:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --primary: #174ea6;
  --primary-dark: #123c80;
  --soft: #eaf1ff;
  --tag: #eef4ff;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
  --radius: 18px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 7vw;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
}

.nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
}

.nav a { color: #475467; }
.nav a:hover { color: var(--primary); text-decoration: none; }

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 24px;
}

.hero {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 44px;
  align-items: center;
  padding-top: 72px;
}

.hero-photo-wrap {
  justify-self: center;
}

.hero-photo {
  width: 230px;
  height: 230px;
  object-fit: cover;
  border-radius: 50%;
  border: 8px solid #fff;
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1, h2, h3 { line-height: 1.25; }

h1 {
  margin: 0;
  font-size: clamp(38px, 6vw, 60px);
  letter-spacing: -0.04em;
}

.cn-name {
  display: inline-block;
  margin-left: 10px;
  font-weight: 600;
  color: #475467;
  letter-spacing: 0;
}

.position {
  margin: 10px 0 0;
  font-size: 20px;
  color: #344054;
}

.position-cn {
  margin: 4px 0 22px;
  font-size: 18px;
  color: #475467;
}

.intro {
  max-width: 820px;
  font-size: 17px;
  color: #344054;
}

.cn { color: #364152; }

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(23, 78, 166, 0.18);
}

.button:hover { color: #fff; background: var(--primary-dark); text-decoration: none; }

.button.secondary {
  color: var(--primary);
  background: var(--soft);
  box-shadow: none;
}

.button.secondary:hover { color: #fff; background: var(--primary); }

.grid-2 {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.8fr);
  gap: 32px;
}

.info-card, .card, .publication, .timeline-item, .cv-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.info-card {
  padding: 24px;
}

.plain-list,
.compact-list {
  padding-left: 20px;
}

.plain-list { list-style: none; padding-left: 0; }
.plain-list li { margin: 8px 0; }
.compact-list li { margin-bottom: 10px; }
.small-note { color: var(--muted); font-size: 14px; }

h2 {
  margin: 0 0 22px;
  font-size: 30px;
  letter-spacing: -0.02em;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: baseline;
  margin-bottom: 18px;
}
.section-head p { color: var(--muted); margin: 0; }

.news-list {
  display: grid;
  gap: 10px;
}

.news-item {
  padding: 14px 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
}
.news-item span {
  display: inline-block;
  min-width: 82px;
  font-weight: 800;
  color: var(--primary);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.card-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  padding: 22px;
}
.card h3 { margin-top: 0; margin-bottom: 10px; }
.card p { margin-bottom: 0; color: #475467; }
.feature-card { min-height: 190px; }

.pub-year {
  margin: 32px 0 14px;
  color: var(--primary);
  font-size: 22px;
  font-weight: 800;
}

.publication {
  padding: 22px 24px;
  margin-bottom: 14px;
}
.publication.muted { opacity: 0.72; }
.publication h3 {
  margin: 8px 0 8px;
  font-size: 20px;
}
.authors, .venue { margin: 4px 0; color: #475467; }
.pub-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--tag);
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
}
.links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.links a {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #c7d7fe;
  background: #fff;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}
.links a:hover { background: var(--soft); text-decoration: none; }

.timeline {
  display: grid;
  gap: 16px;
}
.timeline-item {
  padding: 22px 24px;
  position: relative;
}
.timeline-item h3 { margin: 6px 0 6px; }
.timeline-item p { margin: 0; color: #475467; }
.date {
  color: var(--primary);
  font-weight: 800;
}

.cv-box {
  padding: 32px;
  margin-bottom: 40px;
}

.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 36px 24px 48px;
  border-top: 1px solid var(--line);
}
.site-footer p { margin: 4px 0; }

@media (max-width: 900px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: 10px; }
  .hero { grid-template-columns: 1fr; text-align: center; }
  .hero-actions { justify-content: center; }
  .grid-2 { grid-template-columns: 1fr; }
  .card-grid, .card-grid.two { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .section { padding: 42px 18px; }
  .nav { gap: 12px; }
  .hero-photo { width: 180px; height: 180px; }
  .card-grid, .card-grid.two { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .news-item span { display: block; min-width: 0; margin-bottom: 4px; }
}