body{background:#f4f7fb;color:#18212b}
.hero{background:linear-gradient(135deg,#101820,#29415a);color:#fff}
.hero h1{font-weight:800}
.scorebox{background:#090d12;border:1px solid #405062;border-radius:16px;padding:24px;text-align:center;box-shadow:0 12px 30px rgba(0,0,0,.25)}
.scorebox #score{font-size:4rem;font-weight:800;color:#58ee83;line-height:1.1}
.challenge{border:0;border-radius:15px}
.challenge.solved{border-left:6px solid #198754}
.challenge-num{font-size:1.8rem;font-weight:800;color:#6c757d}
.answer-zone{background:#f8fafc;border:1px solid #dee2e6;border-radius:10px;padding:16px}
.hint{background:#fff8df;border-left:5px solid #ffc107;padding:12px;border-radius:7px}
.flagbox{font-family:Consolas,monospace;background:#101820;color:#58ee83;padding:10px;border-radius:7px;word-break:break-all}