:root{
  --color-night:#0A1E3C;
  --color-night-2:#0D2A4A;
  --color-night-3:#0E3458;
  --color-beta:#FF6B00;
  --color-cyan:#00C2D1;
  --color-good:#7ED957;
  --color-warn:#FFC24B;
  --color-text:#F5F7FA;
  --color-muted:#A3B8CC;
  --color-border:#24466B;
  --font-display:'Impact','Arial Black','Noto Sans SC','Microsoft YaHei',sans-serif;
  --font-body:'Noto Sans SC','Microsoft YaHei',sans-serif;
  --font-mono:'Roboto Mono','Consolas','SFMono-Regular',monospace;
  --content-max:1280px;
  --ease-power:cubic-bezier(.22,.8,.24,1);
  --header-z:1200;
  --radius:6px;
}

*,*::before,*::after{
  box-sizing:border-box;
  margin:0;
  padding:0;
}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  background:
    radial-gradient(1100px 520px at 88% -5%,rgba(0,194,209,.10),transparent 62%),
    radial-gradient(900px 500px at 4% 0%,rgba(255,107,0,.06),transparent 55%),
    var(--color-night);
  color:var(--color-text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  min-height:100vh;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
}

img,svg,video{
  display:block;
  max-width:100%;
  height:auto;
}

ul,ol{
  list-style:none;
}

a{
  color:inherit;
  text-decoration:none;
}

button{
  font:inherit;
  color:inherit;
  background:none;
  border:0;
  cursor:pointer;
}

::selection{
  background:var(--color-beta);
  color:var(--color-night);
}

:focus-visible{
  outline:3px solid var(--color-cyan);
  outline-offset:3px;
  border-radius:4px;
}

.container{
  width:min(var(--content-max),92vw);
  margin-inline:auto;
}

.visually-hidden{
  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{
  position:fixed;
  top:12px;
  left:12px;
  z-index:3000;
  background:var(--color-beta);
  color:var(--color-night);
  font-weight:800;
  font-size:14px;
  padding:10px 18px;
  border-radius:4px;
  transform:translateY(-160%);
  transition:transform .3s var(--ease-power);
  box-shadow:0 8px 24px rgba(255,107,0,.4);
}

.skip-link:focus{
  transform:translateY(0);
}

.mono{
  font-family:var(--font-mono);
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:var(--color-beta);
  color:var(--color-night);
  font-weight:800;
  font-size:14px;
  letter-spacing:.04em;
  line-height:1;
  padding:11px 18px;
  border-radius:4px;
  transition:transform .25s var(--ease-power),box-shadow .25s var(--ease-power),background .25s;
  clip-path:polygon(10px 0,100% 0,calc(100% - 10px) 100%,0 100%);
}

.btn:hover{
  transform:translateY(-2px);
  box-shadow:0 10px 28px rgba(255,107,0,.35);
}

.btn:active{
  transform:translateY(0);
}

.btn-ghost{
  background:transparent;
  color:var(--color-text);
  border:1px solid var(--color-border);
  clip-path:none;
}

.btn-ghost:hover{
  border-color:var(--color-beta);
  color:var(--color-beta);
  box-shadow:none;
}

.btn-dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--color-cyan);
  box-shadow:0 0 0 0 rgba(0,194,209,.5);
  animation:pulse-dot 2s infinite;
}

@keyframes pulse-dot{
  0%{box-shadow:0 0 0 0 rgba(0,194,209,.5)}
  70%{box-shadow:0 0 0 8px rgba(0,194,209,0)}
  100%{box-shadow:0 0 0 0 rgba(0,194,209,0)}
}

.page-section{
  padding:84px 0;
  position:relative;
}

.section-kicker{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.32em;
  text-transform:uppercase;
  color:var(--color-cyan);
  display:block;
  margin-bottom:10px;
}

.section-title{
  font-family:var(--font-display);
  font-size:clamp(30px,4.6vw,52px);
  line-height:1.06;
  letter-spacing:.02em;
  text-transform:uppercase;
  color:var(--color-text);
}

.section-intro{
  color:var(--color-muted);
  max-width:58ch;
  margin-top:14px;
  font-size:16px;
}

.grid{
  display:grid;
  gap:24px;
}

.grid-2{
  grid-template-columns:repeat(2,minmax(0,1fr));
}

.grid-3{
  grid-template-columns:repeat(3,minmax(0,1fr));
}

.grid-4{
  grid-template-columns:repeat(4,minmax(0,1fr));
}

.card{
  background:linear-gradient(180deg,rgba(13,42,74,.78),rgba(10,30,60,.92));
  border:1px solid var(--color-border);
  border-radius:var(--radius);
  padding:26px 24px;
  position:relative;
  overflow:hidden;
  transition:border-color .3s,transform .3s var(--ease-power),box-shadow .3s;
}

.card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:3px;
  height:100%;
  background:linear-gradient(180deg,var(--color-beta),var(--color-cyan));
  opacity:0;
  transition:opacity .3s;
}

.card:hover{
  border-color:rgba(255,107,0,.55);
  transform:translateY(-5px);
  box-shadow:0 20px 42px rgba(0,0,0,.28);
}

.card:hover::before{
  opacity:1;
}

.stat-number{
  font-family:var(--font-mono);
  font-size:42px;
  line-height:1.1;
  color:var(--color-cyan);
  font-weight:700;
}

.stat-cap{
  color:var(--color-muted);
  font-size:13px;
  letter-spacing:.08em;
  margin-top:6px;
}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding:22px 0 10px;
  font-size:13px;
  color:var(--color-muted);
}

.breadcrumb-item a{
  color:var(--color-muted);
  transition:color .2s;
}

.breadcrumb-item a:hover{
  color:var(--color-beta);
}

.breadcrumb-item[aria-current="page"]{
  color:var(--color-text);
}

.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  margin-right:6px;
  color:var(--color-border);
}

.chapter-toc{
  position:sticky;
  top:150px;
  padding:6px 0;
}

.chapter-toc-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 2px;
  color:var(--color-muted);
  border-bottom:1px dashed var(--color-border);
  font-size:14px;
  transition:color .2s,padding-left .2s;
}

.chapter-toc-link:hover,
.chapter-toc-link[aria-current="true"]{
  color:var(--color-beta);
  padding-left:8px;
}

.media-frame{
  position:relative;
  border:1px solid var(--color-border);
  border-radius:var(--radius);
  overflow:hidden;
  aspect-ratio:4/3;
  background:
    linear-gradient(135deg,rgba(255,107,0,.07),rgba(0,194,209,.10)),
    repeating-linear-gradient(-45deg,rgba(255,255,255,.025) 0 8px,transparent 8px 16px);
}

.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(110deg,transparent 32%,rgba(255,255,255,.05) 48%,transparent 62%);
  transform:translateX(-100%);
  transition:transform .8s var(--ease-power);
}

.media-frame:hover::after{
  transform:translateX(100%);
}

.media-frame--wide{
  aspect-ratio:16/7;
}

.media-frame--tall{
  aspect-ratio:3/4;
}

.media-frame--hero{
  aspect-ratio:16/9;
}

.media-label{
  position:absolute;
  left:14px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--color-cyan);
  text-transform:uppercase;
  background:rgba(10,30,60,.72);
  padding:4px 9px;
  border-radius:4px;
}

.page-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:4000;
  width:100%;
  height:3px;
  background:linear-gradient(90deg,var(--color-beta),var(--color-cyan));
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

.to-top{
  position:fixed;
  bottom:28px;
  right:28px;
  z-index:2200;
  width:48px;
  height:48px;
  display:grid;
  place-items:center;
  background:var(--color-beta);
  color:var(--color-night);
  border-radius:8px;
  box-shadow:0 14px 32px rgba(255,107,0,.35);
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  transition:opacity .3s,transform .3s var(--ease-power),visibility .3s,background .2s;
}

.to-top::before{
  content:"↑";
  font-size:22px;
  font-weight:900;
  line-height:1;
}

.to-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.to-top:hover{
  background:#fff;
  color:var(--color-night);
}

[data-scroll-reveal]{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .8s var(--ease-power),transform .8s var(--ease-power);
}

[data-scroll-reveal].is-visible{
  opacity:1;
  transform:none;
}

.site-header{
  position:sticky;
  top:0;
  z-index:var(--header-z);
  background:rgba(10,30,60,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--color-border);
}

.site-header::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:linear-gradient(90deg,transparent,var(--color-beta) 20%,var(--color-cyan) 80%,transparent);
  z-index:2;
}

.site-header::after{
  content:"";
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(115deg,transparent 0 22px,rgba(255,255,255,.018) 22px 23px);
  pointer-events:none;
  z-index:0;
}

.header-bar{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding-top:18px;
  padding-bottom:14px;
}

.brand-lockup{
  display:inline-flex;
  align-items:center;
  gap:14px;
}

.brand-emblem{
  position:relative;
  width:42px;
  height:42px;
  flex:0 0 42px;
  border-radius:8px;
  background:linear-gradient(145deg,var(--color-night-2),var(--color-night-3));
  border:1px solid var(--color-border);
  overflow:hidden;
}

.brand-emblem-line{
  position:absolute;
  left:9px;
  right:9px;
  top:19px;
  height:2px;
  background:var(--color-beta);
  transform:rotate(-40deg);
}

.brand-emblem-line::after{
  content:"";
  position:absolute;
  top:0;
  right:0;
  width:18px;
  height:2px;
  background:var(--color-cyan);
  transform:translateX(55%);
}

.brand-emblem-dot{
  position:absolute;
  left:8px;
  bottom:7px;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--color-warn);
}

.brand-text{
  display:flex;
  flex-direction:column;
  gap:2px;
}

.brand-name{
  font-family:var(--font-display);
  font-size:24px;
  line-height:1.05;
  letter-spacing:.04em;
  color:#fff;
  text-transform:uppercase;
}

.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.3em;
  color:var(--color-muted);
  text-transform:uppercase;
}

.header-meta{
  display:flex;
  align-items:center;
  gap:18px;
  flex-wrap:wrap;
  justify-content:flex-end;
}

.status-badge{
  background:linear-gradient(135deg,var(--color-beta),#FF9142);
  color:var(--color-night);
  font-weight:900;
  font-size:12px;
  letter-spacing:.12em;
  padding:5px 10px;
  border-radius:4px;
  clip-path:polygon(6px 0,100% 0,calc(100% - 6px) 100%,0 100%);
  text-transform:uppercase;
}

.header-countdown{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--color-warn);
}

.countdown-label{
  font-family:var(--font-body);
  color:var(--color-muted);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
}

.countdown-value{
  font-weight:700;
  white-space:nowrap;
}

.nav-wrap{
  position:relative;
  z-index:1;
  border-top:1px solid var(--color-border);
  background:linear-gradient(180deg,rgba(13,42,74,.55),rgba(10,30,60,.35));
}

.main-nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:54px;
}

.main-nav-list{
  display:flex;
  align-items:center;
  gap:30px;
}

.nav-link{
  position:relative;
  display:inline-block;
  padding:16px 2px 12px;
  font-size:15px;
  font-weight:700;
  letter-spacing:.05em;
  color:var(--color-text);
  transition:color .2s;
}

.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:6px;
  width:0;
  height:3px;
  background:var(--color-beta);
  transition:width .3s var(--ease-power);
}

.nav-link:hover{
  color:#fff;
}

.nav-link:hover::after{
  width:100%;
}

.nav-link[aria-current="page"]{
  color:var(--color-beta);
}

.nav-link[aria-current="page"]::after{
  width:100%;
  background:var(--color-cyan);
}

.header-cta{
  display:flex;
  align-items:center;
  gap:12px;
}

.nav-toggle{
  display:none;
  position:relative;
  width:42px;
  height:42px;
  border:1px solid var(--color-border);
  border-radius:6px;
  align-items:center;
  justify-content:center;
}

.nav-toggle-line,
.nav-toggle-line::before,
.nav-toggle-line::after{
  content:"";
  position:absolute;
  left:10px;
  width:20px;
  height:2px;
  background:var(--color-text);
  transition:transform .3s var(--ease-power),background .3s,top .3s var(--ease-power);
}

.nav-toggle-line{
  top:19px;
}

.nav-toggle-line::before{
  top:-6px;
}

.nav-toggle-line::after{
  top:6px;
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line{
  background:transparent;
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line::before{
  top:0;
  transform:rotate(45deg);
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line::after{
  top:0;
  transform:rotate(-45deg);
}

.site-footer{
  position:relative;
  margin-top:90px;
  background:linear-gradient(180deg,var(--color-night),#071426 130%);
  border-top:1px solid var(--color-border);
  overflow:hidden;
}

.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:1px;
  background:linear-gradient(90deg,var(--color-beta),var(--color-cyan),transparent 90%);
}

.footer-signal{
  border-bottom:1px solid var(--color-border);
  background:
    linear-gradient(180deg,rgba(0,194,209,.03),transparent),
    repeating-linear-gradient(115deg,transparent 0 30px,rgba(255,255,255,.012) 30px 31px);
}

.footer-signal .container{
  display:flex;
  align-items:flex-end;
  gap:22px;
  height:76px;
  padding-top:12px;
}

.sig{
  flex:1;
  max-width:30px;
  border-radius:5px 5px 0 0;
  background:linear-gradient(180deg,var(--color-cyan),rgba(0,194,209,.08) 160%);
  opacity:.7;
}

.sig-1{height:34px}
.sig-2{height:56px}
.sig-3{height:42px}
.sig-4{height:66px}
.sig-5{height:48px}
.sig-6{height:26px}
.sig-7{height:58px}
.sig-8{height:36px}

.footer-grid{
  display:grid;
  grid-template-columns:1.8fr 1fr 1fr 1.2fr;
  gap:44px;
  padding:54px 0 44px;
}

.footer-brand .brand-name{
  font-size:28px;
  display:block;
  margin-bottom:14px;
}

.footer-trust{
  color:var(--color-muted);
  font-size:14px;
  line-height:1.9;
  max-width:36ch;
}

.footer-title{
  font-family:var(--font-display);
  font-size:16px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:#fff;
  margin-bottom:14px;
}

.footer-col ul{
  display:flex;
  flex-direction:column;
  gap:9px;
}

.footer-link{
  color:var(--color-muted);
  font-size:14px;
  transition:color .2s,padding-left .2s;
}

.footer-link:hover{
  color:var(--color-beta);
  padding-left:4px;
}

.footer-contact li{
  color:var(--color-muted);
  font-size:13px;
  font-family:var(--font-mono);
  letter-spacing:.02em;
  line-height:1.8;
}

.footer-contact a{
  font-family:var(--font-body);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  border-top:1px solid var(--color-border);
  padding:18px 0 22px;
  color:var(--color-muted);
  font-size:12px;
  font-family:var(--font-mono);
  letter-spacing:.04em;
}

@media (max-width:1024px){
  .grid-4{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }

  .grid-3{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }

  .footer-grid{
    grid-template-columns:1fr 1fr;
    gap:38px 30px;
  }
}

@media (max-width:960px){
  .main-nav{
    flex-wrap:wrap;
    min-height:46px;
  }

  .main-nav-list,
  .header-cta{
    display:none;
    width:100%;
  }

  .main-nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    padding:6px 0 0;
  }

  .main-nav-list li{
    border-bottom:1px solid rgba(36,70,107,.7);
  }

  .nav-link{
    display:block;
    padding:12px 2px;
    width:100%;
    font-size:16px;
  }

  .nav-link::after{
    bottom:2px;
    height:2px;
  }

  .header-cta{
    flex-wrap:wrap;
    gap:10px;
    padding:14px 0 2px;
  }

  .nav-toggle{
    display:grid;
    margin-left:auto;
  }

  .main-nav[data-open="true"]{
    flex-direction:column;
    align-items:stretch;
    padding-bottom:16px;
  }

  .main-nav[data-open="true"] .main-nav-list,
  .main-nav[data-open="true"] .header-cta{
    display:flex;
  }
}

@media (max-width:720px){
  .header-bar{
    flex-direction:column;
    align-items:flex-start;
    gap:12px;
    padding-top:14px;
    padding-bottom:12px;
  }

  .header-meta{
    justify-content:flex-start;
  }

  .status-badge{
    font-size:11px;
  }

  .header-countdown{
    font-size:11px;
  }

  .brand-name{
    font-size:21px;
  }

  .brand-emblem{
    width:36px;
    height:36px;
    flex-basis:36px;
  }

  .grid-2,
  .grid-3,
  .grid-4{
    grid-template-columns:1fr;
  }

  .page-section{
    padding:58px 0;
  }

  .footer-grid{
    grid-template-columns:1fr;
    padding-top:38px;
  }

  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
  }

  .to-top{
    bottom:18px;
    right:18px;
    width:42px;
    height:42px;
  }
}

@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001s !important;
    animation-iteration-count:1 !important;
    transition-duration:.001s !important;
    scroll-behavior:auto !important;
  }

  [data-scroll-reveal]{
    opacity:1;
    transform:none;
    transition:none;
  }

  .btn{
    transition:none;
  }

  .card{
    transition:none;
  }

  .to-top{
    transition:none;
  }
}