:root {
  --navy: #0f2742; --navy2: #183a5f; --ambar: #f2a93b; --azul: #2563eb;
  --fondo: #f3f5f9; --card: #fff; --borde: #e2e8f0; --tinta: #1b2a3a; --suave: #64748b;
  --ok: #059669; --mal: #dc2626; --aviso: #b45309;
  --r: 12px; --sombra: 0 1px 2px rgba(15, 39, 66, .06), 0 4px 16px rgba(15, 39, 66, .05);
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 15px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; color: var(--tinta); background: var(--fondo); }

/* ---------- cabecera ---------- */
.cabecera { background: linear-gradient(120deg, var(--navy), var(--navy2)); color: #fff; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.marca { display: flex; gap: 12px; align-items: center; }
.marca h1 { margin: 0; font-size: 20px; letter-spacing: .3px; }
.marca p { margin: 0; font-size: 13px; opacity: .75; }
.motor { display: flex; align-items: center; gap: 8px; font-size: 13px; background: rgba(255, 255, 255, .1); padding: 6px 12px; border-radius: 99px; }
.motor .punto { width: 9px; height: 9px; border-radius: 50%; background: var(--ambar); animation: latido 1.2s infinite; }
.motor.listo .punto { background: #34d399; animation: none; }
.motor.fallo .punto { background: #f87171; animation: none; }
.motor .barra { width: 70px; height: 4px; border-radius: 4px; background: rgba(255, 255, 255, .2); overflow: hidden; }
.motor .barra span { display: block; height: 100%; width: 0; background: var(--ambar); transition: width .4s; }
.motor.listo .barra { display: none; }
@keyframes latido { 50% { opacity: .35; } }

/* ---------- pestañas ---------- */
.pestanas { display: flex; gap: 4px; padding: 0 20px; background: var(--navy2); overflow-x: auto; scrollbar-width: none; position: sticky; top: 0; z-index: 5; }
.pestanas::-webkit-scrollbar { display: none; }
.pestana { display: flex; align-items: center; gap: 8px; border: 0; background: transparent; color: #cbd5e1; padding: 11px 16px; font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; white-space: nowrap; border-bottom: 3px solid transparent; }
.pestana svg { opacity: .85; }
.pestana:hover { color: #fff; }
.pestana[aria-selected="true"] { color: #fff; border-bottom-color: var(--ambar); }

main { max-width: 1480px; margin: 0 auto; padding: 20px; }
.tab { display: none; }
.tab.activa { display: block; }
.tab-intro { margin: 0 0 14px; color: var(--suave); font-size: 14px; }
.tab-intro b { color: var(--tinta); }
.disposicion { display: grid; grid-template-columns: minmax(330px, 410px) 1fr; gap: 20px; align-items: start; }
@media (max-width: 980px) { .disposicion { grid-template-columns: 1fr; } }

/* ---------- formulario ---------- */
.entrada { background: var(--card); border: 1px solid var(--borde); border-radius: var(--r); box-shadow: var(--sombra); padding: 16px; position: sticky; top: 58px; max-height: calc(100vh - 76px); overflow: auto; }
@media (max-width: 980px) { .entrada { position: static; max-height: none; } }
.entrada h2 { margin: 0 0 10px; font-size: 16px; }
.ejemplos { width: 100%; margin-bottom: 12px; }
fieldset { border: 1px solid var(--borde); border-radius: 10px; padding: 10px 12px 12px; margin: 0 0 12px; }
legend { font-size: 12px; font-weight: 700; color: var(--suave); text-transform: uppercase; letter-spacing: .5px; padding: 0 4px; }
.campo { display: flex; flex-direction: column; gap: 3px; margin-bottom: 8px; min-width: 0; }
.campo > span { font-size: 12.5px; color: var(--suave); font-weight: 600; }
.campo > span i { font-style: normal; font-weight: 400; opacity: .8; }
.fila { display: grid; grid-template-columns: repeat(auto-fit, minmax(90px, 1fr)); gap: 8px; }
input[type=text], select, textarea { font: 14px var(--mono); color: var(--tinta); border: 1px solid #cfd8e3; border-radius: 8px; padding: 7px 9px; background: #fbfcfe; width: 100%; min-width: 0; }
select { font-family: inherit; }
textarea { resize: vertical; min-height: 58px; }
input:focus, select:focus, textarea:focus { outline: 2px solid #93c5fd; border-color: var(--azul); background: #fff; }
.chips { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 2px; }
.chip { font: 12px var(--mono); background: #eef2f8; border: 1px solid #dbe3ee; color: var(--navy2); padding: 2px 8px; border-radius: 99px; cursor: pointer; }
.chip:hover { background: #dfe8f5; }
.chk { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--suave); cursor: pointer; }
.lista-cargas { display: flex; flex-direction: column; gap: 8px; }
.carga { border: 1px dashed #cbd5e1; border-radius: 9px; padding: 8px; background: #fafbfd; position: relative; }
.carga .tipo { font-size: 12px; font-weight: 700; color: var(--navy2); margin-bottom: 4px; display: block; }
.carga .quitar, .tramo .quitar { position: absolute; top: 4px; right: 6px; border: 0; background: none; color: #94a3b8; font-size: 17px; cursor: pointer; line-height: 1; }
.carga .quitar:hover, .tramo .quitar:hover { color: var(--mal); }
.agregar { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.btn-sec { font: 600 12px system-ui; border: 1px solid #cbd5e1; background: #fff; color: var(--navy2); padding: 5px 9px; border-radius: 7px; cursor: pointer; }
.btn-sec:hover { background: #f1f5f9; }
.tramos { display: flex; flex-direction: column; gap: 6px; }
.tramo { display: grid; grid-template-columns: 1fr 62px 62px 20px; gap: 6px; align-items: center; position: relative; }
.tramo .quitar { position: static; }
.tramos-cab { display: grid; grid-template-columns: 1fr 62px 62px 20px; gap: 6px; font-size: 11.5px; color: var(--suave); font-weight: 600; }
.btn { font: 700 15px system-ui; width: 100%; border: 0; border-radius: 10px; padding: 12px; background: var(--azul); color: #fff; cursor: pointer; display: flex; justify-content: center; align-items: center; gap: 8px; box-shadow: 0 2px 8px rgba(37, 99, 235, .25); }
.btn:hover { background: #1d4ed8; }
.btn:disabled { background: #94a3b8; box-shadow: none; cursor: progress; }
.btn .giro { width: 16px; height: 16px; border: 2.5px solid #fff6; border-top-color: #fff; border-radius: 50%; animation: gira .8s linear infinite; display: none; }
.btn.ocupado .giro { display: inline-block; }
@keyframes gira { to { transform: rotate(360deg); } }
.cancelar { display: none; margin-top: 6px; text-align: center; font-size: 13px; }
.cancelar.ver { display: block; }
.link { border: 0; background: none; color: var(--azul); cursor: pointer; font: inherit; text-decoration: underline; padding: 0; }
.oculto { display: none !important; }
.radio-grupo { display: flex; gap: 6px; margin-bottom: 10px; }
.radio-grupo label { flex: 1; border: 1px solid #cfd8e3; border-radius: 8px; padding: 7px; text-align: center; font-size: 13px; font-weight: 600; cursor: pointer; color: var(--suave); }
.radio-grupo input { display: none; }
.radio-grupo label:has(input:checked) { border-color: var(--azul); color: var(--azul); background: #eff6ff; }

/* ---------- salida ---------- */
.salida { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.card { background: var(--card); border: 1px solid var(--borde); border-radius: var(--r); box-shadow: var(--sombra); padding: 14px 16px; min-width: 0; }
.card > h3 { margin: 0 0 10px; font-size: 14px; text-transform: uppercase; letter-spacing: .6px; color: var(--suave); display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.card > h3 .acciones { text-transform: none; letter-spacing: 0; display: flex; gap: 6px; }
.vacio { text-align: center; padding: 50px 20px; color: var(--suave); border: 2px dashed #d5dde8; border-radius: var(--r); background: #fafbfd; }
.vacio svg { opacity: .5; margin-bottom: 8px; }
.avisos:empty { display: none; }
.aviso { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; padding: 9px 12px; border-radius: 9px; font-size: 13.5px; margin-bottom: 6px; }
.error { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; padding: 12px 14px; border-radius: 10px; font-size: 14px; }
.lienzo { display: block; width: 100%; border-radius: 8px; touch-action: pan-y; }
.controles { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-bottom: 8px; font-size: 13px; color: var(--suave); }
.controles label { display: flex; align-items: center; gap: 6px; }
.controles input[type=range] { width: 110px; accent-color: var(--azul); }
.controles select { width: auto; font-size: 13px; padding: 4px 6px; }
.controles .nota { flex-basis: 100%; font-size: 12.5px; }
.btn-mini { display: inline-flex; align-items: center; gap: 5px; font: 600 13px system-ui; border: 1px solid #cbd5e1; background: #fff; color: var(--navy2); padding: 5px 11px; border-radius: 8px; cursor: pointer; }
.btn-mini:hover { background: #f1f5f9; }
.sub-graf { margin-top: 6px; }
.resumen { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 10px; }
.dato { background: #f8fafc; border: 1px solid #e8edf3; border-radius: 9px; padding: 8px 10px; min-width: 0; }
.dato .k { font-size: 12px; color: var(--suave); font-weight: 600; }
.dato .v { font-size: 16px; font-weight: 700; color: var(--navy); overflow-x: auto; }
.dato .u { font-size: 11.5px; color: var(--suave); }
.graficas { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: 12px; }
.grafica { min-width: 0; position: relative; }
.g-titulo { font-size: 13px; font-weight: 700; color: var(--tinta); }
.g-lectura { font: 11.5px var(--mono); color: var(--suave); min-height: 16px; }
.tiempo-ms { font-size: 12px; font-weight: 400; color: var(--suave); text-transform: none; letter-spacing: 0; }

/* ---------- solucionario ---------- */
.pasos { counter-reset: paso; display: flex; flex-direction: column; gap: 10px; }
.paso { border: 1px solid #e8edf3; border-radius: 10px; padding: 10px 14px 12px; background: #fcfdfe; }
.paso > h4 { margin: 0 0 4px; font-size: 15px; display: flex; gap: 10px; align-items: center; cursor: pointer; }
.paso > h4::before { counter-increment: paso; content: counter(paso); flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--navy); color: #fff; font-size: 12.5px; display: grid; place-items: center; }
.paso.cerrado .cuerpo { display: none; }
.paso .texto { color: #334155; font-size: 14px; margin: 2px 0 6px 34px; }
.paso .ec { overflow-x: auto; overflow-y: hidden; padding: 4px 0 4px 34px; }
.paso .ec .katex-display { margin: .35em 0; text-align: left; }
.paso .ec .katex-display > .katex { text-align: left; }
.ec-cruda { font: 12px var(--mono); white-space: pre-wrap; color: #7c2d12; }
.katex { font-size: 1.06em; }

/* ---------- pie y diálogo ---------- */
.pie { max-width: 1480px; margin: 0 auto; padding: 8px 20px 30px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: var(--suave); font-size: 12.5px; }
.dialogo { border: 0; border-radius: 14px; padding: 22px 24px; max-width: 640px; box-shadow: 0 20px 60px rgba(0, 0, 0, .25); }
.dialogo::backdrop { background: rgba(15, 39, 66, .45); }
.dialogo h2 { margin-top: 0; }
.dialogo table { border-collapse: collapse; font-size: 14px; width: 100%; }
.dialogo td { border-bottom: 1px solid var(--borde); padding: 6px 8px; vertical-align: top; }
.dialogo .btn { width: auto; padding: 9px 20px; margin-top: 8px; }
code { font: 13px var(--mono); background: #eef2f8; padding: 1px 5px; border-radius: 5px; }

@media print {
  .cabecera, .pestanas, .entrada, .card-anim, .card-graf, .pie, .controles, .acciones { display: none !important; }
  body { background: #fff; }
  .disposicion { display: block; }
  .card { box-shadow: none; border: 0; padding: 0; }
  .paso { break-inside: avoid; }
  .paso.cerrado .cuerpo { display: block; }
}
.tabla-coef { border-collapse: collapse; font: 12.5px var(--mono); width: 100%; margin-top: 6px; }
.tabla-coef th, .tabla-coef td { border-bottom: 1px solid var(--borde); padding: 3px 8px; text-align: right; }
.tabla-coef th { color: var(--suave); font-family: system-ui; }