body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #e0f7fa, #fce4ec);
  margin: 0;
  padding: 2rem;
  text-align: center;
  overflow-x: hidden;
}
h1 {
  margin-bottom: 2rem;
  color: #2c3e50;
  font-size: 2.2rem;
  animation: fadeInDown 0.8s ease;
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
.card-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.flip-card {
  background-color: transparent;
  width: 340px;
  height: 260px;
  perspective: 1000px;
  margin-bottom: 30px;
}
.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.8s ease-in-out;
  cursor: pointer;
  border-radius: 15px;
}
.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}
.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  padding: 20px;
  box-sizing: border-box;
  border-radius: 15px;
  background: #ffffff;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}
.flip-card-front {
  display: flex;
  justify-content: center;
  align-items: center;
  color: #333;
  font-weight: 600;
  font-size: 1.2rem;
}
.flip-card-back {
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  font-size: 0.95rem;
}
.info-toggle {
  margin-top: 10px;
  padding: 8px 14px;
  background: #007acc;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.3s ease;
}
.info-toggle:hover {
  background: #005b99;
}
.info-content {
  display: none;
  margin-top: 10px;
  text-align: left;
  font-size: 0.85rem;
  background: #f9f9f9;
  padding: 12px;
  border-radius: 6px;
  width: 100%;
  animation: fadeIn 0.4s ease;
}
.navigation {
  display: flex;
  gap: 14px;
}
.navigation button {
  padding: 10px 24px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #2c3e50;
  color: white;
  transition: background 0.3s;
}
.navigation button:hover {
  background: #1a252f;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}