body { font-family: Inter, Segoe UI, Arial, sans-serif; }
video.cam-preview { width: 100%; max-width: 420px; border-radius: 12px; border: 1px solid #d1d5db; background: #111827; }
.card-soft { border: 1px solid #e5e7eb; border-radius: 16px; box-shadow: 0 4px 18px rgba(0,0,0,.04); }
.small-muted { color: #6b7280; font-size: .9rem; }
.challenge-badge { background: #eff6ff; color: #1d4ed8; border:1px solid #bfdbfe; border-radius: 999px; padding: .25rem .6rem; margin-right: .25rem; display: inline-block; }
.codebox { font-family: Consolas, monospace; background: #f8fafc; border: 1px solid #e5e7eb; border-radius: 8px; padding: .5rem; }