.book-chapter-page main{max-width:1500px;margin:0 auto;padding:32px 24px 90px}.bc-top{display:flex;justify-content:space-between;gap:24px;padding:0 0 24px;border-bottom:1px solid var(--line)}.bc-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:48px;padding-top:32px}.bc-sidebar{position:sticky;top:90px;align-self:start;max-height:calc(100vh - 120px);overflow:auto;padding-right:12px}.bc-sidebar summary{cursor:pointer;padding:12px 0;font-weight:600}.bc-sidebar nav a,.bc-tools a{display:block;padding:8px 10px;line-height:1.6;text-decoration:none}.bc-sidebar nav a[aria-current]{border-left:2px solid var(--ink);background:var(--wash)}.bc-sidebar ol{padding-left:20px}.bc-sidebar ol li::marker{color:var(--muted)}.bc-current{border-top:1px solid var(--line);margin-top:16px}.bc-tools{display:grid;gap:12px;border-top:1px solid var(--line);padding-top:18px}.bc-tools label{display:flex;align-items:center;justify-content:space-between;gap:12px}.bc-tools select,.bc-tools button,.bc-search input,.bc-search button{font:inherit;color:inherit;background:var(--wash);border:1px solid var(--line);padding:9px 12px}.bc-heading{margin:0 0 32px}.bc-heading h1{font-size:clamp(26px,3vw,42px);line-height:1.45}.bc-language-note{padding:12px 16px;border-left:2px solid var(--ink);background:var(--wash);font-size:14px}.bc-reading{min-width:0}.bc-reading .book-reader-content{max-width:960px;margin:0 auto;font-size:18px;line-height:1.8}.bc-reading .book-reader-content p,.bc-reading .book-reader-content li{line-height:inherit}.bc-reading .book-reader-content table{display:block;max-width:100%;overflow-x:auto;font-size:15px;line-height:1.6}.bc-reading .book-reader-content img{max-width:100%;height:auto}.bc-reading .book-reader-content [id]{scroll-margin-top:110px}.bc-reading .book-reader-content h2,.bc-reading .book-reader-content h3{margin-top:2em}.bc-chapter-nav{display:flex;justify-content:space-between;gap:18px;border-top:1px solid var(--line);margin-top:48px;padding-top:24px}.bc-chapter-nav a{padding:10px}.bc-search{margin:48px 0 0 308px;max-width:960px;border-top:1px solid var(--line);padding-top:24px}.bc-search form>div{display:flex;gap:8px;margin-top:12px}.bc-search input{min-width:0;flex:1}.bc-search li{margin:20px 0}.bc-search li p{font-size:15px;line-height:1.7}.bc-mobile-nav{display:none}.book-toc-index{max-width:1160px;margin:32px auto;padding:0 24px}.book-toc-index details{border-top:1px solid var(--line);padding:14px 0}.book-toc-index summary{cursor:pointer;font-weight:600}.book-toc-index li{padding:8px}.book-tab-nav{display:flex;flex-wrap:wrap;gap:8px;margin:32px 0}.book-tab-nav a{font:inherit;padding:10px 18px;border:1px solid var(--line);background:transparent;color:inherit;cursor:pointer}.book-tab-nav a[aria-selected=true]{background:var(--ink);color:var(--paper,#fff)}.book-module [hidden]{display:none!important}.book-module .book-hero-actions{flex-wrap:wrap}.bc-source-title{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(max-width:900px){.book-chapter-page main{padding:20px 20px 100px}.bc-layout{display:block;padding-top:20px}.bc-sidebar{position:static;max-height:none;padding:0;margin:0 0 28px}.bc-sidebar .bc-current{display:none}.bc-tools{grid-template-columns:1fr 1fr;font-size:14px}.bc-reading .book-reader-content{width:100%;max-width:none}.bc-search{margin:40px 0 0}.bc-mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:1000;justify-content:space-between;align-items:center;padding:12px 18px calc(12px + env(safe-area-inset-bottom));background:var(--paper,#fff);border-top:1px solid var(--line);gap:8px}.bc-mobile-nav a,.bc-mobile-nav button{font:inherit;font-size:14px;color:inherit;border:0;background:transparent;text-decoration:none;padding:8px}.bc-chapter-nav{flex-wrap:wrap}.bc-top{font-size:14px;flex-wrap:wrap;gap:8px}.bc-sidebar details nav{max-height:55vh;overflow:auto}.site-page-tools{bottom:90px!important}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.book-tab-nav a{text-decoration:none;display:inline-block;min-height:44px}.books-cover img{width:100%;height:100%;object-fit:contain}.book-part summary{cursor:pointer;padding:12px 0}.book-part{border-bottom:1px solid var(--line)}.book-part li{padding:8px}.book-library-list .book-hero{border-bottom:1px solid var(--line);padding:36px 0}

/* The current outline has plain-text summaries, rather than the legacy three-column markup. */
.book-module .book-part>summary{display:block;position:relative;grid-template-columns:none;min-width:0;padding:16px 12px 16px 28px;line-height:1.6;overflow-wrap:anywhere;font-weight:600}
.book-module .book-part>summary::before{content:"";position:absolute;left:4px;top:calc(16px + .5em);width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(-45deg)}
.book-module .book-part[open]>summary::before{transform:rotate(45deg)}
.book-module .book-part>summary:focus-visible{outline:2px solid currentColor;outline-offset:3px}

/* Reading controls stay one tap away without occupying the beginning of every chapter. */
.bc-back-reader{display:inline-flex;align-items:center;min-height:44px;font-size:14px;color:var(--muted);margin-bottom:12px}
.bc-sidebar>[data-book-open-settings]{width:100%;margin-top:20px}
.book-chapter-page [data-book-open-settings],.bc-preferences button{font:inherit;color:inherit;background:var(--wash);border:1px solid var(--line);padding:10px 14px;min-height:44px;cursor:pointer;line-height:1.5}
.bc-preferences{color:var(--ink);background:var(--paper);border:1px solid var(--line);width:min(480px,calc(100% - 32px));max-height:80dvh;overflow:auto;margin:auto;padding:22px;overscroll-behavior:contain}
.bc-preferences::backdrop{background:rgb(0 0 0 / .5)}
.bc-preferences>header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.bc-preferences h2{font-size:22px;line-height:1.5}
.bc-preferences .bc-tools{display:grid;grid-template-columns:1fr}.bc-preferences select{min-height:44px;min-width:88px}
.bc-tools summary{padding:10px 0;cursor:pointer}.bc-local-note{font-size:13px;line-height:1.8;color:var(--muted)}
[data-book-bookmarks]>div{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line)}[data-book-bookmarks] a{flex:1;min-width:0;overflow-wrap:anywhere}
.bc-reader-status{min-height:1.8em;font-size:13px;line-height:1.8;color:var(--muted);margin-bottom:16px}.bc-heading{scroll-margin-top:100px}
.bc-end{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
.book-chapter-page [hidden]{display:none!important}
@media(max-width:900px){.bc-mobile-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;padding:6px 8px calc(6px + env(safe-area-inset-bottom))}.bc-mobile-nav a,.bc-mobile-nav button{font-size:12px;min-height:48px;text-align:center;display:flex;align-items:center;justify-content:center;line-height:1.5;padding:8px 4px}.book-chapter-page .site-page-tools{bottom:calc(82px + env(safe-area-inset-bottom))!important}.bc-top{overflow-wrap:anywhere}.bc-reading .book-reader-content{overflow-wrap:anywhere}.bc-heading h1{font-size:28px}}
@media print{.bc-mobile-nav,.bc-preferences,.bc-back-reader,.bc-reader-status{display:none!important}}
@media(max-width:900px){.book-chapter-page{--page-tools-bottom:calc(82px + env(safe-area-inset-bottom));--page-tools-size:36px;--page-tools-gap:6px}.book-chapter-page .bc-mobile-nav [data-book-open-settings]{font-size:12px;line-height:1.5;min-height:48px;border:0;padding:8px 4px;background:transparent}}

/* Wide source diagrams scroll inside the reading column, never the document. */
.bc-reading .book-reader-content figure.diagram{width:100%;max-width:100%;min-width:0;margin:2em 0}
.bc-reading .book-reader-content .diagram-render{width:100%;max-width:100%;min-width:0;overflow-x:auto;overscroll-behavior-x:contain}
.bc-reading .book-reader-content .diagram-render>svg{display:block;width:100%;min-width:960px;max-width:none;height:auto}
.bc-reading .book-reader-content figure.diagram figcaption{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:12px;font-size:14px;line-height:1.7}
.book-chapter-page [data-zoom-diagram],.bc-diagram-viewer button{font:inherit;color:inherit;background:var(--wash);border:1px solid var(--line);padding:10px 14px;min-height:44px;cursor:pointer}
.diagram-render:focus-visible,.bc-diagram-zoom:focus-visible{outline:2px solid var(--accent,currentColor);outline-offset:3px}
.bc-diagram-viewer{width:min(1200px,calc(100vw - 24px));max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px);margin:auto;padding:16px;color:var(--ink);background:var(--paper);border:1px solid var(--line);overflow:hidden}
.bc-diagram-viewer[open]{display:flex;flex-direction:column;gap:16px}
.bc-diagram-viewer::backdrop{background:rgb(0 0 0 / .6)}
.bc-diagram-viewer>header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex:none}
.bc-diagram-viewer h2{font-size:20px;line-height:1.5;overflow-wrap:anywhere}.bc-diagram-viewer button{flex:none}
.bc-diagram-zoom{width:100%;max-width:100%;min-width:0;min-height:0;max-height:calc(100dvh - 160px);overflow:auto;overscroll-behavior:contain}
.bc-diagram-zoom>svg{display:block;width:auto;min-width:0;max-width:none;height:auto}
@media print{.bc-diagram-viewer,[data-zoom-diagram]{display:none!important}.bc-reading .book-reader-content .diagram-render{overflow:visible}.bc-reading .book-reader-content .diagram-render>svg{width:100%;min-width:0;max-width:100%;height:auto}}