body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f0f0f;
  color: #fff;
}

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

h1 {
  color: #9cff00;
}

.subtitle {
  color: #ccc;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 15px;
  margin-top: 20px;
}

.card {
  background: #1c1c1c;
  padding: 20px;
  border-radius: 10px;
  text-decoration: none;
  color: #fff;
  transition: 0.2s;
  word-wrap: break-word;
}

.card:hover {
  background: #9cff00;
  color: #000;
}

.lesson {
  line-height: 1.6;
}

code {
  display: block;
  background: #111;
  padding: 10px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 10px 0;
}

@media (max-width: 600px) {
  .container {
    padding: 15px;
  }
}