body { font-family: system-ui, sans-serif; margin: 0; color: #222; }
header { padding: 1rem 2rem; border-bottom: 1px solid #ddd; }
header a { color: inherit; text-decoration: none; font-weight: 600; }
.container { max-width: 1100px; margin: 0 auto; padding: 2rem; }