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6px;font-size:1.35rem}h1{letter-spacing:-.01em;margin:0;font-size:clamp(1.8rem,5vw,2.4rem);line-height:1.15}h2{margin:2.2rem 0 .6rem;font-size:1.35rem;line-height:1.25}p{margin:.8rem 0}.lead{color:var(--muted);font-size:1.12rem}.example{flex-direction:column;align-items:center;gap:8px;margin:1.6rem 0;display:flex}.sum{font-family:var(--font-hand);background-color:var(--paper);background-image:linear-gradient(to right, var(--grid) 1px, transparent 1px), linear-gradient(to bottom, var(--grid) 1px, transparent 1px);background-position:18px 10px;background-size:44px 44px;border-radius:12px;grid-template-columns:repeat(4,44px);grid-auto-rows:44px;place-items:center;padding:10px 18px;font-size:2.1rem;line-height:1;display:grid}.sum .carry{color:var(--carry);align-self:end;font-size:1.3rem}.sum .ans{color:var(--ink)}.sum .rule{background:var(--pencil);border-radius:2px;grid-column:1/-1;grid-row-end:span 1;place-self:center stretch;height:3px;margin:-20px 0}.example 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