:root{
  --bg:#080B16;
  --bg-soft:#0E1425;
  --card:#121A2E;
  --card-hi:#16203A;
  --line:#222E4C;
  --txt:#E8EDF9;
  --muted:#93A0BF;
  --blue:#4D6BFE;
  --blue-soft:#7C93FF;
  --cyan:#39D2C0;
  --amber:#FFB86B;
  --radius:14px;
  --maxw:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--blue-soft);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(8,11,22,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav-in{
  max-width:var(--maxw);margin:0 auto;padding:14px 22px;
  display:flex;align-items:center;gap:26px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:.2px}
.brand:hover{text-decoration:none}
.dot{
  width:26px;height:26px;border-radius:8px;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  display:grid;place-items:center;font-size:14px;color:#fff;font-weight:800;
}
.nav-links{display:flex;gap:22px;margin-left:auto;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-size:14.5px;font-weight:500}
.nav-links a:hover{color:var(--txt);text-decoration:none}
.nav-links a.on{color:var(--blue-soft)}

/* ---------- layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
section{padding:64px 0}
h1,h2,h3{line-height:1.3;margin:0 0 14px}
h1{font-size:clamp(30px,5vw,50px);letter-spacing:-.5px}
h2{font-size:clamp(23px,3.2vw,32px);letter-spacing:-.2px}
h3{font-size:18px}
p{margin:0 0 14px;color:var(--muted)}
.lead{font-size:17.5px;color:#B9C4DC;max-width:760px}

/* ---------- hero ---------- */
.hero{
  padding:78px 0 58px;
  background:
    radial-gradient(900px 420px at 12% -10%,rgba(77,107,254,.26),transparent 62%),
    radial-gradient(700px 380px at 96% 4%,rgba(57,210,192,.14),transparent 60%);
  border-bottom:1px solid var(--line);
}
.tag{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--line);background:rgba(77,107,254,.10);
  color:var(--blue-soft);border-radius:999px;
  padding:5px 13px;font-size:13px;font-weight:600;margin-bottom:20px;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{
  display:inline-block;padding:11px 22px;border-radius:10px;
  font-weight:600;font-size:14.5px;border:1px solid transparent;
}
.btn-p{background:var(--blue);color:#fff}
.btn-p:hover{background:#3F5BF0;text-decoration:none}
.btn-s{border-color:var(--line);color:var(--txt);background:rgba(255,255,255,.02)}
.btn-s:hover{border-color:var(--blue);text-decoration:none}

/* ---------- grid + cards ---------- */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(196px,1fr))}
.card{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:22px;
}
.card:hover{background:var(--card-hi)}
.card h3{color:var(--txt)}
.card p{margin-bottom:0;font-size:14.5px}
.stat{text-align:center;padding:20px 14px}
.stat .n{
  font-size:29px;font-weight:800;letter-spacing:-.5px;
  background:linear-gradient(135deg,var(--blue-soft),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat .l{color:var(--muted);font-size:13.5px;margin-top:4px}

/* ---------- tables ---------- */
.tw{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);margin:18px 0}
table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:560px}
th,td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--bg-soft);color:var(--txt);font-weight:600;font-size:13.5px;white-space:nowrap}
td{color:var(--muted)}
tr:last-child td{border-bottom:none}
tbody tr:hover td{background:rgba(77,107,254,.05)}
td strong{color:var(--txt);font-weight:600}
.ok{color:var(--cyan);font-weight:600}
.no{color:#6C7793}

/* ---------- code ---------- */
pre{
  background:#070A12;border:1px solid var(--line);border-radius:12px;
  padding:16px 18px;overflow-x:auto;font-size:13.5px;line-height:1.7;
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  color:#C7D2EA;margin:14px 0;
}
code{
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  background:rgba(77,107,254,.13);color:#AFC0FF;
  padding:2px 6px;border-radius:5px;font-size:13.5px;
}
pre code{background:none;padding:0;color:inherit}
.k{color:#7C93FF}.s{color:#39D2C0}.c{color:#5A6784}.n{color:#FFB86B}

/* ---------- misc ---------- */
.note{
  border-left:3px solid var(--blue);background:rgba(77,107,254,.08);
  border-radius:0 10px 10px 0;padding:14px 18px;margin:18px 0;
  font-size:14.5px;color:#B9C4DC;
}
.note.warn{border-left-color:var(--amber);background:rgba(255,184,107,.08)}
ul.clean{color:var(--muted);padding-left:20px;margin:12px 0}
ul.clean li{margin-bottom:8px}
ul.clean strong{color:var(--txt)}
.faq{border:1px solid var(--line);border-radius:12px;margin-bottom:12px;background:var(--card)}
.faq summary{
  padding:16px 20px;cursor:pointer;font-weight:600;font-size:15.5px;color:var(--txt);
  list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue-soft);font-size:20px;font-weight:400}
.faq[open] summary::after{content:"–"}
.faq .body{padding:0 20px 18px;color:var(--muted);font-size:14.5px}
.faq .body p:last-child{margin-bottom:0}
footer{
  border-top:1px solid var(--line);padding:34px 0;
  color:var(--muted);font-size:13.5px;background:var(--bg-soft);
}
footer .wrap{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.foot-src{max-width:640px}
.page-head{
  padding:52px 0 30px;border-bottom:1px solid var(--line);
  background:radial-gradient(700px 300px at 8% -30%,rgba(77,107,254,.20),transparent 62%);
}
.crumb{color:var(--muted);font-size:13.5px;margin-bottom:10px}