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

/* Header */
header {
  background: #2c3e50;
  color: #fff;
  padding: 20px 0;
  text-align: center;
  border-bottom: 5px solid #27ae60;
}

header h1 {
  margin: 0;
  font-size: 28px;
}

/* Navigation */
nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  background: #34495e;
  flex-wrap: wrap;
}

nav ul li {
  margin: 0;
}

nav ul li a {
  display: block;
  padding: 12px 20px;
  color: #fff;
  text-decoration: none;
  transition: background 0.3s ease;
}

nav ul li a:hover {
  background: #27ae60;
}

/* Main content area */
main {
  max-width: 900px;
  margin: 20px auto;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* Section headers */
section h2 {
  color: #27ae60;
  margin-top: 20px;
}

/* Footer */
footer {
  text-align: center;
  padding: 10px;
  background: #2c3e50;
  color: #fff;
  margin-top: 20px;
  border-top: 5px solid #27ae60;
}

/* Responsive Design */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
  }
  nav ul li a {
    text-align: center;
    border-top: 1px solid #2c3e50;
  }
}