:root{--ink: #171a18;--ink-soft: #4f5751;--paper: #f6f6f1;--surface: #ffffff;--line: #dfe2da;--acid: #d9ff57;--acid-deep: #a8d80f;--mint: #c5f3df;--sky: #d8eaff;--coral: #ffb79f;--yellow: #ffe582;--shadow: 0 18px 55px rgba(21, 24, 22, .08);--radius: 22px;--font: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--font);line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img,svg{max-width:100%;height:auto}button,input{font:inherit}::selection{background:var(--acid);color:var(--ink)}.shell{width:min(1180px,calc(100% - 40px));margin-inline:auto}.narrow{width:min(860px,calc(100% - 40px))}.skip-link{position:fixed;top:-100px;left:16px;z-index:100;padding:8px 14px;background:var(--ink);color:#fff;border-radius:8px}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(223,226,218,.85);background:#f6f6f1e6;backdrop-filter:blur(18px)}.nav-shell{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:650;letter-spacing:-.02em}.brand b{font-weight:800}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;color:var(--acid);background:var(--ink);font-size:19px;font-weight:900;transform:rotate(-3deg)}.site-nav{display:flex;align-items:center;gap:4px}.site-nav a{padding:8px 13px;color:var(--ink-soft);border-radius:10px;font-size:14px;font-weight:650}.site-nav a:hover,.site-nav a.active{color:var(--ink);background:#fff}.site-nav a.active{box-shadow:inset 0 -2px var(--acid-deep)}.search-link{margin-left:8px;border:1px solid var(--line)}.nav-toggle{display:none;border:1px solid var(--line);background:#fff;padding:7px 11px;border-radius:9px}.hero{padding:86px 0 58px;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;align-items:center;gap:64px}.kicker,.section-kicker,.quiz-kicker{color:#637914;text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:850}.kicker{display:inline-flex;align-items:center;gap:9px;padding:7px 12px;border:1px solid #cfe872;border-radius:99px;background:#efffc0}.kicker:before{content:"";width:7px;height:7px;border-radius:50%;background:#83a500;box-shadow:0 0 0 4px #83a50026}.hero h1{max-width:720px;margin:22px 0 20px;font-size:clamp(48px,6.2vw,84px);line-height:.99;letter-spacing:-.065em}.highlight{position:relative;white-space:nowrap}.highlight:after{content:"";position:absolute;height:.2em;left:0;right:0;bottom:.08em;z-index:-1;background:var(--acid);transform:rotate(-1.5deg)}.hero-copy>p{max-width:620px;color:var(--ink-soft);font-size:18px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 24px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border-radius:12px;font-weight:800;background:var(--ink);color:#fff;box-shadow:0 8px 20px #15181626;transition:transform .2s,box-shadow .2s}.button:hover{transform:translateY(-2px);box-shadow:0 12px 26px #15181633}.button.acid{background:var(--acid);color:var(--ink)}.button.ghost{color:var(--ink);background:transparent;border:1px solid #cfd2cb;box-shadow:none}.hero-proof{display:flex;flex-wrap:wrap;gap:18px;color:var(--ink-soft);font-size:13px}.hero-proof span:before{content:"✓";margin-right:6px;color:#6f8c00;font-weight:900}.hero-visual{position:relative;min-height:500px}.visual-board{position:absolute;inset:22px 0 0 22px;overflow:hidden;padding:30px;border:1px solid var(--ink);border-radius:30px;background:#fff;box-shadow:14px 14px 0 var(--ink);transform:rotate(1.8deg)}.visual-board img{width:100%;height:100%;object-fit:contain}.floating-note{position:absolute;z-index:2;padding:12px 16px;border:1px solid var(--ink);border-radius:13px;background:var(--yellow);font-weight:800;box-shadow:5px 5px 0 var(--ink)}.floating-note.one{right:-10px;top:7px;transform:rotate(5deg)}.floating-note.two{left:-12px;bottom:18px;background:var(--mint);transform:rotate(-4deg)}.stats-bar{border-block:1px solid var(--line);background:#fff}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}.stat{padding:25px 28px;border-right:1px solid var(--line)}.stat:first-child{border-left:1px solid var(--line)}.stat strong{display:block;font-size:25px;line-height:1.2;letter-spacing:-.04em}.stat span{color:var(--ink-soft);font-size:13px}.section{padding:90px 0}.section.alt{background:#eceee7}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:34px}.section-head h2,.content-hero h1{margin:8px 0 0;font-size:clamp(34px,4.2vw,58px);line-height:1.08;letter-spacing:-.05em}.section-head p{max-width:500px;color:var(--ink-soft)}.lesson-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.lesson-card{min-height:330px;display:flex;flex-direction:column;justify-content:space-between;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:transform .2s,box-shadow .2s,border-color .2s}.lesson-card:hover{transform:translateY(-5px);border-color:var(--ink);box-shadow:var(--shadow)}.lesson-card.planned{background:#f1f2ed;color:#666d68}.lesson-top{display:flex;justify-content:space-between;align-items:start}.lesson-number{color:#747b76;font-family:ui-monospace,monospace;font-size:13px}.lesson-icon{display:grid;place-items:center;width:45px;height:45px;border-radius:50%;background:var(--acid);color:var(--ink);font-size:23px;font-weight:900}.lesson-card:nth-child(2n) .lesson-icon{background:var(--sky)}.lesson-card:nth-child(3n) .lesson-icon{background:var(--mint)}.lesson-card:nth-child(4n) .lesson-icon{background:var(--coral)}.eyebrow-row{display:flex;gap:11px;margin-bottom:8px;color:#6b736d;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.07em}.eyebrow-row span+span:before{content:"·";margin-right:11px}.lesson-card h3{margin:0 0 8px;font-size:23px;letter-spacing:-.035em}.lesson-card p{margin:0;color:var(--ink-soft);font-size:14px}.card-action{margin-top:22px;font-size:13px;font-weight:850}.pathway{display:grid;grid-template-columns:1fr 1fr;gap:18px}.path-card{position:relative;overflow:hidden;min-height:420px;padding:40px;border-radius:28px;border:1px solid var(--ink)}.path-card.ml{background:var(--acid)}.path-card.agent{background:var(--ink);color:#fff}.path-card h3{margin:20px 0 12px;font-size:40px;letter-spacing:-.05em}.path-card p{max-width:440px;opacity:.76}.path-card .path-tag{display:inline-block;padding:7px 11px;border:1px solid currentColor;border-radius:99px;font-size:12px;font-weight:800}.path-card ul{display:grid;grid-template-columns:1fr 1fr;gap:7px 24px;margin:30px 0;padding:0;list-style:none;font-size:14px}.path-card li:before{content:"→";margin-right:7px}.lock-pill{display:inline-flex;gap:8px;align-items:center;padding:9px 12px;border-radius:10px;background:#ffffff1a;color:var(--acid);font-size:13px;font-weight:800}.workflow{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;counter-reset:step}.workflow article{position:relative;min-height:210px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px;counter-increment:step}.workflow article:before{content:"0" counter(step);display:block;margin-bottom:42px;color:#809015;font-family:ui-monospace,monospace;font-size:12px}.workflow h3{margin:0 0 6px;font-size:18px}.workflow p{margin:0;color:var(--ink-soft);font-size:13px}.workflow article:not(:last-child):after{content:"→";position:absolute;top:50%;right:-18px;z-index:2;display:grid;place-items:center;width:24px;height:24px;border:1px solid var(--line);border-radius:50%;background:var(--paper);font-size:12px}.cta{padding:85px 0}.cta-box{display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px;padding:48px;border-radius:28px;background:var(--ink);color:#fff}.cta-box h2{margin:0 0 8px;font-size:clamp(30px,4vw,48px);letter-spacing:-.05em}.cta-box p{margin:0;color:#bbc1bd}.content-hero{padding:76px 0 50px}.content-hero p{max-width:680px;color:var(--ink-soft);font-size:18px}.breadcrumbs{margin-bottom:22px;color:#727a74;font-size:13px}.breadcrumbs a:hover{text-decoration:underline}.lesson-hero{padding:68px 0 52px}.back-link{color:#667411;font-size:14px;font-weight:800}.lesson-meta{display:flex;flex-wrap:wrap;gap:10px;margin:30px 0 12px}.lesson-meta span{padding:4px 9px;border:1px solid var(--line);border-radius:99px;background:#fff;color:var(--ink-soft);font-size:12px}.lesson-hero h1{margin:0;font-size:clamp(46px,7vw,76px);line-height:1.03;letter-spacing:-.06em}.lesson-hero>p{max-width:720px;color:var(--ink-soft);font-size:20px}.objectives{margin-top:28px;padding:22px 26px;border-left:4px solid var(--acid-deep);border-radius:0 14px 14px 0;background:#fff}.objectives ul{margin:8px 0 0;padding-left:20px}.article-shell{display:grid;grid-template-columns:210px minmax(0,760px);justify-content:center;gap:60px;padding-bottom:90px}.article-aside{position:relative}.aside-card{position:sticky;top:100px;display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid var(--line);border-radius:16px;background:#fff;font-size:13px}.aside-card b{margin-bottom:7px}.aside-card a{color:var(--ink-soft)}.aside-card a:hover{color:var(--ink)}.article-body{min-width:0;padding:8px 0 30px;font-size:17px}.article-body h2{margin:60px 0 16px;padding-top:5px;font-size:32px;line-height:1.2;letter-spacing:-.04em}.article-body h3{margin:38px 0 10px;font-size:23px;letter-spacing:-.025em}.article-body p,.article-body li{color:#343a36}.article-body strong{color:var(--ink)}.article-body a{color:#536900;text-decoration:underline;text-underline-offset:3px}.article-body img{width:100%;margin:24px 0;border:1px solid var(--line);border-radius:20px;background:#fff}.article-body blockquote{margin:28px 0;padding:20px 24px;border-left:4px solid var(--acid-deep);background:#f0f4e2;border-radius:0 14px 14px 0}.article-body blockquote p{margin:0}.formula{overflow-x:auto;margin:26px 0;padding:24px;border-radius:16px;background:var(--ink);color:#fff;text-align:center;font:600 20px/1.5 Georgia,serif}.term-box,.example-box,.warning-box{margin:28px 0;padding:22px 24px;border:1px solid var(--line);border-radius:16px;background:#fff}.term-box{border-top:5px solid var(--sky)}.example-box{border-top:5px solid var(--mint)}.warning-box{border-top:5px solid var(--coral)}.term-box h3,.example-box h3,.warning-box h3{margin-top:0}pre{overflow-x:auto;margin:26px 0;padding:22px;border:1px solid #353a36;border-radius:16px;background:#171a18;color:#eef7ef;font:14px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;tab-size:2}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}:not(pre)>code{padding:2px 6px;border-radius:5px;background:#e8eadf;color:#445200;font-size:.88em}.data-table{width:100%;border-collapse:collapse;margin:24px 0;background:#fff;font-size:14px}.data-table th,.data-table td{padding:12px 14px;border:1px solid var(--line);text-align:left}.data-table th{background:#ecefe6}.quiz{margin:50px 0;padding:28px;border:2px solid var(--ink);border-radius:20px;background:#fff;box-shadow:8px 8px 0 var(--acid)}.quiz h2{margin:6px 0 18px;padding:0;font-size:22px}.quiz-options{display:grid;gap:9px}.quiz-options button{padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--paper);color:var(--ink);text-align:left;cursor:pointer}.quiz-options button:hover:not(:disabled){border-color:var(--ink)}.quiz-options button.correct{border-color:#1c8653;background:#dcf7e9}.quiz-options button.wrong{border-color:#c95535;background:#ffe3d9}.quiz-result{margin-bottom:0;padding:12px;border-radius:8px;background:#f0f2e9}.lesson-pagination{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:70px;padding-top:25px;border-top:1px solid var(--line)}.lesson-pagination a{padding:16px;border:1px solid var(--line);border-radius:13px;background:#fff;text-decoration:none}.lesson-pagination a:hover{border-color:var(--ink)}.lesson-pagination span{display:block;color:var(--ink-soft);font-size:11px}.lesson-pagination .next{text-align:right}.glossary-list{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding-bottom:90px}.glossary-item{padding:24px;border:1px solid var(--line);border-radius:16px;background:#fff}.glossary-item h2{margin:0 0 8px;font-size:19px}.glossary-item p{margin:0;color:var(--ink-soft);font-size:14px}.search-box{display:flex;margin:25px 0 38px;padding:7px;border:1px solid var(--line);border-radius:14px;background:#fff}.search-box input{flex:1;min-width:0;padding:10px 12px;border:0;outline:0;background:transparent}.search-box button{border:0;border-radius:9px;padding:0 18px;background:var(--ink);color:#fff;font-weight:800}.search-results{display:grid;gap:10px;padding-bottom:80px}.search-result{display:block;padding:20px;border:1px solid var(--line);border-radius:14px;background:#fff}.search-result h2{margin:0;font-size:19px}.search-result p{margin:5px 0 0;color:var(--ink-soft);font-size:14px}.empty-state{padding:30px;border:1px dashed #adb3ad;border-radius:14px;text-align:center;color:var(--ink-soft)}.curriculum-preview{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.curriculum-preview>article{padding:25px;border:1px solid var(--line);border-radius:20px;background:#fff}.curriculum-preview>article>span{font-family:ui-monospace,monospace;color:#738114;font-size:12px}.curriculum-preview h3{margin:24px 0 8px;font-size:21px;letter-spacing:-.03em}.curriculum-preview p{min-height:70px;color:var(--ink-soft);font-size:13px}.curriculum-preview ul{margin:20px 0 0;padding:0;border-top:1px solid var(--line);list-style:none}.curriculum-preview li{border-bottom:1px solid var(--line)}.curriculum-preview li a{display:flex;justify-content:space-between;gap:8px;padding:9px 0;font-size:13px;font-weight:700}.curriculum-preview li small{color:var(--ink-soft);font-weight:500;white-space:nowrap}.course-index-hero{padding-bottom:32px}.time-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;overflow:hidden;margin-top:36px;border:1px solid var(--ink);border-radius:20px;background:var(--ink)}.time-summary>div{padding:22px;background:#fff}.time-summary strong{display:block;font-size:25px;line-height:1.2;letter-spacing:-.04em}.time-summary span{display:block;margin-top:6px;color:var(--ink-soft);font-size:12px}.time-calculation{display:flex;align-items:center;gap:18px;margin-top:14px;padding:15px 18px;border:1px solid #c7df74;border-radius:13px;background:#efffc0;font-size:14px}.time-calculation b{flex:0 0 auto;padding:4px 8px;border-radius:6px;background:var(--ink);color:var(--acid);font-size:11px}.course-catalog{padding:40px 0 100px}.catalog-group{padding:42px 0;border-top:1px solid var(--line);scroll-margin-top:90px}.catalog-group>header{display:grid;grid-template-columns:60px 1fr;gap:20px;margin-bottom:26px}.catalog-group>header>span{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:var(--ink);color:var(--acid);font:800 14px ui-monospace,monospace}.catalog-group h2{margin:0;font-size:34px;letter-spacing:-.04em}.catalog-group header p{margin:4px 0 0;color:var(--ink-soft)}.catalog-modules{display:grid;gap:10px;margin-left:80px}.catalog-module{display:grid;grid-template-columns:54px minmax(0,1fr) 120px;gap:20px;align-items:center;padding:23px;border:1px solid var(--line);border-radius:17px;background:#fff;transition:transform .2s,border-color .2s,box-shadow .2s}.catalog-module:hover{transform:translateY(-2px);border-color:var(--ink);box-shadow:0 12px 32px #15181614}.catalog-order{color:#778077;font:700 12px ui-monospace,monospace}.catalog-module h3{margin:0;font-size:21px;letter-spacing:-.03em}.catalog-module p{margin:5px 0 10px;color:var(--ink-soft);font-size:13px}.topic-chips{display:flex;flex-wrap:wrap;gap:5px}.topic-chips span{padding:3px 7px;border-radius:6px;background:#eef0e9;color:#5e665f;font-size:10px}.catalog-time{text-align:right}.catalog-time strong,.catalog-time small{display:block}.catalog-time strong{font-size:14px}.catalog-time small{color:var(--ink-soft);font-size:10px}.catalog-time i{display:inline-block;margin-top:12px;font-size:19px;font-style:normal}.course-reader{display:grid;grid-template-columns:292px minmax(0,1fr);min-height:calc(100vh - 72px)}.course-sidebar{border-right:1px solid var(--line);background:#eceee7}.course-sidebar-inner{position:sticky;top:72px;overflow-y:auto;max-height:calc(100vh - 72px);padding:24px 18px 35px;scrollbar-width:thin}.sidebar-home{display:block;margin-bottom:24px;padding:9px 11px;border:1px solid #ced2c9;border-radius:9px;background:#fff;color:var(--ink-soft);font-size:12px;font-weight:750}.sidebar-group{margin:0 0 21px}.sidebar-group h2{margin:0 0 7px;padding:0 9px;color:#777e78;font-size:10px;letter-spacing:.09em;text-transform:uppercase}.sidebar-modules{display:grid;gap:2px}.sidebar-modules a{display:flex;justify-content:space-between;gap:8px;padding:8px 9px;border-radius:8px;color:#424943;font-size:12px}.sidebar-modules a:hover{background:#ffffffb3}.sidebar-modules a.active{background:var(--ink);color:#fff}.sidebar-modules small{color:#858c86;white-space:nowrap}.sidebar-modules a.active small{color:var(--acid)}.module-page{width:min(850px,calc(100% - 60px));margin:0 auto;padding:64px 0 90px}.module-hero{padding-bottom:42px;border-bottom:1px solid var(--line)}.module-group-label{display:inline-block;margin-top:8px;color:#667614;font-size:12px;font-weight:850;letter-spacing:.08em}.module-hero h1{margin:12px 0 16px;font-size:clamp(46px,6vw,72px);line-height:1.02;letter-spacing:-.06em}.module-hero>p{max-width:700px;color:var(--ink-soft);font-size:18px}.module-time-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:25px 0}.module-time-row strong{padding:8px 12px;border-radius:9px;background:var(--acid);font-size:14px}.module-time-row span{padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink-soft);font-size:11px}.module-hero .objectives{margin-top:26px}.section-jump{display:grid;margin:32px 0 55px;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff}.section-jump>strong{margin-bottom:10px;font-size:13px}.section-jump a{display:grid;grid-template-columns:32px 1fr auto;gap:8px;align-items:center;padding:9px 0;border-top:1px solid #eceee7;color:#303632;font-size:13px}.section-jump a>span{color:#8a918b;font:11px ui-monospace,monospace}.section-jump a>small{color:#788078}.learning-section{padding:14px 0 64px;scroll-margin-top:96px;border-bottom:1px solid var(--line)}.learning-section+.learning-section{padding-top:58px}.learning-section-heading{display:grid;grid-template-columns:52px 1fr;gap:14px;align-items:start}.learning-section-heading>span{display:grid;place-items:center;width:43px;height:43px;border-radius:13px;background:var(--ink);color:var(--acid);font:800 12px ui-monospace,monospace;transform:rotate(-2deg)}.learning-section-heading small{color:#778078;font-size:11px}.learning-section h2{margin:2px 0 0;font-size:33px;line-height:1.15;letter-spacing:-.04em}.section-lead{margin:23px 0;color:#383f3a;font-size:18px;line-height:1.85}.key-points{margin:25px 0;padding:24px 26px;border:1px solid var(--line);border-radius:16px;background:#fff}.key-points h3{margin:0 0 12px;font-size:14px}.key-points ul{margin:0;padding-left:20px}.key-points li{margin:7px 0;color:#414842}.concept-example{display:grid;grid-template-columns:55px 1fr;gap:15px;align-items:start;margin-top:20px;padding:19px;border-left:4px solid var(--acid-deep);border-radius:0 13px 13px 0;background:#f0f4e2}.concept-example>span{padding:3px 7px;border-radius:6px;background:var(--ink);color:var(--acid);text-align:center;font-size:10px;font-weight:800}.concept-example p{margin:0;color:#3c443d}.worked-case{margin:58px 0 0;padding:clamp(22px,4vw,42px);border:1px solid #cad7a1;border-radius:24px;background:#f7faef}.worked-case-label{display:inline-block;padding:5px 10px;border-radius:7px;background:var(--ink);color:var(--acid);font-size:11px;font-weight:800}.worked-case h2{margin:16px 0 10px;font-size:clamp(26px,3vw,38px);line-height:1.2;letter-spacing:-.04em}.worked-case-context{color:var(--ink-soft);font-size:16px}.worked-case ol{margin:30px 0 0;padding-left:27px}.worked-case li{margin:0 0 24px;padding:0 0 25px 10px;border-bottom:1px solid #dfe7cf}.worked-case li::marker{color:#587000;font-weight:800}.worked-case h3{margin:0 0 5px;font-size:18px}.worked-case li p{margin:0;color:#424a43}.worked-calculation{margin-top:12px;padding:12px 15px;overflow-x:auto;border:1px solid #dce6c8;border-radius:9px;background:#fff;font-family:ui-monospace,monospace;font-size:13px}.worked-code{margin-top:26px}.worked-code>strong{font-size:14px}.worked-code pre{margin:10px 0 0;padding:20px;overflow-x:auto;border-radius:13px;background:var(--ink);color:#e9f0e8;font-size:12px;line-height:1.65}.worked-takeaway{margin:26px 0 0;padding:17px 20px;border-left:4px solid var(--acid-deep);background:#eaf4d1}.source-note{margin:55px 0 15px;padding:22px;border:1px solid var(--line);border-radius:15px;background:#fff;color:var(--ink-soft);font-size:12px}.source-note strong{color:var(--ink)}.source-note p{margin:7px 0 0}.source-note a{color:#587000;text-decoration:underline}.deep-module-page{width:min(940px,calc(100% - 60px))}.deep-hero>p{max-width:820px;font-size:19px;line-height:1.9}.learning-route{display:grid;grid-template-columns:repeat(7,auto);align-items:center;gap:10px;margin:30px 0 6px;padding:18px;border-radius:18px;background:var(--ink);color:#fff}.learning-route div{min-width:0}.learning-route b,.learning-route span{display:block}.learning-route b{color:var(--acid);font-size:12px}.learning-route span{margin-top:2px;color:#e6e9e6;font-size:12px;white-space:nowrap}.learning-route i{color:#778078;font-style:normal}.deep-toc{grid-template-columns:1fr 1fr;gap:0 26px}.deep-toc>strong{grid-column:1 / -1}.deep-content h3{margin:42px 0 13px;font-size:23px;line-height:1.35;letter-spacing:-.025em}.deep-content p,.deep-content li{color:#343a36}.deep-content p{margin:13px 0}.deep-content strong,.deep-content b{color:var(--ink)}.chapter{padding-bottom:82px}.chapter+.chapter{padding-top:76px}.teaching-figure{margin:28px 0}.figure-scroll-hint{display:none}.teaching-figure img{display:block;width:100%;border:1px solid var(--line);border-radius:22px;background:#fff}.teaching-figure figcaption{margin-top:10px;color:#707872;font-size:12px;text-align:center}.dark-figure img{border-color:#313632;background:var(--ink)}.plain-language,.warning-note{margin:28px 0;padding:21px 24px;border-radius:0 15px 15px 0}.plain-language{border-left:5px solid var(--acid-deep);background:#f0f4e2}.warning-note{border-left:5px solid #e7896a;background:#fff0ea}.plain-language b,.warning-note b{display:block;margin-bottom:5px}.plain-language p,.warning-note p{margin:0}.formula-large{padding:31px;font-size:30px}.definition-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:26px 0}.definition-grid article{min-height:166px;padding:20px;border:1px solid var(--line);border-radius:16px;background:#fff}.definition-grid article:nth-child(3n+1){border-top:5px solid var(--acid)}.definition-grid article:nth-child(3n+2){border-top:5px solid var(--sky)}.definition-grid article:nth-child(3n){border-top:5px solid var(--mint)}.definition-grid code{display:inline-block;margin-bottom:13px;padding:3px 8px;border-radius:7px;background:var(--ink);color:var(--acid);font-size:15px}.definition-grid h4{margin:0 0 5px;font-size:16px}.definition-grid p{margin:0;color:var(--ink-soft);font-size:13px;line-height:1.6}.definition-grid.three{grid-template-columns:repeat(3,1fr)}.calculation{display:flex;align-items:stretch;gap:12px;margin:26px 0}.calculation>div{flex:1;padding:18px;border:1px solid var(--line);border-radius:14px;background:#fff}.calculation>i{align-self:center;color:#8b938d;font-style:normal}.calculation span,.calculation b{display:block}.calculation span{margin-bottom:5px;color:var(--ink-soft);font-size:11px}.calculation b{font-size:15px}.calculation .result{border-color:#b8d94b;background:#efffc0}.calculation.two-line{display:grid;grid-template-columns:1fr 1fr}.meaning-list{margin:22px 0;padding-left:22px}.meaning-list li{margin:10px 0}.concept-grid{display:grid;gap:10px;margin:24px 0}.concept-grid.four{grid-template-columns:repeat(4,1fr)}.concept-grid article{padding:17px;border:1px solid var(--line);border-radius:13px;background:#fff}.concept-grid b,.concept-grid span{display:block}.concept-grid span{margin-top:3px;color:var(--ink-soft);font-size:12px}.table-scroll{overflow-x:auto;margin:24px 0;border-radius:14px}.table-scroll .data-table{min-width:650px;margin:0}.compact-table td,.compact-table th{padding-block:9px}.loss-table td:nth-child(2){white-space:nowrap;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.compare-cards,.decision-grid,.parameter-compare{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0}.compare-cards article,.decision-grid article,.parameter-compare article{padding:23px;border:1px solid var(--line);border-radius:17px;background:#fff}.compare-cards article:first-child{border-top:5px solid var(--mint)}.compare-cards article:last-child{border-top:5px solid var(--coral)}.compare-cards span,.parameter-compare span{display:inline-block;padding:3px 8px;border-radius:99px;background:var(--ink);color:var(--acid);font-size:10px;font-weight:800}.compare-cards h4{margin:13px 0 3px}.compare-cards p{margin:0;font-size:20px}.compare-cards small{color:var(--ink-soft)}.decision-grid article:first-child{background:#f2fbf7}.decision-grid article:last-child{background:#fff5f1}.decision-grid ul{margin-bottom:0;padding-left:20px}.number-steps{margin:24px 0;padding:22px 22px 22px 48px;border:1px solid var(--line);border-radius:16px;background:#fff}.number-steps li{margin:9px 0;padding-left:5px}.formula-stack{display:grid;grid-template-columns:1fr 1fr;gap:1px;overflow:hidden;margin:25px 0;border:1px solid var(--ink);border-radius:17px;background:var(--ink)}.formula-stack div{padding:19px;background:#fff}.formula-stack small,.formula-stack b{display:block}.formula-stack small{margin-bottom:5px;color:var(--ink-soft);font-size:11px}.formula-stack b{font:600 17px/1.5 Georgia,serif}.curve-reading{display:grid;grid-template-columns:repeat(3,1fr);gap:11px;margin:25px 0}.curve-reading article{padding:18px;border:1px solid var(--line);border-radius:15px;background:#fff}.curve-reading b,.curve-reading span{display:block}.curve-reading span{margin-top:5px;color:var(--ink-soft);font-size:12px}.curve{position:relative;display:block;overflow:hidden;height:64px;margin-bottom:14px;border-bottom:1px solid #cfd3cc;border-left:1px solid #cfd3cc}.curve:after{content:"";position:absolute;inset:10px 7px 8px 9px;border:solid;border-width:0 0 4px 0;border-radius:50%;transform:rotate(-12deg)}.curve.good:after{border-color:#7da20b;transform:rotate(-16deg) skew(-30deg)}.curve.slow:after{border-color:#4f78df;transform:rotate(-4deg)}.curve.bad:after{border-color:#df5e3f;border-width:4px 0;transform:rotate(8deg) skewY(-16deg)}.fine-print{padding:16px 18px;border:1px dashed #b7bdb5;border-radius:12px;color:var(--ink-soft)!important;font-size:13px}.parameter-compare article:first-child{border-top:5px solid var(--sky)}.parameter-compare article:last-child{border-top:5px solid var(--acid)}.parameter-compare h3{margin:10px 0 0;font-size:28px}.parameter-compare p{margin:2px 0;font-weight:750}.parameter-compare small{color:var(--ink-soft)}.tuning-steps{display:grid;gap:11px;margin:26px 0;padding:0;list-style:none}.tuning-steps li{display:grid;grid-template-columns:52px 1fr;gap:16px;padding:18px;border:1px solid var(--line);border-radius:15px;background:#fff}.tuning-steps li>span{display:grid;place-items:center;width:42px;height:42px;border-radius:11px;background:var(--ink);color:var(--acid);font:800 11px ui-monospace,monospace}.tuning-steps p{margin:2px 0 0;color:var(--ink-soft);font-size:13px}.summary-box{margin:38px 0 0;padding:29px;border:2px solid var(--ink);border-radius:20px;background:var(--acid);box-shadow:8px 8px 0 var(--ink)}.summary-box span{font-size:11px;font-weight:850;letter-spacing:.08em}.summary-box p{margin:9px 0 0;color:var(--ink);font-size:18px;line-height:1.8}.term-recap{margin:54px 0}.term-recap h2{margin-bottom:18px;font-size:27px}.term-recap dl{display:grid;grid-template-columns:1fr 1fr;gap:1px;overflow:hidden;margin:0;border:1px solid var(--line);border-radius:17px;background:var(--line)}.term-recap dl>div{padding:16px 18px;background:#fff}.term-recap dt{font-weight:800}.term-recap dd{margin:3px 0 0;color:var(--ink-soft);font-size:12px}.rich-source-note p{line-height:1.8}.rich-source-note a+a{margin-left:4px}.timeline{position:relative;max-width:820px;margin:0 auto;padding:10px 0 90px 42px}.timeline:before{content:"";position:absolute;left:13px;top:0;bottom:80px;width:2px;background:var(--line)}.timeline article{position:relative;margin-bottom:20px;padding:26px;border:1px solid var(--line);border-radius:18px;background:#fff}.timeline article:before{content:"";position:absolute;left:-37px;top:31px;width:13px;height:13px;border:5px solid var(--paper);border-radius:50%;background:var(--acid-deep);box-shadow:0 0 0 1px var(--line)}.timeline h2{margin:2px 0 8px;font-size:24px}.timeline p{margin:0;color:var(--ink-soft)}.legal{max-width:800px;padding-bottom:90px}.legal h2{margin-top:38px}.legal p,.legal li{color:var(--ink-soft)}.notice{padding:16px 18px;border:1px solid #e2c869;border-radius:12px;background:#fff7d6}.site-footer{padding:60px 0 22px;border-top:1px solid #2f3431;background:var(--ink);color:#fff}.footer-grid{display:grid;grid-template-columns:1.5fr .7fr .7fr 1fr;gap:50px}.footer-brand .brand-mark{background:var(--acid);color:var(--ink)}.footer-grid h2{margin:0 0 14px;font-size:13px;text-transform:uppercase;letter-spacing:.1em;color:#919a94}.footer-grid a:not(.brand){display:block;margin:7px 0;color:#d0d5d1;font-size:13px}.footer-grid p{max-width:300px;color:#9da59f;font-size:13px}.footer-bottom{display:flex;justify-content:space-between;margin-top:48px;padding-top:20px;border-top:1px solid #333935;color:#7e8781;font-size:12px}.auth-panel,.checkout-panel{margin-bottom:90px;padding:30px;border:1px solid var(--line);border-radius:22px;background:#fff}.auth-panel h2{margin:0 0 20px}.auth-panel>p:last-child{color:var(--ink-soft)}.auth-panel>p:last-child a{color:#536900;text-decoration:underline}.auth-form{display:grid;max-width:510px;gap:18px}.auth-form label{display:grid;gap:6px;font-weight:750}.auth-form input{width:100%;min-height:48px;padding:10px 14px;border:1px solid #bfc6bb;border-radius:10px;background:#fff}.auth-form input:focus{outline:3px solid #d9ff57;border-color:var(--ink)}.auth-form small{margin-top:-12px;color:var(--ink-soft)}.auth-form .button{width:fit-content;border:0;cursor:pointer}.form-error{padding:14px 18px;border:1px solid #d68774;border-radius:12px;background:#fff0e9;color:#8a2d18}.account-course{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 0;border-top:1px solid var(--line)}.account-course strong{font-size:20px}.account-course p{margin:2px 0 0;color:var(--ink-soft)}.text-button{margin-top:28px;padding:0;border:0;background:none;color:#536900;cursor:pointer;text-decoration:underline}.checkout-total{display:flex;justify-content:space-between;gap:20px;align-items:center;padding-bottom:20px;border-bottom:1px solid var(--line);font-size:19px}.checkout-total strong{font-size:32px}.order-number,.order-help{color:var(--ink-soft);font-size:13px;overflow-wrap:anywhere}.demo-payment,.wechat-payment,.checkout-success{padding:28px;margin:25px 0;border-radius:16px;background:#f1f4e9;text-align:center}.demo-payment p,.wechat-payment p{max-width:500px;margin:10px auto 20px;color:var(--ink-soft)}.demo-payment button,.wechat-payment button{border:0;cursor:pointer}.wechat-payment img{display:block;margin:15px auto;border:1px solid var(--line);border-radius:10px;background:#fff}.agent-purchase{display:flex;justify-content:space-between;align-items:center;gap:30px;margin-bottom:40px;padding:28px 34px;border-radius:20px;background:var(--ink);color:#fff}.agent-purchase h2{margin:0 0 6px;font-size:28px}.agent-purchase p{margin:0;color:#c7d0c8}.agent-purchase button{border:0;cursor:pointer;white-space:nowrap}.agent-catalog{padding-top:20px}.agent-catalog .catalog-modules{margin-left:0}.agent-reader .article-body section{scroll-margin-top:90px}.agent-reader .teaching-figure{margin:0 0 42px}.agent-reader .teaching-figure figcaption{color:var(--ink-soft);font-size:13px;text-align:center}.agent-lab{margin-top:68px;padding:30px;border:1px solid #c8db8c;border-radius:22px;background:#f2f6e7}.agent-lab .agent-lab-head span{display:inline-block;margin-bottom:8px;color:#536900;font-size:13px;font-weight:800;letter-spacing:.08em}.agent-lab h2{margin:0 0 14px;padding:0}.agent-lab .button{display:inline-block;margin:8px 0 16px;text-decoration:none}.agent-lab ol{margin:4px 0 18px;padding-left:24px}.agent-lab li{margin:9px 0}.agent-lab code{padding:2px 5px;border-radius:4px;background:#e4ead5;overflow-wrap:anywhere}.agent-lab .agent-lab-note{margin-bottom:0;color:var(--ink-soft);font-size:15px}@media(max-width:980px){.hero-grid{grid-template-columns:1fr}.hero-visual{min-height:420px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.workflow{grid-template-columns:1fr 1fr}.workflow article:not(:last-child):after{display:none}.article-shell{grid-template-columns:1fr}.article-aside{display:none}.footer-grid{grid-template-columns:1.5fr 1fr 1fr}.footer-grid>div:last-child{grid-column:1 / -1}.curriculum-preview{grid-template-columns:1fr 1fr}.course-reader{grid-template-columns:minmax(0,1fr)}.course-sidebar{display:none}.module-page{width:min(800px,calc(100% - 40px))}.deep-module-page{width:min(900px,calc(100% - 40px))}}@media(max-width:720px){.auth-panel,.checkout-panel{padding:20px}.account-course,.agent-purchase{align-items:stretch;flex-direction:column}.shell,.narrow{width:min(100% - 28px,1180px)}.nav-toggle{display:block}.site-nav{position:absolute;top:64px;left:14px;right:14px;display:none;flex-direction:column;align-items:stretch;padding:10px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow)}.site-nav.open{display:flex}.search-link{margin-left:0}.hero{padding-top:52px}.hero h1{font-size:50px}.hero-visual{min-height:340px}.visual-board{inset:20px 8px 0;padding:18px}.floating-note{font-size:12px}.stats-grid{grid-template-columns:1fr 1fr}.stat:nth-child(3){border-left:1px solid var(--line)}.stat:nth-child(-n+2){border-bottom:1px solid var(--line)}.section{padding:65px 0}.section-head{align-items:start;flex-direction:column}.lesson-grid,.pathway,.glossary-list{grid-template-columns:1fr}.lesson-card{min-height:285px}.path-card{min-height:390px;padding:28px}.path-card h3{font-size:34px}.workflow{grid-template-columns:1fr}.cta-box{grid-template-columns:1fr;padding:30px}.lesson-hero h1{font-size:48px}.article-body{font-size:16px}.lesson-pagination{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child,.footer-grid>div:last-child{grid-column:1 / -1}.footer-bottom{flex-direction:column;gap:5px}.curriculum-preview{grid-template-columns:1fr}.curriculum-preview p{min-height:0}.time-summary{grid-template-columns:1fr 1fr}.time-calculation{align-items:flex-start;flex-direction:column;gap:8px}.catalog-group>header{grid-template-columns:48px 1fr;gap:12px}.catalog-group h2{font-size:28px}.catalog-modules{margin-left:0}.catalog-module{grid-template-columns:36px 1fr;padding:18px}.catalog-time{grid-column:2;display:flex;gap:8px;align-items:center;text-align:left}.catalog-time strong,.catalog-time small{display:inline}.catalog-time i{margin:0 0 0 auto}.module-page{width:calc(100vw - 28px);max-width:800px;min-width:0;padding-top:42px}.module-hero h1{font-size:48px}.section-jump{padding:16px}.section-jump a{grid-template-columns:26px 1fr}.section-jump a small{display:none}.learning-section-heading{grid-template-columns:44px 1fr;gap:9px}.learning-section h2{font-size:28px}.section-lead{font-size:16px}.learning-route{grid-template-columns:1fr 1fr}.learning-route i{display:none}.learning-route div{padding:9px;border:1px solid #39403b;border-radius:10px}.learning-route span{white-space:normal}.deep-toc,.definition-grid,.definition-grid.three,.concept-grid.four,.curve-reading{grid-template-columns:1fr}.definition-grid article{min-height:0}.calculation{flex-direction:column}.calculation>i{transform:rotate(90deg)}.calculation.two-line,.compare-cards,.decision-grid,.parameter-compare,.formula-stack,.term-recap dl{grid-template-columns:1fr}.teaching-figure{margin-inline:-7px;overflow-x:auto}.teaching-figure img{min-width:680px}.figure-scroll-hint{display:block;margin:0 0 8px;color:var(--ink-soft);font-size:12px;text-align:right}.formula-large{font-size:24px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}
