@charset "UTF-8";
:root{--paper:#f5f2eb;--ink:#292b27;--muted:#69695e;--copper:#9b5839;--line:#d8d2c5;--green:#376b5d;--gold:#b99447;--serif:Georgia,'Times New Roman',serif;--sans:'Segoe UI',Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--sans);font-size:18px;line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:5px}button,input,select{font:inherit}button,select{cursor:pointer}button{color:inherit}button:disabled{cursor:default;opacity:.55}a,button,input,select,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--green);outline-offset:6px}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-family:var(--serif);font-weight:400;line-height:1.13}h2{font-size:38px}h3{font-size:27px}p+p{margin-top:18px}button{border:0}svg{max-width:100%}.site-header,main,footer{max-width:1220px;margin:auto;padding-left:40px;padding-right:40px}.site-header{height:112px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;font-size:15px;line-height:1.4;letter-spacing:2px;font-weight:600}.brand svg{width:43px;height:43px;fill:none;stroke:var(--copper);stroke-width:1.2}.site-header nav{display:flex;gap:38px;font-size:17px}.site-header nav a{text-decoration:none}.site-header nav a:hover{color:var(--copper)}.skip{position:fixed;top:-100px;left:20px;padding:12px 20px;background:var(--ink);color:white;z-index:99}.skip:focus{top:10px}.hero{display:flex;align-items:center;justify-content:space-between;padding:66px 0 60px;gap:30px}.eyebrow{font-size:15px;letter-spacing:2.2px;font-weight:600;color:var(--copper);line-height:1.5}.hero h1{font-size:clamp(48px,5.2vw,72px);letter-spacing:-2.5px;margin:18px 0 24px}.hero h1 em{font-weight:400;color:var(--copper)}.hero-description{font-size:20px;line-height:1.6;color:var(--muted)}.hero-art{width:350px;flex-shrink:0;margin-right:16px}.view-bar{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:20px 0;display:flex;align-items:center;justify-content:space-between;gap:20px}.view-switch{display:flex;padding:5px;background:#eae6dd;border:1px solid #e2ddd2;border-radius:9px;gap:4px}.view-switch button{padding:10px 19px;border-radius:5px;font-size:17px;background:transparent;white-space:nowrap}.view-switch button[aria-pressed=true]{background:var(--ink);color:var(--paper);box-shadow:0 2px 5px #292b2715}.view-switch button span{margin-right:8px}.view-hint{font-size:16px;color:var(--muted)}.era-heading{display:flex;justify-content:space-between;align-items:end;margin:47px 0 18px;gap:20px}.era-heading h2{margin-top:8px;font-size:37px}.era-meta{text-align:right;display:grid;font-size:16px;color:var(--muted);gap:5px}.era-meta>span:first-child{color:var(--ink);font-size:18px}.timeline-key{font-size:16px;display:flex;gap:12px;color:var(--copper)}.timeline-key span:last-child{color:var(--muted);margin-left:12px}.timeline{position:relative;height:850px;margin-top:32px}.timeline-path{position:absolute;inset:0;width:100%;height:850px;overflow:visible;fill:none;stroke:var(--copper);stroke-width:2}.timeline-path .future-line{stroke:#b8a88e;stroke-dasharray:4 7}.timeline-path .arrow{stroke:#b8a88e}.timeline-people{padding:0;margin:0;list-style:none}.timeline-item{position:absolute;width:250px;transform:translateX(-50%)}.item-1{left:15%;top:0}.item-2{left:46%;top:0}.item-3{left:78%;top:0}.item-4{left:65%;top:315px}.item-5{left:28%;top:315px}.person-card{position:relative;display:flex;flex-direction:column;align-items:center;text-decoration:none;text-align:center;height:240px;isolation:isolate}.portrait{display:block;width:118px;height:118px;border-radius:50%;padding:5px;border:1px solid #b9ab93;background:var(--paper);transition:transform .2s,border-color .2s}.portrait img{display:block;width:100%;height:100%;object-fit:cover;border-radius:50%;mix-blend-mode:multiply}.person-name,.concept-name{font:30px/1.2 var(--serif);margin:12px 0 6px}.card-detail{font-size:16px;color:var(--muted)}.card-date{font-size:16px;margin-top:5px;color:var(--copper)}.node{position:absolute;top:234px;width:13px;height:13px;border:2px solid var(--copper);border-radius:50%;background:var(--paper)}.node:before{content:'';position:absolute;width:1px;height:6px;background:var(--copper);bottom:11px;left:4px}.person-card:hover .portrait,.person-card:focus-visible .portrait{transform:translateY(-5px);border-color:var(--copper)}.person-card:hover .node,.person-card:focus-visible .node{background:var(--copper)}.hover-info{position:absolute;z-index:10;left:50%;transform:translateX(-50%) translateY(6px);top:100%;margin-top:23px;width:302px;padding:20px 23px;background:var(--ink);color:var(--paper);border-radius:7px;text-align:left;font-size:17px;line-height:1.5;box-shadow:0 12px 32px #292b2724;visibility:hidden;opacity:0;transition:opacity .15s,transform .15s}.hover-info:before{content:'';position:absolute;top:-8px;left:calc(50% - 8px);width:16px;height:16px;background:var(--ink);transform:rotate(45deg)}.hover-info strong{display:block;font-size:15px;font-weight:400;color:#d9b28c;margin-bottom:7px}.hover-info>span{display:block;margin-top:12px;color:#d9b28c}.timeline-item:hover,.timeline-item:focus-within{z-index:12}.person-card:hover .hover-info,.person-card:focus-visible .hover-info{visibility:visible;opacity:1;transform:translateX(-50%) translateY(0)}.person-card.dismiss-tooltip .hover-info{visibility:hidden;opacity:0}.concept-icon,.concept-name,.concept-detail{display:none}.timeline[data-view=concepts] .portrait,.timeline[data-view=concepts] .person-name,.timeline[data-view=concepts] .people-detail{display:none}.timeline[data-view=concepts] .concept-icon{display:grid;place-items:center;width:118px;height:118px;border:1px solid #c4ad89;border-radius:50%;font:58px var(--serif);color:var(--copper);background:#ede5d5}.timeline[data-view=concepts] .concept-name{display:block;font-size:28px;max-width:250px}.timeline[data-view=concepts] .concept-detail{display:block}.timeline-continuation{position:absolute;top:667px;left:28%;max-width:70%}.timeline-continuation p{font-family:var(--serif);font-size:27px;margin-top:5px}.timeline-continuation>span:last-child{color:var(--muted);font-size:17px}.today{position:absolute;top:798px;right:4%;font-size:16px;color:var(--muted)}.about{padding:46px 0 58px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1.3fr;gap:80px}.about h2{margin-top:14px;font-size:34px}.about p:not(.eyebrow){font-size:18px;color:var(--muted);max-width:620px}.about:target{scroll-margin-top:40px}footer{border-top:1px solid var(--line);padding-top:27px;padding-bottom:35px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:16px;color:var(--muted)}.footer-brand{font-family:var(--serif);color:var(--ink);font-size:21px;text-decoration:none}footer>span{font-size:16px}footer>a:last-child{text-decoration:none}
/* Biography pages */
.detail-main{max-width:1120px}.back-link{display:inline-block;margin-top:32px;color:var(--muted);font-size:17px;text-decoration:none}.person-hero{display:grid;grid-template-columns:1fr 240px;gap:54px;padding:40px 0 45px;align-items:center}.person-hero h1{font-size:clamp(43px,5vw,65px);letter-spacing:-1.8px;margin:15px 0 20px}.person-meta{font-size:18px;color:var(--muted)}.person-meta span{margin:0 12px}.detail-lead{font-size:23px;max-width:690px;margin-top:23px;line-height:1.55}.person-hero figure{text-align:center}.person-hero img{border-radius:50%;width:230px;height:230px;mix-blend-mode:multiply;border:1px solid #c8b99d;padding:8px}.person-hero figcaption{font-size:15px;color:var(--muted);margin-top:8px}.text-link{display:inline-block;margin-top:23px;color:var(--copper);font-size:18px}.life-section{padding:32px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1.6fr;gap:40px}.life-section h2{font-size:29px;max-width:240px;line-height:1.3}.life-section ul{margin:0;padding-left:22px;display:grid;gap:12px}.lesson{padding-top:64px;scroll-margin-top:35px}.lesson-intro{max-width:780px}.lesson h2{margin:13px 0 24px;font-size:42px}.lesson-intro>p:not(.eyebrow){font-size:20px}.demo{margin-top:30px;background:#fcfaf5;border:1px solid var(--line);border-radius:12px;padding:30px;overflow:hidden}.demo-controls{padding-bottom:24px;border-bottom:1px solid #e6e0d5;max-width:100%}.demo-controls:has(select){display:flex;gap:18px;align-items:center;flex-wrap:wrap}.slider-label{display:flex;justify-content:space-between;gap:15px;font-weight:500;margin-bottom:13px}.slider-label output{font-variant-numeric:tabular-nums;color:var(--copper);font-weight:600}.demo input[type=range]{display:block;width:100%;max-width:100%;height:24px;accent-color:var(--copper);cursor:pointer;margin:0}.two-controls{display:grid;grid-template-columns:1fr 1fr;gap:48px}.control-help{display:block;color:var(--muted);font-size:16px;margin-top:10px}.demo select{border:1px solid #c9beab;padding:9px 32px 9px 12px;background:#fcfaf5;color:var(--ink);border-radius:5px;max-width:100%}.action{background:var(--ink);color:#fcfaf5;padding:11px 20px;border-radius:6px;line-height:1.5;min-height:48px}.action:hover{background:var(--copper)}.quiet-button{background:transparent;color:var(--muted);padding:5px}.equation{font-family:var(--serif);font-size:34px;line-height:1.4;text-align:center;font-variant-numeric:tabular-nums}.demo>.equation{margin-top:18px}.demo-caption{text-align:center;color:var(--muted);font-size:18px;max-width:770px;margin:15px auto 0;line-height:1.6}.interactive-svg{display:block;width:100%;height:auto;margin:15px auto;max-height:520px;font-family:var(--sans)}.interactive-svg text{font-size:21px;fill:var(--ink)}.takeaway{margin-top:22px;padding:20px 24px;border-left:3px solid var(--green);background:#e9eee7;font-size:20px}.takeaway span{display:block;font-size:14px;letter-spacing:2px;color:var(--green);font-weight:600;margin-bottom:6px}.fraction-visual{padding:34px 0 15px;max-width:780px;margin:auto;display:grid;gap:28px}.fraction-row>span{display:block;font-size:17px;margin-bottom:9px;color:var(--muted)}.fraction-bar{display:flex;height:88px;position:relative;background:#ede9e0;border:1px solid #cbbfa9;border-radius:5px;overflow:hidden}.fraction-bar>.piece{display:grid;place-items:center;background:#b9cfc1;color:#234d40;border-right:1px solid #fcfaf5;font-size:23px;flex-shrink:0}.fraction-bar>.piece:nth-child(even){background:#ddad88;color:#673a24}.fraction-bar>.cut{position:absolute;top:0;bottom:0;width:1px;background:#fcfaf5;pointer-events:none}.fraction-row.ghost{opacity:.5}.square-layout{display:grid;grid-template-columns:1fr 1fr;gap:45px;align-items:center;padding:38px 8px 18px}.square-grid{display:grid;aspect-ratio:1;gap:2px;max-width:350px;width:100%;margin:auto}.square-grid i{display:block;background:#c9855f;border:1px solid #a7633e;border-radius:2px}.square-layout .equation{text-align:left;font-size:40px}.square-layout p:not(.equation){margin-top:20px;font-size:20px}.notation{color:var(--muted);font-family:var(--serif);font-size:30px!important}.step-heading{display:flex;justify-content:space-between;gap:20px;font-size:18px;color:var(--copper)}.construction-footer{display:flex;align-items:center;justify-content:space-between;gap:30px}.construction-footer p{font-size:20px;max-width:590px}.construction-footer button{flex-shrink:0}.pi-layout{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center}.pi-readings{padding:20px 0}.pi-readings>div{display:grid;gap:5px}.pi-readings span,.pi-readings small{font-size:17px;color:var(--muted)}.pi-readings output{font:40px var(--serif);color:var(--green);font-variant-numeric:tabular-nums}.pi-readings>div:last-child output{color:var(--copper)}.pi-middle{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:20px 0;padding:16px 0;font:28px var(--serif)}.swatch{display:inline-block;height:3px;width:18px;vertical-align:middle;margin-right:5px;background:var(--green)}.swatch.outer{background:var(--copper)}.proof{border-top:1px solid var(--line);margin-top:25px;padding-top:20px}.proof summary{cursor:pointer;font-size:20px;color:var(--copper)}.proof p{max-width:720px;margin:18px auto}.proof-svg{display:block;width:280px;margin:25px auto}.proof-equation{font-size:23px;font-family:var(--serif)}.other-ideas{margin:65px 0 40px}.other-ideas>div{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:25px}.other-ideas article{border-top:1px solid var(--line);padding-top:22px}.other-ideas h3{margin-bottom:13px}.other-ideas p{color:var(--muted)}.historical-note{padding:30px;background:#eae6dd;border-radius:8px}.historical-note h2{font-size:28px;margin-bottom:16px}.historical-note h3{font:600 18px var(--sans);margin:24px 0 12px}.historical-note p{font-size:18px}.historical-note ul{padding-left:22px;margin:0 0 24px}.historical-note li+li{margin-top:7px}.historical-note a{font-size:17px}.historical-note p:last-child{font-size:16px;color:var(--muted)}.next-person{display:flex;justify-content:space-between;align-items:center;padding:35px 0 55px;gap:20px}.next-person a{text-decoration:none;font-size:17px}.next-person a:last-child{text-align:right;color:var(--muted)}.next-person strong{display:block;font:30px var(--serif);color:var(--copper);margin-top:7px}
@media(min-width:1400px){.hero{padding-top:75px;padding-bottom:70px}}
@media(max-width:1050px){.site-header,main,footer{padding-left:30px;padding-right:30px}.hero-art{width:270px;margin:0}.hero h1{font-size:58px}.view-hint{max-width:190px}.timeline-item{width:220px}.hover-info{width:270px}.card-detail{font-size:15px}.person-name{font-size:28px}.about{gap:40px}.timeline[data-view=concepts] .concept-name{font-size:24px}.person-hero{gap:30px;grid-template-columns:1fr 200px}.person-hero img{width:190px;height:190px}.construction-footer{flex-direction:column;align-items:start}.construction-footer button{align-self:end}.person-meta span{margin:0 7px}}
@media(max-width:760px){.site-header,main,footer{padding-left:22px;padding-right:22px}.site-header{height:94px}.brand{font-size:12px;letter-spacing:1.3px;gap:9px}.brand svg{width:36px;height:36px}.site-header nav{gap:20px;font-size:16px}.site-header nav a:last-child{display:none}.hero{padding:40px 0;position:relative}.hero h1{font-size:48px;letter-spacing:-1.5px}.hero-description{font-size:19px}.hero-art{position:absolute;width:180px;right:0;top:36px;opacity:.16;z-index:-1}.eyebrow{font-size:14px}.view-bar{display:block;padding:16px 0}.view-switch{width:100%}.view-switch button{flex:1;font-size:16px;padding:10px 7px}.view-switch button span{margin-right:4px}.view-hint{display:block;max-width:none;margin-top:12px;font-size:16px}.era-heading{display:block;margin-top:33px}.era-heading h2{font-size:34px}.era-meta{text-align:left;display:flex;flex-wrap:wrap;gap:5px 20px;margin-top:18px}.era-meta span{font-size:16px!important}.timeline-key{display:block;line-height:1.6}.timeline-key span:last-child{display:block;margin:0;font-size:15px}.timeline{height:auto;margin:32px 0 30px;padding-bottom:30px}.timeline-path{display:none}.timeline:before{content:'';position:absolute;left:22px;top:0;bottom:30px;border-left:2px solid var(--copper)}.timeline-people{display:grid;gap:26px}.timeline-item{position:relative;top:auto;left:auto;transform:none;width:100%;padding-left:58px}.person-card{height:auto;min-height:158px;display:grid;grid-template-columns:90px 1fr;grid-template-rows:auto auto auto;column-gap:18px;text-align:left;align-content:center;justify-items:start;padding-bottom:22px;border-bottom:1px solid var(--line)}.portrait{width:90px;height:90px;grid-row:1/4}.person-name,.concept-name{margin:0 0 6px;font-size:29px}.card-detail{font-size:16px;line-height:1.4}.card-date{font-size:16px;line-height:1.4;margin-top:9px}.node{top:58px;left:-42px;width:13px;height:13px}.node:before{height:1px;width:20px;left:11px;bottom:4px}.hover-info{top:85%;left:0;transform:translateY(6px);width:min(300px,100%)}.person-card:hover .hover-info,.person-card:focus-visible .hover-info{transform:translateY(0)}.hover-info:before{left:35px}.timeline[data-view=concepts] .concept-icon{width:90px;height:90px;grid-row:1/4;font-size:43px}.timeline[data-view=concepts] .concept-name{font-size:25px}.timeline-continuation{position:relative;top:auto;left:auto;max-width:none;margin:36px 0 0 58px}.timeline-continuation p{font-size:26px;line-height:1.3;margin-bottom:8px}.timeline-continuation .eyebrow{font-size:13px}.today{position:relative;display:block;top:auto;right:auto;margin:28px 0 0 58px}.about{grid-template-columns:1fr;gap:25px;padding-top:32px}.about h2{font-size:31px}.about h2 br{display:none}footer{flex-wrap:wrap;gap:14px}footer>span{display:none}.footer-brand{font-size:19px}.person-hero{grid-template-columns:1fr 110px;gap:16px;padding-top:30px;align-items:start}.person-hero h1{font-size:43px}.person-hero figure{padding-top:28px}.person-hero img{width:110px;height:110px;padding:4px}.person-hero figcaption{font-size:14px;line-height:1.4}.person-meta{font-size:17px}.person-meta span{display:none}.person-meta{max-width:250px}.detail-lead{font-size:21px}.person-hero>div{display:contents}.person-hero .eyebrow,.person-hero h1,.person-hero .person-meta{grid-column:1;grid-row:auto}.person-hero figure{grid-column:2;grid-row:1/4}.detail-lead,.text-link{grid-column:1/-1}.person-hero h1{margin:0}.detail-lead{margin-top:5px}.text-link{margin-top:0}.life-section{grid-template-columns:1fr;gap:22px}.life-section h2{max-width:none}.lesson{padding-top:43px}.lesson h2{font-size:34px}.lesson-intro>p:not(.eyebrow){font-size:19px}.demo{padding:20px 16px}.two-controls{gap:24px;grid-template-columns:1fr}.equation{font-size:29px}.demo-controls:has(select){display:grid;gap:14px}.square-layout{grid-template-columns:1fr;gap:25px;padding:26px 0 8px}.square-grid{max-width:285px}.square-layout .equation{text-align:center;font-size:35px}.square-layout p{text-align:center}.square-layout p:not(.equation){margin-top:12px}.pi-layout{grid-template-columns:1fr;gap:0}.pi-layout svg{max-width:370px}.pi-readings{padding:0 8px 15px}.pi-readings output{font-size:36px}.interactive-svg text{font-size:24px}.construction-footer{gap:18px}.construction-footer p{font-size:19px}.step-heading{font-size:16px}.quiet-button{font-size:16px}.takeaway{font-size:19px;padding:18px}.other-ideas{margin-top:45px}.other-ideas>div{grid-template-columns:1fr;gap:25px}.historical-note{padding:23px}.historical-note a{overflow-wrap:anywhere}.next-person strong{font-size:26px}.next-person a{font-size:16px}.fraction-bar{height:70px}.fraction-bar>.piece{font-size:20px}.proof-equation{font-size:20px}}
@media(max-width:390px){.hero h1{font-size:41px}.view-switch button{font-size:15px}.view-switch button span{display:none}.person-card{grid-template-columns:70px 1fr;column-gap:12px}.portrait{width:70px;height:70px}.person-name{font-size:26px}.timeline[data-view=concepts] .concept-icon{width:70px;height:70px}.timeline[data-view=concepts] .concept-name{font-size:24px}.person-hero h1{font-size:36px}.person-hero{grid-template-columns:1fr 92px}.person-hero img{width:92px;height:92px}}
.person-card::after{content:'';position:absolute;top:100%;left:50%;transform:translateX(-50%);height:26px;width:min(302px,100%)}.extra-concept{display:none}.timeline[data-view=concepts] .extra-concept{display:block;position:absolute;top:263px;left:0;width:100%;text-align:center;color:var(--copper);font-size:17px}.timeline[data-view=concepts] .concept-icon{height:100px;width:100px}.timeline[data-view=concepts] .concept-name{font-size:26px;line-height:1.1;margin:10px 0 4px}.brand,.eyebrow,.hover-info strong,.takeaway span,.card-detail{font-size:16px}.person-hero figcaption{font-size:16px}
@media(max-width:760px){.brand{font-size:14px}.eyebrow{font-size:16px;letter-spacing:1.5px}.timeline-continuation .eyebrow,.timeline-key span:last-child{font-size:16px}.timeline[data-view=concepts] .extra-concept{position:static;text-align:left;padding:12px 0}.timeline[data-view=concepts] .concept-icon{width:90px;height:90px}.timeline[data-view=concepts] .concept-name{font-size:25px;margin:0 0 6px}.interactive-svg text{font-size:32px}.person-hero figcaption{font-size:16px}.view-switch button{font-size:16px}}
@media(max-width:390px){.timeline[data-view=concepts] .concept-icon{width:70px;height:70px}.timeline[data-view=concepts] .concept-name{font-size:24px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}