body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0b1220;
  color: #eafdff;
}

header {
  padding: 15px 20px;
  background: #10182b;
  border-bottom: 1px solid #1c2a40;
}

header h1 {
  margin: 0;
  font-size: 22px;
}

nav a {
  margin-right: 15px;
  color: #c7d6ff;
  text-decoration: none;
}

main {
  max-width: 1000px;
  margin: 30px auto;
  padding: 0 20px;
}

.card {
  background: #141e35;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 10px;
  border: 1px solid #23304a;
}

.btn {
  display: inline-block;
  background: #39d27d;
  padding: 10px 15px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  color: #000;
}

.grid {
  display: grid;
  gap: 20px;
}

.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

footer {
  text-align: center;
  padding: 20px;
  opacity: 0.6;
}