body {
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(135deg, #0A1F44, #1E3C72);
  color: white;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}
header {
  text-align: center;
  padding: 50px 20px;
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
  position: relative;
}
header h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
}
header p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
}
.module {
  padding: 40px 20px;
  margin: 20px auto;
  max-width: 1200px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  position: relative;
}
.module h2 {
  color: #FF6F61;
  margin-bottom: 20px;
  font-size: 2rem;
}
.module img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}
.highlight {
  background: #FF6F61;
  color: white;
  padding: 10px;
  border-radius: 5px;
  display: inline-block;
}
code {
  background: #1E3C72;
  color: #FF6F61;
  padding: 10px;
  border-radius: 5px;
  display: block;
  overflow-x: auto;
  font-size: 0.9rem;
  margin: 10px 0;
}
.parallax {
  height: 300px;
  background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center/cover;
  position: relative;
  margin: 40px 0;
}
.parallax::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
}
@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }
  .module {
    padding: 20px;
  }
  code {
    font-size: 0.8rem;
  }
}