:root {
  --brand: #0066CC;
  --brand-dark: #004C99;
  --brand-light: #E6F2FF;
  --accent: #00B8D4;
  --text: #1F2937;
  --text-secondary: #4B5563;
  --bg: #F8FAFC;
  --white: #FFFFFF;
  --border: #E5E7EB;
  --radius: 10px;
  --shadow: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
.container { width: min(1180px, 92%); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none !important;
}
.brand img { border-radius: 8px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 1.1rem; color: var(--brand); }
.brand-text span { font-size: 0.8rem; color: var(--text-secondary); letter-spacing: 1px; }
.main-nav { display: flex; align-items: center; gap: 2rem; }
.main-nav ul { display: flex; gap: 1.6rem; list-style: none; margin: 0; padding: 0; }
.main-nav a { color: var(--text); font-weight: 500; font-size: 0.95rem; }
.main-nav a:hover, .main-nav a.active { color: var(--brand); text-decoration: none; }
.menu-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; padding: 6px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 0.75rem 1.5rem; border-radius: var(--radius); font-weight: 600; transition: all 0.2s; border: none; cursor: pointer; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); text-decoration: none; }
.btn-outline { background: transparent; color: var(--brand); border: 2px solid var(--brand); }
.btn-outline:hover { background: var(--brand-light); }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.85rem; }
.btn-lg { padding: 0.9rem 2rem; font-size: 1.05rem; }

/* Hero */
.hero {
  position: relative;
  background: linear-gradient(135deg, #002B55 0%, #004C99 50%, #0066CC 100%);
  color: #fff;
  padding: 100px 0 120px;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.2; margin: 0 0 1.2rem; font-weight: 800; }
.hero h1 strong { color: var(--accent); }
.hero p { font-size: 1.15rem; opacity: 0.92; margin: 0 0 2rem; max-width: 560px; }
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-image { display: flex; justify-content: center; align-items: center; }
.hero-image img { border-radius: 16px; box-shadow: 0 24px 60px rgba(0,0,0,0.25); max-height: 420px; object-fit: cover; }

/* Sections */
section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 56px; }
.section-title h2 { font-size: 2rem; color: var(--brand-dark); margin: 0 0 0.6rem; }
.section-title p { color: var(--text-secondary); font-size: 1.05rem; margin: 0; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; }
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-img { height: 200px; display: flex; align-items: center; justify-content: center; background: var(--brand-light); padding: 20px; }
.card-img img { max-height: 100%; object-fit: contain; }
.card-body { padding: 26px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { margin: 0 0 0.6rem; font-size: 1.25rem; color: var(--brand-dark); }
.card-body p { color: var(--text-secondary); margin: 0 0 1rem; font-size: 0.95rem; flex: 1; }
.card-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 1rem; }
.tag { font-size: 0.75rem; background: var(--brand-light); color: var(--brand-dark); padding: 4px 10px; border-radius: 20px; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.feature {
  background: var(--white);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.feature h3 { margin: 0 0 0.6rem; font-size: 1.1rem; color: var(--brand); }
.feature p { margin: 0; color: var(--text-secondary); font-size: 0.92rem; }
.feature .icon {
  width: 48px; height: 48px; border-radius: 10px; background: var(--brand-light);
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem; margin-bottom: 14px;
}

/* Stats */
.stats-bar {
  background: var(--white);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat strong { display: block; font-size: 2rem; color: var(--brand); }
.stat span { color: var(--text-secondary); font-size: 0.9rem; }

/* CTA */
.cta-section {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #fff;
  padding: 80px 0;
  text-align: center;
}
.cta-section h2 { margin: 0 0 1rem; font-size: 2rem; }
.cta-section p { margin: 0 auto 2rem; max-width: 640px; opacity: 0.92; }

/* Product detail */
.product-hero { background: var(--white); padding: 60px 0; }
.product-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.product-gallery { background: var(--bg); border-radius: var(--radius); padding: 24px; display: flex; align-items: center; justify-content: center; min-height: 360px; }
.product-gallery img { max-height: 360px; object-fit: contain; }
.product-meta h1 { margin: 0 0 0.5rem; font-size: 2rem; color: var(--brand-dark); }
.product-subtitle { color: var(--text-secondary); margin-bottom: 1.5rem; }
.product-highlights { list-style: none; padding: 0; margin: 0 0 1.5rem; }
.product-highlights li { padding: 8px 0; padding-left: 26px; position: relative; color: var(--text-secondary); }
.product-highlights li::before { content: "✓"; position: absolute; left: 0; color: var(--brand); font-weight: bold; }

/* Tabs */
.tabs { display: flex; gap: 8px; border-bottom: 2px solid var(--border); margin-bottom: 24px; flex-wrap: wrap; }
.tab-btn { background: none; border: none; padding: 12px 20px; font-weight: 600; color: var(--text-secondary); cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -2px; }
.tab-btn.active { color: var(--brand); border-bottom-color: var(--brand); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Tables */
.spec-table { width: 100%; border-collapse: collapse; background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.spec-table th, .spec-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); }
.spec-table th { background: var(--brand-light); color: var(--brand-dark); font-weight: 700; }
.spec-table tr:last-child td { border-bottom: none; }

/* Lists */
.check-list { list-style: none; padding: 0; }
.check-list li { padding: 10px 0 10px 30px; position: relative; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--brand); font-weight: bold; }

/* Solutions */
.solution-card { background: var(--white); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-sm); margin-bottom: 28px; }
.solution-card h3 { color: var(--brand-dark); margin-top: 0; }

/* About / Contact */
.about-hero { background: var(--white); padding: 60px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-card { background: var(--white); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-sm); }
.contact-card h2 { margin-top: 0; color: var(--brand-dark); }
.contact-list { list-style: none; padding: 0; }
.contact-list li { padding: 12px 0; border-bottom: 1px solid var(--border); display: flex; gap: 12px; align-items: flex-start; }
.contact-list li:last-child { border-bottom: none; }
.contact-list strong { color: var(--brand); min-width: 80px; }
.qr-wrap { text-align: center; }
.qr-wrap img { max-width: 240px; border: 1px solid var(--border); border-radius: var(--radius); }

/* FAQ */
.faq-item { background: var(--white); border-radius: var(--radius); margin-bottom: 16px; box-shadow: var(--shadow-sm); overflow: hidden; }
.faq-question { width: 100%; background: none; border: none; padding: 18px 22px; text-align: left; font-size: 1rem; font-weight: 600; color: var(--brand-dark); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-answer { padding: 0 22px 18px; color: var(--text-secondary); display: none; }

/* Footer */
.site-footer { background: #0B1F33; color: #CBD5E1; padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; }
.footer-brand .brand-text strong { color: #fff; }
.footer-brand p { margin: 12px 0 0; opacity: 0.8; }
.footer-links h4, .footer-products h4, .footer-contact h4 { color: #fff; margin: 0 0 1rem; font-size: 1rem; }
.footer-links ul, .footer-products ul, .footer-contact ul { list-style: none; padding: 0; margin: 0; }
.footer-links li, .footer-products li, .footer-contact li { padding: 6px 0; font-size: 0.9rem; }
.footer-links a, .footer-products a { color: #CBD5E1; }
.footer-contact a { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 40px; padding-top: 20px; text-align: center; font-size: 0.85rem; }
.footer-bottom a { color: #CBD5E1; }

/* Breadcrumb */
.breadcrumb { background: var(--white); border-bottom: 1px solid var(--border); padding: 16px 0; }
.breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; gap: 8px; flex-wrap: wrap; font-size: 0.85rem; color: var(--text-secondary); }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb li:last-child { color: var(--brand); }

/* Responsive */
@media (max-width: 900px) {
  .hero .container, .product-layout, .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { position: absolute; top: 72px; left: 0; right: 0; background: var(--white); border-bottom: 1px solid var(--border); flex-direction: column; padding: 20px; display: none; }
  .main-nav.open { display: flex; }
  .main-nav ul { flex-direction: column; gap: 1rem; width: 100%; }
  .menu-toggle { display: flex; }
}
@media (max-width: 640px) {
  .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 70px 0 90px; }
}

/* Blog */
.blog-article h2 { color: var(--brand-dark); margin-top: 2rem; margin-bottom: 1rem; font-size: 1.5rem; }
.blog-article h3 { color: var(--brand); margin-top: 1.5rem; margin-bottom: 0.8rem; }
.blog-article p { margin-bottom: 1.2rem; }
.blog-article ul, .blog-article ol { margin-bottom: 1.2rem; padding-left: 1.5rem; }
.blog-article li { margin-bottom: 0.5rem; }
.blog-article table { margin: 1.5rem 0; }
.blog-list-meta { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1rem; }