:root{
  --ink:#04140F;
  --ink-2:#0A2119;
  --mint:#3FF0C4;
  --orange:#FF7A2F;
  --blue:#2AD2FF;
  --lime:#C8FF4D;
  --paper:#ECFAF4;
  --mute:#8FAFA4;
  --line:#1C4A3C;
  --orange-bg:#3A1B0C;
  --maxw:1240px;
  --pad:clamp(16px,4vw,40px);
  --rail-top:148px;
  --font-sans:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-serif:"Songti SC","Noto Serif SC","Source Han Serif SC",Georgia,"SimSun",serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --font-mark:"Arial Narrow","Helvetica Neue",system-ui,var(--font-sans);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg{display:block;max-width:100%}
main{display:block}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(63,240,196,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(63,240,196,.045) 1px,transparent 1px);
  background-size:72px 72px;
  background-position:center top;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:600;line-height:1.28;letter-spacing:.01em}
h1{font-size:clamp(28px,4.6vw,44px)}
h2{font-size:clamp(24px,3.4vw,38px)}
h3{font-size:clamp(18px,2.2vw,22px)}
p{overflow-wrap:break-word}
::selection{background:var(--mint);color:var(--ink)}

/* ---------- 容器与文本 ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.prose{max-width:38ch}
.prose p+p{margin-top:1.05em}
.lede{max-width:38ch;font-size:clamp(16px,1.9vw,19px);line-height:1.72;color:var(--paper)}
.kicker{display:block;margin-bottom:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--mint)}
.meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--mute)}
.num{font-family:var(--font-mono);font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.display-num{font-family:var(--font-mono);font-weight:800;font-variant-numeric:tabular-nums;font-size:clamp(56px,12vw,140px);line-height:.9;letter-spacing:-.04em;color:var(--mint)}
.hairline{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 跳转链接 ---------- */
.skip-link{position:absolute;left:12px;top:-120px;z-index:120;padding:10px 16px;background:var(--mint);color:var(--ink);font-size:13px;font-weight:700;letter-spacing:.04em;transition:top .18s ease}
.skip-link:focus{top:12px}
#main-content{scroll-margin-top:160px}

/* ---------- 页头 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--ink);border-bottom:1px solid var(--line)}
.scroll-progress{position:absolute;left:0;bottom:-1px;height:2px;width:0;background:linear-gradient(90deg,var(--mint),var(--blue));transition:width .12s linear}
.header-inner{width:100%;max-width:var(--maxw);margin-inline:auto;padding:14px var(--pad) 0}
.imprint{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.imprint-side{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mute);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.imprint-side--end{text-align:right}
.masthead{font-family:var(--font-mark);font-weight:800;font-size:clamp(22px,3.4vw,30px);letter-spacing:.06em;color:var(--paper);padding:2px 10px;position:relative}
.masthead::after{content:"";position:absolute;left:10px;right:10px;bottom:-2px;height:2px;background:linear-gradient(90deg,var(--mint),var(--blue));transform:scaleX(0);transform-origin:center;transition:transform .2s ease}
.masthead:hover::after{transform:scaleX(1)}
.nav-bar{position:relative;display:flex;align-items:center;gap:12px;padding-block:8px}
.nav-toggle{display:none;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--line);color:var(--paper);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.nav-toggle-label{white-space:nowrap}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;right:0;height:2px;background:var(--mint);transition:transform .2s ease,top .2s ease,bottom .2s ease}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{bottom:4px;transform:rotate(-45deg)}
.nav-scroll{flex:1;min-width:0;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.nav-scroll::-webkit-scrollbar{display:none}
.nav-list{display:flex;align-items:center;justify-content:center;gap:clamp(4px,1.6vw,18px);min-width:max-content;margin-inline:auto}
.nav-link{display:block;position:relative;padding:9px 6px;font-size:14px;color:var(--mute);white-space:nowrap;transition:color .18s ease}
.nav-link::after{content:"";position:absolute;left:50%;right:50%;bottom:2px;height:2px;background:var(--mint);transition:left .22s ease,right .22s ease}
.nav-link:hover{color:var(--paper)}
.nav-link:hover::after{left:6px;right:6px}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"]::after{left:6px;right:6px;background:var(--orange)}
.nav-quick{flex:0 0 auto;padding:8px 14px;border:1px solid var(--mint);color:var(--mint);font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;white-space:nowrap;transition:background .18s ease,color .18s ease}
.nav-quick:hover{background:var(--mint);color:var(--ink)}

/* ---------- 页脚 ---------- */
.site-footer{margin-top:clamp(56px,8vw,104px);border-top:1px solid var(--line);background:var(--ink-2)}
.footer-inner{max-width:var(--maxw);margin-inline:auto;padding:clamp(28px,5vw,56px) var(--pad) clamp(20px,4vw,32px)}
.footer-top{display:grid;grid-template-columns:minmax(220px,1fr) minmax(0,1.8fr);gap:clamp(20px,4vw,48px);padding-bottom:26px;border-bottom:1px solid var(--line)}
.footer-brand{font-family:var(--font-mark);font-weight:800;font-size:24px;letter-spacing:.06em;color:var(--paper)}
.footer-note{margin-top:10px;max-width:36ch;font-size:13px;line-height:1.7;color:var(--mute)}
.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:24px}
.footer-title{margin-bottom:12px;font-family:var(--font-mono);font-size:12px;font-weight:400;letter-spacing:.14em;text-transform:uppercase;color:var(--mint)}
.footer-list li+li{margin-top:8px}
.footer-list a{font-size:14px;color:var(--paper);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.footer-list a:hover{color:var(--mint);border-bottom-color:var(--mint)}
.footer-contact{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}
.contact-item{font-size:14px}
.contact-key{display:block;margin-bottom:4px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--mute)}
.contact-value{color:var(--paper);word-break:break-word}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;padding-top:20px;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--mute)}
.footer-icp{color:var(--mute)}
.footer-updated{color:var(--mute)}
.legal-links{display:flex;gap:18px}
.legal-links a{color:var(--mute);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.legal-links a:hover{color:var(--mint);border-bottom-color:var(--mint)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border:1px solid var(--mint);background:transparent;color:var(--mint);font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;transition:background .18s ease,color .18s ease,border-color .18s ease}
.btn:hover{background:var(--mint);color:var(--ink)}
.btn--solid{border-color:var(--orange);background:var(--orange);color:var(--ink);font-weight:700}
.btn--solid:hover{border-color:var(--paper);background:var(--paper);color:var(--ink)}
.btn--ghost{border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{border-color:var(--mint);background:transparent;color:var(--mint)}

/* ---------- 标签与状态 ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid currentColor;font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.08em;color:var(--mute)}
.tag--blue{color:var(--blue);background:rgba(42,210,255,.1)}
.tag--orange{color:var(--orange);background:var(--orange-bg)}
.tag--lime{color:var(--lime);background:rgba(200,255,77,.08)}
.tag--mint{color:var(--mint);background:rgba(63,240,196,.08)}
.status-dot{display:inline-block;width:7px;height:7px;background:var(--lime);animation:bb-pulse 1.6s ease-in-out infinite}
@keyframes bb-pulse{0%,100%{opacity:1}50%{opacity:.32}}

/* ---------- 卡片 ---------- */
.card{position:relative;padding:clamp(16px,2.4vw,26px);background:var(--ink-2);border:1px solid var(--line)}
.card::before{content:"";position:absolute;left:0;top:0;height:2px;width:100%;background:var(--mint);transform:scaleX(0);transform-origin:left center;transition:transform .18s ease}
.card:hover::before{transform:scaleX(1)}
.card--data{padding:clamp(18px,2.6vw,30px)}
.card--note{border-left:2px solid var(--orange);background:linear-gradient(180deg,rgba(255,122,47,.09),rgba(10,33,25,1) 58%)}

/* ---------- 章节头 ---------- */
.section-head{margin-bottom:clamp(18px,3vw,32px);padding-bottom:12px;border-bottom:1px solid var(--line)}
.section-head h2{color:var(--paper)}
.section-head p{margin-top:8px;max-width:60ch;font-size:14px;color:var(--mute)}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;margin-bottom:20px;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--mute)}
.breadcrumb li{margin-right:16px;position:relative}
.breadcrumb li+li::before{content:"/";position:absolute;left:-11px;color:var(--line)}
.breadcrumb a{transition:color .18s ease}
.breadcrumb a:hover{color:var(--mint)}

/* ---------- 侧栏锚点 ---------- */
.anchor-nav{display:flex;flex-direction:column;gap:10px;font-size:14px}
.anchor-nav a{display:block;padding:4px 0 4px 12px;border-left:2px solid var(--line);color:var(--mute);transition:color .18s ease,border-color .18s ease}
.anchor-nav a:hover{color:var(--mint);border-left-color:var(--mint)}

/* ---------- 图位容器 ---------- */
.media-frame{position:relative;display:block;width:100%;overflow:hidden;border:1px solid var(--line);
  background-color:var(--ink-2);
  background-image:
    linear-gradient(135deg,rgba(63,240,196,.1),rgba(4,20,15,0) 58%),
    repeating-linear-gradient(45deg,rgba(28,74,60,.6) 0 1px,transparent 1px 10px);
}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(63,240,196,.13) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(63,240,196,.13) 1px,transparent 1px);
  background-size:40px 40px;
}
.media-frame img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}

/* ---------- 布局骨架 ---------- */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,2vw,24px)}
.rail-layout{display:grid;grid-template-columns:minmax(200px,240px) minmax(0,1fr);gap:clamp(20px,3vw,40px);align-items:start}
.rail-sticky{position:sticky;top:var(--rail-top)}

/* ---------- 显现动画 ---------- */
.has-js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .rail-layout{grid-template-columns:minmax(0,1fr)}
  .rail-sticky{position:static;top:auto}
}
@media (max-width:880px){
  :root{--rail-top:auto}
  .header-inner{padding-top:10px}
  .imprint{grid-template-columns:minmax(0,1fr);gap:4px;padding-bottom:10px;text-align:center}
  .imprint-side,.imprint-side--end{text-align:center;font-size:11px;white-space:normal}
  .masthead{order:-1;padding-inline:0}
  .nav-bar{justify-content:space-between;gap:8px;padding-block:6px}
  .nav-toggle{display:inline-flex}
  .nav-scroll{position:absolute;left:0;right:0;top:100%;max-height:72vh;overflow-y:auto;background:var(--ink-2);border-top:1px solid var(--line);border-bottom:1px solid var(--mint);opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .2s ease,transform .2s ease,visibility .2s linear;z-index:70}
  .nav-scroll[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;justify-content:flex-start;min-width:0;margin:0;padding:4px 0;gap:0}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-item:last-child{border-bottom:0}
  .nav-link{padding:14px var(--pad);font-size:15px}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--mint);background:rgba(63,240,196,.06)}
  .footer-top{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:520px){
  .nav-quick{padding:7px 10px;font-size:11px;letter-spacing:.02em}
  .footer-legal{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .status-dot{animation:none}
  .has-js [data-reveal]{opacity:1;transform:none}
  .scroll-progress{transition:none}
}