body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0b0f0c;
  color: #d1f7c4;
}
header {
  background: #1a2e1b;
  padding: 1rem;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 1rem;
}
nav a {
  color: #a5e38e;
  text-decoration: none;
}
nav a:hover {
  color: #f0fff4;
}
main {
  padding: 2rem;
}
footer {
  background: #1a2e1b;
  color: #ccc;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}
.join-btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: #38b000;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  margin-top: 1rem;
}
.join-btn:hover {
  background: #56c22e;
}