:root{
  --ink-900:#07130F;
  --ink-800:#0E231C;
  --ink-700:#173B30;
  --cyan:#29E0C2;
  --teal:#0B7A67;
  --orange:#FF6B35;
  --paper:#F5F2EA;
  --paper-white:#FFFFFF;
  --line:#C9C4B7;
  --ink:#111A16;
  --muted:#6D766F;
  --on-dark:rgba(245,242,234,.74);
  --on-dark-strong:#F5F2EA;
  --font-display:"Smiley Sans","得意黑","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --maxw:1440px;
  --gutter:clamp(18px,4vw,56px);
  --gap:24px;
  --header-h:97px;
  --dur:220ms;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dd,fieldset{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video,picture{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

:where(a,button,[tabindex]):focus-visible{outline:3px solid var(--teal);outline-offset:3px}
.site-header :where(a,button):focus-visible,
.site-footer :where(a,button):focus-visible{outline-color:var(--cyan)}

body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--ink);
}
p{text-wrap:pretty}
::selection{background:var(--cyan);color:var(--ink-900)}

.sr-only{
  position:absolute;width:1px;height:1px;
  padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);
  white-space:nowrap;border:0;
}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}

main{padding-top:var(--header-h)}
.hero-overlay{
  margin-top:calc(var(--header-h) * -1);
  padding-top:calc(var(--header-h) + clamp(28px,5vw,64px));
}

.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.span-1{grid-column:span 1}
.span-2{grid-column:span 2}
.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-9{grid-column:span 9}
.span-10{grid-column:span 10}
.span-11{grid-column:span 11}
.span-12{grid-column:span 12}

.stack{display:grid;gap:16px}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.rule{height:1px;background:var(--line);border:0}

/* ---------- 文本层级 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(38px,6vw,76px);
  line-height:1.02;
  letter-spacing:-.025em;
}
.lead{
  font-size:clamp(17px,1.7vw,20px);
  line-height:1.7;
  color:var(--ink);
  max-width:58ch;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.7em;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--teal);
}
.eyebrow::before{content:"";width:18px;height:2px;background:currentColor}
.eyebrow--dark{color:var(--cyan)}
.annotation{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  line-height:1.9;
  color:var(--muted);
}
.annotation--vertical{writing-mode:vertical-rl;text-orientation:mixed;letter-spacing:.22em}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  min-height:44px;
  padding:0 18px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1;
  text-align:center;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--cyan);color:var(--ink-900);border-color:var(--cyan)}
.btn-primary:hover{background:var(--paper-white);border-color:var(--paper-white)}
.btn-ghost{background:transparent;color:var(--cyan);border-color:rgba(41,224,194,.55)}
.btn-ghost:hover{background:rgba(41,224,194,.14);border-color:var(--cyan)}
.btn-quiet{background:var(--ink-900);color:var(--paper);border-color:var(--ink-900)}
.btn-quiet:hover{background:var(--ink-700);border-color:var(--ink-700)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 面板 ---------- */
.panel{
  background:var(--paper-white);
  border:1px solid var(--line);
  border-radius:2px;
  padding:clamp(18px,2.4vw,28px);
}
.panel--dark{
  background:var(--ink-800);
  border-color:rgba(41,224,194,.24);
  color:var(--on-dark-strong);
}
.panel-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  padding-bottom:12px;
  border-bottom:1px solid var(--line);
}
.panel--dark .panel-head{border-bottom-color:rgba(41,224,194,.24)}
.panel-title{
  font-family:var(--font-display);
  font-size:clamp(20px,2.2vw,26px);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.2;
}

/* ---------- 编号章节 ---------- */
.section-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:start;
  gap:clamp(14px,2vw,28px);
}
.section-num{
  font-family:var(--font-mono);
  font-size:clamp(28px,4vw,44px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--orange);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(26px,3.4vw,42px);
  font-weight:900;
  line-height:1.06;
  letter-spacing:-.02em;
}

/* ---------- 数据带 ---------- */
.data-strip{
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:minmax(0,1fr);
  border:1px solid rgba(41,224,194,.28);
  background:var(--ink-800);
  color:var(--paper);
  border-radius:2px;
}
.data-cell{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:16px 18px;
  border-left:1px solid rgba(41,224,194,.18);
  min-width:0;
}
.data-cell:first-child{border-left:0}
.data-value{
  font-family:var(--font-mono);
  font-size:clamp(22px,3vw,34px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--orange);
  font-variant-numeric:tabular-nums;
}
.data-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--on-dark);
}

/* ---------- 正文 / 提示 / 标签 ---------- */
.prose{max-width:68ch}
.prose>*+*{margin-top:1.1em}
.prose h2{font-size:clamp(24px,2.6vw,32px);margin-top:1.9em}
.prose h3{font-size:clamp(19px,2vw,24px);margin-top:1.6em}
.prose a{color:var(--teal);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose ul li{position:relative;padding-left:1.3em;margin-top:.4em}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.7em;
  width:6px;height:6px;background:var(--teal);
}
.tip{
  border:1px solid var(--line);
  border-left:3px solid var(--teal);
  background:var(--paper-white);
  padding:14px 18px;
  font-size:15px;
  line-height:1.75;
  color:var(--ink);
}
.tag{
  display:inline-flex;
  align-items:center;
  min-height:26px;
  padding:0 10px;
  border:1px solid var(--line);
  border-radius:2px;
  background:var(--paper-white);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}
.tag--live{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900)}
.tag--alert{background:var(--orange);border-color:var(--orange);color:var(--paper-white)}

/* ---------- 面包屑 ---------- */
.crumb{border-bottom:1px solid var(--line);padding-block:14px}
.crumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--muted);
}
.crumb-item{display:inline-flex;align-items:center;gap:8px}
.crumb-item::after{content:"/";color:var(--line)}
.crumb-item:last-child::after{content:none}
.crumb-link:hover{color:var(--teal)}
.crumb-current{color:var(--ink)}

/* ---------- 图片容器 ---------- */
.figure{display:grid;gap:10px}
.figure-media{
  position:relative;
  overflow:hidden;
  border-radius:2px;
  background:var(--ink-800);
  aspect-ratio:16/9;
}
.figure-media > img,
.figure-media > picture,
.figure-media > svg{width:100%;height:100%;object-fit:cover}
.figure-media--tall{aspect-ratio:3/4}
.figure-media--wide{aspect-ratio:21/9}
.figure-media--square{aspect-ratio:1/1}
.figure-media--ph{
  background-color:var(--ink-800);
  background-image:
    linear-gradient(rgba(41,224,194,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(41,224,194,.16) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure-caption{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
}

/* ---------- 分段切换 ---------- */
.tabs{display:block}
.tablist{
  display:flex;
  gap:0;
  border-bottom:1px solid var(--line);
  overflow-x:auto;
  scrollbar-width:thin;
}
.tab{
  min-height:44px;
  padding:0 16px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  white-space:nowrap;
  color:var(--muted);
  border-bottom:2px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--teal)}
.tab-panel{padding-top:20px}
.tab-panel[data-active]{animation:panelIn 240ms var(--ease)}
@keyframes panelIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- 显现动画 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ============================================================
   头部
   ============================================================ */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  background:var(--cyan);
  color:var(--ink-900);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  border-radius:2px;
  transform:translateY(-160%);
  transition:transform 180ms var(--ease);
}
.skip-link:focus-visible{transform:none;outline-color:var(--paper-white)}

.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:90;
  color:var(--paper);
  background:linear-gradient(to bottom,rgba(7,19,15,.88),rgba(7,19,15,0));
  border-bottom:1px solid transparent;
  transition:background-color 260ms var(--ease),border-color 260ms var(--ease);
}
.site-header.is-scrolled,
html.nav-open .site-header{
  background-color:var(--ink-900);
  border-bottom-color:var(--cyan);
}

.header-rail{
  height:30px;
  background:var(--ink-900);
  border-bottom:1px solid rgba(41,224,194,.28);
  color:rgba(245,242,234,.66);
}
.rail-inner{
  display:flex;
  align-items:center;
  gap:10px;
  height:100%;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  white-space:nowrap;
  overflow:hidden;
}
.rail-dot{
  width:6px;height:6px;
  flex:0 0 auto;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(41,224,194,.16);
}
.rail-text{color:rgba(245,242,234,.8)}
.rail-sep{
  width:14px;height:1px;
  flex:0 0 auto;
  background:rgba(41,224,194,.5);
}
.rail-meta{color:var(--cyan)}

.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  height:66px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  min-height:44px;
}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:38px;height:38px;
  flex:0 0 auto;
  background:var(--cyan);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.02em;
  border-radius:2px;
}
.brand-copy{display:grid;gap:3px}
.brand-name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:900;
  line-height:1;
  letter-spacing:.01em;
  color:var(--paper-white);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.22em;
  line-height:1;
  color:rgba(245,242,234,.6);
}
.brand-tagline{
  flex:0 0 auto;
  padding-left:12px;
  border-left:1px solid rgba(41,224,194,.35);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:rgba(245,242,234,.62);
  white-space:nowrap;
}

.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(4px,1.5vw,24px)}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 2px;
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  white-space:nowrap;
  color:rgba(245,242,234,.8);
  transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:8px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.nav-link:hover{color:var(--paper-white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-cta{display:none}

.header-tools{
  display:flex;
  align-items:center;
  gap:12px;
  margin-left:clamp(8px,1.5vw,20px);
  flex:0 0 auto;
}
.header-cta{font-size:13px;padding:0 16px}

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:44px;height:44px;
  padding:0 10px;
  border:1px solid rgba(41,224,194,.4);
  border-radius:2px;
  background:rgba(7,19,15,.35);
}
.nav-toggle-bar{
  display:block;
  width:100%;height:2px;
  background:var(--cyan);
  transition:transform 220ms var(--ease),opacity 160ms var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(41,224,194,.14);
  pointer-events:none;
}
.scroll-meter-bar{
  display:block;
  width:100%;height:100%;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
}

html.nav-open{overflow:hidden}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  background:var(--ink-900);
  color:var(--on-dark-strong);
  border-top:1px solid var(--cyan);
  overflow:hidden;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,4.5fr) minmax(0,7.5fr);
  gap:clamp(32px,5vw,72px);
  padding-block:clamp(44px,7vw,84px) clamp(32px,5vw,56px);
}
.footer-eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--cyan);
}
.footer-wordmark{
  margin-top:16px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(46px,7vw,84px);
  line-height:.94;
  letter-spacing:-.03em;
  color:var(--paper);
}
.footer-wordmark span{display:block}
.wordmark-outline{color:var(--cyan)}
@supports (-webkit-text-stroke:1px #000){
  .wordmark-outline{color:transparent;-webkit-text-stroke:1.5px var(--cyan)}
}
.footer-summary{
  margin-top:20px;
  max-width:34ch;
  font-size:15px;
  line-height:1.8;
  color:var(--on-dark);
}
.footer-brand .btn{margin-top:26px}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,3vw,32px);
  align-content:start;
}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  line-height:1.6;
  color:var(--cyan);
  padding-bottom:12px;
  border-bottom:1px solid rgba(245,242,234,.16);
}
.footer-links{margin-top:12px;display:grid;gap:2px}
.footer-link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  font-size:15px;
  color:var(--on-dark);
  transition:color var(--dur) var(--ease);
}
.footer-link:hover{color:var(--cyan)}

.footer-contact{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:20px;
  padding-block:clamp(20px,3vw,30px);
  border-top:1px solid rgba(245,242,234,.12);
}
.contact-item{display:grid;gap:6px;min-width:0}
.contact-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:rgba(41,224,194,.92);
}
.contact-value{
  font-size:15px;
  line-height:1.6;
  color:var(--paper);
  word-break:break-word;
}
.contact-note{
  grid-column:1/-1;
  max-width:82ch;
  font-size:13px;
  line-height:1.75;
  color:rgba(245,242,234,.58);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  padding-block:20px clamp(24px,4vw,34px);
  border-top:1px solid rgba(245,242,234,.12);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:rgba(245,242,234,.6);
}
.footer-fine{line-height:1.7}
.footer-icp{color:rgba(245,242,234,.78)}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:18px;
  margin-left:auto;
}
.footer-legal-link{color:rgba(245,242,234,.72);transition:color var(--dur) var(--ease)}
.footer-legal-link:hover{color:var(--cyan)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .brand-tagline{display:none}
}
@media (max-width:1080px){
  .header-cta{display:none}
}
@media (max-width:960px){
  :root{--header-h:85px;}
  .header-rail{height:26px}
  .rail-inner{font-size:10px;letter-spacing:.12em;gap:8px}
  .header-inner{height:58px}
  .brand-mark{width:34px;height:34px;font-size:10px}
  .brand-name{font-size:17px}

  .nav-toggle{display:flex}
  .site-nav{
    position:fixed;
    left:0;right:0;
    top:var(--header-h);
    bottom:0;
    z-index:80;
    margin-left:0;
    padding:8px var(--gutter) 48px;
    background:var(--ink-900);
    border-top:1px solid rgba(41,224,194,.24);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-8px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;counter-reset:navi}
  .nav-item{
    counter-increment:navi;
    border-bottom:1px solid rgba(245,242,234,.1);
  }
  .nav-link{
    width:100%;
    min-height:62px;
    padding:0;
    font-family:var(--font-display);
    font-size:24px;
    font-weight:900;
    letter-spacing:-.01em;
    color:var(--paper);
  }
  .nav-link::before{
    content:counter(navi,decimal-leading-zero);
    font-family:var(--font-mono);
    font-size:12px;
    font-weight:600;
    letter-spacing:.14em;
    color:var(--orange);
    margin-right:14px;
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .nav-cta{
    display:inline-flex;
    width:100%;
    margin-top:28px;
  }

  .footer-top{grid-template-columns:minmax(0,1fr);gap:40px}
  .footer-col-title{padding-bottom:10px}
  .data-strip{grid-auto-flow:row;grid-auto-columns:auto}
  .data-cell{border-left:0;border-top:1px solid rgba(41,224,194,.18)}
  .data-cell:first-child{border-top:0}
}
@media (max-width:760px){
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 20px}
  .footer-contact{grid-template-columns:minmax(0,1fr)}
  .footer-legal{margin-left:0;width:100%}
  .annotation--vertical{writing-mode:horizontal-tb;letter-spacing:.14em}
  .section-head{grid-template-columns:minmax(0,1fr);gap:10px}
}
@media (max-width:480px){
  .rail-meta,.rail-sep{display:none}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-wordmark{font-size:clamp(40px,13vw,60px)}
}

@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;
  }
  .js [data-reveal]{opacity:1!important;transform:none!important}
}