*{box-sizing:border-box}
html{scroll-behavior:smooth}
:root{
  --bg:#f5f2eb;
  --ink:#101522;
  --muted:#667085;
  --navy:#07111f;
  --blue:#173b70;
  --gold:#d5ad61;
  --line:#e4e8ef;
  --soft:#f8fafc;
  --container:1240px;
  --shadow:0 24px 80px rgba(15,23,42,.10);
}
body{
  margin:0;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  background:linear-gradient(180deg,#f7f3ec 0%,#eef3f8 100%);
  color:var(--ink);
}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%;height:auto}
button{font:inherit}
.topbar{
  width:min(var(--container),calc(100% - 32px));
  margin:18px auto 0;
  padding:14px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  border:1px solid rgba(226,232,240,.92);
  border-radius:28px;
  background:rgba(255,255,255,.9);
  backdrop-filter:blur(18px);
  position:sticky;
  top:16px;
  z-index:50;
  box-shadow:0 18px 52px rgba(15,23,42,.08);
}
.brand{display:flex;align-items:center;gap:12px;min-width:max-content}
.brand-mark{
  width:48px;height:48px;border-radius:16px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;font-size:22px;font-weight:900;
}
.brand strong{display:block;font-size:18px;line-height:1.05}
.brand em{display:block;font-style:normal;font-size:12px;color:#7a8595;letter-spacing:.12em;margin-top:2px}
.nav{display:flex;align-items:center;gap:7px}
.nav a,.nav button{
  border:0;background:transparent;color:var(--ink);
  padding:10px 12px;border-radius:999px;font-weight:850;cursor:pointer;
}
.nav button{background:var(--navy);color:#fff}
.menu-btn{
  display:none;
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
  padding:10px 14px;
  font-weight:900;
}
.eyebrow{
  margin:0 0 12px;
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  font-weight:950;
  color:var(--blue);
}
.nexus-hero{
  width:min(var(--container),calc(100% - 32px));
  margin:34px auto;
  min-height:780px;
  position:relative;
  overflow:hidden;
  display:grid;
  grid-template-columns:.82fr 1.18fr;
  border-radius:48px;
  background:#07111f;
  box-shadow:var(--shadow);
}
.hero-bg{
  position:absolute;inset:0;
  background:url("../images/nexus-hero-bg.webp") center/cover no-repeat;
}
.hero-copy,.hero-panel{position:relative;z-index:2}
.hero-copy{
  padding:72px 58px;
  display:flex;
  flex-direction:column;
  justify-content:center;
}
.hero-copy h1{
  margin:0 0 22px;
  color:#fff;
  font-size:clamp(54px,7vw,104px);
  line-height:.88;
  letter-spacing:-.078em;
}
.nexus-hero .eyebrow{color:#dbeafe}
.lead{
  display:block;
  color:#dbeafe;
  font-size:18px;
  line-height:1.9;
  max-width:850px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.button,.product-btn,.table-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:999px;
  padding:14px 22px;
  border:1px solid transparent;
  font-weight:900;
  cursor:pointer;
}
.button.primary,.product-btn,.table-btn{
  background:linear-gradient(135deg,var(--gold),#efd183);
  color:#07111f;
  box-shadow:0 16px 36px rgba(201,164,106,.18);
}
.button.secondary{background:#fff;color:var(--ink);border-color:var(--line)}
.button.subtle{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.22)}
.button.subtle-dark{background:#fff;color:var(--ink);border-color:var(--line)}
.hero-panel{
  padding:54px;
  display:grid;
  grid-template-rows:auto 1fr auto;
  gap:18px;
}
.panel-head,.panel-links,.panel-stage{
  border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.08);
  backdrop-filter:blur(16px);
}
.panel-head{
  border-radius:30px;
  padding:20px 24px;
  display:flex;
  justify-content:space-between;
  gap:16px;
  color:#fff;
}
.panel-head span{color:#dbeafe}
.panel-stage{
  position:relative;
  min-height:440px;
  border-radius:42px;
  overflow:hidden;
}
.panel-stage img{
  position:absolute;
  object-fit:contain;
  filter:drop-shadow(0 24px 34px rgba(0,0,0,.30));
}
.device-main{height:430px;left:48%;top:50%;transform:translate(-50%,-50%)}
.device-sub.flex{height:175px;right:44px;top:44px}
.device-sub.nano{height:155px;left:44px;bottom:54px}
.device-sub.plus{height:135px;right:80px;bottom:60px}
.panel-links{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  border-radius:28px;
  overflow:hidden;
}
.panel-links a{
  padding:18px;
}
.panel-links b{display:block;color:#fff}
.panel-links span{display:block;color:#dbeafe;margin-top:6px;word-break:break-word}
.service-band,.section,.download-strip,.sub-hero{
  width:min(var(--container),calc(100% - 32px));
  margin:30px auto;
}
.service-band{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
}
.service-band article{
  min-height:188px;
  padding:24px;
  border-radius:30px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:0 14px 44px rgba(15,23,42,.06);
}
.service-band span{display:block;color:var(--blue);font-weight:950;margin-bottom:18px}
.service-band b{display:block;font-size:20px}
.service-band p{margin:8px 0 0;color:var(--muted);line-height:1.68}
.section,.sub-hero{
  padding:38px;
  border-radius:38px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.sub-main{padding-top:10px}
.sub-hero{
  background:linear-gradient(135deg,var(--navy),#1e3a8a);
  color:#fff;
}
.sub-hero h1{
  font-size:clamp(46px,6vw,92px);
  line-height:.9;
  letter-spacing:-.07em;
  margin:0 0 16px;
}
.sub-hero span{color:#dbeafe}
.sub-hero .eyebrow{color:#bfdbfe}
.section-title{margin-bottom:28px}
.section-title.center{text-align:center}
.section-title h2,.official-copy h2,.download-strip h2,.support-copy h2,.faq-rich h2,.modal-card h2{
  font-size:clamp(38px,5vw,68px);
  line-height:.94;
  letter-spacing:-.06em;
  margin:0 0 14px;
}
.section-title span,.official-copy span,.download-strip span,.support-copy span,.sub-hero span{
  display:block;
  color:var(--muted);
  font-size:17px;
  line-height:1.9;
  max-width:860px;
}
.section-title.center span{margin-left:auto;margin-right:auto}
.command-grid{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  grid-template-areas:
    "official support download"
    "official contact download";
  gap:16px;
}
.command-card{
  min-height:250px;
  padding:26px;
  text-align:left;
  border-radius:30px;
  border:1px solid var(--line);
  background:var(--soft);
  display:flex;
  flex-direction:column;
  justify-content:space-between;
}
.command-card small,.product-feature span{
  color:var(--blue);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  font-weight:950;
}
.command-card h3,.product-feature h3,.official-points h3,.pathway h3,.security-grid h3,.support-layout h3{
  margin:16px 0 10px;
  font-size:29px;
  line-height:1.05;
  letter-spacing:-.045em;
}
.command-card p,.product-feature p,.official-points p,.pathway p,.security-grid p,.support-layout p,.faq-rich p,.site-footer p{
  color:var(--muted);
  line-height:1.78;
}
.command-card strong{word-break:break-word}
.command-card.official{
  grid-area:official;
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;
}
.command-card.official small{color:#bfdbfe}
.command-card.official p,.command-card.official strong{color:#dbeafe}
.command-card.support{grid-area:support}
.command-card.download{grid-area:download;background:#fff}
.command-card.contact{grid-area:contact;cursor:pointer}
.official-section{
  display:grid;
  grid-template-columns:.92fr 1.08fr;
  gap:20px;
}
.official-copy{
  padding:34px;
  border-radius:32px;
  background:linear-gradient(135deg,var(--navy),#1e3a8a);
  color:#fff;
}
.official-copy span{color:#dbeafe}
.official-points{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:16px;
}
.official-points article,.pathway article,.security-grid article{
  padding:24px;
  border-radius:28px;
  background:var(--soft);
  border:1px solid var(--line);
}
.official-points i{
  display:grid;
  place-items:center;
  width:46px;height:46px;
  border-radius:16px;
  background:var(--navy);
  color:#fff;
  font-style:normal;
  margin-bottom:12px;
}
.product-layout{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:16px;
}
.product-feature{
  min-height:345px;
  display:grid;
  grid-template-columns:230px 1fr;
  gap:18px;
  align-items:center;
  padding:24px;
  border-radius:32px;
  background:var(--soft);
  border:1px solid var(--line);
}
.product-feature.stax{
  grid-row:span 3;
  grid-template-columns:1fr;
  background:linear-gradient(180deg,#fff,#eef5ff);
}
.product-feature figure{
  min-height:210px;
  margin:0;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:26px;
  background:#fff;
  border:1px solid var(--line);
}
.product-feature.stax figure{min-height:450px}
.product-feature img{
  max-height:180px;
  object-fit:contain;
  filter:drop-shadow(0 20px 26px rgba(15,23,42,.16));
}
.product-feature.stax img{max-height:380px}
.product-btn{margin-top:16px}
.table-wrap{
  overflow:auto;
  border-radius:26px;
  border:1px solid var(--line);
  background:#fff;
}
table{width:100%;border-collapse:collapse}
th,td{
  text-align:left;
  padding:18px;
  border-bottom:1px solid var(--line);
}
th{background:#eef5ff}
.download-strip{
  display:grid;
  grid-template-columns:1fr auto;
  align-items:center;
  gap:24px;
  padding:42px;
  border-radius:38px;
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;
  box-shadow:var(--shadow);
}
.download-strip span{color:#dbeafe}
.download-strip .eyebrow{color:#bfdbfe}
.pathway,.security-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
}
.pathway b,.security-grid span{
  display:grid;
  place-items:center;
  width:48px;
  height:48px;
  border-radius:16px;
  background:var(--navy);
  color:#fff;
  margin-bottom:16px;
  font-weight:900;
}
.security-grid{
  grid-template-columns:repeat(4,1fr);
}
.security-grid article{background:#fff}
.security-grid article:nth-child(1),
.security-grid article:nth-child(2),
.security-grid article:nth-child(3),
.security-grid article:nth-child(4){background:#f8fbff}
.faq-columns{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:14px;
}
.faq-columns details{
  padding:22px;
  border-radius:24px;
  background:var(--soft);
  border:1px solid var(--line);
}
.faq-columns summary{
  font-size:20px;
  font-weight:900;
  cursor:pointer;
}
.support-layout{
  display:grid;
  grid-template-columns:1.05fr .75fr;
  gap:20px;
}
.support-copy,.qr-card{
  padding:30px;
  border-radius:32px;
  background:var(--soft);
  border:1px solid var(--line);
}
.tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:20px;
}
.tags em{
  font-style:normal;
  padding:9px 12px;
  border-radius:999px;
  background:#fff;
  border:1px solid var(--line);
  font-size:13px;
}
.qr-card{text-align:center}
.qr-card img{
  width:min(300px,100%);
  margin:0 auto 18px;
  padding:12px;
  border-radius:26px;
  background:#fff;
  border:1px solid var(--line);
}
.site-footer{
  margin-top:48px;
  padding:42px 6vw;
  background:var(--navy);
  color:#fff;
  display:flex;
  justify-content:space-between;
  gap:24px;
}
.site-footer span{
  display:block;
  color:#bfdbfe;
  text-transform:uppercase;
  letter-spacing:.16em;
  font-size:12px;
  font-weight:950;
}
.site-footer strong{display:block;font-size:34px;margin:8px 0}
.site-footer p{color:#dbeafe;max-width:760px}
.footer-links{
  display:flex;
  flex-direction:column;
  gap:10px;
  align-items:flex-end;
}
.footer-links button{
  border:1px solid rgba(255,255,255,.22);
  background:transparent;
  color:#fff;
  border-radius:999px;
  padding:12px 18px;
  font-weight:900;
  cursor:pointer;
}
.contact-modal{
  display:none;
  position:fixed;
  inset:0;
  z-index:100;
  align-items:center;
  justify-content:center;
}
.contact-modal.open{display:flex}
.modal-mask{
  position:absolute;
  inset:0;
  background:rgba(7,17,31,.70);
  backdrop-filter:blur(12px);
}
.modal-card{
  position:relative;
  z-index:2;
  width:min(460px,calc(100% - 24px));
  background:#fff;
  color:var(--ink);
  border-radius:34px;
  padding:30px;
  text-align:center;
  box-shadow:0 30px 90px rgba(15,23,42,.28);
}
.modal-close{
  position:absolute;
  right:14px;
  top:10px;
  border:0;
  background:transparent;
  font-size:30px;
  cursor:pointer;
}
.modal-qr{
  width:min(300px,100%);
  margin:18px auto;
  padding:12px;
  border-radius:26px;
  background:#f8fbff;
  border:1px solid var(--line);
}
.modal-card p{color:var(--muted)}
.modal-actions{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:12px;
  margin-top:18px;
}
.float-contact{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:80;
  border:0;
  border-radius:999px;
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;
  padding:14px 18px;
  font-weight:900;
  cursor:pointer;
  box-shadow:0 20px 44px rgba(15,23,42,.24);
}
body.lock{overflow:hidden}
@media(max-width:1120px){
  .nav{display:none}
  .nav.show{
    display:flex;
    position:absolute;
    top:76px;
    left:0;
    right:0;
    flex-direction:column;
    align-items:flex-start;
    background:#fff;
    border:1px solid var(--line);
    border-radius:24px;
    padding:16px;
    box-shadow:var(--shadow);
  }
  .menu-btn{display:block}
  .nexus-hero{grid-template-columns:1fr}
  .hero-panel{min-height:580px}
  .service-band,.official-points,.pathway,.security-grid,.faq-columns{grid-template-columns:repeat(2,1fr)}
  .official-section,.support-layout{grid-template-columns:1fr}
  .command-grid{
    grid-template-columns:1fr 1fr;
    grid-template-areas:"official official" "support download" "contact download";
  }
  .product-layout{grid-template-columns:1fr}
  .product-feature.stax{grid-row:auto}
  .download-strip,.site-footer{grid-template-columns:1fr;display:grid}
  .footer-links{align-items:flex-start}
}
@media(max-width:720px){
  .hero-copy{padding:34px 24px}
  .hero-copy h1{font-size:42px}
  .hero-panel{display:none}
  .service-band,.official-points,.pathway,.security-grid,.faq-columns,.command-grid{grid-template-columns:1fr}
  .command-grid{grid-template-areas:"official" "support" "download" "contact"}
  .section,.sub-hero,.download-strip{padding:24px}
  .product-feature,.product-feature:not(.stax){grid-template-columns:1fr}
  .hero-actions,.modal-actions{flex-direction:column}
  .button,.product-btn,.table-btn{width:100%}
}