:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f6f8;
  --color-text: #1a1a1a;
  --color-muted: #6b7280;
  --color-accent: #2563eb;
  --max-width: 1040px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  border-bottom: 1px solid #eaeaea;
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav a {
  margin-left: 24px;
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav a:hover {
  color: var(--color-text);
}

.hero {
  padding: 96px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin: 0 0 24px;
}

.subtitle {
  color: var(--color-muted);
  font-size: 1.1rem;
  margin: 0 0 32px;
}

.authors {
  font-size: 1.05rem;
  margin: 0 0 12px;
}

.author {
  font-weight: 600;
}

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

.affiliations span {
  margin: 0 10px;
}

.note {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin: 0 0 16px;
}

.emails {
  font-size: 0.9rem;
  margin: 0 0 20px;
}

.emails a {
  color: var(--color-accent);
  text-decoration: none;
}

.venue-badge {
  display: inline-block;
  background: var(--color-bg-alt);
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  margin: 0 0 32px;
}

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

.btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
}

.btn:hover {
  opacity: 0.9;
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section h2 {
  font-size: 1.75rem;
  margin: 0 0 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-bg);
  border: 1px solid #eaeaea;
  border-radius: 8px;
  padding: 24px;
}

.card h3 {
  margin-top: 0;
}

.bibtex {
  background: var(--color-bg);
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 20px 24px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

.site-footer {
  padding: 32px 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
  border-top: 1px solid #eaeaea;
}