:root{
  --bg:#000000;
  --panel:#121212;
  --panel-2:#0a0c11;
  --line:#1e222c;
  --ink:#e6e8ee;
  --dim:#98a0b3;
  --blue:#4f7cff;
  --gold:#e8c37a;
  --green:#6ee7a8;
  --violet:#a98bff;
  --r:4px;
  --rail:78px;
  --serif:"Newsreader",Georgia,"Songti SC","Noto Serif SC",serif;
  --sans:"Roboto",-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  color-scheme:dark;
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  padding-left:var(--rail);
  background:var(--bg);
  color:var(--ink);
  font:17px/1.72 var(--sans);
  font-weight:400;
  letter-spacing:.005em;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:#a9c2ff}
a:hover{color:#fff}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:2px}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;letter-spacing:.01em;color:#fff}
p{margin:0 0 1em}

/* ---------- 左侧竖排轨道导航 ---------- */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:16px;
  padding:18px 0 22px;
  background:linear-gradient(180deg,#060709 0%,#000 62%);
  border-right:1px solid var(--line);
  z-index:60;
}
.mark{
  display:grid;
  place-items:center;
  width:44px;
  height:44px;
  border:1px solid #26304a;
  border-radius:var(--r);
  background:#07090e;
  text-decoration:none;
  filter:brightness(.95);
}
.mark:hover{border-color:var(--blue);box-shadow:0 0 12px rgba(79,124,255,.45)}
.mark-glyph{display:grid;grid-template-columns:1fr 1fr;gap:3px;width:16px;height:16px}
.mark-glyph i{display:block;border-radius:1px;background:var(--blue);box-shadow:0 0 10px rgba(79,124,255,.6)}
.mark-glyph i:nth-child(2){background:var(--gold);box-shadow:0 0 10px rgba(232,195,122,.55)}
.mark-glyph i:nth-child(3){background:var(--violet);box-shadow:0 0 10px rgba(169,139,255,.55)}
.mark-glyph i:nth-child(4){background:var(--green);box-shadow:0 0 10px rgba(110,231,168,.55)}

.nav-details{position:relative}
.menu-btn{
  list-style:none;
  width:58px;
  min-height:46px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:7px;
  padding:9px 4px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:#0a0c11;
  color:var(--dim);
  font-size:16px;
  cursor:pointer;
  user-select:none;
}
.menu-btn::-webkit-details-marker{display:none}
.menu-btn:hover{color:#fff;border-color:#33405e}
.bars{
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  box-shadow:0 5px 0 currentColor,0 -5px 0 currentColor;
}
.nav-details[open] .menu-btn{color:#fff;border-color:var(--blue);box-shadow:0 0 12px rgba(79,124,255,.4)}
.nav-menu{
  position:absolute;
  left:calc(100% + 12px);
  top:0;
  width:238px;
  margin:0;
  padding:8px;
  list-style:none;
  background:#0b0d13;
  border:1px solid #232a38;
  border-radius:var(--r);
  box-shadow:0 22px 48px rgba(0,0,0,.85);
}
.nav-menu li a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:8px 10px;
  color:#ccd4e5;
  text-decoration:none;
  border-radius:var(--r);
  font-size:16px;
}
.nav-menu li a::before{
  content:"";
  flex:none;
  width:6px;
  height:6px;
  border-radius:2px;
  background:var(--blue);
  box-shadow:0 0 10px rgba(79,124,255,.8);
}
.nav-menu li a:hover{background:#161b25;color:#fff}

.cta{
  margin-top:auto;
  writing-mode:vertical-rl;
  text-orientation:mixed;
  letter-spacing:.24em;
  padding:16px 9px;
  border:1px solid rgba(79,124,255,.55);
  border-radius:var(--r);
  background:rgba(79,124,255,.13);
  color:#dbe6ff;
  text-decoration:none;
  font-size:16px;
  box-shadow:0 0 14px rgba(79,124,255,.2);
}
.cta:hover{background:rgba(79,124,255,.26);color:#fff;box-shadow:0 0 20px rgba(79,124,255,.5)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:45vh;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  isolation:isolate;
  background:#04060a;
  border-radius:0 0 50% 50% / 0 0 58px 58px;
}
.hero-media{position:absolute;inset:0;z-index:-2}
.hero-media img{width:100%;height:100%;object-fit:cover;filter:brightness(.72) saturate(.85)}
.hero-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(120% 90% at 8% 100%,rgba(0,0,0,.95) 0%,rgba(0,0,0,.55) 45%,rgba(0,0,0,.2) 100%),
    linear-gradient(180deg,rgba(0,0,0,.55),rgba(0,0,0,.15) 40%,rgba(0,0,0,.9));
}
.hero-in{
  position:relative;
  max-width:720px;
  padding:56px 44px 62px;
}
.badge{
  display:inline-block;
  margin:0 0 14px;
  padding:5px 15px;
  font-size:16px;
  letter-spacing:.16em;
  color:#cfe0ff;
  border:1px solid rgba(79,124,255,.45);
  border-radius:999px;
  background:rgba(79,124,255,.1);
  text-shadow:0 0 10px rgba(79,124,255,.55);
  box-shadow:0 0 18px rgba(79,124,255,.18);
  transition:opacity .22s ease;
}
.hero h1{
  margin:0 0 14px;
  font-size:clamp(2rem,5.2vw,3.5rem);
  line-height:1.14;
  text-shadow:0 0 22px rgba(120,160,255,.28);
}
.lede{
  max-width:52ch;
  color:#c7cedd;
  margin:0 0 26px;
}
.jump{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:10px 22px;
  border-radius:var(--r);
  border:1px solid rgba(232,195,122,.5);
  background:rgba(232,195,122,.1);
  color:#f0dcb4;
  text-decoration:none;
  letter-spacing:.08em;
  box-shadow:0 0 16px rgba(232,195,122,.16);
}
.jump:hover{background:rgba(232,195,122,.22);color:#fff}

/* ---------- 主体网格 ---------- */
.wrap{
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  gap:46px;
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:38px 44px 68px;
}
.toc{
  position:sticky;
  top:26px;
  align-self:start;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:18px 16px 14px;
  border-bottom:2px solid rgba(79,124,255,.65);
}
.toc small{
  display:block;
  font-size:16px;
  letter-spacing:.2em;
  color:#7c8bab;
  margin-bottom:4px;
}
.toc h2{
  font-size:1.2rem;
  margin:0 0 12px;
  line-height:1.3;
}
.toc ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.toc a{
  display:flex;
  align-items:baseline;
  gap:9px;
  min-height:42px;
  padding:8px 8px;
  color:var(--dim);
  text-decoration:none;
  border-radius:var(--r);
  border-bottom:1px solid #191d25;
  font-size:16px;
  line-height:1.4;
}
.toc a:last-child{border-bottom:0}
.toc em{font-style:normal;color:#54627f;font-variant-numeric:tabular-nums;font-size:15px;flex:none}
.toc a:hover{color:#fff;background:#171c26}
.toc a:hover em{color:var(--blue)}

.main{min-width:0}
.doc > section{
  padding:40px 0 26px;
  border-bottom:1px solid var(--line);
  scroll-margin-top:86px;
}
.doc > section:first-child{padding-top:4px}
.doc > section:last-child{border-bottom:0}
.doc > section:hover{border-bottom-color:#2b3550}

.doc small{
  display:block;
  font-size:16px;
  letter-spacing:.18em;
  color:#7f90b3;
  margin-bottom:2px;
}
.doc h2{
  font-size:clamp(1.5rem,3vw,2rem);
  line-height:1.25;
  margin:.1em 0 .65em;
  text-shadow:0 0 16px rgba(110,150,255,.2);
}
.doc h3{font-size:1.28rem;line-height:1.35;margin:1.5em 0 .5em}
.doc h4{font-size:1.08rem;margin:1.3em 0 .4em}
.doc p{max-width:66ch;color:#d2d8e5;margin:0 0 1em}
.doc ul,.doc ol{max-width:64ch;padding-left:1.25em;margin:0 0 1em}
.doc li{margin:.3em 0}
.doc a{color:#a9c2ff;text-decoration-thickness:1px;text-underline-offset:3px}
.doc strong,.doc b{color:#fff}
.doc blockquote{
  margin:1.3em 0;
  padding:.2em 0 .2em 16px;
  border-left:2px solid var(--blue);
  color:#b9c3d7;
  max-width:64ch;
}
.doc hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.doc figure{margin:1.4em 0}
.doc figcaption{font-size:16px;color:#8b94a8;margin-top:.5em}
.doc img{border-radius:var(--r);border:1px solid #1b2029}
.doc table{width:100%;border-collapse:collapse;display:block;overflow-x:auto;margin:1.4em 0;font-size:16px}
.doc th,.doc td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left}
.doc th{color:#fff;font-weight:500;background:#0e1117}
.doc code{font-size:.95em;background:#12151c;border:1px solid #1e2531;border-radius:3px;padding:1px 5px}
.doc pre{overflow-x:auto;background:#0c0f15;border:1px solid #1c2330;border-radius:var(--r);padding:14px}
.doc pre code{border:0;background:none;padding:0}

/* ---------- 页脚 ---------- */
.foot{
  max-width:1180px;
  margin:0 auto;
  padding:34px 44px 60px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,#000,#040508);
}
.foot-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px}
address{
  font-style:normal;
  display:flex;
  flex-direction:column;
  gap:6px;
  padding-bottom:14px;
  border-bottom:2px solid rgba(232,195,122,.5);
}
address strong{font-family:var(--serif);font-size:1.15rem;color:#fff;letter-spacing:.02em}
address .host{color:#7c8698;font-size:16px;word-break:break-all}
.foot-nav{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 18px;
  align-content:start;
}
.foot-nav a{
  display:flex;
  align-items:center;
  min-height:42px;
  color:var(--dim);
  text-decoration:none;
  font-size:16px;
  border-bottom:1px solid #14171e;
}
.foot-nav a:hover{color:#fff}
.copy{margin:28px 0 0;font-size:16px;color:#6e778a}

/* ---------- 动效 ---------- */
.rv{opacity:0;transform:translateY(12px);transition:opacity .55s ease,transform .55s ease}
.rv.in{opacity:1;transform:none}

/* ---------- 移动端 ---------- */
@media (max-width:900px){
  body{padding-left:0;padding-top:66px}
  .rail{
    inset:0 0 auto 0;
    width:auto;
    height:66px;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:0 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:#050608;
  }
  .mark{order:1;width:42px;height:42px}
  .cta{
    order:2;
    margin:0 0 0 auto;
    writing-mode:horizontal-tb;
    letter-spacing:.06em;
    padding:10px 15px;
    min-height:44px;
    display:inline-flex;
    align-items:center;
  }
  .nav-details{order:3;position:static}
  .menu-btn{flex-direction:row;width:auto;padding:11px 13px;gap:8px;min-height:44px}
  .nav-menu{left:auto;right:10px;top:calc(100% + 10px);width:min(268px,calc(100vw - 24px))}
  .hero{min-height:44vh;border-radius:0 0 26px 26px}
  .hero-in{padding:30px 18px 40px}
  .hero h1{font-size:clamp(1.85rem,8vw,2.5rem)}
  .wrap{grid-template-columns:1fr;gap:26px;padding:26px 18px 52px}
  .toc{position:static}
  .doc > section{scroll-margin-top:76px}
  .foot{padding:26px 18px 64px}
  .foot-grid{grid-template-columns:1fr;gap:24px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .badge{transition:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}