*{box-sizing:border-box;margin:0;padding:0}
html,body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Helvetica,Arial,sans-serif;color:#0f172a;background:#fff;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
:root{--brand:#0ea5e9;--brand-dk:#0284c7;--ink:#0f172a;--sub:#64748b;--line:#e2e8f0;--soft:#f1f5f9}
/* header */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo img{height:30px}
.nav{display:flex;gap:30px;align-items:center}
.nav a{font-size:15px;color:#334155;font-weight:500;transition:color .2s}
.nav a:hover,.nav a.active{color:var(--brand)}
.nav .cta{background:var(--brand);color:#fff;padding:9px 20px;border-radius:10px;font-size:14px}
.nav .cta:hover{background:var(--brand-dk);color:#fff}
/* hero */
.hero{position:relative;text-align:center;padding:120px 24px 90px;overflow:hidden;background:radial-gradient(1200px 500px at 50% -10%,#e0f2fe 0%,transparent 60%)}
.hero h1{font-size:48px;font-weight:800;color:var(--ink);letter-spacing:-.02em;margin-bottom:22px;background:linear-gradient(90deg,#0f172a 0%,#0284c7 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero .lead{color:var(--sub);font-size:18px;max-width:720px;margin:0 auto 34px}
.btn-primary{display:inline-flex;align-items:center;gap:10px;background:var(--brand);color:#fff;padding:16px 34px;border-radius:12px;font-size:17px;font-weight:700;box-shadow:0 12px 24px -8px rgba(14,165,233,.45);transition:transform .2s,box-shadow .2s}
.btn-primary:hover{transform:translateY(-2px);color:#fff;box-shadow:0 16px 30px -8px rgba(14,165,233,.55)}
.plat-row{display:flex;justify-content:center;align-items:center;gap:20px;margin-top:26px;color:var(--sub);font-size:14px;flex-wrap:wrap}
.plat-row a{padding:4px 8px;transition:color .2s}
.plat-row a:hover{color:var(--brand)}
.plat-row .sep{width:1px;height:12px;background:#cbd5e1}
/* sections */
.sec{padding:88px 24px}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .kicker{display:inline-block;padding:6px 14px;border-radius:999px;background:#e0f2fe;color:var(--brand-dk);font-size:13px;font-weight:700;margin-bottom:16px;letter-spacing:.05em}
.sec-head h2{font-size:36px;font-weight:800;color:var(--ink);letter-spacing:-.01em;margin-bottom:14px}
.sec-head p{color:var(--sub);font-size:16px;max-width:720px;margin:0 auto}
.sec-alt{background:linear-gradient(180deg,#f8fafc 0%,#fff 100%)}
/* feature grid */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;transition:transform .2s,box-shadow .2s,border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 24px 40px -22px rgba(2,132,199,.2);border-color:#bae6fd}
.card img{width:56px;height:56px;object-fit:contain;margin-bottom:18px}
.card h4{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:10px}
.card p{color:var(--sub);font-size:14px;line-height:1.75}
/* about split */
.about{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center;max-width:1100px;margin:0 auto}
.about h2{font-size:34px;font-weight:800;color:var(--ink);margin-bottom:18px;letter-spacing:-.01em}
.about p{color:#475569;margin-bottom:14px;font-size:15px}
.about .stat{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px}
.about .stat div{background:#f8fafc;border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center}
.about .stat strong{display:block;font-size:26px;color:var(--brand-dk);font-weight:800}
.about .stat span{color:var(--sub);font-size:13px}
.about .pic{background:linear-gradient(135deg,#e0f2fe,#f0f9ff);border-radius:24px;padding:40px;border:1px solid #bae6fd}
/* showcase */
.showcase{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:64px 0;border-bottom:1px solid #f1f5f9}
.showcase:last-child{border-bottom:none}
.showcase.reverse{direction:rtl}.showcase.reverse>*{direction:ltr}
.showcase .txt h3{font-size:28px;font-weight:800;color:var(--ink);margin-bottom:16px}
.showcase .txt p{color:var(--sub);font-size:15px;margin-bottom:18px}
.showcase .txt ul{list-style:none}
.showcase .txt li{padding-left:22px;position:relative;color:#475569;font-size:14px;margin-bottom:8px}
.showcase .txt li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;background:var(--brand);border-radius:3px}
.showcase .pic{background:#f8fafc;border-radius:20px;overflow:hidden;padding:20px;border:1px solid var(--line)}
/* faq */
.faq{max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 24px;margin-bottom:14px}
.faq details[open]{box-shadow:0 10px 24px -12px rgba(2,132,199,.15);border-color:#bae6fd}
.faq summary{cursor:pointer;font-weight:600;color:var(--ink);font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::after{content:"+";font-size:24px;color:var(--brand);font-weight:300}
.faq details[open] summary::after{content:"−"}
.faq p{color:var(--sub);margin-top:14px;font-size:14px}
/* cta band */
.cta-band{background:linear-gradient(120deg,#0ea5e9 0%,#0369a1 100%);color:#fff;text-align:center;padding:70px 24px;border-radius:24px;margin:40px auto;max-width:1200px}
.cta-band h2{font-size:32px;font-weight:800;margin-bottom:14px}
.cta-band p{opacity:.9;margin-bottom:28px}
.cta-band .btn-primary{background:#fff;color:var(--brand-dk);box-shadow:0 10px 20px -6px rgba(0,0,0,.2)}
.cta-band .btn-primary:hover{color:var(--brand-dk)}
/* footer */
.site-footer{background:#0b1220;color:#94a3b8;padding:64px 24px 30px;margin-top:40px}
.ft-main{display:grid;grid-template-columns:1.4fr 3fr;gap:40px;padding-bottom:36px;border-bottom:1px solid #1e293b}
.ft-left .ft-logo{height:30px;margin-bottom:16px;filter:brightness(0) invert(1)}
.ft-left p{font-size:13px;line-height:1.8;max-width:320px}
.ft-links{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.ft-list{list-style:none;font-size:13px}
.ft-list .ft-title{color:#e5e7eb;font-weight:700;margin-bottom:14px;font-size:14px}
.ft-list li{margin-bottom:10px}
.ft-list a{color:#94a3b8;transition:color .2s}
.ft-list a:hover{color:#fff}
.ft-copyright{padding-top:22px;font-size:12px;color:#64748b;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.ft-copyright a{color:#94a3b8;margin:0 6px}
.ft-copyright a:hover{color:#fff}
/* generic page hero */
.page-hero{padding:80px 24px 44px;text-align:center;background:linear-gradient(180deg,#e0f2fe 0%,#fff 100%)}
.page-hero h1{font-size:40px;font-weight:800;color:var(--ink);margin-bottom:12px;letter-spacing:-.01em}
.page-hero p{color:var(--sub);max-width:720px;margin:0 auto}
/* legal */
.legal{max-width:840px;margin:40px auto 60px;padding:0 24px}
.legal h2{font-size:20px;font-weight:700;color:var(--ink);margin:32px 0 12px}
.legal p{color:#475569;font-size:15px;margin-bottom:12px}
.legal ul{padding-left:20px;color:#475569;font-size:15px;margin-bottom:12px}
.legal ul li{margin-bottom:6px}
/* changelog */
.log-list{max-width:900px;margin:40px auto 60px;padding:0 24px}
.log-item{display:grid;grid-template-columns:180px 1fr;gap:24px;padding:28px 0;border-bottom:1px dashed var(--line)}
.log-ver strong{display:block;font-size:22px;color:var(--brand-dk);font-weight:800}
.log-ver span{color:#9ca3af;font-size:13px}
.log-body h3{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:12px}
.log-body ul{padding-left:20px;color:#475569;font-size:14px}
.log-body li{margin-bottom:6px}
/* download page - card grid */
.dl-grid{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.dl-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:32px;transition:transform .2s,box-shadow .2s,border-color .2s;display:flex;flex-direction:column;gap:14px}
.dl-card:hover{transform:translateY(-4px);box-shadow:0 24px 40px -22px rgba(2,132,199,.2);border-color:#bae6fd}
.dl-card .top{display:flex;gap:18px;align-items:center}
.dl-card .top img{width:74px;height:74px;object-fit:contain}
.dl-card h3{font-size:22px;font-weight:800;color:var(--ink)}
.dl-card .tag{color:var(--brand-dk);font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase}
.dl-card p{color:var(--sub);font-size:14px}
.dl-card .meta{font-size:12px;color:#94a3b8}
.dl-card .btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto;padding-top:8px}
.dl-card .btns a{padding:11px 22px;border-radius:10px;font-size:14px;font-weight:600;background:var(--brand);color:#fff;transition:background .2s}
.dl-card .btns a.ghost{background:#f1f5f9;color:#334155}
.dl-card .btns a:hover{background:var(--brand-dk);color:#fff}
.dl-card .btns a.ghost:hover{background:#e2e8f0;color:var(--ink)}
/* app page */
.qr-row{display:flex;justify-content:center;gap:36px;margin-top:36px;flex-wrap:wrap}
.qr{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;width:220px;text-align:center;box-shadow:0 12px 30px -20px rgba(0,0,0,.15)}
.qr img{width:170px;height:170px;margin:0 auto 12px}
.qr strong{display:block;color:var(--ink);font-size:16px;margin-bottom:4px}
.qr span{color:#94a3b8;font-size:12px}
/* vip pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:1050px;margin:0 auto}
.plan{background:#fff;border:1px solid var(--line);border-radius:20px;padding:32px;position:relative}
.plan.featured{border-color:var(--brand);box-shadow:0 20px 40px -20px rgba(14,165,233,.25);transform:translateY(-6px)}
.plan .badge{position:absolute;top:-12px;right:22px;background:var(--brand);color:#fff;font-size:12px;padding:4px 12px;border-radius:999px;font-weight:700}
.plan h3{font-size:20px;color:var(--ink);margin-bottom:8px;font-weight:800}
.plan .price{font-size:36px;font-weight:800;color:var(--brand-dk);margin:16px 0}
.plan .price small{font-size:14px;color:var(--sub);font-weight:500}
.plan ul{list-style:none;margin:20px 0}
.plan li{padding:8px 0;color:#475569;font-size:14px;border-bottom:1px dashed var(--line)}
.plan li::before{content:"✓ ";color:var(--brand)}
.plan a{display:block;text-align:center;background:var(--brand);color:#fff;padding:12px;border-radius:10px;font-weight:600;margin-top:8px}
.plan a:hover{background:var(--brand-dk);color:#fff}
/* enterprise */
.ent-feats{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;max-width:1000px;margin:0 auto}
.ent-feats .card{padding:26px}
/* license */
.license-wrap{max-width:820px;margin:40px auto 60px;padding:0 24px;text-align:center}
.license-wrap .frame{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 20px 40px -24px rgba(0,0,0,.12)}
.license-wrap p{color:var(--sub);font-size:14px;margin-top:16px}
/* contact */
.contact-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;max-width:1000px;margin:0 auto;align-items:start}
.contact-info{background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px}
.contact-info h3{font-size:20px;font-weight:700;color:var(--ink);margin-bottom:18px}
.contact-info dl{display:grid;grid-template-columns:110px 1fr;gap:14px 12px}
.contact-info dt{color:#94a3b8;font-size:14px}
.contact-info dd{color:#334155;font-size:14px}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px}
.contact-form label{display:block;color:#334155;font-size:13px;font-weight:600;margin-bottom:6px}
.contact-form input,.contact-form textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;color:var(--ink);margin-bottom:16px;background:#f8fafc}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--brand);background:#fff}
.contact-form button{background:var(--brand);color:#fff;border:none;padding:12px 28px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer}
.contact-form button:hover{background:var(--brand-dk)}
/* product intro */
.prod-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1100px;margin:0 auto}
/* responsive */
@media(max-width:900px){
.hero h1{font-size:34px}.sec-head h2{font-size:26px}
.grid,.prod-list,.plans,.ent-feats,.dl-grid{grid-template-columns:1fr}
.about,.showcase{grid-template-columns:1fr;gap:28px}.showcase.reverse{direction:ltr}
.contact-grid{grid-template-columns:1fr}
.ft-main{grid-template-columns:1fr}.ft-links{grid-template-columns:repeat(2,1fr)}
.log-item{grid-template-columns:1fr}
.nav{display:none}
}