:root{
  --ink:#0A1A2F;
  --ink-2:#10243D;
  --ink-3:#0D2038;
  --cyan:#00E5FF;
  --orange:#FF6B1A;
  --white:#F4F8FB;
  --grey:#A9B7C6;
  --rock:#5E6A75;
  --moss:#6F8F7A;
  --clay:#C57B57;
  --paper:#F2EFE9;

  --line:rgba(169,183,198,.18);
  --line-soft:rgba(169,183,198,.10);
  --line-strong:rgba(169,183,198,.34);
  --cyan-soft:rgba(0,229,255,.10);
  --orange-soft:rgba(255,107,26,.12);

  --font-sans:"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,"Courier New",monospace;

  --fs-h1:clamp(2.4rem,6vw,5rem);
  --fs-h2:clamp(1.6rem,3vw,2.4rem);
  --fs-h3:1.25rem;

  --rail-w:264px;
  --gutter:24px;

  --r-organic:22px 6px 22px 6px;
  --r-soft:14px 4px 14px 4px;
  --r-pill:999px;

  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 620px at 86% -12%,rgba(0,229,255,.10),transparent 62%),
    radial-gradient(760px 520px at 2% 104%,rgba(255,107,26,.09),transparent 64%),
    linear-gradient(to right,rgba(169,183,198,.05) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(169,183,198,.05) 1px,transparent 1px);
  background-size:auto,auto,var(--gutter) var(--gutter),var(--gutter) var(--gutter);
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  color:var(--white);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
}

main{display:block}

img,svg{max-width:100%}
img{height:auto;display:block}

a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--white)}

h1,h2,h3,h4,h5,h6{margin:0;line-height:1.25;font-weight:800;letter-spacing:-.01em}
p{margin:0 0 1.1em}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- layout utilities ---------- */
.wrap{
  width:min(100% - 40px,1080px);
  margin-inline:auto;
}
.wrap--wide{
  width:min(100% - 40px,1280px);
}

.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

.rule{
  height:1px;
  border:0;
  margin:0;
  background:repeating-linear-gradient(to right,var(--line) 0 6px,transparent 6px 14px);
}

.mono{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--rock);
}

.lede{
  font-size:1.06rem;
  line-height:1.9;
  color:var(--grey);
  max-width:60ch;
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:8px;left:8px;
  z-index:200;
  padding:10px 16px;
  background:var(--cyan);
  color:#04121F;
  font-family:var(--font-mono);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.08em;
  border-radius:var(--r-soft);
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#04121F}

/* ---------- scroll progress ---------- */
.scroll-progress{
  position:fixed;
  top:0;left:0;
  height:2px;
  width:0;
  z-index:130;
  pointer-events:none;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--orange) 100%);
  transition:width .12s linear;
}

/* ---------- header ---------- */
.site-header{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:90;
  background:transparent;
  border-right:1px solid transparent;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header.is-solid{
  background:var(--ink-3);
  border-right-color:var(--line);
  box-shadow:1px 0 0 rgba(0,229,255,.10),18px 0 60px rgba(0,0,0,.35);
}

.header-rail{
  display:flex;
  flex-direction:column;
  height:100%;
  padding:30px 22px 26px;
  gap:22px;
}

.header-brand{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:8px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--white);
  text-decoration:none;
}
.brand:hover{color:var(--white)}
.brand-mark{
  display:inline-block;
  padding:5px 8px;
  background:var(--cyan);
  color:#04121F;
  font-family:var(--font-mono);
  font-size:.92rem;
  font-weight:700;
  line-height:1;
  letter-spacing:.08em;
  border-radius:10px 3px 10px 3px;
}
.brand-text{
  font-size:1.04rem;
  font-weight:800;
  letter-spacing:.06em;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.24em;
  color:var(--rock);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  background:transparent;
  border:1px solid rgba(0,229,255,.32);
  border-radius:var(--r-soft);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);background:rgba(0,229,255,.08)}
.nav-toggle-bars{
  position:relative;
  display:inline-block;
  width:16px;
  height:10px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:1.5px;
  background:currentColor;
  transition:transform .18s var(--ease),top .18s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}
.nav-toggle-text{line-height:1}

.site-nav{margin-top:4px;position:relative}

.nav-list{
  display:flex;
  flex-direction:column;
  gap:3px;
}
.nav-item{position:relative}

.nav-link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:9px 12px 9px 15px;
  border:1px solid transparent;
  border-radius:var(--r-soft);
  color:var(--grey);
  font-size:.95rem;
  line-height:1.4;
  text-decoration:none;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.nav-link::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:2px;height:60%;
  background:var(--cyan);
  opacity:0;
  transform:translateY(-50%) scaleY(.35);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.nav-link:hover{
  color:var(--white);
  background:rgba(0,229,255,.07);
  border-color:rgba(0,229,255,.20);
}
.nav-link[aria-current="page"]{
  color:var(--white);
  background:var(--cyan-soft);
  border-color:rgba(0,229,255,.28);
}
.nav-link[aria-current="page"]::before{opacity:1;transform:translateY(-50%) scaleY(1)}

.nav-index{
  flex:0 0 auto;
  min-width:18px;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.1em;
  color:var(--rock);
  transition:color .18s var(--ease);
}
.nav-link:hover .nav-index,
.nav-link[aria-current="page"] .nav-index{color:var(--cyan)}
.nav-label{font-weight:500}

.site-nav::after{
  content:"";
  display:block;
  height:1px;
  margin:14px 12px 0;
  background:repeating-linear-gradient(to right,var(--line) 0 6px,transparent 6px 12px);
}

.header-actions{
  margin-top:auto;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.header-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 14px;
  background:var(--cyan);
  color:#04121F;
  border:1px solid transparent;
  border-radius:var(--r-soft);
  font-family:var(--font-mono);
  font-size:.76rem;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.header-cta:hover{
  background:var(--orange);
  border-color:var(--orange);
  color:#0A1A2F;
  transform:translateY(-2px);
}
.header-note{
  margin:0;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.1em;
  color:var(--rock);
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  background:var(--ink-2);
  border-top:1px solid var(--line);
  color:var(--grey);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;right:0;
  height:3px;
  background:repeating-linear-gradient(to right,rgba(0,229,255,.55) 0 2px,transparent 2px 52px);
  opacity:.7;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:36px;
  padding:56px 0 8px;
  align-items:start;
}

.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-tagline{
  margin:0;
  max-width:30ch;
  font-size:.92rem;
  line-height:1.7;
  color:var(--grey);
}
.footer-icp{
  margin:0;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  color:var(--rock);
}

.footer-cols{
  display:grid;
  gap:28px;
  grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
}
.footer-col{min-width:0}
.footer-title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-list{display:flex;flex-direction:column;gap:8px}
.footer-list a{
  display:inline-block;
  color:var(--grey);
  font-size:.92rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-list a:hover{color:var(--white);border-bottom-color:var(--cyan)}
.footer-list a:focus-visible{color:var(--white)}

.footer-facts{
  margin:0;
  padding:30px 0 0;
  border-top:1px solid var(--line);
  display:grid;
  gap:18px 32px;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
}
.footer-fact{min-width:0}
.footer-facts dt{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--rock);
}
.footer-facts dd{
  margin:4px 0 0;
  color:var(--white);
  font-size:.94rem;
  word-break:break-word;
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  justify-content:space-between;
  align-items:center;
  margin-top:26px;
  padding:20px 0 32px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.08em;
  color:var(--rock);
}
.footer-base p{margin:0}
.footer-domain{color:var(--moss)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 20px;
  background:rgba(0,229,255,.08);
  border:1px solid rgba(0,229,255,.34);
  border-radius:var(--r-soft);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.1em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{
  background:rgba(0,229,255,.16);
  border-color:var(--cyan);
  color:var(--white);
  transform:translateY(-2px);
}
.btn--solid{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04121F;
  font-weight:700;
}
.btn--solid:hover{
  background:var(--orange);
  border-color:var(--orange);
  color:#0A1A2F;
}
.btn--ghost{
  background:transparent;
  border-color:var(--line-strong);
  color:var(--grey);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--white);background:transparent}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-strong);
  border-radius:var(--r-pill);
  color:var(--grey);
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(0,229,255,.40);background:var(--cyan-soft)}
.tag--orange{color:var(--orange);border-color:rgba(255,107,26,.40);background:var(--orange-soft)}
.tag--moss{color:var(--moss);border-color:rgba(111,143,122,.50);background:rgba(111,143,122,.12)}
.tag--clay{color:var(--clay);border-color:rgba(197,123,87,.50);background:rgba(197,123,87,.12)}
.tag--paper{color:var(--ink);border-color:var(--paper);background:var(--paper)}

/* ---------- breadcrumbs ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 26px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--rock);
}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--rock)}
.crumbs a{color:var(--grey);text-decoration:none}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--cyan)}

/* ---------- media placeholders ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:linear-gradient(140deg,var(--ink-2),var(--ink-3) 55%,rgba(0,229,255,.06));
  border:1px solid var(--line);
  border-radius:var(--r-organic);
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x2{aspect-ratio:3/2}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.media--21x9{aspect-ratio:21/9}
.media--free{aspect-ratio:auto}
.media__label{
  position:absolute;
  left:14px;bottom:12px;
  margin:0;
  padding:4px 9px;
  background:rgba(10,26,47,.72);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.12em;
}
.media--edge::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:1px;
  background:linear-gradient(90deg,var(--cyan),transparent 60%);
}

/* ---------- reveal protocol ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}
.js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- desktop rail offset ---------- */
@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
  .site-footer{
    margin-left:calc(-1 * var(--rail-w));
    padding-left:var(--rail-w);
  }
  .footer-top{
    grid-template-columns:minmax(240px,.9fr) minmax(0,2fr);
    gap:48px;
  }
}

/* ---------- mobile / tablet header ---------- */
@media (max-width:1079.98px){
  body{padding-top:64px}

  .site-header{
    top:0;left:0;right:0;bottom:auto;
    width:auto;
    background:rgba(10,26,47,.74);
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .site-header.is-solid{
    background:rgba(13,32,56,.97);
    border-right:0;
    box-shadow:0 14px 40px rgba(0,0,0,.4);
  }

  .header-rail{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:14px;
    height:auto;
    padding:12px 16px;
  }
  .header-brand{
    flex-direction:row;
    align-items:center;
    gap:10px;
    flex:0 1 auto;
    min-width:0;
  }
  .brand-sub{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    top:100%;left:0;right:0;
    margin:0;
    padding:10px 14px 16px;
    display:none;
    max-height:min(72vh,540px);
    overflow-y:auto;
    background:rgba(10,26,47,.985);
    border-bottom:1px solid rgba(0,229,255,.22);
    box-shadow:0 26px 54px rgba(0,0,0,.5);
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav::after{display:none}
  .nav-link{padding:12px 14px;font-size:1rem}
  .nav-link::before{top:50%}

  .header-actions{
    margin-top:0;
    flex-direction:row;
    align-items:center;
    gap:10px;
    flex:0 0 auto;
  }
  .header-note{display:none}
  .header-cta{padding:8px 11px;font-size:.7rem}
}

@media (max-width:420px){
  .header-cta{display:none}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
  html{scroll-behavior:auto}
  .js [data-reveal]{opacity:1;transform:none;transition:none}
  .scroll-progress{transition:none}
  .btn:hover,.header-cta:hover{transform:none}
}