body {font-family: system-ui, sans-serif; margin:0; padding:0; color:#222;}
header {text-align:center; background:#e9f5ec; padding:20px;}
nav a {margin:0 8px; color:#006400; text-decoration:none;}
nav a:hover {text-decoration:underline;}
main {max-width:800px; margin:40px auto; padding:0 16px;}
section {margin-bottom:40px;}
h1,h2 {color:#006400;}
footer {text-align:center; background:#f4f4f4; padding:12px; font-size:0.9em;}