*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#1E6FFF;
  --primary-dark:#0B4FCC;
  --primary-light:#E8F1FF;
  --accent:#00C9A7;
  --accent-light:#E6FAF5;
  --bg:#F7F9FC;
  --white:#FFFFFF;
  --text:#1A2332;
  --text-secondary:#5A6577;
  --text-muted:#8E99A8;
  --border:#E2E8F0;
  --card-shadow:0 2px 12px rgba(30,111,255,0.08);
  --radius:12px;
}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}

/* Nav */
.nav{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--text);font-weight:700;font-size:18px}
.nav-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}
.nav-links{display:flex;gap:28px}
.nav-links a{text-decoration:none;color:var(--text-secondary);font-size:14px;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.nav-cta{background:var(--primary);color:#fff!important;padding:8px 20px;border-radius:8px;font-size:13px;font-weight:600;text-decoration:none;transition:background .2s}
.nav-cta:hover{background:var(--primary-dark)}

/* Hero */
.hero{background:linear-gradient(135deg,#EBF4FF 0%,#F0F7FF 50%,#E6FAF5 100%);padding:80px 24px 60px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(30,111,255,0.06) 0%,transparent 70%);border-radius:50%}
.hero-badge{display:inline-block;background:var(--primary-light);color:var(--primary);padding:6px 16px;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:20px}
.hero h1{font-size:42px;font-weight:800;color:var(--text);margin-bottom:16px;letter-spacing:-0.5px;line-height:1.2}
.hero h1 .highlight{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-desc{font-size:17px;color:var(--text-secondary);max-width:640px;margin:0 auto 36px;line-height:1.7}
.hero-badges{display:flex;gap:10px;justify-content:center;margin-bottom:24px;flex-wrap:wrap}
.hero-badges .badge{display:inline-block;background:var(--white);border:1px solid var(--border);padding:6px 14px;border-radius:20px;font-size:12px;font-weight:500;color:var(--text-secondary)}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:36px}
.btn-primary{background:var(--primary);color:#fff;padding:14px 36px;border-radius:10px;font-size:16px;font-weight:600;text-decoration:none;transition:all .2s;box-shadow:0 4px 16px rgba(30,111,255,0.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(30,111,255,0.35)}
.btn-secondary{background:var(--white);color:var(--primary);padding:14px 36px;border-radius:10px;font-size:16px;font-weight:600;text-decoration:none;border:2px solid var(--primary);transition:all .2s}
.btn-secondary:hover{background:var(--primary-light)}
.hero-stats{display:flex;justify-content:center;gap:48px;flex-wrap:wrap}
.hero-stats .stat{text-align:center}
.hero-stats .stat strong{display:block;font-size:24px;font-weight:800;color:var(--primary)}
.hero-stats .stat span{font-size:13px;color:var(--text-muted)}

/* Features */
.features{max-width:1200px;margin:0 auto;padding:60px 24px}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:28px;font-weight:700;margin-bottom:8px}
.section-title p{color:var(--text-secondary);font-size:15px}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:all .25s}
.feature-card:hover{border-color:var(--primary);box-shadow:var(--card-shadow);transform:translateY(-2px)}
.feature-icon{width:48px;height:48px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px;background:var(--primary-light);color:var(--primary)}
.feature-card h3{font-size:16px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-secondary);line-height:1.6}

/* Download Section */
.download{background:var(--white);border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:60px 24px}
.download-inner{max-width:1200px;margin:0 auto}
.download-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px}
.dl-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;transition:all .25s;cursor:pointer;text-decoration:none;color:inherit}
.dl-card:hover{border-color:var(--primary);box-shadow:var(--card-shadow)}
.dl-icon{font-size:36px;margin-bottom:12px}
.dl-card h4{font-size:15px;font-weight:600;margin-bottom:4px}
.dl-card p{font-size:13px;color:var(--text-muted)}
.dl-btn{display:inline-block;margin-top:12px;background:var(--primary);color:#fff;padding:8px 20px;border-radius:8px;font-size:13px;font-weight:600;text-decoration:none}

/* Articles */
.articles{max-width:1200px;margin:0 auto;padding:60px 24px}
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:32px}
.article-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .25s;text-decoration:none;color:inherit;display:block}
.article-card:hover{border-color:var(--primary);box-shadow:var(--card-shadow);transform:translateY(-2px)}
.article-thumb{height:160px;background:linear-gradient(135deg,var(--primary-light),var(--accent-light));display:flex;align-items:center;justify-content:center;font-size:48px}
.article-body{padding:20px}
.article-tag{display:inline-block;padding:3px 10px;border-radius:4px;font-size:11px;font-weight:600;margin-bottom:10px}
.tag-download{background:#E8F1FF;color:var(--primary)}
.tag-tutorial{background:#E6FAF5;color:#0D9488}
.tag-troubleshoot{background:#FFF3E0;color:#E65100}
.tag-compare{background:#F3E5F5;color:#7B1FA2}
.tag-keyword{background:var(--primary-light);color:var(--primary)}
.article-card h3{font-size:15px;font-weight:600;line-height:1.5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.article-card p{font-size:13px;color:var(--text-muted);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.article-meta{display:flex;gap:12px;margin-top:12px;font-size:12px;color:var(--text-muted)}

/* FAQ */
.faq{max-width:800px;margin:0 auto;padding:60px 24px}
.faq-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin-bottom:12px}
.faq-q{font-size:15px;font-weight:600;color:var(--text);display:flex;align-items:center;gap:8px}
.faq-q::before{content:'Q';background:var(--primary);color:#fff;width:24px;height:24px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}
.faq-a{font-size:14px;color:var(--text-secondary);margin-top:10px;padding-left:32px;line-height:1.7}

/* Article Page */
.breadcrumb{max-width:1200px;margin:0 auto;padding:16px 24px;font-size:13px;color:var(--text-muted)}
.breadcrumb a{color:var(--primary);text-decoration:none}
.breadcrumb span{margin:0 6px}
.article-header{max-width:800px;margin:0 auto;padding:0 24px 32px}
.article-tags{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}
.tag{display:inline-block;padding:4px 12px;border-radius:6px;font-size:12px;font-weight:600}
.article-title{font-size:32px;font-weight:800;line-height:1.3;margin-bottom:16px;letter-spacing:-0.3px}
.article-meta-row{display:flex;gap:16px;font-size:13px;color:var(--text-muted);align-items:center}
.article-meta-row .dot{width:4px;height:4px;border-radius:50%;background:var(--text-muted)}
.cpa-banner{max-width:800px;margin:0 auto 32px;padding:0 24px}
.cpa-banner-inner{background:linear-gradient(135deg,var(--primary),#3B82F6);border-radius:var(--radius);padding:20px 24px;display:flex;align-items:center;justify-content:space-between;color:#fff}
.cpa-banner-inner h4{font-size:15px;font-weight:600;margin-bottom:4px}
.cpa-banner-inner p{font-size:13px;opacity:0.85}
.cpa-btn{background:#fff;color:var(--primary);padding:10px 24px;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap;transition:transform .2s}
.cpa-btn:hover{transform:scale(1.03)}
.cover-area{max-width:800px;margin:0 auto 32px;padding:0 24px}
.cover-area img{width:100%;border-radius:var(--radius);display:block}

/* Layout */
.layout{max-width:1200px;margin:0 auto;padding:0 24px 60px;display:flex;gap:32px}
.main-col{flex:1;min-width:0}

/* TOC */
.toc-box{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin-bottom:24px}
.toc-box h4{font-size:14px;font-weight:600;margin-bottom:12px}
.toc-box #TableOfContents ul{list-style:none;padding:0}
.toc-box #TableOfContents li{margin-bottom:6px}
.toc-box #TableOfContents a{font-size:13px;color:var(--text-secondary);text-decoration:none;display:block;padding:4px 0 4px 12px;border-left:2px solid transparent;transition:all .2s}
.toc-box #TableOfContents a:hover{color:var(--primary);border-left-color:var(--primary)}

/* Article Body */
.article-body{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:32px 36px;font-size:15px;line-height:1.8;color:var(--text)}
.article-body h2{font-size:22px;font-weight:700;margin:32px 0 16px;padding-bottom:8px;border-bottom:2px solid var(--primary-light)}
.article-body h3{font-size:17px;font-weight:600;margin:24px 0 12px;color:var(--text)}
.article-body p{margin-bottom:16px}
.article-body ul,.article-body ol{margin-bottom:16px;padding-left:24px}
.article-body li{margin-bottom:6px}
.article-body strong{color:var(--primary-dark)}
.article-body a{color:var(--primary);text-decoration:none;border-bottom:1px solid var(--primary-light)}
.article-body a:hover{border-bottom-color:var(--primary)}
.article-body img{max-width:100%;height:auto;border-radius:8px;margin:16px 0;display:block}
.article-body blockquote{border-left:4px solid var(--primary);background:var(--primary-light);padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0;font-size:14px;color:var(--primary-dark)}
.article-body table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.article-body th{background:var(--primary);color:#fff;padding:10px 14px;text-align:left;font-weight:600}
.article-body td{padding:10px 14px;border-bottom:1px solid var(--border)}
.article-body tr:hover td{background:var(--primary-light)}
.compliance-notice{background:#FFF8E1;border:1px solid #FFE082;border-radius:8px;padding:14px 18px;margin-bottom:20px;font-size:13px;color:#F57C00;line-height:1.6}
.compliance-footer{background:#F1F5F9;border-radius:8px;padding:14px 18px;margin-top:32px;font-size:13px;color:var(--text-muted);line-height:1.6}
.inline-cta{background:linear-gradient(135deg,var(--accent-light),var(--primary-light));border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin:24px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}
.inline-cta h4{font-size:14px;font-weight:600;margin-bottom:4px;color:var(--text)}
.inline-cta p{font-size:13px;color:var(--text-secondary)}
.inline-cta .cta-btn{background:var(--primary);color:#fff;padding:8px 20px;border-radius:8px;font-size:13px;font-weight:600;text-decoration:none;white-space:nowrap}

/* Sidebar */
.sidebar{width:300px;flex-shrink:0}
.sidebar-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.sidebar-card h4{font-size:14px;font-weight:600;margin-bottom:14px;display:flex;align-items:center;gap:6px}
.tool-card{background:linear-gradient(135deg,var(--primary),#3B82F6);border:none;color:#fff}
.tool-card h4{color:#fff}
.tool-card p{font-size:13px;opacity:0.85;margin-bottom:14px;line-height:1.6}
.tool-btn{display:block;background:#fff;color:var(--primary);padding:10px;text-align:center;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;transition:transform .2s}
.tool-btn:hover{transform:scale(1.02)}
.related-item{display:flex;align-items:flex-start;gap:10px;margin-bottom:10px}
.ri-num{width:22px;height:22px;background:var(--primary-light);color:var(--primary);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0;margin-top:2px}
.related-item a{font-size:13px;color:var(--text-secondary);text-decoration:none;line-height:1.5;transition:color .2s}
.related-item a:hover{color:var(--primary)}

/* Recommend */
.recommend{max-width:1200px;margin:0 auto;padding:0 24px 60px}
.recommend-title{font-size:18px;font-weight:600;margin-bottom:16px;display:flex;align-items:center;gap:8px}
.recommend-title .dot{width:8px;height:8px;border-radius:50%;background:var(--primary)}
.recommend-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.recommend-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;text-decoration:none;color:inherit;transition:all .25s}
.recommend-card:hover{border-color:var(--primary);box-shadow:var(--card-shadow);transform:translateY(-2px)}
.rc-thumb{width:120px;min-width:120px;height:100px;overflow:hidden;flex-shrink:0;background:linear-gradient(135deg,var(--primary-light),var(--accent-light));display:flex;align-items:center;justify-content:center;font-size:32px}
.rc-body{padding:12px 14px;flex:1;min-width:0;display:flex;flex-direction:column;justify-content:center}
.rc-tag{display:inline-block;padding:2px 8px;border-radius:4px;font-size:10px;font-weight:600;margin-bottom:6px;background:var(--primary-light);color:var(--primary)}
.recommend-card h5{font-size:13px;font-weight:600;line-height:1.4;margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.recommend-card p{font-size:12px;color:var(--text-muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* Section List Page */
.section-header{max-width:800px;margin:0 auto;padding:32px 24px;text-align:center}
.section-header h1{font-size:28px;font-weight:700;margin-bottom:8px}
.section-header p{color:var(--text-secondary);font-size:15px}
.section-grid{max-width:1200px;margin:0 auto;padding:0 24px 60px}

/* Footer */
.footer{background:#1A2332;color:#fff;padding:48px 24px 24px}
.footer-inner{max-width:1200px;margin:0 auto}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .logo{display:flex;align-items:center;gap:8px;margin-bottom:12px;font-weight:700;font-size:18px}
.footer-brand .logo .icon{width:32px;height:32px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:16px}
.footer-brand p{font-size:13px;color:rgba(255,255,255,0.5);line-height:1.7;max-width:280px}
.footer-col h4{font-size:14px;font-weight:600;margin-bottom:16px;color:rgba(255,255,255,0.9)}
.footer-col a{display:block;color:rgba(255,255,255,0.5);text-decoration:none;font-size:13px;margin-bottom:10px;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-copy{font-size:12px;color:rgba(255,255,255,0.35)}
.footer-disclaimer{font-size:12px;color:rgba(255,255,255,0.3);background:rgba(255,255,255,0.05);padding:6px 12px;border-radius:6px}

/* Responsive */
@media(max-width:900px){
  .layout{flex-direction:column}
  .sidebar{width:100%;order:-1}
  .recommend-grid{grid-template-columns:1fr}
  .article-title{font-size:24px}
  .article-body{padding:24px 20px}
  .nav-links{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .hero h1{font-size:28px}
  .feature-grid{grid-template-columns:1fr}
  .download-grid{grid-template-columns:repeat(2,1fr)}
  .hero-stats{gap:24px}
  .article-grid{grid-template-columns:1fr}
  .cpa-banner-inner{flex-direction:column;gap:12px;text-align:center}
}