*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#e03131;
  --primary-dark:#c62828;
  --primary-light:#ff5252;
  --text:#333;
  --text-light:#666;
  --bg:#f7f8fa;
  --white:#fff;
  --border:#e8e8e8;
  --shadow:0 2px 12px rgba(0,0,0,.08);
  --radius:8px;
  --max-w:1200px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",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:var(--max-w);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--white);box-shadow:0 1px 4px rgba(0,0,0,.06);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:22px;font-weight:700;color:var(--primary)}
.logo-icon{width:36px;height:36px;background:var(--primary);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--white);font-size:18px;font-weight:700}
.nav{display:flex;gap:28px;list-style:none}
.nav a{color:var(--text);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{background:linear-gradient(135deg,#fff 0%,#fff5f5 100%);padding:80px 0 60px;text-align:center}
.hero h1{font-size:42px;font-weight:800;color:var(--text);margin-bottom:16px;line-height:1.3}
.hero h1 span{color:var(--primary)}
.hero-desc{font-size:18px;color:var(--text-light);max-width:640px;margin:0 auto 32px}
.hero-btns{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:var(--white)}
.btn-primary:hover{background:var(--primary-dark);color:var(--white);transform:translateY(-1px);box-shadow:0 4px 16px rgba(224,49,49,.3)}
.btn-outline{background:var(--white);color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:var(--white)}

/* Features */
.section{padding:64px 0}
.section-title{text-align:center;font-size:32px;font-weight:700;margin-bottom:12px}
.section-desc{text-align:center;color:var(--text-light);margin-bottom:48px;font-size:16px}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:32px 24px;text-align:center;box-shadow:var(--shadow);transition:transform .2s}
.feature-card:hover{transform:translateY(-4px)}
.feature-icon{width:56px;height:56px;background:#fff0f0;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:28px}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{color:var(--text-light);font-size:14px}

/* Stats */
.stats{background:var(--primary);color:var(--white);padding:48px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-size:36px;font-weight:800;margin-bottom:4px}
.stat-label{font-size:14px;opacity:.85}

/* Content blocks */
.content-block{background:var(--white);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow);margin-bottom:24px}
.content-block h2{font-size:24px;margin-bottom:16px;color:var(--text)}
.content-block p{color:var(--text-light);margin-bottom:12px}
.content-block ul{padding-left:20px;color:var(--text-light)}
.content-block li{margin-bottom:8px}

/* Articles */
.articles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}
.article-card:hover{transform:translateY(-4px)}
.article-card-body{padding:24px}
.article-card h3{font-size:17px;margin-bottom:8px;line-height:1.5}
.article-card h3 a{color:var(--text)}
.article-card h3 a:hover{color:var(--primary)}
.article-card-meta{font-size:13px;color:#999;margin-bottom:10px}
.article-card p{font-size:14px;color:var(--text-light);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.article-tag{display:inline-block;background:#fff0f0;color:var(--primary);font-size:12px;padding:2px 10px;border-radius:12px;margin-bottom:8px}

/* Article page */
.article-header{padding:48px 0 32px;background:var(--white);border-bottom:1px solid var(--border)}
.article-header h1{font-size:32px;line-height:1.4;margin-bottom:12px}
.article-meta{color:#999;font-size:14px;margin-bottom:16px}
.article-body{max-width:800px;margin:0 auto;padding:40px 20px}
.article-body h2{font-size:22px;margin:32px 0 12px;color:var(--text)}
.article-body h3{font-size:18px;margin:24px 0 10px}
.article-body p{margin-bottom:16px;color:var(--text-light);line-height:1.8}
.article-body ul,.article-body ol{margin:12px 0 16px 24px;color:var(--text-light)}
.article-body li{margin-bottom:6px}

/* Download */
.download-hero{text-align:center;padding:60px 0 40px}
.download-hero h1{font-size:36px;margin-bottom:12px}
.download-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.download-card{background:var(--white);border-radius:var(--radius);padding:40px 24px;text-align:center;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{font-size:14px;color:var(--text-light);margin-bottom:20px}
.download-card .btn{width:100%;justify-content:center}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:20px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:20px;color:var(--primary);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .3s,color .3s;color:var(--text-light);font-size:15px}
.faq-item.open .faq-a{padding:0 24px 20px;max-height:300px}

/* Footer */
.site-footer{background:#2c2c2c;color:#aaa;padding:48px 0 24px;margin-top:64px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand .logo{color:var(--white);margin-bottom:12px}
.footer-brand p{font-size:14px;line-height:1.8}
.footer-col h4{color:var(--white);font-size:15px;margin-bottom:12px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:#aaa;font-size:14px}
.footer-col a:hover{color:var(--white)}
.footer-bottom{border-top:1px solid #444;padding-top:20px;text-align:center;font-size:13px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:14px;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* Daily update badge */
.update-badge{display:inline-block;background:#e8f5e9;color:#2e7d32;font-size:12px;padding:3px 10px;border-radius:12px;margin-left:8px}

@media(max-width:768px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--white);flex-direction:column;padding:16px 20px;box-shadow:var(--shadow);gap:12px}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:28px}
  .features-grid,.articles-grid,.download-cards,.stats-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section-title{font-size:24px}
}