:root{--paper:#f6f4ef;--surface:#fffefb;--ink:#22384d;--muted:#6a7780;--accent:#147d7b;--accent-soft:#e8f1ed;--line:#dfE3de;--header:68px;--radius:12px;font-family:Inter,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;text-rendering:optimizeLegibility}
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.icon{width:17px;height:17px}.search-summary{font-size:13px;color:var(--muted);white-space:nowrap;margin:0}.chapter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px}.chapter-card{position:relative;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 19px;min-height:221px;transition:transform .2s,border-color .2s,box-shadow .2s}.chapter-card:hover{transform:translateY(-3px);border-color:#aac0b8;box-shadow:0 9px 24px #253e4410}.card-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}.category-label{font-size:12px;color:var(--accent);background:var(--accent-soft);padding:4px 8px;border-radius:4px;line-height:1.2}.chapter-number{font-size:13px;color:#98a19f;font-variant-numeric:tabular-nums}.chapter-card h3{font-size:19px;line-height:1.5;margin:0 0 10px;font-weight:640;letter-spacing:-.025em}.chapter-card h3 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h1{font-size:36px}.not-found{max-width:760px;margin:110px auto 140px;padding:0 24px}.not-found h1{font-size:38px;letter-spacing:-.03em;font-weight:620}.not-found>p:not(.eyebrow){font-size:16px;color:var(--muted);line-height:1.8}.not-found .button{margin-top:22px}.page-not-found .site-footer{padding-right:24px;padding-left:24px}
.page-reader{height:100vh;height:100dvh;overflow:hidden;display:flex;flex-direction:column;background:var(--surface)}.reader-site-header .header-inner{max-width:none;padding:0 28px}.reader-shell{display:flex;flex-direction:column;min-height:0;flex:1}.reader-top{padding:19px 28px 17px;background:var(--paper);border-bottom:1px solid var(--line);flex:none}.reader-title-row{display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:1800px;margin:0 auto}.reader-title-row>div{min-width:0}.reader-title-row h1{font-size:25px;line-height:1.4;letter-spacing:-.03em;font-weight:620;margin:6px 0 0}.lecture-link{flex:none;color:var(--accent);background:#fbfcf8;padding:9px 13px;font-size:13px}.lecture-link .icon{width:18px;height:18px}.reader-controls{display:flex;align-items:center;gap:12px;max-width:1800px;margin:14px auto 0;font-size:12px}.chapter-select-label{display:flex;align-items:center;gap:9px;color:var(--muted);min-width:0}.chapter-select-label select{max-width:min(45vw,440px);min-width:150px;color:var(--ink);font-size:13px;border:1px solid #dbe1da;border-radius:6px;background:var(--surface);padding:6px 30px 6px 9px}.chapter-position{color:#88938e;font-variant-numeric:tabular-nums;margin-left:1px}.chapter-pagination{display:flex;gap:5px;margin-left:auto}.chapter-pagination>a,.page-disabled{display:flex;align-items:center;gap:5px;padding:5px 9px;border-radius:5px}.chapter-pagination>a:hover{color:var(--accent);background:#e9efea}.chapter-pagination .icon{width:16px;height:16px}.page-disabled{color:#afb7b2}.reader-layout{display:grid;grid-template-columns:198px minmax(0,1fr);flex:1;min-height:0;max-width:1856px;margin:0 auto;width:100%}.reader-toc{min-height:0;overflow-y:auto;padding:24px 16px 24px 23px;border-right:1px solid var(--line);background:#fafaf6;scrollbar-width:thin;scrollbar-color:#d2dad3 transparent}.reader-toc>h2{font-size:12px;font-weight:650;letter-spacing:.05em;margin:0 0 23px;color:#7a8981}.toc-group-title{font-size:12px;color:var(--accent);font-weight:650;margin:22px 0 10px}.toc-group-title:first-child{margin-top:0}.toc-list{list-style:none;padding:0;margin:0}.toc-list li{margin:3px 0}.toc-list a{display:block;line-height:1.65;font-size:12px;color:#708079;border-left:2px solid transparent;padding:5px 8px 5px 10px;overflow-wrap:anywhere}.toc-list a:hover{color:var(--accent);background:#edf3ed}.toc-list a[aria-current=location]{border-left-color:var(--accent);color:var(--accent);background:#edf3ed}.toc-level-3 a{padding-left:19px;font-size:11px}.toc-level-4 a{padding-left:27px;font-size:11px}.toc-home{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--muted);margin-top:35px;padding-top:18px;border-top:1px solid var(--line)}.toc-home .icon{width:15px;height:15px}.toc-empty{font-size:12px;color:var(--muted);line-height:1.8}.reader-panels{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);min-height:0;min-width:0}.reader-pane{display:flex;flex-direction:column;min-height:0;min-width:0;position:relative;overflow:hidden;background:var(--surface)}.reader-pane+.reader-pane{border-left:1px solid var(--line)}.pane-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:15px 28px 13px;border-bottom:1px solid #edf0e9;flex:none;background:#fffefbf2}.pane-heading h2{font-size:13px;font-weight:600;color:var(--accent);margin:0;line-height:1.4}.pane-scroll-hint{font-size:10px;color:#9ba59e;letter-spacing:.05em}.reader-scroll{overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#ced8d0 transparent;flex:1;min-height:0;scroll-behavior:smooth;outline-offset:-4px!important;scroll-padding:26px}.reader-scroll::-webkit-scrollbar{width:7px;height:7px}.reader-scroll::-webkit-scrollbar-thumb{background:#ced8d0;border-radius:8px}.pane-content{padding:24px 30px 36px}.pane-end{display:flex;align-items:center;justify-content:center;gap:12px;color:#b1bab3;font-size:11px;letter-spacing:.08em;margin:20px 30px 45px}.pane-end span{width:35px;height:1px;background:#e5e9e2}.panel-top{position:absolute;bottom:16px;right:17px;z-index:5;background:#fffffff5;color:var(--accent);border:1px solid #d9e3db;border-radius:50%;width:37px;height:37px;display:grid;place-items:center;box-shadow:0 2px 8px #23384c09}.panel-top .icon{width:18px;height:18px}.single-column .reader-panels{display:block;overflow:hidden}.single-column .reader-pane{height:100%;max-width:1040px;margin:0 auto}.single-column .pane-content{max-width:900px;padding:36px 50px 60px;margin:auto}.single-column .pane-scroll-hint{display:none}.single-column .pane-heading{background:transparent}.reader-tabs,.mobile-toc{display:none}
.prose{font-size:15px;line-height:1.95;color:#314355;overflow-wrap:break-word}.prose>:first-child{margin-top:0}.prose h1,.prose h2,.prose h3,.prose h4{color:var(--ink);line-height:1.5;font-weight:650;letter-spacing:-.018em;scroll-margin-top:24px}.prose h1{font-size:28px;margin:38px 0 22px}.prose h2{font-size:22px;border-bottom:1px solid #e8ece5;padding-bottom:10px;margin:38px 0 19px}.prose h3{font-size:18px;margin:30px 0 14px}.prose h4{font-size:16px;margin:25px 0 12px}.prose p{margin:16px 0}.prose strong{font-weight:650;color:#263f50}.prose a{color:var(--accent);text-decoration:underline;text-decoration-color:#96b9aa;text-underline-offset:3px}.prose a:hover{text-decoration-color:var(--accent)}.prose ul,.prose ol{padding-left:25px;margin:17px 0}.prose li{padding-left:3px;margin:8px 0}.prose li>p{margin:7px 0}.prose blockquote{border-left:3px solid #91b6a3;background:#f0f5ee;margin:22px 0;padding:6px 18px;color:#536d63;border-radius:0 6px 6px 0}.prose blockquote p{margin:10px 0}.prose hr{border:0;border-top:1px solid var(--line);margin:33px 0}.prose pre{background:#f0f2ed;border:1px solid #e6e9e1;padding:17px;border-radius:7px;overflow-x:auto;font-size:12px;line-height:1.7;max-width:100%}.prose code{font-family:Consolas,"SFMono-Regular",monospace;font-size:.87em;background:#f0f2ed;padding:2px 5px;border-radius:3px;color:#365b58}.prose pre code{padding:0;border:0}.prose table{display:block;width:max-content;max-width:100%;overflow-x:auto;border-collapse:collapse;margin:24px 0;font-size:13px;line-height:1.65}.prose th,.prose td{border:1px solid var(--line);padding:10px 13px;vertical-align:top;min-width:70px}.prose th{background:#edf2e9;font-weight:600}.prose img{max-width:100%;height:auto;display:block;margin:18px auto;border-radius:3px;object-fit:contain}.prose img[data-zoom],.prose [data-zoom] img{cursor:zoom-in}.prose figure{margin:20px 0 30px}.prose figcaption{font-size:12px;color:var(--muted);line-height:1.6;text-align:center;margin:10px 0 0}.prose figure button,.prose button[data-zoom]{display:block;background:transparent;border:0;padding:0;width:100%;cursor:zoom-in}.prose .image-gallery,.prose .gallery{display:grid;grid-template-columns:minmax(0,1fr);gap:19px}.prose .image-gallery figure,.prose .gallery figure{margin:0}.prose .katex{font-size:1.06em}.prose .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:7px 2px 10px;margin:20px 0;scrollbar-width:thin;scrollbar-color:#c5d0c5 transparent}.prose .katex-display>.katex{white-space:nowrap;text-align:center}.prose .katex-display .katex-html{padding:0 4px}.prose .katex-error{color:#a74635}.prose .callout{padding:14px 18px;border-left:3px solid #8cafa1;background:#eef4ec;border-radius:0 6px 6px 0}.prose .callout-title{font-weight:650;color:var(--accent)}.prose .footnotes{font-size:12px;color:var(--muted)}.content-empty{color:var(--muted);font-style:italic}
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@media(min-width:1700px){.reader-layout{grid-template-columns:220px minmax(0,1fr)}.pane-content{padding:30px 42px 45px}.prose{font-size:16px}.reader-toc{padding-left:27px}.toc-list a{font-size:13px}}
@media(max-width:1100px){.header-inner{padding:0 28px;gap:22px}.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.site-footer{margin:0 24px}.reader-layout{grid-template-columns:165px minmax(0,1fr)}.reader-toc{padding:22px 9px 22px 15px}.pane-content{padding:22px 22px 32px}.pane-heading{padding:14px 22px}.prose{font-size:14px}.prose h2{font-size:21px}.prose h3{font-size:17px}.reader-title-row h1{font-size:23px}.single-column .pane-content{padding:30px 35px}}
@media(max-width:860px){:root{--header:59px}.header-inner,.reader-site-header .header-inner{padding:0 20px;gap:20px}.site-brand{font-size:16px;gap:7px}.brand-mark{width:27px}.brand-mark .icon{width:25px}.top-nav{gap:18px;font-size:12px}.header-search span{display:none}.header-search .icon{width:19px}.library-main{padding-right:22px;padding-left:22px}.home-intro{padding:45px 0 38px;gap:22px}.home-intro h1{font-size:33px}.intro-description{font-size:15px}.library-counts{gap:20px;padding-left:20px}.library-counts strong{font-size:26px}.category-section{padding:28px 0 33px}.section-heading p{font-size:12px}.reader-top{padding:13px 19px 0}.reader-title-row{align-items:flex-start;gap:13px}.reader-title-row h1{font-size:21px;line-height:1.45;margin-top:5px}.reader-title-row .breadcrumbs{font-size:11px}.lecture-link{font-size:12px;padding:8px 10px;gap:5px;margin-top:5px}.lecture-link .icon{width:16px}.reader-controls{margin:12px 0 10px;gap:9px}.chapter-select-label>span{display:none}.chapter-select-label select{font-size:12px;max-width:50vw;min-width:120px}.chapter-position{font-size:11px}.chapter-pagination>a,.page-disabled{padding:5px 6px;gap:3px}.reader-layout{display:block;min-height:0}.reader-toc{display:none}.reader-panels{display:block;height:100%}.reader-pane{height:100%;border:0!important}.reader-pane+.reader-pane{border:0}.has-right[data-active-pane=left] .pane-right,.has-right[data-active-pane=right] .pane-left{display:none}.reader-tabs{display:flex;gap:26px;margin:0;padding:0;position:relative}.reader-tabs button{border:0;border-bottom:2px solid transparent;background:none;padding:11px 2px 10px;font-size:13px;color:var(--muted)}.reader-tabs button[aria-selected=true]{color:var(--accent);border-bottom-color:var(--accent);font-weight:650}.mobile-toc{display:block;position:relative;font-size:12px;margin-bottom:6px;z-index:8}.mobile-toc summary{display:inline-block;cursor:pointer;color:var(--muted);padding:4px 0}.mobile-toc summary:after{content:"⌄";margin-left:7px}.mobile-toc[open] summary:after{content:"⌃"}.mobile-toc nav{position:absolute;top:30px;left:0;right:0;max-height:min(48vh,370px);overflow:auto;padding:17px 20px;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 25px #22384d1b}.mobile-toc .toc-list a{font-size:13px}.pane-heading{padding:12px 24px}.pane-scroll-hint{display:none}.pane-content{padding:24px 27px 35px}.prose{font-size:15px}.prose h2{font-size:22px}.prose h3{font-size:18px}.single-column .reader-top{padding-bottom:6px}.single-column .pane-content{padding:27px 32px 42px}.single-column .pane-heading{display:none}.reader-scroll{scroll-padding:22px}.image-dialog .lightbox-stage{padding:19px 48px}.lightbox-toolbar{padding:12px 16px}.lightbox-hint{font-size:10px}.lightbox-nav{width:30px;height:42px}.lightbox-prev{left:9px}.lightbox-next{right:9px}}
@media(max-width:560px){.header-inner,.reader-site-header .header-inner{padding:0 16px;gap:14px}.site-brand{font-size:15px;letter-spacing:-.035em}.brand-mark{width:24px}.top-nav{gap:14px;max-width:32vw}.top-nav a:first-child{display:none}.header-search{margin-left:auto}.home-intro{display:block;padding:34px 0 31px}.eyebrow{font-size:11px;margin-bottom:13px}.home-intro h1{font-size:30px}.intro-description{font-size:14px;line-height:1.85}.library-counts{border:0;padding:0;margin-top:26px;gap:27px}.library-counts>span{display:flex;flex-direction:row;align-items:baseline;gap:8px;font-size:12px}.library-counts strong{font-size:23px}.library-main{padding:0 17px 44px}.section-heading h2{font-size:18px}.section-heading p{font-size:11px}.category-grid,.chapter-grid{grid-template-columns:minmax(0,1fr)}.category-card{padding:20px;gap:15px}.category-card h3{font-size:17px}.category-card p{font-size:13px}.category-arrow{right:20px;top:22px}.chapter-grid{gap:14px}.chapter-card{min-height:200px;padding:21px}.chapter-card h3{font-size:19px}.card-meta{margin-bottom:15px}.card-description{font-size:14px;margin-bottom:19px}.search-area{flex-direction:column;align-items:stretch;gap:11px}.search-summary{font-size:11px;margin:0 1px}.search-field{max-width:none;min-height:45px}.search-field input{font-size:13px}.site-footer{margin:0 18px;font-size:11px;padding:20px 0 25px}.category-main{padding-top:22px}.category-intro{padding:31px 0}.category-intro h1{font-size:30px}.reader-top{padding:11px 16px 0}.reader-title-row h1{font-size:19px}.reader-title-row .breadcrumbs{font-size:10px}.breadcrumbs ol{gap:5px}.breadcrumbs li{gap:5px}.lecture-link{font-size:11px;padding:7px 8px;gap:4px;white-space:nowrap}.lecture-link .icon{display:none}.chapter-select-label{flex:1}.chapter-select-label select{width:100%;max-width:calc(100vw - 185px);min-width:100px;padding-right:21px}.reader-controls{gap:7px}.chapter-pagination{gap:0}.chapter-pagination>a,.page-disabled{padding:5px 4px;font-size:11px}.chapter-pagination .icon{width:13px;height:13px}.chapter-position{display:none}.reader-tabs{gap:23px}.reader-tabs button{font-size:12px;padding-top:10px}.pane-heading{padding:11px 20px}.pane-heading h2{font-size:12px}.pane-content,.single-column .pane-content{padding:21px 20px 34px}.prose{font-size:14px;line-height:1.95}.prose h1{font-size:25px}.prose h2{font-size:20px}.prose h3{font-size:17px}.prose .katex{font-size:1.02em}.prose .katex-display{padding-bottom:12px;margin:20px 0}.prose ul,.prose ol{padding-left:20px}.lightbox-toolbar{gap:11px}.lightbox-toolbar p{font-size:12px}.lightbox-toolbar a span{display:none}.lightbox-toolbar>span{font-size:11px}.image-dialog .lightbox-stage{padding:16px 38px}.lightbox-prev{left:4px}.lightbox-next{right:4px}.lightbox-nav{width:28px;height:38px}.not-found{margin:75px auto 90px}.not-found h1{font-size:29px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{.site-header,.reader-top,.reader-toc,.pane-heading,.panel-top,.image-dialog,.pane-end,.site-footer,.mobile-toc{display:none!important}.page-reader{height:auto;overflow:visible;display:block}.reader-shell,.reader-layout,.reader-panels,.reader-pane,.reader-scroll{display:block!important;height:auto;overflow:visible}.reader-pane+.reader-pane{border:0!important;border-top:1px solid #aaa!important}.pane-content,.single-column .pane-content{padding:0;max-width:none}.prose .katex-display{overflow:visible}.prose img{max-height:90vh;break-inside:avoid}body{background:white}a{color:inherit}}