.book-nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--c-surface) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--c-line)}.book-nav__in{display:flex;align-items:center;gap:var(--s-4);min-height:52px;overflow-x:auto;white-space:nowrap;font-size:.95rem}.book-nav__in a{text-decoration:none}.book-nav__in a:hover,.book-nav__in a:focus-visible{color:var(--c-accent)}.book-nav__title{margin-right:auto;font-weight:700}:where(#top,#about,#learn,#who,#endorsers,#resources,#author,#faq,#buy,#subscribe){scroll-margin-top:72px}.book-btn{display:inline-block;padding:.7rem 1.4rem;border:2px solid var(--c-accent);border-radius:999px;background:var(--c-accent);color:#fff;font-weight:700;line-height:1.2;text-decoration:none;transition:background .15s,color .15s}.book-btn:hover,.book-btn:focus-visible{background:#185a71;border-color:#185a71}.book-btn--ghost{background:transparent;color:var(--c-accent)}.book-btn--ghost:hover,.book-btn--ghost:focus-visible{background:var(--c-accent);color:#fff}.book-btn--light{background:#fff;border-color:#fff;color:var(--c-accent)}.book-nav .book-btn--sm{padding:.35rem 1rem;color:#fff;font-size:.9rem}.book-hero{padding-block:var(--s-8);background:url(/assets/topography.svg) center / 900px auto,linear-gradient(180deg,#e6f1f4 0%,var(--c-bg) 100%)}.book-hero__in{display:grid;grid-template-columns:minmax(220px,340px) minmax(0,1fr);gap:var(--s-8);align-items:center}.book-cover img,.book-cover__placeholder{display:block;width:100%;aspect-ratio:600 / 860;border-radius:3px 8px 8px 3px;box-shadow:0 24px 48px #10344240,inset 6px 0 #0000001f}.book-cover img{height:auto;object-fit:cover}.book-cover__placeholder{display:flex;flex-direction:column;justify-content:space-between;padding:var(--s-6) var(--s-5);background:linear-gradient(160deg,#1f6f8b,#12465a);color:#fff}.book-cover__title{font-size:clamp(2.4rem,5vw,3.4rem);font-weight:700;line-height:1.1;letter-spacing:.08em;writing-mode:vertical-rl}.book-cover__author{align-self:flex-end;font-size:1rem;opacity:.85}.book-pill{display:inline-block;margin:0;padding:.2rem .9rem;border-radius:999px;background:var(--c-surface);border:1px solid var(--c-line);color:var(--c-accent);font-size:.9rem;font-weight:700}.book-hero__title{margin:var(--s-3) 0 0;font-size:clamp(3rem,8vw,5.5rem);letter-spacing:.06em}.book-hero__subtitle{margin:var(--s-2) 0 0;font-size:1.3rem;color:var(--c-muted)}.book-hero__tagline{margin:var(--s-3) 0 0;font-size:clamp(1.3rem,2.6vw,1.8rem);color:var(--c-accent)}.book-hero__lead{margin:var(--s-4) 0 0;font-size:1.1rem}.book-buy{margin-top:var(--s-6)}.book-buy__head{margin:0 0 var(--s-3);font-size:1.1rem}.book-buy__note{margin:0 0 var(--s-3);color:var(--c-muted)}.book-buy__list{display:flex;flex-wrap:wrap;gap:var(--s-3);margin:0;padding:0;list-style:none}.book-facts{background:var(--c-surface);border-block:1px solid var(--c-line)}.book-facts__list{display:grid;grid-template-columns:repeat(4,1fr);margin-block:0;padding-block:var(--s-5);list-style:none;text-align:center}.book-facts__list strong{display:block;font-size:clamp(1.4rem,3vw,2rem);color:var(--c-accent)}.book-facts__list span{color:var(--c-muted);font-size:.95rem}.book-sect{padding-block:var(--s-8)}.book-sect--tint{background:#eaf3f5}.book-sect h2{margin:0 0 var(--s-5)}.book-kicker{margin:0 0 var(--s-2);color:var(--c-accent);font-weight:700;letter-spacing:.1em}.book-split{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:var(--s-7);align-items:start}.book-split p{font-size:1.08rem}.book-toc{display:grid;gap:var(--s-4);margin:0;padding:var(--s-5);list-style:none;background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-2)}.book-toc__label{margin:0;color:var(--c-muted);font-size:.85rem}.book-toc__title{margin:0;font-weight:700}.book-toc__chapters{margin:var(--s-1) 0 0;padding:0;list-style:none}.book-toc__chapters li{display:flex;gap:var(--s-3)}.book-toc__chapters span{min-width:3.2em;color:var(--c-accent);font-variant-numeric:tabular-nums}.book-checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,22rem),1fr));gap:var(--s-5) var(--s-6);margin:0;padding:0;list-style:none}.book-checks li{position:relative;padding-left:2.2rem}.book-checks li:before{content:"✓";position:absolute;left:0;top:.1rem;display:grid;place-items:center;width:1.5rem;height:1.5rem;border-radius:50%;background:var(--c-accent);color:#fff;font-size:.85rem}.book-checks h3{margin:0;font-size:1.15rem}.book-checks p{margin:var(--s-1) 0 0;color:var(--c-muted)}.book-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,17rem),1fr));gap:var(--s-4);margin:var(--s-5) 0 0;padding:0;list-style:none}.book-card{display:flex;flex-direction:column;gap:var(--s-2);padding:var(--s-5);background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-2)}.book-card h3,.book-card p,.book-card blockquote{margin:0}.book-card h3{font-size:1.15rem}.book-card__name{font-weight:700}.book-res__chapter{color:var(--c-accent);font-size:.85rem;font-weight:700}.book-card .book-res__actions{display:flex;flex-wrap:wrap;gap:var(--s-2);margin-top:auto;padding-top:var(--s-2)}.book-res__item p:not(.book-res__chapter,.book-res__actions){flex:1}.book-author{display:grid;grid-template-columns:minmax(160px,280px) minmax(0,1fr);gap:var(--s-7);align-items:center}.book-author img{width:100%;height:auto;aspect-ratio:1;object-fit:cover;border-radius:50%}.book-band{padding-block:var(--s-8);background:var(--c-accent);color:#fff}.book-band h2{max-width:28ch;margin-inline:auto;color:inherit;font-size:clamp(1.4rem,3vw,2rem)}.book-band p{margin-inline:auto;opacity:.85}.book-faq{max-width:820px}.book-faq details{border-bottom:1px solid var(--c-line)}.book-faq summary{display:flex;justify-content:space-between;gap:var(--s-4);padding-block:var(--s-4);font-size:1.1rem;font-weight:700;cursor:pointer;list-style:none}.book-faq summary::-webkit-details-marker{display:none}.book-faq summary:after{content:"+";color:var(--c-accent);font-size:1.4rem;line-height:1}.book-faq details[open] summary:after{content:"−"}.book-faq details p{margin:0 0 var(--s-4);color:var(--c-muted)}.book-meta{padding-bottom:128px;border-top:1px solid var(--c-line)}.book-meta__list{display:flex;flex-wrap:wrap;gap:var(--s-3) var(--s-6);margin-block:0;padding-block:var(--s-5);font-size:.95rem}.book-meta__list div{display:flex;gap:var(--s-2)}.book-meta__list dt{color:var(--c-muted)}.book-meta__list dd{margin:0}@media(max-width:767px){.book-nav__in>a:not(.book-nav__title):not(.book-btn){display:none}.book-hero{padding-block:var(--s-6)}.book-hero__in,.book-split,.book-author{grid-template-columns:1fr;gap:var(--s-6)}.book-cover{width:min(240px,70%);margin-inline:auto}.book-hero__copy{text-align:center}.book-buy__list{justify-content:center}.book-facts__list{grid-template-columns:repeat(2,1fr);row-gap:var(--s-4)}.book-sect,.book-band{padding-block:var(--s-7)}.book-author img{width:min(200px,60%);margin-inline:auto}}