:root{
  --deep:#070B12;
  --night:#0D1520;
  --card:#16222F;
  --steel:#22303F;
  --cyan:#2FE3D0;
  --orange:#FF6A2B;
  --yellow:#FFD23F;
  --fog:#EDF2F7;
  --ash:#9FB0C2;
  --smoke:#5A6B7D;

  --font-display:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  --shell:1280px;
  --gutter:24px;
  --unit:8px;

  --dur:200ms;
  --scan:240ms;
  --ease:cubic-bezier(.2,.7,.2,1);
}

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

body{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--fog);
  background-color:var(--deep);
  background-image:
    radial-gradient(110% 55% at 78% -12%, rgba(47,227,208,.10), transparent 62%),
    radial-gradient(70% 45% at 6% -8%, rgba(255,106,43,.07), transparent 66%),
    linear-gradient(90deg, rgba(34,48,63,.38) 1px, transparent 1px),
    linear-gradient(180deg, rgba(34,48,63,.24) 1px, transparent 1px);
  background-size:auto, auto, 120px 120px, 120px 120px;
  background-repeat:no-repeat, no-repeat, repeat, repeat;
  background-position:center top;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.02em;
  color:var(--fog);
}
h1{font-size:clamp(34px,5.4vw,56px);font-weight:900}
h2{font-size:clamp(28px,3.6vw,40px)}
h3{font-size:clamp(20px,2.2vw,24px);line-height:1.3}
h4{font-size:18px;line-height:1.4}

p{max-width:72ch}
strong{font-weight:700;color:var(--fog)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
a:focus-visible,.btn:focus-visible,.copy-chip:focus-visible,.nav-toggle:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--cyan);color:var(--deep)}

#main-content{scroll-margin-top:16px}

.shell{
  width:100%;
  max-width:calc(var(--shell) + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.mono{
  font-family:var(--font-mono);
  font-weight:500;
  letter-spacing:.02em;
}

/* ============ header ============ */
.site-header{
  position:relative;
  z-index:20;
  background:var(--deep);
  border-bottom:1px solid var(--steel);
}

.skip-link{
  position:absolute;
  left:16px;
  top:-80px;
  z-index:140;
  display:inline-block;
  padding:12px 18px;
  background:var(--cyan);
  color:var(--deep);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.08em;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

.masthead-band{
  background:var(--night);
  border-bottom:1px solid var(--steel);
}
.masthead-band__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 16px;
  min-height:40px;
  padding-block:6px;
}
.masthead-band__tag{
  padding:2px 8px;
  background:var(--cyan);
  color:var(--deep);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.16em;
}
.masthead-band__text{
  flex:1 1 auto;
  max-width:none;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.06em;
  color:var(--ash);
}
.masthead-band__meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--smoke);
  white-space:nowrap;
}

.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px 16px;
  padding-top:20px;
  padding-bottom:16px;
}
.masthead__aside{
  justify-self:start;
  display:flex;
  align-items:center;
  gap:8px;
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--smoke);
  white-space:nowrap;
}
.masthead__aside::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--orange);
  flex:0 0 auto;
}

.brand{
  justify-self:center;
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:4px;
  text-align:center;
}
.brand__mark{
  position:relative;
  display:inline-block;
  padding-bottom:3px;
  font-family:var(--font-display);
  font-size:clamp(22px,3vw,30px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1;
  color:var(--fog);
}
.brand__mark::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.brand:hover .brand__mark::after,
.brand:focus-visible .brand__mark::after{transform:scaleX(1)}
.brand__sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.36em;
  text-transform:uppercase;
  color:var(--ash);
}

.nav-toggle{
  display:none;
  justify-self:end;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border:1px solid var(--steel);
  color:var(--fog);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  gap:4px;
  width:18px;
}
.nav-toggle__bars i{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle__label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
}
.nav-toggle[aria-expanded="true"]{color:var(--cyan);border-color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.primary-nav{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:6px 28px;
  padding-top:2px;
  padding-bottom:16px;
  border-top:1px solid var(--steel);
  padding-top:12px;
}
.primary-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:2px 24px;
}
.primary-nav__list a{
  position:relative;
  display:inline-block;
  padding:8px 2px 10px;
  font-size:15px;
  font-weight:500;
  color:var(--fog);
  transition:color var(--dur) var(--ease);
}
.primary-nav__list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:2px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.primary-nav__list a:hover::after,
.primary-nav__list a:focus-visible::after{transform:scaleX(1)}
.primary-nav__list a:hover{color:var(--cyan)}
.primary-nav__list a[aria-current="page"]{color:var(--cyan);font-weight:700}
.primary-nav__list a[aria-current="page"]::after{transform:scaleX(1);height:3px}
.primary-nav__cta{flex:0 0 auto}

.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:rgba(34,48,63,.72);
  z-index:130;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:100%;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 90ms linear;
}

/* ============ buttons / tags ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid transparent;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.1em;
  line-height:1.2;
  text-align:center;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn--primary{background:var(--orange);color:var(--deep);border-color:var(--orange)}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--cyan);border-color:var(--cyan);color:var(--deep)}
.btn--ghost{background:transparent;color:var(--fog);border-color:var(--steel)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}

.tag{
  display:inline-block;
  padding:3px 8px;
  border:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--ash);
  white-space:nowrap;
}
.tag--live{
  background:var(--yellow);
  border-color:var(--yellow);
  color:var(--deep);
}

/* ============ content primitives ============ */
.eyebrow{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:28px;
  height:1px;
  background:currentColor;
  flex:0 0 auto;
}

.section{
  padding-block:56px;
  border-top:1px solid var(--steel);
}
.section__head{
  display:flex;
  align-items:flex-end;
  flex-wrap:wrap;
  gap:14px 24px;
  margin-bottom:28px;
}
.section__num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(40px,7vw,72px);
  font-weight:500;
  line-height:1;
  letter-spacing:-.03em;
  color:var(--steel);
}
.has-js .section__num{opacity:.42;transition:opacity 260ms var(--ease)}
.has-js .section__num.is-in{opacity:1}

.grid{
  display:grid;
  gap:calc(var(--unit) * 3);
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--main{grid-template-columns:minmax(0,7fr) minmax(0,3fr)}

.card{
  position:relative;
  padding:22px 20px;
  background:var(--card);
  border:1px solid var(--steel);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:2px;
  background:var(--cyan);
  transform:scaleY(0);
  transform-origin:top center;
  transition:transform var(--scan) var(--ease);
}
.card:hover,.card:focus-within{
  border-color:rgba(47,227,208,.55);
  transform:translateY(-3px);
}
.card:hover::before,.card:focus-within::before{transform:scaleY(1)}
.card__title{
  font-family:var(--font-display);
  font-size:18px;
  font-weight:700;
  line-height:1.35;
  letter-spacing:-.01em;
}
.card__meta{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ash);
}

.data-strip{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 32px;
  padding:14px 20px;
  background:var(--night);
  border-top:1px solid var(--steel);
  border-bottom:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--ash);
}
.data-strip__item{display:inline-flex;align-items:center;gap:8px}
.data-strip__value{color:var(--cyan);font-weight:600}

.breadcrumb{
  padding-block:14px;
  border-bottom:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ash);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.breadcrumb__item{display:inline-flex;align-items:center}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  margin-right:8px;
  color:var(--smoke);
}
.breadcrumb__link{
  color:var(--ash);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.breadcrumb__link:hover,.breadcrumb__link:focus-visible{color:var(--cyan);border-color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--fog)}

.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.75;
  color:var(--ash);
}
.prose > * + *{margin-top:1.2em}
.prose h2,.prose h3,.prose h4{color:var(--fog)}
.prose h2{margin-top:2em;font-size:clamp(26px,3.4vw,32px)}
.prose h3{margin-top:1.6em;font-size:20px}
.prose ul,.prose ol{margin-top:1.2em}
.prose li{
  position:relative;
  padding-left:20px;
  margin-top:.6em;
}
.prose ul > li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:6px;
  height:6px;
  background:var(--cyan);
}
.prose ol{counter-reset:step}
.prose ol > li{padding-left:28px}
.prose ol > li::before{
  counter-increment:step;
  content:counter(step,decimal-leading-zero);
  position:absolute;
  left:0;
  top:0;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--cyan);
}
.prose a{
  color:var(--cyan);
  border-bottom:1px solid rgba(47,227,208,.45);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.prose a:hover{border-bottom-color:var(--cyan);color:var(--fog)}
.prose .mono{color:var(--fog)}

.figure{margin:0}
.figure__frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:var(--card);
  border:1px solid var(--steel);
}
.figure__frame > *{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__placeholder{
  background-color:var(--card);
  background-image:
    repeating-linear-gradient(135deg, rgba(34,48,63,.85) 0 1px, transparent 1px 14px),
    radial-gradient(90% 70% at 80% 0%, rgba(47,227,208,.12), transparent 70%);
}
.figure__caption{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.6;
  letter-spacing:.06em;
  color:var(--ash);
}
.figure--wide .figure__frame{aspect-ratio:21 / 9}
.figure--tall .figure__frame{aspect-ratio:4 / 5}

.slant-mark{
  display:block;
  width:64px;
  height:2px;
  background:var(--orange);
  transform:rotate(-8deg);
  transform-origin:left center;
}

.has-js [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity 260ms var(--ease),transform 260ms var(--ease);
}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ============ footer ============ */
.site-footer{
  margin-top:auto;
  background:var(--night);
  border-top:1px solid var(--steel);
}
.footer-strip{
  background:var(--card);
  border-bottom:1px solid var(--steel);
}
.footer-strip__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 14px;
  min-height:44px;
  padding-block:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ash);
}
.footer-strip__label{
  padding:2px 8px;
  background:var(--yellow);
  color:var(--deep);
  font-weight:600;
  letter-spacing:.16em;
}
.footer-strip__data{
  flex:1 1 auto;
  max-width:none;
  line-height:1.6;
}
.footer-strip__dot{
  width:8px;
  height:8px;
  flex:0 0 auto;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(47,227,208,.16);
}

.footer-body{
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1fr) minmax(0,1fr);
  gap:40px 32px;
  padding-top:48px;
  padding-bottom:48px;
}
.footer-brand__mark{
  font-family:var(--font-display);
  font-size:24px;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--fog);
}
.footer-brand__sub{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--ash);
}
.footer-brand__note{
  margin-top:14px;
  max-width:26ch;
  font-size:14px;
  line-height:1.7;
  color:var(--ash);
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.footer-col__title{
  margin-bottom:12px;
  padding-bottom:8px;
  border-bottom:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--smoke);
}
.footer-col__list li + li{margin-top:8px}
.footer-col__list a{
  display:inline-block;
  padding-bottom:2px;
  font-size:14px;
  color:var(--ash);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-col__list a:hover,
.footer-col__list a:focus-visible{color:var(--fog);border-bottom-color:var(--cyan)}

.footer-contact__title{
  margin-bottom:12px;
  padding-bottom:8px;
  border-bottom:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--smoke);
}
.footer-contact__line{
  max-width:34ch;
  margin-bottom:6px;
  font-size:13px;
  line-height:1.7;
  color:var(--ash);
}
.copy-chip{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  width:100%;
  max-width:340px;
  margin:2px 0 12px;
  padding:8px 12px;
  background:var(--card);
  border:1px solid var(--steel);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--fog);
  text-align:left;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.copy-chip:hover,.copy-chip:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.copy-chip__label{overflow-wrap:anywhere}
.copy-chip__hint{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--cyan);
  opacity:0;
  transition:opacity var(--dur) var(--ease);
}
.copy-chip__hint[data-state="done"]{opacity:1}

.footer-legal{
  border-top:1px solid var(--steel);
  background:var(--deep);
}
.footer-legal__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 24px;
  padding-top:18px;
  padding-bottom:22px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--smoke);
}
.footer-legal__inner p{max-width:none}
.footer-legal__note{margin-left:auto;color:var(--ash)}

/* ============ responsive ============ */
@media (max-width:1024px){
  .footer-body{
    grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  }
  .footer-brand{grid-column:1 / -1}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--main{grid-template-columns:1fr}
}

@media (max-width:880px){
  :root{--gutter:20px}
  .masthead-band__meta{display:none}
  .masthead-band__text{font-size:11.5px}
  .masthead__aside{display:none}
  .masthead{padding-top:16px;padding-bottom:14px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding-top:0;
    padding-bottom:14px;
    border-top:1px solid var(--steel);
  }
  .primary-nav[data-open]{display:flex}
  .primary-nav__list{
    flex-wrap:nowrap;
    justify-content:flex-start;
    gap:0;
    overflow-x:auto;
    overscroll-behavior-x:contain;
    scroll-snap-type:x proximity;
    padding-bottom:2px;
  }
  .primary-nav__list li{
    flex:0 0 auto;
    scroll-snap-align:start;
    border-right:1px solid var(--steel);
  }
  .primary-nav__list li:first-child{border-left:1px solid var(--steel)}
  .primary-nav__list a{
    display:block;
    padding:13px 16px;
    font-size:14px;
    white-space:nowrap;
  }
  .primary-nav__list a::after{display:none}
  .primary-nav__list a[aria-current="page"]{background:var(--card)}
  .primary-nav__cta{margin-top:14px;align-self:flex-start}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .section{padding-block:40px}
  .footer-body{grid-template-columns:1fr;gap:32px;padding-top:36px;padding-bottom:36px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 20px}
  .footer-legal__note{margin-left:0}
}

@media (max-width:620px){
  :root{--gutter:16px}
  body{font-size:16px}
  .masthead-band__inner{gap:6px 12px}
  .brand__sub{letter-spacing:.26em}
  .section__head{gap:10px 16px}
  .data-strip{gap:8px 20px;padding:12px 16px}
  .footer-nav{grid-template-columns:1fr}
  .copy-chip{max-width:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .has-js .section__num{opacity:1}
  .card:hover,.card:focus-within{transform:none}
  .btn--ghost:hover,.btn--ghost:focus-visible{transform:none}
  .scroll-progress__bar{transition:none}
}