*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#1e40af;--primary-light:#3b82f6;--accent:#f59e0b;--accent-hover:#d97706;--bg:#f8fafc;--card:#fff;--text:#1e293b;--text2:#64748b;--border:#e2e8f0;--radius:12px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{text-decoration:none;color:var(--primary)}

/* Nav */
.nav{background:#fff;border-bottom:1px solid var(--border);padding:0 24px;display:flex;align-items:center;height:64px;position:sticky;top:0;z-index:100;gap:24px}
.nav-brand{font-size:20px;font-weight:800;color:var(--primary);letter-spacing:-0.5px;flex-shrink:0}
.nav-brand span{color:var(--accent)}
.nav-links{display:flex;gap:20px;font-size:15px;font-weight:500}
.nav-links a{color:var(--text2);transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.nav-search{flex:1;max-width:400px;margin-left:auto;position:relative}
.nav-search input{width:100%;padding:8px 16px 8px 40px;border:1.5px solid var(--border);border-radius:8px;font-size:14px;background:var(--bg);transition:border .2s}
.nav-search input:focus{border-color:var(--primary);outline:none}
.nav-search .search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text2)}

/* Hero */
.hero{background:linear-gradient(135deg,#1e3a8a 0%,#1e40af 50%,#1d4ed8 100%);color:#fff;padding:60px 24px 48px;text-align:center}
.hero h1{font-size:32px;font-weight:800;margin-bottom:12px}
.hero p{font-size:16px;opacity:.9;margin-bottom:32px}
.hero-search{max-width:560px;margin:0 auto 36px;position:relative}
.hero-search input{width:100%;padding:14px 20px 14px 48px;border:none;border-radius:12px;font-size:16px;box-shadow:0 4px 24px rgba(0,0,0,.15)}
.hero-search .search-icon{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--text2)}

.quick-entry{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:720px;margin:0 auto}
.quick-item{background:rgba(255,255,255,.15);backdrop-filter:blur(8px);border-radius:12px;padding:20px 12px;text-align:center;transition:all .25s;cursor:pointer}
.quick-item:hover{background:rgba(255,255,255,.25);transform:translateY(-2px)}
.quick-icon{font-size:28px;margin-bottom:8px}
.quick-label{font-size:14px;font-weight:600}

/* Download Banner */
.dl-banner{max-width:720px;margin:-24px auto 0;background:#fff;border-radius:var(--radius);padding:20px 24px;display:flex;align-items:center;gap:16px;box-shadow:0 2px 16px rgba(0,0,0,.08);position:relative;z-index:10}
.dl-banner-icon{width:48px;height:48px;background:var(--accent);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:24px;flex-shrink:0}
.dl-banner-text{flex:1}
.dl-banner-text h3{font-size:16px;font-weight:700}
.dl-banner-text p{font-size:13px;color:var(--text2)}
.dl-btn{background:var(--accent);color:#fff;border:none;padding:10px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;transition:all .2s;white-space:nowrap}
.dl-btn:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 4px 12px rgba(245,158,11,.4)}

/* Tab Section */
.tab-section{max-width:1120px;margin:40px auto;padding:0 24px}
.tab-header{display:flex;gap:0;border-bottom:2px solid var(--border);margin-bottom:24px}
.tab-btn{padding:12px 24px;font-size:15px;font-weight:600;color:var(--text2);border:none;background:none;cursor:pointer;position:relative;transition:color .2s}
.tab-btn.active{color:var(--primary)}
.tab-btn.active::after{content:'';position:absolute;bottom:-2px;left:0;right:0;height:2px;background:var(--primary)}
.tab-btn:hover{color:var(--primary)}
.tab-content{display:none}
.tab-content.active{display:block}

/* Article List */
.article-list{display:flex;flex-direction:column;gap:16px}
.article-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;display:flex;align-items:center;gap:16px;transition:all .2s}
.article-item:hover{border-color:var(--primary);box-shadow:0 2px 12px rgba(30,64,175,.08);transform:translateY(-1px)}
.article-badge{background:#eff6ff;color:var(--primary);font-size:12px;font-weight:700;padding:4px 10px;border-radius:6px;flex-shrink:0}
.article-info{flex:1}
.article-info h3{font-size:16px;font-weight:700;margin-bottom:4px}
.article-info h3 a{color:var(--text)}
.article-info h3 a:hover{color:var(--primary)}
.article-info p{font-size:13px;color:var(--text2)}
.article-arrow{color:var(--text2);font-size:18px}

/* Features */
.features{max-width:1120px;margin:48px auto;padding:0 24px}
.features h2{text-align:center;font-size:24px;font-weight:800;margin-bottom:32px;color:var(--primary)}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;transition:all .2s}
.feature-card:hover{border-color:var(--primary);box-shadow:0 4px 16px rgba(30,64,175,.08)}
.feature-icon{font-size:32px;margin-bottom:12px}
.feature-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.feature-card p{font-size:13px;color:var(--text2)}

/* Article Page */
.breadcrumb{max-width:1120px;margin:20px auto 0;padding:0 24px;font-size:13px;color:var(--text2)}
.breadcrumb a{color:var(--primary);font-weight:500}
.breadcrumb span{margin:0 6px}

.article-wrap{max-width:1120px;margin:24px auto;padding:0 24px;display:grid;grid-template-columns:1fr 320px;gap:32px;align-items:start}
.article-main{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 40px}
.article-meta{display:flex;align-items:center;gap:16px;margin-bottom:16px;font-size:13px;color:var(--text2)}
.article-meta .tag{background:#eff6ff;color:var(--primary);font-size:12px;font-weight:700;padding:4px 10px;border-radius:6px}
.article-main h1{font-size:26px;font-weight:800;color:var(--text);line-height:1.4;margin-bottom:20px}

.title-cta{background:linear-gradient(135deg,#fffbeb 0%,#fef3c7 100%);border:1.5px solid #fbbf24;border-radius:10px;padding:16px 20px;display:flex;align-items:center;gap:14px;margin-bottom:28px}
.title-cta-icon{font-size:28px;flex-shrink:0}
.title-cta-text{flex:1}
.title-cta-text strong{font-size:15px;color:var(--text)}
.title-cta-text p{font-size:12px;color:var(--text2);margin-top:2px}

.toc{background:#f1f5f9;border-radius:10px;padding:20px 24px;margin-bottom:28px}
.toc h3{font-size:14px;font-weight:700;margin-bottom:12px;color:var(--primary)}
.toc ul{list-style:none;counter-reset:toc}
.toc li{counter-increment:toc;margin-bottom:8px}
.toc li::before{content:counter(toc) ".";color:var(--primary);font-weight:700;margin-right:8px;font-size:13px}
.toc a{font-size:14px;color:var(--text);font-weight:500;transition:color .2s}
.toc a:hover{color:var(--primary)}

.article-body h2{font-size:20px;font-weight:700;color:var(--text);margin:32px 0 16px;padding-bottom:8px;border-bottom:2px solid #e2e8f0;position:relative}
.article-body h2::before{content:'';position:absolute;bottom:-2px;left:0;width:48px;height:2px;background:var(--primary)}
.article-body h3{font-size:16px;font-weight:700;color:var(--text);margin:24px 0 12px}
.article-body p{font-size:15px;color:var(--text);margin-bottom:16px}
.article-body ul,.article-body ol{margin:0 0 16px 24px;font-size:15px}
.article-body li{margin-bottom:8px}
.article-body blockquote{border-left:4px solid var(--primary);background:#f8fafc;padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0;font-size:14px;color:var(--text2)}
.article-body img{max-width:100%;height:auto;border-radius:8px;margin:16px 0;display:block}
.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:#f8fafc}

.mid-cta{background:linear-gradient(135deg,#1e3a8a 0%,#1e40af 100%);color:#fff;border-radius:10px;padding:24px;margin:28px 0;display:flex;align-items:center;gap:16px}
.mid-cta-icon{font-size:32px;flex-shrink:0}
.mid-cta-text{flex:1}
.mid-cta-text strong{font-size:16px;display:block;margin-bottom:4px}
.mid-cta-text p{font-size:13px;opacity:.9}
.mid-cta .dl-btn{background:#fff;color:var(--primary)}
.mid-cta .dl-btn:hover{background:#f1f5f9;box-shadow:0 4px 12px rgba(255,255,255,.3)}

.faq-section{margin-top:36px;border-top:2px solid var(--border);padding-top:28px}
.faq-item{border:1px solid var(--border);border-radius:8px;margin-bottom:10px;overflow:hidden}
.faq-q{padding:14px 18px;font-weight:600;font-size:14px;cursor:pointer;display:flex;align-items:center;gap:10px;background:#f8fafc;transition:background .2s}
.faq-q:hover{background:#f1f5f9}
.faq-q::before{content:'Q';background:var(--primary);color:#fff;width:22px;height:22px;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}
.faq-a{padding:14px 18px;font-size:14px;color:var(--text2);display:none;border-top:1px solid var(--border)}
.faq-item.open .faq-a{display:block}

.recommend{margin-top:36px;border-top:2px solid var(--border);padding-top:28px}
.recommend-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.recommend-card{border:1px solid var(--border);border-radius:10px;padding:16px;transition:all .2s}
.recommend-card:hover{border-color:var(--primary);box-shadow:0 2px 12px rgba(30,64,175,.08)}
.recommend-badge{background:#eff6ff;color:var(--primary);font-size:11px;font-weight:700;padding:3px 8px;border-radius:4px;display:inline-block;margin-bottom:8px}
.recommend-card h4{font-size:14px;font-weight:700;margin-bottom:4px;line-height:1.4}
.recommend-card h4 a{color:var(--text)}
.recommend-card h4 a:hover{color:var(--primary)}
.recommend-card p{font-size:12px;color:var(--text2);line-height:1.5}

/* Sidebar */
.sidebar{position:sticky;top:80px}
.sidebar-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.dl-card{background:linear-gradient(135deg,#1e3a8a 0%,#1e40af 100%);color:#fff;border:none;text-align:center}
.dl-card h3{font-size:18px;font-weight:800;margin-bottom:4px}
.dl-card p{font-size:12px;opacity:.85;margin-bottom:16px}
.dl-big-btn{background:var(--accent);color:#fff;border:none;padding:12px 32px;border-radius:8px;font-size:16px;font-weight:800;cursor:pointer;transition:all .2s;width:100%;margin-bottom:12px}
.dl-big-btn:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 4px 16px rgba(245,158,11,.5)}
.dl-note{font-size:11px;opacity:.7}
.related-list{list-style:none}
.related-list li{margin-bottom:10px}
.related-list a{font-size:13px;color:var(--text);font-weight:500;display:flex;align-items:center;gap:8px;transition:color .2s}
.related-list a:hover{color:var(--primary)}
.related-list a::before{content:'→';color:var(--primary);font-weight:700;font-size:12px}

/* Section list page */
.section-wrap{max-width:1120px;margin:24px auto;padding:0 24px}
.section-header{background:linear-gradient(135deg,#1e3a8a 0%,#1e40af 100%);color:#fff;border-radius:var(--radius);padding:32px 36px;margin-bottom:24px}
.section-header h1{font-size:24px;font-weight:800;margin-bottom:8px}
.section-header p{font-size:14px;opacity:.9}

/* Footer */
.footer{background:#1e293b;color:#94a3b8;padding:48px 24px 24px;margin-top:48px}
.footer-inner{max-width:1120px;margin:0 auto}
.footer-cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand{font-size:20px;font-weight:800;color:#fff;margin-bottom:8px}
.footer-brand span{color:var(--accent)}
.footer-desc{font-size:13px;line-height:1.7}
.footer h4{color:#fff;font-size:14px;font-weight:700;margin-bottom:12px}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer li a{font-size:13px;color:#94a3b8;transition:color .2s}
.footer li a:hover{color:#fff}
.footer-bottom{border-top:1px solid #334155;padding-top:16px;font-size:12px;text-align:center}

@media(max-width:768px){
  .quick-entry{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr 1fr}
  .dl-banner{flex-direction:column;text-align:center}
  .tab-header{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .hero h1{font-size:24px}
  .article-wrap{grid-template-columns:1fr}
  .sidebar{position:static;order:-1}
  .article-main{padding:24px 20px}
  .recommend-grid{grid-template-columns:1fr}
  .title-cta{flex-direction:column;text-align:center}
  .mid-cta{flex-direction:column;text-align:center}
  .nav-links{display:none}
}