:root{
  --accent:#007EBD;
  --accent-dark:#005d8c;
  --accent-glow:rgba(0,126,189,.28);
  --ink:#132b3a;
  --ink-soft:#3d5a6e;
  --muted:#6b8494;
  --bg:#f4f8fb;
  --card:#ffffff;
  --line:rgba(19,43,58,.10);
  --glass:rgba(255,255,255,.72);
  --radius:18px;
  --shadow:0 18px 50px -22px rgba(19,86,133,.35);
  --serif:Georgia,"Times New Roman","Songti SC","Noto Serif SC",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:16.5px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
.container{width:min(1180px,92%);margin:0 auto;position:relative}

.no-scroll{overflow:hidden}

/* ---------- Reveal-on-scroll ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.1s}
.reveal[data-delay="2"]{transition-delay:.2s}
.reveal[data-delay="3"]{transition-delay:.3s}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  background:rgba(255,255,255,.82);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s ease,background .3s ease;
}
.site-header.scrolled{box-shadow:0 10px 30px -18px rgba(19,86,133,.28);background:rgba(255,255,255,.94)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px;gap:18px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:700;letter-spacing:.2px}
.brand img{height:44px;width:auto}
.brand .brand-name{font-size:17px}
.brand .brand-sub{display:block;font-size:11.5px;font-weight:500;color:var(--muted);letter-spacing:1.4px;text-transform:uppercase}
.nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav a.nav-link{
  color:var(--ink-soft);padding:8px 13px;border-radius:10px;font-size:14.5px;font-weight:500;
  transition:color .2s,background .2s;
}
.nav a.nav-link:hover{color:var(--accent);background:rgba(0,126,189,.08)}

.lang{position:relative;margin-left:6px}
.lang-btn{
  display:inline-flex;align-items:center;gap:7px;padding:8px 13px;border-radius:10px;
  background:rgba(0,126,189,.09);color:var(--accent-dark);font-weight:700;font-size:13.5px;
  border:1px solid rgba(0,126,189,.22);cursor:pointer;font-family:inherit;
  transition:background .2s;
}
.lang-btn:hover{background:rgba(0,126,189,.16)}
.lang-btn svg{width:13px;height:13px}
.lang-menu{
  position:absolute;top:calc(100% + 6px);right:0;min-width:150px;
  background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:0 18px 40px -18px rgba(19,86,133,.3);
  opacity:0;visibility:hidden;transform:translateY(-6px);transition:all .22s ease;
}
.lang.open .lang-menu{opacity:1;visibility:visible;transform:none}
.lang-menu a{display:block;padding:10px 16px;font-size:14px;color:var(--ink);font-weight:500}
.lang-menu a:hover{background:rgba(0,126,189,.08);color:var(--accent-dark)}
.lang-menu a.active{font-weight:800;color:var(--accent)}
.lang-menu .lang-label{float:right;color:var(--muted);font-weight:500;font-size:12.5px;margin-left:12px;text-transform:uppercase;letter-spacing:.5px}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  padding:150px 0 110px;color:#fff;text-align:center;
  background:var(--ink);
}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.32;z-index:0}
.hero-shade{position:absolute;inset:0;z-index:1;background:radial-gradient(120% 120% at 50% 0%,transparent 40%,rgba(4,17,27,.55) 100%),linear-gradient(180deg,rgba(4,17,27,.35),rgba(4,17,27,.55));}
.hero .container{z-index:2}
.hero-logo{height:82px;width:auto;margin:0 auto 28px;filter:drop-shadow(0 8px 24px rgba(0,0,0,.35));animation:floatIn .9s ease both}
.hero-kicker{
  display:inline-block;font-size:13px;letter-spacing:2.5px;text-transform:uppercase;font-weight:600;
  color:#bfe6ff;background:rgba(0,126,189,.28);border:1px solid rgba(160,220,255,.35);
  border-radius:999px;padding:7px 18px;margin-bottom:26px;animation:floatIn .9s .1s ease both;
}
.hero h1{font-family:var(--serif);font-size:clamp(38px,6vw,68px);line-height:1.12;font-weight:700;letter-spacing:.3px}
.hero h1 .line{display:block;overflow:hidden}
.hero h1 .line > span{display:inline-block;transform:translateY(115%);animation:rise .9s cubic-bezier(.22,.8,.28,1) forwards}
.hero h1 .line:nth-child(1)>span{animation-delay:.25s}
.hero h1 .line:nth-child(2)>span{animation-delay:.4s}
.hero h1 .grad{
  background:linear-gradient(100deg,#7fd4ff,#38b4ff 45%,#9be0ff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.hero-sub{max-width:720px;margin:30px auto 0;font-size:clamp(16px,2vw,20px);color:#d8ecf9;animation:floatIn .9s .6s ease both}
.hero-cta{margin-top:40px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap;animation:floatIn .9s .75s ease both}
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:14px 30px;border-radius:999px;
  font-weight:700;font-size:15.5px;font-family:inherit;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s;
}
.btn svg{width:16px;height:16px}
.btn-primary{background:linear-gradient(135deg,#2ba6f0,#007EBD);color:#fff;box-shadow:0 14px 34px -12px rgba(0,126,189,.65)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 20px 42px -12px rgba(0,126,189,.75)}
.btn-ghost{background:rgba(255,255,255,.10);color:#fff;border:1px solid rgba(255,255,255,.35);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.18)}
.hero-scroll{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:3;color:#cfe9f8;font-size:12px;letter-spacing:2px;text-transform:uppercase;text-align:center}
.hero-scroll svg{display:block;margin:6px auto 0;width:20px;height:20px;animation:bounce 2s infinite}

/* ---------- Section shell ---------- */
section{position:relative;padding:104px 0}
.section-head{text-align:center;max-width:760px;margin:0 auto 64px}
.section-eyebrow{display:inline-block;font-size:12.5px;letter-spacing:2.5px;text-transform:uppercase;font-weight:700;color:var(--accent);background:rgba(0,126,189,.09);padding:6px 16px;border-radius:999px;margin-bottom:18px}
.section-title{font-family:var(--serif);font-size:clamp(30px,3.6vw,44px);line-height:1.2;color:var(--ink);margin-bottom:14px}
.section-sub{color:var(--ink-soft);font-size:17px}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.about-media{position:relative}
.about-media img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;object-fit:cover;aspect-ratio:4/4.6}
.about-media::after{content:"";position:absolute;inset:18px -18px -18px 18px;border:2px solid rgba(0,126,189,.22);border-radius:var(--radius);z-index:-1}
.about-cards{display:flex;flex-direction:column;gap:22px}
.about-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;box-shadow:0 14px 40px -26px rgba(19,86,133,.3);transition:transform .25s ease,box-shadow .25s}
.about-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.about-card.icon{display:flex;gap:18px;align-items:flex-start}
.about-card .ico{flex:0 0 52px;height:52px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#2ba6f0,#007EBD);color:#fff;box-shadow:0 10px 22px -10px rgba(0,126,189,.6)}
.about-card .ico svg{width:24px;height:24px}
.about-card h3{font-size:21px;font-family:var(--serif);margin-bottom:10px;color:var(--ink)}
.about-card p{color:var(--ink-soft);font-size:15.5px}

/* ---------- Team ---------- */
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.team-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:0 14px 40px -26px rgba(19,86,133,.3);transition:transform .25s,box-shadow .25s;text-align:center;padding:34px 28px;
}
.team-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.avatar{
  width:88px;height:88px;margin:0 auto 20px;border-radius:50%;
  background:linear-gradient(140deg,#eaf6fd,#d6ecf8);
  border:3px solid #fff;box-shadow:0 10px 26px -10px rgba(0,126,189,.45);
  display:grid;place-items:center;color:var(--accent);font-family:var(--serif);font-weight:700;font-size:30px;
}
.team-card h3{font-size:20px;color:var(--ink)}
.team-card .role{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:1px;text-transform:uppercase;margin:6px 0 14px;display:block}
.team-card .cred{font-size:13px;color:var(--muted);display:block;margin-bottom:4px}
.team-card p{color:var(--ink-soft);font-size:14.8px}

/* ---------- Services ---------- */
#services{background:linear-gradient(180deg,var(--bg),#eef6fb);}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.service-card{
  position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:40px 32px;
  box-shadow:0 14px 40px -26px rgba(19,86,133,.3);transition:transform .25s,box-shadow .25s;overflow:hidden;
}
.service-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.service-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#2ba6f0,#007EBD);opacity:.92}
.service-ico{width:62px;height:62px;border-radius:16px;display:grid;place-items:center;background:rgba(0,126,189,.10);color:var(--accent);margin-bottom:24px;transition:transform .3s}
.service-card:hover .service-ico{transform:scale(1.08) rotate(-4deg)}
.service-ico svg{width:30px;height:30px}
.service-card h3{font-size:21px;font-family:var(--serif);margin-bottom:12px}
.service-card p{color:var(--ink-soft);font-size:15.5px}

/* ---------- Portfolio ---------- */
#portfolio{background:var(--ink);color:#fff}
#portfolio .section-title{color:#fff}
#portfolio .section-sub{color:#b9d3e4}
#portfolio .section-eyebrow{background:rgba(120,200,255,.14);color:#8fd4ff}
.portfolio-grid{display:grid;grid-template-columns:repeat(6,1fr);grid-auto-rows:230px;gap:20px}
.portfolio-card{
  position:relative;border-radius:var(--radius);overflow:hidden;grid-column:span 2;
  box-shadow:0 18px 50px -30px rgba(0,0,0,.7);cursor:pointer;min-height:230px;
  text-decoration:none;color:#fff;
}
.portfolio-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .6s ease;filter:saturate(.92)}
.portfolio-card:hover img{transform:scale(1.07)}
.portfolio-card .shade{
  position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,16,26,.05) 40%,rgba(5,16,26,.86));z-index:1;
  display:flex;flex-direction:column;justify-content:flex-end;padding:26px;transition:background .3s;
}
.portfolio-card:hover .shade{background:linear-gradient(180deg,rgba(5,16,26,.12) 30%,rgba(5,16,26,.94))}
.portfolio-card h3{font-family:var(--serif);font-size:22px;margin-bottom:6px}
.portfolio-card p{font-size:13.5px;color:#cfe6f5;max-width:92%}
.portfolio-card.wide{grid-column:span 2;grid-row:span 2;min-height:480px}
.portfolio-card .tag{position:absolute;top:18px;left:18px;z-index:2;font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;background:rgba(0,126,189,.9);border-radius:999px;padding:5px 12px}

/* ---------- R&D ---------- */
.rd-intro{text-align:center;max-width:760px;margin:0 auto 56px;color:var(--ink-soft);font-size:17px}
.rd-timeline{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.rd-timeline::before{content:"";position:absolute;top:34px;left:6%;right:6%;height:2px;background:linear-gradient(90deg,transparent,rgba(0,126,189,.4),transparent)}
.rd-phase{
  position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:40px 30px 30px;
  box-shadow:0 14px 40px -26px rgba(19,86,133,.3);text-align:center;transition:transform .25s;
}
.rd-phase:hover{transform:translateY(-5px)}
.rd-step{
  width:68px;height:68px;margin:-72px auto 22px;border-radius:50%;
  background:linear-gradient(135deg,#2ba6f0,#007EBD);color:#fff;display:grid;place-items:center;
  font-family:var(--serif);font-weight:700;font-size:24px;box-shadow:0 12px 30px -10px rgba(0,126,189,.6);
  border:6px solid var(--bg);position:relative;z-index:2;
}
.rd-phase h3{font-family:var(--serif);font-size:19px;margin-bottom:12px}
.rd-phase p{color:var(--ink-soft);font-size:14.8px}

/* ---------- News ---------- */
.news-feed{display:flex;flex-direction:column;gap:26px;max-width:980px;margin:0 auto 74px}
.news-item{
  display:grid;grid-template-columns:auto 1fr;gap:26px;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;align-items:start;
  box-shadow:0 14px 40px -26px rgba(19,86,133,.28);transition:transform .25s,box-shadow .25s;
}
.news-item:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.news-ico{flex:0 0 56px;width:56px;height:56px;border-radius:14px;display:grid;place-items:center;background:rgba(0,126,189,.10);color:var(--accent)}
.news-ico.alt{background:linear-gradient(135deg,#ffd166,#f9a03f);color:#fff}
.news-ico svg{width:26px;height:26px}
.news-body h3{font-size:19px;font-family:var(--serif);margin-bottom:8px;color:var(--ink)}
.news-body p{color:var(--ink-soft);font-size:15px}
.news-body .news-date{display:inline-block;font-size:12.5px;font-weight:700;color:var(--accent);background:rgba(0,126,189,.08);border-radius:999px;padding:4px 12px;margin-bottom:10px}

.past-events-title{font-family:var(--serif);font-size:26px;color:var(--ink);text-align:center;margin:0 0 36px}
.events-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.event-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:0 14px 40px -26px rgba(19,86,133,.3);transition:transform .25s,box-shadow .25s;display:flex;flex-direction:column;
}
.event-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.event-card .ev-img{position:relative;aspect-ratio:16/10;overflow:hidden}
.event-card .ev-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.event-card:hover .ev-img img{transform:scale(1.06)}
.event-card .ev-place{
  position:absolute;bottom:0;left:0;right:0;padding:26px 18px 10px;font-size:12px;font-weight:700;letter-spacing:.5px;color:#fff;
  background:linear-gradient(180deg,transparent,rgba(5,16,26,.75));
}
.event-card .ev-body{padding:20px 22px 24px}
.event-card .ev-date{font-size:12.5px;font-weight:700;color:var(--accent);display:block;margin-bottom:8px}
.event-card p{color:var(--ink-soft);font-size:14.6px}

/* ---------- Video ---------- */
#video{
  background:linear-gradient(180deg,#eef6fb,var(--bg));
}
.video-frame{
  position:relative;max-width:880px;margin:0 auto;aspect-ratio:16/9;border-radius:20px;overflow:hidden;
  box-shadow:0 30px 80px -30px rgba(19,86,133,.45);cursor:pointer;background:var(--ink);isolation:isolate;
}
.video-frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.85;transition:transform .6s ease}
.video-frame:hover img{transform:scale(1.04)}
.video-shade{position:absolute;inset:0;background:radial-gradient(90% 90% at 50% 50%,rgba(0,126,189,.10),rgba(4,17,27,.55))}
.play-btn{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:92px;height:92px;border-radius:50%;
  background:rgba(255,255,255,.16);border:2px solid rgba(255,255,255,.5);backdrop-filter:blur(8px);
  display:grid;place-items:center;color:#fff;z-index:2;transition:transform .25s,background .25s;
}
.play-btn svg{width:34px;height:34px;margin-left:4px}
.video-frame:hover .play-btn{transform:translate(-50%,-50%) scale(1.1);background:rgba(0,126,189,.55)}
.video-caption{text-align:center;color:var(--muted);font-size:13.5px;margin-top:16px}

/* ---------- Partners ---------- */
.partner-block{margin-bottom:56px}
.partner-block:last-child{margin-bottom:0}
.partner-head{font-family:var(--serif);font-size:22px;color:var(--ink);display:flex;align-items:center;gap:14px;justify-content:center;margin-bottom:28px}
.partner-head svg{width:24px;height:24px;color:var(--accent)}
.partner-strip{
  display:flex;flex-wrap:wrap;gap:18px;justify-content:center;align-items:center;
}
.partner-logo{
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 28px;
  display:flex;align-items:center;justify-content:center;min-height:74px;
  box-shadow:0 10px 30px -22px rgba(19,86,133,.3);transition:transform .2s,box-shadow .2s;
}
.partner-logo:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.partner-logo img{max-height:42px;width:auto;max-width:190px}
.partner-logo .ph{color:var(--muted);font-size:14.5px;font-weight:600;white-space:nowrap}

/* ---------- Contact ---------- */
#contact{background:linear-gradient(180deg,var(--bg),#eef6fb)}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.contact-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:36px 30px;
  box-shadow:0 14px 40px -26px rgba(19,86,133,.3);transition:transform .25s,box-shadow .25s;text-align:center;
}
.contact-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.contact-ico{width:58px;height:58px;margin:0 auto 20px;border-radius:16px;background:linear-gradient(135deg,#2ba6f0,#007EBD);color:#fff;display:grid;place-items:center;box-shadow:0 12px 28px -12px rgba(0,126,189,.6)}
.contact-ico svg{width:26px;height:26px}
.contact-card h3{font-family:var(--serif);font-size:19px;margin-bottom:10px}
.contact-card p{color:var(--ink-soft);font-size:14.8px}
.contact-card .ct{color:var(--accent);font-weight:700;font-size:15px}
.contact-card .ct.text-ink{color:var(--ink)}

/* ---------- Footer ---------- */
.site-footer{background:#0c2231;color:#b9d3e4;padding:52px 0 34px}
.footer-inner{display:flex;justify-content:space-between;align-items:flex-start;gap:30px;flex-wrap:wrap;margin-bottom:36px}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand img{height:40px;width:auto}
.footer-brand .fb-name{color:#fff;font-weight:700;font-size:16px}
.footer-brand .fb-sub{display:block;font-size:11.5px;letter-spacing:1.5px;text-transform:uppercase;color:#7fa4ba}
.footer-links{display:flex;gap:18px;flex-wrap:wrap}
.footer-links a{color:#cfe6f5;font-size:14px;padding:6px 10px;}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.10);padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13.5px;color:#86a9bd}
.footer-bottom a{color:#bfe6ff}

/* ---------- Keyframes ---------- */
@keyframes floatIn{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:none}}
@keyframes rise{to{transform:translateY(0)}}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(7px)}}

/* ---------- Responsive ---------- */
@media(max-width:1020px){
  .about-grid{grid-template-columns:1fr;gap:44px}
  .about-media{max-width:480px;margin:0 auto}
  .team-grid,.services-grid,.events-grid,.rd-timeline,.contact-grid{grid-template-columns:1fr 1fr}
  .rd-timeline::before{display:none}
  .portfolio-grid{grid-auto-rows:200px}
}
@media(max-width:720px){
  section{padding:76px 0}
  .header-inner{height:66px}
  .nav-link{display:none}
  .brand .brand-sub{display:none}
  .hero{padding:120px 0 90px;min-height:88vh}
  .team-grid,.services-grid,.events-grid,.rd-timeline,.contact-grid{grid-template-columns:1fr}
  .portfolio-grid{grid-auto-rows:190px}
  .portfolio-card,.portfolio-card.wide{grid-column:span 6}
  .portfolio-card.wide{min-height:320px}
  .news-item{grid-template-columns:1fr}
  .news-ico{width:48px;height:48px}
  .footer-inner,.footer-bottom{flex-direction:column}
}
@media(max-width:480px){
  .btn{padding:13px 22px;font-size:14.5px}
  .hero-logo{height:62px}
}