:root {
    color-scheme: light;
    --page: #f9f9f7; --surface: #fcfcfb; --ink: #0b0b0b; --ink-2: #52514e; --muted: #898781;
    --grid: #e1e0d9; --axis: #c3c2b7; --ring: rgba(11,11,11,0.10); --wash: rgba(11,11,11,0.06);
    --product: #2a78d6; --memory: #eb6834; --learner: #1baf7a; --neutral: #f0efec;
    --spike: #0b0b0b; --select: rgba(42,120,214,0.14);
    --heat-1: #cde2fb; --heat-2: #86b6ef; --heat-3: #3987e5; --heat-4: #1c5cab; --heat-5: #0d366b;   /* firing, quiet -> busy */
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      color-scheme: dark;
      --page: #0d0d0d; --surface: #1a1a19; --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
      --grid: #2c2c2a; --axis: #383835; --ring: rgba(255,255,255,0.10); --wash: rgba(255,255,255,0.06);
      --product: #3987e5; --memory: #d95926; --learner: #199e70; --neutral: #383835;
      --spike: #f0efec; --select: rgba(57,135,229,0.22);
      --heat-1: #104281; --heat-2: #1c5cab; --heat-3: #2a78d6; --heat-4: #6da7ec; --heat-5: #b7d3f6;
    }
  }
  :root[data-theme="dark"] {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --ring: rgba(255,255,255,0.10); --wash: rgba(255,255,255,0.06);
    --product: #3987e5; --memory: #d95926; --learner: #199e70; --neutral: #383835;
    --spike: #f0efec; --select: rgba(57,135,229,0.22);
    --heat-1: #104281; --heat-2: #1c5cab; --heat-3: #2a78d6; --heat-4: #6da7ec; --heat-5: #b7d3f6;
  }
  * { box-sizing: border-box; }
  body { margin: 0; background: var(--page); color: var(--ink); font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
  header { padding: 16px 24px 8px; display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: baseline; }
  header h1 { font-size: 18px; margin: 0; font-weight: 600; }
  header .meta { color: var(--ink-2); font-size: 13px; flex: 1 1 320px; }
  main { padding: 0 24px 32px; display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); max-width: 1400px; }
  section { background: var(--surface); border: 1px solid var(--ring); border-radius: 8px; padding: 16px; min-width: 0; }
  h2 { font-size: 14px; font-weight: 600; margin: 0 0 4px; }
  .sub { color: var(--ink-2); font-size: 12.5px; margin: 0 0 12px; }
  .muted { color: var(--muted); }
  .row2 { display: grid; gap: 16px; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  @media (max-width: 900px) { .row2 { grid-template-columns: minmax(0, 1fr); } main, header { padding-left: 16px; padding-right: 16px; } }

  /* transcript */
  .turn { margin: 0 0 12px; }
  .who { font-size: 12px; color: var(--muted); margin: 0 0 2px; }
  .user-text span.unknown { color: var(--muted); text-decoration: line-through; }
  .reply { display: flex; flex-wrap: wrap; gap: 6px 2px; align-items: flex-start; }
  .chip { display: inline-flex; flex-direction: column; align-items: stretch; padding: 2px 4px 0; border-radius: 4px; cursor: pointer;
          border: 1px solid transparent; background: none; color: var(--ink); font: inherit; }
  .chip:hover { background: var(--wash); }
  .chip.sel { background: var(--select); }
  .chip.copied { border-color: var(--ink-2); }
  .chip .bar { height: 4px; border-radius: 2px; margin-top: 2px; }
  .chip.end { color: var(--muted); }
  .legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 12px; color: var(--ink-2); margin: 8px 0 0; align-items: center; }
  .legend .sw { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -2px; margin-right: 4px; }
  .legend .ramp { display: inline-block; width: 120px; height: 6px; border-radius: 3px; vertical-align: 1px; margin: 0 6px;
                  background: linear-gradient(90deg, var(--memory), var(--neutral), var(--learner)); }
  .legend .box { display: inline-block; width: 14px; height: 12px; border: 1px solid var(--ink-2); border-radius: 3px; vertical-align: -2px; margin-right: 4px; }

  /* who chose */
  .who-bars { display: grid; grid-template-columns: 76px minmax(0, 1fr) 56px; gap: 6px 8px; align-items: center; font-size: 13px; }
  .track { position: relative; height: 14px; }
  .track .fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 0 4px 4px 0; min-width: 2px; }
  .num { font-variant-numeric: tabular-nums; text-align: right; color: var(--ink-2); }
  .facts { margin: 12px 0 0; font-size: 13px; color: var(--ink-2); }
  .facts b { color: var(--ink); font-weight: 600; }
  .alts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
  @media (max-width: 560px) { .alts { grid-template-columns: minmax(0, 1fr); } }
  .alts h3 { font-size: 12.5px; font-weight: 600; margin: 0 0 6px; display: flex; align-items: center; gap: 6px; }
  .alts h3 .sw { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
  .alt { display: grid; grid-template-columns: minmax(0, 1fr) 40px; gap: 2px 6px; font-size: 12.5px; align-items: center; margin-bottom: 4px; }
  .alt .w { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .alt .w.chosen { font-weight: 700; }
  .alt .t { grid-column: 1 / -1; height: 4px; }
  .alt .t .fill { height: 4px; border-radius: 0 2px 2px 0; min-width: 2px; }
  .prov { font-size: 13px; }
  .prov ol { margin: 4px 0 8px 18px; padding: 0; color: var(--ink-2); }
  .prov .quote { color: var(--ink-2); border-left: 2px solid var(--axis); padding: 2px 0 2px 8px; margin: 4px 0; }

  /* raster */
  .raster-wrap { overflow-x: auto; border-top: 1px solid var(--grid); padding-top: 8px; }
  .raster-wrap canvas { display: block; }
  .layer-label { font-size: 12px; color: var(--ink-2); margin: 8px 0 2px; }

  /* small charts */
  .charts { display: grid; gap: 16px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  @media (max-width: 900px) { .charts { grid-template-columns: minmax(0, 1fr); } }
  svg text { fill: var(--muted); font: 11px system-ui, -apple-system, "Segoe UI", sans-serif; }
  .tip { position: fixed; pointer-events: none; background: var(--surface); color: var(--ink); border: 1px solid var(--ring);
         border-radius: 6px; padding: 6px 8px; font-size: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.12); display: none; z-index: 10; max-width: 280px; }
  .drop { border: 1px dashed var(--axis); border-radius: 8px; padding: 32px; text-align: center; color: var(--ink-2); }
  table { border-collapse: collapse; font-size: 12px; width: 100%; }
  th, td { padding: 3px 6px; border-bottom: 1px solid var(--grid); text-align: right; font-variant-numeric: tabular-nums; }
  th:first-child, td:first-child, th:nth-child(2), td:nth-child(2) { text-align: left; }
  details summary { cursor: pointer; color: var(--ink-2); font-size: 13px; }
  .tablewrap { overflow-x: auto; margin-top: 8px; }

  /* the chat page */
  .composer { display: flex; gap: 8px; margin: 12px 0 0; }
  .composer textarea { flex: 1; min-width: 0; resize: vertical; min-height: 44px; max-height: 200px; padding: 8px 10px; border-radius: 6px;
                       border: 1px solid var(--axis); background: var(--page); color: var(--ink); font: inherit; }
  .composer button, .linkbtn { padding: 8px 14px; border-radius: 6px; border: 1px solid var(--axis); background: var(--surface); color: var(--ink);
                     font: inherit; cursor: pointer; }
  .composer button[type=submit] { background: var(--product); border-color: var(--product); color: #fff; }
  .composer button:disabled { opacity: 0.5; cursor: default; }
  .status { min-height: 1.45em; margin: 6px 0 0; font-size: 13px; color: var(--ink-2); }
  .status.error { color: var(--ink); }
  .about { color: var(--ink-2); font-size: 13px; margin: 0 24px 12px; max-width: 900px; }
  @media (max-width: 900px) { .about { margin: 0 16px 12px; } }
  [hidden] { display: none !important; }

  /* neuron map */
  .sechead { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin: 0 0 4px; }
  .sechead h2 { margin: 0; }
  .sechead .linkbtn { padding: 4px 12px; font-size: 13px; }
  .sechead .ctrls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
  .seg { display: inline-flex; align-items: center; border: 1px solid var(--axis); border-radius: 6px; overflow: hidden; font-size: 13px; }
  .seg .seg-label { padding: 4px 8px; color: var(--muted); }
  .seg button { padding: 4px 10px; border: 0; border-left: 1px solid var(--axis); background: var(--surface); color: var(--ink-2); font: inherit; cursor: pointer; }
  .seg button[aria-pressed="true"] { background: var(--wash); color: var(--ink); font-weight: 600; }
  .heat-legend { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: center; font-size: 11.5px; color: var(--muted); margin: -2px 0 8px; }
  .heat-legend .hl-ramp { width: 96px; height: 8px; border-radius: 2px;
    background: linear-gradient(90deg, var(--heat-1), var(--heat-2), var(--heat-3), var(--heat-4), var(--heat-5)); }
  .heat-legend .hl-top { color: var(--ink-2); }
  .heat-legend .hl-top::before { content: "top "; color: var(--muted); }
  .heat-legend .hl-what { flex-basis: 100%; text-align: center; }
  .maps { display: grid; gap: 24px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  @media (max-width: 900px) { .maps { grid-template-columns: minmax(0, 1fr); } }
  .map { min-width: 0; }
  .map canvas { display: block; margin: 4px auto 8px; }
  .groups { font-size: 12.5px; }
  .grp { display: grid; grid-template-columns: 20px minmax(0, 1fr) 72px 36px; gap: 8px; align-items: center; padding: 3px 4px; border-radius: 4px; }
  .grp.hover { background: var(--select); }
  .grp.head { color: var(--muted); font-size: 11.5px; padding-bottom: 0; }
  .grp.head span:nth-child(3) { grid-column: 3 / 5; }
  .grp .gnum { font-weight: 600; color: var(--ink-2); text-align: right; }
  .grp .gtxt { color: var(--ink-2); }
  .grp .gtxt b { color: var(--ink); font-weight: 600; }
  .grp .gtxt i { color: var(--ink); font-style: normal; }
  .grp .track { height: 10px; background: var(--wash); border-radius: 2px; }
  .grp .track .fill { display: block; height: 10px; background: var(--spike); border-radius: 2px; }