html {
  scroll-behavior: smooth;
}

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.01em;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-up {
  animation: fade-up 0.7s ease-out both;
}

.fade-up-1 { animation-delay: 0.1s; }
.fade-up-2 { animation-delay: 0.25s; }
.fade-up-3 { animation-delay: 0.4s; }

details > summary {
  list-style: none;
}
details > summary::-webkit-details-marker {
  display: none;
}