/* One stylesheet, no framework, no build step. The page is a static file a stranger can read,
   and its stylesheet should be too.

   The palette, the type and the 3px rule over the page are peterparker.ca's, because this page
   is part of that site even though a separate host serves it. The two fonts are copied into
   this folder rather than linked from there: the page makes no off-origin request, and a font
   is a request. Both are SIL Open Font License; fonts/LICENSE.txt says where they came from. */

@font-face {
  font-family: "Newsreader";
  font-style: normal;
  font-weight: 200 800;
  font-display: swap;
  src: url(fonts/newsreader-latin.woff2) format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url(fonts/inter-latin.woff2) format("woff2");
}

:root {
  color-scheme: light dark;
  --paper: #f5f3ee;
  --paper-soft: #fdfcf9;
  --ink: #16181d;
  --ink-soft: #3c4048;
  --ink-faint: #6b7079;
  --line: #e3dfd6;
  --line-2: #cfc9bd;
  --line-soft: #eeebe4;
  --accent: #0f5c6e;
  --accent-ink: #0b4653;
  --accent-soft: #e4eff1;
  --warn: #c0392b;
  --good: #1e7a4c;
  --sim: #6d3f9e;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  --radius: 10px;
  --shadow: 0 6px 24px -18px rgba(0, 0, 0, 0.35);
  --column: 66rem;
  --measure: 100%;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0e1013;
    --paper-soft: #15181d;
    --ink: #ece9e2;
    --ink-soft: #c9c6bf;
    --ink-faint: #969ba5;
    --line: #262a31;
    --line-2: #363b44;
    --line-soft: #1c2026;
    --accent: #7cc7d6;
    --accent-ink: #a9dde7;
    --accent-soft: #14262b;
    --warn: #f0736a;
    --good: #58c286;
    --sim: #b191e0;
    --shadow: 0 6px 24px -14px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }

html { font-size: 18px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.72;
  border-top: 3px solid var(--accent);
  font-feature-settings: "cv11", "ss01";
}

main {
  max-width: var(--column);
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}

/* ---------------------------------------------------------------- the way back */

.top { border-bottom: 1px solid var(--line); background: var(--paper); }

.top-inner {
  max-width: var(--column);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand:hover { text-decoration: none; color: var(--accent-ink); }

.mono-mark {
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 6px;
  background: var(--accent);
  color: #fdfcf9;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@media (prefers-color-scheme: dark) { .mono-mark { color: #0e1013; } }

.top-nav { font-size: 0.92rem; color: var(--ink-soft); text-align: right; }
.top-nav a { color: var(--ink-soft); }
.top-nav a:hover { color: var(--accent-ink); }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.012em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3rem); line-height: 1.1; margin: 0 0 1rem; }
h2 { font-size: clamp(1.55rem, 2.6vw, 2rem); line-height: 1.2; margin: 0 0 0.7rem; }
h3 { font-size: 1.2rem; line-height: 1.25; margin: 0 0 0.45rem; }
p { margin: 0 0 0.85rem; max-width: var(--measure); }

a { color: var(--accent); text-decoration: none; text-underline-offset: 0.15em; }
a:hover, a:focus-visible { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

code { font-family: var(--mono); font-size: 0.9em; }

/* ---------------------------------------------------------------- hero */

.hero { padding: 3.25rem 0 2.25rem; border-bottom: 1px solid var(--line); }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-faint);
  margin: 0 0 0.6rem;
}

.lead { font-size: 1.05rem; color: var(--ink-soft); max-width: var(--measure); }

.hero-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.9rem;
  margin: 1.75rem 0 1.1rem;
}

.point {
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.point-figure {
  display: block;
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink);
}

.point-unit {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink-soft);
  line-height: 1.35;
}

.point-label {
  display: block;
  margin-top: 0.4rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--ink-faint);
  line-height: 1.4;
}

.hero-note { font-size: 0.88rem; color: var(--ink-faint); margin: 0; max-width: var(--measure); }

/* ---------------------------------------------------------------- sections */

.section { padding: 2.75rem 0; border-bottom: 1px solid var(--line); }
.section-lead { color: var(--ink-soft); max-width: var(--measure); }
.note { font-size: 0.86rem; color: var(--ink-faint); max-width: var(--measure); }

/* ---------------------------------------------------------------- tables */

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }

th, td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

th {
  font-weight: 600;
  color: var(--ink);
  font-size: 0.82rem;
  background: var(--line-soft);
  border-bottom-color: var(--line-2);
}

td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.five-types td:first-child { white-space: nowrap; }
.five-types td:nth-child(2) { white-space: normal; }
.five-types tr.good { background: color-mix(in srgb, var(--good) 11%, transparent); }
.five-types tr.bad { background: color-mix(in srgb, var(--warn) 11%, transparent); }

.log td.right { color: var(--good); font-weight: 600; }
.log td.wrong { color: var(--warn); }
.log tbody tr:last-child { background: var(--accent-soft); }

/* ---------------------------------------------------------------- controls */

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
  padding: 1rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.control { display: flex; flex-direction: column; gap: 0.4rem; min-width: 0; }

label { font-size: 0.85rem; font-weight: 600; color: var(--ink-soft); }

.hint {
  display: block;
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-top: 0.1rem;
}

select, input[type="range"] { width: 100%; font: inherit; accent-color: var(--accent); }

select {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--paper-soft);
  color: var(--ink);
  font-size: 0.9rem;
}

input[type="range"] { height: 1.6rem; }

output { font-variant-numeric: tabular-nums; color: var(--accent-ink); font-weight: 600; }

.button-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }

button {
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--line-2);
  background: var(--paper-soft);
  color: var(--ink);
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

button:hover { border-color: var(--accent); color: var(--accent-ink); }

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper-soft);
}

button.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); color: var(--paper-soft); }

@media (prefers-color-scheme: dark) {
  button.primary, button.primary:hover { color: #0e1013; }
}

/* ---------------------------------------------------------------- the race */

/* Two arenas side by side, because the comparison is the argument. Put one above the other and
   a reader has to remember the first while reading the second, which is exactly the thing a
   benchmark table already asks of them. */
.race {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.25rem 0;
}

.arena {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  background: var(--paper-soft);
  box-shadow: var(--shadow);
  min-width: 0;
}

#arena-random { border-left-color: var(--line-2); }

.arena-head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.arena-head h3 { margin: 0; flex: 1 1 12rem; font-size: 1.1rem; }

/* Which colour is which model. Two curves and no key is a picture of nothing. */
.pair-legend { display: flex; gap: 1rem; flex-wrap: wrap; margin: 0.2rem 0 0; font-size: 0.8rem; }
.pair-key { display: inline-flex; align-items: center; gap: 0.35rem; color: var(--ink-soft); font-family: var(--mono); }
.pair-swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.pair-swatch.first { background: var(--accent); }
.pair-swatch.second { background: var(--sim); }

.arena-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin: 0.7rem 0 0.2rem;
}

.arena-stats .figure {
  display: block;
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  color: var(--ink-soft);
}

.tag-good { background: color-mix(in srgb, var(--good) 15%, transparent); color: var(--good); border-color: transparent; }

/* ---------------------------------------------------------------- charts */

.chart-figure { margin: 1.1rem 0; }
.chart { width: 100%; }
.chart svg, .chart canvas { width: 100%; height: auto; display: block; }
.posteriors { width: 100%; height: auto; display: block; margin-top: 0.3rem; }

figcaption {
  font-size: 0.83rem;
  color: var(--ink-faint);
  margin-top: 0.5rem;
  max-width: var(--measure);
}

.grid { stroke: var(--line); stroke-width: 1; }
.zero { stroke: var(--ink-faint); stroke-width: 1; stroke-dasharray: 2 3; }
.tick { fill: var(--ink-faint); font-size: 11px; }
.axis { fill: var(--ink-soft); font-size: 12px; font-weight: 600; }
.series { fill: none; stroke-linejoin: round; stroke-linecap: round; }
.band { opacity: 0.15; stroke: none; }
.dot { stroke: var(--paper-soft); stroke-width: 2; }
.end-label { font-size: 11px; font-weight: 600; }
.hidden { opacity: 0.08; }
.edge { stroke: var(--warn); stroke-width: 1.5; stroke-dasharray: 2 3; opacity: 0.55; }
.edge-label { fill: var(--warn); font-size: 10px; opacity: 0.8; }
.density-fill { opacity: 0.14; }
.row-label { fill: var(--ink-soft); font-size: 11.5px; font-family: var(--mono); }
.row-value { fill: var(--ink); font-size: 11.5px; font-weight: 600; font-variant-numeric: tabular-nums; }

.legend { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 0.25rem 0 1.1rem; }

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 400;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--paper-soft);
  color: var(--ink-soft);
}

.legend-item:hover { border-color: var(--accent); color: var(--accent-ink); }
.legend-item.on { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); font-weight: 600; }

/* ---------------------------------------------------------------- verdicts */

.verdict {
  margin: 1.1rem 0 0;
  padding: 0.9rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  font-size: 0.95rem;
  max-width: var(--measure);
}

.verdict.good { background: color-mix(in srgb, var(--good) 12%, transparent); border-left-color: var(--good); }
.verdict.warn { background: color-mix(in srgb, var(--warn) 12%, transparent); border-left-color: var(--warn); }

/* ---------------------------------------------------------------- headline stats */

.headline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.9rem;
  margin: 1.25rem 0;
}

.stat {
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.figure {
  display: block;
  font-family: var(--serif);
  font-size: 1.75rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.caption {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.82rem;
  color: var(--ink-faint);
  line-height: 1.4;
}

/* ---------------------------------------------------------------- disclosure */

.disclose {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 1.1rem;
  margin: 1.1rem 0;
  background: var(--paper-soft);
}

.disclose summary {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  cursor: pointer;
  padding: 0.8rem 0 0.8rem 0.25rem;
  font-weight: 600;
  font-size: 0.94rem;
  list-style: none;
}

.disclose summary::-webkit-details-marker { display: none; }

.disclose summary::before {
  content: "\203A";
  flex: none;
  width: 0.6em;
  text-align: center;
  font-size: 1.2em;
  line-height: 1;
  color: var(--ink-faint);
  transform: rotate(90deg);
  transition: transform 0.12s ease;
}

.disclose[open] summary::before { transform: rotate(270deg); }
.disclose summary:hover { color: var(--accent-ink); }
.disclose[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 0.75rem; }
.disclose > *:last-child { margin-bottom: 0.85rem; }

/* ---------------------------------------------------------------- power calculator */

.power-grid {
  display: grid;
  grid-template-columns: minmax(15rem, 4fr) 6fr;
  gap: 1.25rem;
  margin: 1.25rem 0;
  align-items: start;
}

.power-controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1.1rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.power-output {
  padding: 1.1rem 1.25rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-width: 0;
}

.power-floor { padding-bottom: 0.85rem; margin-bottom: 0.85rem; border-bottom: 1px solid var(--line); }
.power-floor .figure { color: var(--accent-ink); font-size: 2rem; }
.power-lead { font-size: 0.92rem; color: var(--ink-soft); }
.power-table td:first-child { white-space: normal; }
.power-note { font-size: 0.82rem; color: var(--ink-faint); margin: 0.75rem 0 0; }

/* ---------------------------------------------------------------- takeaways */

.takeaways { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.1rem; }

.takeaway {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  background: var(--paper-soft);
}

.takeaway p { font-size: 0.9rem; color: var(--ink-soft); }
.takeaway h3 { color: var(--ink); }

/* ---------------------------------------------------------------- footer */

footer { padding: 2.25rem 0 0; }
.footer-lead { font-weight: 600; }
.footer-back { margin-bottom: 1rem; }

/* ---------------------------------------------------------------- narrow screens */

@media (max-width: 58rem) {
  .race { grid-template-columns: 1fr; }
}

@media (max-width: 46rem) {
  .takeaways { grid-template-columns: 1fr; }
  .power-grid { grid-template-columns: 1fr; }
  .top-inner { height: auto; padding: 0.8rem 1.1rem; }
  .hero { padding: 2.25rem 0 1.75rem; }
  .section { padding: 2rem 0; }
  main { padding: 0 1.1rem 3.5rem; }
  .top-nav { display: none; }
  th, td { padding: 0.45rem 0.6rem; }
  .arena-stats { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}