*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg,video{max-width:100%}
button{font:inherit}

:root{
  --ink:#070A0F;
  --navy:#0E141B;
  --paper:#F3EFE3;
  --green:#B8FF2C;
  --blue:#37A7FF;
  --orange:#FF8A2A;
  --pitch:#12351F;
  --grey:#9AA7B4;
  --white:#F8FAF5;
  --line:#55606B;
  --line-soft:rgba(85,96,107,.42);
  --rail-w:128px;
  --bar-h:58px;
  --maxw:1180px;
  --measure:36em;
  --ff-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --ff-mono:ui-monospace,"SFMono-Regular","IBM Plex Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.7,.3,1);
}

html{background:var(--ink)}
body{
  background:var(--ink);
  color:var(--white);
  font-family:var(--ff-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
main{display:block}
[id]{scroll-margin-top:84px}
@media (min-width:960px){[id]{scroll-margin-top:32px}}
#main-content:focus{outline:none}

h1,h2,h3,h4{margin:0 0 .5em;color:var(--white);font-weight:800;line-height:1.08;letter-spacing:-.015em}
h1{font-size:clamp(38px,6.4vw,84px)}
h2{font-size:clamp(24px,3.2vw,40px)}
h3{font-size:clamp(18px,1.9vw,22px);letter-spacing:0;line-height:1.3}
h4{font-size:15px;letter-spacing:.04em;line-height:1.35}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:#7cc6ff}
ul,ol{margin:0 0 1em;padding-left:1.2em}
blockquote{margin:0;padding:4px 0 4px 18px;border-left:2px solid var(--green);color:var(--paper)}
code,kbd,samp{font-family:var(--ff-mono);font-size:.92em}
::selection{background:var(--green);color:#070A0F}

:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:1px}
a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--green);outline-offset:3px}

@media (max-width:959px){
  .nav-open,.nav-open body{overflow:hidden}
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:10px;top:10px;z-index:300;
  display:inline-block;padding:10px 16px;
  background:var(--green);color:#070A0F;
  font-size:13px;font-weight:700;letter-spacing:.04em;text-decoration:none;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);color:#070A0F}

/* ---------- header shell ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,#0B1017 0%,#070A0F 100%);
  border-bottom:1px solid var(--line-soft);
}
.rail{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  min-height:var(--bar-h);padding:9px 14px;
}

.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--white)}
.brand:hover{color:var(--white)}
.brand__mark{
  position:relative;display:grid;place-items:center;
  width:34px;height:34px;flex:0 0 auto;
  background:var(--green);color:#070A0F;
  font-family:var(--ff-mono);font-size:18px;font-weight:700;line-height:1;
  box-shadow:0 0 0 1px rgba(184,255,44,.35),0 10px 20px -14px rgba(184,255,44,.95);
}
.brand__dot{position:absolute;top:3px;right:3px;width:5px;height:5px;border-radius:50%;background:#070A0F}
.brand__word{font-size:13px;font-weight:600;letter-spacing:.12em;white-space:nowrap}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 12px;
  background:rgba(14,20,27,.9);color:var(--white);
  border:1px solid var(--line);
  font-size:12px;letter-spacing:.1em;cursor:pointer;
  transition:border-color .2s,color .2s,background .2s;
}
.nav-toggle:hover{border-color:var(--green);color:var(--green)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:var(--green);transition:transform .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(2.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* ---------- nav : mobile bottom drawer ---------- */
.site-nav{
  position:fixed;left:0;right:0;bottom:0;z-index:80;
  display:flex;flex-direction:column;
  max-height:78vh;overflow-y:auto;
  padding:20px 18px calc(20px + env(safe-area-inset-bottom,0px));
  background:linear-gradient(180deg,#0E141B 0%,#070A0F 100%);
  border-top:1px solid rgba(184,255,44,.55);
  box-shadow:0 -28px 64px -30px #000;
  transform:translateY(106%);
  visibility:hidden;
  transition:transform .38s var(--ease),visibility .38s linear;
}
.site-nav[data-open]{transform:translateY(0);visibility:visible}
.site-nav__hint{
  margin:0 0 10px;color:var(--line);
  font-family:var(--ff-mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;
}
.site-nav__list{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.site-nav__link{
  display:flex;align-items:baseline;gap:12px;
  padding:11px 12px;
  color:var(--grey);text-decoration:none;
  border-left:2px solid transparent;
  transition:color .2s,background .2s,border-color .2s;
}
.site-nav__link:hover{color:var(--white);background:rgba(55,167,255,.09);border-left-color:var(--blue)}
.site-nav__link[aria-current="page"]{
  color:var(--white);
  border-left-color:var(--green);
  background:linear-gradient(90deg,rgba(184,255,44,.17),rgba(184,255,44,0));
}
.site-nav__idx{font-family:var(--ff-mono);font-size:10px;letter-spacing:.12em;color:var(--line)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--green)}
.site-nav__txt{font-size:14px;letter-spacing:.03em;line-height:1.4}

.site-nav__cta{margin-top:18px;width:100%;font-size:12.5px;padding:12px 10px;line-height:1.35;letter-spacing:.04em}

.rail__progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(85,96,107,.28);pointer-events:none;
}
.rail__progress span{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--green),var(--blue));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}
.rail__backdrop{
  position:fixed;inset:0;z-index:70;
  background:rgba(7,10,15,.74);
  opacity:0;visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s linear;
}
.rail__backdrop.is-open{opacity:1;visibility:visible}

/* ---------- header shell : desktop rail ---------- */
@media (min-width:960px){
  body{padding-left:var(--rail-w)}
  .site-header{
    position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);
    border-bottom:0;border-right:1px solid var(--line-soft);
    background:linear-gradient(178deg,#0E141B 0%,#080C12 58%,#070A0F 100%);
  }
  .rail{
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:0;height:100%;min-height:0;padding:20px 0 16px;
  }
  .brand{flex-direction:column;align-items:center;gap:10px;padding:0 10px}
  .brand__word{writing-mode:vertical-rl;font-size:12px;letter-spacing:.22em;line-height:1.2}
  .nav-toggle{display:none}
  .site-nav{
    position:static;transform:none;visibility:visible;
    max-height:none;overflow-y:auto;overflow-x:hidden;
    flex:1 1 auto;min-height:0;
    margin-top:16px;padding:0 10px;
    background:none;border:0;box-shadow:none;
    display:flex;flex-direction:column;
  }
  .site-nav__hint{display:none}
  .site-nav__list{flex:1 1 auto;display:flex;flex-direction:column;justify-content:center;gap:4px}
  .site-nav__link{
    flex-direction:column;align-items:center;gap:3px;
    padding:9px 4px;text-align:center;
    border-left:0;border-top:2px solid transparent;
  }
  .site-nav__link:hover{background:rgba(55,167,255,.08);border-top-color:var(--blue)}
  .site-nav__link[aria-current="page"]{
    border-top-color:var(--green);
    background:linear-gradient(180deg,rgba(184,255,44,.16),rgba(184,255,44,0));
  }
  .site-nav__txt{font-size:12px;letter-spacing:.02em}
  .site-nav__cta{margin-top:14px;width:100%;font-size:11.5px;padding:10px 4px;letter-spacing:.02em}
  .rail__backdrop{display:none}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:1px solid transparent;
  font-size:13px;font-weight:600;letter-spacing:.05em;text-decoration:none;
  cursor:pointer;
  transition:transform .2s var(--ease),background .2s,color .2s,border-color .2s,box-shadow .26s;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--primary{
  background:var(--green);color:#070A0F;font-weight:700;
  box-shadow:0 12px 26px -18px rgba(184,255,44,.95);
}
.btn--primary:hover{background:#c9ff60;color:#070A0F;box-shadow:0 16px 32px -16px rgba(184,255,44,.85)}
.btn--ghost{background:transparent;color:var(--white);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--green);color:var(--green)}
.btn--warm{background:var(--orange);color:#120802;font-weight:700}
.btn--warm:hover{background:#ffa055;color:#120802}

/* ---------- layout helpers ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:22px}
@media (min-width:960px){.container{padding-inline:38px}}
.prose{max-width:var(--measure)}
.section{position:relative;padding:56px 0}
@media (min-width:960px){.section{padding:84px 0}}
.rule{height:1px;border:0;margin:0;background:var(--line-soft)}
.index-label{
  display:inline-flex;align-items:center;gap:10px;margin:0 0 14px;
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--green);
}
.index-label::before{content:"";width:26px;height:1px;background:var(--green)}
.data-num{
  font-family:var(--ff-mono);font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;color:var(--blue);
}
.grid{display:grid;gap:22px;grid-template-columns:minmax(0,1fr)}
.grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (min-width:760px){.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1080px){.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:20px 0 4px;
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.12em;color:var(--grey);
}
.breadcrumbs a{color:var(--grey);text-decoration:none;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.breadcrumbs a:hover{color:var(--green);border-bottom-color:rgba(184,255,44,.55)}
.breadcrumbs .sep{color:var(--line)}
.breadcrumbs [aria-current]{color:var(--white)}

/* ---------- media frames (CSS-only placeholder) ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line-soft);
  background:
    linear-gradient(155deg,rgba(55,167,255,.18),rgba(7,10,15,0) 58%),
    linear-gradient(0deg,rgba(18,53,31,.92),rgba(14,20,27,.96)),
    var(--navy);
  box-shadow:inset 0 0 0 1px rgba(248,250,245,.04),0 30px 60px -52px #000;
}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background-image:
    linear-gradient(rgba(184,255,44,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(184,255,44,.10) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.42;
}
.media-frame > img,.media-frame > svg,.media-frame > video{
  position:relative;z-index:1;display:block;width:100%;height:100%;object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__tag{
  position:absolute;left:0;bottom:0;z-index:3;
  padding:6px 12px;background:var(--green);color:#070A0F;
  font-family:var(--ff-mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;
}

/* ---------- section index links ---------- */
.index-link{
  display:flex;align-items:baseline;gap:10px;
  padding:8px 10px;
  color:var(--grey);text-decoration:none;font-size:13px;line-height:1.5;
  border-left:2px solid rgba(85,96,107,.5);
  transition:color .2s,border-color .2s,background .2s;
}
.index-link:hover{color:var(--white);border-left-color:var(--blue)}
.index-link.is-active{
  color:var(--white);border-left-color:var(--green);
  background:linear-gradient(90deg,rgba(184,255,44,.13),transparent);
}

/* ---------- back to top ---------- */
.to-top{
  position:fixed;right:18px;bottom:18px;z-index:55;
  display:grid;place-items:center;width:46px;height:46px;
  padding:0;border:1px solid rgba(184,255,44,.55);
  background:rgba(14,20,27,.94);color:var(--green);
  font-family:var(--ff-mono);font-size:16px;line-height:1;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s linear,background .2s,color .2s;
}
.to-top.is-on{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--green);color:#070A0F}
@media (min-width:960px){.to-top{right:28px;bottom:28px}}

/* ---------- footer ---------- */
.site-footer{
  position:relative;margin-top:64px;
  background:linear-gradient(180deg,#070A0F 0%,#0A0F16 42%,#0E141B 100%);
  border-top:1px solid var(--line-soft);
  color:var(--grey);
}
.site-footer__edge{
  height:5px;
  background:repeating-linear-gradient(115deg,
    rgba(184,255,44,.85) 0 20px,
    rgba(55,167,255,.5) 20px 40px,
    rgba(85,96,107,.25) 40px 60px);
  opacity:.55;
}
.site-footer__inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:48px 22px 32px;
  display:grid;gap:34px;
}
.site-footer__brand{max-width:34em}
.footer__logo{
  margin:0 0 12px;color:var(--white);
  font-size:19px;font-weight:800;letter-spacing:.06em;line-height:1.2;
}
.footer__logo::before{
  content:"";display:inline-block;width:10px;height:10px;margin-right:10px;
  background:var(--green);vertical-align:2px;
}
.footer__summary{margin:0 0 16px;font-size:13.5px;line-height:1.85;color:var(--grey)}
.footer__badge{
  display:inline-block;margin:0;padding:5px 12px;
  border:1px solid rgba(184,255,44,.45);color:var(--green);
  font-family:var(--ff-mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;
}
.footer__grid{display:grid;gap:26px;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.footer__col{min-width:0}
.footer__col--contact{grid-column:1/-1;border-top:1px solid var(--line-soft);padding-top:20px}
.footer__title{
  margin:0 0 12px;color:var(--white);
  font-size:11px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
}
.footer__title--sub{margin-top:22px;color:var(--grey)}
.footer__list{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.footer__link{
  display:inline-block;padding:4px 0;
  color:var(--grey);text-decoration:none;font-size:13.5px;
  border-bottom:1px solid transparent;
  transition:color .2s,border-color .2s;
}
.footer__link:hover{color:var(--green);border-bottom-color:rgba(184,255,44,.5)}
.footer__meta{
  margin:0 0 6px;font-size:13px;line-height:1.7;color:var(--grey);
  font-family:var(--ff-mono);letter-spacing:.01em;
  overflow-wrap:anywhere;
}
.footer__meta:last-child{margin-bottom:0}
.site-footer__base{
  max-width:var(--maxw);margin-inline:auto;
  padding:18px 22px 26px;
  border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;gap:6px 24px;
}
.site-footer__base .footer__meta{margin:0;font-size:11px;letter-spacing:.1em;color:var(--line)}

@media (min-width:560px){
  .footer__col--contact{grid-column:1/-1}
}
@media (min-width:820px){
  .site-footer__inner{grid-template-columns:1.05fr 1.55fr;gap:48px;padding:64px 38px 40px}
  .footer__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer__col--contact{grid-column:1/-1;padding-top:24px}
  .site-footer__base{padding:20px 38px 30px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
}