@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --ink: #15141c;
  --ink-soft: #514f5e;
  --paper: #faf9fc;
  --paper-raised: #ffffff;
  --line: #e6e3ee;
  --pink: #e10098;
  --pink-deep: #8a0a5b;
  --pink-pale: #fde6f3;
  --violet: #6a3df5;
  --gold: #f6b93b;
  --ok: #1f9d6b;
  --radius: 10px;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --sans: 'Inter', system-ui, sans-serif;
  --display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}

section { scroll-margin-top: 72px; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid rgba(106, 61, 245, 0.35);
  outline-offset: 3px;
}

.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 28px;
}

a { color: var(--pink-deep); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 249, 252, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.nav.scrolled { border-color: var(--line); }
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
}
.brand .dot { color: var(--pink); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
}
.nav-links a:hover { color: var(--pink-deep); }
.nav-cta {
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 7px 16px !important;
  color: var(--ink) !important;
}
.nav-cta:hover { background: var(--ink); color: #fff !important; }

/* Hosted toolkit: a CTA, but dashed to read as work in progress. */
.nav-cta-wip {
  border-style: dashed;
  border-color: var(--pink-deep);
  color: var(--pink-deep) !important;
}
.nav-cta-wip:hover { background: var(--pink-deep); border-style: solid; color: #fff !important; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 76px 0 56px;
  border-bottom: 1px solid var(--line);
}
.hero-graph {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.9;
}
.hero .wrap { position: relative; z-index: 1; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--pink-deep);
  background: var(--pink-pale);
  border-radius: 999px;
  padding: 5px 12px;
  margin-bottom: 22px;
  font-weight: 600;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.05;
  margin: 0 0 18px;
  max-width: 780px;
  letter-spacing: -0.01em;
}
.hero h1 .hl { color: var(--pink); }
.hero p.lede {
  font-size: 1.12rem;
  color: var(--ink-soft);
  max-width: 620px;
  margin: 0 0 30px;
}
.hero-compact { padding: 58px 0 42px; }
.hero-compact h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); max-width: 940px; margin-bottom: 18px; }
.hero-compact .lede { font-size: 1.08rem; margin-bottom: 24px; max-width: 720px; }
.hero-compact .hero-actions { margin-bottom: 34px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 44px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 12px 20px;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--pink-deep); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat {
  background: var(--paper-raised);
  padding: 18px 20px;
}
.stat .n {
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
}
.stat .n span { color: var(--pink); }
.stat .l { font-size: 0.8rem; color: var(--ink-soft); margin-top: 2px; }

.stat-row.compact .stat { padding: 12px 18px; }
.stat-row.compact .n { font-size: 1.3rem; }

@media (max-width: 720px) {
  .stat-row { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Section shell ---------- */
section { padding: 68px 0; border-bottom: 1px solid var(--line); }
.section-head { max-width: 680px; margin-bottom: 36px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pink-deep);
  margin-bottom: 10px;
}
.section-head h2 {
  font-family: var(--display);
  font-size: 1.9rem;
  margin: 0 0 12px;
}
.section-head p { color: var(--ink-soft); margin: 0; }
.section-head.slim { margin-bottom: 22px; }
.section-head h3 { font-family: var(--display); font-size: 1.5rem; margin: 0 0 10px; }

.section-secondary { padding: 44px 0; }
.section-secondary .eyebrow { color: var(--ink-soft); }
.section-secondary p { font-size: 0.94rem; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}
.about-grid p { color: var(--ink-soft); }
.about-grid p a { color: var(--pink-deep); font-weight: 600; }
.diff-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.diff-list li {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 0.92rem;
}
.diff-list b { color: var(--ink); }
.diff-list span { color: var(--ink-soft); }
.about-more { display: grid; gap: 12px; margin-top: 28px; }
.about-disclosure {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.about-disclosure summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}
.about-disclosure summary::-webkit-details-marker { display: none; }
.about-disclosure summary b { display: block; color: var(--ink); font-size: 0.94rem; }
.about-disclosure summary small { display: block; color: var(--ink-soft); font-size: 0.8rem; margin-top: 2px; }
.about-disclosure summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--pink-deep);
  font-family: var(--mono);
  font-size: 1.2rem;
}
.about-disclosure[open] summary::after { content: "−"; }
.about-disclosure[open] summary { border-bottom: 1px solid var(--line); }
.disclosure-body { padding: 18px; }
.context-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 28px;
}
.context-body p { margin: 0; color: var(--ink-soft); }
.context-body a, .research-list a { color: var(--pink-deep); font-weight: 600; }
.reference-links { display: grid; gap: 8px; min-width: 190px; }
.reference-links a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--ink-soft);
  font-size: 0.8rem;
  text-align: center;
  text-decoration: none;
}
.reference-links a:hover { border-color: var(--pink); color: var(--pink-deep); }
.research-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}
.research-list li { padding: 16px; border-top: 1px solid var(--line); }
.research-list li:nth-child(-n + 2) { border-top: none; }
.research-list li:nth-child(odd) { border-right: 1px solid var(--line); }
.research-year {
  display: block;
  margin-bottom: 5px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.research-list a { font-size: 0.88rem; line-height: 1.35; text-decoration: none; }
.research-list a:hover { text-decoration: underline; }
.research-list p { margin: 7px 0 0; color: var(--ink-soft); font-size: 0.8rem; line-height: 1.45; }
.research-current { background: var(--pink-pale); }
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .context-body { grid-template-columns: 1fr; gap: 16px; }
  .reference-links { display: flex; flex-wrap: wrap; min-width: 0; }
  .research-list { grid-template-columns: 1fr; }
  .research-list li, .research-list li:nth-child(-n + 2) { border-top: 1px solid var(--line); }
  .research-list li:first-child { border-top: none; }
  .research-list li:nth-child(odd) { border-right: none; }
}

/* ---------- Task example ---------- */
.pipeline {
  display: grid;
  grid-template-columns: 1.1fr 40px 0.9fr 40px 1.1fr;
  gap: 0;
  align-items: stretch;
}
.pipeline-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pink);
  font-size: 1.3rem;
}
.panel {
  background: #14131c;
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.panel.light { background: var(--paper-raised); border: 1px solid var(--line); }
.panel-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 10px 14px;
  color: #b9b6c9;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.panel.light .panel-label { color: var(--ink-soft); border-bottom-color: var(--line); }
.panel pre {
  margin: 0;
  padding: 16px 14px;
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.6;
  color: #e7e5f0;
  overflow: auto;
  flex: 1;
}
.panel.light .nl-text {
  padding: 16px 14px;
  font-size: 0.94rem;
  color: var(--ink);
  font-style: italic;
}
@media (max-width: 980px) {
  .pipeline { grid-template-columns: 1fr; gap: 14px; }
  .pipeline-arrow { transform: rotate(90deg); padding: 4px 0; }
}

/* ---------- Leaderboard ---------- */
.board-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 20px;
}
.tabs { display: inline-flex; background: var(--line); border-radius: 999px; padding: 4px; }
.tab, .size-tab {
  border: none;
  background: transparent;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--ink-soft);
}
.tab.active, .size-tab.active { background: var(--paper-raised); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,0.08); }
.detail-toggle {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
}
.detail-toggle:hover { border-color: var(--pink); color: var(--pink-deep); }

.matrix-legend { display: none; align-items: center; gap: 10px; font-size: 0.8rem; color: var(--ink-soft); margin-bottom: 14px; }
.legend-scale { display: flex; height: 10px; width: 120px; border-radius: 4px; overflow: hidden; }
.legend-scale span { flex: 1; }

.matrix-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.matrix { width: 100%; border-collapse: collapse; font-size: 0.86rem; min-width: 920px; }
table.matrix th, table.matrix td { padding: 12px 14px; text-align: right; white-space: nowrap; }
table.matrix th:first-child, table.matrix td:first-child { text-align: left; white-space: normal; }
table.matrix thead th {
  background: var(--paper-raised);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  position: sticky;
  top: 0;
}
table.matrix thead th:hover { color: var(--pink-deep); }
table.matrix thead th.sorted { color: var(--pink-deep); }
table.matrix thead th .arrow { font-size: 0.65em; margin-left: 3px; }
table.matrix tbody tr { border-bottom: 1px solid var(--line); }
table.matrix tbody tr:last-child { border-bottom: none; }
table.matrix td.model-cell { display: flex; flex-direction: column; gap: 4px; }
table.matrix .model-name { font-weight: 700; color: var(--ink); }
table.matrix .model-setting { font-size: 0.76rem; color: var(--ink-soft); font-family: var(--mono); display: flex; align-items: center; gap: 8px; }
table.matrix td.params-cell { color: var(--ink-soft); font-family: var(--mono); font-size: 0.82rem; }
table.matrix td.overall {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  background: #f3f1f8;
  border-left: 2px solid var(--line);
  border-right: 2px solid var(--line);
}
table.matrix td.overall .pct { font-size: 0.72rem; color: var(--ink-soft); font-weight: 500; margin-left: 1px; }
table.matrix td.cell { color: var(--ink); font-family: var(--mono); font-size: 0.82rem; }
.badge-weight {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.66rem;
  border-radius: 999px;
  padding: 1px 8px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.badge-weight.open { color: var(--ok); border: 1px solid var(--ok); }
.badge-weight.closed { color: var(--violet); border: 1px solid var(--violet); }
.matrix-footnote { font-size: 0.8rem; color: var(--ink-soft); margin-top: 12px; }

/* ---------- Compare (radar) ---------- */
.compare-shell {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
}
.model-picker { display: flex; flex-direction: column; gap: 8px; }
.pick-item {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  background: var(--paper-raised);
  cursor: pointer;
  font-size: 0.86rem;
}
.pick-item input { accent-color: var(--pink); }
.pick-item .swatch { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.pick-item .name { font-weight: 600; }
.pick-item .sub { color: var(--ink-soft); font-size: 0.78rem; }
.pick-item.disabled { opacity: 0.4; cursor: not-allowed; }
.radar-panel {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.radar-legend { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; font-size: 0.82rem; }
.radar-legend .item { display: flex; align-items: center; gap: 6px; }
.radar-legend .swatch { width: 10px; height: 10px; border-radius: 50%; }
.pick-hint { font-size: 0.78rem; color: var(--ink-soft); margin-top: 8px; }
@media (max-width: 860px) { .compare-shell { grid-template-columns: 1fr; } }

/* ---------- Dataset ---------- */
.dataset-featured {
  background: linear-gradient(180deg, #fff 0%, var(--paper) 100%);
}
.dataset-featured .eyebrow { color: var(--pink-deep); }
.dataset-featured > .wrap:first-child > .section-head { max-width: 780px; }
.dataset-featured .download-panel { border-top: 3px solid var(--pink); }
.dataset-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.split-cards { display: grid; gap: 10px; margin-bottom: 28px; }
.split-card {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  background: var(--paper-raised);
}
.split-card .n { font-family: var(--display); font-weight: 700; font-size: 1.2rem; }
.split-card .note { font-size: 0.76rem; color: var(--ink-soft); }
.bars { display: grid; gap: 10px; }
.bar-row { display: grid; grid-template-columns: 160px 1fr 104px; align-items: center; gap: 10px; font-size: 0.82rem; }
.bar-track { height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--violet), var(--pink)); border-radius: 4px; }
.bar-row .val { text-align: right; color: var(--ink-soft); font-family: var(--mono); font-size: 0.78rem; }
@media (max-width: 860px) { .dataset-grid { grid-template-columns: 1fr; } }

/* ---------- Dataset download panel ---------- */
.download-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  padding: 6px 20px;
  margin-bottom: 32px;
}
.download-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.download-row:last-of-type { border-bottom: none; }
.dl-name { font-weight: 600; font-size: 0.92rem; }
.dl-meta { font-size: 0.8rem; color: var(--ink-soft); margin-top: 2px; }
.dl-badge {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 7px 14px;
  text-decoration: none;
  white-space: nowrap;
}
.dl-badge.pending { color: var(--ink-soft); background: var(--line); }
.dl-badge.ready { color: #fff; background: var(--pink); }
.dl-badge.ready:hover { background: var(--pink-deep); }

.fine-print { font-size: 0.82rem; color: var(--ink-soft); margin: 0; }

/* ---------- Cite ---------- */
.cite-box {
  background: #14131c;
  color: #e7e5f0;
  border-radius: var(--radius);
  padding: 20px;
  font-family: var(--mono);
  font-size: 0.8rem;
  overflow-x: auto;
}
.cite-box pre { margin: 0; font: inherit; white-space: pre-wrap; }
.cite-note { font-size: 0.86rem; color: var(--ink-soft); margin-top: 14px; }

/* ---------- Footer ---------- */
footer { padding: 40px 0; }
footer .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
footer .f-links { display: flex; gap: 20px; }
footer .f-links a { font-size: 0.84rem; color: var(--ink-soft); text-decoration: none; }
footer .f-links a:hover { color: var(--pink-deep); }
.foot-note { font-size: 0.8rem; color: var(--ink-soft); }

@media (max-width: 900px) {
  .nav-links { gap: 10px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .nav-cta { padding: 6px 12px !important; }
}

@media (max-width: 620px) {
  .wrap { padding: 0 18px; }
  .nav-links .nav-cta:last-child { display: none; }
  .hero-compact { padding: 42px 0 30px; }
  .hero-compact h1 { font-size: clamp(2.35rem, 13vw, 3.4rem); }
  section { padding: 50px 0; }
  .bar-row { grid-template-columns: 116px 1fr 94px; font-size: 0.74rem; }
  .radar-panel { overflow: hidden; }
  .radar-panel svg { max-width: 100%; height: auto; }
}

/* ---------------------------------------------------------------------------
   Contributors
   --------------------------------------------------------------------------- */
.people-block { margin-bottom: 30px; }
.people-block:last-child { margin-bottom: 0; }

.people-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}

.people-intro {
  max-width: 62ch;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0 0 24px;
}

.people-grid {
  display: grid;
  /* 248px fits the longest address (renuka.sindhgatta.rajan@ibm.com, 31 chars
     at 0.72rem mono ~= 215px) plus the card's 30px horizontal padding, so an
     email renders on one line instead of wrapping. */
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: 14px;
}

.person {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 13px 15px;
}

.p-name { font-weight: 600; font-size: 0.93rem; margin-bottom: 2px; }
.p-aff { font-size: 0.8rem; color: var(--ink-soft); }

.p-mail {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--pink-deep);
  text-decoration: none;
  margin-top: 6px;
  /* Only break as a last resort: the grid is sized so a full address fits on
     one line, and `anywhere` was splitting addresses mid-word even when the
     card had room. */
  overflow-wrap: normal;
  word-break: break-word;
}
.p-mail:hover { text-decoration: underline; }
.p-mail-none { color: var(--ink-soft); font-style: italic; }

.p-papers {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  line-height: 1.5;
}

/* "work in progress" tag on a download row name */
.dl-wip {
  display: inline-block;
  margin-left: 7px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--pink-pale);
  color: var(--pink-deep);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  vertical-align: 1px;
}