@font-face{font-family:WenKai;src:url(/read/ulab/wenkai-subset.woff2) format("woff2");font-display:swap;font-weight:400 700}:root{--reader-gold: #E2A21F;--reader-green: #3F6B5B;--reader-paper: #FBF6EA;--reader-ink: #2a241c;--reader-mute: #8a7f6c;--reader-rule: #e6dcc4;--reader-tint: #f3ead2}.reader-shell{min-height:100vh;background:var(--reader-paper);color:var(--reader-ink);font-family:var(--font-cn-sans)}.reader-shell.is-dark{--reader-paper: #1a1712;--reader-ink: #ece4d2;--reader-mute: #a89e88;--reader-rule: #3a3527;--reader-tint: #262115;--reader-green: #7fae9a}.reader-shell.is-dark img{filter:brightness(.9)}.reader-topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 20px;background:var(--reader-paper);border-bottom:1px solid var(--reader-rule)}.reader-topbar-left{display:flex;align-items:center;gap:14px;min-width:0}.reader-back{font-size:14px;color:var(--reader-mute);white-space:nowrap}.reader-back:hover{color:var(--reader-green)}.reader-doc-title{font-family:"WenKai",var(--font-cn-serif);font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reader-topbar-right{display:flex;align-items:center;gap:6px;flex-shrink:0}.reader-icon-btn,.reader-fontsize button{font-size:13px;padding:6px 10px;border-radius:6px;color:var(--reader-ink);background:transparent;white-space:nowrap}.reader-icon-btn:hover,.reader-fontsize button:hover{background:var(--reader-tint)}.reader-fontsize{display:flex;gap:2px}.reader-fontsize button.on{background:var(--reader-gold);color:#241c0a}.reader-progress{height:2px;background:var(--reader-rule);position:sticky;top:47px;z-index:39}.reader-progress>div{height:100%;background:var(--reader-gold);transition:width .1s linear}.reader-body{display:flex;align-items:flex-start;gap:32px;max-width:1120px;margin:0 auto;padding:24px 20px 40px}.reader-toc--desktop{position:sticky;top:70px;width:220px;flex-shrink:0;max-height:calc(100vh - 100px);overflow-y:auto}.reader-toc-list{display:flex;flex-direction:column}.reader-toc-list a{display:block;padding:5px 0;font-size:13px;color:var(--reader-mute);cursor:pointer;line-height:1.5}.reader-toc-list a.toc-l2{padding-left:14px;font-size:12px}.reader-toc-list a:hover{color:var(--reader-green)}.reader-toc-list a.active{color:var(--reader-gold);font-weight:600}.reader-content{flex:1;max-width:720px;line-height:1.9;font-size:var(--reader-fs, 18px)}.reader-loading{padding:80px 20px;text-align:center;color:var(--reader-mute)}.reader-loading--error{display:flex;flex-direction:column;align-items:center;gap:16px}.reader-loading--error p{margin:0;font-size:15px}body.is-reader-page .us-share-fab{display:none!important}.rb-cover{position:relative;border-radius:10px;overflow:hidden;margin-bottom:32px;color:#fff;min-height:320px;display:flex;align-items:flex-end}.rb-cover-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}.rb-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,#1418141a,#1418148c 55%,#141814e0)}.rb-cover-body{position:relative;z-index:1;padding:28px}.rb-cover-kicker{font-size:13px;letter-spacing:.3em;color:var(--reader-gold);margin-bottom:8px}.rb-cover-body h1{font-family:"WenKai",var(--font-cn-serif);font-size:30px;margin:0 0 8px;color:#fff}.rb-cover-en{font-size:13px;color:#fffc;margin-bottom:10px}.rb-cover-sub{font-size:14px;color:#ffffffe6;margin-bottom:14px}.rb-cover-meta{display:flex;flex-wrap:wrap;gap:14px;border-top:1px solid rgba(255,255,255,.3);padding-top:10px;font-size:12px;color:#fffc}.rb-section{margin:40px 0 20px;padding-top:8px}.rb-section h2{font-family:"WenKai",var(--font-cn-serif);font-size:26px;color:var(--reader-ink)}.rb-section-en{font-size:13px;color:var(--reader-mute);margin-top:4px}.rb-module{margin:48px 0 24px;padding-top:16px;border-top:2px solid var(--reader-gold)}.rb-module-num{font-size:48px;font-weight:200;color:var(--reader-gold);line-height:1;font-family:var(--font-en-serif)}.rb-module h2{font-family:"WenKai",var(--font-cn-serif);font-size:28px;margin-top:6px}.rb-module-en{font-size:12px;letter-spacing:.2em;color:var(--reader-mute);margin:4px 0 12px}.rb-module-intro{color:var(--reader-mute);margin-bottom:14px}.rb-h2-wrap{margin:32px 0 8px}.rb-h2{font-family:"WenKai",var(--font-cn-serif);font-size:21px;display:flex;align-items:center;gap:8px}.rb-h2:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--reader-gold);flex:none}.rb-h2-en{font-size:12px;color:var(--reader-mute);font-weight:400}.rb-h3{font-size:17px;margin:20px 0 8px;color:var(--reader-green)}.rb-p{margin:12px 0}.rb-lead{font-size:19px;border-left:3px solid var(--reader-gold);padding-left:14px;margin:16px 0;color:var(--reader-ink)}.rb-figure{margin:20px auto;text-align:center}.rb-figure img,img.rb-img{border-radius:6px;cursor:zoom-in;max-width:100%;margin:0 auto}.rb-figure figcaption{font-size:13px;color:var(--reader-mute);margin-top:8px}.rb-list{margin:12px 0;padding-left:22px}.rb-list li{margin-bottom:6px}.rb-callout{background:var(--reader-tint);border-left:3px solid var(--reader-gold);padding:14px 18px;border-radius:0 8px 8px 0;margin:18px 0}.rb-callout-title{font-family:"WenKai",var(--font-cn-serif);color:var(--reader-green);margin-bottom:6px}.rb-quote{font-family:"WenKai",var(--font-cn-serif);font-size:20px;color:var(--reader-green);border-left:2px solid var(--reader-gold);padding-left:16px;margin:24px 16px;line-height:1.8}.rb-sign{text-align:right;color:var(--reader-mute)}.rb-sign-by{color:var(--reader-mute)}.rb-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin:18px 0}.rb-card{border:1px solid var(--reader-rule);border-top:3px solid var(--reader-gold);border-radius:6px;padding:14px 16px;background:transparent}.rb-card-tag{font-size:12px;color:var(--reader-gold);margin-bottom:4px}.rb-card-title{font-family:"WenKai",var(--font-cn-serif);font-size:16px;margin-bottom:6px}.rb-card p{font-size:14px;color:var(--reader-mute)}.rb-refs ul{padding-left:0;list-style:none}.rb-refs li{font-size:14px;color:var(--reader-mute);padding-left:18px;text-indent:-18px;margin-bottom:8px}.rb-refs-note{font-size:13px;color:var(--reader-mute);margin-top:8px}.rb-journal{background:var(--reader-tint);border-radius:8px;padding:20px;margin:24px 0}.rb-journal-head{margin-bottom:14px}.rb-journal-title{font-family:"WenKai",var(--font-cn-serif);font-size:18px;color:var(--reader-green)}.rb-journal-q{margin-bottom:16px}.rb-journal-qt{font-weight:600;margin-bottom:6px}.rb-journal-q textarea{width:100%;border:1px solid var(--reader-rule);border-radius:6px;padding:10px 12px;font-family:inherit;font-size:15px;background:var(--reader-paper);color:var(--reader-ink);resize:vertical;min-height:60px}.rb-journal-saved{display:inline-block;margin-top:4px;font-size:12px;color:var(--reader-green)}.rb-tools{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.rb-chip{border:1px solid var(--reader-gold);border-radius:20px;padding:4px 14px;font-size:13px}.rb-qa-item{margin-bottom:14px}.rb-qa-q{font-weight:600;color:var(--reader-green);margin-bottom:4px}.rb-steps{padding-left:20px;margin:16px 0}.rb-steps li{margin-bottom:14px}.rb-steps-title{font-weight:600}.rb-dl{display:grid;grid-template-columns:max-content 1fr;gap:6px 16px;margin:14px 0}.rb-dl dt{color:var(--reader-mute);font-size:13px;white-space:nowrap}.rb-dl dd{margin:0}.rb-principle{margin:20px 0;padding-top:14px;border-top:1px solid var(--reader-rule)}.rb-principle-n{font-size:12px;color:var(--reader-gold);letter-spacing:.1em}.rb-principle-title{font-family:"WenKai",var(--font-cn-serif);font-size:18px;margin:4px 0 8px}.rb-closing{margin:24px 0;font-family:"WenKai",var(--font-cn-serif);font-size:17px}.rb-stats{display:flex;flex-wrap:wrap;gap:24px;margin:18px 0}.rb-stat{text-align:center}.rb-stat strong{display:block;font-size:28px;color:var(--reader-gold);font-family:var(--font-en-serif)}.rb-stat span{font-size:12px;color:var(--reader-mute)}.rb-timeline{border-left:2px solid var(--reader-rule);padding-left:18px;margin:18px 0}.rb-timeline-item{margin-bottom:16px}.rb-timeline-date{font-size:12px;color:var(--reader-gold)}.rb-timeline-title{font-weight:600}.rb-table-wrap{overflow-x:auto;margin:18px 0}.rb-table{border-collapse:collapse;width:100%;font-size:14px}.rb-table th,.rb-table td{border:1px solid var(--reader-rule);padding:8px 10px;text-align:left}.rb-table th{background:var(--reader-tint)}.rb-team-group{margin-bottom:14px}.rb-team-g{font-weight:600;color:var(--reader-green);margin-bottom:4px}.rb-team-people span{display:inline-block;margin:2px 10px 2px 0;font-size:14px}.rb-schedule-item{margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--reader-rule)}.rb-schedule-head{margin-bottom:8px}.rb-schedule-date{float:right;font-size:12px;color:var(--reader-mute)}.rb-grading-group{margin-bottom:14px}.rb-grading-row{display:flex;justify-content:space-between;font-size:14px;padding:3px 0}.reader-lightbox{position:fixed;inset:0;background:#000000d9;z-index:100;display:flex;align-items:center;justify-content:center;cursor:zoom-out}.reader-lightbox img{max-width:92%;max-height:92%;border-radius:6px}.reader-toc-drawer{position:fixed;inset:0;background:#0006;z-index:90;display:flex;align-items:flex-end}.reader-toc-drawer-panel{background:var(--reader-paper);width:100%;max-height:70vh;overflow-y:auto;border-radius:16px 16px 0 0;padding:16px 20px}.reader-toc-drawer-head{display:flex;justify-content:space-between;align-items:center;font-weight:600;margin-bottom:10px}.reader-toc-drawer-head button{font-size:22px;line-height:1}.reader-journal-export{display:flex;align-items:center;gap:12px;max-width:720px;margin:0 auto 30px;padding:0 20px;font-size:13px;color:var(--reader-mute)}.reader-footer-nav{display:flex;justify-content:space-between;max-width:1120px;margin:0 auto;padding:20px;border-top:1px solid var(--reader-rule)}@media(max-width:1023px){.reader-toc--desktop{display:none}.reader-doc-title{max-width:140px}}@media(min-width:1024px){.reader-toc-btn{display:none}}@media(max-width:640px){.reader-icon-btn,.reader-fontsize button{padding:6px 8px;font-size:12px}.rb-cover-body h1{font-size:24px}}.pdf-body{align-items:flex-start}.pdf-thumbs{display:flex;flex-direction:column;gap:10px}.pdf-thumb{display:flex;flex-direction:column;align-items:center;gap:4px;border:2px solid var(--reader-rule);border-radius:6px;padding:6px;text-align:center;font-size:12px;background:transparent;cursor:pointer}.pdf-thumb.on{border-color:var(--reader-gold);color:var(--reader-gold);font-weight:600}.pdf-thumb-canvas{display:block;width:100%;max-width:120px;height:auto;min-height:60px;background:#fff;box-shadow:0 1px 4px #0000001f}.pdf-thumb-num{font-size:12px;color:var(--reader-mute)}.pdf-thumb.on .pdf-thumb-num{color:var(--reader-gold)}.pdf-thumbs--drawer{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.pdf-pages{flex:1;display:flex;flex-direction:column;align-items:center;gap:20px;touch-action:pan-x pan-y pinch-zoom}.pdf-page-wrap{min-height:300px;box-shadow:var(--sh-md, 0 4px 16px rgba(0,0,0,.1))}.pdf-page-wrap 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24px;--sp-6: 32px;--sp-7: 48px;--sp-8: 64px;--sp-9: 96px;--sp-10: 128px;--r-sm: 2px;--r-md: 6px;--r-lg: 12px;--r-xl: 20px;--r-pill: 999px;--sh-sm: 0 1px 2px rgba(13, 20, 25, .06);--sh-md: 0 4px 16px -4px rgba(13, 20, 25, .08), 0 2px 4px rgba(13, 20, 25, .04);--sh-lg: 0 16px 40px -12px rgba(13, 20, 25, .18), 0 4px 8px rgba(13, 20, 25, .06);--sh-glow: 0 0 60px -10px rgba(232, 181, 61, .4);--font-cn-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;--font-cn-sans: "Noto Sans SC", "PingFang SC", "Source Han Sans SC", sans-serif;--font-en-serif: "Cormorant Garamond", "EB Garamond", Georgia, serif;--font-en-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-display: "Cormorant Garamond", "Noto Serif SC", "Source Han Serif SC", serif;--font-mono: "JetBrains Mono", "SF Mono", Menlo, monospace;--w-prose: 680px;--w-content: 1080px;--w-wide: 1280px;--lh-tight: 1.15;--lh-snug: 1.35;--lh-base: 1.65;--lh-loose: 1.9}*{box-sizing:border-box}html,body{margin:0;padding:0}html{font-size:var(--fs-base);-webkit-font-smoothing:antialiased}body{font-family:var(--font-cn-sans);color:var(--ink-800);background:var(--paper);line-height:1.8;letter-spacing:0;font-feature-settings:"palt" 1;text-spacing-trim:trim-start;background-image:radial-gradient(circle at 15% 30%,rgba(184,115,51,.04) 0%,transparent 50%),radial-gradient(circle at 85% 70%,rgba(44,136,152,.03) 0%,transparent 50%)}:lang(zh),[lang=zh],[lang=zh] *{font-feature-settings:"palt" 1,"pkna" 1}h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:500;line-height:1.25;letter-spacing:0;margin:0;color:var(--ink-900);text-wrap:balance}h1:lang(zh),h2:lang(zh),h3:lang(zh),h4:lang(zh),h5:lang(zh),[lang=zh] h1,[lang=zh] h2,[lang=zh] h3,[lang=zh] h4,[lang=zh] h5{font-family:var(--font-cn-serif);letter-spacing:.02em;line-height:1.3;font-weight:500}p{margin:0;text-wrap:pretty;line-height:1.85}p:lang(zh),[lang=zh] 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50%,var(--ink-700) 90%,transparent 100%);opacity:.4}.brush-line-gold{height:2px;background:linear-gradient(to right,transparent 0%,var(--gold-500) 20%,var(--gold-deep) 50%,var(--gold-500) 80%,transparent 100%);opacity:.7}.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 24px;border-radius:var(--r-pill);font-size:var(--fs-base);font-weight:500;letter-spacing:.02em;transition:all .2s ease;font-family:var(--font-cn-sans)}.btn-primary{background:var(--ink-900);color:var(--paper-white)}.btn-primary:hover{background:var(--cinnabar);transform:translateY(-1px);box-shadow:var(--sh-md)}.btn-ghost{background:transparent;color:var(--ink-800);box-shadow:inset 0 0 0 1px var(--ink-300)}.btn-ghost:hover{background:var(--ink-100);box-shadow:inset 0 0 0 1px var(--ink-500)}.btn-gold{background:var(--gold-500);color:var(--ink-900)}.btn-gold:hover{background:var(--gold-deep);color:var(--paper-white)}.btn .arrow{transition:transform .2s ease}.btn:hover 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