body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0a2540;
  color: #ffffff;
}

header {
  padding: 20px;
  background: #081f3a;
}

header h1 {
  margin: 0;
}

nav {
  margin-top: 10px;
}

nav a {
  color: #ffffff;
  margin-right: 15px;
  text-decoration: none;
}

.toc {
  background: #123b6d;
  padding: 12px;
  display: flex;
  gap: 15px;
  overflow-x: auto;
}

.toc a {
  color: #ffffff;
  text-decoration: none;
  white-space: nowrap;
}

section {
  padding: 20px;
}

.download-btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 20px;
  background: yellow;
  color: #000;
  font-weight: bold;
  text-decoration: none;
  border-radius: 5px;
}

footer {
  text-align: center;
  padding: 15px;
  background: #081f3a;
  margin-top: 30px;
}



.hero-image {
  max-width: 400px;
  width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
  border-radius: 8px;
}