:root{--bg:#f2f4ec;--panel:#fff;--ink:#183d30;--muted:#60766a;--line:#d5e2d6;--green:#236c49;--arena:#e8efe4}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,sans-serif}main{max-width:900px;margin:auto;padding:24px}header{margin-bottom:24px}.brand{font-weight:850;letter-spacing:.12em;font-size:13px}.brand span{font-size:9px;background:#e6d9ae;color:#5f4b18;padding:6px;margin-left:8px}h1{font-size:clamp(28px,5vw,40px);letter-spacing:-.04em;margin:16px 0 4px}header p{color:var(--muted);margin:0}button,select{font:inherit}button{cursor:pointer;background:var(--panel);color:var(--ink);border:1px solid var(--line);padding:10px 16px;border-radius:10px}button:focus-visible,select:focus-visible{outline:3px solid #c58c24;outline-offset:3px}.primary{background:var(--green);color:#fff;font-weight:750;border:0;padding:15px 25px}#end,#intro{background:var(--panel);padding:26px;border-radius:18px;line-height:1.6}#intro h2{font-size:23px}li{margin:10px 0}.note{font-size:12px;color:var(--muted);line-height:1.6}.hud{display:grid;grid-template-columns:repeat(3,1fr);background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px;text-align:center;font-size:10px;letter-spacing:.1em;margin-bottom:18px}.hud strong{display:block;font-size:26px;margin-top:5px;letter-spacing:0}#lives{color:#b64159}.round{display:flex;justify-content:space-between;align-items:center;font-size:12px}.prompt{text-align:center;min-height:115px;padding:12px}.prompt h2{font-size:clamp(19px,3.3vw,29px);margin:8px 0;overflow-wrap:anywhere}.prompt span{color:var(--muted);font-size:12px}#arena{height:clamp(260px,45vh,430px);background:var(--arena);border-radius:18px;border:1px solid var(--line);position:relative;overflow:hidden;background-image:linear-gradient(#7e9d8210 1px,transparent 1px);background-size:100% 40px}#cards{position:absolute;top:0;left:0;width:100%;display:grid;gap:10px;padding:10px;will-change:transform}.formula{background:var(--panel);box-shadow:0 6px 14px #183d3010;min-height:74px;padding:12px 4px;border:2px solid var(--line);font-size:clamp(16px,2.7vw,25px);font-weight:700;overflow-wrap:anywhere;line-height:1.4}.formula small{display:block;font-size:10px;color:var(--muted);margin-top:5px;font-weight:500}.formula:hover{border-color:var(--green)}.floor{position:absolute;bottom:0;height:25px;border-top:2px dashed #b36d4b;width:100%;text-align:center;color:#955638;font-size:9px;letter-spacing:.15em;padding:5px;pointer-events:none}#overlay{position:fixed;inset:0;background:#0e211ba6;display:flex;align-items:center;justify-content:center;padding:20px;z-index:20}#overlay section{background:var(--panel);border-radius:22px;padding:28px;width:440px;max-width:100%;text-align:center;max-height:90vh;overflow:auto}#message{line-height:1.7;margin:20px 0}#message .answer{font-size:34px;font-weight:750}#message p{margin:6px 0}details{margin-top:22px;border-top:1px solid var(--line);padding-top:16px;font-size:13px}summary{cursor:pointer}label{display:block;margin:12px 0 8px}select{padding:10px;width:100%;margin-bottom:10px;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:8px}[hidden]{display:none!important}.theme-dark{color-scheme:dark;--bg:#12241c;--panel:#1d3528;--ink:#e6f3e9;--muted:#b3cbb9;--line:#486550;--green:#307c50;--arena:#162c20}.theme-dark #lives{color:#ff9eb0}.theme-dark .floor{color:#e4b697}@media(max-width:520px){main{padding:14px}header{margin-bottom:16px}.hud{padding:12px}.hud strong{font-size:22px}#intro{padding:20px}#cards{gap:5px;padding:6px}.formula{font-size:17px;min-height:68px}.prompt{min-height:105px}#arena{height:37vh;min-height:250px}.round{font-size:11px}h1{font-size:28px}}