:root {
  --fg: #1a1a1a;
  --muted: #5a5a5a;
  --border: #e3e3e3;
  --accent: #1d4ed8;
  --accent-hover: #1e40af;
  --bg: #ffffff;
  --code-bg: #f6f6f6;
  --max-w: 820px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px 24px 80px;
}

/* Header */
.paper-header { text-align: center; margin-bottom: 40px; }

.paper-header h1 {
  font-size: 1.85rem;
  line-height: 1.25;
  margin: 0 0 12px;
  font-weight: 600;
}

.venue {
  margin: 0 0 18px;
  color: var(--muted);
  font-style: italic;
  font-size: 0.95rem;
}

.authors {
  margin: 0 auto 6px;
  max-width: 700px;
  text-align: center;
  font-size: 1rem;
  line-height: 1.7;
}

.affiliations {
  margin: 8px 0 4px;
  color: var(--muted);
  font-size: 0.95rem;
}

.contrib {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 0.88rem;
}

/* Links bar */
.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}

.links a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--fg);
  background: #fafafa;
  font-size: 0.95rem;
  transition: background 0.15s, border-color 0.15s;
}

.links a:hover {
  background: #f0f0f0;
  border-color: #c8c8c8;
}

/* Sections */
section {
  border-top: 1px solid var(--border);
  padding-top: 32px;
  margin-top: 36px;
}

section h2 {
  font-size: 1.35rem;
  margin: 0 0 14px;
  font-weight: 600;
}

section h3 {
  font-size: 1.05rem;
  margin: 22px 0 8px;
  font-weight: 600;
}

section p, section li { font-size: 1rem; }

ul { padding-left: 22px; }
li { margin-bottom: 8px; }

/* Inline links */
a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

/* Figures */
figure {
  margin: 28px auto 12px;
  text-align: center;
  max-width: 100%;
}

figure img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  max-height: 460px;
  width: auto;
  height: auto;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  padding: 4px;
}

figcaption {
  margin: 12px auto 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
  text-align: center;
}

/* Video grid */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin: 20px 0 8px;
}

.video-item {
  margin: 0;
  text-align: center;
}

.video-item video {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #000;
}

.video-item figcaption {
  margin-top: 8px;
  max-width: none;
}

/* A single wide video spans the full row */
.video-wide {
  grid-column: 1 / -1;
}

.video-wide video {
  max-width: 720px;
  margin: 0 auto;
}

/* Citation */
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.5;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

/* Code CTA */
.cta {
  display: inline-block;
  padding: 10px 18px;
  background: var(--fg);
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.95rem;
}

.cta:hover { background: #000; color: #fff; }

/* Footer */
footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

/* Small screens */
@media (max-width: 600px) {
  main { padding: 36px 18px 60px; }
  .paper-header h1 { font-size: 1.45rem; }
  .authors { font-size: 0.95rem; }
  .video-grid { grid-template-columns: 1fr; gap: 18px; }
}