/* ============================================================
   银河1331 共享样式 /assets/site.css
   深空基底 · 精密网格 · 锐利直角 · 细线分层
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse}

/* ---------- 2. 变量 ---------- */
:root{
  --void:#070B18;
  --night:#0E1730;
  --nebula:#1B2440;
  --silver:#E8ECF5;
  --cyan:#4FE3D0;
  --cyan-deep:#2BA9A0;
  --amber:#E9A23B;
  --rock:#8A92A3;
  --moss:#7E8F63;
  --clay:#B5714F;
  --paper:#F3EFE6;
  --ink:#171B26;

  --line:rgba(232,236,245,.14);
  --line-soft:rgba(232,236,245,.07);
  --line-strong:rgba(232,236,245,.30);

  --rail-w:264px;
  --rail-h:64px;
  --gutter:clamp(20px,4vw,56px);
  --gap:24px;

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-head);
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --t:.16s;
}

/* ---------- 3. 基础排版与画布 ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  background:var(--void);
  color:var(--silver);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    radial-gradient(1100px 640px at 78% -10%,rgba(79,227,208,.10),transparent 62%),
    radial-gradient(820px 520px at 4% 96%,rgba(233,162,59,.07),transparent 60%),
    linear-gradient(to right,var(--line-soft) 1px,transparent 1px),
    linear-gradient(to bottom,var(--line-soft) 1px,transparent 1px);
  background-size:auto,auto,64px 64px,64px 64px;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.01em;
  color:var(--silver);
}
h1{font-size:clamp(34px,5vw,64px)}
h2{font-size:clamp(26px,3.6vw,42px)}
h3{font-size:clamp(20px,2.2vw,27px);font-weight:800}
h4{font-size:18px;font-weight:800}
p{max-width:34em}
strong{font-weight:800;color:#fff}
a{color:var(--cyan);transition:color var(--t) var(--ease)}
a:hover{color:var(--cyan-deep)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:rgba(79,227,208,.28);color:#fff}

.mono{font-family:var(--font-mono);letter-spacing:.02em;font-variant-numeric:tabular-nums}
.label{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.4;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--rock);
}
html[data-nav-lock],html[data-nav-lock] body{overflow:hidden}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  transform:translateY(-200%);
  background:var(--cyan);
  color:#04121A;
  padding:10px 16px;
  font:700 14px/1 var(--font-body);
  transition:transform var(--t) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 5. 头部：侧边轨道 / 移动顶栏 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  z-index:60;
  width:var(--rail-w);
  height:100vh;
  height:100dvh;
  background:var(--night);
  border-right:1px solid var(--line);
}
.rail{
  display:flex;
  flex-direction:column;
  height:100%;
  padding:22px 20px 20px;
  overflow-y:auto;
  overscroll-behavior:contain;
}

/* 品牌 */
.brand{
  display:flex;
  gap:12px;
  align-items:flex-start;
  padding-bottom:18px;
  border-bottom:1px solid var(--line);
  color:var(--silver);
}
.brand:hover{color:var(--silver)}
.brand__mark{
  flex:0 0 auto;
  width:26px;
  height:26px;
  margin-top:3px;
  border:1px solid var(--cyan);
  display:grid;
  place-items:center;
}
.brand__dot{
  width:8px;
  height:8px;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(79,227,208,.7);
}
.brand__text{display:flex;flex-direction:column;gap:4px;min-width:0}
.brand__line{
  font-family:var(--font-head);
  font-size:20px;
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.15;
}
.brand__sub{
  font-size:11.5px;
  line-height:1.5;
  letter-spacing:.04em;
  color:var(--rock);
}

/* 移动按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:0 12px;
  border:1px solid var(--line-strong);
  color:var(--silver);
  font:600 13px/1 var(--font-body);
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:1px;background:currentColor}

/* 导航 */
.site-nav{
  display:flex;
  flex-direction:column;
  flex:1 1 auto;
  min-height:0;
  padding-top:22px;
}
.site-nav__caption{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--rock);
  max-width:none;
}
.site-nav__list{display:flex;flex-direction:column}
.site-nav__item{border-bottom:1px solid var(--line)}
.site-nav__item:first-child{border-top:1px solid var(--line)}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:11px 2px 11px 12px;
  font-size:14.5px;
  font-weight:500;
  line-height:1.5;
  color:var(--silver);
  transition:color var(--t) var(--ease);
}
.site-nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:2px;
  background:var(--cyan);
  transform:scaleY(0);
  transform-origin:top;
  transition:transform var(--t) var(--ease);
}
.site-nav__link:hover{color:var(--cyan)}
.site-nav__link:hover .site-nav__index{color:var(--cyan-deep)}
.site-nav__link[aria-current="page"]{color:var(--cyan);font-weight:700}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--amber)}
.site-nav__link[aria-current="page"]::before{transform:scaleY(1)}
.site-nav__index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--rock);
  transition:color var(--t) var(--ease);
}
.site-nav__name{letter-spacing:.01em}

.rail__foot{
  margin-top:auto;
  padding-top:22px;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.rail__foot .btn{width:100%}
.rail__note{
  margin:2px 0 0;
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--rock);
}

/* 遮罩与进度条 */
.nav-scrim{display:none}
.rail-meter{
  position:absolute;
  top:0;
  right:0;
  width:2px;
  height:100%;
  background:rgba(232,236,245,.08);
  pointer-events:none;
}
.rail-meter__fill{
  display:block;
  width:100%;
  height:0;
  background:linear-gradient(180deg,var(--cyan),var(--cyan-deep));
  transition:height .12s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(64px,9vw,140px);
  background:var(--night);
  border-top:1px solid var(--line);
}
.footer-shell{
  width:min(1240px,100%);
  margin-inline:auto;
  padding:clamp(44px,6vw,80px) var(--gutter) 28px;
}
.footer-lead{
  display:flex;
  flex-wrap:wrap;
  gap:24px;
  align-items:flex-end;
  justify-content:space-between;
  padding-bottom:32px;
  border-bottom:1px solid var(--line);
}
.footer-brand{display:flex;flex-direction:column;gap:6px}
.footer-brand__line{
  font-family:var(--font-head);
  font-size:clamp(22px,2.4vw,28px);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.15;
}
.footer-brand__sub{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--rock);
}
.footer-lead__note{
  margin-top:10px;
  max-width:32em;
  font-size:14.5px;
  line-height:1.8;
  color:var(--rock);
}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:0 16px;
  border:1px solid var(--line-strong);
  color:var(--silver);
  font:600 13px/1 var(--font-body);
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease);
}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}
.to-top__arrow{font-family:var(--font-mono);font-size:14px}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:32px 28px;
  padding:36px 0;
  border-bottom:1px solid var(--line);
}
.footer-col__title{
  margin:0 0 14px;
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--rock);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14.5px;
  line-height:1.7;
  color:var(--silver);
  border-bottom:1px solid transparent;
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-item{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13.5px;
  line-height:1.7;
}
.footer-item__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--rock);
}
.footer-item__value{color:var(--silver);font-size:13.5px;word-break:break-all}
.footer-item--wide{flex-direction:column;align-items:flex-start;gap:6px}
.copy-btn{
  min-height:26px;
  padding:4px 8px;
  border:1px solid var(--line);
  color:var(--rock);
  font:500 11px/1.4 var(--font-mono);
  letter-spacing:.12em;
  cursor:pointer;
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.copy-btn[data-copied]{color:var(--moss);border-color:var(--moss)}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  gap:14px 28px;
  align-items:center;
  justify-content:space-between;
  padding-top:24px;
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  max-width:none;
  font-size:12px;
  color:var(--rock);
}
.footer-legal__sep{color:var(--line-strong)}
.footer-base__links{display:flex;flex-wrap:wrap;gap:8px 22px}
.footer-base__links .footer-link{font-size:13px;color:var(--rock)}
.footer-base__links .footer-link:hover{color:var(--cyan)}

/* ---------- 7. 容器与分区 ---------- */
.wrap{
  width:min(1240px,100%);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  padding-block:clamp(48px,7vw,96px);
  border-top:1px solid var(--line);
}
.section:first-of-type{border-top:0}
.section-head{display:flex;flex-direction:column;gap:12px;margin-bottom:36px}
.section-head__title{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.15;
  letter-spacing:-.01em;
}
.section-head__desc{
  margin:0;
  max-width:34em;
  font-size:16px;
  line-height:1.85;
  color:var(--rock);
}

/* ---------- 8. 网格 ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
  align-items:start;
}
.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-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* ---------- 9. 按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 18px;
  border:1px solid transparent;
  border-radius:0;
  font:600 15px/1 var(--font-body);
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.btn--cyan{background:var(--cyan);color:#04121A}
.btn--cyan:hover{background:var(--cyan-deep);color:#04121A}
.btn--line{border-color:var(--line-strong);color:var(--silver)}
.btn--line:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--amber{border-color:var(--amber);color:var(--amber)}
.btn--amber:hover{background:rgba(233,162,59,.12);color:var(--amber)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--line-strong);
  color:var(--rock);
  font:500 11.5px/1.4 var(--font-mono);
  letter-spacing:.12em;
}
.tag--cyan{color:var(--cyan);border-color:rgba(79,227,208,.45)}
.tag--amber{color:var(--amber);border-color:rgba(233,162,59,.45)}
.tag--moss{color:var(--moss);border-color:rgba(126,143,99,.5)}
.tag--clay{color:var(--clay);border-color:rgba(181,113,79,.5)}

/* ---------- 10. 资料卡 / 指标 ---------- */
.dossier{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:22px;
  background:var(--nebula);
  border:1px solid var(--line);
}
.dossier--float{box-shadow:0 18px 44px rgba(3,6,14,.55)}
.dossier__head{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:baseline;
  justify-content:space-between;
  padding-bottom:12px;
  border-bottom:1px solid var(--line);
}
.dossier__title{margin:0;font-size:17px;font-weight:800;letter-spacing:-.005em}
.dossier__meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--rock)}
.dossier__body{margin:0;max-width:34em;font-size:14.5px;line-height:1.8;color:var(--rock)}

.metric{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding-top:16px;
  border-top:1px solid var(--line);
}
.metric__value{
  font-family:var(--font-mono);
  font-size:clamp(22px,3vw,34px);
  line-height:1.1;
  letter-spacing:.01em;
  color:var(--cyan);
}
.metric__label{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--rock);
}
.metric--amber .metric__value{color:var(--amber)}

/* ---------- 11. 折叠面板 ---------- */
.fold{
  border:1px solid var(--line);
  border-bottom:0;
  background:var(--nebula);
}
.fold:last-child{border-bottom:1px solid var(--line)}
.fold__head{
  display:flex;
  gap:14px;
  align-items:baseline;
  justify-content:space-between;
  padding:16px 18px;
  cursor:pointer;
  font-size:15.5px;
  font-weight:800;
  line-height:1.6;
  list-style:none;
  transition:background-color var(--t) var(--ease);
}
.fold__head::-webkit-details-marker{display:none}
.fold__head::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:16px;
  line-height:1;
  color:var(--cyan);
}
.fold[open] .fold__head::after{content:"−"}
.fold__head:hover{background:rgba(79,227,208,.05)}
.fold__body{
  margin:0;
  padding:0 18px 20px;
  max-width:34em;
  font-size:15px;
  line-height:1.85;
  color:var(--rock);
}

/* ---------- 12. 对照表 ---------- */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  background:var(--nebula);
}
.data-table{width:100%;min-width:640px;font-size:14.5px}
.data-table th,.data-table td{
  padding:14px 16px;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid var(--line);
}
.data-table thead th{
  position:sticky;
  top:0;
  z-index:2;
  background:var(--night);
  color:var(--rock);
  font:500 11.5px/1.5 var(--font-mono);
  letter-spacing:.16em;
  text-transform:uppercase;
  white-space:nowrap;
}
.data-table tbody tr:hover{background:rgba(79,227,208,.05)}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table .mono,.data-table .num{font-family:var(--font-mono);font-size:13.5px;letter-spacing:.02em}
.price{font-family:var(--font-mono);letter-spacing:.02em;color:var(--amber)}

/* ---------- 13. 章节索引与面包屑 ---------- */
.toc{
  display:flex;
  flex-wrap:wrap;
  gap:10px 22px;
  align-items:center;
  padding:16px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.toc__title{
  margin:0;
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--rock);
}
.toc__link{
  position:relative;
  padding-left:14px;
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:.06em;
  color:var(--silver);
  transition:color var(--t) var(--ease);
}
.toc__link::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:5px;
  height:1px;
  background:var(--rock);
  transition:width var(--t) var(--ease),background-color var(--t) var(--ease);
}
.toc__link:hover{color:var(--cyan)}
.toc__link[data-active],.toc__link[aria-current="true"]{color:var(--cyan)}
.toc__link[data-active]::before,.toc__link[aria-current="true"]::before{width:10px;background:var(--cyan)}

.breadcrumb{margin-bottom:24px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
}
.breadcrumb__item{display:flex;align-items:center;gap:10px}
.breadcrumb__link{color:var(--rock)}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__sep{color:var(--line-strong)}

/* ---------- 14. 米白阅读区 ---------- */
.paper{
  padding:clamp(24px,4vw,48px);
  background:var(--paper);
  color:var(--ink);
  border:1px solid rgba(7,11,24,.14);
}
.paper h2,.paper h3,.paper h4{color:#0B0F1A}
.paper p{color:#2A3140;max-width:34em}
.paper a{color:#0F6E68;border-bottom:1px solid rgba(15,110,104,.35)}
.paper a:hover{color:#0B4F4A}
.paper .label{color:#6B7280}
.paper .mono{color:#0B0F1A}

/* ---------- 15. 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  background:
    linear-gradient(160deg,var(--nebula) 0%,var(--night) 46%,var(--void) 100%);
  border:1px solid var(--line);
}
.media img,.media video{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media--wide{aspect-ratio:21 / 9}
.media--square{aspect-ratio:1 / 1}
.media--tall{aspect-ratio:3 / 4}
.media__cap{
  display:block;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.6;
  letter-spacing:.1em;
  color:var(--rock);
}

/* ---------- 16. 入场与动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .2s ease-out,transform .2s ease-out;
}
[data-reveal][data-in]{opacity:1;transform:none}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1180px){
  :root{--rail-w:232px;--gap:20px}
}

@media (max-width:960px){
  :root{--rail-w:0px}
  body{padding-left:0;padding-top:var(--rail-h)}
  .site-header{
    width:100%;
    height:auto;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .rail{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    height:var(--rail-h);
    padding:0 var(--gutter);
    overflow:visible;
  }
  .brand{padding-bottom:0;border-bottom:0;align-items:center}
  .brand__mark{margin-top:0}
  .brand__sub{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;
    top:var(--rail-h);
    left:0;
    right:0;
    bottom:0;
    z-index:2;
    display:none;
    flex:0 0 auto;
    padding:24px var(--gutter) 48px;
    background:var(--void);
    border-top:1px solid var(--line);
    overflow-y:auto;
  }
  .site-header[data-open] .site-nav{display:flex}
  .site-nav__item:first-child{border-top:0}
  .site-nav__link{padding:14px 2px 14px 14px;font-size:17px}
  .rail__foot{padding-top:28px}
  .rail__foot .btn{width:100%}

  .nav-scrim{
    display:none;
    position:fixed;
    top:var(--rail-h);
    left:0;
    right:0;
    bottom:0;
    z-index:1;
    background:rgba(7,11,24,.72);
  }
  .site-header[data-open] .nav-scrim{display:block}
  .rail-meter{display:none}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-lead{align-items:flex-start}
  .span-3,.span-4,.span-5,.span-6,.span-8{grid-column:span 12}
}

@media (max-width:600px){
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-base{flex-direction:column;align-items:flex-start}
  .to-top{width:100%;justify-content:space-between}
  .span-3,.span-4,.span-5,.span-6,.span-8,.span-12{grid-column:span 12}
}

/* ---------- 18. 无障碍与减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .rail-meter__fill{transition:none}
}