body {
  background: #0a0f0a;
  color: #e6e6e6;
  font-family: "Segoe UI", sans-serif;
  margin: 0;
}
nav.topnav {
  background: #101010;
  padding: 12px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  border-bottom: 1px solid #222;
}
nav.topnav a {
  color: #ccc;
  padding: 6px 10px;
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.2s;
}
nav.topnav a.active,
nav.topnav a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
header.hero {
  text-align: center;
  padding: 40px 20px;
  border-bottom: 1px solid #333;
}
header.hero h1 {
  color: #ccffcc;
  margin-bottom: 10px;
}
header.hero .subtitle {
  color: #a0a0a0;
  font-style: italic;
}
main {
  padding: 30px 40px;
  line-height: 1.6;
}
footer {
  text-align: center;
  padding: 15px;
  font-size: 14px;
  color: #888;
  border-top: 1px solid #222;
  margin-top: 50px;
}