/* BitBrowser Official Website Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: #e0e0e0; background: #0a0e1a; line-height: 1.6; }
a { color: #4fc3f7; text-decoration: none; transition: color 0.3s; }
a:hover { color: #81d4fa; }

/* Navigation */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(10, 14, 26, 0.95); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(79, 195, 247, 0.1); padding: 0 40px; height: 70px; display: flex; align-items: center; justify-content: space-between; }
.navbar .logo { font-size: 22px; font-weight: 700; color: #fff; }
.navbar .logo span { color: #4fc3f7; }
.nav-links { display: flex; align-items: center; gap: 30px; list-style: none; }
.nav-links a { color: #b0bec5; font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: #4fc3f7; }
.nav-cta { display: flex; align-items: center; gap: 15px; }
.btn-primary { display: inline-block; background: linear-gradient(135deg, #4fc3f7, #00e676); color: #0a0e1a; padding: 10px 24px; border-radius: 6px; font-weight: 600; font-size: 14px; transition: transform 0.3s, box-shadow 0.3s; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(79, 195, 247, 0.3); color: #0a0e1a; }
.btn-secondary { display: inline-block; border: 1px solid #4fc3f7; color: #4fc3f7; padding: 10px 24px; border-radius: 6px; font-weight: 600; font-size: 14px; transition: all 0.3s; }
.btn-secondary:hover { background: rgba(79, 195, 247, 0.1); color: #4fc3f7; }

/* Hero Section */
.hero { padding: 160px 40px 100px; text-align: center; background: radial-gradient(ellipse at center, rgba(79, 195, 247, 0.08) 0%, transparent 70%); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(79,195,247,0.1)"/></svg>') repeat; background-size: 50px 50px; opacity: 0.3; }
.hero h1 { font-size: 48px; font-weight: 800; color: #fff; margin-bottom: 20px; position: relative; }
.hero h1 span { background: linear-gradient(135deg, #4fc3f7, #00e676); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero .subtitle { font-size: 18px; color: #90a4ae; max-width: 700px; margin: 0 auto 40px; position: relative; }
.hero-cta { display: flex; justify-content: center; gap: 20px; margin-bottom: 50px; position: relative; }
.hero-stats { display: flex; justify-content: center; gap: 60px; position: relative; }
.hero-stats .stat { text-align: center; }
.hero-stats .stat-number { font-size: 36px; font-weight: 800; color: #4fc3f7; }
.hero-stats .stat-label { font-size: 14px; color: #78909c; margin-top: 5px; }

/* Trust Bar */
.trust-bar { padding: 40px; text-align: center; border-top: 1px solid rgba(79, 195, 247, 0.1); border-bottom: 1px solid rgba(79, 195, 247, 0.1); background: rgba(79, 195, 247, 0.02); }
.trust-bar p { color: #78909c; font-size: 14px; margin-bottom: 20px; }
.trust-logos { display: flex; justify-content: center; align-items: center; gap: 40px; flex-wrap: wrap; }
.trust-logos span { color: #546e7a; font-size: 16px; font-weight: 600; padding: 8px 16px; border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 4px; }

/* Section Common */
.section { padding: 100px 40px; max-width: 1200px; margin: 0 auto; }
.section-title { text-align: center; margin-bottom: 60px; }
.section-title h2 { font-size: 36px; font-weight: 700; color: #fff; margin-bottom: 15px; }
.section-title p { font-size: 16px; color: #78909c; max-width: 600px; margin: 0 auto; }

/* Feature Cards */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.feature-card { background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 12px; padding: 35px; transition: transform 0.3s, border-color 0.3s; }
.feature-card:hover { transform: translateY(-5px); border-color: rgba(79, 195, 247, 0.3); }
.feature-card .icon { width: 50px; height: 50px; background: linear-gradient(135deg, rgba(79, 195, 247, 0.2), rgba(0, 230, 118, 0.2)); border-radius: 10px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; font-size: 24px; }
.feature-card h3 { font-size: 20px; color: #fff; margin-bottom: 12px; }
.feature-card p { font-size: 14px; color: #90a4ae; line-height: 1.8; }

/* Solutions Tabs */
.solutions-tabs { display: flex; gap: 15px; margin-bottom: 40px; flex-wrap: wrap; justify-content: center; }
.tab-btn { display: inline-block; padding: 10px 24px; border: 1px solid rgba(79, 195, 247, 0.2); border-radius: 20px; color: #90a4ae; font-size: 14px; transition: all 0.3s; }
.tab-btn:hover, .tab-btn.active { background: rgba(79, 195, 247, 0.1); border-color: #4fc3f7; color: #4fc3f7; }
.solution-content { background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 12px; padding: 40px; }
.solution-content h3 { font-size: 24px; color: #fff; margin-bottom: 15px; }
.solution-content p { color: #90a4ae; line-height: 1.8; margin-bottom: 20px; }

/* Pricing Cards */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; max-width: 1000px; margin: 0 auto; }
.pricing-card { background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 12px; padding: 40px; text-align: center; transition: transform 0.3s; position: relative; }
.pricing-card:hover { transform: translateY(-5px); }
.pricing-card.featured { border-color: #4fc3f7; background: rgba(79, 195, 247, 0.05); }
.pricing-card.featured::before { content: '推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: linear-gradient(135deg, #4fc3f7, #00e676); color: #0a0e1a; padding: 4px 16px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.pricing-card h3 { font-size: 22px; color: #fff; margin-bottom: 10px; }
.pricing-card .price { font-size: 42px; font-weight: 800; color: #4fc3f7; margin: 20px 0; }
.pricing-card .price span { font-size: 16px; color: #78909c; }
.pricing-card ul { list-style: none; margin: 25px 0; text-align: left; }
.pricing-card ul li { padding: 8px 0; color: #b0bec5; font-size: 14px; border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.pricing-card ul li::before { content: '✓'; color: #00e676; margin-right: 10px; }

/* Testimonials */
.testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px; }
.testimonial-card { background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 12px; padding: 30px; }
.testimonial-card .quote { color: #b0bec5; font-size: 15px; line-height: 1.8; margin-bottom: 20px; font-style: italic; }
.testimonial-card .author { display: flex; align-items: center; gap: 12px; }
.testimonial-card .avatar { width: 45px; height: 45px; background: linear-gradient(135deg, #4fc3f7, #00e676); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #0a0e1a; font-weight: 700; font-size: 18px; }
.testimonial-card .author-info .name { color: #fff; font-size: 14px; font-weight: 600; }
.testimonial-card .author-info .role { color: #78909c; font-size: 12px; }

/* Security Section */
.security-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 25px; }
.security-item { text-align: center; padding: 30px; background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 12px; }
.security-item .icon { font-size: 40px; margin-bottom: 15px; }
.security-item h4 { color: #fff; font-size: 16px; margin-bottom: 10px; }
.security-item p { color: #90a4ae; font-size: 13px; }

/* FAQ Section */
.faq-categories { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-bottom: 40px; }
.faq-category { display: inline-block; padding: 8px 20px; border: 1px solid rgba(79, 195, 247, 0.2); border-radius: 20px; color: #90a4ae; font-size: 13px; }
.faq-category:hover { border-color: #4fc3f7; color: #4fc3f7; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(79, 195, 247, 0.1); border-radius: 8px; margin-bottom: 15px; overflow: hidden; }
.faq-item summary { padding: 20px 25px; color: #fff; font-size: 16px; font-weight: 500; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::after { content: '+'; color: #4fc3f7; font-size: 20px; transition: transform 0.3s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-answer { padding: 0 25px 20px; color: #90a4ae; font-size: 14px; line-height: 1.8; }
.faq-item .faq-answer ol { padding-left: 20px; margin-top: 10px; }
.faq-item .faq-answer ol li { margin-bottom: 8px; }

/* CTA Banner */
.cta-banner { padding: 80px 40px; text-align: center; background: linear-gradient(135deg, rgba(79, 195, 247, 0.1), rgba(0, 230, 118, 0.05)); border-top: 1px solid rgba(79, 195, 247, 0.1); border-bottom: 1px solid rgba(79, 195, 247, 0.1); }
.cta-banner h2 { font-size: 32px; color: #fff; margin-bottom: 15px; }
.cta-banner p { color: #90a4ae; margin-bottom: 30px; font-size: 16px; }
.cta-banner .cta-buttons { display: flex; justify-content: center; gap: 20px; }

/* Footer */
.footer { padding: 60px 40px 30px; background: #060a14; border-top: 1px solid rgba(79, 195, 247, 0.1); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; max-width: 1200px; margin: 0 auto 40px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 20px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #78909c; font-size: 14px; }
.footer-col ul li a:hover { color: #4fc3f7; }
.footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid rgba(79, 195, 247, 0.1); max-width: 1200px; margin: 0 auto; }
.footer-bottom p { color: #546e7a; font-size: 13px; }
.footer-bottom .sitemap-link { margin-top: 10px; }
.footer-bottom .sitemap-link a { color: #4fc3f7; font-size: 13px; }

/* Data Panel */
.data-panel { display: flex; justify-content: center; gap: 50px; flex-wrap: wrap; margin-top: 40px; }
.data-item { text-align: center; }
.data-item .number { font-size: 42px; font-weight: 800; color: #4fc3f7; }
.data-item .label { font-size: 14px; color: #78909c; margin-top: 5px; }

/* Certification Wall */
.cert-wall { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; margin-top: 40px; }
.cert-item { padding: 15px 25px; border: 1px solid rgba(79, 195, 247, 0.15); border-radius: 8px; color: #b0bec5; font-size: 13px; text-align: center; }

/* Responsive */
@media (max-width: 768px) {
  .navbar { padding: 0 20px; }
  .nav-links { display: none; }
  .hero { padding: 120px 20px 60px; }
  .hero h1 { font-size: 32px; }
  .hero .subtitle { font-size: 16px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .section { padding: 60px 20px; }
  .section-title h2 { font-size: 28px; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}