/* TradingView 官网样式表 - SEO优化 */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"Microsoft YaHei",sans-serif;color:#131722;background:#fff;line-height:1.6}
a{text-decoration:none;color:#2962ff;transition:color .2s}
a:hover{color:#1e4bd2}
img{max-width:100%;height:auto}

/* 顶部导航 */
.header{background:#fff;border-bottom:1px solid #e0e3eb;position:sticky;top:0;z-index:1000;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;font-size:22px;font-weight:700;color:#131722}
.logo svg{margin-right:10px}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{padding:8px 16px;color:#434651;font-size:14px;font-weight:500;border-radius:6px;white-space:nowrap}
.nav a:hover,.nav a.active{color:#2962ff;background:#f0f3fa}

/* 主容器 */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{font-size:32px;font-weight:700;text-align:center;margin-bottom:16px;color:#131722}
.section-subtitle{font-size:16px;text-align:center;color:#6a6d78;margin-bottom:48px;max-width:700px;margin-left:auto;margin-right:auto}

/* Hero 区域 */
.hero{background:linear-gradient(135deg,#f0f3fa 0%,#e8ecf4 100%);padding:80px 0 60px}
.hero-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:60px}
.hero-text{flex:1}
.hero-text h1{font-size:42px;font-weight:800;line-height:1.2;margin-bottom:20px;color:#131722}
.hero-text h1 span{color:#2962ff}
.hero-text p{font-size:18px;color:#434651;margin-bottom:32px;line-height:1.7}
.hero-buttons{display:flex;gap:16px;flex-wrap:wrap}
.btn{padding:14px 32px;border-radius:8px;font-size:16px;font-weight:600;display:inline-block;text-align:center;cursor:pointer;border:none}
.btn-primary{background:#2962ff;color:#fff}
.btn-primary:hover{background:#1e4bd2;color:#fff}
.btn-outline{background:#fff;color:#2962ff;border:2px solid #2962ff}
.btn-outline:hover{background:#f0f3fa;color:#1e4bd2}
.hero-img{flex:1;text-align:center}
.hero-img .placeholder{width:100%;max-width:520px;height:340px;background:#fff;border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,.08);display:flex;align-items:center;justify-content:center;margin:0 auto}

/* 特性卡片 */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:#fff;border:1px solid #e0e3eb;border-radius:12px;padding:32px 24px;transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.08)}
.feature-card .icon{font-size:36px;margin-bottom:16px}
.feature-card h3{font-size:18px;font-weight:700;margin-bottom:10px;color:#131722}
.feature-card p{font-size:14px;color:#6a6d78;line-height:1.7}

/* FAQ */
.faq-category{margin-bottom:40px}
.faq-category h3{font-size:22px;font-weight:700;color:#131722;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #2962ff}
.faq-item{background:#f8f9fc;border:1px solid #e0e3eb;border-radius:10px;padding:24px;margin-bottom:16px}
.faq-item h4{font-size:16px;font-weight:600;color:#131722;margin-bottom:12px}
.faq-item .steps{margin-left:20px}
.faq-item .steps li{margin-bottom:8px;font-size:14px;color:#434651;line-height:1.7}
.faq-item .step-label{font-weight:600;color:#2962ff}

/* 价格表 */
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.pricing-card{background:#fff;border:1px solid #e0e3eb;border-radius:12px;padding:32px 20px;text-align:center;transition:transform .2s}
.pricing-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.08)}
.pricing-card.featured{border:2px solid #2962ff;box-shadow:0 4px 20px rgba(41,98,255,.1)}
.pricing-card .plan-name{font-size:18px;font-weight:700;margin-bottom:8px;color:#131722}
.pricing-card .plan-price{font-size:36px;font-weight:800;color:#2962ff;margin-bottom:16px}
.pricing-card .plan-price span{font-size:14px;color:#6a6d78;font-weight:400}
.pricing-card ul{list-style:none;margin-bottom:24px;text-align:left}
.pricing-card ul li{padding:8px 0;font-size:14px;color:#434651;border-bottom:1px solid #f0f3fa}
.pricing-card ul li::before{content:"✓ ";color:#22ab94;font-weight:700}
.pricing-card .btn{width:100%}

/* 关于页 */
.about-content{max-width:800px;margin:0 auto}
.about-content h2{font-size:26px;font-weight:700;margin:32px 0 16px;color:#131722}
.about-content p{font-size:15px;color:#434651;line-height:1.8;margin-bottom:16px}
.about-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:40px 0}
.stat-card{text-align:center;padding:24px;background:#f8f9fc;border-radius:10px}
.stat-card .stat-num{font-size:32px;font-weight:800;color:#2962ff}
.stat-card .stat-label{font-size:14px;color:#6a6d78;margin-top:8px}

/* 下载页 */
.download-hero{background:linear-gradient(135deg,#131722 0%,#1e2537 100%);color:#fff;padding:60px 0;text-align:center}
.download-hero h1{font-size:36px;font-weight:800;margin-bottom:16px}
.download-hero p{font-size:16px;color:#a3a8b8;margin-bottom:32px}
.download-options{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:40px 0}
.download-card{background:#fff;border:1px solid #e0e3eb;border-radius:12px;padding:32px 20px;text-align:center}
.download-card .platform-icon{font-size:40px;margin-bottom:16px}
.download-card h3{font-size:18px;font-weight:700;margin-bottom:8px;color:#131722}
.download-card p{font-size:13px;color:#6a6d78;margin-bottom:20px}
.download-card .btn{width:100%}

/* 面包屑 */
.breadcrumb{background:#f8f9fc;padding:12px 0;font-size:13px;color:#6a6d78}
.breadcrumb a{color:#6a6d78}
.breadcrumb a:hover{color:#2962ff}
.breadcrumb span{color:#131722;font-weight:500}

/* 页脚 */
.footer{background:#131722;color:#a3a8b8;padding:48px 0 24px;margin-top:60px}
.footer-grid{max-width:1200px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:repeat(4,1fr);gap:32px}
.footer-col h4{font-size:16px;font-weight:700;color:#fff;margin-bottom:16px}
.footer-col a{display:block;color:#787b86;font-size:14px;padding:6px 0}
.footer-col a:hover{color:#2962ff}
.footer-bottom{max-width:1200px;margin:32px auto 0;padding:16px 20px 0;border-top:1px solid #2a2e39;text-align:center;font-size:12px;color:#5a5d68}
.footer-sitemap{text-align:center;margin-top:8px}
.footer-sitemap a{color:#5a5d68;font-size:12px;margin:0 8px}

/* 功能页特性细节 */
.feature-detail{display:flex;gap:40px;align-items:center;margin-bottom:48px;padding:24px;background:#f8f9fc;border-radius:12px}
.feature-detail:nth-child(even){flex-direction:row-reverse}
.feature-detail .detail-text{flex:1}
.feature-detail .detail-text h3{font-size:22px;font-weight:700;margin-bottom:12px;color:#131722}
.feature-detail .detail-text p{font-size:14px;color:#434651;line-height:1.8}
.feature-detail .detail-img{flex:1;text-align:center}
.feature-detail .placeholder-sm{width:100%;max-width:400px;height:240px;background:#e8ecf4;border-radius:10px;display:flex;align-items:center;justify-content:center;margin:0 auto;font-size:14px;color:#6a6d78}

/* 响应式 */
@media(max-width:768px){
  .hero-inner{flex-direction:column;text-align:center}
  .features-grid{grid-template-columns:1fr}
  .pricing-grid{grid-template-columns:1fr 1fr}
  .download-options{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .about-stats{grid-template-columns:1fr 1fr}
  .feature-detail{flex-direction:column!important}
  .hero-text h1{font-size:28px}
  .section-title{font-size:24px}
  .nav{justify-content:center}
}
@media(max-width:480px){
  .pricing-grid,.about-stats{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-buttons{flex-direction:column}
  .header-inner{flex-direction:column;height:auto;padding:12px 20px}
  .nav{margin-top:10px}
}