body{font-family:Arial,sans-serif;margin:0;color:#222;line-height:1.6}
header{background:#0f172a;color:#fff;padding:24px;text-align:center}
nav a{color:#fff;margin:0 12px;text-decoration:none}
.hero{padding:70px 20px;text-align:center;background:#f4f7fb}
.btn{display:inline-block;background:#0f172a;color:#fff;padding:12px 20px;text-decoration:none;border-radius:6px}
section{max-width:900px;margin:auto;padding:50px 20px}
footer{background:#0f172a;color:#fff;text-align:center;padding:20px}
.tag{opacity:.9}