.challenges-panel{background:var(--color-bg-primary, #111827);color:var(--color-text-primary, #f3f4f6)}.challenges-header{background:linear-gradient(90deg,#1e1b4b,#1e3a5f);border-bottom-color:#374151}.ch-filter-btn{background:transparent;border:1px solid #374151;color:#9ca3af;cursor:pointer;transition:all .15s}.ch-filter-btn:hover{border-color:#6b7280;color:#e5e7eb}.ch-filter-btn.active{background:#1d4ed8;border-color:#3b82f6;color:#fff}.ch-card{transition:box-shadow .15s,border-color .15s}.ch-card:hover{box-shadow:0 0 0 1px #3b82f6}.ch-tag{display:inline-block;padding:1px 6px;border-radius:9999px;background:#1f2937;color:#9ca3af;font-size:10px;border:1px solid #374151}.ch-problem-inner{font-size:12px}.ch-description{line-height:1.65}.ch-h3{font-size:13px;font-weight:700;color:#e5e7eb;margin:10px 0 4px}.ch-h4{font-size:12px;font-weight:600;color:#d1d5db;margin:8px 0 3px}.ch-code-block{background:#0f172a;border:1px solid #1e293b;border-radius:4px;padding:8px 10px;font-family:JetBrains Mono,Fira Code,Consolas,monospace;font-size:11px;overflow-x:auto;white-space:pre;color:#93c5fd;margin:6px 0}.ch-inline-code{background:#1e293b;padding:1px 5px;border-radius:3px;font-family:monospace;font-size:11px;color:#7dd3fc}.ch-table{width:100%;border-collapse:collapse;font-size:11px;margin:6px 0}.ch-td{padding:3px 8px;border:1px solid #374151;color:#d1d5db}.ch-td:first-child{color:#9ca3af}.ch-ul{list-style:disc;padding-left:16px;margin:4px 0}.ch-li{margin:2px 0;color:#d1d5db}.ch-submit-btn{transition:background .15s;min-width:120px}.ch-textarea{display:block;width:100%;height:100%;font-size:12px;line-height:1.5;tab-size:4;background:#0f172a;color:#e2e8f0;border:none;outline:none;resize:none;padding:12px;font-family:JetBrains Mono,Fira Code,Consolas,monospace}#ch-result-pane{background:#0f172a}