:root{color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,sans-serif}body{margin:0;background:#101624;color:#eaf0f7}main{max-width:650px;margin:15vh auto;padding:2rem}h1{font-size:2rem}p{color:#b9c7d9;line-height:1.7}a{color:#90c4ff}footer{margin-top:3rem}