*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#ffffff;--ink:#101010;--mut:#666;--ac:#ff5a1f;--soft:#fff3ec;--bd:#ececec}
html{scroll-behavior:smooth}body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
a{color:inherit;text-decoration:none}.container{max-width:1000px;margin:0 auto;padding:0 26px}.xh-narrow{max-width:720px}
.xh-nav{position:sticky;top:0;z-index:50;background:#fff;border-bottom:3px solid var(--ink)}.xh-nav .container{display:flex;align-items:center;height:70px}.xh-logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px}.xh-logo img{border-radius:8px}.xh-cta{margin-left:auto;background:var(--ac);color:#fff;font-weight:800;padding:11px 22px;border-radius:4px}.xh-cta:hover{background:#e64a13}
.xh-hero{padding:90px 0 80px;border-bottom:3px solid var(--ink)}
.xh-hero h1{font-size:clamp(40px,8vw,84px);line-height:.98;font-weight:900;letter-spacing:-2px}.xh-hero h1 em{color:var(--ac);font-style:normal}
.xh-hero p{max-width:560px;margin:26px 0;font-size:19px;color:var(--mut)}
.xh-hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:30px}.xh-hero-meta span{border:2px solid var(--ink);padding:6px 14px;font-weight:700;font-size:14px;border-radius:4px}
.xh-big{display:inline-block;font-size:18px;padding:16px 34px}
.xh-sec{padding:80px 0}.xh-dark{background:var(--ink);color:#fff}.xh-h2{font-size:clamp(26px,4vw,40px);font-weight:900;letter-spacing:-1px;margin-bottom:40px}.xh-w{color:#fff}
.xh-feats{display:flex;flex-direction:column}
.xh-feat{display:flex;gap:26px;align-items:flex-start;padding:28px 0;border-top:2px solid var(--bd)}.xh-feat:last-child{border-bottom:2px solid var(--bd)}
.xh-n{font-size:46px;font-weight:900;color:var(--ac);line-height:1;min-width:70px}.xh-feat h3{font-size:23px;font-weight:800}.xh-feat p{color:var(--mut);margin-top:6px}
.xh-nodeband{background:var(--soft);padding:60px 0;text-align:center;border-top:3px solid var(--ink);border-bottom:3px solid var(--ink)}.xh-nodeband h2{font-size:26px;font-weight:900}.xh-nodeband p{color:var(--mut);margin-top:10px;max-width:680px;margin-inline:auto}
.xh-dl{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.dl-card{display:flex;align-items:center;gap:16px;background:#1c1c1c;border:2px solid #333;border-radius:8px;padding:22px;transition:.18s}.dl-card:hover{border-color:var(--ac);background:#241a14}
.dl-ic{font-size:34px}.dl-card h3{font-size:19px;color:#fff}.dl-meta{color:#aaa;font-size:13px}
.xh-faq details{border-bottom:2px solid var(--bd);padding:4px 0}.xh-faq summary{cursor:pointer;font-weight:800;font-size:18px;padding:18px 0;list-style:none}.xh-faq summary::-webkit-details-marker{display:none}.xh-faq p{color:var(--mut);padding-bottom:18px}
.flinks{background:var(--soft);padding:36px 0;border-top:3px solid var(--ink)}.flinks h2{font-size:15px;color:var(--mut);margin-bottom:14px;font-weight:700}.flinks-list{display:flex;flex-wrap:wrap;gap:10px 24px}.flinks-list a{color:var(--ac);font-weight:700;font-size:15px}.flinks-list a:hover{text-decoration:underline}
.ft{background:var(--ink);color:#bbb;padding:32px 0;text-align:center}.ft-brand{display:flex;align-items:center;justify-content:center;gap:8px;font-weight:900;color:#fff;margin-bottom:8px}.ft-brand img{border-radius:7px}.ft-copy{font-size:13px}
@media(max-width:700px){.xh-dl{grid-template-columns:1fr}.xh-feat{gap:16px}.xh-n{font-size:34px;min-width:50px}}
/* 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)}