@media (max-width: 900px) {
  .roles__grid, .interests__grid { grid-template-columns: repeat(2, 1fr); }
  .about__grid { grid-template-columns: 1fr; gap: var(--space-lg); }
}

@media (max-width: 640px) {
  .section { padding: var(--space-2xl) var(--space-sm); }
  .roles__grid, .interests__grid, .cert-list { grid-template-columns: 1fr; }
  .about__stats { grid-template-columns: 1fr 1fr; }
  .hero__buttons { flex-direction: column; align-items: center; }

  .nav__hamburger { display: flex; }
  .nav__links {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    background: rgba(253, 248, 245, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm) 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--duration-normal) var(--ease-out-expo), opacity var(--duration-normal) var(--ease-out-expo);
  }
  .nav__toggle:checked ~ .nav__links { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav__link { display: block; padding: var(--space-sm) var(--space-md); width: 100%; text-align: center; }
  .nav__link--active::after { display: none; }
}

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