:root{
  --bg:#0b1020; --bg2:#0f1730; --card:#121b34; --line:#22304f;
  --text:#e8edf7; --muted:#9aa7c2; --brand:#3b82f6; --brand2:#22d3ee;
  --ok:#34d399; --warn:#fbbf24; --radius:16px; --maxw:1140px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;
  background:radial-gradient(1200px 600px at 80% -10%,#16224a 0%,var(--bg) 55%) no-repeat,var(--bg);
  color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.en{display:none}
html[lang="en"] .zh{display:none}
html[lang="en"] .en{display:inline}

/* nav */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(11,16,32,.72);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:18px;height:64px}
.brand{font-weight:800;font-size:18px;letter-spacing:.3px;display:flex;align-items:center;gap:10px}
.brand .dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 0 18px var(--brand)}
.nav .links{display:flex;gap:20px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav .links a:hover{color:var(--text)}
.lang{cursor:pointer;border:1px solid var(--line);background:transparent;color:var(--text);
  padding:7px 12px;border-radius:10px;font-size:13px}
.lang:hover{border-color:var(--brand)}
.btn{display:inline-block;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  padding:11px 22px;border-radius:12px;font-weight:700;font-size:14px;border:none;cursor:pointer}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text);font-weight:600}

/* hero */
.hero{padding:84px 0 64px;text-align:center}
.hero .tag{display:inline-block;font-size:13px;color:var(--brand2);border:1px solid var(--line);
  padding:6px 14px;border-radius:999px;margin-bottom:22px;background:rgba(34,211,238,.08)}
.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.15;font-weight:850;letter-spacing:-.5px}
.hero h1 .grad{background:linear-gradient(120deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{color:var(--muted);font-size:17px;max-width:680px;margin:18px auto 0}
.hero .cta{margin-top:32px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero .price-pill{margin-top:22px;font-size:14px;color:var(--muted)}
.hero .price-pill b{color:var(--text);font-size:20px}

/* sections */
section{padding:64px 0}
.sec-head{text-align:center;max-width:720px;margin:0 auto 40px}
.sec-head h2{font-size:clamp(24px,3.4vw,36px);font-weight:820;letter-spacing:-.4px}
.sec-head p{color:var(--muted);margin-top:12px;font-size:15px}

/* feature grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:linear-gradient(180deg,var(--card),rgba(18,27,52,.6));border:1px solid var(--line);
  border-radius:var(--radius);padding:22px;transition:.2s}
.card:hover{border-color:var(--brand);transform:translateY(-3px)}
.card .ico{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:rgba(59,130,246,.14);font-size:22px;margin-bottom:14px}
.card h3{font-size:16px;margin-bottom:8px}
.card p{font-size:13.5px;color:var(--muted)}

/* security highlight */
.sec2{background:linear-gradient(180deg,rgba(15,23,48,.4),transparent)}
.secbar{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:10px}
.scard{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--card);position:relative;overflow:hidden}
.scard:before{content:"";position:absolute;inset:0;background:radial-gradient(400px 200px at 100% 0,#3b82f61a,transparent)}
.scard .k{font-size:13px;color:var(--brand2);font-weight:700;letter-spacing:.4px}
.scard h3{font-size:19px;margin:8px 0 10px}
.scard p{font-size:14px;color:var(--muted)}

/* pricing */
.price{display:grid;grid-template-columns:1.1fr .9fr;gap:26px;align-items:stretch}
.ptable{background:linear-gradient(180deg,#15224a,#101a36);border:1px solid var(--brand);
  border-radius:22px;padding:34px;position:relative;box-shadow:0 20px 60px #0008}
.ptable .ribbon{position:absolute;top:18px;right:-34px;transform:rotate(38deg);background:var(--brand2);color:#04222a;
  font-size:12px;font-weight:800;padding:6px 44px}
.ptable .amt{font-size:52px;font-weight:850;letter-spacing:-1px}
.ptable .amt small{font-size:18px;color:var(--muted);font-weight:600}
.ptable ul{list-style:none;margin:20px 0 26px;font-size:14.5px}
.ptable li{padding:9px 0;border-bottom:1px solid var(--line);display:flex;gap:10px;align-items:flex-start}
.ptable li .ck{color:var(--ok);font-weight:800}
.pnote{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:28px;font-size:14px;color:var(--muted)}
.pnote h4{color:var(--text);font-size:16px;margin-bottom:10px}
.pnote code{background:#0a1124;border:1px solid var(--line);padding:2px 8px;border-radius:6px;color:var(--brand2);font-size:13px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.step{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--card);position:relative}
.step .n{counter-increment:s;font-size:13px;color:var(--brand2);font-weight:800}
.step .n:before{content:"0" counter(s);display:block;font-size:30px;color:var(--text);font-weight:850;margin-bottom:8px}
.step h3{font-size:16px;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--muted)}

/* distribution */
.dist{background:linear-gradient(180deg,transparent,rgba(15,23,48,.5));border-top:1px solid var(--line)}
.distgrid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.dcard{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--card)}
.dcard h3{font-size:16px;margin-bottom:8px}
.dcard p{font-size:13.5px;color:var(--muted);margin-bottom:12px}
.dcard .url{display:block;background:#0a1124;border:1px solid var(--line);border-radius:10px;
  padding:12px 14px;font-size:13px;color:var(--brand2);word-break:break-all;cursor:copy}

/* modal */
.mask{position:fixed;inset:0;background:#04060ccc;backdrop-filter:blur(4px);display:none;
  align-items:center;justify-content:center;z-index:100;padding:20px}
.mask.open{display:flex}
.modal{background:var(--bg2);border:1px solid var(--line);border-radius:18px;max-width:460px;width:100%;padding:28px}
.modal h3{font-size:20px;margin-bottom:8px}
.modal p{font-size:14px;color:var(--muted);margin-bottom:16px}
.modal label{display:block;font-size:13px;color:var(--muted);margin:12px 0 6px}
.modal input{width:100%;padding:11px 13px;border-radius:10px;border:1px solid var(--line);
  background:#0a1124;color:var(--text);font-size:14px}
.modal .row{display:flex;gap:10px;margin-top:18px}
.code{margin-top:18px;background:#0a1124;border:1px dashed var(--brand);border-radius:12px;
  padding:16px;text-align:center;font-size:22px;letter-spacing:2px;color:var(--brand2);font-weight:800}
.code small{display:block;font-size:12px;color:var(--muted);letter-spacing:0;font-weight:500;margin-top:8px}
.demo{font-size:12px;color:var(--warn);margin-top:10px}

footer{border-top:1px solid var(--line);padding:34px 0;color:var(--muted);font-size:13px}
.foot{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}

@media(max-width:880px){
  .grid,.secbar,.steps,.price,.distgrid{grid-template-columns:1fr}
  .nav .links{display:none}
}