*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,picture{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

:root{
  --night-950:#070C16;
  --night-900:#0B1220;
  --panel-800:#121C2E;
  --red-500:#FF3B30;
  --red-700:#B81F19;
  --cyan-400:#2DE2E6;
  --cyan-200:#A8F7F7;
  --amber-400:#FFC857;
  --paper-50:#F4F7FB;
  --slate-400:#8A97A8;
  --slate-700:#3B4658;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell-max:1240px;
  --gutter:clamp(16px,4vw,40px);
  --radius-card:14px;
  --header-h:70px;
}

body{
  font-family:var(--font-body);
  font-size:clamp(16px,0.55vw + 14.5px,18px);
  line-height:1.78;
  font-weight:400;
  color:var(--paper-50);
  background:var(--night-950);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{font-family:var(--font-display);line-height:1.2;letter-spacing:-.01em}
strong{font-weight:700;color:var(--cyan-200)}

:focus-visible{outline:2px solid var(--cyan-400);outline-offset:3px;border-radius:3px}
.site-header :focus-visible{outline-offset:2px}

/* ---------- utilities ---------- */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;
}
.container{
  width:100%;max-width:var(--shell-max);
  margin-inline:auto;padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,6.5vw,96px)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--cyan-400);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--red-500);flex:0 0 auto}
.display-title{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(42px,7vw,104px);line-height:1.02;letter-spacing:-.03em;
}
.page-title{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(32px,4.6vw,64px);line-height:1.08;letter-spacing:-.025em;
}
.lede{
  font-size:clamp(16px,1.1vw,19px);line-height:1.8;
  color:var(--slate-400);max-width:62ch;
}
.surface-light{background:var(--paper-50);color:var(--night-900)}
.surface-light .lede{color:#4A5568}
.surface-light .eyebrow{color:#0E7C7E}
.split-band{
  height:8px;border:0;
  background:repeating-linear-gradient(90deg,var(--red-500) 0 56px,transparent 56px 112px,var(--cyan-400) 112px 168px,transparent 168px 224px);
  opacity:.85;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 22px;
  font-family:var(--font-body);font-weight:700;font-size:15px;letter-spacing:.02em;
  border:1px solid transparent;border-radius:10px 10px 10px 2px;
  cursor:pointer;text-align:center;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.btn--primary{background:var(--red-500);color:#fff;border-color:var(--red-500)}
.btn--primary:hover{background:#FF5A50;border-color:#FF5A50}
.btn--primary:active{background:var(--red-700);border-color:var(--red-700)}
.btn--ghost{background:transparent;border-color:rgba(244,247,251,.26);color:var(--paper-50)}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--cyan-200)}
.btn--sm{min-height:44px;padding:0 16px;font-size:14px}
.surface-light .btn--ghost{border-color:rgba(7,12,22,.25);color:var(--night-900)}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:12px 20px;border-radius:8px;
  background:var(--paper-50);color:var(--night-950);
  font-weight:700;font-size:15px;
  transform:translateY(-240%);
  transition:transform .16s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- scroll progress ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:120;
  background:linear-gradient(90deg,var(--red-500) 0%,var(--amber-400) 45%,var(--cyan-400) 100%);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
  pointer-events:none;
}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:linear-gradient(180deg,rgba(7,12,22,.9) 0%,rgba(7,12,22,.6) 52%,rgba(7,12,22,0) 100%);
  border-bottom:1px solid transparent;
  transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.site-header[data-scrolled="true"]{
  background:var(--night-900);
  border-bottom-color:var(--slate-700);
  box-shadow:0 14px 34px rgba(0,0,0,.5);
}
.site-header__inner{
  display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);
  width:100%;max-width:1400px;margin-inline:auto;
  padding:14px var(--gutter);
  min-height:var(--header-h);
}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__mark,.footer-brand__mark{
  display:grid;place-items:center;
  width:38px;height:38px;
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;
  color:#fff;background:var(--red-500);
  clip-path:polygon(0 0,100% 0,100% 68%,74% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.16}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:17px;letter-spacing:-.01em}
.brand__line{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan-400);
}
.version-badge{
  flex:0 0 auto;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--cyan-200);
  border:1px solid rgba(45,226,230,.36);
  background:rgba(45,226,230,.07);
  padding:5px 9px;border-radius:4px;white-space:nowrap;
}
.nav-toggle{
  display:none;margin-left:auto;
  width:48px;height:48px;flex:0 0 auto;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
  border:1px solid rgba(244,247,251,.24);border-radius:9px;
  transition:border-color .16s ease,background-color .16s ease;
}
.nav-toggle:hover{border-color:var(--cyan-400);background:rgba(45,226,230,.08)}
.nav-toggle__bar{
  display:block;width:20px;height:2px;background:var(--paper-50);border-radius:2px;
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.site-nav{
  display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);
  margin-left:auto;
}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.5vw,22px)}
.site-nav__link{
  position:relative;display:inline-block;
  padding:8px 2px;font-size:15px;font-weight:500;letter-spacing:.02em;
  color:rgba(244,247,251,.78);
  transition:color .16s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:1px;height:2px;
  background:var(--cyan-400);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .16s ease,background-color .16s ease;
}
.site-nav__link:hover{color:var(--paper-50)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--paper-50)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--red-500)}
.header-cta{flex:0 0 auto}

/* ---------- footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,8vw,110px);
  background:var(--night-950);
  border-top:1px solid var(--slate-700);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(244,247,251,.055) 0 1px,transparent 1px 6px);
}
.site-footer::after{
  content:"";position:absolute;top:0;left:0;width:min(300px,42%);height:3px;
  background:linear-gradient(90deg,var(--red-500),var(--cyan-400));
}
.footer-inner{
  position:relative;z-index:1;
  width:100%;max-width:var(--shell-max);margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--gutter) 26px;
}
.footer-top{
  display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,2fr);
  gap:clamp(28px,5vw,64px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-brand__name{font-family:var(--font-display);font-size:22px;font-weight:900;letter-spacing:-.02em}
.footer-brand__desc{
  font-size:15px;line-height:1.8;color:var(--slate-400);max-width:34ch;
}
.footer-columns{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,36px);
}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan-400);margin-bottom:14px;
  padding-bottom:8px;border-bottom:1px solid rgba(59,70,88,.6);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;font-size:15px;color:rgba(244,247,251,.76);
  transition:color .16s ease,padding-left .16s ease;
}
.footer-link:hover{color:var(--cyan-200);padding-left:4px}
.footer-link[aria-current="page"]{color:var(--paper-50);box-shadow:inset 3px 0 0 var(--red-500);padding-left:10px}
.footer-contact{
  margin-top:clamp(30px,4.5vw,52px);
  padding-top:22px;
  border-top:1px dashed var(--slate-700);
  display:grid;gap:9px;
}
.footer-contact__item{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;
  font-size:14px;color:var(--slate-400);
}
.footer-contact__label{
  flex:0 0 auto;min-width:66px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--cyan-400);
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;
  margin-top:26px;padding-top:18px;
  border-top:1px solid var(--slate-700);
  font-size:13px;color:var(--slate-400);
}
.footer-legal__icp{font-family:var(--font-mono);letter-spacing:.02em}
.footer-legal__copy{font-family:var(--font-mono);letter-spacing:.04em}

/* ---------- shared page components ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--slate-400);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--slate-700)}
.breadcrumb a{color:var(--slate-400);transition:color .16s ease}
.breadcrumb a:hover{color:var(--cyan-200)}
.breadcrumb [aria-current="page"]{color:var(--paper-50)}

.data-band{
  display:flex;flex-wrap:wrap;gap:clamp(16px,3vw,42px);
  padding:18px 0;
  border-top:1px solid var(--slate-700);
  border-bottom:1px solid var(--slate-700);
}
.data-band__item{display:flex;flex-direction:column;gap:2px;min-width:96px}
.data-band__value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(20px,2.2vw,28px);line-height:1.1;
  color:var(--cyan-200);font-variant-numeric:tabular-nums;
}
.data-band__label{font-size:12px;letter-spacing:.08em;color:var(--slate-400)}
.surface-light .data-band{border-color:rgba(7,12,22,.15)}
.surface-light .data-band__value{color:#0E7C7E}
.surface-light .data-band__label{color:#5A6779}

.card{
  position:relative;
  background:var(--panel-800);
  border:1px solid var(--slate-700);
  border-radius:var(--radius-card) var(--radius-card) var(--radius-card) 3px;
  padding:clamp(18px,2.2vw,28px);
  transition:border-color .16s ease,transform .16s ease,background-color .16s ease;
}
.card:hover{border-color:rgba(45,226,230,.5)}
.card--notch{
  border-top-right-radius:2px;
  border-bottom-left-radius:2px;
  box-shadow:inset -1px 1px 0 rgba(45,226,230,.22);
}
.card__title{font-family:var(--font-display);font-size:clamp(18px,1.6vw,22px);font-weight:900;letter-spacing:-.015em}
.card__meta{
  margin-top:10px;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--slate-400);
}
.surface-light .card{background:#fff;border-color:rgba(7,12,22,.12)}

.chip-group{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  min-height:40px;padding:0 16px;
  font-size:14px;font-weight:500;
  color:rgba(244,247,251,.82);
  background:rgba(18,28,46,.62);
  border:1px solid var(--slate-700);border-radius:999px;
  transition:border-color .16s ease,background-color .16s ease,color .16s ease;
}
.chip:hover{border-color:rgba(45,226,230,.55);color:var(--paper-50)}
.chip[aria-pressed="true"]{
  border-color:var(--cyan-400);
  background:rgba(45,226,230,.14);
  color:var(--cyan-200);
}
.surface-light .chip{background:#fff;border-color:rgba(7,12,22,.16);color:#26303F}
.surface-light .chip[aria-pressed="true"]{border-color:#0E7C7E;background:rgba(45,226,230,.18);color:#0B4C4E}

.image-frame{
  position:relative;display:block;overflow:hidden;
  background:var(--panel-800);
  border:1px solid var(--slate-700);
  border-radius:var(--radius-card) var(--radius-card) var(--radius-card) 3px;
}
.image-frame__media{
  display:block;width:100%;height:auto;
  aspect-ratio:16/10;object-fit:cover;
  background:linear-gradient(135deg,var(--night-900) 0%,var(--panel-800) 60%,#1A2740 100%);
}
.image-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(7,12,22,.28) 0 1px,transparent 1px 5px);
  opacity:.6;
}
.image-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:1;
  padding:14px 16px;
  font-size:13px;line-height:1.5;color:var(--paper-50);
  background:linear-gradient(0deg,rgba(7,12,22,.94) 0%,rgba(7,12,22,0) 100%);
}
.image-frame--tall .image-frame__media{aspect-ratio:4/5}
.image-frame--wide .image-frame__media{aspect-ratio:21/9}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .version-badge{display:none}
}
@media (max-width:980px){
  .nav-toggle{display:flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    margin-left:0;
    display:none;
    flex-direction:column;align-items:stretch;gap:0;
    padding:10px var(--gutter) 22px;
    background:var(--night-900);
    border-top:1px solid var(--slate-700);
    border-bottom:1px solid var(--slate-700);
    box-shadow:0 22px 44px rgba(0,0,0,.55);
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
  }
  .site-nav[data-open="true"]{display:flex}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{
    display:block;padding:14px 4px;font-size:16px;
    border-bottom:1px solid rgba(59,70,88,.55);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    color:var(--cyan-200);
    box-shadow:inset 3px 0 0 var(--red-500);
    padding-left:14px;
  }
  .header-cta{width:100%;margin-top:18px;min-height:50px}
  .footer-top{grid-template-columns:1fr}
}
@media (max-width:720px){
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
  .footer-legal{justify-content:flex-start}
  .brand__line{display:none}
  .brand__name{font-size:16px}
}
@media (max-width:420px){
  .footer-columns{grid-template-columns:1fr}
  .footer-contact__item{flex-direction:column;gap:2px}
}

@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;
  }
  .scroll-progress{transition:none}
  .site-nav__link:hover::after{transform:scaleX(1)}
}