/* math.pinwinos.com: aspecto de documentación técnica. Monoespaciada, sin bordes
   redondeados ni sombras, reglas de 1px; el color solo marca estado (bien, mal, ojo). */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #111111;
  --dim: #666666;
  --line: #d4d4d4;
  --tint: #f4f4f4;
  --link: #0645ad;
  --good: #11713a;
  --bad: #b3261e;
  --warn: #8a5a00;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0d0d0d; --fg: #e6e6e6; --dim: #8c8c8c; --line: #333333; --tint: #1a1a1a;
    --link: #8ab4f8; --good: #5dc98a; --bad: #f28b82; --warn: #e3b341;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 var(--mono);
  -webkit-text-size-adjust: 100%;
  padding:
    max(8px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    max(32px, env(safe-area-inset-bottom))
    max(16px, env(safe-area-inset-left));
}
.page { max-width: 46rem; margin-inline: auto; display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; }
main { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
p, dl, dd { margin: 0; }
a { color: var(--link); }
h1, h2, h3, h4 { margin: 0; line-height: 1.3; font-weight: 700; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.1rem; border-bottom: 1px solid var(--fg); padding-bottom: 2px; margin-top: 12px; }
h3 { font-size: 1rem; margin-top: 8px; }
h4 { font-size: .95rem; color: var(--dim); font-weight: 600; }
code { font: inherit; background: var(--tint); padding: 0 .2em; }
pre { margin: 0; padding: 8px 10px; background: var(--tint); border: 1px solid var(--line); overflow-x: auto; font: .85rem/1.5 var(--mono); }
.dim { color: var(--dim); }
.bien { color: var(--good); }
.mal { color: var(--bad); }
.ojo { color: var(--warn); }
.nw { white-space: nowrap; }

/* cabecera: nombre, idioma y secciones */
header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 8px 0 8px;
  border-bottom: 1px solid var(--fg);
}
.home { font-weight: 700; color: var(--fg); text-decoration: none; }
.idiomas { color: var(--dim); }
.idiomas a { color: var(--dim); }
header nav { grid-column: 1 / -1; color: var(--dim); }
header nav b { color: var(--fg); }
footer { color: var(--dim); font-size: .85rem; border-top: 1px solid var(--line); padding-top: 10px; }

/* controles: rectangulares, contorno de 1px */
button, input, textarea { font: inherit; color: inherit; border-radius: 0; }
button {
  cursor: pointer;
  background: var(--bg);
  border: 1px solid var(--fg);
  padding: 2px 8px;
  min-height: 36px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
button:active { background: var(--tint); }
button:disabled { opacity: .35; cursor: default; }
input, textarea { background: var(--bg); border: 1px solid var(--fg); padding: 6px 8px; }
button:focus-visible, input:focus-visible, textarea:focus-visible, a:focus-visible, summary:focus-visible {
  outline: 2px solid var(--link); outline-offset: 1px;
}

/* tablas y definiciones de la referencia */
.ref { display: grid; gap: 10px; }
.scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; vertical-align: top; padding: 4px 10px 4px 0; border-bottom: 1px solid var(--line); }
th { font-weight: 600; color: var(--dim); border-bottom-color: var(--fg); }
.patrones td:nth-child(1), .patrones td:nth-child(3), .patrones td:nth-child(4) { white-space: nowrap; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; }
dt { font-weight: 700; }
@media (max-width: 30rem) {
  dl { grid-template-columns: 1fr; gap: 0; }
  dd { padding-left: 2ch; margin-bottom: 6px; }
}

/* --- entrenador (/calculo/, /sistema-mayor/) --- */
.app { border: 1px solid var(--fg); padding: 12px; min-width: 0; }
.app > div > div { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.aviso:empty { display: none; }

.lista { list-style: none; margin: 0; padding: 0; }
.fila { display: flex; align-items: center; gap: 8px; border-top: 1px solid var(--line); }
.fila:last-child { border-bottom: 1px solid var(--line); }
.correr {
  flex: 1; min-width: 0;
  display: grid; grid-template-columns: 3ch 1fr; column-gap: 8px;
  text-align: left; border: 0; padding: 6px 0; background: none;
}
.correr .n { color: var(--dim); text-align: right; }
.correr .nombre { font-weight: 700; overflow-wrap: anywhere; }
.correr .stats { grid-column: 2; font-size: .85rem; }
.acc { display: flex; gap: 4px; }
.acc button { min-width: 44px; }
.chips { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.atajos button, .acciones button { min-height: 32px; min-width: 32px; padding: 0 6px; }

.prompt { display: flex; gap: 6px; align-items: stretch; }
.prompt > span { align-self: center; font-weight: 700; }
.prompt input { flex: 1; min-width: 0; font-size: 1.05rem; }
.prompt button { min-width: 44px; }

.cab { font-size: .8rem; display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px solid var(--line); padding-bottom: 4px; }
.reloj { font-weight: 700; font-variant-numeric: tabular-nums; }
.num { font-size: .85rem; margin-bottom: -8px; }
.pregunta { font-size: clamp(1.6rem, 8vw, 2.3rem); font-weight: 700; line-height: 1.2; overflow-wrap: anywhere; min-height: 1.2em; }
.feedback { min-height: 1.55em; }
.ultimas { list-style: none; margin: 0; padding: 0; font-size: .85rem; color: var(--dim); }
.ultimas li.mal { color: var(--bad); }

#corrida .teclado { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; }
#corrida .teclado button { min-height: 52px; font-size: 1.3rem; }
#corrida .teclado [data-k="abc"], #corrida .teclado [data-k="r"] { font-size: 1rem; }
#corrida .teclado .ok { grid-column: span 2; background: var(--fg); color: var(--bg); }
#tecla-r[hidden] + [data-k="del"] { grid-column: span 2; }

.memo-box { display: grid; gap: 12px; }
#rep-cuerpo { display: grid; gap: 8px; }
#rep-cuerpo h2 { margin-top: 0; }
.record { font-weight: 700; }
.fallas, .corridas { margin: 0; padding-left: 2ch; }
.corridas { list-style: none; padding: 0; }
.corridas .fallas { font-size: .85rem; }

.tabla-major { display: grid; grid-template-columns: repeat(auto-fill, minmax(8.5em, 1fr)); column-gap: 12px; font-size: .85rem; }
.celda { display: flex; gap: 1ch; min-width: 0; border-bottom: 1px solid var(--line); white-space: nowrap; }
.celda b { width: 2ch; text-align: right; color: var(--dim); font-weight: 400; flex: none; }
.celda small { font-size: inherit; overflow: hidden; text-overflow: ellipsis; }
.celda.hueco small { color: var(--dim); }
textarea { width: 100%; font-size: .9rem; line-height: 1.5; }
.secuencia { display: grid; gap: 6px; }

/* pares de dígitos: memoria del entrenador y práctica de π */
.pares { display: flex; flex-wrap: wrap; gap: 4px; }
.par { display: grid; justify-items: center; min-width: 3.2em; padding: 2px 6px; border: 1px solid var(--line); }
.par b { font-size: 1.3rem; }
.par small { font-size: .75rem; color: var(--dim); }
.memo-box .par b { font-size: 1.8rem; }

/* --- π (/pi/) --- */
.pi { border: 1px solid var(--fg); padding: 12px; display: grid; gap: 16px; min-width: 0; }
.pi .modos { display: flex; gap: 0; border-bottom: 1px solid var(--fg); }
.pi .modos button { border: 0; border-bottom: 3px solid transparent; margin-bottom: -1px; color: var(--dim); background: none; padding: 0 12px 4px 0; min-height: 32px; }
.pi .modos button[aria-selected="true"] { color: var(--fg); font-weight: 700; border-bottom-color: var(--fg); }
.pi .vista { display: grid; gap: 14px; }
.pi .rastro { font-size: 1.8rem; line-height: 1.3; word-break: break-all; max-height: 5.2em; overflow-y: auto; min-height: 1.3em; }
.pi .rastro .previo { color: var(--dim); }
.pi .rastro s { color: var(--bad); text-decoration-thickness: 3px; }
#estado { font-size: .85rem; color: var(--dim); font-variant-numeric: tabular-nums; margin-top: -10px; min-height: 1.5em; }
.pi .meta { display: flex; align-items: baseline; gap: 8px; }
.pi .meta input {
  width: 5ch; text-align: center; font-weight: 700;
  -moz-appearance: textfield; appearance: textfield;
}
.pi .meta input::-webkit-inner-spin-button, .pi .meta input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.pi .bloque { display: grid; gap: 10px; justify-items: start; }
.pi button.principal { background: var(--fg); color: var(--bg); min-height: 44px; padding: 0 16px; }
.pi .teclado { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; }
.pi .teclado button { min-height: 52px; font-size: 1.3rem; }

.pi .tramo {
  --cols: 3;
  --ancho: min(100vw - 58px, 46rem - 26px);
  --wn: min(6rem, calc((var(--ancho) - (var(--cols) - 1) * 4px) / var(--cols)));
  display: grid; gap: 12px;
}
#tramo-pos { font-size: .85rem; font-variant-numeric: tabular-nums; }
.pi .pares { --w: var(--wn); display: grid; grid-template-columns: repeat(var(--cols), var(--w)); gap: 4px; }
.pi .pares .par { display: block; min-width: 0; text-align: center; padding: .25em 0; font-size: calc(var(--w) / 2.2); font-weight: 700; line-height: 1.1; }
.pi .pares:not(.antes) { cursor: pointer; user-select: none; -webkit-user-select: none; }
.pi .pares.antes { --w: calc(var(--wn) * .6); }
.pi .pares.antes .par { color: var(--dim); border-style: dashed; }
.pi .flechas { display: grid; grid-template-columns: 1fr 2fr; gap: 4px; }
.pi .flechas button { min-height: 48px; }
.pi .tabla details summary { color: var(--dim); cursor: pointer; }
.pi .tabla details pre { margin-top: 8px; border: 0; padding: 0; background: none; font-size: .9rem; line-height: 1.7; }
.pi .tabla .n { color: var(--dim); }