:root {
  color-scheme: light dark;
  --bg: #f7f4ef;
  --panel: #fffaf2;
  --panel-strong: #ffffff;
  --text: #241f1a;
  --muted: #71685d;
  --line: #ded4c5;
  --accent: #8d4f20;
  --pass: #177245;
  --fail: #a52a2a;
  --warn: #946200;
  --code: #1f2937;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171412;
    --panel: #211d19;
    --panel-strong: #2a251f;
    --text: #f2e8dc;
    --muted: #b5a89a;
    --line: #40382f;
    --accent: #e09a5f;
    --pass: #69d194;
    --fail: #ff8a80;
    --warn: #e3bd63;
    --code: #f2e8dc;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding: 28px clamp(18px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  flex: 0 0 auto;
  z-index: 2;
}

.eyebrow {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  margin: 0 0 6px;
  text-transform: uppercase;
}

h1, h2, h3 { margin: 0; }
h1 { font-size: clamp(24px, 4vw, 40px); }
h2 { font-size: 24px; margin-bottom: 14px; }
h3 { font-size: 17px; margin-bottom: 10px; }
.subtitle {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
}
.title-link {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.title-link:hover { color: var(--accent); }

nav, .topbar-controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: end; }
.run-picker {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.run-picker[hidden] { display: none; }
.run-picker select {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-strong);
  color: var(--text);
  font: inherit;
  letter-spacing: normal;
  min-width: 190px;
  padding: 8px 32px 8px 13px;
  text-transform: none;
}
button, .link-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  padding: 8px 13px;
}
button:hover, .link-button:hover, button.active { border-color: var(--accent); color: var(--accent); }
#back-button { margin-bottom: 18px; }

.shell {
  width: min(1500px, 100%);
  margin: 0 auto;
  padding: 28px clamp(18px, 4vw, 48px) 56px;
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
}
.shell.split {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding-bottom: 24px;
}

.grid { display: grid; gap: 18px; }
.split-layout {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  gap: 18px;
  align-items: stretch;
}
.split-layout.models-layout { grid-template-columns: minmax(280px, 420px) minmax(0, 1fr); }
.split-layout.problem-layout { grid-template-columns: minmax(180px, 280px) minmax(0, 1fr); }
.split-pane {
  min-height: 0;
  overflow: auto;
}
.split-pane.detail-pane {
  display: grid;
  gap: 18px;
  align-content: start;
}
@media (max-width: 900px) {
  .split-layout.models-layout, .split-layout.problem-layout {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(160px, 32vh) minmax(0, 1fr);
  }
  .problem-source-grid { grid-template-columns: 1fr; }
  .topbar, .topbar-controls { align-items: start; flex-direction: column; }
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 1px 0 rgba(0,0,0,.03);
}

.chart-card { overflow: hidden; }
.chart-wrap { width: 100%; }
.cost-score-chart {
  display: block;
  width: 100%;
  height: auto;
  max-height: 520px;
}
.chart-grid {
  stroke: var(--line);
  stroke-width: 1;
}
.chart-tick, .chart-axis {
  fill: var(--muted);
  font-size: 12px;
}
.chart-axis { font-weight: 700; letter-spacing: .04em; }
.chart-point {
  cursor: pointer;
  outline: none;
  transition: opacity .12s ease;
}
.chart-point circle {
  stroke: var(--panel);
  stroke-width: 2;
}
.chart-leader {
  stroke: var(--muted);
  stroke-width: 1;
  opacity: .45;
}
.chart-point text {
  fill: var(--text);
  font-size: 12px;
  font-weight: 600;
}
.cost-score-chart.is-focusing .chart-point,
.cost-score-chart:has(.chart-point:focus-visible) .chart-point {
  opacity: .4;
}
.cost-score-chart.is-focusing .chart-point.is-active,
.cost-score-chart .chart-point:focus-visible {
  opacity: 1;
}
.chart-point.is-active circle, .chart-point:focus-visible circle { stroke-width: 3; }
.chart-point.is-active text, .chart-point:focus-visible text { fill: var(--accent); }
.chart-point.hue-openai circle { fill: #3d9a6a; }
.chart-point.hue-anthropic circle { fill: #d4783a; }
.chart-point.hue-xai circle { fill: #8b7cd6; }
.chart-point.hue-google circle { fill: #5aa0d6; }
.chart-point.hue-other circle { fill: var(--accent); }

table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
tr.clickable { cursor: pointer; }
tr.clickable:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }

.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  display: inline-flex;
  font-size: 12px;
  font-weight: 700;
  gap: 5px;
  padding: 3px 8px;
}
.pass { color: var(--pass); border-color: color-mix(in srgb, var(--pass) 55%, var(--line)); }
.fail { color: var(--fail); border-color: color-mix(in srgb, var(--fail) 55%, var(--line)); }
.warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 55%, var(--line)); }
.muted { color: var(--muted); }
.footnote {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.list { display: grid; gap: 10px; }
.list button { width: 100%; text-align: left; border-radius: 14px; }
.list button.active { background: color-mix(in srgb, var(--accent) 12%, var(--panel-strong)); }

.problem-image {
  width: 100%;
  max-height: 720px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-strong);
  object-fit: contain;
  cursor: zoom-in;
}
.problem-source-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}
.problem-source-panel {
  min-width: 0;
}
.problem-source-link {
  margin: 10px 0 0;
  font-size: 14px;
}
.link-sep {
  color: var(--muted);
}
.methodology-card {
  max-width: none;
}
.methodology-md h1 { font-size: 1.6rem; margin: 0 0 .6em; }
.methodology-md h2 { font-size: 1.2rem; margin: 1.4em 0 .5em; }
.methodology-md p { line-height: 1.55; color: var(--code); }
.methodology-md ul { padding-left: 1.2em; color: var(--code); }
.methodology-md a { color: inherit; }
.methodology-md a:hover { color: var(--accent); }
.scroll-md {
  max-height: 720px;
  overflow: auto;
  color: var(--code);
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
  line-height: 1.5;
}
.scroll-md > :first-child { margin-top: 0; }
.scroll-md > :last-child { margin-bottom: 0; }
.scroll-md h1, .scroll-md h2, .scroll-md h3, .scroll-md h4 {
  margin: 1em 0 .45em;
  line-height: 1.25;
}
.scroll-md h1 { font-size: 1.35rem; }
.scroll-md h2 { font-size: 1.15rem; }
.scroll-md h3 { font-size: 1.02rem; }
.scroll-md p { margin: .55em 0; }
.scroll-md ul { margin: .45em 0; padding-left: 1.25em; }
.scroll-md li { margin: .2em 0; }
.scroll-md code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .92em;
}
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(20, 16, 12, .82);
}
.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: min(96vw, 1400px);
  max-height: 90vh;
  border-radius: 12px;
  box-shadow: 0 12px 48px rgba(0, 0, 0, .45);
  background: var(--panel-strong);
  object-fit: contain;
}
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 18px;
  border-radius: 999px;
}

pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--code);
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  margin: 0;
  line-height: 1.45;
}

details {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-strong);
  padding: 10px 12px;
}
details + details { margin-top: 10px; }
summary, .turn-heading {
  font-weight: 700;
  color: var(--text);
}
summary { cursor: pointer; }
details pre { border: 0; padding: 10px 0 0; background: transparent; }

.transcript { display: grid; gap: 12px; }
.turn { display: grid; gap: 10px; }
.turn-block {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-strong);
  padding: 10px 12px;
}
.turn-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.turn-block.thinking { border-color: var(--warn); }
.turn-block.tool, .turn-block.tool-result { border-color: var(--accent); }
.turn-block.output { border-color: color-mix(in srgb, var(--pass) 35%, var(--line)); }
.turn-block.prompt, .turn-block.role-system { border-color: var(--line); }
.turn-block pre { border: 0; padding: 0; background: transparent; }
.turn-block.tool pre { padding: 10px 0 0; }
.tool-arg {
  margin: 10px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.45;
}
.tool-arg-label { color: var(--warn); }