:root{--paper:#f5f3ec;--white:#fffefa;--ink:#172c36;--muted:#526670;--line:#d3dbd6;--accent:#176d61;--soft:#e6eee8;--gold:#cf913f;font-family:Inter,ui-sans-serif,system-ui,-apple-system,'PingFang SC',sans-serif;color:var(--ink);background:var(--paper);line-height:1.7}*{box-sizing:border-box}body{margin:0}a{color:var(--accent);text-underline-offset:4px}a:hover{color:#094c41}button,input,select{font:inherit}button,select{border:1px solid var(--line);background:var(--white);border-radius:5px;padding:8px 12px;color:var(--ink)}button{cursor:pointer}button:hover{border-color:var(--accent)}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.skip{position:absolute;top:-80px;left:15px;background:white;padding:10px;z-index:100}.skip:focus{top:8px}header{border-bottom:1px solid var(--line);background:var(--white)}.top{max-width:1320px;margin:auto;padding:19px 28px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{text-decoration:none;color:var(--ink);font-weight:750;letter-spacing:-.02em}.brand span{color:var(--accent)}.top nav{display:flex;gap:22px;align-items:center;font-size:14px}.layout{max-width:1320px;margin:auto;display:grid;grid-template-columns:235px minmax(0,1fr);gap:56px;padding:40px 28px 80px}.sidebar{align-self:start;position:sticky;top:20px}.eyebrow{font:700 11px/1.4 ui-monospace,monospace;letter-spacing:.13em;text-transform:uppercase;color:var(--accent)}.sidebar a{display:block;text-decoration:none;color:var(--muted);padding:8px 10px;margin:3px 0;font-size:14px;border-left:2px solid transparent}.sidebar a[aria-current=page]{border-left-color:var(--accent);background:var(--soft);color:var(--ink);font-weight:650}.sidebar hr{border:0;border-top:1px solid var(--line);margin:20px 0}main{min-width:0;max-width:970px}h1{font-size:clamp(32px,4.3vw,55px);line-height:1.14;letter-spacing:-.045em;margin:12px 0 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var(--line);padding:4px 8px;border-radius:3px;background:var(--white)}.facts{align-self:start;background:var(--ink);color:#e9f4ee;border-radius:8px;padding:26px;margin-top:10px}.facts .eyebrow{color:#9bd8bc}.facts strong{display:block;font-size:30px;line-height:1.2;margin:15px 0 4px}.facts p{color:#c1d1d0;font-size:13px;margin:5px 0 20px}.actions{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0}.button{display:inline-block;padding:10px 16px;background:var(--accent);border:1px solid var(--accent);color:white;border-radius:5px;text-decoration:none;font-size:14px;font-weight:600}.button:hover{color:white;background:#0f5148}.button.secondary{color:var(--ink);background:transparent;border-color:var(--line)}.cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}.card{display:block;text-decoration:none;border:1px solid var(--line);border-radius:6px;padding:22px;background:var(--white);color:var(--ink)}.card:hover{border-color:var(--accent);transform:translateY(-1px)}.card p{font-size:14px;color:var(--muted);margin:8px 0}.card h3{margin:10px 0}.note{padding:18px 22px;border-left:3px solid var(--accent);background:var(--soft);font-size:14px;margin:24px 0}.flow{display:flex;gap:10px;align-items:stretch;margin:25px 0;flex-wrap:wrap}.node{flex:1;min-width:135px;border:1px solid var(--line);border-radius:5px;padding:16px;background:var(--white);font-size:13px}.node b{display:block;margin-bottom:8px;font-size:14px}.node.shuffle{border:2px dashed var(--accent);background:var(--soft)}.flow-caption{font-size:12px;color:var(--muted);margin-top:-12px}.quiz{border:1px solid var(--line);border-radius:6px;margin:12px 0;padding:16px 18px;background:var(--white)}summary{font-weight:600;cursor:pointer}.quiz p{font-size:14px;color:var(--muted)}.calculator{border:1px solid var(--line);border-radius:7px;background:var(--white);padding:24px}.calculator label{display:block;font-size:14px;margin:12px 0}.calculator input{width:100%;accent-color:var(--accent)}output{display:block;font:700 25px/1.4 ui-monospace,monospace;color:var(--accent);padding:15px 0}.table-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:6px;margin:20px 0}table{width:100%;border-collapse:collapse;font-size:13px;background:var(--white);text-align:left;white-space:nowrap}th,td{padding:10px 12px;border-bottom:1px solid var(--line)}th{color:var(--muted);font-size:11px;background:var(--soft)}tbody tr:last-child td{border:0}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin:20px 0}.controls label{font-size:13px}.metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{background:var(--white);border:1px solid var(--line);padding:15px;border-radius:6px;font-size:12px;color:var(--muted)}.metric strong{display:block;font:700 22px/1.5 ui-monospace,monospace;color:var(--ink)}#status{min-height:25px;color:var(--muted);font-size:13px}.next{display:flex;gap:15px;justify-content:space-between;border-top:1px solid var(--line);padding-top:25px;margin-top:45px;font-size:14px}.read-toggle{margin:20px 0}footer{border-top:1px solid var(--line);padding:25px 28px;text-align:center;font-size:12px;color:var(--muted)}.code-meta{font:12px ui-monospace,monospace;color:var(--muted);overflow-wrap:anywhere}.small{font-size:13px;color:var(--muted)}.evidence-note{margin-top:15px;font-size:13px;color:var(--muted)}#raw-plan summary,#task-details summary{font-size:14px;padding:14px;background:var(--soft)}#task-table{max-height:420px;overflow:auto}#raw-plan,#task-details{border:1px solid var(--line);margin:18px 0;border-radius:5px}#raw-plan pre{margin:0;border-radius:0}#run-result{max-height:300px;overflow:auto}.bars{display:flex;align-items:flex-end;gap:6px;height:140px;margin-top:20px;border-bottom:1px solid var(--line)}.bar{flex:1;min-width:10px;background:var(--accent);height:var(--height)}.bar-label{font:11px ui-monospace,monospace;display:block;text-align:center}.legend{font-size:12px;color:var(--muted)}@media(max-width:960px){.layout{grid-template-columns:190px minmax(0,1fr);gap:28px}.hero{grid-template-columns:1fr}.facts{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.facts>.eyebrow{grid-column:1/-1}.facts strong{font-size:24px}.top{padding:16px 22px}.top nav{gap:12px}.cards{grid-template-columns:1fr}}@media(max-width:680px){.layout{display:block;padding:22px 18px 50px}.sidebar{position:static;margin-bottom:30px;display:flex;gap:4px;overflow:auto;border-bottom:1px solid var(--line);padding-bottom:12px}.sidebar>a{flex-shrink:0;max-width:170px;font-size:12px;padding:8px}.sidebar .eyebrow,.sidebar hr{display:none}.top{align-items:flex-start;padding:16px 18px;gap:10px}.brand{font-size:14px;max-width:155px;line-height:1.4}.top nav{font-size:12px;gap:12px}.top .home-link{display:none}h1{font-size:37px}.prose h1{font-size:32px}.prose{font-size:16px}.hero{padding-top:0;gap:10px}.facts{padding:20px}.cards{gap:12px}.metric-grid{grid-template-columns:1fr}.node{min-width:125px}.controls{gap:10px}.controls select{max-width:100%}pre{padding:16px;font-size:12px}.next{flex-wrap:wrap}.intro{font-size:17px}}
/* Course source registry: pre-rendered content remains readable without JS. */
.resource-card{border:1px solid var(--line,#d7dfdf);border-radius:10px;padding:1.1rem 1.3rem;margin:1rem 0;overflow-wrap:anywhere}
.resource-card h3{margin-top:0}.resource-card.compact{padding:.6rem 1rem}.resource-card.compact h3{font-size:1rem;margin:.3rem 0}
#resource-search{display:block;width:100%;box-sizing:border-box;padding:.8rem;margin-top:.5rem;font:inherit;border:1px solid #899b9d;border-radius:6px}
[hidden]{display:none!important}