body {
  margin: 0;
  font-family: sans-serif;
  background-color: black;
  color: white;
}
h1, h2 { margin: 0; }
.text-center { text-align: center; }
.p-10 { padding: 2.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.text-xl { font-size: 1.25rem; }
.text-5xl { font-size: 3rem; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.bg-black { background-color: black; }
.bg-gray-800 { background-color: #1f2937; }
.bg-gray-900 { background-color: #111827; }
.text-white { color: white; }
.font-sans { font-family: sans-serif; }
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.75rem;
  cursor: pointer;
}
.btn-blue { background-color: #2563eb; color: white; }
.btn-blue:hover { background-color: #1d4ed8; }
.btn-gray { background-color: #374151; color: white; }
.btn-gray:hover { background-color: #4b5563; }
.card {
  background-color: #111827;
  padding: 1.5rem;
  border-radius: 1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
}
.grid {
  display: grid;
  gap: 1.5rem;
}
.md\:grid-cols-3 {
  grid-template-columns: repeat(1, 1fr);
}
@media(min-width: 768px) {
  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}
.max-w-5xl { max-width: 64rem; }
.mx-auto { margin-left: auto; margin-right: auto; }
.border-t { border-top: 1px solid #374151; }