/* ═══════════════════════════════════════════
   IA Semanal — papel, tinta y resaltador
   Base: papel #FFFFFF · Tinta: #1C2147
   Acento único: resaltador #E4FA5C
   ═══════════════════════════════════════════ */

:root {
  --papel: #FFFFFF;
  --tinta: #1C2147;
  --tinta-suave: #565B7C;
  --resaltador: #E4FA5C;
  --resaltador-hondo: #C7DC33;
  --linea: #E4E6F1;
  --papel-suave: #F7F8FC;

  --f-dinamica: "Archivo", system-ui, sans-serif;
  --f-leida: "Newsreader", Georgia, serif;

  --ancho: 1000px;
  --radio-caja: 16px;
  --radio-nota: 9px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--f-leida);
  font-size: 1.06rem;
  line-height: 1.66;
  background: var(--papel);
  color: var(--tinta);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--resaltador); color: var(--tinta); }

.container {
  width: 100%;
  max-width: var(--ancho);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow { max-width: 640px; }

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--tinta);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Botones: lo marcado se resalta ─────────── */

.btn {
  display: inline-block;
  font-family: var(--f-dinamica);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--tinta);
  background: var(--resaltador);
  border: 2px solid var(--tinta);
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.15s ease;
}

.btn--small { padding: 8px 20px; font-size: 0.85rem; }
.btn--big   { padding: 13px 26px; font-size: 1rem; }

.btn:hover {
  background: var(--resaltador-hondo);
  transform: translateX(2px);
}

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

/* ── Header ─────────────────────────────────── */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--linea);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 15px;
  padding-bottom: 15px;
}

.logo {
  font-family: var(--f-dinamica);
  font-weight: 800;
  font-stretch: 118%;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--tinta);
}

/* ── Hero ───────────────────────────────────── */

.hero {
  padding: 88px 0 80px;
  background:
    radial-gradient(ellipse 90% 55% at 50% -12%, rgba(228, 250, 92, 0.14), transparent),
    var(--papel);
}

.hero .container { max-width: 760px; }

.hero__title {
  font-family: var(--f-dinamica);
  font-weight: 800;
  font-stretch: 115%;
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  line-height: 1.03;
  letter-spacing: -0.025em;
  margin-bottom: 22px;
}

/* La frase que manda: grande y clara */
.hero__line {
  font-family: var(--f-dinamica);
  font-weight: 650;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  line-height: 1.28;
  letter-spacing: -0.015em;
  max-width: 34rem;
  margin-bottom: 34px;
}

/* ── Suscripción ────────────────────────────── */

.signup { max-width: 540px; }

.signup__form {
  display: flex;
  gap: 8px;
  padding: 7px;
  background: var(--papel);
  border: 2px solid var(--tinta);
  border-radius: 999px;
}

.signup__input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  font-family: var(--f-leida);
  font-size: 1rem;
  padding: 8px 10px 8px 20px;
  outline: none;
  color: var(--tinta);
}

.signup__input::placeholder { color: #9CA0C4; }

.signup__micro {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--tinta-suave);
}

/* ── Tres cajas ─────────────────────────────── */

.section { padding: 84px 0; }

.section--cajas { padding: 0 0 84px; }

.cajas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  max-width: 46rem;
  margin: 0 auto;
}

.caja {
  background: var(--papel);
  border: 1px solid var(--linea);
  border-radius: var(--radio-caja);
  padding: 28px 24px;
  text-align: center;
}

.caja__icono { font-size: 1.9rem; display: block; margin-bottom: 12px; }

.caja__titulo {
  font-family: var(--f-dinamica);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.caja__texto {
  color: var(--tinta-suave);
  font-size: 0.97rem;
}

/* ── Secciones comunes ──────────────────────── */

.section--suave { background: var(--papel-suave); }

.section__title {
  font-family: var(--f-dinamica);
  font-weight: 800;
  font-stretch: 112%;
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 40px;
}

/* ── Para quién: dos paneles desiguales ─────── */

.gente {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 50rem;
  margin: 0 auto;
}

.gente__panel {
  background: var(--papel);
  border: 1.5px solid var(--tinta);
  border-radius: var(--radio-caja);
  padding: 32px 28px;
}

.gente__panel h3 {
  font-family: var(--f-dinamica);
  font-weight: 700;
  font-size: 1.24rem;
  margin-bottom: 18px;
}

.gente__panel ul { list-style: none; }

.gente__panel li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 1rem;
}
.gente__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 12px;
  height: 9px;
  background: var(--resaltador);
  border-radius: 2px;
}

/* ── Por qué creamos IA Semanal ─────────────── */

.revolucion { text-align: center; }

.revolucion__cabeza {
  font-family: var(--f-dinamica);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.6vw, 1.65rem);
  line-height: 1.3;
  margin-bottom: 16px;
}

.revolucion p:not(.revolucion__cabeza) {
  color: var(--tinta-suave);
  max-width: 36rem;
  margin: 0 auto;
}

/* ── Únete: banda en tinta ──────────────────── */

.unete {
  background: var(--tinta);
  color: var(--papel);
  padding: 84px 0;
}

.unete__inner { max-width: 680px; }

.signup--centro { margin: 0 auto; text-align: center; }
.signup--centro .signup__form {
  background: var(--tinta);
  border-color: var(--papel);
  box-shadow: 0 0 0 7px rgba(228, 250, 92, 0.28);
}
.signup--centro .signup__input { color: var(--papel); }
.signup--centro .signup__input::placeholder { color: #8187B8; }
.signup--centro .signup__micro { color: #B9BDDC; }

/* ── FAQ chiquita: reglas de libreta ────────── */

.faq {
  border-top: 1px solid var(--linea);
  padding: 20px 0;
}

.faq:last-of-type { border-bottom: 1px solid var(--linea); }

.faq summary {
  cursor: pointer;
  font-family: var(--f-dinamica);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: -0.01em;
  list-style: none;
  position: relative;
  padding-right: 40px;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--tinta-suave);
  transition: transform 0.2s ease;
}

.faq[open] summary::after { transform: translateY(-50%) rotate(45deg); }

.faq p {
  padding-top: 10px;
  padding-right: 40px;
  color: var(--tinta-suave);
}

/* ── Footer ─────────────────────────────────── */

.footer { padding: 64px 0 56px; text-align: center; }

.footer__logo {
  font-family: var(--f-dinamica);
  font-weight: 800;
  font-stretch: 118%;
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.footer__tag {
  color: var(--tinta-suave);
  font-size: 0.95rem;
}

.footer__cta {
  display: inline-block;
  margin: 18px 0 22px;
  padding: 9px 18px;
  background: var(--papel-suave);
  border: 1px solid var(--linea);
  border-radius: var(--radio-nota);
  color: var(--tinta-suave);
  font-size: 0.9rem;
}

.footer__copy {
  color: #9CA0C4;
  font-size: 0.82rem;
}

/* ── Responsive ─────────────────────────────── */

@media (max-width: 900px) {
  .hero { padding: 64px 0 64px; }
  .cajas { grid-template-columns: 1fr; max-width: 26rem; }
}

@media (max-width: 640px) {
  .gente { grid-template-columns: 1fr; }
  .signup__form {
    flex-direction: column;
    border-radius: var(--radio-caja);
  }
  .signup__input { padding: 12px; text-align: center; }
  .btn--big { width: 100%; }
  .section, .unete { padding: 64px 0; }
  .section--cajas { padding: 0 0 64px; }
}