/* --- Base --- */
* { box-sizing: border-box; }

:root {
  --primary: #1e3a5f;
  --primary-light: #3a6aa0;
  --accent: #b5651d;
  --text: #222;
  --muted: #6b7280;
  --bg: #ffffff;
  --card: #ffffff;
  --border: #e5e7eb;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}

a:hover { color: var(--accent); text-decoration: underline; }

/* --- Layout --- */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

header.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-title {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.01em;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
}

nav a {
  color: #444;
  font-size: 15px;
  font-weight: 500;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
}

nav a:hover { color: var(--primary); text-decoration: none; border-bottom-color: var(--primary); }

nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

main { padding-bottom: 80px; }

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  background: #fff;
}

/* --- Headings --- */
h1, h2, h3 {
  font-family: Georgia, "Times New Roman", serif;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 34px;
  font-weight: 700;
  margin: 0 0 10px 0;
  color: var(--primary);
  line-height: 1.2;
}

h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 44px 0 16px 0;
  color: var(--primary);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 20px 0 8px 0;
  color: var(--text);
}

p { margin: 0 0 14px 0; }

/* --- Hero --- */
.hero {
  padding: 50px 0 40px 0;
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  display: flex;
  gap: 44px;
  align-items: center;
  flex-wrap: wrap;
}

.hero img.profile-photo {
  width: 180px;
  height: 220px;
  border-radius: 4px;
  object-fit: cover;
  background: #f0f0f0;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.hero-text { flex: 1; min-width: 280px; }

.hero .subtitle {
  font-size: 17px;
  color: var(--muted);
  margin-bottom: 6px;
}

.affiliation {
  color: var(--muted);
  font-size: 15px;
  margin: 6px 0 16px 0;
}

.contact-links {
  margin-top: 16px;
  font-size: 15px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--primary);
  font-weight: 500;
  font-size: 14px;
}

.contact-links a:hover {
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  border-color: var(--primary);
}

/* --- Research theme cards (uniform) --- */
.themes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 20px 0 10px 0;
}

.theme-card {
  padding: 22px 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: transform 0.15s, box-shadow 0.15s;
}

.theme-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
}

.theme-card .icon {
  font-size: 22px;
  margin-bottom: 6px;
  display: block;
  color: var(--accent);
}

.theme-card h3 {
  margin: 0 0 8px 0;
  font-size: 17px;
  color: var(--primary);
}

.theme-card p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

/* --- Publications --- */
.pub {
  margin: 0 0 18px 0;
  padding: 12px 0 14px 0;
  border-bottom: 1px solid var(--border);
}

.pub:last-child { border-bottom: none; }

.pub-title {
  font-weight: 600;
  color: var(--primary);
  font-size: 16px;
  line-height: 1.4;
  margin-bottom: 4px;
}

.pub-title a { color: inherit; }
.pub-title a:hover { color: var(--accent); text-decoration: none; }

.pub-authors {
  color: #333;
  font-size: 14.5px;
}

.pub-authors .me { font-weight: 700; }

.pub-venue {
  color: var(--muted);
  font-style: italic;
  font-size: 14.5px;
}

.pub-links {
  margin-top: 6px;
  font-size: 13px;
}

.pub-links a {
  display: inline-block;
  margin-right: 6px;
  padding: 2px 10px;
  border: 1px solid var(--border);
  color: var(--primary);
  border-radius: 3px;
  font-weight: 500;
  background: #fff;
}

.pub-links a:hover { background: var(--primary); color: #fff; text-decoration: none; border-color: var(--primary); }

.pub-tag {
  display: inline-block;
  font-size: 11px;
  background: #e5e5e5;
  color: #555;
  padding: 1px 8px;
  border-radius: 3px;
  margin-left: 6px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  vertical-align: middle;
}

.year-heading {
  font-family: Georgia, serif;
  font-size: 20px;
  font-weight: 700;
  margin: 30px 0 10px 0;
  color: var(--primary);
}

/* --- Software 3-column grid (uniform) --- */
.software-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.software-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s, box-shadow 0.15s;
}

.software-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.07);
}

.software-header {
  padding: 16px 18px 12px 18px;
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.software-item h3 {
  margin: 0 0 6px 0;
  font-size: 19px;
  color: var(--primary);
  font-family: Georgia, serif;
}

.software-item .tag {
  display: inline-block;
  font-size: 11px;
  color: var(--muted);
  padding: 0;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.software-body {
  padding: 14px 18px 16px 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.software-body p {
  font-size: 14px;
  color: #333;
  line-height: 1.55;
  flex: 1;
}

.software-links {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.software-links a {
  font-size: 13px;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--primary);
  font-weight: 500;
  background: #fff;
}

.software-links a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  text-decoration: none;
}

/* --- News --- */
.news-item {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.news-item:last-child { border-bottom: none; }

.news-date {
  flex-shrink: 0;
  width: 100px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  padding-top: 2px;
  font-variant-numeric: tabular-nums;
}

.news-text { flex: 1; font-size: 15px; }

.news-text strong { color: var(--primary); }

.news-links {
  margin-top: 4px;
  font-size: 13px;
}

.news-links a {
  display: inline-block;
  margin-right: 6px;
  padding: 2px 10px;
  border: 1px solid var(--border);
  color: var(--primary);
  border-radius: 3px;
  font-weight: 500;
  background: #fff;
}

.news-links a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  text-decoration: none;
}

.site-title .name-cn {
  font-weight: 400;
  margin-left: 0.25em;
  opacity: 0.75;
}

/* --- Responsive --- */
@media (max-width: 800px) {
  .themes, .software-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .hero-inner { flex-direction: column; text-align: center; gap: 20px; }
  .hero img.profile-photo { width: 150px; height: 150px; }
  .contact-links { justify-content: center; }
  header .container { flex-direction: column; align-items: flex-start; }
  nav ul { gap: 16px; }
  h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  .themes, .software-grid { grid-template-columns: 1fr; }
  .news-item { flex-direction: column; gap: 4px; }
  .news-date { width: auto; }
}