:root {
  --primary: #1a365d;
  --primary-dark: #0f2744;
  --secondary: #2b6cb0;
  --accent: #e67e22;
  --accent-hover: #d35400;
  --bg: #f8f9fa;
  --bg-alt: #ffffff;
  --text: #2d3748;
  --text-light: #718096;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --container: 1200px;
  --header-height: 70px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif; font-size: 16px; line-height: 1.6; color: var(--text); background: var(--bg); }
a { color: var(--secondary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section.alt-bg { background: var(--bg-alt); }
.section-title { font-size: 2.5rem; text-align: center; margin-bottom: 1rem; color: var(--primary); }
.section-desc { text-align: center; max-width: 700px; margin: 0 auto 3rem; color: var(--text-light); }
.section-more { text-align: center; margin-top: 3rem; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: var(--radius); font-weight: 600; cursor: pointer; transition: all 0.2s; border: 2px solid transparent; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-secondary { background: var(--primary); color: #fff; }
.btn-secondary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

.site-header { position: sticky; top: 0; z-index: 100; background: #fff; box-shadow: var(--shadow); height: var(--header-height); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-height); }
.logo { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 1.25rem; color: var(--primary); }
.logo-img { height: 40px; width: auto; }
.nav-list { display: flex; gap: 32px; }
.nav-link { color: var(--text); font-weight: 500; }
.nav-link:hover, .nav-link.active { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 16px; }
.lang-switch { display: flex; gap: 8px; }
.lang-btn { padding: 6px 12px; border: 1px solid var(--border); border-radius: 4px; font-size: 0.875rem; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { width: 24px; height: 2px; background: var(--text); transition: 0.2s; }

.hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; }
.hero-overlay { position: absolute; inset: 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="40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></svg>') center/200px; opacity: 0.5; }
.hero-content { position: relative; max-width: 800px; }
.hero h1 { font-size: 3.5rem; line-height: 1.2; margin-bottom: 1.5rem; }
.hero-subtitle { font-size: 1.5rem; opacity: 0.9; margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.product-grid, .advantages-grid, .categories-grid { display: grid; gap: 24px; }
.product-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.product-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s; }
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.product-card a { display: block; color: inherit; }
.product-card-image { aspect-ratio: 4/3; background: var(--bg); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-card-image img { width: 100%; height: 100%; object-fit: cover; }
.product-card-body { padding: 20px; }
.product-card-category { display: inline-block; font-size: 0.75rem; text-transform: uppercase; color: var(--accent); font-weight: 600; margin-bottom: 8px; }
.product-card h3 { font-size: 1.125rem; margin-bottom: 8px; color: var(--primary); }
.product-card p { font-size: 0.875rem; color: var(--text-light); }

.advantages-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.advantage-card { text-align: center; padding: 32px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); }
.advantage-icon { font-size: 2rem; color: var(--accent); margin-bottom: 16px; }
.advantage-card h3 { margin-bottom: 12px; color: var(--primary); }
.advantage-card p { color: var(--text-light); }

.categories-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.category-card { display: block; padding: 32px; background: #fff; border-radius: var(--radius); text-align: center; box-shadow: var(--shadow); transition: all 0.2s; border: 2px solid transparent; }
.category-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.category-icon { font-size: 3rem; margin-bottom: 16px; }
.category-card h3 { margin-bottom: 8px; color: var(--primary); }
.category-card p { font-size: 0.875rem; color: var(--text-light); }

.cta-box { background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%); padding: 60px 40px; border-radius: var(--radius); text-align: center; color: #fff; }
.cta-box h2 { margin-bottom: 16px; }
.cta-box p { margin-bottom: 24px; opacity: 0.9; }

.page-header { background: var(--primary); color: #fff; padding: 60px 0; text-align: center; }
.page-header h1 { font-size: 2.5rem; }
.page-desc { margin-top: 16px; opacity: 0.9; }
.breadcrumb { font-size: 0.875rem; }
.breadcrumb a { color: #fff; opacity: 0.8; }
.breadcrumb span { opacity: 1; }

.filter-bar { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 32px; justify-content: center; }
.filter-btn { padding: 8px 20px; border: 2px solid var(--border); background: #fff; border-radius: 30px; cursor: pointer; transition: all 0.2s; font-weight: 500; }
.filter-btn:hover, .filter-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.product-gallery { background: #fff; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.product-main-image { aspect-ratio: 1; background: var(--bg); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; }
.product-main-image img { max-height: 400px; object-fit: contain; }
.product-info h1 { margin-bottom: 16px; color: var(--primary); }
.product-category-badge { display: inline-block; background: var(--accent); color: #fff; padding: 4px 12px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; margin-bottom: 16px; }
.product-description { margin-bottom: 24px; color: var(--text-light); }
.product-features, .product-specs { margin-bottom: 24px; }
.product-features h3, .product-specs h3 { font-size: 1.125rem; margin-bottom: 12px; color: var(--primary); }
.product-features ul { padding-left: 20px; }
.product-features li { margin-bottom: 8px; }
.product-specs table { width: 100%; border-collapse: collapse; }
.product-specs td { padding: 8px 12px; border-bottom: 1px solid var(--border); }
.product-specs td:first-child { font-weight: 500; width: 40%; }
.product-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 32px; }

.content-list { max-width: 800px; }
.content-card { background: #fff; padding: 24px; border-radius: var(--radius); margin-bottom: 24px; box-shadow: var(--shadow); }
.content-card h2 { margin-bottom: 12px; }
.content-card h2 a { color: var(--primary); }
.content-single { max-width: 800px; background: #fff; padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow); }

.site-footer { background: var(--primary); color: #fff; padding: 60px 0 20px; margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; margin-bottom: 40px; }
.footer-col h3 { font-size: 1.125rem; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col a { color: rgba(255,255,255,0.8); }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.875rem; opacity: 0.7; }

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .nav-list { display: none; }
  .menu-toggle { display: flex; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}