:root{--paper:#f7f5ef;--white:#fffefb;--ink:#252e2c;--muted:#586460;--line:#d5dbd4;--green:#1f6454;--soft:#e9efe7;--amber:#986039;--sand:#eee6d9;--serif:Georgia,'Times New Roman',serif;--sans:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:auto;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 var(--sans)}button,a,input{touch-action:manipulation}a{color:var(--green);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--green);outline-offset:5px}button[hidden],[hidden]{display:none!important}.skip{position:absolute;left:16px;top:-100px;background:var(--white);padding:12px;z-index:20}.skip:focus{top:10px}.wrap{max-width:1180px;margin:auto;padding:0 48px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:26px 0;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:650;letter-spacing:-.03em;font-size:22px}.brand-mark{display:grid;place-items:center;width:34px;height:38px;border:1px solid var(--green);font:18px var(--serif);color:var(--green);border-radius:2px 10px 2px 2px}.top-links{display:flex;gap:25px;font-size:13px}.top-links a{color:var(--muted);text-decoration:none}.hero{padding:76px 0 62px;display:grid;grid-template-columns:1fr 255px;gap:50px;align-items:end}.eyebrow{font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--green);font-weight:650;margin:0 0 23px}.hero h1{font:normal clamp(56px,7.5vw,94px)/.99 var(--serif);letter-spacing:-.055em;margin:0 0 28px;max-width:720px}.hero .dek{font:20px/1.55 var(--sans);color:var(--muted);max-width:630px;margin:0 0 28px}.metadata{font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap}.metadata span+span:before{content:'·';margin-right:10px}.hero-note{padding:24px 0 0 24px;border-left:1px solid var(--line);font-size:14px;line-height:1.6}.hero-note strong{display:block;font:25px/1.2 var(--serif);letter-spacing:-.02em;margin-bottom:12px}.hero-note p{margin:0;color:var(--muted)}.hero-note a{display:inline-block;margin-top:18px;font-size:13px;text-decoration:none}.reading-line{height:3px;background:var(--line);position:sticky;top:0;z-index:5}.reading-line span{display:block;width:0;height:100%;background:var(--green)}.content-layout{display:grid;grid-template-columns:218px minmax(0,1fr);gap:68px;padding-top:50px}.sidebar{align-self:start;position:sticky;top:35px;font-size:13px;padding:0 0 30px}.sidebar-label{font-size:10px;text-transform:uppercase;letter-spacing:.15em;color:var(--muted);margin:0 0 17px}.contents{list-style:none;margin:0;padding:0}.contents li{margin:0 0 6px}.contents a{display:grid;grid-template-columns:25px 1fr;gap:8px;text-decoration:none;color:var(--muted);padding:10px 0;border-left:2px solid transparent;padding-left:12px;margin-left:-14px;line-height:1.45}.contents a[aria-current="location"]{color:var(--green);border-color:var(--green);font-weight:600}.contents .number{font-size:11px;opacity:.8;line-height:1.7}.sidebar .extra-links{margin-top:24px;padding-top:20px;border-top:1px solid var(--line);display:grid;gap:11px}.sidebar .extra-links a{text-decoration:none;color:var(--muted)}.sidebar-note{margin-top:30px;font-size:12px;color:var(--muted);line-height:1.6}.article{min-width:0;max-width:760px}.intro{font:21px/1.65 var(--serif);margin:0 0 40px}.chapter{padding:12px 0 48px;scroll-margin-top:28px}.chapter+.chapter{padding-top:42px;border-top:1px solid var(--line)}.chapter-label{display:flex;align-items:center;gap:12px;font-size:10px;text-transform:uppercase;letter-spacing:.14em;color:var(--green);margin:0 0 14px}.chapter-label span{display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;width:26px;height:26px;font-size:11px;letter-spacing:0}.chapter h2{font:normal clamp(29px,3.1vw,37px)/1.19 var(--serif);letter-spacing:-.028em;margin:0 0 23px}.chapter p{margin:0 0 19px}.citation{font-size:12px;display:inline;white-space:normal}.citation a{text-decoration:none;border-bottom:1px solid var(--line)}.subhead{font:normal 24px/1.3 var(--serif);letter-spacing:-.015em;margin:32px 0 14px}.interact{margin:30px 0 8px;background:var(--white);border:1px solid var(--line);padding:26px;border-radius:3px}.interactive-label{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--green);margin:0 0 8px;display:flex;align-items:center;gap:7px}.interactive-label:before{content:'';width:6px;height:6px;border-radius:50%;background:var(--green)}.interact h3{font:normal 26px/1.25 var(--serif);letter-spacing:-.02em;margin:0 0 12px}.interact p{font-size:13px;line-height:1.6;margin:0 0 16px}.control-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:22px}.switches{display:flex;flex-wrap:wrap;gap:5px}.switches button,.lens-buttons button{padding:9px 13px;border:1px solid var(--line);background:transparent;border-radius:3px;font-size:12px;min-height:42px}.switches button[aria-pressed="true"],.lens-buttons button[aria-pressed="true"]{background:var(--green);border-color:var(--green);color:var(--white)}.scale-status{font-size:11px;color:var(--muted)}.chart{width:100%;height:auto;display:block;overflow:visible;margin:18px 0 10px}.chart text{font-family:var(--sans);font-size:12px;fill:var(--ink)}.chart .axistext{font-size:11px;fill:var(--muted)}.chart .grid{stroke:var(--line);stroke-width:1}.chart .zero{stroke:var(--muted);stroke-width:1;stroke-dasharray:3 4}.chart .interval{stroke:var(--green);stroke-width:3;stroke-linecap:round}.chart .dot{fill:var(--green)}.chart .point-label{font-weight:600;fill:var(--green)}.chart-caption{font-size:12px!important;color:var(--muted);margin-bottom:12px!important}.quiet-details{font-size:12px;border-top:1px solid var(--line);padding-top:13px;margin-top:14px}.quiet-details summary{cursor:pointer;padding:4px 0;color:var(--green);font-weight:550}.quiet-details p{margin:12px 0 8px;font-size:12px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:12px;text-align:left;line-height:1.5}th,td{padding:9px 8px;border-bottom:1px solid var(--line);vertical-align:top}th{font-weight:600}td:first-child,th:first-child{padding-left:0}caption{text-align:left;margin:8px 0;font-weight:600}.context-note{border-left:3px solid var(--green);padding:18px 23px;background:var(--soft);margin:28px 0 0}.context-note .note-label{font-size:10px;text-transform:uppercase;letter-spacing:.12em;color:var(--green);margin:0 0 10px}.context-note p:last-child{margin-bottom:0}.context-note p{font-size:14px;line-height:1.7}.evidence-area{border-top:1px solid var(--line);padding-top:42px;scroll-margin-top:28px}.evidence-area h2{font:normal 36px/1.2 var(--serif);letter-spacing:-.03em;margin:0 0 14px}.evidence-intro{color:var(--muted);font-size:15px;margin:0 0 22px}.lens-buttons{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:24px}.lens-card{border-top:1px solid var(--line);padding:25px 0 15px}.lens-kind{font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--green);margin:0 0 9px}.lens-card h3{font:normal 26px/1.2 var(--serif);margin:0 0 22px}.lens-flow{display:grid;grid-template-columns:1fr 1fr;gap:22px}.lens-box{padding-top:16px;border-top:2px solid var(--line)}.lens-box:first-child{border-color:var(--green)}.lens-box strong{display:block;font-size:12px;font-weight:600;margin-bottom:9px}.lens-box p{font-size:14px;line-height:1.65;margin:0 0 16px}.lens-card .example{font-size:15px;margin:0 0 22px;max-width:630px}.sources-area{padding:45px 0 50px;margin-top:34px;border-top:1px solid var(--line);scroll-margin-top:28px}.sources-area h2{font:normal 32px/1.2 var(--serif);margin:0 0 20px}.sources-area .source-intro{font-size:13px;line-height:1.7;color:var(--muted);margin:0 0 22px}.source{border-top:1px solid var(--line);padding:0}.source summary{cursor:pointer;list-style:none;padding:15px 0;display:flex;gap:16px;align-items:baseline;font-size:13px}.source summary::-webkit-details-marker{display:none}.source summary:after{content:'+';margin-left:auto;font-size:18px;font-weight:400}.source[open] summary:after{content:'−'}.source .source-num{font-size:11px;color:var(--green);min-width:22px}.source .source-body{font-size:13px;padding:0 0 18px 38px;line-height:1.65}.source-body p{margin:0 0 9px}.source-body a{font-size:12px}.footer{border-top:1px solid var(--line);padding:33px 0 45px;display:flex;gap:24px;justify-content:space-between;align-items:start;font-size:12px;color:var(--muted)}.footer strong{font:23px var(--serif);color:var(--ink);display:block;margin-bottom:8px}.footer p{margin:0;max-width:400px}.footer a{font-size:12px}.js-only{display:none}body.js .js-only{display:flex}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}body:not(.js) .chart{display:none}.chapter .last-note{color:var(--muted);font-size:14px}
.brain-explorer{margin:32px 0;background:var(--white);border:1px solid var(--line);border-radius:3px;padding:26px}.brain-explorer h3{font:normal 27px/1.25 var(--serif);margin:0 0 14px}.brain-explorer p{font-size:14px;line-height:1.7}.brain-explorer .explorer-hint{font-size:12px;color:var(--muted);margin-bottom:12px}.brain-map{position:relative;gap:12px;align-items:stretch;margin:0 0 22px}.brain-map:before{content:'';position:absolute;top:23px;left:15%;right:15%;border-top:2px solid var(--line)}.brain-map button{position:relative;flex:1;min-width:0;min-height:85px;border:1px solid var(--line);border-radius:3px;background:var(--white);padding:14px 8px 12px;font-size:12px;line-height:1.45}.process-dot{display:block;width:16px;height:16px;margin:0 auto 10px;border:2px solid var(--green);border-radius:50%;background:var(--white)}.brain-map button[aria-pressed="true"]{background:var(--soft);border-color:var(--green);font-weight:650}.brain-map button[aria-pressed="true"] .process-dot{background:var(--green);box-shadow:0 0 0 4px var(--soft)}.process-panel{border-top:2px solid var(--green);padding:20px 0 4px}.process-panel h4{font:normal 23px/1.3 var(--serif);margin:0 0 12px}.brain-explorer figcaption{color:var(--muted);font-size:12px;line-height:1.65;border-top:1px solid var(--line);padding-top:14px}.science-notes{margin-bottom:30px}.science-notes .quiet-details{padding:0;margin:0;font-size:15px}.science-notes summary{padding:16px 0;line-height:1.5}.science-notes p{font-size:14px;line-height:1.7;padding-bottom:12px}
@media(max-width:900px){.wrap{padding:0 30px}.content-layout{grid-template-columns:174px minmax(0,1fr);gap:32px}.hero{grid-template-columns:1fr 210px;gap:24px}.hero-note{font-size:13px}.interact{padding:21px}.top-links{gap:15px}}
@media(max-width:700px){body{font-size:16px}.wrap{padding:0 22px}.topbar{padding:20px 0}.brand{font-size:19px}.top-links a:first-child{display:none}.top-links{gap:18px;font-size:12px}.hero{grid-template-columns:1fr;padding:43px 0 37px;gap:20px}.hero h1{font-size:64px;max-width:500px}.hero .dek{font-size:18px}.hero-note{padding:0;border:0;display:none}.content-layout{display:block;padding-top:25px}.sidebar{position:static;padding-bottom:23px;border-bottom:1px solid var(--line);margin-bottom:32px}.contents{display:grid;grid-template-columns:1fr 1fr;gap:3px 18px}.contents a{padding:8px 0;margin:0;border:none;grid-template-columns:22px 1fr;gap:4px;font-size:12px}.contents a[aria-current="location"]{font-weight:500;color:var(--muted)}.sidebar .extra-links,.sidebar-note{display:none}.intro{font-size:20px}.chapter{padding-bottom:32px}.chapter+.chapter{padding-top:32px}.chapter h2{font-size:31px}.interact{margin-top:25px;padding:20px 16px}.interact h3{font-size:25px}.lens-flow{grid-template-columns:1fr;gap:10px}.lens-buttons button{flex:1 0 40%;padding:10px 8px;min-height:44px}.lens-buttons button:last-child{flex:0 1 auto}.footer{flex-direction:column}.source summary{font-size:12px;gap:10px}.source .source-body{padding-left:30px}.control-row{gap:9px}.evidence-area h2{font-size:32px}}
@media(max-width:360px){.wrap{padding:0 16px}.hero h1{font-size:55px}.top-links{gap:12px}.brand-mark{display:none}.contents{gap:4px 10px}.chart text{font-size:11px}}
@media(max-width:500px){.brain-explorer{padding:20px 16px}.brain-map{flex-direction:column;gap:8px}.brain-map:before{top:12px;bottom:12px;left:22px;right:auto;border-top:0;border-left:2px solid var(--line)}.brain-map button{display:flex;align-items:center;gap:12px;min-height:48px;text-align:left;padding:12px 14px;font-size:13px}.process-dot{flex:none;margin:0}.brain-explorer h3{font-size:25px}}
@media print{.brain-explorer{padding:16px;break-inside:auto}.brain-explorer .process-panel[hidden]{display:block!important}.process-panel{break-inside:avoid}.science-notes .quiet-details{break-inside:avoid}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}
@media print{body{background:#fff;color:#222;font-size:11pt}.wrap{max-width:none;padding:0}.hero{padding:20px 0;grid-template-columns:1fr}.hero h1{font-size:44pt}.hero-note,.top-links,.sidebar,.reading-line,.control-row,.lens-buttons,.skip{display:none!important}.content-layout{display:block;padding:0}.article{max-width:none}.chapter{padding:12px 0}.chapter h2{font-size:23pt}.interact,.context-note{break-inside:avoid}.chart{display:none}.print-table{display:none}.evidence-area [hidden]{display:block!important}.lens-card{break-inside:avoid}.source .source-body{display:block!important}.source summary:after{content:''}.footer{padding:15px 0}.sources-area{margin-top:0}.chapter-label{margin-top:15px}.metadata{font-size:9pt}a{color:#222}.js-only{display:none!important}}
