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monospace;--text-xs:.75rem;--text-sm:.875rem;--text-base:1.0625rem;--text-md:1.3281rem;--text-lg:1.6602rem;--text-xl:2.0752rem;--text-2xl:2.594rem;--text-display-s:clamp(2.25rem, 3.6vw + 1rem, 4rem);--text-display:clamp(2.75rem, 5vw + 1rem, 5.25rem);--leading-tight:1.08;--leading-snug:1.25;--leading-body:1.6;--space-3xs:.125rem;--space-2xs:.25rem;--space-xs:.5rem;--space-sm:.75rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2.5rem;--space-2xl:4rem;--space-3xl:6rem;--space-4xl:9rem;--rule-hair:1px;--rule-focus:2px;--radius-sm:4px;--radius-md:10px;--radius-lg:18px;--radius-pill:999px;--ease-out:cubic-bezier(.16, 1, .3, 1);--ease-in:cubic-bezier(.7, 0, .84, 0);--ease-in-out:cubic-bezier(.65, 0, .35, 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(hover:hover){.btn:hover{background:var(--color-paper-4);border-color:var(--color-accent-dim);color:var(--color-ink)}}.btn:active{transform:translateY(1px)}.btn:disabled,.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed;transform:none}.btn[data-state=busy]{cursor:progress}.btn[data-state=error]{border-color:var(--color-ember);color:var(--color-ember)}.btn[data-state=done]{border-color:var(--color-accent-deep);color:var(--color-accent)}.btn--primary{background:var(--color-accent);border-color:var(--color-accent);color:var(--color-accent-ink)}@media (hover:hover){.btn--primary:hover{background:var(--color-focus);border-color:var(--color-focus);color:var(--color-accent-ink)}}.rail{z-index:var(--z-sticky);justify-content:space-between;align-items:center;gap:var(--space-sm);padding:var(--space-sm) clamp(1rem, 4vw, 2rem);background:var(--color-paper-2);flex-wrap:wrap;display:flex;position:sticky;top:0}.rail__mark{font-family:var(--font-display);font-variation-settings:"ROND" 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var(--ease-out);text-decoration:none;display:flex}@media (hover:hover){.rail__pages a:hover,.rail__sections a:hover{background:var(--color-paper-3);color:var(--color-ink)}}.rail__pages a[aria-current=page]{color:var(--color-ink);font-weight:600}.rail__pages a:before{content:"";background:var(--color-paper-4);border-radius:1px;flex:none;width:.5rem;height:.5rem}.rail__pages a[aria-current=page]:before{background:var(--color-accent)}.rail__sections{gap:var(--space-3xs);padding-block:var(--space-sm) var(--space-md);display:grid}.rail__sections-title{margin:var(--space-sm) var(--space-xs) var(--space-2xs);font-family:var(--font-body);font-size:var(--text-xs);color:var(--color-neutral);letter-spacing:.06em;font-weight:600}.rail__num{border-radius:var(--radius-sm);background:var(--color-paper-3);width:1.75rem;height:1.75rem;color:var(--color-muted);font-family:var(--font-mono);font-size:var(--text-xs);font-variant-numeric:tabular-nums;transition:background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out);flex:none;place-items:center;display:grid}.rail__sections a.is-active{color:var(--color-ink)}.rail__sections a.is-active .rail__num{background:var(--color-accent);color:var(--color-accent-ink)}main{padding:0 clamp(1rem,4vw,3.5rem);display:block}@media (width>=60rem){body{padding-left:var(--rail-width)}.rail{width:var(--rail-width);padding:var(--space-xl) var(--space-md) var(--space-lg);box-sizing:border-box;flex-flow:column;justify-content:flex-start;align-items:stretch;position:fixed;inset:0 auto 0 0;overflow-y:auto}.rail__mark{font-size:var(--text-md);letter-spacing:-.01em;padding:0 var(--space-xs) var(--space-lg);line-height:1}.rail__toggle{display:none}.rail__menu,.rail.js-ready:not(.is-open) .rail__menu{display:block}.rail.js-ready .rail__collapse{display:grid}.rail-collapsed body{padding-left:var(--rail-folded)}.rail-collapsed .rail{width:var(--rail-folded);padding-inline:var(--space-2xs);align-items:center}.rail-collapsed .rail__mark{padding:0 0 var(--space-lg);font-size:var(--text-2xl)}.rail-collapsed .rail__mark-dot{margin:0}.rail-collapsed :is(.rail__mark-text,.rail__page-label,.rail__label,.rail__sections-title){clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.rail-collapsed :is(.rail__pages,.rail__sections) a{justify-content:center;padding:0}.rail-collapsed .rail__pages{padding-block:0 var(--space-md);border-bottom:1px solid var(--color-paper-4)}.rail-collapsed .rail__sections{padding-top:var(--space-md)}}.rail__collapse{border:1px solid var(--color-paper-4);border-radius:var(--radius-sm);width:2.5rem;height:2.5rem;color:var(--color-muted);cursor:pointer;transition:background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out);background:0 0;flex:none;align-self:flex-start;place-items:center;display:none}.rail-collapsed .rail__collapse{align-self:center}@media (hover:hover){.rail__collapse:hover{background:var(--color-paper-3);color:var(--color-ink)}}.rail__collapse:focus-visible{outline:var(--rule-focus) solid var(--color-focus);outline-offset:2px}.rail__collapse-icon{border-bottom:2px solid;border-left:2px solid;width:.55rem;height:.55rem;transform:translate(.1rem)rotate(45deg)}.rail-collapsed .rail__collapse-icon{transform:translate(-.1rem)rotate(-135deg)}.page{max-width:var(--page-max);padding-bottom:var(--space-3xl);margin:0 auto}.page__head{padding:var(--space-3xl) 0 var(--space-xl)}.page__lede{font-size:var(--text-md);color:var(--color-ink-2);max-width:28.23em;margin-top:var(--space-lg);line-height:1.5}.lesson{max-width:var(--page-max);padding-bottom:var(--space-3xl);margin:0 auto}.lesson__head{padding:var(--space-2xl) 0 var(--space-xl);padding-top:var(--space-lg)}.lesson__plate{aspect-ratio:12/5;object-fit:cover;object-position:80% 50%;width:100%;height:auto;margin-bottom:var(--space-xl);border-radius:var(--radius-md);mask-image:linear-gradient(to bottom, var(--color-paper) 72%, transparent);display:block}.lesson__kicker{margin-bottom:var(--space-sm);font-family:var(--font-body);font-size:var(--text-sm);letter-spacing:.1em;text-transform:uppercase;color:var(--color-accent);font-weight:700;font-stretch:112%;display:block}.lesson__title{font-size:var(--text-display-s)}.lesson__summary{font-size:var(--text-md);color:var(--color-ink-2);max-width:31.91em;margin-top:var(--space-lg);line-height:1.5}.lesson__block{padding-top:var(--space-2xl)}.lesson__block+.lesson__block{margin-top:var(--space-md)}.lesson__block>h2:before{content:"";width:var(--space-xl);height:2px;margin-bottom:var(--space-md);background:var(--color-accent-low);border-radius:1px;display:block}#run.lesson__block{padding-top:var(--space-3xl)}@media (width>=48rem){.lesson__head{padding:var(--space-xl) 0 var(--space-2xl)}.lesson__block{padding-top:var(--space-3xl)}#run.lesson__block{padding-top:var(--space-4xl)}}.lesson__parts{gap:var(--space-xs);padding:0;list-style:none;display:grid}.lesson__parts li{gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);background:var(--color-paper-2);align-items:baseline;display:flex}.lesson__parts li:before{content:"";background:var(--color-paper-4);border-radius:1px;flex:none;width:.45rem;height:.45rem;transform:translateY(-.1em)}.lesson__stuck{color:var(--color-muted);margin-top:var(--space-lg)}.lesson__next{margin-top:var(--space-3xl)}.lesson__next a{font-weight:650}.playground{gap:var(--space-lg) var(--space-xl);flex-wrap:wrap;align-items:flex-start;display:flex}.playground>.code{flex:auto;min-width:0;max-width:100%}.playground__notes{flex:27.63em;min-width:0}.playground__notes>:first-child{margin-top:0}.code{border-radius:var(--radius-md);background:var(--color-paper-2);margin:0;overflow:hidden}.code__bar{justify-content:space-between;align-items:center;gap:var(--space-sm);padding:var(--space-xs) var(--space-xs) var(--space-xs) var(--space-md);background:var(--color-paper-3);display:flex}.code__name{font-size:var(--text-xs);color:var(--color-muted);letter-spacing:.02em;overflow-wrap:anywhere;background:0 0;border-radius:0;min-width:0;margin:0;padding:0}.code__copy{min-height:2.25rem;padding:0 var(--space-md);font-size:var(--text-xs)}.code__pre,.code pre.astro-code{padding:var(--space-md) var(--space-lg) var(--space-lg);tab-size:2;margin:0;font-size:.8125rem;line-height:1.7;overflow-x:auto;background-color:#0000!important}.code pre.astro-code:focus-visible{outline-offset:-2px}.code{--shiki-foreground:var(--color-code-plain);--shiki-background:var(--color-paper-2);--shiki-token-keyword:var(--color-code-keyword);--shiki-token-function:var(--color-code-function);--shiki-token-constant:var(--color-code-constant);--shiki-token-string:var(--color-code-string);--shiki-token-string-expression:var(--color-code-string);--shiki-token-comment:var(--color-code-comment);--shiki-token-parameter:var(--color-code-plain);--shiki-token-punctuation:var(--color-code-punct);--shiki-token-link:var(--color-code-string)}.regtable-panel{margin-top:var(--space-xl);border-radius:var(--radius-md);background:var(--color-paper-2)}.regtable__caption{padding:var(--space-md) var(--space-md) var(--space-xs);color:var(--color-muted);font-size:var(--text-sm);margin:0}.regtable-wrap{border-radius:0 0 var(--radius-md) var(--radius-md);overflow-x:auto}.regtable-wrap,.code pre.astro-code{background-image:linear-gradient(to right, var(--color-paper-2) 40%, transparent), linear-gradient(to left, var(--color-paper-2) 40%, transparent), radial-gradient(farthest-side at 0 50%, var(--color-stage-fog), transparent), radial-gradient(farthest-side at 100% 50%, var(--color-stage-fog), transparent);background-position:0,100%,0,100%;background-size:var(--space-xl) 100%, var(--space-xl) 100%, var(--space-md) 100%, var(--space-md) 100%;background-repeat:no-repeat;background-attachment:local,local,scroll,scroll}@property --edge-start{syntax:"<length>";inherits:false;initial-value:0}@property --edge-end{syntax:"<length>";inherits:false;initial-value:0}@keyframes edge-fade{0%{--edge-start:0px;--edge-end:var(--space-xl)}8%,92%{--edge-start:var(--space-xl);--edge-end:var(--space-xl)}to{--edge-start:var(--space-xl);--edge-end:0px}}@supports (animation-timeline:scroll()){.regtable-wrap,.code pre.astro-code{mask-image:linear-gradient(to right, transparent, var(--color-paper) var(--edge-start), var(--color-paper) calc(100% - var(--edge-end)), transparent);animation-name:edge-fade;animation-timing-function:linear;animation-fill-mode:both;animation-timeline:scroll(self inline)}.regtable-wrap:focus-visible,.code pre.astro-code:focus-visible{outline:none}.regtable-panel:has(>.regtable-wrap:focus-visible),.code:has(>pre.astro-code:focus-visible){outline:var(--rule-focus) solid var(--color-focus);outline-offset:2px}}.regtable{border-collapse:separate;border-spacing:3px;width:100%;min-width:40rem;font-size:var(--text-xs);padding:var(--space-sm)}.regtable th,.regtable td{padding:var(--space-xs) var(--space-xs);text-align:center;border-radius:var(--radius-sm);white-space:nowrap}.regtable thead th{color:var(--color-neutral);font-weight:500}.regtable tbody th{text-align:left;color:var(--color-ink);font-weight:650}.regtable tbody td{background:var(--color-paper-3);color:var(--color-ink-2)}.regtable tbody td.regtable__addr{color:var(--color-accent);background:0 0}.regtable tbody td.regtable__none{color:var(--color-neutral);background:0 0}.drill{gap:var(--space-md);counter-reset:drill;margin:0;padding:0;list-style:none;display:grid}.drill__item{counter-increment:drill;padding:var(--space-lg);border-radius:var(--radius-md);background:var(--color-paper-2);max-width:none}.drill__question{font-weight:600;font-size:var(--text-md);margin-bottom:var(--space-md);max-width:32.07em;line-height:1.4}.drill__question:before{content:counter(drill) "  ";font-family:var(--font-mono);font-size:var(--text-sm);color:var(--color-accent)}.drill__answer summary{min-height:2.5rem;padding:0 var(--space-md);border-radius:var(--radius-pill);background:var(--color-paper-3);border:var(--rule-hair) solid var(--color-rule);font-size:var(--text-sm);cursor:pointer;white-space:nowrap;transition:background-color var(--dur-short) var(--ease-out);align-items:center;font-weight:650;list-style:none;display:inline-flex}.drill__answer summary::-webkit-details-marker{display:none}@media (hover:hover){.drill__answer summary:hover{background:var(--color-paper-4)}}.drill__answer[open] summary{background:var(--color-accent-dim);border-color:var(--color-accent-deep);color:var(--color-ink)}.drill__answer p{margin:var(--space-md) 0 0;color:var(--color-ink-2)}.wiring{margin:var(--space-xl) 0 0;padding:var(--space-lg);border-radius:var(--radius-md);background:var(--color-paper-2);gap:var(--space-2xs);border:0;min-width:0;display:grid}.wiring__legend{float:left;width:100%;margin-bottom:var(--space-sm);padding:0;font-weight:650}.wiring__item{gap:var(--space-sm);padding:var(--space-xs) 0;cursor:pointer;align-items:flex-start;line-height:1.5;display:flex}.wiring__item input{appearance:none;width:1.25rem;height:1.25rem;margin:var(--space-3xs) 0 0;border-radius:var(--radius-sm);background:var(--color-paper-3);border:var(--rule-hair) solid var(--color-neutral);cursor:pointer;transition:background-color var(--dur-micro) var(--ease-out);flex:none}.wiring__item input:checked{background:var(--color-accent);border-color:var(--color-accent)}.wiring__item input:checked+span{color:var(--color-muted)}.cite{font-family:var(--font-mono);margin-left:var(--space-3xs);font-size:.68em;line-height:0}.cite a{color:var(--color-accent);padding:0 var(--space-3xs);text-decoration:none}@media (hover:hover){.cite a:hover{text-decoration:underline}}.sources{gap:var(--space-sm);counter-reset:src;font-size:var(--text-sm);padding-left:0;list-style:none;display:grid}.sources__item{counter-increment:src;gap:var(--space-xs);scroll-margin-top:var(--space-3xl);grid-template-columns:2rem minmax(0,1fr);max-width:none;display:grid}.sources__item:before{content:counter(src);font-family:var(--font-mono);color:var(--color-accent)}.sources__item a{overflow-wrap:anywhere}.sources__item:target{background:var(--color-paper-2);border-radius:var(--radius-sm)}.sources__note{color:var(--color-muted)}.colophon{padding:var(--space-2xl) clamp(1rem, 4vw, 3.5rem) var(--space-xl);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-neutral);line-height:1.8}.colophon p{max-width:72ch;margin:0 auto 0 0}.colophon a{color:var(--color-muted)}.checklist label:active{background:var(--color-paper-4)}.drill__answer summary:active{transform:translateY(1px)}input:disabled{opacity:.55;cursor:not-allowed}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.15s!important;animation-duration:.15s!important;animation-iteration-count:1!important}}.checklist{gap:var(--space-xs);counter-reset:check;max-width:52rem;margin:0;padding:0;list-style:none;display:grid}.checklist li{counter-increment:check;max-width:none}.checklist label{gap:var(--space-sm);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-md);background:var(--color-paper-2);cursor:pointer;transition:background-color var(--dur-short) var(--ease-out);grid-template-columns:1.75rem 1.25rem minmax(0,1fr);align-items:start;display:grid}.checklist label:before{content:counter(check);font-family:var(--font-mono);font-size:var(--text-sm);color:var(--color-neutral);line-height:1.6}@media (hover:hover){.checklist label:hover{background:var(--color-paper-3)}}.checklist input{appearance:none;width:1.25rem;height:1.25rem;margin:var(--space-3xs) 0 0;border-radius:var(--radius-sm);background:var(--color-paper-3);border:var(--rule-hair) solid var(--color-neutral);cursor:pointer;transition:background-color var(--dur-micro) var(--ease-out)}.checklist input:checked{background:var(--color-accent);border-color:var(--color-accent)}.checklist input:checked+span{color:var(--color-muted)}.checklist label:has(input:checked):before{color:var(--color-accent)}.stuck__next{margin-top:var(--space-xl)}.lost__code{overflow-wrap:anywhere;min-width:0;font-family:var(--font-display);font-variation-settings:"ROND" 100;color:var(--color-accent-low);margin:0 0 var(--space-lg);font-size:clamp(5rem,14vw,9rem);font-weight:800;line-height:.9}.lost__links{align-items:center;gap:var(--space-sm);flex-wrap:wrap;display:flex}@media (forced-colors:active){.rail__sections a.is-active .rail__num,.checklist input:checked,.wiring__item input:checked{forced-color-adjust:none;color:highlighttext;background:highlight;border-color:highlight}.rail__pages a[aria-current=page]:before,.rail__mark-dot{forced-color-adjust:none;box-shadow:none;background:highlight}}