:root{
  --sf-night:#060A13;
  --sf-teal:#0A2B2D;
  --sf-indigo:#181338;
  --sf-wine:#2B0D18;
  --sf-pearl:#F6F1E7;
  --sf-cyan:#39F4D4;
  --sf-orange:#FF7A2F;
  --sf-amber:#FFC857;
  --sf-steel:#263043;
  --sf-ink:#121722;
  --sf-text:#E6ECF5;
  --sf-text-dim:#93A1B9;
  --sf-rail-w:266px;
  --sf-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --sf-serif:"Noto Serif SC","Songti SC",Georgia,serif;
  --sf-mono:"JetBrains Mono","IBM Plex Mono",Consolas,"Courier New",monospace;
  --sf-line:1px solid var(--sf-steel);
  --sf-line-soft:1px solid rgba(38,48,67,.62);
  --sf-shadow:0 24px 48px -34px rgba(0,0,0,.95);
  --sf-ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--sf-night);scroll-behavior:smooth}
body{
  margin:0;padding:0;
  font-family:var(--sf-sans);font-size:16px;line-height:1.75;
  color:var(--sf-text);background:transparent;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(rgba(57,244,212,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(57,244,212,.045) 1px,transparent 1px);
  background-size:72px 72px;opacity:.5;
}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0}
img,svg{max-width:100%;height:auto;display:block}
button{font:inherit;color:inherit}
a{color:var(--sf-cyan)}
:focus-visible{outline:2px solid var(--sf-cyan);outline-offset:3px;border-radius:2px}
::selection{background:rgba(57,244,212,.28);color:#fff}
.sf-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- skip link ---------- */
.sf-skip{
  position:fixed;top:10px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  background:var(--sf-cyan);color:#04211C;font-weight:800;font-size:14px;
  padding:10px 20px;border-radius:2px;text-decoration:none;
  transition:transform .2s var(--sf-ease);
}
.sf-skip:focus{transform:translate(-50%,0)}

/* ---------- header shell ---------- */
.sf-header{
  position:fixed;top:0;bottom:0;left:0;z-index:90;
  width:var(--sf-rail-w);
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,#070C17 0%,var(--sf-night) 52%,#08121B 100%);
  border-right:var(--sf-line);
}
.sf-topbar{display:none}
.sf-rail{
  flex:1 1 auto;min-height:0;display:flex;flex-direction:column;gap:24px;
  padding:28px 20px 22px;overflow-y:auto;
  scrollbar-width:thin;scrollbar-color:var(--sf-steel) transparent;
}
.sf-rail::-webkit-scrollbar{width:6px}
.sf-rail::-webkit-scrollbar-thumb{background:var(--sf-steel);border-radius:3px}
.sf-brand{
  display:grid;gap:6px;text-decoration:none;color:var(--sf-text);
  border-left:2px solid var(--sf-cyan);padding-left:13px;
}
.sf-brand__mark{font-size:22px;font-weight:900;letter-spacing:.06em;line-height:1.2}
.sf-brand__tag{
  font-family:var(--sf-mono);font-size:10.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--sf-cyan);
}
.sf-nav{flex:1 1 auto;min-height:0}
.sf-nav__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.sf-nav__item{list-style:none}
.sf-nav__link{
  position:relative;display:grid;grid-template-columns:26px 1fr;align-items:center;gap:10px;
  padding:11px 10px 11px 12px;border-radius:2px;
  color:#A9B6CC;text-decoration:none;font-size:14.5px;letter-spacing:.02em;
  transition:color .18s var(--sf-ease),background-color .18s var(--sf-ease);
}
.sf-nav__link::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:2px;
  background:transparent;transition:background-color .18s var(--sf-ease);
}
.sf-nav__num{font-family:var(--sf-mono);font-size:11px;letter-spacing:.06em;color:#4B5A73;transition:color .18s}
.sf-nav__label{position:relative;z-index:1}
.sf-nav__link:hover{background:rgba(57,244,212,.07);color:#fff}
.sf-nav__link:hover .sf-nav__num{color:var(--sf-cyan)}
.sf-nav__link[aria-current="page"]{
  background:rgba(57,244,212,.11);color:var(--sf-cyan);font-weight:700;
}
.sf-nav__link[aria-current="page"]::before{background:var(--sf-cyan)}
.sf-nav__link[aria-current="page"] .sf-nav__num{color:var(--sf-cyan)}
.sf-rail__foot{display:grid;gap:12px;padding-top:16px;border-top:var(--sf-line-soft)}
.sf-cta{
  display:flex;align-items:center;justify-content:center;
  padding:12px 14px;border-radius:2px;text-decoration:none;
  background:var(--sf-orange);color:#1A0900;
  font-size:14px;font-weight:800;letter-spacing:.05em;
  transition:background-color .18s var(--sf-ease),box-shadow .18s var(--sf-ease);
}
.sf-cta:hover{background:#FF9457;box-shadow:0 0 0 1px rgba(255,122,47,.55),0 14px 26px -18px var(--sf-orange)}
.sf-rail__meta{
  font-family:var(--sf-mono);font-size:10.5px;letter-spacing:.14em;
  color:#5A6A84;text-align:center;
}
.sf-burger{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:42px;padding:0 9px;flex:0 0 auto;
  background:transparent;border:1px solid var(--sf-steel);border-radius:2px;cursor:pointer;
}
.sf-burger__bar{display:block;height:2px;background:var(--sf-text);transition:transform .22s var(--sf-ease),opacity .18s var(--sf-ease)}
.sf-header[data-open] .sf-burger__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.sf-header[data-open] .sf-burger__bar:nth-child(2){opacity:0}
.sf-header[data-open] .sf-burger__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.sf-topbar__label{font-size:15px;font-weight:800;letter-spacing:.08em;color:var(--sf-pearl)}
.sf-topbar__status{
  margin-left:auto;display:inline-flex;align-items:center;gap:7px;
  font-family:var(--sf-mono);font-size:10.5px;letter-spacing:.12em;color:var(--sf-cyan);
}
.sf-topbar__dot{width:6px;height:6px;border-radius:50%;background:var(--sf-cyan);box-shadow:0 0 9px rgba(57,244,212,.85)}
.sf-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:120;background:rgba(38,48,67,.55)}
.sf-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--sf-cyan),var(--sf-amber),var(--sf-orange))}
.sf-to-top{
  position:fixed;right:20px;bottom:20px;z-index:110;
  width:44px;height:44px;display:grid;place-items:center;
  background:rgba(10,43,45,.92);color:var(--sf-cyan);
  border:1px solid rgba(57,244,212,.45);border-radius:2px;cursor:pointer;
  font-size:16px;line-height:1;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s var(--sf-ease),transform .22s var(--sf-ease),visibility .22s;
}
.sf-to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.sf-to-top:hover{background:rgba(57,244,212,.16)}

/* ---------- footer ---------- */
.sf-footer{
  position:relative;margin-top:clamp(64px,9vw,120px);
  border-top:1px solid rgba(57,244,212,.16);
  background:linear-gradient(180deg,rgba(10,43,45,.34) 0%,var(--sf-night) 46%,#070B14 100%);
}
.sf-footer__glow{height:3px;background:linear-gradient(90deg,var(--sf-cyan),#1E8E86 26%,var(--sf-indigo) 52%,var(--sf-wine) 74%,var(--sf-orange))}
.sf-footer__inner{max-width:1180px;margin:0 auto;padding:clamp(40px,5vw,64px) clamp(18px,4vw,44px) 0}
.sf-footer__grid{display:grid;grid-template-columns:1.5fr .8fr .8fr 1.3fr;gap:clamp(26px,3.6vw,44px)}
.sf-footer__eyebrow{
  font-family:var(--sf-mono);font-size:10.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--sf-cyan);
}
.sf-footer__mark{font-size:clamp(24px,2.6vw,30px);font-weight:900;letter-spacing:.05em;color:var(--sf-pearl);line-height:1.25;margin-top:8px}
.sf-footer__summary{max-width:34ch;margin-top:10px;font-size:14.5px;line-height:1.8;color:var(--sf-text-dim)}
.sf-footer__title{
  font-family:var(--sf-mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:#7C8AA5;margin-bottom:14px;
}
.sf-footer__links{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.sf-footer__link{color:#C3CDDE;text-decoration:none;font-size:14.5px;transition:color .18s var(--sf-ease)}
.sf-footer__link:hover{color:var(--sf-cyan)}
.sf-footer__row{display:grid;grid-template-columns:48px 1fr;gap:10px;align-items:baseline;font-size:14px;margin-bottom:8px}
.sf-footer__label{font-family:var(--sf-mono);font-size:10.5px;letter-spacing:.12em;color:#6B7A94;text-transform:uppercase}
.sf-footer__value{color:#D8E1EE;word-break:break-word}
.sf-copy{
  display:inline-flex;align-items:center;gap:6px;margin:2px 0 14px;
  padding:7px 14px;border-radius:2px;cursor:pointer;
  font-family:var(--sf-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--sf-cyan);background:rgba(57,244,212,.08);
  border:1px solid rgba(57,244,212,.4);
  transition:background-color .18s var(--sf-ease),color .18s var(--sf-ease);
}
.sf-copy:hover{background:rgba(57,244,212,.18)}
.sf-copy[data-copied]{background:var(--sf-cyan);color:#04211C;border-color:var(--sf-cyan)}
.sf-footer__note{max-width:40ch;margin-top:14px;font-size:12.5px;line-height:1.7;color:#7C8AA5}
.sf-footer__bottom{
  display:flex;flex-wrap:wrap;gap:10px 22px;justify-content:space-between;align-items:center;
  margin-top:clamp(30px,4vw,48px);padding:20px 0 26px;
  border-top:1px solid rgba(38,48,67,.7);
  font-family:var(--sf-mono);font-size:11.5px;letter-spacing:.1em;color:#6B7A94;
}
.sf-footer__legal,.sf-footer__copyright{margin:0}

/* ---------- shared page components ---------- */
.sf-container{width:100%;max-width:1180px;margin:0 auto;padding:0 clamp(18px,4vw,44px)}
.sf-section{position:relative;padding:clamp(52px,7vw,96px) 0}
.sf-section__head{
  display:grid;grid-template-columns:auto 1fr;align-items:baseline;gap:18px;
  padding-bottom:16px;margin-bottom:28px;border-bottom:var(--sf-line-soft);
}
.sf-section__num{font-family:var(--sf-serif);font-size:14px;letter-spacing:.18em;color:var(--sf-cyan)}
.sf-section__title{font-size:clamp(23px,3vw,34px);font-weight:800;letter-spacing:-.01em;line-height:1.3}
.sf-eyebrow{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:12px;
  font-family:var(--sf-mono);font-size:11.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--sf-cyan);
}
.sf-eyebrow::before{content:"";width:22px;height:1px;background:var(--sf-cyan)}
.sf-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border:1px solid transparent;border-radius:2px;
  font-size:14.5px;font-weight:700;letter-spacing:.04em;text-decoration:none;cursor:pointer;
  transition:background-color .18s var(--sf-ease),color .18s var(--sf-ease),border-color .18s var(--sf-ease);
}
.sf-btn--accent{background:var(--sf-orange);color:#1A0900}
.sf-btn--accent:hover{background:#FF9457}
.sf-btn--ghost{background:transparent;color:var(--sf-cyan);border-color:rgba(57,244,212,.45)}
.sf-btn--ghost:hover{background:rgba(57,244,212,.12)}
.sf-btn--line{background:rgba(246,241,231,.04);color:var(--sf-text);border-color:var(--sf-steel)}
.sf-btn--line:hover{border-color:var(--sf-cyan);color:var(--sf-cyan)}
.sf-crumbs{
  display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0 0 26px;padding:0;
  font-family:var(--sf-mono);font-size:11.5px;letter-spacing:.12em;color:#7D8BA6;
}
.sf-crumbs li{list-style:none}
.sf-crumbs li+li::before{content:"/";margin-right:8px;color:#3C4A61}
.sf-crumbs a{color:#A9B6CC;text-decoration:none}
.sf-crumbs a:hover{color:var(--sf-cyan)}
.sf-grid{display:grid;gap:clamp(16px,2vw,26px);grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.sf-card{
  position:relative;overflow:hidden;padding:22px;border-radius:3px;
  border:1px solid var(--sf-steel);
  background:linear-gradient(180deg,rgba(10,43,45,.55) 0%,rgba(6,10,19,.92) 100%);
  box-shadow:var(--sf-shadow);
  transition:border-color .2s var(--sf-ease),transform .2s var(--sf-ease);
}
.sf-card:hover{border-color:rgba(57,244,212,.42);transform:translateY(-2px)}
.sf-card__meta{font-family:var(--sf-mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--sf-amber);margin-bottom:8px}
.sf-stat{display:grid;gap:2px;padding:16px 18px;border:1px solid var(--sf-steel);border-radius:2px;background:rgba(24,19,56,.45)}
.sf-stat__num{font-family:var(--sf-mono);font-size:clamp(28px,3.4vw,40px);font-weight:700;line-height:1.05;letter-spacing:-.02em;color:var(--sf-cyan)}
.sf-stat__label{font-family:var(--sf-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#8B99B3}
.sf-tag{
  display:inline-block;padding:3px 9px;border-radius:999px;
  font-family:var(--sf-mono);font-size:11px;letter-spacing:.1em;
  color:var(--sf-amber);background:rgba(255,200,87,.07);border:1px solid rgba(255,200,87,.35);
}
.sf-media{
  position:relative;overflow:hidden;aspect-ratio:16/9;border-radius:3px;
  border:1px solid var(--sf-steel);
  background:
    radial-gradient(circle at 28% 18%,rgba(57,244,212,.2),transparent 62%),
    linear-gradient(135deg,var(--sf-teal) 0%,var(--sf-indigo) 62%,var(--sf-night) 100%);
}
.sf-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(57,244,212,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(57,244,212,.08) 1px,transparent 1px);
  background-size:32px 32px;opacity:.7;
}
.sf-media--wide{aspect-ratio:21/9}
.sf-media--tall{aspect-ratio:4/5}
.sf-media__img{position:relative;z-index:1;display:block;width:100%;height:100%;object-fit:cover}
.sf-prose{max-width:72ch;font-size:17px;line-height:1.85;color:#CBD5E4}
.sf-prose p{margin:0 0 1.15em}
.sf-prose h2{font-size:clamp(21px,2.4vw,26px);font-weight:800;margin:1.8em 0 .6em;color:var(--sf-pearl)}
.sf-prose h3{font-size:18px;font-weight:700;margin:1.6em 0 .5em;color:var(--sf-pearl)}
.sf-prose ul,.sf-prose ol{margin:0 0 1.15em;padding-left:1.35em}
.sf-prose li{margin-bottom:.45em}
.sf-prose a{color:var(--sf-cyan);text-underline-offset:3px}
.sf-prose strong{color:#fff}
.sf-paper{background:var(--sf-pearl);color:var(--sf-ink);border-radius:3px;padding:clamp(24px,4vw,52px)}
.sf-paper .sf-prose{color:#2A3140}
.sf-paper .sf-prose h2,.sf-paper .sf-prose h3{color:var(--sf-ink)}
.sf-paper .sf-prose strong{color:#000}
.sf-paper .sf-prose a{color:#0B6E63}
.sf-paper .sf-eyebrow{color:#0B6E63}
.sf-paper .sf-eyebrow::before{background:#0B6E63}
.sf-divider{height:1px;border:0;margin:clamp(32px,4vw,56px) 0;background:linear-gradient(90deg,transparent,var(--sf-steel),transparent)}
.sf-reveal{opacity:0;transform:translateY(14px);transition:opacity .55s var(--sf-ease),transform .55s var(--sf-ease)}
.sf-reveal.is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (min-width:1024px){
  body{padding-left:var(--sf-rail-w)}
}
@media (max-width:1023px){
  body{padding-top:62px;padding-left:0}
  body.is-nav-open{overflow:hidden}
  .sf-header{
    top:0;bottom:auto;left:0;right:0;width:auto;display:block;
    border-right:0;background:transparent;
  }
  .sf-topbar{
    display:flex;align-items:center;gap:12px;min-height:62px;
    padding:10px clamp(14px,4vw,22px);
    background:rgba(7,12,23,.96);
    border-bottom:var(--sf-line);
  }
  .sf-rail{
    position:fixed;top:62px;left:0;right:0;z-index:95;
    max-height:calc(100vh - 62px);overflow-y:auto;
    padding:20px clamp(14px,4vw,22px) 28px;
    background:#070C17;border-bottom:var(--sf-line);
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);
    transition:opacity .22s var(--sf-ease),transform .22s var(--sf-ease),visibility .22s;
  }
  .sf-header[data-open] .sf-rail{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .sf-nav{flex:0 0 auto}
  .sf-rail__foot{margin-top:22px}
  .sf-to-top{right:16px;bottom:16px}
  .sf-footer__grid{grid-template-columns:1fr 1fr}
  .sf-footer__brand{grid-column:1/-1}
}
@media (max-width:700px){
  .sf-footer__grid{grid-template-columns:1fr;gap:30px}
  .sf-footer__bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .sf-nav__link{font-size:15px;padding:12px 10px 12px 12px}
}

/* ---------- print ---------- */
@media print{
  body{padding:0 !important;background:#fff;color:#000}
  body::before{display:none}
  .sf-header,.sf-to-top,.sf-progress,.sf-skip,.sf-copy{display:none !important}
  .sf-footer{margin-top:24px;border-top:1px solid #999;background:#fff;color:#000}
  .sf-footer__glow{display:none}
  .sf-footer__mark,.sf-footer__link,.sf-footer__value{color:#000}
}

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