body { font-family: Arial, sans-serif; line-height: 1.6; margin: 0; padding: 0; }
nav { background: #2c3e50; color: white; padding: 1rem; position: sticky; top: 0; }
nav ul { list-style: none; display: flex; justify-content: space-around; }
nav a { color: white; text-decoration: none; }
section { padding: 4rem 2rem; border-bottom: 1px solid #ddd; }
h1, h2 { color: #27ae60; }
.content { max-width: 800px; margin: auto; }