/* 快连官网 - 全局样式 */
* { 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: #333; line-height: 1.6; background: #fff; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* 导航栏 */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.97); box-shadow: 0 1px 8px rgba(0,0,0,0.08); height: 64px; display: flex; align-items: center; }
.nav-inner { max-width: 1200px; margin: 0 auto; width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; }
.nav-logo { font-size: 24px; font-weight: 700; color: #1a56db; letter-spacing: 2px; }
.nav-logo span { color: #0d47a1; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { font-size: 15px; color: #555; transition: color 0.2s; padding: 4px 0; }
.nav-links a:hover { color: #1a56db; }
.nav-cta a { background: #1a56db; color: #fff !important; padding: 8px 20px; border-radius: 6px; font-size: 14px; transition: background 0.2s; }
.nav-cta a:hover { background: #1447b8; }
.nav-toggle { display: none; font-size: 24px; color: #333; cursor: pointer; }

/* Hero区域 */
.hero { margin-top: 64px; background: linear-gradient(135deg, #0d2137 0%, #1a3a5c 40%, #1a56db 100%); color: #fff; padding: 100px 24px 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle at 30% 50%, rgba(26,86,219,0.15) 0%, transparent 50%), radial-gradient(circle at 70% 80%, rgba(59,130,246,0.1) 0%, transparent 40%); }
.hero-content { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
.hero h1 { font-size: 48px; font-weight: 800; margin-bottom: 16px; letter-spacing: 2px; }
.hero .subtitle { font-size: 20px; opacity: 0.9; margin-bottom: 12px; }
.hero .highlights { font-size: 15px; opacity: 0.75; margin-bottom: 40px; letter-spacing: 1px; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary { display: inline-block; background: #fff; color: #1a56db; padding: 14px 36px; border-radius: 8px; font-size: 16px; font-weight: 600; transition: transform 0.2s, box-shadow 0.2s; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
.btn-secondary { display: inline-block; border: 2px solid rgba(255,255,255,0.6); color: #fff; padding: 12px 32px; border-radius: 8px; font-size: 16px; transition: background 0.2s, border-color 0.2s; }
.btn-secondary:hover { background: rgba(255,255,255,0.1); border-color: #fff; }

/* 通用区块 */
.section { padding: 80px 24px; max-width: 1200px; margin: 0 auto; }
.section-title { text-align: center; font-size: 32px; font-weight: 700; color: #1a1a1a; margin-bottom: 12px; }
.section-desc { text-align: center; font-size: 16px; color: #666; margin-bottom: 48px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* 亮点卡片 */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { background: #f8faff; border: 1px solid #e8eef6; border-radius: 12px; padding: 32px 24px; text-align: center; transition: transform 0.2s, box-shadow 0.2s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(26,86,219,0.1); }
.feature-icon { font-size: 40px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; color: #1a1a1a; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: #666; line-height: 1.7; }

/* 下载区域 */
.download-section { background: #f5f8ff; }
.download-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.download-card { background: #fff; border-radius: 12px; padding: 32px 24px; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,0.06); transition: transform 0.2s, box-shadow 0.2s; }
.download-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
.download-card .platform-icon { font-size: 48px; margin-bottom: 12px; }
.download-card h3 { font-size: 18px; margin-bottom: 8px; color: #1a1a1a; }
.download-card .version { font-size: 13px; color: #999; margin-bottom: 16px; }
.download-card a.dl-btn { display: inline-block; background: #1a56db; color: #fff; padding: 10px 28px; border-radius: 6px; font-size: 14px; transition: background 0.2s; }
.download-card a.dl-btn:hover { background: #1447b8; }

/* 产品优势 */
.advantage-row { display: flex; align-items: center; gap: 48px; margin-bottom: 48px; }
.advantage-row:nth-child(even) { flex-direction: row-reverse; }
.advantage-text { flex: 1; }
.advantage-text h3 { font-size: 24px; color: #1a1a1a; margin-bottom: 12px; }
.advantage-text p { font-size: 15px; color: #555; line-height: 1.8; }
.advantage-visual { flex: 1; background: linear-gradient(135deg, #e8f0fe, #d4e4fc); border-radius: 16px; height: 240px; display: flex; align-items: center; justify-content: center; font-size: 64px; }

/* 用户评价 */
.testimonials { background: #f5f8ff; }
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: #fff; border-radius: 12px; padding: 28px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.testimonial-card .stars { color: #f5a623; font-size: 16px; margin-bottom: 12px; }
.testimonial-card .quote { font-size: 14px; color: #555; line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.testimonial-card .author { font-size: 13px; color: #999; }
.stats-bar { display: flex; justify-content: center; gap: 64px; margin-top: 48px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-item .num { font-size: 36px; font-weight: 800; color: #1a56db; }
.stat-item .label { font-size: 14px; color: #666; margin-top: 4px; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid #e8eef6; border-radius: 10px; margin-bottom: 16px; overflow: hidden; }
.faq-item h3 { background: #f8faff; padding: 18px 24px; font-size: 16px; color: #1a56db; cursor: default; }
.faq-item .faq-answer { padding: 20px 24px; }
.faq-item .faq-answer p { font-size: 14px; color: #555; line-height: 1.8; margin-bottom: 8px; }
.faq-item .faq-answer ol { padding-left: 20px; }
.faq-item .faq-answer ol li { font-size: 14px; color: #555; line-height: 1.8; margin-bottom: 6px; }

/* 指南页 */
.guide-steps { max-width: 800px; margin: 0 auto; }
.guide-step { display: flex; gap: 24px; margin-bottom: 32px; align-items: flex-start; }
.step-num { background: #1a56db; color: #fff; width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 18px; flex-shrink: 0; }
.step-content h3 { font-size: 18px; color: #1a1a1a; margin-bottom: 8px; }
.step-content p { font-size: 14px; color: #555; line-height: 1.8; }

/* 关于页 */
.about-hero { background: linear-gradient(135deg, #0d2137, #1a56db); color: #fff; padding: 120px 24px 60px; text-align: center; margin-top: 64px; }
.about-hero h1 { font-size: 36px; margin-bottom: 12px; }
.about-hero p { font-size: 16px; opacity: 0.85; max-width: 600px; margin: 0 auto; }
.about-values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.value-card { text-align: center; padding: 32px 24px; }
.value-card .icon { font-size: 40px; margin-bottom: 12px; }
.value-card h3 { font-size: 18px; margin-bottom: 8px; color: #1a1a1a; }
.value-card p { font-size: 14px; color: #666; line-height: 1.7; }

/* 下载中心页 */
.download-hero { background: linear-gradient(135deg, #0d2137, #1a56db); color: #fff; padding: 120px 24px 60px; text-align: center; margin-top: 64px; }
.download-hero h1 { font-size: 36px; margin-bottom: 12px; }
.download-hero p { font-size: 16px; opacity: 0.85; }
.dl-platforms { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 800px; margin: 48px auto 0; }
.dl-platform-card { background: #fff; border: 1px solid #e8eef6; border-radius: 12px; padding: 36px; text-align: center; transition: box-shadow 0.2s; }
.dl-platform-card:hover { box-shadow: 0 8px 24px rgba(26,86,219,0.12); }
.dl-platform-card .icon { font-size: 48px; margin-bottom: 12px; }
.dl-platform-card h3 { font-size: 20px; margin-bottom: 6px; }
.dl-platform-card .ver { font-size: 13px; color: #999; margin-bottom: 16px; }
.dl-platform-card a { display: inline-block; background: #1a56db; color: #fff; padding: 12px 32px; border-radius: 6px; font-size: 15px; transition: background 0.2s; }
.dl-platform-card a:hover { background: #1447b8; }

/* 隐私/条款页 */
.legal-hero { background: linear-gradient(135deg, #0d2137, #1a56db); color: #fff; padding: 120px 24px 48px; text-align: center; margin-top: 64px; }
.legal-hero h1 { font-size: 32px; margin-bottom: 8px; }
.legal-hero p { font-size: 14px; opacity: 0.7; }
.legal-content { max-width: 800px; margin: 0 auto; padding: 48px 24px 80px; }
.legal-content h2 { font-size: 20px; color: #1a1a1a; margin: 32px 0 12px; }
.legal-content p, .legal-content li { font-size: 14px; color: #555; line-height: 1.8; margin-bottom: 8px; }
.legal-content ul, .legal-content ol { padding-left: 20px; margin-bottom: 16px; }

/* Footer */
.footer { background: #0d1b2a; color: rgba(255,255,255,0.7); padding: 48px 24px 24px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand .logo { font-size: 22px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 13px; color: rgba(255,255,255,0.6); margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { max-width: 1200px; margin: 32px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 12px; }

/* 响应式 */
@media (max-width: 1024px) {
  .features-grid, .download-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .testimonial-grid { grid-template-columns: 1fr 1fr; }
  .about-values { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.active { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: #fff; padding: 16px 24px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); gap: 16px; }
  .hero h1 { font-size: 32px; }
  .hero .subtitle { font-size: 16px; }
  .features-grid, .download-grid { grid-template-columns: 1fr; }
  .advantage-row, .advantage-row:nth-child(even) { flex-direction: column; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .stats-bar { gap: 32px; }
  .footer-inner { grid-template-columns: 1fr; }
  .dl-platforms { grid-template-columns: 1fr; }
  .about-values { grid-template-columns: 1fr; }
  .section { padding: 48px 16px; }
  .section-title { font-size: 26px; }
}