body{background:#0f172a;color:#e5e7eb;font-family:Arial;margin:0}
.nav{background:#111827;padding:15px}
.nav a{color:white;margin-right:15px;text-decoration:none}
.box{background:#1f2937;padding:20px;margin:20px;border-radius:6px}
input,textarea{width:100%;padding:8px;margin:5px 0;background:#111827;color:white;border:1px solid #374151}
button{padding:10px 15px;background:#2563eb;color:white;border:none;cursor:pointer}
h2{margin-top:0}