/* ==========================================================================
   BELA IA — layout.css
   Estructura, contenedores, grid y disposición de cada sección.
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
}

section {
  position: relative;
  padding: 140px 0;
  scroll-margin-top: 84px;
}

.section-alt {
  background: linear-gradient(180deg, transparent, rgba(6, 12, 18, 0.55) 12%, rgba(6, 12, 18, 0.55) 88%, transparent);
}

.section-head {
  max-width: 640px;
  margin-bottom: 64px;
}

.section-head.center {
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 18px;
}

.kicker::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent);
  flex-shrink: 0;
}

.section-head h2 {
  font-size: clamp(30px, 4vw, 44px);
  margin-bottom: 18px;
}

.section-lead {
  color: var(--color-text-dim);
  font-size: 17.5px;
  max-width: 56ch;
}

.section-head.center .section-lead {
  margin: 0 auto;
}

/* — Progreso de scroll — */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  z-index: 200;
  transition: width 0.08s linear;
}

/* — Escena 3D de fondo — */
.scene-container {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.scene-container canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.scene-vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 55% at 50% 0%, transparent 0%, var(--color-bg) 78%),
    radial-gradient(ellipse 90% 60% at 50% 100%, var(--color-bg) 15%, transparent 60%);
}

main,
header,
footer {
  position: relative;
  z-index: 2;
}

/* — Navegación — */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 20px 0;
  backdrop-filter: blur(14px);
  background: rgba(0, 0, 0, 0.55);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease);
}

.nav.is-scrolled {
  border-bottom-color: var(--color-border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 14.5px;
  color: var(--color-text-dim);
  transition: color var(--dur-fast) var(--ease);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-text);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

/* — Hero — */
.hero {
  padding: 180px 0 120px;
  min-height: 92vh;
  display: flex;
  align-items: center;
}

.hero .container {
  display: grid;
  gap: 40px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px 8px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text-dim);
  margin-bottom: 28px;
  background: rgba(11, 22, 32, 0.4);
}

.hero h1 {
  font-size: clamp(38px, 5.6vw, 68px);
  max-width: 15ch;
  margin-bottom: 26px;
}

.hero h1 em {
  font-style: italic;
  color: var(--color-accent-light);
}

.hero-lead {
  font-size: 19px;
  color: var(--color-text-dim);
  max-width: 52ch;
  margin-bottom: 40px;
}

.hero-form {
  max-width: 480px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  margin-top: 72px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.stat span {
  font-size: 13px;
  color: var(--color-text-faint);
  letter-spacing: 0.01em;
}

.scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* — Grids genéricos de sección — */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.split-reverse .split-text {
  order: 2;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.casos-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
}

.casos-side {
  display: grid;
  gap: 24px;
}

.testimonios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: 1120px;
  margin: 0 auto;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

/* — CTA final — */
.cta-final {
  text-align: center;
}

.cta-final .section-head {
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 44px;
}

.cta-final-form {
  max-width: 480px;
  margin: 0 auto;
}

/* — Footer — */
.site-footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand .brand {
  margin-bottom: 14px;
}

.footer-brand p {
  color: var(--color-text-faint);
  font-size: 14px;
  max-width: 32ch;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  font-weight: 600;
  margin-bottom: 18px;
}

.footer-col ul {
  display: grid;
  gap: 12px;
}

.footer-col a {
  font-size: 14.5px;
  color: var(--color-text-dim);
  transition: color var(--dur-fast) var(--ease);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--color-text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

/* ==========================================================================
   RESPONSIVE — 900px
   ========================================================================== */
@media (max-width: 900px) {
  section {
    padding: 96px 0;
  }

  .container {
    padding: 0 22px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 10px 22px 28px;
    background: rgba(0, 0, 0, 0.97);
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 13px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-cta {
    gap: 10px;
  }

  .nav-cta .btn-ghost {
    padding: 9px 14px;
    font-size: 13px;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 140px 0 90px;
    min-height: auto;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 32px;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .split-visual {
    order: -1;
  }

  .cards-grid,
  .testimonios-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
  }

  .casos-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 40px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* ==========================================================================
   RESPONSIVE — 500px
   ========================================================================== */
@media (max-width: 500px) {
  .cards-grid,
  .testimonios-grid,
  .pricing-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h