Pure CSS Accordion

<!-- Pure CSS Accordion — native <details>, zero JS -->
<div class="nuda-css-accordion">
  <details class="nuda-css-accordion__item" open>
    <summary class="nuda-css-accordion__header">
      <span>What is NudaUI?</span>
      <span class="nuda-css-accordion__icon">+</span>
    </summary>
    <div class="nuda-css-accordion__body">A library of copy-paste CSS components.</div>
  </details>
  <details class="nuda-css-accordion__item">
    <summary class="nuda-css-accordion__header">
      <span>Does it need JavaScript?</span>
      <span class="nuda-css-accordion__icon">+</span>
    </summary>
    <div class="nuda-css-accordion__body">No — this accordion is pure CSS.</div>
  </details>
</div>

/* Pure CSS Accordion
   Native <details>/<summary>. No JS.
   Customize: --nuda-css-acc-accent */

.nuda-css-accordion {
  --nuda-css-acc-accent: #e4ff54;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 480px;
  color: #fff;
}

.nuda-css-accordion__item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 10px;
  overflow: hidden;
}

.nuda-css-accordion__item[open] {
  border-color: rgba(228, 255, 84, 0.2);
}

.nuda-css-accordion__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #ccc;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s;
}

.nuda-css-accordion__header::-webkit-details-marker { display: none; }

.nuda-css-accordion__header:hover { color: #fff; }

.nuda-css-accordion__header:focus-visible {
  outline: 2px solid var(--nuda-css-acc-accent);
  outline-offset: -2px;
}

.nuda-css-accordion__icon {
  display: inline-block;
  font-size: 1.1rem;
  color: #666;
  transition: transform 0.3s ease, color 0.2s;
}

.nuda-css-accordion__item[open] .nuda-css-accordion__icon {
  color: var(--nuda-css-acc-accent);
  transform: rotate(45deg);
}

.nuda-css-accordion__body {
  padding: 0 1rem 0.9rem;
  font-size: 0.85rem;
  color: #999;
  animation: nuda-css-acc-open 0.3s ease-out;
}

@keyframes nuda-css-acc-open {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .nuda-css-accordion__body { animation: none; }
  .nuda-css-accordion__icon { transition: none; }
}