/* 120fps-friendly defaults */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
img, video { content-visibility: auto; }
.card, .course, .ch-card, .how-item, .prog, .prog-card {
  contain: layout style;
  transform: translateZ(0);
}
/* avoid expensive filters on scroll where possible */
body { text-rendering: optimizeSpeed; }