body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: #f9f9f9;
  color: #2e2e2e;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  background: #ffffff;
  padding: 40px 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

header h1 {
  margin: 0;
  font-size: 2.5em;
  color: #1a202c;
}

header p {
  margin: 10px 0;
  font-size: 1.1em;
  color: #4a5568;
}

nav {
  background: #edf2f7;
  padding: 12px 0;
  border-top: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
}

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

nav ul li {
  margin: 0 20px;
}

nav ul li a {
  text-decoration: none;
  color: #2d3748;
  font-weight: bold;
}

nav ul li a:hover {
  color: #3182ce;
}

section {
  padding: 40px 20px;
  max-width: 1000px;
  margin: 0 auto;
  background: #ffffff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  margin-bottom: 24px;
}

section h2 {
  color: #2b6cb0;
  border-bottom: 2px solid #bee3f8;
  padding-bottom: 8px;
}

section h3 {
  color: #4a5568;
  margin-top: 20px;
}

section ul {
  padding-left: 20px;
  margin-top: 10px;
}

footer {
  background: #2d3748;
  color: #f7fafc;
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
}