Momentum Scroll Indicator

<div class="nuda-momscroll">
  <div class="nuda-momscroll__list">
    <div class="nuda-momscroll__row"></div>
    <div class="nuda-momscroll__row"></div>
    <div class="nuda-momscroll__row"></div>
    <div class="nuda-momscroll__row"></div>
    <div class="nuda-momscroll__row"></div>
  </div>
  <div class="nuda-momscroll__track" aria-hidden="true">
    <div class="nuda-momscroll__thumb"></div>
  </div>
</div>

/* Momentum Scroll Indicator
   Thin scrollbar that decays into place like iOS.
   Customize: --mom-accent */

.nuda-momscroll {
  --mom-accent: #e4ff54;
  position: relative;
  width: 280px;
  height: 200px;
  padding: 14px;
  background: #0c0c10;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.nuda-momscroll__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nuda-momscroll__row {
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.06),
    rgba(255, 255, 255, 0.02)
  );
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.nuda-momscroll__track {
  position: absolute;
  top: 14px;
  right: 6px;
  width: 3px;
  height: calc(100% - 28px);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 2px;
  overflow: hidden;
}

.nuda-momscroll__thumb {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 38%;
  background: linear-gradient(180deg, var(--mom-accent), #9ec700);
  border-radius: 2px;
  animation: nuda-mom-decay 2.6s cubic-bezier(0.22, 1, 0.36, 1) infinite;
}

@keyframes nuda-mom-decay {
  0% { transform: translateY(0); }
  55% { transform: translateY(165%); }
  80%, 100% { transform: translateY(160%); }
}

@media (prefers-reduced-motion: reduce) {
  .nuda-momscroll__thumb {
    animation: none;
    transform: translateY(160%);
  }
}