:root{
  --ink:#081624;
  --abyss:#050F1A;
  --panel:#102A40;
  --panel-2:#163A55;
  --orange:#FF6B2C;
  --orange-soft:#FFA36B;
  --white:#F4F7FA;
  --mist:#9DB2C6;
  --mint:#2ED3B0;
  --mint-deep:#168F79;
  --line:#24445C;
  --rail:88px;
  --header-h:78px;
  --max:1380px;
  --gutter:clamp(16px,3vw,32px);
  --ease:cubic-bezier(.2,.7,.2,1);
  --font-sans:'HarmonyOS Sans SC','Source Han Sans SC','Noto Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono','Sarasa Mono SC','IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
[hidden]{display:none !important}
img{max-width:100%;height:auto}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1em}
a{color:var(--orange-soft);text-decoration:none}
a:hover{color:var(--orange)}
h1,h2,h3,h4{
  margin:0 0 .6em;
  font-weight:800;
  line-height:1.2;
  letter-spacing:.02em;
  color:var(--white);
  text-wrap:balance;
}
h1{font-size:clamp(2.4rem,5vw,4.6rem)}
h2{font-size:clamp(1.8rem,3vw,2.4rem)}
h3{font-size:clamp(1.2rem,1.7vw,1.4rem);line-height:1.35}
hr{border:0;border-top:1px solid var(--line);margin:32px 0}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:2px}

/* ---------- layout helpers ---------- */
.container{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.prose{max-width:70ch;line-height:1.85;color:var(--white)}
.prose p{color:var(--white)}
.prose ul{list-style:none}
.prose ul li{position:relative;padding-left:18px;margin-bottom:.5em}
.prose ul li::before{content:"";position:absolute;left:0;top:.85em;width:8px;height:2px;background:var(--orange)}
.mono{font-family:var(--font-mono);font-size:.95rem;letter-spacing:.06em;color:var(--mint)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--orange);
  text-transform:none;
}
.eyebrow::after{content:"";width:34px;height:1px;background:var(--line)}
.section-title{margin:0 0 12px}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:12px;top:-96px;z-index:200;
  display:inline-flex;align-items:center;
  padding:12px 18px;
  background:var(--orange);color:#160A03;
  font-weight:700;font-size:14px;letter-spacing:.04em;
  border-radius:2px;
  transition:top 180ms var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:10px;color:#160A03}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background 240ms var(--ease),border-color 240ms var(--ease),box-shadow 240ms var(--ease);
}
.site-header[data-scrolled="true"]{
  background:var(--ink);
  border-bottom-color:var(--line);
  box-shadow:0 14px 30px rgba(3,10,18,.55);
}
.site-header__inner{
  display:flex;align-items:stretch;
  width:100%;max-width:var(--max);margin:0 auto;
  padding-left:var(--gutter);padding-right:var(--gutter);
  min-height:var(--header-h);
}
.site-header__rail{
  flex:0 0 var(--rail);width:var(--rail);
  display:flex;align-items:center;
  border-right:1px solid var(--line);
  padding-right:14px;
}
.site-header__main{
  flex:1 1 auto;min-width:0;
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(8px,1.6vw,26px);
}
.scroll-meter{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:transparent;pointer-events:none;overflow:hidden;
}
.scroll-meter__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--orange),var(--mint));
}

/* ---------- brand mark ---------- */
.brandmark{
  display:flex;flex-direction:column;align-items:center;gap:5px;
  width:100%;
  color:var(--white);text-decoration:none;
}
.brandmark:hover{color:var(--white)}
.brandmark__glyph{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;
  border:1px solid var(--orange);
  background:var(--panel);
  color:var(--orange);
  font-family:var(--font-mono);font-size:14px;font-weight:700;letter-spacing:.04em;
  box-shadow:2px 2px 0 var(--abyss);
}
.brandmark__text{
  font-size:12.5px;font-weight:800;letter-spacing:.06em;line-height:1.2;
}
.brandmark__meta{
  font-size:10px;letter-spacing:.08em;color:var(--mist);line-height:1.2;
  text-align:center;
}

/* ---------- navigation ---------- */
.site-nav{min-width:0}
.site-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.site-nav__item{flex:0 0 auto}
.site-nav__link{
  display:flex;align-items:baseline;gap:6px;
  padding:10px 11px;
  border-bottom:2px solid transparent;
  border-radius:2px;
  color:var(--mist);
  text-decoration:none;
  font-size:14px;font-weight:600;letter-spacing:.02em;line-height:1.4;
  white-space:nowrap;
  transition:color 160ms var(--ease),background 160ms var(--ease),border-color 160ms var(--ease);
}
.site-nav__index{
  font-family:var(--font-mono);
  font-size:10px;font-weight:700;letter-spacing:.08em;
  color:var(--orange);
  opacity:.7;
  transition:opacity 160ms var(--ease);
}
.site-nav__label{display:inline-block}
.site-nav__link:hover{color:var(--white);background:var(--panel)}
.site-nav__link:hover .site-nav__index{opacity:1}
.site-nav__link[aria-current="page"]{
  color:var(--white);
  background:rgba(255,107,44,.1);
  border-bottom-color:var(--orange);
}
.site-nav__link[aria-current="page"] .site-nav__index{opacity:1}

/* ---------- header tools ---------- */
.header-tools{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.version-chip{
  display:inline-flex;align-items:center;gap:7px;
  margin:0;padding:5px 10px;
  border:1px solid rgba(22,143,121,.55);
  border-radius:2px;
  background:rgba(22,143,121,.14);
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.06em;line-height:1.4;
  color:var(--white);
  white-space:nowrap;
}
.version-chip__dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--mint);
  box-shadow:0 0 0 3px rgba(46,211,176,.16);
  flex:0 0 auto;
}
.version-chip__code{color:var(--white);font-weight:700}
.version-chip__label{color:var(--mint);font-size:10px;letter-spacing:.1em}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;
  border:1px solid transparent;border-radius:2px;
  background:none;
  font-family:inherit;font-size:14px;font-weight:700;letter-spacing:.03em;line-height:1;
  text-decoration:none;cursor:pointer;
  transition:transform 160ms var(--ease),background 160ms var(--ease),border-color 160ms var(--ease),color 160ms var(--ease),box-shadow 160ms var(--ease);
}
.btn--primary{
  background:var(--orange);color:#160A03;
  box-shadow:2px 2px 0 var(--abyss);
}
.btn--primary:hover{background:var(--orange-soft);color:#160A03;transform:translate(-1px,-1px);box-shadow:3px 3px 0 var(--abyss)}
.btn--ghost{
  border-color:var(--line);
  background:transparent;color:var(--white);
}
.btn--ghost:hover{background:var(--panel);border-color:var(--orange);color:var(--white)}
.btn--compact{padding:9px 13px;font-size:12.5px;letter-spacing:.02em}

/* ---------- nav toggle ---------- */
.nav-toggle{
  display:none;
  position:relative;
  width:42px;height:42px;padding:0;
  border:1px solid var(--line);border-radius:2px;
  background:var(--panel);
  cursor:pointer;
  transition:background 160ms var(--ease),border-color 160ms var(--ease);
}
.nav-toggle:hover{background:var(--panel-2);border-color:var(--orange)}
.nav-toggle__bar{
  position:absolute;left:11px;right:11px;height:2px;
  background:var(--white);
  transition:transform 200ms var(--ease),opacity 160ms var(--ease);
}
.nav-toggle__bar:nth-child(1){top:14px}
.nav-toggle__bar:nth-child(2){top:20px}
.nav-toggle__bar:nth-child(3){top:26px}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- breadcrumb ---------- */
.breadcrumb{margin:0 0 22px}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--mist);
}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";color:var(--line);margin-right:0;
}
.breadcrumb__link{color:var(--mist);text-decoration:none}
.breadcrumb__link:hover{color:var(--orange)}
.breadcrumb__current{color:var(--white);font-weight:700}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);border-radius:2px;
  background:var(--panel);
  font-size:13px;font-weight:700;letter-spacing:.08em;line-height:1.6;
  color:var(--mist);
  white-space:nowrap;
}
.tag--orange{border-color:rgba(255,107,44,.55);background:rgba(255,107,44,.12);color:var(--orange-soft)}
.tag--mint{border-color:rgba(22,143,121,.6);background:rgba(22,143,121,.16);color:var(--mint)}
.tag--mono{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em}

/* ---------- grid & cards ---------- */
.grid{display:grid;gap:clamp(14px,2vw,24px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{
  position:relative;
  padding:22px;
  border:1px solid var(--line);border-radius:2px;
  background:var(--panel);
  box-shadow:2px 2px 0 var(--abyss);
  transition:transform 160ms var(--ease),border-color 160ms var(--ease),background 160ms var(--ease),box-shadow 160ms var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:var(--panel-2);background:var(--panel-2);box-shadow:3px 3px 0 var(--abyss)}
.card__index{
  display:inline-block;margin-bottom:10px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;letter-spacing:.1em;
  color:var(--orange);
}
.card__title{margin:0 0 8px;font-size:1.15rem;font-weight:800;line-height:1.35}
.card__text{margin:0;font-size:15px;line-height:1.8;color:var(--mist)}
.card__meta{
  display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--mist);
}
.card--offset{margin-top:16px}
.card--offset:nth-child(even){margin-top:0;margin-bottom:16px}

/* ---------- filter bar ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 22px}
.filter-bar__btn[aria-pressed="true"]{
  background:var(--orange);border-color:var(--orange);color:#160A03;
  box-shadow:2px 2px 0 var(--abyss);
}
.filter-bar__btn[aria-pressed="true"]:hover{background:var(--orange-soft);border-color:var(--orange-soft);color:#160A03}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:2px;
  background:var(--panel);
  width:100%;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,rgba(36,68,92,.5) 1px,transparent 1px),linear-gradient(rgba(36,68,92,.5) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.35;
}
.media-frame > img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}

/* ---------- reveal ---------- */
.js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 420ms var(--ease),transform 420ms var(--ease);
}
.js [data-reveal][data-revealed="true"]{opacity:1;transform:none}

/* ---------- footer ---------- */
.site-footer{
  background:var(--abyss);
  border-top:1px solid var(--line);
  color:var(--white);
  padding-top:clamp(36px,5vw,64px);
}
.site-footer__inner{
  width:100%;max-width:var(--max);margin:0 auto;
  padding:0 var(--gutter) clamp(28px,4vw,48px);
  display:grid;
  grid-template-columns:minmax(200px,1fr) minmax(280px,1.8fr) minmax(230px,1fr);
  gap:clamp(24px,3.5vw,52px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.footer-brand__line{
  margin:0;
  font-size:clamp(1.05rem,1.6vw,1.25rem);font-weight:800;line-height:1.35;letter-spacing:.02em;
  color:var(--white);
  padding-left:14px;
  border-left:2px solid var(--orange);
}
.footer-brand__note{
  margin:0;
  font-size:14px;line-height:1.85;color:var(--mist);
  max-width:30ch;
}
.footer-cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2vw,32px);
}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11.5px;font-weight:700;letter-spacing:.14em;
  color:var(--mist);
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.footer-col__list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:block;
  padding:5px 0;
  color:var(--white);
  font-size:14.5px;font-weight:500;line-height:1.6;
  text-decoration:none;
  transition:color 160ms var(--ease),padding-left 160ms var(--ease);
}
.footer-link::before{content:"—";color:var(--line);margin-right:8px;transition:color 160ms var(--ease)}
.footer-link:hover{color:var(--orange);padding-left:4px}
.footer-link:hover::before{color:var(--orange)}
.footer-contact{
  display:flex;flex-direction:column;
  padding:18px;
  border:1px solid var(--line);border-radius:2px;
  background:var(--panel);
  box-shadow:2px 2px 0 rgba(3,10,18,.6);
}
.footer-contact .footer-col__title{border-bottom-color:var(--line)}
.footer-contact__row{display:flex;gap:10px;padding:5px 0;font-size:13.5px;line-height:1.7}
.footer-contact__label{
  flex:0 0 36px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--mint);
  padding-top:2px;
}
.footer-contact__value{color:var(--white);word-break:break-word}
.footer-contact__note{
  margin:14px 0 0;padding-top:12px;
  border-top:1px solid var(--line);
  font-size:12.5px;line-height:1.75;color:var(--mist);
}
.footer-legal{border-top:1px solid var(--line);background:var(--abyss)}
.footer-legal__inner{
  width:100%;max-width:var(--max);margin:0 auto;
  padding:18px var(--gutter) 26px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 24px;
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal__link{
  font-size:13px;letter-spacing:.03em;color:var(--mist);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 160ms var(--ease),border-color 160ms var(--ease);
}
.footer-legal__link:hover{color:var(--orange);border-bottom-color:var(--orange)}
.footer-legal__meta{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center}
.footer-legal__icp,.footer-legal__copy{
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.05em;color:var(--mist);
}

/* ---------- responsive ---------- */
@media (max-width:1240px){
  .site-nav__link{padding:9px 7px;font-size:13px}
  .site-nav__index{font-size:9px}
  .version-chip{display:none}
}
@media (max-width:1080px){
  :root{--header-h:68px}
  .site-header__rail{
    width:auto;flex:0 0 auto;
    border-right:0;padding-right:10px;
  }
  .brandmark{flex-direction:row;align-items:center;gap:8px;width:auto}
  .brandmark__glyph{width:30px;height:30px;font-size:12px}
  .brandmark__meta{display:none}
  .site-header__main{justify-content:flex-end}
  .nav-toggle{display:block}
  .site-nav{
    display:none;
    position:absolute;top:100%;left:0;right:0;
    background:var(--abyss);
    border-bottom:1px solid var(--line);
    padding:10px var(--gutter) 20px;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    box-shadow:0 18px 32px rgba(3,10,18,.6);
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{flex:1 1 auto}
  .site-nav__link{
    padding:14px 10px;
    font-size:15px;
    border-bottom:1px solid rgba(36,68,92,.7);
    border-left:2px solid transparent;
    border-radius:0;
  }
  .site-nav__link[aria-current="page"]{
    border-bottom-color:var(--line);
    border-left-color:var(--orange);
    background:rgba(255,107,44,.1);
  }
  .site-footer__inner{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:760px){
  .grid--2,.grid--3{grid-template-columns:1fr}
  .site-footer__inner{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr 1fr}
  .footer-legal__inner{flex-direction:column;align-items:flex-start}
  .btn{padding:11px 16px}
  .header-tools .btn--primary{padding:9px 11px;font-size:11.5px}
}
@media (max-width:420px){
  .brandmark__text{display:none}
  .footer-cols{grid-template-columns:1fr}
}

@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;
  }
  .card:hover,.btn--primary:hover,.footer-link:hover{transform:none;padding-left:0}
  .js [data-reveal]{opacity:1;transform:none}
}