:root{
  --bg:#0b0f19;
  --panel:#111827;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --brand:#60a5fa;
  --border:rgba(255,255,255,0.08);
  --shadow:0 10px 30px rgba(0,0,0,0.35);
  --radius:14px;
  --max:980px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,
    "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",
    "PingFang TC","Microsoft JhengHei","Noto Sans CJK TC",sans-serif;
  background:
    radial-gradient(1200px 700px at 20% 10%, rgba(96,165,250,0.18), transparent 60%),
    radial-gradient(900px 600px at 80% 0%, rgba(16,185,129,0.12), transparent 60%),
    var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

.container{max-width:var(--max);margin:0 auto;padding:28px 18px 60px}

.topbar{
  display:flex;
  gap:14px;
  align-items:center;
  justify-content:space-between;
  border:1px solid var(--border);
  background:rgba(17,24,39,0.7);
  backdrop-filter:blur(10px);
  box-shadow:var(--shadow);
  padding:14px 16px;
  border-radius:var(--radius);
}

.brand{display:flex;flex-direction:column;gap:2px;min-width:160px}
.brand .title{font-weight:800;letter-spacing:0.2px}
.brand .subtitle{color:var(--muted);font-size:13px}

.nav{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.nav a{
  padding:8px 10px;
  border-radius:10px;
  border:1px solid transparent;
  color:var(--text);
}
.nav a.active{
  border-color:var(--border);
  background:rgba(255,255,255,0.04);
}

.lang{display:flex;gap:8px}
.langBtn{
  border:1px solid var(--border);
  background:rgba(255,255,255,0.04);
  color:var(--text);
  padding:8px 10px;
  border-radius:10px;
  cursor:pointer;
}
.langBtn.active{
  border-color:rgba(96,165,250,0.55);
  background:rgba(96,165,250,0.12);
}

.panel{
  margin-top:16px;
  border:1px solid var(--border);
  background:rgba(17,24,39,0.75);
  box-shadow:var(--shadow);
  border-radius:var(--radius);
  padding:22px 18px 14px;
}

.breadcrumbs{color:var(--muted);font-size:13px;margin-bottom:6px}
h1{margin:6px 0 8px;font-size:28px;letter-spacing:0.2px}
.lead{margin:0 0 18px;color:var(--muted)}
h2{margin:18px 0 8px;font-size:18px}
p{margin:8px 0}
ul{margin:8px 0 8px 18px}
li{margin:6px 0}
code{
  background:rgba(255,255,255,0.06);
  padding:2px 6px;
  border-radius:8px;
  border:1px solid var(--border);
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
  font-size:0.95em;
}
.hr{height:1px;background:var(--border);margin:18px 0}

.notice{
  border:1px solid var(--border);
  background:rgba(255,255,255,0.04);
  padding:12px 12px;
  border-radius:12px;
}

.footer{
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid var(--border);
  display:flex;
  flex-direction:column;
  gap:6px;
}
.muted{color:var(--muted);font-size:13px}

@media (max-width: 860px){
  .topbar{flex-direction:column;align-items:flex-start}
  .nav{justify-content:flex-start}
}