body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: #333; max-width: 800px; margin: 0 auto; padding: 40px 20px; }
header { border-bottom: 1px solid #eee; padding-bottom: 20px; margin-bottom: 40px; }
nav a { margin-right: 15px; text-decoration: none; color: #2ecc71; font-weight: bold; }
h1 { color: #2c3e50; }
.section { margin-bottom: 40px; }
footer { margin-top: 50px; font-size: 0.8em; color: #7f8c8d; text-align: center; }