@layer reset{*,:before,:after{box-sizing:border-box}body,h1,h2,h3,p{margin:0}[hidden]{display:none!important}img,svg{max-width:100%}button,input,select{font:inherit}button,summary{cursor:pointer}}@layer base{:root{color-scheme:light;--bg:#f7f7f2;--paper:#fff;--ink:#22332d;--muted:#5b6860;--accent:#214f3f;--soft:#e9efe5;--line:#d8dfd6;--serif:"Noto Serif SC", "Songti SC", "STSong", Georgia, serif}html{scroll-behavior:smooth;scroll-padding-top:24px}body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.7}a{color:inherit;text-underline-offset:4px}a:hover{color:var(--accent)}:focus-visible{outline-offset:4px;border-radius:3px;outline:3px solid #376aaf}::selection{background:#d8e9d8}h1,h2,h3{text-wrap:balance;line-height:1.35}h1{font-family:var(--serif);letter-spacing:-.035em;font-size:clamp(2rem,4vw,3.3rem);font-weight:600}h2{font-size:1.55rem;font-weight:650}h3{font-size:1.12rem}p{overflow-wrap:anywhere}button{color:inherit}time{font-variant-numeric:tabular-nums}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important}}}@layer components{.wrap{width:min(1120px,100% - 64px);margin-inline:auto}.skip-link{z-index:20;background:#fff;padding:12px;position:absolute;top:-100px;left:16px}.skip-link:focus{top:8px}.site-header{border-bottom:1px solid var(--line)}.header-inner{justify-content:space-between;align-items:center;gap:20px;min-height:108px;display:flex}.brand{flex-shrink:0;align-items:center;gap:12px;font-size:19px;font-weight:650;text-decoration:none;display:flex}.brand-mark{object-fit:contain;flex-shrink:0;width:42px;height:42px}.brand small{letter-spacing:.16em;color:var(--muted);margin-top:2px;font-size:9px;font-weight:450;display:block}.main-nav{align-items:center;gap:20px;display:flex}.main-nav a{border-bottom:2px solid #0000;align-items:center;min-height:44px;font-size:14px;text-decoration:none;display:flex}.main-nav a[aria-current]{border-color:var(--accent);font-weight:650}.search-link{border-left:1px solid var(--line);gap:8px;padding-left:20px}.search-link svg{width:18px;height:18px}.menu-toggle{border:1px solid var(--line);background:0 0;border-radius:6px;min-height:44px;padding:8px 12px;display:none}.hero{grid-template-columns:1.25fr 1fr;align-items:center;gap:70px;padding-block:76px 72px;display:grid}.eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-size:11px;font-weight:650}.hero h1{margin:20px 0 24px;font-size:clamp(2.4rem,4vw,3.55rem);line-height:1.38}.hero h1 em{color:var(--accent);font-style:normal}.hero-intro{max-width:500px;color:var(--muted);font-size:16px;line-height:1.9}.actions{flex-wrap:wrap;align-items:center;gap:18px;margin-top:30px;display:flex}.button{background:var(--accent);color:#fff;border-radius:5px;justify-content:center;align-items:center;gap:22px;min-height:48px;padding:11px 22px;font-size:14px;font-weight:600;text-decoration:none;display:inline-flex}.button:hover{color:#fff;background:#173c2f}.text-link{align-items:center;gap:8px;min-height:44px;font-size:14px;display:inline-flex}.hero-note{color:var(--muted);margin-top:22px;font-size:12px}.field-note{border:1px solid var(--line);background:#eeefe8;border-radius:10px;padding:30px}.field-note-top{border-bottom:1px solid #cbd4c7;justify-content:space-between;align-items:center;padding-bottom:19px;display:flex}.field-note-top span{font-family:Georgia,serif;font-size:23px;font-style:italic}.field-note-top small{color:var(--muted);letter-spacing:.13em;font-size:10px}.learning-loop{margin:0;padding:22px 0 12px;list-style:none}.learning-loop li{grid-template-columns:34px 1fr;gap:14px;padding:12px 0;display:grid}.loop-number{color:#697665;font-family:Georgia,serif;font-size:20px;font-style:italic}.learning-loop h2{font-size:15px}.learning-loop p{color:var(--muted);margin-top:3px;font-size:12px}.field-note-bottom{color:var(--muted);border-top:1px solid #cbd4c7;padding-top:17px;font-size:11px}.section{border-top:1px solid var(--line);padding-block:38px 52px}.section-heading{justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px;display:flex}.section-heading .eyebrow{margin-bottom:9px;display:block}.section-heading p{color:var(--muted);margin-top:8px;font-size:14px}.track-feature{border:1px solid var(--line);background:#fff;border-radius:7px;grid-template-columns:1fr 1.05fr;gap:48px;padding:30px 34px;display:grid}.track-feature h3{font-size:23px;font-family:var(--serif);margin:12px 0}.track-feature p{color:var(--muted);font-size:14px}.track-steps{margin:0;padding:0;list-style:none}.track-steps li+li{border-top:1px solid var(--line)}.track-steps a{align-items:center;gap:14px;padding:12px 0;font-size:14px;text-decoration:none;display:flex}.step-number{color:var(--muted);font-family:ui-monospace,monospace;font-size:12px}.track-steps .arrow{margin-left:auto}.cards{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.content-card{border:1px solid var(--line);background:#fff;border-radius:6px;flex-direction:column;min-width:0;padding:24px;display:flex}.content-card:hover{border-color:#8caa92}.card-meta{justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;display:flex}.topic-label{background:var(--soft);color:var(--accent);white-space:nowrap;border-radius:3px;padding:3px 8px;font-size:11px;text-decoration:none}.content-card h3 a{min-height:44px;padding-right:18px;line-height:1.55;text-decoration:none;display:block;position:relative}.card-arrow{color:var(--muted);font-size:16px;font-weight:400;position:absolute;top:2px;right:0}.content-card p{color:var(--muted);flex:1;margin-top:10px;font-size:13px;line-height:1.9}.card-bottom{color:var(--muted);border-top:1px solid #e8ece5;justify-content:space-between;align-items:center;gap:10px;margin-top:22px;padding-top:15px;font-size:10px;display:flex}.lab-card{border-top:3px solid var(--accent)}.topic-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;display:grid}.topic-tile{border:1px solid var(--line);background:#fff;border-radius:5px;justify-content:space-between;align-items:center;gap:10px;min-width:0;min-height:60px;padding:18px;font-size:14px;text-decoration:none;display:flex}.topic-tile:hover{background:var(--soft)}.topic-tile small{color:var(--muted);font-size:11px}.site-footer{border-top:1px solid var(--line);grid-template-columns:1fr auto;gap:25px;margin-top:40px;padding-block:34px;font-size:13px;display:grid}.site-footer p{color:var(--muted);margin-top:5px;font-size:12px}.footer-links{flex-wrap:wrap;align-items:center;gap:22px;display:flex}.footer-links a{align-items:center;min-height:44px;display:inline-flex}.footer-note{grid-column:1/-1}.page-head{padding-block:50px 34px}.page-head h1{margin:12px 0 16px}.page-head p{max-width:680px;color:var(--muted);line-height:1.9}.breadcrumb{color:var(--muted);flex-wrap:wrap;gap:8px;margin-bottom:28px;font-size:12px;display:flex}.breadcrumb a{min-height:24px}.filters{background:#eef0e9;border-radius:6px;grid-template-columns:2fr 1fr 1fr auto;align-items:end;gap:16px;padding:22px;display:grid}.filters label{color:var(--muted);margin-bottom:8px;font-size:12px;display:block}.filters input,.filters select{width:100%;min-width:0;min-height:44px;color:var(--ink);background:#fff;border:1px solid #b7c5b6;border-radius:4px;padding:10px;font-size:14px}.reset-button{background:0 0;border:0;min-height:44px;padding:10px 8px;font-size:13px;text-decoration:underline}.muted{color:var(--muted)}.result-count{margin-block:20px;font-size:12px}.empty-state{border:1px dashed var(--line);color:var(--muted);border-radius:6px;margin-block:24px;padding:30px}.article-head{max-width:760px;padding-top:44px}.article-head h1{margin:16px 0;font-size:clamp(1.85rem,3.1vw,2.7rem)}.article-head .summary{color:var(--muted);font-size:17px;line-height:1.9}.article-meta{color:var(--muted);flex-wrap:wrap;gap:8px 22px;margin-block:22px 28px;font-size:12px;display:flex}.article-grid{grid-template-columns:minmax(0,760px) 1fr;align-items:start;gap:60px;padding-bottom:30px;display:grid}.prose{min-width:0;font-size:18px;line-height:1.9}.prose h2{margin-top:2.5em;margin-bottom:.8em;font-size:1.35em}.prose h3{margin-top:1.8em;margin-bottom:.6em;font-size:1.1em}.prose p,.prose ul,.prose ol{margin-block:1.2em}.prose li{margin-bottom:.45em}.prose a{color:var(--accent);text-decoration-thickness:1px}.prose blockquote{background:var(--soft);border-left:3px solid #7f9d80;margin-inline:0;padding:.1em 1.3em}.prose code{overflow-wrap:anywhere;background:#eef1e9;border-radius:3px;padding:.15em .3em;font-size:.8em}.prose pre{border:1px solid var(--line);border-radius:6px;max-width:100%;padding:20px;font-size:14px;line-height:1.8;overflow-x:auto}.prose pre code{overflow-wrap:normal;background:0 0;padding:0}.prose table{border-collapse:collapse;max-width:100%;margin-block:24px;font-size:14px;display:block;overflow-x:auto}.prose th,.prose td{border-bottom:1px solid var(--line);text-align:left;min-width:90px;padding:12px}.prose th{background:var(--soft)}.toc{border-left:1px solid var(--line);margin-top:36px;padding-left:22px;font-size:12px;position:sticky;top:30px}.toc summary{min-height:44px;font-size:13px;font-weight:650}.toc ol{margin:0;padding:0;list-style:none}.toc a{color:var(--muted);padding:6px 0;text-decoration:none;display:block}.toc a:hover{color:var(--accent);text-decoration:underline}.toc-sub{padding-left:12px}.callout{background:var(--soft);border-left:3px solid var(--accent);margin-block:20px;padding:18px 22px;font-size:14px}.references{border:1px solid var(--line);background:#fff;border-radius:6px;margin-block:36px;padding:24px;font-size:14px}.references h2{margin:0 0 14px;font-size:18px}.references ul{margin:0;padding-left:20px}.references li{padding-block:7px}.references small{color:var(--muted);margin-top:3px;display:block}.article-relations{border-top:1px solid var(--line);margin-top:30px;padding-top:22px;font-size:14px}.article-relations h2{margin-bottom:12px;font-size:16px}.article-relations li{margin-block:8px}.track-page-steps{margin:30px 0;padding:0;list-style:none}.track-page-steps li{border:1px solid var(--line);background:#fff;border-radius:6px;grid-template-columns:40px 1fr;gap:15px;margin-bottom:14px;padding:22px;display:grid}.track-page-steps h2{margin:0;font-size:18px}.track-page-steps p{color:var(--muted);margin:10px 0 0;font-size:14px}.pagination{grid-template-columns:1fr 1fr;gap:16px;margin-block:24px;display:grid}.pagination a{background:var(--soft);border-radius:5px;padding:16px;font-size:14px;text-decoration:none;display:block}.pagination small{color:var(--muted);margin-bottom:6px;display:block}audio{width:100%;max-width:100%;margin-block:20px}@media (width<=960px){.main-nav{gap:14px}.hero{gap:35px;padding-block:52px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.article-grid{flex-direction:column;gap:0;max-width:760px;display:flex}.toc{border:1px solid var(--line);background:#eff1e9;border-radius:5px;order:-1;width:100%;margin-top:0;padding:12px 20px;position:static}.article-body{width:100%}}@media (width<=760px){.wrap{width:calc(100% - 40px)}.header-inner{flex-wrap:wrap;gap:0;min-height:88px;padding-block:15px}.menu-toggle{display:block}.main-nav{flex-wrap:wrap;flex-basis:100%;gap:4px 20px;padding-top:15px;display:none}.main-nav.is-open{display:flex}.search-link{border-left:0;padding-left:0}.hero{grid-template-columns:1fr;gap:32px;padding-block:40px}.hero h1{margin-top:16px;font-size:2.45rem}.field-note{padding:24px}.learning-loop{grid-template-columns:1fr 1fr;gap:12px;display:grid}.learning-loop li{grid-template-columns:26px 1fr;gap:8px}.track-feature{grid-template-columns:1fr;gap:20px;padding:24px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.filters{grid-template-columns:1fr 1fr;padding:18px}.filters>div:first-child{grid-column:1/-1}.filters .reset-button{grid-column:1/-1;justify-self:start}.site-footer{grid-template-columns:1fr;gap:14px}.section-heading{align-items:start}.section-heading>.text-link{white-space:nowrap}.page-head{padding-top:32px}.article-head{padding-top:28px}.prose{font-size:17px}.pagination{grid-template-columns:1fr}}@media (width<=520px){.cards{grid-template-columns:1fr}.hero h1{font-size:2.15rem}.section-heading h2{font-size:21px}.content-card{padding:22px}.learning-loop{grid-template-columns:1fr;gap:0}.learning-loop li{padding:8px 0}.topic-tile{padding:14px;font-size:13px}.footer-links{gap:16px}}}