:root {
  --ink: #101828;
  --muted: #5f6b7a;
  --line: #e4e9f0;
  --paper: #ffffff;
  --soft: #f5f8fc;
  --navy: #071321;
  --navy-2: #0d2035;
  --cyan: #2dd4ff;
  --blue: #3b82f6;
  --violet: #8b5cf6;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img, video { max-width: 100%; }
.shell { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.lang-en, .lang-zh { display: inline; }
html[data-lang="zh"] .lang-en { display: none !important; }
html[data-lang="en"] .lang-zh { display: none !important; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid rgba(228,233,240,.9);
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(14px);
}
.header-inner { min-height: 78px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; min-width: 305px; }
.brand-mark {
  width: 43px; height: 43px; display: grid; place-items: center;
  border-radius: 13px; color: white; background: linear-gradient(145deg,var(--blue),var(--violet));
  font-weight: 800; letter-spacing: .04em;
}
.brand-copy { display: flex; flex-direction: column; line-height: 1.25; }
.brand-copy strong { font-size: 15px; }
.brand-copy small { margin-top: 4px; color: var(--muted); font-size: 12px; }
.main-nav { display: flex; align-items: center; gap: 24px; margin-left: auto; }
.main-nav a { position: relative; padding: 29px 0 25px; text-decoration: none; font-size: 13px; font-weight: 650; color: #475467; white-space: nowrap; }
.main-nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 17px; height: 2px; transform: scaleX(0); background: var(--blue); transition: .2s; }
.main-nav a:hover, .main-nav a.active { color: var(--ink); }
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
.lang-toggle, .menu-toggle { border: 1px solid #d8dee8; background: white; color: var(--ink); cursor: pointer; }
.lang-toggle { padding: 7px 11px; border-radius: 999px; font-size: 12px; font-weight: 700; white-space: nowrap; }
.lang-toggle .slash { color: #adb5c2; margin: 0 4px; }
.menu-toggle { display: none; margin-left: auto; border-radius: 9px; padding: 7px 10px; font-size: 18px; }

.hero { color: white; background:
  radial-gradient(circle at 82% 18%, rgba(139,92,246,.42), transparent 31%),
  radial-gradient(circle at 66% 68%, rgba(45,212,255,.20), transparent 30%),
  linear-gradient(125deg, var(--navy), var(--navy-2));
  overflow: hidden;
}
.hero-inner { min-height: 550px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 65px; padding: 76px 0; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 18px; color: #a8eaff; font-size: 13px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 34px; height: 2px; background: var(--cyan); }
.hero h1 { margin: 0 0 22px; font-size: 72px; line-height: 1.05; letter-spacing: 0; }
.hero p { max-width: 700px; margin: 0 0 30px; color: #c8d5e5; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 19px; border-radius: 10px; text-decoration: none; font-size: 14px; font-weight: 750; transition: transform .2s, box-shadow .2s; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: #06111d; background: var(--cyan); box-shadow: 0 10px 28px rgba(45,212,255,.22); }
.button.ghost { color: white; border: 1px solid rgba(255,255,255,.26); background: rgba(255,255,255,.05); }
.hero-visual { position: relative; min-height: 380px; display: grid; place-items: center; }
.orbit { position: absolute; border: 1px solid rgba(111,225,255,.28); border-radius: 50%; }
.orbit.one { width: 350px; height: 350px; }
.orbit.two { width: 270px; height: 270px; }
.orbit.three { width: 185px; height: 185px; border-color: rgba(183,138,255,.42); }
.core { position: relative; z-index: 2; width: 180px; height: 180px; border-radius: 36px; display: grid; place-items: center; text-align: center; background: linear-gradient(145deg,rgba(59,130,246,.95),rgba(139,92,246,.93)); box-shadow: 0 30px 80px rgba(0,0,0,.35); }
.core strong { display:block; font-size: 50px; line-height: 1; }
.core span { display:block; margin-top: 9px; font-size: 12px; letter-spacing: .15em; text-transform: uppercase; }
.float-label { position: absolute; z-index: 3; padding: 9px 13px; border: 1px solid rgba(255,255,255,.14); border-radius: 10px; color: #dbeafe; background: rgba(4,14,26,.78); font-size: 12px; box-shadow: 0 16px 40px rgba(0,0,0,.24); }
.float-label.a { top: 40px; right: 22px; }
.float-label.b { bottom: 55px; left: 0; }
.float-label.c { bottom: 22px; right: 55px; }
.float-label.d { top: 70px; left: 35px; }

.page-hero { padding: 88px 0 68px; color: white; background: linear-gradient(135deg,var(--navy),#102b49); }
.page-hero .eyebrow { margin-bottom: 13px; }
.page-hero h1 { max-width: 900px; margin: 0 0 16px; font-size: 56px; line-height: 1.12; letter-spacing: 0; }
.page-hero p { max-width: 790px; margin: 0; color: #c7d4e4; font-size: 17px; }

.section { padding: 80px 0; }
.section.soft { background: var(--soft); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 35px; }
.section-head h2 { margin: 0; font-size: 40px; line-height: 1.2; letter-spacing: 0; }
.section-head p { max-width: 600px; margin: 0; color: var(--muted); }
.text-link { color: #185bd4; font-weight: 750; text-decoration: none; white-space: nowrap; }
.text-link:hover { text-decoration: underline; }
.card-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 20px; }
.highlight-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
.card { position: relative; min-height: 235px; padding: 27px; border: 1px solid var(--line); border-radius: 18px; background: white; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: linear-gradient(90deg,var(--blue),var(--violet)); }
.card .number { color: #98a2b3; font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.card h3 { margin: 34px 0 12px; font-size: 20px; line-height: 1.35; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.feature-grid { display: grid; grid-template-columns: 1.18fr .82fr; gap: 42px; align-items: center; }
.video-frame { overflow: hidden; border-radius: 18px; background: #020914; box-shadow: 0 26px 70px rgba(16,24,40,.18); }
.video-frame video { display: block; width: 100%; aspect-ratio: 16/9; object-fit: contain; }
.feature-copy h2 { margin: 0 0 18px; font-size: 42px; line-height: 1.18; }
.feature-copy p { color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 27px; }
.tag { padding: 6px 11px; border-radius: 999px; color: #2852a6; background: #eef4ff; font-size: 12px; font-weight: 700; }

.profile-band { display: grid; grid-template-columns: 330px 1fr; gap: 55px; align-items: center; }
.profile-image { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 24px; background: #eef1f5; }
.profile-copy h2 { margin: 0 0 6px; font-size: 42px; }
.profile-copy .role { margin-bottom: 20px; color: #2852a6; font-weight: 750; }
.profile-copy p { color: var(--muted); }
.meta-list { display: grid; gap: 11px; margin: 24px 0; }
.meta-list div { display: grid; grid-template-columns: 125px 1fr; gap: 16px; padding-bottom: 11px; border-bottom: 1px solid var(--line); font-size: 14px; }
.meta-list strong { color: var(--ink); }
.meta-list span { color: var(--muted); }

.research-list { display: grid; gap: 24px; }
.research-item { display: grid; grid-template-columns: 80px 1fr; gap: 28px; padding: 35px; border: 1px solid var(--line); border-radius: 18px; background: white; }
.research-icon { width: 68px; height: 68px; display: grid; place-items: center; border-radius: 18px; color: white; background: linear-gradient(145deg,var(--blue),var(--violet)); font-size: 24px; font-weight: 800; }
.research-item h2 { margin: 0 0 9px; font-size: 25px; }
.research-item p { margin: 0; color: var(--muted); }
.pipeline { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; counter-reset: flow; }
.pipeline div { position: relative; padding: 22px; border-radius: 14px; color: white; background: #0b1b2d; }
.pipeline div::before { counter-increment: flow; content: "0" counter(flow); display:block; margin-bottom: 24px; color: var(--cyan); font-size: 12px; font-weight: 800; }
.pipeline strong { display:block; margin-bottom:7px; }
.pipeline span { color:#b9c7d8; font-size:13px; }


.team-list { display: grid; gap: 34px; }
.team-member { display: grid; grid-template-columns: 330px 1fr; gap: 55px; align-items: center; padding: 34px; border: 1px solid var(--line); border-radius: 24px; background: #fff; }
@media (max-width: 850px) { .team-member { grid-template-columns: 1fr; padding: 24px; } .team-member .profile-image { max-width: 330px; } }

.project-hero-card { display: grid; grid-template-columns: 1.2fr .8fr; gap: 38px; align-items: center; padding: 30px; border: 1px solid var(--line); border-radius: 22px; background: white; }
.project-copy h2 { margin: 0 0 12px; font-size: 31px; line-height: 1.25; }
.project-copy p { color: var(--muted); }
.work-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 14px; margin-top: 28px; }
.work-card { padding: 20px 17px; border: 1px solid var(--line); border-radius: 15px; background: white; }
.work-card strong { display:block; margin-bottom: 8px; font-size: 17px; }
.work-card small { display:block; color: #2852a6; font-weight: 750; }
.work-card p { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

.application-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 20px; margin: 0 0 34px; }
.two-card-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
.application-card { padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 18px 46px rgba(16,24,40,.05); }
.application-card strong { display: block; margin-bottom: 12px; color: var(--ink); font-size: 19px; line-height: 1.35; }
.application-card p { margin: 0; color: var(--muted); font-size: 14px; }

.embodied-showcase { background: #fff; }
.slide-gallery { display: grid; grid-template-columns: 1fr; gap: 26px; }
.slide-figure { margin: 0; padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 18px 46px rgba(16,24,40,.06); }
.slide-figure a { display: block; overflow: hidden; border-radius: 12px; background: #eef4f8; }
.slide-figure img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: contain; }
.slide-figure figcaption { margin-top: 10px; color: var(--muted); font-size: 12px; text-align: right; }

.publication-tools { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.year-link { padding: 8px 13px; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-size: 13px; font-weight: 750; }
.year-link:hover { border-color: var(--blue); color: var(--blue); }
.pub-year { margin: 56px 0 20px; font-size: 30px; }
.pub-list { display: grid; gap: 0; }
.pub-item { padding: 21px 0; border-top: 1px solid var(--line); color: #3f4a5a; font-size: 14px; }
.pub-item strong { color: var(--ink); font-size: 15px; }
.pub-item .venue { color: #2852a6; font-style: normal; font-weight: 750; }
.note { color: var(--muted); font-size: 13px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.panel { padding: 31px; border: 1px solid var(--line); border-radius: 18px; background: white; }
.panel h2, .panel h3 { margin-top: 0; }
.panel p, .panel li { color: var(--muted); }
.clean-list { margin: 0; padding-left: 20px; }
.clean-list li { margin-bottom: 10px; }
.contact-card { padding: 40px; border-radius: 22px; color: white; background: linear-gradient(135deg,var(--navy),#173f68); }
.contact-card h2 { margin-top: 0; font-size: 33px; }
.contact-card p { color: #c7d4e4; }
.contact-card a { color: var(--cyan); font-weight: 750; }

.site-footer { padding: 42px 0; border-top: 1px solid var(--line); background: #fbfcfe; }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; }
.site-footer strong { font-size: 14px; }
.site-footer p, .site-footer span, .site-footer a { color: var(--muted); font-size: 12px; }
.footer-contact { display: flex; flex-direction: column; align-items: flex-end; gap: 7px; }

@media (max-width: 1000px) {
  .brand { min-width: auto; }
  .main-nav { position: absolute; top: 78px; left: 20px; right: 20px; display: none; padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: white; box-shadow: 0 18px 45px rgba(16,24,40,.12); }
  .main-nav.open { display: grid; grid-template-columns: repeat(3,1fr); }
  .main-nav a { padding: 12px; border-radius: 8px; }
  .main-nav a::after { display:none; }
  .main-nav a.active { background: var(--soft); }
  .menu-toggle { display: block; }
  .hero-inner, .feature-grid, .profile-band, .project-hero-card { grid-template-columns: 1fr; }
  .hero-visual { min-height: 310px; }
  .card-grid, .highlight-grid, .application-grid { grid-template-columns: repeat(2,1fr); }
  .work-grid { grid-template-columns: repeat(3,1fr); }
}
@media (max-width: 720px) {
  .shell { width: min(100% - 28px,var(--max)); }
  .header-inner { min-height: 70px; gap: 10px; }
  .brand-copy strong { font-size: 13px; }
  .brand-copy small { font-size: 11px; }
  .brand-mark { width: 38px; height: 38px; border-radius: 11px; }
  .main-nav { top: 70px; left: 14px; right: 14px; grid-template-columns: 1fr 1fr !important; }
  .hero-inner { min-height: auto; padding: 66px 0; }
  .hero-visual { display:none; }
  .hero h1 { font-size: 43px; }
  .page-hero h1 { font-size: 40px; }
  .section-head h2, .feature-copy h2, .profile-copy h2 { font-size: 32px; }
  .page-hero { padding: 60px 0 48px; }
  .section { padding: 58px 0; }
  .section-head { align-items: start; flex-direction: column; }
  .card-grid, .highlight-grid, .application-grid, .two-col, .pipeline, .work-grid { grid-template-columns: 1fr; }
  .profile-band { grid-template-columns: 1fr; }
  .profile-image { max-width: 330px; }
  .research-item { grid-template-columns: 1fr; padding: 26px; }
  .team-member { grid-template-columns: 1fr; padding: 24px; }
  .team-member .profile-image { max-width: 330px; }
  .project-hero-card { padding: 18px; }
  .application-card { padding: 22px; }
  .meta-list div { grid-template-columns: 1fr; gap: 3px; }
  .footer-grid { flex-direction: column; }
  .footer-contact { align-items:flex-start; }
}


/* Technical foundations */
.tech-gallery { display: grid; gap: 34px; }
.tech-figure { margin: 0; padding: 26px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: 0 18px 46px rgba(16,24,40,.06); }
.tech-figure-copy { display: grid; grid-template-columns: 52px 1fr; gap: 18px; align-items: start; margin-bottom: 20px; }
.tech-index { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 14px; color: #fff; background: linear-gradient(145deg,var(--blue),var(--violet)); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
.tech-figure h3 { margin: 0 0 7px; font-size: 28px; line-height: 1.25; }
.tech-figure p { margin: 0; color: var(--muted); }
.tech-image-link { display: block; overflow: hidden; border: 1px solid #d8e2ec; border-radius: 16px; background: #eef4f8; }
.tech-image { display: block; width: 100%; height: auto; transition: transform .25s ease; }
.tech-image-link:hover .tech-image { transform: scale(1.008); }
.tech-figure figcaption { margin-top: 12px; color: var(--muted); font-size: 12px; text-align: right; }