body {
  font-family: sans-serif;
  background: #f0f0f0;
  margin: 0;
  padding: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.card-container {
  width: 100%;
  max-width: 428px;
  perspective: 1000px;
}

.card {
  width: 100%;
  height: 380px;
  position: relative;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  padding: 24px;
  box-sizing: border-box;
  backface-visibility: hidden;
  text-align: center;
}

.card-front {
  z-index: 2;
}

.card-back {
  transform: rotateY(180deg);
}

.profile-img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 16px;
}

.title {
  color: gray;
  font-size: 1rem;
  margin: 8px 0;
}

button {
  margin-top: 20px;
  padding: 10px 16px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

.qrcode {
  width: 140px;
  height: 140px;
  margin-top: 16px;
}