:root{color-scheme:light;--bg:#fafafa;--ink:#171717;--muted:#525252;--line:#e5e5e5;--surface:#fff;--action:#171717;--action-ink:#fafafa;--focus:#171717;--error:#9f1239;--success:#166534;--display:"Geist", "Segoe UI", sans-serif;--reading:"Geist", "Segoe UI", sans-serif}@media (prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#0a0a0a;--ink:#f5f5f5;--muted:#a3a3a3;--line:#262626;--surface:#111;--action:#f5f5f5;--action-ink:#0a0a0a;--focus:#f5f5f5;--error:#fda4af;--success:#86efac}}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--bg);overflow-x:hidden}body{background:var(--bg);min-width:0;color:var(--ink);font-family:var(--reading);margin:0;font-size:1.05rem;line-height:1.6;overflow-x:hidden}a,button,input,label{touch-action:manipulation}img{max-width:100%;height:auto;display:block}a{color:inherit}button,input{font:inherit}:focus-visible{outline:2px solid var(--focus);outline-offset:3px}.skip-link{z-index:100;background:var(--action);color:var(--action-ink);padding:.65rem 1rem;text-decoration:none;position:fixed;top:1rem;left:1rem;transform:translateY(-200%)}.skip-link:focus{transform:translateY(0)}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;position:absolute!important}.site-header,.site-footer,main>:where(section,article,.page-shell){width:min(100% - 2rem,1120px);margin-inline:auto}.site-header{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem 1.5rem;min-height:4.5rem;display:flex}.brand{color:var(--ink);font:600 1rem/1 var(--display);letter-spacing:-.03em;text-decoration:none}.site-header nav,.site-footer nav{font:500 .92rem/1.2 var(--display);flex-wrap:wrap;gap:.4rem 1.1rem;display:flex}.site-header nav a,.site-footer nav a{text-decoration:none}.site-header nav a:hover,.site-footer nav a:hover{text-decoration:underline}h1,h2,h3{font-family:var(--display);letter-spacing:-.035em;text-wrap:balance;scroll-margin-top:1.5rem;font-weight:600;line-height:1.12}h1{margin:0 0 .8rem;font-size:clamp(2.2rem,4.6vw,3.6rem)}h2{margin:0 0 .8rem;font-size:clamp(1.45rem,2.4vw,2rem)}h3{font-size:1.15rem}p,li{max-width:65ch}.eyebrow,.book-type{color:var(--muted);font:500 .78rem/1.3 var(--display);letter-spacing:.08em;text-transform:uppercase;margin:0 0 .7rem}.home-hero{grid-template-columns:minmax(0,.88fr) minmax(360px,1.12fr);align-items:center;gap:2.5rem 5rem;min-height:calc(100svh - 4.5rem);padding-block:clamp(2.5rem,7vh,5rem);display:grid}.home-hero-copy{align-self:center}.home-hero-copy h1{max-width:13ch;font-size:clamp(2.6rem,5.5vw,4.9rem)}.home-hero-copy p{max-width:35rem;color:var(--muted)}.text-link{text-underline-offset:.2em;min-height:2.75rem;padding-block:.55rem;display:inline-block}.cover-pair{grid-template-columns:minmax(0,1.12fr) minmax(0,.78fr);align-items:end;gap:1.25rem;min-width:0;display:grid}.cover-choice{min-width:0}.cover-choice-ask{padding-bottom:clamp(1rem,7vw,5.5rem)}.cover-choice a:first-child{display:block}.cover-choice img{border:1px solid var(--line);width:100%}.cover-choice p{margin:.75rem 0 0;font-size:.9rem;line-height:1.4}.cover-choice p a{text-underline-offset:.18em;font-weight:500;text-decoration-thickness:1px}.home-section{border-top:1px solid var(--line);padding-block:clamp(4rem,9vw,7rem)}.book-choice,.delivery-steps{grid-template-columns:minmax(0,.9fr) minmax(300px,1.1fr);align-items:start;gap:2rem 5rem;display:grid}.choice-lines{border-top:1px solid var(--ink)}.choice-lines p{border-bottom:1px solid var(--line);justify-content:space-between;gap:1rem;max-width:none;margin:0;padding:1rem 0;display:flex}.choice-lines span{color:var(--muted);text-align:right}.delivery-steps ol{counter-reset:delivery;border-top:1px solid var(--ink);margin:0;padding:0;list-style:none}.delivery-steps li{border-bottom:1px solid var(--line);counter-increment:delivery;max-width:none;padding:1rem 0 1rem 2.5rem;position:relative}.delivery-steps li:before{content:counter(delivery);color:var(--muted);font-variant-numeric:tabular-nums;position:absolute;left:0}.sample-links{padding-bottom:clamp(4.5rem,10vw,8rem)}.cover-frame{width:min(100%,280px)}.cover-frame img{border:1px solid var(--line)}.subtitle{color:var(--muted);font:500 1.05rem/1.4 var(--display);margin:.6rem 0 1rem}.actions{flex-wrap:wrap;gap:.75rem;margin:1.5rem 0;display:flex}.button{border:1px solid var(--action);min-height:2.75rem;font:500 .95rem/1.2 var(--display);text-align:center;cursor:pointer;color:var(--ink);background:0 0;justify-content:center;align-items:center;padding:.65rem 1rem;text-decoration:none;display:inline-flex}.button.primary{background:var(--action);color:var(--action-ink)}.button.primary:hover{opacity:.88}.button[disabled],.button.disabled{cursor:not-allowed;opacity:.5}.content-section,.page-shell{padding-block:3rem 4.5rem}.split{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);align-items:start;gap:2rem 4rem;display:grid}.chapter-list{border-top:1px solid var(--line);margin:0;padding:0;list-style:none}.chapter-list li{border-bottom:1px solid var(--line);justify-content:space-between;gap:1rem;max-width:none;padding:.7rem 0;display:flex}.chapter-list span{color:var(--muted);font-family:var(--display);white-space:nowrap;font-size:.85rem}.reading{max-width:42rem}.reading h2{margin-top:2.4rem}.reading section{padding-top:.1rem}.product-detail{grid-template-columns:minmax(180px,240px) minmax(0,1fr);gap:2rem 3rem;margin-bottom:3.5rem;display:grid}.product-detail .cover-frame{align-self:start;position:sticky;top:1.5rem}.book-page{grid-template-columns:minmax(200px,280px) minmax(0,42rem);justify-content:space-between;gap:3rem clamp(3rem,8vw,8rem)}.book-kicker{color:var(--muted);margin:0 0 .8rem;font-size:.9rem}.book-intro{font-size:1.1rem}.chapter-use{padding-block:.2rem .6rem}.takeaway-list{padding-left:1.2rem}.takeaway-list li+li{margin-top:.55rem}.author-note{border-bottom:1px solid var(--line);padding-bottom:.7rem}.faq-section{border-top:1px solid var(--ink)}.faq-item{border-bottom:1px solid var(--line);padding-block:.1rem 1rem}.faq-item h3{margin-bottom:.35rem}.faq-item p{margin-top:0}.books-index{max-width:60rem}.index-intro{max-width:42rem;padding-bottom:2.5rem}.book-rows{border-top:1px solid var(--ink)}.book-row{border-bottom:1px solid var(--line);grid-template-columns:minmax(180px,260px) minmax(0,1fr);align-items:center;gap:2rem clamp(3rem,8vw,7rem);padding-block:clamp(3rem,8vw,6rem);display:grid}.book-row-reverse{grid-template-columns:minmax(0,1fr) minmax(180px,260px)}.book-row-reverse .cover-frame{order:2}.book-row-reverse .reading{order:1}.book-line{flex-wrap:wrap;gap:.35rem 1rem;display:flex}.book-line span{color:var(--muted)}.facts{border-block:1px solid var(--line);grid-template-columns:7rem 1fr;gap:.4rem 1rem;padding:1rem 0;display:grid}.facts dt{color:var(--muted);font:500 .85rem/1.4 var(--display)}.facts dd{margin:0}.owner-notice{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:1.5rem 0;padding:1rem 0}.owner-notice strong{font-family:var(--display);display:block}.preview-grid{grid-template-columns:repeat(3,1fr);gap:1rem;margin:2rem 0;display:grid}.preview-grid figure{margin:0}.preview-grid img{border:1px solid var(--line)}.preview-grid figcaption{color:var(--muted);margin-top:.45rem;font-size:.85rem}.prompt-sample{border-left:2px solid var(--ink);margin:1rem 0;padding:0 0 0 1rem}.sample-page>.reading+.reading{margin-top:2rem}.sample-embed{width:100%;max-width:46rem;margin-block:1rem 2rem}.sample-embed p{margin-bottom:.6rem}.sample-embed iframe{border:1px solid var(--line);background:var(--surface);width:100%;height:clamp(22rem,68vh,32rem);display:block}.checkout{grid-template-columns:minmax(0,1.1fr) minmax(240px,.8fr);gap:2rem 4rem;display:grid}.order-summary{border-top:1px solid var(--line);padding-top:.2rem}.order-summary img{border:1px solid var(--line);width:96px;margin-bottom:1rem}.field{gap:.4rem;margin:1.2rem 0;display:grid}.field label{font:500 .92rem/1.2 var(--display)}.field input{border:1px solid var(--line);background:var(--surface);min-height:2.9rem;color:var(--ink);padding:.6rem .75rem}.field .help,.status{color:var(--muted);font-size:.9rem}.status.error{color:var(--error)}.status.success{color:var(--success)}.site-footer{border-top:1px solid var(--line);grid-template-columns:1.2fr 1.4fr;gap:1.5rem;width:min(100% - 2rem,1120px);max-width:none;margin:0 auto;padding:2.5rem 0 3rem;display:grid}.site-footer p{color:var(--muted)}.footer-note{border-top:1px solid var(--line);grid-column:1/-1;margin:0;padding-top:1rem;font-size:.85rem}@media (width<=760px){.site-header{align-items:flex-start;padding-block:1rem}.home-hero,.book-choice,.delivery-steps,.book-row,.book-row-reverse,.product-detail,.checkout,.split,.site-footer{grid-template-columns:1fr}.home-hero{min-height:auto}.home-hero-copy h1{max-width:15ch}.cover-pair{width:min(100%,34rem)}.cover-choice-ask{padding-bottom:2rem}.book-row-reverse .cover-frame,.book-row-reverse .reading{order:initial}.product-detail .cover-frame{position:static}.book-page .cover-frame{width:min(62vw,240px)}.preview-grid{gap:.5rem}.preview-grid figcaption{font-size:.72rem;line-height:1.35}.footer-note{grid-column:auto}}@media (width>=760px){.sample-embed iframe{height:clamp(32rem,62vh,40rem)}}@media (width<=420px){.site-header nav{justify-content:space-between;gap:.35rem .7rem;width:100%}.site-header nav a{padding-block:.35rem}.actions{grid-template-columns:1fr;display:grid}.cover-choice p{font-size:.78rem}.choice-lines p{display:grid}.choice-lines span{text-align:left}.chapter-list li{align-items:start}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}