:root{
  --bg-base:#1a2a3a;
  --bg-deep:#0d1621;
  --bg-panel:#243749;
  --accent:#c6ff00;
  --accent-soft:#d9ff4d;
  --warm:#ff6b35;
  --warm-soft:#ff9d7a;
  --text-main:#e8f0f5;
  --text-sub:#8a9fb5;
  --line:#2e4a5f;
  --font-display:"DIN Condensed","Noto Sans SC","Noto Sans SC Black","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"Roboto Mono","IBM Plex Mono","SFMono-Regular",Consolas,monospace;
  --header-h:76px;
  --shell-w:min(1440px,calc(100vw - 48px));
  --radius:2px;
  --shadow-glow:0 0 0 1px rgba(198,255,0,.25),0 12px 32px rgba(0,0,0,.35);
  --header-z:50;
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h)}
body{
  background:var(--bg-base);
  color:var(--text-main);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.75;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{padding:0;margin:0;list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
.skip-link{
  position:fixed;
  top:-100px;
  left:16px;
  z-index:1000;
  background:var(--accent);
  color:var(--bg-deep);
  font-weight:700;
  padding:10px 18px;
  border-radius:var(--radius);
  transition:top .2s ease;
}
.skip-link:focus{top:16px}
#main-content{display:block;scroll-margin-top:var(--header-h)}

/* ===== Header ===== */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:var(--header-z);
  background:rgba(13,22,33,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.scroll-progress{
  position:absolute;
  top:0;left:0;
  height:3px;
  width:0%;
  background:linear-gradient(90deg,var(--accent),var(--warm));
  opacity:0;
  transition:opacity .3s ease,width .1s linear;
}
.site-header[data-scroll-active="true"] .scroll-progress{opacity:1}
.site-header__inner{
  max-width:var(--shell-w);
  margin:0 auto;
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:0 0;
  position:relative;
}
.site-header__brand{
  display:flex;
  align-items:center;
  gap:14px;
  position:relative;
  z-index:2;
}
.site-header__brand-mark{
  position:relative;
  width:34px;height:34px;
  flex:0 0 auto;
  background:var(--accent);
  clip-path:polygon(25% 6%,75% 6%,100% 50%,75% 94%,25% 94%,0 50%);
  box-shadow:0 0 18px rgba(198,255,0,.5);
}
.site-header__brand-mark::after{
  content:"";
  position:absolute;
  inset:8px;
  background:var(--bg-deep);
  clip-path:polygon(25% 6%,75% 6%,100% 50%,75% 94%,25% 94%,0 50%);
}
.site-header__brand-text{
  display:flex;flex-direction:column;
  gap:2px;
}
.site-header__title{
  font-family:var(--font-display);
  font-size:1.55rem;
  font-weight:800;
  letter-spacing:.04em;
  line-height:1;
  color:var(--text-main);
}
.site-header__subline{
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--text-sub);
  border-left:2px solid var(--accent);
  padding-left:8px;
  line-height:1.4;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:9px 14px;
  color:var(--text-main);
  cursor:pointer;
  min-height:44px;
  z-index:3;
  transition:border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{
  border-color:var(--accent);
  background:rgba(198,255,0,.06);
}
.nav-toggle__icon{
  position:relative;
  width:18px;height:12px;
  display:block;
  border-top:2px solid var(--accent);
  border-bottom:2px solid var(--accent);
  transition:border-color .2s ease;
}
.nav-toggle__icon::before{
  content:"";
  position:absolute;
  top:3px;left:0;width:14px;
  height:2px;
  background:var(--accent);
  transition:transform .2s ease,width .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon{
  border-top-color:transparent;
  border-bottom-color:transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{
  transform:rotate(-45deg);
  width:18px;
  top:5px;
}
.nav-toggle__text{
  font-size:.78rem;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--text-sub);
}
.site-nav{
  display:flex;
  align-items:center;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:4px;
}
.site-nav__item{
  position:relative;
}
.site-nav__item::before{
  content:attr(data-index);
  position:absolute;
  top:-10px;
  right:6px;
  font-family:var(--font-mono);
  font-size:.6rem;
  color:var(--text-sub);
  opacity:0;
  transition:opacity .2s ease;
  z-index:2;
}
.site-nav__link{
  display:block;
  font-size:.9rem;
  font-weight:600;
  letter-spacing:.05em;
  padding:10px 14px;
  color:var(--text-main);
  border-radius:var(--radius);
  position:relative;
  transition:background .2s ease,color .2s ease;
  white-space:nowrap;
}
.site-nav__link::before{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:5px;
  height:2px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s ease;
}
.site-nav__link:hover{
  color:var(--accent);
  background:rgba(198,255,0,.05);
}
.site-nav__link:hover::before{
  transform:scaleX(1);
}
.site-nav__link[aria-current="page"]{
  color:var(--accent);
  background:linear-gradient(135deg,rgba(198,255,0,.12),rgba(198,255,0,.02));
}
.site-nav__link[aria-current="page"]::before{
  transform:scaleX(1);
  background:linear-gradient(90deg,var(--accent),var(--warm));
}

/* ===== Footer ===== */
.site-footer{
  background:var(--bg-deep);
  border-top:3px solid var(--accent);
  margin-top:0;
}
.site-footer__inner{
  max-width:var(--shell-w);
  margin:0 auto;
  padding:70px 0 40px;
  display:grid;
  grid-template-columns:minmax(0,1.3fr) minmax(300px,1fr);
  gap:50px 60px;
}
.site-footer__brand{
  grid-column:1 / -1;
  display:flex;
  gap:24px;
  align-items:flex-start;
  padding-bottom:40px;
  border-bottom:1px solid var(--line);
}
.site-footer__brand-mark{
  flex:0 0 auto;
  width:46px;height:46px;
  background:linear-gradient(135deg,var(--accent),var(--accent-soft));
  clip-path:polygon(25% 6%,75% 6%,100% 50%,75% 94%,25% 94%,0 50%);
  margin-top:6px;
}
.site-footer__brand-name{
  font-family:var(--font-display);
  font-size:2rem;
  font-weight:800;
  letter-spacing:.03em;
  margin:0 0 8px;
  color:var(--text-main);
}
.site-footer__slogan{
  font-size:.95rem;
  color:var(--text-sub);
  max-width:880px;
  line-height:1.8;
  margin:0;
  border-left:2px solid var(--line);
  padding-left:16px;
}
.site-footer__heading{
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--accent);
  margin:0 0 18px;
}
.site-footer__contact-list{
  display:grid;
  gap:10px;
}
.site-footer__contact-item{
  display:grid;
  grid-template-columns:76px 1fr;
  gap:12px;
  font-size:.92rem;
  color:var(--text-main);
}
.site-footer__contact-label{
  font-family:var(--font-mono);
  font-size:.78rem;
  color:var(--text-sub);
  text-transform:uppercase;
  letter-spacing:.06em;
  padding-top:2px;
}
.site-footer__contact-value{
  color:var(--text-main);
}
.link-monoline{
  position:relative;
  color:var(--accent);
  text-decoration:none;
  padding-bottom:2px;
  border-bottom:1px solid var(--line);
  transition:border-color .2s ease,color .2s ease;
}
.link-monoline:hover{
  color:var(--accent-soft);
  border-color:var(--accent);
}
.site-footer__links{
  align-self:start;
  padding-left:0;
}
.site-footer__link-list{
  display:flex;
  gap:24px;
  flex-wrap:wrap;
}
.site-footer__link{
  font-size:.9rem;
  font-weight:600;
  color:var(--text-main);
  position:relative;
  transition:color .2s ease;
}
.site-footer__link::after{
  content:"";
  position:absolute;
  left:0;bottom:-4px;
  height:1px;width:0;
  background:var(--accent);
  transition:width .25s ease;
}
.site-footer__link:hover{
  color:var(--accent);
}
.site-footer__link:hover::after{width:100%}
.site-footer__bottom{
  grid-column:1 / -1;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  padding-top:28px;
  border-top:1px solid var(--line);
  flex-wrap:wrap;
}
.site-footer__meta{
  font-family:var(--font-mono);
  font-size:.75rem;
  color:var(--text-sub);
  margin:0;
  letter-spacing:.05em;
}

/* ===== Shared Layout / Content ===== */
.content-shell{
  max-width:var(--shell-w);
  margin:0 auto;
  padding:calc(var(--header-h) + 52px) 0 80px;
  position:relative;
}
.section-heading{
  display:flex;
  align-items:baseline;
  gap:18px;
  margin:0 0 24px;
}
.section-heading__index{
  font-family:var(--font-mono);
  font-size:clamp(2.2rem,5vw,4rem);
  font-weight:800;
  color:var(--accent);
  line-height:1;
  letter-spacing:-.03em;
  opacity:.9;
}
.section-heading__text{
  font-family:var(--font-display);
  font-size:clamp(1.4rem,3vw,2.2rem);
  font-weight:800;
  letter-spacing:.02em;
  color:var(--text-main);
  margin:0;
}
.page-hero{
  position:relative;
  padding:80px 0 60px;
  margin-bottom:48px;
  border-bottom:1px solid var(--line);
}
.page-hero::before{
  content:"";
  position:absolute;
  top:0;right:0;
  width:60%;
  height:100%;
  background:linear-gradient(120deg,transparent,rgba(198,255,0,.05));
  clip-path:polygon(18% 0,100% 0,82% 100%,0 100%);
  pointer-events:none;
}
.page-hero__title{
  font-family:var(--font-display);
  font-size:clamp(3rem,8vw,6.2rem);
  font-weight:800;
  line-height:.95;
  letter-spacing:-.01em;
  margin:0 0 16px;
  max-width:780px;
  color:var(--text-main);
  position:relative;
}
.grid-list{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:16px;
}
.grid-list__item{
  background:var(--bg-panel);
  border:1px solid var(--line);
  padding:22px;
  position:relative;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.grid-list__item:hover{
  transform:translateY(-2px);
  border-color:rgba(198,255,0,.5);
  box-shadow:var(--shadow-glow);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  padding:5px 10px;
  border-radius:var(--radius);
  background:rgba(138,159,181,.12);
  color:var(--text-sub);
  border:1px solid var(--line);
}
.tag--accent{
  background:rgba(198,255,0,.1);
  color:var(--accent);
  border-color:rgba(198,255,0,.35);
}
.tag--warm{
  background:rgba(255,107,53,.1);
  color:var(--warm-soft);
  border-color:rgba(255,107,53,.35);
}
.image-frame{
  position:relative;
  background:var(--bg-deep);
  border:1px solid var(--line);
  overflow:hidden;
}
.image-frame__ratio{
  aspect-ratio:16 / 9;
  background:
    linear-gradient(145deg,rgba(198,255,0,.04),transparent 55%),
    repeating-linear-gradient(135deg,rgba(46,74,95,.2) 0 1px,transparent 1px 14px),
    var(--bg-deep);
  position:relative;
}
.image-frame__ratio::after{
  content:"";
  position:absolute;
  top:0;left:0;right:0;bottom:0;
  background:linear-gradient(110deg,transparent 65%,rgba(198,255,0,.05) 90%,transparent 100%);
}
.image-frame__caption{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:10px 14px;
  font-size:.75rem;
  color:var(--text-sub);
  font-family:var(--font-mono);
  letter-spacing:.04em;
  border-top:1px solid var(--line);
}
.divider-corner{
  display:flex;
  align-items:center;
  gap:14px;
  margin:40px 0;
  color:var(--text-sub);
}
.divider-corner__line{
  height:1px;
  background:var(--line);
  flex:1;
  position:relative;
  overflow:hidden;
}
.divider-corner__line::after{
  content:"";
  position:absolute;
  top:0;left:0;
  height:1px;
  width:34%;
  background:var(--accent);
}
.card-sheen{
  position:relative;
  background:var(--bg-panel);
  border:1px solid var(--line);
  padding:28px;
  overflow:hidden;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.card-sheen::before{
  content:"";
  position:absolute;
  top:0;left:-40%;
  width:40%;
  height:100%;
  background:linear-gradient(105deg,transparent,rgba(198,255,0,.08),transparent);
  transform:skewX(-18deg);
  transition:left .5s ease;
}
.card-sheen:hover{
  transform:translateY(-2px);
  border-color:rgba(198,255,0,.5);
  box-shadow:var(--shadow-glow);
}
.card-sheen:hover::before{
  left:110%;
}

/* ===== Responsive ===== */
@media (max-width:1100px){
  :root{
    --shell-w:min(100vw - 40px,1440px);
  }
  .site-footer__inner{
    grid-template-columns:1fr 1fr;
    gap:40px;
  }
  .site-footer__brand{
    grid-column:1 / -1;
  }
  .site-footer__links{
    padding-left:0;
  }
}
@media (max-width:760px){
  :root{
    --header-h:68px;
    --shell-w:calc(100vw - 32px);
  }
  .nav-toggle{
    display:flex;
  }
  .site-nav{
    position:fixed;
    top:0;left:0;right:0;bottom:0;
    background:rgba(13,22,33,.97);
    display:flex;
    align-items:center;
    justify-content:flex-start;
    padding:calc(var(--header-h) + 20px) 24px 40px;
    opacity:0;
    visibility:hidden;
    transform:translateY(10px);
    transition:opacity .25s ease,transform .25s ease,visibility .25s ease;
    border:none;
    overflow-y:auto;
    z-index:-1;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    width:100%;
  }
  .site-nav__item::before{
    display:none;
  }
  .site-nav__link{
    font-size:1.3rem;
    padding:14px 6px;
    border-bottom:1px solid var(--line);
    border-radius:0;
    display:flex;
    justify-content:space-between;
    align-items:center;
    font-weight:700;
    letter-spacing:.08em;
  }
  .site-nav__link::after{
    content:"→";
    font-family:var(--font-mono);
    color:var(--accent);
    opacity:0;
    transform:translateX(-6px);
    transition:opacity .2s ease,transform .2s ease;
  }
  .site-nav__link:hover::after,
  .site-nav__link[aria-current="page"]::after{
    opacity:1;
    transform:translateX(0);
  }
  .site-nav__link::before{
    display:none;
  }
  .site-footer__inner{
    grid-template-columns:1fr;
    padding:50px 0 32px;
    gap:36px;
  }
  .site-footer__brand{
    flex-direction:column;
    gap:14px;
    padding-bottom:28px;
  }
  .site-footer__bottom{
    flex-direction:column;
    align-items:flex-start;
  }
  .site-footer__link-list{
    flex-direction:column;
    gap:10px;
  }
  .grid-list{
    grid-template-columns:1fr 1fr;
  }
}
@media (max-width:480px){
  .grid-list{
    grid-template-columns:1fr;
  }
  .page-hero{
    padding:50px 0 40px;
  }
  .site-header__subline{
    display:none;
  }
  .site-header__title{
    font-size:1.3rem;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion:reduce){
  html{
    scroll-behavior:auto;
  }
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
}