.book-page{--book-paper:#f8f4ed;--book-coral:#f18a60;color:var(--book-paper)}
.book-crumb{padding-top:30px;font-size:.88rem;color:#b7cbce}.book-crumb a{color:inherit}.book-crumb span{padding:0 .6rem}
.book-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:clamp(35px,7vw,110px);align-items:center;padding-top:58px;padding-bottom:78px}
.book-eyebrow{font-family:'IBM Plex Mono',monospace;color:#90dce3;font-size:.82rem;letter-spacing:.055em;text-transform:uppercase;line-height:1.7}
.book-hero h1{font-family:'Space Grotesk',sans-serif;font-size:clamp(3.3rem,6.5vw,6.2rem);line-height:1.05;letter-spacing:-.05em;margin:22px 0 28px;font-weight:600;overflow-wrap:normal}.book-page em{font-style:normal;color:var(--book-coral)}
.book-lead{font-size:clamp(1.2rem,2vw,1.5rem);line-height:1.5;max-width:560px}.book-desc{color:#b7cbce;line-height:1.8;max-width:560px}
.book-actions{display:flex;align-items:center;flex-wrap:wrap;gap:22px;margin:30px 0 16px}.book-download{display:inline-flex;align-items:center;justify-content:center;gap:20px;background:#f18a60;color:#152b30!important;padding:18px 24px;border:1px solid #f18a60;border-radius:5px;text-decoration:none;font-weight:700;line-height:1.5}.book-download:hover{background:#ffa57f}.book-download:focus-visible,.book-page a:focus-visible,.book-page summary:focus-visible,.book-promo a:focus-visible{outline:3px solid #90dce3;outline-offset:6px}.book-small{font-size:.85rem;color:#b7cbce;line-height:1.7}
.book-cover{margin:0;display:flex;justify-content:center;position:relative;padding:28px;background:#203339;border:1px solid #3e565a;border-radius:8px}.book-cover img{display:block;width:100%;max-width:330px;height:auto;box-shadow:15px 18px 0 #101d21,0 22px 48px #0005;border:1px solid #466066}
.book-facts{display:flex;flex-wrap:wrap;gap:16px 36px;border-top:1px solid #3e565a;border-bottom:1px solid #3e565a;padding-top:24px;padding-bottom:24px;color:#b7cbce}.book-facts strong{color:#f8f4ed;margin-right:5px}
.book-section{padding-top:76px;padding-bottom:76px}.book-section h2,.book-promo h2{font-family:'Space Grotesk',sans-serif;letter-spacing:-.025em;font-size:clamp(1.8rem,3vw,3rem);line-height:1.2;margin:15px 0 25px}.book-intro{max-width:730px;margin-bottom:36px}.book-intro>p:not(.book-eyebrow){color:#b7cbce;line-height:1.8}
.book-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.book-card{padding:28px;background:#1a292e;border:1px solid #3a4e53;border-radius:7px}.book-card h3{font-size:1.35rem;line-height:1.3;margin:10px 0 17px}.book-card p{font-size:1rem;line-height:1.8;color:#b7cbce;margin-bottom:0}
.book-toc{list-style:none;padding:0;margin:0;counter-reset:chap}.book-toc li{border-top:1px solid #3a4e53;padding:20px 0;display:grid;grid-template-columns:60px 1fr;gap:12px;align-items:baseline}.book-toc li::before{counter-increment:chap;content:counter(chap,decimal-leading-zero);font-family:'IBM Plex Mono',monospace;color:#f18a60;font-size:.9rem}.book-toc h3{font-size:1.15rem;margin:0 0 7px}.book-toc p{color:#b7cbce;font-size:.95rem;line-height:1.65;margin:0}
.book-split{display:grid;grid-template-columns:1fr 1fr;gap:70px}.book-note{padding:24px;border-left:3px solid #f18a60;background:#1a292e;line-height:1.8;color:#c9d7d8}.book-faq details{border-top:1px solid #3a4e53;padding:22px 0}.book-faq summary{cursor:pointer;font-weight:600;font-size:1.1rem;line-height:1.5}.book-faq p{color:#b7cbce;line-height:1.8}.book-ending{background:#203339;border-top:1px solid #3a4e53}.book-ending .wrap{padding-top:60px;padding-bottom:60px}.book-ending h2{font-size:2.4rem}
.book-promo{display:grid;grid-template-columns:110px minmax(0,1fr) auto;gap:32px;align-items:center;margin:50px 0 35px;padding:32px;background:#203339;border:1px solid #3e565a;border-radius:8px}.book-promo>img{display:block;width:110px;height:auto;box-shadow:7px 7px 0 #101d21}.book-promo h2{font-size:1.8rem;margin:5px 0 12px}.book-promo p{margin:0;line-height:1.7;color:#b7cbce}.book-promo .book-eyebrow{color:#90dce3}.book-promo a{white-space:normal}.book-promo.wrap{margin:50px auto}
@media(max-width:900px){.book-hero{gap:35px;grid-template-columns:1.1fr 1fr}.book-cover{padding:18px}.book-grid{grid-template-columns:1fr}.book-split{gap:35px}.book-promo{grid-template-columns:90px 1fr}.book-promo>img{width:90px}.book-promo>a{grid-column:2;justify-self:start}.book-toc li{grid-template-columns:40px 1fr}}
@media(max-width:650px){.book-hero{grid-template-columns:1fr;padding-top:32px;padding-bottom:44px}.book-hero h1{font-size:3.8rem}.book-cover{max-width:350px;width:100%;justify-self:center}.book-actions{gap:18px}.book-download{width:100%;padding:15px 18px}.book-section{padding-top:48px;padding-bottom:48px}.book-split{grid-template-columns:1fr;gap:20px}.book-facts{gap:10px 22px}.book-promo{gap:22px;padding:24px;grid-template-columns:70px 1fr}.book-promo>img{width:70px}.book-promo h2{font-size:1.35rem}.book-promo>a{grid-column:1/-1;justify-self:stretch}.book-ending h2{font-size:2rem}}