/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; color: #333; line-height: 1.6; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Top Bar ===== */
.top-bar { background: #1a365d; color: #cbd5e0; font-size: 13px; padding: 8px 0; }
.top-bar-inner { display: flex; justify-content: space-between; align-items: center; }
.top-bar-right { display: flex; align-items: center; gap: 20px; }
.top-bar-right a { color: #90cdf4; }
.top-bar-right a:hover { color: #fff; }
.language-switch { cursor: pointer; font-weight: bold; color: #68d391; padding: 2px 10px; border: 1px solid #68d391; border-radius: 4px; font-size: 12px; }

/* ===== Header ===== */
.header { background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.08); position: sticky; top: 0; z-index: 1000; }
.header-inner { display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; }
.logo h1 { font-size: 22px; color: #1a365d; line-height: 1.2; }
.logo small { font-size: 12px; color: #718096; font-weight: normal; display: block; }
.header-contact { text-align: right; font-size: 13px; color: #718096; }
.header-contact strong { display: block; font-size: 22px; color: #e53e3e; margin-top: 2px; }
.mobile-toggle { display: none; font-size: 28px; background: none; border: none; cursor: pointer; color: #1a365d; }

/* ===== Navigation ===== */
.nav { background: #2b6cb0; }
.nav-inner ul { display: flex; }
.nav-inner li { position: relative; }
.nav-inner a { display: block; padding: 14px 22px; color: #ebf8ff; font-size: 15px; transition: background 0.2s; }
.nav-inner a:hover, .nav-inner li.active a { background: #1a365d; color: #fff; }

/* ===== Banner ===== */
.banner { min-height: 450px; position: relative; overflow: hidden; }
.slide { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.8s; }
.slide.active { opacity: 1; z-index: 1; }
.slide-content { text-align: center; color: #fff; padding: 40px 20px; max-width: 800px; }
.slide-content h2 { font-size: 36px; margin-bottom: 16px; font-weight: 700; }
.slide-content p { font-size: 18px; margin-bottom: 30px; opacity: 0.9; }
.btn { display: inline-block; padding: 14px 36px; background: #e53e3e; color: #fff; border-radius: 6px; font-size: 16px; font-weight: 600; transition: background 0.2s, transform 0.2s; }
.btn:hover { background: #c53030; transform: translateY(-2px); }

.banner-dots { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; z-index: 2; }
.dot { width: 12px; height: 12px; border-radius: 50%; background: rgba(255,255,255,0.4); cursor: pointer; transition: background 0.3s; }
.dot.active { background: #fff; }

.banner-prev, .banner-next { position: absolute; top: 50%; transform: translateY(-50%); z-index: 2; background: rgba(0,0,0,0.3); color: #fff; border: none; font-size: 30px; padding: 12px 18px; cursor: pointer; border-radius: 4px; transition: background 0.2s; }
.banner-prev:hover, .banner-next:hover { background: rgba(0,0,0,0.6); }
.banner-prev { left: 20px; }
.banner-next { right: 20px; }

/* ===== Sections ===== */
.section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 32px; color: #1a365d; margin-bottom: 8px; }
.section-title p { color: #718096; font-size: 16px; }
.section-title.light h2 { color: #fff; }
.section-title.light p { color: #cbd5e0; }

/* ===== About ===== */
.about-section { background: #fff; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.about-text p { font-size: 15px; line-height: 1.9; color: #4a5568; margin-bottom: 14px; }
.about-text strong { color: #2b6cb0; }
.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.stat { background: #ebf8ff; border: 1px solid #bee3f8; border-radius: 12px; padding: 30px 20px; text-align: center; transition: transform 0.3s; }
.stat:hover { transform: translateY(-5px); }
.stat .num { display: block; font-size: 42px; font-weight: 800; color: #2b6cb0; }
.stat .label { font-size: 14px; color: #4a5568; margin-top: 6px; display: block; }

/* ===== Products ===== */
.product-section { background: #f7fafc; }
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }
.product-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 12px rgba(0,0,0,0.06); transition: transform 0.3s, box-shadow 0.3s; }
.product-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
.product-img { height: 180px; background: linear-gradient(135deg, #2b6cb0, #1a365d); display: flex; align-items: center; justify-content: center; }
.product-icon { width: 64px; height: 64px; background: rgba(255,255,255,0.15); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; color: #fff; font-weight: bold; }
.product-info { padding: 20px; }
.product-info h3 { font-size: 18px; color: #1a365d; margin-bottom: 8px; }
.product-info p { font-size: 14px; color: #4a5568; line-height: 1.7; margin-bottom: 10px; }
.product-spec { font-size: 12px; color: #718096; background: #f7fafc; padding: 8px 12px; border-radius: 6px; }

/* ===== Advantages ===== */
.advantage-section { background: linear-gradient(135deg, #1a365d, #2b6cb0); }
.advantage-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.advantage-card { background: rgba(255,255,255,0.1); backdrop-filter: blur(8px); border-radius: 12px; padding: 30px; text-align: center; color: #fff; transition: transform 0.3s, background 0.3s; }
.advantage-card:hover { transform: translateY(-4px); background: rgba(255,255,255,0.18); }
.adv-icon { font-size: 40px; margin-bottom: 12px; }
.advantage-card h3 { font-size: 18px; margin-bottom: 10px; }
.advantage-card p { font-size: 14px; opacity: 0.85; line-height: 1.7; }

/* ===== Applications ===== */
.application-section { background: #fff; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 16px; }
.app-card { background: #f7fafc; border: 1px solid #e2e8f0; border-radius: 10px; padding: 30px 20px; text-align: center; transition: all 0.3s; cursor: default; }
.app-card:hover { border-color: #2b6cb0; background: #ebf8ff; transform: translateY(-3px); }
.app-icon { font-size: 36px; margin-bottom: 8px; }
.app-card h3 { font-size: 16px; color: #2d3748; }

/* ===== Contact ===== */
.contact-section { background: linear-gradient(135deg, #1a365d, #2b6cb0); }
.contact-content { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info { color: #fff; }
.contact-item { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.1); font-size: 15px; display: flex; align-items: center; gap: 10px; }
.contact-item .label { font-size: 20px; }
.contact-item a { color: #90cdf4; }
.contact-item a:hover { text-decoration: underline; }
.contact-cta { background: rgba(255,255,255,0.1); border-radius: 12px; padding: 40px; text-align: center; color: #fff; }
.contact-cta h3 { font-size: 22px; margin-bottom: 12px; }
.contact-cta p { font-size: 14px; opacity: 0.85; margin-bottom: 24px; }
.btn-lg { padding: 16px 50px; font-size: 18px; }

/* ===== Footer ===== */
.footer { background: #1a202c; color: #a0aec0; padding: 50px 0 0; }
.footer-inner { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-col p { font-size: 14px; margin-bottom: 8px; }
.footer-col a { display: block; font-size: 14px; color: #a0aec0; margin-bottom: 8px; }
.footer-col a:hover { color: #68d391; }
.footer-bottom { margin-top: 40px; padding: 20px 0; border-top: 1px solid #2d3748; text-align: center; font-size: 13px; }

/* ===== Animations ===== */
.advantage-card, .product-card, .app-card, .stat { opacity: 0; transform: translateY(30px); transition: opacity 0.6s, transform 0.6s; }
.animate-in { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .header-contact { display: none; }
  .nav-inner ul { display: none; flex-direction: column; }
  .nav-inner ul.open { display: flex; }
  .nav-inner a { padding: 12px 20px; }
  .about-content { grid-template-columns: 1fr; }
  .contact-content { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .slide-content h2 { font-size: 24px; }
  .slide-content p { font-size: 15px; }
  .product-grid { grid-template-columns: 1fr; }
  .banner-prev, .banner-next { display: none; }
  .section { padding: 50px 0; }
  .about-stats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .advantage-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr 1fr; }
  .stat .num { font-size: 32px; }
}