body {
  margin: 0;
  padding: 0;
  background: #0d0d0d url('/background.png') no-repeat center center fixed;
  background-size: cover;
  color: #e0e0e0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
nav {
  background-color: #1a1a1a;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 0 10px #00e5ff;
}
nav a {
  color: #00e5ff;
  text-decoration: none;
  margin: 0 1rem;
  transition: 0.3s;
}
nav a:hover {
  color: #ffea00;
}
nav a.active {
  color: #ffea00;
  border-bottom: 2px solid #ffea00;
}
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1rem;
  background: rgba(26, 26, 26, 0.9);
  border: 2px solid #00e5ff;
  border-radius: 12px;
  box-shadow: 0 0 15px #00e5ff;
}
h1, h2 {
  color: #b388ff;
}
.card {
  background: #1e1e1e;
  padding: 1rem;
  margin-top: 1rem;
  border-left: 4px solid #00e5ff;
}
ul {
  padding-left: 1.5rem;
}


@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
  }
  nav a {
    display: block;
    margin: 0.25rem 0;
  }
  main {
    margin: 1rem;
    padding: 1rem;
    width: auto;
  }
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
  h1, h2 {
    font-size: 1.5rem;
  }
}