body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0b0f1a;
  color: white;
}

header {
  background: #111827;
  padding: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: #9ca3af;
  margin-left: 15px;
  text-decoration: none;
}

nav a:hover {
  color: white;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 15px;
  margin-top: 20px;
}

.card {
  background: #1f2937;
  padding: 15px;
  border-radius: 10px;
}

.hidden {
  display: none;
}

#admin-login {
  max-width: 300px;
  margin: 80px auto;
  text-align: center;
}