:root{
  --ink:#1d1d1f; --ink2:#6e6e73; --line:#d2d2d7; --bg:#fff; --bg2:#f5f5f7;
  --accent:#0071e3; --accent-ink:#fff; --r:18px;
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* nav */
.nav{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08)}
.nav-in{display:flex;align-items:center;height:52px;gap:24px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;letter-spacing:.04em;color:var(--ink);font-size:17px}
.brand:hover{text-decoration:none}
.mark{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;background:var(--ink);color:#fff;font-size:14px}
.links{display:flex;gap:24px;margin-left:auto}
.links a{color:var(--ink);font-size:14px;opacity:.8}
.links a:hover{opacity:1;text-decoration:none}
.lang{border:1px solid var(--line);background:#fff;border-radius:999px;padding:4px 12px;font-size:13px;cursor:pointer;color:var(--ink)}
.lang:hover{border-color:var(--ink2)}

/* hero */
.hero{padding:96px 0 64px;text-align:center}
.eyebrow{color:var(--accent);font-weight:600;font-size:15px;margin-bottom:12px}
h1{font-size:clamp(34px,5.4vw,60px);line-height:1.08;letter-spacing:-.02em;font-weight:700;max-width:880px;margin:0 auto}
.lead{font-size:clamp(17px,2vw,21px);color:var(--ink2);max-width:760px;margin:20px auto 0}
.cta{display:flex;gap:12px;justify-content:center;margin-top:32px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);padding:12px 24px;border-radius:999px;font-size:16px;font-weight:500}
.btn:hover{text-decoration:none;filter:brightness(1.08)}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}

/* facts */
.facts{padding:8px 0 56px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.fact{background:var(--bg2);border-radius:var(--r);padding:24px 20px}
.fact b{display:block;font-size:34px;letter-spacing:-.02em}
.fact span{color:var(--ink2);font-size:14px}
.src{color:var(--ink2);font-size:12px;margin-top:12px}

/* sections */
.sec{padding:80px 0}
.sec.alt{background:var(--bg2)}
h2{font-size:clamp(28px,3.6vw,40px);letter-spacing:-.015em;line-height:1.15}
.sub{color:var(--ink2);font-size:18px;margin-top:8px}
h3{font-size:19px;letter-spacing:-.01em}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px}
.card{background:#fff;border:1px solid rgba(0,0,0,.06);border-radius:var(--r);padding:28px}
.alt .card{border-color:transparent}
.num{color:var(--accent);font-weight:600;font-size:14px}
.card h3{margin:8px 0 8px}
.card p{color:var(--ink2)}

.two{display:grid;grid-template-columns:1fr 1.4fr;gap:48px;align-items:start}
.list{list-style:none;background:#fff;border-radius:var(--r);overflow:hidden}
.list li{display:grid;grid-template-columns:96px 1fr;gap:16px;padding:18px 24px;border-bottom:1px solid #ececf0}
.list li:last-child{border-bottom:0}
.list b{font-weight:600}
.list span{color:var(--ink2)}
.note{margin-top:32px;background:#fff;border-radius:var(--r);padding:28px}
.note p{color:var(--ink2);margin-top:8px}

.timeline{list-style:none;margin-top:32px;border-left:2px solid var(--line);margin-left:6px}
.timeline li{position:relative;padding:0 0 28px 28px;display:grid;grid-template-columns:110px 1fr;gap:16px}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{content:"";position:absolute;left:-7px;top:6px;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--accent)}
.when{font-weight:600}
.timeline span:not(.when){color:var(--ink2)}

.people{display:grid;gap:16px;margin-top:32px}
.person{display:grid;grid-template-columns:72px 1fr;gap:20px;background:#fff;border-radius:var(--r);padding:28px}
.avatar{width:72px;height:72px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:600;font-size:22px}
.role{color:var(--accent);font-weight:500;margin:2px 0 10px}
.person p:not(.role){color:var(--ink2)}
.pubs-h{margin-top:40px}
.pubs{margin-top:12px;padding-left:20px;color:var(--ink2)}
.pubs li{margin-bottom:8px}

.rows{background:var(--bg2);border-radius:var(--r);overflow:hidden}
.rows div{display:grid;grid-template-columns:110px 1fr;gap:16px;padding:18px 24px;border-bottom:1px solid #e6e6ea}
.rows div:last-child{border-bottom:0}
.rows dt{color:var(--ink2)}

.foot{border-top:1px solid var(--line);padding:24px 0;font-size:13px;color:var(--ink2)}
.foot-in{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

@media (max-width:820px){
  .links{display:none}
  .lang{margin-left:auto}
  .grid4{grid-template-columns:repeat(2,1fr)}
  .cards,.two{grid-template-columns:1fr}
  .two{gap:24px}
  .hero{padding:64px 0 48px}
  .sec{padding:56px 0}
  .timeline li,.list li{grid-template-columns:1fr;gap:4px}
  .person{grid-template-columns:1fr}
}