@charset "UTF-8";
:root{--bg:#f8f9f5;--surface:#fff;--ink:#26352b;--muted:#798179;--line:#e1e6dc;--accent:#d9f577;--accent-ink:#617d31;--soft:#eef1e8;--card:#eff3e8;--code:#edf0e8;--shadow:0 10px 40px #24332108;color-scheme:light}
:root[data-theme=dark]{--bg:#171e19;--surface:#1d271f;--ink:#e3eadc;--muted:#a0ad9f;--line:#344235;--accent:#d9f577;--accent-ink:#c2dd8d;--soft:#263229;--card:#253127;--code:#202c22;--shadow:none;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit;cursor:pointer}button,a,input{-webkit-tap-highlight-color:transparent}button{border:0}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--accent-ink);outline-offset:5px}::selection{background:var(--accent);color:#26352b}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.45}button svg,a svg{flex-shrink:0}.icon{width:20px;height:20px;vertical-align:middle;flex-shrink:0}[hidden]{display:none!important}.page-width{max-width:1180px;width:calc(100% - 96px);margin-inline:auto}.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:-100px;left:20px;z-index:100;background:var(--accent);color:#26352b;padding:8px 18px}.skip-link:focus{top:10px}.site-header{height:88px;border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:30}.header-inner{height:100%;max-width:1340px;width:calc(100% - 96px);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:11px;white-space:nowrap;font-size:19px;font-weight:750;letter-spacing:-.5px}.logo-mark{width:35px;height:35px;border-radius:9px;background:var(--accent);color:#26352b;display:grid;place-items:center}.logo-mark svg{width:29px;height:29px}.brand-en{font-size:10px;letter-spacing:1.4px;font-weight:450;color:var(--muted);margin-left:8px}.site-header nav{display:flex;align-items:center;gap:33px;font-size:13px}.site-header nav>a{position:relative;padding:9px 0}.site-header nav>a:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--accent-ink);transform:scaleX(0);transition:transform .18s}.site-header nav>a:hover:after,.site-header nav>a[aria-current=page]:after{transform:scaleX(1)}.nav-divider{height:18px;width:1px;background:var(--line);margin-left:2px}.icon-button{width:34px;height:34px;display:inline-grid;place-items:center;background:transparent;border-radius:50%}.icon-button:hover{background:var(--soft)}.sun-icon{display:none}[data-theme=dark] .moon-icon{display:none}[data-theme=dark] .sun-icon{display:block}.hero{display:grid;grid-template-columns:1.3fr 1fr;gap:60px;align-items:center;padding-block:78px 75px}.eyebrow{display:flex;align-items:center;gap:8px;font:10px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:1.75px;font-weight:500}.live-dot{height:6px;width:6px;border-radius:50%;background:var(--accent-ink);box-shadow:0 0 0 4px var(--soft);margin-right:3px}.hero h1{font-size:clamp(36px,4.25vw,61px);letter-spacing:-2px;line-height:1.38;margin:25px 0 22px;font-weight:750}.hero h1>span{color:var(--accent-ink)}.hero-description{font-size:14px;line-height:2;color:var(--muted);margin-bottom:29px}.button-primary{background:var(--ink);color:var(--bg);display:inline-flex;align-items:center;gap:33px;padding:12px 20px;font-size:13px;border-radius:4px;transition:transform .2s,opacity .2s}.button-primary:hover{transform:translateY(-2px);opacity:.9}.button-primary svg{width:17px}.hero-footnote{display:flex;align-items:center;gap:9px;margin-top:25px;font-size:10px;color:var(--muted);letter-spacing:.4px}.small-star{font-size:20px;color:var(--accent-ink)}.learning-graphic{align-self:center;height:374px;position:relative;border:1px solid var(--line);border-radius:4px;background-color:var(--soft);background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:12px 12px;transform:rotate(-2deg);margin:7px 2px 0 0}.graphic-top,.graphic-bottom{display:flex;align-items:center;justify-content:space-between;position:absolute;left:21px;right:21px;z-index:1;font:9px ui-monospace,Consolas,monospace;letter-spacing:1.2px;color:var(--muted)}.graphic-top{top:20px}.graphic-coordinate{font-size:8px}.graphic-bottom{bottom:19px;letter-spacing:.3px}.graphic-bottom>span:last-child{font-size:23px}.loop-art{position:absolute;inset:11px 0 0;width:100%;height:340px}.orbit{stroke:var(--muted);stroke-dasharray:2 7;opacity:.6}.inner-orbit{stroke:var(--line)}.orbit-arrow{stroke:var(--accent-ink);stroke-width:1.6}.orbit-node{fill:var(--accent);stroke:var(--accent-ink);stroke-width:2}.center-check{stroke:var(--accent-ink);stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round}.loop-label{position:absolute;z-index:2;background:var(--bg);box-shadow:var(--shadow);border:1px solid var(--line);padding:8px 13px;display:grid;gap:1px;min-width:103px;transform:rotate(2deg)}.loop-label small{font:8px ui-monospace,Consolas,monospace;letter-spacing:1px;color:var(--muted)}.loop-label strong{font-size:14px;font-weight:550}.loop-one{top:58px;left:30%}.loop-two{top:213px;right:11px}.loop-three{top:213px;left:15px}.graphic-sticker{position:absolute;right:-15px;top:76px;padding:13px 16px;background:var(--accent);color:#34412c;font-size:11px;line-height:1.7;letter-spacing:1px;transform:rotate(9deg);box-shadow:2px 4px 0 #26352b0a}.content-section{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:65px;border-top:1px solid var(--line);padding-top:48px;align-items:start}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.section-heading .eyebrow{font-size:9px;color:var(--muted);margin-bottom:4px}.section-heading h2{font-size:25px;font-weight:650;margin:0;letter-spacing:-.5px}.heading-dot{color:var(--accent-ink);margin-left:3px}.text-link{display:inline-flex;align-items:center;gap:9px;font-size:11px;white-space:nowrap}.text-link .icon{width:15px}.text-link:hover{color:var(--accent-ink)}.search-wrap{position:relative;display:flex;align-items:center;gap:11px;background:var(--surface);border:1px solid var(--line);height:44px;border-radius:4px;padding:0 13px;color:var(--muted)}.search-wrap:focus-within{border-color:var(--accent-ink)}.search-wrap .icon{width:17px}.search-wrap input{border:0;background:none;outline:none!important;width:100%;height:100%;min-width:0;color:var(--ink);font-size:12px}.search-wrap input::placeholder{color:var(--muted)}.search-wrap kbd{font:10px ui-monospace,monospace;background:var(--soft);border:1px solid var(--line);border-radius:3px;padding:0 6px}.filter-tabs{display:flex;align-items:center;gap:4px;padding:17px 0 14px;border-bottom:1px solid var(--line);flex-wrap:wrap}.filter-tabs button{padding:5px 11px;background:transparent;border-radius:4px;font-size:11px;color:var(--muted);white-space:nowrap}.filter-tabs button.active{background:var(--ink);color:var(--bg)}.filter-tabs button span{font:9px ui-monospace,monospace;margin-left:6px;opacity:.65}.filter-tabs button:not(.active):hover{background:var(--soft);color:var(--ink)}.post-row{display:flex;gap:20px;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:28px 0 25px}.post-content{min-width:0;flex:1}.post-meta{display:flex;align-items:center;gap:9px;font-size:10px;color:var(--muted);flex-wrap:wrap}.category-text{color:var(--accent-ink);font-weight:600}.meta-dot{opacity:.6}.demo-label{border:1px solid var(--line);border-radius:3px;color:var(--muted);font:9px/1.5 -apple-system,"Microsoft YaHei",sans-serif;display:inline-flex;padding:1px 5px;white-space:nowrap}.post-row h3{font-size:20px;letter-spacing:-.2px;font-weight:650;margin:10px 0 9px;line-height:1.5}.post-row h3 a:hover{color:var(--accent-ink)}.post-row p{color:var(--muted);font-size:12px;line-height:1.9;max-width:600px;margin-bottom:17px}.post-bottom{display:flex;align-items:center;gap:20px;font-size:10px;color:var(--muted)}.post-bottom time{font:10px ui-monospace,Consolas,monospace;white-space:nowrap}.post-tags{display:flex;gap:12px;font-size:10px;flex-wrap:wrap;color:var(--muted)}.post-tags a:hover{color:var(--accent-ink)}.post-arrow{border:1px solid var(--line);height:37px;width:37px;border-radius:50%;display:grid;place-items:center;transition:background .18s,transform .18s;flex-shrink:0}.post-arrow svg{width:17px}.post-arrow:hover{background:var(--accent);color:#26352b;transform:rotate(6deg);border-color:var(--accent)}.list-end{display:flex;align-items:center;justify-content:center;gap:12px;font-size:10px;color:var(--muted);padding:33px 0}.list-end span{width:24px;height:1px;background:var(--line)}.intro-note{background:var(--card);border:1px solid var(--line);border-radius:4px;padding:25px 25px 23px;position:relative}.intro-note>.eyebrow{font-size:8px;letter-spacing:1.4px;color:var(--muted)}.note-symbol{display:block;font-size:32px;margin:15px 0 13px;line-height:1;color:var(--accent-ink)}.intro-note h2{font-size:22px;line-height:1.65;font-weight:600;letter-spacing:-.5px;margin-bottom:13px}.intro-note p{font-size:11px;line-height:2;color:var(--muted);margin-bottom:17px}.intro-note .text-link{font-size:10px}.topic-section{margin-top:31px}.topic-section h2{font-size:12px;font-weight:600;display:flex;justify-content:space-between;align-items:center;padding-bottom:12px;border-bottom:1px solid var(--line);margin-bottom:0}.topic-section h2>span{font:8px ui-monospace,monospace;letter-spacing:1px;color:var(--muted)}.topic-list>a{display:flex;align-items:center;gap:12px;font-size:12px;padding:14px 0;border-bottom:1px solid var(--line)}.topic-list>a:hover{color:var(--accent-ink)}.topic-num{font:9px ui-monospace,monospace;color:var(--muted)}.topic-count{margin-left:auto;font:9px ui-monospace,monospace;background:var(--soft);height:17px;min-width:17px;display:grid;place-items:center;border-radius:3px;color:var(--muted)}.topic-list .icon{width:11px;color:var(--muted)}.start-note{margin-top:29px;padding-left:16px;border-left:2px solid var(--accent-ink)}.start-note .eyebrow{font-size:8px;color:var(--muted)}.start-note h3{font-size:13px;margin:9px 0 8px;font-weight:600}.start-note p{font-size:11px;line-height:2;color:var(--muted);margin-bottom:12px}.start-note a{font-size:10px;display:flex;align-items:center;gap:15px}.start-note a:hover{color:var(--accent-ink)}.start-note .icon{width:15px}.rss-box{display:flex;align-items:center;gap:11px;border-top:1px solid var(--line);padding-top:20px;margin-top:28px;font-size:10px}.rss-box>.icon:first-child{width:18px;color:var(--accent-ink)}.rss-box small{display:block;color:var(--muted);font-size:9px;margin-top:3px}.rss-box>.icon:last-child{margin-left:auto;width:14px}.bottom-note{border-top:1px solid var(--line);padding:36px 0 48px;margin-top:46px}.bottom-note>span{font:8px ui-monospace,monospace;letter-spacing:1.5px;color:var(--muted)}.bottom-note p{font-size:28px;letter-spacing:-.5px;font-weight:300;margin:12px 0 0;display:flex;align-items:center;gap:5px}.bottom-note p strong{font-weight:600}.bottom-note p>span{margin-left:auto;font-size:43px;color:var(--accent-ink);line-height:1}.site-footer{border-top:1px solid var(--line);padding:33px max(48px,calc((100vw - 1180px)/2)) 37px;display:flex;justify-content:space-between;align-items:start;gap:24px}.footer-name{font-size:13px;font-weight:600}.footer-name>span{margin-left:5px;font-size:11px;color:var(--accent-ink)}.site-footer p{font-size:10px;margin:6px 0 0;color:var(--muted)}.footer-right{display:flex;align-items:end;flex-direction:column;gap:13px;font-size:9px;color:var(--muted)}.footer-right a{font-size:10px;color:var(--ink);display:flex;align-items:center;gap:6px}.footer-right .icon{width:12px}.back-top{position:fixed;right:26px;bottom:26px;width:38px;height:38px;background:var(--surface);border:1px solid var(--line);opacity:0;visibility:hidden;transition:opacity .2s;z-index:15;font-size:19px}.back-top.visible{opacity:1;visibility:visible}.empty-state{text-align:center;padding:55px 20px;border-bottom:1px solid var(--line)}.empty-state>.icon{width:27px;height:27px;color:var(--muted);margin-bottom:14px}.empty-state h3{font-size:18px;margin:0 0 8px}.empty-state p{font-size:12px;color:var(--muted);margin-bottom:20px}.button-outline{background:transparent;border:1px solid var(--line);border-radius:4px;padding:7px 15px;font-size:12px}.button-outline:hover{background:var(--soft)}
/* Reading pages */
.reading-progress{height:3px;position:fixed;left:0;top:0;width:0;background:var(--accent-ink);z-index:50}.article-page{padding-top:39px;max-width:1080px}.back-link{font-size:11px;color:var(--muted);display:inline-block;margin-bottom:38px}.back-link:hover{color:var(--accent-ink)}.article-header{max-width:790px;padding-bottom:28px}.article-header h1{font-size:clamp(28px,3.5vw,43px);line-height:1.5;font-weight:650;letter-spacing:-1px;margin:18px 0 16px}.article-summary{font-size:15px;line-height:1.9;color:var(--muted);max-width:720px;margin-bottom:25px}.article-byline{display:flex;align-items:center;gap:10px;font-size:11px}.author-avatar{background:var(--soft);color:var(--accent-ink);width:33px;height:33px;display:grid;place-items:center;border-radius:50%;font-size:24px}.article-byline time{display:block;font:9px/1.8 ui-monospace,monospace;color:var(--muted)}.article-byline>.post-tags{margin-left:auto}.article-layout{display:grid;grid-template-columns:minmax(0,730px) 240px;gap:70px;border-top:1px solid var(--line);padding-top:32px}.prose{font-size:15px;line-height:2.05;overflow-wrap:anywhere}.prose p{margin:0 0 19px}.prose h2{font-size:23px;font-weight:650;margin:39px 0 17px;letter-spacing:-.5px;scroll-margin-top:115px}.prose h2:first-child{margin-top:0}.prose h3{font-size:18px;font-weight:600;margin:30px 0 12px;scroll-margin-top:115px}.prose a{color:var(--accent-ink);text-decoration:underline;text-underline-offset:4px}.prose ul,.prose ol{margin:0 0 23px;padding-left:24px}.prose li{padding-left:3px;margin-bottom:8px}.prose li::marker{color:var(--accent-ink)}.prose strong{font-weight:650}.prose blockquote{border-left:3px solid var(--accent-ink);padding:14px 20px;background:var(--soft);margin:25px 0;color:var(--ink)}.prose blockquote p{margin:0}.prose code{font:12px/1.8 ui-monospace,Consolas,monospace;background:var(--code);padding:3px 5px;border-radius:3px}.code-block{background:var(--code);border:1px solid var(--line);border-radius:5px;margin:24px 0;overflow:hidden}.code-toolbar{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:6px 15px;color:var(--muted);font:10px/1.8 ui-monospace,Consolas,monospace}.code-toolbar button{background:transparent;font:10px/1.8 -apple-system,"Microsoft YaHei",sans-serif;color:var(--muted);padding:2px 7px}.code-toolbar button:hover{color:var(--ink)}.code-block pre{margin:0;padding:17px 20px;overflow-x:auto;line-height:1.8}.code-block pre code{padding:0;font-size:12px;white-space:pre}.demo-notice{font-size:11px;line-height:1.9;background:var(--soft);border:1px solid var(--line);padding:12px 16px;border-radius:4px;margin-bottom:33px;color:var(--muted)}.demo-notice strong{font-weight:500;color:var(--ink)}.article-toc>div{position:sticky;top:122px}.article-toc h2{font-size:11px;font-weight:500;display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;margin:0 0 13px;border-bottom:1px solid var(--line)}.article-toc h2 span{font:8px ui-monospace,monospace;letter-spacing:1px;color:var(--muted)}.article-toc nav{display:flex;flex-direction:column;gap:12px;border-left:1px solid var(--line);padding-left:15px}.article-toc nav a{font-size:11px;line-height:1.7;color:var(--muted)}.article-toc nav a.active,.article-toc nav a:hover{color:var(--accent-ink)}.article-toc nav .toc-level-3{padding-left:12px;font-size:10px}.toc-rss{display:flex;gap:8px;align-items:center;margin-top:25px;padding-top:17px;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}.toc-rss .icon{width:14px}.article-end{display:flex;align-items:center;justify-content:center;gap:9px;color:var(--muted);font-size:11px;margin:47px 0 25px;padding-top:25px;border-top:1px solid var(--line)}.article-end>span{font-size:25px;color:var(--accent-ink)}.related-posts{padding:35px 0 60px;margin-top:30px;border-top:1px solid var(--line);max-width:730px}.related-posts .section-heading{margin-bottom:0}.related-posts h2{font-size:22px}.related-posts .post-row h3{font-size:18px}.simple-page{padding-block:70px 100px;min-height:70vh}.simple-page>.eyebrow{color:var(--muted)}.simple-page>h1{font-size:45px;line-height:1.5;letter-spacing:-1.6px;font-weight:650;margin:22px 0}.simple-page>h1>span{color:var(--accent-ink)}.page-description{color:var(--muted);font-size:13px;margin-bottom:55px}.archive-body{max-width:900px}.archive-month h2{font:22px ui-monospace,Consolas,monospace;border-bottom:1px solid var(--line);padding:0 0 20px;display:flex;align-items:center;gap:20px;margin-bottom:0}.archive-month h2>span{font:11px -apple-system,"Microsoft YaHei",sans-serif;color:var(--muted)}.archive-row{display:flex;align-items:center;gap:25px;padding:22px 0;border-bottom:1px solid var(--line);font-size:15px}.archive-row:hover{color:var(--accent-ink)}.archive-row time{font:10px ui-monospace,monospace;color:var(--muted)}.archive-row>span{display:flex;align-items:center;gap:10px;flex:1;flex-wrap:wrap}.archive-row small{font-size:10px;color:var(--muted)}.archive-row>.icon{width:16px}.about-grid{display:grid;grid-template-columns:minmax(0,680px) 270px;gap:100px;align-items:start;padding-top:35px;border-top:1px solid var(--line)}.about-card{background:var(--soft);border:1px solid var(--line);padding:25px;position:sticky;top:130px}.about-card>span{font-size:50px;color:var(--accent-ink);line-height:1}.about-card p{font:34px/1.35 ui-monospace,Consolas,monospace;font-weight:700;letter-spacing:-1.5px;margin:27px 0 40px}.about-card p span{color:var(--accent-ink)}.about-card small{font-size:10px;color:var(--muted)}.not-found{padding-block:100px 130px;min-height:70vh}.not-found h1{font-size:48px;letter-spacing:-1px;margin:25px 0}.not-found p{color:var(--muted);margin-bottom:25px}
@media(min-width:1550px){.hero{padding-block:95px 85px}.hero h1{font-size:62px}.learning-graphic{height:390px}}
@media(max-width:1100px){.brand-en{display:none}.hero{gap:40px}.hero h1{font-size:43px}.learning-graphic{height:340px}.loop-art{height:310px;inset:10px 0 0}.loop-one{top:57px;left:27%}.loop-two,.loop-three{top:198px}.graphic-sticker{top:65px;right:-13px;padding:11px}.loop-label{padding:7px 10px;min-width:93px}.content-section{gap:38px;grid-template-columns:minmax(0,1fr) 240px}.intro-note{padding:22px}.article-layout{gap:40px;grid-template-columns:minmax(0,1fr) 200px}.about-grid{gap:50px}.header-inner{width:calc(100% - 64px)}.page-width{width:calc(100% - 64px)}.site-footer{padding-inline:32px}.post-row h3{font-size:18px}.post-tags{gap:8px}.hero .eyebrow{font-size:9px;letter-spacing:1px}}
@media(max-width:800px){.site-header{height:74px}.brand{font-size:17px}.site-header nav{gap:22px}.hero{padding-block:52px;grid-template-columns:1.1fr 1fr;gap:30px}.hero h1{font-size:35px;letter-spacing:-1.5px}.hero-description{font-size:12px}.hero-footnote{font-size:9px}.hero .eyebrow{font-size:8px;letter-spacing:.5px}.learning-graphic{height:300px}.loop-art{height:274px;inset:10px 0 0}.loop-one{top:54px;left:22%}.loop-two,.loop-three{top:167px}.loop-label{min-width:80px;padding:5px 9px}.loop-label strong{font-size:12px}.loop-label small{font-size:7px}.loop-three{left:4px}.loop-two{right:4px}.graphic-sticker{font-size:9px;padding:9px;right:-9px;top:66px}.graphic-top,.graphic-bottom{font-size:7px;left:13px;right:13px}.content-section{grid-template-columns:minmax(0,1fr) 210px;gap:28px}.intro-note{padding:18px}.intro-note h2{font-size:19px}.section-heading h2{font-size:23px}.post-row{padding-block:24px}.post-arrow{width:32px;height:32px}.post-row h3{font-size:17px}.post-bottom{gap:12px}.post-tags{font-size:9px}.bottom-note p{font-size:24px}.article-layout{grid-template-columns:minmax(0,1fr)}.article-toc{display:none}.article-header{max-width:100%}.article-page{max-width:780px}.related-posts{max-width:none}.about-grid{grid-template-columns:minmax(0,1fr) 210px;gap:35px}.about-card p{font-size:29px}}
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@media(max-width:370px){.page-width,.header-inner{width:calc(100% - 30px)}.brand{font-size:14px}.site-header nav{gap:13px}.logo-mark{width:26px;height:26px}.hero h1{font-size:35px}.filter-tabs button{padding-inline:7px}.home-sidebar{gap:20px 15px}.intro-note{padding:18px;column-gap:15px}.intro-note h2{font-size:18px}.learning-graphic{height:264px}.loop-three{left:14px}.loop-two{right:14px}.graphic-sticker{right:1px}.post-row h3{font-size:17px}}
.has-knocket .back-top{bottom:calc(102px + env(safe-area-inset-bottom, 0px))}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}