:root{
  --bg:#FFFFFF;
  --bg-soft:#F5F7FA;
  --border:#E4E9F0;
  --text:#1F2329;
  --text-secondary:#5E6673;
  --text-weak:#8A939E;
  --accent:#00BEBD;
  --accent-hover:#00A6A7;
  --accent-soft:rgba(0,190,189,.08);
  --radius:12px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
code{background:var(--bg-soft);border:1px solid var(--border);border-radius:6px;padding:2px 7px;font-size:.92em}

.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:1080px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700}
.brand img{width:32px;height:32px;border-radius:8px}
.nav-links{display:flex;gap:22px;font-size:14px;color:var(--text-secondary)}
.nav-links a:hover{color:var(--accent)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:10px;font-weight:600;font-size:14px;padding:11px 22px;transition:background .15s;font-family:inherit}
.btn-sm{padding:8px 16px;font-size:13px}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover)}
.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

.hero{background:linear-gradient(180deg,#F0FBFB 0%,#FFFFFF 70%);border-bottom:1px solid var(--border)}
.hero-inner{max-width:760px;margin:0 auto;padding:88px 24px 76px;text-align:center}
.hero-icon img{width:96px;height:96px;border-radius:22px;margin:0 auto 22px;box-shadow:0 12px 34px rgba(0,190,189,.22)}
.eyebrow{font-size:13px;font-weight:600;color:var(--accent);letter-spacing:.3px;margin-bottom:10px}
.hero h1{font-size:48px;line-height:1.15;letter-spacing:0;margin-bottom:14px}
.hero-sub{font-size:17px;color:var(--text-secondary);max-width:560px;margin:0 auto 28px}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-note{margin-top:16px;font-size:12px;color:var(--text-weak)}

.band{padding:72px 24px}
.band-alt{background:var(--bg-soft)}
.band-inner{max-width:1080px;margin:0 auto}
.band h2{font-size:30px;text-align:center;margin-bottom:12px;letter-spacing:0}
.section-sub{text-align:center;color:var(--text-secondary);margin-bottom:34px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.band-alt .feature{background:#fff}
.feature-mark{font-size:12px;font-weight:700;color:var(--accent);margin-bottom:10px}
.feature h3{font-size:16px;margin-bottom:8px}
.feature p{font-size:13px;color:var(--text-secondary)}

.steps{max-width:620px;margin:0 auto 40px;counter-reset:step}
.steps li{list-style:none;counter-increment:step;position:relative;padding:0 0 18px 44px;font-size:14px;color:var(--text-secondary)}
.steps li::before{content:counter(step);position:absolute;left:0;top:0;width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
.download-box{max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;display:flex;align-items:center;gap:18px;box-shadow:0 10px 30px rgba(31,35,41,.05)}
.download-box img{width:64px;height:64px;border-radius:14px;flex-shrink:0}
.download-box h3{font-size:17px;margin-bottom:4px}
.download-box p{font-size:13px;color:var(--text-secondary);flex:1}
.center-note{text-align:center;font-size:12px;color:var(--text-weak);margin-top:14px}

.price-grid{max-width:860px;margin:0 auto}
.price-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:30px 22px;text-align:center}
.price-card h3{font-size:16px;margin-bottom:16px}
.price{font-size:42px;font-weight:800;line-height:1}
.price span{font-size:20px;vertical-align:top;margin-right:2px}
.price-note{font-size:13px;color:var(--text-weak);margin-top:12px}
.price-card-hot{border-color:var(--accent);box-shadow:0 12px 34px rgba(0,190,189,.14)}
.price-card-hot::before{content:"推荐";display:inline-block;font-size:11px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:20px;padding:2px 10px;margin-bottom:10px}

.faq-list{max-width:720px;margin:0 auto}
.faq-list details{background:#fff;border:1px solid var(--border);border-radius:10px;padding:16px 18px;margin-bottom:10px}
.faq-list summary{cursor:pointer;font-weight:600;font-size:14px}
.faq-list p{margin-top:10px;font-size:13px;color:var(--text-secondary)}

.footer{border-top:1px solid var(--border);padding:36px 24px;background:var(--bg-soft)}
.footer-inner{max-width:1080px;margin:0 auto;text-align:center;font-size:12px;color:var(--text-weak)}
.footer-links{display:flex;gap:18px;justify-content:center;margin:12px 0}
.footer-links a:hover{color:var(--accent)}
.footer-copy{margin-top:6px}

@media (max-width:820px){
  .nav-links{display:none}
  .hero{padding-top:56px}
  .hero h1{font-size:36px}
  .grid-3{grid-template-columns:1fr}
  .download-box{flex-direction:column;text-align:center}
  .band{padding:52px 20px}
}