/* PACE project page */
:root {
  --night: #08111f;
  --night-2: #0d1a2e;
  --night-line: rgba(214, 226, 245, 0.14);
  --night-ink: #e9eef6;
  --night-muted: #8b9ab2;

  --paper: #f4f2ec;
  --paper-2: #ebe8df;
  --ink: #0f1d36;
  --ink-2: #33415a;
  --muted: #6a7486;
  --rule: #d9d4c8;
  --navy: #10264a;
  --red: #d1343f;
  --red-bright: #f0525c;
  --bar: #b9bec7;

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Archivo", "Helvetica Neue", Helvetica, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --gutter: clamp(16px, 4vw, 56px);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.55 var(--sans);
  font-stretch: 100%;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }
::selection { background: var(--red); color: #fff; }

.mono { font-family: var(--mono); font-size: 12px; letter-spacing: 0.02em; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  background: radial-gradient(120% 90% at 72% 45%, #0f2140 0%, var(--night) 62%);
  color: var(--night-ink);
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
  isolation: isolate;
}
.hero::after { /* fine grain so the dark field is not flat */
  content: "";
  position: absolute; inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
#flow {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: -1;
  opacity: 0;
  transition: opacity 1.2s ease;
}
#flow.ready { opacity: 1; }

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px var(--gutter);
  position: relative; z-index: 2;
}
.nav .mark { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav .mark img { width: 28px; height: 28px; }
.nav .mark span { font: 700 15px/1 var(--sans); font-stretch: 125%; letter-spacing: 0.08em; }
.nav ul { display: flex; gap: clamp(14px, 2.4vw, 30px); list-style: none; margin: 0; padding: 0; }
.nav ul a {
  font: 500 12px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  text-decoration: none; color: var(--night-muted); transition: color .2s;
}
.nav ul a:hover { color: var(--night-ink); }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(340px, 0.78fr) 1.22fr;
  padding: 0 var(--gutter);
  min-height: 0;
}
.hero-copy {
  align-self: end;
  padding-bottom: clamp(24px, 6vh, 72px);
  max-width: 520px;
  position: relative; z-index: 2;
}
.venue {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--night-muted); margin-bottom: 26px;
}
.venue i { width: 22px; height: 1px; background: var(--red-bright); display: inline-block; }
.hero h1 { margin: 0 0 22px; }
.hero h1 img { width: min(340px, 78%); height: auto; }
.title {
  font: 400 clamp(23px, 2.3vw, 31px)/1.18 var(--serif);
  letter-spacing: -0.01em;
  margin: 0 0 26px;
  color: #f4f6fa;
}
.title em { font-style: italic; color: #ffb3b8; }
.authors { font-size: 15px; line-height: 1.7; color: #c6d0df; margin: 0 0 4px; }
.authors a { text-decoration: none; border-bottom: 1px solid rgba(198, 208, 223, .35); }
.authors a:hover { border-color: var(--red-bright); }
.affil { color: var(--night-muted); margin: 0 0 30px; line-height: 1.7; }

.links { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 16px 10px;
  border: 1px solid var(--night-line);
  font: 500 12px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase;
  text-decoration: none; color: var(--night-ink);
  background: rgba(8, 17, 31, .45);
  backdrop-filter: blur(3px);
  transition: border-color .2s, background .2s, color .2s;
}
.btn:hover { border-color: var(--red-bright); background: rgba(240, 82, 92, .1); }
.btn.primary { background: var(--red); border-color: var(--red); color: #fff; }
.btn.primary:hover { background: var(--red-bright); border-color: var(--red-bright); }
.btn svg { width: 13px; height: 13px; }

.stage { position: relative; min-height: 320px; }

.hud {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 0 var(--gutter) 22px;
  position: relative; z-index: 2;
  color: var(--night-muted);
}
.hud .caption { max-width: 430px; line-height: 1.5; font-size: 11px; }
.hud .caption b { color: var(--night-ink); font-weight: 500; }
.player { display: flex; align-items: center; gap: 14px; flex: 1 1 640px; max-width: 780px; }
.chips { display: flex; gap: 2px; }
.chip {
  font: 500 11px/1 var(--mono); letter-spacing: .04em;
  color: var(--night-muted); background: transparent;
  border: 1px solid transparent; padding: 7px 9px; cursor: pointer;
  transition: color .2s, border-color .2s;
}
.chip:hover { color: var(--night-ink); }
.chip[aria-pressed="true"] { color: var(--night-ink); border-color: var(--night-line); }
.play {
  width: 30px; height: 30px; flex: none;
  border: 1px solid var(--night-line); background: transparent; color: var(--night-ink);
  display: grid; place-items: center; cursor: pointer;
}
.play:hover { border-color: var(--red-bright); }
.track {
  position: relative; flex: 1; height: 30px; cursor: pointer; touch-action: none; min-width: 120px;
}
.track::before { content: ""; position: absolute; left: 0; right: 0; top: 14px; height: 1px; background: var(--night-line); }
.track .fill { position: absolute; left: 0; top: 14px; height: 1px; background: var(--red-bright); width: 0; }
.track .tick { position: absolute; top: 10px; width: 1px; height: 9px; background: rgba(214, 226, 245, .4); }
.track .tick.mid { height: 9px; width: 9px; top: 10px; margin-left: -4px; border: 1px solid rgba(214, 226, 245, .6); border-radius: 50%; background: transparent; }
.track .head { position: absolute; top: 11px; width: 7px; height: 7px; margin-left: -3px; border-radius: 50%; background: #fff; box-shadow: 0 0 12px var(--red-bright); }
.readout { flex: none; text-align: right; color: var(--night-ink); white-space: nowrap; }
.readout small { color: var(--night-muted); font-size: 11px; }

/* ---------- Sections ---------- */
section.block { padding: clamp(72px, 11vw, 140px) var(--gutter); }
.wrap { max-width: var(--max); margin: 0 auto; }
.label {
  font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--red); margin: 0 0 22px; display: flex; align-items: center; gap: 12px;
}
.label::before { content: ""; width: 18px; height: 1px; background: currentColor; }

.lede {
  font: 300 clamp(28px, 3.6vw, 48px)/1.16 var(--serif);
  letter-spacing: -0.015em;
  margin: 0;
  max-width: 21em;
}
.lede em { font-style: italic; color: var(--red); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 96px); margin-top: clamp(48px, 7vw, 88px); }
.split p { margin: 0; color: var(--ink-2); font-size: 17px; max-width: 34em; }
.split h3 { font: 600 13px/1 var(--sans); letter-spacing: .02em; margin: 0 0 12px; color: var(--ink); }

/* Method */
.method { background: var(--paper-2); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--rule); margin-top: 40px; }
.step { position: relative; padding: 28px 28px 32px 0; border-right: 1px solid var(--rule); min-width: 0; }
.step + .step { padding-left: 28px; }
.step:last-child { border-right: 0; }
.step .n { color: var(--muted); transition: color .4s; }
.step::before { content: ""; position: absolute; left: 0; right: 0; top: -1px; height: 2px; background: var(--red); transform: scaleX(0); transform-origin: left; transition: transform .6s cubic-bezier(.2, .7, .2, 1); }
.step.active::before { transform: scaleX(1); }
.step.active .n { color: var(--red); }
.step h3 { font: 600 21px/1.2 var(--sans); font-stretch: 112%; margin: 14px 0 10px; letter-spacing: -0.01em; }
.step p { margin: 0 0 22px; color: var(--ink-2); font-size: 15.5px; }
.eq { overflow-x: auto; overflow-y: hidden; padding: 4px 0; color: var(--navy); font-size: 15px; scrollbar-width: none; }
.eq::-webkit-scrollbar { display: none; }
/* Method overview (drawn by js/overview.js; hidden without JS) */
.overview { display: none; margin: clamp(40px, 5vw, 60px) 0 clamp(36px, 5vw, 56px); }
.js .overview { display: block; }
.ov-tabs { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--rule); }
.ov-tab {
  position: relative; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 14px 12px 10px 0; color: var(--muted); font: 600 15px/1.2 var(--sans); font-stretch: 108%;
  transition: color .3s;
}
.ov-tab .n { display: block; margin-bottom: 6px; font: 500 11px/1 var(--mono); letter-spacing: .08em; }
.ov-tab::before { content: ""; position: absolute; left: 0; right: 12px; top: -1px; height: 2px; background: var(--red); transform: scaleX(var(--p, 0)); transform-origin: left; }
.ov-tab:hover { color: var(--ink-2); }
.ov-tab[aria-selected="true"] { color: var(--ink); }
.ov-tab[aria-selected="true"] .n { color: var(--red); }
.ov-tab:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
#ov { display: block; width: 100%; height: auto; margin: 6px 0 4px; overflow: visible; }
#ov .band { fill: none; stroke: rgba(16, 38, 74, .065); stroke-width: 40; stroke-linecap: round; stroke-linejoin: round; }
#ov .layer { opacity: 0; transition: opacity .7s ease; }
#ov .layer.on { opacity: 1; }
#ov .web { stroke: #8a92a0; stroke-width: .7; stroke-opacity: .16; }
#ov .glyph { fill: rgba(209, 52, 63, .07); stroke: var(--red); stroke-width: 1.4; }
#ov .arrow-ink { stroke: var(--ink); stroke-width: 1.6; }
#ov .arrow-muted { stroke: #8a92a0; stroke-width: 1.4; }
#ov .bridge { fill: none; stroke-width: 1.5; stroke-linecap: round; }
#ov .field { stroke: #8a92a0; stroke-width: 1.1; }
#ov .trail { fill: none; stroke: var(--red); stroke-width: 1.6; stroke-opacity: .55; stroke-linecap: round; }
#ov .head { fill: var(--red); stroke: var(--paper-2); stroke-width: 1.5; }
#ov .cell { stroke: var(--paper-2); stroke-width: 1.5; }
#ov g.dim .cell { opacity: .45; }
#ov text { font-family: var(--mono); font-size: 9.5px; fill: var(--muted); letter-spacing: .02em; }
#ov text.ink { fill: var(--ink); }
#ov text.red { fill: var(--red); }
#ov text.qm { font-family: var(--serif); font-size: 26px; fill: #8a92a0; }
#ov text.tlabel { font-family: var(--serif); font-style: italic; font-size: 17px; fill: var(--ink); }
#ov text.tlabel .sub { font-size: .62em; }
.ov-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 24px; color: var(--muted); min-height: 2.6em; }
.ov-foot #ov-cap { color: var(--ink-2); max-width: 64ch; }
.ov-meta a { color: inherit; }
.ov-meta a:hover { color: var(--red); }

/* Results */
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--ink); margin-top: 8px; }
.stat { padding: 26px 32px 30px 0; }
.stat + .stat { padding-left: 32px; border-left: 1px solid var(--rule); }
.stat .big {
  font: 700 clamp(56px, 8.4vw, 116px)/0.92 var(--sans); font-stretch: 118%;
  letter-spacing: -0.04em; color: var(--ink); display: flex; align-items: flex-start; gap: 4px;
}
.stat .big sup { font-size: .38em; letter-spacing: 0; margin-top: .18em; color: var(--red); }
.stat p { margin: 16px 0 0; color: var(--ink-2); max-width: 26em; font-size: 15.5px; }
.note { margin: 26px 0 0; color: var(--muted); }

.chart-card { margin-top: clamp(56px, 7vw, 88px); }
.chart-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 18px; margin-bottom: 18px; }
.chart-head h3 { font: 600 21px/1.2 var(--sans); font-stretch: 112%; margin: 0; }
.chart-head p { margin: 6px 0 0; color: var(--muted); }
.controls { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin-bottom: 26px; }
.seg { display: flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--rule); background: #fbfaf6; }
.seg button {
  font: 500 12px/1 var(--mono); letter-spacing: .02em;
  border: 0; background: transparent; color: var(--ink-2); padding: 10px 12px; cursor: pointer;
  border-right: 1px solid var(--rule);
}
.seg button:last-child { border-right: 0; }
.seg button:hover { color: var(--ink); background: #f1efe8; }
.seg button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.seg.datasets { overflow-x: auto; flex-wrap: nowrap; max-width: 100%; scrollbar-width: none; }
.seg.datasets::-webkit-scrollbar { display: none; }
.seg.datasets button { white-space: nowrap; }

.bars { position: relative; }
.row {
  position: absolute; left: 0; right: 0; height: 34px;
  display: grid; grid-template-columns: 138px 1fr 74px; align-items: center; gap: 14px;
  transition: top .55s cubic-bezier(.2, .7, .2, 1);
}
.row .name { font-size: 14px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row.ours .name { color: var(--ink); font-weight: 700; }
.row .lane { position: relative; height: 14px; }
.row .lane::before { content: ""; position: absolute; left: 0; top: -13px; bottom: -13px; width: 1px; background: var(--ink); }
.row .bar {
  position: absolute; left: 0; top: 0; height: 14px; border-radius: 0 4px 4px 0;
  background: var(--bar); width: 0; transition: width .6s cubic-bezier(.2, .7, .2, 1), background .2s;
}
.row.ours .bar { background: var(--red); }
.row .bar.clipped { border-radius: 0; -webkit-mask: linear-gradient(90deg, #000 calc(100% - 14px), transparent calc(100% - 14px), transparent calc(100% - 10px), #000 calc(100% - 10px), #000 calc(100% - 6px), transparent calc(100% - 6px)); mask: linear-gradient(90deg, #000 calc(100% - 14px), transparent calc(100% - 14px), transparent calc(100% - 10px), #000 calc(100% - 10px), #000 calc(100% - 6px), transparent calc(100% - 6px)); }
.row .val { font: 500 12.5px/1 var(--mono); color: var(--ink-2); text-align: right; font-variant-numeric: tabular-nums; }
.row.ours .val { color: var(--ink); }
.row.na .val { color: var(--muted); }
.row:hover .bar { background: #9aa1ad; }
.row.ours:hover .bar { background: var(--red-bright); }
.delta { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; margin-top: 22px; color: var(--muted); }
.delta strong { font: 700 22px/1 var(--sans); font-stretch: 112%; color: var(--ink); letter-spacing: -0.01em; }
.delta strong.up { color: var(--muted); }
.tip {
  position: fixed; z-index: 20; pointer-events: none;
  background: var(--ink); color: #fff; padding: 8px 10px;
  font: 500 12px/1.45 var(--mono); white-space: nowrap;
  opacity: 0; transform: translate(-50%, calc(-100% - 10px)); transition: opacity .12s;
}
.tip.on { opacity: 1; }
.tip span { color: #aab6c8; }

/* Cite */
.cite { background: var(--night); color: var(--night-ink); }
.cite .label { color: var(--red-bright); }
.bib {
  position: relative; margin-top: 8px; border: 1px solid var(--night-line); background: var(--night-2);
}
.bib pre {
  margin: 0; padding: 26px 28px; overflow-x: auto;
  font: 400 13px/1.7 var(--mono); color: #c9d3e2;
}
.bib pre .k { color: #ff8b93; }
.bib pre .f { color: #8fb3e8; }
.copy {
  position: absolute; top: 12px; right: 12px;
  font: 500 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase;
  color: var(--night-ink); background: transparent; border: 1px solid var(--night-line);
  padding: 8px 10px; cursor: pointer;
}
.copy:hover { border-color: var(--red-bright); }
footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px;
  padding: 28px var(--gutter) 40px;
  background: var(--night); color: var(--night-muted);
  border-top: 1px solid var(--night-line);
}
footer a { color: var(--night-ink); text-decoration: none; }
footer a:hover { color: #fff; }
.thanks { margin: clamp(40px, 6vw, 64px) 0 0; color: var(--night-muted); font-size: 14px; max-width: 46em; line-height: 1.6; }

/* Reveal */
/* Hidden only when JS is running, so content stays visible without it. */
.js .reveal { transition: opacity .9s ease, transform .9s cubic-bezier(.2, .7, .2, 1); }
.js .reveal:not(.in) { opacity: 0; transform: translateY(18px); }
.hero-copy > * { animation: rise 1s cubic-bezier(.2, .7, .2, 1) both; }
.hero-copy > *:nth-child(2) { animation-delay: .08s; }
.hero-copy > *:nth-child(3) { animation-delay: .16s; }
.hero-copy > *:nth-child(4) { animation-delay: .24s; }
.hero-copy > *:nth-child(5) { animation-delay: .3s; }
.hero-copy > *:nth-child(6) { animation-delay: .36s; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

@media (prefers-reduced-motion: reduce) {
  .js .reveal, .js .reveal:not(.in), .hero-copy > * { opacity: 1; transform: none; animation: none; transition: none; }
  .row, .row .bar { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; grid-template-rows: auto auto; }
  .stage { order: -1; min-height: 0; aspect-ratio: 1 / 0.86; max-height: 56svh; }
  .hero-copy { align-self: start; padding-top: 8px; max-width: 640px; }
  .hud { flex-direction: column-reverse; align-items: stretch; gap: 14px; }
  .hud .caption { max-width: none; }
  .player { flex: 1 1 auto; flex-wrap: wrap; }
  .steps { grid-template-columns: 1fr; }
  .step, .step + .step { padding: 26px 0 30px; border-right: 0; border-bottom: 1px solid var(--rule); }
  .step:last-child { border-bottom: 0; }
  .split { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .ov-tab { font-size: 13px; padding-right: 6px; }
  .ov-tab::before { right: 6px; }
  #ov .minor { display: none; }
  #ov text { font-size: 22px; }
  #ov text.tlabel { font-size: 32px; }
  #ov text.qm { font-size: 44px; }
  body { font-size: 16px; }
  .nav ul li.hide-sm { display: none; }
  .stats { grid-template-columns: 1fr; }
  .stat, .stat + .stat { padding: 24px 0 26px; border-left: 0; }
  .stat + .stat { border-top: 1px solid var(--rule); }
  .row { grid-template-columns: 96px 1fr 58px; gap: 10px; }
  .row .name { font-size: 12.5px; }
  .row .val { font-size: 11.5px; }
  .chips { order: 3; width: 100%; justify-content: space-between; }
  .seg.datasets { -webkit-mask: linear-gradient(90deg, #000 82%, transparent); mask: linear-gradient(90deg, #000 82%, transparent); }
  .bib pre { font-size: 11.5px; padding: 22px 18px; }
}

@media print {
  .js .reveal:not(.in) { opacity: 1; transform: none; }
  #flow, .hud { display: none; }
}