*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#070d0b;--surf:#10201a;--surf2:#16271f;--tx:#e8f5ef;--mut:#8fb6a6;--ac:#16e0a3;--ac2:#0bbd86;--bd:rgba(22,224,163,.16)}
html{scroll-behavior:smooth}body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--tx);line-height:1.7}
a{color:inherit;text-decoration:none}.container{max-width:1140px;margin:0 auto;padding:0 24px}.lt-narrow{max-width:760px}
.lt-nav{position:sticky;top:0;z-index:50;background:rgba(7,13,11,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--bd)}
.lt-nav .container{display:flex;align-items:center;gap:24px;height:66px}.lt-logo{display:flex;align-items:center;gap:9px;font-size:19px}.lt-logo img{border-radius:8px}
.lt-nav nav{display:flex;gap:26px;margin-left:auto;color:var(--mut)}.lt-nav nav a:hover{color:var(--ac)}
.lt-cta{background:linear-gradient(135deg,var(--ac),var(--ac2));color:#062018;font-weight:800;padding:11px 22px;border-radius:8px;transition:.15s}.lt-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(22,224,163,.35)}
.lt-ghost{border:1px solid var(--bd);padding:11px 22px;border-radius:8px;color:var(--tx)}
.lt-hero{padding:80px 0;background:radial-gradient(800px 420px at 78% 0%,rgba(22,224,163,.18),transparent 60%)}
.lt-hero-in{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.lt-badge{display:inline-block;background:var(--surf);border:1px solid var(--bd);color:var(--ac);padding:6px 14px;border-radius:999px;font-size:13px;font-weight:700}
.lt-hero h1{font-size:clamp(30px,4.6vw,50px);line-height:1.18;margin:18px 0;font-weight:900;letter-spacing:-.5px}
.lt-hero p{color:var(--mut);max-width:540px}.lt-hero-btn{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap}
.lt-hero-logo{text-align:center}.lt-hero-logo img{filter:drop-shadow(0 20px 50px rgba(22,224,163,.35))}
.lt-strip .container{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--bd);border:1px solid var(--bd);border-radius:14px;overflow:hidden;margin-top:-20px}
.lt-strip div{background:var(--surf);padding:22px;text-align:center}.lt-strip b{display:block;font-size:26px;color:var(--ac);font-weight:900}.lt-strip span{font-size:13px;color:var(--mut)}
.lt-sec{padding:78px 0}.lt-alt{background:var(--surf)}.lt-h2{font-size:clamp(24px,3.4vw,34px);font-weight:900;margin-bottom:8px}.lt-lead{color:var(--mut);margin-bottom:34px}
.lt-feats{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:36px}
.lt-feat{display:flex;gap:16px;background:var(--surf2);border-left:3px solid var(--ac);border-radius:0 12px 12px 0;padding:22px}
.lt-ic{font-size:26px}.lt-feat h3{font-size:18px;margin-bottom:5px}.lt-feat p{color:var(--mut);font-size:14px}
.lt-nodes{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}.lt-node{background:var(--surf2);border:1px solid var(--bd);padding:12px 18px;border-radius:10px;font-weight:600}
.lt-steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:36px;counter-reset:s}
.lt-steps li{background:var(--surf2);border:1px solid var(--bd);border-radius:14px;padding:24px}.lt-steps b{color:var(--ac);font-size:30px;font-weight:900}.lt-steps h3{margin:8px 0 6px;font-size:17px}.lt-steps p{color:var(--mut);font-size:14px}
.lt-dl{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:30px}
.dl-card{background:var(--surf2);border:1px solid var(--bd);border-radius:14px;padding:28px 16px;text-align:center;transition:.2s;display:block}.dl-card:hover{transform:translateY(-4px);border-color:var(--ac)}
.dl-ic{font-size:38px}.dl-card h3{margin:8px 0 4px;font-size:18px}.dl-meta{color:var(--mut);font-size:13px}
.lt-faq details{background:var(--surf2);border:1px solid var(--bd);border-radius:12px;padding:2px 20px;margin-bottom:12px}.lt-faq summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none}.lt-faq summary::-webkit-details-marker{display:none}.lt-faq p{color:var(--mut);padding-bottom:16px}
.flinks{background:var(--surf);border-top:1px solid var(--bd);padding:34px 0}.flinks h2{font-size:15px;color:var(--mut);margin-bottom:14px;font-weight:600}.flinks-list{display:flex;flex-wrap:wrap;gap:10px 22px}.flinks-list a{color:var(--ac);font-size:14px}.flinks-list a:hover{text-decoration:underline}
.ft{background:var(--bg);border-top:1px solid var(--bd);padding:30px 0;text-align:center}.ft-brand{display:flex;align-items:center;justify-content:center;gap:8px;font-weight:800;margin-bottom:8px}.ft-brand img{border-radius:7px}.ft-copy{color:var(--mut);font-size:13px}
@media(max-width:900px){.lt-hero-in{grid-template-columns:1fr}.lt-hero-logo{display:none}.lt-feats,.lt-steps,.lt-dl,.lt-strip .container{grid-template-columns:1fr 1fr}.lt-nav nav{display:none}}
@media(max-width:560px){.lt-feats,.lt-steps,.lt-dl{grid-template-columns:1fr}}
/* hero quick-download row */
.hero-dl{display:flex;flex-wrap:wrap;gap:14px;margin:34px 0 38px;justify-content:center}.hdl{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;border-radius:10px;border:1.5px solid var(--ac);color:var(--ac);font-weight:700;font-size:16px;background:rgba(128,128,128,.05);transition:.15s}.hdl:hover{background:var(--ac);color:#fff;transform:translateY(-2px)}