:root{--font-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;--font-body: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;--ink: #171a17;--paper: #f5f7f4;--surface: #ffffff;--line: #dce2dc;--line-strong: #c8d1c9;--text: #252a26;--muted: #69716b;--accent: #176b4a;--accent-ink: #115239;--accent-soft: #e7f2ec;--on-ink: #ffffff;--on-ink-muted: #c8d1ca;--r-sm: 3px;--r-md: 6px;--r-lg: 10px;--sh-1: 0 1px 2px rgba(23, 26, 23, .06);--sh-2: 0 14px 36px rgba(23, 26, 23, .14);--ease: cubic-bezier(.2, .7, .2, 1);--dur: .16s;--header-h: 56px;--sidebar-w: 304px;--reading-w: 820px;--overview-w: 1180px}*,*:before,*:after{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scrollbar-gutter:stable}body{margin:0;min-width:320px;color:var(--text);background:var(--paper);font-family:var(--font-body);font-size:16.5px;line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{margin:0;color:var(--ink);font-family:var(--font-display);font-weight:650;line-height:1.22;letter-spacing:-.02em;text-wrap:balance}h1{font-size:clamp(30px,2.4vw,32px)}h2{font-size:clamp(22px,2vw,24px)}h3{font-size:clamp(18px,1.6vw,20px)}h4{font-size:17px}p{margin:0 0 1rem}a{color:var(--accent-ink);text-decoration:none;text-underline-offset:.18em}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button{color:inherit}summary{list-style:none}summary::-webkit-details-marker{display:none}::selection{color:var(--on-ink);background:var(--accent)}:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 70%,white);outline-offset:3px}.site-header{position:sticky;top:0;z-index:100;min-height:var(--header-h);background:#fffffff5;border-top:4px solid var(--ink);border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.site-header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;width:100%;min-height:calc(var(--header-h) - 4px);padding:0 30px}.brand{color:var(--ink);font-family:var(--font-display);font-size:15px;font-weight:700;letter-spacing:-.015em;white-space:nowrap}.brand:hover{color:var(--accent);text-decoration:none}.site-nav-link{color:var(--muted);font-size:13.5px;font-weight:600}.site-nav-link:hover{color:var(--accent-ink);text-decoration:none}.site-main{width:100%;min-height:calc(100vh - var(--header-h))}.site-footer{color:var(--muted);background:var(--paper);border-top:1px solid var(--line);font-size:12.5px}.site-footer-inner{width:min(calc(100% - 48px),var(--overview-w));margin:0 auto;padding:18px 0}.site-footer p{margin:0}.course-shell{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);align-items:start;width:100%;min-height:calc(100dvh - var(--header-h));background:var(--paper)}.course-sidebar{position:sticky;top:var(--header-h);width:var(--sidebar-w);height:calc(100vh - var(--header-h));height:calc(100dvh - var(--header-h));overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;scrollbar-color:var(--line-strong) transparent;scrollbar-width:thin;background:var(--surface);border-right:1px solid var(--line)}.course-content{width:100%;max-width:calc(var(--reading-w) + 12rem);min-width:0;margin:0 auto;padding:38px clamp(48px,6vw,96px) 80px}.course-content>h1{max-width:24ch;margin:.65rem 0 1.5rem;font-size:clamp(30px,3vw,32px);line-height:1.17}.site-main>.hero,.site-main>section[aria-labelledby=course-content-title]{width:min(calc(100% - 48px),var(--overview-w));margin-right:auto;margin-left:auto}.hero{position:relative;overflow:hidden;margin-top:28px;margin-bottom:32px;padding:clamp(38px,6vw,70px) clamp(30px,6vw,76px);color:var(--on-ink);background:var(--ink);border-left:7px solid var(--accent);border-radius:var(--r-sm)}.hero:before{content:"";position:absolute;top:0;right:0;width:28%;height:100%;border-left:1px solid rgba(255,255,255,.08);background-image:linear-gradient(90deg,transparent 49%,rgba(255,255,255,.045) 50%,transparent 51%);background-size:42px 100%;pointer-events:none}.hero>*{position:relative}.eyebrow{display:inline-block;margin:0 0 .75rem;color:var(--muted);font-family:var(--font-mono);font-size:11.5px;font-weight:600;line-height:1.4;letter-spacing:.12em;text-transform:uppercase}.hero .eyebrow{color:#79c6a5}.hero-title{max-width:15ch;margin:0 0 .9rem;color:var(--on-ink);font-size:clamp(38px,5vw,58px);font-weight:720;line-height:1.02;letter-spacing:-.045em}.hero-tagline{max-width:60ch;margin:0 0 1.15rem;color:var(--on-ink-muted);font-size:clamp(16px,1.5vw,18px);line-height:1.6}.hero-stats{display:flex;flex-wrap:wrap;margin:0 0 1.5rem;color:var(--on-ink-muted);font-family:var(--font-mono);font-size:12px;letter-spacing:.025em}.hero-stats span+span:before{content:"·";margin:0 9px;color:#79c6a5}.hero-progress{max-width:540px;margin:0 0 1.25rem}.hero-progress .progress-bar{background:#ffffff2b}.hero-progress .progress-label{color:var(--on-ink-muted)}.site-main>section[aria-labelledby=course-content-title]>.module-header{margin-bottom:12px}.site-main>section[aria-labelledby=course-content-title]>.course-grid{width:100%}.course-grid{display:grid;grid-template-columns:minmax(0,1fr) 276px;gap:24px;align-items:start;margin-bottom:56px}.course-grid>aside{position:sticky;top:calc(var(--header-h) + 24px)}.module-block{margin:0 0 10px;overflow:hidden;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm)}.module-block>summary{cursor:pointer}.module-block>summary:hover{background:var(--accent-soft)}.module-header{display:flex;align-items:baseline;justify-content:space-between;gap:16px}.module-block>summary>.module-header{display:grid;grid-template-columns:66px minmax(0,1fr) auto auto;align-items:center;gap:14px;min-height:58px;padding:12px 16px}.module-block[open]>summary{border-bottom:1px solid var(--line)}.module-header>.mono,.module-block>summary .mono{color:var(--muted);font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;white-space:nowrap}.module-title{color:var(--ink);font-family:var(--font-display);font-size:17px;font-weight:680;line-height:1.3}.module-count{color:var(--muted);font-family:var(--font-mono);font-size:11.5px;white-space:nowrap}.card{overflow:hidden;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm)}.card>h2:first-child{margin:0;padding:18px 18px 8px;font-size:13px;letter-spacing:.07em;text-transform:uppercase}.includes-list{margin:0;padding:0 18px 18px;list-style:none}.includes-list li{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px}.includes-list li:last-child{border-bottom:0}.includes-list strong{color:var(--ink);font-family:var(--font-display);font-size:20px;font-weight:680}.includes-list span{color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;min-height:40px;padding:8px 15px;color:var(--text);background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-sm);font-family:var(--font-body);font-size:14px;font-weight:650;line-height:1.25;cursor:pointer;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease)}.btn:hover{color:var(--accent-ink);background:var(--accent-soft);border-color:var(--accent);text-decoration:none}.btn:active{transform:translateY(1px)}.btn-primary{color:var(--on-ink);background:var(--accent);border-color:var(--accent)}.btn-primary:hover{color:var(--on-ink);background:var(--accent-ink);border-color:var(--accent-ink)}.btn-ghost{background:transparent}.hero .btn-primary{color:var(--ink);background:#d8f2e5;border-color:#d8f2e5}.hero .btn-primary:hover{color:var(--on-ink);background:var(--accent);border-color:var(--accent)}.btn-block{display:flex;width:calc(100% - 36px);margin:0 18px 18px}.progress-bar{width:100%;height:5px;overflow:hidden;background:var(--line);border-radius:999px}.progress-fill{width:0;height:100%;background:var(--accent);border-radius:inherit;transition:width .3s var(--ease)}.progress-label{display:inline-block;margin-top:7px;color:var(--muted);font-family:var(--font-mono);font-size:11.5px;line-height:1.4;letter-spacing:.025em;white-space:nowrap}.circle{display:inline-flex;flex:0 0 18px;align-items:center;justify-content:center;width:18px;height:18px;color:transparent;background:var(--surface);border:1.5px solid #aeb8b0;border-radius:50%;font-size:10px;line-height:1;user-select:none;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease),border-color var(--dur) var(--ease)}.circle.is-done{color:var(--on-ink);background:var(--accent);border-color:var(--accent)}.circle.is-done:after{content:"✓";font-weight:700}.tree{width:100%;color:var(--text);background:var(--surface);font-size:14px}.tree ul{margin:0;padding:0;list-style:none}.tree-module{margin:0;background:var(--surface);border:0;border-bottom:1px solid var(--line);border-radius:0;box-shadow:none}.tree-module-title{display:grid;grid-template-columns:60px minmax(0,1fr) 14px;align-items:center;gap:8px;min-height:54px;padding:11px 14px;color:var(--ink);background:var(--surface);cursor:pointer;font-size:14.5px;font-weight:680;line-height:1.28;user-select:none;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease)}.tree-module-title:hover{color:var(--accent-ink);background:var(--paper)}.tree-module-title>span:first-child{color:var(--muted);font-family:var(--font-mono);font-size:10.5px;font-weight:600;letter-spacing:.065em;text-transform:uppercase;white-space:nowrap}.tree-module-title:after{content:"";width:7px;height:7px;justify-self:end;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translate(-2px,-2px);transition:transform var(--dur) var(--ease)}.tree-module[open]>.tree-module-title{background:var(--paper);border-bottom:1px solid var(--line)}.tree-module[open]>.tree-module-title:after{transform:rotate(225deg) translate(-1px,-1px)}.tree-lesson{margin:0;border:0;border-bottom:1px solid var(--line)}.tree-lesson:last-of-type{border-bottom:0}.tree-link{color:var(--text);text-decoration:none}.tree-lesson>summary.tree-link{display:grid;grid-template-columns:12px minmax(0,1fr) 18px;align-items:center;gap:9px;min-height:46px;padding:9px 14px 9px 18px;background:var(--surface);cursor:pointer;font-size:14.5px;font-weight:590;line-height:1.35;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease)}.tree-lesson>summary.tree-link:before{content:"";width:6px;height:6px;border-right:1.5px solid var(--muted);border-bottom:1.5px solid var(--muted);transform:rotate(-45deg);transition:transform var(--dur) var(--ease)}.tree-lesson[open]>summary.tree-link:before{transform:rotate(45deg) translate(-2px,-2px)}.tree-lesson>summary.tree-link:hover,.tree-lesson>summary.tree-link.is-active{color:var(--accent-ink);background:var(--accent-soft);text-decoration:none}.tree-lesson>summary.tree-link.is-active{box-shadow:inset 4px 0 0 var(--accent)}.tree-topic{margin:0;border-top:1px solid #edf0ed}.tree-topic .tree-link{display:grid;grid-template-columns:minmax(0,1fr) 18px;align-items:center;gap:10px;min-height:40px;padding:8px 14px 8px 39px;color:#4c544e;font-size:13.75px;font-weight:500;line-height:1.4;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease)}.tree-topic .tree-link:hover{color:var(--accent-ink);background:var(--accent-soft);text-decoration:none}.tree-topic .tree-link.is-active{color:var(--on-ink);background:var(--accent);box-shadow:inset 4px 0 0 var(--accent-ink);font-weight:650}.tree-topic .tree-link.is-active .circle{background:transparent;border-color:#ffffffb3}.tree-topic .tree-link.is-active .circle.is-done{color:var(--accent);background:var(--surface);border-color:var(--surface)}.tree-case{display:block;padding:10px 14px 11px 39px;color:var(--muted);border-top:1px solid var(--line);font-family:var(--font-mono);font-size:11px;letter-spacing:.035em}.tree-case:hover{color:var(--accent-ink);background:var(--accent-soft);text-decoration:none}.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:5px 7px;margin:0 0 22px;color:var(--muted);font-size:12.5px;line-height:1.45}.breadcrumb a{color:var(--accent-ink);font-weight:600}.breadcrumb [aria-current=page]{color:var(--text)}.lesson-meta{margin:0 0 8px;color:var(--muted);font-family:var(--font-mono);font-size:11.5px;font-weight:600;line-height:1.45;letter-spacing:.065em;text-transform:uppercase}.section-toc{margin:28px 0 38px;padding:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm)}header.section-toc{display:grid;grid-template-areas:"meta progress" "title progress";grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:2px 20px;margin:30px 0 12px;padding:18px 20px}header.section-toc>p{grid-area:meta;margin:0}header.section-toc>h2{grid-area:title;margin:0}header.section-toc>[data-progress]{grid-area:progress;justify-self:end}header.section-toc .progress-label{margin:0}.section-toc>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;padding:10px 14px;color:var(--ink);cursor:pointer;font-family:var(--font-mono);font-size:11.5px;font-weight:650;line-height:1.4;letter-spacing:.04em;text-transform:uppercase}.section-toc>summary:after{content:"";flex:0 0 auto;width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translate(-2px,-2px);transition:transform var(--dur) var(--ease)}.section-toc[open]>summary:after{transform:rotate(225deg) translate(-1px,-1px)}.section-toc>summary:hover{color:var(--accent-ink);background:var(--accent-soft)}.section-toc ul,.section-toc ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;margin:0;padding:12px 14px 14px;background:var(--line);border-top:1px solid var(--line);list-style:none;counter-reset:topic-step}.section-toc li{min-width:0;background:var(--surface);counter-increment:topic-step}.section-toc a{display:grid;grid-template-columns:28px minmax(0,1fr);align-items:start;gap:8px;height:100%;padding:9px 10px;color:var(--accent-ink);font-size:13.5px;font-weight:600;line-height:1.4}.section-toc a:before{content:counter(topic-step,decimal-leading-zero);color:var(--muted);font-family:var(--font-mono);font-size:11px;line-height:1.75}.section-toc a:hover{background:var(--accent-soft);text-decoration:none}.section-toc a[aria-current=step]{color:var(--on-ink);background:var(--accent)}.section-toc a[aria-current=step]:before{color:#ffffffbd}.topic-section{scroll-margin-top:calc(var(--header-h) + 24px)}.topic-title{margin:48px 0 18px;padding-top:30px;color:var(--ink);border-top:1px solid var(--line);font-size:clamp(22px,2vw,24px)}[data-reading-step]>header.topic-body .topic-title{margin:0 0 18px;padding:0;border:0;font-size:clamp(22px,2vw,24px);line-height:1.22}.course-content>header.topic-body>h1{margin:.65rem 0 1.5rem;font-size:clamp(30px,3vw,32px);line-height:1.17}.course-content>header.module-header{align-items:center;flex-wrap:wrap;margin:0 0 18px;padding:0 0 14px;border-bottom:1px solid var(--line)}.course-content>header.module-header .lesson-meta{margin:0}.course-content>header.module-header .pager-mini{margin-left:auto}.topic-toc{margin:30px 0 38px;padding:15px 18px;color:var(--muted);background:transparent;border-left:3px solid var(--accent)}.topic-toc p{margin:0 0 7px;color:var(--ink);font-family:var(--font-mono);font-size:11.5px;font-weight:650;letter-spacing:.06em;text-transform:uppercase}.topic-toc ul{display:grid;gap:5px;margin:0;padding:0;list-style:none}.topic-toc a{color:var(--accent-ink);font-size:14px;font-weight:600}.lesson-row{display:flex;align-items:center;gap:12px;min-height:50px;padding:11px 13px;color:var(--text);background:var(--surface);border-bottom:1px solid var(--line);text-decoration:none;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease)}.lesson-row:first-of-type{border-top:1px solid var(--line)}.lesson-row:hover{color:var(--accent-ink);background:var(--accent-soft);text-decoration:none}.lesson-row-num{min-width:29px;color:var(--muted);font-family:var(--font-mono);font-size:12px;font-weight:600}.lesson-row-title{flex:1;min-width:0;font-size:15.5px;font-weight:600;line-height:1.42}.lesson-row-meta{color:var(--muted);font-family:var(--font-mono);font-size:11.5px;white-space:nowrap}.module-block>.lesson-row:first-of-type{border-top:0}.topic-body{max-width:var(--reading-w);color:var(--text);font-size:16.5px;line-height:1.75}.topic-body>:first-child{margin-top:0}.topic-body>:last-child{margin-bottom:0}.topic-body p{margin:0 0 1.25em;font-size:16.5px;line-height:1.75;text-wrap:pretty}.topic-body h1,.topic-body h2,.topic-body h3,.topic-body h4{scroll-margin-top:calc(var(--header-h) + 24px);color:var(--ink)}.topic-body h1{margin:2.4rem 0 1rem;font-size:30px}.topic-body h2{margin:3rem 0 1rem;padding-top:1.8rem;border-top:1px solid var(--line);font-size:24px;font-weight:700}.topic-body h3{margin:2.15rem 0 .8rem;font-size:19.5px;font-weight:680}.topic-body h4{margin:1.75rem 0 .65rem;font-size:17.5px;font-weight:680}.topic-body ul,.topic-body ol{margin:0 0 1.35rem;padding-left:1.45rem}.topic-body li{margin:.42rem 0;padding-left:.2rem}.topic-body li::marker{color:var(--accent);font-weight:700}.topic-body a{color:var(--accent-ink);text-decoration:underline;text-decoration-thickness:1px}.topic-body strong{color:var(--ink);font-weight:700}.topic-body hr{margin:2.5rem 0;border:0;border-top:1px solid var(--line)}.topic-body blockquote,blockquote.callout{margin:1.5rem 0;padding:16px 18px;color:var(--text);background:var(--accent-soft);border:0;border-left:4px solid var(--accent);border-radius:0 var(--r-sm) var(--r-sm) 0;font-style:normal}.topic-body blockquote p:last-child,blockquote.callout p:last-child{margin-bottom:0}.key-takeaway{margin:30px 0;padding:24px;background:var(--accent-soft);border:1px solid #c9e0d3;border-left:5px solid var(--accent);border-radius:var(--r-sm)}.key-takeaway .topic-body{font-size:16px}.topic-body code{padding:.12em .34em;color:var(--accent-ink);background:var(--accent-soft);border:1px solid #d1e5da;border-radius:var(--r-sm);font-family:var(--font-mono);font-size:.88em}.topic-body pre,pre.code-block{max-width:100%;margin:1.5rem 0;padding:18px 20px;overflow-x:auto;color:#edf5ef;background:var(--ink);border:1px solid #303730;border-radius:var(--r-sm);font-family:var(--font-mono);font-size:13.5px;line-height:1.65;tab-size:2}.topic-body pre code,pre.code-block code{padding:0;color:inherit;background:transparent;border:0;border-radius:0;font-size:inherit}.table-wrap{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}.topic-body table,.topic-table{width:100%;margin:1.5rem 0 2rem;border-collapse:collapse;color:var(--text);background:var(--surface);font-size:14px;line-height:1.5}.topic-body th,.topic-body td,.topic-table th,.topic-table td{padding:11px 13px;border:1px solid var(--line);text-align:left;vertical-align:top}.topic-body th,.topic-table th{color:var(--ink);background:#edf2ee;font-size:13px;font-weight:700;letter-spacing:.015em}.topic-body tbody tr:nth-child(2n),.topic-table tbody tr:nth-child(2n){background:#fafcf9}.topic-body img{display:block;max-width:100%;height:auto;margin:1.75rem auto;border:1px solid var(--line);border-radius:var(--r-sm)}.pager-mini{display:inline-flex;align-items:center;gap:6px}.pager-mini>a.btn{width:40px;min-width:40px;height:40px;min-height:40px;padding:0;font-family:var(--font-mono);font-size:20px}.complete-btn,.btn.complete-btn{min-height:40px;padding:8px 15px;color:var(--on-ink);background:var(--accent);border-color:var(--accent);border-radius:var(--r-sm);font-size:13.5px;font-weight:680}.complete-btn:hover,.btn.complete-btn:hover,.complete-btn.is-done,.btn.complete-btn.is-done{color:var(--on-ink);background:var(--accent-ink);border-color:var(--accent-ink)}.lesson-pager,.topic-nav{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0;margin-top:52px;border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong)}.pager-card,.topic-nav>a{display:flex;flex-direction:column;justify-content:center;gap:4px;min-height:92px;padding:16px 18px;color:var(--text);background:transparent;border:0;border-radius:0;font-size:14px;text-decoration:none;transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease)}.pager-card+.pager-card,.topic-nav>a+a{border-left:1px solid var(--line);text-align:right}.pager-card:hover,.topic-nav>a:hover{color:var(--accent-ink);background:var(--accent-soft);text-decoration:none}.pager-card strong,.topic-nav strong{color:inherit;font-size:15px;font-weight:680;line-height:1.4}.pager-card .muted,.topic-nav .muted{display:block;font-family:var(--font-mono);font-size:11px;line-height:1.4;letter-spacing:.035em;text-transform:uppercase}.case-banner{margin:10px 0;padding:28px;background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:var(--r-sm)}.case-banner h2{margin-bottom:12px}.case-banner ul{margin:20px 0;padding:0;list-style:none}.case-banner li{padding:9px 0;border-top:1px solid var(--line)}.case-banner label{display:flex;align-items:center;gap:10px}.case-banner input{accent-color:var(--accent)}.muted{color:var(--muted)}.mono{font-family:var(--font-mono)}.pill{display:inline-flex;align-items:center;min-height:24px;padding:3px 8px;color:var(--accent-ink);background:var(--accent-soft);border:1px solid #cee2d6;border-radius:999px;font-family:var(--font-mono);font-size:10.5px;font-weight:650;line-height:1;letter-spacing:.045em;text-transform:uppercase;white-space:nowrap}.skip-link{position:fixed;top:7px;left:8px;z-index:1000;padding:9px 14px;color:var(--on-ink);background:var(--accent-ink);border-radius:var(--r-sm);font-size:14px;font-weight:650;transform:translateY(-160%);transition:transform var(--dur) var(--ease)}.skip-link:focus{transform:translateY(0)}.nav-drawer-toggle,.drawer-scrim{display:none}.nav-drawer-toggle{position:relative;width:42px;height:38px;padding:0;color:var(--ink);background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-sm);cursor:pointer}.hamburger,.hamburger:before,.hamburger:after{position:absolute;left:50%;width:18px;height:2px;background:currentColor;border-radius:2px;transform:translate(-50%)}.hamburger{top:50%;transform:translate(-50%,-50%)}.hamburger:before,.hamburger:after{content:""}.hamburger:before{top:-6px}.hamburger:after{top:6px}body.drawer-open{overflow:hidden}body:has(.drawer-scrim.is-open){overflow:hidden}@media(max-width:1039px){.site-nav{display:none}.nav-drawer-toggle{display:inline-flex;flex:0 0 auto}body:not(:has(.course-shell)) .nav-drawer-toggle{display:none}.course-shell{grid-template-columns:minmax(0,1fr)}.course-sidebar{position:fixed;top:var(--header-h);bottom:0;left:0;z-index:210;width:min(86vw,340px);height:auto;transform:translate(-105%);box-shadow:var(--sh-2);transition:transform var(--dur) var(--ease)}.course-sidebar.is-open{transform:translate(0)}.drawer-scrim{position:fixed;inset:var(--header-h) 0 0;z-index:200;display:block;width:auto;height:auto;padding:0;background:#171a177a;border:0;opacity:0;visibility:hidden;cursor:pointer;transition:opacity var(--dur) var(--ease),visibility var(--dur) var(--ease)}.drawer-scrim.is-open{opacity:1;visibility:visible}.course-content{max-width:calc(var(--reading-w) + 8rem);padding:34px clamp(30px,7vw,64px) 72px}.topic-body table,.topic-table{display:block;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}}@media(max-width:840px){.course-grid{grid-template-columns:minmax(0,1fr)}.course-grid>aside{position:static}.module-block>summary>.module-header{grid-template-columns:62px minmax(0,1fr) auto}.module-block>summary>.module-header>.module-count:last-child{display:none}}@media(max-width:640px){:root{--header-h: 52px}body{font-size:16px}.site-header-inner{min-height:calc(var(--header-h) - 4px);padding:0 16px}.brand{overflow:hidden;max-width:calc(100vw - 86px);font-size:14px;text-overflow:ellipsis}.site-footer-inner,.site-main>.hero,.site-main>section[aria-labelledby=course-content-title]{width:calc(100% - 32px)}.hero{margin-top:16px;margin-bottom:24px;padding:34px 24px;border-left-width:5px}.hero:before{display:none}.hero-title{font-size:clamp(34px,11vw,44px)}.course-content{padding:26px 20px 60px}.course-content>h1{max-width:none;margin-bottom:1.25rem;font-size:28px}h2{font-size:21px}h3{font-size:18px}.breadcrumb{margin-bottom:18px;font-size:12px}.module-header{gap:10px}.module-title{font-size:16px}.module-block>summary>.module-header{grid-template-columns:58px minmax(0,1fr);gap:9px;padding:11px 12px}.module-block>summary>.module-header>.module-count{display:none}.section-toc ul,.section-toc ol{grid-template-columns:minmax(0,1fr)}.lesson-row{gap:10px;padding:11px 10px}.lesson-row-title{font-size:15px}.lesson-row-meta{display:none}.topic-body,.topic-body p{font-size:16px;line-height:1.72}.topic-body h1{font-size:27px}.topic-body h2{margin-top:2.5rem;padding-top:1.5rem;font-size:22px}.topic-body h3{font-size:18.5px}.pager-mini{width:100%}.pager-mini .complete-btn{flex:1}.course-content>header.module-header{align-items:stretch}.course-content>header.module-header .pager-mini{width:100%;margin-left:0}.lesson-pager,.topic-nav{grid-template-columns:minmax(0,1fr);margin-top:42px}.pager-card+.pager-card,.topic-nav>a+a{border-top:1px solid var(--line);border-left:0;text-align:left}.pager-card,.topic-nav>a{min-height:78px;padding:14px 12px}.key-takeaway,.case-banner{padding:20px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media(prefers-contrast:more){:root{--line: #afb9b1;--line-strong: #7f8c82;--muted: #4f5851}.circle{border-width:2px}}