/* ============================================================
   Reset & base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #fafaf7;
  --paper:       #ffffff;
  --ink:         #1a1a1a;
  --ink-soft:    #3d3d3a;
  --muted:       #6b6b66;
  --rule:        #e6e3da;
  --rule-soft:   #efece4;
  --accent:      #76b900;       /* NVIDIA green, used sparingly */
  --accent-ink:  #2f4a00;
  --highlight:   #fffbe6;
  --max:         880px;
  --max-wide:    1240px;
  --serif:       'Source Serif 4', 'Source Serif Pro', Charter, 'Iowan Old Style', 'Apple Garamond', Baskerville, Georgia, serif;
  --sans:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:        'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

html { font-size: 18px; }
body {
  font-family: var(--serif);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.62;
  font-feature-settings: "kern", "liga", "onum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ============================================================
   Containers
   ============================================================ */
.col      { max-width: var(--max);      margin: 0 auto; padding: 0 1.5rem; }
.col-wide { max-width: var(--max-wide); margin: 0 auto; padding: 0 1.5rem; }

/* ============================================================
   Header / hero
   ============================================================ */
.hero {
  padding: 5rem 0 3.5rem;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.hero .col { text-align: center; }
.eyebrow {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.25rem;
}
.eyebrow .dot { color: var(--accent); }

h1.title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.9rem, 3.2vw + 0.4rem, 2.85rem);
  line-height: 1.12;
  letter-spacing: -0.018em;
  color: var(--ink);
  margin-bottom: 0.4rem;
}
h1.title em {
  font-style: italic;
  font-weight: 400;
  color: var(--ink-soft);
}
.subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

/* Authors */
.authors {
  font-family: var(--serif);
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto 0.4rem;
}
.authors .author { white-space: nowrap; }
.authors a {
  color: inherit;
  text-decoration: none;
}
.authors a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 0.5px;
  text-underline-offset: 2px;
}
.authors sup { font-size: 0.7em; vertical-align: super; color: var(--muted); margin-left: 1px; }
.affiliations {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0.6rem auto 2.25rem;
  line-height: 1.6;
}
.affiliations sup { margin-right: 2px; }

/* Action buttons */
.actions {
  display: flex; justify-content: center; gap: 0.55rem; flex-wrap: wrap;
}
.btn {
  font-family: var(--sans);
  font-size: 0.83rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 0.45rem 1rem 0.5rem;
  border-radius: 999px;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 0.45rem;
  transition: all 0.15s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn .ic { width: 14px; height: 14px; stroke-width: 1.7; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }

/* ============================================================
   Sections
   ============================================================ */
section { padding: 4rem 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }

.section-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.75rem;
  letter-spacing: -0.012em;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 1.4rem;
}
h2 em { font-style: italic; color: var(--ink-soft); font-weight: 400; }

h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.12rem;
  line-height: 1.3;
  color: var(--ink);
  margin: 2rem 0 0.6rem;
  letter-spacing: -0.005em;
}
h4 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 1.6rem 0 0.55rem;
}

p {
  font-size: 1rem;
  line-height: 1.72;
  color: var(--ink-soft);
  margin-bottom: 1.1rem;
}
p strong { color: var(--ink); font-weight: 600; }
p em { font-style: italic; }

a { color: var(--accent-ink); text-decoration: underline; text-decoration-thickness: 0.5px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 1.2px; }

ul { padding-left: 1.25rem; margin: 0.5rem 0 1.2rem; }
li { font-size: 1rem; line-height: 1.7; color: var(--ink-soft); margin-bottom: 0.4rem; padding-left: 0.25rem; }
li::marker { color: var(--muted); }

code, .code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--rule-soft);
  padding: 0.08em 0.35em;
  border-radius: 3px;
  color: var(--ink);
}

/* TL;DR pullquote */
.tldr {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.18rem;
  line-height: 1.55;
  color: var(--ink);
  border-left: 2px solid var(--accent);
  padding: 0.2rem 0 0.2rem 1.5rem;
  margin: 0 auto 1.5rem;
}

/* Highlighted contribution callouts */
.contribs {
  list-style: none; padding-left: 0;
  display: grid; gap: 1.1rem;
  margin: 1.2rem 0 0;
}
.contribs li {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 1.1rem 1.25rem 1.1rem 1.35rem;
  border-left: 2px solid var(--accent);
  margin: 0;
  font-size: 0.97rem;
}
.contribs li strong { display: block; font-family: var(--serif); font-weight: 600; color: var(--ink); margin-bottom: 0.25rem; font-size: 1.02rem; }

/* Figures */
figure {
  margin: 2rem -0.5rem;
  text-align: center;
}
figure img, figure object {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}
figure.bleed { margin-left: calc(-1 * (100vw - var(--max)) / 2 + 1.5rem); margin-right: calc(-1 * (100vw - var(--max)) / 2 + 1.5rem); }
@media (max-width: 900px) { figure.bleed { margin-left: -0.5rem; margin-right: -0.5rem; } }

/* Standalone hero figure — sized to sit comfortably inside the body column */
.fig-hero {
  margin: 2.25rem auto 1.5rem;
  text-align: center;
}
.fig-hero img,
.fig-hero > object {
  width: 100%;
  max-width: 620px;
  height: auto;
  display: block;
  margin: 0 auto;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--paper);
  padding: 0.6rem;
}
.fig-hero > object img {
  width: 100%;
  height: auto;
  display: block;
  border: 0;
  padding: 0;
  background: transparent;
}
.fig-hero figcaption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0.9rem auto 0;
  max-width: 620px;
  text-align: center;
  padding: 0 1rem;
}
.fig-hero figcaption strong { font-style: normal; color: var(--ink-soft); }

/* Two-up figure (side-by-side panels) */
.fig-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  align-items: end;
  margin: 2rem 0 1rem;
}
.fig-two .panel { display: flex; flex-direction: column; align-items: stretch; }
.fig-two .panel img { width: 100%; height: auto; display: block; border: 1px solid var(--rule); border-radius: 4px; background: var(--paper); padding: 0.5rem; }
.fig-two .panel .panel-cap {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--muted);
  margin-top: 0.65rem;
  text-align: center;
}
.fig-two .panel .panel-cap strong { font-style: normal; color: var(--ink-soft); }
@media (max-width: 820px) { .fig-two { grid-template-columns: 1fr; gap: 2rem; } }
figcaption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0.9rem auto 0;
  max-width: 600px;
  text-align: center;
  padding: 0 0.5rem;
}
figcaption strong { font-style: normal; color: var(--ink-soft); }

/* Insight blocks */
.insight {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.3rem 1.5rem 1.1rem;
  margin: 1.5rem 0;
}
.insight .tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: #eef5d9;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-bottom: 0.6rem;
}
.insight h3 { margin-top: 0; }
.insight p:last-child { margin-bottom: 0; }

/* Dynamics — 2-column layout: pill list (left) + detail card (right) */
.dyn-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(0, 1.25fr);
  gap: 2.2rem;
  margin: 1.75rem 0 0.4rem;
  align-items: start;
}
@media (max-width: 760px) {
  .dyn-layout { grid-template-columns: 1fr; gap: 1.4rem; }
}

.dyn-board {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}
.dyn-group { display: flex; flex-direction: column; gap: 0.45rem; }
.dyn-label {
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.dyn-row { display: flex; flex-wrap: wrap; gap: 0.32rem; }

.dyn-pill {
  font-family: var(--serif);
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.28rem 0.7rem 0.32rem 0.78rem;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s, transform 0.15s;
}
.dyn-pill:hover,
.dyn-pill:focus-visible {
  border-color: var(--ink);
  outline: none;
  transform: translateY(-1px);
}
.dyn-pill[data-track="perception"]  { border-left: 3px solid #b4c97c; }
.dyn-pill[data-track="generation"]  { border-left: 3px solid #7faecf; }
.dyn-pill.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.dyn-pill.active .dyn-chan { color: rgba(255,255,255,0.65); }
.dyn-chan {
  font-family: var(--sans);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
  white-space: nowrap;
}

.dyn-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 0.4rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--rule);
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--muted);
}
.dyn-legend-key { display: inline-flex; align-items: center; gap: 0.35rem; }
.dyn-chan-mini {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.1rem; height: 1.1rem;
  border-radius: 50%;
  background: var(--rule-soft);
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--ink);
}

/* Detail card (right column) */
.dyn-detail {
  font-family: var(--serif);
  font-size: 0.97rem;
  line-height: 1.65;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.3rem 1.5rem 1.35rem;
  position: sticky;
  top: 1.5rem;
}
.dyn-detail-track {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: #eef5d9;
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  margin-bottom: 0.8rem;
}
.dyn-detail-track.t-generation { color: #214c70; background: #dceaf4; }
.dyn-detail-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.18rem;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin-bottom: 0.5rem;
  line-height: 1.25;
}
.dyn-detail-def {
  font-family: var(--serif);
  font-size: 0.97rem;
  line-height: 1.62;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}
.dyn-field {
  border-top: 1px solid var(--rule-soft);
  padding-top: 0.7rem;
  margin-top: 0.7rem;
}
.dyn-field-label {
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.3rem;
}
.dyn-field-body {
  font-family: var(--serif);
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--ink-soft);
}
.dyn-field-body em { color: var(--ink-soft); font-style: italic; }

/* Two-column comparison */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.5rem 0;
}
.split .card {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 1.1rem 1.25rem;
  border-radius: 4px;
}
.split .card h4 { margin-top: 0; color: var(--ink); }
.split .card p { font-size: 0.92rem; margin-bottom: 0; }
@media (max-width: 640px) { .split { grid-template-columns: 1fr; } }

/* ============================================================
   Tables
   ============================================================ */
.table-wrap {
  margin: 1.5rem 0;
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--paper);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-soft);
}
table caption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--muted);
  text-align: left;
  caption-side: bottom;
  padding: 0.75rem 1rem 0.4rem;
}
th {
  text-align: right;
  font-weight: 600;
  color: var(--ink);
  background: #f6f4ed;
  padding: 0.55rem 0.85rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
th.left { text-align: left; }
td {
  padding: 0.55rem 0.85rem;
  text-align: right;
  border-bottom: 1px solid var(--rule-soft);
  font-variant-numeric: tabular-nums;
}
td.left  { text-align: left; }
td.bold  { font-weight: 600; color: var(--ink); }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: #fbfaf3; }

tr.section-row td {
  background: #f6f4ed;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.45rem 0.85rem;
  text-align: left;
}
tr.row-human td { background: #fffbe6 !important; }
tr.row-human td.left::after { content: " ★"; color: var(--accent); }
.best { font-weight: 700; color: var(--ink); }
.runner { text-decoration: underline; text-decoration-thickness: 0.7px; text-underline-offset: 2px; color: var(--ink); }

/* Compact leaderboard — shrink everything so the perception table fits
   inside a typical laptop viewport without scrolling. */
.leaderboard-compact { padding: 2.25rem 0 2.5rem; }
.leaderboard-compact .section-label { margin-bottom: 0.85rem; }
.leaderboard-compact > .col-wide > p { font-size: 0.88rem; margin-bottom: 0.6rem; }
.leaderboard-compact .lb-toggle { margin: 0.2rem 0 0.7rem; }
.leaderboard-compact .lb-toggle button { font-size: 0.72rem; padding: 0.28rem 0.8rem; }
.leaderboard-compact .table-wrap { margin: 0.5rem 0; }
.leaderboard-compact table { font-size: 0.74rem; }
.leaderboard-compact th {
  padding: 0.4rem 0.65rem;
  font-size: 0.64rem;
  letter-spacing: 0.03em;
}
.leaderboard-compact td {
  padding: 0.32rem 0.65rem;
  line-height: 1.35;
}
.leaderboard-compact tr.section-row td {
  font-size: 0.62rem;
  padding: 0.3rem 0.65rem;
  letter-spacing: 0.1em;
}
.leaderboard-compact table caption {
  font-size: 0.8rem;
  padding: 0.55rem 0.8rem 0.3rem;
}
.leaderboard-compact .cta {
  margin-top: 1.25rem;
  padding: 1.1rem 1.35rem;
}
.leaderboard-compact .cta-title { font-size: 1rem; }
.leaderboard-compact .cta-text { font-size: 0.88rem; line-height: 1.5; }
.leaderboard-compact .cta-btn { font-size: 0.8rem; padding: 0.45rem 1rem 0.5rem; }

/* Toggle row groups */
.lb-toggle {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 2px;
  margin: 0.5rem 0 1rem;
  background: var(--paper);
}
.lb-toggle button {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 0.35rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s;
}
.lb-toggle button.active { background: var(--ink); color: var(--paper); }
.lb-toggle button:not(.active):hover { color: var(--ink); }

/* ============================================================
   Leaderboard CTA
   ============================================================ */
.cta {
  margin-top: 2.25rem;
  padding: 1.6rem 1.75rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.cta-body { flex: 1 1 360px; min-width: 0; }
.cta-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin-bottom: 0.35rem;
}
.cta-text {
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0;
}
.cta-btn {
  flex: 0 0 auto;
  white-space: nowrap;
  text-decoration: none;
  padding: 0.55rem 1.15rem 0.6rem;
  font-size: 0.86rem;
}
@media (max-width: 640px) {
  .cta { flex-direction: column; align-items: flex-start; padding: 1.4rem 1.4rem; }
  .cta-btn { width: 100%; justify-content: center; }
}

/* ============================================================
   Citation block
   ============================================================ */
.cite {
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.55;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1.1rem 1.25rem;
  color: var(--ink-soft);
  overflow-x: auto;
  white-space: pre;
}
.copy-btn {
  font-family: var(--sans);
  font-size: 0.74rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  margin-bottom: 0.6rem;
  transition: all 0.15s;
}
.copy-btn:hover { color: var(--ink); border-color: var(--ink); }

/* ============================================================
   Footer
   ============================================================ */
footer {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--rule);
  text-align: center;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--muted);
}
footer p { font-family: var(--sans); font-size: 0.78rem; color: var(--muted); margin-bottom: 0.3rem; }

/* Privacy / sample-omission note under the abstract */
.privacy-note {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-style: italic;
  line-height: 1.55;
  color: var(--muted);
  background: var(--rule-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.7rem 0.95rem;
  margin: 0.4rem 0 0;
}
.privacy-note .ic {
  width: 12px;
  height: 12px;
  stroke-width: 1.7;
  flex: 0 0 auto;
  margin-top: 0.22rem;
  color: var(--accent-ink);
}
.privacy-note a {
  color: var(--accent-ink);
  text-decoration: underline;
  text-decoration-thickness: 0.5px;
  text-underline-offset: 2px;
}
.privacy-note a:hover { text-decoration-thickness: 1.2px; }

/* small print */
.note {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
}