body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #0e1117;
  color: #eaeaea;
  line-height: 1.6;
}
header {
  background-color: #12151c;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #1f2937;
}
.nav-left {
  font-size: 1.25rem;
  font-weight: bold;
  color: #00b4d8;
}
nav a {
  color: #eaeaea;
  margin-left: 1.5rem;
  text-decoration: none;
  font-weight: 500;
}
nav a:hover {
  color: #00b4d8;
}
main {
  padding: 2rem;
  max-width: 960px;
  margin: 0 auto;
}
h1, h2 {
  color: #00b4d8;
}
footer {
  background-color: #12151c;
  padding: 1rem 2rem;
  text-align: center;
  border-top: 1px solid #1f2937;
  color: #888;
  font-size: 0.9rem;
}