body {
  font-family: Georgia, serif;
  line-height: 1.75;
  background-color: #f9f9f9;
  color: #222;
  margin: 0;
  padding: 0;
}
header, footer {
  background: #1a1a1a;
  color: #fff;
  text-align: center;
  padding: 1.5em 1em;
}
nav {
  background: #e2e2e2;
  padding: 1em;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
nav a {
  margin: 0 1em;
  text-decoration: none;
  color: #003366;
  font-weight: bold;
  transition: color 0.3s ease;
}
nav a:hover {
  color: #007acc;
}
.container {
  max-width: 960px;
  margin: auto;
  padding: 2em;
  background: white;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}
h1, h2, h3 {
  color: #003366;
}
ul, ol {
  padding-left: 1.5em;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1em auto;
  border: 1px solid #ccc;
  box-shadow: 2px 2px 6px rgba(0,0,0,0.1);
}
footer {
  font-size: 0.9em;
}