:root{
  --ink-950:#0A1424;
  --ink-900:#101F36;
  --slate-700:#2B3B52;
  --slate-500:#5E6F86;
  --mist-200:#D7DEE8;
  --paper-50:#F4F6F9;
  --brass-500:#B7793C;
  --brass-300:#D9A066;
  --signal-500:#E86A2B;
  --bg:var(--paper-50);
  --fg:var(--ink-950);
  --muted:var(--slate-500);
  --line:rgba(43,59,82,.16);
  --line-dark:rgba(215,222,232,.14);
  --font-display:"Helvetica Neue","Arial Narrow","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"Helvetica Neue","PingFang SC","Noto Sans SC","Microsoft YaHei",Arial,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","IBM Plex Mono",Menlo,Consolas,"Courier New",monospace;
  --rail-w:96px;
  --r-sm:10px;
  --r-md:18px;
  --r-lg:28px;
  --r-pill:999px;
  --ease:cubic-bezier(.22,.68,.28,1);
}
@media (max-width:1100px){:root{--rail-w:72px}}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font-body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;text-wrap:pretty}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
h1,h2,h3,h4{margin:0 0 .6em;font-family:var(--font-display);font-weight:800;line-height:1.15;letter-spacing:-.015em;font-stretch:condensed;text-wrap:balance}
h1{font-size:clamp(30px,4.4vw,48px)}
h2{font-size:clamp(22px,2.6vw,28px)}
h3{font-size:clamp(18px,2vw,21px)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

:where(a,button,summary,[tabindex]):focus-visible{outline:2px solid var(--brass-300);outline-offset:3px;box-shadow:0 0 0 5px rgba(183,121,60,.22);border-radius:6px}
#main-content:focus{outline:none}

.skip-link{position:absolute;left:14px;top:-70px;z-index:120;padding:10px 18px;background:var(--brass-300);color:var(--ink-950);font-weight:700;font-size:14px;border-radius:0 0 var(--r-md) var(--r-md);transition:top .18s var(--ease)}
.skip-link:focus{top:0}

/* ---------- header ---------- */
.site-header{position:relative;z-index:60;background:var(--ink-950);color:var(--paper-50);border-bottom:1px solid rgba(183,121,60,.35)}
.masthead{display:grid;grid-template-columns:var(--rail-w) minmax(0,1fr);align-items:stretch}
.masthead__rail{display:flex;flex-direction:column;align-items:center;gap:16px;padding:18px 0 22px;background:var(--ink-900);border-right:1px solid var(--line-dark)}
.rail__mark{font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--brass-300);writing-mode:vertical-rl;text-orientation:mixed}
.rail__rule{flex:1 1 auto;width:1px;min-height:28px;background:repeating-linear-gradient(to bottom,rgba(215,222,232,.42) 0 6px,transparent 6px 12px)}
.rail__coord{font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:var(--slate-500);writing-mode:vertical-rl}
.masthead__body{min-width:0;display:flex;flex-direction:column}

.utility{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;padding:9px clamp(16px,2.6vw,34px);background:var(--ink-900);border-bottom:1px solid rgba(215,222,232,.08);font-size:12px}
.utility__brand{margin:0;color:var(--mist-200);letter-spacing:.05em;font-size:12px}
.utility__list{display:flex;align-items:center;gap:6px 20px;flex-wrap:wrap}
.utility__link{color:var(--brass-300);padding:2px 0;border-bottom:1px solid transparent;transition:border-color .2s var(--ease),color .2s var(--ease)}
.utility__link:hover{border-bottom-color:var(--brass-300);color:var(--paper-50)}
.utility__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--slate-500)}
.utility__meta .mono{color:var(--brass-300)}

.nav-row{position:relative;display:flex;align-items:center;gap:clamp(14px,2.4vw,36px);padding:14px clamp(16px,2.6vw,34px) 15px}
.brand{display:flex;align-items:baseline;gap:10px;color:var(--paper-50);flex-wrap:wrap}
.brand__index{font-size:11px;color:var(--brass-500);padding:2px 7px;border:1px solid rgba(183,121,60,.5);border-radius:var(--r-pill)}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:clamp(17px,1.9vw,21px);letter-spacing:.01em;font-stretch:condensed;white-space:nowrap}
.brand__suffix{font-family:var(--font-mono);font-size:.8em;color:var(--brass-300);margin-left:3px;letter-spacing:.08em}
.brand__sub{font-size:11px;color:var(--slate-500);letter-spacing:.16em;white-space:nowrap}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.site-nav__link{display:inline-flex;align-items:baseline;gap:7px;padding:9px 13px;border-radius:var(--r-pill);border:1px solid transparent;color:var(--mist-200);font-size:14px;line-height:1;transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease)}
.site-nav__num{font-size:10px;color:var(--brass-500);letter-spacing:.1em;transition:color .2s var(--ease)}
.site-nav__label{white-space:nowrap}
.site-nav__link:hover{background:rgba(215,222,232,.08);border-color:rgba(183,121,60,.55);color:var(--paper-50)}
.site-nav__link[aria-current="page"]{background:var(--brass-300);border-color:var(--brass-300);color:var(--ink-950);font-weight:700}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--ink-950)}

.nav-toggle{display:none;align-items:center;gap:9px;margin-left:auto;padding:9px 15px;background:transparent;border:1px solid rgba(183,121,60,.55);border-radius:var(--r-pill);color:var(--brass-300);font-size:13px;letter-spacing:.08em;cursor:pointer;transition:background .2s var(--ease),color .2s var(--ease)}
.nav-toggle:hover{background:rgba(183,121,60,.16)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:12px}
.nav-toggle__bars i{display:block;height:1.5px;width:100%;background:currentColor;border-radius:2px;transition:transform .24s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) 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(-5.5px) rotate(-45deg)}

.scroll-progress{position:fixed;top:0;left:0;right:0;height:2px;background:rgba(215,222,232,.1);z-index:90;pointer-events:none}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brass-500),var(--signal-500))}

/* ---------- footer ---------- */
.site-footer{position:relative;background:var(--ink-950);color:var(--mist-200);border-top:3px solid var(--brass-500);overflow:hidden}
.site-footer::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:repeating-linear-gradient(90deg,rgba(215,222,232,.045) 0 1px,transparent 1px 68px),repeating-linear-gradient(0deg,rgba(215,222,232,.045) 0 1px,transparent 1px 68px)}
.footer__grid{position:relative;display:grid;grid-template-columns:1.25fr .9fr 1.15fr;gap:clamp(26px,4vw,64px);max-width:1240px;margin:0 auto;padding:clamp(40px,6vw,72px) clamp(18px,3.4vw,40px) clamp(32px,4vw,52px)}
.footer__kicker{margin:0 0 14px;font-size:11px;letter-spacing:.26em;color:var(--brass-500)}
.footer__logo{margin:0 0 12px;font-family:var(--font-display);font-weight:800;font-size:clamp(22px,2.6vw,28px);color:var(--paper-50);letter-spacing:-.01em;font-stretch:condensed}
.footer__note{margin:0 0 22px;font-size:13px;line-height:1.7;color:var(--slate-500);max-width:30ch}
.footer__title{margin:0 0 16px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.26em;color:var(--brass-300);text-transform:uppercase}
.footer__list{display:grid;gap:2px}
.footer__item{border-bottom:1px solid rgba(215,222,232,.07)}
.footer__link{display:flex;align-items:center;gap:12px;min-height:44px;font-size:14px;color:var(--mist-200);transition:color .18s var(--ease),padding-left .18s var(--ease)}
.footer__link:hover{color:var(--brass-300);padding-left:6px}
.footer__num{font-size:10px;color:var(--brass-500);letter-spacing:.12em;min-width:20px}
.footer__contact-list{display:grid;gap:12px}
.footer__contact-item{display:grid;grid-template-columns:52px minmax(0,1fr);gap:10px;align-items:baseline;font-size:13.5px;line-height:1.55}
.footer__key{font-size:10px;letter-spacing:.14em;color:var(--slate-500)}
.footer__val{color:var(--mist-200);word-break:break-word}
.footer__base{position:relative;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;max-width:1240px;margin:0 auto;padding:18px clamp(18px,3.4vw,40px) 24px;border-top:1px solid rgba(215,222,232,.12);font-size:12px;color:var(--slate-500)}
.footer__legal{display:flex;align-items:center;flex-wrap:wrap;gap:8px 18px;margin:0}
.footer__legal a{color:var(--slate-500);border-bottom:1px solid rgba(215,222,232,.2);padding-bottom:1px;transition:color .18s var(--ease),border-color .18s var(--ease)}
.footer__legal a:hover{color:var(--brass-300);border-color:var(--brass-300)}
.footer__copy{margin:0;font-size:11px;letter-spacing:.08em}

/* ---------- page skeleton ---------- */
.page{display:grid;grid-template-columns:var(--rail-w) minmax(0,1fr);align-items:start}
.page__rail{position:sticky;top:20px;align-self:start;display:flex;flex-direction:column;align-items:center;gap:14px;padding:30px 0 20px}
.rail-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--brass-500);writing-mode:vertical-rl}
.rail-line{width:1px;flex:1 1 auto;min-height:44px;background:repeating-linear-gradient(to bottom,rgba(43,59,82,.35) 0 5px,transparent 5px 11px)}
.page__body{min-width:0;padding:clamp(28px,4vw,56px) clamp(18px,3.4vw,40px) clamp(56px,7vw,96px)}
.wrap{width:100%;max-width:1120px}

/* ---------- generic blocks ---------- */
.kicker{display:inline-flex;align-items:center;gap:9px;margin:0 0 16px;font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;color:var(--brass-500);text-transform:uppercase}
.kicker::before{content:"";width:22px;height:1px;background:var(--brass-500)}
.lede{margin:0 0 20px;font-size:clamp(16px,1.8vw,18px);line-height:1.7;color:var(--slate-700);max-width:62ch}
.note{margin:0;font-size:12.5px;line-height:1.7;color:var(--slate-500);max-width:64ch}

.section{padding:clamp(28px,4vw,52px) 0;border-top:1px solid var(--line)}
.section:first-of-type{border-top:0;padding-top:0}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:10px 22px;margin-bottom:clamp(20px,2.6vw,32px)}
.section__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--brass-500);padding-bottom:6px}
.section__title{margin:0;font-size:clamp(22px,2.8vw,30px);font-weight:800;color:var(--ink-950)}
.section__lede{margin:0;flex:1 1 320px;font-size:14px;color:var(--slate-500);line-height:1.7}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}

.divider{height:1px;border:0;margin:clamp(24px,3vw,40px) 0;background:linear-gradient(90deg,var(--brass-500),rgba(43,59,82,.16) 40%,rgba(43,59,82,.16))}
.lattice{position:relative}
.lattice::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:repeating-linear-gradient(90deg,rgba(215,222,232,.06) 0 1px,transparent 1px 56px),repeating-linear-gradient(0deg,rgba(215,222,232,.06) 0 1px,transparent 1px 56px)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 24px;border-radius:var(--r-pill);border:1px solid transparent;font-size:14px;font-weight:700;line-height:1;letter-spacing:.02em;cursor:pointer;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease)}
.btn__arrow{font-family:var(--font-mono);transition:transform .2s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(4px)}
.btn--ghost{border-color:rgba(217,160,102,.6);color:var(--brass-300);background:transparent}
.btn--ghost:hover{background:var(--brass-300);color:var(--ink-950);border-color:var(--brass-300)}
.btn--solid{background:var(--brass-500);color:var(--ink-950)}
.btn--solid:hover{background:var(--brass-300);transform:translateY(-1px)}

/* ---------- breadcrumb ---------- */
.breadcrumb{margin:0 0 clamp(20px,3vw,32px)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--slate-500)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(43,59,82,.4)}
.breadcrumb__link{color:var(--slate-500);transition:color .18s var(--ease)}
.breadcrumb__link:hover{color:var(--brass-500)}

/* ---------- card ---------- */
.card{position:relative;padding:clamp(20px,2.4vw,28px);background:var(--paper-50);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:0 20px 40px -34px rgba(10,20,36,.5);transition:border-color .22s var(--ease),transform .22s var(--ease)}
.card:hover{border-color:rgba(183,121,60,.55);transform:translateY(-2px)}
.card--offset{margin-top:clamp(0px,3vw,34px)}
.card--dark{background:var(--ink-900);border-color:rgba(215,222,232,.14);color:var(--paper-50)}
.card__num{display:block;margin-bottom:12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--brass-500)}
.card__title{margin:0 0 8px;font-size:clamp(18px,2vw,21px);font-weight:800;color:inherit}
.card__text{margin:0 0 14px;font-size:14px;line-height:1.7;color:var(--slate-700)}
.card--dark .card__text{color:var(--mist-200)}
.card__meta{display:flex;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--slate-500)}

/* ---------- tags & chips ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:var(--r-pill);border:1px solid rgba(183,121,60,.45);background:rgba(183,121,60,.08);font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--brass-500)}
.tag--signal{border-color:rgba(232,106,43,.55);background:rgba(232,106,43,.12);color:#9C3F12}
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 clamp(18px,2.4vw,26px)}
.filter-count{margin-left:auto;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--slate-500)}
.chip{padding:8px 16px;border-radius:var(--r-pill);border:1px solid var(--line);background:transparent;font-size:13px;line-height:1;color:var(--slate-700);cursor:pointer;transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease)}
.chip:hover{border-color:rgba(183,121,60,.6);color:var(--ink-950)}
.chip[aria-pressed="true"]{background:var(--ink-950);border-color:var(--ink-950);color:var(--paper-50)}

/* ---------- data list ---------- */
.data-list{border-top:1px solid var(--line)}
.data-list__row{border-bottom:1px solid var(--line)}
.data-list__row > summary{display:grid;grid-template-columns:56px minmax(0,1fr) auto;gap:14px;align-items:center;min-height:48px;padding:12px 6px;list-style:none;cursor:pointer;font-size:15px;transition:background .18s var(--ease)}
.data-list__row > summary::-webkit-details-marker{display:none}
.data-list__row > summary:hover{background:rgba(183,121,60,.07)}
.data-list__row[open] > summary{background:rgba(183,121,60,.1)}
.data-list__key{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--brass-500)}
.data-list__val{font-family:var(--font-mono);font-size:13.5px;color:var(--ink-950);letter-spacing:.04em}
.data-list__body{padding:2px 6px 20px 76px;font-size:14px;line-height:1.7;color:var(--slate-700)}

/* ---------- legend ---------- */
.legend{display:flex;flex-wrap:wrap;gap:10px 18px;padding:14px 16px;border:1px dashed rgba(43,59,82,.28);border-radius:var(--r-md);background:rgba(215,222,232,.28)}
.legend__item{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--slate-700)}
.legend__swatch{width:12px;height:12px;border-radius:3px;background:var(--brass-500);flex:0 0 auto}
.legend__swatch--signal{background:var(--signal-500)}
.legend__swatch--ink{background:var(--ink-900)}

/* ---------- media ---------- */
.media{margin:0;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);background:var(--ink-900)}
.media__frame{position:relative;display:block;width:100%;aspect-ratio:16/9;background-image:repeating-linear-gradient(90deg,rgba(215,222,232,.1) 0 1px,transparent 1px 44px),repeating-linear-gradient(0deg,rgba(215,222,232,.1) 0 1px,transparent 1px 44px),linear-gradient(150deg,#12233D,#0A1424)}
.media--square .media__frame{aspect-ratio:1/1}
.media--tall .media__frame{aspect-ratio:4/5}
.media__img{width:100%;height:100%;object-fit:cover}
.media__caption{padding:12px 16px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--mist-200);background:var(--ink-900);border-top:1px solid rgba(215,222,232,.12)}

/* ---------- reveal ---------- */
.js-ready [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .62s var(--ease),transform .62s var(--ease)}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1020px){
  .masthead{grid-template-columns:minmax(0,1fr)}
  .masthead__rail{display:none}
  .nav-toggle{display:inline-flex}
  .brand__sub{display:none}
  .site-nav{position:absolute;top:calc(100% + 1px);left:0;right:0;margin-left:0;display:none;padding:10px 14px 20px;background:var(--ink-900);border-top:1px solid rgba(215,222,232,.14);box-shadow:0 26px 44px -28px rgba(0,0,0,.85)}
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .site-nav__link{padding:13px 14px;border-radius:var(--r-sm);justify-content:flex-start;font-size:15px}
  .page{grid-template-columns:minmax(0,1fr)}
  .page__rail{display:none}
  .page__body{padding:26px 18px 64px}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1 / -1}
  .footer__note{max-width:52ch}
}
@media (max-width:680px){
  .utility{padding:8px 16px;gap:6px 14px}
  .utility__brand{font-size:11px;letter-spacing:.02em}
  .utility__meta{display:none}
  .nav-row{padding:12px 16px 13px}
  .footer__grid{grid-template-columns:1fr;gap:28px;padding:36px 18px 28px}
  .footer__base{flex-direction:column;align-items:flex-start;padding:16px 18px 22px}
  .grid--12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .data-list__row > summary{grid-template-columns:44px minmax(0,1fr);row-gap:6px;font-size:14px}
  .data-list__body{padding-left:6px}
}
@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}
}