* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #0f0f1a;
  color: white;
  overflow-x: hidden;
}

.background {
  position: fixed;
  width: 100%;
  height: 100%;
  background: linear-gradient(-45deg, #1e3c72, #2a5298, #0f2027, #203a43);
  background-size: 400% 400%;
  animation: gradient 15s ease infinite;
  z-index: -1;
}

@keyframes gradient {
  0% {background-position: 0% 50%;}
  50% {background-position: 100% 50%;}
  100% {background-position: 0% 50%;}
}

header {
  text-align: center;
  padding: 40px 0;
}

.cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  padding: 20px;
}

.card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 20px;
  width: 250px;
  transition: 0.4s;
  opacity: 0;
  transform: translateY(20px);
}

.card.show {
  opacity: 1;
  transform: translateY(0);
}

.card:hover {
  transform: scale(1.05);
  background: rgba(255, 255, 255, 0.15);
}