:root{
  --ink-950:#05121F;
  --ink-900:#0A2033;
  --ink-800:#12324A;
  --rice:#F3EFE6;
  --mist:#8FA3AE;
  --stone:#5E6B70;
  --moss:#7F8F6B;
  --terracotta:#C47A52;
  --cyan:#39E6D0;
  --orange:#FF8C42;
  --line:rgba(143,163,174,.24);
  --line-strong:rgba(143,163,174,.44);
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-display:"Arial Narrow","Helvetica Neue","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,"Courier New",monospace;
  --header-h:76px;
  --max-w:1280px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background-color:var(--ink-950);
  background-image:
    linear-gradient(rgba(143,163,174,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,163,174,.055) 1px,transparent 1px);
  background-size:24px 24px,24px 24px;
  color:var(--rice);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{margin:0;font-weight:500;line-height:1.25;letter-spacing:-.01em;color:var(--rice)}
p{margin:0}
img{max-width:100%}
ul,ol{margin:0;padding:0}
a{color:inherit}
button{font:inherit}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 基础文字与排版 ---------- */
.display{font-family:var(--font-display);font-weight:300;font-size:clamp(2.6rem,7vw,6rem);line-height:1.04;letter-spacing:-.03em;color:var(--rice);margin:0}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.index-label{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--mist)}
.prose{max-width:34em}
.prose p{margin:0 0 1.1em;color:rgba(243,239,230,.86)}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.6em 0 .6em;color:var(--rice)}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.2em}
.prose li{margin:0 0 .4em;color:rgba(243,239,230,.86)}
.prose a{color:var(--cyan);text-decoration:none;border-bottom:1px solid rgba(57,230,208,.4);transition:border-color .16s var(--ease),color .16s var(--ease)}
.prose a:hover{border-bottom-color:var(--cyan)}
.prose strong{color:var(--rice);font-weight:500}

/* ---------- 容器与网格 ---------- */
.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px}
.grid{display:grid;gap:24px}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}
#main-content{padding-top:var(--header-h)}
#main-content.main-flush{padding-top:0}

/* ---------- 章节标记 ---------- */
.section-marker{display:flex;align-items:center;gap:12px;margin:0 0 20px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--mist)}
.section-marker::before{content:"";width:10px;height:10px;background:var(--cyan);flex:0 0 auto}
.section-marker-num{color:var(--rice)}
.section-marker-line{display:block;width:32px;height:1px;background:var(--line-strong)}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:18px 0;border-bottom:1px solid var(--line)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px;list-style:none;margin:0;padding:0;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--mist)}
.breadcrumb-list li{display:flex;align-items:center;gap:10px}
.breadcrumb-list li+li::before{content:"/";color:var(--stone)}
.breadcrumb-list a{color:var(--mist);text-decoration:none;transition:color .16s var(--ease)}
.breadcrumb-list a:hover,.breadcrumb-list a:focus-visible{color:var(--cyan)}
.breadcrumb-list [aria-current="page"]{color:var(--rice)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border:2px solid transparent;border-radius:0;background:transparent;color:var(--rice);font-family:var(--font-sans);font-size:14px;font-weight:500;line-height:1.2;text-decoration:none;cursor:pointer;transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink-950)}
.btn-primary:hover,.btn-primary:focus-visible{background:var(--rice);border-color:var(--rice);color:var(--ink-950);box-shadow:0 0 0 4px rgba(57,230,208,.18)}
.btn-ghost{border-color:var(--line-strong);color:var(--rice)}
.btn-ghost:hover,.btn-ghost:focus-visible{border-color:var(--cyan);color:var(--cyan);background:rgba(57,230,208,.08)}
.btn-accent{border-color:var(--orange);color:var(--orange)}
.btn-accent:hover,.btn-accent:focus-visible{background:var(--orange);border-color:var(--orange);color:var(--ink-950)}

/* ---------- 标签 ---------- */
.chip{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;border:1px solid var(--line-strong);background:transparent;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--mist)}
.chip--cyan{color:var(--cyan);border-color:rgba(57,230,208,.5);background:rgba(57,230,208,.08)}
.chip--orange{color:var(--orange);border-color:rgba(255,140,66,.5);background:rgba(255,140,66,.08)}
.chip--moss{color:var(--moss);border-color:rgba(127,143,107,.55);background:rgba(127,143,107,.1)}
.chip--terracotta{color:var(--terracotta);border-color:rgba(196,122,82,.55);background:rgba(196,122,82,.1)}

/* ---------- 复制版本号 ---------- */
.copy-btn{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border:1px solid rgba(57,230,208,.45);border-radius:0;background:rgba(57,230,208,.07);color:var(--cyan);font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;cursor:pointer;transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease)}
.copy-btn:hover,.copy-btn:focus-visible{background:rgba(57,230,208,.16);border-color:var(--cyan)}
.copy-btn[data-copied="true"]{border-color:var(--orange);color:var(--orange);background:rgba(255,140,66,.12)}

/* ---------- 图片容器 ---------- */
.media-frame{position:relative;display:block;border:1px solid var(--line-strong);background-color:var(--ink-800);overflow:hidden}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(57,230,208,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(57,230,208,.06) 1px,transparent 1px);background-size:24px 24px}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x5{aspect-ratio:4/5}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:9/16}

/* ---------- 页头 ---------- */
.skip-link{position:fixed;top:8px;left:8px;z-index:200;padding:10px 16px;background:var(--cyan);color:var(--ink-950);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-decoration:none;transform:translateY(-200%);transition:transform .18s var(--ease)}
.skip-link:focus{transform:none}
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background-color:transparent;border-bottom:1px solid transparent;transition:background-color .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease)}
.site-header[data-scrolled="true"]{background-color:rgba(10,32,51,.95);border-bottom-color:var(--line-strong);box-shadow:0 18px 40px -32px rgba(0,0,0,.9);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.header-inner{display:flex;align-items:center;gap:16px;width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px;height:var(--header-h)}
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;text-decoration:none;color:var(--rice)}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;border:2px solid var(--cyan);background:rgba(57,230,208,.08);color:var(--cyan);font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;transition:background-color .18s var(--ease),color .18s var(--ease)}
.brand:hover .brand-mark,.brand:focus-visible .brand-mark{background:var(--cyan);color:var(--ink-950)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:16px;font-weight:500;letter-spacing:.02em}
.brand-tagline{margin-top:3px;font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--mist)}
.status-chip{display:inline-flex;align-items:center;gap:8px;margin:0;padding:6px 10px;border:1px solid var(--line);color:var(--mist);font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;white-space:nowrap}
.status-dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);flex:0 0 auto}
.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none}
.nav-item{flex:0 0 auto}
.nav-link{position:relative;display:inline-flex;align-items:baseline;gap:6px;padding:10px 12px;color:rgba(243,239,230,.82);font-size:14px;text-decoration:none;transition:color .16s var(--ease)}
.nav-link::after{content:"";position:absolute;left:12px;right:12px;bottom:5px;height:1px;background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease)}
.nav-link:hover,.nav-link:focus-visible{color:var(--rice)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-index{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--stone);transition:color .16s var(--ease)}
.nav-link:hover .nav-index,.nav-link:focus-visible .nav-index{color:var(--orange)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-index{color:var(--orange)}
.nav-text{display:inline}
.nav-cta{display:none}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:12px}
.nav-toggle{display:none;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--line-strong);border-radius:0;background:transparent;color:var(--rice);font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;cursor:pointer;transition:border-color .18s var(--ease),color .18s var(--ease)}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bar{display:block;height:2px;width:100%;background:currentColor;transition:transform .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{display:inline-block;min-width:2.2em;text-align:left}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;pointer-events:none}
.scroll-progress-bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--orange));transition:width .12s linear}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;margin-top:80px;background-color:var(--ink-900);border-top:1px solid var(--line-strong)}
.site-footer::before{content:"";position:absolute;top:-2px;left:max(24px,calc((100% - var(--max-w))/2 + 24px));width:72px;height:4px;background:var(--cyan)}
.footer-inner{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,5fr) minmax(0,3fr);gap:48px;width:100%;max-width:var(--max-w);margin:0 auto;padding:64px 24px 48px}
.footer-brand{min-width:0}
.footer-mark{display:inline-grid;place-items:center;width:44px;height:44px;margin-bottom:16px;border:2px solid var(--cyan);color:var(--cyan);font-family:var(--font-mono);font-size:13px;letter-spacing:.04em}
.footer-name{margin:0 0 4px;font-size:20px;font-weight:500}
.footer-tagline{margin:0 0 16px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist)}
.footer-note{max-width:32em;margin:0;padding-top:16px;border-top:1px solid var(--line);font-size:13px;line-height:1.75;color:var(--mist)}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-group{min-width:0}
.footer-heading{display:flex;align-items:center;gap:8px;margin:0 0 14px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.14em;color:var(--cyan)}
.footer-heading::before{content:"";width:14px;height:2px;background:var(--orange);flex:0 0 auto}
.footer-list{display:flex;flex-direction:column;gap:10px;list-style:none}
.footer-list a{position:relative;display:inline-block;color:rgba(243,239,230,.78);font-size:14px;text-decoration:none;transition:color .16s var(--ease)}
.footer-list a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease)}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--rice)}
.footer-list a:hover::after,.footer-list a:focus-visible::after{transform:scaleX(1)}
.footer-contact{min-width:0}
.footer-address{display:flex;flex-direction:column;gap:10px;margin:0;font-style:normal}
.footer-contact-line{display:flex;flex-direction:column;gap:2px;margin:0;font-size:13px;line-height:1.6;color:var(--rice);word-break:break-word}
.footer-contact-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;color:var(--stone)}
.footer-contact-cta{margin:20px 0 0}
.footer-cta{padding:8px 14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;width:100%;max-width:var(--max-w);margin:0 auto;padding:18px 24px 28px;border-top:1px solid var(--line);font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;color:var(--mist)}
.legal-line{margin:0}
.legal-meta{margin:0;color:var(--stone)}

/* ---------- 响应式 ---------- */
@media (max-width:1120px){
  .status-chip{display:none}
}
@media (max-width:1024px){
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:899px){
  :root{--header-h:66px}
  .grid--12{grid-template-columns:minmax(0,1fr)}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:1 / -1}
  .header-actions{margin-left:auto}
  .header-actions .btn-primary{display:none}
  .nav-toggle{display:inline-flex}
  .primary-nav{position:fixed;top:var(--header-h);left:0;right:0;bottom:0;margin:0;padding:20px 24px 48px;background-color:var(--ink-950);background-image:linear-gradient(rgba(143,163,174,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(143,163,174,.06) 1px,transparent 1px);background-size:24px 24px,24px 24px;border-top:1px solid var(--line-strong);overflow-y:auto;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-6px);transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease)}
  .primary-nav[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-link{display:flex;align-items:baseline;gap:14px;padding:18px 4px;font-size:22px;font-weight:300;letter-spacing:-.01em;color:var(--rice)}
  .nav-link::after{display:none}
  .nav-index{font-size:11px}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .nav-cta{display:block;margin-top:24px}
  .nav-cta .btn{width:100%}
  html.nav-open{overflow:hidden}
}
@media (max-width:720px){
  .footer-inner{grid-template-columns:minmax(0,1fr);padding:48px 24px 36px;gap:32px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .site-footer::before{left:24px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .nav-link::after,.footer-list a::after{display:none}
  .btn:active{transform:none}
  .primary-nav{transform:none}
  .scroll-progress-bar{transition:none}
}