:root{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color:#1f2937;background-color:#f7f7f8}*{box-sizing:border-box}body{margin:0}.app{max-width:960px;margin:0 auto;padding:2rem 1rem}