*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;line-height:1.5;margin:0;background:#f8fafc;color:#0f172a}
header{background:#e2e8f0;padding:1rem 1.25rem}
h1{margin:0 0 .25rem 0}
nav a{margin-right:1rem;text-decoration:none;color:#0f172a}
nav a:hover{text-decoration:underline}
main{padding:1.25rem}
section{background:#fff;border:1px solid #e5e7eb;border-radius:.75rem;padding:1rem;box-shadow:0 1px 2px rgba(0,0,0,.05)}
footer{border-top:1px solid #e5e7eb;padding:1rem 1.25rem;margin-top:1rem;background:#f1f5f9}