:root {
  --navy: #1a2744;
  --orange: #e57200;
  --orange-light: #f5a623;
  --bg: #f8f9fc;
  --card-bg: #ffffff;
  --text: #1e2330;
  --muted: #4e5468;
  --border: #e2e6f0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(26,39,68,0.09);
  --shadow-hover: 0 8px 36px rgba(26,39,68,0.16);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

/* ── SKIP LINK ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--orange);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 700;
  text-decoration: none;
  z-index: 200;
  transition: top 0.15s;
}
.skip-link:focus { top: 0; }

/* ── NAV ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26,39,68,0.97);
  backdrop-filter: blur(8px);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

nav .nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--orange-light);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-brand-icon {
  height: 24px;
  width: 24px;
  object-fit: contain;
}
nav .nav-brand:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 3px; border-radius: 4px; }

nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem;
}
nav ul a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}
nav ul a:hover { background: rgba(255,255,255,0.1); color: #fff; }
nav ul a:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 2px; }

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, #2a3f7a 60%, #1a2744 100%);
  color: #fff;
  padding: 5rem 2rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 40%, rgba(229,114,0,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  background: rgba(229,114,0,0.2);
  border: 1px solid rgba(229,114,0,0.4);
  color: var(--orange-light);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  margin-top: 1rem;
  margin-bottom: 1.25rem;
}

.hero-title-name {
  color: var(--orange-light);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 820px;
  margin: 0 auto 1rem;
}
.hero h1 span { color: var(--orange-light); }

.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  max-width: 620px;
  margin: 0 auto 2rem;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.25); }
.btn:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 3px; }
.btn-primary { background: var(--orange); color: #fff; }
.btn-outline { background: transparent; border: 1.5px solid rgba(255,255,255,0.4); color: #fff; }
.btn-outline:hover { border-color: rgba(255,255,255,0.8); }
.btn-dark { background: var(--navy); color: #fff; border: 1.5px solid rgba(255,255,255,0.15); }
.btn-dark:focus-visible { outline-color: var(--orange); }

/* ── STATS BAR ── */
.stats-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  max-width: 700px;
  margin: 0 auto;
  overflow: hidden;
}
.stat-item {
  flex: 1;
  min-width: 130px;
  padding: 1.1rem 1.5rem;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,0.1);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--orange-light);
  line-height: 1;
  display: block;
}
.stat-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.82);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── SECTIONS ── */
section { padding: 4.5rem 2rem; scroll-margin-top: 56px; }
section.section-bg-white { background: #fff; }

.container { max-width: 1060px; margin: 0 auto; }

.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 0.5rem;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--navy);
  margin-bottom: 0.75rem;
}
.section-desc {
  color: var(--muted);
  max-width: 640px;
  margin-bottom: 2.5rem;
  font-size: 1rem;
}
.section-desc-centered { margin-left: auto; margin-right: auto; }
.section-centered { text-align: center; }

/* ── PIPELINE FIGURE ── */
.figure-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.figure-block img { width: 100%; display: block; }
.figure-caption {
  padding: 0.85rem 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: #fafbfd;
}
.figure-block-spaced { margin-bottom: 2rem; }
.figure-block-wrapper { margin-top: 2.5rem; }
.figure-padded img { padding: 1.25rem; background: #fff; }

/* ── PIPELINE STEPS ── */
.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}
.step-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}
.step-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.step-num {
  width: 36px; height: 36px;
  background: var(--navy);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  margin-bottom: 0.85rem;
}
.step-card h3 { font-size: 1rem; font-weight: 700; color: var(--navy); margin-bottom: 0.4rem; }
.step-card p { font-size: 0.875rem; color: var(--muted); line-height: 1.6; }

/* ── MOTIVATION CARDS ── */
.motivation-intro {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}
.motivation-figure {
  flex: 0 0 340px;
  max-width: 340px;
}
@media (max-width: 700px) {
  .motivation-intro { flex-direction: column; }
  .motivation-figure { flex: none; max-width: 100%; }
}
.motivation-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.challenge-list {
  margin: 0.4rem 0 0 1.1rem;
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

/* ── TAXONOMY TABLE ── */
.taxonomy-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}
.taxonomy-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
}
.taxonomy-table-caption {
  caption-side: top;
  text-align: left;
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 0 0.5rem;
  font-style: italic;
  display: block;
}
.taxonomy-table th {
  background: var(--navy);
  color: #fff;
  padding: 0.85rem 1rem;
  text-align: left;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.taxonomy-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.taxonomy-table tr:last-child td { border-bottom: none; }
.taxonomy-table tr:hover td { background: #f5f7fc; }
.taxonomy-category {
  font-weight: 700;
  vertical-align: middle;
}
.taxonomy-category-i { color: #1a237e; }
.taxonomy-category-u { color: #1b5e20; }
.taxonomy-subtotal { font-weight: 400; font-size: 0.8rem; color: var(--muted); }
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
}
.tag-i { background: #e8eaf6; color: #1a237e; }
.tag-u { background: #e8f5e9; color: #1b5e20; }
.count-badge {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.1rem 0.55rem;
  color: var(--muted);
}

/* ── RESULTS ── */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
  align-items: stretch;
}
@media (max-width: 700px) { .results-grid { grid-template-columns: 1fr; } }

/* When side by side, make pie chart match the height of the adjacent figure */
@media (min-width: 701px) {
  .results-pie-block img {
    width: 70%;
    display: block;
    margin: 0 auto;
  }
  .results-grid .figure-block:first-child {
    background: #fafbfd;
  }
}

/* ── ERRATA CARDS ── */
.errata-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}
.errata-grid .errata-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  width: calc(50% - 0.625rem);
  margin: 0 auto;
}
@media (max-width: 700px) {
  .errata-grid { grid-template-columns: 1fr; }
  .errata-grid .errata-card:last-child:nth-child(odd) {
    grid-column: auto;
    width: auto;
  }
}
.errata-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.errata-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.1rem;
  background: var(--navy);
  color: #fff;
}
.errata-card-header .errata-id { font-weight: 700; font-size: 0.9rem; }
.errata-card-header a { color: rgba(255,255,255,0.9); font-size: 0.78rem; text-decoration: none; }
.errata-card-header a:hover { color: #fff; }
.errata-card-header a:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 2px; border-radius: 3px; }
.errata-card-body { padding: 1rem 1.1rem; }
.errata-card-body pre {
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
  background: #f5f7fc;
  border-radius: 6px;
  padding: 0.75rem;
  border: 1px solid var(--border);
}
mark.highlight-red {
  background: #ffd6d6;
  border-radius: 2px;
  padding: 0 2px;
  color: inherit;
}
.errata-verified {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #2e7d32;
  background: #e8f5e9;
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  margin-top: 0.6rem;
}

/* ── AUTHORS ── */
.authors-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
  justify-content: center;
}
.author-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  min-width: 160px;
  flex: 1;
  max-width: 200px;
}
.author-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.author-card a { text-decoration: none; color: inherit; display: block; }
.author-card a:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; border-radius: var(--radius); }
.author-initial {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 0.75rem;
}
.author-name { font-weight: 700; font-size: 0.95rem; color: var(--navy); }
.author-affil { font-size: 0.78rem; color: var(--muted); margin-top: 0.2rem; }

.affil-logos {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 2.5rem;
}
.affil-logo { height: 60px; opacity: 0.75; }

/* ── REPO SECTION ── */
.repo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.1rem;
  margin-top: 2rem;
}
.repo-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.repo-card:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; border-radius: var(--radius); }
.repo-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.repo-card-icon { font-size: 1.5rem; margin-bottom: 0.6rem; }
.repo-card h3 { font-size: 0.95rem; font-weight: 700; color: var(--navy); margin-bottom: 0.35rem; font-family: var(--mono); }
.repo-card p { font-size: 0.85rem; color: var(--muted); line-height: 1.55; }
.repo-actions { margin-top: 2rem; display: flex; gap: 1rem; flex-wrap: wrap; }

/* ── CITE ── */
.cite-block {
  background: var(--navy);
  color: #e8ecf5;
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.8;
  overflow-x: auto;
  box-shadow: var(--shadow);
  white-space: pre;
}
.cite-block code { font-family: inherit; }

/* ── FOOTER ── */
footer {
  background: var(--navy);
  color: rgba(255,255,255,0.75);
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
}
footer a { color: rgba(255,255,255,0.85); text-decoration: none; }
footer a:hover { color: #fff; }
footer a:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 2px; border-radius: 3px; }
.footer-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.footer-logos img { height: 52px; filter: brightness(0) invert(1); opacity: 0.7; }

/* ── HAMBURGER BUTTON ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  border-radius: 6px;
  transition: background 0.15s;
}
.nav-hamburger:hover { background: rgba(255,255,255,0.1); }
.nav-hamburger:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 2px; }
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.85);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── MOBILE MENU ── */
.nav-mobile {
  display: none;
  background: rgba(26,39,68,0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.07);
  position: sticky;
  top: 56px;
  z-index: 99;
}
.nav-mobile.open { display: block; }
.nav-mobile ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  padding: 0.5rem 1rem 0.75rem;
}
.nav-mobile ul a {
  display: block;
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.925rem;
  padding: 0.6rem 0.75rem;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}
.nav-mobile ul a:hover { background: rgba(255,255,255,0.1); color: #fff; }
.nav-mobile ul a:focus-visible { outline: 2px solid var(--orange-light); outline-offset: 2px; }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  nav ul { display: none; }
  .nav-hamburger { display: flex; }
  .stats-bar { flex-direction: column; }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .stat-item:last-child { border-bottom: none; }
  .results-grid { grid-template-columns: 1fr; }
}

/* ── PRINT ── */
@media print {
  nav, .hero-links, .repo-actions, footer { display: none; }
  .hero {
    background: none;
    color: var(--text);
    padding: 1rem 0;
  }
  .hero h1 span { color: var(--navy); }
  .hero-badge { border: 1px solid var(--navy); color: var(--navy); background: none; }
  .hero-subtitle { color: var(--muted); }
  .stats-bar { border: 1px solid var(--border); background: none; }
  .stat-num { color: var(--navy); }
  .stat-label { color: var(--muted); }
  section { padding: 1.5rem 0; break-inside: avoid; }
  .figure-block, .step-card, .errata-card, .author-card, .repo-card { box-shadow: none; border: 1px solid var(--border); }
  .errata-card-header { background: var(--navy); -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .cite-block { background: var(--navy); -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}