:root{
  --ink:#13213c; --muted:#64748b; --paper:#f7f9fc; --card:#ffffff; --line:#d9e1ec;
  --accent:#315f9c; --accent2:#7652a3; --good:#2f7d5a; --warn:#b56a13; --bad:#a51c30;
  --soft:#edf3fa; --gold:#c49a3a; --cyan:#2e8594;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.55}
a{color:inherit}
.container{width:min(1180px,calc(100% - 32px));margin:auto}
.site-header{background:#101b32;color:white;border-bottom:1px solid rgba(255,255,255,.08)}
.nav-shell{min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:750}
.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:10px;background:white;color:#a51c30;font-weight:900}
.site-nav{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.site-nav a{padding:8px 10px;border-radius:8px;text-decoration:none;color:#dbe5f2;font-size:14px}
.site-nav a:hover,.site-nav a.active{background:rgba(255,255,255,.11);color:white}
.hero{background:linear-gradient(135deg,#17294b,#253c68);color:white;padding:42px 0 38px}
.hero .kicker{margin:0 0 8px;text-transform:uppercase;letter-spacing:.12em;font-size:12px;color:#c8d5e8;font-weight:800}
.hero h1{margin:0 0 10px;font-size:clamp(32px,5vw,58px);line-height:1.02;letter-spacing:-.03em}
.hero p{max-width:850px;margin:0;color:#dbe5f2;font-size:17px}
.pills,.legend,.button-row{display:flex;gap:8px;flex-wrap:wrap}
.pills{margin-top:18px}
.pill{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.15);font-size:13px}
main{padding:28px 0 46px}
.notice,.prompt,.callout,.status{border-radius:12px;padding:14px 16px}
.notice{background:#eef4fb;border:1px solid #cfdef1}
.prompt{background:#fff8df;border-left:5px solid var(--gold);margin-bottom:18px;font-size:17px}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.card,.panel{background:var(--card);border:1px solid var(--line);border-radius:16px}
.card{padding:20px}
.card h2{margin:4px 0 8px;font-size:22px}
.card p{margin:0 0 14px;color:#4d5d74}
.card .meta{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:800}
.card-link{display:inline-block;text-decoration:none;color:white;background:var(--accent);padding:9px 13px;border-radius:9px;font-weight:750}
.activity-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,.75fr);gap:18px;align-items:start}
.panel{padding:18px;min-width:0}
.panel h2{margin:0 0 12px;font-size:20px}
.panel h3{margin:20px 0 8px;font-size:16px}
.controls{position:sticky;top:14px}
.control{margin:0 0 14px}
.control label{display:flex;justify-content:space-between;gap:12px;font-size:14px;font-weight:750;margin-bottom:6px}
.control input[type=range]{width:100%}
.control select,.control input[type=number],.control input[type=text],textarea{width:100%;font:inherit;padding:9px 10px;border:1px solid #becadd;border-radius:9px;background:white;color:var(--ink)}
.btn{border:0;border-radius:9px;padding:10px 13px;background:var(--accent);color:white;font:inherit;font-weight:750;cursor:pointer}
.btn:hover{filter:brightness(.95)}
.btn.secondary{background:#e8eef6;color:var(--ink);border:1px solid #cbd6e5}
.btn.good{background:var(--good)}
.btn.warn{background:var(--warn)}
.btn.bad{background:var(--bad)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.canvas-wrap{width:100%;overflow:auto;border:1px solid #e2e8f0;border-radius:12px;background:white}
canvas{display:block;width:100%;height:auto;min-width:520px}
.stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:12px 0}
.stat{border:1px solid var(--line);border-radius:12px;padding:12px;background:#fafcff;min-width:0}
.stat .label{display:block;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.05em}
.stat .num{display:block;font-size:25px;font-weight:850;letter-spacing:-.02em;overflow-wrap:anywhere}
.callout{background:#f7f9fc;border:1px solid var(--line);margin:10px 0}
.status{margin-top:12px;border:1px solid var(--line);background:#f7f9fc}
.status.good{background:#edf8f1;border-color:#b7dec6}
.status.warn{background:#fff8e9;border-color:#ecd19c}
.status.bad{background:#fff0f1;border-color:#e5b9bf}
.status.neutral{background:#f7f9fc}
.legend{margin:10px 0;color:#526176;font-size:13px}
.legend span{display:flex;align-items:center;gap:5px}
.swatch{display:inline-block;width:11px;height:11px;border-radius:3px}
.metric-table{border-collapse:collapse;width:100%;font-size:14px}
.metric-table th,.metric-table td{padding:8px 9px;border-bottom:1px solid #e6ebf2;text-align:right;white-space:nowrap}
.metric-table th:first-child,.metric-table td:first-child{text-align:left}
.metric-table tr.selected{background:#edf4fb}
.metric-table button{font:inherit;border:1px solid #bac7d8;background:white;border-radius:7px;padding:5px 8px;cursor:pointer}
.reveal{margin-top:14px;border:1px solid var(--line);border-radius:12px;background:white}
.reveal summary{cursor:pointer;padding:12px 14px;font-weight:800}
.reveal-body{padding:0 14px 14px;color:#45566d}
.small{font-size:13px;color:var(--muted)}
.hr{height:1px;background:#e2e8f0;margin:16px 0}
.bar{height:16px;border-radius:999px;background:#e8edf4;overflow:hidden}
.bar>span{display:block;height:100%;border-radius:999px}
.score-row{display:grid;grid-template-columns:110px 1fr 75px;gap:10px;align-items:center;margin:8px 0;font-size:14px}
.coin-row{display:flex;gap:6px;flex-wrap:wrap;min-height:44px;margin:10px 0}
.coin{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:850;border:1px solid #c2ccda;background:#edf2f7}
.coin.h{background:#e9f4fb;color:#235f86}.coin.t{background:#f7edf8;color:#70437d}
.feature-list{display:grid;gap:8px}
.feature{display:grid;grid-template-columns:minmax(120px,1fr) auto auto;gap:8px;align-items:center;border:1px solid var(--line);padding:9px;border-radius:10px}
.token-bank{display:flex;gap:7px;flex-wrap:wrap;margin:10px 0}
.token{border:1px solid #c4cfdd;border-radius:999px;background:white;padding:6px 10px;cursor:pointer;font:inherit}
.token.active{background:#e8eef6;border-color:#8aa2c2}
.posterior-strip{height:22px;display:flex;border-radius:999px;overflow:hidden;background:#e8edf4;margin:8px 0}
.posterior-strip span{display:grid;place-items:center;color:white;font-size:12px;font-weight:800;min-width:0}
.footer{border-top:1px solid var(--line);padding:22px 0 35px;color:#718096;font-size:13px}
.code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f2f5f9;padding:2px 5px;border-radius:5px}
.step-list{counter-reset:steps;display:grid;gap:10px}
.step{display:grid;grid-template-columns:34px 1fr;gap:9px;align-items:start}
.step:before{counter-increment:steps;content:counter(steps);width:30px;height:30px;display:grid;place-items:center;background:#e8eef6;border-radius:50%;font-weight:850}
@media(max-width:900px){.activity-layout{grid-template-columns:1fr}.controls{position:static}.site-nav{display:none}.grid{grid-template-columns:1fr}}
@media(max-width:520px){.container{width:min(100% - 20px,1180px)}.hero{padding:30px 0}.panel,.card{padding:14px}.stat-grid{grid-template-columns:1fr}.score-row{grid-template-columns:90px 1fr 62px}.feature{grid-template-columns:1fr 1fr}.feature span:first-child{grid-column:1/-1}}