*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#06b6d4;
  --bg:#0f172a;
  --bg-card:#1e293b;
  --text:#f1f5f9;
  --text-muted:#94a3b8;
  --border:#334155;
  --success:#22c55e;
  --radius:12px;
  --shadow:0 4px 24px rgba(0,0,0,.35);
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#67e8f9}
img{max-width:100%;height:auto}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

.site-header{position:sticky;top:0;z-index:100;background:rgba(15,23,42,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:16px;position:relative}
.logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:700;color:var(--text)}
.logo img{width:36px;height:36px;border-radius:8px}
.logo span{color:var(--accent)}
.main-nav{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.main-nav a{color:var(--text-muted);padding:8px 14px;border-radius:8px;font-size:.95rem}
.main-nav a:hover,.main-nav a.active{color:var(--text);background:var(--bg-card)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:10px;font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:transform .15s,box-shadow .15s}
.btn-primary,.btn-download{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 4px 16px rgba(37,99,235,.4)}
.btn-primary:hover,.btn-download:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(37,99,235,.5);color:#fff}
.btn-outline{background:transparent;border:2px solid var(--primary);color:var(--text);padding:10px 22px;border-radius:50px;font-weight:500}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-sm{padding:8px 18px;font-size:.9rem}
.btn-lg{padding:16px 36px;font-size:1.1rem}

.hero{padding:80px 0 60px;text-align:center;background:radial-gradient(ellipse at 50% 0%,rgba(37,99,235,.18) 0%,transparent 60%)}
.hero-badge{display:inline-block;background:var(--bg-card);border:1px solid var(--border);padding:6px 16px;border-radius:20px;font-size:.85rem;color:var(--accent);margin-bottom:20px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.2;margin-bottom:16px;background:linear-gradient(135deg,#fff,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1.15rem;color:var(--text-muted);max-width:640px;margin:0 auto 12px}
.hero-tags{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin:20px 0 32px}
.hero-tag{background:var(--bg-card);padding:6px 14px;border-radius:8px;font-size:.9rem;color:var(--text-muted);border:1px solid var(--border)}
.hero-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:40px}
.hero-trust{font-size:.9rem;color:var(--text-muted)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:40px 0}
.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}
.stat-num{font-size:2rem;font-weight:800;color:var(--accent)}
.stat-label{font-size:.85rem;color:var(--text-muted);margin-top:4px}

.section{padding:70px 0}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{font-size:2rem;font-weight:700;margin-bottom:12px}
.section-header p{color:var(--text-muted);max-width:560px;margin:0 auto}

.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px}
.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:transform .2s,border-color .2s}
.feature-card:hover{transform:translateY(-4px);border-color:var(--primary)}
.feature-icon{font-size:2rem;margin-bottom:12px}
.feature-card h3{font-size:1.15rem;margin-bottom:8px}
.feature-card p{color:var(--text-muted);font-size:.95rem}

.nodes-bar{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}
.nodes-list{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-top:16px}
.node-item{background:var(--bg);padding:10px 18px;border-radius:8px;font-size:.9rem;border:1px solid var(--border)}

.pricing-tabs{display:flex;justify-content:center;gap:12px;margin-bottom:32px;flex-wrap:wrap}
.pricing-tab{background:var(--bg-card);border:1px solid var(--border);padding:8px 20px;border-radius:20px;font-size:.9rem;color:var(--text-muted);cursor:pointer}
.pricing-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;max-width:800px;margin:0 auto}
.price-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;text-align:center}
.price-card.featured{border-color:var(--primary);box-shadow:0 0 30px rgba(37,99,235,.2)}
.price-card h3{font-size:1.2rem;margin-bottom:8px}
.price-amount{font-size:2.5rem;font-weight:800;color:var(--accent);margin:16px 0}
.price-amount span{font-size:1rem;color:var(--text-muted);font-weight:400}
.price-features{color:var(--text-muted);font-size:.9rem;margin-bottom:24px;line-height:2}
.price-note{text-align:center;color:var(--text-muted);font-size:.9rem;margin-top:24px}

.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.review-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.review-stars{color:#fbbf24;margin-bottom:8px}
.review-text{color:var(--text-muted);font-size:.95rem;margin-bottom:8px}
.review-author{font-size:.85rem;color:var(--text-muted);margin-top:12px}
.award-badge{display:inline-block;margin-top:32px;padding:12px 24px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);font-size:.95rem}

.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;user-select:none;width:100%;background:none;border:none;color:var(--text);text-align:left;font-size:1rem}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--accent);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s}
.faq-item.open .faq-a{max-height:600px;padding:0 24px 18px}
.faq-a p{color:var(--text-muted);font-size:.95rem;margin-bottom:8px}
.faq-step{font-weight:600;color:var(--text);margin-top:10px}

.download-hero{text-align:center;padding:60px 0 40px}
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin:40px 0}
.download-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;text-align:center;transition:border-color .2s}
.download-card:hover{border-color:var(--primary)}
.download-card .platform-icon{font-size:3rem;margin-bottom:12px}
.download-card h3{margin-bottom:8px}
.download-card p{color:var(--text-muted);font-size:.9rem;margin-bottom:20px}
.download-steps{max-width:700px;margin:40px auto;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.download-steps h2,.download-steps h3{margin-bottom:16px;text-align:center}
.download-steps ol{padding-left:20px;color:var(--text-muted)}
.download-steps li{margin-bottom:10px}
.step{display:flex;gap:16px;margin-bottom:20px;align-items:flex-start}
.step-num{flex-shrink:0;width:36px;height:36px;background:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.step-text h4{margin-bottom:4px;font-size:1rem}
.step-text p{color:var(--text-muted);font-size:.9rem}

.articles-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.article-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:border-color .2s,transform .2s}
.article-card:hover{border-color:var(--primary);transform:translateY(-4px)}
.article-card h3{margin-bottom:8px}
.article-card h3 a{color:var(--text)}
.article-card h3 a:hover{color:var(--accent)}
.article-card p{color:var(--text-muted);font-size:.9rem;margin-bottom:16px}
.article-meta{display:flex;gap:16px;font-size:.8rem;color:var(--text-muted);flex-wrap:wrap;align-items:center}
.update-badge{display:inline-block;background:rgba(34,197,94,.12);color:var(--success);padding:3px 10px;border-radius:4px;font-size:.78rem}

.page-header{padding:50px 0 30px;text-align:center;border-bottom:1px solid var(--border);margin-bottom:40px}
.page-header h1{font-size:2rem;margin-bottom:10px}
.page-meta{color:var(--text-muted);font-size:.9rem}
.article-content{max-width:760px;margin:0 auto 60px}
.article-content h2{font-size:1.4rem;margin:32px 0 12px;color:var(--accent)}
.article-content h3{font-size:1.15rem;margin:24px 0 10px}
.article-content p{color:var(--text-muted);margin-bottom:16px}
.article-content ul,.article-content ol{padding-left:24px;color:var(--text-muted);margin-bottom:16px}
.article-content li{margin-bottom:8px}
.article-content strong{color:var(--text)}

.breadcrumb{padding:16px 0;font-size:.85rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--accent)}

.sitemap-page{padding:48px 0 64px}
.sitemap-list{max-width:640px;margin:0 auto;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.sitemap-list h2{font-size:1.1rem;margin:24px 0 12px;color:var(--accent)}
.sitemap-list h2:first-child{margin-top:0}
.sitemap-list ul{list-style:none;padding:0}
.sitemap-list li{margin-bottom:10px}
.sitemap-list a{color:var(--text-muted);font-size:.95rem}
.sitemap-list a:hover{color:var(--accent)}

.site-footer{background:var(--bg-card);border-top:1px solid var(--border);padding:40px 0 24px;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer-col h4{margin-bottom:12px;font-size:1rem}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:var(--text-muted);font-size:.9rem}
.footer-col a:hover{color:var(--text)}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem}

.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer}
@media(max-width:768px){
  .menu-toggle{display:block}
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--border);flex-direction:column;padding:12px 20px}
  .main-nav.open{display:flex}
  .stats{grid-template-columns:repeat(2,1fr)}
  .hero{padding:50px 0 40px}
}