:root{--paper:#f7f5ee;--ink:#183f35;--muted:#5d685f;--line:#d9ddd1;--sage:#e8ecdf;--rust:#a75032}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #be744a;outline-offset:5px}.wrap{width:min(1180px,calc(100% - 96px));margin-inline:auto}.header{padding:22px 48px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:1440px;margin:auto}.brand{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:600;line-height:1.4;white-space:nowrap}.brand 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#c8d0c1;padding-top:19px;display:flex;justify-content:space-between;gap:10px}.subject-card>a:hover{color:var(--rust)}.subject-note{font-size:11px;color:var(--muted);margin:23px 0 0}.about-section{background:#eceee4;padding-block:80px}.about-grid{display:grid;grid-template-columns:.8fr 1fr;gap:90px;align-items:center}.portrait{max-width:430px}.portrait img{width:100%;height:460px;object-fit:cover;object-position:50% 56%;display:block;filter:saturate(.78);border-radius:180px 180px 3px 3px}.portrait>span{display:flex;justify-content:space-between;margin-top:17px;font-size:9px;letter-spacing:1.5px}.portrait>span>span{color:var(--muted)}.about-copy>p:not(.eyebrow){color:var(--muted);font-size:14px;line-height:1.85}.about-copy h2{font-size:43px}.about-quote{font:21px/1.5 Georgia,serif;border-left:2px solid var(--rust);padding-left:23px;margin:25px 0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:45px;padding-top:10px}.steps article{border-top:1px solid 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0;accent-color:var(--ink);cursor:pointer}.range-ends{display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}.faq-grid{display:grid;grid-template-columns:.7fr 1.2fr;gap:100px}.faq-intro{font-size:14px;color:var(--muted)}details{border-bottom:1px solid var(--line)}details:first-child{border-top:1px solid var(--line)}summary{padding:22px 30px 22px 0;cursor:pointer;font-size:14px;position:relative;list-style:none}summary::-webkit-details-marker{display:none}summary:after{content:'+';position:absolute;right:2px;font-size:21px;top:16px;color:var(--rust)}details[open] summary:after{content:'−'}details p{font-size:13px;color:var(--muted);line-height:1.8;padding-right:20px;margin-bottom:22px}.contact-section{background:var(--ink);color:var(--paper);padding-block:80px}.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:100px}.contact-section .eyebrow{color:#c7d6bc}.contact-section h2{font-size:59px}.contact-section em{color:#ddbb87}.contact-section p:not(.eyebrow){font-size:14px;max-width:350px;color:#c4d0c3}.phone{font:25px Georgia;display:inline-block;margin-top:20px;border-bottom:1px solid #819788;padding-bottom:10px}.phone span{margin-left:35px}.contact-section .contact-note{font-size:11px;margin-top:13px}.contact-section form{background:#244b3e;padding:30px;border:1px solid #456153}.contact-section form h3{font-size:25px;margin-bottom:24px}form label{display:block;font-size:11px;margin-bottom:6px}form label span{color:#bfd0bd;font-size:10px}form input,form select,form textarea{display:block;width:100%;background:#f3f3e9;color:var(--ink);border:1px solid #a7b69e;border-radius:2px;padding:11px 12px;margin-bottom:17px;font-size:12px}form textarea{resize:vertical;min-height:90px}form .button{width:100%;margin-top:3px}.button.light{background:#e1bf8b;color:#153c30}.button.light:hover{background:#efd2a6}.text-alternative{display:block;text-align:center;text-decoration:underline;font-size:11px;margin-top:14px}.contact-section .form-note{font-size:10px;line-height:1.6;margin:14px 0 0;max-width:none;color:#bacbbb}.footer{padding-block:32px;display:flex;align-items:center;justify-content:space-between;gap:25px}.footer>p{font:italic 16px Georgia;margin:0}.footer>small{font-size:9px;color:var(--muted);text-align:right}.skip{position:absolute;left:15px;top:-80px;z-index:99;background:var(--ink);color:white;padding:10px}.skip:focus{top:10px}@media(min-width:1450px){.hero{padding-block:100px}}@media(max-width:1000px){.wrap{width:calc(100% - 60px)}.header{padding-inline:30px}.header nav{gap:18px}.hero{gap:35px}.hero h1{font-size:60px}.hero-art{padding:18px}.credentials-inner{gap:20px}.credentials-inner div+div{padding-left:20px}.credentials strong{font-size:11px}.about-grid,.demo-grid,.faq-grid,.contact-grid{gap:45px}.subject-card{padding:24px 18px}.about-copy h2{font-size:36px}.contact-section h2{font-size:50px}.footer>p{display:none}}@media(max-width:720px){html{scroll-padding-top:25px}.wrap{width:calc(100% - 40px)}.header{padding:18px 20px}.header nav>a:not(.button){display:none}.header .brand{font-size:15px}.brand small{font-size:7px}.header .button{padding:10px 13px;font-size:11px;gap:15px}.hero{grid-template-columns:1fr;gap:40px;padding-block:45px}.hero h1{font-size:60px;letter-spacing:-3px}.hero-detail{max-width:100%}.hero .eyebrow{font-size:8px;letter-spacing:1.5px}.hero-art{max-width:440px;width:100%;margin:0 auto}.hero-art svg{max-height:290px}.credentials-inner{grid-template-columns:1fr;padding-block:10px;gap:0}.credentials-inner div,.credentials-inner div+div{padding:13px 0;border-left:0;display:flex;align-items:center;justify-content:space-between;gap:20px}.credentials-inner div+div{border-top:1px solid var(--line)}.credentials span{font-size:7px;letter-spacing:.7px;margin:0;max-width:105px}.credentials strong{font-size:11px;text-align:right}.section{padding-block:55px}.section-head{display:block;margin-bottom:30px}.section-head>p{margin-top:20px;max-width:100%}.eyebrow{margin-bottom:17px}.subject-grid,.about-grid,.steps,.demo-grid,.faq-grid,.contact-grid{grid-template-columns:1fr;gap:30px}.subject-card{padding:26px}.subject-symbol{height:58px}.subject-card p:not(.eyebrow){min-height:0}.subject-card h3{font-size:28px}.subject-card ul{font-size:13px}.subject-card>a{font-size:12px}.about-section{padding-block:50px}.portrait{width:100%;max-width:380px;margin:auto}.portrait img{height:420px}.about-copy{margin-top:10px}.about-copy h2{font-size:36px}.steps{gap:28px}.steps article>span{margin-bottom:15px}.demo-section{padding-block:50px}.demo-grid{gap:20px}.demo-panel{padding:18px}.faq-grid{gap:20px}.contact-section{padding-block:50px}.contact-section h2{font-size:50px}.contact-section form{padding:22px}.footer{align-items:flex-start;padding-block:28px;flex-direction:column;gap:18px}.footer>small{text-align:left}.actions{gap:22px}.intro{font-size:19px}h2{font-size:39px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* Joe's Logic: flexible lessons and a small interactive idea lab. */
[hidden]{display:none!important}.portrait img{object-position:50% 35%;filter:saturate(.8)}.demo-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 35px;border-bottom:1px solid #cbd1c0;padding-bottom:15px}.demo-tabs button{border:1px solid #c6cfbc;background:transparent;color:var(--ink);font-size:12px;padding:12px 18px;cursor:pointer;border-radius:3px}.demo-tabs button[aria-selected=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}.demo-tabs button:hover{border-color:var(--ink)}.demo-grid h3{font-size:35px;line-height:1.2}.demo-grid{min-height:395px}.equation{font:24px/1.6 Georgia,serif;margin-bottom:12px;overflow-wrap:anywhere}.equation.advanced{font-size:18px;color:var(--rust);margin-bottom:20px}.demo-panel canvas{display:block;width:100%;height:auto;margin-block:15px}.physics-note{font-size:10px!important;margin:14px 0 0!important;color:var(--muted)}.rate-note{display:grid;grid-template-columns:1fr 1.8fr;gap:35px;background:var(--sage);border-left:2px solid var(--rust);padding:25px 28px;margin-top:40px}.rate-note strong{font:22px/1.4 Georgia,serif}.rate-note p{margin:0;font-size:13px;line-height:1.8;color:var(--muted)}.email-contact{display:block;width:fit-content;max-width:100%;overflow-wrap:anywhere;font-size:17px;margin-top:22px;border-bottom:1px solid #819788;padding-bottom:6px}.contact-methods{display:flex;gap:25px;margin-top:22px;font-size:13px}.contact-methods a:hover,.email-contact:hover{color:#ddbb87}.contact-section form{align-self:start}.formats{padding-bottom:35px}@media(max-width:720px){.demo-grid{min-height:0}.demo-tabs{gap:8px}.demo-tabs button{flex:1 1 140px;font-size:11px;padding:11px}.demo-grid h3{font-size:31px}.rate-note{grid-template-columns:1fr;gap:13px;padding:23px}.demo-heading{letter-spacing:.3px;font-size:8px}.demo-heading output{font-size:11px}.contact-grid{gap:35px}}
/* Portrait is cropped in layout; the original photo remains untouched. */
.portrait-crop{position:relative;aspect-ratio:740/900;overflow:hidden;border-radius:180px 180px 3px 3px;background:#dbe2d6}.portrait .portrait-crop img{position:absolute;width:159.324324%;max-width:none;height:auto;left:-33.783784%;top:-12.222222%;border-radius:0;object-fit:initial;filter:saturate(.8)}
.concept-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;align-items:start}.concept-card{min-width:0;background:var(--paper);border:1px solid #cfd5c5;border-radius:5px;overflow:hidden;box-shadow:0 4px 16px #183f3505}.concept-copy{padding:26px 23px 10px}.concept-copy .eyebrow{font-size:8px;letter-spacing:1.2px;margin-bottom:14px}.concept-copy h3{font-size:27px;line-height:1.15;min-height:63px}.concept-copy p:not(.eyebrow){font-size:12px;color:var(--muted);line-height:1.8;min-height:87px}.concept-copy .equation{font-size:21px;margin-bottom:10px}.concept-copy .equation.advanced{font-size:16px}.concept-card .demo-panel{border:0;border-top:1px solid #d9ddcf;padding:20px;background:transparent}.concept-card .demo-heading{font-size:8px;letter-spacing:.4px;align-items:flex-start;flex-wrap:wrap;gap:6px}.concept-card .demo-heading output{font-size:10px}.concept-card .demo-heading>span+span{font-size:8px;letter-spacing:0;color:var(--muted)}.concept-card canvas{margin-block:5px 15px}.concept-question{margin:0;padding:18px 22px;font:italic 15px/1.55 Georgia,serif;background:#e6eadc;color:#2e503d;border-top:1px solid #d0d9c6}.extra-control{margin-top:19px}.slice-result{background:#e9eddf;padding:12px 14px;margin-top:18px;border-left:2px solid var(--rust)}.slice-result strong{font:19px Georgia,serif}.slice-result p{font-size:11px;line-height:1.6;margin:8px 0 0;color:var(--muted)}.field-readings{margin-top:20px;display:grid;gap:12px;grid-template-columns:1fr}.field-readings>div{padding:10px 12px;background:#e9eddf}.field-readings span{display:block;font-size:8px;letter-spacing:1px;color:var(--muted)}.field-readings strong{font:18px Georgia,serif;display:block;margin-top:5px}.demo-section .section-head>p{max-width:350px}@media(max-width:1050px){.concept-cards{grid-template-columns:1fr;max-width:720px;margin:auto}.concept-card{display:grid;grid-template-columns:.9fr 1.1fr}.concept-copy{padding:28px 23px}.concept-card .demo-panel{border-top:0;border-left:1px solid #d9ddcf}.concept-question{grid-column:1/-1}.concept-copy h3,.concept-copy p:not(.eyebrow){min-height:0}.concept-card canvas{margin-block:15px}.concept-copy .equation{font-size:20px}}@media(max-width:640px){.concept-card{display:block}.concept-card .demo-panel{border-left:0;border-top:1px solid #d9ddcf}.concept-copy{padding:25px 23px 10px}.concept-copy h3{font-size:29px}.concept-copy p:not(.eyebrow){font-size:13px}.concept-cards{gap:28px}.field-readings{grid-template-columns:1fr 1fr}.field-readings strong{font-size:15px}}
/* Reading rhythm, consistent controls, and room for equations. */
h1,h2,h3{text-wrap:balance}p{overflow-wrap:break-word}.hero-detail{margin-bottom:13px;line-height:1.85}.hero-detail+.hero-detail{margin-top:0}.about-copy>p:not(.eyebrow){line-height:1.9;margin-bottom:18px;max-width:58ch}.about-copy h2{margin-bottom:29px}.about-quote{margin-block:29px}.section-head>p{line-height:1.85}.subject-card p:not(.eyebrow){font-size:14px;line-height:1.8}.subject-card li{padding-block:11px}.steps h3{margin-bottom:16px}.steps p{font-size:14px;line-height:1.85}.concept-copy{padding:29px 25px 15px}.concept-copy h3{margin-bottom:19px;line-height:1.2;letter-spacing:-.6px}.concept-copy p:not(.eyebrow){font-size:13px;line-height:1.85;margin-bottom:23px;min-height:0}.concept-copy .equation{line-height:1.75;margin-block:15px 10px}.concept-copy .equation.advanced{margin-top:7px;margin-bottom:8px;line-height:1.7}.concept-card .demo-panel{padding:23px}.concept-question{padding:22px 25px;line-height:1.65}.concept-card .demo-heading{line-height:1.6;gap:9px}.demo-heading output,.range-label output,.field-readings strong{font-variant-numeric:tabular-nums;white-space:nowrap}.range-label{align-items:center;gap:12px;line-height:1.6;font-size:11px}.range-label label{max-width:75%}.extra-control{margin-top:23px}.slice-result{margin-top:22px;padding:15px}.slice-result p{line-height:1.75;margin-top:10px;font-size:12px}.field-readings{gap:12px;margin-top:23px}.field-readings>div{padding:13px 14px}.field-readings strong{margin-top:9px}.physics-note{line-height:1.75!important;margin-top:18px!important}.faqs summary{padding-block:25px;font-size:15px;line-height:1.55}.faqs summary:after{top:23px}.faqs details p{font-size:14px;line-height:1.85;margin-bottom:26px;max-width:65ch}.rate-note p{font-size:14px;line-height:1.85}.contact-section form label{margin-bottom:9px;line-height:1.5}.contact-section form input,.contact-section form select,.contact-section form textarea{padding:13px;margin-bottom:21px;line-height:1.5}.contact-section form h3{margin-bottom:29px}
.demo-panel input[type=range]{appearance:none;-webkit-appearance:none;height:30px;padding:0;background:transparent;border:0;margin:10px 0 0;cursor:ew-resize;touch-action:pan-y;accent-color:var(--ink)}.demo-panel input[type=range]::-webkit-slider-runnable-track{height:5px;border-radius:6px;background:#cdd8c5}.demo-panel input[type=range]::-moz-range-track{height:5px;border-radius:6px;background:#cdd8c5}.demo-panel input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:19px;height:19px;border-radius:50%;margin-top:-7px;border:3px solid var(--paper);background:var(--ink);box-shadow:0 0 0 1px #718b76,0 2px 5px #183f3520}.demo-panel input[type=range]::-moz-range-thumb{width:13px;height:13px;border:3px solid var(--paper);border-radius:50%;background:var(--ink);box-shadow:0 0 0 1px #718b76}.demo-panel input[type=range]:active::-webkit-slider-thumb{background:var(--rust);box-shadow:0 0 0 1px var(--rust),0 0 0 6px #a7503210}.demo-panel input[type=range]:active::-moz-range-thumb{background:var(--rust)}
@media(max-width:720px){.hero-detail{font-size:14px}.section-head{margin-bottom:34px}.about-copy>p:not(.eyebrow){font-size:15px}.concept-copy{padding:27px 25px 15px}.concept-copy h3{min-height:0}.concept-copy p:not(.eyebrow){font-size:14px}.concept-question{font-size:16px}.contact-section form input,.contact-section form select,.contact-section form textarea{font-size:16px}.field-readings{grid-template-columns:1fr}.field-readings strong{font-size:18px}.demo-panel input[type=range]{height:36px}.steps{gap:34px}}

/* Consistent line icons replace font-dependent decorative glyphs. */
.subject-symbol{display:flex;align-items:flex-start;color:var(--ink);height:72px}.subject-symbol .line-icon{width:40px;height:40px;display:block}.idea-icon{display:flex;flex:0 0 36px;color:var(--ink)}.hero-art .idea-icon .line-icon{width:36px;height:36px;margin:0;display:block}
/* Direct contact appears before the long-form sections. */
.hero-art{transform:none}.header{position:sticky;top:0;z-index:20;background:#f7f5eef5;backdrop-filter:blur(12px)}.inline-contact{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:25px 0;border-top:1px solid var(--line);margin-top:30px}.inline-contact strong{font:25px/1.3 Georgia,serif;display:block}.inline-contact p{font-size:14px;line-height:1.7;color:var(--muted);margin:7px 0 0;max-width:570px}.inline-contact .contact-actions{display:flex;align-items:center;gap:22px;flex-shrink:0}.inline-contact .text-link{font-size:13px}.mobile-contact{display:none}@media(max-width:760px){.header nav>a:not(.button){display:none}.header{padding:16px 21px}.header .button{font-size:12px;padding:10px 12px}.inline-contact{flex-direction:column;align-items:flex-start;gap:18px}.inline-contact strong{font-size:24px}.mobile-contact{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;padding:12px 21px calc(12px + env(safe-area-inset-bottom));background:var(--paper);border-top:1px solid var(--line);align-items:center;justify-content:space-between;gap:16px}.mobile-contact>span{font-size:13px}.mobile-contact .button{font-size:13px;padding:10px 17px}.footer{padding-bottom:95px}html{scroll-padding-bottom:90px}}
/* The navigation scrolls naturally with the page. */
.header{position:static;backdrop-filter:none;background:var(--paper)}