:root{
  --bg:#f6f7fb;--panel:#ffffff;--panel-2:#fbfcff;--text:#111827;--muted:#6b7280;
  --border:#e5e7eb;--accent:#2563eb;--accent-2:#1d4ed8;--soft:#eef2ff;
  --radius:12px;--radius-sm:8px;--shadow:0 8px 24px rgba(16,24,40,.08);
  --shadow-sm:0 2px 8px rgba(16,24,40,.06);
}

*{box-sizing:border-box;}
html,body,#contenedor{scroll-behavior:smooth;}

body{
  margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}

/* Enlaces */
a{color:var(--accent);text-decoration:none;}
a:hover{text-decoration:underline;}

/* Titulares y texto */
h1,h2,h3,h4,p{margin:0;}
h1{font-size:22px;font-weight:700;letter-spacing:.2px;text-align:center;}
h2{font-size:18px;font-weight:600;}
h3{font-size:15px;font-weight:600;color:var(--muted);}
h4{
  font-size:12px;font-weight:700;color:var(--muted);
  letter-spacing:.4px;text-transform:uppercase;
}
p{width:auto;padding:0;}

.textos1{margin:0;}
.lugardatos{align-items:center;}

/* Labels y opciones (radios más pequeños y líneas más separadas) */
label{
  margin-right:10px;margin-bottom:6px;
  color:var(--muted);font-weight:500;
  display:inline-flex;align-items:center;
}
input[type="radio"]{
  width:14px;height:14px;margin-right:6px;
  accent-color:var(--accent);
}

/* Tablas / matrices */
td{text-align:right;}
table{
  border-collapse:separate;border-spacing:10px;
  font-size:14.5px;margin:0;padding:0;
}
table.matrix{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:10px 12px;box-shadow:var(--shadow-sm);
}

/* Inputs */
.inputCorto,.inputLargo,.inputMuyLargo{
  height:28px;border:1px solid var(--border);border-radius:6px;
  padding:0 6px;background:var(--panel);color:var(--text);outline:none;
}
.inputCorto{margin:0;width:28px;}
.inputLargo{width:110px;}
.inputMuyLargo{width:150px;}
.inputCorto:focus,.inputLargo:focus,.inputMuyLargo:focus{
  border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.12);
}

/* Botones (incluidos Calcular) alineados a la izquierda */
button,input[type="button"],input[type="submit"]{
  display:inline-flex;align-items:center;justify-content:flex-start;
  padding:6px 14px 6px 10px;margin:4px 8px 4px 0;
  border-radius:8px;border:1px solid var(--border);
  background:var(--panel-2);color:var(--text);cursor:pointer;
  font-size:13px;font-weight:600;
}
button:hover,input[type="button"]:hover,input[type="submit"]:hover{
  border-color:var(--accent);background:var(--soft);
}

/* Cabecera: título centrado, controles pegados a la derecha */
#tituloinicial{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:center;
  min-height:64px;padding:12px 22px;background:var(--panel);
  border-bottom:1px solid var(--border);
}
#tituloinicial h1{
  flex:0 1 auto;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
#controlesTop{
  position:absolute;right:22px;top:50%;
  transform:translateY(-50%);
  display:flex;align-items:center;gap:16px;
}

#abreVentana1{
  font-size:13px;font-weight:600;padding:6px 10px;
  background:var(--soft);border:1px solid transparent;border-radius:8px;
}
#abreVentana1:hover{background:#e0e7ff;text-decoration:none;}

/* Botón VOLVER */
#btnHome{
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;
  width:44px;height:48px;background:var(--panel-2);
  border:1px solid var(--border);border-radius:10px;
  text-decoration:none;gap:2px;box-shadow:var(--shadow-sm);
}
#btnHome:hover{border-color:#d1d5db;background:var(--panel);text-decoration:none;}
#btnHome span{
  font-size:9px;line-height:9px;color:var(--text);
  font-weight:700;letter-spacing:.35px;
}

/* Layout general */
#contenedor{
  width:100%;margin:0;padding:18px 22px 28px 22px;
  display:grid;grid-template-columns:1fr;gap:16px;
}

/* Dos columnas en pantallas grandes, sin sticky en caja1 */
@media (min-width:1100px){
  #contenedor{
    grid-template-columns:420px 1fr;align-items:flex-start;
  }
}

/* Tarjetas principales siempre separadas */
#caja1,#caja2{
  background:var(--panel);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow);
  padding:18px 20px;
}

/* Caja2 en columna para que caja21 pueda crecer con scroll propio */
#caja2{
  display:flex;flex-direction:column;align-items:stretch;min-height:0;
}

/* Cabecera de caja1 (Introducción de datos) */
#tituloCaja1{
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;font-weight:800;letter-spacing:.4px;
  text-transform:uppercase;color:var(--muted);
  padding-bottom:8px;border-bottom:1px dashed var(--border);
  margin-bottom:10px;
}
#caja111{margin-left:8px;font-size:12px;color:var(--muted);}

/* Caja2: operaciones del usuario */
#letreroUsuario{padding:2px 0;margin-bottom:8px;}

/* CAJA21: siempre 99% de ancho + scroll vertical propio + sin crecer hacia arriba */
#caja21{
  display:block !important;
  box-sizing:border-box;
  width:99% !important;
  max-width:99% !important;
  margin:6px auto 0 auto;
  height:calc(50vh - 120px);
  min-height:120px;
  overflow-y:auto;
  overflow-x:auto;
  padding:10px;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  background:var(--panel-2);
}
#caja21::after{
  content:"";display:block;clear:both;
}


/* Ventana modal de ayuda */
.ventana{
  display:none;position:fixed;inset:0;
  background-color:rgba(2,6,23,0.55);
  justify-content:center;align-items:center;z-index:1000;
  padding:18px;
}
.contenidoVentana{
  background:var(--panel);padding:18px 18px 14px 18px;
  border-radius:var(--radius);width:min(900px,94vw);
  text-align:center;position:relative;z-index:1001;
  border:1px solid var(--border);box-shadow:var(--shadow);
}
.cierraVentana{
  position:absolute;top:10px;right:12px;
  font-size:22px;cursor:pointer;color:var(--muted);
}
.cierraVentana:hover{color:var(--text);}
iframe{border:none;border-radius:10px;}

.tpasos td.exprCell{padding-right:14px!important;}
.tpasos td.calcCell{text-align:left!important;padding-left:14px!important;border-left:1px dashed #ddd!important;}
.tpasos td.calcCell .panelCalc{justify-content:flex-start!important;width:auto!important;}
.tpasos colgroup col:nth-child(3){width:24rem!important;min-width:24rem!important;max-width:24rem!important;}


.tpasos{table-layout:fixed!important;width:100%!important;}
.tpasos colgroup col:nth-child(1){width:6rem!important;}
.tpasos colgroup col:nth-child(2){width:55%!important;}
.tpasos colgroup col:nth-child(3){width:45%!important;}
.tpasos td.exprCell{max-width:0!important;overflow:hidden!important;text-overflow:ellipsis!important;padding-right:14px!important;}
.tpasos td.calcCell{text-align:left!important;padding-left:14px!important;border-left:1px dashed #ddd!important;}
.tpasos td.calcCell .panelCalc{justify-content:flex-start!important;width:auto!important;}

html,body{height:100%;}
body{min-height:100vh;display:flex;flex-direction:column;}
#contenedor{flex:1;}
footer{margin-top:auto;padding:14px 0;text-align:center;font-size:.95em;}
footer hr{margin:0 0 10px;border:0;border-top:1px solid var(--border);}
footer p{margin:0;}
footer a{text-decoration:none;}
footer a:hover{text-decoration:underline;}