Theme Dropdown

<!-- Theme Dropdown -->
<div class="nuda-tdd">
  <button class="nuda-tdd__trigger" type="button">
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
      <circle cx="12" cy="12" r="4" />
      <path d="M12 2 L12 4" /><path d="M12 20 L12 22" />
      <path d="M4.9 4.9 L6.3 6.3" /><path d="M17.7 17.7 L19.1 19.1" />
    </svg>
    Theme
    <svg class="nuda-tdd__chev" viewBox="0 0 12 12" fill="none"
         stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
      <path d="M3 4.5 L6 7.5 L9 4.5" />
    </svg>
  </button>
  <ul class="nuda-tdd__menu">
    <li class="nuda-tdd__item is-active"><span class="nuda-tdd__check"></span>Light</li>
    <li class="nuda-tdd__item"><span class="nuda-tdd__check"></span>Dark</li>
    <li class="nuda-tdd__item"><span class="nuda-tdd__check"></span>System</li>
  </ul>
</div>

/* Theme Dropdown
   Trigger reveals a menu on hover with three options + a glowing check.
   Customize: --tdd-accent. Replace :hover with .is-open from JS for click-trigger. */

.nuda-tdd {
  --tdd-accent: #e4ff54;
  position: relative;
  display: inline-block;
}

.nuda-tdd__trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px 8px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  color: #fafafa;
  font: 600 0.875rem ui-sans-serif, system-ui, sans-serif;
  cursor: pointer;
  transition: border-color 0.25s;
}

.nuda-tdd__trigger svg { width: 15px; height: 15px; }

.nuda-tdd__trigger:hover { border-color: rgba(228, 255, 84, 0.3); }

.nuda-tdd__chev {
  transition: transform 0.25s;
  color: #a1a1aa;
}

.nuda-tdd:hover .nuda-tdd__chev,
.nuda-tdd.is-open .nuda-tdd__chev { transform: rotate(180deg); }

.nuda-tdd__menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  list-style: none;
  padding: 6px;
  margin: 0;
  background: rgba(20, 20, 24, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  min-width: 100%;
  backdrop-filter: blur(8px);
  box-shadow: 0 8px 20px -4px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 10;
}

.nuda-tdd:hover .nuda-tdd__menu,
.nuda-tdd.is-open .nuda-tdd__menu {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.nuda-tdd__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  font: 500 0.875rem ui-sans-serif, system-ui, sans-serif;
  color: #a1a1aa;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.nuda-tdd__item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: #fafafa;
}

.nuda-tdd__check {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: transparent;
  border: 1.5px solid rgba(255, 255, 255, 0.15);
  transition: all 0.25s;
}

.nuda-tdd__item.is-active { color: #fafafa; }

.nuda-tdd__item.is-active .nuda-tdd__check {
  background: var(--tdd-accent);
  border-color: var(--tdd-accent);
  box-shadow: 0 0 6px rgba(228, 255, 84, 0.5);
}