:root {
  --paper: #fbf9f2;
  --grid: #e8e4d6;
  --card: #fffdf7;
  --band: #f2efe5;
  --track: #e9e5d8;
  --ink: #22221f;
  --ink-soft: #4d4b44;
  --ink-mute: #6f6c5e;
  --green: #1a6b52;
  --green-dark: #14553f;
  --green-soft: #e4f1ea;
  --clay: #a33f28;
  --marker: #ffe27a;
  --mint: #cfe9dc;
  --dark: #22221f;
  --dark-ink: #f6f4ec;
  --dark-soft: #b8b4a7;
  --shadow: 0 2px 4px rgba(34, 34, 31, 0.05), 0 14px 34px rgba(34, 34, 31, 0.08);
  --gutter: 64px;
}

@media (max-width: 860px) {
  :root { --gutter: 24px; }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Work Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  caret-color: var(--green);
}

::selection { background: var(--marker); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 3px;
}

* { scrollbar-color: #c9c5b6 var(--band); scrollbar-width: thin; }

a { color: var(--green); text-underline-offset: 3px; }
a:hover { color: var(--green-dark); }

img { max-width: 100%; }

h1, h2, h3 { margin: 0; line-height: 1.15; letter-spacing: -0.025em; }
h1 { font-size: clamp(38px, 5.4vw, 66px); line-height: 1.02; letter-spacing: -0.035em; font-weight: 700; }
h2 { font-size: clamp(27px, 3.2vw, 34px); font-weight: 700; }
h3 { font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }

p { margin: 0; }

.limite { max-width: 1200px; margin: 0 auto; }
.pad { padding-left: var(--gutter); padding-right: var(--gutter); }

.prosa { font-size: 18px; line-height: 1.65; color: var(--ink-soft); max-width: 68ch; }
.densa { font-size: 17px; line-height: 1.6; color: var(--ink-soft); max-width: 68ch; }
.meta { font-size: 16px; color: var(--ink-mute); }

.nota {
  font-family: "Patrick Hand", "Work Sans", sans-serif;
  color: #5a5238;
  font-size: 21px;
  line-height: 1.35;
  margin: 0;
}

/* cabecera */
.cabecera {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 249, 242, 0.88);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  transition: box-shadow 200ms ease, background 200ms ease;
}
.cabecera.elevada {
  background: rgba(251, 249, 242, 0.96);
  box-shadow: 0 1px 0 var(--track), 0 10px 24px rgba(34, 34, 31, 0.05);
}
@supports not (backdrop-filter: blur(10px)) {
  .cabecera { background: var(--paper); }
}
@media (prefers-reduced-motion: reduce) {
  .cabecera { transition: none; }
}

.barra {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding-block: 16px;
  flex-wrap: wrap;
}
.marca-sitio {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}
.marca-sitio svg { flex-shrink: 0; }
.menu { display: flex; gap: 22px; align-items: center; font-size: 16px; flex-wrap: wrap; }
.menu a { color: var(--ink-soft); text-decoration: none; }
.menu a:hover, .menu a[aria-current="page"] { color: var(--ink); }

/* acciones */
.cta {
  display: inline-block;
  background: var(--green);
  color: var(--paper);
  padding: 15px 26px;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.cta:hover { background: var(--green-dark); color: var(--paper); }
.cta.secundaria { background: var(--band); color: var(--ink); box-shadow: var(--shadow); }
.cta.secundaria:hover { background: var(--track); color: var(--ink); }

/* piezas */
.tarjeta {
  background: var(--card);
  border-radius: 14px;
  padding: 32px 36px;
  box-shadow: var(--shadow);
}
@media (max-width: 560px) { .tarjeta { padding: 24px 22px; } }

.rejilla { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 32px; }
@media (max-width: 860px) { .rejilla { grid-template-columns: 1fr; gap: 28px; } }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
@media (max-width: 860px) {
  .col-4, .col-5, .col-7, .col-8 { grid-column: 1 / -1; }
}

.seccion { padding-top: 80px; }
.banda { margin-top: 80px; background: var(--band); padding-top: 56px; padding-bottom: 56px; }
.banda-oscura {
  margin-top: 80px;
  background: var(--dark);
  color: var(--dark-ink);
  padding-top: 56px;
  padding-bottom: 56px;
}
.banda-oscura .prosa { color: var(--dark-soft); }

.marca {
  background-image: linear-gradient(transparent 58%, var(--marker) 58%);
  background-repeat: no-repeat;
  background-size: 0% 100%;
  animation: pintar 900ms cubic-bezier(0.16, 1, 0.3, 1) 300ms forwards;
}
@keyframes pintar { to { background-size: 100% 100%; } }
@media (prefers-reduced-motion: reduce) {
  .marca { animation: none; background-size: 100% 100%; }
}

.pista {
  font-weight: 600;
  background-image: linear-gradient(transparent 58%, var(--mint) 58%);
  padding: 0 3px;
}

/* opciones de pregunta */
.opciones { display: flex; flex-direction: column; gap: 10px; margin: 22px 0 0; padding: 0; list-style: none; }
.opcion {
  width: 100%;
  text-align: left;
  font: inherit;
  background: var(--band);
  border: 0;
  border-radius: 8px;
  padding: 14px 18px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  cursor: pointer;
  min-height: 48px;
}
.opcion:hover:not(:disabled) { background: var(--track); }
.opcion .letra { color: var(--ink-mute); font-weight: 600; }
.opcion[aria-pressed="true"] { background: var(--green-soft); font-weight: 600; }
.opcion[aria-pressed="true"] .letra { color: var(--green); }
.opcion.correcta { background: var(--green-soft); font-weight: 600; }
.opcion.correcta .letra { color: var(--green); }
.opcion.incorrecta { background: #f7e2dc; }
.opcion.incorrecta .letra { color: var(--clay); }
.opcion:disabled { cursor: default; }

/* avance */
.barra-avance { height: 8px; background: var(--track); border-radius: 999px; margin-top: 8px; overflow: hidden; }
.barra-avance i { display: block; height: 100%; border-radius: 999px; background: var(--green); }
.barra-avance i.baja { background: var(--clay); }

.lista-limpia { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 16px; }

.pie { padding-top: 60px; padding-bottom: 72px; display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; flex-wrap: wrap; }
.sello { font-size: 16px; color: var(--ink-mute); margin-top: 14px; }

/* transiciones entre páginas */
@view-transition { navigation: auto; }

::view-transition-old(root) { animation: salir 180ms cubic-bezier(0.4, 0, 1, 1) both; }
::view-transition-new(root) { animation: entrar 320ms cubic-bezier(0.16, 1, 0.3, 1) both; }

@keyframes salir { to { opacity: 0; transform: translateY(-6px); } }
@keyframes entrar { from { opacity: 0; transform: translateY(10px); } }

/* aparición de secciones */
.js [data-revelar] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 520ms cubic-bezier(0.16, 1, 0.3, 1), transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}
.js [data-revelar].visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
  .js [data-revelar] { opacity: 1; transform: none; transition: none; }
}

/* diferencias clave */
.encabezado-diferencias { max-width: 72ch; }
.controles { display: flex; align-items: center; gap: 18px; margin-top: 28px; flex-wrap: wrap; }

.marco-diferencias {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  margin-top: 56px;
}
@media (max-width: 1000px) { .marco-diferencias { grid-template-columns: 1fr; gap: 32px; } }

.indice-lateral { position: sticky; top: 96px; max-height: calc(100vh - 120px); overflow-y: auto; }
@media (max-width: 1000px) { .indice-lateral { position: static; max-height: none; overflow: visible; } }
.indice-caja { }
.indice-caja > summary { display: none; }
.indice-caja ul { list-style: none; margin: 0; padding: 0; }
.indice-dominio + .indice-dominio { margin-top: 22px; }
.indice-dominio-titulo {
  display: block;
  font-weight: 600;
  font-size: 16px;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--track);
  margin-bottom: 10px;
}
.indice-dominio ul { display: flex; flex-direction: column; gap: 8px; }
.indice-rango { color: var(--ink-mute); font-variant-numeric: tabular-nums; font-weight: 400; }
.indice-dominio ul a {
  display: flex;
  gap: 8px;
  padding: 2px 0;
  font-size: 15px;
  line-height: 1.4;
  color: var(--ink-soft);
  text-decoration: none;
}
.indice-dominio ul a:hover { color: var(--green); }
.indice-dominio ul a.actual { color: var(--ink); font-weight: 600; }
.js .indice-dominio:not(.abierto) ul { display: none; }
.indice-num { color: var(--ink-mute); font-variant-numeric: tabular-nums; }

.columna-diferencias { max-width: 68ch; }
.dominio { padding-top: 8px; }
.dominio + .dominio { padding-top: 64px; }
.dominio h2 { margin-bottom: 8px; }
.conteo {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-mute);
  vertical-align: middle;
  margin-left: 8px;
  font-variant-numeric: tabular-nums;
}
.lista-diferencias { display: flex; flex-direction: column; gap: 40px; margin-top: 28px; }

.diferencia { scroll-margin-top: 92px; }
.dif-cabeza { display: flex; gap: 16px; align-items: baseline; }
.dif-titular { flex: 1 1 auto; }
.numero {
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-mute);
  padding-top: 2px;
}
.diferencia h3 { font-size: 22px; line-height: 1.3; }
.diferencia h3 a { color: inherit; text-decoration: none; }
.diferencia h3 a:hover { color: var(--green); }
.dif-titular p { margin-top: 10px; }
.dif-titular .pista { font-weight: 400; }
.dif-cuerpo { margin: 18px 0 0 46px; display: flex; flex-direction: column; gap: 14px; }
@media (max-width: 560px) { .dif-cuerpo { margin-left: 0; } }
.confusion { font-size: 17px; line-height: 1.6; color: var(--ink-soft); }
.rotulo { font-weight: 600; color: var(--ink-soft); }
.regla { font-size: 17px; line-height: 1.6; color: var(--ink-soft); }
.tema-pie { font-size: 14px; color: var(--ink-mute); }

.mapa { border-collapse: collapse; width: 100%; font-size: 16px; }
.mapa th, .mapa td { text-align: left; padding: 10px 14px; vertical-align: top; }
.mapa th { font-weight: 400; color: var(--ink-soft); width: 55%; }
.mapa td { font-weight: 600; }
.mapa tr { background: var(--card); }
.mapa tr:nth-child(even) { background: var(--band); }
.mapa tr + tr { border-top: 1px solid var(--track); }
@media (max-width: 560px) { .mapa th { width: 48%; } }

.dominada { display: flex; flex: 0 0 auto; min-height: 24px; align-items: center; gap: 7px; font-size: 14px; color: var(--ink-mute); cursor: pointer; white-space: nowrap; }
.dominada input { accent-color: var(--green); width: 16px; height: 16px; cursor: pointer; }
.diferencia.dominada-si .dif-titular h3 a { color: var(--ink-mute); }

/* vista de solo pistas */
.solo-pistas .dif-cuerpo { display: none; }
.solo-pistas .lista-diferencias { gap: 12px; margin-top: 20px; }
.solo-pistas .diferencia h3 { font-size: 17px; }
.solo-pistas .dif-titular p { margin-top: 4px; }
.solo-pistas .dominio + .dominio { padding-top: 40px; }
.solo-pistas .diferencia.dominada-si h3 { color: var(--ink-mute); font-weight: 400; }
.solo-pistas .diferencia.dominada-si .pista { display: none; }

/* impresión: la hoja de la mañana del examen */
@media print {
  body { background: #fff; font-size: 12pt; }
  .barra, .controles, .indice-lateral, .nota, .dominada, .pie .sello { display: none; }
  .marco-diferencias { display: block; }
  .columna-diferencias { max-width: 78ch; }
  .js [data-revelar] { opacity: 1; transform: none; transition: none; }
  .diferencia { break-inside: avoid; page-break-inside: avoid; }
  .dominio { break-before: page; }
  .dominio:first-child { break-before: auto; }
  .solo-pistas .dominio { break-before: auto; }
  .pista { background: none; text-decoration: underline; }
  a { color: inherit; text-decoration: none; }
}

/* índice plegable en pantallas chicas */
@media (max-width: 1000px) {
  .indice-caja > summary {
    display: block;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--track);
    list-style: none;
  }
  .indice-caja > summary::-webkit-details-marker { display: none; }
  .indice-caja > summary::after { content: " ▾"; color: var(--ink-mute); }
  .indice-caja[open] > summary::after { content: " ▴"; }
  .indice-caja > ul { padding-top: 16px; }
  .js .indice-dominio:not(.abierto) ul { display: flex; }
}

/* el header es la misma barra entre páginas, no parpadea */
header { view-transition-name: cabecera; }
::view-transition-group(cabecera),
::view-transition-old(cabecera),
::view-transition-new(cabecera) { animation: none; }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.subtitulo { font-size: 21px; line-height: 1.4; color: var(--ink-soft); margin-top: 14px; font-weight: 600; letter-spacing: -0.01em; }

.etiqueta-ejemplo {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
  background: var(--band);
  padding: 3px 8px;
  border-radius: 999px;
  vertical-align: middle;
  margin-left: 8px;
}
.cierre { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; align-items: start; }
@media (max-width: 860px) { .cierre { grid-template-columns: 1fr; gap: 24px; } }
.cierre-accion { padding-top: 6px; }

code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.92em;
  background: var(--band);
  padding: 2px 6px;
  border-radius: 5px;
}

/* práctica */
.modos-practica { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.accion {
  text-align: left;
  font: inherit;
  color: inherit;
  border: 0;
  background: var(--card);
  border-radius: 14px;
  padding: 24px 26px;
  cursor: pointer;
  display: grid;
  gap: 8px;
  box-shadow: var(--shadow);
}
.accion:hover { background: #fffefb; }
.accion b { font-size: 20px; font-weight: 600; letter-spacing: -0.015em; }
.accion span { color: var(--ink-soft); font-size: 16px; line-height: 1.55; }

.por-tema { margin-top: 44px; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.chip {
  font: inherit;
  color: inherit;
  border: 0;
  background: var(--band);
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  display: flex;
  gap: 8px;
  align-items: baseline;
  min-height: 44px;
}
.chip:hover { background: var(--track); }

.cabeza-pregunta { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.acciones-pregunta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; align-items: center; }
.retro { margin-top: 24px; border-radius: 12px; padding: 20px 22px; display: grid; gap: 12px; }
.retro.bien { background: var(--green-soft); }
.retro.mal { background: #f7e2dc; }
.retro h3 { font-size: 19px; }
.retro.bien h3 { color: var(--green); }
.retro.mal h3 { color: var(--clay); }

.resultado {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  margin: 10px 0 14px;
  font-variant-numeric: tabular-nums;
}
.repaso-lista { margin-top: 28px; display: grid; gap: 18px; }
.repaso-lista h3 { font-size: 19px; }
.repaso-item { background: var(--band); border-radius: 12px; padding: 18px 20px; display: grid; gap: 10px; }

/* accesibilidad */
.saltar {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 18px;
  border-radius: 0 0 8px 0;
  z-index: 10;
  text-decoration: none;
}
.saltar:focus { left: 0; color: var(--paper); }

.banda-oscura :focus-visible { outline-color: #8fd3b6; }

#alternar-pistas[aria-pressed="true"] { background: var(--green-soft); }

/* a 320 px la etiqueta de dominada bajaba a su propia línea */
@media (max-width: 560px) {
  .dif-cabeza { flex-wrap: wrap; }
  .dominada { order: 3; flex-basis: 100%; margin-left: 31px; }
}
@media (max-width: 1000px) {
  .marco-diferencias { grid-template-columns: minmax(0, 1fr); }
}

/* llamada a la acción principal */
.cta.grande { font-size: 19px; padding: 18px 34px; border-radius: 10px; }
.menu a.nav-cta,
.menu a.nav-cta:hover,
.menu a.nav-cta[aria-current="page"] {
  background: var(--green);
  color: var(--paper);
  padding: 9px 16px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  line-height: 1.2;
}
.menu a.nav-cta:hover { background: var(--green-dark); }

.dominio { scroll-margin-top: 92px; }
section[id] { scroll-margin-top: 92px; }
@media print { .cabecera { position: static; box-shadow: none; background: none; } }