/* =========================================================
   Fijación de Precios — estilos compartidos (móvil primero)
   ========================================================= */

:root {
  /* Paleta */
  --azul-900: #0C2B4E;
  --azul-700: #1A3D64;
  --azul-500: #1D546C;
  --fondo: #F4F4F4;
  --acento: #F2B544;
  --blanco: #FFFFFF;
  --texto: #0C2B4E;

  /* Tipografía */
  --font-titulo: "Unbounded", "Arial Black", system-ui, sans-serif;
  --font-texto: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Medidas */
  --contenedor: 1100px;
  --gutter: 1.25rem;
  --radio-sm: 0.75rem;
  --radio: 1.25rem;
  --radio-lg: 2rem;
  --pill: 999px;
  --nav-alto: 4rem;
  --nav-top: 0.75rem;

  /* Sombras */
  --sombra-suave: 0 10px 30px -12px rgba(12, 43, 78, 0.18);
  --sombra-media: 0 18px 40px -16px rgba(12, 43, 78, 0.28);
  --sombra-nav: 0 12px 32px -10px rgba(12, 43, 78, 0.22);

  --transicion: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-alto) + var(--nav-top) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-texto);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--texto);
  background: var(--fondo);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

button {
  font: inherit;
  cursor: pointer;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-titulo);
  font-weight: 800;
  line-height: 1.08;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1em;
}

/* Foco: azul oscuro sobre fondos claros, amarillo sobre fondos oscuros */
:focus-visible {
  outline: 3px solid var(--azul-900);
  outline-offset: 3px;
}

.section--dark :focus-visible,
.cta__card :focus-visible,
.footer :focus-visible,
.page-act :focus-visible {
  outline-color: var(--acento);
}

/* La barra de navegación es blanca en todas las páginas */
.page-act .nav :focus-visible {
  outline-color: var(--azul-900);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--contenedor);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: 4rem;
}

/* El primer bloque deja espacio para la navbar flotante */
main > .section:first-child {
  padding-top: calc(var(--nav-alto) + var(--nav-top) + 3rem);
}

/* Variantes de fondo (como los bloques de color de la referencia) */
.section--dark {
  background: var(--azul-900);
  color: var(--blanco);
}

.section--alt {
  background: var(--azul-700);
  color: var(--blanco);
}

/* Borde inferior curvo, como el hero de la referencia */
.section--curve {
  border-bottom-left-radius: 50% 2.5rem;
  border-bottom-right-radius: 50% 2.5rem;
}

/* =========================================================
   NAVBAR — píldora blanca flotante
   ========================================================= */
.nav {
  position: fixed;
  top: var(--nav-top);
  left: 0;
  right: 0;
  z-index: 100;
  padding-inline: var(--gutter);
  pointer-events: none; /* solo la píldora recibe clics */
}

.nav__pill {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--contenedor);
  min-height: var(--nav-alto);
  margin-inline: auto;
  padding: 0.5rem 0.5rem 0.5rem 1.25rem;
  background: var(--blanco);
  border-radius: var(--pill);
  box-shadow: var(--sombra-nav);
  pointer-events: auto;
  transition: box-shadow var(--transicion);
}

.nav.is-scrolled .nav__pill {
  box-shadow: var(--sombra-media);
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  font-family: var(--font-titulo);
  font-weight: 800;
  font-size: 0.85rem;
  line-height: 1.1;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--azul-900);
  letter-spacing: -0.01em;
}

.nav__links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--azul-900);
  transition: color var(--transicion), background-color var(--transicion);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--azul-500);
}

.nav .nav__cta {
  display: none;
}

/* Botón hamburguesa */
.nav__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--azul-900);
}

.nav__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--blanco);
  transition: transform var(--transicion), opacity var(--transicion);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Panel desplegable en móvil */
.nav__menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  padding: 1rem;
  background: var(--blanco);
  border-radius: var(--radio-lg);
  box-shadow: var(--sombra-nav);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transicion), transform var(--transicion), visibility var(--transicion);
}

.nav__menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.nav__menu .nav__link {
  padding: 0.75rem 1rem;
  border-radius: var(--pill);
}

.nav__menu .nav__link:hover,
.nav__menu .nav__link.is-active {
  background: var(--fondo);
}

.nav__menu .btn {
  width: 100%;
  margin-top: 0.75rem;
}

@media (min-width: 900px) {
  .nav__pill {
    padding-left: 1.75rem;
  }

  .nav__logo {
    font-size: 0.95rem;
  }

  .nav__toggle {
    display: none;
  }

  /* El menú vuelve a la píldora y se centra */
  .nav__menu {
    position: static;
    padding: 0;
    background: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    flex: 1;
    display: flex;
    justify-content: center;
  }

  .nav__menu .btn {
    display: none;
  }

  .nav__links {
    display: flex;
    gap: 0.25rem;
  }

  .nav__menu .nav__link {
    padding: 0.5rem 0.9rem;
  }

  .nav .nav__cta {
    display: inline-flex;
  }
}

/* =========================================================
   COMPONENTES
   ========================================================= */

/* ---------- Botones (píldora) ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid transparent;
  border-radius: var(--pill);
  font-family: var(--font-titulo);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--transicion), box-shadow var(--transicion),
    background-color var(--transicion), color var(--transicion), border-color var(--transicion);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn__icon {
  display: inline-block;
  transition: transform var(--transicion);
}

.btn:hover .btn__icon {
  transform: translateX(3px);
}

/* Primario: acento con texto azul */
.btn--primary {
  background: var(--acento);
  color: var(--azul-900);
  box-shadow: 0 8px 20px -8px rgba(242, 181, 68, 0.7);
}

.btn--primary:hover {
  box-shadow: 0 12px 26px -8px rgba(242, 181, 68, 0.85);
}

/* Secundario: contorno */
.btn--outline {
  background: transparent;
  color: var(--azul-900);
  border-color: currentColor;
}

.btn--outline:hover {
  background: var(--azul-900);
  border-color: var(--azul-900);
  color: var(--blanco);
}

/* Secundario sobre fondos oscuros */
.section--dark .btn--outline,
.section--alt .btn--outline,
.btn--outline.btn--light {
  color: var(--blanco);
}

.section--dark .btn--outline:hover,
.section--alt .btn--outline:hover,
.btn--outline.btn--light:hover {
  background: var(--blanco);
  border-color: var(--blanco);
  color: var(--azul-900);
}

/* Botón de la navbar (como el botón de color de la referencia) */
.btn--nav {
  min-height: 3rem;
  background: var(--azul-900);
  color: var(--blanco);
}

.btn--nav:hover {
  background: var(--azul-700);
}

/* ---------- Etiqueta pequeña sobre títulos ---------- */
.eyebrow {
  display: inline-block;
  margin-bottom: 1rem;
  font-family: var(--font-texto);
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--azul-500);
}

.eyebrow--pill {
  padding: 0.35rem 0.85rem;
  border-radius: var(--pill);
  background: var(--blanco);
  color: var(--azul-900);
  box-shadow: var(--sombra-suave);
}

.section--dark .eyebrow:not(.eyebrow--pill),
.section--alt .eyebrow:not(.eyebrow--pill) {
  color: var(--acento);
}

/* ---------- Títulos ---------- */
.title {
  font-family: var(--font-titulo);
  font-weight: 900;
  font-size: clamp(1.75rem, 6vw + 0.5rem, 3.5rem);
  line-height: 1.02;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.title--lg {
  font-size: clamp(2.25rem, 9vw + 0.5rem, 5rem);
}

.title--sm {
  font-size: clamp(1.35rem, 3vw + 0.5rem, 2.25rem);
}

.title--center {
  text-align: center;
}

/* Cada línea del título en su propio bloque */
.title__line {
  display: block;
}

/* Línea resaltada en otro color */
.title__highlight {
  color: var(--azul-500);
}

.section--dark .title__highlight,
.section--alt .title__highlight,
.title__highlight--accent {
  color: var(--acento);
}

/* ---------- Tarjeta ---------- */
.card {
  position: relative;
  padding: 1.5rem;
  background: var(--blanco);
  border-radius: var(--radio);
  box-shadow: var(--sombra-suave);
  color: var(--texto);
  transition: transform var(--transicion), box-shadow var(--transicion);
}

.card--hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--sombra-media);
}

.card--dark {
  background: var(--azul-900);
  color: var(--blanco);
}

.card--secondary {
  background: var(--azul-500);
  color: var(--blanco);
}

/* =========================================================
   HERO (#inicio)
   ========================================================= */
.hero {
  overflow: hidden;
  isolation: isolate;
  padding-bottom: 6rem; /* espacio para la onda inferior */
}

/* Forma secundaria: en móvil es una banda curva detrás del gato */
.hero__shape {
  position: absolute;
  z-index: -1;
  top: 0;
  left: 0;
  right: 0;
  height: calc(var(--nav-alto) + var(--nav-top) + 17rem);
  background: var(--azul-500);
  border-bottom-left-radius: 50% 3rem;
  border-bottom-right-radius: 50% 3rem;
}

.hero__shape svg {
  display: none;
}

.hero__grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* En móvil el gato va arriba del texto */
.hero__media {
  order: -1;
  display: flex;
  justify-content: center;
}

.hero__cat {
  width: auto;
  height: 16rem;
  filter: drop-shadow(0 18px 24px rgba(12, 43, 78, 0.45));
  animation: hero-float 5s ease-in-out infinite;
}

@keyframes hero-float {
  0%, 100% { transform: translateY(0) rotate(-1.5deg); }
  50%      { transform: translateY(-14px) rotate(1.5deg); }
}

.hero__title .title__line {
  white-space: nowrap;
}

.hero__title {
  font-size: clamp(1.1rem, 6.1vw, 2.75rem);
  line-height: 1;
  margin-bottom: 1.25rem;
}

.hero__text {
  max-width: 34rem;
  font-size: 0.98rem;
  color: rgba(255, 255, 255, 0.86);
  margin-bottom: 1.75rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero__team {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin: 0;
}

.hero__team-label {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--acento);
}

/* Nombres en píldoras pequeñas que bajan de línea si no caben */
.hero__team-names {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero__team-names li {
  padding: 0.35rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--pill);
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--blanco);
}

/* Onda inferior hacia el fondo general */
.hero__wave {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 3.5rem;
  fill: var(--fondo);
}

@media (min-width: 900px) {
  .hero {
    display: flex;
    align-items: center;
    min-height: min(100vh, 52rem);
    padding-bottom: 8rem;
  }

  /* Forma ondulada a la derecha, como la de la referencia */
  .hero__shape {
    left: auto;
    bottom: 0;
    width: 50%;
    height: auto;
    background: none;
    border-radius: 0;
  }

  .hero__shape svg {
    display: block;
    width: 100%;
    height: 100%;
    fill: var(--azul-500);
  }

  .hero__grid {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    align-items: center;
    gap: 2rem;
  }

  .hero__media {
    order: 0;
  }

  .hero__cat {
    height: clamp(24rem, 38vw, 32rem);
  }

  .hero__title {
    font-size: clamp(1.6rem, 2.6vw, 2.5rem);
  }

  .hero__wave {
    height: 5.5rem;
  }
}

/* ---------- Lista con checks (reutilizable) ---------- */
.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.checklist__item {
  position: relative;
  padding-left: 2.1rem;
  font-size: 0.95rem;
  line-height: 1.6;
}

.checklist__item strong {
  font-weight: 700;
  color: var(--azul-900);
}

/* Círculo acento con check dibujado en CSS */
.checklist__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15rem;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--acento);
}

.checklist__item::after {
  content: "";
  position: absolute;
  left: 0.48rem;
  top: 0.38rem;
  width: 0.38rem;
  height: 0.68rem;
  border: solid var(--azul-900);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

/* =========================================================
   DECREMENTO (#decremento)
   ========================================================= */
.concepto__grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.concepto__media {
  display: flex;
  justify-content: center;
}

/* Círculo claro con borde, el gato sobresale por arriba */
.concepto__circle {
  position: relative;
  width: min(78vw, 22rem);
  aspect-ratio: 1;
  margin-top: 3rem;
  border-radius: 50%;
  background: var(--blanco);
  border: 6px solid rgba(29, 84, 108, 0.14);
  box-shadow: var(--sombra-media), inset 0 -18px 40px -20px rgba(29, 84, 108, 0.25);
}

.concepto__cat {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 4%;
  width: auto;
  height: 118%;
  /* Espejado para que señale hacia el texto (a la derecha) */
  transform: translateX(-50%) scaleX(-1);
  filter: drop-shadow(0 14px 18px rgba(12, 43, 78, 0.22));
}

/* Manchas decorativas */
.concepto__blob {
  position: absolute;
  z-index: 1;
  display: block;
}

.concepto__blob--1 {
  top: 6%;
  left: -8%;
  width: 3.2rem;
  height: 3rem;
  background: var(--acento);
  border-radius: 58% 42% 55% 45% / 46% 60% 40% 54%;
}

.concepto__blob--2 {
  top: 34%;
  left: -12%;
  width: 1.4rem;
  height: 1.3rem;
  background: var(--azul-500);
  border-radius: 46% 54% 40% 60% / 55% 42% 58% 45%;
}

.concepto__blob--3 {
  bottom: 2%;
  left: 4%;
  width: 2.2rem;
  height: 2rem;
  background: var(--azul-500);
  border-radius: 60% 40% 52% 48% / 42% 58% 42% 58%;
}

.concepto__blob--4 {
  right: -6%;
  bottom: 14%;
  width: 2.8rem;
  height: 2.6rem;
  background: var(--acento);
  border-radius: 42% 58% 60% 40% / 56% 44% 56% 44%;
}

.concepto__blob--5 {
  top: 18%;
  right: -10%;
  width: 1.1rem;
  height: 1rem;
  background: var(--acento);
  border-radius: 50% 50% 44% 56% / 60% 40% 60% 40%;
}

.concepto__title {
  font-size: clamp(1.1rem, 5.2vw, 2.1rem);
  line-height: 1.08;
}

.concepto__title .title__line:first-child {
  white-space: nowrap;
}

.concepto__text {
  font-size: 1rem;
  margin-bottom: 1.75rem;
}

.concepto__subtitle {
  margin-bottom: 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--azul-500);
}

@media (min-width: 900px) {
  .concepto__grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 4rem;
  }

  .concepto__circle {
    width: min(100%, 24rem);
    margin-top: 4rem;
  }

  .concepto__title {
    font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  }
}

/* ---------- Botón pequeño ---------- */
.btn--sm {
  min-height: 2.25rem;
  padding: 0.55rem 1.1rem;
  font-size: 0.62rem;
}

/* =========================================================
   FÓRMULAS
   ========================================================= */
.formula {
  margin: 0 0 1.75rem;
  padding: 1.1rem 1.25rem 1.6rem;
  border-left: 6px solid var(--acento);
  border-radius: var(--radio);
  background: var(--blanco);
  box-shadow: var(--sombra-suave);
}

.opc__list .formula {
  margin: 0;
}

.formula__label {
  display: block;
  margin-bottom: 1.1rem;
  font-family: var(--font-texto);
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--azul-500);
}

/* Fórmula con tipografía matemática; después del "=" baja al siguiente renglón */
.formula__eq {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  column-gap: 0.15em;
  margin: 0;
  font-family: "STIX Two Text", Georgia, serif;
  font-weight: 500;
  font-size: clamp(1.0625rem, 0.95rem + 0.6vw, 1.1875rem);
  line-height: 1.45;
  color: var(--azul-900);
  text-align: center;
}

.formula__res {
  white-space: nowrap;
}

.formula__rhs {
  flex-basis: 100%;
  max-width: 100%;
}

.formula__var {
  font-style: italic;
  white-space: nowrap;
}

.formula__op {
  display: inline-block;
  margin-inline: 0.22em;
  font-style: normal;
  font-size: 1.2em;
  line-height: 1;
  color: var(--acento);
}

/* Paréntesis pegados a lo que encierran (nunca quedan solos en un renglón) */
.formula__grupo {
  white-space: nowrap;
}

.formula__grupo .formula__op {
  margin-inline: 0.12em;
}

/* Solo en pantallas muy angostas un término puede partirse entre palabras */
@media (max-width: 359px) {
  .formula__var {
    white-space: normal;
  }
}

@media (min-width: 600px) {
  .formula {
    padding: 1.25rem 1.5rem 1.9rem;
  }

  .formula__eq {
    font-size: clamp(1.5rem, 0.6rem + 0.9vw, 1.75rem);
  }
}

/* =========================================================
   ESTRATEGIAS (#estrategias)
   ========================================================= */
.estrategias {
  overflow: hidden;
  isolation: isolate;
}

/* Gato muy tenue como marca de agua, detrás del encabezado */
.estrategias__watermark {
  position: absolute;
  z-index: -1;
  top: 2rem;
  right: -4rem;
  width: auto;
  height: 22rem;
  opacity: 0.06;
  transform: rotate(-8deg);
  pointer-events: none;
  user-select: none;
}

.estrategias__header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 3rem;
}

.estrategias__header .title {
  margin-bottom: 0;
}

/* Un grupo por estrategia, cada uno con su encabezado */
.estrategias__group {
  --group-color: var(--azul-900);
}

.estrategias__group + .estrategias__group {
  margin-top: 3.5rem;
  padding-top: 3.5rem;
  border-top: 1px solid rgba(12, 43, 78, 0.16);
}

.estrategias__group--mid {
  --group-color: var(--azul-500);
}

/* Barra del color del grupo: une el encabezado con sus cards */
.estrategias__group-title {
  margin: 0 0 1.5rem;
  padding-left: 1rem;
  border-left: 0.35rem solid var(--group-color);
  font-family: var(--font-titulo);
  font-weight: 800;
  font-size: clamp(1rem, 2.4vw + 0.5rem, 1.4rem);
  line-height: 1.2;
  text-transform: uppercase;
  color: var(--group-color);
}

@media (min-width: 900px) {
  .estrategias__watermark {
    right: max(-2rem, calc((100vw - var(--contenedor)) / 2 - 8rem));
    height: 30rem;
  }
}

/* =========================================================
   FLIP CARDS
   Horizontales (16:9): texto a la izquierda, objeto recortado
   sobre un círculo que sale por la esquina superior derecha
   ========================================================= */
.flip-grid {
  display: grid;
  grid-template-columns: 1fr;
  align-items: start;
  gap: 2.75rem 1.25rem;
  padding-top: 1rem; /* espacio para el objeto que sobresale */
}

@media (min-width: 600px) {
  .flip-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .flip-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem 1.75rem;
  }
}

.flip-card {
  --card-bg: var(--azul-900);
  --card-fg: var(--blanco);
  --card-muted: rgba(255, 255, 255, 0.78);
  --circle: var(--acento);
  --btn-bg: var(--acento);
  --btn-fg: var(--azul-900);
  /* Las medidas internas (cqi) siguen al ancho de la card */
  container-type: inline-size;
  aspect-ratio: 16 / 9;
  perspective: 1400px;
  cursor: pointer;
  border-radius: var(--radio-lg);
  -webkit-tap-highlight-color: transparent;
  transition: translate 0.35s ease;
}

/* "translate" no choca con el transform de la animación .reveal */
.js .flip-card.reveal {
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1), translate 0.35s ease;
  transition-delay: var(--reveal-delay, 0s), var(--reveal-delay, 0s), 0s;
}

.flip-card--mid {
  --card-bg: var(--azul-500);
  --card-muted: rgba(255, 255, 255, 0.85);
}

/* Card blanca: título, círculo y botón del color del grupo */
.flip-card--light {
  --card-bg: var(--blanco);
  --card-fg: var(--group-color);
  --card-muted: var(--azul-700);
  --circle: var(--group-color);
  --btn-bg: var(--group-color);
  --btn-fg: var(--blanco);
}

@media (hover: hover) {
  .flip-card:hover {
    translate: 0 -6px;
  }

  .flip-card:not(.is-flipped):hover .flip-card__obj {
    transform: translateY(-5%) scale(1.07);
  }
}

.flip-card:focus-visible {
  outline-offset: 4px;
  translate: 0 -6px;
}

.flip-card__inner {
  display: grid;
  height: 100%;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.3, 0.7, 0.2, 1);
}

.flip-card.is-flipped .flip-card__inner {
  transform: rotateY(180deg);
}

/* Frente y reverso ocupan la misma celda y miden lo mismo */
.flip-card__face {
  grid-area: 1 / 1;
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 7cqi 6cqi 6cqi;
  border-radius: var(--radio-lg);
  background: var(--card-bg);
  color: var(--card-fg);
  box-shadow: var(--sombra-suave);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  /* La visibilidad cambia cuando la card queda de canto (~0.13s del giro).
     Así la cara de atrás nunca se ve al revés, aunque el navegador del
     celular ignore backface-visibility (pasa con la imagen y su sombra). */
  transition: box-shadow var(--transicion), visibility 0s linear 0.13s;
}

.flip-card__front {
  transform: rotateY(0deg);
}

.flip-card__back,
.flip-card.is-flipped .flip-card__front {
  visibility: hidden;
}

.flip-card.is-flipped .flip-card__back {
  visibility: visible;
}

.flip-card:hover .flip-card__face {
  box-shadow: var(--sombra-media);
}

.flip-card__back {
  transform: rotateY(180deg);
  overflow: hidden;
}

/* ---- Frente ---- */

/* Capa recortada: el círculo se corta en el borde de la card */
.flip-card__deco {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
  pointer-events: none;
}

.flip-card__circle {
  position: absolute;
  top: -12cqi;
  right: -12cqi;
  width: 56cqi;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--circle);
}

/* Objeto recortado: grande y sobresaliendo por arriba */
.flip-card__obj {
  position: absolute;
  z-index: 2;
  top: -7cqi;
  right: 2cqi;
  width: 40cqi;
  height: 52cqi;
  object-fit: contain;
  filter: drop-shadow(0 12px 12px rgba(0, 0, 0, 0.32));
  transition: transform 0.45s cubic-bezier(0.3, 0.7, 0.2, 1);
  pointer-events: none;
}

.flip-card__head {
  position: relative;
  z-index: 1;
  width: 50cqi;
}

.flip-card__title {
  margin: 0;
  font-family: var(--font-titulo);
  font-weight: 900;
  font-style: italic;
  font-size: 4.8cqi;
  line-height: 1.05;
  text-transform: uppercase;
  color: var(--card-fg);
}

.flip-card__sub {
  margin: 2.2cqi 0 0;
  font-size: 3.2cqi;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--card-muted);
}

.flip-card__btn {
  position: relative;
  z-index: 1;
  align-self: flex-start;
  margin-top: auto;
  min-height: 0;
  padding: 2.2cqi 4.4cqi;
  font-size: max(0.6rem, 2.8cqi);
  background: var(--btn-bg);
  color: var(--btn-fg);
  box-shadow: 0 8px 16px -8px rgba(0, 0, 0, 0.45);
}

.flip-card:hover .flip-card__btn {
  transform: translateY(-2px);
}

/* ---- Reverso: mismo tamaño; si el texto no cabe, scroll interno ---- */
.flip-card__back {
  padding: 5cqi 6cqi 5cqi;
}

.flip-card__title--sm {
  flex-shrink: 0;
  margin-bottom: 0.6rem;
  font-size: 0.8rem;
  color: var(--card-fg);
}

.flip-card__list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
  margin: 0 -0.5rem 0.75rem 0;
  padding: 0 0.5rem 0 0;
  display: grid;
  align-content: start;
  gap: 0.45rem;
  font-size: 0.84rem; /* ~13.5px */
  line-height: 1.45;
  color: var(--card-muted);
  scrollbar-width: thin;
  scrollbar-color: var(--acento) transparent;
  /* Desvanecido abajo: indica que hay más texto al hacer scroll */
  -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 1.5rem), transparent);
  mask-image: linear-gradient(to bottom, #000 calc(100% - 1.5rem), transparent);
  padding-bottom: 1.25rem;
}

.flip-card__list li {
  position: relative;
  padding-left: 0.95rem;
}

.flip-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--acento);
}

.flip-card__list strong {
  font-weight: 700;
  color: var(--card-fg);
}

.flip-card__back .flip-card__btn {
  flex-shrink: 0;
}

/* ---------- Botón blanco sólido ---------- */
.btn--white {
  background: var(--blanco);
  color: var(--azul-900);
  box-shadow: 0 10px 24px -10px rgba(0, 0, 0, 0.45);
}

.btn--white:hover {
  background: var(--acento);
}

/* =========================================================
   BANNER DE ACTIVIDAD (#actividad)
   ========================================================= */
.cta {
  padding-top: 7rem;
}

.cta__card {
  position: relative;
  display: grid;
  gap: 2rem;
  max-width: 900px;
  margin-inline: auto;
  padding: 0 1.5rem 2.5rem;
  border-radius: var(--radio-lg);
  background: var(--azul-900);
  color: var(--blanco);
  box-shadow: 0 30px 60px -24px rgba(12, 43, 78, 0.55);
  text-align: center;
}

/* Capa recortada para la marca de agua (el celular sí sobresale) */
.cta__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
  pointer-events: none;
}

.cta__watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  font-family: var(--font-titulo);
  font-weight: 900;
  font-size: clamp(5rem, 22vw, 12rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blanco);
  opacity: 0.05;
  white-space: nowrap;
  transform: translate(-50%, -50%);
  user-select: none;
}

.cta__media {
  position: relative;
  display: flex;
  justify-content: center;
  margin-top: -5rem; /* sobresale por arriba de la tarjeta */
}

.cta__content {
  position: relative;
}

.cta__title {
  font-size: clamp(1.8rem, 8vw, 3rem);
  margin-bottom: 1rem;
}

.cta__title-accent {
  color: var(--acento);
  font-style: italic;
}

.cta__topics {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  gap: 0.35rem;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.82);
}

/* ---------- Celular CSS ---------- */
.phone {
  position: relative;
  width: 11.5rem;
  aspect-ratio: 9 / 18.5;
  padding: 0.55rem;
  border-radius: 2rem;
  background: #071C33;
  box-shadow:
    inset 0 0 0 2px rgba(255, 255, 255, 0.12),
    0 28px 40px -16px rgba(0, 0, 0, 0.55);
  transform: rotate(-8deg);
}

.phone__notch {
  position: absolute;
  z-index: 2;
  top: 0.95rem;
  left: 50%;
  width: 3.4rem;
  height: 0.9rem;
  border-radius: var(--pill);
  background: #071C33;
  transform: translateX(-50%);
}

.phone__screen {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  height: 100%;
  padding: 2.1rem 0.8rem 0.9rem;
  border-radius: 1.5rem;
  background: var(--fondo);
  color: var(--azul-900);
  text-align: left;
}

.phone__timer {
  height: 0.45rem;
  border-radius: var(--pill);
  background: rgba(12, 43, 78, 0.12);
  overflow: hidden;
}

.phone__timer-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--acento);
  transform-origin: left center;
  animation: phone-timer 8s linear infinite;
}

@keyframes phone-timer {
  from { transform: scaleX(1); }
  to   { transform: scaleX(0.08); }
}

.phone__counter {
  margin: 0.15rem 0 0;
  font-family: var(--font-titulo);
  font-weight: 700;
  font-size: 0.55rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--azul-500);
}

/* Renglones de la "pregunta" */
.phone__line {
  display: block;
  height: 0.4rem;
  border-radius: var(--pill);
  background: rgba(12, 43, 78, 0.18);
}

.phone__line--short {
  width: 65%;
}

.phone__answers {
  display: grid;
  gap: 0.45rem;
  margin-top: auto;
}

.phone__answer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.6rem;
  border-radius: 0.8rem;
  color: var(--blanco);
}

.phone__answer b {
  display: grid;
  place-items: center;
  flex: none;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  font-family: var(--font-titulo);
  font-size: 0.62rem;
}

.phone__answer i {
  flex: 1;
  height: 0.32rem;
  border-radius: var(--pill);
  background: rgba(255, 255, 255, 0.45);
}

.phone__answer--a { background: var(--azul-500); }
.phone__answer--b { background: var(--acento); color: var(--azul-900); }
.phone__answer--b b { background: rgba(12, 43, 78, 0.14); }
.phone__answer--b i { background: rgba(12, 43, 78, 0.3); }
.phone__answer--c { background: var(--azul-700); }

@media (min-width: 768px) {
  .cta {
    padding-top: 8rem;
  }

  .cta__card {
    grid-template-columns: 15rem 1fr;
    align-items: center;
    gap: 2.5rem;
    padding: 2.5rem 3.5rem 2.5rem 2.5rem;
    text-align: left;
  }

  /* El celular sube por encima del borde y se alinea abajo */
  .cta__media {
    align-self: end;
    margin-top: -7rem;
    margin-bottom: -0.5rem;
  }

  .phone {
    width: 12.5rem;
  }

  .cta__topics {
    font-size: 0.92rem;
  }
}

/* ---------- Botón oscuro (como el botón de color de la referencia) ---------- */
.btn--dark {
  background: var(--azul-900);
  color: var(--blanco);
  box-shadow: 0 10px 24px -10px rgba(12, 43, 78, 0.6);
}

.btn--dark:hover {
  background: var(--azul-700);
}

/* =========================================================
   PRODUCTOS OPCIONALES (#opcionales)
   ========================================================= */
.opc {
  overflow: hidden;
}

/* Móvil: título → collage → rectángulos */
.opc__grid {
  display: grid;
  grid-template-areas:
    "title"
    "collage"
    "list";
  gap: 2rem;
}

.opc__title {
  grid-area: title;
  margin: 0;
  font-size: clamp(1.4rem, 6vw, 2.6rem);
}

.opc__title-accent {
  font-style: italic;
}

.opc__list {
  grid-area: list;
  display: grid;
  gap: 1rem;
}

.opc__eyebrow {
  margin: 0.75rem 0 0;
}

/* Rectángulos apilados */
.opc-box {
  padding: 1.15rem 1.35rem;
  border-radius: var(--radio-sm);
  background: var(--azul-900);
  color: var(--blanco);
  box-shadow: 0 14px 28px -14px rgba(12, 43, 78, 0.6);
}

.opc-box__title {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.01em;
  color: var(--acento);
}

.opc-box__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.86);
}

/* Objetos recortados flotando sobre el círculo */
.opc__collage {
  grid-area: collage;
  position: relative;
  width: min(100%, 30rem);
  aspect-ratio: 1;
  margin-inline: auto;
}

.opc__circle {
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background: var(--azul-500);
  box-shadow: var(--sombra-media);
}

.opc__obj {
  position: absolute;
  height: auto;
  filter: drop-shadow(0 18px 16px rgba(0, 0, 0, 0.35));
  animation: opc-flotar 6s ease-in-out infinite alternate;
}

.opc__obj--refri {
  z-index: 1;
  top: 7%;
  right: 8%;
  width: 34%;
  animation-duration: 7s;
  animation-delay: -3.5s;
}

.opc__obj--pc {
  z-index: 2;
  top: 17%;
  left: 3%;
  width: 52%;
  animation-duration: 6s;
  animation-delay: -1.2s;
}

.opc__obj--auto {
  z-index: 3;
  bottom: 7%;
  left: 1%;
  width: 70%;
  animation-duration: 6.5s;
  animation-delay: -5s;
}

@keyframes opc-flotar {
  from {
    transform: translateY(0);
  }

  to {
    transform: translateY(-4%);
  }
}

@media (min-width: 900px) {
  .opc__grid {
    grid-template-columns: 1.05fr 0.95fr;
    grid-template-areas:
      "title collage"
      "list  collage";
    grid-template-rows: auto 1fr;
    column-gap: 3.5rem;
    row-gap: 1.75rem;
  }

  .opc__title {
    font-size: clamp(1.6rem, 2.6vw, 2.2rem);
  }

  .opc__collage {
    align-self: center;
  }

  .opc__title .title__line:first-child {
    white-space: nowrap;
  }
}

/* =========================================================
   REFERENCIAS (#referencias)
   ========================================================= */
.ref__title {
  margin-bottom: 3rem;
}

.ref__title-accent {
  font-style: italic;
}

/* Dos tarjetas lado a lado (una columna en móvil) */
.ref__grid {
  display: grid;
  gap: 2.5rem;
  max-width: 54rem;
  margin-inline: auto;
}

/* Si una tarjeta está abierta, la otra no se estira */
.ref__grid:has(.is-expanded) {
  align-items: start;
}

.ref-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
  border-radius: var(--radio);
  background: var(--blanco);
  box-shadow: var(--sombra-media);
}

/* Número en la esquina */
.ref-card__num {
  position: absolute;
  top: -0.9rem;
  right: 1.25rem;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--acento);
  color: var(--azul-900);
  font-family: var(--font-titulo);
  font-weight: 800;
  font-size: 0.85rem;
  box-shadow: 0 6px 14px -6px rgba(242, 181, 68, 0.9);
}

/* Foto de la tarjeta (ocupa el lugar del mapa de la referencia) */
.ref-card__map {
  height: 10rem;
  overflow: hidden;
  border-radius: calc(var(--radio) - 0.5rem);
  background: var(--fondo);
}

.ref-card__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ref-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.25rem 0.75rem 0.75rem;
}

.ref-card__title {
  margin-bottom: 0.85rem;
  font-family: var(--font-titulo);
  font-weight: 800;
  font-style: italic;
  font-size: 0.9rem;
  line-height: 1.25;
  text-transform: uppercase;
  color: var(--azul-900);
}

.ref-card__text {
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--azul-700);
}

.ref-card__text p + p,
.ref-card__more p {
  margin-top: 0.85rem;
}

/* Cerrada: solo asoma el inicio del siguiente párrafo y se desvanece */
.js .ref-card__more {
  position: relative;
  max-height: 3.25rem;
  overflow: hidden;
  transition: max-height 0.5s ease;
}

.js .ref-card__more::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), var(--blanco) 85%);
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.js .ref-card.is-expanded .ref-card__more::after {
  opacity: 0;
}

/* Botón con contorno a todo el ancho (como "Llega con Waze") */
.ref-card__toggle {
  width: 100%;
  margin-top: auto;
  color: var(--azul-500);
}

/* Sin JS todo el texto queda visible y el botón no hace falta */
html:not(.js) .ref-card__toggle {
  display: none;
}

/* Recuadro de la referencia bibliográfica */
.ref-cite {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  max-width: 54rem;
  margin: 3rem auto 0;
  padding: 1.75rem 1.5rem;
  border: 2px dashed rgba(29, 84, 108, 0.35);
  border-radius: var(--radio);
  background: var(--blanco);
  text-align: center;
}

.ref-cite__text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--azul-900);
}

/* La cursiva se inclina sobre el espacio siguiente */
.ref-cite__text em {
  padding-right: 0.12em;
}

/* ---------- Pie de página ---------- */
.footer {
  padding-block: 1.1rem;
  background: var(--azul-900);
  color: var(--blanco);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  font-family: var(--font-titulo);
  font-weight: 800;
  font-size: 0.85rem;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--blanco);
}

.footer__top {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--acento);
}

.footer__top:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 768px) {
  .ref__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .ref-cite {
    flex-direction: row;
    justify-content: space-between;
    padding: 1.75rem 2rem;
    text-align: left;
  }

  /* Sangría francesa, como en APA */
  .ref-cite__text {
    padding-left: 2rem;
    text-indent: -2rem;
  }

  .ref-cite__btn {
    flex-shrink: 0;
  }
}

/* =========================================================
   ANIMACIÓN AL HACER SCROLL
   Solo se oculta si hay JS (clase .js en <html>)
   ========================================================= */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
  transition-delay: var(--reveal-delay, 0s);
}

.js .reveal--left {
  transform: translateX(-36px);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }

  .hero__cat,
  .phone__timer-fill {
    animation: none;
  }

  .phone__timer-fill {
    transform: scaleX(0.6);
  }

  /* Flip cards: fundido en lugar de giro */
  .flip-card__inner,
  .flip-card.is-flipped .flip-card__inner,
  .flip-card__back {
    transform: none;
  }

  .flip-card__face {
    transition-property: opacity, visibility, box-shadow !important;
    transition-duration: 0.35s !important;
    transition-delay: 0s !important;
  }

  .flip-card__front {
    transform: none;
  }

  .flip-card__back,
  .flip-card.is-flipped .flip-card__front {
    opacity: 0;
    visibility: hidden;
  }

  .flip-card.is-flipped .flip-card__back {
    opacity: 1;
    visibility: visible;
  }

  .btn:hover,
  .card--hover:hover,
  .flip-card:not(.is-flipped):hover .flip-card__obj {
    transform: none;
  }

  .opc__obj {
    animation: none;
  }

  .flip-card:hover,
  .flip-card:focus-visible {
    translate: none;
  }
}

/* ---------- Pantallas medianas y grandes ---------- */
@media (min-width: 768px) {
  :root {
    --gutter: 2rem;
    --nav-top: 1.25rem;
  }

  .section {
    padding-block: 6rem;
  }

  .section--curve {
    border-bottom-left-radius: 50% 4rem;
    border-bottom-right-radius: 50% 4rem;
  }

  .card {
    padding: 2rem;
  }
}