:root{--bg:#f3f4f6;--panel:#fff;--ink:#111827;--muted:#6b7280;--rule:#e5e7eb;--accent:#1f2937;--warn-bg:#fef3c7;--warn-ink:#92400e}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--ink);margin:0;padding:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:14px}.harness{grid-template-columns:280px 1fr;min-height:100vh;display:grid}.panel{background:var(--panel);border-right:1px solid var(--rule);height:100vh;padding:20px;position:sticky;top:0;overflow-y:auto}.panel-title{letter-spacing:-.01em;margin:0 0 20px;font-size:14px;font-weight:600}.field{margin-bottom:14px;display:block}.field span{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:5px;font-size:11px;display:block}.field select{border:1px solid var(--rule);width:100%;font:inherit;color:inherit;background:#fff;border-radius:6px;padding:6px 8px}.stats{border-top:1px solid var(--rule);grid-template-columns:auto 1fr;gap:6px 12px;margin:24px 0 0;padding-top:16px;font-size:12px;display:grid}.stats dt{color:var(--muted)}.stats dd{font-variant-numeric:tabular-nums;overflow-wrap:anywhere;margin:0}.stat-strong{font-size:14px;font-weight:700}.warning{background:var(--warn-bg);color:var(--warn-ink);border-radius:6px;margin:20px 0 0;padding:10px 12px;font-size:11.5px;line-height:1.45}.stage{padding:24px 0 64px;overflow-x:auto}@media (max-width:900px){.harness{grid-template-columns:1fr}.panel{border-right:none;border-bottom:1px solid var(--rule);height:auto;position:static}}.field input[type=number]{border:1px solid var(--rule);width:100%;font:inherit;color:inherit;background:#fff;border-radius:6px;padding:6px 8px}.hint{color:var(--muted);margin:-6px 0 14px;font-size:11px;line-height:1.5}.hint code{background:#f3f4f6;border-radius:3px;padding:1px 3px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:10.5px}