:root {
  --ink: #222;
  --muted: #5f6368;
  --line: #ececec;
  --link: #005dab;
  --uw-purple: #4b2e83;
  --max-width: 1120px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.62;
}

main {
  max-width: var(--max-width);
  margin: 56px auto 28px;
  padding: 0 22px;
}

.paper-header {
  max-width: 1080px;
  margin: 0 auto 46px;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4.6vw, 3.35rem);
  line-height: 1.12;
  font-weight: 550;
  letter-spacing: -0.03em;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.2rem 1rem;
  margin: 22px auto 8px;
  font-size: 1.08rem;
}

.authors span { white-space: nowrap; }
sup { font-size: 0.68em; vertical-align: super; }

.affiliation {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.venue {
  margin: 18px 0 22px;
  color: var(--uw-purple);
  font-size: 0.98rem;
  font-weight: 700;
}

.links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.button {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  border: 1px solid #d9d9de;
  border-radius: 6px;
  color: #333;
  background: #fff;
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 600;
}

.button:hover {
  border-color: #aaa;
  text-decoration: none;
}

section { margin: 0 0 44px; }

h2 {
  margin: 0 0 16px;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--line);
  font-size: 1.75rem;
  font-weight: 500;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 600;
}

p { margin: 0.8rem 0; }
a { color: var(--link); }

.abstract-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 28px;
  align-items: start;
}

.abstract-text p { margin-top: 0; }

.abstract-figure {
  width: 100%;
  margin: 4px 0 0;
  border-radius: 2px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--line);
}

.abstract-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

.abstract-figure figcaption {
  padding: 0.65rem 0.8rem 0.8rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
  line-height: 1.45;
}

.contrib-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.contrib-card {
  padding: 18px 18px 16px;
  border-radius: 10px;
  border: 1px solid rgba(0,0,0,0.04);
}

.contrib-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.58;
}

.card-a { background: #f4effb; }
.card-b { background: #eef6fd; }
.card-c { background: #f8f3ed; }

.video-box {
  width: min(100%, 980px);
  margin: 18px auto 0;
  border-radius: 2px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.15);
}

.video-box video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  background: #000;
  object-fit: contain;
}

.video-box figcaption {
  padding: 0.65rem 0.8rem 0.8rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}

.checkpoint {
  margin-top: 0;
  font-size: 1rem;
  font-weight: 400;
}

.bibtex-wrap { position: relative; }

pre {
  margin: 0;
  padding: 18px;
  overflow-x: auto;
  background: #f8f8f8;
  font-size: 0.86rem;
  line-height: 1.5;
}

.copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 8px;
  border: 1px solid #d8d8dc;
  border-radius: 5px;
  background: #fff;
  color: #444;
  cursor: pointer;
  font-size: 0.78rem;
}

footer {
  margin-top: 54px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: #777;
  text-align: center;
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .abstract-layout,
  .contrib-grid {
    grid-template-columns: 1fr;
  }
  .affiliation { line-height: 1.6; }
}

@media (max-width: 650px) {
  main { margin-top: 36px; padding: 0 16px; }
  h1 { font-size: 2.05rem; }
  .authors { font-size: 1rem; }
  .button { flex: 1 1 40%; }
}