:root{--navy:#101d2e;--ink:#16253a;--muted:#637084;--cream:#f6f5f0;--line:#dde2e6;--blue:#7ab7ff;--green:#bfe5bc}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:#fff;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:focus-visible{outline:3px solid #287ac1;outline-offset:4px}.container{width:min(1140px,calc(100% - 48px));margin-inline:auto}.site-header{height:88px;width:min(1280px,calc(100% - 48px));margin:auto;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e7e9eb}.brand{display:flex;gap:11px;align-items:center;font-size:21px;font-weight:800;letter-spacing:-.9px}.brand-light{font-weight:400}.brand-mark{display:grid;place-items:center;width:39px;height:39px;border-radius:10px;color:#fff;background:var(--navy);font-size:25px;letter-spacing:-3px;padding-right:4px}.brand-mark span{color:var(--blue)}nav{display:flex;gap:32px;align-items:center;font-size:14px;font-weight:600}nav a:hover,.text-link:hover,.book-link:hover{color:#287ac1}.nav-contact{border:1px solid #d9dfe4;padding:12px 17px;border-radius:6px}.hero{padding-top:110px;padding-bottom:80px}.eyebrow,.kicker{font-size:12px;letter-spacing:2.1px;font-weight:800}.eyebrow{display:flex;align-items:center;gap:10px}.dot{width:9px;height:9px;background:#61a8f7;border-radius:50%}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(54px,7.2vw,102px);letter-spacing:-.075em;line-height:1.04;font-weight:750;margin:24px 0 30px}h1 em,.about h2 em{font-family:Georgia,serif;font-weight:400;letter-spacing:-.055em;color:#4476a8}.lead{font-size:clamp(18px,2vw,22px);line-height:1.6;color:#5a687c;max-width:650px}.hero-actions{display:flex;align-items:center;gap:33px;margin-top:36px}.button{display:inline-flex;align-items:center;justify-content:center;gap:30px;font-size:14px;font-weight:750;padding:19px 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#e4e8e7;border-radius:10px;overflow:hidden}.book-art{height:345px;display:flex;align-items:center;justify-content:center}.book-art.blue{background:#dceaf7}.book-art.green{background:#dfebe0}.cover{width:207px;height:282px;display:flex;flex-direction:column;justify-content:space-between;padding:21px;background:#142b49;color:white;transform:rotate(-6deg);box-shadow:15px 19px 22px #0003;border-left:9px solid #0a1b33}.green .cover{background:#254e46;border-left-color:#153c34;transform:rotate(6deg)}.cover-top,.cover-bottom{font-size:8px;letter-spacing:1.5px;font-weight:700}.cover strong{font-size:33px;line-height:1.07;letter-spacing:-1.5px}.cover-dot{color:#75b8f5}.green .cover-dot{color:#cceab9}.book-copy{padding:31px 34px 35px}.tag{font-size:11px;font-weight:800;letter-spacing:1.4px;color:#5782a8}h3{font-size:30px;letter-spacing:-1.3px;margin:14px 0}.book-copy p{font-size:15px;line-height:1.75;color:#6a7684;min-height:82px}.book-status{display:block;font-size:12px;color:#667481;background:#f2f5f6;padding:9px 12px;border-radius:4px;width:max-content;margin:18px 0 24px}.book-link{display:flex;justify-content:space-between;border-top:1px solid #e8ebed;padding-top:20px;font-size:14px;font-weight:800}.note{font-size:13px;color:#87919a;margin-top:28px}.about{display:grid;grid-template-columns:1fr 1fr;gap:70px;padding-top:120px;padding-bottom:140px}.about>div:last-child{padding-top:50px}.about p:not(.kicker){font-size:17px;color:#626f7b;line-height:1.8;margin-bottom:20px}.about .text-link{display:inline-block;margin-top:20px}.closing{background:var(--navy);color:white;padding:75px 0}.closing-inner{display:flex;align-items:center;justify-content:space-between;gap:25px}.closing h2{font-size:clamp(42px,5vw,65px)}.closing .kicker{color:#8bbbec}.light{background:#fff;color:var(--navy)}.footer{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-top:32px;padding-bottom:32px;color:#788391;font-size:12px}@media(max-width:760px){.site-header{height:75px}nav{gap:16px}nav .nav-contact{display:none}.hero{padding-top:75px;padding-bottom:50px}.hero-rule{margin-top:75px;gap:14px;flex-wrap:wrap}.section-top,.about{display:block}.section-intro{margin-top:22px}.book-grid{grid-template-columns:1fr}.books-section{padding:65px 0}.about{padding-top:75px;padding-bottom:80px}.about>div:last-child{padding-top:35px}.closing-inner{align-items:start;flex-direction:column}.footer{flex-wrap:wrap}.footer span:nth-child(2){display:none}}@media(max-width:450px){.container,.site-header{width:calc(100% - 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/* Temporary relaunch: stronger links and subtle visual continuity with the original learning site */
.amazon-button{display:flex;justify-content:space-between;align-items:center;background:var(--navy);color:#fff;padding:15px 17px;font-size:14px;font-weight:750;border-radius:5px;margin:0 0 17px;transition:background .2s,transform .2s}.amazon-button:hover{background:#315c85;transform:translateY(-2px)}.book-status{margin-bottom:16px}.book-copy .book-link{padding-top:16px}.book-card{box-shadow:0 12px 34px rgba(18,36,57,.04)}.hero{background:radial-gradient(ellipse at 90% 5%,#eaf4ff 0%,transparent 40%)}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}

/* Edition-specific book cover images (Amazon image delivery) */
.real-book-cover{height:285px;width:auto;max-width:85%;object-fit:contain;filter:drop-shadow(12px 17px 14px rgba(0,0,0,.22))}.book-art{padding:22px}.book-art img{display:block}@media(max-width:450px){.real-book-cover{height:255px}}