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92%,var(--ink-1))}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled,.btn[aria-disabled=true]{opacity:.4;cursor:not-allowed}.btn.primary{--btn-bg: var(--accent);--btn-ink: var(--ink-inverse);--btn-rule: var(--accent)}.btn.primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.btn.positive{--btn-bg: var(--positive);--btn-ink: var(--ink-inverse);--btn-rule: var(--positive)}.btn.positive:hover:not(:disabled){background:color-mix(in srgb,var(--positive) 86%,black)}.btn.ghost{--btn-bg: transparent;--btn-rule: transparent;color:var(--ink-2)}.btn.ghost:hover:not(:disabled){background:var(--surface-hover);color:var(--ink-1)}.btn.small{min-height:2.25rem;padding:0 var(--space-3);font-size:var(--text-xs)}.btn.large{min-height:3.25rem;padding:0 var(--space-6);font-size:var(--text-base)}.btn .kbd{margin-left:var(--space-1);border-color:color-mix(in srgb,currentColor 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var(--space-5),var(--measure-wide));margin-inline:auto;padding-block:var(--space-10) var(--space-20)}.page.narrow{width:min(100% - 2 * var(--space-5),46rem)}.page-head{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--space-4);margin-bottom:var(--space-10)}.section{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--space-5);margin-top:var(--space-16)}.section-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:var(--space-3)}.card{border:1px solid var(--rule-1);background:var(--surface-raised)}.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-2);color:var(--ink-2);font-family:var(--font-mono);font-size:var(--text-2xs);letter-spacing:.02em}.crumbs a{color:var(--ink-2);text-decoration:none}.crumbs a:hover{color:var(--accent)}.crumbs .sep{color:var(--rule-2)}.lesson-shell{min-height:100dvh}.lesson-stage{width:min(100% - 2 * var(--space-5),44rem);margin-inline:auto;padding:var(--space-10) 0 calc(var(--space-20) + 5rem)}.lesson-header{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--space-3);margin-bottom:var(--space-10);padding-bottom:var(--space-6);border-bottom:1px solid var(--rule-1)}.lesson-header h1{font-size:clamp(1.875rem,4.4vw,2.625rem)}.lesson-header .boundary{margin:0;color:var(--ink-2);font-size:var(--text-xs);line-height:var(--leading-normal)}.lesson-header .boundary .axis{display:inline-block;width:14px;height:2px;margin-right:var(--space-2);background:var(--axis-line);vertical-align:middle}.lesson-header .boundary code{padding:0 .3em;border:1px solid var(--rule-1);background:var(--wb-sand);font-family:var(--font-mono);font-size:.9em}.lesson-fallback-nav{display:flex;flex-wrap:wrap;gap:var(--space-2);margin-top:var(--space-12);padding-top:var(--space-6);border-top:1px solid var(--rule-1)}.is-playing~.lesson-fallback-nav{display:none}@media(max-width:48rem){.lesson-fallback-nav .btn{flex:1 1 100%;min-width:0;max-width:100%;white-space:normal;overflow-wrap:anywhere;justify-content:flex-start;text-align:left}}.prose{color:var(--ink-1);font-size:1.0625rem;line-height:var(--leading-relaxed);overflow-wrap:break-word}.prose>*+*,.prose section>*+*{margin-top:1.05em}.prose p,.prose li{text-wrap:pretty}.prose>:where(p,ul,ol,blockquote),.prose section>:where(p,ul,ol,blockquote),.prose .concept-reveal>:where(p,ul,ol,blockquote){max-width:68ch}.prose :where(p,ul,ol,blockquote){margin-bottom:0}.prose :where(h2,h3,h4){margin:0;color:var(--ink-1);font-weight:650;text-wrap:balance;scroll-margin-top:calc(var(--bar-height) + var(--space-6))}.prose h2{font-size:var(--text-xl);letter-spacing:-.03em;line-height:1.15}.prose h3{font-size:var(--text-lg);letter-spacing:var(--tracking-tight);line-height:var(--leading-snug)}.prose h4{font-size:var(--text-md);letter-spacing:-.015em}.prose :where(h2,h3,h4)+*{margin-top:.7em}.prose *+:where(h2,h3){margin-top:2em}.prose a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.16em;transition:text-decoration-thickness var(--dur-fast) var(--ease-out)}.prose a:hover{text-decoration-thickness:2px}.prose strong{font-weight:700}.prose :where(ul,ol){padding-left:1.4em}.prose li+li{margin-top:.4em}.prose ul>li::marker{color:var(--ink-3)}.prose ol>li::marker{color:var(--ink-2);font-family:var(--font-mono);font-size:.8em}.prose :not(pre)>code{padding:.08em .32em;border:1px solid var(--rule-1);background:var(--wb-sand);color:var(--ink-1);font-family:var(--font-mono);font-size:.8em;overflow-wrap:anywhere}.prose blockquote{margin-inline:0;padding:var(--space-3) var(--space-4);border-left:3px solid var(--accent);background:var(--accent-wash);color:var(--ink-1)}.prose blockquote>*+*{margin-top:.6em}.prose hr{height:1px;border:0;background:var(--rule-1)}.prose .table-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;border:1px solid var(--rule-1);background:var(--surface-raised)}.prose .table-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.prose .table-scroll table{width:100%;min-width:min(var(--table-min-width, 30rem),100vw);border-collapse:collapse;font-size:var(--text-sm);line-height:var(--leading-normal)}.prose .table-scroll :is(th,td){padding:var(--space-2) var(--space-3);border-bottom:1px solid var(--rule-1);text-align:left;vertical-align:top}.prose .table-scroll th{background:var(--surface-sunken);color:var(--ink-2);font-family:var(--font-mono);font-size:var(--text-2xs);font-weight:600;letter-spacing:.04em;text-transform:uppercase;white-space:nowrap}.prose .table-scroll tr:last-child td{border-bottom:0}.prose .table-scroll tbody tr:hover td{background:var(--surface-hover)}.prose pre:not(.expressive-code pre){padding:var(--space-4);overflow-x:auto;border:1px solid var(--wb-night-2);background:var(--wb-night);color:var(--wb-paper);font-family:var(--font-mono);font-size:.8rem;line-height:1.7}.prose .expressive-code{min-width:0;max-width:100%;margin-block:1.4em}.prose img{border:1px solid var(--rule-1)}.lesson-body .world{--world-width: min(100vw - 2 * var(--space-5), 60rem);width:var(--world-width);max-width:none;margin-inline:calc((100% - var(--world-width)) / 2)}@keyframes rise-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes fade-out{to{opacity:0}}@keyframes slide-from-right{0%{opacity:0;transform:translate(28px)}to{opacity:1;transform:none}}@keyframes slide-to-left{to{opacity:0;transform:translate(-28px)}}@keyframes slide-from-left{0%{opacity:0;transform:translate(-28px)}to{opacity:1;transform:none}}@keyframes slide-to-right{to{opacity:0;transform:translate(28px)}}.rise-in{animation:rise-in var(--dur-slow) var(--ease-out) both}::view-transition-group(*){animation-duration:var(--dur-page);animation-timing-function:var(--ease-out)}::view-transition-old(root){animation:var(--dur-fast) var(--ease-in) both fade-out}::view-transition-new(root){animation:var(--dur-page) var(--ease-out) var(--dur-instant) both rise-in}::view-transition-old(app-bar),::view-transition-new(app-bar),::view-transition-old(lesson-bar),::view-transition-new(lesson-bar){animation:none;mix-blend-mode:normal}@media(prefers-reduced-motion:reduce){::view-transition-group(*),::view-transition-old(*),::view-transition-new(*){animation:none!important}*,*:before,*:after{animation-duration:.001ms!important;animation-delay:0s!important;transition-duration:.001ms!important;transition-delay:0s!important;scroll-behavior:auto!important}}.prose details.mermaid-source,.sl-markdown-content details.mermaid-source{margin:1rem 0 1.5rem;border:1px solid var(--rule-1);border-radius:0;background:var(--surface-page)}.prose details.mermaid-source>summary,.sl-markdown-content details.mermaid-source>summary{min-height:2.75rem;padding:.75rem 1rem;color:var(--ink-2);font-size:.78rem;font-weight:700;cursor:pointer}.prose details.mermaid-source[open]>summary,.sl-markdown-content details.mermaid-source[open]>summary{border-bottom:1px solid var(--rule-1);color:var(--accent)}.prose details.mermaid-source>pre,.sl-markdown-content details.mermaid-source>pre{margin:0}