:root{color-scheme:light;--paper:#fff;--surface:#f7f7f4;--ink:#182126;--muted:#58646a;--line:#d9ddd9;--line-strong:#b9c0bd;--accent:#c64f18;--accent-dark:#8f350f;--focus:#0b6e69;--max-width:1180px;font-synthesis:none;text-rendering:optimizelegibility;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{background:var(--paper);color:var(--ink);scroll-behavior:smooth}body{min-width:320px;margin:0;font-size:17px;line-height:1.65}img{max-width:100%;display:block}a{color:inherit;text-underline-offset:.18em;text-decoration-thickness:1px}a:focus-visible,button:focus-visible{outline:3px solid var(--focus);outline-offset:4px}.skip-link{z-index:20;background:var(--ink);color:#fff;padding:.7rem 1rem;position:fixed;top:.75rem;left:.75rem;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.site-header,.site-footer,.shell{width:min(calc(100% - 2.5rem), var(--max-width));margin-inline:auto}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:2rem;min-height:92px;display:flex}.brand{text-decoration:none;display:inline-flex}.brand img{width:206px;height:auto}.site-header nav,.site-footer nav{align-items:center;gap:1.5rem;font-size:.88rem;font-weight:650;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}.hero{grid-template-columns:minmax(0,1.65fr) minmax(260px,.7fr);align-items:end;gap:clamp(3rem,8vw,7rem);padding-block:clamp(5rem,10vw,8.5rem);display:grid}.eyebrow,.label,.problem-number{color:var(--accent-dark);letter-spacing:.09em;text-transform:uppercase;margin:0 0 1rem;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.74rem;font-weight:700}h1,h2,h3,p{margin-top:0}h1,h2,h3{letter-spacing:-.035em;line-height:1.08}h1{max-width:850px;margin-bottom:1.6rem;font-size:clamp(3rem,6.7vw,6.2rem);font-weight:720}h2{font-size:clamp(2rem,4vw,3.5rem)}h3{font-size:1.42rem}.lede{max-width:720px;color:var(--muted);margin-bottom:2.2rem;font-size:clamp(1.08rem,1.8vw,1.32rem);line-height:1.58}.hero-actions{flex-wrap:wrap;gap:.8rem;display:flex}.button{border:1px solid var(--ink);justify-content:center;align-items:center;min-height:48px;padding:.68rem 1.05rem;font-size:.9rem;font-weight:700;text-decoration:none;display:inline-flex}.button-primary{background:var(--ink);color:#fff}.button-secondary{background:0 0}.principle{border-top:3px solid var(--accent);border-left:1px solid var(--line);padding:1.5rem 0 0 1.5rem}.principle p{margin-bottom:0;font-size:1.02rem}.problem-section{border-top:1px solid var(--line-strong);padding-block:5rem}.section-heading{max-width:660px;margin-bottom:2.6rem}.problem-grid{border-top:1px solid var(--line-strong);border-left:1px solid var(--line-strong);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.problem-card{border-right:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong);background:#ffffff94;min-height:285px;padding:clamp(1.4rem,3.5vw,2.25rem);text-decoration:none}.problem-card:hover{background:var(--surface)}.problem-card p{max-width:480px;color:var(--muted)}.text-link{color:var(--accent-dark);margin-top:1.5rem;font-size:.86rem;font-weight:750;display:inline-block}.proof{border-top:1px solid var(--line-strong);grid-template-columns:repeat(3,1fr);padding-block:4rem 6rem;display:grid}.proof div{gap:.4rem;padding-right:2rem;display:grid}.proof strong{font-size:2.8rem;line-height:1}.proof span{color:var(--muted);font-size:.9rem}.site-footer{border-top:1px solid var(--line-strong);color:var(--muted);justify-content:space-between;gap:2rem;padding-block:2.5rem 3.5rem;font-size:.82rem;display:flex}.site-footer p{margin-bottom:0}.breadcrumbs{color:var(--muted);padding-top:1.5rem;font-size:.78rem}.breadcrumbs ol{flex-wrap:wrap;gap:.55rem;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs li:not(:last-child):after{content:"/";color:var(--line-strong);margin-left:.55rem}.page-intro{max-width:var(--max-width);border-bottom:1px solid var(--line-strong);padding-block:clamp(4.5rem,9vw,7.5rem)}.page-intro h1{max-width:980px;font-size:clamp(2.8rem,6vw,5.6rem)}.page-intro.flush{width:100%;margin:0;padding:0 0 2rem}.reading-layout{max-width:820px;padding-block:4rem 7rem}.reading-layout>section,.reading-layout>aside{margin-top:4rem}.reading-layout h2{margin-bottom:1rem;font-size:clamp(1.6rem,3vw,2.35rem)}.reading-layout li+li{margin-top:.5rem}.book-list{padding-block:1rem 7rem}.book-card{border-bottom:1px solid var(--line-strong);grid-template-columns:190px minmax(0,1fr);gap:clamp(1.5rem,4vw,3.5rem);padding-block:3rem;display:grid}.book-card h2{margin-bottom:.55rem;font-size:clamp(1.7rem,3vw,2.5rem)}.book-card h2 a,.book-cover-link{text-decoration:none}.book-card img{border:1px solid var(--line);width:190px;height:auto}.book-subtitle,.book-page-subtitle{color:var(--ink);font-weight:650}.book-card>div>p:last-of-type{color:var(--muted)}.book-page{padding-bottom:7rem}.book-hero{border-bottom:1px solid var(--line-strong);grid-template-columns:minmax(220px,.55fr) minmax(0,1.45fr);align-items:center;gap:clamp(2.5rem,7vw,6.5rem);padding-block:clamp(4rem,8vw,7rem);display:grid}.book-hero h1,.guide-header h1{font-size:clamp(2.7rem,5.5vw,5rem)}.book-hero-cover{border:1px solid var(--line-strong);width:100%;height:auto;box-shadow:0 22px 45px #1821261f}.book-page-subtitle{max-width:740px;font-size:1.18rem;line-height:1.5}.audience{color:var(--muted);font-size:.92rem}.edition-meta{grid-template-columns:repeat(4,minmax(0,1fr));gap:.75rem;margin:1.5rem 0;display:grid}.edition-meta div{border-top:1px solid var(--line);padding-top:.65rem}.edition-meta dt{color:var(--muted);letter-spacing:.07em;text-transform:uppercase;font-size:.68rem;font-weight:700}.edition-meta dd{overflow-wrap:anywhere;margin:.2rem 0 0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78rem}.fit-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:2rem;display:grid}.fit-grid>div{border:1px solid var(--line-strong);padding:1.5rem}.fit-grid h2{font-size:1.35rem}.guide-list{padding-block:4rem 7rem}.section-note{max-width:680px;color:var(--muted)}.guide-row{border-top:1px solid var(--line-strong);grid-template-columns:minmax(0,1fr) minmax(280px,.8fr);gap:2rem;padding-block:2rem;display:grid}.guide-row h3{margin-bottom:0}.guide-row h3 a{text-decoration:none}.guide-row>p{color:var(--muted)}.guide-header{border-bottom:1px solid var(--line-strong);padding-bottom:3rem}.article-meta{grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem;margin:2.5rem 0 0;display:grid}.article-meta div{border-top:1px solid var(--line-strong);padding-top:.75rem}.article-meta dt{color:var(--muted);letter-spacing:.07em;text-transform:uppercase;font-size:.7rem;font-weight:700}.article-meta dd{margin:.2rem 0 0;font-size:.82rem}.direct-answer{background:var(--surface);border-left:4px solid var(--accent);padding:1.6rem}.single-book-cta{border:1px solid var(--line-strong);padding:1.5rem}.guide-content>:first-child{margin-top:4rem}.guide-content h2{margin-top:4rem;margin-bottom:1rem;font-size:clamp(1.6rem,3vw,2.35rem)}.guide-content table{border-collapse:collapse;width:100%;font-size:.92rem}.guide-content th,.guide-content td{border:1px solid var(--line-strong);text-align:left;vertical-align:top;padding:.75rem}.guide-content th{background:var(--surface)}.reading-path{background:var(--line-strong);gap:1px;padding:1px;list-style-position:inside;display:grid}.reading-path li{background:var(--paper);grid-template-columns:minmax(180px,.65fr) minmax(0,1.35fr);gap:1.2rem;margin:0;padding:1rem 1.2rem;display:grid}.reading-path span,.muted{color:var(--muted)}.evidence-list{padding-left:1.25rem}.evidence-list li{border-top:1px solid var(--line);padding:1.25rem 0 1.25rem .5rem}.faq-list div{border-top:1px solid var(--line);padding:1.25rem 0}.faq-list dt{font-weight:750}.faq-list dd{color:var(--muted);margin:.4rem 0 0}.editorial-record{color:var(--muted);font-size:.84rem}.resource-grid{background:var(--line-strong);grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;margin-bottom:7rem;padding:1px;display:grid}.resource-card{background:var(--paper);min-height:300px;padding:clamp(1.5rem,4vw,2.5rem)}.resource-card h2{font-size:clamp(1.6rem,3vw,2.25rem)}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr));padding-block:3rem 7rem;display:grid}.topic-card{border-right:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong);min-height:245px;padding:2rem;text-decoration:none}.topic-card:nth-child(odd){border-left:1px solid var(--line-strong)}.topic-card:nth-child(-n+2){border-top:1px solid var(--line-strong)}.topic-card:hover{background:var(--surface)}.topic-card h2{font-size:1.65rem}.topic-card p{color:var(--muted)}.topic-page{padding-top:5rem}.numbered-sections{counter-reset:method}.numbered-sections section{counter-increment:method;padding-left:3.2rem;position:relative}.numbered-sections section:before{color:var(--accent-dark);content:counter(method, decimal-leading-zero);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:700;position:absolute;top:.25rem;left:0}.not-found{min-height:68vh;padding-block:7rem}.not-found h1{max-width:900px}.kindle-cta{flex-wrap:wrap;align-items:center;gap:1rem;margin-top:1.5rem;display:flex}.kindle-unavailable{color:var(--muted);font-size:.9rem}@media (width<=760px){.site-header{flex-direction:column;align-items:flex-start;padding-block:1.25rem}.site-header nav{gap:1rem;width:100%;overflow-x:auto}.hero{grid-template-columns:1fr;gap:3rem}.problem-grid,.proof,.topic-grid,.resource-grid,.fit-grid,.edition-meta,.article-meta,.book-card,.book-hero,.guide-row,.reading-path li{grid-template-columns:1fr}.book-card img{width:min(180px,45vw)}.book-hero-cover{width:min(300px,75vw)}.topic-card,.topic-card:nth-child(odd),.topic-card:nth-child(-n+2){border-top:0;border-left:1px solid var(--line-strong)}.topic-card:first-child{border-top:1px solid var(--line-strong)}.proof{gap:2.25rem}.site-footer{flex-direction:column;align-items:flex-start}.site-footer nav{flex-wrap:wrap;align-items:flex-start}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}