:root{--ink:#161a1e;--blue:#2b668f;--muted:#4a525b;--paper:#f5f5f2;--line:#d2d8dc}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);font:15px/1.75 'Public Sans',sans-serif;color:var(--ink)}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:5px}a:focus-visible,summary:focus-visible{outline:3px solid #4e9cd2;outline-offset:5px}.wrap{max-width:1240px;margin:auto;padding-left:44px;padding-right:44px}header{background:#111315;color:#fff}.header-inner{max-width:1320px;margin:auto;display:flex;align-items:center;gap:24px;padding:18px 44px}header img{width:170px;height:auto;display:block}.divider{width:1px;height:36px;background:#42474b}.brand{font:600 20px/1 'Barlow Condensed',sans-serif;letter-spacing:1px}nav{display:flex;align-items:center;gap:28px;margin-left:auto;font-size:12px}.outline{border:1px solid #7f898f;padding:10px 16px}.outline span{padding-left:24px}h1,h2,h3{font-family:'Barlow Condensed',sans-serif;font-weight:700;line-height:1.02;letter-spacing:-.5px;margin:0}h1{font-size:clamp(70px,7.7vw,104px)}h1 span,h2 span{color:var(--blue)}h2{font-size:48px}.eyebrow{font:400 10px/1.7 'IBM Plex Mono',monospace;letter-spacing:1.6px;color:var(--muted);margin:0 0 24px}.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--blue);margin-right:8px;vertical-align:middle}.hero{display:grid;grid-template-columns:1fr 1.1fr;gap:55px;align-items:center;padding-top:72px;padding-bottom:76px}.subtitle{font-size:18px;line-height:1.5;max-width:450px;margin:27px 0 19px}.byline{font:500 11px/1.8 'IBM Plex Mono',monospace;letter-spacing:.7px;margin:0 0 20px}.byline span{display:block;color:var(--muted);font-size:10px;font-weight:400}.intro{font-size:13px;color:var(--muted);max-width:400px;margin:0}.actions{display:flex;flex-wrap:wrap;gap:25px;align-items:center;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:32px;padding:14px 20px;font-size:12px;font-weight:600;background:var(--blue);color:#fff;border:1px solid var(--blue)}.button:hover{background:#235372;text-decoration:none}.text-link{display:inline-flex;gap:25px;align-items:center;font-size:12px;font-weight:600}.kindle-link{display:block;font-size:10px;color:var(--muted);margin-top:17px;width:fit-content}.book-display{background:#e4eaec;border:1px solid #c8d2d8;padding:22px 20px 20px;align-self:stretch;display:flex;flex-direction:column;justify-content:space-between;min-width:0}.display-label,.display-bottom{display:flex;justify-content:space-between;gap:15px;font:8px 'IBM Plex Mono',monospace;letter-spacing:1px;color:#42647c}.display-bottom{border-top:1px solid #c6d1d7;padding-top:17px;font-size:7px}.book-image{width:115%;height:auto;max-width:none;margin:28px -7.5% 24px;filter:drop-shadow(0 20px 16px #52616b22)}.audience{background:var(--ink);color:#fff}.audience-inner{padding-top:27px;padding-bottom:27px;display:flex;align-items:center;justify-content:space-between;gap:25px}.audience span{font:10px 'IBM Plex Mono',monospace;letter-spacing:1px;color:#a4b4bf}.audience p{font-size:12px;margin:0}.audience i{font-style:normal;color:#6f8595;margin:0 16px}.perspective{display:grid;grid-template-columns:1fr 1fr;gap:80px;padding-top:88px;padding-bottom:88px}.perspective-copy{max-width:455px}.perspective-copy p{font-size:14px;color:var(--muted);margin:17px 0 0}.perspective-copy .lead{font-size:20px;line-height:1.55;color:var(--ink);margin:0 0 23px}.concepts{background:#e8edef;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.concept-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:90px;padding-top:78px;padding-bottom:78px}.concept-intro>p:not(.eyebrow){font-size:13px;color:var(--muted);max-width:290px;margin:25px 0}.topic-list{border-bottom:1px solid #b9c7d0}details{border-top:1px solid #b9c7d0}summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:17px;padding:24px 0}summary::-webkit-details-marker{display:none}summary h3{font-size:25px;line-height:1.1}.number{font:10px 'IBM Plex Mono',monospace;color:var(--blue);white-space:nowrap}.toggle{margin-left:auto;width:14px;height:14px;position:relative;flex:0 0 14px}.toggle:before,.toggle:after{content:'';position:absolute;background:var(--blue);width:12px;height:1px;left:1px;top:6px}.toggle:after{transform:rotate(90deg)}details[open] .toggle:after{transform:none}.topic-body{padding:0 25px 23px 42px;font-size:13px;color:var(--muted)}.topic-body p{margin:0 0 13px}.topic-body p:last-child{margin-bottom:0}.author{display:grid;grid-template-columns:.7fr 1.3fr;gap:90px;align-items:center;padding-top:88px;padding-bottom:88px}.author-photo{background:#e4e8e8;padding:18px;max-width:340px}.author-photo img{display:block;width:100%;height:auto;filter:grayscale(15%)}.author-photo>span{font:7px 'IBM Plex Mono',monospace;display:block;letter-spacing:.7px;margin-top:17px;color:var(--muted)}.author-copy .eyebrow{margin-bottom:18px}.credentials{font:11px/1.8 'IBM Plex Mono',monospace;color:var(--blue);margin:18px 0 23px}.credentials span{display:block;font-size:9px;color:var(--muted);letter-spacing:.8px;margin-top:5px}.author-copy>p:not(.eyebrow):not(.credentials){font-size:14px;color:var(--muted);max-width:550px;margin:13px 0}.author-copy .text-link{margin-top:13px}.family{background:#fff;border-top:1px solid var(--line);padding:56px 0 62px}.family-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:28px}.family-heading h2{font-size:35px}.family-heading .eyebrow{margin:0;font-size:9px;max-width:230px}.family-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}.family-item{display:block;border-top:2px solid var(--blue);background:#f2f4f4;padding:26px 27px}.family-item:hover{text-decoration:none;background:#e8eef1}.family-item .eyebrow{font-size:8px;margin-bottom:18px}.family-item h3{font-size:29px;display:flex;justify-content:space-between;gap:18px}.family-item h3 span{font:20px 'Public Sans',sans-serif;color:var(--blue)}.family-item p{font-size:12px;color:var(--muted);margin:16px 0 25px;max-width:440px}.family-link{font-size:11px;font-weight:600;color:var(--blue)}.get-book{background:var(--ink);color:#fff;padding:65px 0}.get-inner{display:grid;grid-template-columns:1fr 1fr;gap:110px;align-items:center}.get-book .eyebrow{color:#afc1cd}.get-book h2{font-size:54px}.get-book h2 span{color:#74a6c8}.get-actions>p{font-size:16px;color:#cad2d7;max-width:340px;line-height:1.65;margin:0 0 26px}.button.light{background:#eef3f5;color:var(--ink);border-color:#eef3f5}.button.light:hover{background:#fff}.get-actions .kindle-link{color:#cad2d7;margin-top:20px}.contact{display:flex;justify-content:space-between;gap:35px;align-items:center;padding-top:45px;padding-bottom:45px}.contact .eyebrow{margin-bottom:12px}.contact-email{font-size:18px;font-weight:500;overflow-wrap:anywhere}.contact-email span{margin-left:20px;color:var(--blue)}footer{background:#111315;color:#a8b1b8;font-size:9px}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:25px;padding-top:30px;padding-bottom:30px}.footer-brand{font:600 20px 'Barlow Condensed',sans-serif;letter-spacing:.7px;color:#fff}footer p{margin:4px 0 0}.footer-links{display:flex;gap:22px;flex-wrap:wrap}.skip{position:absolute;top:-80px;padding:10px;background:#fff;z-index:5}.skip:focus{top:0}@media(max-width:1000px){.wrap{padding-left:28px;padding-right:28px}.header-inner{padding:18px 28px;gap:20px}nav{gap:20px}nav>a:not(.outline){display:none}.hero{gap:35px}h1{font-size:78px}.subtitle{font-size:16px}.hero .eyebrow{font-size:8px}.book-image{width:124%;margin-left:-12%;margin-right:-12%}.book-display{padding:20px 15px}.display-label{font-size:7px}.perspective,.author{gap:50px}.concept-grid{gap:50px}.audience-inner{display:block}.audience p{margin-top:12px}.family-heading{display:block}.family-heading .eyebrow{max-width:none;margin-bottom:17px}.family-item{padding:23px}.get-inner{gap:60px}.get-book h2{font-size:47px}.footer-inner{flex-wrap:wrap}.footer-links{gap:18px}}@media(max-width:650px){.wrap{padding-left:22px;padding-right:22px}.header-inner{padding:15px 22px;gap:15px}header img{width:130px}.brand{font-size:17px}.divider{height:30px}nav{display:none}.hero{grid-template-columns:1fr;gap:36px;padding-top:42px;padding-bottom:43px}h1{font-size:clamp(64px,14.4vw,82px)}.hero .eyebrow{font-size:9px}.subtitle{font-size:17px;margin-top:24px}.intro{font-size:14px}.byline{font-size:12px}.byline span{font-size:10px}.book-display{padding:22px 18px 18px;overflow:hidden}.book-image{width:115%;margin:22px -7.5% 16px}.display-label{font-size:8px}.display-bottom{font-size:7px}.actions{gap:23px}.kindle-link{font-size:11px}.audience-inner{padding-top:25px;padding-bottom:25px}.audience span{font-size:9px}.audience p{font-size:12px;line-height:2}.audience i{margin:0 6px}.perspective,.concept-grid,.author,.get-inner{grid-template-columns:1fr;gap:30px}.perspective,.author{padding-top:54px;padding-bottom:54px}h2{font-size:42px}.perspective-copy .lead{font-size:19px}.concept-grid{padding-top:53px;padding-bottom:53px}.concept-intro>p:not(.eyebrow){max-width:none;font-size:14px}.concept-intro h2 br:nth-child(2){display:none}.concept-intro h2 span:before{content:' '}.topic-list{margin-top:5px}summary{gap:14px;padding:23px 0}summary h3{font-size:24px}.topic-body{padding-left:36px;padding-right:15px;font-size:14px}.author-photo{max-width:280px;margin-bottom:5px}.author-copy h2{font-size:46px}.author-copy>p:not(.eyebrow):not(.credentials){font-size:14px}.family{padding:45px 0}.family-heading h2{font-size:34px}.family-grid{grid-template-columns:1fr;gap:22px}.family-item p{font-size:13px}.family-item h3{font-size:28px}.get-book{padding:49px 0}.get-book h2{font-size:46px}.get-actions>p{font-size:15px}.contact{display:block;padding-top:35px;padding-bottom:35px}.contact-email{font-size:16px}.contact>.text-link{margin-top:24px}.footer-inner{display:block}.footer-links{margin:23px 0}.footer-inner>p{margin-top:20px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}