/*
 * Estilos comunes de las simulaciones de Álgebra (matrices-determinantes y
 * sistemas-lineales), encima del kit (sim-kit.css). Escena de texto oscura:
 * todo con los tokens de la escena (--stage-*, --serie-*).
 */
.oculto { display: none !important; }

/* ── Vista de la escena: paneles en columna ───────────────────── */
.al-vista { display: flex; flex-direction: column; gap: 14px; max-width: 1100px; margin: 0 auto; }
.al-vista > .sk-panel, .al-fila > .sk-panel { min-width: 0; }
.al-fila { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; }
.al-texto { font-size: 13px; line-height: 1.55; color: var(--stage-text); }
.al-tenue { color: var(--stage-faint); }
.al-grande { font-size: 18px; font-weight: 700; line-height: 1.35; color: var(--serie-1); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.al-nota { margin: 8px 0 0; font-size: 11.5px; line-height: 1.5; color: var(--stage-faint); }
.al-mono { font-variant-numeric: tabular-nums; }
.sk-panel-titulo { overflow-wrap: anywhere; }

/* Escena «de abajo» (en móvil, los resultados van después de los controles) */
.al-escena-abajo[hidden] { display: none; }
@media (max-width: 620px) {
  .al-escena-abajo { border-top: 1px solid var(--border); }
}

/* ── Matrices con corchetes dibujados ─────────────────────────── */
.mat { display: inline-flex; align-items: stretch; gap: .18rem; vertical-align: middle; font-variant-numeric: tabular-nums; color: var(--stage-text); }
.mat .cor { width: .5rem; border: 1.6px solid var(--stage-faint); }
.mat .cor.izq { border-right: none; border-radius: .28rem 0 0 .28rem; }
.mat .cor.der { border-left: none; border-radius: 0 .28rem .28rem 0; }
.mat.det .cor { width: 0; border-radius: 0; border-left: 1.6px solid var(--stage-faint); border-right: none; }
.mat .cuerpo { display: grid; gap: .1rem .55rem; padding: .28rem .18rem; }
/* Ni la matriz ni sus columnas se encogen: con min-width en las celdas, una
   columna podría quedarse más estrecha que su texto y pisar a la siguiente */
.mat, .mat > .cor, .mat > .cuerpo { flex: none; }
.mat .cuerpo > span { text-align: right; font-size: 14px; min-width: 1.6rem; white-space: nowrap; }
.mat .cuerpo > span.barra { border-left: 1.4px solid var(--stage-faint); padding-left: .55rem; margin-left: -.1rem; }
.mat .cuerpo > span.cambia { color: var(--serie-2); font-weight: 700; }
.mat.chica .cuerpo > span { font-size: 12.5px; min-width: 1.2rem; }
.mat .vacio { color: var(--stage-faint); font-style: italic; }
.conj { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.conj .eq { color: var(--stage-faint); font-weight: 600; }
.chip-e {
  display: inline-block; border-radius: 99px; padding: 2px 9px; font-size: 11.5px; font-weight: 700;
  color: var(--stage-text); background: color-mix(in srgb, var(--stage-text) 7%, transparent); border: 1px solid var(--stage-line);
  font-variant-numeric: tabular-nums;
}

/* ── Lista de pasos numerados ─────────────────────────────────── */
.paso { display: grid; grid-template-columns: 22px 1fr; gap: 8px; align-items: start; padding: 6px 0; border-bottom: 1px dashed var(--stage-line); font-size: 13px; line-height: 1.5; color: var(--stage-text); }
.paso:last-child { border-bottom: none; }
.paso .num { width: 20px; height: 20px; border-radius: 50%; border: 1px solid var(--stage-line); color: var(--stage-faint); font-size: 11px; font-weight: 700; display: grid; place-items: center; margin-top: 1px; }

/* ── Avisos ───────────────────────────────────────────────────── */
.al-aviso { margin-top: 10px; padding: 8px 11px; border-radius: 9px; font-size: 12.5px; line-height: 1.5; color: var(--stage-text); border: 1px solid var(--stage-line); }
.al-aviso.ok { background: color-mix(in srgb, var(--serie-1) 10%, transparent); border-color: color-mix(in srgb, var(--serie-1) 45%, transparent); }
.al-aviso.err { background: color-mix(in srgb, var(--serie-3) 11%, transparent); border-color: color-mix(in srgb, var(--serie-3) 50%, transparent); }
.al-aviso.warn { background: color-mix(in srgb, var(--serie-2) 10%, transparent); border-color: color-mix(in srgb, var(--serie-2) 45%, transparent); }

/* ── Tablas de la escena ──────────────────────────────────────── */
.al-tabla-wrap { overflow-x: auto; }
.al-tabla { width: 100%; border-collapse: collapse; font-size: 12.5px; font-variant-numeric: tabular-nums; color: var(--stage-text); }
.al-tabla th, .al-tabla td { padding: 5px 8px; border-bottom: 1px solid var(--stage-line); text-align: center; white-space: nowrap; }
.al-tabla thead th { font-size: 11.5px; font-weight: 700; color: var(--stage-text); border-bottom-color: rgba(239,232,216,.28); }
.al-tabla td:first-child, .al-tabla th:first-child { text-align: left; }
.al-tabla td.izq { text-align: left; }
.al-tabla tbody td:first-child { font-weight: 600; }
.al-tabla tbody tr:last-child > * { border-bottom: 0; }
.al-tabla tr.actual > * { background: color-mix(in srgb, var(--serie-2) 16%, transparent); font-weight: 700; }

/* ── Plegables de la escena ───────────────────────────────────── */
details.al-plegable { margin-top: 10px; border-top: 1px solid var(--stage-line); padding-top: 9px; }
details.al-plegable > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 8px;
  font-size: 12.5px; font-weight: 700; color: var(--stage-text); border-radius: 6px;
}
details.al-plegable > summary small { font-weight: 500; color: var(--stage-faint); }
details.al-plegable > summary::-webkit-details-marker { display: none; }
details.al-plegable > summary::after {
  content: ""; flex: 0 0 auto; width: 7px; height: 7px; margin-right: 4px;
  border-right: 2px solid var(--stage-faint); border-bottom: 2px solid var(--stage-faint);
  transform: rotate(45deg); transition: transform .15s;
}
details.al-plegable[open] > summary::after { transform: rotate(-135deg); }
details.al-plegable > summary:hover::after { border-color: var(--stage-text); }
details.al-plegable > summary:focus-visible { outline: 2px solid var(--stage-text); outline-offset: 3px; }
.al-plegable-cuerpo { margin-top: 10px; display: flex; flex-direction: column; gap: 10px; }

/* Selector pequeño dentro de la escena (método de desarrollo) */
.al-elige { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; font-size: 12px; color: var(--stage-faint); }
.al-elige .caja { position: relative; display: inline-block; max-width: 100%; }
.al-elige .caja::after {
  content: ""; position: absolute; right: 10px; top: 50%; width: 6px; height: 6px; margin-top: -5px; pointer-events: none;
  border-right: 2px solid var(--stage-faint); border-bottom: 2px solid var(--stage-faint); transform: rotate(45deg);
}
.al-elige select {
  appearance: none; -webkit-appearance: none; cursor: pointer; color-scheme: dark;
  font: 600 12.5px var(--font); color: var(--stage-text); background: var(--stage-2);
  border: 1px solid var(--stage-line); border-radius: 7px; padding: 5px 26px 5px 9px; max-width: 100%;
}
.al-elige select:focus-visible { outline: 2px solid var(--stage-text); outline-offset: 2px; }

/* ── Desarrollo del determinante ──────────────────────────────── */
.al-des { display: flex; flex-direction: column; gap: 6px; font-size: 13px; line-height: 1.55; color: var(--stage-text); font-variant-numeric: tabular-nums; }
.al-des-grupo { margin-top: 2px; font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--stage-faint); }
.al-des-fila { display: grid; grid-template-columns: 18px minmax(0, 1fr); gap: 6px; align-items: baseline; overflow-wrap: anywhere; }
.al-des-fila .sg { font-weight: 800; color: var(--serie-2); text-align: center; }
.al-des-fila .cero { color: var(--stage-faint); }
.al-des-adj { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 8px; }
.al-des-total { margin-top: 4px; padding: 8px 11px; border-radius: 9px; background: color-mix(in srgb, var(--serie-1) 9%, transparent); border: 1px solid color-mix(in srgb, var(--serie-1) 35%, transparent); font-weight: 600; overflow-wrap: anywhere; }
.al-des-total b { color: var(--serie-1); }
.al-res { color: var(--serie-1); font-weight: 700; }

/* ── Gauss ────────────────────────────────────────────────────── */
.al-gauss { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 6px; overflow-x: auto; padding-bottom: 2px; }
.al-gauss-paso { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; max-width: 100%; }
.al-gauss-op { display: inline-flex; flex-direction: column; align-items: center; min-width: 46px; }
.al-gauss-op .ops { display: flex; flex-direction: column; align-items: center; gap: 1px; font-size: 11.5px; font-weight: 600; color: var(--serie-2); white-space: nowrap; line-height: 1.3; }
.al-gauss-op .flecha { width: 100%; min-width: 40px; height: 10px; position: relative; }
.al-gauss-op .flecha::before { content: ""; position: absolute; left: 0; right: 4px; top: 4px; border-top: 1.6px solid var(--stage-faint); }
.al-gauss-op .flecha::after { content: ""; position: absolute; right: 1px; top: 1px; width: 6px; height: 6px; border-top: 1.6px solid var(--stage-faint); border-right: 1.6px solid var(--stage-faint); transform: rotate(45deg); }
.al-sust { display: flex; flex-direction: column; gap: 5px; font-size: 13px; line-height: 1.5; color: var(--stage-text); font-variant-numeric: tabular-nums; }
.al-sust .de { color: var(--stage-faint); font-weight: 600; margin-right: 6px; }
.al-sust .fin { color: var(--serie-1); font-weight: 700; }
.al-sust .mal { color: var(--serie-3); font-weight: 700; }

/* ── Pastillas de clasificación ───────────────────────────────── */
.pill { display: inline-block; border-radius: 99px; padding: 1px 8px; font-size: 11.5px; font-weight: 700; border: 1px solid transparent; }
.pill-scd { color: var(--serie-1); background: color-mix(in srgb, var(--serie-1) 14%, transparent); border-color: color-mix(in srgb, var(--serie-1) 40%, transparent); }
.pill-sci { color: var(--serie-4); background: color-mix(in srgb, var(--serie-4) 14%, transparent); border-color: color-mix(in srgb, var(--serie-4) 40%, transparent); }
.pill-si  { color: var(--serie-3); background: color-mix(in srgb, var(--serie-3) 14%, transparent); border-color: color-mix(in srgb, var(--serie-3) 40%, transparent); }

/* ── Pestañas de la escena ────────────────────────────────────── */
.al-pestanas { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; border-radius: 11px; background: color-mix(in srgb, var(--stage-text) 5%, transparent); border: 1px solid var(--stage-line); }
.al-pestanas button {
  flex: 1 1 auto; appearance: none; cursor: pointer; border: 1px solid transparent; border-radius: 8px;
  padding: 7px 10px; font: 600 12.5px var(--font); color: var(--stage-faint); background: transparent;
  transition: background .15s, color .15s;
}
.al-pestanas button:hover { color: var(--stage-text); background: color-mix(in srgb, var(--stage-text) 6%, transparent); }
.al-pestanas button[aria-selected="true"] { color: var(--stage-text); background: color-mix(in srgb, var(--serie-1) 18%, transparent); border-color: color-mix(in srgb, var(--serie-1) 45%, transparent); }
.al-pestanas button:focus-visible { outline: 2px solid var(--stage-text); outline-offset: 2px; }

/* ── Columna: rejilla de entradas y parámetro ─────────────────── */
.al-rejilla { display: grid; gap: 5px; align-items: center; }
.al-rejilla .cab { font-size: 11px; font-weight: 700; color: var(--text-faint); text-align: center; }
.al-rejilla .sep { text-align: center; color: var(--text-faint); font-size: 15px; }
.al-celda {
  width: 100%; min-width: 0; text-align: center;
  font: 600 13px var(--font); font-variant-numeric: tabular-nums; color: var(--text);
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 7px; padding: 6px 4px;
}
.al-celda:hover { border-color: var(--border-strong); }
.al-celda:focus-visible { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 25%, transparent); }
.al-celda.err { border-color: var(--err); }
.al-rotulo-rej { font-size: 11px; font-weight: 700; color: var(--text-faint); margin-bottom: -2px; }
.al-param-valor input { width: 92px; }
.al-criticos { font-size: 12px; line-height: 1.45; color: var(--text-muted); }

@media (max-width: 620px) {
  .al-grande { font-size: 16.5px; }
  .mat .cuerpo > span { font-size: 13px; }
  .al-gauss { gap: 8px 4px; }
}