body {
  font-family: sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 20px;
}

h2 {
  margin-bottom: 10px;
  text-align: center;
}

.flip-container {
  perspective: 1000px;
  width: 400px;
  margin: 20px auto;
}

.flipper {
  position: relative;
  width: 100%;
  height: 250px;
  transition: 0.6s;
  transform-style: preserve-3d;
}

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

.front, .back {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  box-sizing: border-box;
  font-size: 1.2em;
  text-align: center;
}

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

.btn {
  padding: 10px 20px;
  background-color: #007BFF;
  color: white;
  font-weight: bold;
  border: none;
  border-radius: 6px;
  margin: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #0056b3;
}

.btn-secondary {
  background-color: #28A745;
  transition: background-color 0.3s ease;
}

.btn-secondary:hover {
  background-color: #218838;
}

select {
  padding: 8px;
  font-size: 1em;
  border-radius: 6px;
  border: 1px solid #ccc;
  margin-bottom: 20px;
}
.all-card {
  background: #fff;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  font-size: 1em;
  line-height: 1.5;
}
.all-card strong {
  color: #007BFF;
}