:root {
  --accent: #328e91;
  --joint: #a23aa3;
  --fact: #2a9d8f;
  --text: #222;
  --muted: #666;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: #fff;
}
a { color: var(--accent); }
.hero {
  text-align: center;
  padding: 3.5rem 1rem 2rem;
  background: linear-gradient(#eef7f7, #fff);
}
.hero h1 { font-size: 2.8rem; margin: 0 0 1rem; }
.authors { font-size: 1.15rem; margin: 0.3rem 0; }
.authors a { text-decoration: none; margin: 0 0.4rem; }
.venue { color: var(--muted); margin: 0.3rem 0 1.5rem; }
.buttons { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }
.btn {
  background: var(--accent);
  color: #fff;
  padding: 0.55rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
}
.btn:hover { opacity: 0.85; }
.btn.disabled { background: #bbb; cursor: default; }
main { max-width: 880px; margin: 0 auto; padding: 0 1rem 3rem; }
section { margin: 4.5rem 0; }
h2 { border-bottom: 2px solid var(--accent); padding-bottom: 0.3rem; }
h3 { margin-top: 2rem; }
figure { margin: 1.5rem 0; text-align: center; }
img, video { max-width: 100%; height: auto; border-radius: 6px; }
video { display: block; margin: 1rem auto; width: 100%; }
figcaption, .caption { color: var(--muted); font-size: 0.92rem; margin-top: 0.5rem; text-align: center; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.card { padding: 1rem 1.2rem; border-radius: 8px; border-top: 4px solid; background: #fafafa; }
.card h3 { margin-top: 0; }
.card.joint { border-color: var(--joint); }
.card.fact { border-color: var(--fact); }
pre {
  background: #f4f4f4;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.88rem;
}
button {
  background: var(--accent);
  color: #fff;
  border: 0;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
}
footer { text-align: center; color: var(--muted); padding: 2rem 1rem; font-size: 0.85rem; }
@media (max-width: 640px) {
  .cols { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
}
.tldr { text-align: center; font-size: 1.1rem; }
.card .MathJax, .card mjx-container { overflow-x: auto; max-width: 100%; }
.subtitle { font-size: 1.3rem; color: var(--muted); margin: -0.4rem 0 1.2rem; }