:root {
  --bg:      #0c0e12;
  --panel:   #12151b;
  --panel-2: #171b22;
  --line:    #242a34;
  --line-2:  #2f3745;
  --ink:     #e8ecf2;
  --ink-2:   #9aa5b4;
  --ink-3:   #6b7686;
  --accent:  #35b778;   /* viridis green */
  --teal:    #25828e;
  --amber:   #b5dd2b;
  --bad:     #c65a4a;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Inter, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
b, strong { font-weight: 600; color: var(--ink); }
.muted { color: var(--ink-2); }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.cap {
  font-size: 10.5px; letter-spacing: .07em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 500;
}
code {
  font-family: var(--mono); font-size: .92em;
  background: var(--panel-2); border: 1px solid var(--line);
  padding: 1px 5px; border-radius: 4px; color: var(--ink-2);
}

/* ---------------- top bar ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px 22px;
  background: rgba(12,14,18,.86);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.pip {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
}
.slash { color: var(--line-2); }
.topstats { display: flex; gap: 18px; font-size: 12px; color: var(--ink-3); }
.topstats b { font-family: var(--mono); color: var(--ink); font-weight: 500; }
@media (max-width: 760px) { .topstats span:nth-child(n+3) { display: none; } }

main { max-width: 1120px; margin: 0 auto; padding: 26px 22px 40px; }

/* ---------------- abstract ---------------- */
.abstract { margin-bottom: 26px; }
.abstract h1 {
  font-size: clamp(21px, 2.4vw, 28px); font-weight: 600; letter-spacing: -.015em;
  margin: 0 0 14px; line-height: 1.22; max-width: 30ch;
}
.abs-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 26px; align-items: start; }
.abs { margin: 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.62; }
.abs b { color: var(--ink); }

.ideas { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.ideas li {
  display: flex; gap: 11px;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 11px 13px;
}
.ideas .k {
  font-family: var(--mono); font-size: 10px; color: var(--teal);
  padding-top: 2px; letter-spacing: .04em;
}
.ideas b { display: block; font-size: 13px; margin-bottom: 2px; }
.ideas div { font-size: 12.5px; color: var(--ink-3); line-height: 1.5; }
.ideas i { color: var(--ink-2); font-style: italic; }

/* ---------------- lab ---------------- */
.lab {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; overflow: hidden; margin-bottom: 26px;
}
.lab-head {
  display: flex; align-items: center; gap: 16px;
  padding: 10px 14px; border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.lab-head h2 { font-size: 13px; font-weight: 600; margin: 0; margin-right: auto; }
.modes { display: flex; background: var(--bg); border: 1px solid var(--line); border-radius: 7px; padding: 2px; }
.mode {
  font: 500 12px var(--sans); color: var(--ink-3);
  background: none; border: 0; border-radius: 5px;
  padding: 5px 11px; cursor: pointer; transition: color .12s, background .12s;
}
.mode:hover { color: var(--ink); }
.mode.active { background: var(--line); color: var(--ink); }
.steps-field { display: flex; align-items: center; gap: 7px; }
.steps-field label {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3);
}
.steps-field input {
  width: 58px; font: 500 12px var(--mono); color: var(--ink);
  background: var(--bg); border: 1px solid var(--line-2); border-radius: 6px;
  padding: 4px 6px;
}
.steps-field input:disabled { opacity: .45; cursor: not-allowed; }

.toggle {
  display: flex; align-items: center; gap: 6px; cursor: pointer;
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3);
  user-select: none;
}
.toggle:hover { color: var(--ink-2); }
.toggle input { accent-color: var(--accent); width: 13px; height: 13px; cursor: pointer; margin: 0; }
.speed { display: flex; align-items: center; gap: 8px; }
.speed label { font-size: 10.5px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); }
.speed .num { font-size: 11px; color: var(--ink-2); min-width: 42px; }
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 92px; height: 3px; border-radius: 99px;
  background: var(--line-2); outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 0; cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px; border: 0; border-radius: 50%; background: var(--accent); cursor: pointer;
}

/* model selector */
.variant-bar {
  display: grid; grid-template-columns: auto auto 1fr;
  align-items: center; gap: 8px 16px;
  padding: 10px 16px; border-bottom: 1px solid var(--line);
}
.variant-pick { display: flex; align-items: center; gap: 8px; }
select {
  font: 500 12.5px var(--sans); color: var(--ink);
  background: var(--bg); border: 1px solid var(--line-2); border-radius: 6px;
  padding: 5px 8px; cursor: pointer; min-width: 250px;
}
select:disabled { opacity: .5; cursor: progress; }
.variant-meta { display: flex; align-items: baseline; gap: 10px; }
.variant-meta .num { font-size: 12.5px; color: var(--accent); }
.backend {
  border: 1px solid var(--line-2); border-radius: 4px;
  padding: 1px 5px; color: var(--ink-3);
}
.backend.gpu { border-color: var(--teal); color: var(--teal); }
.variant-blurb {
  grid-column: 1 / -1; margin: 0;
  font-size: 12px; color: var(--ink-3); line-height: 1.5; max-width: 92ch;
}

.lab-body {
  position: relative;
  display: grid; grid-template-columns: 178px 1fr 244px;
  gap: 18px; padding: 16px;
}
/* traces from each circle out to the rollout chart; purely decorative overlay */
.wires {
  position: absolute; inset: 0; z-index: 2;
  pointer-events: none; overflow: visible;
}
@media (max-width: 1000px) { .wires { display: none; } }

/* left rail */
.pane { display: flex; flex-direction: column; gap: 8px; }
.pane.hidden { display: none; }
.tiles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 5px; }
.tile {
  position: relative; padding: 0; border: 1px solid var(--line);
  background: var(--bg); border-radius: 6px; cursor: pointer; overflow: hidden;
  transition: border-color .12s, transform .1s;
}
.tile:hover { border-color: var(--line-2); }
.tile.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.tile canvas { width: 100%; aspect-ratio: 1; display: block; image-rendering: pixelated; }
.tile .badge {
  position: absolute; top: 3px; left: 4px;
  font: 500 9.5px var(--mono); color: #cfe9d8;
  background: rgba(8,10,14,.72); padding: 0 4px; border-radius: 3px;
}

.draw-canvas {
  width: 100%; aspect-ratio: 1; border-radius: 8px;
  background: #0f1319; border: 1px dashed var(--line-2);
  cursor: crosshair; touch-action: none;
}
.draw-controls { display: flex; gap: 6px; }
.btn {
  flex: 1; font: 500 12.5px var(--sans);
  padding: 7px 10px; border-radius: 6px; cursor: pointer;
  border: 1px solid var(--line-2); background: var(--panel-2); color: var(--ink-2);
  transition: background .12s, color .12s;
}
.btn:hover { background: var(--line); color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #06110b; font-weight: 600; }
.btn.primary:hover { background: #4ac98a; color: #06110b; }
.btn:disabled { opacity: .45; cursor: default; }
.hint { margin: 0; font-size: 11.5px; color: var(--ink-3); min-height: 16px; }

/* stage */
.stage { display: flex; flex-direction: column; gap: 8px; align-items: center; }
.grid-canvas {
  width: 100%; max-width: 420px; aspect-ratio: 1;
  border-radius: 8px; border: 1px solid var(--line);
  image-rendering: pixelated; background: #440154;
  /* routing channels above and below, for the traces in wires.js */
  margin: 44px 0;
}
@media (max-width: 1000px) { .grid-canvas { margin: 0; } }
.stage-foot { display: flex; justify-content: space-between; width: 100%; max-width: 420px; }

/* readout */
.readout { display: flex; flex-direction: column; gap: 14px; }
.pred { display: flex; flex-direction: column; gap: 2px; }
.pred-row { display: flex; align-items: baseline; gap: 10px; }
.pred-value {
  font-family: var(--mono); font-size: 46px; font-weight: 500; line-height: 1;
  color: var(--accent); letter-spacing: -.02em;
}
.pred-value.wrong { color: var(--bad); }
.pred-value.idle { color: var(--ink-3); }
.pred-tag { font-size: 11px; color: var(--ink-3); font-family: var(--mono); }
.chart { display: flex; flex-direction: column; gap: 5px; }
.chart-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.chart-head .num { color: var(--ink-2); text-transform: none; letter-spacing: 0; }
.bars-canvas, .lines-canvas {
  width: 100%; height: auto;
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px;
}
.note { margin: auto 0 0; font-size: 11.5px; color: var(--ink-3); line-height: 1.45; }

/* ---------------- stats ---------------- */
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 12px; margin-bottom: 26px;
}
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px; display: flex; flex-direction: column; gap: 10px;
}
.card.wide { grid-column: span 3; }
.card header { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.card h3 { font-size: 13px; font-weight: 600; margin: 0; }
.cardnote { margin: auto 0 0; font-size: 11.5px; color: var(--ink-3); line-height: 1.5; }
.cardnote b { color: var(--ink-2); font-family: var(--mono); font-weight: 500; }
.curve { width: 100%; }
.curve svg { width: 100%; height: 132px; display: block; }

/* bar rows (ablations + transfer) */
.abl, .horizon { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.abl li { display: grid; grid-template-columns: 88px 1fr 44px; align-items: center; gap: 8px; }
.abl .lbl { font-size: 11.5px; color: var(--ink-2); }
.abl .track { display: block; height: 6px; background: var(--bg); border-radius: 99px; overflow: hidden; }
.abl .fill { display: block; height: 100%; border-radius: 99px; background: var(--teal); }
.abl .fill.good { background: var(--accent); }
.abl .fill.bad  { background: var(--bad); }
.abl .val { font: 500 11.5px var(--mono); color: var(--ink); text-align: right; }
.abl .grp { font-size: 10px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); grid-column: 1 / -1; margin-top: 3px; }
.abl .grp:first-child { margin-top: 0; }

.horizon li {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 7px 0; border-bottom: 1px solid var(--line);
}
.horizon li:last-child { border-bottom: 0; }
.horizon .t { font: 500 11.5px var(--mono); color: var(--ink-2); }
.horizon .a { font: 500 14px var(--mono); color: var(--ink); }
.horizon .a.dim { color: var(--ink-2); }

/* ---------------- spec ---------------- */
.spec {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px;
}
.spec h3 { font-size: 13px; font-weight: 600; margin: 0 0 10px; }
.spec dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px 20px; margin: 0; }
.spec dl div { display: flex; gap: 10px; align-items: baseline; border-bottom: 1px solid var(--line); padding-bottom: 6px; }
.spec dt { font-size: 10.5px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); min-width: 62px; }
.spec dd { margin: 0; font-size: 12.5px; color: var(--ink-2); font-family: var(--mono); }

footer {
  max-width: 1120px; margin: 0 auto; padding: 16px 22px 44px;
  display: flex; flex-direction: column; gap: 4px;
  font-size: 11.5px; color: var(--ink-3);
  border-top: 1px solid var(--line);
}

/* ---------------- responsive ---------------- */
@media (max-width: 620px) {
  .lab-head { flex-wrap: wrap; }
  .lab-head h2 { width: 100%; margin-right: 0; }
  .speed { margin-left: auto; }
}
@media (max-width: 1000px) {
  .lab-body { grid-template-columns: 1fr; }
  .rail { max-width: 420px; }
  .readout { max-width: 420px; }
  .abs-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .card.wide { grid-column: span 1; }
  .spec dl { grid-template-columns: 1fr; }
}