/* ============================================================
   EL CEREBRO QUE SANA — Landing page
   Estilos: móvil primero, variables de marca, sin dependencias
   externas (stack de sistema). Listo para Hostinger.
   ============================================================ */

/* ---------- Variables de marca ---------- */
:root {
  /* Paleta oficial del proyecto */
  --violeta: #6C2BD9;
  --violeta-claro: #8B5CF6;
  --teal: #2DD4BF;
  --dorado: #F5C518;
  --oscuro: #1A0B2E;
  --oscuro-2: #241040;
  --oscuro-3: #2E1650;
  --texto: #EDE7F7;
  --texto-suave: #B8A9D4;
  --fondo: #0F061C;

  /* Fuentes de sistema (sin CDN) */
  --fuente-titulos: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --fuente-texto: "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  /* Radios y sombras */
  --radio: 16px;
  --radio-sm: 10px;
  --sombra: 0 10px 40px rgba(0, 0, 0, 0.45);
  --sombra-violeta: 0 10px 34px rgba(108, 43, 217, 0.45);

  /* Gradientes animados */
  --grad-1: linear-gradient(135deg, var(--violeta), #3B1D6E 45%, var(--teal));
  --grad-dorado: linear-gradient(135deg, #FFD94D, var(--dorado), #E8A800);
  --grad-texto: linear-gradient(90deg, var(--teal), var(--dorado));

  /* Superficies y componentes (se ajustan por tema en la seccion
     "===== VARIANTES DE TEMA =====" al final de este archivo) */
  --header-fondo: rgba(15, 6, 28, 0.82);
  --menu-fondo: rgba(15, 6, 28, 0.97);
  --lang-fondo: rgba(36, 16, 64, 0.65);
  --caja-fondo: linear-gradient(160deg, var(--oscuro-2), var(--oscuro));
  --box-fondo: linear-gradient(160deg, var(--oscuro-2), rgba(36, 16, 64, 0.4));
  --chapter-fondo: rgba(36, 16, 64, 0.55);
  --chapter-epi-fondo: rgba(45, 212, 191, 0.06);
  --placeholder: rgba(184, 169, 212, 0.55);
  --teal-texto: var(--teal);
  --dorado-texto: var(--dorado);
  --error-texto: #FF8B95;
  --glow-superior: transparent;
  --fondo-top: var(--fondo);
  --hero-title-grad: linear-gradient(120deg, var(--teal), var(--dorado), var(--teal));

  --transicion: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--fuente-texto);
  background:
    radial-gradient(ellipse 90% 70% at 50% -10%, var(--glow-superior), transparent 65%),
    linear-gradient(180deg, var(--fondo-top) 0%, var(--fondo) 100%);
  background-color: var(--fondo);
  color: var(--texto);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--teal-texto); text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--violeta-claro); color: #fff; }

.container {
  width: min(1120px, 92%);
  margin-inline: auto;
}

/* ---------- Barra de progreso de lectura ---------- */
.reading-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 4px;
  z-index: 1000;
  background: transparent;
}
.reading-progress__bar {
  height: 100%;
  width: 0%;
  background: var(--grad-dorado);
  box-shadow: 0 0 12px rgba(245, 197, 24, 0.6);
  transition: width 0.1s linear;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--header-fondo);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(139, 92, 246, 0.18);
  transition: box-shadow var(--transicion);
}
.site-header.scrolled { box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--texto);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.2px;
}
.nav__brand em {
  font-style: normal;
  background: var(--grad-texto);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav__logo { flex-shrink: 0; transition: transform var(--transicion); }
.nav__brand:hover .nav__logo { transform: rotate(15deg) scale(1.1); }

.nav__toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  z-index: 910;
}
.nav__toggle span {
  width: 26px; height: 2.5px;
  background: var(--texto);
  border-radius: 2px;
  transition: transform var(--transicion), opacity var(--transicion);
}
.nav__toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

.nav__menu {
  position: fixed;
  inset: 0;
  background: var(--menu-fondo);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  font-size: 1.25rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-12px);
  transition: opacity var(--transicion), transform var(--transicion);
}
.nav__menu.open { opacity: 1; pointer-events: auto; transform: translateY(0); }
.nav__link { color: var(--texto); position: relative; padding-block: 4px; }
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--grad-dorado);
  transition: width var(--transicion);
}
.nav__link:hover::after, .nav__link:focus-visible::after { width: 100%; }

/* Selector de idioma (ES / EN / PT-BR) + acciones del header */
.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 911;
}
.lang-switch {
  display: inline-flex;
  gap: 3px;
  background: var(--lang-fondo);
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 999px;
  padding: 3px;
}
.lang-switch__btn {
  background: none;
  border: 0;
  color: var(--texto-suave);
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.5px;
  padding: 6px 10px;
  border-radius: 999px;
  transition: background var(--transicion), color var(--transicion);
}
.lang-switch__btn:hover { color: var(--texto); }
.lang-switch__btn.active {
  background: var(--grad-dorado);
  color: var(--oscuro);
  box-shadow: 0 2px 10px rgba(245, 197, 24, 0.35);
}

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-align: center;
  transition: transform var(--transicion), box-shadow var(--transicion),
              background var(--transicion), color var(--transicion);
  will-change: transform;
}
.btn:hover { transform: translateY(-3px); }
.btn:active { transform: translateY(-1px) scale(0.98); }
.btn:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; }

.btn--gold {
  background: var(--grad-dorado);
  color: #1A0B2E;
  box-shadow: 0 8px 26px rgba(245, 197, 24, 0.35);
}
.btn--gold:hover { box-shadow: 0 14px 34px rgba(245, 197, 24, 0.5); }

.btn--teal {
  background: var(--teal);
  color: #062A24;
  box-shadow: 0 8px 26px rgba(45, 212, 191, 0.35);
}
.btn--teal:hover { box-shadow: 0 14px 34px rgba(45, 212, 191, 0.5); }

.btn--ghost {
  background: transparent;
  color: var(--texto);
  border: 2px solid rgba(139, 92, 246, 0.6);
}
.btn--ghost:hover { border-color: var(--teal); color: var(--teal); background: rgba(45, 212, 191, 0.08); }

.btn--sm { padding: 9px 20px; font-size: 0.9rem; }
.btn--lg { padding: 14px 30px; font-size: 1rem; }
.btn--xl { padding: 18px 44px; font-size: 1.15rem; }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-block: 120px 90px;
  background:
    radial-gradient(ellipse 70% 55% at 80% 10%, rgba(108, 43, 217, 0.4), transparent 60%),
    radial-gradient(ellipse 60% 45% at 12% 85%, rgba(45, 212, 191, 0.16), transparent 60%),
    var(--fondo);
}
.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.hero__gradient {
  position: absolute;
  inset: -30%;
  z-index: 0;
  background: conic-gradient(from 0deg at 50% 50%,
    transparent 0deg, rgba(108, 43, 217, 0.10) 90deg,
    transparent 180deg, rgba(45, 212, 191, 0.08) 270deg, transparent 360deg);
  animation: girar 26s linear infinite;
  pointer-events: none;
}
@keyframes girar { to { transform: rotate(360deg); } }

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 48px;
  align-items: center;
}

.hero__badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--dorado-texto);
  background: rgba(245, 197, 24, 0.1);
  border: 1px solid rgba(245, 197, 24, 0.35);
  padding: 7px 16px;
  border-radius: 999px;
  margin-bottom: 20px;
  animation: flotar 5s ease-in-out infinite;
}
@keyframes flotar {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 4.4rem);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 18px;
}
.hero__title span {
  display: block;
  background: var(--hero-title-grad);
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradiente-movil 6s linear infinite;
}
@keyframes gradiente-movil {
  0% { background-position: 0% 50%; }
  100% { background-position: 220% 50%; }
}

.hero__subtitle {
  font-size: clamp(1rem, 2.6vw, 1.2rem);
  color: var(--texto-suave);
  max-width: 34rem;
  margin-bottom: 26px;
}

/* MARCADOR 11 — aviso de idiomas disponibles en el hero */
.hero__langs {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--teal-texto);
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.4);
  padding: 8px 16px;
  border-radius: 999px;
  margin-bottom: 26px;
}

/* MARCADOR 11b — aviso de idiomas en la seccion de oferta */
.oferta__langs {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--dorado-texto);
  background: rgba(245, 197, 24, 0.1);
  border: 1px solid rgba(245, 197, 24, 0.4);
  padding: 8px 16px;
  border-radius: 999px;
  margin: 0 auto 24px;
}

.hero__price {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 26px;
}
.hero__price-old {
  color: var(--texto-suave);
  text-decoration: line-through;
  font-size: 1.15rem;
}
.hero__price-new {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--dorado-texto);
  text-shadow: 0 0 26px rgba(245, 197, 24, 0.35);
}
.hero__price-tag {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--oscuro);
  background: var(--grad-dorado);
  padding: 5px 12px;
  border-radius: 999px;
  animation: pulso-tag 2.2s ease-in-out infinite;
}
@keyframes pulso-tag {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }

.hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 0.92rem;
  color: var(--texto-suave);
  margin-bottom: 34px;
}

.hero__readers {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  background: rgba(45, 212, 191, 0.08);
  border: 1px solid rgba(45, 212, 191, 0.25);
  border-radius: var(--radio-sm);
  padding: 12px 20px;
}
.hero__readers-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--teal-texto);
  font-variant-numeric: tabular-nums;
}
.hero__readers-label { color: var(--texto-suave); font-size: 0.92rem; }

.hero__book {
  position: relative;
  justify-self: center;
  width: min(300px, 72%);
}
.hero__book-glow {
  position: absolute;
  inset: 8%;
  background: radial-gradient(circle at 50% 45%, rgba(108, 43, 217, 0.65), rgba(45, 212, 191, 0.25) 60%, transparent 75%);
  filter: blur(30px);
  z-index: -1;
  animation: respirar-glow 4s ease-in-out infinite;
}
@keyframes respirar-glow {
  0%, 100% { opacity: 0.75; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}
.hero__cover {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(245, 197, 24, 0.25);
  animation: levitar 6s ease-in-out infinite;
  transform-origin: center;
}
@keyframes levitar {
  0%, 100% { transform: translateY(0) rotate(-1.2deg); }
  50% { transform: translateY(-14px) rotate(1.2deg); }
}
.hero__cover-caption {
  text-align: center;
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--texto-suave);
}

.hero__scroll {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--teal-texto);
  opacity: 0.8;
  animation: flotar 2.4s ease-in-out infinite;
  z-index: 2;
}

/* ---------- Secciones genéricas ---------- */
.section { padding-block: 84px; position: relative; }
.section__kicker {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--dorado-texto);
  margin-bottom: 12px;
}
.section__title {
  font-size: clamp(1.7rem, 4.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}
.section__lead {
  color: var(--texto-suave);
  max-width: 44rem;
  margin-bottom: 44px;
  font-size: 1.02rem;
}

/* ---------- Beneficios ---------- */
.beneficios { background: var(--oscuro); }
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.card {
  background: var(--caja-fondo);
  border: 1px solid rgba(139, 92, 246, 0.22);
  border-radius: var(--radio);
  padding: 30px 26px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transicion), border-color var(--transicion), box-shadow var(--transicion);
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-dorado);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transicion);
}
.card:hover, .card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(45, 212, 191, 0.5);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}
.card:hover::before { transform: scaleX(1); }
.card__icon {
  width: 54px; height: 54px;
  color: var(--teal);
  margin-bottom: 18px;
  filter: drop-shadow(0 4px 14px rgba(45, 212, 191, 0.35));
  transition: transform var(--transicion);
}
.card:hover .card__icon { transform: scale(1.15) rotate(-6deg); color: var(--dorado); }
.card__title { font-size: 1.12rem; margin-bottom: 10px; }
.card__text { color: var(--texto-suave); font-size: 0.96rem; }

/* ---------- Lo que aprenderás ---------- */
.aprenderas {
  background:
    radial-gradient(ellipse 50% 40% at 90% 10%, rgba(108, 43, 217, 0.2), transparent 60%),
    var(--fondo);
}
.chapters-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: capitulo;
}
.chapter {
  background: var(--chapter-fondo);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radio-sm);
  padding: 20px 22px;
  cursor: default;
  transition: transform var(--transicion), border-color var(--transicion),
              background var(--transicion), box-shadow var(--transicion);
  position: relative;
}
.chapter:hover, .chapter:focus-visible {
  transform: translateX(8px) scale(1.01);
  border-color: var(--dorado);
  background: var(--oscuro-2);
  box-shadow: var(--sombra-violeta);
  outline: none;
}
.chapter__num {
  display: inline-block;
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--dorado-texto);
  border: 1.5px solid rgba(245, 197, 24, 0.5);
  border-radius: 8px;
  padding: 3px 10px;
  margin-bottom: 10px;
  transition: background var(--transicion), color var(--transicion);
}
.chapter:hover .chapter__num { background: var(--dorado); color: var(--oscuro); }
.chapter__title { font-size: 1.05rem; margin-bottom: 6px; }
.chapter__text { color: var(--texto-suave); font-size: 0.9rem; }
.chapter--epilogue {
  border-style: dashed;
  border-color: rgba(45, 212, 191, 0.55);
  background: var(--chapter-epi-fondo);
}

/* ---------- Videos ---------- */
.videos { background: var(--oscuro); }
.videos-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.video-card {
  background: var(--oscuro-2);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: var(--radio);
  overflow: hidden;
  transition: transform var(--transicion), box-shadow var(--transicion), border-color var(--transicion);
}
.video-card:hover, .video-card:focus-within {
  transform: translateY(-6px);
  border-color: var(--teal);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
}
.video-card--featured { border-color: rgba(245, 197, 24, 0.45); }
.video-card__player {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--fondo);
}
.video-card__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background:
    radial-gradient(circle at 50% 40%, rgba(108, 43, 217, 0.45), transparent 70%),
    linear-gradient(160deg, var(--oscuro-3), var(--fondo));
  cursor: pointer;
  transition: background var(--transicion);
}
.video-card:hover .video-card__placeholder {
  background:
    radial-gradient(circle at 50% 40%, rgba(45, 212, 191, 0.4), transparent 70%),
    linear-gradient(160deg, var(--oscuro-3), var(--fondo));
}
.video-card__placeholder svg {
  transition: transform var(--transicion);
  filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.5));
}
.video-card:hover .video-card__placeholder svg { transform: scale(1.2); }
.video-card__tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--teal-texto);
  background: rgba(45, 212, 191, 0.12);
  border: 1px solid rgba(45, 212, 191, 0.35);
  padding: 4px 12px;
  border-radius: 999px;
}
.video-card--featured .video-card__tag { color: var(--dorado); border-color: rgba(245, 197, 24, 0.45); background: rgba(245, 197, 24, 0.1); }
.video-card__title { font-size: 1.02rem; padding: 18px 20px 6px; line-height: 1.4; }
.video-card__desc { color: var(--texto-suave); font-size: 0.88rem; line-height: 1.5; padding: 0 20px 12px; }
.video-card__meta { color: var(--texto-suave); font-size: 0.85rem; padding: 0 20px 20px; }

/* ---------- Testimonios ---------- */
.testimonios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.testimonio {
  background: var(--caja-fondo);
  border: 1px solid rgba(139, 92, 246, 0.22);
  border-radius: var(--radio);
  padding: 30px 26px;
  position: relative;
  transition: transform var(--transicion), box-shadow var(--transicion);
}
.testimonio::after {
  content: "”";
  position: absolute;
  top: 6px; right: 22px;
  font-size: 5rem;
  font-weight: 800;
  color: rgba(108, 43, 217, 0.35);
  line-height: 1;
}
.testimonio:hover { transform: translateY(-6px); box-shadow: var(--sombra); }
.testimonio__stars { color: var(--dorado-texto); letter-spacing: 3px; margin-bottom: 14px; font-size: 1.05rem; }
.testimonio__text { font-style: italic; color: var(--texto); margin-bottom: 20px; font-size: 0.98rem; }
.testimonio__autor { display: flex; align-items: center; gap: 12px; }
.testimonio__avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--grad-1);
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  font-size: 0.95rem;
  box-shadow: 0 4px 14px rgba(108, 43, 217, 0.5);
}
.testimonio__autor strong { display: block; font-size: 0.95rem; }
.testimonio__rol { color: var(--texto-suave); font-size: 0.82rem; }

/* Etiqueta de procedencia de los testimonios (edición anterior / beta) */
.testimonios__label-wrap { text-align: center; margin-bottom: 30px; }
.testimonios__label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--teal-texto);
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.35);
  border-radius: 999px;
  padding: 6px 16px;
}

/* ---------- Oferta / Countdown ---------- */
.oferta {
  background:
    radial-gradient(ellipse 65% 60% at 50% 0%, rgba(108, 43, 217, 0.35), transparent 65%),
    var(--fondo);
}
.oferta__box {
  text-align: center;
  background: var(--box-fondo);
  border: 1px solid rgba(245, 197, 24, 0.3);
  border-radius: 24px;
  padding: 48px 22px;
  box-shadow: var(--sombra);
}
.oferta__box .section__lead { margin-inline: auto; }

.oferta__countdown {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px; /* en movil se achica el gap para que no desborde la pantalla */
  margin-bottom: 34px;
  font-variant-numeric: tabular-nums;
}
.countdown__item {
  background: var(--oscuro);
  border: 1px solid rgba(139, 92, 246, 0.35);
  border-radius: var(--radio-sm);
  padding: 14px 10px;
  min-width: 70px; /* en movil cabe 4 items sin desbordar (antes 78px: se salia 12px) */
  animation: respirar-glow 3s ease-in-out infinite;
}
.countdown__num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--dorado-texto);
  line-height: 1;
}
.countdown__label {
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--texto-suave);
}
.countdown__sep { font-size: 1.8rem; font-weight: 800; color: var(--teal); }

.oferta__price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 24px;
}
.oferta__price-old { color: var(--texto-suave); text-decoration: line-through; font-size: 1.3rem; }
.oferta__price-new { font-size: 3.2rem; font-weight: 800; color: var(--dorado-texto); text-shadow: 0 0 30px rgba(245, 197, 24, 0.4); }
.oferta__price-tag {
  background: rgba(45, 212, 191, 0.15);
  color: var(--teal-texto);
  border: 1px solid rgba(45, 212, 191, 0.4);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 999px;
}

.oferta__incluye {
  max-width: 30rem;
  margin: 0 auto 30px;
  text-align: left;
  display: grid;
  gap: 10px;
  color: var(--texto-suave);
  font-size: 0.98rem;
}
.oferta__cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-bottom: 18px;
}
.oferta__btn { margin-bottom: 0; }
/* MARCADOR 9c — contenedor del boton de pago PayPal:
   el iframe de PayPal se adapta al ancho que le des aqui. */
.oferta__paypal {
  flex: 1 1 300px;
  max-width: 360px;
  min-height: 55px;
  /* bloque normal: el SDK de PayPal dibuja aqui sus propios
     elementos (boton + selector de cantidad); un contenedor
     flex los aplasta (problema visto en produccion) */
  display: block;
}
.oferta__paypal iframe { width: 100% !important; }
/* MARCADOR 9d — OCULTAR SOLO EL SELECTOR DE CANTIDAD DE PAYPAL:
   Se mantienen los botones de pago y el boton de comprar.
   OJO: no ocultar el bloque entero [paypal-form-fields-container]
   porque dentro viven los botones de pago.
   Si algun dia quieres que vuelva el selector, borra esta regla. */
[id^="paypal-container-"] .selectContainer,
[id^="paypal-container-"] label.input-label { display: none !important; }
/* MARCADOR 9e — COMPACTAR EL FORMULARIO DE PAYPAL (hosted button):
   El SDK de PayPal inyecta su propio CSS con margenes enormes
   (16px/32px) y gaps de 24px: en el celular el bloque de pago se
   veia como una caja blanca gigante y desproporcionada (343px de
   alto) con el precio 'distorsionado'. Estas reglas lo compactan.
   OJO: el gap usa el id del formulario (mismo hostedButtonId del
   MARCADOR 9b); si cambias de boton en PayPal, actualiza tambien
   este selector. */
[id^="paypal-container-"] [id$="-wrapper"] {
  margin-top: 4px !important;
  margin-bottom: 8px !important;
}
[id^="paypal-container-"] #paypal-form-fields-container-L5WUKHNAB54FC {
  gap: 8px !important;
}
[id^="paypal-container-"] .item-header { margin-bottom: 6px !important; }
[id^="paypal-container-"] .item-description { display: none !important; }
[id^="paypal-container-"] .item-title { font-size: 0.95rem; line-height: 1.3; }
[id^="paypal-container-"] #price-label { column-gap: 0.35rem; }
.oferta__nota { font-size: 0.85rem; color: var(--texto-suave); }

/* ---------- FAQ ---------- */
.faq { background: var(--oscuro); }
.faq__container { max-width: 780px; }
.faq__list { display: grid; gap: 14px; }
.faq__item {
  background: var(--oscuro-2);
  border: 1px solid rgba(139, 92, 246, 0.22);
  border-radius: var(--radio-sm);
  overflow: hidden;
  transition: border-color var(--transicion);
}
.faq__item[open] { border-color: rgba(45, 212, 191, 0.5); }
.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
  transition: color var(--transicion);
}
.faq__question::-webkit-details-marker { display: none; }
.faq__question:hover { color: var(--teal-texto); }
.faq__icon {
  position: relative;
  flex-shrink: 0;
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid var(--teal-texto);
  transition: transform var(--transicion), background var(--transicion);
}
.faq__icon::before, .faq__icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: var(--teal-texto);
  transition: background var(--transicion);
}
.faq__icon::before { width: 10px; height: 2px; }
.faq__icon::after { width: 2px; height: 10px; }
.faq__item[open] .faq__icon { transform: rotate(45deg); background: var(--teal); }
.faq__item[open] .faq__icon::before, .faq__item[open] .faq__icon::after { background: var(--oscuro); }
.faq__answer { padding: 0 22px 20px; color: var(--texto-suave); font-size: 0.95rem; }

/* ---------- Formulario de leads ---------- */
.lead {
  background:
    radial-gradient(ellipse 60% 55% at 15% 100%, rgba(45, 212, 191, 0.14), transparent 60%),
    var(--fondo);
}
.lead__box { max-width: 720px; text-align: center; }
.lead__box .section__lead { margin-inline: auto; }
.lead__form {
  background: var(--caja-fondo);
  border: 1px solid rgba(45, 212, 191, 0.3);
  border-radius: var(--radio);
  padding: 34px 24px;
  text-align: left;
}
.lead__fields { display: grid; gap: 18px; margin-bottom: 22px; }
.lead__field { display: grid; gap: 6px; }
.lead__label { font-weight: 700; font-size: 0.9rem; color: var(--texto); }
.lead__field input {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radio-sm);
  border: 2px solid rgba(139, 92, 246, 0.4);
  background: var(--fondo);
  color: var(--texto);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transicion), box-shadow var(--transicion);
}
.lead__field input::placeholder { color: var(--placeholder); }
.lead__field input:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(45, 212, 191, 0.15);
}
.lead__field input.invalid { border-color: #FF5D6C; box-shadow: 0 0 0 4px rgba(255, 93, 108, 0.15); }
.lead__error { color: var(--error-texto); font-size: 0.82rem; min-height: 1.1em; }
.lead__submit { width: 100%; }
.lead__privacidad { margin-top: 16px; font-size: 0.82rem; color: var(--texto-suave); text-align: center; }

.lead__success {
  background: var(--caja-fondo);
  border: 1px solid rgba(45, 212, 191, 0.45);
  border-radius: var(--radio);
  padding: 40px 24px;
  animation: aparecer 0.6s cubic-bezier(0.4, 0, 0.2, 1) both;
}
.lead__success svg { margin: 0 auto 16px; animation: pulso-tag 2.4s ease-in-out infinite; }
.lead__success h3 { font-size: 1.3rem; margin-bottom: 10px; }
.lead__success p { color: var(--texto-suave); margin-bottom: 20px; }
@keyframes aparecer {
  from { opacity: 0; transform: translateY(18px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--oscuro);
  border-top: 1px solid rgba(139, 92, 246, 0.2);
  padding-block: 48px 34px;
}
.site-footer__inner {
  display: grid;
  gap: 26px;
  text-align: center;
}
.site-footer__brand svg { margin: 0 auto 10px; }
.site-footer__name { font-weight: 800; font-size: 1.1rem; }
.site-footer__author { color: var(--texto-suave); font-size: 0.88rem; }
.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  font-size: 0.92rem;
}
.site-footer__nav a { color: var(--texto-suave); transition: color var(--transicion); }
.site-footer__nav a:hover { color: var(--teal-texto); }
.site-footer__legal {
  color: var(--texto-suave);
  font-size: 0.8rem;
  line-height: 1.7;
  max-width: 60rem;
  margin-inline: auto;
  opacity: 0.85;
}
.site-footer__legal a { color: var(--teal-texto); }

/* ---------- Scroll reveal (IntersectionObserver) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  transition-delay: var(--retraso, 0ms);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Accesibilidad: reduce motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Tablet ---------- */
@media (min-width: 640px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .chapters-grid { grid-template-columns: repeat(2, 1fr); }
  .videos-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonios-grid { grid-template-columns: repeat(2, 1fr); }
  .lead__fields { grid-template-columns: 1fr 1fr; }
  .lead__submit { width: auto; margin-inline: auto; display: flex; }
}

/* ---------- Desktop ---------- */
@media (min-width: 960px) {
  .nav__toggle { display: none; }
  .nav__menu {
    position: static;
    inset: auto;
    background: none;
    backdrop-filter: none;
    flex-direction: row;
    gap: 26px;
    font-size: 0.95rem;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    margin-left: auto;
  }
  .hero__inner { grid-template-columns: 1.15fr 0.85fr; }
  .hero__book { width: 100%; max-width: 380px; }
  .cards-grid { grid-template-columns: repeat(3, 1fr); }
  .chapters-grid { grid-template-columns: repeat(3, 1fr); }
  .videos-grid { grid-template-columns: repeat(3, 1fr); }
  .testimonios-grid { grid-template-columns: repeat(3, 1fr); }
  .site-footer__inner { grid-template-columns: 1fr auto; text-align: left; }
  .site-footer__brand svg { margin: 0 0 10px; }
  .site-footer__legal { grid-column: 1 / -1; text-align: center; }
  /* el contador recupera su tamano amplio en pantallas grandes */
  .oferta__countdown { gap: 12px; }
  .countdown__item { min-width: 78px; }
}

/* ============================================================
   ===== VARIANTES DE TEMA =====
   El tema por defecto es 'noche' (Noche Neuronal): sus valores
   viven en :root (arriba) y NO se tocan aqui. Las variantes solo
   sobrescriben variables CSS. Para cambiar el tema por defecto,
   edita const THEME_DEFAULT en script.js (MARCADOR 8). El
   selector flotante guarda la eleccion en localStorage (ecs_tema).
   ============================================================ */

/* ----- Variante 2: Violeta Profundo (oscuro, violeta mas rico) ----- */
html[data-theme="violeta"] {
  --fondo: #1A0B2E;
  --fondo-top: #2D1350;
  --glow-superior: rgba(108, 43, 217, 0.45);
  --oscuro: #23103F;
  --oscuro-2: #2C1650;
  --oscuro-3: #3A1D66;
  --violeta-claro: #9D71F5;
  --sombra-violeta: 0 12px 40px rgba(108, 43, 217, 0.55);
  --header-fondo: rgba(26, 11, 46, 0.85);
  --menu-fondo: rgba(20, 8, 38, 0.97);
  --lang-fondo: rgba(60, 29, 102, 0.6);
  --box-fondo: linear-gradient(160deg, var(--oscuro-2), rgba(45, 19, 80, 0.55));
  --chapter-fondo: rgba(58, 29, 102, 0.5);
  --chapter-epi-fondo: rgba(45, 212, 191, 0.08);
}

/* ----- Variante 3: Luz Clara (lavanda/blanco, texto oscuro) ----- */
html[data-theme="luz"] {
  --fondo: #F4F0FA;
  --fondo-top: #FFFFFF;
  --glow-superior: rgba(108, 43, 217, 0.10);
  --oscuro: #FFFFFF;
  --oscuro-2: #FFFFFF;
  --oscuro-3: #EDE6F7;
  --texto: #241338;
  --texto-suave: #5C4D7A;
  --header-fondo: rgba(255, 255, 255, 0.86);
  --menu-fondo: rgba(255, 255, 255, 0.98);
  --lang-fondo: rgba(255, 255, 255, 0.9);
  --placeholder: rgba(92, 77, 122, 0.55);
  --teal-texto: #0D9488;
  --dorado-texto: #B8860B;
  --error-texto: #C93A4B;
  --sombra: 0 10px 40px rgba(60, 30, 100, 0.16);
  --sombra-violeta: 0 10px 34px rgba(108, 43, 217, 0.2);
  --box-fondo: linear-gradient(160deg, #FFFFFF, #F0EAF8);
  --chapter-fondo: rgba(255, 255, 255, 0.8);
  --chapter-epi-fondo: rgba(13, 148, 136, 0.08);
  --hero-title-grad: linear-gradient(120deg, #4C1D95, #0F766E, #4C1D95);
}
/* Ajustes puntuales del tema claro para mantener el contraste */
html[data-theme="luz"] .hero__badge {
  background: rgba(245, 197, 24, 0.22);
  border-color: rgba(184, 134, 11, 0.4);
}
html[data-theme="luz"] .hero__langs {
  background: rgba(45, 212, 191, 0.18);
  border-color: rgba(13, 148, 136, 0.45);
}
html[data-theme="luz"] .oferta__langs {
  background: rgba(245, 197, 24, 0.22);
  border-color: rgba(184, 134, 11, 0.4);
}
html[data-theme="luz"] .site-header { border-bottom-color: rgba(108, 43, 217, 0.15); }
html[data-theme="luz"] .hero__cover {
  box-shadow: 0 30px 70px rgba(60, 30, 100, 0.35), 0 0 0 1px rgba(184, 134, 11, 0.3);
}

/* ---------- Boton WhatsApp (CTA secundario de la oferta) ---------- */
.btn--wa {
  background: #25D366;
  color: #FFFFFF;
  box-shadow: 0 8px 26px rgba(37, 211, 102, 0.4);
}
.btn--wa:hover { background: #1EBE5A; box-shadow: 0 14px 34px rgba(37, 211, 102, 0.55); color: #FFFFFF; }
.btn--wa svg { flex-shrink: 0; }

/* ---------- Boton flotante de WhatsApp (siempre visible) ---------- */
.wa-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 950;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #25D366;
  display: grid;
  place-items: center;
  box-shadow: 0 10px 30px rgba(37, 211, 102, 0.45);
  transition: transform var(--transicion), box-shadow var(--transicion);
}
.wa-float:hover, .wa-float:focus-visible {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 36px rgba(37, 211, 102, 0.55);
  outline: none;
}
.wa-float svg { width: 30px; height: 30px; color: #FFFFFF; }

/* ---------- Selector de tema (abajo a la izquierda) ---------- */
.theme-switch {
  position: fixed;
  left: 22px;
  bottom: 22px;
  z-index: 950;
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--lang-fondo);
  border: 1px solid rgba(139, 92, 246, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.theme-switch__dot {
  position: relative;
  width: 18px;
  height: 18px;
  padding: 0;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: transform var(--transicion), border-color var(--transicion), box-shadow var(--transicion);
}
.theme-switch__dot:hover { transform: scale(1.25); }
.theme-switch__dot[data-tema="noche"] { background: #1A0B2E; }
.theme-switch__dot[data-tema="violeta"] { background: linear-gradient(135deg, #2D1350, #1A0B2E); }
.theme-switch__dot[data-tema="luz"] { background: #F4F0FA; border-color: rgba(36, 19, 56, 0.45); }
.theme-switch__dot.active {
  border-color: var(--dorado);
  box-shadow: 0 0 0 3px rgba(245, 197, 24, 0.35);
}
.theme-switch__dot::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 135%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: rgba(10, 5, 20, 0.92);
  color: #EDE7F7;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
  padding: 4px 10px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transicion), transform var(--transicion);
}
.theme-switch__dot:hover::after { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Conoce al autor ---------- */
.autor {
  background:
    radial-gradient(ellipse 45% 60% at 15% 20%, rgba(108, 43, 217, 0.16), transparent 60%),
    radial-gradient(ellipse 45% 60% at 90% 80%, rgba(45, 212, 191, 0.10), transparent 60%),
    var(--fondo);
  text-align: center;
}
.autor__inner {
  display: grid;
  gap: 30px;
  justify-items: center;
  max-width: 760px;
}
.autor__avatar-wrap { position: relative; margin-bottom: 6px; }
.autor__avatar {
  width: min(230px, 56vw);
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--dorado);
  box-shadow: 0 0 0 6px rgba(108, 43, 217, 0.5), 0 24px 60px rgba(0, 0, 0, 0.45);
}
.autor__avatar-ring {
  position: absolute;
  inset: -18px;
  border: 2px dashed rgba(45, 212, 191, 0.5);
  border-radius: 50%;
  animation: girar 24s linear infinite;
}
.autor__title { margin-bottom: 6px; }
.autor__rol {
  color: var(--teal-texto);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.6px;
  margin-bottom: 16px;
}
.autor__bio {
  color: var(--texto-suave);
  font-size: 1.02rem;
  max-width: 44rem;
  margin-inline: auto;
}

/* ---------- Aviso legal (footer) ---------- */
.site-footer__aviso {
  grid-column: 1 / -1;
  margin-top: 4px;
  padding: 18px 22px;
  border: 1px dashed rgba(139, 92, 246, 0.35);
  border-radius: var(--radio-sm);
  background: var(--chapter-fondo);
  font-size: 0.78rem;
  color: var(--texto-suave);
  line-height: 1.7;
  text-align: left;
}