.kidney-tool{max-width:840px;margin:18px auto;font-family:system-ui,Segoe UI,Roboto,Arial;background:#fff;border:1px solid #ddd;padding:18px;border-radius:8px}
.kidney-tool h2{margin-top:0}
.kidney-tool .row{display:flex;gap:12px;flex-wrap:wrap}
.kidney-tool .col{flex:1 1 200px;min-width:160px}
.kidney-tool label{display:block;font-size:13px;margin-bottom:6px;color:#333}
.kidney-tool input,.kidney-tool select,.kidney-tool textarea{width:100%;padding:8px;border:1px solid #ccc;border-radius:6px;font-size:14px}
.kidney-tool .btn{padding:8px 12px;border-radius:6px;border:none;background:#0b79d0;color:#fff;cursor:pointer;margin-right:6px}
.kidney-tool .btn.muted{background:#666}
.kidney-tool .btn.small{padding:6px 8px;font-size:13px}
.kidney-tool .result{margin-top:16px;padding:14px;border-radius:8px;background:#f8f9fb;border:1px solid #eef2f6}
.kidney-tool .warn{color:#a94442;background:#f2dede;padding:10px;border-radius:6px;margin-top:12px}
.kidney-tool .good{color:#155724;background:#d4edda;padding:10px;border-radius:6px;margin-top:12px}
.kidney-tool .badge{display:inline-block;padding:6px 10px;border-radius:6px;font-weight:600;background:#0b79d0;color:#fff}
.kidney-tool details{margin-top:12px}
.kidney-tool summary{font-weight:600;cursor:pointer}
.kidney-tool small{display:block;margin-top:8px;color:#666;font-size:13px}