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var(--book-accent-dark)}.book-card{display:flex;flex-direction:column;gap:16px}.book-card .cover{transition:transform .2s ease,box-shadow .2s ease}.book-card:hover .cover,.book-card:focus-visible .cover{transform:translateY(-4px) rotate(-.6deg);box-shadow:0 2px 4px #0000002e,0 26px 44px -16px #00000080}.book-card-body{display:flex;flex-direction:column;gap:4px}.book-card-title{margin:0;font-size:1.15rem;font-weight:700}.book-card:hover .book-card-title{color:var(--accent)}.book-card-subtitle{color:var(--ink-3);font-size:.93rem}.book-card-meta,.book-status{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:4px;color:var(--ink-3);font-size:.85rem}.book-hero{display:flex;align-items:flex-start;gap:44px;margin-bottom:3.5rem}.book-hero-text{min-width:0;padding-top:8px}.book-hero-text h1{margin:0;font-size:clamp(2rem,1.5rem + 1.8vw,2.7rem);font-weight:800;letter-spacing:-.01em}.book-subtitle{margin:6px 0 0;color:var(--ink-3);font-size:1.2rem}.book-description{margin:18px 0 0;font-size:1.02rem;line-height:1.8}.book-status{margin-top:14px}.book-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}.book-contents h2{margin:0 0 12px;padding-bottom:10px;border-bottom:1px solid var(--line);font-size:1.3rem}.contents-list{margin:0;padding:0;list-style:none}.contents-item{padding:14px 0;border-bottom:1px solid var(--line)}.contents-link{display:grid;grid-template-columns:7rem 1fr;gap:12px;align-items:baseline}.contents-number{color:var(--ink-3);font-size:.9rem;font-variant-numeric:tabular-nums}.contents-title{color:var(--ink);font-size:1.08rem;font-weight:600}.contents-link:hover .contents-title{color:var(--accent)}.contents-description{margin:4px 0 0 calc(7rem + 12px);color:var(--ink-3);font-size:.92rem;line-height:1.6}@media(max-width:720px){.book-hero{flex-direction:column;align-items:center;gap:28px;text-align:center}.cover-hero{width:min(220px,60vw)}.book-status,.book-actions{justify-content:center}.contents-link{grid-template-columns:1fr;gap:2px}.contents-description{margin-left:0}}.gate{display:grid;flex:1;place-items:center;padding:48px 20px;background:radial-gradient(60% 50% at 50% 0%,color-mix(in srgb,var(--accent) 10%,transparent),transparent),var(--bg)}.gate-inner{display:flex;flex-direction:column;align-items:center;gap:28px;width:min(760px,100%)}.gate-inner>.brand-mark{width:56px;height:56px;color:var(--accent)}.gate-choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;width:100%;margin:0;padding:0;list-style:none}.gate-choice{display:flex;flex-direction:column;gap:8px;height:100%;padding:28px;border:1px solid var(--line);border-radius:14px;background:var(--bg);box-shadow:var(--shadow);transition:border-color .15s,transform .15s}.gate-choice:hover{border-color:var(--accent);transform:translateY(-2px)}.gate-title{color:var(--ink);font-size:1.4rem;font-weight:800}.gate-tagline{flex:1;color:var(--ink-3)}.gate-language{color:var(--accent);font-weight:700}.error-page{display:grid;flex:1;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));align-content:center;gap:32px;width:100%;max-width:60rem;margin:0 auto;padding:72px 24px}.error-block{text-align:center}.error-code{margin:0;color:var(--accent);font-size:3.5rem;font-weight:800;line-height:1}.error-block :is(h1,h2){margin:12px 0 8px;font-size:1.5rem}.error-block p:not(.error-code){margin:0 0 20px;color:var(--ink-3)}.search-dialog{width:min(720px,calc(100vw - 24px));max-height:84vh;margin:8vh auto 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var(--line)}.comments>h2{margin:0 0 1.2rem;font-size:1.125rem}.comments-mount{min-height:12rem}.comments-unavailable{margin:0;color:var(--ink-3);font-size:.875rem}@media print{.site-header,.sidebar,.sidebar-backdrop,.site-footer,.chapter-footer,.comments,.search-dialog,.copy-button,.heading-anchor,.skip-link{display:none!important}.book-layout{display:block}.content{padding:0}.content>*{max-width:none}.prose a{color:inherit;text-decoration:none}.prose pre,.callout,.formula-display,.prose img{break-inside:avoid}.js .callout.is-collapsed>.callout-content{display:block}}