/* System fonts keep this exhibit free of third-party asset requests. */
:root{--paper:#f6f6f2;--ink:#20231f;--muted:#63665e;--line:#d7d9d0;--orange:#df421f;--dark:#202b28;--lime:#d3ec9e;--mono:'IBM Plex Mono',monospace;--sans:'DM Sans',Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.5}button,a,input{touch-action:manipulation}button,input{font:inherit}button{cursor:pointer}a{color:inherit;text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}button:disabled{cursor:default;opacity:.35}.skip{position:fixed;left:12px;top:-80px;padding:10px;background:white;z-index:10}.skip:focus{top:12px}.masthead{height:86px;border-bottom:1px solid var(--line);padding:0 40px;display:flex;align-items:center;gap:32px}.brand{font-weight:700;font-size:17px;letter-spacing:.04em;display:flex;align-items:center;gap:12px;text-decoration:none;white-space:nowrap}.brand-mark{display:grid;place-items:center;background:var(--orange);color:white;width:39px;height:39px;font-size:21px;letter-spacing:-.1em;padding-right:3px}.brand-rule{height:20px;width:1px;background:var(--line);margin-left:17px}.mast-note{font-size:13px;color:var(--muted)}.text-button{margin-left:auto;border:0;background:none;padding:12px 0;font-size:14px;white-space:nowrap}.small-cross{font-size:22px;margin-left:16px}.page-shell{max-width:1680px;margin:auto;display:grid;grid-template-columns:205px 1fr}.chapter-rail{padding:40px 25px 30px 40px;border-right:1px solid var(--line);display:flex;flex-direction:column}.rail-label,.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.09em}.rail-label{color:var(--muted);margin-bottom:26px}.chapter-rail nav{display:grid;gap:4px}.chapter-link{border:0;text-align:left;color:var(--muted);background:none;padding:10px 0;font-size:14px;display:flex;align-items:center;gap:15px;line-height:1.2}.chapter-link span{font:12px var(--mono);width:20px}.chapter-link[aria-current="step"]{color:var(--orange);font-weight:700}.chapter-link[aria-current="step"] span{border-bottom:2px solid var(--orange);padding-bottom:3px}.rail-bottom{font-size:12px;color:var(--muted);margin-top:auto;padding-top:40px}main{padding:33px 44px 0;min-width:0}.chapter-meta{display:flex;justify-content:space-between;gap:20px;font:12px var(--mono);letter-spacing:.07em;color:var(--muted);margin-bottom:34px}.chapter-meta span:first-child{color:var(--orange)}.story-grid{display:grid;grid-template-columns:1fr 1.08fr;gap:40px;align-items:start;min-height:415px}.story-copy{padding:4px 0 14px}h1{font-weight:500;font-size:clamp(42px,4.8vw,72px);letter-spacing:-.065em;line-height:1.01;margin:0 0 25px;max-width:650px}h1 em{font-style:normal;color:var(--orange)}.dek{font-size:19px;line-height:1.6;max-width:500px;color:#4d5249;margin:0 0 22px}.detail-copy{font-size:15px;line-height:1.65;max-width:500px;margin:0 0 20px;color:var(--muted)}.chapter-kicker{font:12px var(--mono);color:var(--muted);display:flex;align-items:center;gap:12px;margin-top:30px}.chapter-kicker:before{content:'';width:26px;height:2px;background:var(--orange)}.demo{background:var(--dark);color:var(--paper);padding:26px 28px;min-height:388px;position:relative;overflow:hidden}.demo-label{display:flex;justify-content:space-between;gap:16px;font:11px var(--mono);letter-spacing:.05em;color:#bbc7c0;margin-bottom:20px}.demo h3{font-size:21px;font-weight:500;letter-spacing:-.02em;margin:0 0 16px}.demo-caption{font-size:13px;line-height:1.55;color:#c2cdc4;margin:20px 0 0}.demo-controls{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}.demo button{background:transparent;border:1px solid #728177;color:#fff;padding:8px 13px;font-size:13px}.demo button.active,.demo button:hover{background:var(--lime);color:var(--dark);border-color:var(--lime)}.demo input[type=range]{width:100%;accent-color:var(--lime);margin:16px 0}.demo label{font-size:14px}.readout{font:500 60px/1.15 var(--mono);letter-spacing:-.055em;color:var(--lime)}.readout small{font-size:20px;letter-spacing:0}.demo-note{font:11px var(--mono);color:#b8c3ba;margin:10px 0}.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;border-top:1px solid var(--line);padding-top:19px;margin-top:25px}.timeline-item{position:relative}.timeline-item:before{content:'';position:absolute;width:6px;height:6px;background:var(--orange);top:-23px;left:0}.timeline time{font:500 16px var(--mono);color:var(--orange)}.timeline h3{font-size:15px;margin:6px 0;font-weight:600}.timeline p{font-size:13px;color:var(--muted);margin:0;line-height:1.5}.chapter-footer{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:28px 0 25px;margin-top:20px;border-top:1px solid var(--line)}.nav-button{padding:11px 20px;border:1px solid var(--line);background:transparent;font-size:14px}.nav-button.primary{background:var(--orange);border-color:var(--orange);color:white}.page-status{display:flex;gap:18px;align-items:center;font:12px var(--mono)}.key-hint{color:var(--muted);font-size:11px}.site-footer{border-top:1px solid var(--line);padding:15px 40px;display:flex;justify-content:space-between;gap:20px;font:10px var(--mono);color:var(--muted);letter-spacing:.03em}.intro-dots{display:grid;grid-template-columns:repeat(20,1fr);gap:7px;margin:26px 0 30px;min-height:144px;align-content:center}.intro-dots i{display:block;width:7px;height:7px;border-radius:50%;background:#d3ec9e;transition:transform .6s,opacity .6s}.intro-dots i:nth-child(3n){background:#8caba0}.intro-dots i:nth-child(5n){background:#ee7455}.intro-dots.grouped{grid-template-columns:repeat(20,1fr);align-content:end}.intro-dots.grouped i{border-radius:0}.intro-dots.grouped i:nth-child(n+101){opacity:.2}.intro-stat{display:flex;justify-content:space-between;align-items:baseline;border-top:1px solid #607066;padding-top:14px}.intro-stat b{font:44px var(--mono);color:var(--lime);letter-spacing:-.05em}.intro-stat span{font:12px var(--mono);color:#c0c9c1}.source-inline{background:none;border:0;border-bottom:1px solid var(--line);padding:0 0 2px;font-size:13px;color:var(--muted)}dialog{width:min(860px,calc(100% - 32px));max-height:88vh;border:0;padding:35px;background:var(--paper);color:var(--ink)}dialog::backdrop{background:rgba(16,27,22,.7);backdrop-filter:blur(4px)}.dialog-head{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:20px}.dialog-head h2{font-size:35px;letter-spacing:-.045em;margin:5px 0 0;font-weight:500}.close-button{background:transparent;border:1px solid var(--line);width:42px;height:42px;font-size:28px}.source-group{padding:20px 0;border-top:1px solid var(--line)}.source-group h3{margin:0 0 10px;font-size:20px}.source-group p,.source-group li{font-size:14px;line-height:1.6;color:var(--muted)}.source-group li{margin:10px 0}.source-group a{color:var(--ink)}.method-note{font-size:15px;line-height:1.7}.plot{width:100%;height:185px;display:block}.plot text{font:12px var(--mono);fill:#c1cfc5}.data-bars{display:grid;gap:16px;margin:25px 0}.bar-row{display:grid;grid-template-columns:95px 1fr 55px;gap:10px;align-items:center;font:12px var(--mono)}.bar-track{height:21px;background:#36443c}.bar-fill{height:100%;background:var(--lime);min-width:2px;transition:width .35s}.bar-row:nth-child(2) .bar-fill{background:#eb7a5e}.mini-table{width:100%;border-collapse:collapse;font-size:13px}.mini-table th,.mini-table td{padding:9px 0;border-bottom:1px solid #506154;text-align:left}.mini-table td:last-child,.mini-table th:last-child{text-align:right}.result-box{border-top:1px solid #68796c;margin-top:20px;padding-top:15px}.result-box p{font-size:14px;margin:8px 0 0}.formula{font:12px/1.7 var(--mono);color:#cad8ce;margin:14px 0}.station-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.station-grid button{min-height:72px;display:grid;gap:2px}.station-grid b{font:22px var(--mono)}.station-grid span{font-size:11px}.sample-dots{display:grid;grid-template-columns:repeat(20,1fr);gap:5px;margin:16px 0}.sample-dots i{height:8px;background:#53665a}.sample-dots i.selected{background:var(--lime)}.check-list{display:grid;gap:0}.check-list button{display:flex;text-align:left;gap:14px;align-items:center;border:0;border-bottom:1px solid #526558;padding:14px 0;font-size:15px}.check-list span{font:12px var(--mono);color:var(--lime)}.check-list button.active{background:transparent;color:var(--lime)}.archive-card{border:1px solid #76887a;padding:18px;margin:18px 0}.archive-card .eyebrow{color:#a9baac}.archive-card h4{font-size:24px;margin:10px 0 12px;font-weight:500}.archive-card dl{display:grid;grid-template-columns:95px 1fr;font:12px/1.7 var(--mono);gap:6px;margin:0}.archive-card dd{margin:0}.chapter-fade{animation:fade .35s ease-out}@keyframes fade{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(min-width:1500px){main{padding:40px 60px 0}.story-grid{gap:65px}.demo{min-height:410px}.chapter-meta{margin-bottom:45px}}@media(max-width:1100px){.mast-note{display:none}.page-shell{grid-template-columns:160px 1fr}.chapter-rail{padding-left:24px;padding-right:15px}main{padding:28px 28px 0}.story-grid{gap:26px}h1{font-size:48px}.demo{padding:22px}.dek{font-size:17px}.chapter-meta{font-size:10px}}@media(max-width:800px){.masthead{height:72px;padding:0 22px}.brand-rule{display:none}.page-shell{display:block}.chapter-rail{padding:14px 22px;border:0;border-bottom:1px solid var(--line)}.rail-label,.rail-bottom{display:none}.chapter-rail nav{display:flex;justify-content:space-between;gap:4px}.chapter-link{padding:8px;gap:0}.chapter-link .nav-name{display:none}.chapter-link span{font-size:12px;width:auto}.story-grid{grid-template-columns:1fr 1fr;gap:22px}.chapter-meta{margin-bottom:25px}.chapter-meta span:last-child{display:none}h1{font-size:43px}.demo{min-height:365px;padding:20px}.intro-dots{gap:5px}.intro-dots i{width:5px;height:5px}.key-hint{display:none}.site-footer{padding:15px 22px;font-size:10px}.site-footer span:last-child{max-width:220px;text-align:right}}@media(max-width:620px){main{padding:24px 22px 0}.story-grid{grid-template-columns:1fr;gap:15px;min-height:0}h1{font-size:52px;max-width:450px}.dek{font-size:18px}.story-copy{padding-bottom:5px}.detail-copy{font-size:15px}.chapter-kicker{margin-top:22px}.demo{min-height:350px}.timeline{grid-template-columns:1fr;gap:22px;margin-top:30px}.timeline-item{padding-left:20px}.timeline-item:before{top:8px;left:0}.timeline h3{display:inline;font-size:14px;margin-left:12px}.timeline p{margin-top:4px}.timeline time{font-size:14px}.chapter-footer{padding:23px 0;margin-top:25px}.nav-button{padding:11px 14px;font-size:13px}.page-status{font-size:11px}.brand{font-size:14px;gap:9px}.brand-mark{width:32px;height:32px;font-size:19px}.text-button{font-size:12px}.small-cross{margin-left:5px}.site-footer span:last-child{display:none}dialog{padding:24px}.dialog-head h2{font-size:28px}.readout{font-size:52px}.intro-dots{gap:7px}.intro-dots i{width:7px;height:7px}}@media(max-width:360px){h1{font-size:43px}.masthead{padding:0 14px}.chapter-rail{padding:12px 10px}.brand{font-size:12px}.text-button{font-size:11px}.chapter-link{padding:7px}main{padding:22px 16px 0}.demo{padding:18px}}
:root{--mono:'Cascadia Mono','Consolas','Courier New',monospace;--sans:'Segoe UI',Arial,sans-serif}
.timeline-source{font:11px var(--mono);color:var(--orange);white-space:nowrap;display:inline-block;margin-left:3px}.intro-bars{min-height:144px;margin:26px 0 30px;align-content:center}.census-grid{display:grid;grid-template-columns:repeat(20,1fr);gap:6px;margin:22px 0 26px}.census-grid i{height:9px;background:var(--lime);transition:background .2s}.census-grid i.missing{background:#45564b;outline:1px solid #657568}.coordinates{font-size:42px}.map-plot{height:185px}.price-input{margin-top:22px}.production-chain{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:30px 0}.production-chain div{display:grid;gap:9px;border-top:1px solid #7c8c7e;padding-top:12px}.production-chain span{font:11px var(--mono);color:#bdc9c0}.production-chain b{font:40px var(--mono);color:var(--lime)}.production-chain small{font-size:12px}.sample-result{display:flex;gap:18px;align-items:center;flex-wrap:wrap}.sample-result .readout{font-size:48px}.sample-result>div:last-child{display:grid;gap:6px;font-size:12px;color:#bdc9c0}.sample-result strong{font-weight:500;color:#ecf0e8}.practice-detail{min-height:96px}.demo .evidence-button{margin-top:16px}.demo-label{font-size:12px;letter-spacing:0;flex-wrap:wrap}.chapter-kicker{font-size:12px;line-height:1.6}.demo button{min-height:40px}.source-inline{min-height:30px}.demo-caption,.timeline p{font-size:14px}.detail-copy{font-size:16px}.demo-note{font-size:12px}.station-grid span{font-size:12px}.mini-table{font-size:14px}.story-grid{grid-template-columns:minmax(0,1fr) minmax(0,1.08fr)}.chapter-link span.nav-name{font:inherit;width:auto}.page-status{white-space:nowrap}.chapter-meta{line-height:1.6}.chapter-meta span:last-child{text-align:right}.map-plot{overflow:visible}.evidence-button{width:100%}.source-group li{overflow-wrap:anywhere}
@media(max-width:1100px){h1{font-size:46px}.chapter-kicker{font-size:11px}.demo-label{font-size:11px}.demo{padding:22px}.readout{font-size:50px}.bar-row{grid-template-columns:80px 1fr 40px;gap:8px}}
@media(max-width:800px){.story-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.chapter-link span.nav-name{display:none}.chapter-meta{font-size:12px}.demo{padding:20px}.chapter-link{min-height:36px}.chapter-footer{flex-wrap:wrap}.demo-label{font-size:11px}}
@media(max-width:620px){.story-grid{grid-template-columns:minmax(0,1fr)}h1{font-size:52px}.chapter-kicker{font-size:12px}.demo-label{font-size:12px}.demo{padding:24px}.timeline p{font-size:14px}.practice-detail{min-height:0}.coordinates{font-size:40px}.census-grid{gap:5px}.sample-dots{gap:4px}.chapter-footer .primary{max-width:180px}.production-chain{gap:12px}.demo .station-grid button{min-height:76px}.story-copy{padding-bottom:13px}}
@media(max-width:360px){h1{font-size:43px}.demo{padding:18px}.chapter-rail nav{gap:0}.chapter-link{min-width:27px}.chapter-footer{gap:10px}.page-status{font-size:10px}.nav-button{padding:10px}.demo-label{font-size:11px}}
/* Phone navigation stays reachable while the story scrolls. */
@media(max-width:620px){
  .masthead{height:66px;padding:0 18px;gap:12px}.brand{font-size:13px;letter-spacing:.035em}.brand-mark{width:34px;height:34px}.text-button{min-height:44px;font-size:12px}.small-cross{font-size:20px}
  .chapter-rail{position:sticky;top:0;z-index:4;background:var(--paper);padding:0;border-bottom:1px solid var(--line)}
  .chapter-rail nav{overflow-x:auto;overscroll-behavior-x:contain;justify-content:flex-start;gap:0;padding:3px 12px;scrollbar-width:none;scroll-padding-inline:16px}.chapter-rail nav::-webkit-scrollbar{display:none}
  .chapter-link{flex:0 0 auto;min-height:48px;min-width:48px;padding:10px 12px;gap:8px;white-space:nowrap;font-size:13px}.chapter-link span.nav-name{display:inline}.chapter-link span{font-size:12px}.chapter-link[aria-current="step"] span{border:0;padding:0}.chapter-link[aria-current="step"]{box-shadow:inset 0 -2px var(--orange)}
  main{padding:25px 20px 98px}.chapter-meta{display:block;margin-bottom:25px;font-size:11px}.chapter-meta span:last-child{display:block;text-align:left;margin-top:6px;color:var(--muted);font-size:10px}
  h1{font-size:clamp(40px,12.8vw,54px);line-height:1.04;letter-spacing:-.06em;margin-bottom:24px}.dek{font-size:18px;line-height:1.6}.detail-copy{font-size:16px;line-height:1.7}.chapter-kicker{font-size:11px;margin-top:20px;line-height:1.6}.source-inline{min-height:44px;font-size:14px}.story-copy{padding-bottom:14px}
  .demo{padding:24px 20px;min-height:0}.demo-label{font-size:10px;gap:8px;flex-wrap:nowrap;line-height:1.5}.demo-label span:last-child{white-space:nowrap}.demo h3{font-size:21px;line-height:1.4}.demo button{min-height:48px;font-size:14px;padding:10px 13px}.demo-controls{gap:10px}.demo label{font-size:15px}.demo input[type=range]{height:36px;margin:8px 0 14px}.demo input[type=range]::-webkit-slider-thumb{width:24px;height:24px}.demo-caption{font-size:14px;line-height:1.65}.readout{font-size:54px}.demo-note{font-size:11px;line-height:1.6}.formula{font-size:12px;overflow-wrap:anywhere}.mini-table{font-size:14px}.bar-row{grid-template-columns:82px 1fr 40px;font-size:13px}.intro-stat{gap:16px}.intro-stat span{text-align:right;font-size:11px}.intro-dots{gap:6px}.intro-dots i{width:6px;height:6px}.intro-bars{margin:26px 0 30px}.station-grid{gap:8px}.demo .station-grid button{min-height:76px;padding:8px}.station-grid span{font-size:10px}.station-grid b{font-size:24px}
  .timeline{gap:26px;margin-top:32px;padding-top:23px}.timeline-item{padding-left:17px}.timeline-item:before{top:7px}.timeline h3{display:block;margin:6px 0;font-size:16px}.timeline time{font-size:15px}.timeline p{font-size:15px;line-height:1.6}.timeline-source{font-size:12px;min-height:28px;padding-top:4px}.sample-result{gap:10px}.sample-result .readout{font-size:42px}.sample-result>div:last-child{font-size:12px}.production-chain b{font-size:36px}.archive-card{padding:15px}.archive-card dl{grid-template-columns:80px 1fr;font-size:12px}.practice-detail{min-height:0}.demo .check-list button{padding:15px 0;font-size:16px}.coordinates{font-size:42px}
  .chapter-footer{position:fixed;bottom:0;left:0;right:0;z-index:5;background:var(--paper);padding:12px 16px calc(12px + env(safe-area-inset-bottom));margin:0;gap:10px;flex-wrap:nowrap;box-shadow:0 -8px 20px rgba(32,35,31,.05)}.nav-button{min-height:46px;padding:10px 15px;font-size:14px}.chapter-footer .primary{max-width:170px}.page-status{font-size:11px;justify-content:center;white-space:nowrap}.site-footer{padding:16px 20px 100px;font-size:10px}.site-footer span:last-child{display:none}
  dialog{width:calc(100% - 20px);max-height:90dvh;padding:22px 18px;overscroll-behavior:contain}.dialog-head{gap:12px}.dialog-head h2{font-size:28px;line-height:1.2}.dialog-head .eyebrow{font-size:11px}.close-button{flex-shrink:0;width:44px;height:44px}.source-group h3{font-size:21px}.source-group p,.source-group li{font-size:16px;line-height:1.7}.source-group ul{padding-left:19px}.source-group li{margin:18px 0}.method-note{font-size:16px}
}
@media(max-width:360px){main{padding-left:16px;padding-right:16px}.masthead{padding:0 14px}.brand{font-size:12px;gap:7px}.text-button{font-size:11px}.demo{padding:22px 16px}.demo-label{font-size:9px}.nav-button{padding:10px 12px;font-size:13px}.chapter-footer{padding-left:12px;padding-right:12px}.chapter-footer .primary{max-width:150px}.page-status{font-size:10px}.station-grid span{font-size:9px}.intro-dots{gap:5px}.intro-dots i{width:5px;height:5px}.sample-result>div:last-child{font-size:11px}.sample-result .readout{font-size:38px}}
/* Keep supporting labels readable on compact screens. */
.mast-note,.rail-label,.rail-bottom,.eyebrow,.chapter-meta,.chapter-kicker,.demo-label,.demo-note,.formula,.key-hint,.site-footer,.timeline-source,.station-grid span,.production-chain span,.production-chain small,.sample-result>div:last-child{font-size:12px}
@media(max-width:620px){.chapter-meta,.chapter-meta span:last-child,.chapter-kicker,.demo-label,.demo-note,.site-footer,.page-status,.intro-stat span,.station-grid span,.production-chain span,.production-chain small,.sample-result>div:last-child,.dialog-head .eyebrow{font-size:12px}.demo-label{flex-wrap:wrap}.demo-label span:last-child{display:none}.chapter-meta span:last-child{line-height:1.6}.text-button{font-size:12px}.station-grid span{font-size:12px;letter-spacing:-.02em}}
.demo button:hover{background:#3a4e40;color:white;border-color:#adc2b0}.demo button.active:hover{background:var(--lime);color:var(--dark);border-color:var(--lime)}.station-grid button:not(.active),.station-grid button:not(.active):hover{background:#2d3b32;color:#bcc9be;border-color:#819286}.station-grid button:not(.active) b{text-decoration:line-through}.check-list button:hover,.check-list button.active:hover{background:transparent;color:var(--lime);border-color:#526558}

.page-status{flex-direction:column;gap:3px}#quick-return{font-size:12px;min-height:24px;display:flex;align-items:center}