:root {
  --max-w: 720px;
  --accent: #1D9E75;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --bg: #ffffff;
  --bg-secondary: #f7f8f7;
  --border: #e5e7eb;
  --border-subtle: #d1d5db;
  --font-size-base: 15px;
  --font-size-caption: 12.5px;
  --font-size-small: 12px;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: var(--font-size-base);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* ── Header ───────────────────────────────────────────── */
header {
  text-align: center;
  padding: 3.5rem 0 2rem;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 1.4rem;
}

.author-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 1rem;
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}

.equal-contrib {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.7rem;
}

.affiliation {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.4rem;
}

.link-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 5px 14px;
  border: 0.5px solid var(--border-subtle);
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.85rem;
  text-decoration: none;
  transition: border-color 0.15s;
}

.pill:hover { border-color: var(--accent); }

.pill svg { flex-shrink: 0; }

/* ── Section ──────────────────────────────────────────── */
.section {
  margin: 3rem 0;
}

.section h2 {
  font-size: 1.15rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.subsection-h {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin: 1.75rem 0 0.6rem;
  letter-spacing: -0.005em;
}

.section h2 + .subsection-h {
  margin-top: 0.25rem;
}

/* ── One-line description ─────────────────────────────── */
.description {
  text-align: center;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--text);
  margin: 0;
  padding: 0.25rem 0;
}

/* ── Teaser ───────────────────────────────────────────── */
.teaser-wrap {
  margin: 2rem 0 1rem;
}

.teaser-wrap figure {
  margin: 0;
}

.teaser-wrap video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

/* ── Figures ──────────────────────────────────────────── */
figure {
  margin: 1.25rem 0;
  text-align: center;
}

figure img,
figure object {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

figcaption {
  font-size: var(--font-size-caption);
  color: var(--text-muted);
  margin-top: 0.55rem;
  text-align: left;
  line-height: 1.5;
}

figcaption strong {
  color: var(--text);
}

.figures-row {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.figures-row figure {
  flex: 1;
}

/* ── Abstract ─────────────────────────────────────────── */
#abstract h2 { text-align: center; }

.abstract-body {
  text-align: justify;
  hyphens: auto;
}

/* ── Lead-in paragraphs ───────────────────────────────── */
.lead-in {
  margin-bottom: 1rem;
  line-height: 1.65;
}

/* ── Standalone figure caption (under a chart/table, not in a <figure>) ─── */
.figcap-stand {
  font-size: var(--font-size-caption);
  color: var(--text-muted);
  margin-top: 0.55rem;
  line-height: 1.5;
}

/* ── KaTeX display equations ───────────────────────────── */
.equation {
  margin: 0.9rem 0 0.9rem;
  text-align: center;
  overflow-x: auto;
  overflow-y: hidden;
}

.katex-display {
  margin: 0 !important;
  font-size: 1em;
}

.katex { font-size: 1em; }

/* ── "Why CoSiNE?" bullet list ─────────────────────────── */
.why-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.why-list li {
  padding: 0.6rem 0.95rem;
  margin-bottom: 0.55rem;
  background: var(--bg-secondary);
  border-left: 2px solid var(--accent);
  border-radius: 0 4px 4px 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

.why-list li:last-child { margin-bottom: 0; }

/* ── CDR optimization table: reference (Greedy*) row ──── */
tbody tr.reference-row {
  color: var(--text-muted);
  font-style: italic;
}

tbody tr.reference-row td:first-child {
  font-style: italic;
}

/* ── Chart ────────────────────────────────────────────── */
.chart-container {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

.chart-legend {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  margin-bottom: 0.6rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.legend-swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  vertical-align: middle;
  margin-right: 4px;
}

/* ── Table ────────────────────────────────────────────── */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0;
}

table {
  border-collapse: collapse;
  font-size: var(--font-size-small);
  font-variant-numeric: tabular-nums;
  width: 100%;
  white-space: nowrap;
}

thead th {
  font-weight: 500;
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  text-align: right;
}

thead th:first-child { text-align: left; }

thead tr.group-header th {
  text-align: center;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  padding-bottom: 2px;
  border-bottom: none;
}

thead tr.group-header th:first-child { text-align: left; }

tbody td {
  padding: 4px 8px;
  border-top: 0.5px solid var(--border);
  text-align: right;
}

tbody td:first-child { text-align: left; }

tbody tr.cosine-row {
  background: var(--bg-secondary);
  font-weight: 500;
}

td.group-start,
th.group-start {
  border-left: 1px solid var(--border-subtle);
}

/* ── BibTeX ───────────────────────────────────────────── */
.bibtex {
  background: var(--bg-secondary);
  border: 0.5px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
  color: var(--text);
}

/* ── In-text links (citations) ────────────────────────── */
.section p a,
.abstract-body a,
.why-list li a,
figcaption a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(29, 158, 117, 0.35);
  transition: border-color 0.15s, color 0.15s;
}

.section p a:hover,
.abstract-body a:hover,
.why-list li a:hover,
figcaption a:hover {
  border-bottom-color: var(--accent);
  color: #157a5b;
}

/* ── Lightbox (click-to-expand for figures, chart, tables) ─── */
.zoomable { cursor: zoom-in; }

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2.5rem;
}

.lightbox[hidden] { display: none; }

.lightbox-content {
  max-width: 92vw;
  max-height: 90vh;
  background: var(--bg);
  border-radius: 6px;
  padding: 1.25rem;
  overflow: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.lightbox-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.lightbox-content .table-scroll {
  margin: 0;
}

.lightbox-content .lightbox-chart {
  width: min(85vw, 1200px);
  height: min(70vh, 700px);
  position: relative;
}

.lightbox-content .lightbox-chart canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.lightbox-content table {
  font-size: 0.95rem;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  transition: background 0.15s;
}

.lightbox-close:hover { background: rgba(255, 255, 255, 0.1); }

body.lightbox-open { overflow: hidden; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 540px) {
  header h1 { font-size: 1.3rem; }
  .figures-row { flex-direction: column; }
  .lightbox { padding: 1rem; }
  .lightbox-content { padding: 0.75rem; }
}