/* TradingView官网 - 全局样式表 */
/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#1a1a2e;background:#f8f9fb;line-height:1.7;-webkit-font-smoothing:antialiased}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
a{color:#2962ff;text-decoration:none;transition:color .2s}
a:hover{color:#0039cb}
ul{list-style:none}
img{max-width:100%;height:auto}

/* Header */
.header{background:#fff;border-bottom:1px solid #e8ecf1;position:sticky;top:0;z-index:100;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.header .container{display:flex;align-items:center;justify-content:space-between;padding-top:12px;padding-bottom:12px}
.logo a{display:flex;align-items:center;gap:10px;color:#1a1a2e;font-size:1.4rem;font-weight:700}
.logo img{width:32px;height:32px}
.logo-text{letter-spacing:-.5px}
.main-nav ul{display:flex;gap:4px}
.main-nav a{padding:8px 16px;border-radius:6px;font-size:.95rem;font-weight:500;color:#555;transition:all .2s}
.main-nav a:hover,.main-nav a.active{color:#2962ff;background:#eef2ff}
.header-actions .btn{padding:10px 22px;border-radius:8px;font-weight:600;font-size:.95rem}
.btn-primary{background:#2962ff;color:#fff!important;border:2px solid #2962ff}
.btn-primary:hover{background:#0039cb;border-color:#0039cb}
.btn-secondary{background:transparent;color:#2962ff;border:2px solid #2962ff}
.btn-secondary:hover{background:#eef2ff}
.btn-large{padding:14px 36px;font-size:1.1rem;border-radius:10px}
.btn-block{display:block;text-align:center}

/* Hero */
.hero{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%);color:#fff;padding:80px 0}
.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero h1{font-size:2.6rem;line-height:1.3;margin-bottom:20px;font-weight:800}
.hero-subtitle{font-size:1.15rem;line-height:1.8;color:#c4cfde;margin-bottom:32px}
.hero-buttons{display:flex;gap:16px;flex-wrap:wrap}
.hero-placeholder{background:rgba(255,255,255,.08);border-radius:16px;padding:120px 40px;text-align:center;color:#8899aa;font-size:1.1rem;border:1px dashed rgba(255,255,255,.15)}

/* Page Hero */
.page-hero{background:linear-gradient(135deg,#1a1a2e 0%,#0f3460 100%);color:#fff;padding:60px 0;text-align:center}
.page-hero h1{font-size:2.2rem;font-weight:800;margin-bottom:12px}

/* Breadcrumb */
.breadcrumb{background:#fff;border-bottom:1px solid #eef1f5;padding:12px 0}
.breadcrumb ol{display:flex;gap:8px;font-size:.9rem}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:8px;color:#bbb}
.breadcrumb a{color:#666}
.breadcrumb span{color:#2962ff;font-weight:500}

/* Sections */
section{padding:64px 0}
.section-desc{font-size:1.1rem;color:#666;margin-bottom:40px;text-align:center;max-width:700px;margin-left:auto;margin-right:auto}
h2{font-size:1.9rem;font-weight:700;margin-bottom:16px;text-align:center;color:#1a1a2e}

/* Features Grid */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:32px 24px;text-align:center;border:1px solid #eee;transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.08)}
.feature-icon{font-size:2.4rem;margin-bottom:16px}
.feature-card h3{font-size:1.15rem;margin-bottom:10px}
.feature-card h3 a{color:#1a1a2e}
.feature-card h3 a:hover{color:#2962ff}
.feature-card p{font-size:.93rem;color:#666;line-height:1.7}

/* Why Us */
.why-us{background:#fff}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.why-item h3{font-size:2.4rem;color:#2962ff;font-weight:800}
.why-item p{color:#666;font-size:1.05rem;margin-top:8px}

/* Q&A Section */
.qa-section{background:#fff}
.qa-section h2{text-align:center}
.qa-item{background:#f8f9fb;border-radius:12px;padding:36px;margin-bottom:32px;border:1px solid #eef1f5}
.qa-item h3{font-size:1.3rem;color:#1a1a2e;margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid #2962ff}
.qa-question{margin-bottom:20px;color:#555;font-style:italic}
.step{margin-bottom:18px;padding-left:8px}
.step-number{font-weight:700;color:#2962ff;display:inline-block;margin-right:4px}
.step p{display:inline;color:#333;line-height:1.8}

/* Content Section */
.content-section{padding:40px 0}
.content-block{margin-bottom:48px}
.content-block h2,.feature-detail h2{text-align:left;font-size:1.6rem;margin-bottom:16px}
.feature-detail{margin-bottom:48px}
.feature-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:24px}
.feature-list-item{background:#fff;border-radius:10px;padding:24px;border:1px solid #eee}
.feature-list-item h3{font-size:1.1rem;margin-bottom:8px;color:#1a1a2e}
.feature-list-item p{font-size:.93rem;color:#555;line-height:1.7}

/* Pricing */
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:48px}
.pricing-card{background:#fff;border-radius:12px;padding:32px 24px;border:1px solid #eee;text-align:center;position:relative}
.pricing-recommended{border:2px solid #2962ff;box-shadow:0 4px 20px rgba(41,98,255,.12)}
.pricing-badge{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:#2962ff;color:#fff;padding:4px 20px;border-radius:20px;font-size:.85rem;font-weight:600}
.pricing-header h2{font-size:1.4rem;margin-bottom:8px}
.pricing-price{font-size:2rem;font-weight:800;color:#2962ff}
.pricing-period{color:#888;font-size:.95rem;margin-bottom:20px}
.pricing-features ul{text-align:left;margin-bottom:24px}
.pricing-features li{padding:8px 0;border-bottom:1px solid #f0f2f5;font-size:.93rem;color:#444}
.pricing-features li::before{content:"✓ ";color:#2962ff;font-weight:700}

/* Download Grid */
.download-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-bottom:48px}
.download-card{background:#fff;border-radius:12px;padding:32px;border:1px solid #eee}
.download-icon{font-size:2.6rem;margin-bottom:16px}
.download-card h2{text-align:left;font-size:1.3rem;margin-bottom:12px}
.download-card p{color:#555;margin-bottom:16px;line-height:1.7}
.download-info{margin-bottom:20px}
.download-info li{font-size:.9rem;color:#777;padding:4px 0}
.download-info li::before{content:"• ";color:#2962ff}

/* Help Grid */
.help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.help-card{background:#fff;border-radius:12px;padding:28px 24px;border:1px solid #eee;transition:transform .2s}
.help-card:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,0,0,.06)}
.help-card h2{text-align:left;font-size:1.15rem;margin-bottom:10px}
.help-card p{font-size:.93rem;color:#666;line-height:1.7}

/* Chart Type Grid */
.chart-type-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px}
.chart-type-card{background:#fff;border-radius:12px;padding:28px 24px;border:1px solid #eee}
.chart-type-card h2{text-align:left;font-size:1.15rem;margin-bottom:10px}
.chart-type-card p{font-size:.93rem;color:#555;line-height:1.7}

/* Community Section */
.community-section{margin-bottom:40px}
.community-section h2{text-align:left;font-size:1.5rem;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid #2962ff}

/* CTA */
.cta{background:linear-gradient(135deg,#2962ff,#0039cb);color:#fff;text-align:center;padding:64px 0}
.cta h2{color:#fff;margin-bottom:12px}
.cta p{color:rgba(255,255,255,.85);margin-bottom:24px;font-size:1.1rem}

/* Footer */
.footer{background:#1a1a2e;color:#c4cfde;padding:56px 0 28px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:40px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1.05rem;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col a{color:#8899aa;font-size:.93rem}
.footer-col a:hover{color:#fff}
.footer-col p{font-size:.9rem;line-height:1.7;color:#8899aa}
.footer-bottom{border-top:1px solid #2a2a4a;padding-top:24px;text-align:center;font-size:.85rem;color:#666}
.footer-bottom a{color:#8899aa}

/* Sitemap */
.sitemap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.sitemap-col h3{font-size:1.2rem;margin-bottom:16px;color:#1a1a2e;border-bottom:2px solid #2962ff;padding-bottom:8px}
.sitemap-col ul li{margin-bottom:12px}
.sitemap-col a{font-size:.95rem}

/* Responsive */
@media(max-width:992px){
  .features-grid,.why-grid,.pricing-grid{grid-template-columns:repeat(2,1fr)}
  .hero .container{grid-template-columns:1fr}
  .hero h1{font-size:2rem}
  .download-grid,.help-grid,.chart-type-grid,.sitemap-grid{grid-template-columns:1fr}
  .feature-list{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .features-grid,.why-grid,.pricing-grid{grid-template-columns:1fr}
  .header .container{flex-wrap:wrap;gap:12px}
  .main-nav ul{flex-wrap:wrap;gap:2px}
  .main-nav a{padding:6px 10px;font-size:.85rem}
  section{padding:40px 0}
  .hero{padding:48px 0}
}