/* ============ TOKENS ============ */
:root{
  --navy-0:#060f2e;
  --navy-1:#0a1a4a;
  --navy-2:#12296b;
  --navy-3:#1d3f93;
  --bloom:#3f63c8;
  --serif-blue:#a9c0f5;   /* soft headline blue on dark */
  --ink:#0c1b33;          /* dark text on light */
  --ink-serif:#16306e;    /* serif headline on light */
  --muted:#5d6b86;
  --muted-d:rgba(225,232,250,.72);  /* body on dark */
  --line:#e4e9f2;
  --line-d:rgba(255,255,255,.14);
  --light:#f5f7fc;
  --white:#fff;
  --accent:#2f6fe0;
  --maxw:1200px;
  --serif:'Instrument Serif','Noto Serif SC','Songti SC',Georgia,serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:72px;}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--white);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 32px;}
em{font-style:italic;}

.kicker{font-family:var(--sans);font-size:12px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);margin:0 0 8px;}
.kicker-light{color:rgba(190,205,245,.7);}

/* ============ HEADER ============ */
.site-header{position:fixed;top:0;left:0;right:0;z-index:60;transition:background .3s,box-shadow .3s,border-color .3s;border-bottom:1px solid transparent;}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:88px;gap:28px;position:relative;}
.brand{display:flex;align-items:center;gap:10px;}
.brand-mark{width:44px;height:auto;transition:filter .3s;}
.brand-text{font-family:var(--sans);font-weight:600;font-size:14px;letter-spacing:.14em;color:#fff;transition:color .3s;}
.main-nav{display:flex;gap:34px;position:absolute;left:50%;transform:translateX(-50%);white-space:nowrap;}
.main-nav a{font-size:14.5px;font-weight:500;color:rgba(255,255,255,.8);letter-spacing:.04em;transition:color .25s;position:relative;}
.main-nav a:hover,.main-nav a.nav-current{color:#fff;}
.main-nav a.nav-current::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:1.5px;background:var(--serif-blue);}
.nav-toggle{display:none;flex-direction:column;gap:6px;background:none;border:0;cursor:pointer;padding:6px;}
.nav-toggle span{width:24px;height:1.6px;background:#fff;transition:.25s;}

/* language switch */
.lang-switch{display:inline-flex;align-items:center;gap:5px;background:none;border:1px solid rgba(255,255,255,.28);
  border-radius:999px;padding:5px 12px;cursor:pointer;font-family:var(--sans);font-size:13px;font-weight:600;
  letter-spacing:.04em;color:rgba(255,255,255,.6);transition:border-color .25s,color .25s,background .25s;margin-left:auto;}
.lang-switch:hover{border-color:rgba(255,255,255,.55);}
.lang-switch .lang-sep{color:rgba(255,255,255,.35);font-weight:400;}
.lang-switch .lang-opt{transition:color .25s;}
.lang-switch .lang-opt.active{color:#fff;}
.site-header.scrolled .lang-switch{border-color:var(--line);color:var(--muted);}
.site-header.scrolled .lang-switch:hover{border-color:var(--accent);}
.site-header.scrolled .lang-switch .lang-sep{color:rgba(12,27,51,.3);}
.site-header.scrolled .lang-switch .lang-opt.active{color:var(--ink);}

/* scrolled => light header */
.site-header.scrolled{background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(16px);border-bottom-color:var(--line);box-shadow:0 1px 24px rgba(12,27,51,.06);}
.site-header.scrolled .brand-text{color:var(--ink);}
.site-header.scrolled .brand-mark{filter:none;}
.site-header.scrolled .main-nav a{color:var(--muted);}
.site-header.scrolled .main-nav a:hover,.site-header.scrolled .main-nav a.nav-current{color:var(--ink);}
.site-header.scrolled .main-nav a.nav-current::after{background:var(--accent);}
.site-header.scrolled .nav-toggle span{background:var(--ink);}

/* ============ HERO ============ */
.hero{position:relative;min-height:100vh;display:flex;flex-direction:column;justify-content:center;
  background:linear-gradient(160deg,var(--navy-0) 0%,var(--navy-1) 38%,var(--navy-2) 100%);
  color:#fff;overflow:hidden;padding:120px 0 0;}
.hero-atmos{position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(60% 50% at 78% 22%, rgba(86,120,224,.55), transparent 60%),
    radial-gradient(45% 40% at 18% 75%, rgba(58,90,200,.40), transparent 65%),
    radial-gradient(35% 30% at 60% 90%, rgba(120,150,255,.22), transparent 70%);
  filter:blur(8px);}
.hero-atmos{animation:atmosDrift 26s ease-in-out infinite alternate;}
.hero-atmos::after,.dark-atmos::after{content:"";position:absolute;inset:-10%;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='760' height='760'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.009' numOctaves='2' seed='11' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.36 0 0 0 0 0.5 0 0 0 0 0.95 0 0 0 0.7 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:760px 760px;opacity:.14;mix-blend-mode:screen;
  -webkit-mask-image:radial-gradient(120% 100% at 50% 30%,#000,transparent 78%);
          mask-image:radial-gradient(120% 100% at 50% 30%,#000,transparent 78%);}
@keyframes atmosDrift{from{transform:translate3d(-1.5%,-1%,0) scale(1.02);}to{transform:translate3d(2%,1.5%,0) scale(1.06);}}
.hero-inner{position:relative;z-index:1;flex:1;display:flex;flex-direction:column;justify-content:center;}
.hero-eyebrow{font-family:var(--sans);font-size:13px;font-weight:600;letter-spacing:.24em;text-transform:uppercase;color:rgba(190,205,245,.85);margin:0 0 26px;}
.hero-title{font-family:var(--serif);font-weight:400;color:#fff;
  font-size:clamp(48px,9vw,128px);line-height:1.18;letter-spacing:.06em;margin:0 0 16px;}
.hero-title em{color:var(--serif-blue);}
.hero-cn{font-family:var(--serif);font-size:clamp(22px,3.4vw,38px);color:rgba(220,230,255,.9);margin:22px 0 0;letter-spacing:.08em;}
.hero-foot{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;
  padding-bottom:40px;padding-top:30px;border-top:1px solid var(--line-d);margin-top:40px;}
.hero-foot span{font-size:14px;color:rgba(220,230,255,.72);letter-spacing:.02em;}
.hero-down{font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:#fff;opacity:.85;transition:opacity .25s;}
.hero-down:hover{opacity:1;}

/* ============ BANDS ============ */
.band{position:relative;overflow:hidden;}
.band-light{background:var(--white);color:var(--ink);padding:128px 0;}
.intro{background:linear-gradient(180deg,#fbfcfe,#f5f7fc);}
.band-dark{background:linear-gradient(170deg,var(--navy-1),var(--navy-2) 55%,var(--navy-0));color:#fff;padding:140px 0;}
.dark-atmos{position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(50% 45% at 88% 12%, rgba(86,120,224,.42), transparent 62%),
    radial-gradient(48% 50% at 6% 70%, rgba(58,90,200,.34), transparent 66%);
  filter:blur(6px);}
.dark-atmos-2{background:
    radial-gradient(48% 44% at 12% 18%, rgba(86,120,224,.4), transparent 62%),
    radial-gradient(44% 46% at 92% 82%, rgba(80,110,230,.3), transparent 66%);}
.band-dark .container{position:relative;z-index:1;}

/* ============ INTRO ============ */
.intro-grid{display:grid;grid-template-columns:0.32fr 0.68fr;gap:40px;}
.intro-lead{font-family:var(--serif);font-size:clamp(22px,3vw,36px);line-height:1.8;color:var(--ink);margin:0;font-weight:400;letter-spacing:.08em;}
.intro-lead strong{color:var(--ink-serif);font-weight:400;}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:64px;padding-top:40px;border-top:1px solid var(--line);}
.stat{display:flex;flex-direction:column;gap:6px;}
.stat-num{font-family:var(--serif);font-size:clamp(32px,4vw,52px);line-height:1;color:var(--ink-serif);white-space:nowrap;}
.stat-label{font-size:13px;color:var(--muted);letter-spacing:.02em;}

/* ============ 投资布局 (services, IWC style) ============ */
.invest .kicker-light{margin-bottom:70px;}
.svc{display:grid;grid-template-columns:60px 1fr 0.92fr;gap:0 40px;align-items:start;
  padding:64px 0;border-top:1px solid var(--line-d);}
.svc:first-of-type{border-top:1px solid var(--line-d);}
.svc-idx{font-family:var(--sans);font-size:13px;font-weight:600;color:rgba(190,205,245,.6);letter-spacing:.1em;padding-top:14px;}
.svc-title{font-family:var(--serif);font-weight:400;color:var(--serif-blue);
  font-size:clamp(38px,5.4vw,76px);line-height:1.2;letter-spacing:.05em;margin:0 0 12px;}
.svc-title .en{display:block;font-size:.42em;letter-spacing:.14em;color:rgba(255,255,255,.62);margin-top:14px;}
.svc-body{padding-top:18px;}
.svc-body>p{font-size:16.5px;color:var(--muted-d);margin:0;line-height:1.75;}
.svc-body strong{color:#fff;font-weight:600;}
.tags{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 0;padding:0;}
.tags li{font-size:13px;color:rgba(225,232,250,.85);border:1px solid var(--line-d);border-radius:999px;padding:7px 16px;}
.incubate{margin-top:26px;}
.proj-feature{display:flex;flex-direction:column;gap:6px;background:linear-gradient(135deg,rgba(86,120,224,.28),rgba(120,150,255,.12));
  border:1px solid rgba(150,175,255,.3);border-radius:14px;padding:22px 24px;}
.proj-name{font-family:var(--serif);font-size:30px;color:#fff;line-height:1;letter-spacing:.12em;}
.proj-tag{font-size:13px;color:var(--serif-blue);letter-spacing:.03em;}
.proj-cta{display:inline-block;margin-top:18px;font-size:14.5px;font-weight:500;color:#fff;border-bottom:1px solid rgba(255,255,255,.4);padding-bottom:3px;transition:border-color .25s;}
.proj-cta:hover{border-color:#fff;}

/* ============ SECTION HEADS (light) ============ */
.sec-head{max-width:760px;margin:0 0 64px;}
.sec-title{font-family:var(--serif);font-weight:400;color:var(--ink-serif);font-size:clamp(34px,5vw,64px);line-height:1.25;letter-spacing:.05em;margin:16px 0 0;}
.sec-lead{font-size:17px;color:var(--muted);margin:22px 0 0;max-width:560px;}

/* ============ LOGO WALL ============ */
.logo-wall{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;}
.logo-item{background:#fff;border:1px solid var(--line);border-radius:12px;aspect-ratio:5/2;
  display:flex;align-items:center;justify-content:center;padding:14px;overflow:hidden;
  transition:transform .25s,box-shadow .25s,border-color .25s;}
.logo-item:hover{transform:translateY(-3px);box-shadow:0 14px 36px rgba(12,27,51,.1);border-color:#cdd8ee;}
.logo-item img{max-height:100%;max-width:100%;width:auto;object-fit:contain;}
.cases{display:flex;flex-wrap:wrap;gap:14px 40px;margin-top:48px;padding-top:30px;border-top:1px solid var(--line);}
.cases span{font-family:var(--serif);font-size:clamp(22px,3vw,34px);color:var(--ink-serif);letter-spacing:.12em;}
.cases span::before{content:"◆ ";font-size:.4em;color:var(--accent);vertical-align:middle;}

/* ============ ABOUT ============ */
.about-head{max-width:900px;margin:0 0 70px;}
.about-statement{font-family:var(--serif);font-weight:400;color:#fff;font-size:clamp(40px,6.6vw,92px);line-height:1.2;letter-spacing:.05em;margin:16px 0 0;}
.about-statement em{color:var(--serif-blue);}
.philosophy{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;padding-top:50px;border-top:1px solid var(--line-d);}
.philo h4{font-family:var(--serif);font-weight:400;font-size:28px;color:#fff;margin:14px 0 8px;}
.philo p{font-size:15px;color:var(--muted-d);margin:0;}

/* ============ CONTACT ============ */
.contact-grid{display:grid;grid-template-columns:0.95fr 1.05fr;gap:64px;align-items:start;}
.contact-title{font-family:var(--serif);font-weight:400;color:var(--ink-serif);font-size:clamp(40px,6vw,76px);line-height:1;margin:6px 0 0;}
.contact-lead{font-size:16.5px;color:var(--muted);margin:20px 0 36px;max-width:420px;}
.contact-list{list-style:none;margin:0;padding:0;display:grid;gap:18px;}
.contact-list li{display:flex;flex-direction:column;gap:3px;padding-bottom:16px;border-bottom:1px solid var(--line);}
.contact-list li span:first-child{font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);}
.contact-list a{color:var(--accent);font-weight:500;}
.contact-list a:hover{color:var(--ink-serif);}
.contact-form{display:grid;gap:18px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px;box-shadow:0 20px 60px rgba(12,27,51,.06);}
.field{display:flex;flex-direction:column;gap:8px;}
.field span{font-size:13px;font-weight:600;color:var(--ink);}
.field input,.field select,.field textarea{font-family:var(--sans);font-size:15px;color:var(--ink);
  border:0;border-bottom:1.5px solid var(--line);padding:11px 2px;background:transparent;transition:border-color .25s;width:100%;resize:vertical;}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-bottom-color:var(--accent);}
.field select{cursor:pointer;}
.btn-send{justify-self:start;margin-top:8px;font-family:var(--sans);font-size:15px;font-weight:600;color:#fff;
  background:var(--navy-2);border:0;border-radius:999px;padding:14px 30px;cursor:pointer;transition:background .25s,transform .2s;}
.btn-send:hover{background:var(--navy-3);transform:translateY(-2px);}
.form-note{margin:0;color:#1a7d4b;font-size:14px;font-weight:600;}

/* ============ FOOTER ============ */
.site-footer{background:var(--navy-0);color:rgba(210,220,245,.75);padding:56px 0 28px;}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;padding-bottom:30px;border-bottom:1px solid var(--line-d);}
.footer-brand{display:flex;align-items:center;gap:14px;}
.footer-brand img{width:52px;height:52px;object-fit:contain;background:transparent;border-radius:0;padding:0;filter:brightness(0) invert(1);}
.footer-brand strong{display:block;color:#fff;font-weight:600;letter-spacing:.06em;font-size:14px;}
.footer-brand span{font-size:12.5px;color:rgba(170,185,225,.7);}
.footer-nav{display:flex;gap:26px;flex-wrap:wrap;}
.footer-nav a{font-size:14px;color:rgba(210,220,245,.78);}
.footer-nav a:hover{color:#fff;}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:22px;font-size:12.5px;color:rgba(150,165,205,.6);}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease;}
.reveal.in{opacity:1;transform:none;}

/* ============ RESPONSIVE ============ */
@media (max-width:960px){
  .intro-grid{grid-template-columns:1fr;gap:24px;}
  .stats{grid-template-columns:repeat(2,1fr);gap:30px;}
  .svc{grid-template-columns:40px 1fr;gap:14px 24px;}
  .svc-body{grid-column:1 / -1;padding-top:24px;}
  .philosophy{grid-template-columns:1fr;gap:34px;}
  .contact-grid{grid-template-columns:1fr;gap:40px;}
  .logo-wall{grid-template-columns:repeat(4,1fr);}
}
@media (min-width:721px) and (max-width:900px){
  .main-nav{gap:18px;}
  .main-nav a{font-size:13px;}
  .brand-text{font-size:12px;letter-spacing:.1em;}
}
@media (max-width:720px){
  .nav-toggle{display:flex;}
  .main-nav{position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;
    background:rgba(8,18,46,.97);backdrop-filter:blur(14px);padding:8px 0;
    transform:translateY(-10px);opacity:0;pointer-events:none;transition:.22s;}
  .main-nav.open{transform:none;opacity:1;pointer-events:auto;}
  .main-nav a{padding:14px 32px;color:rgba(255,255,255,.85);}
  .site-header.scrolled .main-nav a{color:rgba(255,255,255,.85);}
  .band-light,.band-dark{padding:88px 0;}
  .hero{padding-top:100px;}
  .hero-foot{flex-direction:column;align-items:flex-start;gap:14px;}
}
@media (max-width:480px){
  .container{padding:0 20px;}
  .stats{grid-template-columns:1fr 1fr;}
  .logo-wall{grid-template-columns:repeat(3,1fr);}
}