:root{color-scheme:dark;--bg:#090a0b;--panel:#121315;--ink:#e9e7df;--body:#b7b7b0;--muted:#a2a39c;--line:#37383a;--red:#ee8470;--mono:Consolas,'Liberation Mono',monospace;--sans:Arial,Helvetica,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 var(--sans)}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--red)}button,input,select{font:inherit}button,select{cursor:pointer}button{background:transparent;color:var(--ink);border:1px solid #65665f;min-height:44px;padding:9px 16px}button:hover{border-color:var(--red)}button:disabled,select:disabled{opacity:.55;cursor:default}button[aria-pressed=true]{background:var(--ink);color:var(--bg)}:is(a,button,input,select,summary,pre,[tabindex]):focus-visible{outline:2px solid 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var(--mono);color:#f39584;min-height:20px}.answers{display:grid;grid-template-columns:1fr 1fr;border-block:1px solid var(--line);padding-block:24px;gap:15px}.answers span{font:10px var(--mono);color:var(--muted)}.answers strong{display:block;font:36px/1.2 Georgia,serif;margin-top:10px}.answers>div:first-child strong{color:var(--red)}.arithmetic{font:12px/1.9 var(--mono);color:var(--body);overflow-wrap:anywhere;min-height:45px}.challenge button{font:11px var(--mono)}.table-scroll{overflow:auto;border:1px solid var(--line)}table{border-collapse:collapse;width:100%;min-width:640px;text-align:left;font:12px/1.8 var(--mono)}th{font-size:10px;font-weight:400;color:var(--muted);background:var(--panel)}th,td{padding:20px;border-bottom:1px solid var(--line)}tbody tr:last-child td{border:0}td:nth-child(4){color:var(--red)}.method-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:38px;margin-block:35px}.method-grid h3{font:24px Georgia,serif;margin-bottom:14px}.method-grid p{font-size:14px;color:var(--body);line-height:1.9}.provenance{border-block:1px solid var(--line);padding-block:23px}.provenance summary{cursor:pointer;font:13px var(--mono);padding-block:8px}.provenance pre{font-size:11px}.source-links{display:flex;flex-wrap:wrap;gap:16px 28px;margin-top:25px}.source-links a{font:11px/1.8 var(--mono);color:var(--red)}.reading{max-width:850px;margin:90px auto}.reading>p:not(.eyebrow){color:var(--body);font-size:17px;line-height:1.9}.reading h2{margin-bottom:30px}code{font-family:var(--mono);font-size:.85em;color:#e2c3b8;overflow-wrap:anywhere}footer{border-top:1px solid var(--line);padding-block:30px;font:9px/1.8 var(--mono);color:var(--muted);display:flex;gap:25px;justify-content:space-between}
@media(max-width:1000px){header,main,footer{width:calc(100% - 48px)}.instrument{grid-template-columns:1fr}.graph-panel{border-right:0;border-bottom:1px solid var(--line)}.graph-scroll{max-height:450px}.graph-scroll svg{max-width:620px;margin:auto}.challenge{gap:35px}.ribbon>div{padding:19px}.ribbon b{font-size:32px}.method-grid{gap:25px}}
@media(max-width:650px){header,main,footer{width:calc(100% - 36px)}header{min-height:76px;font-size:8px}header>span{display:none}.signature{gap:9px}.signature img{width:28px}.cover{padding:35px 0 50px}.cover-meta{flex-direction:column;gap:8px;font-size:8px}h1{font-size:clamp(43px,10.6vw,69px);margin-block:32px}.cover-bottom{display:block}.cover-bottom p{font-size:16px}.cover-bottom a{display:inline-block;margin-top:22px}.ribbon{grid-template-columns:1fr 1fr;margin-top:30px}.ribbon>div:nth-child(2){border-right:0}.ribbon>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.ribbon b{font-size:29px}.ribbon span{font-size:7px}.section-head{display:block}.section-head>p{margin-top:20px}.toolbar{gap:16px;flex-wrap:wrap}.toolbar label{flex:1 1 100%}.toolbar select{width:100%}.toolbar>button{padding-inline:10px}.function-note{font-size:13px}.panel-head{padding:15px 12px;font-size:8px}.graph-scroll{padding:8px}pre{padding:17px;font-size:11px}.challenge{grid-template-columns:1fr;gap:25px;margin-block:52px;padding-block:35px}.challenge-panel{padding:18px}.inputs{grid-template-columns:1fr}.inputs label{display:grid;grid-template-columns:85px 1fr;gap:8px;align-items:center}.inputs input{margin:0}.answers strong{font-size:30px}.method-grid{grid-template-columns:1fr;gap:8px}.record .section-head>a{display:inline-block;margin-top:23px}.provenance summary{line-height:1.8}.reading{margin-block:55px}.reading>p:not(.eyebrow){font-size:15px}.source-links a{font-size:10px}footer{flex-wrap:wrap;font-size:8px}.scope-line{font-size:10px}.panel-foot{font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

.type-note{border-left:2px solid var(--red);background:var(--panel);padding:22px 28px;margin-block:30px}.type-note h3{font:27px/1.2 Georgia,serif;margin:0 0 20px}.type-note p{font-size:14px;color:var(--body);line-height:1.9}
.challenge>*{min-width:0}.inputs label{min-width:0}.inputs input{min-width:0;width:100%}.challenge h2{overflow-wrap:anywhere}