:root{--ink:#443313;--muted:#75694f;--paper:#fbf8f0;--line:#e6dcc7;--gold:#80600d;--orange:#697787;--serif:'Fira Sans',sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 'Fira Sans',sans-serif}a{color:var(--gold);text-underline-offset:4px}button,input,select{font:inherit}button,select{cursor:pointer}header{display:flex;align-items:center;justify-content:space-between;padding:25px 5%;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:15px;letter-spacing:2px;font-weight:800;text-decoration:none;color:var(--ink)}.brand-icon{display:grid;place-items:center;background:var(--ink);color:#fff;width:36px;height:36px;border-radius:50%;font-size:23px}.brand-sub{border-left:1px solid var(--line);margin-left:12px;padding-left:22px;font-weight:400;letter-spacing:0;color:var(--muted);font-size:13px}.repo{font-size:13px;text-decoration:none}nav{display:flex;gap:25px;overflow-x:auto;padding:0 5%;background:#fff;border-bottom:1px solid var(--line);scrollbar-width:thin}nav a{white-space:nowrap;font-size:13px;text-decoration:none;padding:17px 0;color:var(--muted);border-bottom:3px solid transparent}nav a[aria-current=page]{border-color:var(--gold);color:var(--ink);font-weight:700}main{max-width:1260px;margin:auto;padding:0 40px 80px;min-height:70vh}.eyebrow{text-transform:uppercase;letter-spacing:2.5px;font-size:11px;font-weight:700;color:var(--gold)}.hero{padding:65px 0 40px;display:grid;grid-template-columns:1.35fr 1fr;gap:70px;align-items:end}.hero h1{font:normal clamp(42px,5.2vw,70px)/1.08 var(--serif);letter-spacing:-2px;margin:17px 0 22px}.hero h1 em{color:var(--gold);font-weight:400}.hero p{color:var(--muted);font-size:16px;margin:0;max-width:540px}.hero-note{border-left:2px solid var(--line);padding-left:25px;font-size:14px;color:var(--muted)}.hero-note strong{color:var(--ink);display:block;font-size:13px;margin-bottom:10px}.tags{display:flex;gap:10px;margin-top:25px;flex-wrap:wrap}.tag{border:1px solid var(--line);border-radius:20px;padding:4px 12px;font-size:11px;color:var(--muted)}h2{font:normal 34px/1.25 var(--serif);letter-spacing:-.5px;margin:0 0 18px}h3{font-size:18px;line-height:1.4;margin:0 0 12px}.section{padding:48px 0;border-top:1px solid var(--line)}.section-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:30px}.section-heading p{max-width:480px;color:var(--muted);font-size:14px}.map-card,.chart-card,.source-card{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}.map-top{padding:22px 26px 0;display:flex;justify-content:space-between;align-items:start;gap:20px}.map-top h3{margin:0 0 4px}.small,.map-top p{font-size:12px;color:var(--muted);margin:0}.map-wrap{position:relative;padding:8px 25px}.map-svg{width:100%;height:auto;display:block;background:#fff}.county{stroke:#fff;stroke-width:.35;vector-effect:non-scaling-stroke;cursor:pointer}.county:hover,.county.selected{stroke:#30230c;stroke-width:1.5}.state-border{fill:none;stroke:#fff;stroke-width:1;pointer-events:none;vector-effect:non-scaling-stroke}.map-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 26px 22px}.legend{width:260px;font-size:10px;color:var(--muted)}.gradient{height:8px;border-radius:3px;background:linear-gradient(90deg,#697787,#f5f0e4,#b27c16);margin-bottom:5px}.legend-labels{display:flex;justify-content:space-between}.map-detail{min-height:65px;border-top:1px solid var(--line);padding:12px 26px;background:#fdfaf3;font-size:13px;display:flex;gap:22px;align-items:center;flex-wrap:wrap}.map-detail strong{color:var(--ink)}.map-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.map-controls button,select,input[type=search]{border:1px solid var(--line);border-radius:5px;background:#fff;padding:7px 10px;color:var(--ink);font-size:12px}.map-controls button:hover{background:#f8f0dd}.tooltip{position:absolute;pointer-events:none;background:#443313;color:white;padding:10px 14px;border-radius:6px;font-size:12px;max-width:250px;z-index:5;box-shadow:0 4px 16px #0002}.stats{display:grid;grid-template-columns:repeat(3,1fr);margin:22px 0 12px;border:1px solid var(--line);border-radius:8px;background:#f6eedb}.stat{padding:24px 28px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{font:36px var(--serif);display:block;color:var(--gold)}.stat span{font-size:12px;color:var(--muted)}.caption{font-size:12px;color:var(--muted);margin:14px 0}.prose{max-width:800px;margin:0 auto}.prose p{color:#665a43;margin:0 0 24px}.prose h2{margin-top:35px}.callout{padding:20px 25px;background:#f6eedb;border-left:3px solid var(--gold);font-size:14px;margin:24px 0}.research-root{background:var(--ink);color:#fff;border-radius:10px;text-align:center;padding:32px;max-width:760px;margin:30px auto 35px;position:relative;font:27px/1.4 var(--serif)}.research-root:after{content:'';position:absolute;bottom:-35px;left:50%;height:35px;border-left:1px solid #c3ad77}.questions{display:grid;grid-template-columns:repeat(2,1fr);gap:0 35px;border-top:1px solid #c3ad77}.question{position:relative;padding:22px 20px;margin-top:20px;border:1px solid var(--line);border-radius:8px;background:#fff;display:flex;gap:16px;font-size:14px}.question:before{content:'';position:absolute;left:50%;top:-21px;height:20px;border-left:1px solid #c3ad77}.question b{color:var(--gold);font:24px var(--serif)}.sources{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.source-card{padding:24px}.source-card p{font-size:13px;color:var(--muted)}.source-card a{font-size:12px;display:block;margin-top:8px}.source-number{font:30px var(--serif);color:#b6a477;margin-bottom:20px}.steps{display:grid;grid-template-columns:1fr 1fr;gap:20px}.step{padding:24px;background:#fff;border:1px solid var(--line);border-radius:8px}.step p{font-size:14px;color:var(--muted);margin-bottom:0}.snapshots{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}.snapshots figure{margin:0;border:1px solid var(--line);background:#fff;border-radius:8px;padding:12px}.snapshots img{width:100%;height:auto}.snapshots figcaption{font-size:12px;color:var(--muted)}.chart-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.chart-card{padding:25px 22px}.chart-card.wide{grid-column:1/-1}.chart-card .chart{width:100%;height:370px}.chart-card.wide .chart{height:520px}.chart-card .caption{line-height:1.65}.chart-number{color:var(--gold);font-size:11px;letter-spacing:2px;margin-bottom:10px}.chart-card h3{font:24px var(--serif);min-height:58px}.empty-sections{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:30px}.empty-sections section{border-top:1px solid var(--line);padding:22px 0;min-height:140px}footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;padding:28px 5%;font-size:11px;color:var(--muted)}footer strong{letter-spacing:2px;color:var(--ink)}.skip{position:absolute;top:-100px;z-index:10;background:white;padding:10px}.skip:focus{top:0}:focus-visible{outline:3px solid #ae7813;outline-offset:4px}.loading{padding:70px;text-align:center}.chart-summary{font-size:12px;color:var(--muted)}@media(max-width:900px){.brand-sub{display:none}.hero{gap:30px}.sources{grid-template-columns:1fr 1fr}.map-top{flex-direction:column}.chart-grid{grid-template-columns:1fr}.chart-card.wide{grid-column:auto}}@media(max-width:600px){header{padding:18px 20px}.brand{font-size:12px}.repo{font-size:11px}nav{gap:22px;padding:0 20px}main{padding:0 20px 50px}.hero{padding:38px 0 30px;grid-template-columns:1fr;gap:25px}.hero h1{font-size:47px}.hero-note{font-size:13px}.section{padding:32px 0}h2{font-size:29px}.section-heading{display:block}.map-wrap{padding:8px}.map-top{padding:18px}.map-bottom{padding:12px 18px;align-items:start;flex-direction:column}.map-detail{padding:12px 18px;gap:8px}.stats{grid-template-columns:1fr}.stat{padding:15px 22px;border-right:0;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:20px}.stat strong{font-size:28px;min-width:100px}.sources,.steps,.snapshots,.questions{grid-template-columns:1fr}.research-root{font-size:23px;padding:25px}.questions{gap:0}.chart-card{padding:20px 10px}.chart-card h3,.chart-card .caption,.chart-number{padding:0 10px}.chart-card .chart{height:330px}.chart-card.wide .chart{height:430px}.empty-sections{grid-template-columns:1fr}footer{flex-direction:column;padding:24px 20px}.map-controls input{max-width:180px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
:is(.chart-card,.chart-scroll){min-width:0}.chart-scroll{overflow-x:auto}#chart-9{min-width:680px}

/* Shared section hierarchy and in-chapter navigation. */
.section-nav{position:sticky;top:0;z-index:8;padding:10px 16px;gap:20px;border:1px solid var(--line);border-radius:6px;background:#fbf8f0f5;align-items:center}
.section-nav>span{font-size:11px;letter-spacing:1px;text-transform:uppercase;white-space:nowrap;font-weight:600}
.section-nav a{padding:6px 0;font-size:13px}
.section-nav a[aria-current=location]{color:var(--gold);border-color:var(--gold);font-weight:600}
.section-title{background:var(--ink);color:#fbf8f0;padding:20px 24px;border-radius:6px;font-weight:400;font-size:30px;line-height:1.3;letter-spacing:0;scroll-margin-top:90px}
.prose .section-title{margin-top:0}
.section-banner{background:var(--ink);color:#fbf8f0;padding:20px 24px;border-radius:6px;margin-bottom:24px;align-items:center}
.section-banner .section-title{margin:0;padding:0;border-radius:0;background:none;flex:1}
.section-banner p,.section-banner a{color:#f4e5bd;margin:0}
.section>.eyebrow{margin-bottom:12px}
.section{border-top:2px solid var(--line);margin-top:28px}
.hero{scroll-margin-top:80px}.hero-note:empty{display:none}
.tooltip>strong,.tooltip>span{display:block}
.tooltip{max-width:min(340px,calc(100% - 16px));line-height:1.6}
.cleaning-sequence{display:grid;gap:32px;margin-top:28px}
.cleaning-stage{border:1px solid var(--line);border-radius:8px;background:white;padding:24px;min-width:0}
.cleaning-stage h3{background:var(--ink);color:#fbf8f0;font-weight:400;font-size:24px;padding:16px 20px;border-radius:5px;margin:-4px -4px 18px}
.cleaning-stage h3 span{color:#eed49a;margin-right:12px;font-size:17px}
.cleaning-stage>p:not(.caption):not(.eyebrow){max-width:950px}
.cleaning-comparison{margin:22px 0;background:var(--paper);padding:12px;border:1px solid var(--line);border-radius:6px}
.cleaning-comparison img{display:block;width:100%;height:auto}
.cleaning-comparison figcaption{font-size:13px;color:var(--muted);padding:8px}
.notebook-evidence{border:1px solid var(--line);border-radius:6px;margin:16px 0;overflow:hidden}
.notebook-evidence summary{padding:14px 18px;background:#f6eedb;cursor:pointer;font-weight:500}
.notebook-output{padding:0 16px 16px;min-width:0}
.table-scroll{overflow:auto;max-height:440px;border:1px solid var(--line);border-radius:4px}
.table-scroll table{border-collapse:collapse;font-size:12px;line-height:1.5;width:100%;text-align:left}
.table-scroll th,.table-scroll td{padding:9px 12px;border-bottom:1px solid var(--line);white-space:nowrap}
.table-scroll thead th{background:var(--ink);color:#fbf8f0;font-weight:500}
.table-scroll tbody tr:nth-child(even){background:#fcf8ee}
.table-scroll pre{padding:12px;margin:0;white-space:pre-wrap;font:13px/1.6 'Fira Sans',sans-serif}
@media(max-width:600px){.section-title{font-size:24px;padding:16px}.section-banner{padding:16px}.section-banner p{margin-top:12px}.section-nav{gap:18px;padding:8px 12px}.section-nav>span{display:none}.cleaning-stage{padding:14px}.cleaning-stage h3{font-size:21px;margin:0 0 16px;padding:14px}.notebook-output{padding:0 8px 8px}.cleaning-comparison{padding:4px}.hero h1{letter-spacing:-1px}}
.brand{letter-spacing:0;max-width:850px;gap:16px}.brand-title{font-size:22px;line-height:1.3;font-weight:600}.brand-icon{width:48px;height:48px;flex:0 0 48px}.repo{white-space:nowrap;margin-left:25px}
footer strong{letter-spacing:0;font-size:13px;font-weight:500}
.eyebrow{display:inline-block;font-size:14px;font-weight:600;letter-spacing:1.3px;background:#f3e8c9;color:var(--ink);border:1px solid #e1cfa4;border-radius:6px;padding:8px 13px;scroll-margin-top:90px}
.hero p:empty{display:none}.hero h1{font-size:clamp(36px,4.4vw,62px);letter-spacing:-1.5px}
.sources+.prose{margin-top:36px}
.map-top h3.visualization-title,.chart-card h3.visualization-title{font-family:'Fira Sans',sans-serif;font-size:27px;line-height:1.3;font-weight:600;letter-spacing:-.4px;min-height:0;margin:0 0 20px}
.time-note{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin:16px 0 0}
.map-card>.time-note{padding:12px 26px;margin:0;background:#fff}
.section-source{margin:30px 0 0;padding-top:20px;border-top:1px solid var(--line);font-size:14px}
.cleaning-comparison{max-width:440px;padding:8px;margin:20px 0}.cleaning-comparison a{display:block}.cleaning-comparison img{max-height:230px;object-fit:contain}.cleaning-comparison figcaption{font-size:12px;line-height:1.6}
.notebook-output{padding-top:14px}.cleaning-stage{scroll-margin-top:90px}
@media(max-width:600px){header{align-items:flex-start;gap:12px;flex-wrap:wrap}.brand{gap:12px}.brand-title{font-size:18px}.brand-icon{width:40px;height:40px;flex-basis:40px}.repo{margin-left:52px}.eyebrow{font-size:12px;padding:7px 10px}.hero h1{font-size:39px}.map-top h3.visualization-title,.chart-card h3.visualization-title{font-size:23px}.chart-card .time-note{margin-left:10px;margin-right:10px}}

.hero.hero-full{grid-template-columns:minmax(0,1fr);gap:0}
.source-subheading{display:inline-block;background:var(--ink);color:#fbf8f0;border-radius:5px;padding:10px 16px;font-size:20px;font-weight:500;line-height:1.4;margin:0 0 18px}
.chart-grid{grid-template-columns:minmax(0,1fr)}
.chart-card .chart{height:520px}
@media(max-width:600px){.chart-card .chart{height:430px}}

.questions + .prose{margin-top:36px}