/* ============================================================
   6163银河国 · 共享样式 /assets/site.css
   深空观测站视觉体系：深空底、银河银字、星云紫定位光、
   暖橙注册行动、青灰旧版通道。
   ============================================================ */

:root{
  --void:#05070F;
  --deep:#0B1220;
  --panel:#111A2B;
  --silver:#E8ECF5;
  --silver-dim:#A7B0C4;
  --nebula:#A88BFA;
  --orange:#FF9D4D;
  --orange-hi:#FFB070;
  --orange-ink:#26160A;
  --legacy:#7E9AA6;
  --paper:#F2EFE6;
  --ink:#121722;
  --moss:#7F936B;
  --clay:#B9795F;
  --line:rgba(232,236,245,.13);
  --line-2:rgba(232,236,245,.28);
  --font-head:'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',sans-serif;
  --font-mono:'IBM Plex Mono','JetBrains Mono','SFMono-Regular',Consolas,monospace;
  --max:1440px;
  --gutter:clamp(18px,4vw,56px);
  --header-h:74px;
  --ease:cubic-bezier(.2,.6,.2,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  background:var(--void);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  background:transparent;
  color:var(--silver);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  isolation:isolate;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    radial-gradient(ellipse 70% 55% at 84% -10%, rgba(168,139,250,.18), transparent 62%),
    radial-gradient(ellipse 60% 45% at 2% 2%, rgba(126,154,166,.13), transparent 70%),
    linear-gradient(rgba(232,236,245,.042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,236,245,.042) 1px, transparent 1px);
  background-size:auto,auto,72px 72px,72px 72px;
  background-position:center top,left top,-1px -1px,-1px -1px;
}
body>main{flex:1 0 auto}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure{margin:0}
hr{border:0}
::selection{background:rgba(168,139,250,.32);color:#fff}
:focus-visible{outline:2px solid var(--nebula);outline-offset:2px}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px);outline:none}

/* ---------- 中文排版 ---------- */
:where(h1,h2,h3,h4){
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.14;
  letter-spacing:-.03em;
  color:var(--silver);
  text-wrap:balance;
}
h1{font-size:clamp(2.2rem,4.4vw,4rem);letter-spacing:-.04em}
h2{font-size:clamp(1.6rem,2.8vw,2.5rem)}
h3{font-size:clamp(1.1rem,1.6vw,1.4rem);letter-spacing:-.02em}
h4{font-size:1.02rem;letter-spacing:-.01em}
p{max-width:76ch}

/* ---------- 布局工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(30px,5vw,72px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:18px;
  padding-bottom:16px;
  margin-bottom:clamp(20px,3vw,36px);
  border-bottom:1px solid var(--line);
}
.rule{height:1px;background:var(--line);width:100%}
.stack{display:grid;gap:clamp(12px,1.8vw,22px)}
.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.track{
  display:grid;
  grid-template-columns:minmax(0,2.6fr) minmax(0,9.4fr);
  gap:clamp(16px,3vw,48px);
  padding-block:clamp(20px,3vw,38px);
  border-top:1px solid var(--line);
}
.track__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  line-height:1.9;
  color:var(--nebula);
  text-transform:uppercase;
}

/* ---------- 文本组件 ---------- */
.mono{font-family:var(--font-mono);letter-spacing:.06em}
.eyebrow{
  display:block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--nebula);
  margin-bottom:12px;
}
.display{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(2.6rem,7vw,6.8rem);
  line-height:.98;
  letter-spacing:-.045em;
  color:var(--silver);
}
.lead{
  font-size:clamp(1rem,1.35vw,1.18rem);
  line-height:1.8;
  color:var(--silver-dim);
}
.prose{
  font-size:clamp(15px,1.1vw,17px);
  line-height:1.85;
  color:var(--silver-dim);
  max-width:72ch;
}
.prose p+p{margin-top:1em}
.prose h2,.prose h3{margin-top:1.8em;margin-bottom:.6em;color:var(--silver)}
.prose ul,.prose ol{margin:1em 0;display:grid;gap:.55em;padding-left:1.1em;list-style:disc}
.prose ol{list-style:decimal}
.prose strong{color:var(--silver);font-weight:600}
.prose a{color:var(--nebula);border-bottom:1px solid rgba(168,139,250,.45)}
.note{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--silver-dim);
  opacity:.8;
  line-height:1.8;
}
.band--paper{background:var(--paper);color:var(--ink)}
.band--paper h2,.band--paper h3{color:var(--ink)}
.band--paper .prose{color:#2B3242}
.band--paper .prose strong{color:var(--ink)}
.band--paper .prose a{color:#5B41B8;border-bottom-color:rgba(91,65,184,.4)}
.band--paper .eyebrow{color:#6B51C9}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55em;
  padding:.66em 1.15em;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:.9rem;
  font-weight:600;
  line-height:1.2;
  cursor:pointer;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn--primary{
  background:var(--orange);
  border-color:var(--orange);
  color:var(--orange-ink);
}
.btn--primary:hover{background:var(--orange-hi);border-color:var(--orange-hi)}
.btn--ghost{
  background:transparent;
  border-color:var(--line-2);
  color:var(--silver);
}
.btn--ghost:hover{border-color:var(--nebula);color:var(--nebula)}
.btn--legacy{
  background:transparent;
  border-color:rgba(126,154,166,.5);
  color:var(--legacy);
}
.btn--legacy:hover{background:rgba(126,154,166,.12);border-color:var(--legacy);color:#9DB6C1}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.45em;
  padding:3px 8px;
  border:1px solid var(--line-2);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.6;
  color:var(--silver-dim);
  white-space:nowrap;
}
.tag--nebula{color:var(--nebula);border-color:rgba(168,139,250,.45)}
.tag--legacy{color:var(--legacy);border-color:rgba(126,154,166,.5)}
.tag--moss{color:var(--moss);border-color:rgba(127,147,107,.55)}
.tag--clay{color:var(--clay);border-color:rgba(185,121,95,.55)}

/* ---------- 卡片与数据块 ---------- */
.card{
  padding:clamp(18px,2.4vw,32px);
  border:1px solid var(--line);
  border-radius:2px;
  background:transparent;
  transition:border-color .16s var(--ease),background-color .16s var(--ease);
}
.card--panel{background:var(--panel)}
.card:hover{border-color:var(--line-2)}
.card__title{
  font-family:var(--font-head);
  font-size:1.12rem;
  font-weight:700;
  letter-spacing:-.02em;
  color:var(--silver);
  margin-bottom:.5em;
}
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-head);
  font-size:clamp(1.6rem,3vw,2.6rem);
  font-weight:900;
  line-height:1;
  letter-spacing:-.04em;
  color:var(--silver);
}
.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--silver-dim);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.55em;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--silver-dim);
  padding-block:18px 0;
}
.breadcrumb a{color:var(--silver-dim);transition:color .16s var(--ease)}
.breadcrumb a:hover{color:var(--nebula)}
.breadcrumb__sep{opacity:.45}
.breadcrumb [aria-current]{color:var(--nebula)}

/* ---------- 图片容器（页面阶段放入 <img>） ---------- */
.figure{
  position:relative;
  border:1px solid var(--line);
  border-radius:2px;
  background:var(--panel);
  overflow:hidden;
}
.figure__media{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  background:
    radial-gradient(circle at 78% 20%, rgba(168,139,250,.24), transparent 58%),
    radial-gradient(circle at 16% 82%, rgba(126,154,166,.18), transparent 62%),
    linear-gradient(140deg,#0B1220 0%,#111A2B 54%,#05070F 100%);
}
.figure__media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(232,236,245,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,236,245,.06) 1px, transparent 1px);
  background-size:48px 48px;
}
.figure__media img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure--wide .figure__media{aspect-ratio:21/9}
.figure__caption{
  padding:10px 14px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--silver-dim);
}

/* ---------- 页头 ---------- */
.skip-link{
  position:fixed;
  top:-120px;
  left:16px;
  z-index:1000;
  padding:.7em 1.1em;
  background:var(--orange);
  color:var(--orange-ink);
  border-radius:2px;
  font-size:.9rem;
  font-weight:700;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(5,7,15,.94);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(ellipse 60% 120% at 50% 0%, rgba(168,139,250,.12), transparent 70%);
}
.header-grid{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,34px);
  min-height:var(--header-h);
}

.brand{
  display:flex;
  flex-direction:column;
  gap:3px;
  flex:0 0 auto;
  padding-block:6px;
}
.brand__mark{
  font-family:var(--font-head);
  font-size:1.06rem;
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.2;
  color:var(--silver);
  transition:color .16s var(--ease);
}
.brand__meta{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--legacy);
  line-height:1.3;
}
.brand:hover .brand__mark{color:var(--nebula)}

.header-rail{
  flex:1 1 auto;
  display:flex;
  align-items:center;
  gap:14px;
  min-width:60px;
  overflow:hidden;
}
.header-rail__ticks{
  flex:1 1 auto;
  height:9px;
  background-image:repeating-linear-gradient(90deg,var(--line-2) 0 1px,transparent 1px 10px);
  opacity:.65;
  mask-image:linear-gradient(90deg,transparent,#000 22%,#000 78%,transparent);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 22%,#000 78%,transparent);
}
.header-rail__coord{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--silver-dim);
  opacity:.7;
  white-space:nowrap;
}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(16px,2.2vw,32px);
  flex:0 0 auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
}
.nav-item{
  position:relative;
  display:inline-flex;
  align-items:center;
}
.nav-link{
  position:relative;
  display:inline-block;
  padding:6px 0;
  font-size:.9rem;
  font-weight:500;
  color:var(--silver-dim);
  white-space:nowrap;
  transition:color .16s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:1px;
  background:var(--nebula);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .16s var(--ease),background-color .16s var(--ease);
}
.nav-link:hover{color:var(--nebula)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--silver)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.nav-drawer-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:20px;
  height:20px;
  margin-left:2px;
  padding:0;
  background:none;
  border:0;
  cursor:pointer;
  color:var(--silver-dim);
  transition:color .16s var(--ease);
}
.nav-drawer-btn:hover{color:var(--nebula)}
.nav-drawer-btn__caret{
  display:block;
  width:6px;
  height:6px;
  border-right:1px solid currentColor;
  border-bottom:1px solid currentColor;
  transform:translateY(-2px) rotate(45deg);
  transition:transform .16s var(--ease);
}
.nav-drawer-btn[aria-expanded="true"]{color:var(--nebula)}
.nav-drawer-btn[aria-expanded="true"] .nav-drawer-btn__caret{transform:translateY(1px) rotate(225deg)}

.nav-cta{flex:0 0 auto;white-space:nowrap}
.nav-extras{display:none}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 12px;
  background:transparent;
  border:1px solid var(--line-2);
  border-radius:2px;
  color:var(--silver);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--nebula);color:var(--nebula)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:14px}
.nav-toggle__bars span{
  display:block;
  height:1px;
  width:100%;
  background:currentColor;
  transition:transform .16s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(2.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.5px) rotate(-45deg)}

/* ---------- 二级抽屉 ---------- */
.drawer{
  display:none;
  position:relative;
  background:var(--deep);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.drawer[data-open]{display:block}
.drawer__inner{
  display:grid;
  grid-template-columns:180px minmax(0,1fr);
  gap:clamp(16px,3vw,44px);
  align-items:start;
  padding-block:22px 26px;
}
.drawer__title{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--nebula);
  line-height:1.8;
}
.drawer__list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:6px 20px;
}
.drawer__link{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  padding:8px 10px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:.9rem;
  color:var(--silver-dim);
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.drawer__link .mono{font-size:10px;letter-spacing:.08em;opacity:.55;white-space:nowrap}
.drawer__link:hover{
  color:var(--nebula);
  border-color:rgba(168,139,250,.4);
  background:rgba(168,139,250,.07);
}
.drawer__link.is-legacy{color:var(--legacy)}
.drawer__link.is-legacy:hover{
  color:#9DB6C1;
  border-color:rgba(126,154,166,.55);
  background:rgba(126,154,166,.1);
}

/* ---------- 滚动进度光标 ---------- */
.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:var(--progress,0%);
  background:linear-gradient(90deg,var(--nebula),var(--orange));
  pointer-events:none;
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(56px,8vw,120px);
  background:var(--deep);
  border-top:1px solid var(--line-2);
  color:var(--silver-dim);
  position:relative;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(168,139,250,.55),transparent);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.1fr 1.45fr 1.3fr;
  gap:clamp(28px,4vw,64px);
  padding-block:clamp(38px,6vw,72px);
}
.footer-brand__mark{
  font-family:var(--font-head);
  font-size:clamp(1.5rem,2.4vw,2.1rem);
  font-weight:900;
  letter-spacing:-.04em;
  line-height:1.1;
  color:var(--silver);
  margin-bottom:12px;
}
.footer-brand__line{
  font-size:.92rem;
  line-height:1.8;
  color:var(--silver-dim);
  max-width:34ch;
}
.footer-brand__coord{
  margin-top:16px;
  font-size:10px;
  letter-spacing:.14em;
  color:var(--legacy);
}
.footer-head{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--nebula);
  margin-bottom:14px;
  line-height:1.6;
}
.footer-contact__list{display:grid;gap:10px}
.footer-contact__list li{
  display:grid;
  grid-template-columns:62px minmax(0,1fr);
  gap:12px;
  align-items:baseline;
  font-size:.92rem;
  line-height:1.7;
  color:var(--silver-dim);
}
.footer-key{
  font-size:10px;
  letter-spacing:.14em;
  color:var(--legacy);
}
.footer-note{
  margin-top:16px;
  padding-top:14px;
  border-top:1px solid var(--line);
  font-size:.84rem;
  line-height:1.75;
  color:var(--silver-dim);
  opacity:.9;
  max-width:44ch;
}
.footer-nav{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:clamp(20px,3vw,40px);
}
.footer-col ul{display:grid;gap:9px}
.footer-col a{
  position:relative;
  display:inline-block;
  font-size:.92rem;
  line-height:1.7;
  color:var(--silver-dim);
  transition:color .16s var(--ease);
}
.footer-col a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .16s var(--ease);
}
.footer-col a:hover{color:var(--nebula)}
.footer-col a:hover::after{transform:scaleX(1)}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  padding-block:18px;
  border-top:1px solid var(--line);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--silver-dim);
  opacity:.8;
}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  :root{--header-h:66px}
  .header-rail{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:10px var(--gutter) 26px;
    background:var(--deep);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    box-shadow:0 30px 60px rgba(0,0,0,.62);
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{
    width:100%;
    justify-content:space-between;
    border-bottom:1px solid var(--line);
  }
  .nav-link{display:block;width:100%;padding:15px 0;font-size:1rem}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--orange)}
  .nav-drawer-btn{width:34px;height:34px;margin-left:0}
  .site-nav .nav-cta{margin-top:18px;width:100%}
  .nav-extras{
    display:block;
    margin-top:24px;
    padding-top:18px;
    border-top:1px dashed var(--line-2);
  }
  .nav-extras__title{
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.18em;
    color:var(--legacy);
    margin-bottom:10px;
    line-height:1.6;
  }
  .nav-extras ul{display:grid;gap:0}
  .nav-extras a{
    display:block;
    padding:12px 0;
    font-size:.92rem;
    color:var(--silver-dim);
    border-bottom:1px solid var(--line);
    transition:color .16s var(--ease);
  }
  .nav-extras a:hover{color:var(--nebula)}
  .nav-extras a.is-legacy{color:var(--legacy)}
  .nav-extras a.is-legacy:hover{color:#9DB6C1}
  .drawer{display:none !important}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-nav{grid-column:1 / -1}
}

/* ---------- 手机 ---------- */
@media (max-width:760px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-4{grid-column:span 3}
  .col-6{grid-column:span 6}
  .col-8{grid-column:span 6}
  .col-12{grid-column:span 6}
  .track{grid-template-columns:1fr;gap:10px}
  .track__label{font-size:10px}
  .section__head{flex-direction:column;align-items:flex-start;gap:10px}
}
@media (max-width:640px){
  :root{--header-h:62px}
  body{font-size:15px}
  .brand__meta{display:none}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-base{flex-direction:column;align-items:flex-start;gap:6px}
  .drawer__inner{grid-template-columns:1fr}
  .drawer__list{grid-template-columns:1fr}
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}