:root {
  --text: #1f2933;
  --muted: #5f6c7b;
  --border: #e5e7eb;
  --bg: #ffffff;
  --soft-bg: #f7f8fa;
  --accent: #222222;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Noto Sans", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.hero {
  text-align: center;
  padding: 28px 0 32px;
}

.title {
  margin: 0 auto 18px;
  max-width: 960px;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.12;
  font-weight: 750;
  letter-spacing: -0.035em;
}

.authors {
  margin: 10px 0 4px;
  font-size: 1.2rem;
  font-weight: 600;
}

.affiliation,
.date {
  margin: 4px 0;
  color: var(--muted);
  font-size: 1rem;
}

.links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 112px;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-weight: 650;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
  opacity: 0.88;
}

.section {
  margin-top: 42px;
}

.section h2 {
  margin: 0 0 16px;
  font-size: 1.75rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-align: center;
}

.abstract {
  text-align: justify;
  font-size: 1.04rem;
}

.video-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  border-radius: 14px;
  background: var(--soft-bg);
  border: 1px solid var(--border);
}

.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.bibtex {
  margin: 0;
  padding: 18px 20px;
  background: var(--soft-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
  font-size: 0.94rem;
  line-height: 1.5;
}

.note {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}

@media (max-width: 640px) {
  .container {
    padding: 32px 18px 48px;
  }

  .hero {
    padding-top: 16px;
  }

  .abstract {
    text-align: left;
  }
}