*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,picture,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

:root{
  --bg:#06101F;
  --panel:#0C1B30;
  --line:#17304D;
  --cyan:#38F2D0;
  --cyan-soft:#9FF6E6;
  --amber:#FFB03A;
  --ink:#E8F1F8;
  --ink-dim:#8FA3B8;
  --teal-deep:#0E3B3A;
  --tactic:#3A6EA5;

  --rail-w:88px;
  --shell:1180px;
  --r-panel:22px;
  --r-pill:999px;
  --pad-x:clamp(18px,4vw,48px);
  --gap:clamp(16px,2.4vw,28px);

  --font-display:"HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --dur:240ms;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html{background:var(--bg)}
body{
  font-family:var(--font-body);
  font-size:16.5px;
  font-weight:400;
  line-height:1.85;
  color:var(--ink);
  background-color:var(--bg);
  background-image:
    linear-gradient(to right,rgba(58,110,165,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(58,110,165,.055) 1px,transparent 1px);
  background-size:132px 132px;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(56,242,208,.3);color:#03130F}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

h1,h2,h3,h4{font-weight:300;letter-spacing:-.02em;line-height:1.12;color:var(--ink)}
p{max-width:70ch}
strong{font-weight:600;color:var(--ink)}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad-x)}
.band{border-top:1px solid var(--line)}
.kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.display{
  font-size:clamp(2.8rem,6vw,5.6rem);
  font-weight:300;
  letter-spacing:-.02em;
  line-height:.98;
  color:var(--ink);
}
.lead{font-size:clamp(16px,1.6vw,18px);line-height:1.8;color:var(--ink-dim)}
.prose p{font-size:16.5px;line-height:1.85;color:var(--ink-dim)}
.prose p+p{margin-top:1.2em}
.prose h3{margin-top:1.6em;margin-bottom:.6em;font-size:clamp(20px,2.2vw,26px)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:14px;letter-spacing:.04em;line-height:1.4;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn-primary{background:var(--cyan);color:#04140F;font-weight:600}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 30px rgba(56,242,208,.22)}
.btn-ghost{background:rgba(12,27,48,.55);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan-soft);transform:translateY(-1px)}
.btn-amber{background:var(--amber);color:#1B1101;font-weight:600}
.btn-amber:hover{transform:translateY(-1px);box-shadow:0 12px 30px rgba(255,176,58,.22)}

.crumbs{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--ink-dim)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";color:var(--line)}
.crumbs a{transition:color var(--dur) var(--ease)}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--ink)}

.grid{display:grid;gap:var(--gap)}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}

.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-panel);padding:clamp(18px,2.4vw,28px)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat-value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(28px,3.4vw,44px);line-height:1;color:var(--amber)}
.stat-label{font-size:12px;letter-spacing:.08em;color:var(--ink-dim)}

.media{
  position:relative;overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-panel);
  aspect-ratio:16/9;
  background:
    radial-gradient(70% 70% at 18% 12%,rgba(56,242,208,.14),transparent 62%),
    linear-gradient(150deg,#10263F 0%,#0A1727 58%,#0C1B30 100%);
}
.media::after{
  content:"";position:absolute;inset:12px;pointer-events:none;
  border:1px dashed rgba(56,242,208,.2);
  border-radius:calc(var(--r-panel) - 8px);
}
.media.has-media::after{content:none}
.media>img{width:100%;height:100%;object-fit:cover}
.media-cap{margin-top:10px;font-size:12.5px;line-height:1.7;color:var(--ink-dim)}
.media-tag{
  position:absolute;left:12px;bottom:12px;z-index:2;
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  background:rgba(6,16,31,.82);border:1px solid rgba(56,242,208,.35);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:var(--cyan-soft);
}
.ratio-16x9{aspect-ratio:16/9}
.ratio-4x3{aspect-ratio:4/3}
.ratio-1x1{aspect-ratio:1/1}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-dim);
}
.tag-cyan{color:var(--cyan);border-color:rgba(56,242,208,.35);background:rgba(56,242,208,.07)}
.tag-amber{color:var(--amber);border-color:rgba(255,176,58,.4);background:rgba(255,176,58,.08)}

.scroller{
  display:flex;gap:var(--gap);
  overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:14px;
  scrollbar-color:var(--line) transparent;
}
.scroller>*{flex:0 0 auto;scroll-snap-align:start}
.hairline-slant{
  height:1px;border:0;margin:0;
  background:linear-gradient(90deg,transparent,var(--line) 18%,rgba(56,242,208,.55) 50%,var(--line) 82%,transparent);
  transform:rotate(-.6deg);transform-origin:center;
}

.acc{display:flex;flex-direction:column;gap:10px}
.acc-item{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r-panel);
  padding:0 clamp(16px,2.2vw,22px);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.acc-item::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:2px;
  border-radius:2px;background:transparent;
  transition:background var(--dur) var(--ease);
}
.acc-item[data-open]{border-color:rgba(56,242,208,.32);background:#0D2036}
.acc-item[data-open]::before{background:var(--cyan)}
.acc-btn{
  display:flex;align-items:center;gap:14px;width:100%;
  padding:18px 0;text-align:left;
  font-size:16px;line-height:1.6;color:var(--ink);
  transition:color var(--dur) var(--ease);
}
.acc-btn:hover{color:var(--cyan-soft)}
.acc-idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--ink-dim)}
.acc-item[data-open] .acc-idx{color:var(--cyan)}
.acc-title{flex:1}
.acc-arrow{
  flex:0 0 auto;width:9px;height:9px;margin-right:4px;
  border-right:1.5px solid var(--cyan);border-bottom:1.5px solid var(--cyan);
  transform:rotate(45deg);
  transition:transform var(--dur) var(--ease);
}
.acc-item[data-open] .acc-arrow{transform:rotate(-135deg)}
.acc-panel{
  display:grid;grid-template-rows:0fr;
  visibility:hidden;
  transition:grid-template-rows var(--dur) var(--ease),visibility var(--dur) var(--ease);
}
.acc-item[data-open] .acc-panel{grid-template-rows:1fr;visibility:visible}
.acc-body{overflow:hidden}
.acc-body p{padding-bottom:18px;font-size:15px;line-height:1.85;color:var(--ink-dim)}

html.reveal-on [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
html.reveal-on [data-reveal].is-in{opacity:1;transform:none}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:300;
  display:flex;
}
.rail{
  display:flex;flex-direction:column;
  width:100%;
  padding:18px 10px 16px;
  gap:22px;
  overflow-y:auto;
  scrollbar-width:none;
  background:rgba(6,16,31,.42);
  border-right:1px solid transparent;
  backdrop-filter:blur(4px);
  -webkit-backdrop-filter:blur(4px);
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),padding var(--dur) var(--ease);
}
.rail::-webkit-scrollbar{width:0;height:0}
.site-header[data-scrolled] .rail{
  background:rgba(6,16,31,.96);
  border-right-color:var(--line);
  padding-top:14px;padding-bottom:14px;
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.rail-head{display:flex;flex-direction:column;align-items:center;gap:14px}
.brand{display:flex;flex-direction:column;align-items:center;gap:9px;padding:4px 0}
.brand-glyph{
  display:flex;flex-direction:column;justify-content:center;gap:3px;
  width:30px;height:30px;padding:7px 6px;
  border:1px solid var(--line);border-radius:10px;
  background:rgba(56,242,208,.06);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.brand-glyph i{display:block;height:2px;border-radius:2px;background:var(--cyan)}
.brand-glyph i:nth-child(1){width:60%}
.brand-glyph i:nth-child(2){width:100%}
.brand-glyph i:nth-child(3){width:35%;background:var(--amber)}
.brand:hover .brand-glyph{border-color:var(--cyan);background:rgba(56,242,208,.14)}
.brand-words{display:flex;flex-direction:column;align-items:center;gap:3px}
.brand-name{font-size:13px;letter-spacing:.12em;line-height:1.2;color:var(--ink)}
.brand-latin{font-family:var(--font-mono);font-size:8px;letter-spacing:.34em;text-transform:uppercase;color:var(--ink-dim)}

.nav-toggle{display:none}
.nav-toggle-box{display:flex;flex-direction:column;gap:4px;width:14px}
.nav-toggle-box span{display:block;height:1px;background:currentColor;transition:transform var(--dur) var(--ease)}
.nav-toggle-text{font-size:11px;letter-spacing:.18em}

.rail-panel{display:contents}

.site-nav{width:100%}
.nav-kicker{
  font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ink-dim);opacity:.72;
  padding:0 0 10px 2px;
}
.nav-list{display:flex;flex-direction:column;gap:2px;width:100%}
.nav-link{
  display:flex;flex-direction:column;gap:2px;
  padding:7px 6px 7px 9px;
  border-left:1px solid transparent;
  border-radius:0 8px 8px 0;
  color:var(--ink-dim);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-num{font-family:var(--font-mono);font-size:8px;letter-spacing:.18em;opacity:.75;color:var(--ink-dim)}
.nav-text{font-size:11px;letter-spacing:.05em;line-height:1.55}
.nav-link:hover{color:var(--ink);border-left-color:rgba(56,242,208,.5);background:rgba(56,242,208,.05)}
.nav-link[aria-current="page"]{
  color:var(--cyan-soft);
  border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(56,242,208,.16),rgba(56,242,208,0));
}
.nav-link[aria-current="page"] .nav-num{color:var(--cyan);opacity:1}

.rail-foot{margin-top:auto;display:flex;flex-direction:column;align-items:center;gap:10px;width:100%}
.rail-cta{
  display:block;width:100%;text-align:center;
  padding:9px 8px;border-radius:var(--r-pill);
  background:var(--cyan);color:#04140F;
  font-size:11px;line-height:1.45;letter-spacing:.04em;font-weight:600;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.rail-cta:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(56,242,208,.24)}
.rail-meta{font-size:9px;letter-spacing:.2em;color:var(--ink-dim);opacity:.72}

.skip-link{
  position:fixed;top:8px;left:calc(var(--rail-w) + 12px);z-index:400;
  padding:10px 18px;border-radius:var(--r-pill);
  background:var(--cyan);color:#04140F;
  font-size:13px;font-weight:600;letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  background:
    radial-gradient(120% 90% at 8% 0%,rgba(14,59,58,.6) 0%,rgba(6,16,31,0) 62%),
    linear-gradient(180deg,#08182B 0%,#06101F 64%);
  color:var(--ink-dim);
}
.footer-rule{
  height:8px;
  border-top:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,rgba(56,242,208,.5) 0 1px,transparent 1px 44px);
  opacity:.6;
}
.footer-inner{
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--pad-x) clamp(28px,4vw,44px);
  display:grid;grid-template-columns:minmax(240px,1fr) minmax(0,1.85fr);
  gap:clamp(32px,5vw,72px);
  align-items:start;
}
.footer-lead .btn{margin-top:22px}
.footer-kicker{font-family:var(--font-mono);font-size:10px;letter-spacing:.26em;text-transform:uppercase;color:var(--cyan)}
.footer-brand{margin-top:14px;font-size:clamp(28px,3.6vw,40px);font-weight:300;letter-spacing:-.02em;line-height:1.1;color:var(--ink)}
.footer-line{margin-top:12px;font-size:14px;line-height:1.85;max-width:34ch}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr)) minmax(0,1.35fr);
  gap:clamp(20px,2.6vw,36px);
}
.footer-col-title{
  display:flex;align-items:center;gap:8px;
  margin-bottom:16px;
  font-size:11px;letter-spacing:.2em;font-weight:400;color:var(--ink);
}
.footer-col-title::before{content:"";width:14px;height:1px;background:var(--cyan)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:var(--ink-dim);transition:color var(--dur) var(--ease)}
.footer-links a:hover{color:var(--cyan)}
.footer-contact-list{display:flex;flex-direction:column;gap:14px}
.footer-contact-item{display:flex;flex-direction:column;gap:2px}
.footer-contact-label{font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-dim);opacity:.72}
.footer-contact-value{font-size:13.5px;line-height:1.7;color:var(--ink);word-break:break-word}
.footer-note{
  margin-top:16px;padding-left:12px;
  border-left:1px solid var(--line);
  font-size:12px;line-height:1.8;color:var(--ink-dim);opacity:.85;
}
.footer-legal{
  max-width:var(--shell);margin-inline:auto;
  padding:18px var(--pad-x) 26px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  font-size:12px;color:var(--ink-dim);
}
.footer-copy{font-size:12px;letter-spacing:.02em}
.footer-legal-tag{font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;color:var(--ink-dim);opacity:.7}

@media (max-width:1099px){
  .footer-inner{grid-template-columns:1fr;gap:36px}
}
@media (max-width:767px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:479px){
  .footer-grid{grid-template-columns:1fr}
}

/* ---------- mobile header ---------- */
@media (max-width:1023px){
  .site-header{top:0;left:0;right:0;bottom:auto;width:auto;padding:10px 12px}
  .rail{
    width:100%;padding:0;gap:0;overflow:visible;
    background:transparent;border-right:0;
    backdrop-filter:none;-webkit-backdrop-filter:none;
  }
  .site-header[data-scrolled] .rail{background:transparent;border-right:0;padding:0}
  .rail-head{
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:12px;width:100%;height:54px;padding:0 8px 0 12px;
    border:1px solid var(--line);border-radius:var(--r-pill);
    background:rgba(10,24,42,.92);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
  }
  .site-header[data-scrolled] .rail-head{
    background:rgba(6,16,31,.97);
    box-shadow:0 14px 34px rgba(0,0,0,.5);
  }
  .site-header[data-open] .rail-head{border-color:rgba(56,242,208,.4)}
  .brand{flex-direction:row;align-items:center;gap:10px;padding:0}
  .brand-glyph{width:26px;height:26px;padding:6px 5px}
  .brand-words{align-items:flex-start;gap:1px}
  .brand-name{font-size:14px;letter-spacing:.1em}
  .brand-latin{font-size:8px}
  .nav-toggle{
    display:flex;align-items:center;gap:8px;
    padding:8px 14px;border:1px solid var(--line);border-radius:var(--r-pill);
    color:var(--ink-dim);
    transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
  }
  .nav-toggle:hover{color:var(--ink);border-color:rgba(56,242,208,.4)}
  .site-header[data-open] .nav-toggle{color:var(--cyan);border-color:var(--cyan);background:rgba(56,242,208,.08)}
  .site-header[data-open] .nav-toggle-box span:nth-child(1){transform:translateY(2.5px) rotate(45deg)}
  .site-header[data-open] .nav-toggle-box span:nth-child(2){transform:translateY(-2.5px) rotate(-45deg)}

  .rail-panel{
    display:block;width:100%;margin-top:8px;padding-bottom:10px;
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    transition:max-height .3s var(--ease),opacity .2s var(--ease),visibility .3s var(--ease);
  }
  .site-header[data-open] .rail-panel{
    max-height:calc(100vh - 96px);overflow-y:auto;opacity:1;visibility:visible;
  }
  .site-nav{
    padding:12px;border:1px solid var(--line);border-radius:var(--r-panel);
    background:rgba(12,27,48,.97);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  }
  .nav-kicker{padding:2px 0 12px 4px}
  .nav-link{
    flex-direction:row;align-items:baseline;gap:12px;
    padding:12px 10px;border-left:2px solid transparent;border-radius:12px;
  }
  .nav-item+.nav-item .nav-link{border-top:1px solid rgba(23,48,77,.55)}
  .nav-num{font-size:10px}
  .nav-text{font-size:14.5px;letter-spacing:.04em}
  .rail-foot{
    margin-top:10px;flex-direction:row;justify-content:space-between;align-items:center;
    padding:0 4px;
  }
  .rail-cta{width:auto;padding:10px 20px;font-size:12.5px}
  .rail-meta{font-size:10px}
  .skip-link{left:12px;top:74px}
  #main-content{padding-top:74px}
}

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