body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:#0f172a;color:#fff}
.topbar{padding:15px 25px;background:#111827;display:flex;justify-content:space-between}
.container{max-width:1200px;margin:auto;padding:20px}
.card{background:#1e293b;border-radius:16px;padding:20px}
.btn{background:#fbbf24;color:#111;padding:10px 18px;border-radius:8px;text-decoration:none}