:root{
  --red:#C81F2B;
  --red-deep:#7A1220;
  --gold:#C9A227;
  --gold-deep:#8A6A12;
  --gold-light:#E8CE7A;
  --ink:#16120F;
  --brown:#2A211C;
  --jade-white:#F7F3EC;
  --paper:#FDFAF4;
  --grid:#D9CFBE;
  --jade:#2F6F63;
  --shell:1200px;
  --pad:clamp(16px,4vw,40px);
  --serif:"Noto Serif SC","Songti SC","Source Han Serif SC",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,monospace;
  --step-0:16px;
  --step--1:14px;
  --step--2:12px;
  --header-h:72px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background-color:var(--jade-white);
  background-image:
    linear-gradient(to right,rgba(217,207,190,.38) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(217,207,190,.38) 1px,transparent 1px);
  background-size:60px 60px;
  color:var(--ink);
  font-family:var(--sans);
  font-size:var(--step-0);
  line-height:1.75;
  font-weight:400;
}
img,svg{max-width:100%;display:block;}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
.mono{font-family:var(--mono);letter-spacing:.08em;font-variant-numeric:tabular-nums;}
:focus-visible{outline:2px solid var(--red);outline-offset:3px;}

.skip-link{
  position:absolute;left:12px;top:-64px;z-index:120;
  background:var(--ink);color:var(--jade-white);
  padding:10px 18px;font-size:var(--step--1);
  border-left:3px solid var(--gold);
  transition:top .2s ease-out;
}
.skip-link:focus{top:12px;}

.site-shell{
  width:100%;max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
}

/* ---------- header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  background:transparent;
  color:var(--jade-white);
  border-bottom:1px solid transparent;
  transition:background-color .25s ease-out,color .25s ease-out,border-color .25s ease-out;
}
.site-header::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(22,18,15,.55),rgba(22,18,15,0));
  pointer-events:none;
  transition:opacity .25s ease-out;
}
.site-header[data-scrolled="true"]{
  background:var(--jade-white);
  color:var(--ink);
  border-bottom:1px solid var(--ink);
}
.site-header[data-scrolled="true"]::before{opacity:0;}
.header-inner{
  position:relative;
  display:flex;align-items:center;gap:24px;
  min-height:var(--header-h);
}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(201,162,39,.28);
  overflow:hidden;
}
.progress-bar{
  display:block;height:100%;width:100%;
  background:var(--red);
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  transition:transform .12s linear;
}

.brand-seal{
  display:flex;align-items:center;gap:12px;
  flex:0 0 auto;
  color:inherit;
}
.brand-seal-text{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--red);color:var(--jade-white);
  font-family:var(--serif);font-weight:900;
  font-size:18px;letter-spacing:.12em;
  padding:8px 10px 8px 12px;
  border-radius:0;
  box-shadow:inset 0 0 0 1px rgba(247,243,236,.45);
  line-height:1;
}
.brand-meta{display:flex;flex-direction:column;line-height:1.3;}
.brand-domain{
  font-family:var(--mono);font-size:var(--step--2);
  letter-spacing:.08em;
}
.brand-sub{
  font-size:11px;letter-spacing:.22em;
  color:var(--gold);
  transition:color .25s ease-out;
}
.site-header[data-scrolled="true"] .brand-sub{color:var(--gold-deep);}

.primary-nav{display:flex;align-items:center;gap:24px;flex:1 1 auto;}
.nav-list{display:flex;align-items:center;gap:32px;}
.nav-item{position:relative;}
.nav-link{
  position:relative;display:inline-block;
  font-size:var(--step--1);line-height:1.4;
  padding:6px 0;
  letter-spacing:.04em;
  transition:color .2s ease-out;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--red);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .2s ease-out;
}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--red);}
.site-header[data-scrolled="true"] .nav-link[aria-current="page"]{color:var(--red);}
.site-header:not([data-scrolled="true"]) .nav-link[aria-current="page"]{color:var(--jade-white);}
.site-header:not([data-scrolled="true"]) .nav-link[aria-current="page"]::after{
  background:var(--gold-light);transform:scaleX(1);
}
.site-header[data-scrolled="true"] .nav-link[aria-current="page"]::after{transform:scaleX(1);}

.header-actions{
  display:flex;flex-direction:column;align-items:flex-end;gap:6px;
  flex:0 0 auto;
}
.header-status{
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  opacity:.85;white-space:nowrap;
}
.nav-actions{display:none;}

/* buttons */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;
  gap:8px;
  padding:10px 22px;
  font-size:var(--step--1);font-weight:500;letter-spacing:.08em;
  border-radius:0;border:1px solid transparent;
  background:transparent;color:var(--ink);
  transition:background-color .2s ease-out,color .2s ease-out,border-color .2s ease-out,transform .2s ease-out;
}
.btn::after{
  content:"";position:absolute;inset:2px;
  border:1px solid rgba(201,162,39,.75);
  pointer-events:none;
}
.btn--primary{background:var(--red);color:var(--jade-white);border-color:var(--red-deep);}
.btn--primary::after{border-color:rgba(232,206,122,.85);}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--red-deep);}
.btn--primary:active{transform:translateY(1px);}
.btn--ghost{background:transparent;color:inherit;border-color:var(--gold-deep);}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--gold-light);color:var(--ink);}
.btn--block{width:100%;}

.nav-toggle{
  display:none;
  margin-left:auto;
  width:44px;height:44px;
  align-items:center;justify-content:center;
  border:1px solid currentColor;
  border-radius:0;
  color:inherit;
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  display:block;width:20px;height:2px;background:currentColor;
  transition:transform .25s ease-out,opacity .2s ease-out;
}
.nav-toggle-bars{position:relative;}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;
}
.nav-toggle-bars::before{top:-6px;}
.nav-toggle-bars::after{top:6px;}
.site-header[data-open="true"] .nav-toggle-bars{background:transparent;}
.site-header[data-open="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg);}

/* ---------- generic components ---------- */
main{display:block;}
.content-shell{
  width:100%;max-width:var(--shell);
  margin-inline:auto;padding-inline:var(--pad);
}
.prose{max-width:42em;}
.prose p+p{margin-top:1em;}
.prose a{color:var(--red);border-bottom:1px solid var(--gold);}
.prose a:hover{color:var(--red-deep);}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:11px;letter-spacing:.22em;font-weight:500;
  color:var(--gold-deep);text-transform:uppercase;
}
.eyebrow::before{
  content:"";width:22px;height:1px;background:var(--gold);
}

.section-rule{
  height:1px;background:var(--gold);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .4s ease-out;
}
.section-rule[data-visible="true"]{transform:scaleX(1);}

.panel{
  background:var(--paper);
  border:1px solid var(--ink);
  border-radius:0;
}
.panel--paper{background:var(--paper);}
.panel--deep{background:var(--brown);color:var(--jade-white);border-color:var(--brown);}
.panel--deep .eyebrow{color:var(--gold-light);}
.panel--deep .eyebrow::before{background:var(--gold-light);}

.tag{
  display:inline-flex;align-items:center;
  padding:2px 8px;
  font-size:11px;letter-spacing:.1em;
  border:1px solid var(--gold-deep);color:var(--gold-deep);
  background:var(--gold-light);
}
.tag--jade{color:var(--jade-white);background:var(--jade);border-color:var(--jade);}
.tag--gold{color:var(--ink);background:var(--gold-light);border-color:var(--gold-deep);}

.ledger{
  border-top:1px solid var(--grid);
  margin:0;
}
.ledger-row{
  display:grid;grid-template-columns:minmax(96px,180px) 1fr;
  gap:16px;align-items:baseline;
  min-height:44px;padding:10px 0;
  border-bottom:1px dashed var(--grid);
}
.ledger-key{
  font-size:var(--step--2);letter-spacing:.14em;
  color:var(--gold-deep);font-weight:500;
}
.ledger-val{
  font-family:var(--mono);font-size:var(--step--1);
  letter-spacing:.04em;
}

.scroll-band{
  position:relative;
  padding-block:clamp(48px,7vw,96px);
}
.scroll-band-head{
  display:flex;align-items:flex-start;gap:20px;
  padding-top:14px;
  border-top:1px solid var(--gold);
  flex-wrap:wrap;
}
.scroll-band-num{
  font-family:var(--mono);
  font-size:clamp(40px,7vw,72px);
  line-height:.9;
  color:var(--gold);
  letter-spacing:-.02em;
}
.scroll-band-label{
  font-size:11px;letter-spacing:.22em;
  color:var(--gold-deep);
  writing-mode:horizontal-tb;
}
.scroll-band-title{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(26px,4vw,44px);
  line-height:1.15;letter-spacing:-.01em;
}

.index-list{display:grid;gap:0;border-top:1px solid var(--ink);}
.index-card{border-bottom:1px solid var(--ink);}
.index-card-head{display:flex;align-items:center;gap:16px;width:100%;padding:16px 0;text-align:left;}
.index-card-head .index-marker{
  font-family:var(--mono);font-size:var(--step--2);
  color:var(--gold-deep);letter-spacing:.08em;flex:0 0 auto;
}
.index-card-title{font-weight:500;font-size:var(--step-0);flex:1 1 auto;}
.index-card-body{
  overflow:hidden;height:0;
  transition:height .32s ease-out;
}
.index-card-body > *{padding-bottom:18px;}
.index-card[data-open="true"] .index-card-title{color:var(--red);}
.fold-icon{
  position:relative;flex:0 0 auto;width:16px;height:16px;
}
.fold-icon::before,.fold-icon::after{
  content:"";position:absolute;background:var(--gold-deep);
  transition:transform .32s ease-out;
}
.fold-icon::before{left:0;right:0;top:7px;height:2px;}
.fold-icon::after{top:0;bottom:0;left:7px;width:2px;}
[data-fold][data-open="true"] .fold-icon::after{transform:rotate(90deg) scaleX(0);}

.copy-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;font-size:var(--step--2);letter-spacing:.1em;
  border:1px solid var(--gold-deep);background:var(--gold-light);color:var(--ink);
  transition:background-color .2s ease-out,color .2s ease-out;
}
.copy-btn:hover{background:var(--gold);}
.copy-btn[data-copied="true"]{background:var(--jade);color:var(--jade-white);border-color:var(--jade);}

.breadcrumb{margin-block:0 0;}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:var(--step--2);letter-spacing:.08em;color:var(--gold-deep);}
.breadcrumb-item+.breadcrumb-item::before{content:"/";margin-right:8px;color:var(--grid);}
.breadcrumb-item a:hover{color:var(--red);}

[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .4s ease-out,transform .4s ease-out;
}
[data-reveal][data-visible="true"]{opacity:1;transform:none;}

.media-frame{
  position:relative;
  background:
    linear-gradient(135deg,rgba(200,31,43,.16),rgba(201,162,39,.22)),
    var(--paper);
  border:1px solid var(--ink);
  overflow:hidden;
}
.media-frame::after{
  content:"";position:absolute;inset:8px;
  border:1px solid rgba(201,162,39,.55);
  pointer-events:none;
}
.media-frame-inner{
  aspect-ratio:16/10;width:100%;
  display:flex;align-items:center;justify-content:center;
  color:var(--gold-deep);font-family:var(--mono);font-size:var(--step--2);
  letter-spacing:.18em;
}
.media-frame-inner img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide .media-frame-inner{aspect-ratio:21/9;}
.media-frame--tall .media-frame-inner{aspect-ratio:4/5;}

.scroll-ruler{
  position:fixed;right:18px;top:50%;transform:translateY(-50%);
  z-index:60;display:flex;flex-direction:column;gap:10px;
}
.ruler-item{
  display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  color:var(--gold-deep);
  transition:color .2s ease-out;
}
.ruler-item::before{
  content:"";width:12px;height:1px;background:currentColor;
  transition:width .2s ease-out;
}
.ruler-item[aria-current="true"]{color:var(--red);}
.ruler-item[aria-current="true"]::before{width:24px;}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,96px);
  background:var(--brown);
  color:var(--jade-white);
  padding-block:clamp(40px,6vw,64px) 0;
  border-top:1px solid var(--gold);
}
.footer-inner{display:grid;gap:clamp(28px,4vw,44px);}
.footer-brand{
  display:grid;gap:14px;
  padding-bottom:clamp(20px,3vw,28px);
  border-bottom:1px solid rgba(201,162,39,.45);
}
.brand-seal--footer .brand-seal-text{box-shadow:inset 0 0 0 1px rgba(232,206,122,.7);}
.footer-line{
  max-width:34em;font-size:var(--step--1);
  color:rgba(247,243,236,.86);
}
.footer-rule{
  display:block;height:1px;width:min(180px,40%);
  background:var(--gold);
}
.footer-columns{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(20px,3vw,36px);
}
.footer-col-title{
  font-family:var(--serif);font-weight:900;
  font-size:var(--step-0);
  color:var(--gold-light);
  letter-spacing:.06em;
  margin-bottom:12px;
}
.footer-list{display:grid;gap:8px;font-size:var(--step--1);}
.footer-list a{
  color:rgba(247,243,236,.88);
  border-bottom:1px solid transparent;
  transition:color .2s ease-out,border-color .2s ease-out;
}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--gold-light);border-bottom-color:var(--gold-light);}
.footer-list--contact{gap:10px;}
.footer-list--contact li{display:grid;gap:2px;font-size:var(--step--2);line-height:1.6;}
.footer-label{
  display:block;font-size:11px;letter-spacing:.18em;
  color:var(--gold);
}
.footer-list--contact .mono{font-size:var(--step--2);letter-spacing:.04em;}
.footer-note{
  margin-top:12px;padding-top:10px;
  border-top:1px dashed rgba(201,162,39,.4);
  font-size:var(--step--2);color:rgba(247,243,236,.72);
}
.footer-base{
  display:flex;flex-wrap:wrap;gap:12px;
  align-items:center;justify-content:space-between;
  padding-block:16px;
  border-top:1px solid var(--ink);
  background:var(--brown);
}
.footer-mono{
  font-size:var(--step--2);letter-spacing:.06em;
  color:rgba(247,243,236,.78);
}
.back-top{
  display:inline-flex;align-items:center;gap:10px;
  font-size:var(--step--2);letter-spacing:.1em;
  color:var(--gold-light);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease-out,color .2s ease-out;
}
.back-top:hover,.back-top:focus-visible{border-bottom-color:var(--gold-light);color:var(--jade-white);}
.back-top-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;border:1px solid var(--gold);
  font-size:11px;
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));}
  .scroll-ruler{display:none;}
}
@media (max-width:900px){
  .nav-list{gap:22px;}
  .header-status{display:none;}
}
@media (max-width:820px){
  :root{--header-h:64px;}
  .site-header{background:var(--jade-white);color:var(--ink);border-bottom:1px solid var(--ink);}
  .site-header::before{opacity:0;}
  .header-actions{display:none;}
  .nav-toggle{display:inline-flex;}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--jade-white);color:var(--ink);
    border-bottom:1px solid var(--ink);
    border-top:1px solid var(--grid);
    padding:12px var(--pad) 20px;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-header[data-open="true"] .primary-nav{display:flex;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-item{border-bottom:1px solid var(--grid);}
  .nav-link{display:block;padding:14px 0;font-size:var(--step-0);}
  .nav-link::after{display:none;}
  .nav-link[aria-current="page"]{color:var(--red);}
  .nav-actions{display:grid;gap:10px;margin-top:16px;}
  .nav-status{display:block;font-size:11px;color:var(--gold-deep);opacity:1;}
  .btn{min-height:44px;}
  .footer-columns{grid-template-columns:1fr;}
  .footer-base{flex-direction:column;align-items:flex-start;}
}
@media (max-width:520px){
  .brand-meta{display:none;}
  .ledger-row{grid-template-columns:1fr;gap:2px;min-height:0;}
  .scroll-band-head{gap:12px;}
}

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