body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0b0f19;
  color: #fff;
}

header {
  padding: 60px 20px;
  text-align: center;
  background: #111827;
}

h1 {
  font-size: 42px;
  margin: 0;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 20px;
}

h2 {
  color: #60a5fa;
  margin-top: 40px;
}

.box {
  background: #111827;
  padding: 18px;
  border-radius: 10px;
  margin-top: 10px;
}

.nav {
  text-align: center;
  padding: 15px;
  background: #0f172a;
}

.nav a {
  color: #fff;
  margin: 0 10px;
  text-decoration: none;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 18px;
  background: #22c55e;
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
}

footer {
  text-align: center;
  padding: 40px;
  color: #9ca3af;
  font-size: 12px;
}