html {
  --scroll-track: #f1f5f9;
  --scroll-thumb: #64748b;
  scroll-behavior: smooth;
  scroll-padding-top: 7rem;
  scrollbar-gutter: stable;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}
html.dark {
  --scroll-track: #0f172a;
  --scroll-thumb: #94a3b8;
}
html::-webkit-scrollbar { width: 12px; height: 12px; }
html::-webkit-scrollbar-track { background: var(--scroll-track); }
html::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border: 3px solid var(--scroll-track);
  border-radius: 999px;
}
html::-webkit-scrollbar-thumb:hover { background: #2563eb; }
@media (prefers-reduced-motion: reduce) {
  html.scroll-smooth { scroll-behavior: auto; }
}
@media (forced-colors: active) {
  html { scrollbar-color: auto; }
}