:root {
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: rgba(148, 163, 184, 0.18);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #eaf2ff;
  --maxw: 1120px;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 24px rgba(15, 23, 42, 0.05);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 28%),
    radial-gradient(circle at bottom left, rgba(59, 130, 246, 0.06), transparent 30%),
    linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.75;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.72);
}

.nav-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
}

.site-brand {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  flex-shrink: 0;
}

.site-brand-main {
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.site-brand-sub {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: flex-end;
}

.site-nav a {
  text-decoration: none;
  color: #334155;
  font-size: 0.96rem;
  font-weight: 600;
  padding: 7px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  transform: translateY(-1px);
}

.page-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 24px 88px;
}

.hero-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.96) 0%, rgba(255,255,255,0.88) 100%);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: 32px;
  box-shadow: var(--shadow);
  padding: 72px 60px;
  overflow: hidden;
  position: relative;
}

.hero-card::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -90px;
  top: -90px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.14) 0%, rgba(37, 99, 235, 0.04) 42%, rgba(37, 99, 235, 0) 72%);
  pointer-events: none;
}

.hero-card::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  left: -90px;
  bottom: -90px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.10) 0%, rgba(59, 130, 246, 0.03) 45%, rgba(59, 130, 246, 0) 72%);
  pointer-events: none;
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(3rem, 7vw, 5rem);
  line-height: 0.94;
  margin: 0;
  letter-spacing: -0.04em;
  max-width: 9ch;
}

.hero-subtitle {
  margin-top: 16px;
  font-size: 1.08rem;
  color: #334155;
  max-width: 760px;
}

.hero-tagline {
  margin-top: 30px;
  color: var(--accent-strong);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.8;
}

.section-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 28px;
  margin-top: 32px;
}

.panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: 26px;
  box-shadow: var(--shadow-soft);
  padding: 34px 32px;
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.panel p {
  margin: 0;
  color: #334155;
  font-size: 1.02rem;
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-item {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.news-item:first-child {
  border-top: none;
  padding-top: 4px;
}

.news-year {
  display: inline-block;
  min-width: 54px;
  color: var(--accent);
  font-weight: 800;
}

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

.quick-links a {
  text-decoration: none;
  color: var(--accent-strong);
  background: var(--accent-soft);
  border: 1px solid rgba(37, 99, 235, 0.09);
  border-radius: 999px;
  padding: 10px 15px;
  font-size: 0.94rem;
  font-weight: 700;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.quick-links a:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.10);
}

.page-card {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(226, 232, 240, 0.92);
  border-radius: 28px;
  box-shadow: var(--shadow-soft);
  padding: 46px 40px;
}

.page-title {
  margin: 0 0 20px;
  font-size: 2.35rem;
  letter-spacing: -0.03em;
}

.page-card h2,
.page-card h3 {
  margin-top: 34px;
  margin-bottom: 12px;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-card p,
.page-card li {
  color: #334155;
}

.pi-photo {
  width: 450px;
  height: auto;
  border-radius: 16px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-soft);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: transparent;
}

.footer-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 24px 40px;
  color: var(--muted);
  font-size: 0.92rem;
}

.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 26px;
  margin-top: 22px;
}

.member-card {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(226, 232, 240, 0.92);
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
  padding: 26px 22px;
  text-align: center;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.member-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.member-photo {
  width: 140px;
  height: 170px;
  object-fit: cover;
  border-radius: 14px;
  margin-bottom: 16px;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.member-card h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}

.member-role {
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 10px;
}

.member-card p {
  margin: 6px 0;
  color: #475569;
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  .nav-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .section-grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    padding: 50px 30px;
    border-radius: 28px;
  }

  .page-card {
    padding: 34px 24px;
  }

  .hero-title {
    max-width: none;
  }

  .pi-photo {
    width: 180px;
  }
}

.research-figure {
  margin: 2rem 0 2.5rem 0;
  text-align: center;
}

.research-image {
  width: 100%;
  max-width: 480px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}
.research-caption {
  margin-top: 0.8rem;
  font-size: 0.95rem;
  color: #4b5563;
  line-height: 1.6;
}
.member-name-zh {
  font-size: 0.9rem;
  color: #64748b;
  margin-top: -4px;
  margin-bottom: 6px;
}

.visitor-panel-small {
  margin-top: 24px;
  text-align: center;
}

.visitor-panel-small h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: #334155;
}

.visitor-map-small {
  max-width: 420px;
  margin: 0 auto;
}

.visitor-map-small img,
.visitor-map-small canvas {
  width: 100% !important;
  height: auto !important;
  border-radius: 10px;
}

.visitor-caption-small {
  font-size: 0.85rem;
  color: #94a3b8;
  margin-top: 6px;
}