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HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Modern Flip Card</title>
<style>
  /* Basic Reset */
  * {
    margin: 0; padding: 0; box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  }

body {
    background: #f0f2f5;
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
  }

/* Card Container */
  .card {
    width: 300px;
    height: 400px;
    perspective: 1500px;
    cursor: pointer;
  }

/* Card Inner for flip */
  .card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 15px;
    box-shadow: 0 15px 25px rgba(0,0,0,0.15);
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
  }

/* Flip the card when active */
  .card.flipped .card-inner {
    transform: rotateY(180deg);
  }

/* Front and Back sides */
  .card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 15px;
    backface-visibility: hidden;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 2rem;
    color: #fff;
  }

/* Front side */
  .card-front {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.5);
  }

.card-front h2 {
    font-size: 2rem;
    margin-bottom: 0.8rem;
  }

.card-front p {
    font-size: 1.1rem;
    line-height: 1.4;
    opacity: 0.85;
  }

/* Back side */
  .card-back {
    background: #1e293b;
    transform: rotateY(180deg);
    box-shadow: 0 10px 20px rgba(30, 41, 59, 0.8);
    color: #cbd5e1;
    padding-top: 3rem;
    text-align: center;
  }

.card-back h3 {
    margin-bottom: 1rem;
    font-weight: 700;
    color: #a5b4fc;
  }

.card-back p {
    font-size: 1rem;
    line-height: 1.5;
  }

/* Button */
  .btn {
    margin-top: auto;
    align-self: center;
    padding: 0.7rem 1.8rem;
    background-color: #a78bfa;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    color: #1e293b;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 8px 15px rgba(167, 139, 250, 0.4);
    transition: background-color 0.3s ease;
  }

.btn:hover {
    background-color: #7c3aed;
    color: white;
  }
</style>
</head>
<body>

<div class="card" id="card">
  <div class="card-inner">
    <div class="card-front">
      <h2>Modern Card</h2>
      <p>This is a sleek modern card with flip animation. Click the button to learn more!</p>
      <button class="btn" id="flipBtn">More Info</button>
    </div>
    <div class="card-back">
      <h3>Details</h3>
      <p>This card flips smoothly using CSS 3D transform and is interactive with JavaScript.</p>
      <button class="btn" id="flipBackBtn">Back</button>
    </div>
  </div>
</div>

flipBtn.addEventListener('click', () => {
    card.classList.add('flipped');
  });

flipBackBtn.addEventListener('click', () => {
    card.classList.remove('flipped');
  });
</script>

</body>
</html>

CSS

JS

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