:root{color-scheme:light dark;--paper:#faf8f3;--ink:#292621;--muted:#746d63;--line:#ddd7cb;--wash:#eee9df;--accent:#9d3d33;--accent-wash:#f2dfd6;--blue:#3b5b6d;--blue-wash:#e3ebed;--white:#fffdfa;--serif:Georgia,'Iowan Old Style','Palatino Linotype','Songti SC','Noto Serif CJK SC',serif;--sans:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;--mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace;scroll-behavior:smooth;scroll-padding-top:28px}
@media(prefers-color-scheme:dark){:root{--paper:#211f1b;--ink:#ece5d9;--muted:#b6ad9e;--line:#484137;--wash:#2c2822;--accent:#e7a296;--accent-wash:#462d25;--blue:#a0becb;--blue-wash:#263940;--white:#27231e}}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer}button,a{touch-action:manipulation}a:hover{color:var(--accent)}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}button{border-radius:0}button:disabled{opacity:.45;cursor:default}h1,h2,h3,h4,p,figure{margin:0}h1,h2,h3{font-family:var(--serif);font-weight:400}img{max-width:100%;height:auto}::selection{background:var(--accent-wash)}[hidden]{display:none!important}.lang-zh{display:none}html[data-language=zh] .lang-en{display:none}html[data-language=zh] .lang-zh{display:revert}.site-width{width:min(1080px,calc(100% - 96px));margin-inline:auto}.site-main{min-height:65vh}.skip-link{position:absolute;left:20px;top:-100px;padding:10px 15px;background:var(--ink);color:var(--paper);z-index:20}.skip-link:focus{top:12px}.site-header{border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;gap:28px;min-height:88px}.wordmark{font:italic 32px/1 var(--serif);letter-spacing:-1.4px}.wordmark span{color:var(--accent)}.site-nav{display:flex;gap:29px;align-items:center;margin-left:auto;font-size:13px}.site-nav a{padding:7px 0;color:var(--muted)}.site-nav a[aria-current=page]{color:var(--accent);box-shadow:0 1px var(--accent)}.site-nav a:hover{color:var(--accent)}.language-switch{display:flex;gap:2px;border:1px solid var(--line);padding:3px}.language-switch button{border:0;background:transparent;color:var(--muted);font:11px/1.5 var(--mono);padding:6px 10px}.language-switch button[aria-pressed=true]{background:var(--ink);color:var(--paper)}.eyebrow{font:11px/1.7 var(--mono);letter-spacing:1.2px;text-transform:uppercase;color:var(--muted)}.accent-text{color:var(--accent)}.notebook-intro{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;padding:66px 0 41px;border-bottom:1px solid var(--line)}.notebook-intro h1{font-size:clamp(42px,4.8vw,64px);line-height:1.08;letter-spacing:-2px;margin:15px 0 22px;max-width:800px}.intro-copy{color:var(--muted);max-width:600px;font-size:15px}.intro-signature{font:italic 20px/1.4 var(--serif);color:var(--accent);white-space:nowrap;padding-bottom:4px}.featured-note{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.18fr);gap:56px;align-items:center;padding:43px 0 47px;border-bottom:1px solid var(--line)}.featured-copy h2{font-size:40px;line-height:1.15;letter-spacing:-1px;margin:14px 0 19px}.featured-summary{color:var(--muted);font-size:15px;margin-bottom:24px}.primary-link{display:inline-block;background:var(--ink);color:var(--paper);font-size:13px;padding:12px 18px;transition:background .2s}.primary-link:hover{background:var(--accent);color:var(--paper)}.note-meta{font:11px/1.7 var(--mono);color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:16px}.meta-dot{color:var(--line)}.featured-visual{min-width:0}.featured-visual .concept-demo{margin:0}.notes-section{padding:38px 0 12px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.section-heading h2{font-size:28px;line-height:1.3}.text-link,.text-button{color:var(--accent);font-size:12px}.text-link:hover,.text-button:hover{text-decoration:underline;text-underline-offset:5px}.text-button{background:transparent;border:0;padding:5px 0}.topic-filters{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0 27px}.topic-filters button{border:1px solid var(--line);padding:7px 12px;background:transparent;color:var(--muted);font-size:12px;border-radius:2px;transition:background .2s,color .2s}.topic-filters button[aria-pressed=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}.topic-filters button:hover{border-color:var(--muted)}.notes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 32px}.note-card{min-width:0}.note-cover-link{display:block}.note-cover{height:190px;background:var(--wash);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:24px;overflow:hidden;color:var(--ink)}.note-cover-link:hover .note-cover{border-color:var(--muted)}.note-card h3{font-size:26px;line-height:1.25;margin:9px 0 10px;letter-spacing:-.45px}.note-card h3 a{display:block}.note-summary{font-size:13px;color:var(--muted);line-height:1.8;max-width:460px}.cover-small{font:11px/1.5 var(--mono);letter-spacing:1px;color:var(--muted)}.cover-chain{display:flex;align-items:center;gap:0}.cover-circle{width:62px;height:62px;border:1.5px solid var(--ink);border-radius:50%;display:grid;place-items:center;font:31px/1 var(--serif);background:var(--white);transition:transform .3s}.cover-page{width:48px;height:59px;border:1.5px solid var(--ink);display:grid;place-items:center;font:30px/1 var(--serif);background:var(--white);border-radius:3px}.cover-connector{width:34px;height:1px;background:var(--ink)}.cover-accent{background:var(--accent-wash)!important;color:var(--accent)}.note-cover-link:hover .cover-circle{transform:translateY(-4px)}.cover-books{display:flex;gap:12px;align-items:center}.cover-books>span{width:44px;height:68px;border:1.5px solid var(--ink);border-radius:3px;background:var(--white);padding:15px 8px;transform:rotate(-8deg);transition:transform .3s}.cover-books>span:nth-child(2){height:80px;transform:rotate(3deg)}.cover-books>span:nth-child(3){height:59px;transform:rotate(9deg)}.cover-books i{display:block;height:1px;background:var(--ink);margin-bottom:9px}.note-cover-link:hover .cover-books>span{transform:rotate(0) translateY(-4px)}.cover-locks{display:flex;align-items:center}.cover-locks>span:not(.cover-bar){height:55px;width:55px;border:1.5px solid var(--ink);border-radius:3px;display:grid;place-items:center;font:25px/1 var(--serif);background:var(--white)}.cover-bar{width:25px;height:1px;background:var(--ink)}.cover-clock{display:flex;gap:25px;align-items:center;border-bottom:1.5px solid var(--ink);padding:8px 8px 19px;font:32px/1 var(--serif)}.cover-dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}.cover-schedule{display:flex;flex-direction:column;gap:15px}.cover-schedule>span{display:flex;align-items:center;gap:15px;font:22px/1 var(--serif)}.cover-schedule i{width:40px;height:20px;border:1px solid var(--ink);background:var(--white)}.cover-notebook{width:130px;border-left:2px solid var(--accent);padding:0 0 0 18px;transform:rotate(-3deg)}.cover-notebook span{display:block;width:100%;height:1px;background:var(--muted);margin:14px 0}.cover-notebook span:last-child{width:65%}.filter-result{margin:16px 0 0;font-size:12px;color:var(--muted);min-height:20px}.site-footer{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:58px;border-top:1px solid var(--line);padding:25px 0 34px;font-size:11px;color:var(--muted)}.footer-name{font-family:var(--serif);font-size:15px;color:var(--ink)}.footer-divider{padding:0 14px;color:var(--line)}.footer-links{display:flex;gap:22px;align-items:center}.concept-demo{margin:0 0 27px;background:var(--wash);border:1px solid var(--line);padding:26px;min-width:0}.demo-header{display:flex;gap:12px;justify-content:space-between;align-items:center;flex-wrap:wrap}.demo-switch{display:flex;gap:2px;padding:3px;background:var(--paper);border:1px solid var(--line)}.demo-switch button{border:0;background:none;color:var(--muted);font:11px/1.5 var(--mono);padding:6px 9px}.demo-switch button[aria-pressed=true]{background:var(--accent-wash);color:var(--accent)}.policy-flow,.logging-flow{display:grid;grid-template-columns:minmax(0,1fr) 23px minmax(0,1fr) 23px minmax(0,1fr);gap:6px;align-items:center;padding:32px 0 25px}.policy-node,.log-record{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:9px;background:var(--white);border:1.4px solid var(--ink);border-radius:24px;min-height:100px;padding:14px 4px;transition:background .35s,transform .35s,border-color .35s}.data-node{border-radius:3px}.node-symbol{font:35px/1 var(--serif);color:var(--accent)}.node-label{color:var(--muted);font-size:11px;text-align:center}.flow-arrow{color:var(--muted);font-size:20px;text-align:center}.policy-node.is-active,.log-record.is-active{background:var(--accent-wash);border-color:var(--accent);transform:translateY(-4px)}.policy-demo[data-mode=off] .target-node{background:var(--blue-wash);border-color:var(--blue)}.policy-demo[data-mode=off] .target-node .node-symbol{color:var(--blue)}.demo-caption{font-size:13px;color:var(--muted);min-height:48px;line-height:1.7}.demo-controls{display:flex;justify-content:space-between;gap:15px;align-items:center;border-top:1px solid var(--line);padding-top:13px;margin-top:13px}.demo-step-label{font:11px/1.5 var(--mono);color:var(--muted)}.demo-actions{display:flex;gap:20px}.demo-type{font:11px/1.6 var(--mono);color:var(--muted)}.log-record{border-radius:3px}.record-name{font:24px/1 var(--serif)}.post-header{max-width:820px;margin:0 0 0 auto;padding:42px 0 33px;border-bottom:1px solid var(--line)}.breadcrumb{display:inline-block;margin-bottom:24px}.post-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font:11px/1.7 var(--mono);color:var(--muted)}.post-header h1{font-size:clamp(36px,4vw,52px);line-height:1.12;letter-spacing:-1.5px;margin:19px 0}.post-deck{color:var(--muted);max-width:740px;font-size:15px;line-height:1.8}.post-byline{display:flex;align-items:center;gap:10px;margin-top:23px;font-size:12px;color:var(--muted)}.author-monogram{width:29px;height:29px;display:grid;place-items:center;border-radius:50%;background:var(--accent-wash);color:var(--accent);font:12px/1 var(--serif)}.reading-time{margin-left:auto;font:11px/1.5 var(--mono)}.post-layout{display:grid;grid-template-columns:190px minmax(0,820px);gap:70px;padding-top:30px}.contents-sidebar{position:sticky;top:25px;align-self:start;max-height:calc(100vh - 50px);overflow:auto}.contents-sidebar nav{display:flex;flex-direction:column;gap:11px;border-left:1px solid var(--line);padding-left:16px;margin-top:17px;font-size:12px;line-height:1.55}.contents-sidebar a{color:var(--muted)}.contents-sidebar a[aria-current=true]{color:var(--accent)}.contents-sidebar a[data-level='3']{padding-left:12px}.article-column{min-width:0}.takeaway{padding:16px 20px;background:var(--wash);border-left:2px solid var(--accent);margin:0 0 26px}.takeaway>.eyebrow{margin-bottom:6px}.takeaway>p:last-child{font-size:14px;line-height:1.85}.article-prose{font:17px/1.85 var(--serif);overflow-wrap:break-word}.article-prose p,.article-prose ul,.article-prose ol,.article-prose blockquote,.article-prose pre,.article-prose table{margin:0 0 24px}.article-prose h1,.article-prose h2{font-size:30px;line-height:1.3;letter-spacing:-.5px;margin:42px 0 18px;scroll-margin-top:30px}.article-prose h3{font-size:23px;line-height:1.4;margin:30px 0 15px;scroll-margin-top:30px}.article-prose h4{font:600 17px/1.5 var(--sans);margin:24px 0 14px}.article-prose li{margin:8px 0}.article-prose li>p{margin-bottom:12px}.article-prose blockquote{border-left:2px solid var(--line);padding:13px 20px;background:var(--wash);color:var(--muted);font-size:16px}.article-prose blockquote>p:last-child{margin-bottom:0}.article-prose blockquote ul,.article-prose blockquote ol{margin-bottom:0}.article-prose a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}.article-prose img{display:block;margin:28px auto;border:1px solid var(--line);background:var(--white)}.article-prose strong{font-weight:600}.article-prose code{font:13px/1.7 var(--mono);background:var(--wash);padding:2px 5px}.article-prose pre{padding:18px;background:var(--wash);overflow:auto;font:13px/1.7 var(--mono);border:1px solid var(--line)}.article-prose pre code{padding:0;background:none}.article-prose table{width:100%;border-collapse:collapse;font:13px/1.7 var(--sans)}.article-prose th,.article-prose td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line)}.article-prose th{font-weight:500;background:var(--wash)}.article-prose hr{border:0;border-top:1px solid var(--line);margin:35px 0}.table-scroll{max-width:100%;overflow:auto}.post-navigation{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:25px;border-top:1px solid var(--line);margin-top:44px;padding-top:24px}.post-navigation>a{font:20px/1.4 var(--serif)}.post-navigation .eyebrow{display:block;margin-bottom:9px}.translation-notice{font-size:13px;color:var(--muted);padding:12px 15px;background:var(--wash);margin-bottom:20px}.index-page{max-width:960px}.index-intro{padding:59px 0 34px;border-bottom:1px solid var(--line)}.index-intro h1{font-size:clamp(38px,4.5vw,55px);line-height:1.15;letter-spacing:-1.5px;margin:15px 0 17px}.index-intro>p:last-child{font-size:15px;color:var(--muted)}.archive-list{padding-top:23px}.archive-year{font-size:28px;color:var(--accent);padding:24px 0 11px}.archive-row{display:grid;grid-template-columns:82px minmax(0,1fr) 20px;gap:20px;padding:23px 0;border-bottom:1px solid var(--line);align-items:start;transition:padding .2s}.archive-row:hover{padding-left:8px}.archive-row time{font:11px/1.7 var(--mono);color:var(--muted);padding-top:4px}.archive-row h3{font-size:25px;line-height:1.3}.archive-row p{font-size:11px;color:var(--muted);margin-top:7px}.archive-row>span:last-child{color:var(--accent)}.topic-index{display:flex;flex-wrap:wrap;gap:13px;margin-top:28px}.topic-index>a{border:1px solid var(--line);padding:10px 14px;font-size:13px}.topic-count{font:11px/1.5 var(--mono);color:var(--muted);margin-left:14px}.topic-section{padding-top:45px;scroll-margin-top:25px}.topic-description{font-size:14px;color:var(--muted);margin:10px 0 26px}.index-intro+.notes-grid{margin-top:30px}
@media(min-width:1500px){.notebook-intro{padding-top:80px}.featured-note{padding-top:50px;padding-bottom:53px}.note-cover{height:210px}}
@media(max-width:950px){.site-width{width:calc(100% - 64px)}.featured-note{gap:32px}.featured-copy h2{font-size:34px}.post-layout{grid-template-columns:150px minmax(0,1fr);gap:34px}.post-header{margin-left:184px}.header-inner{gap:20px}.site-nav{gap:21px}.cover-connector{width:24px}.cover-circle{width:54px;height:54px}.concept-demo{padding:21px}.note-cover{height:170px}}
@media(max-width:720px){.site-width{width:calc(100% - 42px)}.header-inner{min-height:80px;gap:18px;flex-wrap:wrap;padding:20px 0}.wordmark{font-size:30px}.site-nav{gap:17px;font-size:12px}.language-switch{margin-left:auto}.notebook-intro{padding-top:42px;align-items:flex-start}.notebook-intro h1{font-size:46px;letter-spacing:-1.4px}.intro-signature{display:none}.featured-note{grid-template-columns:minmax(0,1fr);padding-top:29px;gap:26px}.featured-copy h2{font-size:36px;max-width:580px}.featured-visual{max-width:600px}.concept-demo{padding:23px}.policy-node,.log-record{min-height:98px}.notes-grid{gap:30px 22px}.note-card h3{font-size:23px}.post-header{margin-left:0;padding-top:31px}.post-layout{grid-template-columns:minmax(0,1fr);gap:25px}.contents-sidebar{position:static;max-height:none;overflow:visible}.contents-sidebar nav{display:flex;flex-direction:row;flex-wrap:wrap;gap:10px 20px;padding:12px 0 0;border:0;border-top:1px solid var(--line);margin-top:10px}.contents-sidebar a{max-width:100%}.contents-sidebar a[data-level='3']{display:none}.post-header h1{font-size:40px}.site-footer{margin-top:42px}.cover-circle{width:44px;height:44px;font-size:25px}.cover-page{width:38px;height:49px}.cover-connector{width:16px}.cover-locks>span:not(.cover-bar){width:45px;height:45px}.cover-bar{width:18px}.cover-clock{gap:14px;font-size:27px}.cover-schedule i{width:28px}}
@media(max-width:480px){.header-inner{gap:18px}.site-nav{order:3;width:100%;margin:0;justify-content:space-between}.language-switch{margin-left:auto}.notebook-intro{padding-top:31px;padding-bottom:29px}.notebook-intro h1{font-size:39px;line-height:1.13}.intro-copy{font-size:14px}.featured-copy h2{font-size:32px}.featured-summary{font-size:14px}.section-heading h2{font-size:25px}.section-heading{gap:15px}.notes-grid{grid-template-columns:minmax(0,1fr)}.note-cover{height:190px}.note-card h3{font-size:26px}.note-summary{font-size:14px}.topic-filters{gap:7px}.topic-filters button{padding:8px 10px}.concept-demo{padding:18px}.demo-header{gap:12px}.demo-switch button{padding:7px 8px}.policy-flow,.logging-flow{grid-template-columns:minmax(0,1fr) 17px minmax(0,1fr) 17px minmax(0,1fr);gap:4px;padding-top:27px}.policy-node,.log-record{min-height:86px;padding:12px 3px;gap:8px}.node-symbol{font-size:30px}.record-name{font-size:17px}.demo-caption{font-size:12px;min-height:61px}.demo-actions{gap:15px}.demo-controls{gap:10px}.post-header h1{font-size:35px;letter-spacing:-1px}.post-deck{font-size:14px}.article-prose{font-size:16.5px}.article-prose h2{font-size:27px}.article-prose h3{font-size:22px}.article-prose blockquote{padding:12px 15px;font-size:15px}.post-navigation{grid-template-columns:minmax(0,1fr)}.archive-row{grid-template-columns:55px minmax(0,1fr) 15px;gap:12px}.archive-row h3{font-size:23px}.index-intro{padding-top:36px}.index-intro h1{font-size:37px}.cover-circle{width:60px;height:60px;font-size:30px}.cover-page{width:48px;height:60px}.cover-connector{width:27px}.cover-clock{gap:25px;font-size:32px}.site-footer{gap:18px}.footer-links{width:100%;justify-content:space-between}}
@media(pointer:coarse){.language-switch button,.demo-switch button,.text-button,.topic-filters button{min-height:44px}.site-nav a{min-height:44px;display:flex;align-items:center}.topic-index>a{min-height:44px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{:root{color-scheme:light;--paper:#fff;--ink:#111;--muted:#555;--line:#ccc;--wash:#f5f5f5}.site-header,.site-footer,.contents-sidebar,.post-navigation,.concept-demo,.skip-link{display:none}.site-width{width:100%}.post-header{margin:0;padding-top:0}.post-layout{display:block}.article-prose{font-size:12pt}.article-prose a{color:inherit}.article-prose img{max-height:450px;object-fit:contain}}