body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background-color: #0e0e0e;
  color: #f5f5f5;
}
header {
  background-color: #1a1a1a;
  padding: 20px;
  text-align: center;
}
nav a {
  color: #f5f5f5;
  margin: 0 15px;
  text-decoration: none;
  font-weight: 600;
}
nav a:hover { color: #ff3333; }
main {
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
}
footer {
  background-color: #1a1a1a;
  text-align: center;
  padding: 15px;
  color: #ccc;
}
.btn {
  background-color: #ff3333;
  border: none;
  color: white;
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 6px;
  text-decoration: none;
}
.btn:hover { background-color: #ff5555; }