:root{color-scheme:dark;--bg:#080e18;--panel:#142130;--line:#304458;--ink:#eef4fa;--muted:#aec0d1;--accent:#73ebd3}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 85% 0%,#172b36 0,transparent 45%),var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,'PingFang SC',sans-serif}a{color:var(--accent);text-underline-offset:4px}button,.action{font:inherit;min-height:44px;padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--ink);text-decoration:none;touch-action:manipulation;cursor:pointer}button[aria-pressed=true],button.selected{border-color:var(--accent);background:#19413f}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.primary{background:var(--accent);color:var(--bg);font-weight:600}.shell{max-width:1120px;margin:auto;padding:24px}.top{display:flex;justify-content:space-between;gap:16px;align-items:center;border-bottom:1px solid var(--line);padding-bottom:20px}.brand{font-size:23px;font-weight:750;text-decoration:none;color:var(--ink)}.brand span{color:var(--accent)}nav{display:flex;gap:8px;flex-wrap:wrap}nav a{color:var(--muted);padding:10px 14px;min-height:44px;text-decoration:none;border-radius:10px}nav a[aria-current=page]{background:#19413f;color:var(--accent)}h1{font-size:clamp(27px,4vw,42px);line-height:1.25;margin:12px 0 20px;letter-spacing:-.6px}h2{font-size:21px;line-height:1.45;margin:8px 0}p{margin:12px 0}.muted,small{color:var(--muted)}small{font-size:13px}.eyebrow{font-size:12px;color:var(--accent);letter-spacing:1px}.hero{padding:32px 0 24px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card,.panel{background:var(--panel);padding:20px;border:1px solid var(--line);border-radius:15px}.card{display:flex;flex-direction:column;gap:12px}.card p,.card h2{margin:0}.card .action{align-self:flex-start;margin-top:auto}.meta,.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.meta{justify-content:space-between;font-size:13px;color:var(--muted)}.row{margin:16px 0}.stack{display:grid;gap:10px;margin:18px 0}.stack button{text-align:left}.training{max-width:800px;margin:24px auto}.scenario{background:linear-gradient(135deg,#182e3a,#142130);padding:20px;border-radius:14px;margin:20px 0}.stepbar{display:flex;gap:8px;margin:18px 0 24px}.stepbar span{flex:1;height:5px;background:var(--line);border-radius:3px}.stepbar .past{background:var(--accent)}.feedback{border-left:3px solid var(--accent);background:#193936;padding:16px;border-radius:0 10px 10px 0;margin:18px 0}.feedback.wrong{border-color:#e5ba86;background:#322a23}.next{display:flex;justify-content:space-between;gap:12px;margin:22px 0}.next button{max-width:100%}.source{font-size:13px;color:var(--muted);margin:14px 0}.source a{display:inline-block;min-height:44px;padding:8px 0}.source summary,details summary{min-height:44px;padding:10px 0;cursor:pointer}.definition{padding:18px;border-left:3px solid var(--accent);background:#102b2e;margin:18px 0}.chip{display:inline-block;background:#213949;border-radius:8px;padding:5px 10px;margin:4px 5px 4px 0}.slot{padding:16px;border:1px dashed #527185;border-radius:12px;margin:12px 0;min-height:64px}.slot small{display:block}.score{font-size:30px;font-weight:650;font-variant-numeric:tabular-nums;color:var(--accent)}.score-row{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:10px}.score-row small{display:block}select{min-height:44px;max-width:100%;font:inherit;padding:8px;background:#0b1924;border:1px solid var(--line);border-radius:8px;color:var(--ink)}.pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}.pair button{min-height:88px;text-align:left}.pair strong,.pair small{display:block}.model-map{text-align:center;display:grid;gap:0;margin:24px 0}.map-node{padding:18px;background:var(--panel);border:1px solid var(--line);border-radius:12px}.arrow{color:var(--accent);padding:6px}.tree{margin:20px 0;text-align:center}.branches{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px;border-top:1px solid var(--line);padding-top:14px}.branches .panel{padding:12px}.connected{border-color:var(--accent)}.tree-target{width:100%;margin:4px 0}.points{font-size:20px;color:var(--accent);font-variant-numeric:tabular-nums}.principle{padding:22px;background:#163633;border-radius:14px}.attempt{font-size:13px;color:var(--muted)}footer{margin-top:40px;padding:20px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted);display:flex;gap:14px;align-items:center;flex-wrap:wrap}footer button{font-size:13px}dialog{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:15px;max-width:480px;width:calc(100% - 32px);padding:24px}dialog::backdrop{background:#000a}[hidden]{display:none!important}@media(max-width:600px){.shell{padding:16px}.top{flex-wrap:wrap}.top nav{width:100%;justify-content:space-between}.top nav a{padding:10px 8px}.cards,.grid{grid-template-columns:1fr}.hero{padding:24px 0 18px}.training{margin-top:20px}.card,.panel{padding:16px}.branches{grid-template-columns:1fr}.pair button{padding:12px}.row>*{max-width:100%}.score-row{grid-template-columns:1fr auto}.next{flex-wrap:wrap}.next .primary{margin-left:auto}.map-node{padding:15px}.stepbar{margin:12px 0 20px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

h1:focus{outline:none}hr{border:0;border-top:1px solid var(--line);margin:12px 0}
.quadrants{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}.quadrants button{text-align:left}.curve{margin:18px 0}.curve svg{display:block;width:100%;max-height:240px}.curve-labels{display:grid;grid-template-columns:repeat(4,1fr);text-align:center;font-size:13px}.allocation{display:flex;justify-content:space-between;align-items:center;margin:10px 0}.activity-flow{display:grid;gap:8px}.activity-flow .arrow{text-align:center}.quadrants .chip{display:block}h1:focus{outline:none}@media(max-width:400px){.quadrants{gap:8px}.quadrants button,.quadrants .map-node{padding:12px}.pair{grid-template-columns:1fr}}
.filters{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 24px}.filters .selected{background:#19413f;border-color:var(--accent);color:var(--accent)}.action{display:inline-flex;align-items:center;justify-content:center}a{overflow-wrap:anywhere}.hero .action{margin-top:8px}

@media(max-width:600px){.top nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px}.top nav a{font-size:13px;text-align:center;padding:10px 3px}}