:root{
  --bg:#f5f7fb;
  --paper:#ffffff;
  --ink:#132238;
  --muted:#627086;
  --line:#dfe7f1;
  --primary:#0b6b5f;
  --primary-2:#167e91;
  --accent:#f4b63f;
  --soft:#eaf6f3;
  --shadow:0 24px 70px rgba(15,45,75,.12);
  --radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  color:var(--ink);
  background:linear-gradient(180deg,#f3f8f7 0%,#f6f8fb 36%,#fff 100%);
  line-height:1.75;
}
a{color:inherit;text-decoration:none}
.hero{
  min-height:760px;
  padding:28px clamp(20px,5vw,72px) 82px;
  position:relative;
  overflow:hidden;
  background:
    radial-gradient(circle at 16% 22%,rgba(244,182,63,.24),transparent 27%),
    radial-gradient(circle at 82% 8%,rgba(22,126,145,.26),transparent 31%),
    linear-gradient(135deg,#e9f5f1 0%,#f7fbff 58%,#eff7f2 100%);
}
.hero:before{
  content:"";
  position:absolute;
  width:520px;height:520px;border-radius:50%;
  right:-160px;top:120px;
  background:linear-gradient(135deg,rgba(11,107,95,.16),rgba(244,182,63,.14));
  filter:blur(3px);
}
.hero:after{
  content:"AI · Machine Learning · Data Mining";
  position:absolute;
  left:6vw;bottom:8px;
  font-weight:900;
  letter-spacing:.08em;
  font-size:clamp(34px,7vw,106px);
  color:rgba(19,34,56,.045);
  white-space:nowrap;
}
.navbar{
  position:relative;z-index:3;
  display:flex;align-items:center;justify-content:space-between;
  max-width:1180px;margin:0 auto;
  padding:14px 18px;
  background:rgba(255,255,255,.68);
  border:1px solid rgba(255,255,255,.78);
  backdrop-filter:blur(16px);
  box-shadow:0 16px 42px rgba(31,66,87,.08);
  border-radius:999px;
}
.brand{display:flex;align-items:center;gap:12px;font-size:16px}
.brand-mark{
  width:42px;height:42px;border-radius:14px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  color:#fff;font-weight:900;
}
.brand small{display:block;color:var(--muted);font-size:12px;margin-top:-4px}
.nav-links{display:flex;align-items:center;gap:24px;color:#395068;font-size:15px}
.nav-links a{position:relative}
.nav-links a:after{
  content:"";position:absolute;left:0;right:0;bottom:-8px;height:2px;
  background:var(--primary);transform:scaleX(0);transition:.2s;
}
.nav-links a:hover:after{transform:scaleX(1)}
.nav-toggle{display:none;background:none;border:0;font-size:28px;color:var(--ink)}
.hero-inner{
  position:relative;z-index:2;
  max-width:1180px;margin:92px auto 0;
  display:grid;grid-template-columns:1.15fr .85fr;gap:42px;align-items:center;
}
.eyebrow{
  margin:0 0 12px;
  color:var(--primary);
  font-weight:800;
  letter-spacing:.12em;
  text-transform:uppercase;
  font-size:13px;
}
h1,h2,h3,p{margin-top:0}
h1{
  margin-bottom:14px;
  font-size:clamp(48px,8vw,86px);
  line-height:1.05;
  letter-spacing:-.05em;
}
h1 span{font-size:.45em;color:var(--primary);letter-spacing:0;vertical-align:middle}
.hero-subtitle{font-size:22px;color:#31475f;font-weight:700;margin-bottom:22px}
.hero-text{font-size:19px;color:#34475c;max-width:760px}
.hero-text span{
  color:var(--primary);
  font-weight:900;
  padding:0 4px;
  background:linear-gradient(180deg,transparent 60%,rgba(244,182,63,.34) 0);
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin:30px 0 28px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:0 22px;border-radius:999px;
  border:1px solid transparent;font-weight:800;
  transition:transform .2s,box-shadow .2s,background .2s;
}
.btn:hover{transform:translateY(-2px)}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 16px 36px rgba(11,107,95,.22)}
.btn.ghost{background:rgba(255,255,255,.72);border-color:#dce8ec;color:var(--primary)}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px}
.hero-tags span{
  padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.72);
  color:#3f536a;border:1px solid rgba(210,226,232,.9);font-size:13px;font-weight:700;
}
.profile-card{
  padding:22px;
  background:rgba(255,255,255,.78);
  border:1px solid rgba(255,255,255,.9);
  border-radius:32px;
  box-shadow:var(--shadow);
}
.avatar{
  width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:26px;
  border:8px solid #fff;box-shadow:0 18px 38px rgba(31,66,87,.12);
}
.profile-info{padding:20px 6px 0}
.profile-info h2{font-size:24px;margin-bottom:10px}
.profile-info p{color:var(--muted);margin-bottom:18px}
dl{margin:0}
dl div{display:grid;grid-template-columns:72px 1fr;gap:10px;padding:9px 0;border-top:1px solid var(--line)}
dt{color:var(--muted)}
dd{margin:0;font-weight:700}
main{position:relative;z-index:2}
.section{
  max-width:1180px;margin:0 auto;
  padding:76px clamp(20px,4vw,36px);
}
.section-heading{display:grid;grid-template-columns:260px 1fr;gap:36px;align-items:start;margin-bottom:28px}
.section-heading h2,.card h2,.recruiting h2,.contact-card h2{font-size:clamp(30px,4vw,48px);line-height:1.15;margin-bottom:12px;letter-spacing:-.03em}
.section-heading.center{display:block;text-align:center;max-width:760px;margin:0 auto 32px}
.section-heading.center p:not(.eyebrow){color:var(--muted);font-size:18px}
.card{
  background:var(--paper);
  border:1px solid var(--line);
  box-shadow:0 18px 58px rgba(19,34,56,.07);
  border-radius:var(--radius);
  padding:34px;
}
.intro-content p{font-size:18px;color:#34475c}
.stats{
  padding-top:18px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
}
.stat-card{
  padding:28px 22px;border-radius:24px;background:#fff;border:1px solid var(--line);
  box-shadow:0 16px 46px rgba(19,34,56,.06);
}
.stat-card strong{display:block;font-size:44px;line-height:1;color:var(--primary);letter-spacing:-.04em}
.stat-card span{display:block;margin-top:12px;color:var(--muted);font-weight:800}
.stat-card.highlight{background:linear-gradient(135deg,#173d44,#0b6b5f);color:#fff}
.stat-card.highlight strong,.stat-card.highlight span{color:#fff}
.two-column{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.timeline{position:relative;display:grid;gap:22px}
.timeline div{padding-left:22px;border-left:3px solid var(--primary)}
.timeline time{font-weight:900;color:var(--primary)}
.timeline h3{margin:4px 0 2px}
.timeline p{color:var(--muted);margin:0}
.clean-list{padding-left:20px;margin:0;display:grid;gap:12px;color:#34475c}
.research-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.research-card{
  position:relative;overflow:hidden;min-height:250px;
  padding:32px;border-radius:28px;background:#fff;border:1px solid var(--line);
  box-shadow:0 16px 46px rgba(19,34,56,.06);
}
.research-card:before{
  content:"";position:absolute;right:-42px;top:-42px;width:150px;height:150px;border-radius:50%;
  background:rgba(11,107,95,.09);
}
.research-card span{
  display:inline-grid;place-items:center;width:48px;height:48px;border-radius:16px;
  background:var(--soft);color:var(--primary);font-weight:900;margin-bottom:24px;
}
.research-card h3{font-size:23px;margin-bottom:10px}
.research-card p{color:var(--muted)}
.publication-toolbar{
  display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:24px;
}
.filter{
  border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 16px;
  cursor:pointer;color:#41566d;font-weight:800;
}
.filter.active,.filter:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.publications-list{
  display:grid;grid-template-columns:repeat(2,1fr);gap:18px;
}
.publication{
  background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;
  box-shadow:0 14px 40px rgba(19,34,56,.055);
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.publication:hover{transform:translateY(-3px);box-shadow:0 22px 56px rgba(19,34,56,.10);border-color:rgba(11,107,95,.26)}
.publication.featured{border-color:rgba(244,182,63,.75)}
.pub-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.pub-meta span{
  padding:5px 9px;border-radius:999px;background:#f1f5f9;color:#52667e;font-size:12px;font-weight:900;
}
.pub-meta .venue{background:var(--soft);color:var(--primary)}
.publication h3{font-size:18px;line-height:1.42;margin-bottom:10px}
.authors{color:#34475c;margin-bottom:8px}
.authors strong{color:var(--primary)}
.note{color:var(--muted);font-size:14px;margin-bottom:14px}
.tag{
  display:inline-block;padding:6px 10px;border-radius:12px;
  background:rgba(244,182,63,.16);color:#7a570e;font-weight:900;font-size:13px;
}
.recruiting{padding-top:40px}
.recruiting-card{
  position:relative;overflow:hidden;
  border-radius:34px;padding:46px;
  background:linear-gradient(135deg,#0f3f46 0%,#0b6b5f 56%,#167e91 100%);
  color:#fff;box-shadow:0 28px 80px rgba(11,107,95,.22);
}
.recruiting-card:after{
  content:"JOIN US";position:absolute;right:24px;top:4px;
  font-size:92px;font-weight:900;letter-spacing:.08em;color:rgba(255,255,255,.08);
}
.recruiting-card .eyebrow{color:#fee3a3}
.recruiting-card h2{max-width:800px}
.lead{font-size:19px;color:rgba(255,255,255,.86);max-width:880px}
.recruiting-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px;
}
.recruiting-grid article{
  padding:22px;border-radius:22px;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.18);backdrop-filter:blur(10px);
}
.recruiting-grid h3{margin-bottom:8px}
.recruiting-grid p{color:rgba(255,255,255,.82);font-size:15px;margin:0}
.recruiting-note{
  position:relative;z-index:1;margin:28px 0 0;
  padding:16px 18px;border-radius:18px;background:rgba(255,255,255,.14);
  color:#fff;font-weight:800;
}
.contact-section{padding-top:40px}
.contact-card{
  display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center;
}
.contact-lines{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.contact-lines a,.contact-lines span{
  border:1px solid var(--line);padding:10px 14px;border-radius:999px;background:#fafcff;
  font-weight:800;color:#34475c;
}
.qr{
  width:180px;max-width:100%;border-radius:20px;border:1px solid var(--line);
  padding:10px;background:#fff;
}
footer{
  max-width:1180px;margin:0 auto;padding:30px clamp(20px,4vw,36px) 52px;
  color:var(--muted);display:flex;justify-content:space-between;gap:20px;
}
footer a{font-weight:900;color:var(--primary)}
.hidden{display:none!important}
@media (max-width:920px){
  .navbar{border-radius:24px;align-items:flex-start}
  .nav-toggle{display:block}
  .nav-links{
    display:none;position:absolute;left:18px;right:18px;top:72px;
    flex-direction:column;align-items:flex-start;gap:10px;
    padding:18px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);
  }
  .nav-links.open{display:flex}
  .hero-inner,.section-heading,.two-column,.contact-card{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .research-grid,.recruiting-grid,.publications-list{grid-template-columns:1fr}
  .hero{min-height:auto;padding-bottom:56px}
  .hero-inner{margin-top:52px}
}
@media (max-width:560px){
  .stats{grid-template-columns:1fr}
  .section{padding-top:54px;padding-bottom:54px}
  .card,.recruiting-card{padding:26px}
  .hero-actions .btn{width:100%}
  footer{flex-direction:column}
}
@media print{
  .navbar,.hero-actions,.publication-toolbar,.qr,footer{display:none}
  body{background:#fff;color:#000}
  .hero{min-height:auto;padding:20px;background:#fff}
  .hero-inner,.two-column,.research-grid,.publications-list,.recruiting-grid{display:block}
  .card,.publication,.research-card,.recruiting-card,.profile-card{box-shadow:none;border:1px solid #ddd;break-inside:avoid;margin-bottom:14px}
  .recruiting-card{color:#000;background:#fff}
  .recruiting-card *{color:#000!important}
}