body { font-family: system-ui, sans-serif; max-width: 760px; margin: 0 auto; padding: 16px; line-height: 1.55; color: #1f2933; }
header { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; border-bottom: 1px solid #e4e7eb; padding-bottom: 8px; }
nav a { margin-right: 10px; }
footer { margin-top: 40px; border-top: 1px solid #e4e7eb; font-size: 0.9em; color: #52606d; }