body {
  font-family: Arial, sans-serif;
  background: #f7f7f7;
  margin: 0;
  padding: 0;
  display: flex;
  height: 100vh;
}

/* Left navigation sidebar */
nav {
  background: #003d6f;
  color: white;
  width: 200px;
  padding: 20px;
  box-sizing: border-box;
}
nav h2 {
  font-size: 1.2em;
  margin-top: 0;
}
nav ul {
  list-style: none;
  padding: 0;
}
nav li {
  margin: 10px 0;
}
nav a {
  color: white;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}

/* Main content area with top and bottom sections */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.top-section {
  flex: 1;
  padding: 20px;
  border-bottom: 2px solid #ccc;
}
.bottom-section {
  flex: 1;
  padding: 20px;
}
header h1 {
  margin: 0;
  color: #333;
}
footer {
  text-align: center;
  padding: 10px;
  font-size: 0.8em;
  color: #999;
  border-top: 1px solid #ccc;
}