:root{
  --ink:#061A15;
  --panel:#0C2B24;
  --panel-deep:#08201A;
  --line:#1E4A40;
  --cyan:#35F2CE;
  --cyan-soft:#9BFFEA;
  --amber:#F5B841;
  --red:#F25555;
  --yellow:#F2D24B;
  --text:#EAF7F2;
  --muted:#9DBBB3;
  --white:#FFFFFF;
  --wrap:1180px;
  --gutter:clamp(16px,4vw,40px);
  --radius:3px;
  --font-ui:"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background-color:var(--ink);
  color:var(--text);
  font-family:var(--font-ui);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(30,74,64,.30) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,74,64,.30) 1px,transparent 1px);
  background-size:96px 96px;
  -webkit-mask-image:radial-gradient(circle at 50% 18%,#000 0%,transparent 78%);
  mask-image:radial-gradient(circle at 50% 18%,#000 0%,transparent 78%);
  opacity:.55;
}
body > *{position:relative;z-index:1}

h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{max-width:100%}
a{color:var(--cyan);text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
::selection{background:rgba(53,242,206,.28);color:var(--white)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

.wrap{width:min(var(--wrap),calc(100% - var(--gutter) * 2));margin-inline:auto}
.wrap--narrow{width:min(760px,calc(100% - var(--gutter) * 2));margin-inline:auto}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:#04241D;
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .16s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);outline-offset:2px}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(6,26,21,.99),rgba(6,26,21,.94));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  transition:box-shadow .2s ease;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:2px;
  background:linear-gradient(90deg,transparent,rgba(53,242,206,.6),transparent);
}
.site-header[data-scrolled]{
  box-shadow:0 18px 40px -28px rgba(0,0,0,.95);
}

.masthead{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-block:16px;
  transition:padding-block .18s ease;
}
.site-header[data-scrolled] .masthead{padding-block:10px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--text);
  text-decoration:none;
  transition:color .16s ease;
}
.brand__mark{
  width:36px;
  height:36px;
  flex:none;
  display:grid;
  place-items:center;
  border:1px solid var(--cyan);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--cyan);
  box-shadow:inset 0 0 0 3px rgba(53,242,206,.08);
  transition:background .18s ease,box-shadow .18s ease;
}
.brand:hover .brand__mark,
.brand:focus-visible .brand__mark{
  background:rgba(53,242,206,.14);
  box-shadow:inset 0 0 0 3px rgba(53,242,206,.18),0 0 20px -6px rgba(53,242,206,.85);
}
.brand__text{display:flex;flex-direction:column;line-height:1.18}
.brand__name{font-size:19px;font-weight:800;letter-spacing:-.02em}
.brand__tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}
.site-header[data-scrolled] .brand__tag{display:none}

.masthead__actions{display:flex;align-items:center;gap:10px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:40px;
  padding:10px 18px;
  border:1px solid var(--line);
  border-radius:2px;
  background:transparent;
  color:var(--text);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1;
  text-decoration:none;
  transition:background .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04241D;
}
.btn--primary:hover,
.btn--primary:focus-visible{
  background:var(--cyan-soft);
  border-color:var(--cyan-soft);
  color:#04241D;
  box-shadow:0 12px 28px -16px rgba(53,242,206,.9);
}
.btn--ghost{
  color:var(--cyan);
  border-color:rgba(53,242,206,.42);
}
.btn--ghost:hover,
.btn--ghost:focus-visible{
  background:rgba(53,242,206,.12);
  border-color:var(--cyan);
  color:var(--cyan-soft);
}
.masthead__cta{min-height:38px;padding:9px 16px}

/* ---------- nav toggle ---------- */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:40px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--text);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  transition:border-color .16s ease,color .16s ease,background .16s ease;
}
.nav-toggle:hover,
.nav-toggle:focus-visible{border-color:var(--cyan);color:var(--cyan);background:rgba(53,242,206,.08)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:1px;
  background:currentColor;
  transition:transform .18s ease,top .18s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:9px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4.5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4.5px;transform:rotate(-45deg)}

/* ---------- site nav ---------- */
.site-nav{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(12,43,36,.55),rgba(6,26,21,.2));
}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:stretch;
  gap:2px;
}
.site-nav__link{
  position:relative;
  display:block;
  padding:14px 20px;
  color:var(--muted);
  font-size:14px;
  font-weight:600;
  letter-spacing:.05em;
  line-height:1;
  transition:color .16s ease,background .16s ease;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:20px;
  right:20px;
  bottom:0;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible{
  color:var(--text);
  background:rgba(53,242,206,.08);
}
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{
  color:var(--cyan);
  background:rgba(53,242,206,.10);
}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(12,43,36,.92),rgba(6,26,21,1));
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),transparent);
  opacity:.65;
}
.footer-top{
  display:grid;
  grid-template-columns:1.05fr 2fr;
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(40px,6vw,64px);
}
.footer-ident__name{font-size:22px;font-weight:800;letter-spacing:-.02em}
.footer-ident__tag{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--cyan);
}
.footer-ident__note{
  margin-top:16px;
  max-width:26ch;
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,36px);
}
.footer-nav__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--muted);
}
.footer-nav__list li + li{margin-top:10px}
.footer-nav__link{
  position:relative;
  display:inline-block;
  padding-bottom:2px;
  color:var(--text);
  font-size:14px;
  transition:color .16s ease;
}
.footer-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s ease;
}
.footer-nav__link:hover,
.footer-nav__link:focus-visible{color:var(--cyan)}
.footer-nav__link:hover::after,
.footer-nav__link:focus-visible::after{transform:scaleX(1)}
.footer-contact__line{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--text);
  word-break:break-word;
}
.footer-contact__line + .footer-contact__line{margin-top:6px}
.footer-contact__addr{
  margin-top:12px;
  font-size:12.5px;
  line-height:1.65;
  color:var(--muted);
}
.footer-contact__note{
  margin-top:10px;
  padding-left:10px;
  border-left:2px solid rgba(245,184,65,.6);
  font-size:12px;
  line-height:1.6;
  color:var(--muted);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:20px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal__links a{color:var(--muted);transition:color .16s ease}
.footer-legal__links a:hover,
.footer-legal__links a:focus-visible{color:var(--cyan)}
.footer-legal__icp{color:var(--muted)}

/* ---------- breadcrumbs ---------- */
.crumbs{padding-block:18px}
.crumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--muted);
}
.crumbs__list li{display:flex;align-items:center;gap:8px}
.crumbs__list li + li::before{content:"/";color:var(--line)}
.crumbs__list a{color:var(--muted);transition:color .16s ease}
.crumbs__list a:hover,
.crumbs__list a:focus-visible{color:var(--cyan)}
.crumbs__list [aria-current="page"]{color:var(--cyan)}

/* ---------- section head ---------- */
.section{padding-block:clamp(36px,6vw,72px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:clamp(20px,3vw,32px);
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.section__title{
  font-size:clamp(22px,3vw,32px);
  font-weight:800;
  letter-spacing:-.03em;
  line-height:1.2;
}
.section__lead{max-width:40ch;font-size:15px;color:var(--muted)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:20px;height:1px;background:currentColor}

/* ---------- numerals & stats ---------- */
.numeral{
  font-family:var(--font-mono);
  font-weight:800;
  font-size:clamp(48px,9vw,96px);
  line-height:.86;
  letter-spacing:-.04em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}
.stat{
  padding-left:14px;
  border-left:2px solid var(--cyan);
}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(24px,3.4vw,36px);
  font-weight:800;
  line-height:1.1;
  letter-spacing:-.03em;
  color:var(--text);
  font-variant-numeric:tabular-nums;
}
.stat__label{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}

/* ---------- cards ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(12,43,36,.92),rgba(8,32,26,.92));
  transition:border-color .18s ease,box-shadow .18s ease;
}
.card:hover,
.card:focus-within{
  border-color:var(--cyan);
  box-shadow:0 0 0 1px rgba(53,242,206,.16),0 18px 40px -30px rgba(53,242,206,.85);
}
.card__kicker{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--cyan);
}
.card__title{
  font-size:clamp(17px,2vw,21px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.35;
  color:var(--text);
}
.card__title a{color:inherit}
.card__title a:hover,
.card__title a:focus-visible{color:var(--cyan)}
.card__text{margin-top:10px;font-size:14.5px;line-height:1.7;color:var(--muted)}
.card__meta{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--muted);
}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid currentColor;
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  line-height:1.5;
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan)}
.tag--amber{color:var(--amber)}
.tag--red{color:var(--red)}
.tag--yellow{color:var(--yellow)}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:
    radial-gradient(120% 90% at 20% 0%,rgba(53,242,206,.12),transparent 60%),
    linear-gradient(160deg,var(--panel),var(--panel-deep));
}
.media-frame::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(30,74,64,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,74,64,.55) 1px,transparent 1px);
  background-size:28px 28px;
  opacity:.7;
}
.media-frame img,
.media-frame picture,
.media-frame svg{
  position:relative;
  z-index:1;
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--band{aspect-ratio:21/6}
.media-frame__caption{
  position:relative;
  z-index:1;
  margin-top:0;
  padding:10px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
  border-top:1px solid var(--line);
  background:rgba(6,26,21,.6);
}

/* ---------- grids ---------- */
.grid{display:grid;gap:clamp(14px,2vw,22px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- toc ---------- */
.toc{
  padding:18px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(12,43,36,.62);
}
.toc__title{
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--muted);
}
.toc__list li + li{margin-top:6px}
.toc__link{
  display:block;
  padding:7px 10px;
  border-left:2px solid transparent;
  color:var(--muted);
  font-size:14px;
  transition:color .16s ease,border-color .16s ease,background .16s ease;
}
.toc__link:hover,
.toc__link:focus-visible{color:var(--text);background:rgba(53,242,206,.07)}
.toc__link[aria-current="true"]{
  color:var(--cyan);
  border-left-color:var(--cyan);
  background:rgba(53,242,206,.10);
}

/* ---------- prose ---------- */
.prose{max-width:38em;font-size:16px;line-height:1.78;color:var(--text)}
.prose > * + *{margin-top:1.05em}
.prose h2{
  margin-top:2em;
  font-size:clamp(20px,2.4vw,26px);
  font-weight:800;
  letter-spacing:-.025em;
  line-height:1.32;
}
.prose h3{
  margin-top:1.6em;
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
}
.prose ul,.prose ol{max-width:36em}
.prose ul li,.prose ol li{position:relative;padding-left:1.2em;color:var(--muted)}
.prose ul li + li,.prose ol li + li{margin-top:.5em}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:8px;
  height:1px;
  background:var(--cyan);
}
.prose ol{counter-reset:prose}
.prose ol li{counter-increment:prose}
.prose ol li::before{
  content:counter(prose,decimal-leading-zero);
  position:absolute;
  left:0;
  top:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--cyan);
}
.prose a{
  color:var(--cyan);
  border-bottom:1px solid rgba(53,242,206,.45);
  transition:border-color .16s ease,color .16s ease;
}
.prose a:hover,
.prose a:focus-visible{color:var(--cyan-soft);border-bottom-color:var(--cyan-soft)}
.prose blockquote{
  padding:14px 20px;
  border-left:2px solid var(--amber);
  background:rgba(245,184,65,.06);
  color:var(--text);
  font-size:15px;
}
.prose hr{
  height:0;
  border:0;
  border-top:1px solid var(--line);
  margin-block:2em;
}
.prose code{
  padding:2px 6px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--cyan-soft);
}
.lede{font-size:clamp(17px,2vw,19px);line-height:1.72;color:var(--muted);max-width:38ch}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    border-top:1px solid var(--line);
    background:linear-gradient(180deg,rgba(12,43,36,.96),rgba(6,26,21,.99));
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding-block:8px 12px}
  .site-nav__link{
    padding:13px 6px;
    border-bottom:1px solid rgba(30,74,64,.7);
  }
  .site-nav__list > li:last-child .site-nav__link{border-bottom:0}
  .site-nav__link::after{display:none}
  .footer-top{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  body{font-size:15.5px}
  .masthead__cta{display:none}
  .brand__mark{width:32px;height:32px;font-size:11px}
  .brand__name{font-size:17px}
  .site-header[data-scrolled] .brand__tag{display:none}
  .footer-nav{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .prose{font-size:15.5px}
}
@media (max-width:420px){
  .brand__tag{display:none}
}

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