:root{
  --ink:#05070A;
  --cyan:#00E5FF;
  --magenta:#FF2E8A;
  --lime:#A6FF00;
  --panel:#1A2028;
  --line:#5A6572;
  --white:#F2F7FA;
  --deep:#003A44;
  --scan:#7DF9FF;
  --header-h:72px;
  --container:1200px;
  --gut:clamp(16px,4vw,40px);
  --font-head:"Helvetica Neue","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-data:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,"Courier New",monospace;
  --font-serif:Georgia,"Songti SC","SimSun",serif;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:9;
  background:
    repeating-linear-gradient(to bottom,rgba(125,249,255,.035) 0 1px,transparent 1px 3px);
  mix-blend-mode:screen;
  opacity:.7;
}
img,svg{max-width:100%;display:block;}
a{color:var(--cyan);text-decoration:none;}
a:hover{color:var(--scan);}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:900;
  font-stretch:condensed;
  letter-spacing:-.02em;
  line-height:1.08;
  margin:0 0 .5em;
  text-transform:none;
}
p{margin:0 0 1em;}
ul{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;}
:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  background:var(--cyan);
  color:var(--ink);
  padding:12px 20px;
  font-family:var(--font-data);
  font-size:13px;
  letter-spacing:.08em;
}
.skip-link:focus{
  left:12px;
  top:12px;
}

/* ---------- scroll progress ---------- */
.scroll-progress{
  position:fixed;
  top:0;left:0;
  height:2px;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--lime));
  z-index:120;
  transition:width .12s linear;
}

/* ---------- containers ---------- */
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gut);
}
.container-narrow{
  width:100%;
  max-width:760px;
  margin:0 auto;
  padding:0 var(--gut);
}

/* ---------- header ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  background:transparent;
  border-bottom:1px solid rgba(0,229,255,.22);
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.site-header[data-scrolled]{
  background:rgba(5,7,10,.97);
  border-bottom-color:var(--cyan);
  box-shadow:0 1px 0 rgba(0,229,255,.35),0 14px 40px rgba(0,0,0,.7);
}
.header-frame{
  position:absolute;
  inset:6px 8px auto 8px;
  height:calc(100% - 12px);
  border-left:1px solid rgba(90,101,114,.5);
  border-right:1px solid rgba(90,101,114,.5);
  pointer-events:none;
}
.header-inner{
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:clamp(12px,2.4vw,28px);
  position:relative;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  color:var(--white);
  flex:0 0 auto;
}
.brand:hover{color:var(--white);}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:38px;height:38px;
  border:2px solid var(--cyan);
  background:var(--deep);
  color:var(--cyan);
  font-family:var(--font-data);
  font-size:14px;
  letter-spacing:.06em;
  box-shadow:4px 4px 0 rgba(0,229,255,.24);
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-line{
  font-family:var(--font-head);
  font-weight:900;
  font-size:15px;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-data);
  font-size:10.5px;
  color:var(--line);
  letter-spacing:.1em;
  white-space:nowrap;
}
.header-meta{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}
.version-badge{
  font-family:var(--font-data);
  font-size:12px;
  color:var(--ink);
  background:var(--lime);
  padding:3px 8px;
  letter-spacing:.06em;
}
.header-quick{
  font-family:var(--font-data);
  font-size:12px;
  color:var(--scan);
  border:1px solid rgba(0,229,255,.4);
  padding:4px 10px;
  letter-spacing:.04em;
  white-space:nowrap;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  background:transparent;
  border:1px solid var(--cyan);
  padding:8px 10px;
  cursor:pointer;
}
.nav-toggle-bar{
  display:block;
  width:16px;height:2px;
  background:var(--cyan);
}
.nav-toggle-text{
  font-family:var(--font-data);
  font-size:12px;
  color:var(--cyan);
  letter-spacing:.08em;
}
.site-nav{
  display:flex;
  align-items:center;
  gap:18px;
  margin-left:auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(6px,1.2vw,18px);
}
.nav-link{
  display:inline-block;
  position:relative;
  color:var(--white);
  font-size:14px;
  padding:6px 2px;
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;bottom:-2px;
  height:2px;width:0;
  background:var(--cyan);
  transition:width .25s var(--ease);
}
.nav-link:hover{color:var(--cyan);}
.nav-link:hover::after{width:100%;}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}
.nav-link[aria-current="page"]::after{width:100%;}
.nav-tail{margin-left:8px;}
.frame-ticks{
  height:6px;
  background:
    repeating-linear-gradient(to right,
      var(--line) 0 1px,
      transparent 1px 24px);
  opacity:.6;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-family:var(--font-data);
  font-size:13px;
  letter-spacing:.06em;
  padding:11px 18px;
  border:2px solid var(--cyan);
  background:transparent;
  color:var(--cyan);
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease);
}
.btn-primary{
  background:var(--cyan);
  color:var(--ink);
  box-shadow:5px 5px 0 rgba(0,229,255,.28);
}
.btn-primary:hover{
  background:var(--lime);
  border-color:var(--lime);
  color:var(--ink);
  box-shadow:5px 5px 0 rgba(166,255,0,.3);
  transform:translate(-1px,-1px);
}
.btn-ghost{
  border-color:var(--line);
  color:var(--white);
}
.btn-ghost:hover{
  border-color:var(--magenta);
  color:var(--magenta);
}
.btn-sm{
  font-size:12px;
  padding:8px 12px;
  border-width:1px;
}

/* ---------- link underline ---------- */
.link-underline{
  position:relative;
  color:var(--white);
  padding-bottom:2px;
  display:inline-block;
}
.link-underline::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  height:1px;width:100%;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s var(--ease);
}
.link-underline:hover{color:var(--cyan);}
.link-underline:hover::after{transform:scaleX(1);}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  padding:calc(var(--header-h) + 18px) 0 0;
}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-data);
  font-size:12px;
  color:var(--line);
  letter-spacing:.05em;
}
.breadcrumb-item::before{
  content:"/";
  margin-right:8px;
  color:var(--line);
}
.breadcrumb-item:first-child::before{content:"";margin:0;}
.breadcrumb-item a{color:var(--line);}
.breadcrumb-item a:hover{color:var(--cyan);}
.breadcrumb-item[aria-current="page"]{color:var(--cyan);}

/* ---------- section head ---------- */
.section-head{
  display:flex;
  flex-direction:column;
  gap:6px;
  margin-bottom:24px;
}
.section-index{
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--lime);
  text-transform:uppercase;
}
.section-title{
  font-size:clamp(26px,4vw,46px);
  margin:0;
}
.section-kicker{
  font-family:var(--font-serif);
  font-style:italic;
  color:var(--line);
  font-size:15px;
}

/* ---------- grid ---------- */
.grid{display:grid;gap:clamp(14px,2vw,26px);}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid-asym{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);}

/* ---------- cards ---------- */
.card{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  border-left:3px solid var(--cyan);
  padding:22px 20px;
  transition:border-color .22s var(--ease),transform .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{
  border-color:var(--cyan);
  border-left-color:var(--lime);
  box-shadow:7px 7px 0 rgba(0,229,255,.18);
  transform:translate(-2px,-2px);
}
.card-tag{
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--cyan);
}
.card-title{
  font-size:20px;
  margin:10px 0 8px;
}
.card-meta{
  font-family:var(--font-data);
  font-size:12px;
  color:var(--line);
  letter-spacing:.04em;
}
.data-num{
  font-family:var(--font-data);
  color:var(--lime);
  letter-spacing:.04em;
}

/* ---------- tags ---------- */
.tag{
  display:inline-block;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.1em;
  padding:4px 9px;
  border:1px solid var(--line);
  color:var(--white);
  background:transparent;
  cursor:default;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.tag:hover{background:var(--white);color:var(--ink);border-color:var(--white);}
.tag-cyan{border-color:var(--cyan);color:var(--cyan);}
.tag-cyan:hover{background:var(--cyan);color:var(--ink);border-color:var(--cyan);}
.tag-magenta{border-color:var(--magenta);color:var(--magenta);}
.tag-magenta:hover{background:var(--magenta);color:var(--ink);border-color:var(--magenta);}
.tag-lime{border-color:var(--lime);color:var(--lime);}
.tag-lime:hover{background:var(--lime);color:var(--ink);border-color:var(--lime);}

/* ---------- panel ---------- */
.panel{
  background:var(--panel);
  border:1px solid var(--line);
}
.panel-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-head);
  font-weight:900;
  font-size:16px;
}
.panel-head[data-collapse-trigger]{
  cursor:pointer;
  width:100%;
  text-align:left;
  background:transparent;
  border-left:0;border-right:0;border-top:0;
}
.panel-head[data-collapse-trigger]:hover{color:var(--cyan);}
.panel-body{padding:16px 18px;}

/* ---------- media frame (image placeholder container) ---------- */
.media-frame{
  position:relative;
  width:100%;
  aspect-ratio:16/9;
  background:var(--deep);
  border:1px solid var(--cyan);
  overflow:hidden;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(to bottom,rgba(125,249,255,.07) 0 1px,transparent 1px 4px);
  pointer-events:none;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.85) contrast(1.05);
}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:4/5;}
.media-caption{
  font-family:var(--font-data);
  font-size:11.5px;
  color:var(--line);
  letter-spacing:.05em;
  margin-top:8px;
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:80px;
  background:var(--ink);
  border-top:1px solid var(--cyan);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;right:0;
  width:46%;
  height:100%;
  background:linear-gradient(160deg,rgba(0,58,68,.9),transparent 70%);
  clip-path:polygon(18% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.footer-inner{
  position:relative;
  z-index:1;
  padding:52px var(--gut) 26px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1.2fr);
  gap:clamp(20px,3vw,44px);
  padding-bottom:30px;
  border-bottom:1px solid rgba(90,101,114,.55);
}
.footer-brand{display:flex;flex-direction:column;gap:10px;align-items:flex-start;}
.footer-brand-line{
  font-family:var(--font-head);
  font-weight:900;
  font-size:18px;
  margin:0;
}
.footer-note{
  font-family:var(--font-data);
  font-size:12px;
  color:var(--line);
  line-height:1.6;
  margin:0;
}
.footer-nav-list{display:flex;flex-direction:column;gap:10px;}
.footer-nav-list a{font-size:14px;color:var(--white);}
.footer-contact{display:flex;flex-direction:column;gap:8px;}
.footer-contact p{margin:0;font-size:14px;}
.footer-contact-label{
  font-family:var(--font-data);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--lime);
  text-transform:uppercase;
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 22px;
  padding:20px 0;
  font-family:var(--font-data);
  font-size:12px;
  color:var(--line);
  border-bottom:1px solid rgba(90,101,114,.35);
}
.footer-version{color:var(--cyan);letter-spacing:.06em;}
.footer-switch{color:var(--white);letter-spacing:.04em;}
.footer-legal-list{display:flex;flex-wrap:wrap;gap:18px;margin-left:auto;}
.footer-legal-list a{font-size:12px;color:var(--white);}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px;
  padding-top:18px;
  font-family:var(--font-data);
  font-size:12px;
  color:var(--line);
  letter-spacing:.05em;
}
.footer-bottom p{margin:0;}
.footer-slash{
  position:relative;
  height:14px;
  background:repeating-linear-gradient(to right,var(--cyan) 0 14px,transparent 14px 34px);
  opacity:.35;
}

/* ---------- to top ---------- */
.to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:110;
  width:44px;height:44px;
  display:none;
  align-items:center;
  justify-content:center;
  background:var(--panel);
  border:1px solid var(--cyan);
  color:var(--cyan);
  font-family:var(--font-data);
  cursor:pointer;
}
.to-top[data-visible]{display:inline-flex;}
.to-top:hover{background:var(--cyan);color:var(--ink);}

/* ---------- responsiveness ---------- */
@media (max-width:1080px){
  .header-quick{display:none;}
}
@media (max-width:900px){
  :root{--header-h:64px;}
  .nav-toggle{display:inline-flex;margin-left:auto;}
  .site-nav{
    position:absolute;
    top:100%;
    left:0;right:0;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    background:rgba(5,7,10,.99);
    border-top:1px solid var(--cyan);
    border-bottom:1px solid var(--cyan);
    padding:0 var(--gut) 18px;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height .3s var(--ease),visibility .3s var(--ease);
  }
  .site-nav[data-open]{
    max-height:80vh;
    visibility:visible;
    overflow-y:auto;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding-top:8px;}
  .nav-link{
    display:block;
    padding:13px 0;
    border-bottom:1px solid rgba(90,101,114,.4);
    font-size:15px;
  }
  .nav-link[aria-current="page"]{color:var(--cyan);}
  .nav-tail{padding-top:14px;}
  .header-meta{margin-left:0;}
  .footer-top{grid-template-columns:1fr;}
  .footer-legal-list{margin-left:0;}
  .grid-2,.grid-3,.grid-asym{grid-template-columns:minmax(0,1fr);}
}
@media (max-width:600px){
  body{font-size:15px;}
  .brand-sub{display:none;}
  .version-badge{font-size:11px;}
  .header-quick{display:none;}
  .header-frame{display:none;}
  .card{padding:18px 16px;}
  .footer-inner{padding:40px var(--gut) 22px;}
  .footer-bottom{flex-direction:column;}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .scroll-progress{transition:none;}
}