.book{--paper:#fff;--ink:#222c34;--muted:#64737c;--line:#e2e8eb;--soft:#f5f8f9;--accent:#126c93;--green:#217763;--reading-size:19px;color-scheme:light;scroll-behavior:smooth;background:var(--paper);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}.book[data-theme=dark]{--paper:#182126;--ink:#e6ecef;--muted:#a8b8c1;--line:#3b4b53;--soft:#222e35;--accent:#80c8e5;--green:#88ccb3;color-scheme:dark}.book *{box-sizing:border-box}.book body{margin:0}.book a{color:var(--accent);text-underline-offset:3px}.book a:hover{text-decoration-thickness:2px}.book button,.book input{font:inherit}.book button,.book summary{cursor:pointer}.book button{color:inherit}.book button:disabled{opacity:.55;cursor:wait}.book :focus-visible{outline:3px solid var(--green);outline-offset:4px}.book [hidden]{display:none!important}.book .skip{position:fixed;top:-100px;left:16px;z-index:100;background:var(--paper);padding:12px}.book .skip:focus{top:8px}.book .topbar{height:94px;max-width:1440px;margin:auto;padding:18px 38px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:18px}.book .brand{display:flex;gap:12px;align-items:center;font-size:14px;line-height:1.25;color:var(--ink);text-decoration:none}.book .brand-mark{display:block;flex:none;width:38px;height:46px;color:var(--accent)}.book .brand-mark svg{display:block;width:100%;height:100%;overflow:visible}.book .topbar nav{display:flex;gap:24px;align-items:center;font-size:15px}.book .topbar nav a{text-decoration:none}.book .topbar button{background:none;border:0;padding:6px 0;color:var(--accent)}.book .layout{max-width:1380px;margin:0 auto;display:grid;grid-template-columns:240px minmax(0,1fr);gap:64px;padding:48px 32px 80px}.book .sidebar{position:sticky;top:25px;align-self:start;max-height:calc(100vh - 50px);overflow:auto;padding:0 22px 15px 0;scrollbar-width:thin}.book .sidebar-label,.book .eyebrow{font-size:13px;font-weight:600;letter-spacing:.065em;text-transform:uppercase;color:var(--muted);margin:0 0 17px}.book .book-nav ol{padding:0;list-style:none;margin:0}.book .book-nav li{margin:0 0 13px;line-height:1.45}.book .book-nav a{color:var(--ink);text-decoration:none}.book .book-nav a:hover{color:var(--accent);text-decoration:underline}.book .sidebar .book-nav{font-size:14px}.book .sidebar .book-nav>ol>li>a{font-weight:650}.book .sidebar .book-nav ol ol{margin:13px 0 22px;padding-left:12px;border-left:1px solid var(--line)}.book .sidebar a[aria-current]{color:var(--accent);font-weight:650}.book .main-column{min-width:0;max-width:900px}.book .home .layout{grid-template-columns:minmax(0,1fr);max-width:1110px;padding-top:54px}.book .home .sidebar{display:none}.book .home .main-column{max-width:none}.book .mobile-nav{display:none}.book .book-intro{display:grid;grid-template-columns:255px minmax(0,1fr);gap:56px;align-items:center;padding-bottom:66px}.book .cover{width:100%;height:auto;box-shadow:0 15px 32px #2437411b;border:1px solid var(--line)}.book h1{font-size:clamp(32px,3.3vw,48px);letter-spacing:-.035em;line-height:1.15;margin:0 0 28px;font-weight:730;overflow-wrap:break-word}.book .book-intro h1{font-size:clamp(38px,4vw,54px);margin-bottom:22px}.book .book-intro h1 span{color:var(--accent)}.book .subtitle{font-size:21px;line-height:1.5;margin:0 0 20px}.book .book-intro p:not(.eyebrow):not(.subtitle){font-size:16px;max-width:520px}.book .book-meta{color:var(--muted);font-size:14px!important}.book .intro-actions{display:flex;align-items:center;flex-wrap:wrap;gap:22px;margin-top:30px}.book .button{background:var(--accent);color:#fff;border:1px solid var(--accent);border-radius:5px;min-height:48px;padding:12px 20px;font-size:16px;font-weight:600;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:12px;line-height:1.35}.book[data-theme=dark] .button{color:#132129}.book .button.secondary{background:var(--paper);color:var(--accent)}.book .button span{font-size:13px;font-weight:400;opacity:.85;white-space:nowrap}.book .text-link{font-size:16px}.book .resume{display:inline-block;margin-top:22px}.book .contents{padding:48px 0 55px;border-top:1px solid var(--line)}.book h2{font-size:30px;line-height:1.25;letter-spacing:-.02em;margin:0 0 26px}.book .contents .book-nav>ol{column-count:2;column-gap:55px}.book .contents .book-nav>ol>li{break-inside:avoid;margin-bottom:24px}.book .contents .book-nav>ol>li>a{font-weight:650}.book .contents .book-nav ol ol{margin-top:14px;padding-left:17px;border-left:2px solid var(--line)}.book .contents .book-nav ol ol a{font-size:16px}.book .download{border-top:1px solid var(--line);padding:48px 0 0;scroll-margin-top:28px}.book .download>p{max-width:680px}.book .download-links{display:flex;gap:14px;flex-wrap:wrap;margin:25px 0 40px}.book .subscription{border-top:1px solid var(--line);padding-top:30px;max-width:720px}.book .subscription h3{font-size:23px;margin:0 0 10px}.book .subscription p{color:var(--muted)}.book label{display:block;margin:0 0 8px}.book input[type=email],.book input[type=search]{width:100%;border:1px solid #b8c5cc;border-radius:4px;background:var(--paper);color:var(--ink);padding:13px 14px;min-width:0}.book .email-row{display:flex;gap:10px}.book .consent{display:flex;gap:9px;font-size:14px;margin-top:17px;align-items:flex-start;line-height:1.55}.book .consent input{margin-top:5px;flex:none;width:16px;height:16px;accent-color:var(--accent)}.book .honey{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(100%)}.book .form-status{min-height:24px}.book .reading-controls{gap:8px;flex-wrap:wrap;margin:0 0 34px;color:var(--muted);font-size:14px}.book .reading-controls button,.book .copy-prompt{border:1px solid var(--line);border-radius:4px;background:var(--paper);padding:7px 11px}.book .reading-controls span{align-self:center}.book .book-text{font-size:var(--reading-size);line-height:1.67;max-width:760px;overflow-wrap:break-word}.book .book-text>h1{margin-bottom:42px}.book .book-text h2{font-size:1.5em;margin:2.2em 0 .9em;line-height:1.28;letter-spacing:-.025em}.book .book-text h3{font-size:1.13em;line-height:1.4;margin:1.9em 0 .65em}.book .book-text p{margin:0 0 1.05em}.book .book-text ul,.book .book-text ol{padding-left:1.35em;margin:1em 0 1.3em}.book .book-text li{margin:.4em 0}.book .book-text hr{border:0;margin:1.8em 0}.book .book-text blockquote{margin:1.5em 0;padding:0 0 0 22px;border-left:2px solid #91b8c9;font-size:.96em}.book .book-text blockquote.quote{font-weight:600}.book .book-text blockquote p:last-of-type{margin-bottom:0}.book .copy-prompt{display:block;margin-top:14px;color:var(--accent);font-size:14px}.book .part-label{font-size:14px!important;line-height:1.5!important;color:var(--green);margin-bottom:20px!important;font-weight:650;letter-spacing:.01em}.book figure{margin:2.2em 0}.book figure img{display:block;width:100%;height:auto;border:1px solid var(--line);background:white}.book figure .figure-link{display:block}.book figcaption{font-size:.82em;line-height:1.5;color:var(--muted);margin-top:12px}.book .enlarge{display:inline-block;font-size:14px;margin-top:8px}.book .table-scroll{overflow:auto;width:100%;margin:.5em 0 1.8em;overscroll-behavior-x:contain;border:1px solid var(--line)}.book table{border-collapse:collapse;min-width:100%;font-size:.82em;line-height:1.5}.book th,.book td{text-align:left;vertical-align:top;padding:11px 13px;border-bottom:1px solid var(--line);min-width:130px;max-width:360px}.book th{background:var(--soft);font-weight:650}.book td:empty{height:43px}.book .table-hint{font-size:13px!important;color:var(--muted);margin-bottom:8px!important}.book .page-turn{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:60px;padding-top:25px;border-top:1px solid var(--line);font-size:15px;max-width:760px}.book .page-turn a:last-child{text-align:right}.book [id]{scroll-margin-top:28px}.book .chapter-toc{max-width:760px;margin-top:42px;border-top:1px solid var(--line);padding-top:20px;font-size:15px}.book .chapter-toc ol{padding-left:20px}.book .chapter-toc li{margin:10px 0}.book .chapter-toc summary{color:var(--muted);font-weight:600}.book .footer{border-top:1px solid var(--line);display:flex;justify-content:center;gap:28px;flex-wrap:wrap;font-size:14px;color:var(--muted);padding:26px}.book dialog{width:min(760px,calc(100% - 28px));max-height:88vh;overflow:auto;border:1px solid var(--line);border-radius:8px;padding:28px;background:var(--paper);color:var(--ink)}.book dialog::backdrop{background:#18212680}.book .dialog-top{display:flex;justify-content:space-between;align-items:center;gap:15px}.book .dialog-top h2{font-size:25px;margin:0 0 15px}.book .dialog-close{border:0;background:var(--soft);padding:8px 12px;border-radius:4px}.book #search-status{font-size:14px;color:var(--muted)}.book #search-results{padding-left:20px}.book #search-results li{margin:22px 0}.book #search-results p{font-size:15px;margin:5px 0;color:var(--muted)}.book #search-results small{display:block;color:var(--green)}.book .js-only{display:none}.book.js .js-only{display:flex}.book .topbar .js-only{display:none}.book.js .topbar .js-only{display:block}@media(min-width:1600px){.book .layout{gap:90px}}@media(max-width:1100px){.book .layout{gap:35px;grid-template-columns:215px minmax(0,1fr);padding-left:24px;padding-right:24px}.book .book-intro{grid-template-columns:220px minmax(0,1fr);gap:38px}.book .home .layout{grid-template-columns:1fr}}@media(max-width:800px){.book .sidebar{display:none}.book .layout{display:block;padding:28px 24px 55px}.book .topbar{padding:15px 24px;height:85px}.book .topbar nav{gap:17px}.book .mobile-nav{display:block;margin-bottom:30px;padding:14px 0;border-bottom:1px solid var(--line);font-size:15px}.book .mobile-nav>.book-nav{padding:20px 0;max-height:60vh;overflow:auto}.book .mobile-nav ol ol{padding:12px 0 10px 16px}.book .home .mobile-nav{display:none}.book .home .layout{padding-top:32px}.book .book-intro{grid-template-columns:190px minmax(0,1fr);gap:27px}.book .book-intro h1{font-size:36px}.book .subtitle{font-size:18px}.book .contents .book-nav>ol{column-gap:30px}}@media(max-width:560px){.book{--reading-size:18px}.book .topbar{padding:14px 18px;height:80px;gap:10px}.book .brand{font-size:12px;gap:7px}.book .brand-mark{width:30px;height:37px}.book .topbar nav{gap:12px;font-size:13px}.book .layout{padding:18px 20px 44px}.book .home .layout{padding:25px 20px 44px}.book .book-intro{grid-template-columns:1fr;gap:30px;padding-bottom:40px}.book .cover{width:190px;justify-self:center}.book .book-intro h1{font-size:39px}.book .eyebrow{font-size:12px}.book .book-intro .eyebrow{font-size:13px}.book .intro-actions{gap:18px}.book .contents{padding:32px 0}.book h2{font-size:27px}.book .contents .book-nav>ol{column-count:1}.book .download{padding-top:32px}.book .download-links{flex-direction:column;align-items:stretch}.book .email-row{flex-direction:column}.book .email-row .button{align-self:flex-start}.book .reading-controls{margin-bottom:28px;font-size:13px}.book .reading-controls #reset-progress{font-size:12px}.book .book-text h1{font-size:32px}.book .book-text h2{font-size:1.35em}.book .book-text blockquote{padding-left:15px}.book .footer{justify-content:flex-start;padding:24px 20px;gap:14px}.book dialog{padding:20px}.book .page-turn{gap:20px;font-size:14px}}@media(prefers-reduced-motion:reduce){.book{scroll-behavior:auto}}@media print{.book .sidebar,.book .topbar,.book .reading-controls,.book .mobile-nav,.book .footer,.book .copy-prompt{display:none!important}.book .layout{display:block;padding:0}.book .book-text{font-size:11pt}.book .table-scroll{overflow:visible}.book figure{break-inside:avoid}}

.book .math-display{overflow-x:auto;margin:1.5em 0;padding:5px 0}.book math{font-size:1em}.book .math-display math{width:max-content;min-width:0}.book .math-inline{white-space:normal}.book .book-text a{overflow-wrap:anywhere}