body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #000;
  color: #fff;
}
header {
  background: #111;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 {
  margin: 0;
  font-size: 1.5rem;
}
header .highlight {
  color: #ff0000;
}
nav a {
  margin-left: 15px;
  color: #fff;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 2rem;
  text-align: center;
}
footer {
  background: #111;
  color: #666;
  text-align: center;
  padding: 20px;
  font-size: 0.9rem;
}
.buy-btn {
  background: #ff0000;
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
}
.buy-btn:hover {
  background: #cc0000;
}