:root{
  --bg:#0f0f18; --panel:#171722; --card:#1d1d29; --card-hov:#272737;
  --field:#2b2b3c; --accent:#00c694; --accent2:#34d399;
  --text:#eaeaf5; --muted:#9494aa; --danger:#f87171; --line:#2a2a3a;
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;
  background:var(--bg); color:var(--text); line-height:1.75;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
a{color:var(--accent);text-decoration:none}
img{max-width:100%;display:block}
::selection{background:rgba(0,198,148,.3)}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:100;background:rgba(15,15,24,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;color:var(--text);letter-spacing:1px}
.logo img{width:30px;height:30px;border-radius:50%;box-shadow:0 0 0 1px var(--line)}
.logo b{color:var(--accent);font-weight:800}
.logo small{font-size:12px;color:var(--muted);font-weight:400;margin-left:2px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{color:var(--muted);padding:8px 14px;border-radius:8px;font-size:14px;transition:.15s}
.nav-links a:hover{color:var(--text);background:var(--card)}
.nav-links a.active{color:var(--accent);background:rgba(0,198,148,.12)}
.nav-links a.nav-cta{color:#04140f;background:var(--accent);font-weight:700}
.nav-links a.nav-cta:hover{background:var(--accent2);color:#04140f}
.nav-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);font-size:20px;width:40px;height:36px;border-radius:8px;cursor:pointer}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:72px 0 56px;text-align:center}
.hero::before{
  content:"";position:absolute;inset:-30% -20% auto;height:520px;
  background:radial-gradient(ellipse at center,rgba(0,198,148,.16),transparent 65%);
  pointer-events:none;
}
.hero .logo-big{width:120px;height:120px;border-radius:50%;margin:0 auto 28px;position:relative;
  box-shadow:0 0 60px rgba(0,198,148,.35),0 0 0 1px rgba(0,198,148,.25)}
.hero h1{font-size:52px;font-weight:900;letter-spacing:2px;position:relative;line-height:1.2}
.hero .grad{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{max-width:660px;margin:20px auto 0;color:var(--muted);font-size:17px;position:relative}
.hero .tags{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:28px 0 0;position:relative}
.tag{padding:6px 16px;border:1px solid var(--line);border-radius:20px;font-size:13px;color:var(--muted);background:var(--card)}
.cta{margin-top:34px;position:relative;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.meta{font-size:13px;color:var(--muted);margin-top:16px;position:relative}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;
  background:var(--accent);color:#04140f;font-weight:700;font-size:16px;
  padding:14px 32px;border-radius:10px;border:none;transition:.2s;
  box-shadow:0 8px 24px rgba(0,198,148,.28);
}
.btn:hover{background:var(--accent2);transform:translateY(-2px)}
.btn.ghost{background:var(--field);color:var(--text);box-shadow:none}
.btn.ghost:hover{background:var(--card-hov)}
.btn.sm{padding:9px 18px;font-size:14px}

/* ---------- sections ---------- */
section{padding:60px 0}
.sec-title{text-align:center;margin-bottom:42px}
.sec-title h2{font-size:30px;font-weight:800;letter-spacing:.5px}
.sec-title h2 .grad{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-title p{color:var(--muted);margin-top:10px;font-size:15px}

/* ---------- cards ---------- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:.2s}
.card:hover{background:var(--card-hov);transform:translateY(-4px);border-color:var(--accent)}
.card .ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px;background:rgba(0,198,148,.14)}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px}
.card ul{list-style:none;margin-top:12px}
.card ul li{color:var(--muted);font-size:13.5px;padding:4px 0 4px 18px;position:relative}
.card ul li::before{content:"✓";color:var(--accent);position:absolute;left:0;font-weight:700}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;position:relative;transition:.2s}
.step:hover{border-color:var(--accent);transform:translateY(-3px)}
.step .n{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#04140f;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px;font-size:16px}
.step h3{font-size:17px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14px}

/* ---------- download block ---------- */
.dl{background:linear-gradient(160deg,var(--card),#141420);border:1px solid var(--line);border-radius:18px;padding:52px 24px;text-align:center}
.dl h2{font-size:30px;font-weight:800;margin-bottom:8px}
.dl p{color:var(--muted);margin-bottom:26px}
.dl .file{display:inline-flex;align-items:center;gap:10px;background:var(--field);border-radius:10px;padding:12px 20px;font-size:14px;margin-top:20px;color:var(--text)}
.dl .badge{display:inline-flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:18px}
.dl .badge span{font-size:12px;color:var(--muted);border:1px solid var(--line);padding:4px 12px;border-radius:16px}

/* ---------- note / doc ---------- */
.note{max-width:780px;margin:36px auto 0;color:var(--muted);font-size:13.5px;text-align:left;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px 26px}
.note b{color:var(--accent)}
.note li{margin:7px 0 7px 20px}
.note h4{color:var(--text);font-size:15px;margin:16px 0 8px}
.note h4:first-child{margin-top:0}
.warn{color:var(--danger)}

/* ---------- doc layout ---------- */
.doc{display:grid;grid-template-columns:240px 1fr;gap:28px;align-items:start}
.toc{position:sticky;top:84px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}
.toc h4{font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px}
.toc a{display:block;color:var(--muted);font-size:14px;padding:7px 10px;border-radius:7px;transition:.15s}
.toc a:hover{color:var(--text);background:var(--card-hov)}
.article h2{font-size:26px;font-weight:800;margin:0 0 16px}
.article h3{font-size:19px;font-weight:700;margin:32px 0 12px;color:var(--text);display:flex;align-items:center;gap:10px}
.article h3::before{content:"";width:4px;height:20px;background:var(--accent);border-radius:2px}
.article p{color:var(--muted);font-size:15px;margin-bottom:12px}
.article .card{margin-bottom:0}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:36px 0;text-align:center;color:var(--muted);font-size:13px}
.foot-nav{display:flex;justify-content:center;gap:24px;margin-bottom:14px;flex-wrap:wrap}
.foot-nav a{color:var(--muted);font-size:13px}
.foot-nav a:hover{color:var(--accent)}

/* ---------- responsive ---------- */
@media(max-width:860px){
  .grid,.steps{grid-template-columns:1fr 1fr}
  .doc{grid-template-columns:1fr}
  .toc{position:static}
  .hero h1{font-size:40px}
}
@media(max-width:640px){
  .grid,.steps{grid-template-columns:1fr}
  .hero h1{font-size:34px}
  .nav-toggle{display:block}
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;background:var(--panel);border-bottom:1px solid var(--line);padding:12px 16px;gap:6px;
  }
  .nav-links.open{display:flex}
  .nav-links a{width:100%}
}