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2rem}.cs-head{padding-block:clamp(2rem,5vw,3.5rem) clamp(2rem,5vw,3rem)}.cs-head .sheet-strip{margin-bottom:1.75rem}.cs-head__back{display:inline-block;margin-bottom:1rem;padding-block:.6rem;font-weight:700;font-size:.9rem;text-decoration:none}.cs-head__title{font-size:clamp(2.4rem,1.2rem + 4.6vw,5rem);font-stretch:108%;letter-spacing:-.035em;line-height:.97;max-width:16ch}.cs-head__lede{margin-top:1.5rem;max-width:60ch;font-size:1.1rem;color:var(--ink-2)}.cs-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,13rem),1fr));margin-top:2.5rem;border:2px solid var(--rule);background:var(--surface)}.cs-meta>div{padding:.75rem .9rem;border-right:1px solid var(--hair);border-bottom:1px solid var(--hair)}.cs-meta dd{margin-top:.3rem;font-size:.95rem;font-weight:500;line-height:1.4}.status-note{display:grid;gap:.35rem 1.5rem;margin-top:1.5rem;padding:1rem 1.1rem;border:2px solid var(--accent);background:var(--surface);color:var(--ink-2);font-size:.97rem}@media(min-width:760px){.status-note{grid-template-columns:9rem minmax(0,70ch)}}.status-note .label{padding-top:.25rem;color:var(--accent-ink)}.fig-stack{display:grid;gap:2.5rem;margin-top:2.5rem}.scope-list{display:grid;margin-top:2rem;border-top:2px solid var(--rule);counter-reset:scope}@media(min-width:860px){.scope-list{grid-template-columns:repeat(5,minmax(0,1fr))}}.scope-list li{counter-increment:scope;padding:1rem 1rem 1.1rem 0;border-bottom:1px solid var(--hair)}.scope-list li:before{content:counter(scope,decimal-leading-zero);display:block;margin-bottom:.4rem;font-size:2.1rem;font-weight:800;font-stretch:75%;letter-spacing:-.02em;line-height:.9;color:var(--accent)}@media(min-width:860px){.scope-list li{padding-left:1rem;border-bottom:0;border-left:1px solid var(--hair)}.scope-list li:first-child{padding-left:0;border-left:0}}.scope-list strong{display:block;font-size:1.05rem;font-weight:800;font-stretch:104%;letter-spacing:-.01em}.scope-list span{display:block;margin-top:.35rem;font-size:.9rem;color:var(--ink-2)}.not-found{padding-block:clamp(3rem,8vw,6rem)}.not-found h1{margin-top:1.5rem;font-size:var(--t-h2);font-stretch:108%;letter-spacing:-.03em;line-height:.98;max-width:16ch}.not-found p{margin-top:1rem;max-width:54ch;color:var(--ink-2)}.tags{display:flex;flex-wrap:wrap;gap:.4rem}.tags li{padding:.25rem .55rem;border:1px solid var(--hair);font-size:.86rem;font-weight:500}.cols-2{display:grid;gap:2.5rem 3.5rem;margin-top:2.5rem}@media(min-width:900px){.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}.cols-2 h3{font-size:1.25rem;font-stretch:104%;margin-bottom:1rem}.challenges{margin-top:2.5rem;counter-reset:challenge}.challenge{counter-increment:challenge;display:grid;gap:1rem 2.5rem;padding:2rem 0;border-top:1px solid var(--hair)}.challenge:first-child{border-top:2px solid var(--rule)}@media(min-width:980px){.challenge{grid-template-columns:4rem minmax(0,.9fr) minmax(0,1.4fr)}}.challenge:before{content:counter(challenge,decimal-leading-zero);font-size:2.75rem;font-weight:800;font-stretch:75%;letter-spacing:-.02em;line-height:.85;color:var(--accent)}.challenge h3{font-size:1.35rem;font-stretch:104%;letter-spacing:-.02em;line-height:1.12}.challenge__tag{display:inline-block;margin-top:.6rem}.challenge__problem{margin-top:.85rem;color:var(--ink-2);font-size:.97rem}.challenge__approach p{color:var(--ink-2);font-size:.97rem}.challenge__approach .challenge__status{margin-top:.9rem;padding-top:.6rem;border-top:1px dashed var(--hair);font-family:var(--mono);font-size:.78rem;color:var(--muted)}.numbers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin-top:2.5rem;border-top:2px solid var(--rule)}.numbers>div{padding:1rem 1rem 1.2rem 0;border-bottom:1px solid var(--hair)}.numbers>div:nth-child(2n){padding-left:1rem;border-left:1px solid var(--hair)}@media(min-width:860px){.numbers{grid-template-columns:repeat(auto-fit,minmax(10rem,1fr))}.numbers>div{border-bottom:0}.numbers>div+div{padding-left:1rem;border-left:1px solid var(--hair)}}.numbers dt{font-size:clamp(1.7rem,1.2rem + 1.5vw,2.4rem);font-weight:800;font-stretch:112%;letter-spacing:-.03em;line-height:1.05}.numbers dd{margin-top:.35rem;font-size:.86rem;color:var(--muted)}.ledger li{position:relative;padding:.55rem 0 .55rem 1.6rem;border-top:1px solid var(--hair);color:var(--ink-2)}.ledger li:before{position:absolute;left:0;top:.5rem;font-weight:800;font-size:1.05rem;line-height:1.3}.ledger--done li:before{content:"+";color:var(--ink)}.ledger--open li:before{content:"–";color:var(--accent-ink)}