:root{
  --bd-ink:#071A2B;
  --bd-ink-2:#0E2A44;
  --bd-mist:#8FA6B8;
  --bd-signal:#37F2C4;
  --bd-signal-deep:#0F8F78;
  --bd-amber:#FF9F43;
  --bd-paper:#F4F7F5;
  --bd-black:#020608;
  --bd-soft:#C9D4DC;
  --bd-teal:#063B3A;
  --bd-shell:1180px;
  --bd-font-display:'Barlow Condensed','Noto Sans SC','PingFang SC','Hiragino Sans GB',sans-serif;
  --bd-font-serif:'Noto Serif SC','Songti SC','SimSun',serif;
  --bd-font-body:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --bd-font-mono:'IBM Plex Mono','SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --bd-shadow:6px 6px 0 rgba(2,6,8,.55);
  --bd-hair:1px solid rgba(143,166,184,.22);
  --bd-hair-strong:2px solid var(--bd-black);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bd-ink);
  color:var(--bd-paper);
  font-family:var(--bd-font-body);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--bd-font-display);
  font-weight:700;
  font-stretch:condensed;
  letter-spacing:-.01em;
  line-height:1.02;
}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--bd-signal);outline-offset:3px;border-radius:2px}
::selection{background:var(--bd-signal);color:var(--bd-black)}

.bd-shell{width:min(var(--bd-shell),100% - 2.5rem);margin-inline:auto}
#main-content{display:block}
.bd-visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- skip link ---------- */
.bd-skip{
  position:absolute;left:14px;top:-80px;z-index:200;
  display:inline-block;
  background:var(--bd-signal);color:var(--bd-black);
  font-family:var(--bd-font-display);font-weight:700;font-size:.95rem;letter-spacing:.06em;
  padding:.6rem 1.1rem;border:2px solid var(--bd-black);
  transition:top .16s ease;
}
.bd-skip:focus{top:14px}

/* ---------- header ---------- */
.bd-header{position:relative;z-index:80;background:var(--bd-ink);color:var(--bd-paper)}

.bd-progress{position:fixed;inset:0 0 auto 0;height:3px;z-index:120;pointer-events:none;background:rgba(2,6,8,.35)}
.bd-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--bd-signal-deep),var(--bd-signal))}

.bd-header__upper{background:var(--bd-black);border-bottom:var(--bd-hair)}
.bd-header__upper-inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center;
  gap:1.4rem;
  min-height:58px;
  padding-block:.55rem;
}
.bd-brand{display:inline-flex;align-items:baseline;gap:.6rem;white-space:nowrap}
.bd-brand__mark{
  font-family:var(--bd-font-display);font-weight:700;
  font-size:1.5rem;letter-spacing:.16em;line-height:1;
  color:var(--bd-paper);
}
.bd-brand__sub{
  font-family:var(--bd-font-mono);
  font-size:.7rem;letter-spacing:.24em;
  color:var(--bd-signal);
}
.bd-header__line{
  font-family:var(--bd-font-mono);
  font-size:.74rem;letter-spacing:.12em;
  color:var(--bd-mist);
  border-left:2px solid var(--bd-signal-deep);
  padding-left:.9rem;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.bd-status{display:inline-flex;align-items:center;gap:.55rem;white-space:nowrap}
.bd-status__light{
  width:9px;height:9px;flex:0 0 9px;
  background:var(--bd-signal);
  box-shadow:0 0 0 3px rgba(55,242,196,.18);
  animation:bd-pulse 2.8s ease-in-out infinite;
}
.bd-status__text{font-family:var(--bd-font-mono);font-size:.72rem;letter-spacing:.12em;color:var(--bd-soft)}
@keyframes bd-pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 3px rgba(55,242,196,.18)}
  50%{opacity:.5;box-shadow:0 0 0 7px rgba(55,242,196,.05)}
}

.bd-cta{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--bd-font-display);font-weight:700;
  font-size:.95rem;letter-spacing:.1em;
  padding:.58rem 1.15rem;
  border:2px solid var(--bd-signal);
  transition:background .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.bd-cta--signal{background:var(--bd-signal);color:var(--bd-black)}
.bd-cta--signal:hover,.bd-cta--signal:focus-visible{
  background:var(--bd-paper);border-color:var(--bd-paper);color:var(--bd-black);
  box-shadow:4px 4px 0 rgba(55,242,196,.28);
}

.bd-header__lower{background:var(--bd-ink);border-bottom:3px solid var(--bd-black)}
.bd-header__lower-inner{display:flex;align-items:stretch;justify-content:space-between;gap:1rem}
.bd-nav{flex:1 1 auto;min-width:0}
.bd-nav__list{display:flex;justify-content:space-between;align-items:stretch;gap:0}
.bd-nav__item{display:flex}
.bd-nav__link{
  position:relative;
  display:flex;align-items:baseline;gap:.45rem;
  padding:1.05rem .9rem;
  font-family:var(--bd-font-display);font-weight:600;
  font-size:1.02rem;letter-spacing:.07em;
  color:var(--bd-mist);
  transition:color .16s ease,background .16s ease;
}
.bd-nav__num{
  font-family:var(--bd-font-mono);
  font-size:.65rem;letter-spacing:.06em;
  color:var(--bd-signal-deep);
  transition:color .16s ease;
}
.bd-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;
  background:var(--bd-signal);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .22s ease;
}
.bd-nav__link:hover,.bd-nav__link:focus-visible{color:var(--bd-paper);background:rgba(55,242,196,.07)}
.bd-nav__link:hover .bd-nav__num,.bd-nav__link:focus-visible .bd-nav__num{color:var(--bd-signal)}
.bd-nav__link:hover::after,.bd-nav__link:focus-visible::after{transform:scaleX(1)}
.bd-nav__link[aria-current="page"]{color:var(--bd-paper);background:rgba(55,242,196,.11)}
.bd-nav__link[aria-current="page"] .bd-nav__num{color:var(--bd-signal)}
.bd-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.bd-navtoggle{
  display:none;align-items:center;gap:.7rem;
  padding:.95rem .2rem;
  font-family:var(--bd-font-display);font-weight:700;
  font-size:.92rem;letter-spacing:.18em;
  color:var(--bd-paper);
}
.bd-navtoggle__bars{position:relative;display:block;width:22px;height:2px;background:var(--bd-signal)}
.bd-navtoggle__bars::before,.bd-navtoggle__bars::after{
  content:"";position:absolute;left:0;width:22px;height:2px;background:var(--bd-signal);
  transition:transform .2s ease,top .2s ease,background .2s ease;
}
.bd-navtoggle__bars::before{top:-7px}
.bd-navtoggle__bars::after{top:7px}
.bd-navtoggle[aria-expanded="true"] .bd-navtoggle__bars{background:transparent}
.bd-navtoggle[aria-expanded="true"] .bd-navtoggle__bars::before{top:0;transform:rotate(45deg)}
.bd-navtoggle[aria-expanded="true"] .bd-navtoggle__bars::after{top:0;transform:rotate(-45deg)}

/* ---------- buttons ---------- */
.bd-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  font-family:var(--bd-font-display);font-weight:700;
  font-size:1rem;letter-spacing:.1em;
  padding:.75rem 1.4rem;
  border:2px solid var(--bd-signal);
  background:var(--bd-signal);color:var(--bd-black);
  transition:background .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.bd-btn:hover,.bd-btn:focus-visible{background:transparent;color:var(--bd-signal);box-shadow:5px 5px 0 rgba(55,242,196,.18)}
.bd-btn--ghost{background:transparent;color:var(--bd-signal)}
.bd-btn--ghost:hover,.bd-btn--ghost:focus-visible{background:var(--bd-signal);color:var(--bd-black);box-shadow:5px 5px 0 rgba(2,6,8,.5)}
.bd-btn--paper{background:var(--bd-paper);border-color:var(--bd-paper);color:var(--bd-black)}
.bd-btn--paper:hover,.bd-btn--paper:focus-visible{background:transparent;color:var(--bd-paper);box-shadow:5px 5px 0 rgba(2,6,8,.5)}

/* ---------- breadcrumbs ---------- */
.bd-crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  padding-block:1.15rem;
  font-family:var(--bd-font-mono);
  font-size:.73rem;letter-spacing:.1em;
  color:var(--bd-mist);
}
.bd-crumbs a{color:var(--bd-mist);border-bottom:1px solid transparent;transition:color .16s ease,border-color .16s ease}
.bd-crumbs a:hover,.bd-crumbs a:focus-visible{color:var(--bd-signal);border-bottom-color:var(--bd-signal)}
.bd-crumbs__sep{color:var(--bd-signal-deep)}

/* ---------- page head ---------- */
.bd-page-head{
  position:relative;
  padding-block:clamp(2rem,5vw,3.6rem) clamp(1.25rem,3vw,2rem);
  border-bottom:3px solid var(--bd-black);
  overflow:hidden;
}
.bd-page-head__num{
  display:block;
  font-family:var(--bd-font-mono);
  font-size:.72rem;letter-spacing:.3em;
  color:var(--bd-signal);
  margin-bottom:.9rem;
}
.bd-page-head__title{
  font-size:clamp(2.4rem,6vw,4.6rem);
  color:var(--bd-paper);
  max-width:18ch;
}
.bd-page-head__lead{
  margin-top:1rem;
  max-width:64ch;
  font-size:1rem;
  color:var(--bd-mist);
  line-height:1.6;
}

/* ---------- sections / grids ---------- */
.bd-section{padding-block:clamp(2.5rem,6vw,5rem)}
.bd-section--tight{padding-block:clamp(1.5rem,3.5vw,2.75rem)}
.bd-eyebrow{
  display:block;
  font-family:var(--bd-font-mono);
  font-size:.72rem;letter-spacing:.28em;text-transform:uppercase;
  color:var(--bd-signal);
}
.bd-grid{display:grid;gap:1.5rem}
.bd-grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.bd-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.bd-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}

/* ---------- panel / tag ---------- */
.bd-panel{
  background:var(--bd-ink-2);
  border:2px solid var(--bd-black);
  box-shadow:var(--bd-shadow);
  padding:1.35rem;
}
.bd-tag{
  display:inline-flex;align-items:center;gap:.4rem;
  font-family:var(--bd-font-mono);
  font-size:.69rem;letter-spacing:.16em;text-transform:uppercase;
  padding:.28rem .55rem;
  border:1px solid var(--bd-signal-deep);
  color:var(--bd-signal);
  background:rgba(55,242,196,.07);
}
.bd-tag--amber{
  color:var(--bd-amber);
  border-color:rgba(255,159,67,.55);
  background:rgba(255,159,67,.1);
}

/* ---------- prose ---------- */
.bd-prose{max-width:72ch;font-size:1rem;line-height:1.7;color:var(--bd-soft)}
.bd-prose h2{font-size:clamp(1.55rem,3vw,2.15rem);color:var(--bd-paper);margin-block:2rem .7rem}
.bd-prose h3{font-size:1.18rem;color:var(--bd-paper);margin-block:1.5rem .5rem}
.bd-prose p{margin-block:.85rem}
.bd-prose strong{color:var(--bd-paper)}
.bd-prose a{color:var(--bd-signal);border-bottom:1px solid currentColor}
.bd-prose a:hover,.bd-prose a:focus-visible{background:rgba(55,242,196,.12)}
.bd-prose ul,.bd-prose ol{margin-block:.9rem;padding-left:1.1rem}
.bd-prose ul li{position:relative;padding-left:1rem;margin-block:.35rem}
.bd-prose ul li::before{content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;background:var(--bd-signal)}
.bd-prose ol{list-style:decimal;color:var(--bd-soft)}
.bd-prose ol li{margin-block:.35rem}
.bd-prose blockquote{
  margin:1.5rem 0;padding:.9rem 1.2rem;
  border-left:3px solid var(--bd-signal);
  background:rgba(14,42,68,.7);
  font-family:var(--bd-font-serif);
  font-size:1.08rem;color:var(--bd-paper);
}

/* ---------- figure ---------- */
.bd-figure{
  position:relative;margin:0;overflow:hidden;
  border:2px solid var(--bd-black);
  background:var(--bd-teal);
  box-shadow:var(--bd-shadow);
  aspect-ratio:16/9;
}
.bd-figure img{width:100%;height:100%;object-fit:cover}
.bd-figure--wide{aspect-ratio:21/9}
.bd-figure--tall{aspect-ratio:4/5}
.bd-figure__cap{
  position:absolute;left:0;bottom:0;
  background:rgba(2,6,8,.86);
  color:var(--bd-soft);
  font-family:var(--bd-font-mono);
  font-size:.7rem;letter-spacing:.08em;
  padding:.4rem .7rem;
  border-top:1px solid rgba(55,242,196,.35);
  border-right:1px solid rgba(55,242,196,.35);
}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .45s ease,transform .45s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- footer ---------- */
.bd-footer{
  position:relative;
  background:var(--bd-black);
  color:var(--bd-paper);
  border-top:3px solid var(--bd-signal);
}
.bd-footer__inner{padding-block:3rem 1.6rem}
.bd-footer__top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.9fr);
  gap:2.5rem;
  padding-bottom:2.4rem;
  border-bottom:var(--bd-hair);
}
.bd-footer__wordmark{
  font-family:var(--bd-font-display);font-weight:700;
  font-size:clamp(2.4rem,5vw,3.6rem);
  letter-spacing:.1em;line-height:.9;
  color:var(--bd-paper);
}
.bd-footer__kicker{
  margin-top:.7rem;
  font-family:var(--bd-font-mono);
  font-size:.7rem;letter-spacing:.3em;
  color:var(--bd-signal);
}
.bd-footer__blurb{
  margin-top:1rem;
  max-width:32ch;
  font-family:var(--bd-font-serif);
  font-size:.98rem;line-height:1.65;
  color:var(--bd-mist);
}
.bd-footer__nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1.75rem;
}
.bd-footer__coltitle{
  font-family:var(--bd-font-mono);font-weight:400;
  font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--bd-signal);
  margin-bottom:.9rem;
  padding-bottom:.55rem;
  border-bottom:1px solid rgba(55,242,196,.24);
}
.bd-footer__links{display:flex;flex-direction:column;gap:.55rem}
.bd-footer__link{
  display:inline-block;
  font-size:.94rem;
  color:var(--bd-soft);
  padding-block:.1rem;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.bd-footer__link:hover,.bd-footer__link:focus-visible{color:var(--bd-paper);border-bottom-color:var(--bd-signal)}
.bd-footer__contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:1.5rem 2rem;
  padding-block:2rem;
  border-bottom:var(--bd-hair);
}
.bd-footer__citem{min-width:0}
.bd-footer__cterm{
  font-family:var(--bd-font-mono);
  font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--bd-mist);
  margin-bottom:.4rem;
}
.bd-footer__cval{
  font-family:var(--bd-font-mono);
  font-size:.95rem;
  color:var(--bd-paper);
  overflow-wrap:anywhere;
}
.bd-footer__note{
  grid-column:1 / -1;
  font-size:.84rem;line-height:1.6;
  color:var(--bd-mist);
  max-width:74ch;
  border-left:2px solid var(--bd-signal-deep);
  padding-left:.85rem;
}
.bd-footer__legal{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;
  padding-top:1.3rem;
  font-family:var(--bd-font-mono);
  font-size:.75rem;letter-spacing:.07em;
  color:var(--bd-mist);
}
.bd-footer__copy,.bd-footer__icp{margin:0}
.bd-footer__icp{color:var(--bd-soft)}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .bd-header__upper-inner{grid-template-columns:auto minmax(0,1fr) auto;gap:1rem}
  .bd-status{display:none}
  .bd-navtoggle{display:inline-flex}
  .bd-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:var(--bd-ink-2);
    border-bottom:3px solid var(--bd-black);
    box-shadow:0 26px 44px -22px rgba(2,6,8,.95);
    max-height:calc(100vh - 96px);
    overflow-y:auto;
    z-index:95;
  }
  .bd-nav[data-open="true"]{display:block}
  .bd-nav__list{flex-direction:column;justify-content:flex-start}
  .bd-nav__item{border-bottom:var(--bd-hair)}
  .bd-nav__item:last-child{border-bottom:0}
  .bd-nav__link{width:100%;padding:1rem 1.2rem;font-size:1.05rem}
  .bd-nav__link::after{display:none}
  .bd-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--bd-signal);background:rgba(55,242,196,.12)}
  .bd-grid--8-4,.bd-grid--3,.bd-grid--2{grid-template-columns:minmax(0,1fr)}
  .bd-footer__top{grid-template-columns:minmax(0,1fr);gap:2rem}
}
@media (max-width:720px){
  .bd-shell{width:calc(100% - 1.75rem)}
  .bd-header__line{display:none}
  .bd-header__upper-inner{grid-template-columns:minmax(0,1fr) auto;gap:.75rem}
  .bd-brand__mark{font-size:1.3rem;letter-spacing:.12em}
  .bd-brand__sub{font-size:.62rem;letter-spacing:.18em}
  .bd-cta{font-size:.82rem;letter-spacing:.06em;padding:.5rem .8rem}
  .bd-footer__nav{grid-template-columns:minmax(0,1fr);gap:1.4rem}
  .bd-footer__contact{grid-template-columns:minmax(0,1fr)}
  .bd-footer__legal{flex-direction:column;align-items:flex-start}
  .bd-figure--wide{aspect-ratio:16/9}
}
@media (max-width:420px){
  .bd-brand__sub{display:none}
  .bd-cta{font-size:.76rem;padding:.45rem .6rem}
}

/* ---------- motion / print ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .bd-progress__bar{transition:none}
}
@media print{
  .bd-header,.bd-footer,.bd-progress,.bd-skip{display:none !important}
  body{background:#fff;color:#000}
  .bd-panel,.bd-figure{box-shadow:none;border-color:#000}
  .bd-prose{color:#000;max-width:none}
}