*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#4d6bfe;
  --primary-dark:#3a56d4;
  --bg:#f7f8fc;
  --surface:#fff;
  --text:#1a1a2e;
  --text-muted:#5c6370;
  --border:#e8ecf4;
  --radius:12px;
  --shadow:0 4px 24px rgba(77,107,254,.08);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif
}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);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:1100px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;backdrop-filter:blur(8px)}
.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),#6c8cff);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:800}
.nav{display:flex;gap:28px;list-style:none}
.nav a{color:var(--text-muted);font-size:15px;font-weight:500}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text)}

/* Hero */
.hero{padding:80px 0 60px;text-align:center;background:linear-gradient(180deg,#eef1ff 0%,var(--bg) 100%)}
.hero-badge{display:inline-block;background:rgba(77,107,254,.1);color:var(--primary);padding:6px 16px;border-radius:20px;font-size:14px;margin-bottom:20px}
.hero h1{font-size:42px;font-weight:800;line-height:1.3;margin-bottom:16px;letter-spacing:-.5px}
.hero p{font-size:18px;color:var(--text-muted);max-width:640px;margin:0 auto 32px}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;border-radius:var(--radius);font-size:16px;font-weight:600;cursor:pointer;border:none;transition:all .2s}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px rgba(77,107,254,.35)}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px)}
.btn-outline{background:var(--surface);color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:rgba(77,107,254,.06)}

/* Sections */
.section{padding:64px 0}
.section-title{font-size:28px;font-weight:700;text-align:center;margin-bottom:12px}
.section-desc{text-align:center;color:var(--text-muted);max-width:600px;margin:0 auto 40px}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.feature-card{background:var(--surface);border-radius:var(--radius);padding:32px;border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .2s}
.feature-card:hover{transform:translateY(-4px)}
.feature-icon{width:48px;height:48px;background:rgba(77,107,254,.1);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{color:var(--text-muted);font-size:15px}

/* Download cards */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.download-card{background:var(--surface);border-radius:var(--radius);padding:36px;text-align:center;border:1px solid var(--border);box-shadow:var(--shadow)}
.download-card .platform-icon{font-size:48px;margin-bottom:16px}
.download-card h3{font-size:20px;margin-bottom:8px}
.download-card p{color:var(--text-muted);font-size:14px;margin-bottom:20px}
.download-card .btn{width:100%;justify-content:center}

/* Articles */
.articles-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.article-card{background:var(--surface);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .2s}
.article-card:hover{transform:translateY(-3px)}
.article-card-body{padding:24px}
.article-card .tag{display:inline-block;background:rgba(77,107,254,.1);color:var(--primary);font-size:12px;padding:4px 10px;border-radius:6px;margin-bottom:10px}
.article-card h3{font-size:18px;margin-bottom:8px;line-height:1.4}
.article-card h3 a{color:var(--text)}
.article-card h3 a:hover{color:var(--primary)}
.article-card p{color:var(--text-muted);font-size:14px}
.article-card .date{font-size:13px;color:#999;margin-top:12px}

/* Article page */
.article-header{padding:48px 0 32px;text-align:center;background:linear-gradient(180deg,#eef1ff 0%,var(--bg) 100%)}
.article-header h1{font-size:32px;font-weight:800;margin-bottom:12px;max-width:800px;margin-left:auto;margin-right:auto}
.article-meta{color:var(--text-muted);font-size:14px}
.article-content{max-width:760px;margin:0 auto;padding:40px 24px 64px}
.article-content h2{font-size:22px;margin:32px 0 12px;padding-left:12px;border-left:4px solid var(--primary)}
.article-content h3{font-size:18px;margin:24px 0 10px}
.article-content p{margin-bottom:16px;color:#333}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:#333}
.article-content li{margin-bottom:6px}
.article-content blockquote{background:rgba(77,107,254,.06);border-left:4px solid var(--primary);padding:16px 20px;margin:20px 0;border-radius:0 var(--radius) var(--radius) 0;color:var(--text-muted)}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:14px;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb span{margin:0 8px}

/* Footer */
.site-footer{background:#1a1a2e;color:#a0a8b8;padding:48px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer-grid h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px}
.footer-grid a{color:#a0a8b8;font-size:14px}
.footer-grid a:hover{color:#fff}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid #2a2a40;font-size:13px}

/* Responsive */
@media(max-width:768px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--surface);flex-direction:column;padding:16px 24px;border-bottom:1px solid var(--border);gap:16px}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:28px}
  .hero{padding:48px 0 40px}
  .section{padding:40px 0}
}