:root{
  --void:#120726;
  --void-2:#1C0F38;
  --lime:#C7FF3D;
  --sky:#37D7FF;
  --ember:#FF9B45;
  --wine:#4C1230;
  --teal:#0B3A3B;
  --indigo:#2A1B5E;
  --mist:#F5F1FF;
  --ash:#A99FC4;
  --line:rgba(169,159,196,.26);
  --line-soft:rgba(169,159,196,.16);
  --grid:rgba(169,159,196,.055);
  --font-mono:"Space Mono","JetBrains Mono","Noto Sans Mono SC",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --font-body:"Inter","Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --wrap:1280px;
  --rail:72px;
  --header-h:72px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

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

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

body{
  margin:0;
  background-color:var(--void);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(900px 520px at 82% -10%,rgba(55,215,255,.15),transparent 68%),
    radial-gradient(760px 440px at 6% 2%,rgba(199,255,61,.10),transparent 70%),
    linear-gradient(to right,var(--grid) 1px,transparent 1px),
    linear-gradient(to bottom,var(--grid) 1px,transparent 1px);
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  background-size:auto,auto,var(--rail) var(--rail),var(--rail) var(--rail);
}

img,svg{max-width:100%;display:block;height:auto}
figure{margin:0}
ul,ol{padding-left:0}

h1,h2,h3,h4{
  font-family:var(--font-mono);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--mist);
  margin:0 0 .6em;
  text-wrap:balance;
}
h1{font-size:clamp(2.2rem,4.4vw,3.5rem)}
h2{font-size:clamp(1.6rem,2.7vw,2.35rem)}
h3{font-size:clamp(1.15rem,1.7vw,1.4rem)}
h4{font-size:1.05rem}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}

a{color:var(--sky);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--lime)}

[id]{scroll-margin-top:calc(var(--header-h) + 26px)}

:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:0;
}

::selection{background:var(--lime);color:var(--void)}

.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;
}

.skip-link{
  position:fixed;top:0;left:0;z-index:300;
  transform:translateY(-130%);
  padding:12px 20px;
  background:var(--lime);
  color:var(--void);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  border:1px solid var(--lime);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--void)}

/* ============ 头部 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(18,7,38,.34);
  border-bottom:1px solid transparent;
  transition:background .38s var(--ease),border-color .38s var(--ease),box-shadow .38s var(--ease);
}
.site-header[data-stuck]{
  background:rgba(28,15,56,.97);
  border-bottom-color:var(--line);
  box-shadow:0 18px 44px rgba(6,2,16,.62);
}

.header-frame{
  position:relative;
  width:min(100% - 40px,var(--wrap));
  margin-inline:auto;
  min-height:var(--header-h);
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(14px,2vw,32px);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--mist);
  text-decoration:none;
  padding:6px 0;
}
.brand-mark{
  width:34px;height:34px;flex:none;
  background:
    linear-gradient(var(--lime),var(--lime)) 0 0/13px 13px no-repeat,
    linear-gradient(var(--sky),var(--sky)) 14px 14px/10px 10px no-repeat,
    linear-gradient(var(--ember),var(--ember)) 24px 0/10px 10px no-repeat,
    linear-gradient(var(--indigo),var(--indigo)) 0 24px/13px 10px no-repeat,
    linear-gradient(var(--void-2),var(--void-2)) 14px 0/10px 14px no-repeat;
  box-shadow:0 0 0 1px var(--line),inset 0 0 18px rgba(199,255,61,.28);
  transition:box-shadow .3s var(--ease);
}
.brand:hover .brand-mark{box-shadow:0 0 0 1px var(--lime),0 0 16px rgba(199,255,61,.45)}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{
  font-family:var(--font-mono);
  font-size:17px;
  letter-spacing:.06em;
  color:inherit;
  transition:color .2s var(--ease);
}
.brand:hover .brand-name{color:var(--lime)}
.brand-sub{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:var(--ash);
  text-transform:uppercase;
}

.header-edition{
  display:flex;
  align-items:center;
  gap:12px;
  margin:0;
  justify-self:end;
}
.mono{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--ash);
  text-transform:uppercase;
  white-space:nowrap;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  border:1px solid currentColor;
  white-space:nowrap;
}
.badge-lime{
  color:var(--lime);
  background:rgba(199,255,61,.08);
  box-shadow:inset 0 0 14px rgba(199,255,61,.18);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  background:transparent;
  color:var(--mist);
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime)}
.nav-toggle-bars{
  width:20px;height:12px;
  background:
    linear-gradient(var(--lime),var(--lime)) 0 0/20px 2px no-repeat,
    linear-gradient(var(--lime),var(--lime)) 0 5px/14px 2px no-repeat,
    linear-gradient(var(--lime),var(--lime)) 0 10px/20px 2px no-repeat;
  transition:background-image .2s var(--ease);
}
.nav-toggle[aria-expanded="true"]{border-color:var(--sky);color:var(--sky)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{
  background-image:
    linear-gradient(var(--sky),var(--sky)),
    linear-gradient(var(--sky),var(--sky)),
    linear-gradient(var(--sky),var(--sky));
  background-size:20px 2px,12px 2px,20px 2px;
  background-position:0 0,0 5px,0 10px;
  background-repeat:no-repeat;
}
.nav-toggle-label{white-space:nowrap}

.primary-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.5vw,24px);
  justify-self:end;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(8px,1.3vw,20px);
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:nav;
}
.nav-item{display:block}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:10px 2px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.05em;
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link::before{
  counter-increment:nav;
  content:counter(nav,decimal-leading-zero);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--sky);
}
.nav-link:hover,
.nav-link:focus-visible{color:var(--lime);border-bottom-color:var(--lime)}
.nav-link[aria-current="page"]{color:var(--lime);border-bottom-color:var(--lime)}
.nav-link[aria-current="page"]::before{color:var(--lime)}

.nav-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:9px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--void);
  background:var(--lime);
  border:1px solid var(--lime);
  text-decoration:none;
  white-space:nowrap;
  transition:background .22s var(--ease),color .22s var(--ease),box-shadow .22s var(--ease);
}
.nav-cta:hover{
  background:transparent;
  color:var(--lime);
  box-shadow:0 0 0 2px rgba(199,255,61,.3);
}

.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(169,159,196,.16);
  pointer-events:none;
}
.scroll-meter-fill{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--sky),var(--lime));
  box-shadow:0 0 12px rgba(199,255,61,.7);
}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:clamp(40px,6vw,80px);
  padding:clamp(40px,5.5vw,72px) 0 28px;
  background:linear-gradient(180deg,rgba(21,8,48,.4) 0%,#150830 34%,#100521 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background:linear-gradient(90deg,var(--lime) 0 120px,var(--sky) 120px 220px,transparent 220px);
  opacity:.8;
}

.footer-top{
  width:min(100% - 40px,var(--wrap));
  margin:0 auto;
  padding-bottom:26px;
  border-bottom:1px dashed var(--line-soft);
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 24px;
}
.footer-wordmark{
  margin:0;
  font-family:var(--font-mono);
  font-size:clamp(1.35rem,4.2vw,3.2rem);
  line-height:1;
  letter-spacing:.18em;
  color:rgba(199,255,61,.14);
  -webkit-text-stroke:1px rgba(199,255,61,.48);
  text-shadow:0 0 18px rgba(199,255,61,.32);
}
.footer-line{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--ash);
  white-space:nowrap;
}

.footer-inner{
  width:min(100% - 40px,var(--wrap));
  margin:0 auto;
  padding:34px 0;
  display:grid;
  grid-template-columns:minmax(0,5fr) minmax(0,7fr);
  gap:clamp(26px,4vw,64px);
}
.footer-brand{min-width:0}
.brand--footer .brand-name{font-size:19px;letter-spacing:.08em}
.footer-summary{
  margin:18px 0 0;
  max-width:38ch;
  color:var(--ash);
  font-size:15px;
  line-height:1.7;
}
.footer-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:18px;
}
.tag{
  display:inline-flex;
  align-items:center;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  border:1px solid currentColor;
  background:rgba(245,241,255,.03);
  white-space:nowrap;
}
.tag--lime{color:var(--lime)}
.tag--sky{color:var(--sky)}
.tag--ember{color:var(--ember)}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
  min-width:0;
}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 14px;
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--lime);
  border-bottom:1px solid var(--line-soft);
  text-transform:uppercase;
}
.footer-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:9px;
}
.footer-link{
  display:inline-block;
  color:var(--ash);
  font-size:15px;
  line-height:1.5;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible{color:var(--lime);border-bottom-color:var(--lime)}

.footer-contact{
  width:min(100% - 40px,var(--wrap));
  margin:0 auto;
  padding:24px 0;
  border-top:1px solid var(--line-soft);
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  justify-content:space-between;
  gap:20px 32px;
}
.contact-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:8px;
  min-width:0;
}
.contact-item{
  display:flex;
  flex-wrap:wrap;
  gap:4px 12px;
  font-size:14px;
  line-height:1.6;
}
.contact-label{
  min-width:72px;
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--sky);
}
.contact-value{color:var(--mist);overflow-wrap:anywhere}

.footer-meta{
  width:min(100% - 40px,var(--wrap));
  margin:0 auto;
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
}
.footer-legal{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ash);
}
.footer-meta-links{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:16px;
}
.footer-meta-links .footer-link{font-size:13px}

/* ============ 通用布局与组件 ============ */
.wrap{
  width:min(100% - 40px,var(--wrap));
  margin-inline:auto;
}

.section{
  position:relative;
  padding:clamp(44px,6vw,88px) 0;
  border-top:1px solid var(--line-soft);
}
.section--wine{background:var(--wine);border-top-color:rgba(245,241,255,.14)}
.section--teal{background:var(--teal);border-top-color:rgba(245,241,255,.14)}
.section--indigo{background:var(--indigo);border-top-color:rgba(245,241,255,.14)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--sky);
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--sky);
  flex:none;
}

.chapter{
  display:flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:8px 14px;
  margin:0 0 22px;
}
.chapter-no{
  font-family:var(--font-mono);
  font-size:clamp(1.05rem,1.6vw,1.35rem);
  letter-spacing:.14em;
  color:var(--lime);
  font-variant-numeric:tabular-nums;
}
.chapter-title{
  margin:0;
  font-size:clamp(1.5rem,2.6vw,2.1rem);
}

.panel{
  position:relative;
  padding:clamp(18px,2.4vw,30px);
  background:rgba(28,15,56,.72);
  border:1px solid var(--line);
}
.panel--corner::before,
.panel--corner::after{
  content:"";
  position:absolute;
  width:14px;height:14px;
  border:1px solid var(--lime);
  pointer-events:none;
}
.panel--corner::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.panel--corner::after{bottom:-1px;right:-1px;border-left:0;border-top:0}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.02em;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:48px;
  padding:0 22px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--void);
  background:var(--lime);
  border:1px solid var(--lime);
  text-decoration:none;
  cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),box-shadow .22s var(--ease);
}
.btn:hover,
.btn:focus-visible{
  background:var(--mist);
  border-color:var(--mist);
  color:var(--void);
  box-shadow:0 0 0 3px rgba(199,255,61,.24);
}
.btn--ghost{
  background:transparent;
  color:var(--mist);
  border-color:var(--line);
}
.btn--ghost:hover,
.btn--ghost:focus-visible{
  background:var(--mist);
  border-color:var(--mist);
  color:var(--void);
  box-shadow:none;
}
.btn--ember{
  background:var(--ember);
  border-color:var(--ember);
  color:#25120A;
}
.btn--ember:hover,
.btn--ember:focus-visible{
  background:transparent;
  color:var(--ember);
  box-shadow:0 0 0 2px rgba(255,155,69,.32);
}

.breadcrumb{
  width:min(100% - 40px,var(--wrap));
  margin:0 auto;
  padding:20px 0 0;
}
.breadcrumb-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ash);
}
.breadcrumb-list li+li::before{
  content:"/";
  margin-right:8px;
  color:rgba(169,159,196,.55);
}
.breadcrumb-link{color:var(--sky)}
.breadcrumb-link:hover{color:var(--lime)}
.breadcrumb-current{color:var(--mist)}

.grid{display:grid;gap:clamp(18px,2vw,32px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  background:
    linear-gradient(135deg,rgba(55,215,255,.2),transparent 58%),
    linear-gradient(315deg,rgba(199,255,61,.16),transparent 62%),
    var(--indigo);
}
.media-frame img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(18,7,38,.34) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(18,7,38,.34) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.45;
}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--screen{
  aspect-ratio:4/3;
  box-shadow:
    inset 0 0 0 1px rgba(55,215,255,.42),
    inset 0 0 48px rgba(55,215,255,.2);
}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--ash);
}

[data-reveal]{will-change:opacity}
[data-reveal].is-revealed{
  animation:reveal-in .55s var(--ease) both;
  animation-delay:calc(var(--reveal-i,0) * 60ms);
}
@keyframes reveal-in{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .grid--7-5,.grid--8-4{grid-template-columns:1fr}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:960px){
  .header-frame{
    grid-template-columns:auto auto;
    justify-content:space-between;
    gap:12px;
  }
  .header-edition{display:none}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;
    left:0;right:0;top:100%;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    justify-self:stretch;
    padding:0 20px;
    background:var(--void-2);
    border-block:1px solid var(--line);
    box-shadow:0 24px 48px rgba(6,2,16,.6);
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    transition:max-height .4s var(--ease),opacity .25s var(--ease),visibility .25s linear,padding .3s var(--ease);
  }
  .primary-nav[data-open]{
    max-height:80vh;
    overflow:auto;
    opacity:1;
    visibility:visible;
    padding:14px 20px 24px;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
  }
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:14px 2px;
    font-size:15px;
    border-bottom:1px solid var(--line-soft);
  }
  .nav-link::before{font-size:11px}
  .nav-cta{
    margin-top:18px;
    align-self:stretch;
    padding:14px 16px;
  }
}

@media (max-width:900px){
  .grid--3{grid-template-columns:1fr}
}

@media (max-width:720px){
  body{font-size:16px;background-size:auto,auto,48px 48px,48px 48px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-top{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-contact{flex-direction:column}
  .footer-meta{flex-direction:column;align-items:flex-start}
}

@media (max-width:520px){
  .header-frame{width:min(100% - 28px,var(--wrap))}
  .brand-name{font-size:15px}
  .brand-sub{font-size:9px;letter-spacing:.16em}
  .footer-grid{grid-template-columns:1fr}
  .footer-inner,.footer-top,.footer-contact,.footer-meta,.wrap,.breadcrumb{width:min(100% - 28px,var(--wrap))}
  .btn{width:100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal].is-revealed{animation:none}
  .site-header,.primary-nav,.scroll-meter-fill{transition:none}
}