:root{--bg:#f5f7fb;--panel:#ffffff;--ink:#111827;--muted:#6b7280;--accent:#2563eb;--accent-2:#0ea5a4;--border:#d1d5db;--soft:#eef2f7;--shadow:0 6px 18px rgba(0,0,0,.08);--radius:12px;--radius-sm:8px;--gap:10px;}
*{box-sizing:border-box}
body{margin:0;padding:0;background:linear-gradient(180deg,var(--bg),#ffffff);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,monospace;}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3,h4,p{margin:0}

#tituloinicial{position:sticky;top:0;z-index:10;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:0 2px 10px rgba(0,0,0,.04);display:flex;align-items:center;justify-content:space-between;gap:24px;padding:14px 18px;}
#tituloinicial h1{font-size:18px;font-weight:800;letter-spacing:.2px;line-height:1.2;flex:1;display:flex;justify-content:center;text-align:center;}
#controlesTop{display:flex;align-items:center;gap:18px}
.abreVentana{font-size:14px;font-weight:700;padding:8px 10px;border-radius:var(--radius-sm);background:var(--soft);border:1px solid var(--border);}
#btnHome{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;width:46px;height:50px;background:var(--soft);border:1px solid var(--border);border-radius:10px;gap:2px;transition:.15s transform,.15s background;}
#btnHome:hover{transform:translateY(-1px);background:#e9eef9}
#btnHome svg{display:block;fill:var(--ink)}
#btnHome span{font-size:9px;line-height:9px;color:var(--ink);font-weight:800;letter-spacing:.5px}

#contenedor{height:calc(100vh - 76px - var(--footer-h,74px));width:100%;padding:var(--gap);display:flex;flex-direction:column;gap:var(--gap);overflow-y:auto;overflow-x:hidden;scrollbar-width:none;-ms-overflow-style:none;}
#contenedor::-webkit-scrollbar{display:none;}
#caja1{display:flex;gap:var(--gap);width:100%;min-height:290px;flex:0 0 auto;}
#caja11,#caja12{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:10px;flex:1;min-width:0;}

#caja111{display:flex;gap:var(--gap);align-items:stretch;margin-bottom:8px;}
#caja1111{width:38%;min-width:220px;background:linear-gradient(135deg,#0f172a,#1f2937);color:#fff;border-radius:var(--radius-sm);border:1px solid #0b1020;padding:10px;display:flex;flex-direction:column;justify-content:space-between;}
#caja11111{display:flex;justify-content:center;align-items:center;text-align:center;font-size:14px;font-weight:800;letter-spacing:.6px;opacity:.95;}
#caja11112{margin-top:8px;font-size:11px;font-weight:700;color:#dbeafe;line-height:1.25;min-height:22px;}
#caja1112{flex:1;background:var(--soft);border:1px dashed var(--border);border-radius:var(--radius-sm);display:flex;justify-content:space-around;align-items:center;padding:8px;min-width:0;}
#caja11121,#caja11122{display:flex;align-items:center;gap:6px;flex-wrap:wrap;}

#caja112{display:flex;gap:var(--gap);align-items:center;min-height:190px;}

#caja1121,#caja1122{background:linear-gradient(180deg,#ffffff,var(--soft));border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px;flex:1;min-width:0;display:block;}
#caja11212{display:flex;align-items:center;justify-content:center;flex-wrap:nowrap;overflow-x:auto;max-width:100%;}

#caja121{display:flex;align-items:center;justify-content:center;margin-bottom:8px;}
#caja121 h3{font-size:15px;font-weight:800;color:var(--ink);padding:6px 10px;border-radius:var(--radius-sm);background:var(--soft);border:1px solid var(--border);}

#caja122{background:var(--soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px;font-size:13px;margin-bottom:8px;}
#caja1221,#caja1222,#caja1223{display:flex;align-items:center;gap:8px;padding:6px 4px;border-bottom:1px solid #e5e7eb;}
#caja1223{border-bottom:0;margin-bottom:2px}
#caja1224{display:flex;justify-content:flex-end;padding-top:6px}

#caja123{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px;font-size:13px;margin-bottom:8px;min-height:56px;}
#caja1231,#caja1232,#caja1233{display:flex;align-items:center;gap:8px;padding:4px 0;}

#caja124b{display:flex;justify-content:flex-end;gap:8px;align-items:center;padding:2px 0 8px 0;}
#caja1241{width:60%;color:var(--muted);font-size:12px;font-weight:700}
#caja1242{width:38%}

#caja125{display:flex;justify-content:space-between;align-items:center;gap:8px;border-top:1px solid #e5e7eb;padding-top:8px;}
#caja1251{font-size:12px;font-weight:800;color:#b91c1c;min-height:18px}
#caja1252{display:flex;justify-content:flex-end;gap:8px}

#caja2borde{background:transparent;flex:1;min-height:0;display:block;}
#caja2{height:100%;overflow:hidden;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:10px;display:flex;flex-direction:column;gap:var(--gap);}

h4{font-size:12px;font-weight:900;color:var(--muted);letter-spacing:.6px;text-transform:uppercase;margin:6px 0 4px 0;display:block;}
#caja21{flex:1;min-height:0;border:1px solid var(--border);border-radius:var(--radius-sm);background:linear-gradient(180deg,#fff,var(--soft));margin:0;padding:8px;display:flex;flex-wrap:wrap;align-items:center;align-content:flex-start;gap:6px;overflow-x:auto;overflow-y:auto;}
#caja22{flex:1;min-height:0;border:1px solid var(--border);border-radius:var(--radius-sm);background:linear-gradient(180deg,#fff,var(--soft));padding:8px;display:flex;flex-direction:column;}
#caja221{flex:1;min-height:0;display:flex;flex-direction:column;}
#caja221>div:not(#tiraAuto):not(#tiraAutoScroll){height:auto!important;margin:0!important;}
#caja222{flex-shrink:0;}
#tiraAutoScroll{scrollbar-width:auto;scrollbar-color:var(--muted) var(--soft);}
#tiraAutoScroll::-webkit-scrollbar{width:10px;height:10px;}
#tiraAutoScroll::-webkit-scrollbar-track{background:var(--soft);border-radius:4px;}
#tiraAutoScroll::-webkit-scrollbar-thumb{background:var(--muted);border-radius:4px;}
#tiraAutoScroll::-webkit-scrollbar-thumb:hover{background:var(--ink);}
#caja21>div{height:auto!important;margin:0!important;}
#caja222{height:auto;display:flex;justify-content:flex-start;padding-top:8px;border-top:1px solid var(--border);margin-top:8px;}

table{table-layout:auto;border-spacing:4px;font-size:12px;margin:0;padding:0}
td{padding:0 3px;text-align:right}
input{width:52px;padding:4px 6px;border:1px solid var(--border);border-radius:6px;background:#fff;font-weight:700;color:var(--ink);outline:none;transition:border-color .12s,box-shadow .12s;}
input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
label{margin-right:6px;font-size:12px;font-weight:700;}

button{appearance:none;border:1px solid var(--border);background:var(--soft);padding:7px 10px;border-radius:8px;font-weight:800;font-size:12px;cursor:pointer;transition:.12s transform,.12s background,.12s border-color;}
button:hover{transform:translateY(-1px);background:#e9eef9;border-color:#c7d2fe}
button:active{transform:translateY(0)}
#botonautomatico{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#fff;border-color:transparent;}
#botonautomatico:hover{filter:brightness(1.03)}

.ventana{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,0.55);justify-content:center;align-items:center;z-index:1000;padding:14px;}
.contenidoVentana{background:#fff;padding:18px;border-radius:var(--radius);width:min(900px,92vw);text-align:center;position:relative;box-shadow:0 18px 50px rgba(0,0,0,.22);}
.contenidoVentana h2{font-size:18px;font-weight:900;margin-bottom:10px}
.cierraVentana{position:absolute;top:10px;right:12px;font-size:22px;cursor:pointer;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--soft);border:1px solid var(--border);}
iframe{border:none}

#caja21 .katex, #caja221 .katex {font-size:13px;}
#caja11212 .katex {font-size:13px;}
/* Espaciado extra entre filas de matrices con fracciones */
#caja21 .katex .mtd, #caja221 .katex .mtd { padding-top:5px; padding-bottom:5px; }

/* Augmented matrix separator */
.aug-sep{font-size:24px;font-weight:300;color:var(--muted);margin:0 4px;align-self:center;}

/* Result box */
.inv-result-box{background:linear-gradient(135deg,#eff6ff,#f0fdf4);border:1px solid #bfdbfe;border-radius:10px;padding:12px 16px;margin-top:10px;display:inline-block;}
.inv-result-box .inv-label{font-size:11px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:6px;}
.inv-result-box .inv-mat{display:flex;align-items:center;justify-content:center;}

/* Singular matrix alert */
.inv-singular{background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:10px 14px;color:#b91c1c;font-size:13px;font-weight:700;}

@media (max-width:1100px){
  #caja112{flex-direction:column;}
}
@media (max-width:700px){
  #tituloinicial{flex-direction:column;align-items:stretch;padding:8px 12px;}
  #controlesTop{justify-content:flex-end;}
  #tituloinicial h1{font-size:15px;text-align:left;justify-content:flex-start;}
  #caja111{flex-direction:column;}
  #caja1111{width:100%;min-width:0;}
  #caja11212{flex-wrap:wrap;}
}