/* Mixing Matters project page.
   Light-only by design: the charts and the paper figures share one surface. */

:root {
  color-scheme: light;

  --surface: #ffffff;
  --surface-alt: #f7f7f4;
  --surface-ink: #12161b;

  --ink: #16181a;
  --ink-soft: #4f5459;
  --ink-mute: #7d8288;
  --rule: #e3e3df;
  --rule-soft: #eeeeea;
  --link: #0f5ea8;

  /* Data series. Okabe-Ito, matching paper/generate_figures.py. */
  --attention: #0072b2;
  --state-space: #e69f00;
  --hybrid: #009e73;
  /* Darkened for text, where the chart orange fails contrast. */
  --state-space-ink: #a05f00;

  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 68ch;
  --wide: 1080px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 94, 168, 0.28);
}

a:hover {
  border-bottom-color: currentColor;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.019em;
  margin: 0;
  font-weight: 650;
}

code,
.num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

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

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(158deg, #0e1218 0%, #1b242e 52%, #232f3a 100%);
  color: #f4f5f6;
  padding: 84px 24px 64px;
  text-align: center;
}

/* Ten faint columns: the ten evidence positions the study sweeps. */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.045) 0 1px,
    transparent 1px 10%
  );
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
}

.hero > * {
  position: relative;
}

.hero-eyebrow {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(244, 245, 246, 0.62);
  margin-bottom: 22px;
}

.hero h1 {
  font-size: clamp(30px, 5.1vw, 50px);
  max-width: 17ch;
  margin: 0 auto;
  color: #fff;
}

.hero h1 .sub {
  display: block;
  font-size: clamp(18px, 2.6vw, 25px);
  font-weight: 450;
  letter-spacing: -0.012em;
  color: rgba(244, 245, 246, 0.82);
  margin-top: 14px;
  max-width: 30ch;
  margin-inline: auto;
}

.byline {
  margin: 30px auto 0;
  font-size: 15px;
  color: rgba(244, 245, 246, 0.78);
  max-width: 46ch;
}

.byline .venue {
  display: block;
  margin-top: 6px;
  color: rgba(244, 245, 246, 0.6);
  font-size: 14px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  justify-content: center;
  margin-top: 30px;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 17px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.07);
  color: #f4f5f6;
  font-size: 14.5px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.links a:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.45);
}

.links svg {
  width: 15px;
  height: 15px;
  flex: none;
}

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.93);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--rule);
  /* The nav itself scrolls, not the list. `justify-content: center` on an
     overflowing flex container makes its leading items unreachable, so the
     list is sized to its content and centred with auto margins instead. */
  overflow-x: auto;
  scrollbar-width: none;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav ul {
  display: flex;
  gap: 24px;
  width: max-content;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

/* Spacing comes from the flex gap, not from link padding, so the label text
   aligns with the section content rather than sitting inset from it. */
.nav a {
  display: block;
  padding: 13px 0;
  font-size: 14px;
  color: var(--ink-soft);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--rule);
}

/* ---------- layout ---------- */

.band {
  padding: 72px 24px;
  border-bottom: 1px solid var(--rule-soft);
}

.band.alt {
  background: var(--surface-alt);
}

.band > * {
  max-width: var(--wide);
  margin-inline: auto;
}

.head {
  text-align: center;
  max-width: var(--measure);
  margin: 0 auto 42px;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 11px;
}

.head h2 {
  font-size: clamp(28px, 3.7vw, 40px);
}

.head p {
  margin: 15px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
}

.prose {
  max-width: var(--measure);
  margin-inline: auto;
}

.prose p {
  margin: 0 0 17px;
}

/* Centred to sit with the section title above it, not with the body copy below. */
.hook {
  margin: 0 0 30px;
  text-align: center;
  font-size: clamp(18.5px, 2.1vw, 22px);
  font-weight: 650;
  line-height: 1.34;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.hook span {
  display: block;
  color: var(--state-space-ink);
}

.prose p:last-child {
  margin-bottom: 0;
}

.note {
  font-size: 14.5px;
  color: var(--ink-soft);
}

.minor {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 14px;
}

/* ---------- diagram key ---------- */

.key {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 0 20px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.key span {
  display: flex;
  align-items: center;
  gap: 9px;
}

.swatch {
  width: 26px;
  height: 15px;
  border-radius: 3px;
  flex: none;
  border: 1.2px solid var(--rule);
}

.swatch.gold {
  background: var(--attention);
  border-color: var(--attention);
}

.swatch.plain {
  background: var(--surface);
}

.swatch.query {
  background: #f0f0ec;
}

/* ---------- rendered formulas ---------- */

.formulas {
  margin-top: 24px;
}

.formula {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-size: 15px;
}

.formula .lhs {
  font-weight: 650;
  min-width: 4.6em;
}

.formula .rel,
.formula .op {
  font-family: var(--mono);
  color: var(--ink-mute);
}

.chip {
  padding: 4px 11px;
  border-radius: 6px;
  font-size: 14px;
  white-space: nowrap;
}

.chip b {
  font-weight: 650;
}

.chip.edge {
  background: rgba(0, 114, 178, 0.13);
  color: #0a4f77;
}

.chip.mid {
  background: rgba(22, 24, 26, 0.07);
  color: var(--ink-soft);
}

math {
  font-size: 15.5px;
}

/* Browsers centre block-level math by default; align it under the plain-language
   line it restates instead. */
.mathline {
  margin: 8px 0 22px 0;
  padding-left: calc(4.6em + 9px);
  text-align: left;
  color: var(--ink-soft);
}

.mathline:last-child {
  margin-bottom: 2px;
}

@media (max-width: 560px) {
  .mathline {
    padding-left: 0;
  }
}

/* ---------- figures ---------- */

.figure {
  /* Drop the UA figure margin without clobbering the auto inline margins that
     `.band > *` uses to centre every section child. */
  margin-block: 0;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 20px 20px 16px;
}

.figure + .figure {
  margin-top: 22px;
}

.figure-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 4px;
}

.figure-head h3 {
  font-size: 16.5px;
  font-weight: 600;
}

h4.sub {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-soft);
}

.figure figcaption {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--rule-soft);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(430px, 1fr));
  gap: 22px;
}

/* Grid items default to min-width:auto, which would let a wide chart push the
   page sideways instead of scrolling inside its own container. */
.grid-2 > * {
  min-width: 0;
}

.chart {
  width: 100%;
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
}

/* The SVG keeps the pixel width it was rendered at, so text never scales; a
   chart wider than its container scrolls instead of shrinking. */
.chart svg {
  display: block;
}

.axis-line,
.grid-line {
  stroke: var(--rule);
  stroke-width: 1;
  shape-rendering: crispEdges;
}

.grid-line {
  stroke: var(--rule-soft);
}

.zero-line {
  stroke: #b9bcbf;
  stroke-width: 1;
  shape-rendering: crispEdges;
}

.tick-text {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.axis-title {
  font-size: 11.5px;
  fill: var(--ink-soft);
  font-family: var(--sans);
}

.series-label {
  font-size: 11.5px;
  font-weight: 600;
  font-family: var(--sans);
  fill: var(--ink-soft);
}

.point-label {
  font-size: 10.5px;
  font-family: var(--mono);
  fill: var(--ink-mute);
}

.row-label {
  font-size: 12px;
  font-family: var(--sans);
  fill: var(--ink-soft);
}

/* Leads the block it heads: larger and darker than the model names under it. */
.group-label {
  font-size: 13.5px;
  font-family: var(--sans);
  font-weight: 650;
  letter-spacing: -0.01em;
  fill: var(--ink);
}

.row-rule {
  stroke: var(--rule-soft);
  stroke-width: 1;
}

/* ---------- legend & controls ---------- */

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 18px;
  margin: 2px 0 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend i {
  width: 20px;
  height: 3px;
  border-radius: 2px;
  flex: none;
  background: currentColor;
}

.legend i.dashed {
  background: repeating-linear-gradient(
    90deg,
    currentColor 0 5px,
    transparent 5px 9px
  );
}

.legend i.mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend i.mark.hollow {
  background: var(--surface);
  box-shadow: inset 0 0 0 2px currentColor;
}

.legend i.faded {
  opacity: 0.28;
}

.toggle {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: 7px;
  overflow: hidden;
  background: var(--surface);
}

.toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 12.5px;
  color: var(--ink-soft);
  padding: 5px 13px;
  cursor: pointer;
}

.toggle button + button {
  border-left: 1px solid var(--rule);
}

.toggle button[aria-pressed="true"] {
  background: var(--ink);
  color: #fff;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.filters button {
  appearance: none;
  font: inherit;
  font-size: 13.5px;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  transition: border-color 0.12s ease, color 0.12s ease;
}

.filters button:hover {
  border-color: #c9c9c4;
  color: var(--ink);
}

.filters button[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

/* ---------- tooltip ---------- */

.tooltip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s ease;
  background: rgba(18, 22, 27, 0.96);
  color: #fff;
  border-radius: 7px;
  padding: 9px 11px;
  font-size: 12.5px;
  line-height: 1.5;
  max-width: 260px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
}

.tooltip[data-open="true"] {
  opacity: 1;
}

.tooltip b {
  display: block;
  font-weight: 600;
  margin-bottom: 3px;
}

.tooltip .row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
}

.tooltip .row i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
  background: currentColor;
}

.tooltip .row .v {
  margin-left: auto;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

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

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

caption {
  text-align: left;
  font-size: 13.5px;
  color: var(--ink-soft);
  padding-bottom: 10px;
}

th,
td {
  text-align: left;
  padding: 9px 14px 9px 0;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

thead th {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-mute);
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

td.n,
th.n {
  text-align: right;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-right: 26px;
}

/* Only the final column sits flush with the table edge. */
tr > *:last-child {
  padding-right: 0;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: -1px;
}

.dot.hollow {
  background: var(--surface) !important;
  box-shadow: inset 0 0 0 2px currentColor;
}

.tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  white-space: nowrap;
}

/* ---------- code ---------- */

pre {
  margin: 0;
  background: #12161b;
  color: #e9eaec;
  border-radius: 10px;
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.65;
}

pre code {
  font-family: var(--mono);
}

pre .c {
  color: #9aa3ac;
}

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .hero {
    padding: 58px 20px 46px;
  }

  .band {
    padding: 54px 20px;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition-duration: 0.01ms !important;
  }
}