/* ============================================================
   DECOMP — Cross-region shared subspaces in mouse cortex
   Distill.pub-inspired single-page scrolling layout
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --text: #1a1a2e;
  --text-light: #555;
  --text-muted: #888;
  --bg: #fff;
  --bg-alt: #f6f8fa;
  --accent: #2c7fb8;       /* DECOMP blue — between sky and slate */
  --accent-strong: #1a5a87;
  --pair-viscb: #3498db;   /* blue */
  --pair-vismo: #f39c12;   /* orange */
  --pair-cbmo: #e74c3c;    /* red */
  --hero-bg: #0d1b2a;       /* dark navy */
  --hero-accent: #4cc9f0;
  --border: #e3e6ea;
  --max-text: 900px;
  --max-figure: 900px;
}

html {
  scroll-behavior: smooth;
  font-size: 18px;
}

body {
  font-family: 'Source Serif 4', 'Georgia', serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; }
h2 { font-size: 1.85rem; margin-bottom: 0.5em; }
h3 { font-size: 1.25rem; margin-bottom: 0.4em; margin-top: 1.6em; }
p  { margin-bottom: 1em; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
a:hover { border-bottom-color: var(--accent); }

strong { font-weight: 700; }
em { font-style: italic; }
code, .code-inline {
  font-family: 'JetBrains Mono', 'Menlo', monospace;
  font-size: 0.88em;
  background: var(--bg-alt);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  color: var(--text);
}

/* --- Layout --- */
.container {
  max-width: var(--max-text);
  margin: 0 auto;
  padding: 0 1.5rem;
}
section { padding: 4rem 0; }
section:nth-child(even) { background: var(--bg-alt); }

/* --- Nav bar --- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10000;
  background: rgba(13, 27, 42, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-family: 'Inter', sans-serif;
}
.nav-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 48px;
}
.nav-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.04em;
}
.nav-tabs { display: flex; gap: 0; }
.nav-tab {
  font-size: 0.78rem;
  font-weight: 500;
  color: rgba(255,255,255,0.55);
  padding: 0.85em 1.2em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav-tab:hover { color: #fff; border-bottom-color: rgba(255,255,255,0.25); }
.nav-tab.active { color: #fff; border-bottom-color: var(--hero-accent); }

/* --- Hero --- */
.hero {
  height: 100vh;
  min-height: 620px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--hero-bg);
  color: #fff;
  position: relative;
  padding: 2rem;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  filter: brightness(0.85) saturate(0.95);
  background: var(--hero-bg);   /* letterbox fill matches hero */
}
.hero-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(180deg, rgba(13,27,42,0.40) 0%, rgba(13,27,42,0.75) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
}
.hero .eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--hero-accent);
  margin-bottom: 1.2em;
  font-weight: 600;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.6em;
  line-height: 1.18;
}
.hero .subtitle {
  font-family: 'Inter', sans-serif;
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  font-weight: 400;
  color: rgba(255,255,255,0.78);
  max-width: 700px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}
.hero .authors {
  font-family: 'Inter', sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.02em;
}
.hero .authors span { margin: 0 0.4em; }
.hero .institution {
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.6);
  margin-top: 0.9em;
  line-height: 1.7;
}
.hero .links { margin-top: 1.8em; display: flex; gap: 0.6em; flex-wrap: wrap; justify-content: center; }
.hero .pill-link {
  display: inline-flex;
  align-items: center;
  font-family: 'Inter', sans-serif;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  padding: 0.45em 1em;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.hero .pill-link:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.05);
}
.hero .pill-link svg { margin-right: 0.5em; vertical-align: -3px; }
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: rgba(255,255,255,0.35);
  font-size: 1.5rem;
  z-index: 2;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(8px); }
}

/* --- Section labels --- */
.section-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.5em;
}

/* --- Abstract --- */
.abstract { background: var(--bg-alt); }
.abstract-text {
  font-size: 1.05rem;
  color: var(--text-light);
  border-left: 3px solid var(--accent);
  padding-left: 1.2em;
  font-style: italic;
}

/* --- Figures --- */
.figure {
  margin: 2.5rem auto;
  text-align: center;
}
.figure-wide {
  max-width: var(--max-figure);
  margin-left: auto;
  margin-right: auto;
  padding: 0 1.5rem;
}
.figure img,
.figure video {
  width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
}
.figure-caption {
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.8em;
  line-height: 1.6;
  max-width: var(--max-text);
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}
.figure-caption strong { color: var(--text-light); }

/* --- Side-by-side figure pair --- */
.figure-pair {
  max-width: var(--max-figure);
  margin: 2.5rem auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 1.5rem;
  align-items: start;
}
.figure-pair .figure { margin: 0; }
.figure-pair .figure img,
.figure-pair .figure video {
  border-radius: 4px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  width: 100%;
  height: auto;
}
.figure-pair .figure-caption {
  font-family: 'Inter', sans-serif;
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.7em;
  line-height: 1.55;
  text-align: left;
}
@media (max-width: 768px) {
  .figure-pair { grid-template-columns: 1fr; }
}

/* --- Finding callouts --- */
.finding {
  background: linear-gradient(135deg, rgba(44, 127, 184, 0.06), rgba(76, 201, 240, 0.04));
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1.2em 1.5em;
  margin: 1.6rem 0;
  font-size: 0.95rem;
}
.finding strong { color: var(--accent-strong); }

/* --- Method note (orange) --- */
.method-note {
  background: linear-gradient(135deg, rgba(243, 156, 18, 0.07), rgba(243, 156, 18, 0.02));
  border-left: 4px solid #e67e22;
  border-radius: 0 6px 6px 0;
  padding: 1em 1.3em;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}
.method-note strong { color: #b9580d; }
.method-note p:last-child { margin-bottom: 0; }

/* --- Stat row --- */
.stat-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 1.6rem 0;
}
.stat {
  flex: 1;
  min-width: 140px;
  text-align: center;
  padding: 1.1em 1em;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
}
.stat-value {
  font-family: 'Inter', sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}
.stat-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.3em;
  display: block;
}

/* --- Pair tags --- */
.pair-tag {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 0.15em 0.55em;
  border-radius: 3px;
  vertical-align: baseline;
  white-space: nowrap;
}
.pair-tag.viscb { background: rgba(52,152,219,0.15); color: var(--pair-viscb); }
.pair-tag.vismo { background: rgba(243,156,18,0.18); color: #c46a07; }
.pair-tag.cbmo  { background: rgba(231,76,60,0.15); color: var(--pair-cbmo); }

/* --- Pipeline diagram --- */
.pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  margin: 2rem 0;
  font-family: 'Inter', sans-serif;
}
.pipeline-step {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1em 0.9em;
  text-align: center;
  font-size: 0.85rem;
}
.pipeline-step strong {
  display: block;
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 0.3em;
}
.pipeline-step small {
  display: block;
  margin-top: 0.4em;
  color: var(--text-muted);
  font-size: 0.72rem;
}
.pipeline-step::after {
  content: '→';
  position: absolute;
  right: -0.7rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-family: serif;
  font-size: 1.4rem;
  font-weight: 700;
  z-index: 2;
}
.pipeline-step:last-child::after { content: ''; }

/* --- Questions list --- */
.questions-list {
  list-style: none;
  padding: 0;
  counter-reset: q;
}
.questions-list li {
  counter-increment: q;
  padding: 1em 1.2em 1em 3.2em;
  margin-bottom: 0.8em;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  position: relative;
  line-height: 1.65;
}
.questions-list li::before {
  content: counter(q);
  position: absolute;
  left: 1em;
  top: 1em;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
}

/* --- Tables --- */
.results-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-family: 'Inter', sans-serif;
  font-size: 0.86rem;
}
.results-table th,
.results-table td {
  padding: 0.7em 0.9em;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.results-table th {
  background: var(--bg-alt);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.74rem;
  color: var(--text-muted);
}
.results-table td.num { font-variant-numeric: tabular-nums; text-align: right; }
.results-table tr:last-child td { border-bottom: none; }

/* --- Conclusion (dark) --- */
.conclusion {
  background: var(--hero-bg) !important;
  color: #fff;
  padding: 5rem 0;
}
.conclusion h2 { color: #fff; }
.conclusion h3 { color: rgba(255,255,255,0.75); margin-top: 2em; }
.conclusion p { color: rgba(255,255,255,0.78); }
.conclusion .section-label { color: rgba(255,255,255,0.55); }
.conclusion .finding {
  background: rgba(255,255,255,0.06);
  border-left-color: rgba(255,255,255,0.3);
}
.conclusion .finding strong { color: #fff; }
.conclusion a { color: var(--hero-accent); }

/* --- References --- */
.references { font-size: 0.82rem; color: var(--text-light); line-height: 1.7; padding-left: 1.2em; }
.references li { margin-bottom: 0.5em; }

/* --- Reveal-on-scroll --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 2rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--hero-bg);
  border-top: 1px solid rgba(255,255,255,0.06);
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--hero-accent); border-bottom-color: var(--hero-accent); }

/* --- Appendix page --- */
.appendix-body { padding-top: 48px; }   /* clear the fixed nav (48 px tall) */

.appendix-header {
  background: var(--hero-bg);
  color: #fff;
  padding: 6rem 1.5rem 4rem;
  text-align: center;
}
.appendix-header .container {
  max-width: var(--max-figure);
}
.appendix-header h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  margin-bottom: 0.6em;
  color: #fff;
}
.appendix-header .appendix-sub {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  color: rgba(255,255,255,0.65);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Section boxes */
.section-boxes {
  background: var(--bg-alt);
  padding: 3rem 0 2.5rem;
}
.box-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.box-grid.box-grid-3 { grid-template-columns: repeat(3, 1fr); }
.section-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.8rem 1.1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.section-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  border-color: var(--accent);
  border-bottom-color: var(--accent);
}
.box-number {
  font-family: 'Inter', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.4em;
}
.box-title {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.3em;
}
.box-range {
  font-family: 'Inter', sans-serif;
  font-size: 0.74rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* Group heading (per-section banner inside appendix) */
.group-heading {
  background: var(--hero-bg);
  color: #fff;
  padding: 3rem 1.5rem 2.2rem;
  text-align: center;
  scroll-margin-top: 60px;
}
.group-number {
  font-family: 'Inter', sans-serif;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hero-accent);
  display: block;
  margin-bottom: 0.5em;
}
.group-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0;
}

/* Appendix sections — fix scroll offset */
.appendix-body section[id] { scroll-margin-top: 60px; }
.appendix-body section ul, .appendix-body section ol {
  padding-left: 1.4em;
  margin-bottom: 1em;
}

/* Mobile */
@media (max-width: 768px) {
  .box-grid,
  .box-grid.box-grid-3 { grid-template-columns: repeat(2, 1fr); gap: 0.8rem; }
  .section-box { padding: 1.3rem 0.9rem; }
  .appendix-header { padding: 4rem 1.5rem 2.5rem; }
}

/* ============================================================
   MathJax — keep long display equations on the page
   ============================================================ */
mjx-container[jax="CHTML"][display="true"],
mjx-container[jax="SVG"][display="true"] {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.35rem 0.15rem;
  -webkit-overflow-scrolling: touch;
}
mjx-container[jax="CHTML"][display="true"] > mjx-math,
mjx-container[jax="SVG"][display="true"] > svg {
  max-width: none;        /* let the math keep its natural width inside the scroller */
}
mjx-container[jax="CHTML"]:not([display="true"]) {
  max-width: 100%;
  white-space: normal;    /* inline math should wrap with surrounding text */
}
@media (max-width: 600px) {
  mjx-container[jax="CHTML"][display="true"],
  mjx-container[jax="SVG"][display="true"]  { font-size: 92%; }
}
@media (max-width: 420px) {
  mjx-container[jax="CHTML"][display="true"],
  mjx-container[jax="SVG"][display="true"]  { font-size: 85%; }
}

/* --- Floating TOC --- */
.floating-toc {
  position: fixed;
  top: 64px;
  left: 16px;
  width: 200px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  z-index: 9990;
  opacity: 0;
  transform: translateX(-12px);
  pointer-events: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7em 0.6em;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  font-family: 'Inter', sans-serif;
}
.floating-toc.visible { opacity: 1; transform: translateX(0); pointer-events: auto; }
.floating-toc a {
  display: block;
  text-decoration: none;
  border-bottom: none;
  border-radius: 3px;
  line-height: 1.4;
  font-size: 0.72rem;
  color: var(--text-light);
  padding: 0.3em 0.5em;
  transition: color 0.15s, background 0.15s;
}
.floating-toc a:hover { color: var(--accent); background: rgba(44, 127, 184, 0.06); }
.floating-toc a.active { color: var(--accent); font-weight: 600; }
.floating-toc::-webkit-scrollbar { width: 3px; }
.floating-toc::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* --- Back-to-top --- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s, background 0.2s;
  pointer-events: none;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--accent-strong); border-bottom-color: transparent; }

/* --- Responsive --- */
@media (max-width: 1100px) { .floating-toc { display: none; } }
@media (max-width: 768px) {
  html { font-size: 16px; }
  section { padding: 3rem 0; }
  .hero { min-height: 80vh; }
  .pipeline { grid-template-columns: 1fr 1fr; }
  .pipeline-step::after { content: ''; }
  .stat-row { flex-direction: column; }
}
@media (max-width: 480px) {
  html { font-size: 15px; }
  .container { padding: 0 1rem; }
  h2 { font-size: 1.5rem; }
  .nav-title { display: none; }
}