:root{font-family:system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color:#213547;background-color:#fff}*{margin:0;padding:0;box-sizing:border-box}body{min-height:100vh}a{color:#646cff;text-decoration:none}a:hover{color:#535bf2}nav{padding:2rem;border-bottom:1px solid #e5e7eb}nav ul{list-style:none;display:flex;gap:1rem}main{padding:2rem}h1{font-size:2rem;margin-bottom:1rem}