body{font-family:Arial,sans-serif;margin:0;background:#0f172a;color:#fff}
header,footer{background:#111827;padding:15px}
nav a{color:#fff;margin:8px;text-decoration:none}
main{padding:20px;max-width:1000px;margin:auto}
.card{background:#1e293b;padding:15px;border-radius:10px;margin:10px 0}
@media(max-width:700px){nav a{display:block;margin:6px 0}}