:root{
  --ink-900:#0A1520;
  --ink-800:#101F2E;
  --line-700:#1D3145;
  --green-900:#123A2C;
  --green-500:#2FBF71;
  --green-300:#6FF2B0;
  --orange-500:#FF7A1A;
  --amber-500:#FFC24B;
  --silver-200:#C3D0DE;
  --silver-500:#7C8FA3;
  --white-100:#F4F8FC;
  --steel-700:#2A3A4B;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --measure:34em;
  --gutter:clamp(16px,5vw,24px);
  --gap:24px;
  --ease:220ms cubic-bezier(.2,.6,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--silver-200);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
h1,h2,h3,h4,h5{
  color:var(--white-100);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.01em;
  font-stretch:condensed;
}
h1{font-size:36px}
h2{font-size:28px}
h3{font-size:22px}
h4{font-size:18px}
ul,ol{list-style:none;margin:0;padding:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
strong,b{color:var(--white-100);font-weight:700}
small{font-size:14px}
hr,.rule{border:0;border-top:1px solid var(--line-700);margin:0}
::selection{background:var(--green-500);color:#08131d}
:focus-visible{outline:2px solid var(--green-300);outline-offset:2px}

.num{
  font-family:var(--font-mono);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;
  font-size:1.05em;
  color:var(--white-100);
}
.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;
}

/* ============ 布局容器 ============ */
.wrap{
  width:100%;
  max-width:1200px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,96px);border-top:1px solid var(--line-700)}
.section:first-of-type{border-top:0}
.section__head{margin-bottom:clamp(24px,3vw,40px)}
.kicker{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:14px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--green-500);
  margin-bottom:10px;
}
.section__title{font-size:clamp(26px,3.4vw,32px);max-width:22em}
.lede{
  max-width:var(--measure);
  font-size:18px;
  color:var(--silver-200);
  margin-top:14px;
}
.prose{max-width:var(--measure);font-size:17px;line-height:1.85}
.prose p+p{margin-top:1.2em}
.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul{margin-top:1em}
.prose li{position:relative;padding-left:1.2em;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.85em;width:8px;height:1px;background:var(--green-500)}

.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap)}
.g-4{grid-column:span 4}
.g-6{grid-column:span 6}
.g-8{grid-column:span 8}

/* ============ 面板与指标 ============ */
.panel{
  background:var(--ink-800);
  border:1px solid var(--line-700);
  padding:clamp(16px,2vw,24px);
}
.panel--green{background:var(--green-900);border-color:#1B5140}
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(28px,4vw,36px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.03em;
  color:var(--white-100);
  font-variant-numeric:tabular-nums;
}
.stat__label{font-size:14px;color:var(--silver-500)}
.tag{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  padding:2px 8px;
  border:1px solid var(--line-700);
  color:var(--silver-500);
  white-space:nowrap;
}
.tag--live{border-color:var(--amber-500);color:var(--amber-500)}
.tag--green{border-color:var(--green-500);color:var(--green-300)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  font-size:16px;
  font-weight:700;
  letter-spacing:0;
  border:1px solid var(--line-700);
  background:var(--ink-800);
  color:var(--white-100);
  border-radius:0;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.btn:hover{border-color:var(--green-500);color:var(--green-300)}
.btn--signal{background:var(--orange-500);border-color:var(--orange-500);color:#08131d}
.btn--signal:hover{background:var(--amber-500);border-color:var(--amber-500);color:#08131d}
.btn--ghost{background:transparent}

/* ============ 面包屑 ============ */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--silver-500)}
.breadcrumb__link{color:var(--silver-500)}
.breadcrumb__link:hover{color:var(--green-300)}
.breadcrumb__sep{color:var(--steel-700)}
.breadcrumb__current{color:var(--silver-200)}

/* ============ 图片容器基础规则 ============ */
.figure{margin:0;border:1px solid var(--line-700);background:var(--ink-800)}
.figure__media{
  position:relative;
  aspect-ratio:16 / 9;
  overflow:hidden;
  background-color:var(--ink-800);
  background-image:
    linear-gradient(var(--line-700) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-700) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__caption{
  padding:10px 14px;
  font-size:14px;
  line-height:1.7;
  color:var(--silver-500);
  border-top:1px solid var(--line-700);
}
.figure--tall .figure__media{aspect-ratio:3 / 4}
.figure--wide .figure__media{aspect-ratio:21 / 9}

/* ============ 左侧竖向章节刻度 ============ */
.rail{display:none}

/* ============ 显现 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity var(--ease),transform var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ============ 头部 ============ */
.skip-link{
  position:absolute;
  left:12px;
  top:-72px;
  z-index:200;
  padding:10px 16px;
  background:var(--orange-500);
  color:#08131d;
  font-weight:700;
  transition:top 160ms ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:var(--ink-900);
  border-bottom:1px solid var(--line-700);
}
.progress-rail{position:absolute;left:0;top:0;width:100%;height:2px;overflow:hidden}
.progress-rail__bar{
  display:block;
  width:100%;
  height:100%;
  background:var(--orange-500);
  transform:scaleX(0);
  transform-origin:0 50%;
}
.header-inner{
  width:100%;
  max-width:1200px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.masthead{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,32px);
  padding-block:14px;
  border-bottom:1px solid var(--line-700);
  transition:padding var(--ease);
}
.masthead__brand{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin-inline-end:auto;
  padding-left:12px;
  border-left:2px solid var(--green-500);
}
.masthead__name{
  font-size:22px;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--white-100);
  font-stretch:condensed;
}
.masthead__name-en{
  font-family:var(--font-mono);
  font-size:14px;
  letter-spacing:.18em;
  color:var(--green-500);
  margin-left:.25em;
}
.masthead__tagline{font-size:14px;line-height:1.5;color:var(--silver-500)}
.masthead__side{display:flex;flex-direction:column;gap:0;text-align:right}
.masthead__stat,.masthead__stage{font-size:14px;line-height:1.6;color:var(--silver-500);margin:0;white-space:nowrap}
.masthead__jump{white-space:nowrap;font-size:14px;padding:8px 14px}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid var(--line-700);
  color:var(--silver-200);
  font-size:14px;
}
.nav-toggle__bar{
  display:block;
  width:14px;
  height:1px;
  background:var(--green-500);
  box-shadow:0 -4px 0 var(--green-500),0 4px 0 var(--green-500);
}
.nav-toggle[aria-expanded="true"]{border-color:var(--green-500);color:var(--green-300)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar{box-shadow:none;background:var(--orange-500);width:16px}
.nav-toggle__label{font-weight:700}
.nav{border-bottom:1px solid var(--line-700)}
.nav__list{display:flex;align-items:stretch;gap:clamp(10px,2.2vw,30px);overflow-x:auto}
.nav__item{flex:0 0 auto}
.nav__link{
  display:inline-block;
  padding:12px 2px;
  font-size:16px;
  font-weight:700;
  color:var(--silver-200);
  border-bottom:2px solid transparent;
  white-space:nowrap;
  transition:color var(--ease),border-color var(--ease),padding var(--ease),font-size var(--ease);
}
.nav__link:hover{color:var(--white-100);border-bottom-color:var(--green-500)}
.nav__link[aria-current="page"]{color:var(--white-100);border-bottom-color:var(--green-500)}

.site-header[data-condensed] .masthead{padding-block:6px}
.site-header[data-condensed] .masthead__tagline,
.site-header[data-condensed] .masthead__side{display:none}
.site-header[data-condensed] .nav__link{padding:8px 2px;font-size:14px}
.site-header[data-condensed]:hover .masthead{padding-block:14px}
.site-header[data-condensed]:hover .masthead__tagline{display:block}
.site-header[data-condensed]:hover .masthead__side{display:flex}
.site-header[data-condensed]:hover .nav__link{padding:12px 2px;font-size:16px}
.site-header[data-condensed]:focus-within .masthead__tagline{display:block}
.site-header[data-condensed]:focus-within .nav__link{padding:12px 2px;font-size:16px}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:clamp(56px,8vw,104px);
  background:var(--ink-800);
  border-top:1px solid var(--line-700);
  padding-block:clamp(40px,5vw,64px) 24px;
}
.footer-inner{
  width:100%;
  max-width:1200px;
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.site-footer > .footer-inner:first-child{
  display:grid;
  grid-template-columns:minmax(220px,1.1fr) 2.6fr;
  gap:clamp(24px,4vw,56px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-brand__name{
  font-size:22px;
  font-weight:700;
  color:var(--white-100);
  letter-spacing:-.01em;
  padding-left:12px;
  border-left:2px solid var(--green-500);
}
.footer-brand__line{font-size:14px;line-height:1.75;color:var(--silver-500);max-width:26em}
.footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(16px,2vw,32px)}
.footer-col{min-width:0}
.footer-col__title{
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--white-100);
  padding-bottom:8px;
  margin-bottom:10px;
  border-bottom:1px solid var(--line-700);
}
.footer-col__list li{margin-bottom:8px}
.footer-link{
  font-size:15px;
  color:var(--silver-200);
  border-bottom:1px solid transparent;
  transition:color var(--ease),border-color var(--ease);
}
.footer-link:hover{color:var(--green-300);border-bottom-color:var(--green-500)}
.footer-term{font-size:15px;color:var(--silver-500)}
.footer-term--mono{font-family:var(--font-mono);font-size:14px;color:var(--silver-200);word-break:break-all}
.footer-scale{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:12px 16px;
  margin-top:clamp(28px,3vw,40px);
  padding-top:14px;
  border-top:1px solid var(--line-700);
}
.footer-scale__legend{font-size:14px;color:var(--silver-500);margin:0;white-space:nowrap}
.footer-scale__rail{
  flex:1 1 160px;
  height:10px;
  border-bottom:1px solid var(--line-700);
  background-image:repeating-linear-gradient(to right,var(--steel-700) 0 1px,transparent 1px 16px);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 24px;
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid var(--line-700);
}
.footer-bottom__line,.footer-note{font-size:14px;color:var(--silver-500);margin:0}

/* ============ 响应式 ============ */
@media (min-width:1100px){
  .rail{
    display:flex;
    flex-direction:column;
    gap:12px;
    position:sticky;
    top:120px;
    align-self:start;
  }
  .rail__tick{
    width:1px;
    height:22px;
    background:var(--steel-700);
    transition:background var(--ease),height var(--ease);
  }
  .rail__tick[data-active]{background:var(--green-500);height:34px}
}

@media (max-width:1024px){
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:28px}
  .site-footer > .footer-inner:first-child{grid-template-columns:1fr}
}

@media (max-width:900px){
  .masthead__side{display:none}
  .masthead__tagline{display:none}
  .nav-toggle{display:inline-flex}
  .nav{display:none}
  .nav[data-open="true"]{display:block}
  .nav__list{flex-direction:column;gap:0;overflow:visible}
  .nav__item{flex:1 1 auto}
  .nav__link{
    display:block;
    padding:14px 4px;
    font-size:16px;
    border-bottom:1px solid var(--line-700);
    border-left:2px solid transparent;
    padding-left:12px;
  }
  .nav__link:hover{border-bottom-color:var(--line-700);background:var(--steel-700)}
  .nav__link[aria-current="page"]{
    border-bottom-color:var(--line-700);
    border-left-color:var(--green-500);
    background:var(--steel-700);
  }
  .site-header[data-condensed] .masthead{padding-block:10px}
  .site-header[data-condensed] .nav__link,.site-header[data-condensed]:hover .nav__link{padding:14px 4px;font-size:16px}
  .g-4,.g-6,.g-8{grid-column:span 12}
  .grid{gap:20px}
}

@media (max-width:640px){
  body{font-size:16px}
  .footer-cols{grid-template-columns:1fr}
  .g-4,.g-6,.g-8{grid-column:span 12}
  .masthead{gap:10px;padding-block:10px}
  .masthead__name{font-size:18px}
  .masthead__jump{padding:7px 10px;font-size:14px}
  .figure__media{aspect-ratio:4 / 3}
  .footer-scale__rail{flex-basis: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;
  }
  .reveal{opacity:1;transform:none}
}