@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

:root{--ink:#11191d;--muted:#5f6b72;--line:#d9e0e4;--soft:#f3f6f7;--blue:#0067e5;--blue2:#0b49a0;--white:#fff;--max:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:'Noto Sans SC',system-ui,sans-serif;background:#fff;line-height:1.7}a{color:inherit;text-decoration:none}button{font:inherit}.site-header{height:80px;display:flex;align-items:center;gap:42px;padding:0 max(28px,calc((100vw - var(--max))/2));border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);position:relative;z-index:20}.brand{display:flex;align-items:center;gap:12px;margin-right:auto}.brand-mark{display:flex;align-items:flex-end;gap:3px;width:29px;height:28px;transform:skewX(-13deg)}.brand-mark i{display:block;background:var(--blue);width:7px}.brand-mark i:nth-child(1){height:12px}.brand-mark i:nth-child(2){height:20px}.brand-mark i:nth-child(3){height:28px}.brand>span:last-child{display:flex;flex-direction:column;line-height:1}.brand b{font:700 15px/1 'Barlow Condensed',sans-serif;letter-spacing:1.5px}.brand small{font:600 10px/1.3 'Barlow Condensed',sans-serif;letter-spacing:2.2px;color:var(--muted)}.site-header nav{display:flex;gap:30px;font-size:14px}.site-header nav a:hover,.back-link:hover{color:var(--blue)}.header-cta{font-size:14px;font-weight:600;color:var(--blue);border-left:1px solid var(--line);padding-left:30px}.header-cta span{margin-left:8px}.hero{min-height:660px;display:grid;grid-template-columns:1fr 1fr;position:relative;border-bottom:1px solid var(--line);overflow:hidden}.hero-grid{position:absolute;inset:0;background-image:linear-gradient(to right,rgba(213,222,227,.38) 1px,transparent 1px),linear-gradient(to bottom,rgba(213,222,227,.38) 1px,transparent 1px);background-size:64px 64px;mask-image:linear-gradient(to right,black,transparent 58%);pointer-events:none}.hero-copy{position:relative;padding:92px 7vw 84px max(28px,calc((100vw - var(--max))/2));align-self:center}.eyebrow{margin:0 0 20px;font:600 13px/1.4 'Barlow Condensed','Noto Sans SC',sans-serif;letter-spacing:1.8px;color:var(--blue);text-transform:uppercase}.hero .eyebrow{display:flex;justify-content:space-between;max-width:570px;border-bottom:1px solid #aebbc2;padding-bottom:10px}.eyebrow em{font-style:normal;color:#758188}.hero h1{font:700 clamp(62px,7vw,108px)/.82 'Barlow Condensed',sans-serif;letter-spacing:-2.5px;text-transform:uppercase;margin:25px 0 24px}.hero h1 span{color:var(--blue)}.hero h1 i{font-style:normal;color:var(--ink)}.hero-cn{font-size:22px;font-weight:600;margin:0 0 16px}.hero-summary{max-width:600px;color:var(--muted);font-size:16px;margin:0;line-height:1.9}.hero-actions{display:flex;align-items:center;gap:22px;margin-top:34px}.button{display:inline-flex;min-height:48px;align-items:center;justify-content:space-between;gap:30px;padding:0 20px;font-size:14px;font-weight:600;border:1px solid var(--ink);transition:.2s}.button.primary{background:var(--ink);color:white}.button.primary:hover{background:var(--blue);border-color:var(--blue)}.button.text{border:0;border-bottom:1px solid var(--ink);padding:0 2px}.hero-instrument{background:var(--soft);border-left:1px solid var(--line);display:flex;flex-direction:column;justify-content:center;padding:70px 6vw 45px 5vw;position:relative}.instrument-top{display:flex;justify-content:space-between;font:600 12px 'Barlow Condensed',sans-serif;letter-spacing:1.7px;margin-bottom:12px}.instrument-top b{color:var(--blue)}.hero-instrument svg{width:100%;border:1px solid var(--line);background:#fff}.track-shadow{fill:none;stroke:#d1d9dd;stroke-width:17;stroke-linecap:round;stroke-linejoin:round}.track-line{fill:none;stroke:var(--blue);stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:7 6}.hero-instrument circle{fill:white;stroke:var(--ink);stroke-width:3}.track-label{font:500 13px 'Noto Sans SC';fill:#344147}.instrument-readout{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-top:0;background:white}.instrument-readout span{padding:17px;border-right:1px solid var(--line)}.instrument-readout span:last-child{border:0}.instrument-readout small{display:block;font:600 10px 'Barlow Condensed';letter-spacing:1.4px;color:var(--muted)}.instrument-readout b{font:600 24px 'Barlow Condensed';color:var(--ink)}.principles{max-width:var(--max);margin:auto;display:grid;grid-template-columns:repeat(4,1fr);border-left:1px solid var(--line)}.principles article{padding:46px 30px 44px;border-right:1px solid var(--line)}.principles article>span{font:600 13px 'Barlow Condensed';color:var(--blue)}.principles h3{font-size:18px;margin:26px 0 8px}.principles p{font-size:14px;color:var(--muted);margin:0;line-height:1.8}.curriculum{background:var(--soft);padding:110px max(28px,calc((100vw - var(--max))/2)) 120px;border-top:1px solid var(--line)}.section-heading{display:grid;grid-template-columns:1.4fr .6fr;gap:80px;align-items:end;margin-bottom:55px}.section-heading h2{font-size:40px;line-height:1.25;margin:0;letter-spacing:-1px}.section-heading>p{color:var(--muted);font-size:14px;margin:0}.module-list{border-top:1px solid var(--ink)}.module{display:grid;grid-template-columns:170px 1fr;border-bottom:1px solid #bfc9ce}.module-meta{padding:35px 28px 35px 0;border-right:1px solid #bfc9ce}.module-number{font:600 52px/1 'Barlow Condensed';color:var(--blue)}.module-meta h3{font-size:16px;margin:15px 0 2px}.module-meta p{font:600 11px 'Barlow Condensed';letter-spacing:1.2px;color:var(--muted);margin:0}.lesson-list{padding:15px 0 15px 34px}.lesson-link{display:grid;grid-template-columns:58px 1fr auto;align-items:center;min-height:78px;padding:9px 18px;border-bottom:1px solid #d7dfe2;transition:.18s}.lesson-link:last-child{border-bottom:0}.lesson-link:hover{background:white;transform:translateX(5px)}.lesson-link .num{font:600 14px 'Barlow Condensed';color:var(--blue)}.lesson-link strong{font-size:17px}.lesson-link small{display:block;color:var(--muted);font-size:13px;font-weight:400;margin-top:2px}.lesson-link .arrow{font-size:20px;color:#7e8b91}.closing{min-height:390px;background:var(--blue);color:white;padding:82px max(28px,calc((100vw - var(--max))/2));display:grid;grid-template-columns:1fr auto;gap:60px;align-items:center;position:relative;overflow:hidden}.closing .eyebrow{color:#9dc7ff}.closing h2{font-size:48px;line-height:1.3;margin:0}.button.light{border-color:white}.button.light:hover{background:white;color:var(--blue)}.closing-line{position:absolute;width:700px;height:200px;border:32px solid rgba(255,255,255,.08);border-radius:50%;right:-150px;top:80px;transform:rotate(-8deg)}footer{max-width:var(--max);min-height:125px;margin:auto;display:flex;align-items:center;gap:35px;color:var(--muted);font-size:13px}footer p{margin-right:auto}.footer-brand{margin-right:0}

/* Article */
.article-header{position:sticky;top:0}.back-link{font-size:14px}.article-shell{max-width:var(--max);margin:auto;display:grid;grid-template-columns:270px minmax(0,760px);gap:90px;padding:54px 0 110px}.article-sidebar{border-right:1px solid var(--line)}.sidebar-sticky{position:sticky;top:120px;padding-right:30px}.article-sidebar .eyebrow{margin-bottom:16px}.mobile-index{display:none}.sidebar-module{margin:18px 0}.sidebar-module>span{font:600 11px 'Barlow Condensed';letter-spacing:1px;color:#899399}.sidebar-module a{display:block;padding:7px 8px;margin-left:-8px;font-size:13px;color:var(--muted);border-left:2px solid transparent;line-height:1.45}.sidebar-module a:hover{color:var(--ink)}.sidebar-module a.active{color:var(--blue);border-left-color:var(--blue);background:#f1f6fc;font-weight:600}.lesson-head{border-bottom:1px solid var(--ink);padding-bottom:42px;margin-bottom:44px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:60px}.breadcrumb span{margin:0 8px;color:#a1aaae}.lesson-kicker{display:flex;align-items:center;gap:14px;font:600 12px 'Barlow Condensed','Noto Sans SC';letter-spacing:1.4px;color:var(--blue)}.lesson-kicker b{border:1px solid var(--blue);padding:4px 9px}.lesson h1{font-size:48px;line-height:1.25;letter-spacing:-1.4px;margin:18px 0}.lesson-deck{font-size:19px;color:#46535a;line-height:1.8;margin:0;max-width:690px}.lesson-meta{display:flex;gap:30px;margin-top:30px;font:600 11px 'Barlow Condensed','Noto Sans SC';letter-spacing:1px;color:#748086}.article-section{margin:48px 0}.article-section h2{font-size:26px;margin:0 0 18px;line-height:1.4}.article-section h2 span{font:600 13px 'Barlow Condensed';color:var(--blue);margin-right:12px}.article-section p{font-size:16px;color:#303b40;line-height:2;margin:14px 0}.article-section ul{padding-left:22px;color:#303b40}.article-section li{padding:5px 0;line-height:1.8}.objective-box{display:grid;grid-template-columns:140px 1fr;background:var(--ink);color:white;padding:30px 34px;margin:42px 0}.objective-box h2{font:600 13px 'Barlow Condensed','Noto Sans SC';letter-spacing:1.5px;color:#8dbdff;margin:5px 0}.objective-box ol{margin:0;padding-left:22px}.objective-box li{padding:5px 0}.tech-diagram{border:1px solid var(--line);background:var(--soft);padding:24px;margin:36px 0}.tech-diagram svg{display:block;width:100%;height:auto}.tech-diagram figcaption{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-top:10px}.callout{border-left:4px solid var(--blue);padding:18px 22px;background:#f1f6fc;margin:30px 0}.callout b{display:block;font-size:13px;color:var(--blue);margin-bottom:5px}.callout p{margin:0;font-size:15px}.drill-card{border:1px solid var(--ink);margin:48px 0;padding:30px;position:relative}.drill-card:before{content:'TRACK DRILL';position:absolute;top:0;right:0;background:var(--blue);color:#fff;font:600 11px 'Barlow Condensed';letter-spacing:1.5px;padding:7px 12px}.drill-card h2{font-size:22px;margin:0 0 12px}.drill-card p{font-size:15px;color:var(--muted)}.metric-row{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);margin-top:20px}.metric-row span{padding:16px 12px 0;border-right:1px solid var(--line);font-size:13px}.metric-row span:last-child{border:0}.metric-row b{display:block;font:600 11px 'Barlow Condensed';color:var(--blue);letter-spacing:1px}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink);margin-top:70px}.lesson-nav a{padding:25px 16px}.lesson-nav a:last-child{text-align:right;border-left:1px solid var(--line)}.lesson-nav small{display:block;color:var(--muted);font-size:11px}.lesson-nav strong{font-size:14px}.article-footer{border-top:1px solid var(--line);padding:0;min-height:100px}.article-footer a{color:var(--blue)}

@media(max-width:900px){.site-header{height:68px;padding:0 20px}.site-header nav{display:none}.header-cta{border:0;padding:0}.hero{grid-template-columns:1fr}.hero-copy{padding:75px 24px 60px}.hero-instrument{border-left:0;border-top:1px solid var(--line);padding:42px 24px}.principles{grid-template-columns:1fr 1fr}.section-heading{grid-template-columns:1fr;gap:20px}.module{grid-template-columns:130px}.module-meta{padding-left:10px}.lesson-list{padding-left:18px}.curriculum{padding-top:75px;padding-bottom:80px}.article-shell{grid-template-columns:1fr;gap:20px;padding:25px 20px 80px}.article-sidebar{border-right:0}.sidebar-sticky{position:static;padding:0}.article-sidebar .eyebrow{display:none}.mobile-index{display:flex;width:100%;align-items:center;justify-content:space-between;border:1px solid var(--line);background:white;padding:12px 14px}.article-sidebar nav{display:none;border:1px solid var(--line);border-top:0;padding:12px}.article-sidebar nav.open{display:block}.breadcrumb{margin-bottom:38px}.lesson h1{font-size:38px}.objective-box{grid-template-columns:1fr}.article-footer{padding:0 20px}}
@media(max-width:600px){.header-cta{font-size:0}.header-cta span{font-size:18px}.hero h1{font-size:64px}.hero-cn{font-size:19px}.hero-actions{align-items:stretch;flex-direction:column}.principles{grid-template-columns:1fr}.principles article{border-bottom:1px solid var(--line)}.section-heading h2,.closing h2{font-size:34px}.module{grid-template-columns:1fr}.module-meta{border-right:0;border-bottom:1px solid #bfc9ce;padding:25px 10px}.module-number{font-size:38px}.lesson-list{padding:8px 0}.lesson-link{grid-template-columns:43px 1fr auto;padding:10px 6px}.lesson-link strong{font-size:15px}.closing{grid-template-columns:1fr;min-height:360px}.lesson h1{font-size:34px}.lesson-deck{font-size:17px}.metric-row{grid-template-columns:1fr}.metric-row span{border-right:0;border-bottom:1px solid var(--line)}footer{padding:25px 20px;flex-wrap:wrap}footer p{width:100%;order:3;margin:0}}