body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #f9f9f9;
  color: #333;
}

header {
  background: #2c3e50;
  color: #fff;
  padding: 40px 20px;
  text-align: center;
}

nav {
  background: #34495e;
  padding: 10px 0;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  margin: 0;
  padding: 0;
}

nav li {
  margin: 0 15px;
}

nav a {
  color: #ecf0f1;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 900px;
  margin: 30px auto;
  padding: 0 20px;
}

section {
  margin-bottom: 40px;
}

h2 {
  color: #2c3e50;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
}

footer {
  background: #2c3e50;
  color: #fff;
  text-align: center;
  padding: 20px 10px;
  position: relative;
  bottom: 0;
  width: 100%;
}