/* ===== reset ===== */
*,*::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,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
table{border-collapse:collapse;width:100%}

/* ===== tokens ===== */
:root{
  --ink:#07211C;
  --panel:#0E3A32;
  --line:#1E5A4E;
  --gold:#C9A227;
  --gold-soft:#E7CE86;
  --ice:#7FD3E8;
  --ice-soft:#BFEAF4;
  --paper:#F4F1E8;
  --stone:#93A8A1;
  --stone-paper:#3F5B54;
  --deep:#04100D;
  --paper-ink:#14261F;
  --wrap:1248px;
  --head-h:76px;
  --head-h-sm:58px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Cascadia Mono",Menlo,Consolas,monospace;
}

/* ===== base ===== */
html,body{background:var(--ink)}
body{
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:0;
  min-height:100%;
}
h1,h2,h3,h4,h5{font-weight:800;letter-spacing:-.01em;line-height:1.25;color:var(--paper)}
h1{font-size:40px}
h2{font-size:32px}
h3{font-size:26px}
h4{font-size:21px;font-weight:700}
h5{font-size:18px;font-weight:700}
strong,b{font-weight:700}
p{max-width:74ch}
:focus{outline:none}
:focus-visible{outline:2px solid var(--ice);outline-offset:2px}
::selection{background:var(--gold);color:var(--deep)}

#main-content{display:block;scroll-margin-top:calc(var(--head-h-sm) + 16px)}

/* ===== layout helpers ===== */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.grid{display:grid;gap:32px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split-5-7{grid-template-columns:5fr 7fr}
.split-4-8{grid-template-columns:4fr 8fr}
.split-3-9{grid-template-columns:3fr 9fr}
.hr-rule{height:1px;border:0;background:var(--line);margin:32px 0}

/* ===== type utilities ===== */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:600;color:var(--ice)}
.num-id{font-family:var(--font-mono);font-variant-numeric:tabular-nums;display:inline-block;min-width:7ch;letter-spacing:.02em}
.note{font-size:13px;line-height:1.65;color:var(--stone)}
.lede{font-size:18px;line-height:1.7;color:#D6E4DF;max-width:62ch}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--gold-soft)}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--gold);flex:0 0 auto}

/* ===== skip link ===== */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:120;
  padding:10px 18px;background:var(--gold);color:var(--deep);
  font-size:14px;font-weight:700;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ===== header ===== */
.site-head{
  position:sticky;top:0;z-index:80;
  background:rgba(7,33,28,.42);
  -webkit-backdrop-filter:blur(10px) saturate(1.15);
  backdrop-filter:blur(10px) saturate(1.15);
  border-bottom:1px solid rgba(30,90,78,.55);
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-head[data-scrolled="true"]{
  background:var(--ink);
  border-bottom-color:rgba(201,162,39,.5);
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
}
.head-inner{
  max-width:var(--wrap);margin:0 auto;padding:0 24px;
  min-height:var(--head-h);
  display:flex;align-items:center;gap:24px;
  transition:min-height .2s var(--ease);
}
.site-head[data-scrolled="true"] .head-inner{min-height:var(--head-h-sm)}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--paper)}
.brand-tick{
  position:relative;width:16px;height:24px;
  border-left:2px solid var(--gold);flex:0 0 auto;
}
.brand-tick::before,.brand-tick::after{
  content:"";position:absolute;left:0;width:10px;height:2px;background:var(--gold);
}
.brand-tick::before{top:4px}
.brand-tick::after{bottom:4px}
.brand-name{font-size:17px;font-weight:800;letter-spacing:-.01em;white-space:nowrap;transition:color .18s var(--ease)}
.brand:hover .brand-name{color:var(--gold-soft)}
.brand-sub{
  font-family:var(--font-mono);font-size:11px;line-height:1;color:var(--stone);
  border-left:1px solid var(--line);padding-left:10px;white-space:nowrap;
}

.nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;counter-reset:navi}
.nav-list>li{counter-increment:navi}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:10px 11px;border-radius:2px;
  font-size:15px;font-weight:600;color:var(--paper);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-link::before{
  content:counter(navi,decimal-leading-zero);
  font-family:var(--font-mono);font-size:10px;font-weight:500;color:var(--stone);
  transition:color .18s var(--ease);
}
.nav-link:hover{color:var(--gold-soft);background:rgba(231,206,134,.08)}
.nav-link:hover::before{color:var(--gold)}
.nav-link[aria-current="page"]{color:var(--gold-soft)}
.nav-link[aria-current="page"]::before{color:var(--gold)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:11px;right:11px;bottom:3px;height:2px;background:var(--gold);
}

.head-side{display:flex;align-items:center;gap:14px;flex:0 0 auto}
.head-cta{
  display:inline-flex;align-items:center;height:34px;padding:0 14px;
  border:1px solid rgba(201,162,39,.55);color:var(--gold-soft);
  font-size:13px;font-weight:700;white-space:nowrap;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.head-cta:hover{background:var(--gold);border-color:var(--gold);color:var(--deep)}
.head-status{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:11px;line-height:1;color:var(--stone);white-space:nowrap;
}
.status-dot{display:block;width:6px;height:6px;background:var(--ice);flex:0 0 auto}

.nav-toggle{
  display:none;width:42px;height:34px;
  border:1px solid rgba(30,90,78,.95);
  align-items:center;justify-content:center;flex-direction:column;gap:4px;
  cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);background:rgba(201,162,39,.1)}
.nav-toggle-bar{display:block;width:16px;height:2px;background:var(--paper);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.head-rule{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(30,90,78,.45);overflow:hidden}
.head-progress{display:block;width:0;height:100%;background:var(--gold)}

/* ===== footer ===== */
.site-foot{background:var(--deep);color:var(--paper);border-top:1px solid rgba(201,162,39,.45)}
.foot-grid{
  max-width:var(--wrap);margin:0 auto;padding:56px 24px 40px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px 32px;
  border-bottom:1px solid rgba(30,90,78,.85);
}
.foot-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.foot-brand-link{color:var(--paper)}
.foot-tagline{font-size:15px;line-height:1.7;color:#C3D5CE;max-width:34ch}
.foot-stamp{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;line-height:1.4;color:var(--stone);
  border:1px solid rgba(30,90,78,.9);padding:6px 10px;
}
.foot-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.foot-col-title{
  font-size:13px;font-weight:700;letter-spacing:0;
  color:var(--gold);padding-bottom:10px;border-bottom:1px solid rgba(30,90,78,.9);
}
.foot-list{display:flex;flex-direction:column;gap:10px;font-size:14.5px}
.foot-link{color:#CFE0DA;transition:color .18s var(--ease),padding-left .18s var(--ease)}
.foot-link:hover{color:var(--gold-soft);padding-left:4px}
.foot-contact .foot-item{display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline}
.foot-key{font-family:var(--font-mono);font-size:11px;color:var(--stone);min-width:34px}
.foot-val{color:#DCE9E4;font-size:14px;word-break:break-word}
.foot-note{font-size:12.5px;line-height:1.65;color:var(--stone);max-width:30ch}
.foot-base{
  max-width:var(--wrap);margin:0 auto;padding:18px 24px 34px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;
  font-family:var(--font-mono);font-size:12px;line-height:1.6;color:var(--stone);
}
.foot-icp{font-size:12px;color:#B9C9C3}
.foot-hint{font-size:12px;max-width:none}
.foot-base .foot-stamp{border:0;padding:0;font-size:12px}

/* ===== breadcrumb ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:16px 0;font-family:var(--font-mono);font-size:12px;color:var(--stone)}
.crumb-link{color:var(--stone);transition:color .18s var(--ease)}
.crumb-link:hover{color:var(--gold-soft)}
.crumb-sep{color:var(--line)}
.crumb-now{color:var(--ice)}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 22px;border:1px solid transparent;border-radius:2px;
  font-size:15px;font-weight:700;letter-spacing:0;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn-primary{background:var(--gold);color:var(--deep);border-color:var(--gold)}
.btn-primary:hover{background:var(--gold-soft);border-color:var(--gold-soft)}
.btn-ghost{background:transparent;color:var(--gold-soft);border-color:rgba(201,162,39,.55)}
.btn-ghost:hover{background:rgba(201,162,39,.14);border-color:var(--gold)}

/* ===== surfaces ===== */
.paper{background:var(--paper);color:var(--paper-ink);border-top:1px solid rgba(30,90,78,.6);border-bottom:1px solid rgba(30,90,78,.6)}
.paper h1,.paper h2,.paper h3,.paper h4,.paper h5{color:#0B231D}
.paper .lede{color:#2C443D}
.paper .note,.paper .media-cap{color:var(--stone-paper)}
.paper .eyebrow{color:#7A5F0D}
.paper .eyebrow::before{background:#A8841B}
.paper .num{color:#0F6C85}
.paper .hr-rule{background:#CFC8B6}
.paper .crumb-link,.paper .breadcrumb{color:var(--stone-paper)}
.paper .crumb-now{color:#0F6C85}
.band{
  background-color:var(--panel);
  background-image:repeating-linear-gradient(90deg,rgba(127,211,232,.06) 0 1px,transparent 1px 72px);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:48px 0;
}

/* ===== index strip / tags ===== */
.index-strip{
  display:flex;align-items:center;gap:14px;
  padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--gold);
  background:rgba(14,58,50,.55);color:var(--paper);
  transition:transform .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.index-strip:hover{transform:translateY(-2px);border-color:var(--gold);background:rgba(14,58,50,.85)}
.index-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:13px;color:var(--ice);flex:0 0 auto}
.index-title{font-weight:700;font-size:15px}
.stamp-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;font-size:12px;font-weight:700;line-height:1.5;
  color:var(--gold-soft);border:1px solid rgba(201,162,39,.5);background:rgba(201,162,39,.08);
}

/* ===== table ===== */
.table-basic{font-size:15px}
.table-basic th{
  text-align:left;font-size:12px;font-weight:700;color:var(--stone);
  padding:10px 12px;border-bottom:1px solid var(--line);white-space:nowrap;
}
.table-basic td{
  padding:12px;border-bottom:1px solid rgba(30,90,78,.6);
  font-variant-numeric:tabular-nums;
}
.table-basic tbody tr{transition:background-color .14s var(--ease)}
.table-basic tbody tr:hover{background:rgba(30,90,78,.38)}
.paper .table-basic th{color:var(--stone-paper);border-bottom-color:#CFC8B6}
.paper .table-basic td{border-bottom-color:#E0DACB}
.paper .table-basic tbody tr:hover{background:#E9E4D7}

/* ===== fold (native details) ===== */
.fold{border-top:1px solid var(--line)}
.fold:last-child{border-bottom:1px solid var(--line)}
.fold-sum{
  display:flex;align-items:center;gap:12px;
  padding:16px 4px;font-size:16px;font-weight:700;color:var(--paper);
  cursor:pointer;list-style:none;
}
.fold-sum::-webkit-details-marker{display:none}
.fold-sum::before{
  content:"";width:0;height:0;flex:0 0 auto;
  border-left:6px solid var(--gold);
  border-top:4px solid transparent;
  border-bottom:4px solid transparent;
  transition:transform .2s var(--ease);
}
.fold[open] .fold-sum::before{transform:rotate(90deg)}
.fold-body{padding:0 4px 20px;border-top:1px solid var(--line);color:var(--stone);font-size:15.5px}
.paper .fold,.paper .fold:last-child{border-color:#CFC8B6}
.paper .fold-sum{color:#0B231D}
.paper .fold-body{border-top-color:#CFC8B6;color:var(--stone-paper)}

/* ===== media frame ===== */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line);background:var(--panel);
}
.media-frame::after{
  content:"";position:absolute;inset:8px;border:1px solid rgba(127,211,232,.16);pointer-events:none;
}
.media-frame img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;filter:saturate(.88) contrast(1.05)}
.media-frame--tall img{aspect-ratio:4/5}
.media-cap{margin-top:10px;font-size:13px;line-height:1.6;color:var(--stone)}

/* ===== tick scale ===== */
.tick-scale{width:100%;max-width:640px;color:var(--line)}
.tick-scale svg{display:block;width:100%;height:auto}

/* ===== to top ===== */
.to-top{
  position:fixed;right:20px;bottom:24px;z-index:70;
  display:none;align-items:center;justify-content:center;
  width:44px;height:44px;
  border:1px solid rgba(201,162,39,.55);
  background:rgba(4,16,13,.86);
  color:var(--gold-soft);
  font-family:var(--font-mono);font-size:15px;line-height:1;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.to-top[data-show]{display:flex}
.to-top:hover{background:var(--gold);border-color:var(--gold);color:var(--deep)}

/* ===== responsive ===== */
@media (max-width:1180px){
  .head-status{display:none}
}
@media (max-width:1080px){
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr;gap:36px 28px}
  .foot-contact{grid-column:1 / -1}
  .foot-contact .foot-list{flex-direction:row;flex-wrap:wrap;gap:12px 28px}
  .foot-note{max-width:52ch}
}
@media (max-width:900px){
  .head-inner{gap:14px}
  .brand-sub{display:none}
  .head-cta{display:none}
  .nav-toggle{display:flex}
  .nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;margin-left:0;
    background:var(--ink);
    border-top:1px solid var(--line);
    border-bottom:1px solid rgba(201,162,39,.5);
    max-height:calc(100vh - var(--head-h-sm));
    overflow-y:auto;
    -webkit-overflow-scrolling:touch;
  }
  .nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding:6px 0 14px}
  .nav-link{
    width:100%;padding:14px 24px;font-size:16px;
    border-bottom:1px solid rgba(30,90,78,.55);
  }
  .nav-link:hover{background:rgba(231,206,134,.08)}
  .nav-link[aria-current="page"]{background:rgba(201,162,39,.12);box-shadow:inset 3px 0 0 var(--gold)}
  .nav-link[aria-current="page"]::after{display:none}
  .head-side{margin-left:auto}
  .grid-2,.grid-3,
  .split-5-7,.split-4-8,.split-3-9{grid-template-columns:minmax(0,1fr)}
  .band{padding:36px 0}
}
@media (max-width:760px){
  body{font-size:16px}
  h1{font-size:28px}
  h2{font-size:24px}
  h3{font-size:20px}
  h4{font-size:18px}
  h5{font-size:17px}
  .wrap,.head-inner{padding:0 18px}
  .foot-grid{grid-template-columns:1fr;padding:40px 18px 32px;gap:32px}
  .foot-contact{grid-column:auto}
  .foot-contact .foot-list{flex-direction:column}
  .foot-base{padding:16px 18px 30px;flex-direction:column;align-items:flex-start;gap:8px}
  .lede{font-size:16.5px}
  .to-top{right:14px;bottom:16px;width:42px;height:42px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .index-strip:hover,.btn:hover{transform:none}
}