*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h,64px) + 18px)}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,address{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}

:root{
  --ink-950:#06130F;
  --ink-900:#0A141B;
  --ink-800:#0B211A;
  --ink-700:#14352B;
  --line:#2E5A4B;
  --cyan:#63F5C8;
  --mint:#C8FFEA;
  --orange:#FF8C42;
  --slate:#8EA9BC;
  --paper:#F4FAF7;
  --shell:1440px;
  --gutter:clamp(16px,3.2vw,40px);
  --header-h:66px;
  --gap:clamp(16px,2vw,28px);
  --font-display:"Noto Sans SC","Source Han Sans SC","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

body{
  min-height:100vh;
  background-color:var(--ink-950);
  background-image:
    linear-gradient(to right,rgba(46,90,75,.18) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(46,90,75,.18) 1px,transparent 1px);
  background-size:72px 72px;
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--cyan);color:var(--ink-950)}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.14;
  color:var(--paper);
}
h1{font-size:clamp(34px,5.4vw,68px);line-height:1.02;letter-spacing:-.045em}
h2{font-size:clamp(25px,3.1vw,42px);line-height:1.1}
h3{font-size:clamp(19px,1.8vw,26px);line-height:1.24}

a{color:var(--cyan);text-decoration:none;transition:color .18s ease,border-color .18s ease,background-color .18s ease}
a:hover{color:var(--mint);text-decoration:underline;text-underline-offset:.22em}
strong{font-weight:700;color:var(--paper)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
#main-content:focus{outline:none}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ---------- 容器与分栏 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
#main-content{display:block;padding-block:clamp(24px,3.6vw,52px) 0}
.layout-split{
  display:grid;
  grid-template-columns:minmax(190px,3fr) minmax(0,9fr);
  gap:clamp(20px,3vw,52px);
  align-items:start;
}
.axis-column{position:sticky;top:calc(var(--header-h) + 18px)}
.panel-column{min-width:0}

/* ---------- 通用面板与标签 ---------- */
.panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  padding:clamp(16px,2vw,26px);
  position:relative;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-size:11px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;
  color:var(--slate);
}
.eyebrow::before{content:"";width:14px;height:2px;background:var(--cyan);flex:none}
.tag{
  display:inline-block;
  padding:2px 9px;
  background:var(--mint);
  color:var(--ink-950);
  font-family:var(--font-mono);
  font-size:11px;font-weight:700;letter-spacing:.06em;
  line-height:1.6;
  vertical-align:middle;
}
.tag--signal{background:var(--orange);color:#1A0D04}

/* ---------- 正文 ---------- */
.prose{max-width:76ch;font-size:17px;line-height:1.78;color:rgba(244,250,247,.86)}
.prose p+p{margin-top:1.05em}
.prose h2{margin-top:2em;margin-bottom:.6em;font-size:clamp(23px,2.5vw,34px)}
.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul,.prose ol{margin-top:1em;padding-left:1.2em;list-style:disc}
.prose li+li{margin-top:.5em}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--slate);
  margin-bottom:clamp(18px,2vw,28px);
}
.breadcrumb li{display:flex;align-items:center;gap:6px}
.breadcrumb li+li::before{content:"/";color:var(--line);margin-right:0}
.breadcrumb a{color:var(--slate);border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--cyan);border-bottom-color:var(--cyan);text-decoration:none}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:9px 18px;
  font-family:var(--font-body);font-size:13px;font-weight:700;letter-spacing:.08em;
  color:var(--paper);
  background:transparent;
  border:1px solid var(--line);border-radius:0;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{background:var(--ink-700);border-color:var(--cyan);color:var(--paper);text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn-signal{background:var(--orange);border-color:var(--orange);color:#1A0D04}
.btn-signal:hover{background:#FFA463;border-color:#FFA463;color:#1A0D04}
.btn-ghost{color:var(--cyan);border-color:var(--cyan);background:rgba(99,245,200,.06)}
.btn-ghost:hover{background:rgba(99,245,200,.16);color:var(--mint);border-color:var(--cyan)}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;display:block;margin:0;overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--line);
  aspect-ratio:16/9;
}
.media-frame>img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.04)}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(150deg,rgba(99,245,200,.12),transparent 44%,rgba(255,140,66,.10));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-caption{
  display:block;margin-top:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--slate);
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:-120px;z-index:120;
  padding:10px 20px;
  background:var(--cyan);color:var(--ink-950);
  font-size:14px;font-weight:700;letter-spacing:.04em;
  border:0;text-decoration:none;
  transition:top .2s ease;
}
.skip-link:focus{top:8px;color:var(--ink-950);text-decoration:none}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(6,19,15,.95);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  color:var(--paper);
}
.header-bar{
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(10px,1.6vw,28px);
}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;color:var(--paper);text-decoration:none}
.brand:hover{color:var(--paper);text-decoration:none}
.brand-glyph{
  width:34px;height:34px;flex:none;
  display:grid;place-items:center;
  background:var(--cyan);color:var(--ink-950);
  font-family:var(--font-display);font-weight:900;font-size:18px;line-height:1;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brand-stack{display:flex;flex-direction:column;line-height:1.12}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:15px;letter-spacing:.01em;white-space:nowrap}
.brand-sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;color:var(--slate);white-space:nowrap;text-transform:uppercase}

.primary-nav{justify-self:center;min-width:0}
.nav-index{display:flex;align-items:center;gap:2px}
.nav-index a{
  display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 11px;
  font-size:14px;font-weight:500;letter-spacing:.02em;
  color:var(--slate);
  border-bottom:2px solid transparent;
  transition:color .18s ease,background-color .18s ease,border-color .18s ease;
}
.nav-index a:hover{color:var(--paper);background:var(--ink-700);text-decoration:none}
.nav-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--line);transition:color .18s ease}
.nav-index a:hover .nav-num{color:var(--cyan)}
.nav-index a[aria-current="page"]{
  color:var(--cyan);
  background:rgba(99,245,200,.07);
  border-bottom-color:var(--cyan);
}
.nav-index a[aria-current="page"] .nav-num{color:var(--cyan)}

.header-meta{display:flex;align-items:center;gap:10px;justify-self:end}
.window-badge{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 10px;
  border:1px solid var(--line);
  background:var(--ink-800);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;
  color:var(--slate);white-space:nowrap;
}
.window-dot{
  width:6px;height:6px;flex:none;background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,140,66,.18);
  animation:dot-pulse 3.4s ease-in-out infinite;
}
@keyframes dot-pulse{0%,100%{opacity:1}50%{opacity:.35}}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;
  background:var(--ink-800);
  border:1px solid var(--line);
  color:var(--paper);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  cursor:pointer;
  transition:color .18s ease,border-color .18s ease;
}
.nav-toggle:hover{color:var(--cyan);border-color:var(--cyan)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px;flex:none}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:1.5px;background:currentColor;
  transition:transform .22s ease,top .22s ease;
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.site-header[data-open] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}
.site-header[data-open] .nav-toggle{color:var(--cyan);border-color:var(--cyan)}

.scroll-meter{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transform:scaleX(0);transform-origin:0 50%;
  pointer-events:none;will-change:transform;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,7vw,110px);
  background:linear-gradient(180deg,var(--ink-900),var(--ink-950) 72%);
  border-top:1px solid var(--line);
  color:var(--paper);
}
.site-footer::before{
  content:"";display:block;height:3px;
  background:linear-gradient(90deg,var(--cyan),rgba(99,245,200,.18) 42%,var(--orange));
}
.footer-grid{
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(36px,4.6vw,68px) var(--gutter) clamp(26px,3vw,40px);
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1.4fr;
  gap:clamp(22px,3vw,48px);
}
.footer-brand{min-width:0}
.footer-mark{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(19px,2vw,24px);letter-spacing:-.02em;line-height:1.2;
  color:var(--paper);
}
.footer-line{
  margin-top:10px;
  font-size:14px;font-weight:600;letter-spacing:.1em;
  color:var(--cyan);
}
.footer-note{
  margin-top:12px;max-width:34ch;
  font-size:13px;line-height:1.72;
  color:var(--slate);
}
.footer-time{
  margin-top:14px;
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--slate);
}
.footer-dot{
  width:6px;height:6px;flex:none;background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,140,66,.16);
}
.footer-title{
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;
  color:var(--slate);
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.footer-nav{min-width:0}
.footer-list li+li{margin-top:9px}
.footer-list a{
  display:inline-block;
  font-size:14px;color:rgba(244,250,247,.82);
  border-bottom:1px solid transparent;
}
.footer-list a:hover{color:var(--cyan);border-bottom-color:var(--cyan);text-decoration:none}
.footer-contact{min-width:0}
.footer-address p{
  display:flex;gap:10px;
  font-size:13px;line-height:1.66;
  color:rgba(244,250,247,.82);
}
.footer-address p+p{margin-top:9px}
.footer-key{
  flex:none;min-width:38px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--line);padding-top:3px;
}
.footer-legal{
  max-width:var(--shell);margin-inline:auto;
  padding:16px var(--gutter) 26px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--slate);
}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal-links a{color:var(--slate)}
.footer-legal-links a:hover{color:var(--cyan);text-decoration:none}
.footer-icp{white-space:nowrap}
.footer-copy{white-space:nowrap}

/* ---------- 响应式 ---------- */
@media (max-width:1200px){
  .nav-index a{padding:9px 8px;font-size:13px}
  .brand-sub{display:none}
}
@media (max-width:1040px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  :root{--header-h:60px}
  .header-bar{grid-template-columns:minmax(0,1fr) auto;min-height:60px;padding-block:8px}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    max-height:0;overflow:hidden;visibility:hidden;
    background:var(--ink-800);
    border-bottom:1px solid var(--line);
    transition:max-height .3s ease,visibility .3s ease;
    z-index:61;
  }
  .site-header[data-open] .primary-nav{max-height:min(72vh,620px);overflow-y:auto;visibility:visible}
  .nav-index{flex-direction:column;align-items:stretch;gap:0;padding:6px var(--gutter) 20px}
  .nav-index li:first-child a{border-top:1px solid var(--line)}
  .nav-index a{
    display:flex;justify-content:flex-start;
    padding:14px 6px;font-size:15px;
    border-bottom:1px solid var(--line);
    border-left:2px solid transparent;
  }
  .nav-index a[aria-current="page"]{
    border-bottom-color:var(--line);
    border-left-color:var(--cyan);
    padding-left:14px;
    background:rgba(99,245,200,.08);
  }
  .nav-toggle{display:inline-flex}
  .window-badge{display:none}
  .layout-split{grid-template-columns:minmax(0,1fr)}
  .axis-column{position:static;top:auto}
  body{background-attachment:scroll}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:10px}
  .btn{padding:8px 14px;font-size:12px;letter-spacing:.06em}
  .brand-glyph{width:30px;height:30px;font-size:16px}
  body{font-size:16px}
}

/* ---------- 动效降级 ---------- */
@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-meter{transition:none}
  .window-dot{animation:none}
}