@charset "UTF-8";
:root{--ink:#182a23;--muted:#6f7b74;--line:#e4e8e2;--mint:#0d8060;--mint-light:#e9f4ec;--paper:#fafbf8;--white:#fff;--serif:"Iowan Old Style","Palatino Linotype","Songti SC","Noto Serif CJK SC",serif;--sans:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.6 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit;cursor:pointer}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{background:none;border:0}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--mint);outline-offset:4px;border-radius:3px}::selection{background:#cfe8d7}img{max-width:100%;height:auto}button:disabled{cursor:default}button[hidden],[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-80px;left:20px;z-index:100;background:var(--ink);color:white;padding:10px 18px}.skip-link:focus{top:15px}.page-width{max-width:1120px;margin-inline:auto;padding-inline:42px}
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12px;min-width:190px;text-align:left;font-size:12px;color:var(--muted);background:var(--white)}kbd{font:11px var(--sans);border:1px solid var(--line);border-radius:3px;padding:1px 4px;color:#939b95;margin-left:auto}.icon-button{width:34px;height:34px;display:grid;align-content:center;justify-content:center;font-size:25px;line-height:1}.menu-button{display:none;gap:6px}.menu-button span{display:block;background:var(--ink);width:18px;height:1px}.eyebrow{font:10px/1.5 var(--mono);letter-spacing:1.5px;font-weight:500;color:var(--muted);text-transform:uppercase}.status-dot{width:6px;height:6px;border-radius:50%;display:inline-block;background:#43a77d;margin:0 8px 1px 0}.home-intro{padding:69px 0 46px}.home-intro h1{font-size:68px;font-weight:540;letter-spacing:-3.4px;line-height:1.15;margin:17px 0 18px}.home-intro p{font-size:17px;color:var(--muted);max-width:680px;line-height:1.85;margin:0}.editorial-feature{display:grid;grid-template-columns:1.35fr 1fr;border:1px solid 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var(--mono);color:#74917c}.domain-rail{padding:28px 30px;background:#fdfefb;border-left:1px solid var(--line)}.rail-label{display:flex;align-items:center;justify-content:space-between;margin-bottom:19px}.rail-label>a{font-size:11px;color:var(--muted)}.rail-label a span{margin-left:8px}.rail-item{display:flex;gap:16px;align-items:center;padding:15px 0;border-top:1px solid var(--line)}.rail-item>span:first-child{font:10px var(--mono);color:#8d9c91}.rail-item strong{font-weight:500;font-size:13px;display:block}.rail-item small{font:9px/1.6 var(--mono);color:#8c9790;display:block;margin-top:3px;letter-spacing:.3px}.rail-arrow{margin-left:auto;color:#8b9d91}.rail-item:hover strong,.rail-item:hover .rail-arrow{color:var(--mint)}.essay-index{padding:66px 0 0}.index-title{display:flex;align-items:center;justify-content:space-between;padding-bottom:24px}.index-title h2{font-weight:550;font-size:21px;margin:0;letter-spacing:-.5px}.index-title h2 span{font:10px 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p{color:#909991;font-size:10px;margin:0}.site-footer>a:last-child{margin-left:auto;font-size:10px;color:var(--muted)}
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.reader-layout{display:grid;grid-template-columns:222px minmax(0,710px) 170px;gap:42px;max-width:1370px;margin:auto;padding:0 38px}.reader-sidebar{position:sticky;top:77px;height:calc(100dvh - 77px);overflow-y:auto;scrollbar-width:thin;padding:30px 14px 40px 0;border-right:1px solid var(--line)}.chapter-nav{font-size:12px}.nav-overview{font-size:11px;display:flex;justify-content:space-between;color:var(--muted);padding:4px 8px 22px 0}.chapter-nav section{padding-top:6px;margin-bottom:26px}.chapter-nav h3{font-size:12px;font-weight:550;margin:0 0 9px;line-height:1.8}.nav-number{font:9px var(--mono);color:#97a398;display:inline-block;min-width:24px}.chapter-nav ol{list-style:none;margin:0;padding:0}.chapter-nav li a{font-size:11px;color:#7c877f;line-height:1.7;display:block;padding:7px 10px 7px 24px;border-left:1px solid var(--line)}.chapter-nav li a:hover{color:var(--ink);background:#f1f4ed}.chapter-nav li a[aria-current]{color:var(--mint);border-left:2px solid var(--mint);padding-left:23px;background:#edf4ed}.reader-main{min-width:0;padding:45px 0 70px}.breadcrumb{display:flex;align-items:center;gap:12px;font-size:11px;color:var(--mint);margin-bottom:23px}.breadcrumb span{color:#bcc5bc}.article-header h1{font-size:36px;line-height:1.5;letter-spacing:-1.1px;font-weight:550;margin:0 0 18px;text-wrap:pretty}.article-subtitle{font-size:17px;color:var(--muted);line-height:1.85;margin:0 0 22px}.reader-meta{display:flex;align-items:center;gap:12px;color:#8d978e;font-size:10px;flex-wrap:wrap}.reader-meta button{margin-left:auto;display:flex;align-items:center;gap:4px;font-size:11px}.reader-meta button[aria-pressed=true]{color:var(--mint)}.article-deck{font-size:14px;line-height:1.95;color:#637367;margin:29px 0 0;border-left:2px solid #b9d9c3;padding-left:18px}.prerequisite-note{margin-top:28px;border:1px solid var(--line);background:#f4f7f0;padding:13px 16px;display:flex;gap:8px 16px;flex-wrap:wrap;font-size:11px}.prerequisite-note>span{color:var(--muted)}.prerequisite-note a{color:var(--mint)}.reader-tools{border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#8b988c;margin:32px 0 27px;padding-bottom:13px}.reader-tools button{display:flex;align-items:center;gap:7px;font-size:10px;color:var(--muted)}.toggle-track{width:23px;height:13px;border-radius:8px;background:#d8dfd7;padding:2px;display:block}.toggle-track:after{content:"";display:block;width:9px;height:9px;border-radius:50%;background:white;transition:transform .15s}.reader-tools button[aria-pressed=true] .toggle-track{background:var(--mint)}.reader-tools button[aria-pressed=true] .toggle-track:after{transform:translateX(10px)}.reader-toc{position:sticky;top:77px;padding-top:50px;max-height:calc(100dvh - 77px);overflow:auto;scrollbar-width:thin}.toc-heading{font-size:10px;font-weight:550;margin-bottom:17px}.toc{display:flex;flex-direction:column;gap:0;border-left:1px solid var(--line)}.toc a{font-size:10px;color:#8b968d;line-height:1.8;padding:6px 0 6px 13px;margin-left:-1px;border-left:1px solid transparent}.toc a.depth-3{padding-left:24px;font-size:10px}.toc a:hover,.toc a.active{color:var(--mint)}.toc a.active{border-color:var(--mint)}.toc-sources{font-size:10px;color:var(--muted);display:block;border-top:1px solid var(--line);padding-top:19px;margin-top:28px}.back-top{padding:0;margin-top:14px;font-size:10px;color:#9aa398}.reading-progress{position:fixed;top:76px;left:0;right:0;height:2px;z-index:25;pointer-events:none}.reading-progress span{display:block;width:0;height:100%;background:#3ea17b}
.prose{font-size:15px;line-height:2;color:#34483a;overflow-wrap:break-word}.prose>p{margin:0 0 21px}.prose h1,.prose h2,.prose h3,.prose h4{color:var(--ink);font-weight:550;position:relative;scroll-margin-top:105px;line-height:1.65}.prose h2{font-size:24px;letter-spacing:-.5px;margin:43px 0 18px}.prose h3{font-size:19px;margin:32px 0 13px}.prose h4{font-size:16px;margin:24px 0 10px}.prose>:first-child{margin-top:0}.heading-anchor{position:absolute;left:-19px;top:3px;font-size:14px!important;color:#bac9b9!important;border:0!important;opacity:0}.prose :is(h1,h2,h3,h4):hover .heading-anchor,.heading-anchor:focus-visible{opacity:1}.prose strong{font-weight:600;color:#223b2a}.prose ul,.prose ol{padding-left:23px;margin:15px 0 25px}.prose li{padding-left:4px;margin:7px 0}.prose li::marker{color:#94a98f}.prose li>p{margin:0}.prose a{color:var(--mint);border-bottom:1px solid #cee0d1}.prose a:hover{border-color:var(--mint)}.prose .citation{font:10px/1.6 var(--sans);background:#edf4ed;white-space:nowrap;border:0;border-radius:3px;padding:2px 4px;color:#3e7d58;vertical-align:1px}.citations-hidden .prose .citation{display:none}.prose hr{border:0;border-top:1px solid var(--line);margin:35px 0}.prose blockquote,.prose .callout,.prose .note,.prose .insight{margin:27px 0;border-left:2px solid #83b496;padding:16px 20px;background:#f0f5ed;font-size:13px;color:#5a715b}.prose blockquote p{margin:0}.prose code{font:12px/1.7 var(--mono);background:#eff2eb;padding:2px 5px;border-radius:3px;overflow-wrap:anywhere}.prose pre{background:#f0f3ed;border:1px solid var(--line);border-radius:5px;padding:20px 22px;overflow:auto;line-height:1.75;margin:25px 0;position:relative}.prose pre code{background:none;padding:0;overflow-wrap:normal}.copy-code{position:absolute;top:8px;right:8px;font:10px var(--sans);color:var(--muted);background:#f9faf6;border:1px solid var(--line);border-radius:3px;padding:3px 7px}.prose figure{margin:30px 0}.prose figure img,.prose p>img{display:block;width:auto;max-width:100%;margin:auto;border-radius:4px;border:1px solid var(--line);cursor:zoom-in}.prose figcaption{font-size:11px;color:var(--muted);line-height:1.8;text-align:center;margin:12px auto 0;max-width:90%}.table-scroll{overflow-x:auto;width:100%;margin:26px 0}.prose table{width:100%;border-collapse:collapse;font-size:12px;text-align:left;line-height:1.85}.prose th{background:#eef3eb;font-weight:550;color:#425f46}.prose td,.prose th{padding:12px 15px;border:1px solid var(--line);min-width:90px}.prose td{vertical-align:top}.prose .math-block{overflow:auto;margin:28px 0;padding:10px 2px}.prose .katex{font-size:1.05em}.prose .katex-display{margin:0}.prose .katex-error{color:#b44d3b!important}.prose :is(svg,canvas,iframe){max-width:100%}.prose .figure-title{font-size:14px;font-weight:600}.prose .diagram,.prose .architecture,.prose .flow{border:1px solid var(--line);padding:22px;background:#f5f7f1;border-radius:4px;overflow-x:auto}.article-ending{display:flex;gap:15px;align-items:center;justify-content:center;margin:50px 0 30px;opacity:.55}.article-ending>span{width:36px;height:1px;background:#bccbbb}.article-sources{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;font-size:12px}.article-sources summary{cursor:pointer;font-weight:500}.article-sources summary>span{font-size:10px;color:var(--muted);margin-left:10px;font-weight:400}.article-sources>a{display:flex;align-items:baseline;gap:16px;font-size:11px;line-height:1.8;margin:14px 0 0;color:#627966}.article-sources>a>span{font:9px var(--mono);color:var(--mint)}.article-links{margin:32px 0}.article-links h2{font-size:12px;font-weight:500;margin-bottom:16px}.article-links a{display:flex;justify-content:space-between;gap:25px;font-size:12px;padding:10px 0;color:var(--muted)}.article-links a:hover{color:var(--mint)}.chapter-pagination{margin-top:34px;padding-top:25px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:35px}.chapter-pagination a{display:flex;flex-direction:column;gap:8px}.chapter-pagination a:last-child{text-align:right}.chapter-pagination small{font-size:10px;color:var(--muted)}.chapter-pagination strong{font-size:13px;font-weight:500;line-height:1.8}.chapter-pagination a:hover strong{color:var(--mint)}
dialog{color:var(--ink);border:1px solid var(--line);padding:0;background:var(--paper)}dialog::backdrop{background:rgba(20,35,26,.27);backdrop-filter:blur(4px)}body:has(dialog[open]){overflow:hidden}.search-dialog{width:min(640px,calc(100% - 30px));max-height:min(660px,80dvh);margin:12dvh auto auto;border-radius:12px;box-shadow:0 24px 90px #16342522;overflow:hidden}.search-top{display:flex;align-items:center;padding:19px 20px;gap:14px;border-bottom:1px solid var(--line);background:white}.search-top svg{color:#819183;flex-shrink:0}.search-top input{border:0;outline:none;flex:1;min-width:0;font-size:14px;background:none}.search-top input:focus-visible{outline:none}.search-top input::placeholder{color:#a2aaa1}.dialog-close{font-size:10px;border:1px solid var(--line);border-radius:4px;color:var(--muted);padding:2px 6px}.search-results{overflow:auto;max-height:calc(min(660px,80dvh) - 113px);padding:8px}.search-empty{padding:30px 20px;color:var(--muted);text-align:center;font-size:12px}.search-result{display:block;padding:14px 15px;border-radius:5px;border:1px solid transparent;margin:3px 0}.search-result:hover,.search-result.selected{background:#edf4eb;border-color:#e1ecde}.search-result small{display:block;color:#77947a;font-size:10px;margin-bottom:6px}.search-result strong{font-size:14px;font-weight:500;display:block}.search-result p{font-size:11px;line-height:1.9;color:var(--muted);margin:7px 0 0}.search-result mark{background:#d8eccc;color:#35653d}.search-bottom{display:flex;justify-content:space-between;font-size:9px;color:#939d94;border-top:1px solid var(--line);padding:12px 19px;gap:10px}.navigation-drawer{position:fixed;left:auto;right:0;top:0;margin:0;width:min(360px,90vw);height:100dvh;max-height:none;max-width:none;padding:20px 24px;border:0;border-left:1px solid var(--line)}.drawer-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;font-size:12px;color:var(--muted)}.navigation-drawer .primary-nav{gap:25px;border-bottom:1px solid var(--line);margin-bottom:22px}.navigation-drawer .primary-nav a{padding:15px 0}.navigation-drawer .nav-overview{padding-top:8px}.navigation-drawer .chapter-nav li a{font-size:12px;padding-block:10px}.image-dialog{border:0;border-radius:0;max-width:96vw;max-height:96dvh;overflow:auto;background:transparent;margin:auto;text-align:center}.image-dialog::backdrop{background:rgba(15,24,19,.86);backdrop-filter:blur(8px)}.image-dialog img{display:block;max-width:92vw;max-height:82dvh;width:auto;object-fit:contain;background:white;margin:48px auto 0}.image-dialog p{color:#d3ded3;font-size:12px;max-width:800px}.zoom-close{position:fixed;right:25px;top:22px;color:white;font-size:12px;z-index:1}
@media(min-width:1600px){.reader-layout{gap:55px;max-width:1440px;grid-template-columns:240px minmax(0,760px) 180px}.reader-main{padding-top:55px}}
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