/* Kuailian static site styles */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,sans-serif;color:#2c3e50;background:#fff;line-height:1.6;-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}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid #eef1f5}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:700;color:#2c3e50}
.brand img{width:36px;height:36px}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{color:#4a5568;font-size:15px;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:#22c1a4}
.nav-actions{display:flex;align-items:center;gap:16px}
.lang{font-size:14px;color:#4a5568;border:1px solid #e2e8f0;border-radius:20px;padding:6px 14px}
.lang:hover{border-color:#22c1a4;color:#22c1a4}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:24px;font-weight:600;font-size:15px;transition:transform .2s,box-shadow .2s;border:none;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,#22c1a4 0%,#3ba0e6 100%);color:#fff;box-shadow:0 4px 14px rgba(34,193,164,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(34,193,164,.45)}
.btn-large{padding:16px 40px;font-size:17px;border-radius:32px}
.btn-outline{background:#fff;color:#22c1a4;border:2px solid #22c1a4}
.btn-outline:hover{background:#22c1a4;color:#fff}

/* Hero */
.hero{padding:80px 0 100px;background:linear-gradient(180deg,#f7fbfa 0%,#fff 100%);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero h1{font-size:44px;line-height:1.25;background:linear-gradient(135deg,#22c1a4,#3ba0e6);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:24px;font-weight:700}
.hero p.lead{font-size:17px;color:#5a6b7c;margin-bottom:36px;max-width:520px}
.hero-image{position:relative}
.hero-image img{width:100%;filter:drop-shadow(0 30px 60px rgba(34,193,164,.15))}

/* Section */
.section{padding:90px 0}
.section-alt{background:#f7fbfa}
.section-title{text-align:center;font-size:34px;font-weight:700;margin-bottom:16px;color:#1a2b3c}
.section-sub{text-align:center;color:#6b7c8f;font-size:16px;margin-bottom:56px;max-width:640px;margin-left:auto;margin-right:auto}

/* Cards grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.card{background:#fff;border:1px solid #eef1f5;border-radius:18px;padding:36px 28px;transition:transform .3s,box-shadow .3s;text-align:center}
.card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(34,193,164,.12);border-color:#c7ecdf}
.card .icon{width:64px;height:64px;margin:0 auto 20px;border-radius:50%;background:linear-gradient(135deg,#e6faf5,#e3f2fd);display:flex;align-items:center;justify-content:center;font-size:30px}
.card h3{font-size:20px;font-weight:600;margin-bottom:12px;color:#1a2b3c}
.card p{color:#6b7c8f;font-size:15px}

/* Testimonials */
.t-card{background:#fff;border-radius:18px;padding:32px;box-shadow:0 4px 20px rgba(0,0,0,.04);border:1px solid #eef1f5}
.t-card p{color:#4a5568;font-style:italic;margin-bottom:24px;font-size:15px}
.t-user{display:flex;align-items:center;gap:14px}
.t-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#22c1a4,#3ba0e6);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:18px}
.t-user strong{display:block;color:#1a2b3c;font-size:15px}
.t-user span{color:#8a9aad;font-size:13px}

/* Pricing */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.plan{background:#fff;border-radius:20px;border:1px solid #eef1f5;padding:40px 32px;position:relative;transition:transform .3s,box-shadow .3s}
.plan:hover{transform:translateY(-6px);box-shadow:0 24px 48px rgba(0,0,0,.08)}
.plan.featured{border:2px solid #22c1a4;box-shadow:0 20px 40px rgba(34,193,164,.15)}
.plan.featured::before{content:"推荐";position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,#22c1a4,#3ba0e6);color:#fff;padding:5px 16px;border-radius:14px;font-size:12px;font-weight:600}
.plan.featured[data-en]::before{content:"Recommended"}
.plan h3{font-size:22px;margin-bottom:8px;color:#1a2b3c}
.plan .price{font-size:40px;font-weight:700;color:#22c1a4;margin:16px 0 8px}
.plan .price small{font-size:16px;color:#8a9aad;font-weight:500}
.plan ul{list-style:none;margin:28px 0;text-align:left}
.plan ul li{padding:8px 0;color:#4a5568;font-size:15px;padding-left:26px;position:relative}
.plan ul li::before{content:"✓";position:absolute;left:0;color:#22c1a4;font-weight:700}
.plan .btn{width:100%}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid #eef1f5;border-radius:14px;margin-bottom:14px;overflow:hidden;transition:box-shadow .2s}
.faq details[open]{box-shadow:0 8px 24px rgba(0,0,0,.06)}
.faq summary{padding:20px 24px;cursor:pointer;font-weight:600;color:#1a2b3c;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:24px;color:#22c1a4;transition:transform .2s;font-weight:400}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:0 24px 20px;color:#5a6b7c;font-size:15px;line-height:1.8}

/* Page hero (interior) */
.page-hero{padding:70px 0 50px;background:linear-gradient(180deg,#f7fbfa 0%,#fff 100%);text-align:center}
.page-hero h1{font-size:38px;background:linear-gradient(135deg,#22c1a4,#3ba0e6);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:14px}
.page-hero p{color:#6b7c8f;font-size:17px;max-width:640px;margin:0 auto}

/* Download page */
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px;margin-top:40px}
.dl-card{background:#fff;border:1px solid #eef1f5;border-radius:18px;padding:36px;text-align:center;transition:transform .3s,box-shadow .3s}
.dl-card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(34,193,164,.12)}
.dl-card .os{font-size:52px;margin-bottom:16px}
.dl-card h3{font-size:22px;margin-bottom:8px;color:#1a2b3c}
.dl-card p{color:#6b7c8f;margin-bottom:22px;font-size:14px}

/* Help */
.help-cats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.help-cats a{background:#fff;border:1px solid #eef1f5;border-radius:14px;padding:24px;text-align:center;transition:all .2s;color:#2c3e50}
.help-cats a:hover{border-color:#22c1a4;transform:translateY(-4px);box-shadow:0 12px 24px rgba(34,193,164,.1)}
.help-cats .ico{font-size:32px;margin-bottom:10px}

/* About */
.about-content{max-width:820px;margin:0 auto;color:#4a5568;font-size:16px;line-height:1.9}
.about-content h2{font-size:24px;color:#1a2b3c;margin:36px 0 16px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:48px 0}
.stat{text-align:center;padding:28px 16px;background:#fff;border:1px solid #eef1f5;border-radius:16px}
.stat .num{font-size:36px;font-weight:700;background:linear-gradient(135deg,#22c1a4,#3ba0e6);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{color:#6b7c8f;font-size:14px;margin-top:6px}

/* Footer */
.site-footer{background:#0f1c2e;color:#a0aec0;padding:60px 0 30px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:20px;font-weight:700;margin-bottom:14px}
.footer-brand img{width:32px;height:32px}
.footer-col p{font-size:14px;line-height:1.7}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:14px;transition:color .2s}
.footer-col ul a:hover{color:#22c1a4}
.footer-bottom{border-top:1px solid #1e2d42;padding-top:24px;text-align:center;font-size:13px;color:#6b7c8f}

/* CTA band */
.cta{background:linear-gradient(135deg,#22c1a4,#3ba0e6);color:#fff;text-align:center;padding:70px 24px}
.cta h2{font-size:32px;margin-bottom:14px}
.cta p{margin-bottom:28px;opacity:.9;font-size:16px}
.cta .btn-primary{background:#fff;color:#22c1a4;box-shadow:0 8px 24px rgba(0,0,0,.15)}
.cta .btn-primary:hover{background:#f7fbfa}

/* Responsive */
@media (max-width:900px){
  .hero-grid,.grid-3,.grid-2,.pricing,.dl-grid,.help-cats,.stats,.footer-grid{grid-template-columns:1fr}
  .hero{padding:50px 0 60px}
  .hero h1{font-size:32px}
  .section{padding:60px 0}
  .section-title{font-size:26px}
  .nav-links{display:none}
  .stats{grid-template-columns:repeat(2,1fr)}
}