<div class="card-13">
  <div class="card-13__inner">
    <div class="card-13__front">
      <span class="card-13__tag">Hover</span>
      <h4 class="card-13__title">Flip Card</h4>
      <p class="card-13__body">Hover to flip over.</p>
    </div>
    <div class="card-13__back">
      <h4 class="card-13__back-title">The Back</h4>
      <p class="card-13__back-body">Revealed with CSS 3D perspective.</p>
      <span class="card-13__back-cta">Explore &rarr;</span>
    </div>
  </div>
</div>

.card-13__tag {
  font-family: monospace;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(124, 108, 255, 0.15);
  color: #7c6cff;
  border: 1px solid rgba(124, 108, 255, 0.3);
  display: inline-block;
  margin-bottom: 10px;
}
.card-13__title {
  font-size: 17px;
  font-weight: 700;
  color: #f0eeff;
  margin-bottom: 6px;
}
.card-13__body {
  font-size: 13px;
  color: #b8b6d4;
  line-height: 1.6;
}
.card-13 {
  /* The face elements (__front, __back) are absolutely positioned and
     give the parent zero intrinsic width. Use a fixed 280px width so
     the card has a predictable size in any flex container (stage,
     playground iframe). Same pattern as card-26. */
  width: 280px;
  max-width: 100%;
  height: 155px;
  perspective: 800px;
  cursor: pointer;
}
.card-13__inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}
.card-13:hover .card-13__inner {
  transform: rotateY(180deg);
}
.card-13__front,
.card-13__back {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  padding: 22px;
  backface-visibility: hidden;
}
.card-13__front {
  background: #17171f;
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.card-13__back {
  background: linear-gradient(135deg, #7c6cff, #ff6c8a);
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.card-13__back-title {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}
.card-13__back-body {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.8);
}
.card-13__back-cta {
  display: inline-block;
  margin-top: 10px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}