/* ============ 1. RESET ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 12px)}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0}
img,svg,video{max-width:100%;height:auto;display:block}
button,input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse}

/* ============ 2. TOKENS ============ */
:root{
  --ink:#071A14;
  --panel:#0D2A21;
  --line:#1E4A3A;
  --lime:#C8FF3D;
  --lime-deep:#8CCF1F;
  --silver:#C9D3D0;
  --mist:#8A9995;
  --amber:#FFB020;
  --pulse:#35A7FF;
  --paper:#F2F7F4;

  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",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","SFMono-Regular",ui-monospace,Menlo,Consolas,"Liberation Mono",monospace;
  --font-editorial:"Noto Serif SC",Georgia,"Songti SC","SimSun",serif;

  --wrap:1280px;
  --gutter:clamp(16px,4vw,52px);
  --header-h:76px;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-hard:5px 5px 0 rgba(0,0,0,.5);
  --shadow-soft:0 22px 48px rgba(0,0,0,.42);
  color-scheme:dark;
}

/* ============ 3. BASE ============ */
body{
  background:var(--ink);
  color:var(--silver);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.55;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  min-height:100vh;
}
#main-content{padding-block-start:var(--header-h)}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  color:var(--paper);
  line-height:1.04;
  letter-spacing:-.015em;
  text-wrap:balance;
}
p{text-wrap:pretty}
a{color:var(--lime);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--paper)}
strong{color:var(--paper);font-weight:600}
small{font-size:.8em}
address{font-style:normal}

::selection{background:var(--lime);color:#08170F}

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

/* ============ 4. UTILITIES ============ */
.container{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,6vw,96px)}
.section-head{
  display:grid;
  gap:.7rem;
  max-width:62ch;
  margin-bottom:clamp(22px,3vw,40px);
}
.rule{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,var(--line),rgba(30,74,58,0));
}

.plate{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--lime);
}
.plate::before{content:"";width:18px;height:2px;background:currentColor;flex:0 0 auto}

.title-xl{font-size:clamp(2.4rem,5.4vw,4.8rem);letter-spacing:-.03em}
.title-lg{font-size:clamp(1.7rem,3.2vw,2.6rem)}
.title-md{font-size:clamp(1.25rem,1.9vw,1.7rem)}

.lede{
  font-size:clamp(1rem,1.15vw,1.12rem);
  line-height:1.62;
  color:var(--silver);
  max-width:56ch;
}

/* ============ 5. BUTTONS ============ */
.btn{
  --btn-bg:var(--lime);
  --btn-fg:#08170F;
  --btn-bd:var(--lime);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55em;
  padding:.8em 1.35em;
  font-family:var(--font-mono);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:2px solid var(--btn-bd);
  border-radius:var(--radius);
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.btn:hover{
  color:var(--btn-fg);
  transform:translate(-2px,-2px);
  box-shadow:var(--shadow-hard);
}
.btn:active{transform:none;box-shadow:none}
.btn--ghost{
  --btn-bg:transparent;
  --btn-fg:var(--paper);
  --btn-bd:var(--line);
}
.btn--ghost:hover{
  --btn-bd:var(--lime);
  --btn-fg:var(--lime);
}

/* ============ 6. TAGS ============ */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:.26em .72em;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(13,42,33,.8);
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--silver);
  white-space:nowrap;
}
.tag--lime{color:var(--lime);border-color:var(--lime-deep)}
.tag--amber{color:var(--amber);border-color:rgba(255,176,32,.5)}
.tag--pulse{color:var(--pulse);border-color:rgba(53,167,255,.5)}

/* ============ 7. PANELS & NOTES ============ */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  border-left:3px solid var(--lime);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,30px);
}
.panel--amber{border-left-color:var(--amber)}
.panel--pulse{border-left-color:var(--pulse)}

.note{
  padding:.85rem 1rem;
  background:rgba(13,42,33,.6);
  border:1px dashed var(--line);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:.74rem;
  line-height:1.7;
  color:var(--mist);
}

/* ============ 8. STATS ============ */
.stat{display:grid;gap:.2rem}
.stat__num{
  font-family:var(--font-mono);
  font-weight:600;
  font-size:clamp(1.6rem,3vw,2.6rem);
  line-height:1;
  color:var(--amber);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mist);
}

/* ============ 9. PROSE ============ */
.prose{max-width:68ch}
.prose p{margin-bottom:1.2em;line-height:1.72}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.9em 0 .6em}
.prose ul,.prose ol{padding-left:1.25em;margin-bottom:1.2em}
.prose li{margin-bottom:.45em}
.prose a{border-bottom:1px solid rgba(200,255,61,.4)}

/* ============ 10. BREADCRUMB ============ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5em;
  list-style:none;
  margin:0 0 clamp(16px,2vw,26px);
  padding:0;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.05em;
  color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:.5em}
.breadcrumb li + li::before{content:"/";color:var(--line);margin-right:.1em}
.breadcrumb a{color:var(--mist)}
.breadcrumb a:hover{color:var(--lime)}
.breadcrumb [aria-current="page"]{color:var(--silver)}

/* ============ 11. MEDIA FRAME ============ */
.media-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  background:linear-gradient(155deg,#0D2A21 0%,#071A14 72%);
  border:2px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-soft);
}
.media-frame::after{content:"";display:block;padding-top:62.5%}
.media-frame--wide::after{padding-top:48%}
.media-frame--tall::after{padding-top:118%}
.media-frame--square::after{padding-top:100%}
.media-frame > img,
.media-frame > svg,
.media-frame > video,
.media-frame > picture > img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  z-index:1;
}
.media-frame__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  padding:.7rem 1rem;
  background:linear-gradient(0deg,rgba(7,26,20,.94),rgba(7,26,20,0));
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  color:var(--silver);
}

/* ============ 12. SPLIT GRID ============ */
.grid-split{
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(24px,4vw,64px);
  align-items:start;
}
.grid-split--flip{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}

/* ============ 13. HEADER ============ */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:220;
  padding:.72em 1.1em;
  background:var(--lime);
  color:#08170F;
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:var(--radius);
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#08170F}

.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:120;
  height:var(--header-h);
  display:flex;
  align-items:center;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header.is-scrolled{
  background:rgba(7,26,20,.95);
  -webkit-backdrop-filter:saturate(140%) blur(12px);
  backdrop-filter:saturate(140%) blur(12px);
  border-bottom-color:var(--line);
  box-shadow:0 16px 36px rgba(0,0,0,.45);
}

.header-inner{
  position:relative;
  width:100%;
  height:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  display:flex;
  align-items:center;
  gap:clamp(14px,2vw,36px);
}

.brand{
  display:flex;
  flex-direction:column;
  gap:3px;
  flex:0 0 auto;
  color:var(--paper);
  text-decoration:none;
}
.brand:hover{color:var(--paper)}
.brand__mark{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.05rem,1.4vw,1.32rem);
  line-height:1.1;
  letter-spacing:-.01em;
  color:var(--paper);
}
.brand__mark::before{
  content:"";
  width:9px;height:9px;
  background:var(--lime);
  transform:rotate(45deg);
  box-shadow:0 0 0 3px rgba(200,255,61,.14);
  flex:0 0 auto;
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.14em;
  color:var(--mist);
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  width:44px;height:44px;
  padding:0;
  align-items:center;
  justify-content:center;
  background:transparent;
  border:2px solid var(--line);
  border-radius:var(--radius);
  cursor:pointer;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--lime)}
.nav-toggle__bars{display:grid;gap:5px;width:20px}
.nav-toggle__bars span{
  display:block;height:2px;width:100%;
  background:var(--paper);
  transition:transform .26s var(--ease),opacity .2s var(--ease),background .2s var(--ease);
}
.site-header[data-open="true"] .nav-toggle{
  border-color:var(--lime);
  background:rgba(200,255,61,.1);
}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(7px) rotate(45deg);background:var(--lime)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-7px) rotate(-45deg);background:var(--lime)}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(14px,2vw,32px);
  margin-left:auto;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.5vw,26px);
  list-style:none;
}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:.5em 0;
  font-size:.9rem;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--silver);
  white-space:nowrap;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--paper)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--lime)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__link--feature{color:var(--lime)}
.site-nav__link--feature:hover{color:var(--paper)}

.header-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.62em 1.05em;
  background:var(--lime);
  color:#08170F;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  white-space:nowrap;
  border:2px solid var(--lime);
  border-radius:var(--radius);
  box-shadow:3px 3px 0 rgba(7,26,20,.9);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.header-cta:hover{
  background:var(--lime-deep);
  border-color:var(--lime-deep);
  color:#06120C;
  transform:translate(-1px,-1px);
  box-shadow:4px 4px 0 rgba(7,26,20,.9);
}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(30,74,58,.55);
  overflow:hidden;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lime) 0%,var(--lime-deep) 55%,var(--pulse) 100%);
  transition:transform .12s linear;
}

/* ============ 14. FOOTER ============ */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,#08201A 0%,#050F0A 100%);
  border-top:2px solid var(--line);
  color:var(--silver);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-2px;left:0;
  width:min(40%,320px);
  height:2px;
  background:linear-gradient(90deg,var(--lime),rgba(200,255,61,0));
}
.footer-inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(40px,5.5vw,76px) var(--gutter) 0;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(200px,1.3fr) minmax(0,2.1fr) minmax(220px,1.2fr);
  gap:clamp(28px,4vw,64px);
  padding-bottom:clamp(32px,4vw,56px);
}

.footer-brand{display:grid;align-content:start;gap:.9rem}
.footer-brand__mark{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.35rem;
  letter-spacing:-.01em;
  color:var(--paper);
  justify-self:start;
}
.footer-brand__mark:hover{color:var(--lime)}
.footer-brand__mark::before{
  content:"";
  width:10px;height:10px;
  background:var(--lime);
  transform:rotate(45deg);
  flex:0 0 auto;
}
.footer-brand__line{
  font-size:.9rem;
  line-height:1.65;
  color:var(--silver);
  max-width:28ch;
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col__title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--lime);
}
.footer-list{list-style:none;display:grid;gap:.55rem}
.footer-list a{
  font-size:.9rem;
  color:var(--silver);
}
.footer-list a:hover{color:var(--lime)}

.footer-contact{
  display:grid;
  align-content:start;
  gap:.55rem;
  font-size:.88rem;
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
  margin-bottom:.2rem;
}
.footer-contact__line{
  font-family:var(--font-mono);
  font-size:.82rem;
  color:var(--paper);
  word-break:break-all;
  letter-spacing:.01em;
}
.footer-contact address{
  font-size:.82rem;
  line-height:1.65;
  color:var(--mist);
}
.footer-contact__note{
  margin-top:.35rem;
  padding-left:.75rem;
  border-left:2px solid var(--line);
  font-size:.74rem;
  line-height:1.7;
  color:var(--mist);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem 1.6rem;
  padding:1.15rem 0 1.5rem;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.05em;
  color:var(--mist);
}
.footer-copy{color:var(--mist)}
.footer-icp{color:var(--mist)}

/* ============ 15. MOTION HOOKS ============ */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-revealed{opacity:1;transform:none}

[data-chapter-link]{transition:color .2s var(--ease),border-color .2s var(--ease)}
[data-chapter-link].is-active{color:var(--lime)}

/* ============ 16. RESPONSIVE ============ */
@media (max-width:1120px) and (min-width:901px){
  .site-nav__list{gap:.7rem}
  .site-nav__link{font-size:.82rem}
  .header-cta{font-size:.64rem;padding:.55em .8em;letter-spacing:.06em}
  .brand__tag{display:none}
}

@media (max-width:900px){
  :root{--header-h:64px}

  .nav-toggle{display:inline-flex;margin-left:auto}
  .brand__tag{display:none}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    margin-left:0;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:.4rem var(--gutter) 1.4rem;
    background:rgba(7,26,20,.98);
    border-bottom:2px solid var(--line);
    box-shadow:0 28px 48px rgba(0,0,0,.55);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
  }
  .site-header[data-open="true"] .site-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
  }
  .site-nav__list > li + li{border-top:1px solid rgba(30,74,58,.75)}
  .site-nav__link{display:block;padding:.95rem 0;font-size:1rem}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--lime)}
  .header-cta{margin-top:1.1rem;width:100%;justify-content:center;padding:.9em 1em;font-size:.78rem}

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

@media (max-width:1040px){
  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,1.5fr)}
  .footer-contact{
    grid-column:1 / -1;
    border-top:1px solid var(--line);
    padding-top:1.6rem;
  }
}
@media (max-width:700px){
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-bottom{justify-content:flex-start}
}
@media (max-width:460px){
  .footer-nav{grid-template-columns:minmax(0,1fr)}
  .btn,.header-cta{width:100%}
}

/* ============ 17. 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;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .scroll-progress__bar{transition:none}
}