body { margin: 0; font-family: system-ui, sans-serif; color: #0f172a; background: #f6f7fb; }
main { max-width: 640px; margin: 18vh auto; padding: 0 24px; }
h1 { font-size: 2.2rem; }
code { background: #e2e8f0; padding: 2px 6px; border-radius: 6px; }