:root { --bg:#0d1017; --fg:#e8eaf0; --dim:#9aa3b5; --accent:#6366f1; --card:#151a26; }
* { box-sizing:border-box; margin:0; }
body { background:var(--bg); color:var(--fg);
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif; line-height:1.7; }
.nav { display:flex; justify-content:space-between; align-items:center;
  padding:18px 6vw; position:sticky; top:0; background:rgba(13,16,23,.85); backdrop-filter:blur(8px); }
.brand { font-weight:700; letter-spacing:.5px; }
.nav-cta { color:var(--fg); text-decoration:none; border:1px solid #2a3348; border-radius:8px; padding:6px 14px; font-size:14px; }
section { padding:9vh 6vw; max-width:1080px; margin:0 auto; }
section.flow { padding-top:4vh; }
.hero h1 { font-size:clamp(30px,5vw,52px); line-height:1.25; letter-spacing:.5px; }
.accent { color:var(--accent); }
.sub { color:var(--dim); max-width:640px; margin:22px 0 30px; font-size:17px; }
.dl { display:flex; gap:14px; align-items:center; flex-wrap:wrap; }
.btn { border-radius:10px; padding:13px 26px; font-size:16px; text-decoration:none; }
.btn.primary { background:var(--accent); color:#fff; font-weight:600; }
.btn.primary:hover { filter:brightness(1.1); }
.btn.disabled { border:1px dashed #2a3348; color:var(--dim); padding:12px 20px; font-size:14px; }
.btn.big { font-size:18px; padding:16px 34px; }
.ver { color:var(--dim); margin-top:14px; font-size:13px; }
h2 { font-size:clamp(22px,3vw,32px); margin-bottom:28px; }
.steps { list-style:none; display:grid; grid-template-columns:repeat(3,1fr); gap:18px; counter-reset:s; }
.steps li { background:var(--card); border-radius:12px; padding:22px; counter-increment:s; }
.steps li::before { content:counter(s); display:block; color:var(--accent); font-size:26px; font-weight:700; margin-bottom:8px; }
.steps b { display:block; margin-bottom:6px; }
.steps span, .card span { color:var(--dim); font-size:15px; }
.cards { display:grid; grid-template-columns:repeat(2,1fr); gap:18px; }
.card { background:var(--card); border-radius:12px; padding:26px; }
.card b { display:block; font-size:18px; margin-bottom:8px; }
.cta { text-align:center; }
.cta .dl { justify-content:center; }
.req { color:var(--dim); font-size:13px; margin-top:16px; }
.foot { text-align:center; color:#5c6478; font-size:12px; padding:26px; border-top:1px solid #1b2233; }
@media (max-width:760px){ .steps,.cards{ grid-template-columns:1fr; } }