:root {
  --bg: #ffffff;
  --bg-soft: #f7f8f7;
  --bg-card: #ffffff;
  --fg: #111418;
  --fg-2: #383f4d;             /* livebench body text */
  --muted: #6b7280;
  --rule: #e5e7eb;
  --rule-strong: #1a1a1a;       /* livebench-style dark header underline */
  --accent: #5b8c5f;             /* METR sage */
  --accent-dark: #466b48;
  --accent-soft: #e8efe7;
  --leader-bg: #eef4ed;
  --leader-fg: #2f5e35;
  --link: #2456c4;               /* livebench-style blue */
  --code-bg: #f1f3f4;
  --tbl-zebra: #f5f6f6;
  --max-w: 960px;
  --chart-max-w: 1080px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--fg-2);
  font-family: var(--font-sans);
  font-size: 15px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; border-bottom: 1px solid rgba(36,86,196,0.25); transition: border-color 0.12s ease; }
a:hover { border-bottom-color: var(--link); }

main { max-width: var(--max-w); margin: 0 auto; padding: 56px 24px 80px; }

/* ---------------- header ---------------- */
header.hero {
  text-align: center;
  padding: 80px 24px 48px;
  background: var(--bg);
}
header.hero h1 {
  font-size: 2.8rem;
  margin: 0 0 16px;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--fg);
  line-height: 1.1;
}
header.hero .subtitle {
  font-size: 1.18rem;
  color: var(--fg-2);
  font-style: normal;
  max-width: 640px;
  margin: 0 auto;
  font-weight: 500;
  line-height: 1.45;
}
header.hero .meta {
  margin-top: 22px;
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}

/* CTAs — pill buttons (METR/livebench shared style) */
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 30px 0 4px; justify-content: center; }
.cta {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 20px;
  border: 1px solid var(--rule);
  color: var(--fg);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--bg);
  border-bottom-color: var(--rule);
  transition: all 0.15s ease;
  font-family: var(--font-sans);
}
.cta:hover { background: var(--bg-soft); border-color: var(--muted); color: var(--fg); border-bottom-color: var(--muted); }
.cta.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  border-bottom-color: var(--accent);
}
.cta.primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); border-bottom-color: var(--accent-dark); color: white; }
.cta .arrow { display: inline-block; transition: transform 0.15s ease; }
.cta:hover .arrow { transform: translateX(2px); }

/* ---------------- section headings ---------------- */
h2 {
  font-size: 1.65rem;
  margin-top: 3em; margin-bottom: 0.5em;
  border: none; padding: 0;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--fg);
}
h3 {
  font-size: 1.08rem;
  margin-top: 2em; margin-bottom: 0.4em;
  font-weight: 700; color: var(--fg);
}

p { margin: 0.7em 0; color: var(--fg-2); }
ul, ol { padding-left: 1.4em; color: var(--fg-2); }
li { margin: 0.4em 0; }
strong { color: var(--fg); font-weight: 700; }
em { font-style: italic; color: var(--fg-2); }
.muted { color: var(--muted); font-weight: normal; }

/* callouts */
.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
  color: var(--fg-2);
  border-radius: 0 8px 8px 0;
}
.callout strong { color: var(--fg); }

/* ---------------- chart ---------------- */
.chart-section {
  max-width: var(--chart-max-w);
  margin: 32px auto 0;
  padding: 0 24px;
}
.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 30px 30px 22px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.025);
}
.chart-title-row {
  text-align: center;
  margin-bottom: 4px;
}
.chart-title-row h2 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.chart-title-row #chart-caption {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}
#scatter-chart { min-height: 380px; margin-top: 16px; }

/* field pills — segmented selector below the chart */
.field-pills {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 18px;
}
.field-pill {
  padding: 6px 14px;
  border: 1px solid transparent;
  background: var(--bg-soft);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  transition: all 0.12s ease;
  font-family: var(--font-sans);
}
.field-pill:hover { background: #eaedeb; color: var(--fg); }
.field-pill.active {
  background: var(--fg);
  color: white;
}
.field-pill.active:hover { background: var(--fg); }

/* CTA section that sits below the chart */
.cta-section {
  max-width: var(--chart-max-w);
  margin: 28px auto 0;
  padding: 0 24px;
}
.cta-section .cta-row { margin: 0; }

/* legacy chart-controls (kept harmless in case any view re-introduces a select) */
.chart-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  margin-top: 14px;
  font-size: 0.84rem;
  flex-wrap: wrap;
}
.chart-controls label {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-right: 4px;
}
.chart-controls select {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 7px 32px 7px 14px;
  border: 1px solid var(--rule);
  background-color: var(--bg-soft);
  border-radius: 999px;
  color: var(--fg);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  transition: all 0.12s ease;
}
.chart-controls select:hover { border-color: var(--muted); background-color: #eef0f0; }
.chart-controls select:focus { outline: none; border-color: var(--fg); }

.chart-legend-row {
  display: flex;
  justify-content: center;
  gap: 22px;
  margin-top: 16px;
  font-size: 0.82rem;
  color: var(--fg-2);
  flex-wrap: wrap;
  font-weight: 500;
}
.chart-legend-row .lg-item { display: inline-flex; align-items: center; gap: 7px; }
.chart-legend-row .dot {
  width: 11px; height: 11px; border-radius: 50%;
  display: inline-block; flex-shrink: 0;
  border: 1.5px solid #fff;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.08);
}
.chart-foot-note {
  text-align: center;
  font-size: 0.77rem;
  color: var(--muted);
  margin: 12px 0 0;
  font-style: italic;
}
.chart-foot-note.partial {
  margin-top: 4px;
  font-size: 0.73rem;
  opacity: 0.85;
}

/* "Fully Correct = 0%" cell — gentle emphasis without shouting */
td.fully-correct-zero {
  color: var(--muted);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* small italic setup/methodology note that sits under a table */
.setup-note {
  font-size: 0.78rem;
  color: var(--muted);
  font-style: italic;
  text-align: center;
  margin: 14px auto 0;
  max-width: 760px;
  line-height: 1.55;
}

/* svg */
.scatter-svg {
  display: block; width: 100%; height: auto;
  font-family: var(--font-sans);
}
.scatter-svg .axis { stroke: #d1d5db; stroke-width: 1; }
.scatter-svg .grid { stroke: #f0f1f0; stroke-width: 1; }
.scatter-svg .tick-mark { stroke: #d1d5db; stroke-width: 1; }
.scatter-svg .tick-label-x { fill: #6b7280; font-size: 11px; text-anchor: middle; }
.scatter-svg .tick-label-y { fill: #6b7280; font-size: 11px; text-anchor: end; }
.scatter-svg .axis-title { fill: #4a4a4a; font-size: 12px; text-anchor: middle; font-weight: 600; }
.scatter-svg .trendline { stroke: var(--accent); stroke-width: 1.4; stroke-dasharray: 5 4; opacity: 0.6; }
.scatter-svg .errbar { stroke: #9ca3af; stroke-width: 1; opacity: 0.5; }
.scatter-svg .scatter-dot { cursor: pointer; transition: r 0.12s ease; }
.scatter-svg .scatter-dot:hover { r: 9; }
.scatter-svg .scatter-label {
  font-size: 11.5px;
  font-weight: 600;
  pointer-events: none;
}

.scatter-tooltip {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s ease;
  background: rgba(17,20,24,0.95);
  color: white;
  padding: 7px 11px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  z-index: 10;
  max-width: 280px;
  white-space: nowrap;
  box-shadow: 0 6px 16px rgba(0,0,0,0.18);
}

/* ---------------- tables (livebench-inspired compact) ---------------- */
.table-wrap { overflow-x: auto; margin: 18px 0; }
table {
  border-collapse: collapse;
  width: 100%;
  margin: 0;
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}
caption.note {
  caption-side: bottom;
  font-size: 0.78rem;
  color: var(--muted);
  font-style: italic;
  text-align: left;
  padding: 12px 0 0;
}
th, td {
  padding: 9px 12px;
  text-align: right;
  color: var(--fg);
}
th {
  background: transparent;
  font-weight: 700;
  user-select: none;
  white-space: nowrap;
  color: var(--fg);
  border-bottom: 1.5px solid var(--rule-strong);
  font-size: 0.82rem;
  text-align: right;
}
th.sortable { cursor: pointer; }
th.sortable:hover { color: var(--accent-dark); }
th:first-child, td:first-child { text-align: left; }
th.sortable::after { content: " \2195"; opacity: 0.4; font-size: 0.82em; }
th.sorted-asc::after  { content: " \2191"; opacity: 1; color: var(--accent); }
th.sorted-desc::after { content: " \2193"; opacity: 1; color: var(--accent); }
tbody tr td { border-top: 1px solid #ddd; }
tbody tr:first-child td { border-top: none; }
tbody tr:nth-child(odd) td { background: var(--tbl-zebra); }
tbody tr:nth-child(even) td { background: var(--bg); }
tbody tr:hover td { background: var(--accent-soft); }
td.leader { background: var(--leader-bg) !important; font-weight: 700; color: var(--leader-fg); }
tr.row-total td { border-top: 2px solid var(--rule-strong); background: var(--bg-soft) !important; font-weight: 700; }
tr.row-total td.leader { background: var(--leader-bg) !important; }

/* code */
code, kbd {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: var(--font-mono);
  color: var(--fg);
}

/* ---------------- footer ---------------- */
footer {
  border-top: 1px solid var(--rule);
  margin-top: 80px;
  padding: 32px 24px 40px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}
footer a { color: var(--muted); border-bottom-color: rgba(0,0,0,0.18); }

/* ---------------- responsive ---------------- */
@media (max-width: 700px) {
  header.hero { padding: 52px 14px 32px; }
  header.hero h1 { font-size: 2.1rem; }
  header.hero .subtitle { font-size: 1.02rem; }
  main { padding: 36px 14px 60px; }
  .chart-section { padding: 0 14px; }
  .chart-card { padding: 20px 16px 16px; border-radius: 12px; }
  .chart-title-row h2 { font-size: 1.12rem; }
  table { font-size: 0.82rem; }
  th, td { padding: 7px 9px; }
  .chart-legend-row { gap: 14px; font-size: 0.78rem; }
}