@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{--bg:#f5f5f0;--paper:#fff;--ink:#242d29;--muted:#7b827b;--line:#e1e4dc;--accent:#e8613b;--light-accent:#fff0e9;--green:#344a40;--sidebar:232px;--mono:'Space Grotesk',monospace;--font:'Noto Sans SC','Microsoft YaHei',sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.7 var(--font);-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.5}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #e8613b80;outline-offset:4px}button{background:none;border:0}h1,h2,h3,h4,p{margin:0}h1,h2,h3{line-height:1.4}::selection{background:#ffd6c5}.sidebar{position:fixed;z-index:40;inset:0 auto 0 0;width:var(--sidebar);background:#fafaf7;border-right:1px solid var(--line);padding:32px 22px 20px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px}.brand-mark{width:39px;height:42px;background:var(--accent);border-radius:10px 10px 10px 2px;font:700 36px/.9 var(--mono);color:white;padding:3px 8px}.brand>span:last-child{font:600 23px/1.2 var(--mono);letter-spacing:-1px}.brand b{font:600 17px var(--font);letter-spacing:0}.brand small{display:block;font:500 7px/2.8 var(--mono);letter-spacing:1.4px}.side-caption{font-size:10px;color:#999e96;margin:27px 0 13px 13px}.sidebar nav{display:flex;flex-direction:column;gap:7px}.sidebar nav a{display:flex;align-items:center;gap:12px;border-radius:7px;min-height:45px;padding:9px 13px;color:#687268;font-size:13px;font-weight:500;transition:.2s}.sidebar nav a:hover{background:#eeeee8}.sidebar nav a.active{background:#e9ece4;color:#263e2f}.nav-icon{font-family:var(--mono);font-size:20px;display:inline-flex;justify-content:center;width:19px;line-height:1}.nav-count{margin-left:auto;font:11px var(--mono);border:1px solid #ced4c7;border-radius:4px;padding:2px 5px}.dot{width:5px;height:5px;background:var(--accent);border-radius:50%;margin-left:auto}.side-path{margin:42px 11px 10px;font-size:10px;color:#939b91}.tiny-label{font:10px var(--mono);letter-spacing:1.9px}.side-path>div{margin:18px 0;display:flex;align-items:center;gap:9px}.side-path i{height:5px;width:5px;border-radius:50%;border:1px solid #aab4a7;position:relative}.side-path>div:not(:last-child) i:after{content:'';height:24px;width:1px;background:#d5dbd1;position:absolute;top:5px;left:1px}.side-bottom{margin-top:auto;padding:20px 5px 0}.progress-heading{display:flex;justify-content:space-between;font-size:10px}.progress-heading b{font:11px var(--mono);font-weight:500}.progress-track{height:4px;border-radius:2px;background:#e3e7de;margin:10px 0 15px;overflow:hidden}.progress-track div{height:100%;background:var(--accent);transition:width .3s}.side-export{display:flex;justify-content:space-between;width:100%;font-size:10px;color:#858e82;padding:0}.side-bottom p{font-size:8px;line-height:1.8;color:#a3aaa0;margin-top:22px}.app-shell{margin-left:var(--sidebar)}.topbar{height:73px;border-bottom:1px solid var(--line);padding:0 43px;display:flex;align-items:center;justify-content:space-between;background:var(--bg);position:relative;z-index:20}.top-left,.top-right{display:flex;align-items:center;gap:24px}.breadcrumb{font-size:11px;color:#7b8278}.breadcrumb span{color:#c5cbbf;margin:0 13px}.search-trigger{display:flex;align-items:center;gap:9px;font-size:11px;color:#939a8d;padding:5px}.search-trigger>span:first-child{font-size:22px}.search-trigger kbd{font:9px var(--mono);border:1px solid #dce0d5;border-radius:3px;padding:2px 5px;margin-left:15px}.official-link{font-size:11px}.avatar{background:#e6eadd;border-radius:50%;font-size:12px;color:#5f715a;display:grid;place-items:center;width:30px;height:30px}.mobile-menu{display:none}.icon-button{font-size:18px;padding:5px}main{max-width:1450px;margin:auto;padding:38px 43px 65px;min-height:calc(100vh - 150px)}.eyebrow{font:500 10px var(--mono);letter-spacing:2px;color:var(--accent);text-transform:uppercase;display:flex;align-items:center;gap:9px;margin-bottom:17px}.eyebrow:before{content:'';width:19px;height:1px;background:currentColor}.hero{display:grid;grid-template-columns:1.12fr 1fr;gap:30px;align-items:stretch}.hero-copy{padding:30px 0 17px}.hero h1{font-size:clamp(36px,4.25vw,69px);line-height:1.23;font-weight:700;letter-spacing:-2px;margin:21px 0 24px}.hero h1 em{font-style:normal;color:var(--accent);position:relative}.hero-copy>p{color:#858b80;font-size:12px;line-height:2.1;max-width:360px}.hero-actions{display:flex;gap:20px;align-items:center;margin-top:30px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:22px;font-size:12px;padding:12px 20px;border-radius:5px;font-weight:500;transition:transform .2s,background .2s}.btn:hover{transform:translateY(-2px)}.btn.primary{color:white;background:var(--accent)}.btn.primary:hover{background:#d9512c}.btn.secondary{border:1px solid #d6dccf;background:#fff}.text-link{display:inline-flex;align-items:center;gap:10px;font-size:11px;border-bottom:1px solid #cbd1c3;padding:7px 0}.hero-stats{display:flex;gap:0;margin-top:37px}.hero-stats>span{border-right:1px solid #dbe0d3;padding:0 20px;font-size:10px;color:#8c9385;display:flex;gap:8px;align-items:baseline}.hero-stats>span:first-child{padding-left:0}.hero-stats>span:last-child{border:0}.hero-stats b{font:500 23px var(--mono);color:#414d3e}.hero-visual{position:relative;background:#e5e9df;border-radius:9px;overflow:hidden;min-height:411px;isolation:isolate;background-image:radial-gradient(#bdc6b3 0.65px,transparent 0.65px);background-size:19px 19px}.hero-visual:before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 45% 40%,#f9faf2a0 0,transparent 65%);z-index:-1}.visual-top{position:absolute;left:21px;right:21px;top:17px;display:flex;justify-content:space-between;align-items:center;font:9px var(--mono);color:#7c8871;letter-spacing:1px;z-index:2}.visual-top>span:first-child{display:flex;align-items:center;gap:7px}.live-dot{width:5px;height:5px;border-radius:50%;background:#829b70;box-shadow:0 0 0 3px #829b701a}.hero-visual canvas{display:block;width:100%;height:100%;position:absolute;inset:0;cursor:grab}.visual-bottom{position:absolute;bottom:19px;left:21px;right:21px;display:flex;align-items:end;justify-content:space-between;color:#77836b;font:9px/1.8 var(--mono);pointer-events:none}.visual-bottom b{font-weight:500;color:#4e6045}.visual-tag{position:absolute;right:20px;top:100px;font-size:9px;background:#ffffffb0;border:1px solid #ffffffc0;backdrop-filter:blur(8px);border-radius:4px;padding:7px 11px;z-index:2;color:#65725b}.visual-control{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);padding:3px 9px;border:1px solid #9aa99170;border-radius:20px;font-size:9px;color:#798872;z-index:3}.continue-strip{margin:26px 0 43px;background:#fff;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:5px;display:flex;align-items:center;gap:18px;padding:16px 22px}.continue-strip .continue-icon{font:24px var(--mono);color:#d6a58e}.continue-copy{flex:1}.continue-copy small{font:9px var(--mono);color:#99a18f;letter-spacing:1px}.continue-copy h3{font-size:12px;font-weight:500;margin-top:4px}.continue-strip a{font-size:11px;color:var(--accent)}.section-heading{display:flex;justify-content:space-between;align-items:end;margin:38px 0 20px}.section-heading h2{font-size:23px;font-weight:600;letter-spacing:-.7px}.section-heading p{font-size:10px;color:#909789;margin-top:5px}.section-heading .tiny-label{color:#a3ab98;margin-bottom:7px;display:block}.section-heading>a{font-size:10px;color:#8d9785;margin-bottom:4px}.module-table{border-top:1px solid #d6dccf}.module-row{display:grid;grid-template-columns:48px 1.1fr 1.5fr 75px 23px;gap:15px;align-items:center;border-bottom:1px solid var(--line);padding:20px 8px;transition:.2s}.module-row:hover{background:#edeFE6;padding-left:16px}.module-number{font:400 25px var(--mono);color:#a5af98}.module-title{font-size:14px;font-weight:500}.module-title small{display:block;font:8px/2 var(--mono);letter-spacing:1px;color:#8c9881;margin-top:3px}.module-summary{font-size:10px;line-height:1.9;color:#89937e}.module-meta{font:9px/1.9 var(--mono);color:#9aa18e;text-align:right}.module-arrow{color:#929c87;font-size:18px}.feature-projects{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.project-preview{border:1px solid var(--line);border-radius:6px;overflow:hidden;background:white;transition:transform .2s}.project-preview:hover{transform:translateY(-4px)}.project-art{height:150px;background:#e9ede4;position:relative;overflow:hidden}.project-art canvas{width:100%;height:100%;display:block}.project-art .project-art-tag{position:absolute;left:14px;top:11px;font:8px var(--mono);color:#8b997e;letter-spacing:1px}.project-info{padding:19px}.project-info small{font-size:9px;color:var(--accent)}.project-info h3{font-size:14px;margin:7px 0}.project-info p{font-size:10px;color:#909888;line-height:1.9}.project-info .project-action{font-size:10px;color:#5f7157;display:flex;justify-content:space-between;margin-top:18px}.lower-band{display:flex;justify-content:space-between;align-items:center;background:#e7ebdf;border-radius:6px;padding:23px 27px;margin-top:33px;gap:20px}.lower-band h3{font-size:14px;font-weight:500}.lower-band p{font-size:10px;color:#88927c;margin-top:5px}.footer{max-width:1450px;margin:auto;padding:21px 43px;border-top:1px solid var(--line);font-size:8px;color:#a0a793;display:flex;justify-content:space-between;gap:20px}.footer b{font-weight:500;color:#7e8c73}.page-title{display:flex;justify-content:space-between;align-items:end;gap:20px;margin:18px 0 34px}.page-title h1{font-size:37px;letter-spacing:-1px;margin-bottom:11px;font-weight:600}.page-title p{color:#89917f;max-width:640px;font-size:12px;line-height:1.95}.page-title .eyebrow{margin-bottom:12px}.pill{display:inline-flex;align-items:center;border:1px solid var(--line);color:#89947d;border-radius:20px;padding:5px 11px;font-size:9px;background:#fafbf6}.filters{display:flex;gap:9px;flex-wrap:wrap;margin:22px 0}.filter{border:1px solid var(--line);background:#fafbf6;color:#8a947f;border-radius:5px;padding:7px 15px;font-size:11px}.filter.active{background:var(--green);border-color:var(--green);color:white}.course-module{background:white;border:1px solid var(--line);border-radius:7px;margin-bottom:20px;overflow:hidden}.course-module-head{padding:25px 27px;display:flex;gap:22px;align-items:center;background:#fcfdf9;border-bottom:1px solid var(--line)}.course-module-head .module-number{font-size:32px}.course-module-head h2{font-size:18px}.course-module-head p{font-size:11px;color:#8c9680;margin-top:6px}.course-module-head .pill{margin-left:auto;white-space:nowrap}.lesson-row{display:flex;align-items:center;gap:18px;padding:16px 29px;border-bottom:1px solid #eef0e8;transition:.2s}.lesson-row:last-child{border-bottom:0}.lesson-row:hover{background:#fafbf6}.lesson-check{width:23px;height:23px;border:1px solid #dce2d3;display:grid;place-items:center;border-radius:50%;color:#9aa98d;font:9px var(--mono);flex-shrink:0}.lesson-check.done{color:white;background:#7c9170;border-color:#7c9170}.lesson-row h3{font-size:12px;font-weight:500}.lesson-row p{font-size:10px;color:#a0a792;margin-top:2px}.lesson-row .lesson-time{margin-left:auto;font:10px var(--mono);color:#9da78f;white-space:nowrap}.empty-state{padding:60px;text-align:center;color:#909c83;border:1px dashed #cdd6c3;border-radius:8px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:32px;align-items:start}.lesson-article{background:#fff;border:1px solid var(--line);border-radius:8px;padding:35px 38px}.lesson-article h1{font-size:30px;line-height:1.5;margin:10px 0 20px;letter-spacing:-.6px}.lesson-article .lesson-intro{background:#edf1e6;padding:18px 21px;border-radius:5px;margin:25px 0 30px;font-size:12px;line-height:2;color:#6b7d5b}.lesson-article .lesson-intro b{display:block;color:#4d6240;font-size:10px;margin-bottom:4px}.lesson-article section{margin:28px 0}.lesson-article section h2{font-size:18px;margin-bottom:15px;font-weight:600}.prose{white-space:pre-line;font-size:12px;line-height:2.15;color:#737e68;overflow-wrap:anywhere}.prose strong{font-weight:600;color:#4f6144}.prose code,.formula{font:12px/1.9 var(--mono);color:#57764a;background:#edf2e7;padding:2px 5px;border-radius:3px;overflow-wrap:anywhere}.workflow{display:flex;flex-direction:column;gap:11px;margin:20px 0}.workflow-step{display:flex;gap:14px;align-items:flex-start;border:1px solid #e1e7d9;border-radius:5px;padding:13px 16px;position:relative}.workflow-step:not(:last-child):after{content:'↓';position:absolute;bottom:-15px;left:25px;font-size:12px;color:#a2b192;z-index:2;background:white;line-height:15px}.workflow-step>span{font:10px var(--mono);color:var(--accent);padding-top:3px}.workflow-step b{font-size:11px;font-weight:500;display:block}.workflow-step p{font-size:10px;color:#95a086;margin-top:5px;line-height:1.9}.note-callout{border-left:2px solid #d6c789;background:#fbf9f0;padding:12px 15px;font-size:10px;line-height:1.9;color:#9a906b;margin-bottom:17px}.experiment-box{background:#f0f3e9;padding:22px;border-radius:5px}.experiment-box h3{font-size:13px;margin-bottom:13px;font-weight:500}.steps-list{list-style:none;padding:0;counter-reset:step;margin:0}.steps-list li{counter-increment:step;display:flex;gap:12px;font-size:11px;color:#7e8e6c;margin-bottom:12px;line-height:1.9}.steps-list li:before{content:counter(step,decimal-leading-zero);font:10px/2 var(--mono);color:#b1bb9f;flex-shrink:0}.observe{font-size:11px;line-height:2;padding-top:13px;border-top:1px solid #dbe3cd;color:#687f53;margin-top:12px}.pitfalls{margin:0;padding:0;list-style:none}.pitfalls li{border-bottom:1px solid #edf0e6;padding:10px 0 10px 18px;position:relative;font-size:11px;color:#8c917c;line-height:1.9}.pitfalls li:before{content:'!';position:absolute;left:0;color:#c79b78}.quiz-box{border:1px solid #e2e7da;padding:23px;border-radius:6px}.quiz-box h3{font-size:13px;line-height:1.9;margin-bottom:15px}.quiz-choices{display:flex;flex-direction:column;gap:8px}.quiz-option{text-align:left;border:1px solid #e0e6d7;border-radius:5px;padding:12px 15px;font-size:11px;color:#7a886a;display:flex;gap:12px;line-height:1.8}.quiz-option:hover{background:#f3f6ee}.quiz-option span{font-family:var(--mono);color:#aab69c}.quiz-option.correct{background:#eaf2e0;border-color:#91ac78;color:#55703e}.quiz-option.incorrect{background:#fff0e9;border-color:#e3aa91;color:#ac6c4b}.quiz-feedback{margin-top:14px;padding:12px;background:#f5f6f0;font-size:11px;color:#7d886c;line-height:1.9}.source-links{display:flex;flex-wrap:wrap;gap:8px}.source-links a{font-size:9px;border:1px solid #e1e7d8;padding:5px 9px;border-radius:4px;color:#889879}.lesson-aside{position:sticky;top:25px}.lesson-aside-panel{background:#edf0e6;border:1px solid #e1e6d6;padding:20px;border-radius:6px;margin-bottom:18px}.lesson-aside-panel h3{font-size:12px;margin:8px 0 10px}.lesson-aside-panel p{font-size:10px;line-height:1.9;color:#89967a}.lesson-aside .btn{width:100%;padding:11px;margin-top:13px;font-size:10px;gap:9px}.lesson-toc{display:flex;flex-direction:column;gap:12px;margin-top:18px}.lesson-toc a{font-size:10px;color:#929e82}.lesson-toc a:hover{color:var(--accent)}.note-area label{font-size:11px;display:block;margin-bottom:10px}.note-area textarea{width:100%;min-height:145px;resize:vertical;background:#fffef8;border:1px solid #e6e3ce;border-radius:5px;padding:14px;color:#7a8069;font-size:11px;line-height:1.9}.note-area small{font-size:9px;color:#a3aa94}.lesson-nav{display:flex;justify-content:space-between;gap:15px;margin-top:28px}.lesson-nav a{font-size:11px;color:#7f8f6c;max-width:48%;line-height:1.9}.lesson-nav a:last-child{text-align:right}.back-link{font-size:10px;color:#89997b;display:inline-flex;gap:9px;margin-bottom:22px}.lab-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(235px,.8fr);gap:22px}.lab-stage{background:#e4eadd;border:1px solid #d8e1ce;border-radius:7px;min-height:440px;position:relative;overflow:hidden;background-image:radial-gradient(#b8c6ac .65px,transparent .65px);background-size:21px 21px}.lab-stage canvas{display:block;width:100%;height:440px;cursor:grab}.lab-stage .visual-bottom{bottom:18px}.lab-controls{border:1px solid var(--line);border-radius:6px;background:white;padding:24px}.lab-controls h3{font-size:14px;margin-bottom:20px}.range-group{margin:22px 0}.range-label{display:flex;justify-content:space-between;gap:12px;align-items:baseline;font-size:11px;margin-bottom:12px}.range-label output{font:12px var(--mono);color:var(--accent)}input[type=range]{width:100%;height:4px;accent-color:var(--accent);cursor:pointer;display:block}.range-endpoints{display:flex;justify-content:space-between;font:9px var(--mono);color:#a2ad96;margin-top:10px}.lab-controls p{font-size:10px;line-height:1.9;color:#96a187}.lab-controls .btn{width:100%;margin-top:15px}.lab-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:20px}.fact{padding:15px 20px;background:#fff;border:1px solid var(--line);border-radius:5px}.fact b{font:21px var(--mono);color:#698557;display:block}.fact span{font-size:9px;color:#99a78a}.lab-explanation{margin-top:25px;padding:27px 30px;border:1px solid var(--line);border-radius:6px;background:white}.lab-explanation h2{font-size:18px;margin-bottom:14px}.lab-explanation .prose{font-size:12px}.lab-explanation a{font-size:11px;color:var(--accent);display:inline-block;margin-top:18px}.lab-disclaimer{font-size:9px;color:#98a48a;margin-top:13px;line-height:1.9}.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.project-detail-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:35px;padding:20px 0 30px}.project-detail-hero .project-art{height:270px;border-radius:6px}.project-detail-hero h1{font-size:34px;letter-spacing:-1px;margin:14px 0}.project-detail-hero p{font-size:12px;line-height:2;color:#8c9a7b}.project-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:28px}.project-brief{border:1px solid var(--line);border-radius:6px;padding:26px;background:white;margin-bottom:24px}.project-brief 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