*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#f3f8ff;--surf:#fff;--tx:#0f2438;--mut:#5b7088;--ac:#1f7ae0;--ac2:#5eb3f5;--bd:#e1ecf7}
html{scroll-behavior:smooth}body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--tx);line-height:1.75}
a{color:inherit;text-decoration:none}.container{max-width:1080px;margin:0 auto;padding:0 24px}.ww-narrow{max-width:740px}
.ww-nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--bd)}.ww-nav .container{display:flex;align-items:center;height:66px}.ww-logo{display:flex;align-items:center;gap:9px;font-size:19px;font-weight:800}.ww-logo img{border-radius:8px}.ww-nav nav{margin-left:auto;display:flex;align-items:center;gap:24px;color:var(--mut)}.ww-nav nav a:hover{color:var(--ac)}
.ww-cta{background:linear-gradient(135deg,var(--ac),var(--ac2));color:#fff!important;padding:11px 24px;border-radius:999px;font-weight:700;box-shadow:0 6px 18px rgba(31,122,224,.3)}
.ww-hero{position:relative;text-align:center;padding:90px 0 120px;background:linear-gradient(180deg,#eaf4ff,#f3f8ff)}
.ww-hero h1{font-size:clamp(32px,5vw,52px);font-weight:900;color:#103a66}.ww-sub{max-width:620px;margin:20px auto 0;color:var(--mut);font-size:18px}
.ww-hero-btn{display:flex;gap:18px;justify-content:center;align-items:center;margin-top:30px}.ww-link{color:var(--ac);font-weight:600}
.ww-stats{display:flex;justify-content:center;gap:48px;margin-top:50px}.ww-stats b{display:block;font-size:30px;color:var(--ac);font-weight:900}.ww-stats span{color:var(--mut);font-size:14px}
.ww-wave{position:absolute;bottom:-1px;left:0;right:0;height:60px;background:var(--bg);clip-path:ellipse(75% 100% at 50% 100%)}
.ww-sec{padding:80px 0}.ww-band{padding:80px 0;background:#e9f3ff}.ww-h2{text-align:center;font-size:clamp(24px,3.4vw,32px);font-weight:800;color:#103a66}.ww-lead{text-align:center;color:var(--mut);margin-top:12px}
.ww-rows{margin-top:46px;display:flex;flex-direction:column;gap:26px}
.ww-row{display:flex;align-items:center;gap:30px;background:var(--surf);border:1px solid var(--bd);border-radius:20px;padding:30px 36px;box-shadow:0 8px 30px rgba(16,58,102,.06)}.ww-rev{flex-direction:row-reverse;text-align:right}
.ww-row-ic{font-size:48px;width:90px;height:90px;flex:none;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eaf4ff,#d6e9ff);border-radius:20px}
.ww-row-tx h3{font-size:21px;color:#103a66}.ww-row-tx p{color:var(--mut);margin-top:6px}
.ww-nodes{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:34px}.ww-node{background:var(--surf);border:1px solid var(--bd);padding:11px 20px;border-radius:999px;font-weight:600;color:#103a66}
.ww-dl{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:40px}
.dl-card{display:block;text-align:center;background:var(--surf);border:1px solid var(--bd);border-radius:18px;padding:30px 16px;transition:.2s;box-shadow:0 8px 24px rgba(16,58,102,.05)}.dl-card:hover{transform:translateY(-5px);border-color:var(--ac);box-shadow:0 16px 40px rgba(31,122,224,.18)}
.dl-ic{font-size:40px}.dl-card h3{margin:10px 0 4px;color:#103a66}.dl-meta{color:var(--mut);font-size:13px}
.ww-faq{margin-top:34px}.ww-faq details{background:var(--surf);border:1px solid var(--bd);border-radius:14px;padding:2px 22px;margin-bottom:14px}.ww-faq summary{cursor:pointer;font-weight:700;padding:18px 0;list-style:none;color:#103a66}.ww-faq summary::-webkit-details-marker{display:none}.ww-faq p{color:var(--mut);padding-bottom:18px}
.flinks{background:#e3eefb;padding:34px 0}.flinks h2{font-size:15px;color:var(--mut);margin-bottom:14px;font-weight:600;text-align:center}.flinks-list{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 22px}.flinks-list a{color:var(--ac);font-size:14px}.flinks-list a:hover{text-decoration:underline}
.ft{background:#103a66;color:#cfe3fa;padding:32px 0;text-align:center}.ft-brand{display:flex;align-items:center;justify-content:center;gap:8px;font-weight:800;color:#fff;margin-bottom:8px}.ft-brand img{border-radius:7px}.ft-copy{font-size:13px;opacity:.85}
@media(max-width:820px){.ww-dl{grid-template-columns:1fr 1fr}.ww-row,.ww-rev{flex-direction:column;text-align:center}.ww-nav nav a:not(.ww-cta){display:none}.ww-stats{gap:28px}}
@media(max-width:480px){.ww-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)}