:root{--bg:#f8fafc;--sf:#fff;--bd:#cbd5e1;--tx:#1e293b;--mu:#64748b;--ac:#7c3aed;--on:#fff;--er:#b45309}
@media(prefers-color-scheme:dark){:root{--bg:#0f172a;--sf:#1e293b;--bd:#334155;--tx:#e2e8f0;--mu:#94a3b8;--ac:#a78bfa;--on:#1e1b4b;--er:#fbbf24}}
*{box-sizing:border-box}
body{margin:0;font-family:'Latin Modern Roman','CMU Serif','STIX Two Text','Cambria','Times New Roman',serif;font-variant-numeric:lining-nums;background:var(--bg);color:var(--tx);padding-bottom:72px}
header{background:#1e293b;color:#fff;display:flex;justify-content:space-between;align-items:center;padding:10px 20px;padding-top:calc(10px + env(safe-area-inset-top,0px))}
header h1{font-size:1rem;margin:0}#segell{font:.65rem monospace;opacity:.6}
main{max-width:1100px;margin:0 auto;padding:20px 16px;display:grid;grid-template-columns:280px 1fr;gap:24px;align-items:start}
@media(max-width:860px){main{grid-template-columns:1fr}}
h2{font-size:.8rem;text-transform:uppercase;letter-spacing:.07em;color:var(--mu)}h3{font-size:.75rem;color:var(--mu);margin:14px 0 6px}
aside label{display:block;margin:6px 0}.fila{display:flex;gap:8px;align-items:center}
#onviuen{margin:6px 0}#onviuen label{display:inline-block;margin-right:10px}
input[type=number]{width:4rem;padding:6px;border:1px solid var(--bd);border-radius:6px;background:var(--sf);color:var(--tx)}
button{font:.75rem monospace;min-height:38px;padding:6px 12px;border:1px solid var(--ac);background:none;color:var(--ac);border-radius:5px;cursor:pointer}
button[aria-pressed=true],#baixa,#tot{background:var(--ac);color:var(--on)}
button:disabled{opacity:.4;cursor:not-allowed}
button:focus-visible,input:focus-visible{outline:2px solid var(--ac);outline-offset:2px}
.grup{display:flex;flex-wrap:wrap;gap:5px}
.carta{background:var(--sf);border:1px solid var(--bd);border-left:4px solid var(--ac);border-radius:8px;padding:12px 16px;margin-bottom:12px}
.cap{display:flex;gap:10px;align-items:center;font:.7rem monospace;color:var(--mu)}.cap button{min-height:30px;padding:2px 9px}
.cap .num{background:var(--ac);color:var(--on);padding:2px 8px;border-radius:3px;font-weight:600}.cap small{margin-left:auto}
.math{font-size:1.35rem;padding:10px 0;line-height:2;
 font-family:'Latin Modern Math','STIX Two Math','Cambria Math','Latin Modern Roman','Times New Roman',serif;
 font-variant-numeric:lining-nums tabular-nums}
/* Potència: s'enlaira sense alterar l'alçada de la línia */
.math sup{font-size:.62em;line-height:0;vertical-align:0;position:relative;top:-.75em;margin-left:.04em}
.pg{display:inline-flex;align-items:center}.pb{font-size:1.9em;font-weight:200;line-height:.7;margin:0 .03em}
.entorn{margin-top:20px;border-top:1px solid var(--bd);padding-top:12px}
.math .op{margin:0 var(--sop,.22em)}
.ext{font-size:.68rem;border:1px dashed var(--bd);border-radius:4px;padding:1px 6px}
.err{color:var(--er)}
.fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;font-size:.85em;margin:0 .15em}
.fr>span:first-child{border-bottom:1px solid;padding:0 .25em}
pre{overflow:auto;background:var(--sf);border:1px solid var(--bd);padding:10px;font-size:.75rem}
.avis{font-size:.72rem;color:var(--mu)}
footer{position:fixed;left:0;right:0;bottom:0;background:var(--sf);border-top:1px solid var(--bd);display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));font:.72rem monospace}
@media print{
 @page{size:A4;margin:2cm 1.8cm}
 header,aside,footer,details,.avis,h2,.cap button,.cap small{display:none!important}
 body{background:#fff;color:#000;padding:0}main{display:block;padding:0}
 .carta{border:0;background:none;padding:0;margin:0;break-inside:avoid;display:flex;gap:.6em}
 .cap{display:block}.cap .num{background:none;color:#000;font:700 1.1rem serif;padding:0}.cap .num::after{content:")"}
 .math{padding:0 0 var(--esp)}
}