@charset "UTF-8";
:root{--paper:#f8f7f3;--white:#fff;--ink:#233b35;--text:#39433e;--muted:#727a74;--line:#e1e3da;--green:#2f5b49;--soft:#e9eee6;--accent:#d19255;--radius:5px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;font-size:15px;line-height:1.8;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #a97438;outline-offset:5px}a:hover{color:var(--green)}[hidden]{display:none!important}.shell{width:min(1120px,calc(100% - 80px));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:10px;left:10px;z-index:10;background:var(--ink);color:#fff;padding:8px 16px;transform:translateY(-180%)}.skip-link:focus{transform:translateY(0)}
.site-header{border-bottom:1px solid var(--line)}.header-inner{height:94px;display:flex;align-items:center;gap:40px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:700;font-size:20px;letter-spacing:.3px;white-space:nowrap}.brand-icon{display:grid;place-items:center;width:33px;height:36px;border-radius:7px 7px 7px 0;background:var(--ink);color:#faf8ee;font-size:20px;font-family:serif}.brand-dot{color:var(--accent);font-size:26px}.header-inner nav{display:flex;gap:28px;margin-left:auto;font-size:14px}.header-inner nav a{padding:8px 0}.header-label{font-size:12px;letter-spacing:1px;color:#858c83;border-left:1px solid var(--line);padding-left:26px}
.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:72px;padding-top:70px;padding-bottom:74px;align-items:center}.eyebrow{font-size:12px;letter-spacing:2px;margin:0 0 22px;color:var(--green);display:flex;align-items:center;gap:9px}.eyebrow>span{width:6px;height:6px;background:var(--accent);border-radius:50%}.hero h1{font-size:clamp(36px,3.9vw,50px);font-weight:600;line-height:1.5;letter-spacing:1.5px;color:var(--ink);margin:0 0 20px}.title-dot{color:var(--accent)}.hero-description{max-width:440px;color:var(--muted);line-height:1.95;font-size:14px;margin:0 0 27px}.primary-link{display:inline-flex;gap:37px;align-items:center;color:#fff;background:var(--ink);border-radius:var(--radius);padding:12px 21px;font-size:14px}.primary-link:hover{background:var(--green);color:#fff}.primary-link span{font-size:19px}.hero-caption{font-size:11px;letter-spacing:1px;margin:19px 0 0;color:#8b9088}.hero-notebook{position:relative;transform:rotate(1.5deg);background:#e9eee5;border:1px solid #dae0d4;border-radius:7px;padding:0 22px 22px;isolation:isolate;box-shadow:6px 9px 0 #efede5}.notebook-top{display:flex;align-items:center;gap:9px;height:50px;color:#74846f;font-size:9px;letter-spacing:2px}.mini-mark{font-size:23px;color:var(--green)}.notebook-index{margin-left:auto;letter-spacing:1px}.notebook-paper{background:#fffefa;border:1px solid #e0e4d9;padding:27px 29px 22px}.paper-kicker{font-size:11px;color:#86907d;letter-spacing:2px;margin:0 0 12px}.notebook-paper h2{font-size:23px;letter-spacing:2px;font-weight:500;line-height:1.65;margin:0 0 22px;color:var(--ink)}.code-example{position:relative;background:#f2f3ed;border-left:2px solid #a4b59a;padding:28px 15px 15px;overflow:hidden}.code-language{position:absolute;top:9px;right:12px;color:#959c8e;font-size:8px;letter-spacing:1.4px}.code-example pre{font-size:11px;line-height:1.9;overflow:auto;margin:0}.code-example code{font-family:Consolas,"Microsoft YaHei",monospace;color:#4e614d}.code-muted{color:#969d8d}.code-string{color:#60846a}.paper-bottom{display:flex;gap:15px;flex-wrap:wrap;font-size:10px;color:#8a9184;margin-top:21px}.paper-bottom i{font-style:normal;color:#758f68;padding-right:3px}.notebook-decoration{position:absolute;right:-16px;bottom:28px;font-size:10px;letter-spacing:3px;background:#d8ad75;color:#5d503f;padding:8px 14px;transform:rotate(-5deg);border-radius:2px;z-index:1}
.topics-band{border-block:1px solid var(--line)}.topics-grid{display:grid;grid-template-columns:repeat(3,1fr);padding:23px 0}.topic-item{display:flex;align-items:center;gap:17px;padding:2px 30px}.topic-item:first-child{padding-left:0}.topic-item:last-child{padding-right:0}.topic-item+.topic-item{border-left:1px solid var(--line)}.topic-symbol{font-size:26px;color:#7c8d72;font-family:Consolas,monospace;min-width:36px}.topic-item strong{font-size:14px;font-weight:500;color:var(--ink);display:block}.topic-item small{display:block;font-size:11px;color:#858c80;margin-top:1px}.topic-arrow{margin-left:auto;font-size:18px;color:#87927e}
.notes-section{padding-block:65px 54px}.section-heading{display:flex;justify-content:space-between;gap:25px;align-items:flex-end;margin-bottom:27px}.section-kicker{font-size:9px;letter-spacing:2.4px;margin:0 0 8px;color:#87907f}.section-heading h2{font-size:28px;letter-spacing:1px;font-weight:500;color:var(--ink);line-height:1.4;margin:0}.section-heading>p{font-size:12px;color:#8a9087;margin:0 0 4px}.notes-toolbar{display:flex;gap:22px;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:20px}.filter-list{display:flex;gap:8px;flex-wrap:wrap}.filter-button{border:0;border-radius:4px;background:transparent;color:#7d847a;padding:7px 13px;font-size:12px;white-space:nowrap}.filter-button:hover{background:#edefe7}.filter-button.is-active{background:var(--soft);color:var(--green)}.search-box{display:flex;align-items:center;gap:8px;color:#8c9587;border:1px solid var(--line);background:transparent;border-radius:4px;padding:6px 11px;width:218px;flex-shrink:0}.search-box:focus-within{border-color:#92a58a}.search-box input{border:0;background:transparent;color:var(--text);outline:none;width:100%;min-width:0;font-size:12px}.search-box input::placeholder{color:#979d93}.search-box input:focus-visible{outline:none}.result-count{font-size:11px;color:#91988b;margin:16px 0}.notes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.note-card{background:#fffefa;border:1px solid var(--line);border-radius:var(--radius);padding:27px 29px 23px;transition:transform .18s,border-color .18s}.note-card:hover{border-color:#b3bca8;transform:translateY(-2px)}.note-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:15px}.category-label{font-size:10px;letter-spacing:.5px;color:#6b8061;background:#edf0e7;padding:3px 8px;border-radius:3px}.note-number{font-size:10px;color:#9a9e92;letter-spacing:1px}.note-card h3{font-size:18px;line-height:1.65;font-weight:500;color:var(--ink);margin:0 0 8px}.note-card>p{font-size:12px;line-height:1.9;color:#8a8f84;margin:0 0 22px}.read-link{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#697c5d;border-top:1px solid #edf0e7;padding-top:16px}.read-link span{font-size:17px}.empty-state{text-align:center;padding:45px 10px;background:#fffefa;border:1px dashed var(--line)}.empty-state h3{font-weight:500}.empty-state p{color:var(--muted);font-size:13px}.empty-state button{background:var(--soft);border:1px solid var(--line);border-radius:4px;color:var(--green);padding:7px 15px;font-size:13px}
.about-section{display:grid;grid-template-columns:1fr 2fr;gap:55px;border-top:1px solid var(--line);padding-block:35px 50px}.about-label{display:flex;gap:13px;align-items:flex-start;padding-top:4px}.about-label>span{color:#9ca98c;font-size:28px;line-height:1.4}.about-label h2{font-size:17px;font-weight:500;color:var(--ink);margin:7px 0 0}.about-copy p{color:#7e8678;font-size:12px;line-height:2.1;margin:8px 0}.site-footer{background:#efefe8;border-top:1px solid var(--line)}.footer-inner{text-align:center;padding-block:23px 24px;color:#8c9386;font-size:11px}.footer-inner p{margin:0 0 6px}.footer-separator{padding-inline:10px;color:#b8bdb0}.icp-link{display:inline-block;color:#747e6d;font-size:12px;padding:3px 6px}.icp-link:hover{text-decoration:underline}.icp-pending{color:#8c6843}
.article-shell{width:min(780px,calc(100% - 80px));margin:0 auto;padding-top:36px;padding-bottom:55px}.back-link{font-size:12px;color:#7d8973}.article-heading{margin-top:32px;padding-bottom:26px;border-bottom:1px solid var(--line)}.article-index{font-size:10px;letter-spacing:1px;color:#9a9e92;display:inline-block;margin-left:14px}.article-heading h1{font-size:32px;font-weight:500;color:var(--ink);line-height:1.6;letter-spacing:.5px;margin:15px 0 13px}.article-heading>p:last-child{font-size:14px;color:var(--muted);line-height:1.9;margin:0}.article-content{padding-top:18px;font-size:14px;line-height:2}.article-content h2{font-size:20px;font-weight:500;color:var(--ink);margin:32px 0 12px}.article-content p{margin:12px 0}.article-content .article-lead{font-size:16px;color:#64735d;margin-block:15px 26px}.article-content pre{overflow:auto;padding:20px 23px;background:#eef0e8;border:1px solid #dfe4d6;border-radius:4px;font-size:12px;line-height:1.9;color:#40553c}.article-content code{font-family:Consolas,"Microsoft YaHei",monospace}.article-content :not(pre)>code{background:#ecefe5;padding:2px 5px;border-radius:3px;font-size:.92em;overflow-wrap:anywhere}.article-content a{color:var(--green);text-decoration:underline;text-underline-offset:4px}.article-content ul,.article-content ol{padding-left:24px}.article-content li{margin:7px 0}.article-content blockquote{margin:22px 0;border-left:3px solid #9cae8d;padding:13px 20px;background:#f0f2e9;color:#6b785e}.takeaway{background:#ecefe5;border-left:3px solid #97aa87;padding:18px 23px;margin-top:30px}.takeaway strong{font-weight:500;color:var(--green)}.takeaway p{font-size:13px;color:#6e7b62;margin-bottom:0}.next-note{border-top:1px solid var(--line);margin-top:40px;padding-top:24px}.next-note>span{display:block;font-size:11px;color:#929b88;margin-bottom:6px}.next-note>a{display:flex;justify-content:space-between;gap:20px;color:var(--green);font-size:15px}
@media(min-width:1550px){.hero{padding-top:85px;padding-bottom:85px}}
@media(max-width:1000px){.shell{width:calc(100% - 56px)}.hero{gap:40px}.hero h1{font-size:38px}.header-label{display:none}.notebook-paper{padding:22px}.paper-bottom{gap:9px}.topic-item{padding-inline:20px;gap:12px}.topic-symbol{font-size:23px;min-width:30px}.section-heading>p{max-width:240px}.note-card{padding:23px}.note-card h3{font-size:17px}}
@media(max-width:740px){.shell{width:calc(100% - 40px)}.header-inner{height:auto;min-height:82px;gap:15px;flex-wrap:wrap;padding-block:18px}.brand{font-size:18px}.brand-icon{width:29px;height:31px;font-size:18px}.header-inner nav{gap:18px;font-size:12px}.hero{grid-template-columns:1fr;gap:40px;padding-top:40px;padding-bottom:44px}.hero h1{font-size:40px;line-height:1.45;letter-spacing:1px}.hero-description{max-width:490px}.hero-notebook{max-width:450px;width:calc(100% - 12px);margin-inline:auto;transform:rotate(1deg)}.notebook-paper{padding:24px}.notebook-paper h2{font-size:23px}.paper-bottom{gap:18px}.code-example pre{font-size:12px}.topics-grid{grid-template-columns:1fr;padding-block:7px}.topic-item,.topic-item:first-child,.topic-item:last-child{padding:16px 0}.topic-item+.topic-item{border-left:0;border-top:1px solid var(--line)}.topic-item small{font-size:12px}.topic-item strong{font-size:14px}.topic-symbol{min-width:36px}.topic-arrow{padding-right:4px}.notes-section{padding-block:39px}.section-heading{display:block;margin-bottom:23px}.section-heading h2{font-size:26px}.section-heading>p{max-width:none;margin-top:11px}.notes-toolbar{align-items:stretch;gap:15px;flex-direction:column;padding-bottom:16px}.filter-list{gap:6px}.filter-button{padding:7px 10px}.search-box{width:100%;padding:8px 10px}.notes-grid{grid-template-columns:1fr;gap:16px}.note-card{padding:23px}.note-card h3{font-size:18px}.note-card>p{font-size:13px}.read-link{font-size:12px}.about-section{grid-template-columns:1fr;gap:9px;padding-block:23px 32px}.about-copy p{font-size:13px}.about-label h2{font-size:18px}.footer-inner{font-size:10px;padding-block:21px}.footer-separator{padding-inline:6px}.icp-link{font-size:12px}.article-shell{width:calc(100% - 40px);padding-top:25px;padding-bottom:38px}.article-heading{margin-top:25px}.article-heading h1{font-size:26px;line-height:1.6}.article-content{font-size:14px}.article-content pre{padding:16px;font-size:11px}.article-content h2{font-size:19px}}
@media(max-width:390px){.header-inner{gap:12px}.header-inner nav{margin-left:0;width:100%;justify-content:space-between;padding-top:5px}.hero h1{font-size:35px}.filter-button{padding-inline:8px}.filter-list{gap:3px}.notebook-paper{padding:20px 15px}.hero-notebook{padding:0 15px 15px}.paper-bottom{gap:11px}.notebook-decoration{right:-9px}.footer-inner p>span:last-child{display:block}.footer-separator{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.note-card{transition:none}.note-card:hover{transform:none}}