*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a6eff;
  --primary-dark:#0d52cc;
  --accent:#00b4d8;
  --text:#1a1a2e;
  --text-light:#5a6270;
  --bg:#f5f8fc;
  --white:#ffffff;
  --border:#e2e8f0;
  --shadow:0 4px 24px rgba(26,110,255,.08);
  --radius:12px;
}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--white);box-shadow:0 1px 0 var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--text)}
.logo-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700}
.nav{display:flex;align-items:center;gap:28px}
.nav a{color:var(--text-light);font-size:15px;font-weight:500}
.nav a:hover,.nav a.active{color:var(--primary)}
.btn-download{display:inline-flex;align-items:center;gap:6px;background:var(--primary);color:#fff!important;padding:10px 22px;border-radius:8px;font-weight:600;font-size:14px;transition:background .2s,transform .15s}
.btn-download:hover{background:var(--primary-dark);transform:translateY(-1px)}
.mobile-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text)}

/* Hero */
.hero{background:linear-gradient(135deg,#e8f1ff 0%,#f0f7ff 50%,#e0f4ff 100%);padding:80px 0 60px;overflow:hidden;position:relative}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:400px;height:400px;background:radial-gradient(circle,rgba(26,110,255,.06) 0%,transparent 70%);border-radius:50%}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero h1{font-size:42px;line-height:1.25;margin-bottom:16px;font-weight:800;color:var(--text)}
.hero h1 span{color:var(--primary)}
.hero-desc{font-size:18px;color:var(--text-light);margin-bottom:28px;max-width:480px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--primary);color:#fff;padding:14px 32px;border-radius:10px;font-size:16px;font-weight:600;border:none;cursor:pointer;transition:all .2s}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-2px);box-shadow:0 8px 24px rgba(26,110,255,.25)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;background:var(--white);color:var(--primary);padding:14px 32px;border-radius:10px;font-size:16px;font-weight:600;border:2px solid var(--primary);cursor:pointer;transition:all .2s}
.btn-outline:hover{background:var(--primary);color:#fff}
.hero-stats{display:flex;gap:32px;margin-top:36px}
.stat-num{font-size:28px;font-weight:800;color:var(--primary)}
.stat-label{font-size:13px;color:var(--text-light)}
.hero-visual{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;border:1px solid var(--border)}
.translate-demo{background:var(--bg);border-radius:8px;padding:20px;margin-bottom:16px}
.demo-label{font-size:12px;color:var(--text-light);margin-bottom:8px;text-transform:uppercase;letter-spacing:1px}
.demo-text{font-size:15px;line-height:1.8}
.demo-arrow{text-align:center;color:var(--primary);font-size:20px;margin:8px 0}

/* Features */
.section{padding:72px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:32px;font-weight:800;margin-bottom:12px}
.section-title p{color:var(--text-light);font-size:17px;max-width:560px;margin:0 auto}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;border:1px solid var(--border);transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.feature-icon{width:52px;height:52px;background:linear-gradient(135deg,#e8f1ff,#d4e8ff);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.feature-card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.feature-card p{color:var(--text-light);font-size:14px;line-height:1.7}

/* Products */
.products{background:var(--white)}
.product-row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:64px}
.product-row:last-child{margin-bottom:0}
.product-row.reverse{direction:rtl}
.product-row.reverse>*{direction:ltr}
.product-info h3{font-size:26px;font-weight:800;margin-bottom:14px}
.product-info p{color:var(--text-light);margin-bottom:20px;font-size:15px}
.product-tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{background:#e8f1ff;color:var(--primary);padding:4px 12px;border-radius:20px;font-size:13px;font-weight:500}
.product-img{background:linear-gradient(135deg,#e8f1ff,#f0f7ff);border-radius:var(--radius);height:280px;display:flex;align-items:center;justify-content:center;font-size:64px}

/* Articles */
.articles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:var(--white);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:transform .2s,box-shadow .2s}
.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.article-thumb{height:160px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:40px}
.article-body{padding:20px}
.article-date{font-size:12px;color:var(--text-light);margin-bottom:8px}
.article-body h3{font-size:17px;font-weight:700;margin-bottom:10px;line-height:1.4}
.article-body h3 a{color:var(--text)}
.article-body h3 a:hover{color:var(--primary)}
.article-body p{color:var(--text-light);font-size:14px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.read-more{display:inline-block;margin-top:12px;font-size:14px;font-weight:600}

/* FAQ */
.faq{background:var(--white)}
.faq-list{max-width:760px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border);padding:20px 0}
.faq-item h3{font-size:16px;font-weight:700;margin-bottom:8px;cursor:pointer}
.faq-item p{color:var(--text-light);font-size:14px;line-height:1.7}

/* Download page */
.download-hero{text-align:center;padding:60px 0 40px}
.download-hero h1{font-size:36px;font-weight:800;margin-bottom:14px}
.download-hero p{color:var(--text-light);font-size:17px;max-width:600px;margin:0 auto 32px}
.download-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px}
.download-card{background:var(--white);border-radius:var(--radius);padding:36px 24px;text-align:center;border:1px solid var(--border);transition:transform .2s,box-shadow .2s}
.download-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.download-card .platform-icon{font-size:48px;margin-bottom:16px}
.download-card h3{font-size:18px;font-weight:700;margin-bottom:8px}
.download-card p{color:var(--text-light);font-size:13px;margin-bottom:20px}
.download-steps{background:var(--white);border-radius:var(--radius);padding:40px;border:1px solid var(--border);margin-bottom:48px}
.download-steps h2{font-size:24px;font-weight:800;margin-bottom:24px;text-align:center}
.steps-list{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step-item{text-align:center;counter-increment:step}
.step-item::before{content:counter(step);display:flex;width:40px;height:40px;background:var(--primary);color:#fff;border-radius:50%;align-items:center;justify-content:center;font-weight:700;margin:0 auto 12px;font-size:16px}
.step-item h4{font-size:15px;font-weight:700;margin-bottom:6px}
.step-item p{color:var(--text-light);font-size:13px}

/* Article page */
.article-page{padding:48px 0 72px}
.article-header{margin-bottom:32px;padding-bottom:24px;border-bottom:1px solid var(--border)}
.article-header h1{font-size:32px;font-weight:800;line-height:1.35;margin-bottom:12px}
.article-meta{display:flex;gap:20px;color:var(--text-light);font-size:14px}
.article-content{max-width:760px;margin:0 auto}
.article-content h2{font-size:22px;font-weight:700;margin:32px 0 14px;color:var(--text)}
.article-content h3{font-size:18px;font-weight:700;margin:24px 0 10px}
.article-content p{margin-bottom:16px;color:var(--text-light);line-height:1.8}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:var(--text-light)}
.article-content li{margin-bottom:8px}
.article-nav{margin-top:48px;padding-top:24px;border-top:1px solid var(--border);display:flex;justify-content:space-between}
.breadcrumb{font-size:14px;color:var(--text-light);margin-bottom:24px}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* Footer */
.site-footer{background:#1a1a2e;color:#a0aec0;padding:48px 0 24px;margin-top:48px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand .logo{color:#fff;margin-bottom:12px}
.footer-brand p{font-size:14px;line-height:1.7}
.footer-col h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:14px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:#a0aec0;font-size:14px}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #2d3748;padding-top:20px;text-align:center;font-size:13px}

/* Responsive */
@media(max-width:900px){
  .hero-grid,.product-row,.features-grid,.articles-grid,.download-cards,.steps-list,.footer-grid{grid-template-columns:1fr}
  .product-row.reverse{direction:ltr}
  .hero h1{font-size:30px}
  .nav{display:none}
  .nav.open{display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;background:var(--white);padding:20px;box-shadow:var(--shadow);gap:16px}
  .mobile-toggle{display:block}
}