Progressive Disclosure Steps

<!-- Progressive Disclosure Steps — later steps stay locked/dimmed until earlier ones are done -->
<div class="nuda-ob2-progressive-steps">
  <div class="nuda-ob2-progressive-steps__item is-done">
    <span class="nuda-ob2-progressive-steps__num" aria-hidden="true">
      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round">
        <path d="M5 12 L10 17 L20 7" />
      </svg>
    </span>
    <span class="nuda-ob2-progressive-steps__label">Create account</span>
  </div>
  <div class="nuda-ob2-progressive-steps__item is-current">
    <span class="nuda-ob2-progressive-steps__num" aria-hidden="true">2</span>
    <div class="nuda-ob2-progressive-steps__body">
      <span class="nuda-ob2-progressive-steps__label">Name your workspace</span>
      <p>This appears in your team's URL and settings.</p>
      <button class="nuda-ob2-progressive-steps__cta" type="button">Continue</button>
    </div>
  </div>
  <div class="nuda-ob2-progressive-steps__item is-locked">
    <span class="nuda-ob2-progressive-steps__num" aria-hidden="true">
      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
        <rect x="5" y="10" width="14" height="10" rx="2" />
        <path d="M8 10 L8 7 a4 4 0 0 1 8 0 L16 10" />
      </svg>
    </span>
    <span class="nuda-ob2-progressive-steps__label">Invite your team</span>
  </div>
</div>

.nuda-ob2-progressive-steps {
  width: 100%;
  max-width: 290px;
  padding: 14px 16px;
  background: rgba(20,20,24,.96);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
}

.nuda-ob2-progressive-steps__item {
  position: relative;
  display: flex;
  gap: 10px;
  padding: 9px 0;
}

.nuda-ob2-progressive-steps__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 11px;
  top: 32px;
  bottom: -9px;
  width: 1px;
  background: rgba(255,255,255,.1);
}

.nuda-ob2-progressive-steps__num {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font: 800 11px ui-sans-serif,system-ui;
  background: rgba(255,255,255,.05);
  border: 1.5px solid rgba(255,255,255,.12);
  color: #777;
  z-index: 1;
}

.nuda-ob2-progressive-steps__num svg {
  width: 12px;
  height: 12px;
}

.nuda-ob2-progressive-steps__item.is-done .nuda-ob2-progressive-steps__num {
  background: #e4ff54;
  border-color: #e4ff54;
  color: #0a0a0a;
}

.nuda-ob2-progressive-steps__item.is-done .nuda-ob2-progressive-steps__label {
  color: #63636e;
  text-decoration: line-through;
  text-decoration-color: rgba(255,255,255,.2);
}

.nuda-ob2-progressive-steps__item.is-current .nuda-ob2-progressive-steps__num {
  border-color: #e4ff54;
  color: #e4ff54;
  animation: nuda-ob2-progressive-steps-pulse 1.6s ease-in-out infinite;
}

.nuda-ob2-progressive-steps__item.is-current .nuda-ob2-progressive-steps__label {
  color: #fafafa;
  font-weight: 700;
}

.nuda-ob2-progressive-steps__item.is-locked {
  opacity: .5;
}

.nuda-ob2-progressive-steps__label {
  font: 600 12px ui-sans-serif,system-ui;
  color: #a1a1aa;
  line-height: 22px;
}

.nuda-ob2-progressive-steps__body {
  display: flex;
  flex-direction: column;
  gap: 5px;
  animation: nuda-ob2-progressive-steps-in .35s ease both;
}

.nuda-ob2-progressive-steps__body p {
  margin: 0;
  font: 500 11px/1.4 ui-sans-serif,system-ui;
  color: #a1a1aa;
}

.nuda-ob2-progressive-steps__cta {
  align-self: flex-start;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  margin-top: 2px;
  background: #e4ff54;
  color: #0a0a0a;
  border: none;
  border-radius: 6px;
  font: 700 11px ui-sans-serif,system-ui;
  cursor: pointer;
  transition: transform .2s;
}

.nuda-ob2-progressive-steps__cta:hover {
  transform: translateX(2px);
}

.nuda-ob2-progressive-steps__cta:focus-visible {
  outline: 2px solid #e4ff54;
  outline-offset: 2px;
}

@keyframes nuda-ob2-progressive-steps-pulse {
  0%,100% {
    box-shadow: 0 0 0 0 rgba(228,255,84,0);
  }
  50% {
    box-shadow: 0 0 0 4px rgba(228,255,84,.18);
  }
}

@keyframes nuda-ob2-progressive-steps-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-ob2-progressive-steps__item.is-current .nuda-ob2-progressive-steps__num {
    animation: none;
  }
  .nuda-ob2-progressive-steps__body {
    animation: none;
  }
}