*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { --color-primary: #2b4c7e; --color-primary-dark: #1a3357; --color-text: #333; --color-bg: #fff; --color-gray-100: #f5f5f5; --color-gray-200: #e5e5e5; --color-gray-300: #ccc; --color-gray-600: #666; --max-width: 1200px; --gap: 1rem; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: var(--color-text); background: var(--color-bg); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gap); }

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 { line-height: 1.3; margin-bottom: 0.5em; }

.main-nav { background: var(--color-primary); color: #fff; padding: 0.75rem 0; }
.main-nav .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--gap); }
.main-nav .logo { color: #fff; font-size: 1.25rem; font-weight: 700; }
.main-nav .logo:hover { text-decoration: none; }
.nav-links { list-style: none; display: flex; gap: 1.5rem; }
.nav-links a { color: #fff; }
.mobile-menu-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

.site-footer { background: var(--color-gray-100); padding: 2rem 0; margin-top: auto; text-align: center; color: var(--color-gray-600); }

.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.product-card { border: 1px solid var(--color-gray-200); border-radius: 8px; padding: 1.5rem; transition: box-shadow 0.2s; }
.product-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.product-card h2, .product-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.price { font-weight: 700; font-size: 1.25rem; color: var(--color-primary); }
.compare-price { text-decoration: line-through; color: var(--color-gray-600); margin-left: 0.5rem; font-size: 0.9rem; }
.old-price { text-decoration: line-through; color: var(--color-gray-600); }

.breadcrumbs { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 1rem 0; font-size: 0.9rem; }
.breadcrumbs li:not(:last-child)::after { content: '/'; margin-left: 0.5rem; color: var(--color-gray-300); }
.breadcrumbs a { color: var(--color-gray-600); }
.breadcrumbs [aria-current="page"] { color: var(--color-text); font-weight: 600; }

.btn { display: inline-block; padding: 0.75rem 1.5rem; border-radius: 6px; font-weight: 600; cursor: pointer; border: none; transition: background 0.2s; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); text-decoration: none; }

.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.blog-card { border: 1px solid var(--color-gray-200); border-radius: 8px; padding: 1.5rem; }
.blog-card h2, .blog-card h3 { font-size: 1.2rem; }

.category-desc-short, .category-desc-long { margin: 1rem 0; line-height: 1.8; }
.category-desc-long { font-size: 0.95rem; color: var(--color-gray-600); border-top: 1px solid var(--color-gray-200); padding-top: 2rem; margin-top: 2rem; }

.pagination { display: flex; gap: 0.5rem; justify-content: center; padding: 2rem 0; }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-toggle { display: block; }
    .product-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .blog-grid { grid-template-columns: 1fr; }
    h1 { font-size: 1.5rem; }
    .container { padding: 0 0.75rem; }
}
@media (max-width: 480px) {
    .product-grid { grid-template-columns: 1fr; }
}