:5px}.structure-list svg{margin-left:auto;width:17px;height:17px}.engineering-bottom{display:flex;align-items:center;justify-content:space-between;gap:32px;margin-top:24px;font-size:12px;color:#536152}.engineering-bottom p{max-width:740px}.engineering-bottom .text-link{margin-top:0;white-space:nowrap}
.memory-grid{display:grid;grid-template-columns:.85fr 1.35fr;gap:80px;align-items:start}.memory-visual{padding:24px;text-align:center;background:rgba(121,106,77,.035)}.memory-visual .eyebrow{justify-content:center}.memory-visual img{width:100%;height:240px;object-fit:contain}.memory-visual .serif{font-size:24px;line-height:1.7;color:var(--secondary)}
summary{cursor:pointer;list-style:none}summary::-webkit-details-marker{display:none}.stories details{border-bottom:1px solid var(--line)}.stories details:first-child{border-top:1px solid var(--line)}.stories summary{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:24px 0;font:23px/1.6 var(--serif);min-height:92px}.stories summary small{display:block;width:fit-content;max-width:100%;font:10px/1.7 var(--sans);letter-spacing:.07em;color:var(--secondary);margin-bottom:7px}.stories summary svg{width:18px;height:18px;transition:transform .2s}.stories details[open] summary svg{transform:rotate(45deg)}.story-body{padding-bottom:24px;font-size:14px;line-height:2;color:#555e53;max-width:760px}.story-body .text-link{font-size:12px;margin-top:12px}
.impact{display:grid;grid-template-columns:.85fr 1.35fr;gap:80px;padding:40px 0 80px;border-top:1px solid var(--line)}.impact h2{font-size:34px;margin-top:12px}.impact>div+div{font-size:14px;line-height:2;color:#555e53;padding-top:12px}.data-note{margin-top:24px;border-top:1px solid var(--line);padding-top:12px;font-size:13px}.data-note summary{display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--secondary);min-height:44px}.data-note summary svg{width:17px;height:17px}.data-note p{margin-top:12px;font-size:13px;line-height:2}
.visit-section{padding:72px 0;background:rgba(121,106,77,.035);border-block:1px solid var(--line)}.visit-grid{display:grid;grid-template-columns:1.2fr .9fr;gap:80px}.visit-section h2{font-size:36px;margin-top:12px;margin-bottom:24px}.visit-section p{font-size:14px;color:#555e53;line-height:2}.visit-section .fine{font-size:12px;max-width:600px;color:var(--muted)}
.primary{display:inline-flex;align-items:center;gap:24px;min-height:46px;padding:11px 20px;margin-top:24px;background:var(--accent);color:var(--paper);border:1px solid var(--accent);border-radius:2px;font-size:12px}.primary:hover{background:var(--accent-dark);border-color:var(--accent-dark);color:var(--paper)}.primary svg{width:17px;height:17px}
.visit-note{padding:24px 0 24px 40px;border-left:1px solid var(--line);align-self:center}.visit-icon{width:28px;height:28px;color:var(--secondary);margin-bottom:16px}.visit-note h3{font-size:24px;margin-bottom:16px}.visit-divider{border-top:1px solid var(--line);margin-top:24px}.visit-note .text-link{font-size:12px;display:flex;width:max-content}
.reference-strip{padding-top:72px;display:grid;grid-template-columns:.7fr 1.5fr;gap:56px}.reference-strip h2{font-size:34px;margin:10px 0 20px}.reference-strip p:last-child{font-size:12px;line-height:1.9;color:var(--muted)}.reference-links{display:grid;grid-template-columns:1fr 1fr;gap:24px 32px}.reference-links>a{position:relative;border-top:1px solid var(--line);padding:16px 28px 12px 0}.reference-links>a>span{font:18px/1.5 var(--latin);color:var(--accent);display:flex;align-items:center;gap:12px}.reference-links>a>span small{font:11px var(--sans);color:var(--secondary)}.reference-links strong{display:block;font:22px/1.6 var(--serif);margin:12px 0 8px}.reference-links>a>small{display:block;font-size:10px;color:var(--muted);line-height:1.8}.reference-links>a>svg{position:absolute;right:0;top:19px;width:15px;height:15px}.reference-links>a:hover{border-color:var(--accent)}
.notes{padding-top:80px;padding-bottom:48px}.notes-heading{max-width:850px;margin-bottom:24px}.notes-heading h2{font-size:34px;margin:8px 0 16px}.notes-heading>p:last-child{font-size:14px;line-height:2;color:var(--muted);max-width:760px}.notes details{border-top:1px solid var(--line)}.notes details:last-child{border-bottom:1px solid var(--line)}.notes summary{display:flex;justify-content:space-between;align-items:center;gap:24px;font-size:14px;padding:20px 0;min-height:64px}.notes summary svg{width:17px;height:17px;transition:transform .2s}.notes details[open] summary svg{transform:rotate(180deg)}.note-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding:4px 0 28px;color:var(--muted);font-size:13px;line-height:2}.note-grid h3{font:22px/1.6 var(--serif);color:var(--secondary);margin-bottom:12px}.note-grid>p{margin:0}
.sources{display:grid;grid-template-columns:.6fr 1.5fr;gap:64px;padding:24px 0 72px}.sources h2{font-size:34px;margin:8px 0 20px}.sources-title>p:last-child{font-size:12px;line-height:1.9;color:var(--muted)}#source-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:28px 32px}#source-list li{border-top:1px solid var(--line);padding-top:16px;scroll-margin-top:32px;min-width:0}#source-list li:target{background:#eaece2;outline:8px solid #eaece2}#source-list .source-number{font:12px var(--latin);color:var(--accent);margin-right:7px}#source-list a{display:block;font-size:13px;line-height:1.9;color:var(--secondary);overflow-wrap:anywhere}#source-list a:hover{color:var(--accent)}#source-list a svg{width:13px;height:13px;margin-left:5px}#source-list small{display:block;font:11px/1.8 var(--latin);color:var(--muted);margin:7px 0}#source-list p{font-size:12px;color:var(--muted);line-height:2}
/* Accessible paper dialog; no automatic entry popup. */
.about-dialog{width:min(760px,calc(100% - 48px));max-height:calc(100vh - 72px);max-height:calc(100dvh - 72px);margin:auto;padding:0;border:1px solid var(--line);border-radius:3px;box-shadow:var(--shadow);background:var(--paper);color:var(--ink);overflow:auto;overscroll-behavior:contain}.about-dialog:not([open]){display:none}.about-dialog::backdrop{background:rgba(41,44,39,.36)}.about-dialog.dialog-fallback{position:fixed;inset:0;z-index:240;box-shadow:0 0 0 100vmax rgba(41,44,39,.36)}
.dialog-header{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 32px 20px;background:var(--paper);border-bottom:1px solid var(--line)}.dialog-header h2{font:30px/1.4 var(--serif);letter-spacing:.03em;margin-top:5px}.dialog-header .eyebrow{font-size:10px}.dialog-close{width:44px;height:44px;padding:12px;flex-shrink:0}.dialog-close:hover{background:var(--paper-deep)}.dialog-content{padding:28px 32px 32px}.dialog-content>p{font-size:14px;line-height:2}.dialog-content .dialog-lead{font:22px/1.7 var(--serif);margin-bottom:16px}.dialog-section{margin-top:28px;padding-top:24px;border-top:1px solid var(--line);scroll-margin-top:130px}.dialog-section h3{font-size:23px;margin-bottom:12px}.dialog-section p{font-size:13px;line-height:2;color:var(--muted)}.data-tag{display:inline-flex;align-items:center;font:10px/1.7 var(--sans);letter-spacing:.04em;padding:2px 7px;border:1px solid var(--line);border-radius:2px;color:var(--secondary);margin-bottom:10px}
.dialog-links{display:flex;flex-wrap:wrap;gap:12px 28px}.dialog-links .text-link{margin-top:10px}.dialog-source-list{list-style:none;margin:16px 0 0;padding:0}.dialog-source-list li{padding:12px 0;border-top:1px solid var(--line);font-size:12px;line-height:1.9}.dialog-source-list a{display:flex;align-items:flex-start;gap:10px;color:var(--secondary);padding:4px 0;min-height:36px;overflow-wrap:anywhere}.dialog-source-list a svg{width:14px;height:14px;margin-top:4px;margin-left:auto}.dialog-source-list small{display:block;font:11px/1.8 var(--latin);color:var(--muted)}.dialog-source-list .source-number{font-family:var(--latin);color:var(--accent);flex-shrink:0}.dialog-end{margin-top:28px;padding-top:20px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px}.dialog-end small{font-size:11px;color:var(--muted)}.dialog-end .primary{margin:0;white-space:nowrap}
.operation-help{margin-top:12px}.operation-help summary{display:inline-flex;align-items:center;gap:8px;font-size:11px;color:var(--muted);min-height:44px}.operation-help summary svg{width:16px;height:16px}.operation-help[open] summary{color:var(--secondary)}.operation-help>div{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;font-size:12px;color:var(--muted);padding:12px 0 20px;border-bottom:1px solid var(--line)}.operation-help strong{display:block;color:var(--secondary);font-size:12px;margin-bottom:4px}.operation-help p{margin:0;line-height:2}kbd{font:11px var(--latin);padding:1px 4px;border:1px solid var(--line);border-radius:2px}
.toast{position:fixed;bottom:max(24px,env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);padding:12px 20px;max-width:calc(100% - 44px);background:#344b3f;color:var(--paper);border-radius:2px;box-shadow:var(--shadow);font-size:12px;line-height:1.9;z-index:250;pointer-events:none}
/* Shared breakpoints: 1480 / 1150 / 850 / 700 / 360. */
@media(min-width:1480px){.hero{padding-top:40px}.hero-heading{margin-bottom:24px}.stage{height:clamp(455px,28vw,520px)}}
@media(max-width:1150px){.site-header{height:93px;gap:20px}.brand-seal,.brand-seal .brand-symbol{width:44px;height:55px}.brand-name{font-size:22px;letter-spacing:2.8px}.brand-name small{font-size:7px;letter-spacing:2px}.desktop-nav{gap:20px}.nav-link{font-size:12px;letter-spacing:1px}.header-right{gap:18px}.header-right .museum-label{display:none}.header-home,.about-button{font-size:11px}.brand-dot{margin-left:5px;margin-right:8px}.hero-heading{gap:24px}.hero-intro{max-width:300px}.hero-intro .serif{font-size:20px}.intro-small{font-size:12px}h1{font-size:72px;letter-spacing:.025em}.title-line{gap:16px}.facts-label{display:none}.facts dl{gap:24px}.history-grid{gap:40px}.chapter-heading>p{max-width:260px}.toolbar{padding:6px 8px;gap:6px}.toolbar button{font-size:11px;padding:8px 10px;gap:6px}.view-controls>button{margin-left:8px}.toolbar select{font-size:11px;max-width:126px}.structure-list button{padding-inline:16px;gap:12px}.structure-list small{font-size:10px}.memory-grid,.impact{gap:48px}.visit-grid{gap:48px}.visit-note{padding-left:32px}.reference-strip{gap:40px}.sources{gap:40px}}
@media(max-width:850px){.site-header{gap:16px}.brand-name{font-size:21px;letter-spacing:2px}.brand-name small{letter-spacing:1.4px}.brand{gap:10px}.desktop-nav{gap:12px}.nav-link{font-size:11px;letter-spacing:0}.header-right{gap:12px}.header-home,.about-button{font-size:10px}.about-button{padding-left:12px;gap:4px}.about-button svg{width:12px;height:12px}.hero-heading{grid-template-columns:1fr;gap:14px}.hero-intro{display:flex;align-items:center;justify-content:space-between;justify-self:stretch;max-width:none;padding:0;gap:16px}.hero-intro .serif{font-size:20px;white-space:nowrap}.hero-intro .intro-small{display:none}.hero-intro .text-link{margin:0;min-height:44px}.stage{height:410px}.chapter-heading>p{display:none}.history-grid{gap:32px;grid-template-columns:1fr 1.2fr}.lead-story .lead{font-size:25px}.flow-intro{gap:32px;grid-template-columns:1fr 1.2fr}.flow-intro .serif{font-size:24px}.toolbar{flex-wrap:wrap;padding:6px 10px}.view-controls,.explain-controls{flex:1;justify-content:center}.view-controls{border-right:1px solid var(--line)}.view-controls>button{margin-left:0}.view-controls>button::before{display:none}.toolbar button{padding-inline:8px}.explain-controls{gap:0}.explain-controls button{gap:5px}.structure-list{grid-template-columns:1fr 1fr;gap:0;padding:12px 0}.structure-list button{padding:16px 20px!important;border:0}.structure-list button:nth-child(odd){border-right:1px solid var(--line)}.structure-list button:nth-child(-n+2){border-bottom:1px solid var(--line)}.memory-grid{gap:32px;grid-template-columns:.8fr 1.2fr}.memory-visual{padding:20px 12px}.memory-visual img{height:220px}.memory-visual .serif{font-size:22px}.stories summary{font-size:22px}.timeline h3{font-size:21px}.timeline article{padding-right:24px}.timeline article>span{margin-right:-24px}.timeline p{font-size:13px}.impact{gap:32px}.visit-grid{gap:32px;grid-template-columns:1.15fr 1fr}.visit-section h2{font-size:34px}.visit-note{padding-left:24px}.reference-strip{grid-template-columns:1fr;gap:28px}.reference-strip>div:first-child{max-width:600px}.reference-links strong{font-size:22px}.sources{display:block}.sources-title{margin-bottom:32px}.sources-title>p:last-child{margin-top:12px}.note-grid{gap:24px}.note-grid h3{font-size:21px}.footer-meta>small{max-width:520px}.operation-help>div{gap:20px}}
@media(max-width:700px){
 html{scroll-padding-top:20px}body{font-size:14px}.wrap{width:calc(100% - 44px)}
 .site-header{height:79px;margin:0 22px;gap:12px}.brand{gap:10px}.brand-seal,.brand-seal .brand-symbol{width:38px;height:48px}.brand-name{font-size:21px;letter-spacing:2.7px}.brand-name small{font-size:6.5px;letter-spacing:1.8px;margin-top:5px}.brand-place,.brand-dot{display:none}.desktop-nav{display:none}.header-right{gap:12px;margin-left:auto}.header-home,.about-button{font-size:10px;min-height:44px;min-width:44px;justify-content:center}.about-button{padding:0;gap:4px}.about-button::before{display:none}.about-button svg{width:12px;height:12px}.museum-label{display:none}
 .hero{padding-top:24px}.hero-heading{display:block;margin-bottom:14px}.hero .eyebrow{font-family:var(--sans);font-size:10px;letter-spacing:.06em;gap:9px}.hero .eyebrow>span:empty{width:17px}.title-line{gap:14px;margin:12px 0 8px}h1{font-size:52px;letter-spacing:.025em;line-height:1.25}h1 span{margin-left:0}.title-stamp{font-size:10px;padding:3px;line-height:1.45}.english{font-size:9px;letter-spacing:.19em}.hero-intro{display:flex;align-items:center;gap:10px;margin-top:12px}.hero-intro .serif{font-size:17px;line-height:1.75;letter-spacing:.02em}.hero-intro .text-link{font-size:10px;gap:5px;min-height:36px;white-space:nowrap}.hero-intro .text-link svg{width:13px;height:13px}
 .viewer-header{gap:8px;min-height:54px;padding-bottom:6px}.viewer-kicker{font-size:10px;letter-spacing:0;gap:6px;max-width:126px;line-height:1.7}.scale-switch{padding:2px}.scale-switch button{min-height:44px;font-size:10px;padding:7px 11px}.stage{height:420px;height:clamp(385px,49.5svh,460px);margin-inline:-8px}.stage::after{background:linear-gradient(90deg,var(--paper),transparent 4%,transparent 96%,var(--paper)),linear-gradient(0deg,var(--paper),transparent 12%,transparent 98%,var(--paper))}.stage-left{left:10px;top:9px;max-width:calc(100% - 68px)}.section-tag{font-size:10px}.stage-left #view-caption{font-size:10px}.stage-inscription{display:none}.stage-tools{top:auto;bottom:58px;right:10px;flex-direction:row}.stage-tools>span{border-top:0;border-left:1px solid var(--line);height:18px;align-self:center;margin:0}.stage-tools button{width:44px;height:44px}.stage-tools svg{width:17px;height:17px}.stage-bottom{left:10px;right:10px;bottom:6px;gap:8px}#gesture-hint{display:none}#touch-mode{display:flex;font-size:11px;padding:7px 9px;gap:6px}.orientation{font-size:10px;gap:4px}.orientation .direction-line{width:28px}.orientation small{font-size:9px;margin-left:0}
 .toolbar{display:block;padding:4px 6px;margin-top:12px}.view-controls,.explain-controls{justify-content:space-between;gap:0;border:0}.view-controls{border-bottom:1px solid var(--line)}.view-controls>label{padding-left:5px}.toolbar button{min-height:44px;font-size:11px;padding:8px 7px;gap:6px}.toolbar svg{width:16px;height:16px}.toolbar button[aria-pressed=true]::after{display:none}.view-controls>button{margin:0}.toolbar select{max-width:145px;min-height:44px;font-size:12px;padding-inline:5px 20px}.explain-controls{display:grid;grid-template-columns:repeat(3,1fr)}.explain-controls button{width:100%;padding-inline:4px;font-size:11px}.explain-controls .motion-label{font-size:11px}.explore-strip{gap:4px;flex-wrap:wrap;padding-top:4px;min-height:54px}.explore-strip>span{font-size:10px;min-width:40px}.explore-strip button{width:44px;flex-shrink:0;padding:12px}.explore-strip input{flex:1 1 58px;width:58px;min-width:45px}.explore-strip output{width:68px;font-size:10px}.model-note-link{margin-left:0;min-height:36px;font-size:10px}.under-stage{font-size:11px;line-height:1.9;display:block;padding-top:6px}.under-stage a{display:inline-flex;min-height:36px;font-size:11px}.catalogue{font-size:9px;margin-right:8px}.operation-help{margin-top:0}.operation-help>div{grid-template-columns:1fr;gap:14px;padding-block:8px 20px}.operation-help summary{font-size:11px}
 .hotspot{width:44px;height:44px;font-size:12px}.hotspot span{display:none}.part-card{padding:20px 44px 20px 14px;grid-template-columns:24px 1fr;gap:10px;margin-top:12px}.part-index{font-size:22px}.part-card h3{font-size:22px;margin-top:6px}.part-card p{font-size:14px}.part-card p.fine{font-size:12px}.part-links{gap:4px 20px;font-size:12px}.card-close{right:1px;top:4px}.simulation-note{font-size:11px;line-height:1.9}.cruise-hud{bottom:112px;padding-left:10px;gap:2px;font-size:10px;width:max-content}.cruise-hud button{width:44px}.fallback{padding:32px 16px 16px;display:flex;flex-direction:column;justify-content:center;gap:16px}.fallback img{height:155px;width:100%;object-fit:contain}.fallback .serif{font-size:21px;line-height:1.6}.fallback p:not(.serif){font-size:12px;line-height:1.9}.fallback .text-link{font-size:12px;margin-top:8px;margin-right:16px}.loading p{font-size:21px}.loading small{font-size:10px}
 .overview-info{left:10px;bottom:118px;padding:10px 12px;max-width:calc(100% - 22px)}.overview-info>.serif{font-size:25px;margin-block:7px}.overview-info .eyebrow{font-size:9px}.overview-info>p:last-child{font-size:10px}.overview-points>span{font-size:13px}.overview-points small{font-size:9px}.overview-legend{display:block;font-size:11px;padding:10px 0}.overview-legend button{font-size:12px}.overview-legend .fine{font-size:10px}
 .facts{margin-top:24px;padding:24px 0;gap:0}.facts dl{grid-template-columns:1fr 1fr;gap:24px 20px}.facts dl>div{border-left:1px solid var(--line);padding-left:14px}.facts dt{font-size:11px}.facts dd{font-size:32px}.facts dd small{font-size:10px;margin-left:5px}.facts dd a{font-size:10px}
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