body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #0f1a2b;
  color: #f1f1f1;
  overflow-x: hidden;
}
#background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(#1e2f45, #0f1a2b);
  z-index: -2;
  overflow: hidden;
}
header {
  text-align: center;
  padding: 60px 20px 20px;
}
h1 {
  font-size: 2em;
  color: #ffcc00;
}
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  line-height: 1.6;
}
.highlight {
  color: #00e1ff;
  font-weight: bold;
}
.fixed-btn {
  position: fixed;
  bottom: 0;
  width: 100%;
  background: #ffcc00;
  color: #000;
  text-align: center;
  padding: 15px 0;
  font-size: 18px;
  font-weight: bold;
  text-decoration: none;
  box-shadow: 0 -3px 10px rgba(0,0,0,0.5);
  z-index: 10;
}
.fixed-btn:hover {
  background: #ffd900;
}
.banner-img {
  max-width: 100%;
  border-radius: 10px;
  margin: 20px 0;
}
.animated-star {
  position: absolute;
  background: rgba(255,255,255,0.3);
  border-radius: 50%;
  animation: float 10s linear infinite;
}
@keyframes float {
  from {
    transform: translateY(100vh);
  }
  to {
    transform: translateY(-10px);
  }
}