:root{
  --bg:#0b1017; --panel:#121a24; --panel2:#0e151d; --line:#1e2b39;
  --ink:#e6eef7; --dim:#8aa0b6; --accent:#4f9dff; --accent2:#40c9a2;
  --err:#f45b69;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);
  font:15.5px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
.mono,code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
header{padding:18px 24px 6px}
.brand{font-weight:700;font-size:22px;letter-spacing:.5px}
.brand span{font-weight:500;font-size:12px;color:var(--dim);margin-left:10px;
  text-transform:uppercase;letter-spacing:2px}
.tag{color:var(--dim);font-size:14px;margin-top:4px;max-width:820px}
.tag a{color:var(--accent);text-decoration:none;white-space:nowrap}
.tag a:hover{text-decoration:underline}

main{display:grid;grid-template-columns:var(--side-w,340px) 14px 1fr;gap:0;padding:14px 24px 24px;
  align-items:start}
.gutter{align-self:stretch;min-height:100%;cursor:col-resize;position:relative;touch-action:none}
.gutter::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;
  transform:translateX(-50%);background:var(--line);border-radius:2px;transition:background .12s}
.gutter:hover::before,.gutter.drag::before{background:var(--accent);width:3px}
body.resizing{cursor:col-resize;user-select:none}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px}
.controls{position:sticky;top:14px;max-height:calc(100vh - 28px);
  overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable;
  scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.controls::-webkit-scrollbar{width:10px}
.controls::-webkit-scrollbar-track{background:transparent}
.controls::-webkit-scrollbar-thumb{background:var(--line);border-radius:8px;
  border:3px solid var(--panel)}
.controls::-webkit-scrollbar-thumb:hover{background:#2c3e52}

.field{margin-bottom:14px}
.field>label{display:block;font-size:13px;color:var(--dim);margin-bottom:5px;font-weight:600}
.field small,label small{color:var(--dim);font-weight:400}
select,input,textarea{width:100%;background:var(--panel2);border:1px solid var(--line);
  color:var(--ink);border-radius:8px;padding:8px 10px;font-size:14px;outline:none}
select:focus,input:focus,textarea:focus{border-color:var(--accent)}
textarea{resize:vertical;font-family:ui-monospace,monospace;line-height:1.5}
input[type=range]{padding:0;accent-color:var(--accent)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}

.table{display:flex;flex-direction:column;gap:6px;max-height:240px;overflow-y:auto;overflow-x:hidden;padding-right:4px}
.prow{display:grid;grid-template-columns:58px 1fr 62px 1fr;gap:7px;align-items:center}
.prow label{color:var(--ink);font-family:ui-monospace,monospace;font-size:14px}
.prow .xval{grid-column:2 / span 3}
.prow.phead{margin-bottom:-2px}
.prow.phead span{color:var(--dim);font-size:10.5px;text-align:center}
.prow .pstd{text-align:center}

button{cursor:pointer;border:1px solid var(--line);border-radius:8px;font-size:14px;
  padding:9px 12px;color:var(--ink);background:var(--panel2)}
button.ghost{width:100%;margin-top:8px;color:var(--dim)}
button.ghost:hover{color:var(--ink);border-color:var(--accent)}
.llm{margin:0 0 14px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:var(--panel2)}
.llm summary{cursor:pointer;color:var(--accent);font-size:14px;font-weight:600}
.llm .hint{color:var(--dim);font-size:12.5px;margin:8px 0}
.llm textarea{font-size:12px;line-height:1.45}
.llm #llmPrompt{opacity:.85}
button.primary{width:100%;background:linear-gradient(180deg,#2f7ff0,#2568d8);
  border-color:#2f7ff0;color:#fff;font-weight:600;font-size:15px;padding:11px}
button.primary:hover{filter:brightness(1.08)}

.error{display:none;margin-top:10px;color:var(--err);background:rgba(244,91,105,.08);
  border:1px solid rgba(244,91,105,.35);border-radius:8px;padding:8px 10px;font-size:12.5px}

.results{min-height:400px}
/* controls changed but inference hasn't re-run: dim the stale band so it is never read as
   the result for the newly loaded system */
.results.stale .plots,.results.stale .stats{opacity:.32;filter:saturate(.4)}
.stale-note{display:none;margin-bottom:10px;color:var(--accent);
  background:rgba(79,157,255,.08);border:1px solid rgba(79,157,255,.35);
  border-radius:8px;padding:8px 10px;font-size:13px}
.stats{color:var(--dim);font-size:13.5px;margin-bottom:8px}
.stats b{color:var(--ink)}
.legend{display:flex;gap:20px;color:var(--dim);font-size:13px;margin-bottom:12px;flex-wrap:wrap}
.legend i{display:inline-block;vertical-align:middle}
.legend .band{width:14px;height:10px;margin-right:2px;border-radius:2px}
.legend .band.b1{background:rgba(79,157,255,.24)}
.legend .band.b2{background:rgba(79,157,255,.36)}
.legend .line{width:16px;height:2px;background:var(--accent);margin-right:5px}
.legend .mcline{background:none;border-top:2px dashed rgba(230,238,247,.9);height:0}
.stats .mc{color:#cdd9e6}

.plots{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:14px}
.plotcell{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:6px}
.plotcell canvas{width:100%;height:200px;display:block}

footer{color:var(--dim);font-size:12.5px;padding:6px 24px 26px;max-width:1000px;line-height:1.6}
footer code{color:#9fb4c9}

@media(max-width:820px){main{grid-template-columns:1fr}
  .controls{position:static;max-height:none;overflow:visible}
  .gutter{display:none}}