*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:150px;}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;}
a{color:var(--cyan);}

:root{
  --ink:#0C1210;
  --ink-soft:#12251E;
  --ink-deep:#080E0D;
  --cream:#F2EAD9;
  --brown:#2A1F1A;
  --cyan:#2EF2C4;
  --orange:#FF6B35;
  --amber:#FFC24B;
  --blue:#4C7DFF;
  --sage:#7E938A;
  --bone:#D9D3C6;

  --font-display:"Songti SC","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --font-head:"PingFang SC","Noto Sans SC","Microsoft YaHei","Heiti SC",sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei","Heiti SC",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Courier New",monospace;

  --rule:3px solid var(--brown);
  --rule-hair:1px solid rgba(217,211,198,.2);
  --shadow-hard:6px 6px 0 var(--brown);
  --shadow-hard-sm:4px 4px 0 var(--brown);
  --shell:1240px;
  --gutter:20px;
}

body{
  background:var(--ink);
  color:var(--bone);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.02em;
  color:var(--cream);
  text-wrap:balance;
}
h1{font-size:clamp(34px,5.2vw,68px);}
h2{font-size:clamp(26px,3.4vw,44px);}
h3{font-size:clamp(20px,2.2vw,28px);}
p{text-wrap:pretty;}

:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{
  outline:3px solid var(--cyan);
  outline-offset:3px;
}

.shell{
  width:min(var(--shell),100% - (var(--gutter) * 2));
  margin-inline:auto;
}

.skip-link{
  position:absolute;
  left:12px;
  top:-120px;
  z-index:300;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--brown);
  font-family:var(--font-head);
  font-weight:700;
  font-size:14px;
  letter-spacing:.06em;
  text-decoration:none;
  border:3px solid var(--brown);
  box-shadow:var(--shadow-hard-sm);
  transition:top .18s ease;
}
.skip-link:focus{top:12px;}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  border-bottom:var(--rule);
  box-shadow:0 4px 0 rgba(0,0,0,.45);
}

.header-strip{
  background:var(--brown);
  color:var(--bone);
  overflow:hidden;
  min-height:34px;
  transition:min-height .22s ease,opacity .22s ease;
}
.strip-inner{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  padding-block:6px;
  min-height:34px;
  transition:padding .22s ease,min-height .22s ease;
}
.strip-tag{
  background:var(--cyan);
  color:var(--brown);
  font-family:var(--font-head);
  font-weight:700;
  font-size:11px;
  letter-spacing:.16em;
  padding:2px 8px;
}
.strip-line{
  flex:1 1 40px;
  min-width:24px;
  height:2px;
  background-image:repeating-linear-gradient(90deg,var(--sage) 0 6px,transparent 6px 13px);
}
.strip-text{
  font-size:11px;
  letter-spacing:.1em;
  color:var(--bone);
}
.strip-side{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--orange);
}

.masthead{
  position:relative;
  background:var(--ink);
  overflow:hidden;
}
.masthead::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(90deg,rgba(217,211,198,.055) 0 1px,transparent 1px 74px);
  pointer-events:none;
}
.masthead-inner{
  position:relative;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:18px;
  padding-block:16px 14px;
  transition:padding .22s ease;
}
.masthead-kicker{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--sage);
  display:flex;
  flex-direction:column;
  gap:2px;
}
.masthead-kicker em{
  font-style:normal;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:var(--orange);
}
.masthead-note{
  justify-self:end;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--bone);
  border-bottom:3px solid var(--orange);
  padding-bottom:3px;
  white-space:nowrap;
}

.brand{
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:4px;
  justify-self:center;
  text-align:center;
  text-decoration:none;
  color:var(--cream);
}
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(26px,3.4vw,40px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cream);
  transition:font-size .22s ease;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--sage);
}
.brand-mark{
  display:none;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:14px;
  letter-spacing:.08em;
  color:var(--cyan);
  border:2px solid var(--cyan);
  padding:2px 6px;
  line-height:1.2;
}

.site-header[data-scrolled="true"] .header-strip{
  min-height:0;
  opacity:0;
  pointer-events:none;
}
.site-header[data-scrolled="true"] .strip-inner{
  padding-block:0;
  min-height:0;
}
.site-header[data-scrolled="true"] .masthead-inner{
  padding-block:8px;
  grid-template-columns:auto 1fr auto;
  justify-items:start;
}
.site-header[data-scrolled="true"] .brand{
  flex-direction:row;
  align-items:center;
  gap:10px;
  justify-self:start;
}
.site-header[data-scrolled="true"] .brand-mark{display:inline-block;}
.site-header[data-scrolled="true"] .brand-name{font-size:22px;}
.site-header[data-scrolled="true"] .brand-sub,
.site-header[data-scrolled="true"] .masthead-kicker{display:none;}

.nav-toggle{
  display:none;
  position:absolute;
  right:max(16px,calc((100% - var(--shell)) / 2));
  top:50%;
  transform:translateY(-50%);
  align-items:center;
  gap:8px;
  padding:9px 12px;
  background:var(--ink-soft);
  color:var(--cream);
  border:2px solid var(--bone);
  cursor:pointer;
  font-family:var(--font-head);
  font-weight:700;
  font-size:12px;
  letter-spacing:.14em;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.nav-toggle[aria-expanded="true"]{
  background:var(--cyan);
  color:var(--brown);
  border-color:var(--brown);
}
.nav-toggle-bars{
  display:inline-flex;
  flex-direction:column;
  gap:3px;
  width:16px;
}
.nav-toggle-bars i{
  display:block;
  height:2px;
  width:100%;
  background:currentColor;
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(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(-5px) rotate(-45deg);}
.nav-toggle-label{white-space:nowrap;}

.primary-nav{
  background:var(--ink-soft);
  border-top:var(--rule-hair);
}
.nav-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px;
}
.nav-list{
  grid-column:2;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
}
.nav-item{display:block;}
.nav-link{
  position:relative;
  display:block;
  padding:15px 14px;
  color:var(--bone);
  font-size:14px;
  font-weight:500;
  letter-spacing:.05em;
  text-decoration:none;
  white-space:nowrap;
  transition:color .16s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:8px;
  height:3px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s ease;
}
.nav-link:hover{color:var(--cyan);}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--cyan);}
.nav-link[aria-current="page"]::after{transform:scaleX(1);}
.nav-actions{
  grid-column:3;
  justify-self:end;
  display:flex;
  gap:8px;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:3px solid var(--brown);
  font-family:var(--font-head);
  font-weight:900;
  font-size:14px;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background-color .15s ease,color .15s ease;
}
.btn--sm{padding:8px 14px;font-size:13px;border-width:2px;}
.btn--solid{
  background:var(--cyan);
  color:var(--brown);
  box-shadow:var(--shadow-hard-sm);
}
.btn--solid:hover{
  background:#63f8d5;
  transform:translate(-1px,-1px);
  box-shadow:6px 6px 0 var(--brown);
}
.btn--ghost{
  background:transparent;
  color:var(--cream);
  border-color:var(--cyan);
  box-shadow:4px 4px 0 rgba(46,242,196,.28);
}
.btn--ghost:hover{
  background:rgba(46,242,196,.12);
  color:var(--cyan);
  transform:translate(-1px,-1px);
}
.btn--orange{
  background:var(--orange);
  color:var(--brown);
  box-shadow:var(--shadow-hard-sm);
}
.btn--orange:hover{
  background:#ff8557;
  transform:translate(-1px,-1px);
  box-shadow:6px 6px 0 var(--brown);
}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--brown);}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:64px;
  background:var(--ink-soft);
  color:var(--bone);
  border-top:3px solid var(--brown);
}
.site-footer::before{
  content:"";
  display:block;
  height:8px;
  background-image:repeating-linear-gradient(90deg,var(--cyan) 0 26px,var(--orange) 26px 52px,var(--amber) 52px 78px,var(--blue) 78px 104px);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(260px,1fr) minmax(0,2fr);
  gap:44px;
  padding-block:52px 40px;
}
.footer-brand{display:flex;flex-direction:column;gap:16px;}
.brand--footer{
  align-items:flex-start;
  justify-self:start;
  text-align:left;
  gap:6px;
}
.brand--footer .brand-name{font-size:clamp(24px,2.6vw,32px);}
.brand--footer .brand-sub{color:var(--sage);}
.footer-claim{
  max-width:32ch;
  font-size:14px;
  line-height:1.75;
  color:var(--bone);
}
.footer-stamp{
  align-self:flex-start;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--cyan);
  border:2px solid rgba(46,242,196,.4);
  padding:5px 10px;
}
.footer-sitemap{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.sitemap-col{min-width:0;}
.sitemap-title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--orange);
  margin-bottom:14px;
  padding-bottom:8px;
  border-bottom:1px solid rgba(217,211,198,.18);
}
.sitemap-list{display:flex;flex-direction:column;gap:2px;}
.sitemap-link{
  display:inline-block;
  padding:5px 0;
  color:var(--cream);
  font-size:15px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.sitemap-link:hover{color:var(--cyan);border-bottom-color:var(--cyan);}

.footer-band{
  background:var(--brown);
  border-top:1px solid rgba(217,211,198,.15);
  border-bottom:1px solid rgba(217,211,198,.15);
}
.footer-band-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px 24px;
  flex-wrap:wrap;
  padding-block:15px;
}
.legal-links{display:flex;flex-wrap:wrap;gap:20px;}
.legal-links a{
  color:var(--bone);
  font-size:12px;
  letter-spacing:.08em;
  text-decoration:none;
  border-bottom:1px dashed rgba(217,211,198,.45);
  transition:color .16s ease,border-color .16s ease;
}
.legal-links a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.footer-year{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--sage);
}

.footer-base{background:var(--ink);}
.footer-base-inner{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 28px;
  padding-block:18px 22px;
}
.footer-contact,.footer-address,.footer-icp{
  font-size:12px;
  letter-spacing:.04em;
  color:var(--sage);
}
.footer-icp{font-family:var(--font-mono);letter-spacing:.08em;}

/* ---------- shared page primitives ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  padding-block:16px 6px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--sage);
}
.breadcrumbs li{display:flex;align-items:center;gap:6px;}
.breadcrumbs li+li::before{content:"/";color:var(--sage);}
.breadcrumbs a{
  color:var(--bone);
  text-decoration:none;
  border-bottom:1px solid rgba(217,211,198,.35);
}
.breadcrumbs a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}

.section-head{margin-bottom:28px;}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:24px;
  height:3px;
  background:var(--cyan);
}

.prose{max-width:38em;font-size:16px;line-height:1.7;color:var(--bone);}
.prose>*+*{margin-top:1em;}
.prose h2,.prose h3{margin-top:1.8em;color:var(--cream);}
.prose a{color:var(--cyan);text-decoration:none;border-bottom:2px solid rgba(46,242,196,.45);}
.prose a:hover{border-bottom-color:var(--cyan);}
.prose ul,.prose ol{padding-left:1.3em;list-style:disc;}
.prose ol{list-style:decimal;}
.prose li+li{margin-top:.4em;}
.prose strong{color:var(--cream);}
.prose code{
  font-family:var(--font-mono);
  font-size:.92em;
  background:rgba(46,242,196,.1);
  color:var(--cyan);
  padding:1px 5px;
}

.stack>*+*{margin-top:16px;}

.grid{display:grid;gap:20px;}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:3px solid var(--brown);
  background:var(--ink-deep);
  box-shadow:var(--shadow-hard);
  margin:0;
}
.media-frame img,
.media-frame picture,
.media-frame video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame[data-ratio="16x9"]{aspect-ratio:16 / 9;}
.media-frame[data-ratio="4x3"]{aspect-ratio:4 / 3;}
.media-frame[data-ratio="1x1"]{aspect-ratio:1 / 1;}
.media-frame[data-ratio="3x4"]{aspect-ratio:3 / 4;}
.media-frame figcaption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:8px 12px;
  background:linear-gradient(180deg,rgba(8,14,13,0),rgba(8,14,13,.86));
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--bone);
}

/* ---------- motion ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(24px) rotate(var(--reveal-tilt,0deg));
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.3,1);
}
.js [data-reveal][data-revealed="true"]{
  opacity:1;
  transform:translateY(0) rotate(0deg);
}

[data-toc-link][aria-current="true"]{color:var(--cyan);}

.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:90;
  width:56px;
  height:56px;
  display:grid;
  place-items:center;
  border:3px solid var(--brown);
  background:var(--ink-soft);
  color:var(--cyan);
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transform:translateY(16px);
  transition:opacity .24s ease,transform .24s ease,background-color .16s ease;
}
.to-top[data-visible="true"]{
  opacity:1;
  pointer-events:auto;
  transform:translateY(0);
}
.to-top:hover{background:var(--ink);}
.to-top::before{
  content:"";
  position:absolute;
  inset:-7px;
  border-radius:50%;
  background:conic-gradient(from -90deg,var(--cyan) calc(var(--progress,0) * 1%),rgba(217,211,198,.16) 0);
  -webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 3px),#000 0);
  mask:radial-gradient(farthest-side,transparent calc(100% - 3px),#000 0);
  pointer-events:none;
}
.to-top-arrow{
  width:0;
  height:0;
  border-left:7px solid transparent;
  border-right:7px solid transparent;
  border-bottom:10px solid currentColor;
  margin-top:-4px;
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .nav-link{padding:14px 10px;font-size:13px;}
  .footer-top{gap:32px;}
}

@media (max-width:960px){
  :root{--gutter:16px;}
  html{scroll-padding-top:110px;}
  .site-header[data-scrolled="true"] .masthead-inner{
    grid-template-columns:1fr;
    justify-items:center;
  }
  .masthead-inner{
    grid-template-columns:1fr;
    justify-items:center;
    padding-block:14px;
  }
  .masthead-kicker,.masthead-note{display:none;}
  .strip-side{display:none;}
  .nav-toggle{display:inline-flex;}
  .primary-nav{display:none;border-top:2px solid rgba(42,31,26,.9);}
  .primary-nav[data-open]{display:block;}
  .nav-inner{display:block;padding-block:6px 10px;}
  .nav-list{display:flex;flex-direction:column;align-items:stretch;}
  .nav-link{
    padding:13px 6px;
    font-size:15px;
    border-bottom:1px solid rgba(217,211,198,.14);
  }
  .nav-link::after{left:6px;right:auto;bottom:6px;width:26px;}
  .nav-actions{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:8px;
    margin-top:12px;
    padding:0;
  }
  .footer-top{grid-template-columns:1fr;gap:30px;padding-block:40px 32px;}
  .footer-sitemap{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;}
}

@media (max-width:640px){
  body{font-size:15px;}
  .strip-text{font-size:10px;letter-spacing:.06em;}
  .strip-line{display:none;}
  .footer-sitemap{grid-template-columns:1fr 1fr;gap:20px 16px;}
  .footer-base-inner{flex-direction:column;gap:8px;}
  .footer-band-inner{flex-direction:column;align-items:flex-start;}
  .legal-links{gap:14px;}
  .to-top{right:14px;bottom:14px;width:50px;height:50px;}
  .brand-name{font-size:26px;}
}

@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 [data-reveal]{opacity:1;transform:none;}
  .to-top{transition:none;}
}