:root {
  --bg: #ffffff;
  --text: #17212b;
  --muted: #52606d;
  --line: #d9e2ec;
  --card: #f7f9fc;
  --accent: #0b5fff;
  --max: 900px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
}
.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}
.brand {
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.hero {
  padding: 4.25rem 0 2.5rem;
}
.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 6vw, 3.35rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
}
.lead {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 46rem;
}
.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 18px;
  padding: 1.25rem;
}
.badge {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.85rem;
  background: #fff;
}
.button-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}
.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 600;
  color: var(--text);
  background: #fff;
}
.button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
main { padding: 2rem 0 4rem; }
.section-title {
  font-size: 1.6rem;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
.muted { color: var(--muted); }
.publication-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}
.publication-list li {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0;
}
.paper-wrapper {
  padding: 2.5rem 0 4rem;
}
.paper-shell {
  max-width: 850px;
  margin: 0 auto;
}
.paper-meta-line {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}
.paper-title {
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0;
}
.paper-authors, .paper-affiliation, .paper-contact {
  font-size: 1.05rem;
  color: var(--muted);
}
.paper-authors { margin-top: 1rem; font-weight: 600; color: var(--text); }
.abstract-card {
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
  padding: 1.25rem 1.25rem 0.95rem;
}
.abstract-card h2:first-child { margin-top: 0; }
.paper-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.25rem 0 2rem;
}
.paper-shell h2 {
  margin: 2.2rem 0 0.75rem;
  font-size: 1.45rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.paper-shell p { margin: 0 0 1rem; }
.keywords, .note {
  font-size: 0.96rem;
  color: var(--muted);
}
figure {
  margin: 1.5rem 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem;
  background: #fff;
}
figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
}
figcaption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.94rem;
}
.references { padding-left: 1.15rem; }
.references li { margin-bottom: 0.8rem; }
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}
@media (max-width: 720px) {
  .nav { align-items: flex-start; padding: 0.85rem 0; }
  .nav-links { font-size: 0.95rem; }
}