body{font-family:system-ui,sans-serif;max-width:900px;margin:0 auto;padding:16px;background:#0f172a;color:#e2e8f0}
header{display:flex;justify-content:space-between;align-items:center}
input,textarea,select,button{padding:8px;margin:4px 0;border-radius:8px;border:1px solid #334155;background:#1e293b;color:#e2e8f0;width:100%;box-sizing:border-box}
button{background:#2563eb;border:none;cursor:pointer;width:auto;padding:8px 14px}
nav button{background:#334155}
pre{background:#020617;padding:12px;border-radius:8px;overflow:auto;white-space:pre-wrap}
.warn{color:#fbbf24}
.tab{margin-top:16px}