/* ------------------------------------------------------------------
   Mesa de cartas — Matemáticas
   Paleta y reglas de la casa (skill paleta-marca-gerardo):
     azul  #123b6b  = estructura (identidad, títulos)
     verde #0e7a4f  = acción (TODO lo que se debe clicar)
     oro   #8a6208  = valor (puntos, nivel, logros) con moderación
     fondo #fcfbf8  · superficie #ffffff · tinta #14243a · borde #dce3ea
   Dos fuentes: serif para títulos, sans para el resto.
   Contraste medido: ningún texto por debajo de 4.5:1.
   ------------------------------------------------------------------ */

:root {
  /* base de la casa */
  --bg: #fcfbf8;
  --bg-alt: #f6f7f9;
  --surface: #ffffff;
  --text: #14243a;
  --muted: #4a5a70;
  --border: #dce3ea;

  /* roles */
  --azul: #123b6b;
  --azul-medio: #1b5490;
  --azul-claro: #eaf1f8;
  --accent: #0e7a4f;
  --accent-h: #0a5f3d;
  --accent-claro: #e8f5ef;
  --gold: #8a6208;
  --gold-soft: #fdf6e6;

  --error: #a8201a;
  --error-claro: #fdeceb;

  /* tipografía: exactamente dos */
  --fuente-titulo: Georgia, "Times New Roman", "Playfair Display", serif;
  --fuente-cuerpo: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;

  /* escala */
  --e1: 4px; --e2: 8px; --e3: 12px; --e4: 16px; --e5: 24px; --e6: 32px; --e7: 48px;

  --radio: 14px;
  --radio-sm: 10px;
  --sombra-1: 0 1px 2px rgba(20, 36, 58, 0.06);
  --sombra-2: 0 2px 4px rgba(20, 36, 58, 0.06), 0 12px 32px rgba(20, 36, 58, 0.08);
  --sombra-3: 0 24px 70px rgba(20, 36, 58, 0.16);
}

*, *::before, *::after { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--fuente-cuerpo);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.pantalla {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--e5) var(--e4) var(--e7);
}

.ancho { width: 100%; max-width: 780px; }

/* ---------------------------------------------------------------- animaciones */

@keyframes entra {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes aparece { from { opacity: 0; } to { opacity: 1; } }

@keyframes linea {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes reparte {
  from { opacity: 0; transform: translateY(-16px) rotate(-1.5deg) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) rotate(0) scale(1); }
}

@keyframes gira {
  0%   { transform: rotateY(0deg); }
  48%  { transform: rotateY(90deg); }
  52%  { transform: rotateY(90deg); }
  100% { transform: rotateY(0deg); }
}

@keyframes sube {
  0%   { opacity: 0; transform: translateY(6px) scale(0.9); }
  25%  { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-40px) scale(1); }
}

.vista { animation: entra 340ms cubic-bezier(0.22, 1, 0.36, 1); }

/* ---------------------------------------------------------------- barra */

.barra-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--e3);
  padding: 0 var(--e1) var(--e5);
}

.barra-top .marca {
  font-family: var(--fuente-titulo);
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--azul);
}

.barra-top .marca em {
  font-style: normal;
  color: var(--muted);
  font-size: 13px;
  font-family: var(--fuente-cuerpo);
  margin-left: var(--e2);
}

.barra-top button, .barra-top a {
  background: none;
  border: 0;
  font: inherit;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 140ms, border-color 140ms;
}

.barra-top button:hover, .barra-top a:hover {
  color: var(--azul);
  border-bottom-color: var(--azul);
}

.puntos {
  font-weight: 700;
  font-size: 13px;
  color: var(--gold);
  background: var(--gold-soft);
  border: 1px solid #f0e2c0;
  border-radius: 99px;
  padding: var(--e1) var(--e3);
  font-variant-numeric: tabular-nums;
}

.racha {
  font-size: 12px;
  color: var(--accent);
  text-align: center;
  margin: calc(var(--e2) * -1) 0 var(--e4);
  font-weight: 650;
  letter-spacing: 0.01em;
}

.titulo {
  font-family: var(--fuente-titulo);
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0 0 var(--e1);
  color: var(--azul);
}

.sub {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 var(--e5);
}

/* ---------------------------------------------------------------- la mesa */

.mesa {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--e2);
  padding: var(--e4);
  margin-bottom: var(--e6);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 #fff, var(--sombra-1);
}

.naipe {
  position: relative;
  aspect-ratio: 3 / 4;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--e2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radio-sm);
  cursor: pointer;
  font: inherit;
  color: inherit;
  text-align: left;
  overflow: hidden;
  box-shadow: var(--sombra-1);
  animation: reparte 420ms cubic-bezier(0.22, 1, 0.36, 1) backwards;
  transition: transform 160ms cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 160ms ease, border-color 160ms ease;
}

.naipe::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--color, var(--azul));
}

.naipe:hover {
  transform: translateY(-4px);
  box-shadow: var(--sombra-2);
  border-color: #c8d4e0;
}

.naipe:focus-visible {
  outline: 3px solid var(--azul-medio);
  outline-offset: 2px;
}

.naipe.dominada {
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-claro) 100%);
  border-color: #bfe3d2;
}

.naipe .arriba {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.naipe .arriba .nivel {
  color: var(--gold);
  font-size: 10px;
  letter-spacing: 0;
  text-transform: none;
}

.naipe .nombre {
  font-family: var(--fuente-titulo);
  font-size: 12px;
  line-height: 1.22;
  letter-spacing: -0.005em;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.naipe .pie-naipe {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 9.5px;
  color: var(--muted);
}

.naipe .marca-ok { color: var(--accent); font-weight: 700; }

/* ---------------------------------------------------------------- escenario */

.escenario {
  display: flex;
  justify-content: center;
  perspective: 1600px;
}

.carta-grande {
  width: 100%;
  max-width: 560px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--sombra-3);
  padding: var(--e6) var(--e5) var(--e5);
  position: relative;
  transform-style: preserve-3d;
  animation: entra 340ms cubic-bezier(0.22, 1, 0.36, 1);
}

.carta-grande.girando { animation: gira 420ms cubic-bezier(0.4, 0, 0.2, 1); }

.carta-grande .cabecera-carta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--e3);
  margin-bottom: var(--e4);
}

.carta-grande .area {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--azul-medio);
}

.carta-grande .cerrar {
  background: none;
  border: 0;
  font-size: 22px;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  padding: var(--e1) var(--e2);
  border-radius: var(--e2);
  transition: background 140ms, color 140ms;
}

.carta-grande .cerrar:hover { color: var(--azul); background: var(--bg-alt); }

.carta-grande h1 {
  font-family: var(--fuente-titulo);
  font-size: 30px;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.18;
  margin: 0 0 var(--e5);
  color: var(--text);
}

.pasos-carta {
  counter-reset: paso;
  list-style: none;
  margin: 0 0 var(--e5);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--e3);
}

.pasos-carta li {
  counter-increment: paso;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: var(--e3);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  animation: linea 360ms cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

.pasos-carta li::before {
  content: counter(paso);
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 99px;
  background: var(--azul-claro);
  color: var(--azul);
  font-size: 11px;
  font-weight: 700;
  font-family: var(--fuente-cuerpo);
  margin-top: 1px;
}

.referencia {
  display: block;
  font-size: 12px;
  color: var(--muted);
  background: var(--bg-alt);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--e2) var(--e2) 0;
  padding: var(--e3) var(--e4);
  line-height: 1.55;
}

.referencia b { color: var(--text); font-weight: 650; }

/* ---------------------------------------------------------------- el ejercicio */

.enunciado {
  font-size: 27px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 var(--e4);
  color: var(--text);
}

.lienzo {
  width: 100%;
  margin: var(--e1) 0 var(--e4);
  background: var(--bg);
  border-radius: var(--radio-sm);
  padding: var(--e2);
}

.lienzo canvas { display: block; width: 100% !important; height: auto !important; }

.campo {
  width: 100%;
  padding: 15px var(--e4);
  font: inherit;
  font-size: 19px;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: var(--radio-sm);
  background: var(--bg);
  color: var(--text);
  margin-bottom: var(--e2);
  transition: border-color 140ms, box-shadow 140ms, background 140ms;
}

.campo::placeholder { color: #8c9aab; }

.campo:focus-visible {
  outline: none;
  border-color: var(--azul-medio);
  background: var(--surface);
  box-shadow: 0 0 0 4px rgba(27, 84, 144, 0.12);
}

.opciones { display: grid; gap: var(--e2); margin-bottom: var(--e3); }

.opcion {
  padding: var(--e3) var(--e4);
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radio-sm);
  cursor: pointer;
  color: var(--text);
  transition: border-color 140ms, background 140ms, transform 120ms;
}

.opcion:hover { border-color: var(--azul-medio); background: var(--azul-claro); }
.opcion:active { transform: scale(0.995); }

.opcion.elegida {
  border-color: var(--azul-medio);
  background: var(--azul-claro);
  box-shadow: 0 0 0 3px rgba(27, 84, 144, 0.14);
}

.opcion.bien { border-color: var(--accent); background: var(--accent-claro); color: var(--accent-h); }
.opcion.mal { border-color: #e7bdb9; background: var(--error-claro); color: var(--error); }

.ayuda-campo {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  margin: 0 0 var(--e3);
  line-height: 1.55;
}

.ayuda-campo b { color: var(--text); font-weight: 650; }

/* ---------------------------------------------------------------- resultado */

.respuesta {
  font-family: var(--fuente-titulo);
  font-size: 40px;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--accent-h);
  text-align: center;
  margin: var(--e2) 0 var(--e4);
  animation: aparece 260ms ease;
}

.pasos {
  background: var(--bg);
  border-radius: var(--radio-sm);
  padding: var(--e3) var(--e4);
  margin: 0 0 var(--e3);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.pasos .linea { display: block; opacity: 0; animation: linea 320ms ease forwards; }

.diag {
  font-size: 13.5px;
  line-height: 1.6;
  border-left: 3px solid var(--gold);
  background: var(--gold-soft);
  border-radius: 0 var(--e2) var(--e2) 0;
  padding: var(--e3) var(--e4);
  margin: 0 0 var(--e4);
  color: var(--text);
  animation: aparece 260ms ease;
}

.diag strong { color: var(--gold); }
.diag.ok { border-left-color: var(--accent); background: var(--accent-claro); }
.diag.ok strong { color: var(--accent-h); }

.veredicto {
  display: block;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: var(--e1);
  font-family: var(--fuente-cuerpo);
}

.veredicto.bien { color: var(--accent); }
.veredicto.mal { color: var(--error); }

.ganancia {
  position: absolute;
  right: var(--e5);
  top: 74px;
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
  animation: sube 1200ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
  pointer-events: none;
}

/* ---------------------------------------------------------------- botones */

.acciones { display: grid; grid-template-columns: 1fr 1fr; gap: var(--e2); width: 100%; }
.acciones.uno { grid-template-columns: 1fr; }

.boton {
  padding: 15px var(--e4);
  font: inherit;
  font-size: 15px;
  font-weight: 650;
  border-radius: var(--radio-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 140ms, border-color 140ms, transform 120ms, box-shadow 140ms;
}

.boton:hover { border-color: var(--azul-medio); }
.boton:active { transform: scale(0.995); }
.boton:focus-visible { outline: 3px solid var(--azul-medio); outline-offset: 2px; }

/* VERDE = lo que se debe clicar */
.boton.principal {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(14, 122, 79, 0.22);
}

.boton.principal:hover { background: var(--accent-h); border-color: var(--accent-h); }

.boton.bien { background: var(--accent); border-color: var(--accent); color: #fff; }
.boton.bien:hover { background: var(--accent-h); }

.boton.mal {
  background: var(--surface);
  color: var(--error);
  border-color: #e7bdb9;
}

.boton.mal:hover { background: var(--error-claro); border-color: #d9a5a0; }

.boton.plano { background: none; border-color: transparent; color: var(--muted); font-size: 13px; }
.boton.plano:hover { color: var(--azul); border-color: transparent; text-decoration: underline; }

/* ---------------------------------------------------------------- historial */

.fila-hist {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--e3);
  align-items: center;
  padding: var(--e3) var(--e4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radio-sm);
  margin-bottom: var(--e2);
  font-size: 14px;
  box-shadow: var(--sombra-1);
  animation: aparece 220ms ease;
}

.fila-hist .tema { font-weight: 650; color: var(--text); }
.fila-hist .cuando { font-size: 11.5px; color: var(--muted); }
.fila-hist .marca { font-size: 12.5px; font-weight: 700; }
.fila-hist .marca.ok { color: var(--accent); }
.fila-hist .marca.no { color: var(--error); }
.fila-hist .pts { font-size: 12.5px; color: var(--gold); font-weight: 700; font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- puerta */

body.con-puerta { overflow: hidden; }

.puerta {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--e5);
  background: linear-gradient(165deg, #0d2440 0%, #123b6b 100%);
}

.puerta-caja {
  width: 100%;
  max-width: 360px;
  background: var(--surface);
  border-radius: 18px;
  padding: var(--e6) var(--e5);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
  animation: entra 420ms cubic-bezier(0.22, 1, 0.36, 1);
}

.puerta-caja h1 {
  font-family: var(--fuente-titulo);
  font-size: 26px;
  font-weight: 400;
  margin: 0 0 var(--e1);
  color: var(--azul);
  text-align: center;
}

.puerta-caja .nota {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 var(--e5);
  text-align: center;
}

.puerta-caja label {
  display: block;
  font-size: 12px;
  font-weight: 650;
  margin-bottom: var(--e1);
  color: var(--text);
}

.puerta-caja input {
  width: 100%;
  padding: var(--e3) var(--e4);
  font: inherit;
  border: 1px solid var(--border);
  border-radius: var(--radio-sm);
  margin-bottom: var(--e4);
  background: var(--bg);
  color: var(--text);
}

.puerta-caja input:focus-visible {
  outline: none;
  border-color: var(--azul-medio);
  box-shadow: 0 0 0 4px rgba(27, 84, 144, 0.12);
}

.puerta-caja .boton { width: 100%; }
.puerta-error { margin: var(--e3) 0 0; font-size: 13px; color: var(--error); text-align: center; }

/* ---------------------------------------------------------------- utilidades */

.oculto { display: none !important; }

.piebar {
  margin-top: var(--e5);
  display: flex;
  gap: var(--e4);
  justify-content: center;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--muted);
}

.piebar button {
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
  padding: 0;
  border-bottom: 1px solid transparent;
}

.piebar button:hover { color: var(--azul); border-bottom-color: var(--azul); }

.frac {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  text-align: center;
  margin: 0 2px;
  line-height: 1.15;
}

.frac .num { border-bottom: 1.5px solid currentColor; padding: 0 4px; }
.frac .den { padding: 0 4px; }

/* ---------------------------------------------------------------- móvil */

@media (max-width: 560px) {
  .mesa { gap: 6px; padding: var(--e2); border-radius: 14px; }
  .naipe { padding: 6px 5px; border-radius: 8px; }
  .naipe .nombre { font-size: 10px; -webkit-line-clamp: 3; }
  .naipe .arriba, .naipe .pie-naipe { font-size: 8.5px; }
  .carta-grande { padding: var(--e5) var(--e4) var(--e4); border-radius: 14px; }
  .carta-grande h1 { font-size: 23px; }
  .enunciado { font-size: 22px; }
  .respuesta { font-size: 33px; }
  .acciones { grid-template-columns: 1fr; }
  .ganancia { right: var(--e4); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .barra-top, .piebar, .acciones, .zona-respuesta { display: none !important; }
  .carta-grande { box-shadow: none; border: 0; }
}

/* ==================================================================
   IMÁGENES, FONDO CON VIDA Y ESTADO DE LA CARTA
   Reglas de landing del cerebro: nada de fondo blanco plano; textura,
   profundidad, movimiento lento y una jerarquía clara.
   ================================================================== */

/* --- fondo: gradiente suave + textura de puntos + halo animado --- */
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(27, 84, 144, 0.07), transparent 45%),
    radial-gradient(circle at 88% 4%, rgba(138, 98, 8, 0.06), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(14, 122, 79, 0.05), transparent 50%),
    radial-gradient(rgba(18, 59, 107, 0.055) 1px, transparent 1px);
  background-size: auto, auto, auto, 22px 22px;
  background-attachment: fixed;
}

/* halo que respira detrás de la mesa */
.pantalla::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 70vh;
  background: radial-gradient(ellipse at 50% 0%, rgba(27, 84, 144, 0.10), transparent 65%);
  pointer-events: none;
  z-index: 0;
  animation: respira 14s ease-in-out infinite;
}

@keyframes respira {
  0%, 100% { opacity: 0.55; transform: scale(1); }
  50%      { opacity: 0.95; transform: scale(1.06); }
}

.pantalla > .ancho { position: relative; z-index: 1; }

/* --- naipe con ilustración --- */
.naipe {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.naipe-img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  position: relative;
  flex: none;
  border-bottom: 2px solid var(--color, var(--azul));
  background:
    radial-gradient(circle at 22% 18%, var(--color-suave, rgba(18,59,107,.10)) 0%, transparent 52%),
    linear-gradient(150deg, #ffffff 0%, var(--color-suave, rgba(18,59,107,.10)) 100%);
}

/* el glifo grande del area: respira y crece al pasar el cursor */
.naipe-gly {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-size: 46px;
  color: var(--color, var(--azul));
  opacity: 0.55;
  animation: flota 2.2s ease-in-out infinite;
  transition: transform 420ms cubic-bezier(0.22, 1, 0.36, 1), opacity 200ms ease;
  pointer-events: none;
}

.naipe:hover .naipe-gly { transform: scale(1.16) rotate(-5deg); opacity: 0.8; }

/* motas decorativas: tres puntos suaves que dan textura */
.naipe-motas {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle 5px at 16% 74%, var(--color-medio, rgba(18,59,107,.26)) 0%, transparent 100%),
    radial-gradient(circle 3px at 82% 24%, var(--color-medio, rgba(18,59,107,.26)) 0%, transparent 100%),
    radial-gradient(circle 4px at 72% 82%, var(--color-suave, rgba(18,59,107,.10)) 0%, transparent 100%);
  animation: flota 2.8s ease-in-out infinite reverse;
  pointer-events: none;
}

@keyframes flota {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

/* barrido de luz al pasar el cursor */
.naipe .brillo {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 38%, rgba(255,255,255,.55) 50%, transparent 62%);
  transform: translateX(-130%);
  pointer-events: none;
}

.naipe:hover .brillo { animation: barrido 460ms ease; }

@keyframes barrido {
  from { transform: translateX(-130%); }
  to { transform: translateX(130%); }
}

.naipe:hover { transform: translateY(-5px) rotate(-0.5deg); }

.naipe .arriba,
.naipe .nombre,
.naipe .pie-naipe {
  padding-left: 8px;
  padding-right: 8px;
}

.naipe .arriba { padding-top: 7px; }
.naipe .pie-naipe { padding-bottom: 7px; }

/* la franja del área pasa a ser un borde inferior de la imagen */
.naipe::before { display: none; }

/* --- estados de la carta --- */
/* usada (ya se intentó) → borde ámbar; dominada → verde y fondo suave */
.naipe.usada {
  border-color: #e2c98c;
  box-shadow: 0 0 0 1px #f0e2c0 inset, var(--sombra-1);
}

.naipe.usada .naipe-gly { opacity: 0.42; }

.naipe.dominada {
  border-color: #9fd3ba;
  box-shadow: 0 0 0 1px #bfe3d2 inset, var(--sombra-2);
  animation: reparte 420ms cubic-bezier(0.22, 1, 0.36, 1) backwards, auraDorada 1.3s ease-in-out infinite;
}

@keyframes auraDorada {
  0%, 100% { box-shadow: 0 0 0 1px #bfe3d2 inset, 0 0 0 0 rgba(138, 98, 8, 0.0); }
  50% { box-shadow: 0 0 0 1px #bfe3d2 inset, 0 0 14px 2px rgba(138, 98, 8, 0.18); }
}

.naipe.dominada::after {
  content: "✓";
  position: absolute;
  top: 5px;
  right: 5px;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border-radius: 99px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(14, 122, 79, 0.4);
  z-index: 2;
}

.naipe.usada:not(.dominada)::after {
  content: "";
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--gold);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.85);
  z-index: 2;
}

/* --- cabecera ilustrada de la carta grande --- */
.carta-grande { padding-top: 0; overflow: hidden; }

.carta-hero {
  margin: calc(var(--e6) * -1) calc(var(--e5) * -1) var(--e4);
  height: 190px;
  overflow: hidden;
  background: #fbfaf6;
  position: relative;
}

.carta-hero.chico { height: 96px; }

/* el lienzo de la escena p5 llena el héroe */
.carta-hero canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* héroe estático del reverso: degradado del área + glifo grande */
.carta-hero.estatica {
  background:
    radial-gradient(circle at 20% 25%, rgba(255,255,255,.75) 0%, transparent 55%),
    linear-gradient(150deg, var(--color-suave, rgba(18,59,107,.10)) 0%, #ffffff 100%);
}

.carta-hero.estatica .naipe-gly { font-size: 54px; animation: flota 2.2s ease-in-out infinite; }

.carta-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(252, 251, 248, 0) 45%, var(--surface) 100%);
}

.carta-grande h1 { position: relative; }

/* "Vas a": una sola línea que dice qué va a pasar */
.vas-a {
  margin: 0 0 var(--e3);
  font-size: 14px;
  color: var(--tinta-suave, #4a5a70);
  position: relative;
}

.vas-a b { color: var(--azul); }

/* "Qué hay que hacer": la instrucción corta del reverso */
.que-hacer {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 var(--e3);
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--color, var(--azul));
  border-radius: 8px;
  background: var(--color-suave, rgba(18,59,107,.10));
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--tinta, #14243a);
  animation: aparece 300ms ease backwards;
}

.que-hacer b { color: var(--color, var(--azul)); white-space: nowrap; }

/* --- mesa con más presencia --- */
.mesa {
  background:
    radial-gradient(circle 420px at 12% -10%, rgba(18,59,107,.05) 0%, transparent 100%),
    radial-gradient(circle 380px at 95% 8%, rgba(138,98,8,.045) 0%, transparent 100%),
    linear-gradient(180deg, #ffffff 0%, var(--bg-alt) 100%);
  box-shadow:
    inset 0 1px 0 #fff,
    0 1px 2px rgba(20, 36, 58, 0.05),
    0 18px 40px rgba(20, 36, 58, 0.07);
  animation: brisaMesa 6s ease-in-out infinite alternate;
}

@keyframes brisaMesa {
  from { background-position: 0% 0%, 100% 0%, 0 0; }
  to { background-position: 30px 20px, -25px 15px, 0 0; }
}

/* --- botón de tablero visible --- */
.enlace-tablero {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 650;
  color: var(--azul);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 6px 14px;
  box-shadow: var(--sombra-1);
  transition: border-color 140ms, transform 140ms, box-shadow 140ms;
}

.enlace-tablero:hover {
  border-color: var(--azul-medio);
  transform: translateY(-1px);
  box-shadow: var(--sombra-2);
}

@media (max-width: 560px) {
  .carta-hero { height: 108px; margin-left: calc(var(--e4) * -1); margin-right: calc(var(--e4) * -1); }
  .naipe .nombre { font-size: 9.5px; }
  .naipe .arriba, .naipe .pie-naipe { padding-left: 5px; padding-right: 5px; font-size: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .pantalla::before { animation: none; }
}

/* ---------------------------------------------------------------- campo matemático (MathLive) */
.campo-mate {
  min-height: 62px;
  font-size: 22px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radio-sm);
  background: var(--bg);
  text-align: center;
  --caret-color: var(--accent);
  --selection-background-color: #DBEAFE;
  --contains-highlight-background-color: transparent;
}

.campo-mate:focus-within,
.campo-mate:focus {
  outline: none;
  border-color: var(--azul-medio);
  background: var(--surface);
  box-shadow: 0 0 0 4px rgba(27, 84, 144, 0.12);
}

/* ==================================================================
   OPCIONES DE EJERCICIO (botones grandes, animados)
   El ejercicio deja de ser "texto + campo": se puede responder tocando.
   ================================================================== */

.opciones-ejercicio {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  width: 100%;
  margin: 6px 0 4px;
}

.opcion-ejercicio {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 14px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  font: inherit;
  color: var(--text);
  text-align: left;
  opacity: 0;
  animation: opcionEntra 380ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
  transition: border-color 140ms ease, background 140ms ease,
              transform 140ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 140ms ease;
}

@keyframes opcionEntra {
  from { opacity: 0; transform: translateY(10px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.opcion-ejercicio:hover {
  border-color: var(--azul-medio);
  background: var(--azul-claro);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(20, 36, 58, 0.08);
}

.opcion-ejercicio:focus-visible {
  outline: 3px solid var(--azul-medio);
  outline-offset: 2px;
}

.opcion-ejercicio .letra {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 99px;
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  transition: background 140ms, color 140ms;
}

.opcion-ejercicio .valor {
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.opcion-ejercicio.elegida {
  border-color: var(--azul-medio);
  background: var(--azul-claro);
  box-shadow: 0 0 0 3px rgba(27, 84, 144, 0.14);
}

.opcion-ejercicio.elegida .letra { background: var(--azul-medio); color: #fff; }

/* acierto: pulso verde */
.opcion-ejercicio.bien {
  border-color: var(--accent);
  background: var(--accent-claro);
  color: var(--accent-h);
  animation: pulsoOk 520ms cubic-bezier(0.22, 1, 0.36, 1);
}

.opcion-ejercicio.bien .letra { background: var(--accent); color: #fff; }

@keyframes pulsoOk {
  0%   { transform: scale(1); }
  45%  { transform: scale(1.035); }
  100% { transform: scale(1); }
}

/* error: sacudida */
.opcion-ejercicio.mal {
  border-color: #e7bdb9;
  background: var(--error-claro);
  color: var(--error);
  animation: sacudida 420ms ease;
}

@keyframes sacudida {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  45% { transform: translateX(5px); }
  70% { transform: translateX(-3px); }
}

.opciones-ejercicio.falta { animation: sacudida 420ms ease; }

/* confeti de la celebracion */
.confeti {
  position: absolute;
  top: 8px;
  width: 7px;
  height: 12px;
  border-radius: 2px;
  opacity: 0;
  animation: cae 1200ms cubic-bezier(0.3, 0.7, 0.4, 1) forwards;
  pointer-events: none;
  z-index: 5;
}

@keyframes cae {
  0%   { opacity: 1; transform: translateY(0) rotate(0deg); }
  100% { opacity: 0; transform: translateY(190px) rotate(320deg); }
}

.pista-linea {
  font-size: 13px;
  color: var(--gold);
  background: var(--gold-soft);
  border-radius: 8px;
  padding: 8px 12px;
  margin: 0 0 12px;
  width: 100%;
  text-align: left;
}

@media (max-width: 520px) {
  .opciones-ejercicio { grid-template-columns: 1fr; }
  .opcion-ejercicio .valor { font-size: 17px; }
}