:root{
  --abyss-900:#050D18;
  --deep-sea-800:#081A2C;
  --blueprint-700:#102B44;
  --steel-line-500:#2E4B63;
  --mist-100:#DCE8F4;
  --muted-300:#8DA6B8;
  --neon-orange:#FF6B2C;
  --fluoro-cyan:#42F5D4;
  --warm-gold:#E8B45E;

  --rail-w:112px;
  --topbar-h:64px;
  --gutter:clamp(18px,4vw,58px);
  --maxw:1240px;

  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Sarasa Mono SC",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.2,.6,.25,1);
}

*,*::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,dl,dd,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
::selection{background:var(--neon-orange);color:#0A0500;}

html,body{min-height:100%;}

body{
  background-color:var(--abyss-900);
  background-image:
    linear-gradient(to right,rgba(46,75,99,.16) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(46,75,99,.10) 1px,transparent 1px);
  background-size:88px 88px,88px 88px;
  background-attachment:fixed;
  color:var(--mist-100);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
}

:focus-visible{
  outline:2px solid var(--fluoro-cyan);
  outline-offset:3px;
  border-radius:1px;
}

[id]{scroll-margin-top:24px;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:10px 18px;
  background:var(--fluoro-cyan);
  color:var(--abyss-900);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);outline-offset:2px;}

/* ---------- header / side rail ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  z-index:50;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  align-items:center;
  gap:18px;
  padding:22px 0 24px;
  background:var(--deep-sea-800);
  border-right:1px solid var(--steel-line-500);
  box-shadow:12px 0 32px -28px rgba(0,0,0,.9);
}

.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:0 8px;
  text-align:center;
}

.brand__seal{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border:1px solid var(--warm-gold);
  color:var(--warm-gold);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  line-height:1;
  letter-spacing:0;
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.brand:hover .brand__seal,
.brand:focus-visible .brand__seal{
  background:var(--warm-gold);
  color:var(--abyss-900);
}

.brand__name{
  writing-mode:vertical-rl;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  line-height:1.22;
  letter-spacing:.26em;
  color:var(--mist-100);
}

.brand__tag{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:9.5px;
  line-height:1.35;
  letter-spacing:.2em;
  color:var(--steel-line-500);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  border:1px solid var(--steel-line-500);
  color:var(--mist-100);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--fluoro-cyan);color:var(--fluoro-cyan);}
.nav-toggle__bars{display:grid;gap:5px;width:16px;}
.nav-toggle__bars span{display:block;height:1px;width:100%;background:currentColor;transition:transform .2s 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);}
.nav-toggle__label{line-height:1;}

.site-nav{
  display:flex;
  flex-direction:column;
  gap:16px;
  width:100%;
  padding:0 8px;
}

.site-nav__list{display:flex;flex-direction:column;gap:2px;width:100%;}

.site-nav__item{width:100%;}

.site-nav__link{
  display:grid;
  gap:1px;
  width:100%;
  padding:9px 10px;
  border-left:2px solid transparent;
  color:var(--muted-300);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.site-nav__link:hover{
  border-left-color:var(--steel-line-500);
  background:rgba(66,245,212,.05);
  color:var(--mist-100);
}
.site-nav__index{
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1.4;
  letter-spacing:.16em;
  color:var(--steel-line-500);
  transition:color .16s var(--ease);
}
.site-nav__label{
  font-size:12.5px;
  line-height:1.35;
  letter-spacing:.02em;
}

.site-nav__link[aria-current="page"]{
  border-left-color:var(--fluoro-cyan);
  background:rgba(66,245,212,.08);
}
.site-nav__link[aria-current="page"] .site-nav__label{color:var(--mist-100);font-weight:600;}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--fluoro-cyan);}

.rail-utils{
  display:grid;
  gap:7px;
  width:100%;
  padding:14px 10px 0;
  border-top:1px solid var(--steel-line-500);
}
.rail-util{
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.5;
  letter-spacing:.08em;
  color:var(--muted-300);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.rail-util:hover{color:var(--fluoro-cyan);border-bottom-color:var(--fluoro-cyan);}

/* ---------- scroll meter ---------- */
.scroll-meter{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  z-index:70;
  pointer-events:none;
  background:rgba(46,75,99,.45);
}
.scroll-meter__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:var(--fluoro-cyan);
  will-change:transform;
}

/* ---------- shared layout utilities ---------- */
.wrap{
  width:100%;
  max-width:calc(var(--maxw) + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.grid-blueprint{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.2vw,30px);
}

.rule{
  height:1px;
  border:0;
  margin:clamp(24px,4vw,48px) 0;
  background:var(--steel-line-500);
}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 18px;
  margin-bottom:clamp(18px,2.6vw,32px);
  padding-bottom:12px;
  border-bottom:1px solid var(--steel-line-500);
}
.section-head__index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--fluoro-cyan);
}
.section-head__title{
  font-family:var(--font-display);
  font-size:clamp(1.25rem,2.4vw,1.9rem);
  font-weight:800;
  line-height:1.28;
  letter-spacing:-.02em;
  color:var(--mist-100);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--warm-gold);
}

.mono-note{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  letter-spacing:.1em;
  color:var(--muted-300);
}

.vlabel{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.18em;
  color:var(--muted-300);
}

/* ---------- buttons / tags / chips ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid var(--steel-line-500);
  background:transparent;
  color:var(--mist-100);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.2;
  letter-spacing:.12em;
  transition:border-color .16s var(--ease),background-color .16s var(--ease),color .16s var(--ease);
}
.btn:hover{border-color:var(--fluoro-cyan);color:var(--fluoro-cyan);}

.btn--primary{
  background:var(--neon-orange);
  border-color:var(--neon-orange);
  color:#100600;
  font-weight:700;
}
.btn--primary:hover{
  background:#FF8850;
  border-color:#FF8850;
  color:#100600;
}

.btn--ghost{
  border-color:var(--steel-line-500);
  color:var(--fluoro-cyan);
}
.btn--ghost:hover{
  border-color:var(--fluoro-cyan);
  background:rgba(66,245,212,.09);
}

.tag{
  display:inline-block;
  padding:3px 9px;
  border:1px solid var(--steel-line-500);
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.5;
  letter-spacing:.14em;
  color:var(--muted-300);
}
.tag--hot{border-color:var(--neon-orange);color:var(--neon-orange);}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 13px;
  border:1px solid var(--steel-line-500);
  background:transparent;
  color:var(--muted-300);
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.3;
  letter-spacing:.1em;
  transition:border-color .14s var(--ease),background-color .14s var(--ease),color .14s var(--ease);
}
.chip:hover{border-color:var(--fluoro-cyan);color:var(--fluoro-cyan);}
.chip[aria-pressed="true"],
.chip.is-active{
  background:rgba(66,245,212,.14);
  border-color:var(--fluoro-cyan);
  color:var(--fluoro-cyan);
}

/* ---------- cards / stacking paper ---------- */
.stack{
  position:relative;
  isolation:isolate;
}
.stack::before{
  content:"";
  position:absolute;
  inset:0;
  transform:translate(5px,5px);
  background:var(--blueprint-700);
  border:1px solid var(--steel-line-500);
  z-index:-1;
}

.card{
  position:relative;
  background:var(--blueprint-700);
  border:1px solid var(--steel-line-500);
  padding:clamp(18px,2.4vw,30px);
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.card:hover{border-color:var(--fluoro-cyan);}
.card__title{
  font-family:var(--font-display);
  font-size:clamp(1.02rem,1.7vw,1.35rem);
  font-weight:700;
  line-height:1.32;
  letter-spacing:-.01em;
  color:var(--mist-100);
}
.card__text{
  margin-top:8px;
  font-size:14.5px;
  line-height:1.82;
  color:var(--muted-300);
}

/* ---------- media container for page stage ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--steel-line-500);
  background:
    linear-gradient(155deg,var(--blueprint-700) 0%,var(--abyss-900) 78%);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  border:1px solid transparent;
  pointer-events:none;
  transition:border-color .18s var(--ease);
}
.media-frame:hover::after{border-color:rgba(66,245,212,.55);}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame__label{
  position:absolute;
  left:10px;
  bottom:9px;
  z-index:1;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--muted-300);
}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.6;
  letter-spacing:.14em;
  color:var(--muted-300);
}
.breadcrumb__link{color:var(--muted-300);transition:color .16s var(--ease);}
.breadcrumb__link:hover{color:var(--fluoro-cyan);}

/* ---------- prose ---------- */
.prose{
  max-width:74ch;
  font-size:16.5px;
  line-height:1.9;
  color:var(--muted-300);
}
.prose h2{
  margin-top:2em;
  font-family:var(--font-display);
  font-size:clamp(1.15rem,2vw,1.5rem);
  font-weight:700;
  line-height:1.35;
  letter-spacing:-.01em;
  color:var(--mist-100);
}
.prose h3{
  margin-top:1.6em;
  font-family:var(--font-display);
  font-size:1.05rem;
  font-weight:700;
  color:var(--mist-100);
}
.prose p + p{margin-top:1.05em;}
.prose a{
  color:var(--fluoro-cyan);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.prose ul{margin-top:1em;display:grid;gap:9px;}
.prose li{position:relative;padding-left:20px;}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.85em;
  width:9px;
  height:1px;
  background:var(--steel-line-500);
}

/* ---------- reveal ---------- */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js-ready [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,120px);
  padding:clamp(36px,5.5vw,72px) var(--gutter) clamp(20px,3vw,30px);
  background:var(--deep-sea-800);
  border-top:1px solid var(--steel-line-500);
  color:var(--muted-300);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:var(--gutter);
  width:96px;
  height:2px;
  background:var(--warm-gold);
}

.footer-inner{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(24px,3.5vw,44px);
  max-width:var(--maxw);
  margin-inline:auto;
}

.footer-brand__mark{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-display);
  font-size:16px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--mist-100);
}
.footer-brand__seal{
  display:grid;
  place-items:center;
  width:26px;
  height:26px;
  border:1px solid var(--warm-gold);
  color:var(--warm-gold);
  font-size:12px;
  font-weight:700;
  line-height:1;
  letter-spacing:0;
}
.footer-brand__blurb{
  margin-top:14px;
  max-width:40ch;
  font-size:13.5px;
  line-height:1.85;
  color:var(--muted-300);
}
.footer-brand__coord{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.18em;
  color:var(--steel-line-500);
}

.footer-nav__title{
  margin-bottom:14px;
  padding-bottom:8px;
  border-bottom:1px solid var(--steel-line-500);
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:400;
  line-height:1.6;
  letter-spacing:.22em;
  color:var(--warm-gold);
}
.footer-nav__list{display:grid;gap:9px;}
.footer-nav__link{
  font-size:13.5px;
  line-height:1.65;
  color:var(--muted-300);
  transition:color .16s var(--ease);
}
.footer-nav__link:hover{color:var(--fluoro-cyan);}

.footer-contact__item{
  display:grid;
  gap:2px;
  font-size:13.5px;
  line-height:1.7;
}
.footer-contact__k{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--steel-line-500);
}
.footer-contact__v{color:var(--mist-100);word-break:break-word;}

.footer-note{
  max-width:var(--maxw);
  margin:clamp(28px,4vw,44px) auto 0;
  padding-top:16px;
  border-top:1px solid rgba(46,75,99,.6);
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.9;
  letter-spacing:.06em;
  color:var(--steel-line-500);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  max-width:var(--maxw);
  margin:16px auto 0;
}
.footer-base__copy,
.footer-base__icp{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.7;
  letter-spacing:.1em;
  color:var(--muted-300);
}

/* ---------- breakpoints ---------- */
@media (min-width:920px){
  body{padding-left:var(--rail-w);}
  .scroll-meter{left:var(--rail-w);right:0;}
}

@media (min-width:640px){
  .footer-inner{grid-template-columns:1fr 1fr;}
}

@media (min-width:960px){
  .footer-inner{grid-template-columns:1.7fr .8fr 1.3fr .8fr;}
}

@media (max-width:919px){
  body{padding-top:var(--topbar-h);}

  .site-header{
    top:0;
    right:0;
    bottom:auto;
    left:0;
    width:auto;
    height:var(--topbar-h);
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:14px;
    padding:0 16px;
    border-right:0;
    border-bottom:1px solid var(--steel-line-500);
    box-shadow:0 14px 26px -24px rgba(0,0,0,.95);
  }

  .brand{
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:0;
    text-align:left;
  }
  .brand__seal{width:30px;height:30px;font-size:13px;}
  .brand__name{
    writing-mode:horizontal-tb;
    font-size:14.5px;
    letter-spacing:.14em;
  }
  .brand__tag{display:none;}

  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    left:auto;
    z-index:60;
    width:min(86vw,344px);
    padding:calc(var(--topbar-h) + 18px) 20px 28px;
    gap:22px;
    background:var(--deep-sea-800);
    border-left:1px solid var(--steel-line-500);
    overflow-y:auto;
    overscroll-behavior:contain;
    transform:translateX(103%);
    visibility:hidden;
    transition:transform .3s var(--ease),visibility .3s var(--ease);
  }
  .site-nav[data-open]{
    transform:translateX(0);
    visibility:visible;
  }

  body.nav-open{overflow:hidden;}
  body.nav-open::after{
    content:"";
    position:fixed;
    inset:0;
    z-index:55;
    background:rgba(5,13,24,.74);
  }

  .site-nav__link{
    grid-template-columns:auto 1fr;
    align-items:baseline;
    gap:14px;
    padding:14px 4px;
    border-left:0;
    border-bottom:1px solid rgba(46,75,99,.55);
  }
  .site-nav__index{font-size:11px;letter-spacing:.2em;}
  .site-nav__label{font-size:17px;letter-spacing:.04em;}
  .site-nav__link:hover{border-left:0;background:transparent;}
  .site-nav__link[aria-current="page"]{
    border-left:0;
    border-bottom-color:var(--fluoro-cyan);
    background:rgba(66,245,212,.07);
  }
  .site-nav__link[aria-current="page"] .site-nav__label{color:var(--fluoro-cyan);}

  .rail-utils{padding:16px 4px 0;gap:12px;}
  .rail-util{font-size:12px;letter-spacing:.1em;}
}

@media (max-width:520px){
  .footer-base{flex-direction:column;align-items:flex-start;}
  .footer-note{font-size:10.5px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-ready [data-reveal]{opacity:1;transform:none;}
}