body { font-family: system-ui, sans-serif; max-width: 42rem; margin: 2rem auto; padding: 0 1rem; line-height: 1.5; color: #1a1a1a; }
header { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 1px solid #ddd; padding-bottom: .5rem; }
nav a { margin-left: 1rem; }
.brand { font-weight: 700; text-decoration: none; color: inherit; }
footer { border-top: 1px solid #ddd; margin-top: 3rem; font-size: .9rem; color: #555; }