:root{
  --void:#070B12;
  --void-2:#0A1220;
  --panel:#101A2B;
  --panel-2:#0C1522;
  --blue:#1E5BFF;
  --blue-soft:rgba(30,91,255,.16);
  --orange:#FF6A1A;
  --orange-soft:rgba(255,106,26,.16);
  --cyan:#22F5D4;
  --cyan-soft:rgba(34,245,212,.14);
  --mist:#A7B2C4;
  --white:#F4F8FF;
  --line:#2A3B55;
  --red:#FF3B5C;
  --green:#38D996;
  --glow:#FFB27A;
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --shell:1240px;
  --gutter:clamp(18px,4vw,48px);
  --cut:16px;
  --ease:cubic-bezier(.22,.68,.28,1);
}

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

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

body,
h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol,li{margin:0;}

ul[class],
ol[class]{list-style:none;padding:0;}

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

a{color:inherit;}

button,
input,
select,
textarea{font:inherit;color:inherit;}

main{display:block;}

#main-content{scroll-margin-top:132px;}

body{
  min-height:100vh;
  background-color:var(--void);
  background-image:
    radial-gradient(1100px 620px at 82% -12%,rgba(30,91,255,.22),transparent 62%),
    radial-gradient(820px 460px at 4% 6%,rgba(255,106,26,.09),transparent 58%),
    linear-gradient(rgba(42,59,85,.24) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,59,85,.24) 1px,transparent 1px);
  background-size:auto,auto,76px 76px,76px 76px;
  background-attachment:fixed;
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.025em;
  color:var(--white);
  text-wrap:balance;
}

h1{font-size:clamp(2.3rem,6vw,4.5rem);}
h2{font-size:clamp(1.7rem,3.6vw,2.8rem);}
h3{font-size:clamp(1.15rem,2vw,1.55rem);letter-spacing:-.015em;}
h4{font-size:1.05rem;letter-spacing:-.01em;}

p{line-height:1.75;}

small{font-size:.82rem;}

/* 中文正文段落控宽 */
.prose p,
.prose li{max-width:40em;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:2px;
}

::selection{
  background:var(--orange);
  color:#140902;
}

/* ============ SKIP LINK ============ */
.skip-link{
  position:absolute;
  left:50%;
  top:0;
  z-index:999;
  transform:translate(-50%,-160%);
  padding:10px 20px;
  background:var(--cyan);
  color:#04121A;
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.1em;
  text-decoration:none;
  border-radius:0 0 6px 6px;
  transition:transform .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible{
  transform:translate(-50%,0);
  outline-offset:-2px;
}

/* ============ HEADER ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:linear-gradient(180deg,rgba(7,11,18,.97),rgba(7,11,18,.88));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
}

@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
  .site-header{background:rgba(7,11,18,.99);}
}

.header-inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.header-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-block:11px;
  max-height:56px;
  overflow:hidden;
  border-bottom:1px solid rgba(42,59,85,.75);
  transition:max-height .26s var(--ease),opacity .18s linear,border-color .2s linear;
}

.header-tagline{
  font-family:var(--font-mono);
  font-size:.71rem;
  font-weight:500;
  letter-spacing:.09em;
  color:var(--mist);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.utility-nav{
  display:flex;
  align-items:center;
  gap:2px;
  flex:none;
}

.utility-nav__item{display:block;}

.utility-nav__link{
  display:inline-block;
  padding:4px 11px;
  border-left:2px solid transparent;
  color:var(--mist);
  font-size:.8rem;
  font-weight:500;
  text-decoration:none;
  transition:color .15s linear,background-color .15s linear,border-color .15s linear;
}

.utility-nav__link:hover,
.utility-nav__link:focus-visible{
  color:var(--white);
  background:rgba(30,91,255,.2);
  border-left-color:var(--cyan);
}

.masthead{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  padding-block:clamp(12px,2vw,20px) clamp(6px,1vw,10px);
  transition:padding .26s var(--ease);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:clamp(8px,1.4vw,14px);
  text-decoration:none;
  color:var(--white);
  transition:opacity .16s linear;
}

.brand:hover{opacity:.86;}

.brand__tick{
  width:10px;
  height:10px;
  flex:none;
  background:var(--orange);
  transform:rotate(12deg);
  box-shadow:0 0 18px rgba(255,106,26,.8);
  transition:width .26s var(--ease),height .26s var(--ease);
}

.brand__word{
  font-family:var(--font-display);
  font-size:clamp(1.7rem,4vw,2.7rem);
  font-weight:900;
  letter-spacing:-.035em;
  line-height:1;
  white-space:nowrap;
  transition:font-size .26s var(--ease);
}

.brand__meta{
  align-self:flex-end;
  padding-bottom:4px;
  font-family:var(--font-mono);
  font-size:.6rem;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--mist);
  white-space:nowrap;
  transition:opacity .18s linear;
}

.nav-toggle{
  display:none;
  position:absolute;
  right:0;
  top:50%;
  transform:translateY(-50%);
  width:46px;
  height:42px;
  padding:0 11px;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  background:rgba(16,26,43,.92);
  border:1px solid var(--line);
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background-color .18s linear,border-color .18s linear;
}

.nav-toggle:hover{border-color:var(--blue);}

.nav-toggle[aria-expanded="true"]{
  background:var(--blue);
  border-color:var(--blue);
}

.nav-toggle__bar{
  display:block;
  width:100%;
  height:2px;
  background:var(--white);
  transition:transform .22s var(--ease),opacity .16s linear;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.nav-toggle__label{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

.site-nav{
  border-top:1px solid rgba(42,59,85,.55);
}

.site-nav__list{
  display:flex;
  justify-content:center;
  align-items:stretch;
  gap:clamp(4px,1.4vw,22px);
}

.site-nav__item{flex:none;}

.site-nav__link{
  position:relative;
  display:block;
  padding:14px 4px 13px;
  color:var(--mist);
  font-size:.93rem;
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  transition:color .16s linear,padding .26s var(--ease);
}

.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:6px;
  height:2px;
  background:var(--blue);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease),background-color .16s linear;
}

.site-nav__link:hover,
.site-nav__link:focus-visible{color:var(--white);}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after{transform:scaleX(1);}

.site-nav__link[aria-current="page"]{color:var(--white);}

.site-nav__link[aria-current="page"]::after{
  background:var(--orange);
  transform:scaleX(1);
}

.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  overflow:hidden;
  background:rgba(42,59,85,.65);
  pointer-events:none;
}

.scroll-meter__bar{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--blue) 0%,var(--cyan) 62%,var(--orange) 100%);
  transform:scaleX(0);
  transform-origin:left center;
}

.site-header[data-compact="true"] .header-top{
  max-height:0;
  opacity:0;
  border-bottom-color:transparent;
}

.site-header[data-compact="true"] .masthead{padding-block:8px;}

.site-header[data-compact="true"] .brand__word{
  font-size:clamp(1.15rem,2.4vw,1.4rem);
}

.site-header[data-compact="true"] .brand__meta{
  opacity:0;
  pointer-events:none;
}

.site-header[data-compact="true"] .brand__tick{
  width:8px;
  height:8px;
}

.site-header[data-compact="true"] .site-nav__link{
  padding-top:10px;
  padding-bottom:9px;
}

/* ============ FOOTER ============ */
.site-footer{
  position:relative;
  margin-top:clamp(64px,8vw,110px);
  padding-block:clamp(40px,6vw,72px) clamp(20px,3vw,32px);
  overflow:hidden;
  border-top:1px solid var(--line);
  background:
    radial-gradient(900px 420px at 88% 0%,rgba(30,91,255,.2),transparent 62%),
    linear-gradient(180deg,rgba(12,21,34,.55) 0%,rgba(7,11,18,.98) 46%);
}

.footer-beacon{
  position:absolute;
  top:0;
  left:50%;
  width:min(360px,48%);
  height:2px;
  transform:translateX(-50%);
  background:linear-gradient(90deg,transparent,var(--orange) 26%,var(--cyan) 74%,transparent);
  opacity:.9;
  pointer-events:none;
}

.footer-inner{
  position:relative;
  z-index:1;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.footer-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:14px 32px;
  padding-bottom:clamp(22px,3vw,34px);
  border-bottom:1px solid var(--line);
}

.footer-brand{
  display:inline-flex;
  align-items:center;
  font-family:var(--font-display);
  font-size:clamp(1.55rem,3vw,2.15rem);
  font-weight:900;
  letter-spacing:-.035em;
  color:var(--white);
  text-decoration:none;
  transition:color .16s linear;
}

.footer-brand::before{
  content:"";
  width:13px;
  height:13px;
  margin-right:12px;
  background:var(--orange);
  transform:rotate(12deg);
  box-shadow:0 0 16px rgba(255,106,26,.75);
  flex:none;
}

.footer-brand:hover{color:var(--cyan);}

.footer-motto{
  max-width:36ch;
  color:var(--mist);
  font-size:.9rem;
  line-height:1.65;
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(24px,4vw,48px);
  padding-block:clamp(28px,4vw,44px);
}

.footer-block{min-width:0;}

.footer-block__title{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0 0 15px;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.14em;
  line-height:1.4;
  text-transform:uppercase;
  color:var(--cyan);
}

.footer-block__title::before{
  content:"";
  width:16px;
  height:2px;
  flex:none;
  background:var(--orange);
}

.footer-links{
  display:grid;
  gap:1px;
}

.footer-links a{
  display:inline-block;
  padding-block:5px;
  color:var(--mist);
  font-size:.92rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .15s linear,border-color .15s linear,transform .15s var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible{
  color:var(--white);
  border-bottom-color:var(--orange);
  transform:translateX(3px);
}

.footer-contact{
  display:grid;
  gap:13px;
}

.footer-contact li{
  display:grid;
  gap:3px;
  font-size:.86rem;
  line-height:1.6;
  color:var(--mist);
  overflow-wrap:anywhere;
}

.footer-contact__key{
  font-family:var(--font-mono);
  font-size:.62rem;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(167,178,196,.62);
}

.footer-contact a{
  color:var(--white);
  text-decoration:none;
  border-bottom:1px solid rgba(34,245,212,.32);
  transition:color .15s linear,border-color .15s linear;
}

.footer-contact a:hover,
.footer-contact a:focus-visible{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  padding-top:clamp(18px,2.4vw,26px);
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.69rem;
  letter-spacing:.05em;
  line-height:1.7;
  color:var(--mist);
}

.footer-legal{margin:0;}

.footer-note{
  margin:0;
  max-width:48ch;
  opacity:.8;
}

.footer-year{
  margin:0;
  color:var(--cyan);
  white-space:nowrap;
}

/* ============ SHARED LAYOUT COMPONENTS ============ */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{
  position:relative;
  padding-block:clamp(48px,7vw,96px);
}

.section--tight{padding-block:clamp(30px,4vw,56px);}

.section-head{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:clamp(16px,3vw,40px);
  align-items:end;
  margin-bottom:clamp(22px,3vw,38px);
}

.section-title{
  font-size:clamp(1.8rem,3.6vw,2.75rem);
  margin-top:12px;
}

.section-sub{
  color:var(--mist);
  font-size:.98rem;
  line-height:1.75;
  max-width:42ch;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}

.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  flex:none;
  background:var(--orange);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  border:1px solid transparent;
  background:var(--blue);
  color:var(--white);
  font-family:var(--font-body);
  font-size:.94rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  transition:transform .16s var(--ease),background-color .16s linear,box-shadow .16s linear,border-color .16s linear;
}

.btn:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 28px -14px rgba(30,91,255,.95);
}

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

.btn--ghost{
  background:transparent;
  color:var(--white);
  border-color:var(--line);
}

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

.btn--accent{
  background:var(--orange);
  color:#170A03;
}

.btn--accent:hover{
  box-shadow:0 12px 28px -14px rgba(255,106,26,.95);
}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  background:rgba(16,26,43,.78);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:.69rem;
  font-weight:600;
  letter-spacing:.09em;
  line-height:1.5;
  text-transform:uppercase;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);
}

.chip--accent{
  border-color:rgba(255,106,26,.6);
  color:var(--orange);
  background:var(--orange-soft);
}

.chip--live{
  border-color:rgba(34,245,212,.5);
  color:var(--cyan);
  background:var(--cyan-soft);
}

.panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(16,26,43,.96),rgba(10,18,32,.96));
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
}

.split{
  display:grid;
  grid-template-columns:minmax(0,5fr) minmax(0,7fr);
  gap:clamp(24px,4vw,64px);
  align-items:start;
}

.split--reverse{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}

.prose{
  max-width:68ch;
  color:var(--mist);
  font-size:1rem;
  line-height:1.78;
}

.prose > * + *{margin-top:1em;}

.prose h2,
.prose h3{
  color:var(--white);
  margin-top:1.9em;
}

.prose h2{font-size:clamp(1.4rem,2.4vw,1.85rem);}
.prose h3{font-size:1.15rem;}

.prose strong{color:var(--white);font-weight:700;}

.prose a{
  color:var(--cyan);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

.prose ul,
.prose ol{padding-left:1.25em;}

.prose li + li{margin-top:.4em;}

.breadcrumb{
  padding-top:clamp(16px,2.4vw,26px);
}

.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0 8px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.07em;
  color:var(--mist);
}

.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}

.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:var(--line);
  margin-right:2px;
}

.breadcrumb__link{
  color:var(--mist);
  text-decoration:none;
  transition:color .15s linear;
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible{color:var(--cyan);}

.breadcrumb__current{color:var(--white);}

/* ============ REUSABLE IMAGE CONTAINER ============ */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border:1px solid var(--line);
  background:
    radial-gradient(120% 100% at 20% 0%,rgba(30,91,255,.28),transparent 60%),
    linear-gradient(150deg,var(--panel),var(--void-2));
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
}

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:contrast(1.08) saturate(1.05);
}

.media-frame--wide{aspect-ratio:16 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}

.media-frame__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:14px 16px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.08em;
  line-height:1.5;
  color:var(--mist);
  background:linear-gradient(180deg,transparent,rgba(7,11,18,.92));
}

/* ============ SCROLL REVEAL ============ */
[data-reveal].is-pending{
  opacity:0;
  transform:translateY(14px);
}

[data-reveal].is-pending.is-visible{
  opacity:1;
  transform:none;
  transition:opacity .55s var(--ease),transform .55s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}

/* ============ RESPONSIVE ============ */
@media (max-width:1100px){
  .site-nav__link{font-size:.88rem;}
}

@media (max-width:960px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:900px){
  .nav-toggle{display:flex;}

  .site-nav{
    max-height:0;
    overflow:hidden;
    border-top:1px solid transparent;
    transition:max-height .3s var(--ease),border-color .2s linear;
  }

  .site-nav[data-open]{
    max-height:520px;
    padding-bottom:8px;
    border-top-color:var(--line);
  }

  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }

  .site-nav__item{width:100%;}

  .site-nav__link{
    padding:14px 6px;
    font-size:1rem;
    border-bottom:1px solid rgba(42,59,85,.6);
  }

  .site-nav__link::after{display:none;}

  .site-nav__link[aria-current="page"]{
    color:var(--orange);
    border-bottom-color:rgba(255,106,26,.55);
  }

  .masthead{padding-block:12px 10px;}

  .header-top{
    max-height:74px;
    flex-wrap:wrap;
    gap:6px;
  }

  .header-tagline{font-size:.66rem;letter-spacing:.05em;}

  .utility-nav__link{
    padding:3px 9px;
    font-size:.76rem;
  }

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

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

@media (max-width:720px){
  .brand__meta{display:none;}
  .site-header[data-compact="true"] .header-top{max-height:0;}
  .footer-head{flex-direction:column;align-items:flex-start;}
}

@media (max-width:600px){
  .header-tagline{display:none;}
  .header-top{justify-content:center;max-height:44px;}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-base{flex-direction:column;align-items:flex-start;}
  body{background-attachment:scroll;}
  :root{--cut:12px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}

  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }

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