:root{color-scheme:dark;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}body{margin:0;background:#0f172a;color:#e2e8f0}.app{max-width:860px;margin:0 auto;padding:16px}.alert{background:#7f1d1d;border:1px solid #ef4444;border-radius:10px;padding:10px;margin-bottom:12px}.tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-bottom:16px}button,input,textarea,select{border-radius:10px;border:1px solid #334155;background:#1e293b;color:#e2e8f0;padding:10px;font-size:14px}button.active{background:#0ea5e9;color:#082f49;font-weight:600}section{border:1px solid #334155;border-radius:12px;padding:12px;margin-bottom:16px}form{display:flex;flex-direction:column;gap:8px}pre{white-space:pre-wrap}ul{margin:10px 0 0;padding-left:20px}@media (max-width: 700px){.tabs{grid-template-columns:repeat(2,minmax(0,1fr))}}