@charset "UTF-8";
:root{--ink:#173e35;--text:#455d55;--muted:#52685d;--green:#26785d;--mint:#eaf2ec;--line:#dbe4dc;--gold:#eab65e;--paper:#fbfcf9;color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:120px}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 "Segoe UI",Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,a{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
a:focus-visible,input:focus-visible{outline:3px solid #a8650a;outline-offset:5px}
input[type=range]{accent-color:var(--green);min-height:44px;cursor:pointer}
h1,h2,h3,p{margin-top:0}
.wrap,.head-inner,.hero-inner{width:min(1220px,calc(100% - 80px));margin:auto}
.skip{position:absolute;left:16px;top:-80px;z-index:200;background:white;padding:12px}
.skip:focus{top:12px}
.site-head{position:sticky;top:0;z-index:20;background:#fbfcf9f2;backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.head-inner{min-height:108px;display:flex;align-items:center;justify-content:space-between;gap:30px;padding:14px 0}
.brand{display:flex;align-items:center;gap:12px;font-size:38px;font-weight:750;letter-spacing:-1.7px;line-height:1;flex-shrink:0}
.brand img{object-fit:contain;width:68px;height:68px}
.brand small{display:block;font-size:14px;letter-spacing:2px;font-weight:600;margin-top:10px;line-height:1.3}
.site-head nav{display:flex;align-items:center;gap:30px;font-size:16px;font-weight:600}
.site-head nav>a:hover{color:#24755b}
.site-head nav .nav-start{background:var(--ink);color:white;padding:13px 22px;border-radius:8px}
.nav-start span{margin-left:16px}
.hero{background:linear-gradient(115deg,#f2f5eb 0%,#f6f8f1 55%,#eaf2e9 100%);overflow:hidden;border-bottom:1px solid var(--line)}
.hero-inner{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;gap:64px;padding:76px 0 80px}
.hero-copy{min-width:0}
.eyebrow{font-size:14px;font-weight:700;letter-spacing:1.1px;line-height:1.7;margin-bottom:23px}
.eyebrow>span{display:inline-block;background:#42846b;width:7px;height:7px;border-radius:50%;margin-right:6px}
.hero h1{font-size:clamp(46px,4.7vw,68px);letter-spacing:-2.6px;line-height:1.08;font-weight:650;margin-bottom:25px}
.hero h1 em,.approach-title em{font-family:Georgia,"Times New Roman",serif;font-weight:500;color:#297d60;letter-spacing:-2px}
.brand-motto{margin:0 0 24px;border-left:3px solid var(--gold);padding-left:17px}
.brand-motto p{font-family:Georgia,"Times New Roman",serif;font-size:clamp(23px,2.1vw,29px);line-height:1.4;color:var(--ink);margin:0}
.brand-motto span{display:block;font-size:15px;color:var(--muted);margin-top:6px}
.hero-description{max-width:490px;font-size:18px;line-height:1.8;color:var(--text);margin-bottom:28px}
.hero-actions{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.button{display:inline-flex;align-items:center;gap:24px;padding:16px 22px;border-radius:8px;font-size:16px;font-weight:650}
.primary{background:var(--ink);color:white;box-shadow:0 5px 12px #173e3512}
.plain-link{font-size:16px;text-decoration:underline;text-underline-offset:5px;line-height:1.6}
.hero-foot{font-size:14px;color:var(--muted);display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:27px;line-height:1.6}
.language-dot{width:6px;height:6px;border-radius:50%;background:var(--green);flex-shrink:0}
.sep{margin:0 3px;color:#64786a}
.hero-lab{position:relative;min-width:0;background:#fff;border:1px solid #d6e2d8;border-radius:20px;padding:28px 30px 0;box-shadow:0 23px 60px #234c3611;margin-right:13px}
.lab-heading{font-size:14px;letter-spacing:1px;font-weight:650;display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--line);padding-bottom:20px;color:#4e6858}
.live-dot{width:7px;height:7px;background:#4a9a70;border-radius:50%;flex-shrink:0}
.lab-number{margin-left:auto;color:#5c7463}
.lab-question{padding-top:25px}
.lab-question>span{font-size:20px}
.lab-question h2{font-size:30px;letter-spacing:-.8px;line-height:1.25;margin:3px 0 13px;font-weight:650}
.lab-question p{font-size:16px;line-height:1.7;color:var(--muted);margin-bottom:25px}
.fraction-row{display:flex;align-items:center;gap:18px;margin:21px 0;font-size:21px;font-weight:650}
.fraction-row>span{min-width:44px;font-variant-numeric:tabular-nums}
.whole{position:relative;height:40px;border:1px solid #aac1b1;flex:1;background:#f0f5ee;overflow:hidden;border-radius:3px}
.whole>div{height:100%;background:#4d936f;transition:width .15s}
.whole>span{position:absolute;inset:0;background:repeating-linear-gradient(90deg,transparent 0 calc(25% - 1px),#aac1b1 calc(25% - 1px) 25%)}
.whole #fractionTicks{background:repeating-linear-gradient(90deg,transparent 0 calc(var(--part,12.5%) - 1px),#aac1b1 calc(var(--part,12.5%) - 1px) var(--part,12.5%))}
.lab-controls{padding-top:6px}
.lab-controls label{font-size:16px;color:#405d4b}
.lab-controls input{display:block;width:100%;margin:4px 0 12px}
.lab-result{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;border-radius:8px;background:#f4f6f0;padding:15px 17px;gap:12px}
.lab-result span{font-size:15px;line-height:1.65;color:var(--muted)}
.lab-result output{font-size:28px;white-space:nowrap;font-family:Georgia,serif}
.lab-link{display:flex;justify-content:space-between;gap:10px;padding:20px 0;font-size:16px;font-weight:600}
.lab-sticker{position:absolute;right:-29px;top:-38px;background:var(--gold);color:#44341e;border-radius:50%;width:90px;height:90px;text-align:center;display:flex;align-items:center;justify-content:center;font-weight:650;font-size:15px;line-height:1.35;transform:rotate(9deg);box-shadow:0 4px 8px #60522d0d}
.principles{display:flex;justify-content:center;flex-wrap:wrap;gap:24px 55px;padding:27px 25px;border-bottom:1px solid var(--line);background:white;font-size:16px;font-weight:600}
.principles b{color:#55705f;font-size:14px;margin-right:10px;font-weight:500}
.apps-section{padding-top:77px;padding-bottom:85px}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:40px;margin-bottom:32px}
.section-heading .eyebrow{margin-bottom:11px;color:#4a6e56}
.section-heading h2{font-size:35px;letter-spacing:-1.1px;line-height:1.25;font-weight:650;margin:0}
.section-heading>p{max-width:340px;margin:0;color:var(--muted);font-size:17px;line-height:1.75}
.apps{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.app-card{min-width:0;border:1px solid #d4e0d5;border-radius:16px;background:white;padding:30px;display:flex;flex-direction:column}
.card-heading{display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:12px;margin-bottom:23px}
.app-icon{font-family:Georgia,serif;background:#e6f0e7;width:44px;height:44px;border-radius:11px;display:grid;place-items:center;font-size:27px;color:#34785d}
.card-kicker{font-size:14px;letter-spacing:.5px;line-height:1.5;font-weight:650}
.app-index{font-family:Georgia,serif;color:#5a7460;font-size:22px}
.app-card h3{font-size:32px;letter-spacing:-1px;line-height:1.25;font-weight:650;margin-bottom:15px}
.app-card>p{font-size:17px;line-height:1.8;color:var(--text);margin-bottom:24px;max-width:480px}
.angle-stage{background:#f4f7ef;border:1px solid #e0e8dc;border-radius:9px;padding:12px 16px;min-height:285px}
.angle-stage svg{display:block;width:100%;height:auto;aspect-ratio:500/210;min-height:160px}
.mini-controls{display:grid;grid-template-columns:1fr auto;align-items:center;column-gap:16px;font-size:15px}
.mini-controls label{line-height:1.6}
.mini-controls input{grid-column:1/-1;grid-row:2;width:100%;margin:4px 0 0;min-width:0}
.mini-controls output{grid-column:2;grid-row:1;text-align:right}
.card-tags{display:flex;flex-wrap:wrap;gap:8px;margin:23px 0}
.card-tags span{font-size:14px;line-height:1.5;background:#f0f5ef;padding:7px 10px;border-radius:4px;color:#45604c}
.open-app{display:flex;align-items:center;justify-content:space-between;padding:17px 0;border-top:1px solid #d7e4d7;font-size:18px;font-weight:650;margin-top:auto}
.open-app span{font-size:24px}
.scope{font-size:14px;line-height:1.6;color:var(--muted)}
.misconceptions{background:#214c41;border-color:#214c41;color:#fff}
.misconceptions .app-icon{background:#3b6355;color:#e9cc8b}
.misconceptions .app-index{color:#bed4c7}
.misconceptions>p{color:#e2eae5}
.thinking-stage{min-height:285px;border-radius:9px;background:#193e34;border:1px solid #426251;padding:24px}
.thought-label{font-size:14px;letter-spacing:.8px;line-height:1.5;color:#bed4c7}
.thinking-stage blockquote{font-family:Georgia,serif;font-size:30px;line-height:1.35;margin:17px 0;color:#fff7e5}
.thought-equations{display:flex;gap:12px;flex-wrap:wrap;font-size:21px;font-variant-numeric:tabular-nums}
.thought-equations span{background:#2d5144;padding:8px 14px;border-radius:5px}
.thought-equations b{color:#f0cf8a;font-weight:600}
.thinking-stage p{font-size:15px;color:#d2e0d7;line-height:1.7;margin:15px 0 0}
.misconceptions .card-tags span{background:#31594a;color:#e4ede1}
.misconceptions .open-app{border-color:#4b6e5c}
.misconceptions .scope{color:#c9dbce}
.approach{background:#eef3e9;border-top:1px solid #e0e8da;border-bottom:1px solid #e0e8da;padding:67px 0}
.approach-inner{display:grid;grid-template-columns:1fr 1.1fr;gap:80px}
.approach-title .eyebrow{color:#4f6b52;margin-bottom:22px}
.approach-title h2{font-size:45px;letter-spacing:-1.7px;line-height:1.13;font-weight:600;margin-bottom:22px}
.approach-title>p:last-child{font-size:17px;line-height:1.8;color:var(--text);max-width:380px}
.approach-steps{list-style:none;margin:0;padding:0;display:grid;gap:27px;align-content:center}
.approach-steps li{display:flex;gap:20px}
.approach-steps li>span{display:grid;place-items:center;flex-shrink:0;width:40px;height:40px;border:1px solid #b9cab5;border-radius:50%;font-size:14px;color:#4c6b4a}
.approach-steps h3{font-size:19px;line-height:1.4;font-weight:650;margin:4px 0 8px}
.approach-steps p{font-size:17px;color:var(--text);line-height:1.75;max-width:440px;margin:0}
.source-note{padding-top:44px;padding-bottom:44px;display:grid;grid-template-columns:38px minmax(0,1fr) auto;align-items:center;gap:25px}
.source-symbol{font-size:35px;color:#5e7c58}
.source-note h2{font-size:22px;line-height:1.4;font-weight:650;margin-bottom:8px}
.source-note p{font-size:16px;color:var(--muted);line-height:1.8;max-width:660px;margin:0}
.source-note>a{font-size:16px;text-decoration:underline;text-underline-offset:5px;max-width:210px}
footer{border-top:1px solid var(--line);background:white;padding:35px 0}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.footer-inner .brand{font-size:32px}
.footer-inner .brand img{width:58px;height:58px}
.footer-inner p{font-size:16px;font-weight:600;line-height:1.8;margin:0}
.footer-inner p span{font-size:15px;font-weight:400;color:var(--muted)}
.footer-inner>div{display:grid;gap:12px;font-size:16px}
.open-app:hover,.lab-link:hover{color:#a66c1b}
.misconceptions .open-app:hover{color:#f0cf8a}
.primary:hover,.nav-start:hover{filter:brightness(1.12)}
@media(max-width:1100px){
 .hero-inner{gap:38px}.hero h1{font-size:54px}.hero-lab{padding:25px 24px 0}
 .principles{gap:20px 30px}.app-card{padding:24px}.approach-inner{gap:50px}
 .source-note{grid-template-columns:30px minmax(0,1fr)}.source-note>a{grid-column:2;max-width:none}
}
@media(max-width:980px){
 .hero-inner{grid-template-columns:1fr;gap:60px;padding:54px 0 60px}
 .hero-copy{max-width:650px}.hero h1{font-size:clamp(48px,7.5vw,68px)}
 .hero-description{max-width:600px}.hero-lab{max-width:600px;width:calc(100% - 20px);margin:0 10px}
 .section-heading{display:block}.section-heading>p{max-width:640px;margin-top:18px}
 .apps{grid-template-columns:1fr}.app-card{padding:30px}.app-card>p{max-width:650px}
 .angle-stage{min-height:0}.angle-stage svg{height:230px;aspect-ratio:auto}
 .thinking-stage{min-height:0}.approach-inner{grid-template-columns:1fr;gap:30px}
 .approach-title>p:last-child{max-width:650px}.approach-steps p{max-width:620px}
 .site-head nav{gap:20px}
}
@media(max-width:740px){
 html{scroll-padding-top:105px}.wrap,.head-inner,.hero-inner{width:calc(100% - 40px)}
 .head-inner{min-height:90px;gap:12px;padding:12px 0}.brand{font-size:32px;letter-spacing:-1.4px;gap:8px}
 .brand img{width:54px;height:54px}.brand small{font-size:14px;letter-spacing:1.6px;margin-top:8px}
 .site-head nav{font-size:16px}.site-head nav>a:not(.nav-start){display:none}
 .site-head nav .nav-start{padding:11px 14px}.nav-start span{margin-left:8px}
 .hero-inner{padding:40px 0 45px;gap:60px}.eyebrow{font-size:14px;letter-spacing:.7px}
 .hero h1{font-size:clamp(42px,10vw,62px);letter-spacing:-1.8px}
 .hero-description{font-size:18px}.hero-actions{gap:20px}.hero-foot{font-size:14px}
 .hero-lab{padding:25px 20px 0}.lab-sticker{right:-12px;top:-37px;width:82px;height:82px;font-size:14px}
 .lab-heading{letter-spacing:.5px;padding-right:40px}.lab-number{display:none}
 .lab-question h2{font-size:29px}.lab-result{padding:14px}.lab-result output{font-size:29px}
 .principles{display:grid;grid-template-columns:1fr 1fr;gap:20px 12px;padding:26px 20px;font-size:15px}
 .principles span{display:flex;align-items:baseline}.principles b{margin-right:8px}
 .apps-section{padding:45px 0}.section-heading{margin-bottom:26px}.section-heading h2{font-size:30px}
 .apps{gap:24px}.app-card{padding:24px}.app-card h3{font-size:30px}.card-kicker{font-size:14px;letter-spacing:.3px}
 .angle-stage{padding:10px 12px}.angle-stage svg{height:190px}.card-tags{margin:22px 0}
 .thinking-stage{padding:20px}.thinking-stage blockquote{font-size:29px}
 .approach{padding:44px 0}.approach-title h2{font-size:40px}.approach-steps{gap:25px}
 .approach-steps li{gap:15px}.source-note{grid-template-columns:1fr;gap:18px;padding:32px 0}
 .source-symbol{display:none}.source-note>a{grid-column:1}.footer-inner{gap:27px}
 .footer-inner>div{width:100%;gap:14px}.footer-inner .brand{font-size:30px}.footer-inner .brand img{width:52px;height:52px}
}
@media(max-width:380px){
 .wrap,.head-inner,.hero-inner{width:calc(100% - 32px)}.head-inner{gap:8px}
 .brand{font-size:28px}.brand img{width:44px;height:44px}.brand small{letter-spacing:1.1px}
 .site-head nav .nav-start{padding:10px 12px;font-size:15px}.nav-start span{margin-left:6px}
 .hero h1{font-size:40px}.hero-lab{padding:24px 16px 0}.lab-heading{font-size:14px;letter-spacing:0}
 .app-card{padding:20px}.card-heading{grid-template-columns:38px minmax(0,1fr);gap:10px}.app-icon{width:38px;height:38px}.app-index{display:none}
 .app-card h3{font-size:28px}.thinking-stage{padding:16px}.thinking-stage blockquote{font-size:27px}
 .mini-controls{font-size:14px;column-gap:8px}.approach-steps li{gap:12px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}