body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: white;
}
header {
  background-color: rgba(0, 0, 0, 0.8);
  padding: 20px;
  text-align: center;
}
header h1 {
  margin: 0;
  font-size: 2.5rem;
  letter-spacing: 1px;
}
nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  background-color: #111;
  padding: 10px 0;
}
nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
section {
  padding: 40px;
  max-width: 1000px;
  margin: auto;
}
footer {
  background-color: #111;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
  font-size: 0.9rem;
}
.highlight {
  color: #00ffff;
  font-weight: bold;
}