:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:#17263a;background:#f5f7fa;font-family:system-ui,sans-serif}body{margin:0}main{max-width:760px;margin:4rem auto;padding:0 1.5rem}h1{font-size:clamp(2rem,5vw,3rem)}section{background:#fff;border-radius:1rem;margin-top:2rem;padding:1.5rem}p{line-height:1.6}