*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
:root{
  --ink-900:#041512;
  --ink-800:#08251D;
  --ink-700:#0E3328;
  --line:#16473A;
  --neon:#3DF5D0;
  --mint:#9CFFF0;
  --amber:#FF8A3D;
  --amber-soft:#FFC08F;
  --text:#D8FFF8;
  --muted:#7FA89C;
  --dim:#2B5D50;
  --white:#F4FFFC;
  --font-display:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --gutter:clamp(1rem,4vw,2.5rem);
  --shell:1240px;
  --ease:180ms ease;
}
body{
  margin:0;
  background-color:var(--ink-900);
  background-image:
    linear-gradient(180deg,rgba(61,245,208,.045),rgba(4,21,18,0) 38%),
    repeating-linear-gradient(90deg,rgba(22,71,58,.32) 0 1px,rgba(0,0,0,0) 1px 104px);
  color:var(--text);
  font-family:var(--font-body);
  font-size:.95rem;
  font-weight:400;
  line-height:1.78;
  letter-spacing:.01em;
  min-height:100vh;
}
img,svg{max-width:100%;display:block}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.12;
  letter-spacing:-.015em;
  color:var(--white);
  margin:0 0 .55em;
}
p{margin:0 0 1em}
a{color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit}
#main-content{scroll-margin-top:6.5rem}
.container{
  width:min(var(--shell),100% - var(--gutter) * 2);
  margin-inline:auto;
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:.02em;
}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:2px}
.skip-link{
  position:fixed;
  top:.6rem;left:.6rem;
  z-index:300;
  padding:.65rem 1.1rem;
  background:var(--neon);
  color:#04150f;
  font-weight:700;
  font-size:.85rem;
  text-decoration:none;
  border-radius:2px;
  transform:translateY(-160%);
  transition:transform var(--ease);
}
.skip-link:focus{transform:translateY(0)}
/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(4,21,18,.92);
  backdrop-filter:blur(10px) saturate(1.1);
  border-bottom:1px solid var(--line);
}
.header__inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(.8rem,2vw,2rem);
  padding-block:.7rem;
}
.progress-rail{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(22,71,58,.55);
  overflow:hidden;
  pointer-events:none;
}
.progress-rail__bar{
  display:block;
  width:100%;height:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--neon) 0%,var(--mint) 42%,var(--amber) 100%);
  transition:transform .12s linear;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:.65rem;
  text-decoration:none;
  color:var(--white);
  flex:0 0 auto;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:38px;height:38px;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:.86rem;
  letter-spacing:.02em;
  color:#04150f;
  background:linear-gradient(140deg,var(--neon),#1fbfa2);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  transition:transform var(--ease);
}
.brand:hover .brand__mark{transform:translateY(-1px)}
.brand__text{display:grid;line-height:1.18}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:1rem;
  letter-spacing:.01em;
  color:var(--white);
}
.brand__meta{
  font-size:.58rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--muted);
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .7rem;
  background:var(--ink-700);
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--mint);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color var(--ease),color var(--ease);
}
.nav-toggle:hover{border-color:var(--neon);color:var(--neon)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;width:100%;
  background:currentColor;
  transition:transform var(--ease),opacity var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}
.cmd-nav{
  justify-self:center;
  border:1px solid var(--line);
  background:rgba(8,37,29,.7);
  padding:3px;
  border-radius:2px;
}
.cmd-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  counter-reset:navidx;
}
.cmd-nav__link{
  display:flex;
  align-items:baseline;
  gap:.38rem;
  padding:.42rem .68rem;
  font-size:.85rem;
  font-weight:500;
  line-height:1.4;
  color:var(--text);
  text-decoration:none;
  border:1px solid transparent;
  border-radius:1px;
  white-space:nowrap;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.cmd-nav__link::before{
  counter-increment:navidx;
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:.58rem;
  letter-spacing:.06em;
  color:var(--dim);
  transition:color var(--ease);
}
.cmd-nav__link:hover{background:var(--ink-700);border-color:var(--line);color:var(--white)}
.cmd-nav__link:hover::before{color:var(--mint)}
.cmd-nav__link[aria-current="page"]{
  color:var(--neon);
  background:rgba(61,245,208,.09);
  border-color:rgba(61,245,208,.28);
}
.cmd-nav__link[aria-current="page"]::before{color:var(--neon)}
.cmd-nav__foot{
  display:none;
  margin:0;
  font-size:.66rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
}
.header__aside{display:flex;align-items:center;gap:.8rem;justify-self:end}
.header__status{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  margin:0;
  font-size:.66rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--muted);
  white-space:nowrap;
}
.status-dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--neon);
  box-shadow:0 0 0 4px rgba(61,245,208,.14);
  animation:pulse 2.8s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 4px rgba(61,245,208,.14)}
  50%{box-shadow:0 0 0 7px rgba(61,245,208,.05)}
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.62rem 1.05rem;
  font-family:var(--font-display);
  font-weight:700;
  font-size:.86rem;
  letter-spacing:.02em;
  line-height:1.3;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:2px;
  cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.btn--primary{background:var(--neon);color:#04150f;border-color:var(--neon)}
.btn--primary:hover{background:var(--mint);border-color:var(--mint)}
.btn--ghost{background:transparent;color:var(--mint);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon)}
.header__cta{
  clip-path:polygon(0 0,100% 0,100% 100%,9px 100%,0 calc(100% - 9px));
  padding-right:1.2rem;
  white-space:nowrap;
}
/* ---------- generic page components ---------- */
.section{padding-block:clamp(2.6rem,7vw,5.5rem)}
.section__title{font-size:clamp(1.8rem,4vw,3.6rem);margin-bottom:.4em}
.section__lede{max-width:56ch;color:var(--muted);font-size:1rem}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  margin:0 0 .9rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--neon);
}
.kicker::before{content:"";width:24px;height:1px;background:linear-gradient(90deg,var(--neon),rgba(61,245,208,0))}
.rule{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--line),rgba(22,71,58,0))}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.8rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
.card{
  position:relative;
  padding:clamp(1.1rem,2vw,1.6rem);
  background:var(--ink-700);
  border:1px solid var(--line);
  border-radius:2px;
  transition:border-color var(--ease),background var(--ease);
}
.card:hover{border-color:var(--dim);background:#103A2D}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.2rem .55rem;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--mint);
  border:1px solid var(--dim);
  background:rgba(61,245,208,.07);
  border-radius:1px;
}
.tag--amber{color:var(--amber-soft);border-color:rgba(255,138,61,.42);background:rgba(255,138,61,.1)}
.diag-block{position:relative;overflow:hidden;background:var(--ink-800);border:1px solid var(--line)}
.diag-block::after{
  content:"";position:absolute;inset:auto 0 0 auto;width:58%;height:100%;
  background:linear-gradient(150deg,rgba(61,245,208,.1),rgba(4,21,18,0) 62%);
  clip-path:polygon(38% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.link-underline{
  color:var(--text);
  text-decoration:none;
  background-image:linear-gradient(var(--neon),var(--neon));
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:0 1px;
  transition:background-size var(--ease),color var(--ease);
}
.link-underline:hover{color:var(--neon);background-size:100% 1px}
.breadcrumb{margin-block:1.1rem}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:.3rem;font-family:var(--font-mono);font-size:.72rem;color:var(--muted)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.3rem}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--dim)}
.breadcrumb__link{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent;transition:color var(--ease),border-color var(--ease)}
.breadcrumb__link:hover{color:var(--neon);border-bottom-color:var(--neon)}
.breadcrumb__item[aria-current="page"]{color:var(--text)}
/* ---------- media frame ---------- */
.media-frame{
  position:relative;
  display:block;
  aspect-ratio:16/10;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:2px;
  background:
    radial-gradient(120% 90% at 80% 10%,rgba(61,245,208,.18),rgba(4,21,18,0) 58%),
    linear-gradient(160deg,var(--ink-700),var(--ink-900));
  isolation:isolate;
}
.media-frame::after{
  content:"";
  position:absolute;inset:0;
  background:
    repeating-linear-gradient(0deg,rgba(22,71,58,.55) 0 1px,rgba(0,0,0,0) 1px 48px),
    repeating-linear-gradient(90deg,rgba(22,71,58,.55) 0 1px,rgba(0,0,0,0) 1px 48px);
  opacity:.5;
  pointer-events:none;
  z-index:0;
}
.media-frame > img,
.media-frame > svg{
  position:relative;
  z-index:1;
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  margin:0;
  padding:.5rem .7rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--mint);
  background:linear-gradient(0deg,rgba(4,21,18,.92),rgba(4,21,18,0));
}
/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6.5rem);
  background:var(--ink-800);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:2px;
  background:linear-gradient(90deg,var(--neon) 0%,rgba(61,245,208,.28) 26%,rgba(22,71,58,0) 58%,var(--amber) 100%);
  pointer-events:none;
}
.footer__inner{
  display:grid;
  grid-template-columns:1.6fr .85fr .85fr 1.35fr;
  gap:clamp(1.6rem,4vw,3rem);
  padding-block:clamp(2.4rem,6vw,4rem) clamp(1.6rem,4vw,2.4rem);
}
.footer__brand{display:grid;align-content:start;gap:1rem}
.brand--footer .brand__mark{width:34px;height:34px;font-size:.78rem}
.footer__note{
  margin:0;
  max-width:36ch;
  font-size:.86rem;
  line-height:1.8;
  color:var(--muted);
}
.footer__note--small{font-size:.76rem;max-width:38ch;line-height:1.7}
.footer__col{display:grid;align-content:start;gap:.2rem}
.footer__heading{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin:0 0 .9rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--muted);
}
.footer__heading::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line),rgba(22,71,58,0))}
.footer__links{display:grid;gap:.55rem;font-size:.88rem}
.contact-list{display:grid;gap:.7rem;margin:0}
.contact-line{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.4rem .6rem;
  font-size:.82rem;
  line-height:1.6;
}
.contact-line__label{
  flex:0 0 auto;
  font-size:.6rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--dim);
  border:1px solid var(--line);
  padding:.05rem .35rem;
  border-radius:1px;
}
.contact-line__value{color:var(--text);word-break:break-all}
.copy-btn{
  padding:.12rem .5rem;
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--neon);
  background:rgba(61,245,208,.08);
  border:1px solid rgba(61,245,208,.3);
  border-radius:1px;
  cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.copy-btn:hover{background:rgba(61,245,208,.18);border-color:var(--neon)}
.copy-btn[data-copied="true"]{color:#04150f;background:var(--neon);border-color:var(--neon)}
.copy-note{
  margin:.5rem 0 0;
  min-height:1.1em;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.08em;
  color:var(--amber-soft);
}
.footer__legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem 1.4rem;
  padding-block:1.05rem 1.3rem;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1.1rem;margin:0}
.footer__copyright{color:var(--muted)}
.footer__icp{color:var(--dim)}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:.5rem 1.2rem}
.footer__legal-links .link-underline{color:var(--muted);font-size:.7rem}
.footer__legal-links .link-underline:hover{color:var(--neon)}
/* ---------- responsive ---------- */
@media (max-width:1080px){
  .footer__inner{grid-template-columns:1.4fr .8fr .8fr 1.2fr;gap:clamp(1.2rem,3vw,2rem)}
  .header__status{display:none}
}
@media (max-width:980px){
  .header__inner{grid-template-columns:minmax(0,1fr) auto auto}
  .nav-toggle{display:inline-flex}
  .cmd-nav{
    position:absolute;
    top:100%;left:0;right:0;
    display:block;
    justify-self:stretch;
    margin:0;
    padding:.55rem var(--gutter) 1rem;
    border:0;
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    border-radius:0;
    background:var(--ink-800);
    box-shadow:0 24px 48px rgba(0,0,0,.45);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    pointer-events:none;
    transition:opacity var(--ease),transform var(--ease),visibility var(--ease);
  }
  .cmd-nav[data-open="true"]{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .cmd-nav__list{flex-direction:column;align-items:stretch;gap:.1rem}
  .cmd-nav__link{
    padding:.72rem .55rem;
    font-size:.95rem;
    border-bottom:1px solid rgba(22,71,58,.6);
    border-left:2px solid transparent;
  }
  .cmd-nav__link::before{font-size:.64rem}
  .cmd-nav__link[aria-current="page"]{border-left-color:var(--neon)}
  .cmd-nav__foot{display:block;margin-top:.9rem}
  .header__cta{padding:.55rem .8rem;font-size:.8rem}
  .footer__inner{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1 / -1}
}
@media (max-width:620px){
  body{font-size:.92rem}
  .footer__inner{grid-template-columns:1fr;gap:1.8rem}
  .footer__legal{flex-direction:column;align-items:flex-start}
  .header__cta{padding:.5rem .7rem;font-size:.76rem}
  .brand__meta{display:none}
}
@media (max-width:420px){
  .nav-toggle__text{display:none}
  .nav-toggle{padding:.5rem .55rem}
  .header__cta{padding:.48rem .6rem;font-size:.72rem}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .progress-rail__bar{transition:none}
  .status-dot{animation:none}
}