/* Ajustes de experiencia móvil: se mantienen las jerarquías, no solo se encoge el diseño. */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; min-height: 640px; }
  .hero-note { max-width: 360px; }
  .statement-grid { grid-template-columns: 1fr; gap: 36px; }
  .speaker-grid { grid-template-columns: 1fr 1fr; }
  .speaker-featured { grid-column: 1 / -1; }
  .speaker-featured .portrait { aspect-ratio: 16 / 10; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .intro-mark { width: min(72vw, 330px); }
  .hero { min-height: 100svh; padding: 18px 20px 30px; }
  .site-header { align-items: flex-start; }
  .hgc-link img { width: 78px; }
  .header-cta { padding: 10px 13px; min-height: 42px; }
  .hero-grid { min-height: 0; margin: auto 0; gap: 44px; }
  .hero-logo { width: min(100%, 440px); margin: 14px 0 24px; }
  .hero h1 { font-size: clamp(2.15rem, 10vw, 3.35rem); }
  .hero-details { align-items: stretch; gap: 22px; margin-top: 30px; }
  .hero-details p { font-size: .82rem; }
  .button { justify-content: space-between; width: 100%; min-height: 50px; padding: 14px 16px; }
  .hero-note { font-size: 1.12rem; max-width: 275px; }
  .section { padding: 78px 24px; }
  .section h2 { font-size: clamp(2.55rem, 12.5vw, 4rem); }
  .statement p { font-size: .98rem; }
  .sofi { min-height: 500px; }
  .sofi blockquote { font-size: clamp(2.4rem, 12vw, 3.8rem); margin: 44px 0; }
  .section-head { display: block; }
  .section-head h2 { margin-top: 16px; }
  .speaker-grid { grid-template-columns: 1fr; margin-top: 40px; }
  .speaker-featured { grid-column: auto; }
  .speaker-featured .portrait { aspect-ratio: 1 / .82; }
  .speaker-body { padding: 20px; }
  .speaker h3 { font-size: 2.1rem; }
  .march { min-height: 540px; }
  .march h2 { font-size: clamp(3rem, 15vw, 4.4rem); }
  .march-date { bottom: -.04em; right: -.05em; }
  .march-date strong { font-size: clamp(8rem, 37vw, 14rem); }
  .register { text-align: left; }
  .register h2, .register p:not(.eyebrow) { margin-left: 0; }
  footer { align-items: flex-start; flex-direction: column; gap: 10px; padding: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
  .intro { display: none; }
}