:root {
  --bg: #ffffff;
  --surface: #f5f5f5;
  --border: #e0e0e0;
  --accent: #2563c0;
  --accent-light: #1a4fa0;
  --text: #1a1a1a;
  --text-muted: #555;
  --text-dim: #999;
  --radius: 12px;
  --max-w: 900px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Georgia', serif;
  font-size: 17px;
  line-height: 1.75;
}

/* ── TOC ── */
.toc {
  position: fixed;
  top: 40px;
  left: max(16px, calc(50% - var(--max-w)/2 - 180px));
  width: 160px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 13px;
  z-index: 100;
}

.toc h3 {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.toc hr {
  border: none;
  border-top: 1px solid var(--border);
  margin-bottom: 10px;
}

.toc ul { list-style: none; }

.toc ul li { margin-bottom: 6px; }

.toc ul li a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.toc ul li a:hover { color: var(--accent-light); }

/* ── Main ── */
.main-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 60px 24px 100px;
}

/* ── Hero ── */
.hero-text {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -1px;
  color: #111;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hl {
  color: var(--accent);
  font-weight: 700;
}

.sub-hero-text {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 20px;
  font-family: 'Helvetica Neue', sans-serif;
  line-height: 1.4;
}

.authors {
  font-size: 15px;
  color: var(--text-dim);
  font-family: 'Helvetica Neue', sans-serif;
  margin-bottom: 32px;
  font-style: italic;
}

/* ── Quick links ── */
.quick-links {
  display: flex;
  gap: 12px;
  margin: 24px 0 48px;
  font-family: 'Helvetica Neue', sans-serif;
}

.quick-links a {
  display: inline-block;
  padding: 7px 18px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--accent-light);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.2s, border-color 0.2s;
}

.quick-links a:hover {
  background: var(--surface);
  border-color: var(--accent);
}

/* ── Teaser video ── */
.teaser-wrap {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
  border: 1px solid var(--border);
}

.teaser-wrap video { display: block; width: 100%; }

/* ── Section tagline ── */
.tagline {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 60px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ── Body text ── */
.section {
  color: var(--text);
  margin-bottom: 24px;
}

.section p { margin-bottom: 16px; }

.section ul {
  padding-left: 24px;
  margin: 12px 0;
}

.section ul li { margin-bottom: 8px; }

/* ── Figure captions ── */
.figure-caption {
  font-size: 14px;
  color: var(--text-muted);
  font-family: 'Helvetica Neue', sans-serif;
  margin-top: 10px;
  margin-bottom: 32px;
  line-height: 1.5;
}

/* ── Images ── */
.full-img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 20px 0 8px;
}

/* ── Video grid ── */
.video-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}

.video-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}

.video-grid-2 figure,
.video-grid-3 figure {
  margin: 0;
}

.video-grid-2 video,
.video-grid-3 video {
  width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
  border: 1px solid var(--border);
}

.video-grid-2 figcaption,
.video-grid-3 figcaption {
  font-size: 13px;
  color: var(--text-muted);
  font-family: 'Helvetica Neue', sans-serif;
  margin-top: 6px;
  line-height: 1.4;
}

/* ── Wrap figure (float right, ~half width) ── */
.wrapfig-right {
  float: right;
  width: 50%;
  margin: 4px 0 16px 28px;
}

.wrapfig-right img {
  display: block;
  width: 100%;
}

@media (max-width: 640px) {
  .wrapfig-right {
    float: none;
    width: 100%;
    margin: 16px 0;
  }
}

/* ── Pipeline figure ── */
.pipeline-wrap {
  margin: 20px 0 8px;
}

.pipeline-wrap img { display: block; width: 100%; }

/* ── Table ── */
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 14px;
  margin: 20px 0;
}

.results-table th {
  background: var(--surface);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.results-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.results-table tr:last-child td { border-bottom: none; }

.results-table tr:hover td { background: var(--surface); }

.results-table .best { color: var(--accent-light); font-weight: 700; }

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 40px 24px;
  font-size: 13px;
  color: var(--text-dim);
  font-family: 'Helvetica Neue', sans-serif;
  border-top: 1px solid var(--border);
}

.footer a { color: var(--text-muted); text-decoration: none; }
.footer a:hover { color: var(--accent-light); }

/* ── Responsive ── */
@media (max-width: 1100px) {
  .toc { display: none; }
}

@media (max-width: 640px) {
  .hero-text { font-size: 32px; }
  .sub-hero-text { font-size: 16px; }
  .video-grid-2, .video-grid-3 { grid-template-columns: 1fr; }
}