:root{--bg:#0b1220;--bg2:#0f1a2e;--card:#111d33;--line:#1f2f4d;--tx:#e8eefc;--mut:#8ea0c2;--ac:#10b981;--ac2:#34d399;--r:14px}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--tx);font:16px/1.65 system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}.center{text-align:center}
.nav{position:sticky;top:0;z-index:10;background:rgba(11,18,32,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.logo{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--ac)}
.links{display:flex;gap:22px;margin-left:auto;color:var(--mut);font-size:15px}
.links a:hover{color:var(--tx)}
.btn{display:inline-block;padding:12px 24px;border-radius:10px;background:var(--ac);color:#04231a;font-weight:700;border:0;cursor:pointer;font-size:16px;transition:.15s}
.btn:hover{background:var(--ac2);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--tx);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--card)}
.btn-sm{padding:8px 16px;font-size:14px}
.btn-block{display:block;text-align:center;width:100%;margin:16px 0 8px}
.btn.off{opacity:.55;pointer-events:none}
.hero{padding:84px 0 64px;background:radial-gradient(800px 320px at 50% -60px,rgba(16,185,129,.22),transparent)}
.hero-in{text-align:center}
.badge{display:inline-block;padding:4px 14px;border:1px solid var(--line);border-radius:99px;color:var(--ac2);font-size:13px;margin-bottom:20px}
h1{font-size:clamp(30px,6vw,52px);line-height:1.2;font-weight:800}
.grad{background:linear-gradient(90deg,var(--ac),#38bdf8);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{max-width:560px;margin:18px auto 28px;color:var(--mut);font-size:18px}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.pills{list-style:none;padding:0;display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:28px}
.pills li{padding:6px 14px;border-radius:99px;background:var(--card);border:1px solid var(--line);color:var(--mut);font-size:14px}
.sec{padding:64px 0}.alt{background:var(--bg2)}
h2{font-size:30px;margin-bottom:8px}
.sub{color:var(--mut);margin-bottom:28px}
h3{font-size:18px;margin-bottom:6px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.calc{display:grid;grid-template-columns:1.2fr 1fr;gap:32px}
.lbl{display:block;font-weight:600;margin:18px 0 8px;font-size:14px;color:var(--mut)}
.lbl:first-child{margin-top:0}
input{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--tx);font-size:16px}
input:focus{outline:2px solid var(--ac);border-color:transparent}
.hint{min-height:20px;font-size:13px;color:var(--mut);margin-top:6px}
.hint.bad{color:#f87171}.hint.ok{color:var(--ac2)}
.presets{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.preset,.seg button{padding:10px 8px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--tx);cursor:pointer;font-size:14px;line-height:1.3}
.preset small{display:block;color:var(--mut);font-size:12px}
.preset.on,.seg button.on{border-color:var(--ac);background:rgba(16,185,129,.12)}
.seg{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.quote{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:18px}
.row,.save{display:flex;justify-content:space-between;align-items:baseline;padding:8px 0}
.row b{font-size:22px}.muted{color:var(--mut);text-decoration:line-through}
.save{border-top:1px dashed var(--line);margin-top:6px;padding-top:14px;color:var(--ac2)}
.save b{font-size:20px}
.small{font-size:12.5px;color:var(--mut);margin-top:8px}
.pay{margin-top:14px}
.copyrow{display:flex;gap:8px;align-items:center;margin-top:6px}
code{flex:1;word-break:break-all;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:13px}
.steps,.grid{display:grid;gap:16px}
.steps{grid-template-columns:repeat(3,1fr);margin-top:24px}
.grid{grid-template-columns:repeat(4,1fr);margin-bottom:24px}
.card p{color:var(--mut);font-size:15px}
.n{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--ac);color:#04231a;font-weight:800;margin-bottom:12px}
.table-card{padding:6px 12px;overflow-x:auto}
table{width:100%;border-collapse:collapse;min-width:420px}
th,td{padding:14px 12px;text-align:left;border-bottom:1px solid var(--line)}
tr:last-child td{border:0}th{color:var(--mut);font-weight:600;font-size:14px}
.hl td{color:var(--ac2);font-weight:600}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-top:12px}
summary{cursor:pointer;font-weight:600}
details p{color:var(--mut);margin-top:10px;font-size:15px}
.final .btn{margin:0 6px}
.foot{padding:32px 0;border-top:1px solid var(--line);color:var(--mut);font-size:13px;text-align:center}
.foot p+p{margin-top:6px}
@media(max-width:820px){
  .links{display:none}.nav-in{justify-content:space-between}
  .calc{grid-template-columns:1fr;gap:20px}
  .steps{grid-template-columns:1fr}.grid{grid-template-columns:1fr 1fr}
  .hero{padding:56px 0 40px}.sec{padding:44px 0}
}
@media(max-width:480px){.grid{grid-template-columns:1fr}.seg{grid-template-columns:repeat(3,1fr)}}