*,*::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;font-size:16px}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#67e8f9}
img{max-width:100%;display:block}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* Header */
.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;height:64px}
.logo{font-size:1.35rem;font-weight:700;color:var(--text);display:flex;align-items:center;gap:10px}
.logo span{color:var(--accent)}
.nav{display:flex;align-items:center;gap:28px}
.nav a{color:var(--text-muted);font-size:.95rem}
.nav a:hover,.nav a.active{color:var(--text)}
.btn-download{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;padding:10px 22px;border-radius:50px;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn-download:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(37,99,235,.4);color:#fff}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer}

/* Hero */
.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:rgba(37,99,235,.15);color:var(--accent);padding:6px 16px;border-radius:50px;font-size:.85rem;margin-bottom:20px;border:1px solid rgba(6,182,212,.3)}
.hero h1{font-size:2.6rem;font-weight:800;line-height:1.25;margin-bottom:18px;background:linear-gradient(135deg,#fff 60%,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:var(--text-muted);font-size:1.1rem;max-width:640px;margin:0 auto 32px}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-outline{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border-radius:50px;border:1px solid var(--border);color:var(--text);font-weight:500;transition:background .2s,border-color .2s}
.btn-outline:hover{background:var(--bg-card);border-color:var(--accent);color:var(--text)}

/* Sections */
section{padding:64px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2rem;font-weight:700;margin-bottom:10px}
.section-title p{color:var(--text-muted);max-width:560px;margin:0 auto}

/* Feature Grid */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,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:14px}
.feature-card h3{font-size:1.15rem;margin-bottom:10px}
.feature-card p{color:var(--text-muted);font-size:.93rem}

/* Tags */
.tag-row{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:32px}
.tag{background:rgba(37,99,235,.12);color:var(--accent);padding:8px 18px;border-radius:50px;font-size:.85rem;border:1px solid rgba(37,99,235,.25)}

/* Platform */
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:20px;max-width:700px;margin:0 auto}
.platform-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;transition:border-color .2s}
.platform-item:hover{border-color:var(--accent)}
.platform-item .icon{font-size:2.2rem;margin-bottom:8px}
.platform-item span{font-size:.9rem;color:var(--text-muted)}

/* Nodes */
.nodes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px}
.node-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-align:center}
.node-card h4{margin-bottom:4px;font-size:1rem}
.node-card p{color:var(--text-muted);font-size:.85rem}

/* Reviews */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.review-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.review-card blockquote{color:var(--text-muted);font-style:italic;margin-bottom:12px;font-size:.93rem}
.review-card cite{color:var(--accent);font-size:.85rem;font-style:normal}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden;background:var(--bg-card)}
.faq-q{width:100%;background:none;border:none;color:var(--text);padding:18px 22px;text-align:left;font-size:1rem;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.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:400px;padding:0 22px 18px}
.faq-a p{color:var(--text-muted);font-size:.93rem}

/* Articles */
.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);overflow:hidden;transition:transform .2s,border-color .2s}
.article-card:hover{transform:translateY(-4px);border-color:var(--primary)}
.article-card-body{padding:22px}
.article-card h3{font-size:1.05rem;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:.88rem;margin-bottom:12px}
.article-meta{display:flex;gap:16px;font-size:.8rem;color:var(--text-muted)}

/* Article Page */
.article-page{padding:48px 0 64px}
.article-page h1{font-size:2rem;margin-bottom:12px;line-height:1.35}
.article-page .meta{color:var(--text-muted);font-size:.88rem;margin-bottom:32px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.article-content h2{font-size:1.4rem;margin:32px 0 14px;color:var(--text)}
.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{color:var(--text-muted);margin:0 0 16px 24px}
.article-content li{margin-bottom:8px}
.article-content strong{color:var(--text)}

/* Download Page */
.download-hero{text-align:center;padding:60px 0 40px}
.download-hero h1{font-size:2.2rem;margin-bottom:14px}
.download-hero p{color:var(--text-muted);max-width:520px;margin:0 auto 36px}
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;max-width:900px;margin:0 auto}
.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:14px}
.download-card h3{margin-bottom:8px}
.download-card p{color:var(--text-muted);font-size:.88rem;margin-bottom:20px}
.download-steps{max-width:700px;margin:48px auto 0}
.download-steps h2{text-align:center;margin-bottom:28px;font-size:1.5rem}
.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}

/* Footer */
.site-footer{background:var(--bg-card);border-top:1px solid var(--border);padding:40px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer-col h4{margin-bottom:14px;font-size:.95rem}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:var(--text-muted);font-size:.88rem}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid var(--border);color:var(--text-muted);font-size:.82rem}

/* Auto update badge */
.update-badge{display:inline-block;background:rgba(34,197,94,.12);color:var(--success);padding:3px 10px;border-radius:4px;font-size:.78rem;margin-left:8px}

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

/* Responsive */
@media(max-width:768px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg-card);flex-direction:column;padding:20px;border-bottom:1px solid var(--border);gap:16px}
  .nav.open{display:flex}
  .menu-toggle{display:block}
  .hero h1{font-size:1.8rem}
  .hero{padding:48px 0 40px}
  section{padding:40px 0}
}