:root {
  --primary: #2E5497;
  --accent: #E8A602;
  --bg: #ffffff;
  --text: #0f172a;
  --card: #f7f9fc;
  --border: #e5e7eb;
}

[data-theme="dark"] {
  --bg: #0c1220;
  --text: #e5e7eb;
  --card: #141b2e;
  --border: #24314b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

bi {
  font-weight:bold;
  font-style:italic;
}

hr {
  border:0;
  margin:0;
  padding:0;
  width:100%;
  height:1.2px;
  margin-top:15px;
  margin-bottom:5px;
  background-color:var(--text);
}

li {
  margin-bottom: 5px;
}

.topbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  z-index: 1000;
  border-bottom: 2px solid #cccccc;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}

.logo-mark {
  background: #fff;
  color: var(--primary);
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.logo-text {
  font-size: 1.1rem;
  max-width: 340px;
  justify-content: center;
}

.logo img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  display: block;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 1.3rem;
}

.nav-link{
  color:#fff;
  font-weight:500;
  position:relative;
  display:inline-block;
  text-decoration:none;
}

.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-6px;
  width:100%;
  height:2px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:bottom right;
  transition:transform .5s ease;
}

.nav-link:hover::after{
  transform:scaleX(1);
  transform-origin:bottom left;
}

.nav-link.active{
  color:var(--accent);
}

.nav-link.active::after{
  transform:scaleX(1);
}

.actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  background: #fff;
  color: var(--primary);
  border: none;
  margin: 0;
  padding: 4px 5px 8px 4px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
}

.lang-toggle {
  background: #fff;
  color: var(--primary);
  border: none;
  margin: 0;
  padding: 6px 6px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.lang-toggle img {
  width: 25px;
  height: 25px;
  object-fit: contain;
  display: block;
}

.hamburger {
  display: none;
  background: #fff;
  color: var(--primary);
  border: none;
  padding: 8px 10px 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
}

.page {
  margin: 0 auto;
  max-width: 1600px;
  padding: 110px 8vw 60px;
}

.hero {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: var(--card);
}

.hero img {
  width: 100%;
  display: block;
  height:400px;
}

.hero-text {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(0,0,0,0.6), rgba(0,0,0,0.1));
  color: #fff;
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
}

.image-centered {
  display:flex;
  align-items:center;
  vertical-align:-3px;
  text-decoration:none;
  width: fit-content;
}

.image-centered img {
  margin-right:6px;
}

[data-theme="dark"] .hero-text {
  background: rgba(20,27,46,0.9);
}

.black-link {
  color:var(--text);
  text-decoration:none;
}

.section {
  margin-top: 40px;
}

.section h2 {
  font-size: 1.6rem;
  margin-bottom: 14px;
  color: var(--primary);
}

/* .section h3 {
  color: var(--text);
} */

/* .grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
} */

.grid {
  gap: 16px;
  display: grid;
  align-items: stretch;
  grid-template-columns: repeat(3, minmax(0, 1fr)); 
}

.grid > .black-link {
  display: block;
  height: 100%;
  min-width: 0;
}

.grid > .black-link > .card {
  height: 100%;
}

.grid2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.card {
  padding: 20px;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: 0 6px 14px rgba(0,0,0,0.04);
}

.research-link {
  font-weight:bold;
  font-style:italic;
  margin-right:10px;
}

jt {
  font-weight:bold;
  font-style:italic;
}

jtb {
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
  font-style: italic;
  padding: 0.5px 5px 1px 5px;
  background-color: #5F5F5F;
  border-top-left-radius: 5px;
  border-bottom-left-radius: 5px;
}

ift {
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
  background-color: var(--primary);
  padding: 0.5px 5px 1px 5px;
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
}

.leader {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  align-items: start;
}

.leader-photo {
  width: 60%;
  max-width: 350px;
  height: 500px; 
  border-radius: 14px;
  padding: 0;margin: 0;
}

.leader-photo img {
  width:350px;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.leader-photo-zh {
  width: 60%;
  max-width: 350px;
  height: 500px; 
  border-radius: 14px;
  padding: 0;margin: 0;
}

.leader-photo-zh img {
  width:310px;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.leader-text {
  max-width: 1200px;
  font-size: 1.15rem;;
}

.list, .pub-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.list-item {
  display: grid;
  gap: 16px;
  background: var(--card);
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.pub-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  background: var(--card);
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  align-items: center;
}

.list-item img, .pub-item img {
  width: 120px;
  height: auto;
  border-radius: 10px;
}

.footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  color: var(--text);
  background: var(--bg);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: 0.6s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .topbar {
    padding: 14px 10px;
  }
  .nav {
    font-size: 1.1rem;
  }
  .grid,.grid2 {
    grid-template-columns: 1fr;
  }
  .leader {
    grid-template-columns: 1fr;
  }
  .hero img {
    height:100%;
  }
}

@media (max-width: 860px) {
  .theme-toggle {
    display: none;
  }
  .nav {
    top: 72px;
    gap: 12px;
    right: 18px;
    padding: 16px;
    display: none;
    position: fixed;
    border-radius: 12px;
    flex-direction: column;
    align-items: flex-start;
    background: var(--primary);
  }
  .nav.open {
    display: flex;
  }
  .nav-link {
    align-self: flex-start;
    width: fit-content;
  }
  .hamburger {
    display: block;
  }
  .hero img {
    height:100%;
  }
}

@media (max-width: 640px) {
  .list-item, .pub-item {
    grid-template-columns: 1fr;
  }
  .hero img {
    height:100%;
  }
  .hero-text h1 {
    font-size: 1.1rem;
  }
  .hero-text p {
    font-size: 0.9rem;
  }
}