:root{color-scheme:dark;--paper:#000;--ink:#fff;--line:#5d5d5d;--muted:#b3b3b3;--ui:Arial,Helvetica,sans-serif;--book:Georgia,'Times New Roman',serif;font-size:16px}
:root[data-theme=light]{color-scheme:light;--paper:#fff;--ink:#000;--line:#aaa;--muted:#555}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:48px}body{margin:0;background:var(--paper);color:var(--ink);font:1.125rem/1.7 var(--book);overflow-wrap:break-word}a{color:inherit;text-underline-offset:.22em;text-decoration-thickness:1px}a:hover{text-decoration-thickness:2px}button{font:inherit;color:inherit;cursor:pointer}button,a,summary{-webkit-tap-highlight-color:transparent}button{border:0;background:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid currentColor;outline-offset:5px}button:disabled{cursor:default}[hidden]{display:none!important}.muted{color:var(--muted)}
.skip-link{position:fixed;left:16px;top:12px;padding:10px 16px;background:var(--ink);color:var(--paper);z-index:100;transform:translateY(-160%);font:1rem var(--ui)}.skip-link:focus{transform:none}
.site-header{height:96px;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:space-between;padding:0 4.5%;gap:24px;font: .875rem var(--ui)}.brand{display:flex;align-items:center;min-height:44px;flex-shrink:0;text-decoration:none}.wordmark{font-size:.875rem;letter-spacing:.07em;font-weight:700}.logo{display:block;object-fit:contain}:root[data-theme=light] .logo{filter:invert(1)}.header-tools{display:flex;gap:26px;align-items:center}.header-tools>a,.header-tools>button{display:inline-flex;min-height:44px;align-items:center;justify-content:center;text-decoration:none}.header-tools>a:hover{text-decoration:underline}.languages{display:flex;gap:6px;align-items:center}.languages a{display:flex;min-width:32px;min-height:44px;align-items:center;justify-content:center;text-decoration:none;opacity:.55}.languages a[aria-current]{opacity:1;font-weight:700}.theme-button{min-width:44px;font-size:1.8rem;line-height:1}.menu-button{font:2rem/1 var(--ui);min-width:44px;min-height:44px;text-align:center;text-decoration:none}.floating-menu{position:fixed;right:16px;top:12px;display:flex;align-items:center;justify-content:center;background:var(--paper);border:1px solid var(--line);color:var(--ink);z-index:5}
main{max-width:780px;margin:0 auto;padding:80px 0 100px;min-height:60vh}main:focus{outline:0}h1,h2,h3,h4,h5{font-family:var(--ui);line-height:1.3;font-weight:500}h1{font-size:clamp(2rem,4vw,3.1rem);letter-spacing:-.035em;margin:0 0 24px;max-width:100%}.reader h1{font-weight:600;font-size:clamp(2rem,4.3vw,3.3rem);letter-spacing:.015em;margin-bottom:20px}.byline{font: .875rem/1.5 var(--ui);color:var(--muted);display:flex;gap:12px;margin:0 0 60px}p{margin:0 0 1.1em}.book-fold{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:0;margin-bottom:48px}.book-fold summary{padding:22px 0;display:flex;justify-content:space-between;align-items:center;gap:20px;cursor:pointer;list-style:none}.book-fold summary::-webkit-details-marker{display:none}.book-fold summary:after{content:'+';font:1.5rem var(--ui)}.book-fold[open] summary:after{content:'−'}.book-fold summary h2{display:inline;font-size:.875rem;letter-spacing:.1em;margin:0}.book-fold[open]{padding-bottom:20px}.book-fold p{margin-top:12px}.book-fold h3{font-size:1.2rem;margin:36px 0 20px}.code-heading{font-size:.875rem;letter-spacing:.13em;margin:0 0 56px;color:var(--muted)}.part{font-size:1.6rem;letter-spacing:.03em;margin:96px 0 32px;padding-top:36px;border-top:1px solid var(--line)}.code-heading+.part{margin-top:0;padding-top:0;border-top:0}.chapter{font-size:.875rem;letter-spacing:.065em;margin:50px 0 30px;color:var(--muted)}.part a,.chapter a,.principle a{text-decoration:none}.part a:hover,.chapter a:hover,.principle a:hover{text-decoration:underline}.principle{font-family:var(--book);font-size:1.35rem;line-height:1.45;font-weight:bold;margin:40px 0 17px}.reader p{font-size:1.1875rem;line-height:1.8}.reader .byline{font-size:.875rem;line-height:1.5}.afterword{margin-top:80px;margin-bottom:0}.book-fold summary:focus-visible{outline-offset:-3px}
.license h1,.download h1{margin-bottom:48px}.license h2,.download h2{font-size:1.45rem;margin:0 0 22px}.license h3,.download h3{font-size:1.05rem;margin:24px 0 14px}.license section,.download .permissions{margin-top:56px}.license-summary{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:28px 0 6px}.license-summary h2{font-size:.9375rem;font-weight:bold;margin:0 0 8px}.license-summary p{font-size:1.15rem;margin-bottom:24px}.summary-note{font: .875rem/1.65 var(--ui);margin-top:20px}.license blockquote{margin:20px 0;padding:20px 24px;border-left:2px solid var(--ink);font-size:1rem}.legal-code{border-top:1px solid var(--line);padding-top:36px;font-size:1rem}.legal-code pre{font:1rem/1.7 var(--book);white-space:pre-wrap;overflow-wrap:anywhere}.legal-code li{padding-left:6px;margin-bottom:14px}.legal-code ol{padding-left:24px}.legal-code h2{font-size:1.2rem;margin-top:42px}.legal-code h3{font-weight:600;margin-top:36px}.download-terms{font: .9375rem/1.7 var(--ui);border-left:2px solid var(--ink);padding-left:20px;margin:30px 0}.edition{border-top:1px solid var(--line);padding:28px 0;margin:0}.edition h3{font:1.2rem var(--ui);margin:0 0 12px}.edition-meta{font:.875rem/1.5 var(--ui);color:var(--muted);margin-bottom:24px}.download-links{display:grid;grid-template-columns:1fr 1fr;gap:16px}.download-link{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding:18px;border:1px solid var(--ink);font:.9375rem/1.4 var(--ui);text-decoration:none;min-height:62px}.download-link:hover{background:var(--ink);color:var(--paper)}.download-link.unavailable{border-color:var(--line);color:var(--muted);background:none}.download-link small{display:block;width:100%;font-size:.8125rem}.permissions p{margin-bottom:18px}.site-footer{padding:32px 4.5%;background:var(--ink);color:var(--paper);font:.875rem/1.65 var(--ui)}.site-footer p{margin:0}.copyright{display:flex;gap:8px;flex-wrap:wrap}.site-footer .scope{margin-top:12px;opacity:.75;font-size:.8125rem}.footer-contact{margin-top:10px!important}.site-footer .muted{color:inherit;opacity:.6}
.fallback-panels{max-width:780px;margin:0 auto 60px}.panel-content{padding:24px 0}.panel-content h2{font-size:1.5rem;margin:0 0 28px}.panel-content h3{font-size:1rem;margin-top:30px}.panel-content p{font-size:1rem}.panel-content dl{margin:0 0 32px}.panel-content dt{font:.8125rem var(--ui);color:var(--muted);margin:24px 0 6px}.panel-content dd{margin:0}.contents-list{font:.9375rem/1.5 var(--ui)}.contents-list>a{border-bottom:1px solid var(--line)}.contents-list a{position:relative;display:block;padding:12px 18px;text-decoration:none;min-height:44px}.contents-list a:hover{text-decoration:underline}.contents-list a[aria-current=location]{font-weight:700}.contents-list a[aria-current=location]:before{content:'●';position:absolute;left:1px;top:16px;font-size:.5rem}.contents-list details{border-bottom:1px solid var(--line)}.contents-list details details{border:0}.contents-list details div{padding:0 0 8px 12px}.contents-list summary{cursor:pointer;padding:16px 4px;min-height:44px;list-style-position:inside}.contents-list details details summary{font-size:.8125rem;line-height:1.6;color:var(--muted)}
dialog{background:var(--paper);color:var(--ink);border:1px solid var(--line);padding:50px 36px 28px;max-width:calc(100vw - 32px);max-height:calc(100dvh - 48px);width:590px;overscroll-behavior:contain}dialog::backdrop{background:rgb(0 0 0 / .72)}.navigation-dialog{margin:0 0 0 auto;height:100dvh;max-height:100dvh;max-width:100vw;width:580px;border-top:0;border-right:0;border-bottom:0}.close-dialog{position:absolute;top:10px;right:14px;min-height:44px;min-width:44px;font:2rem var(--ui)}.modal-open{overflow:hidden}dialog .panel-content{padding:0}dialog .edition{padding:24px 0}.panel-content .edition h3{margin:0 0 12px}.panel-content .download-terms{font-size:.875rem}dialog .download-link{font-size:.875rem;padding:14px}.fallback-panels:empty{display:none}
@media(min-width:1200px){main{max-width:760px}.floating-menu{right:3%;top:24px}}
@media(max-width:900px){main,.fallback-panels{margin-left:8%;margin-right:8%}.header-tools{gap:12px}.site-header{padding:0 5%}.wordmark{max-width:140px;line-height:1.35}}
@media(max-width:600px){.site-header{height:80px;padding:0 18px;gap:10px}.wordmark{font-size:.6875rem;max-width:84px}.header-tools{gap:4px;font-size:.8125rem}.header-tools .contacts-link{display:none}.languages{gap:0}.languages a{min-width:28px}.theme-button{min-width:36px;font-size:1.6rem}.menu-button{min-width:36px}.header-tools>a:not(.menu-button){padding:0 5px}.logo{width:34px;height:34px}main{margin:0;padding:54px 24px 64px}.reader h1{font-size:1.9rem;letter-spacing:0}.byline{margin-bottom:42px}.reader p{font-size:1.0625rem;line-height:1.8}.part{font-size:1.3rem;margin-top:72px}.chapter{font-size:.8125rem;line-height:1.6}.principle{font-size:1.2rem}.book-fold{margin-bottom:36px}.book-fold summary{padding:19px 0}.code-heading{margin-bottom:36px}.license h1,.download h1{font-size:2rem;line-height:1.2;margin-bottom:36px}.license h2,.download h2{font-size:1.25rem}.site-footer{padding:28px 24px;font-size:.8125rem}.copyright{column-gap:6px}.fallback-panels{margin:0 24px 48px}.floating-menu{right:10px;top:10px;min-height:40px;min-width:40px;opacity:.95}dialog{padding:60px 22px 24px;max-width:calc(100vw - 24px)}.navigation-dialog{max-width:100vw;width:100%}.download-links{gap:10px}.download-link{padding:14px 12px}.legal-code ol{padding-left:19px}}
@media(max-width:360px){.site-header{padding:0 10px}.header-tools{gap:0}.wordmark{max-width:68px;font-size:.625rem}main{padding-left:20px;padding-right:20px}.download-links{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{:root{--paper:#fff;--ink:#000;--line:#aaa;--muted:#555}body{font-size:11pt}.site-header,.floating-menu,.fallback-panels,dialog,.skip-link{display:none!important}main{max-width:none;margin:0;padding:0}.reader p{font-size:11pt;line-height:1.5}.part,.chapter,.principle{break-after:avoid}.site-footer{background:#fff;color:#000;padding:24px 0}.book-fold:not([open]){display:none}a{text-decoration:none}}
/* Keep the first principle within the opening reading view. */
main.reader{padding-top:64px}.reader .byline{margin-bottom:40px}.reader .book-fold:not(.afterword){margin-bottom:32px}.reader .code-heading{margin-bottom:36px}.reader .code-heading+.part{margin-bottom:24px}.reader .code-heading+.part+.chapter{margin-top:32px}.drawer-language{font: .875rem var(--ui);margin-bottom:24px}
@media(max-width:600px){main.reader{padding-top:48px}.reader .byline{margin-bottom:32px}}
html{scroll-behavior:auto}.header-tools>a{gap:6px}.download-link{flex-wrap:nowrap}.download-link>span:first-child{min-width:0}.download-link>span:last-child{flex-shrink:0}
@media(max-width:600px){main{padding-right:58px}.floating-menu{right:8px;min-width:40px;width:40px}.download-links{grid-template-columns:1fr}.download-link{padding:16px}}
.edition h2{font:1.2rem var(--ui);margin:0 0 12px}