body{font-family:Segoe UI;margin:0;background:#f1f5f9}
header{background:#1e3a8a;color:#fff;padding:12px}
.sidebar{width:220px;position:fixed;top:0;bottom:0;background:#020617;color:#fff}
.sidebar a{display:block;padding:12px;color:#cbd5f5;text-decoration:none}
main{margin-left:220px;padding:16px}
.card{background:#fff;padding:16px;border-radius:8px}