:root{
  --void:#05080f;--navy:#090e1c;--navy-2:#0b1222;--surface-2:#121d39;
  --line:#1b2845;--line-soft:rgba(255,255,255,.06);
  --ink:#e9eefb;--ink-dim:#aab4ce;--muted:#727f9d;--muted-2:#566180;
  --mint:#2fe6a6;--mint-dim:#1fae7e;--cyan:#3bc9f0;--rose:#ff4d6d;--amber:#f5c542;
  --glow-mint:rgba(47,230,166,.18);
  --mono:'JetBrains Mono',ui-monospace,monospace;--sans:'Inter',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--void);color:var(--ink);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(900px 500px at 80% -10%,rgba(59,201,240,.10),transparent 60%),radial-gradient(800px 600px at 5% 5%,var(--glow-mint),transparent 55%)}
::selection{background:var(--mint);color:#04110c}
a{color:inherit;text-decoration:none}
.wrap{width:min(820px,92vw);margin-inline:auto;position:relative;z-index:1}

/* nav */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:linear-gradient(180deg,rgba(5,8,15,.86),rgba(5,8,15,.55));border-bottom:1px solid var(--line-soft)}
.nav-in{width:min(1100px,92vw);margin-inline:auto;display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:.04em;font-size:18px}
.brand .mark{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(135deg,var(--mint),var(--cyan));color:#04110c;font-family:var(--mono);font-weight:700;font-size:15px;box-shadow:0 0 18px var(--glow-mint)}
.brand small{font-family:var(--mono);font-size:9px;letter-spacing:.28em;color:var(--muted);font-weight:500;display:block;margin-top:-3px}
.nav-right{display:flex;align-items:center;gap:14px}
.back{font-family:var(--mono);font-size:12px;color:var(--muted);transition:.15s}
.back:hover{color:var(--mint)}
.langtog{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;font-family:var(--mono);font-size:11px;font-weight:600}
.langtog button{background:transparent;color:var(--muted);border:0;padding:6px 11px;cursor:pointer;transition:.15s}
.langtog button.on{background:var(--surface-2);color:var(--mint)}

/* doc head */
.doc{padding:64px 0 40px}
.eyebrow{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--mint);display:inline-flex;align-items:center;gap:9px}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--mint);opacity:.7}
h1{font-size:clamp(30px,5vw,46px);font-weight:900;letter-spacing:-.03em;line-height:1.05;margin:16px 0 0}
.updated{font-family:var(--mono);font-size:12px;color:var(--muted);margin-top:16px}

/* warning banner */
.callout{margin-top:28px;border:1px solid rgba(245,197,66,.32);background:linear-gradient(180deg,rgba(245,197,66,.07),transparent);border-radius:14px;padding:18px 20px}
.callout .h{font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--amber)}
.callout p{color:var(--ink-dim);font-size:14px;margin-top:8px}
.callout.rose{border-color:rgba(255,77,109,.32);background:linear-gradient(180deg,rgba(255,77,109,.06),transparent)}
.callout.rose .h{color:var(--rose)}

/* body */
.body{padding:8px 0 90px}
section.s{padding:30px 0;border-top:1px solid var(--line-soft)}
section.s:first-child{border-top:0}
.s-no{font-family:var(--mono);font-size:12px;color:var(--mint);letter-spacing:.1em}
h2{font-size:22px;font-weight:800;letter-spacing:-.01em;margin:8px 0 0}
h3{font-size:15px;font-weight:700;color:var(--ink);margin:22px 0 0}
p{color:var(--ink-dim);font-size:15px;margin-top:14px}
p.lead{font-size:16px}
ul{margin:14px 0 0;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:10px}
li{color:var(--ink-dim);font-size:14.5px;display:flex;gap:11px;align-items:flex-start;line-height:1.55}
li::before{content:"+";font-family:var(--mono);color:var(--mint);font-weight:700;flex-shrink:0;margin-top:1px}
li.x::before{content:"×";color:var(--rose)}
strong{color:var(--ink);font-weight:700}
.kw{font-family:var(--mono);font-size:.92em;color:var(--cyan)}
.tbl{margin-top:16px;border:1px solid var(--line-soft);border-radius:12px;overflow:hidden}
.tbl .r{display:grid;grid-template-columns:1fr 1.4fr;gap:0;border-top:1px solid var(--line-soft)}
.tbl .r:first-child{border-top:0}
.tbl .c{padding:12px 14px;font-size:13.5px;color:var(--ink-dim)}
.tbl .c.k{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--ink);background:rgba(255,255,255,.012);text-transform:uppercase}

/* toc */
.toc{margin-top:30px;border:1px solid var(--line-soft);border-radius:14px;padding:18px 20px;background:rgba(255,255,255,.012)}
.toc .t{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.toc ol{margin:12px 0 0;padding-left:20px;display:grid;grid-template-columns:1fr 1fr;gap:7px}
.toc li{display:list-item}
.toc li::before{content:none}
.toc a{font-size:13.5px;color:var(--ink-dim);transition:.15s}
.toc a:hover{color:var(--mint)}

/* footer */
footer{border-top:1px solid var(--line-soft);padding:40px 0}
.foot-in{width:min(1100px,92vw);margin-inline:auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:18px}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{font-size:13px;color:var(--muted);transition:.15s}
.foot-links a:hover{color:var(--mint)}
.foot-links a.cur{color:var(--mint)}
.foot-copy{font-family:var(--mono);font-size:11px;color:var(--muted-2)}
@media(max-width:600px){
  .toc ol{grid-template-columns:1fr}
  .tbl .r{grid-template-columns:1fr}
  .nav-in .back{display:none}
}