*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:#fff;color:#1d1d1f;line-height:1.6;-webkit-font-smoothing:antialiased}
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(0,0,0,.08)}
.nav-in{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 24px}
.nav-logo{font-size:19px;font-weight:600;text-decoration:none;color:#1d1d1f;letter-spacing:.5px}
.nav-links a{font-size:14px;color:#1d1d1f;text-decoration:none;margin-left:26px;opacity:.75;transition:opacity .2s}
.nav-links a:hover{opacity:1}
.hero{background:linear-gradient(180deg,#fbfbfd 0%,#f5f5f7 100%);text-align:center;padding:150px 24px 90px}
.hero h1{font-size:56px;font-weight:700;letter-spacing:-1px;line-height:1.1}
.hero .grad{background:linear-gradient(90deg,#0071e3,#5e5ce6,#ff375f);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:22px;color:#6e6e73;margin:18px auto 34px;max-width:640px}
.cta{display:inline-block;background:#0071e3;color:#fff;font-size:17px;padding:13px 34px;border-radius:980px;text-decoration:none;transition:background .2s}
.cta:hover{background:#0077ed}
.cta.ghost{background:transparent;color:#0071e3;border:1px solid #0071e3;margin-left:12px}
section{max-width:1080px;margin:0 auto;padding:80px 24px}
.section-title{font-size:38px;font-weight:700;text-align:center;letter-spacing:-.5px;margin-bottom:10px}
.section-sub{text-align:center;color:#6e6e73;font-size:18px;margin-bottom:50px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px}
.card{background:#fff;border-radius:22px;padding:34px 26px;box-shadow:0 8px 30px rgba(0,0,0,.06);border:1px solid rgba(0,0,0,.04);text-align:center;transition:transform .25s,box-shadow .25s;text-decoration:none;color:#1d1d1f;display:block}
.card:hover{transform:translateY(-6px);box-shadow:0 18px 44px rgba(0,0,0,.12)}
.card .icon{font-size:52px;margin-bottom:16px}
.card h3{font-size:22px;font-weight:600;margin-bottom:8px}
.card p{font-size:14px;color:#6e6e73;min-height:44px}
.card .ver{font-size:13px;color:#0071e3;margin-top:14px}
.features{background:#f5f5f7;border-radius:26px;padding:48px;margin-top:50px}
.features h2{font-size:26px;font-weight:700;margin-bottom:22px;text-align:center}
.features ul{list-style:none;max-width:720px;margin:0 auto}
.features li{font-size:16px;padding:9px 0 9px 30px;position:relative;color:#3a3a3c}
.features li::before{content:"✓";position:absolute;left:0;color:#28a745;font-weight:700}
.dl{text-align:center;margin-top:46px}
.dl .tip{font-size:13px;color:#86868b;margin-top:14px}
.pad{padding-top:84px}
footer{background:#f5f5f7;text-align:center;padding:36px 24px;color:#86868b;font-size:13px}
@media(max-width:720px){.hero h1{font-size:38px}.hero p{font-size:18px}.nav-links a{margin-left:14px;font-size:13px}}