:root{--ink:#17211d;--muted:#54655d;--paper:#f4f1e9;--surface:#fffdf8;--surface-strong:#ebe8de;--line:#cfd7d1;--line-dark:#9eada5;--accent:#173f35;--accent-2:#2d6857;--accent-soft:#dce9e3;--serif:Georgia, "Times New Roman", serif}*{box-sizing:border-box}html{background:var(--paper);color:var(--ink);scroll-behavior:smooth}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.62}a{color:var(--accent);text-underline-offset:3px}a:hover{color:var(--accent-2)}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline-offset:3px;outline:3px solid #c87d36}button,input{font:inherit}.shell{width:min(1240px,100% - 48px);margin:0 auto}.site-header{border-bottom:1px solid var(--line);background:#f4f1e9f7}.masthead{justify-content:space-between;align-items:center;gap:28px;min-height:78px;display:flex}.imprint{color:var(--accent);font-family:var(--serif);white-space:nowrap;align-items:center;gap:11px;font-size:19px;font-weight:700;text-decoration:none;display:inline-flex}.imprint-mark{border:1px solid var(--accent);letter-spacing:.08em;place-items:center;width:32px;height:32px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:10px;font-weight:800;display:grid}.desktop-nav{align-items:center;gap:clamp(16px,2vw,29px);font-size:13px;display:flex}.desktop-nav a{color:var(--ink);text-decoration:none}.desktop-nav a:hover{color:var(--accent);text-decoration:underline}.desktop-nav .nav-access{color:var(--accent);font-weight:750}.mobile-nav{display:none;position:relative}.mobile-nav summary{cursor:pointer;color:var(--accent);font-weight:750;list-style:none}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav nav{z-index:10;background:var(--surface);border:1px solid var(--line);min-width:230px;padding:10px;display:grid;position:absolute;top:40px;right:0;box-shadow:0 16px 40px #173f351f}.mobile-nav nav a{color:var(--ink);padding:9px 11px;text-decoration:none}.book-hero{grid-template-columns:minmax(240px,300px) minmax(380px,1fr) minmax(280px,325px);grid-template-areas:"cover copy purchase";align-items:start;gap:clamp(34px,4vw,64px);padding:78px 0 94px;display:grid}.hero-copy{grid-area:copy}.hero-copy h1{max-width:780px;font-family:var(--serif);letter-spacing:-.047em;text-wrap:balance;margin:14px 0 20px;font-size:clamp(46px,5vw,72px);font-weight:600;line-height:.98}.eyebrow,.section-label{color:var(--accent-2);letter-spacing:.15em;text-transform:uppercase;margin:0;font-size:12px;font-weight:800}.book-subtitle{max-width:690px;color:var(--accent);font-family:var(--serif);margin:0 0 22px;font-size:clamp(21px,2.25vw,30px);line-height:1.25}.byline{flex-wrap:wrap;gap:5px 22px;margin:0 0 31px;font-size:14px;display:flex}.byline span{color:var(--muted)}.hero-description{color:#34433d;max-width:720px;font-size:15px}.hero-description p{margin:0 0 15px}.book-cover-wrap{perspective:1000px;grid-area:cover;margin:2px 0 0}.book-cover{isolation:isolate;color:#f9f4e8;background:#173f35;border:1px solid #0c2a22;flex-direction:column;min-height:465px;padding:29px 27px 25px;display:flex;position:relative;overflow:hidden;transform:rotateY(1.5deg);box-shadow:-9px 12px #d4d2c8,0 26px 50px #102b2333}.book-cover:before{content:"";z-index:-1;background:#0000002e;width:7px;position:absolute;inset:0 auto 0 0}.book-cover:after{content:"";pointer-events:none;border:9px solid #ffffff09;position:absolute;inset:0}.cover-grid{z-index:-1;opacity:.8;position:absolute;inset:155px 14px 46px}.cover-grid svg{width:100%;height:100%}.cover-grid path,.cover-grid line{fill:none;stroke:#b9d7c8;stroke-width:1.1px;vector-effect:non-scaling-stroke}.cover-grid path+path{stroke:#d9ab72;opacity:.85}.cover-grid circle{fill:#f4f1e9}.cover-kicker{color:#c9ded4;letter-spacing:.16em;text-transform:uppercase;font-size:9px;font-weight:800}.cover-title{font-family:var(--serif);letter-spacing:-.035em;margin-top:22px;font-size:clamp(28px,2.7vw,38px);line-height:.98}.cover-subtitle{color:#d9e5df;width:88%;margin-top:19px;font-size:12px;line-height:1.38}.cover-footer{justify-content:space-between;align-items:end;gap:12px;margin-top:auto;font-size:11px;display:flex}.cover-footer strong{font-family:var(--serif);text-align:right}.book-cover-wrap figcaption{color:var(--muted);text-align:center;gap:5px;margin-top:20px;font-size:11px;display:grid}.cover-isbn{color:var(--ink);font-variant-numeric:tabular-nums;letter-spacing:.025em;font-size:12px}.purchase-card{background:var(--surface);border:1px solid var(--line-dark);border-top:5px solid var(--accent);grid-area:purchase;padding:28px;box-shadow:0 18px 50px #173f3514}.purchase-card p{font-size:14px}.purchase-label{color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin:0;font-weight:800;font-size:11px!important}.price{font-family:var(--serif);margin:5px 0 13px;font-size:45px;line-height:1}.button{border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;text-align:center;border-radius:2px;justify-content:center;align-items:center;width:100%;min-height:48px;padding:12px 19px;font-weight:750;text-decoration:none;display:inline-flex}.button:hover{color:#fff;background:#0e3028}.button:disabled,.button-unavailable{cursor:not-allowed;color:#f7f7f5;background:#aeb8b3;border-color:#aeb8b3}.button-unavailable:hover{color:#f7f7f5;background:#aeb8b3}.button.secondary{background:var(--accent-soft);color:var(--accent)}.button+.button{margin-top:10px}.purchase-format{color:var(--muted);margin-bottom:10px;font-size:12px!important}.purchase-access{font-size:13px;font-weight:700;display:inline-block}.checkout-note{border-top:1px solid var(--line);color:var(--muted);margin:18px 0 0;padding-top:14px;font-size:11px!important}.availability-title{font-family:var(--serif);margin:8px 0 15px;font-size:34px;line-height:1.05}.prelaunch-card>p:not(.purchase-label,.purchase-format){color:#34433d}.prelaunch-actions{gap:10px;margin-top:20px;display:grid}.prelaunch-actions .button+.button{margin-top:0}.editorial-section{border-top:1px solid var(--line);padding:88px 0;scroll-margin-top:22px}.editorial-section h2{max-width:780px;font-family:var(--serif);letter-spacing:-.035em;text-wrap:balance;margin:8px 0 23px;font-size:clamp(34px,4vw,52px);font-weight:600;line-height:1.05}.editorial-section h3{font-family:var(--serif);margin:0 0 8px;font-size:20px;line-height:1.2}.section-intro{max-width:650px;color:var(--muted);margin:-8px 0 34px;font-size:17px}.section-intro.wide{max-width:890px}.about-grid{grid-template-columns:.85fr 1.15fr;gap:clamp(50px,8vw,110px);display:grid}.prose{max-width:680px;font-family:var(--serif);font-size:18px;line-height:1.72}.prose>p:first-child{margin-top:0}.equation{background:var(--surface);border-left:3px solid var(--accent);font-family:var(--serif);text-align:center;margin:28px 0;padding:20px;font-size:32px}.equation-sequence{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px 16px;font-size:clamp(17px,2vw,23px);display:flex}.equation-sequence b{color:var(--accent-2);font-family:ui-sans-serif,system-ui,sans-serif;font-weight:500}.next-release-section{grid-template-columns:.85fr 1.15fr;align-items:start;gap:clamp(50px,8vw,110px);display:grid}.next-release-section h2{margin-bottom:0}.chapter-number{color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin:25px 0 -2px;font-size:13px;font-weight:800}.next-release-card{background:var(--surface);border:1px solid var(--line-dark);padding:28px}.next-release-card dl{margin:0 0 20px}.next-release-card dl div{border-bottom:1px solid var(--line);grid-template-columns:1fr auto;gap:20px;padding:11px 0;display:grid}.next-release-card dt{color:var(--muted)}.next-release-card dd{text-align:right;margin:0;font-weight:800}.next-release-card p{color:var(--muted);margin:14px 0 0;font-size:14px}.learning-grid{border-top:1px solid var(--line-dark);grid-template-columns:repeat(2,1fr);gap:0 46px;margin:0;padding:0;list-style:none;display:grid}.learning-grid li{border-bottom:1px solid var(--line);grid-template-columns:42px 1fr;gap:10px;padding:24px 0;display:grid}.learning-grid li>span{color:var(--accent-2);font-family:var(--serif);font-size:15px}.learning-grid p{max-width:510px;margin:0}.schedule-copy{max-width:480px;color:var(--muted);margin-bottom:25px}.schedule-copy p{margin:0 0 10px}.roadmap-list{border:1px solid var(--line-dark);grid-template-columns:repeat(5,1fr);gap:0;margin:10px 0 0;padding:0;list-style:none;display:grid}.roadmap-list li{border-right:1px solid var(--line);min-width:0;padding:23px 20px}.roadmap-list li:last-child{border-right:0}.roadmap-list h3{overflow-wrap:anywhere;margin-top:8px;font-size:18px}.roadmap-list p{color:var(--muted);margin:8px 0 0;font-size:13px}.roadmap-chapter-number{letter-spacing:.08em;text-transform:uppercase;font-weight:800;color:var(--accent)!important;font-size:11px!important}.roadmap-access{font-weight:750;color:var(--accent)!important}.status-badge{border:1px solid var(--line-dark);letter-spacing:.07em;text-transform:uppercase;border-radius:999px;width:fit-content;padding:3px 8px;font-size:10px;font-weight:800;line-height:1.4;display:inline-flex}.status-available{background:var(--accent);border-color:var(--accent);color:#fff}.status-next{color:#65491d;background:#e9dfcf;border-color:#c5a978}.status-planned{background:var(--surface);color:var(--muted)}.toc-section{padding-bottom:98px}.section-heading-row{justify-content:space-between;align-items:end;gap:40px;display:flex}.section-heading-row>p{max-width:380px;color:var(--muted);margin:0 0 28px}.toc-list{border-top:1px solid var(--line-dark)}.toc-list details{border-bottom:1px solid var(--line-dark)}.toc-list details+details{border-top:1px solid var(--line-dark);margin-top:14px}.toc-list summary,.faq-list summary{cursor:pointer;list-style:none;position:relative}.toc-list summary::-webkit-details-marker{display:none}.faq-list summary::-webkit-details-marker{display:none}.toc-list summary{font-family:var(--serif);justify-content:space-between;gap:25px;padding:26px 50px 26px 0;font-size:23px;font-weight:600;display:flex}.toc-list summary:after,.faq-list summary:after{content:"+";color:var(--accent);font-family:ui-sans-serif,system-ui,sans-serif;font-weight:400;position:absolute;right:8px}.toc-list details[open] summary:after,.faq-list details[open] summary:after{content:"−"}.toc-count{color:var(--muted);white-space:nowrap;font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px}.toc-list ol{margin:-5px 0 20px;padding:0 25px 0 58px}.toc-list li{border-top:1px solid var(--line);padding:16px 0 16px 9px}.toc-list li::marker{color:var(--accent);font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;font-weight:800}.toc-list li strong{font-family:var(--serif);font-size:18px}.toc-chapter-heading{justify-content:space-between;align-items:start;gap:20px;display:flex}.toc-list li p{max-width:850px;color:var(--muted);margin:6px 0 0;font-size:14px}.toc-formula{background:var(--surface);color:var(--accent);font-family:var(--serif);margin-top:9px;padding:5px 10px;font-size:14px;font-style:italic;display:inline-block}.approach-section{background:var(--accent);color:#f4f1e9;margin-inline:calc(50% - 50vw);padding-inline:max(24px,50vw - 620px)}.approach-section .section-label{color:#b9d7c8}.approach-section .section-intro{color:#dce5e1}.approach-flow{counter-reset:approach;grid-template-columns:repeat(7,1fr);margin:45px 0 0;padding:0;list-style:none;display:grid}.approach-flow li{min-height:105px;font-family:var(--serif);border-top:1px solid #8daf9f;border-right:1px solid #b9d7c83d;padding:35px 15px 12px;font-size:15px;line-height:1.3;position:relative}.approach-flow li:before{counter-increment:approach;content:counter(approach, decimal-leading-zero);color:#b9d7c8;letter-spacing:.08em;font-family:ui-sans-serif,system-ui,sans-serif;font-size:10px;position:absolute;top:7px}.audience-grid{border-top:1px solid var(--line-dark);grid-template-columns:repeat(2,1fr);gap:0 55px;display:grid}.audience-grid article{border-bottom:1px solid var(--line);padding:29px 0}.audience-grid p{max-width:530px;color:var(--muted);margin-bottom:0}.author-section{max-width:760px}.author-section>p:not(.section-label){max-width:700px;font-family:var(--serif);font-size:18px}.author-links{flex-wrap:wrap;gap:18px;display:flex}.placeholder-note{color:var(--muted);font-family:ui-sans-serif,system-ui,sans-serif!important;font-size:13px!important}.early-access-section{display:block}.steps-grid{grid-template-columns:repeat(4,1fr);gap:26px;margin:36px 0 0;padding:0;list-style:none;display:grid}.steps-grid li{grid-template-columns:31px 1fr;gap:13px;display:grid}.steps-grid li>span{border:1px solid var(--accent);width:29px;height:29px;color:var(--accent);border-radius:50%;place-items:center;font-size:12px;font-weight:800;display:grid}.steps-grid h3{font-family:ui-sans-serif,system-ui,sans-serif;font-size:15px}.steps-grid p{color:var(--muted);margin:0;font-size:14px}.early-access-note{background:var(--accent-soft);border-left:3px solid var(--accent);max-width:760px;padding:17px 19px;font-size:14px}.release-status{background:var(--surface);border:1px solid var(--line-dark);grid-template-columns:10px 1fr;gap:16px;padding:27px;display:grid}.status-dot{background:#4a8b67;border-radius:50%;width:9px;height:9px;margin-top:5px;box-shadow:0 0 0 4px #dce9e3}.status-dot-upcoming{background:#b7873f;box-shadow:0 0 0 4px #eee2ce}.release-status h3{margin-top:7px;font-size:25px}.release-status dl{margin:22px 0 0}.release-status dl div{border-top:1px solid var(--line);grid-template-columns:1fr 1fr;gap:12px;padding:10px 0;font-size:13px;display:grid}.release-status dt{color:var(--muted)}.release-status dd{text-align:right;margin:0;font-weight:700}.status-empty,.release-note{color:var(--muted);font-size:13px}.status-empty{margin-top:18px}.status-empty strong{color:var(--ink);margin-bottom:7px;font-size:15px;display:block}.status-empty p{margin:0}.release-note{border-top:1px solid var(--line);padding-top:14px}.sample-section{justify-content:space-between;align-items:center;gap:50px;display:flex}.sample-section h2{margin-bottom:14px}.sample-section p:last-child{max-width:650px;color:var(--muted);margin-bottom:0}.button-inline{width:auto;min-width:220px}.faq-section{grid-template-columns:.7fr 1.3fr;gap:70px;display:grid}.faq-section>.section-label{grid-column:1}.faq-section>h2{grid-column:1;margin-top:-55px}.faq-list{border-top:1px solid var(--line-dark);grid-area:1/2/span 2}.faq-list details{border-bottom:1px solid var(--line-dark)}.faq-list summary{padding:20px 45px 20px 0;font-weight:700}.faq-list p{max-width:650px;color:var(--muted);margin:-2px 0 22px}.final-cta{border:1px solid var(--line-dark);background:#e3e9e4;margin:15px 0 100px;padding:50px}.purchase-card-compact{box-shadow:none;background:0 0;border:0;grid-template-columns:1fr auto;grid-template-areas:"title label""title price""form access";gap:5px 35px;padding:0;display:grid}.purchase-card-compact h2{max-width:650px;font-family:var(--serif);grid-area:title;align-self:center;margin:0;font-size:clamp(30px,4vw,48px);line-height:1.05}.purchase-card-compact .purchase-label{grid-area:label}.purchase-card-compact .price{grid-area:price}.purchase-card-compact form{grid-area:form}.purchase-card-compact .purchase-access{white-space:nowrap;grid-area:access;align-self:center}.prelaunch-card-compact{box-shadow:none;background:0 0;border:0;grid-template-columns:minmax(260px,1fr) minmax(280px,.8fr);grid-template-areas:"title label""title actions";gap:8px 40px;padding:0;display:grid}.prelaunch-card-compact h2{max-width:650px;font-family:var(--serif);grid-area:title;align-self:center;margin:0;font-size:clamp(30px,4vw,48px);line-height:1.05}.prelaunch-card-compact .purchase-label{grid-area:label}.prelaunch-card-compact .prelaunch-actions{grid-area:actions;margin-top:12px}.narrow{max-width:650px;margin:0 auto;padding:90px 0}.narrow h1{font-family:var(--serif);letter-spacing:-.04em;margin:18px 0 22px;font-size:clamp(42px,7vw,66px);line-height:1}.dek{max-width:680px;color:var(--muted);font-size:clamp(18px,2.5vw,23px)}.form{gap:14px;margin-top:30px;display:grid}.form label{font-weight:700}.form input{background:#fff;border:1px solid #8e9e96;border-radius:3px;width:100%;padding:13px 14px}.notice{background:var(--accent-soft);border-radius:3px;padding:16px}.error{color:#692b21;background:#f6e3df;border-radius:3px;padding:16px}.site-footer{border-top:1px solid var(--line-dark);background:#e8e6de}.footer{color:var(--muted);justify-content:space-between;gap:40px;padding:40px 0 55px;font-size:13px;display:flex}.footer strong{color:var(--accent);font-family:var(--serif);font-size:18px}.footer p{margin:7px 0 0}.footer nav{gap:22px;display:flex}@media (max-width:1080px){.book-hero{grid-template-columns:minmax(230px,280px) 1fr;grid-template-areas:"cover copy""cover purchase"}.purchase-card{align-self:start}.steps-grid{grid-template-columns:repeat(2,1fr)}.approach-flow{grid-template-columns:repeat(4,1fr)}.approach-flow li:nth-child(4){border-right:0}.desktop-nav{display:none}.mobile-nav{display:block}}@media (max-width:760px){.shell{width:min(100% - 32px,620px)}.masthead{min-height:68px}.book-hero{grid-template-columns:1fr;grid-template-areas:"copy""cover""purchase";gap:42px;padding:52px 0 72px}.hero-copy h1{font-size:clamp(43px,13vw,62px)}.book-subtitle{font-size:23px}.book-cover-wrap{width:min(82vw,315px);margin-inline:auto}.book-cover{min-height:475px}.editorial-section{padding:67px 0}.about-grid,.early-access-section,.author-section,.faq-section,.next-release-section{grid-template-columns:1fr;gap:35px}.learning-grid,.audience-grid,.steps-grid,.roadmap-list{grid-template-columns:1fr}.roadmap-list li{border-right:0;border-bottom:1px solid var(--line)}.roadmap-list li:last-child{border-bottom:0}.section-heading-row,.sample-section{flex-direction:column;align-items:start}.toc-list ol{columns:1;padding-left:40px}.toc-list summary{font-size:18px}.toc-count{display:none}.approach-section{padding-inline:16px}.approach-flow{grid-template-columns:repeat(2,1fr)}.approach-flow li:nth-child(4){border-right:1px solid #b9d7c83d}.approach-flow li:nth-child(2n){border-right:0}.faq-section>.section-label,.faq-section>h2,.faq-list{grid-area:auto/1}.faq-section>h2{margin-top:-30px}.purchase-card-compact,.prelaunch-card-compact{display:block}.purchase-card-compact .price{margin:15px 0}.purchase-card-compact .purchase-access{white-space:normal;margin-top:15px}.final-cta{margin-bottom:70px;padding:30px 24px}.footer{flex-direction:column}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
