/* ===== 1. reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid #4DE3D0;outline-offset:3px;border-radius:1px}
.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}

/* ===== 2. tokens ===== */
:root{
  --void:#070B1F;
  --nebula:#241447;
  --cream:#F4E9D4;
  --ink:#1B1612;
  --gold:#F2C14E;
  --cyan:#4DE3D0;
  --ember:#E2603B;
  --aurora:#6E8BFF;
  --mist:#B8B4D9;
  --glass:rgba(255,255,255,.08);
  --line:rgba(184,180,217,.20);
  --line-strong:rgba(184,180,217,.40);
  --frame:24px;
  --rail:58px;
  --bar-h:74px;
  --bottom-h:42px;
  --mindex-h:60px;
  --shadow-glass:0 18px 44px rgba(4,6,18,.55);
  --ease:cubic-bezier(.22,.7,.24,1);
  --font-display:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ===== 3. base ===== */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--cream);
  background-color:var(--void);
  min-height:100vh;
  padding-top:var(--bar-h);
  padding-bottom:calc(var(--mindex-h) + 8px);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(circle at 14% 2%, rgba(110,139,255,.22), transparent 40%),
    radial-gradient(circle at 88% -6%, rgba(77,227,208,.14), transparent 38%),
    radial-gradient(circle at 46% 108%, rgba(226,96,59,.12), transparent 46%),
    radial-gradient(circle at 70% 44%, rgba(36,20,71,.85), transparent 62%);
}
::selection{background:var(--gold);color:var(--ink)}

/* ===== 4. skip link ===== */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;
  background:var(--gold);
  color:var(--ink);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:2px;
  transition:transform .25s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ===== 5. header frame ===== */
.site-header{position:relative;z-index:90}
.frame-bar{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:90;
  height:var(--bar-h);
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
  padding:0 var(--frame);
  background:linear-gradient(180deg, rgba(7,11,31,.97), rgba(7,11,31,.84));
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:padding .4s var(--ease);
}
.frame-bar::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  background:linear-gradient(90deg, transparent, var(--gold), var(--cyan), transparent);
  opacity:.55;
}
.brand{
  display:flex;
  align-items:center;
  gap:9px;
  flex:0 0 auto;
  color:var(--cream);
  transition:color .3s var(--ease);
}
.brand-star{
  color:var(--gold);
  font-size:15px;
  line-height:1;
  display:inline-block;
  transition:transform .7s var(--ease);
}
.brand-name{
  font-size:19px;
  font-weight:700;
  letter-spacing:.08em;
  white-space:nowrap;
}
.brand-sub{
  display:none;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--mist);
}
.brand:hover .brand-star{transform:rotate(135deg)}
.brand:hover .brand-name{color:var(--gold)}

.nav-toggle{
  display:flex;
  align-items:center;
  gap:7px;
  margin-left:auto;
  padding:9px 12px;
  border:1px solid var(--line-strong);
  background:var(--glass);
  color:var(--cream);
  border-radius:2px;
  transition:border-color .3s var(--ease), background .3s var(--ease), color .3s var(--ease);
}
.nav-toggle-bar{
  display:block;
  width:15px;
  height:1px;
  background:var(--gold);
  transition:transform .3s var(--ease), background .3s var(--ease);
}
.nav-toggle-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  text-transform:uppercase;
}
.nav-toggle[aria-expanded="true"]{
  background:var(--gold);
  border-color:var(--gold);
  color:var(--ink);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar{background:var(--ink)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-4px) rotate(-45deg)}

.frame-nav{display:none}
.frame-nav[data-open]{
  position:absolute;
  top:100%;
  left:0;
  right:0;
  display:flex;
  flex-direction:column;
  gap:18px;
  max-height:calc(100vh - var(--bar-h) - var(--mindex-h));
  overflow-y:auto;
  padding:20px var(--frame) 28px;
  background:linear-gradient(180deg, rgba(10,14,38,.99), rgba(7,11,31,.97));
  border-bottom:1px solid var(--line-strong);
  box-shadow:var(--shadow-glass);
}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-item{display:block}
.nav-link{
  display:block;
  padding:11px 2px;
  font-size:16px;
  letter-spacing:.04em;
  border-bottom:1px solid rgba(184,180,217,.12);
  transition:color .25s var(--ease);
}
.nav-link:hover{color:var(--gold)}
.nav-link[aria-current="page"]{color:var(--gold);font-weight:700}
.nav-link[aria-current="page"]::before{
  content:"✦";
  margin-right:.55em;
  font-size:.78em;
  color:var(--ember);
}
.nav-tail{display:flex;flex-direction:column;align-items:flex-start;gap:16px;padding-top:6px}
.nav-utility{display:flex;flex-direction:column;gap:4px}
.nav-link--small{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist);
  padding:4px 0;
  border-bottom:0;
}
.nav-link--small:hover{color:var(--cyan)}
.nav-cta{width:100%;justify-content:center}

/* side rails */
.frame-rail--left,.frame-rail--right{display:none}
.frame-rail--bottom{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:88;
  display:flex;
  align-items:center;
  justify-content:center;
  height:var(--mindex-h);
  padding:0 var(--frame);
  background:linear-gradient(0deg, rgba(7,11,31,.98), rgba(7,11,31,.86));
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
}
.rail-ticker{display:none}
.rail-dot{
  display:inline-block;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 10px var(--cyan);
  flex:0 0 auto;
}
.mobile-index{display:flex;width:100%;gap:4px}
.mobile-index-link{
  flex:1 1 0;
  text-align:center;
  padding:9px 4px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
  border:1px solid transparent;
  border-radius:2px;
  transition:color .25s var(--ease), border-color .25s var(--ease);
}
.mobile-index-link:hover{color:var(--gold);border-color:rgba(242,193,78,.4)}
.rail-meta{display:none}
.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  top:0;
  height:2px;
  background:rgba(184,180,217,.16);
  overflow:hidden;
}
.scroll-progress-fill{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--aurora),var(--cyan),var(--gold));
}

/* condensed state */
[data-site-header][data-condensed="true"] .frame-bar{padding-inline:calc(var(--frame) + 6px)}
[data-site-header][data-condensed="true"] .frame-rail--left{opacity:.3;transform:translateX(-42%)}
[data-site-header][data-condensed="true"] .frame-rail--right{opacity:.3;transform:translateX(42%)}

/* ===== 6. footer ===== */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  overflow:hidden;
  color:var(--cream);
  background:linear-gradient(158deg,var(--nebula) 0%, #160e2e 46%, var(--void) 100%);
  border-top:1px solid var(--line-strong);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:1px;
  background:linear-gradient(90deg,var(--ember),var(--gold),var(--cyan),transparent);
  opacity:.8;
}
.footer-orbit{
  position:absolute;
  inset:auto -20% -55% -20%;
  height:78%;
  pointer-events:none;
  background:radial-gradient(58% 58% at 50% 50%, rgba(110,139,255,.24), transparent 70%);
}
.footer-inner{
  position:relative;
  z-index:1;
  width:min(1240px, 100% - var(--frame) * 2);
  margin-inline:auto;
  padding:clamp(38px,6vw,76px) 0 clamp(26px,4vw,40px);
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding-bottom:clamp(22px,3vw,32px);
  border-bottom:1px solid var(--line);
}
.footer-line{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(18px,2.2vw,26px);
  line-height:1.5;
  letter-spacing:-.01em;
  max-width:34ch;
}
.footer-cta{flex:0 0 auto}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(26px,3.4vw,40px);
  padding:clamp(26px,4vw,46px) 0;
}
.footer-brand-name{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:20px;
  font-weight:700;
  letter-spacing:.1em;
}
.footer-mark{color:var(--gold);font-size:14px}
.footer-brand-text{
  margin-top:10px;
  max-width:36ch;
  font-size:14px;
  line-height:1.85;
  color:var(--mist);
}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:rgba(244,233,212,.88);
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease), border-color .25s var(--ease);
}
.footer-link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer-col--contact{}
.footer-contact-item{display:flex;flex-direction:column;gap:2px}
.footer-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:rgba(184,180,217,.75);
}
.copy-btn{
  display:inline-block;
  text-align:left;
  color:var(--cream);
  border-bottom:1px dashed rgba(184,180,217,.45);
  padding-bottom:2px;
  transition:color .25s var(--ease), border-color .25s var(--ease);
}
.copy-btn:hover{color:var(--gold);border-bottom-color:var(--gold)}
.copy-btn[data-copied="true"]{color:var(--cyan);border-bottom-color:var(--cyan)}
.copy-btn[data-copied="true"]::after{
  content:" 已复制";
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
}
.copy-btn[data-copied="false"]{color:var(--ember);border-bottom-color:var(--ember)}
.copy-value{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  word-break:break-all;
}
.copy-value--static{
  display:inline-block;
  color:rgba(244,233,212,.88);
  line-height:1.7;
  word-break:normal;
}
.footer-note{
  margin-top:12px;
  max-width:30ch;
  font-size:12px;
  line-height:1.75;
  color:rgba(184,180,217,.8);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-top:clamp(18px,2.4vw,26px);
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(184,180,217,.85);
}
.footer-legal{line-height:1.9}
.footer-legal .footer-link{font-size:11px}
.footer-copy{letter-spacing:.06em}

/* ===== 7. shared components ===== */
.container{width:min(1240px, 100% - var(--frame) * 2);margin-inline:auto}
.container--narrow{width:min(860px, 100% - var(--frame) * 2);margin-inline:auto}
.section{padding-block:clamp(38px,6vw,88px)}
.stack{display:flex;flex-direction:column;gap:clamp(14px,2vw,22px)}
.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(12px,2vw,24px)}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.display-title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(56px,9vw,104px);
  line-height:.95;
  letter-spacing:-.03em;
}
.section-title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(30px,4vw,46px);
  line-height:1.12;
  letter-spacing:-.02em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--ember);
}
.lede{
  font-size:clamp(16px,1.6vw,19px);
  line-height:1.78;
  color:var(--mist);
  max-width:60ch;
}
.index-num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--gold);
}
.data-num{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(24px,3.4vw,44px);
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cream);
  background:rgba(226,96,59,.16);
  border:1px solid rgba(226,96,59,.55);
  border-radius:999px;
}
.rule{height:1px;border:0;background:linear-gradient(90deg,var(--line-strong),transparent)}
.note-block{
  padding:14px 0 14px 16px;
  border-left:2px solid var(--gold);
  background:linear-gradient(90deg, rgba(242,193,78,.10), transparent);
  color:var(--mist);
  font-size:14px;
  line-height:1.8;
}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
}
.breadcrumb-link{color:var(--mist);transition:color .25s var(--ease)}
.breadcrumb-link:hover{color:var(--gold)}
.breadcrumb-sep{color:rgba(184,180,217,.45)}
.breadcrumb-current{color:var(--gold)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:2px;
  transition:transform .3s var(--ease), background .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease);
}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:#ffd873;transform:translateY(-2px)}
.btn--ghost{background:var(--glass);border-color:var(--line-strong);color:var(--cream)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--cyan{background:var(--cyan);color:#04201d}
.btn--cyan:hover{background:#7bf0e2;transform:translateY(-2px)}

.card{
  padding:clamp(18px,2.4vw,28px);
  background:rgba(36,20,71,.55);
  border:1px solid var(--line);
  border-radius:2px;
}
.card--glass{
  background:var(--glass);
  border-color:rgba(184,180,217,.30);
  box-shadow:var(--shadow-glass);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
}
.card--paper{background:var(--cream);color:var(--ink);border-color:rgba(27,22,18,.14)}
.card--paper .eyebrow{color:var(--ember)}
.card--paper .lede{color:rgba(27,22,18,.75)}

/* image containers */
.media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:2px;
  background:
    radial-gradient(circle at 22% 18%, rgba(110,139,255,.35), transparent 48%),
    radial-gradient(circle at 78% 82%, rgba(77,227,208,.22), transparent 46%),
    linear-gradient(150deg,var(--nebula),#0a0a1e 72%);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--slant{clip-path:polygon(0 0,100% 0,100% 92%,0 100%)}
.media-caption{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}
.slant{clip-path:polygon(0 0,100% 0,100% calc(100% - 4vw),0 100%)}

/* ===== 8. motion ===== */
html[data-motion="on"] [data-reveal]{opacity:0;transform:translateY(22px)}
html[data-motion="on"] [data-reveal].is-revealed{
  opacity:1;
  transform:none;
  transition:opacity .75s var(--ease), transform .75s var(--ease);
  transition-delay:calc(var(--stagger, 0) * 80ms);
}

/* ===== 9. breakpoints ===== */
@media (min-width:640px){
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .brand-sub{display:inline-block}
}
@media (max-width:899px){
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:1 / -1}
}
@media (min-width:900px){
  .footer-grid{grid-template-columns:repeat(3,1fr)}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1080px){
  :root{--mindex-h:0px}
  body{padding-inline:var(--rail);padding-bottom:var(--bottom-h)}
  .brand-sub{display:inline-block}
  .nav-toggle{display:none}
  .frame-nav{
    display:flex;
    position:static;
    flex-direction:row;
    align-items:center;
    gap:clamp(10px,1.4vw,22px);
    margin-left:auto;
    max-height:none;
    overflow:visible;
    padding:0;
    background:none;
    border:0;
    box-shadow:none;
  }
  .nav-list{flex-direction:row;gap:clamp(8px,1.2vw,20px)}
  .nav-link{
    padding:6px 2px;
    font-size:14px;
    letter-spacing:.04em;
    border-bottom:0;
    position:relative;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:2px;
    right:2px;
    bottom:0;
    height:1px;
    background:var(--gold);
    transform:scaleX(0);
    transform-origin:left center;
    transition:transform .35s var(--ease), background .35s var(--ease);
  }
  .nav-link:hover::after{transform:scaleX(1)}
  .nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--cyan)}
  .nav-tail{flex-direction:row;align-items:center;gap:14px;padding-top:0;margin-left:6px}
  .nav-utility{display:none}
  .nav-cta{width:auto}
  .frame-rail--left,.frame-rail--right{
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:space-between;
    position:fixed;
    top:var(--bar-h);
    bottom:var(--bottom-h);
    width:var(--rail);
    padding:18px 0;
    background:linear-gradient(180deg, rgba(36,20,71,.60), rgba(7,11,31,.88));
    -webkit-backdrop-filter:blur(6px);
    backdrop-filter:blur(6px);
    transition:opacity .45s var(--ease), transform .45s var(--ease);
  }
  .frame-rail--left{left:0;border-right:1px solid rgba(184,180,217,.16)}
  .frame-rail--right{right:0;border-left:1px solid rgba(184,180,217,.16)}
  .rail-text{
    writing-mode:vertical-rl;
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.32em;
    text-transform:uppercase;
    color:var(--mist);
  }
  .rail-num{
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.1em;
    color:var(--cyan);
  }
  .rail-star{font-size:12px;color:var(--gold)}
  .frame-rail--bottom{
    height:var(--bottom-h);
    justify-content:space-between;
    gap:18px;
    padding:0 calc(var(--frame) + 6px);
  }
  .rail-ticker{
    display:flex;
    align-items:center;
    gap:10px;
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.16em;
    text-transform:uppercase;
    color:var(--mist);
    white-space:nowrap;
    overflow:hidden;
    text-overflow:ellipsis;
  }
  .mobile-index{display:none}
  .rail-meta{
    display:block;
    flex:0 0 auto;
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.24em;
    color:rgba(184,180,217,.7);
  }
  .footer-grid{grid-template-columns:1.5fr .8fr .8fr .8fr 1.2fr}
  .footer-brand{grid-column:auto}
}
@media (min-width:1280px){
  .nav-utility{display:flex;flex-direction:row;align-items:center;gap:16px}
  .nav-link--small{font-size:11px}
  .brand-sub{letter-spacing:.32em}
}

/* ===== 10. 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;
    scroll-behavior:auto !important;
  }
  html[data-motion="on"] [data-reveal]{opacity:1;transform:none}
  .scroll-progress-fill{transition:none}
  .brand:hover .brand-star{transform:none}
  .btn--gold:hover,.btn--cyan:hover{transform:none}
}