:root {
  /* The browser page's palette and type, so the pages read as one site.
     Solver colours come from the evaluation manifests. */
  color-scheme: light dark;
  --bg: #f3f5f8;
  --card: #ffffff;
  --line: #dce2ea;
  --ink: #1b2430;
  --muted: #5d6877;
  --accent: #2774ae;
  --accent-fill: #dcebf7;
  --bad: #b3261e;
  --code: #f6f8fa;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d;
    --card: #1b2027;
    --line: #2d343d;
    --ink: #e4e8ec;
    --muted: #9aa3ad;
    --accent: #6cb0e8;
    --accent-fill: #1c3347;
    --bad: #f28b82;
    --code: #151a20;
  }
}

* { box-sizing: border-box; }

/* The browser's `display: none` for the `hidden` attribute is a user-agent
   rule, which any rule here setting `display` overrides. */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
}

main {
  max-width: 84rem;
  margin: 0 auto;
  padding: 1.5rem 2rem 4rem;
}

@media (max-width: 40rem) {
  main { padding: 1rem 1rem 3rem; }
}

header { margin-bottom: 1.25rem; max-width: 60rem; }

.logo { display: block; width: auto; height: 3.5rem; max-width: 100%; }

h1 { margin: 0.6rem 0 0.4rem; font-size: 1.5rem; font-weight: 600; }

h2 { margin: 0 0 0.3rem; font-size: 1rem; font-weight: 600; }

.lede { margin: 0; color: var(--muted); }

a { color: var(--accent); }

.note { margin: 0 0 0.8rem; font-size: 13px; color: var(--muted); }

.error {
  margin: 0 0 1.25rem;
  padding: 0.6rem 0.8rem;
  border-left: 4px solid var(--bad);
  background: var(--card);
  color: var(--bad);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.card {
  min-width: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem;
  margin-bottom: 1.25rem;
}

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

.choice, .pair-choice, .filters {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.6rem 1rem;
}

.choice { margin-bottom: 1.25rem; }
.choice .note, .pair-choice { margin-bottom: 0.4rem; }
.filters { margin-bottom: 0.6rem; }

.field { min-width: 10rem; }
.filters .field { flex: 1 1 12rem; max-width: 20rem; }

label {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
}

select, input {
  width: 100%;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.4rem 0.55rem;
  font: 14px/1.4 var(--sans);
}

select:focus, input:focus, button:focus-visible, svg:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* A solver's colour, beside its name. */
.key {
  display: inline-block;
  width: 0.9rem;
  height: 3px;
  margin-right: 0.4rem;
  border-radius: 2px;
  vertical-align: middle;
}

.toggles { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.6rem; }

.toggle {
  padding: 0.25rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  font: 13px/1.4 var(--sans);
  cursor: pointer;
}

.toggle .count { margin-left: 0.45rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.toggle[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-fill); }
.toggle[aria-pressed="false"] { color: var(--muted); text-decoration: line-through; }
.toggle[aria-pressed="false"] .key { opacity: 0.35; }

.counts { margin: 0.4rem 0 0.6rem; padding: 0; list-style: none; font-size: 14px; }

/* --------------------------------------------------------------- plots */

/* The two plots side by side once there is room for both. */
@media (min-width: 64rem) {
  .charts { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 1.25rem; }
}

.plot { position: relative; }

.plot svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  font: 12px var(--sans);
  touch-action: pan-y;
}

.plot .grid { stroke: var(--line); }
.plot .axis { stroke: var(--muted); fill: none; }
.plot .tick, .plot .band-label { fill: var(--muted); }
.plot .band-label { font-size: 11px; }
.plot .axis-title, .plot .region { fill: var(--ink); font-size: 13px; }
.plot .curve { fill: none; stroke-width: 1.75; stroke-linejoin: round; stroke-linecap: round; }
.plot .curve.ours { stroke-width: 3; }
.plot .band { fill: var(--muted); opacity: 0.1; }
.plot .diagonal { stroke: var(--muted); stroke-dasharray: 4 4; }
.plot .dot { stroke: var(--card); stroke-width: 1; fill-opacity: 0.85; }
.plot .ring { fill: none; stroke-width: 2; pointer-events: none; }

.tip {
  position: absolute;
  z-index: 1;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--card);
  box-shadow: 0 2px 8px rgb(0 0 0 / 0.15);
  font-size: 13px;
  white-space: nowrap;
  pointer-events: none;
}

.tip > * { display: block; }
.tip strong { font-weight: 600; }

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

.scroll { overflow: auto; }
/* Positioned, so the hidden words in its cells stay inside its scroll. */
.table-box { position: relative; max-height: 36rem; border: 1px solid var(--line); border-radius: 6px; }

table.numbers {
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.numbers th, .numbers td {
  padding: 0.3rem 0.7rem;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}

.numbers th { font-weight: 500; }
.numbers thead th { color: var(--muted); font-size: 13px; }
.numbers th[scope="row"], .numbers th:first-child, .numbers .set { text-align: left; }
.numbers thead th.group { text-align: center; color: var(--ink); }
.numbers .picked { background: var(--code); }
.numbers .best { font-weight: 700; }

/* The instance table keeps its header and its first column in view. */
.table-box table { width: 100%; }
.table-box thead th { position: sticky; top: 0; z-index: 1; background: var(--card); }
.table-box tbody th { position: sticky; left: 0; background: var(--card); font: 13px var(--mono); }
.table-box thead th:first-child { left: 0; z-index: 2; }
.table-box td.set { color: var(--muted); }
.table-box td.none { color: var(--muted); }
.table-box td.fastest { font-weight: 700; background: var(--accent-fill); }

.sort {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.sort .arrow { display: inline-block; width: 1em; font-size: 10px; }