* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
  color: #2c3e50;
  margin-bottom: 10px;
  font-size: 2.5em;
}

h2 {
  color: #34495e;
  margin-top: 30px;
  margin-bottom: 15px;
  font-size: 1.8em;
  border-bottom: 2px solid #3498db;
  padding-bottom: 10px;
}

h3 {
  color: #34495e;
  margin-top: 25px;
  margin-bottom: 12px;
  font-size: 1.4em;
}

h4 {
  color: #555;
  margin-top: 20px;
  margin-bottom: 10px;
  font-size: 1.2em;
}

p {
  margin-bottom: 15px;
  text-align: justify;
}

ul, ol {
  margin-left: 30px;
  margin-bottom: 15px;
}

li {
  margin-bottom: 8px;
}

a {
  color: #3498db;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.nav-links {
  display: flex;
  gap: 20px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid #ddd;
}

.nav-links a {
  padding: 10px 20px;
  background-color: #3498db;
  color: white;
  border-radius: 4px;
  transition: background-color 0.3s;
}

.nav-links a:hover {
  background-color: #2980b9;
  text-decoration: none;
}

.last-updated {
  color: #7f8c8d;
  font-size: 0.9em;
  margin-bottom: 30px;
  font-style: italic;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: #3498db;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

strong {
  color: #2c3e50;
}

hr {
  border: none;
  border-top: 2px solid #ecf0f1;
  margin: 40px 0;
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }
  
  .container {
    padding: 20px;
  }
  
  h1 {
    font-size: 2em;
  }
  
  h2 {
    font-size: 1.5em;
  }
  
  .nav-links {
    flex-direction: column;
  }
}