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[aria-current=step]{color:var(--lb-ink);font-weight:600}.example__run{align-items:flex-start;gap:var(--lb-space-xs);margin-top:var(--lb-space-xs);flex-direction:column;display:flex}.example__run>div{width:100%}.gate__confirm{border-left:2px solid var(--lb-accent);padding-left:var(--lb-space-md);margin:var(--lb-space-md) 0}.gate__content{margin-top:var(--lb-space-lg)}.gate__content h3:focus{outline:none}.gate__content h3:focus-visible{outline:2px solid var(--lb-focus)}.chart__frame .uplot,.workbench__panel .uplot{font-family:var(--lb-font-body);color:var(--lb-ink)}.chart__key{font-size:var(--lb-text-caption);color:var(--lb-charcoal);margin:var(--lb-space-xs) 0 0}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{background:var(--lb-canvas);color:var(--lb-ink);font-family:var(--lb-font-body);font-size:var(--lb-text-body);margin:0;line-height:1.65}:focus-visible{outline:2px solid 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var(--lb-ease);padding:.625rem 1.25rem;font-size:.9375rem;font-weight:500;line-height:1.2;text-decoration:none;display:inline-flex}.button--outline{color:var(--lb-ink);border-color:var(--lb-ink);background:0 0}.button--quiet{color:var(--lb-ink);border-color:var(--lb-hairline-strong);background:0 0}.button:active,.button:focus-visible{box-shadow:inset 0 -2px 0 var(--lb-button-rule)}.button--outline:active,.button--quiet:active,.button--outline:focus-visible,.button--quiet:focus-visible{background:var(--lb-deep);box-shadow:inset 0 -2px 0 var(--lb-accent)}@media (hover:hover){.button:hover{background:var(--lb-button-hover);box-shadow:inset 0 -2px 0 var(--lb-button-rule)}.button--outline:hover,.button--quiet:hover{background:var(--lb-deep);box-shadow:inset 0 -2px 0 var(--lb-accent)}}.button[aria-disabled=true],.button:disabled{cursor:progress;border-color:var(--lb-hairline-strong);background:var(--lb-deep);color:var(--lb-charcoal);box-shadow:none}.site-header{z-index:10;height:var(--lb-header-height);align-items:center;gap:var(--lb-space-lg);padding:0 var(--lb-space-lg);background:var(--lb-canvas);border-bottom:1px solid var(--lb-hairline);display:flex;position:sticky;top:0}.wordmark{font-family:var(--lb-font-display);letter-spacing:.14em;text-transform:uppercase;color:var(--lb-ink);white-space:nowrap;font-size:.8125rem;font-weight:500;text-decoration:none}.wordmark span{color:var(--lb-slate)}.site-nav{gap:var(--lb-space-md);margin-right:auto;display:flex}.site-nav a{min-height:2.75rem;color:var(--lb-ink);border-bottom:2px solid #0000;align-items:center;font-size:.9375rem;font-weight:500;text-decoration:none;display:inline-flex}.site-nav a[aria-current=page]{border-bottom-color:var(--lb-accent)}@media (hover:hover){.site-nav 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h2{font-size:var(--lb-text-h3);margin-bottom:var(--lb-space-sm)}.map ol{gap:var(--lb-space-xxs);margin:0;padding:0;list-style:none;display:grid}.map ol li{gap:var(--lb-space-sm);grid-template-columns:3rem 1fr auto;align-items:baseline;display:grid}.map .number{font-family:var(--lb-font-mono);font-size:var(--lb-text-small);color:var(--lb-slate)}.map .soon{color:var(--lb-charcoal)}.lesson{--lb-switch-height:0px}.lesson__text{padding:var(--lb-space-xl) var(--lb-space-lg) var(--lb-space-section);min-width:0}.lesson__text>*{max-width:44rem}.lesson__workbench{min-width:0}.view-switch{display:none}@media (width>=64rem){.lesson{grid-template-columns:minmax(0,46rem) minmax(0,1fr);align-items:start;display:grid}.lesson__workbench{top:var(--lb-header-height);height:calc(100dvh - var(--lb-header-height));border-left:1px solid var(--lb-hairline);position:sticky}}@media (width<=63.99rem){.lesson{--lb-switch-height:3rem}.view-switch{top:var(--lb-header-height);z-index:9;height:var(--lb-switch-height);background:var(--lb-canvas);border-bottom:1px solid var(--lb-hairline);display:flex;position:sticky}.view-switch button{color:var(--lb-ink);font:500 .9375rem var(--lb-font-display);cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;flex:1}.view-switch button[aria-pressed=true]{border-bottom-color:var(--lb-accent)}.lesson__workbench{height:calc(100dvh - var(--lb-header-height) - var(--lb-switch-height))}.lesson[data-view=lesson] .lesson__workbench,.lesson[data-view=code] .lesson__text{display:none}}.lesson-header{margin-bottom:var(--lb-space-xl)}.lesson-header h1{margin-bottom:var(--lb-space-sm)}.beat{border-top:1px solid var(--lb-hairline);padding:var(--lb-space-xl) 0 var(--lb-space-lg)}.beat h2{font-size:var(--lb-text-h3)}.signature{font-family:var(--lb-font-mono);font-size:var(--lb-text-small);color:var(--lb-charcoal)}.example{margin:0 0 var(--lb-space-lg)}.example pre{margin-bottom:0}.check{border-left:2px solid var(--lb-accent);padding-left:var(--lb-space-md)}.check__question{font-weight:600}details.hint,details.reveal{border-bottom:1px solid var(--lb-hairline)}details.hint>summary,details.reveal>summary{cursor:pointer;align-items:center;min-height:2.75rem;font-weight:500;list-style:none;display:flex}details.hint>summary::-webkit-details-marker,details.reveal>summary::-webkit-details-marker{display:none}details.hint>summary:before,details.reveal>summary:before{content:"+";font-family:var(--lb-font-mono);width:1.5rem;color:var(--lb-accent-text)}details[open].hint>summary:before,details[open].reveal>summary:before{content:"−"}.preview{border:1px dashed var(--lb-hairline-strong);padding:var(--lb-space-md);margin-bottom:var(--lb-space-md)}.preview pre{margin-bottom:0}.recap ul{padding-left:1.25rem}.pager{justify-content:space-between;gap:var(--lb-space-md);border-top:1px solid var(--lb-hairline);padding-top:var(--lb-space-lg);display:flex}.chart{margin:0 0 var(--lb-space-lg)}.chart__plot{min-height:16rem}.chart figcaption{font-size:var(--lb-text-caption);color:var(--lb-charcoal);margin-top:var(--lb-space-xs)}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:0s!important;animation-duration:0s!important}}