body {
  margin: 0;
  font-family: 'Roboto Mono', sans-serif;
  background: linear-gradient(to bottom, #003366, #660099, #FF6600);
  color: white;
  overflow-x: hidden;
}
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: linear-gradient(to right, #330066, #6600CC);
  padding: 15px 0;
  z-index: 1000;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}
header h1 {
  text-align: center;
  font-size: 1.8em;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  padding: 80px 20px 20px;
}
.module {
  background: linear-gradient(to bottom, #330066, #6600CC);
  border-radius: 15px;
  padding: 20px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}
.module:hover {
  transform: translateY(-10px);
}
.module img {
  max-width: 100%;
  border-radius: 10px;
  margin-bottom: 15px;
}
h2 {
  font-size: 1.6em;
  margin-bottom: 15px;
  color: #FF6600;
}
p {
  line-height: 1.6;
  font-size: 1em;
  margin-bottom: 15px;
}
code {
  background: rgba(0, 0, 0, 0.5);
  padding: 10px;
  border-radius: 5px;
  display: block;
  overflow-x: auto;
  font-size: 0.9em;
  margin: 10px 0;
}
pre {
  background: none;
  border: none;
  padding: 0;
}
@media (max-width: 768px) {
  header h1 {
    font-size: 1.4em;
  }
  .module {
    padding: 15px;
  }
  code {
    font-size: 0.8em;
  }
}
@media (max-width: 480px) {
  .container {
    grid-template-columns: 1fr;
  }
  header h1 {
    font-size: 1.2em;
  }
}
.parallax {
  background-image: url('https://images.gptkong.com/demo/sample1.png'), 
                    url('https://images.gptkong.com/demo/sample2.png');
  height: 400px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  margin-top: 20px;
}
.tip {
  text-align: center;
  font-size: 0.9em;
  color: #FFCC00;
  margin: 20px 0;
}