/* 17.c 全站样式 - 深色科技风 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--primary:#00e5ff;
--primary-dark:#00b8d4;
--accent:#7c4dff;
--bg-dark:#0a0e1a;
--bg-card:#111827;
--bg-alt:#0f1629;
--text:#e8eaed;
--text-muted:#9ca3af;
--border:#1e293b;
--radius:12px;
--shadow:0 4px 24px rgba(0,229,255,.08);
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg-dark);color:var(--text);line-height:1.8;overflow-x:hidden}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block;border-radius:var(--radius)}

/* Header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(10,14,26,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:12px 0}
.site-header .container{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px}
.logo img{width:42px;height:42px;border-radius:50%}
.logo-text{font-size:1.5rem;font-weight:700;color:var(--primary)}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer}
#mainNav{display:flex;gap:24px}
#mainNav a{color:var(--text-muted);font-size:.9rem;transition:color .2s}
#mainNav a:hover{color:var(--primary)}

/* Breadcrumb */
.breadcrumb{margin-top:70px;padding:12px 0;font-size:.85rem;color:var(--text-muted);border-bottom:1px solid var(--border)}
.breadcrumb a{color:var(--primary)}

/* Sections */
.section{padding:80px 0}
.section-alt{background:var(--bg-alt)}
.section h2{text-align:center;font-size:2rem;color:var(--primary);margin-bottom:12px}
.section-desc{text-align:center;color:var(--text-muted);max-width:700px;margin:0 auto 48px}

/* Hero */
.hero-section{padding:120px 0 80px;text-align:center;background:linear-gradient(180deg,var(--bg-alt) 0%,var(--bg-dark) 100%)}
.hero-badge{display:inline-block;background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.3);color:var(--primary);padding:6px 18px;border-radius:20px;font-size:.85rem;margin-bottom:24px}
.hero-section h1{font-size:2.4rem;line-height:1.4;margin-bottom:20px;color:#fff}
.hero-desc{font-size:1.1rem;color:var(--text-muted);max-width:800px;margin:0 auto 36px;line-height:1.9}
.hero-stats{display:flex;justify-content:center;gap:40px;margin-bottom:24px;flex-wrap:wrap}
.stat-item{text-align:center}
.stat-item strong{display:block;font-size:1.6rem;color:var(--primary)}
.stat-item span{font-size:.8rem;color:var(--text-muted)}
.hero-trust{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-bottom:32px;font-size:.85rem;color:var(--text-muted)}
.hero-cta{display:flex;justify-content:center;gap:16px;margin-bottom:24px;flex-wrap:wrap}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;padding:14px 36px;border-radius:8px;font-weight:600;font-size:1rem;transition:transform .2s,box-shadow .2s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,229,255,.3);color:#fff}
.btn-secondary{border:1px solid var(--primary);color:var(--primary);padding:14px 36px;border-radius:8px;font-weight:600;font-size:1rem;transition:background .2s}
.btn-secondary:hover{background:rgba(0,229,255,.1)}
.hero-date{font-size:.8rem;color:var(--text-muted)}

/* Grid layouts */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:24px}

/* Cards */
.card,.feature-card,.step-card,.scenario-card,.ai-card,.comm-card,.content-card,.review-card,.team-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:transform .2s,box-shadow .2s}
.card:hover,.feature-card:hover,.step-card:hover,.scenario-card:hover,.ai-card:hover,.comm-card:hover,.content-card:hover,.review-card:hover,.team-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card-num{font-size:2.5rem;font-weight:700;color:var(--primary);opacity:.6;margin-bottom:12px}
.card h3,.feature-card h3,.step-card h3,.scenario-card h3,.ai-card h3,.comm-card h4,.content-card h3,.team-card h3{color:#fff;margin:12px 0 8px;font-size:1.1rem}
.card p,.feature-card p,.step-card p,.scenario-card p,.ai-card p,.comm-card p,.content-card p,.review-card p,.team-card p{color:var(--text-muted);font-size:.9rem;line-height:1.7}
.feature-card img{margin-bottom:16px;border-radius:8px}

/* Rank */
.rank-list{display:flex;flex-direction:column;gap:16px}
.rank-item{display:flex;align-items:center;gap:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:transform .2s}
.rank-item:hover{transform:translateX(4px)}
.rank-gold{border-color:rgba(0,229,255,.4);background:linear-gradient(135deg,rgba(0,229,255,.05),rgba(124,77,255,.05))}
.rank-badge{min-width:60px;text-align:center;font-size:2rem;font-weight:700;color:var(--primary)}
.rank-badge span{display:block;font-size:.7rem;color:var(--text-muted)}
.rank-content{flex:1}
.rank-content h3{color:#fff;font-size:1.1rem;margin-bottom:8px}
.rank-tags{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.rank-tags span{background:rgba(0,229,255,.1);color:var(--primary);padding:2px 10px;border-radius:4px;font-size:.75rem}
.rank-content p{color:var(--text-muted);font-size:.85rem}
.rank-score{font-size:2rem;font-weight:700;color:var(--primary);min-width:80px;text-align:center}
.rank-score span{font-size:.9rem;color:var(--text-muted)}

/* Steps */
.step-num{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:50%;font-size:1.2rem;font-weight:700;margin-bottom:16px}

/* Scenario */
.scenario-card h3{color:var(--primary);font-size:.9rem;margin-bottom:4px}
.scenario-card h4{color:#fff;font-size:1.1rem;margin-bottom:8px}

/* Content cards */
.content-card img{margin-bottom:12px}
.content-meta{display:flex;gap:12px;margin-bottom:8px;font-size:.8rem;color:var(--text-muted)}
.content-meta span{background:rgba(0,229,255,.1);padding:2px 8px;border-radius:4px}

/* AI cards */
.ai-icon{font-size:2.5rem;margin-bottom:12px}

/* Community */
.comm-card{text-align:center}

/* Article */
.deep-article{max-width:900px;margin:0 auto}
.deep-article h2{text-align:left;margin-bottom:16px}
.article-meta{color:var(--text-muted);font-size:.9rem;margin-bottom:24px}
.article-toc{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:32px}
.article-toc h4{color:var(--primary);margin-bottom:12px;font-size:.9rem}
.article-toc a{display:block;color:var(--text-muted);padding:4px 0;font-size:.9rem}
.article-toc a:hover{color:var(--primary)}
.deep-article h3{color:#fff;font-size:1.3rem;margin:32px 0 16px}
.deep-article p{color:var(--text-muted);margin-bottom:16px;line-height:1.9}
.deep-article blockquote{border-left:3px solid var(--primary);padding:16px 20px;background:rgba(0,229,255,.05);border-radius:0 8px 8px 0;margin:24px 0;font-style:italic;color:var(--text)}
.deep-article figure{margin:24px 0}
.deep-article figcaption{text-align:center;font-size:.8rem;color:var(--text-muted);margin-top:8px}

/* Team */
.team-card{text-align:center}
.team-card img{width:120px;height:120px;border-radius:50%;margin:0 auto 16px;object-fit:cover}
.team-title{color:var(--primary);font-size:.85rem;margin-bottom:8px}

/* Metrics */
.metrics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.metric{text-align:center;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.metric strong{display:block;font-size:2rem;color:var(--primary);margin-bottom:8px}
.metric span{color:var(--text-muted);font-size:.9rem}

/* Reviews */
.review-card{border-left:3px solid var(--primary)}
.review-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.review-header strong{color:#fff}
.review-header span{color:var(--text-muted);font-size:.8rem}
.review-stars{color:#ffd700;margin-bottom:8px}

/* Compare */
.compare-table{display:flex;align-items:stretch;gap:0;max-width:900px;margin:0 auto}
.compare-col{flex:1;padding:32px;border-radius:var(--radius)}
.compare-old{background:rgba(239,68,68,.05);border:1px solid rgba(239,68,68,.2)}
.compare-new{background:rgba(0,229,255,.05);border:1px solid rgba(0,229,255,.2)}
.compare-col h3{margin-bottom:16px;font-size:1.1rem}
.compare-old h3{color:#ef4444}
.compare-new h3{color:var(--primary)}
.compare-col ul{list-style:none}
.compare-col li{padding:8px 0;font-size:.9rem;color:var(--text-muted);border-bottom:1px solid var(--border)}
.compare-old li::before{content:"✗ ";color:#ef4444}
.compare-new li::before{content:"✓ ";color:var(--primary)}
.compare-vs{display:flex;align-items:center;padding:0 20px;font-size:1.5rem;font-weight:700;color:var(--text-muted)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
details{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
summary{padding:18px 24px;cursor:pointer;font-weight:600;color:#fff;font-size:1rem;transition:background .2s}
summary:hover{background:rgba(0,229,255,.05)}
details p{padding:0 24px 18px;color:var(--text-muted);line-height:1.8}
details[open] summary{color:var(--primary);border-bottom:1px solid var(--border)}

/* CTA */
.cta-section{text-align:center}
.download-links{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.download-btn{display:flex;align-items:center;gap:12px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 24px;transition:border-color .2s,transform .2s}
.download-btn:hover{border-color:var(--primary);transform:translateY(-2px)}
.dl-icon{font-size:2rem}
.dl-text{text-align:left;color:#fff;font-weight:600}
.dl-text small{display:block;font-weight:400;color:var(--text-muted);font-size:.8rem}
.cta-stats{color:var(--text-muted);font-size:.9rem}
.cta-stats strong{color:var(--primary)}

/* Footer */
.site-footer{background:var(--bg-alt);border-top:1px solid var(--border);padding:60px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer-brand h3{color:var(--primary);font-size:1.3rem;margin-bottom:12px}
.footer-brand p{color:var(--text-muted);font-size:.85rem;line-height:1.7;margin-bottom:16px}
.footer-contact p{color:var(--text-muted);font-size:.8rem;line-height:1.8}
.footer-nav h4{color:#fff;font-size:.9rem;margin-bottom:12px}
.footer-nav a{display:block;color:var(--text-muted);font-size:.85rem;padding:4px 0;transition:color .2s}
.footer-nav a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);padding-top:20px;text-align:center}
.footer-links{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:12px}
.footer-links a{color:var(--text-muted);font-size:.8rem}
.copyright{color:var(--text-muted);font-size:.8rem}

/* Responsive */
@media(max-width:1024px){
.grid-5{grid-template-columns:repeat(3,1fr)}
.footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
.menu-toggle{display:block}
#mainNav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--bg-dark);flex-direction:column;padding:20px;border-bottom:1px solid var(--border)}
#mainNav.active{display:flex}
.hero-section h1{font-size:1.8rem}
.hero-stats{gap:20px}
.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}
.metrics-grid{grid-template-columns:repeat(2,1fr)}
.compare-table{flex-direction:column}
.compare-vs{justify-content:center;padding:12px 0}
.rank-item{flex-direction:column;text-align:center}
.footer-grid{grid-template-columns:1fr}
.download-links{flex-direction:column;align-items:center}
}
@media(max-width:480px){
.hero-section{padding:90px 0 60px}
.section{padding:50px 0}
.hero-stats{flex-direction:column;gap:12px}
.metrics-grid{grid-template-columns:1fr}
}