:root{
  --ink:#0B1F1A;
  --ink-2:#0F2A23;
  --surface:#14352C;
  --line:#1E4A3E;
  --neon:#2FE3A5;
  --neon-soft:#7CF2C4;
  --orange:#FF8A3D;
  --amber:#FFC46B;
  --text:#E8F3EE;
  --text-dim:#9DB8AE;
  --light:#F2F7F4;
  --light-ink:#122720;
  --danger:#E0524C;
  --radius-lg:16px;
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 8px 24px rgba(3,12,9,.45);
  --shell:1280px;
  --pad:clamp(16px,3.2vw,40px);
  --font-sans:"PingFang SC","Noto Sans SC","Source Han Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0}
ul,ol{padding:0;list-style:none}
body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,picture{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line);margin:0}
::selection{background:rgba(47,227,165,.28);color:var(--text)}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:4px}
[id]{scroll-margin-top:150px}

h1,.t-h1{font-size:clamp(2rem,4vw,3.4rem);line-height:1.12;letter-spacing:-.01em;font-weight:800}
h2,.t-h2{font-size:clamp(1.5rem,2.6vw,2.1rem);line-height:1.22;letter-spacing:-.01em;font-weight:800}
h3,.t-h3{font-size:clamp(1.05rem,1.6vw,1.3rem);line-height:1.34;font-weight:700}
h4,.t-h4{font-size:1rem;font-weight:700;letter-spacing:0}
p{max-width:68ch}
small,.t-small{font-size:13px;line-height:1.6;color:var(--text-dim)}

/* ---------- shell & utilities ---------- */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding-inline:var(--pad)}
.page-main{display:block;padding-block:clamp(20px,3.5vw,48px)}
#main-content{display:block}
.skip-link{
  position:absolute;top:0;left:16px;z-index:300;
  transform:translateY(-140%);
  padding:10px 18px;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  background:var(--neon);color:#07231A;font-weight:700;font-size:14px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);outline-offset:0}

.section-label{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--neon);line-height:1.4;
}
.section-label::before{content:"";width:22px;height:1px;background:var(--neon);display:block}
.section-label--dark{color:#0C6B4C}
.section-label--dark::before{background:#0C6B4C}

.layout-split{display:grid;gap:clamp(20px,3vw,40px);grid-template-columns:minmax(0,1fr)}
.rail{min-width:0}
.auto-grid{display:grid;gap:clamp(14px,2vw,22px);grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr))}
.flow > * + *{margin-top:1.1em}

/* ---------- buttons & tags ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:999px;
  border:1px solid var(--line);background:transparent;color:var(--text);
  font-size:15px;font-weight:700;line-height:1.2;letter-spacing:0;
  transition:border-color .2s var(--ease),background-color .2s var(--ease),transform .2s var(--ease),color .2s var(--ease);
}
.btn:hover{border-color:var(--neon);transform:translateY(-2px)}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#22120A}
.btn--accent:hover{background:var(--amber);border-color:var(--amber);color:#22120A}
.btn--ghost{color:var(--neon);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon-soft)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:999px;
  border:1px solid var(--line);background:rgba(30,74,62,.35);
  font-size:12px;font-weight:700;letter-spacing:.06em;color:var(--text-dim);
}
.tag--accent{color:#07231A;background:var(--neon);border-color:var(--neon)}
.tag--alert{color:#2A1109;background:var(--orange);border-color:var(--orange)}
.tag--alert-soft{color:var(--amber);border-color:rgba(255,196,107,.5);background:rgba(255,138,61,.12)}
.tag--danger{color:var(--danger);border-color:rgba(224,82,76,.5);background:rgba(224,82,76,.1)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--ink-2);
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s var(--ease);
}
.site-header[data-stuck]{box-shadow:0 12px 32px rgba(0,0,0,.5)}
.header-upper{background:var(--ink-2)}
.header-upper__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:14px 20px;
  padding-block:13px;
}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand__mark{
  position:relative;flex:none;width:36px;height:36px;border-radius:9px;
  background:var(--neon);
  box-shadow:0 0 0 1px rgba(47,227,165,.35),0 0 18px rgba(47,227,165,.22);
}
.brand__mark::before,.brand__mark::after{
  content:"";position:absolute;top:9px;width:4px;height:18px;background:#07231A;transform:skewX(-12deg);
}
.brand__mark::before{left:11px}
.brand__mark::after{left:20px}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{
  font-size:18px;font-weight:800;letter-spacing:-.01em;line-height:1.2;color:var(--text);
  white-space:nowrap;
}
.brand__claim{
  font-family:var(--font-mono);font-size:11px;line-height:1.5;letter-spacing:.06em;
  color:var(--text-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.header-note{
  display:none;align-items:center;gap:8px;margin:0;
  font-size:13px;color:var(--text-dim);max-width:none;
}
.header-note__dot{
  width:7px;height:7px;border-radius:50%;flex:none;
  background:var(--orange);box-shadow:0 0 0 4px rgba(255,138,61,.14);
}
.header-tools{display:flex;align-items:center;gap:10px}
.chip-link{
  display:none;align-items:center;
  padding:7px 14px;border-radius:999px;
  border:1px solid var(--line);color:var(--text-dim);
  font-size:13px;font-weight:700;letter-spacing:.02em;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.chip-link:hover{color:var(--neon);border-color:var(--neon)}
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 14px;border-radius:999px;
  border:1px solid var(--line);background:rgba(20,53,44,.6);
  color:var(--text);font-size:13px;font-weight:700;letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--neon);color:var(--neon)}
.nav-toggle__bars{display:flex;flex-direction:column;justify-content:space-between;width:16px;height:12px}
.nav-toggle__bars span{display:block;height:2px;width:100%;background:currentColor;border-radius:2px;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

.header-lower{border-top:1px solid var(--line);background:#0C2119}
.primary-nav{display:none;border-top:1px solid var(--line);background:var(--ink-2);max-height:calc(100vh - 80px);overflow-y:auto}
.site-header[data-open] .primary-nav{display:block}
.primary-nav__list{display:flex;flex-direction:column}
.primary-nav__list li + li{border-top:1px solid var(--line)}
.primary-nav__list a{
  position:relative;display:block;
  padding:14px 0 14px 14px;
  font-size:15px;font-weight:700;color:var(--text-dim);
  transition:color .2s var(--ease);
}
.primary-nav__list a::after{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:2px;height:0;background:var(--neon);transition:height .2s var(--ease);
}
.primary-nav__list a:hover{color:var(--text)}
.primary-nav__list a[aria-current="page"]{color:var(--neon)}
.primary-nav__list a[aria-current="page"]::after{height:22px}

.scroll-progress{height:2px;width:100%;background:rgba(232,243,238,.07);overflow:hidden}
.scroll-progress span{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--neon),var(--orange));
  transform:scaleX(var(--progress,0));transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ---------- footer ---------- */
.site-footer{
  margin-top:clamp(40px,6vw,80px);
  background:#081814;
  border-top:1px solid var(--line);
  padding-block:clamp(36px,5vw,60px) 0;
}
.footer-grid{
  display:grid;gap:clamp(24px,3.4vw,40px);
  grid-template-columns:minmax(0,1fr);
  padding-bottom:clamp(28px,4vw,46px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.brand--footer .brand__name{font-size:17px}
.footer-brand__text{
  font-size:14px;line-height:1.7;color:var(--text-dim);max-width:34ch;
}
.footer-col{min-width:0}
.footer-col__title{
  font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--neon);margin-bottom:14px;line-height:1.5;
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-list a{
  display:inline-block;font-size:14px;color:var(--text-dim);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-list a:hover{color:var(--neon);transform:translateX(2px)}
.footer-contact{font-style:normal;display:flex;flex-direction:column;gap:8px}
.footer-contact__line{font-size:13.5px;line-height:1.65;color:var(--text-dim);word-break:break-word}
.footer-contact__line:last-child{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.02em;color:var(--neon-soft)}
.footer-note{
  margin-top:12px;font-size:12.5px;line-height:1.65;color:var(--text-dim);max-width:32ch;
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding-block:18px 22px;
  border-top:1px solid var(--line);
}
.footer-bottom__copy{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:var(--text-dim);max-width:none;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal a{
  font-size:12px;letter-spacing:.04em;color:var(--text-dim);
  transition:color .2s var(--ease);
}
.footer-legal a:hover{color:var(--neon)}

/* ---------- content components ---------- */
.surface-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(16px,2vw,24px);
  box-shadow:var(--shadow);
  min-width:0;
}
.surface-card--flush{padding:0;overflow:hidden}
.theme-band{
  background:var(--ink-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding-block:clamp(18px,3vw,32px);
  margin-block:clamp(28px,4vw,52px);
}
.theme-band > .shell{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px;justify-content:space-between}

.data-figure{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.01em;
}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(2rem,4vw,3.4rem);
  line-height:1;
  font-weight:700;
  color:var(--neon);
  letter-spacing:-.02em;
}
.stat-value--amber{color:var(--amber)}
.stat-unit{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--text-dim)}

.data-table{font-size:14px}
.data-table caption{
  text-align:left;font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text-dim);padding-bottom:10px;
}
.data-table th,.data-table td{
  padding:11px 12px;text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:middle;
}
.data-table th{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);font-weight:700}
.data-table td{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--text)}
.data-table td:first-child{font-family:var(--font-sans);font-weight:600}
.data-table tbody tr:hover{background:rgba(47,227,165,.05)}

.breadcrumb{font-size:12.5px;letter-spacing:.04em;color:var(--text-dim)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--line);font-family:var(--font-mono)}
.breadcrumb a{color:var(--text-dim);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--neon)}
.breadcrumb [aria-current="page"]{color:var(--text)}

.prose{max-width:68ch;font-size:16.5px;line-height:1.78;color:var(--text)}
.prose > * + *{margin-top:1.2em}
.prose h2,.prose h3{margin-top:1.9em;color:var(--text)}
.prose ul,.prose ol{list-style:disc;padding-left:1.25em;color:var(--text-dim)}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.5em}
.prose a{color:var(--neon);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--text)}
.prose--light{
  background:var(--light);color:var(--light-ink);
  border:1px solid #D9E6DF;border-radius:var(--radius-lg);
  padding:clamp(20px,3vw,40px);
  max-width:none;
}
.prose--light h2,.prose--light h3,.prose--light strong{color:#0E241C}
.prose--light ul,.prose--light ol,.prose--light p{color:#2C423A}
.prose--light a{color:#0C6B4C}
.prose--light .section-label{color:#0C6B4C}

.anchor-list{
  display:flex;flex-direction:column;gap:2px;
  border-left:1px solid var(--line);
  padding-left:2px;
}
.anchor-list a{
  display:block;padding:8px 14px;
  font-size:13.5px;line-height:1.5;color:var(--text-dim);
  border-left:2px solid transparent;margin-left:-3px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.anchor-list a:hover{color:var(--text)}
.anchor-list a[aria-current]{color:var(--neon);border-left-color:var(--neon)}

.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--radius);
  aspect-ratio:16 / 10;
  background:
    repeating-linear-gradient(90deg,rgba(47,227,165,.10) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(0deg,rgba(47,227,165,.10) 0 1px,transparent 1px 44px),
    #0D241D;
}
.media-frame > img,.media-frame > picture > img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame__caption{
  position:absolute;left:12px;bottom:12px;
  padding:4px 9px;border-radius:6px;
  background:rgba(11,31,26,.78);border:1px solid var(--line);
  font-size:11.5px;letter-spacing:.08em;color:var(--text-dim);
}

/* ---------- reveal ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- breakpoints ---------- */
@media (min-width:600px){
  .header-note{display:flex}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:760px){
  .chip-link{display:inline-flex}
  .brand__name{font-size:19px}
}
@media (min-width:900px){
  .header-upper__inner{grid-template-columns:auto minmax(0,1fr) auto;gap:24px}
  .header-note{justify-self:center}
  .nav-toggle{display:none}
  .primary-nav{display:block !important;border-top:0;max-height:none;overflow:visible;background:transparent}
  .primary-nav__list{flex-direction:row;flex-wrap:wrap;gap:2px;padding-block:2px}
  .primary-nav__list li + li{border-top:0}
  .primary-nav__list a{padding:13px 16px;font-size:14.5px}
  .primary-nav__list a::after{
    left:16px;right:16px;top:auto;bottom:6px;transform:none;
    width:auto;height:2px;
  }
  .primary-nav__list a[aria-current="page"]::after{height:2px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .layout-split{grid-template-columns:240px minmax(0,1fr)}
  .rail{position:sticky;top:150px;align-self:start}
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.15fr 1fr}
  .footer-brand{grid-column:auto}
}
@media (max-width:599px){
  .header-upper__inner{gap:10px}
  .brand__claim{display:none}
  .nav-toggle__label{display:none}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

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