*{box-sizing:border-box}
html{scroll-behavior:smooth}
:root{
  --bg:#f7f7f2;
  --ink:#111111;
  --muted:#656565;
  --line:#1a1a1a;
  --soft:#ecece5;
  --dark:#111111;
  --white:#ffffff;
  --accent:#8d6f3d;
  --blue:#173b70;
  --container:1240px;
}
body{
  margin:0;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  background:var(--bg);
  color:var(--ink);
  background-image:
    linear-gradient(rgba(0,0,0,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,0,0,.045) 1px,transparent 1px);
  background-size:36px 36px;
}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%;height:auto}
button{font:inherit}
.site-frame{
  width:min(var(--container),calc(100% - 28px));
  margin:14px auto 0;
  padding:0;
  min-height:74px;
  display:grid;
  grid-template-columns:auto 1fr;
  align-items:stretch;
  background:var(--bg);
  border:2px solid var(--line);
  position:sticky;
  top:14px;
  z-index:50;
}
.frame-brand{
  display:flex;
  align-items:center;
  gap:14px;
  border-right:2px solid var(--line);
  padding:12px 18px;
  min-width:max-content;
}
.frame-logo{
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  background:var(--dark);
  color:#fff;
  font-size:22px;
  font-weight:900;
}
.frame-brand strong{display:block;font-size:18px}
.frame-brand em{display:block;font-style:normal;font-size:12px;color:var(--muted);letter-spacing:.14em}
.frame-nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
}
.frame-nav a,.frame-nav button{
  align-self:stretch;
  display:flex;
  align-items:center;
  border:0;
  border-left:2px solid var(--line);
  background:transparent;
  color:var(--ink);
  padding:0 14px;
  font-weight:900;
  cursor:pointer;
}
.frame-nav button{background:var(--dark);color:#fff}
.menu-btn{
  display:none;
  border:0;
  border-left:2px solid var(--line);
  background:transparent;
  padding:0 18px;
  font-weight:900;
}
.meta{
  margin:0 0 12px;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.16em;
  color:var(--accent);
  font-weight:1000;
}
.map-hero{
  width:min(var(--container),calc(100% - 28px));
  margin:24px auto;
  min-height:650px;
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  border:2px solid var(--line);
  background:url("../images/meridian-grid-bg.webp") center/cover no-repeat;
}
.map-copy{
  padding:54px;
  display:flex;
  flex-direction:column;
  justify-content:center;
  border-right:2px solid var(--line);
  background:rgba(247,247,242,.88);
}
.map-copy h1{
  margin:0 0 22px;
  font-size:clamp(54px,7vw,104px);
  line-height:.88;
  letter-spacing:-.078em;
  max-width:720px;
}
.lead,.section-side span,.section-head span,.authority-main span,.download-terminal span,.support-copy span,.sub-hero span{
  display:block;
  color:var(--muted);
  font-size:17px;
  line-height:1.9;
  max-width:860px;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  margin-top:30px;
}
.button,.line-btn,.table-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
  padding:0 22px;
  border:2px solid var(--line);
  font-weight:1000;
  cursor:pointer;
}
.button.primary,.line-btn,.table-btn{
  background:var(--dark);
  color:#fff;
}
.button.secondary{
  background:var(--white);
  color:var(--ink);
}
.button.plain{
  background:transparent;
  color:var(--ink);
}
.map-stage{
  position:relative;
  min-height:650px;
  overflow:hidden;
}
.stage-panel{
  position:absolute;
  inset:80px 70px 110px 70px;
  border:2px solid rgba(255,255,255,.58);
  display:flex;
  align-items:center;
  justify-content:center;
}
.stage-panel img{
  position:absolute;
  object-fit:contain;
  filter:drop-shadow(0 24px 28px rgba(0,0,0,.30));
}
.stage-stax{height:360px;left:42%;top:46%;transform:translate(-50%,-50%)}
.stage-flex{height:190px;right:40px;top:56px}
.stage-nano{height:160px;left:36px;bottom:46px}
.stage-caption{
  position:absolute;
  right:70px;
  bottom:42px;
  width:380px;
  background:#fff;
  border:2px solid var(--line);
  padding:18px;
}
.stage-caption b{display:block}
.stage-caption span{display:block;color:var(--muted);margin-top:5px}
.route-bar,.section,.download-terminal,.sub-hero{
  width:min(var(--container),calc(100% - 28px));
  margin:24px auto;
}
.route-bar{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border:2px solid var(--line);
  background:#fff;
}
.route-bar article{
  padding:22px;
  border-right:2px solid var(--line);
}
.route-bar article:last-child{border-right:0}
.route-bar b{
  display:block;
  font-size:14px;
  margin-bottom:24px;
}
.route-bar strong{
  display:block;
  font-size:24px;
  letter-spacing:-.04em;
}
.route-bar span{
  display:block;
  color:var(--muted);
  margin-top:8px;
  word-break:break-word;
}
.section,.sub-hero{
  background:#fff;
  border:2px solid var(--line);
  padding:34px;
}
.sub-main{padding-top:10px}
.sub-hero{
  background:#111;
  color:#fff;
}
.sub-hero h1{
  margin:0 0 16px;
  font-size:clamp(48px,7vw,92px);
  line-height:.9;
  letter-spacing:-.07em;
}
.sub-hero span{color:#cfcfcf}
.split-intro{
  display:grid;
  grid-template-columns:360px 1fr;
  gap:34px;
}
.section-side{
  border-right:2px solid var(--line);
  padding-right:28px;
}
.section-side h2,.section-head h2,.authority-main h2,.download-terminal h2,.support-copy h2,.faq-section h2,.modal-card h2{
  margin:0 0 16px;
  font-size:clamp(38px,5vw,66px);
  line-height:.95;
  letter-spacing:-.06em;
}
.access-stack{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
}
.access-stack.full{grid-template-columns:repeat(2,1fr);width:100%}
.access-card{
  text-align:left;
  min-height:285px;
  border:2px solid var(--line);
  background:var(--bg);
  padding:24px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
}
.access-card em{
  font-style:normal;
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:.14em;
  font-size:12px;
  font-weight:1000;
}
.access-card h3,.device-info h3,.authority-grid h3,.process-grid h3,.support-grid h3{
  margin:16px 0 10px;
  font-size:29px;
  line-height:1.05;
  letter-spacing:-.045em;
}
.access-card p,.device-info p,.authority-grid p,.process-grid p,.support-grid p,.faq-section p,.site-footer p{
  color:var(--muted);
  line-height:1.78;
}
.access-card strong{word-break:break-word}
.access-card.official{
  background:#111;
  color:#fff;
}
.access-card.official p,.access-card.official strong{color:#d7d7d7}
.access-card.download{background:#efe2ca}
.access-card button,.access-card{cursor:pointer}
.authority{
  display:grid;
  grid-template-columns:.95fr 1.05fr;
  gap:0;
  padding:0;
}
.authority-main{
  background:#111;
  color:#fff;
  padding:34px;
  border-right:2px solid var(--line);
}
.authority-main span{color:#d7d7d7}
.authority-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
}
.authority-grid article{
  padding:28px;
  border-right:2px solid var(--line);
  border-bottom:2px solid var(--line);
}
.authority-grid article:nth-child(2n){border-right:0}
.authority-grid article:nth-child(n+3){border-bottom:0}
.section-head{margin-bottom:28px}
.section-head.center{text-align:center}
.device-list{
  display:grid;
  gap:0;
  border:2px solid var(--line);
}
.device-row{
  display:grid;
  grid-template-columns:80px 230px 1fr 170px;
  align-items:center;
  border-bottom:2px solid var(--line);
  background:var(--bg);
}
.device-row:last-child{border-bottom:0}
.device-no{
  height:100%;
  display:grid;
  place-items:center;
  border-right:2px solid var(--line);
  font-size:22px;
  font-weight:1000;
}
.device-photo{
  height:230px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-right:2px solid var(--line);
  background:#fff;
}
.device-photo img{
  max-height:170px;
  object-fit:contain;
  filter:drop-shadow(0 18px 20px rgba(0,0,0,.14));
}
.device-info{
  padding:24px;
}
.device-info span{
  color:var(--accent);
  font-size:12px;
  font-weight:1000;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.device-row .line-btn{
  margin:0 22px;
}
.table-wrap{
  border:2px solid var(--line);
  overflow:auto;
}
table{
  width:100%;
  border-collapse:collapse;
  background:#fff;
}
th,td{
  text-align:left;
  padding:18px;
  border-bottom:2px solid var(--line);
  border-right:2px solid var(--line);
}
th:last-child,td:last-child{border-right:0}
tr:last-child td{border-bottom:0}
th{background:#efe2ca}
.download-terminal{
  display:grid;
  grid-template-columns:1fr auto;
  gap:24px;
  align-items:center;
  padding:34px;
  background:#111;
  color:#fff;
  border:2px solid var(--line);
}
.download-terminal span{color:#d7d7d7}
.process-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:0;
  padding:0;
}
.process-grid article{
  padding:28px;
  border-right:2px solid var(--line);
  border-bottom:2px solid var(--line);
  background:#fff;
}
.process-grid article:nth-child(3n){border-right:0}
.process-grid article:nth-child(n+4){border-bottom:0}
.process-grid b{
  display:grid;
  place-items:center;
  width:50px;
  height:50px;
  background:#111;
  color:#fff;
  margin-bottom:18px;
}
.support-grid{
  display:grid;
  grid-template-columns:1.05fr .75fr;
  gap:34px;
}
.support-copy,.qr-card{
  border:2px solid var(--line);
  padding:28px;
  background:var(--bg);
}
.tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:20px;
}
.tags em{
  font-style:normal;
  padding:9px 12px;
  border:2px solid var(--line);
  font-size:13px;
  background:#fff;
}
.qr-card{text-align:center}
.qr-card img{
  width:min(300px,100%);
  margin:0 auto 18px;
  padding:12px;
  background:#fff;
  border:2px solid var(--line);
}
.faq-section details{
  border-top:2px solid var(--line);
  padding:20px 0;
}
.faq-section summary{
  font-size:20px;
  font-weight:1000;
  cursor:pointer;
}
.site-footer{
  margin-top:48px;
  background:#111;
  color:#fff;
  padding:42px 6vw;
  display:flex;
  justify-content:space-between;
  gap:24px;
}
.site-footer span{
  display:block;
  color:#d7d7d7;
  text-transform:uppercase;
  font-size:12px;
  letter-spacing:.16em;
  font-weight:1000;
}
.site-footer strong{
  display:block;
  font-size:34px;
  margin:8px 0;
}
.site-footer p{color:#cfcfcf;max-width:760px}
.footer-links{
  display:flex;
  flex-direction:column;
  gap:10px;
  align-items:flex-end;
}
.footer-links button{
  border:2px solid #fff;
  color:#fff;
  background:transparent;
  padding:12px 18px;
  font-weight:1000;
  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(0,0,0,.66);
  backdrop-filter:blur(10px);
}
.modal-card{
  position:relative;
  z-index:2;
  width:min(460px,calc(100% - 24px));
  background:#fff;
  color:#111;
  border:2px solid var(--line);
  padding:30px;
  text-align:center;
  box-shadow:0 30px 90px rgba(0,0,0,.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:2px solid var(--line);
  background:#fff;
}
.modal-card p{color:var(--muted)}
.modal-actions{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:0;
  margin-top:18px;
}
.float-contact{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:80;
  border:2px solid var(--line);
  background:#111;
  color:#fff;
  padding:14px 18px;
  font-weight:1000;
  cursor:pointer;
}

@media(max-width:1120px){
  .site-frame{grid-template-columns:auto auto}
  .frame-nav{display:none}
  .frame-nav.show{
    display:flex;
    position:absolute;
    left:-2px;
    right:-2px;
    top:72px;
    flex-direction:column;
    align-items:stretch;
    background:var(--bg);
    border:2px solid var(--line);
  }
  .frame-nav.show a,.frame-nav.show button{
    border-left:0;
    border-top:2px solid var(--line);
    padding:16px;
  }
  .menu-btn{display:block}
  .map-hero,.split-intro,.authority,.support-grid{grid-template-columns:1fr}
  .map-copy,.authority-main,.section-side{border-right:0;border-bottom:2px solid var(--line)}
  .route-bar,.access-stack,.process-grid{grid-template-columns:repeat(2,1fr)}
  .device-row{grid-template-columns:70px 190px 1fr}
  .device-row .line-btn{grid-column:1 / -1;margin:0;border-left:0;border-right:0;border-bottom:0}
  .download-terminal,.site-footer{grid-template-columns:1fr;display:grid}
  .footer-links{align-items:flex-start}
}
@media(max-width:720px){
  .map-hero{grid-template-columns:1fr;min-height:auto}
  .map-copy{padding:34px 24px}
  .map-copy h1{font-size:42px}
  .map-stage{display:none}
  .section,.download-terminal,.sub-hero{padding:24px}
  .route-bar,.access-stack,.access-stack.full,.authority-grid,.process-grid{grid-template-columns:1fr}
  .route-bar article,.authority-grid article,.process-grid article{border-right:0}
  .authority-grid article{border-bottom:2px solid var(--line)!important}
  .authority-grid article:last-child{border-bottom:0!important}
  .process-grid article{border-bottom:2px solid var(--line)!important}
  .process-grid article:last-child{border-bottom:0!important}
  .device-row{grid-template-columns:1fr}
  .device-no,.device-photo{border-right:0;border-bottom:2px solid var(--line)}
  .hero-actions,.modal-actions{flex-direction:column}
  .button,.line-btn,.table-btn{width:100%}
}