/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', Arial, sans-serif; color: #333; line-height: 1.6; background: #fff; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { background: #1a3a5c; color: #fff; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 10px rgba(0,0,0,0.2); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 0 20px; max-width: 1200px; margin: 0 auto; height: 70px; }
.logo { font-size: 1.4rem; font-weight: 700; color: #fff; letter-spacing: 0.5px; }
.logo span { color: #f4c430; }
.nav-links { display: flex; gap: 30px; list-style: none; }
.nav-links a { color: rgba(255,255,255,0.9); font-size: 0.95rem; transition: color 0.2s; padding: 5px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a.active { color: #f4c430; border-bottom-color: #f4c430; }
.header-contact { display: flex; align-items: center; gap: 15px; }
.btn-inquiry { background: #f4c430; color: #1a3a5c; padding: 8px 20px; border-radius: 4px; font-weight: 600; font-size: 0.9rem; transition: background 0.2s; }
.btn-inquiry:hover { background: #ffd700; }

/* Mobile menu */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.hamburger span { display: block; width: 25px; height: 2px; background: #fff; border-radius: 2px; }

/* Hero Banner */
.hero { background: linear-gradient(135deg, #1a3a5c 0%, #2d6a9f 100%); color: #fff; text-align: center; padding: 100px 20px; }
.hero h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 20px; line-height: 1.2; }
.hero h1 span { color: #f4c430; }
.hero p { font-size: 1.2rem; max-width: 700px; margin: 0 auto 40px; color: rgba(255,255,255,0.85); }
.hero-buttons { display: flex; gap: 15px; justify-content: center; flex-wrap: wrap; }
.btn-primary { background: #f4c430; color: #1a3a5c; padding: 14px 35px; border-radius: 5px; font-weight: 700; font-size: 1rem; transition: transform 0.2s, background 0.2s; }
.btn-primary:hover { background: #ffd700; transform: translateY(-2px); }
.btn-secondary { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.7); padding: 14px 35px; border-radius: 5px; font-weight: 600; font-size: 1rem; transition: border-color 0.2s; }
.btn-secondary:hover { border-color: #fff; }

/* Features bar */
.features-bar { background: #f8f9fa; border-bottom: 1px solid #e9ecef; padding: 25px 0; }
.features-bar .container { display: flex; justify-content: center; gap: 50px; flex-wrap: wrap; }
.feature-item { display: flex; align-items: center; gap: 10px; font-size: 0.95rem; }
.feature-icon { width: 40px; height: 40px; background: #1a3a5c; color: #f4c430; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }

/* Section */
.section { padding: 70px 0; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 2rem; font-weight: 700; color: #1a3a5c; margin-bottom: 12px; }
.section-title p { color: #666; font-size: 1.05rem; max-width: 650px; margin: 0 auto; }
.section-title .title-line { width: 60px; height: 4px; background: #f4c430; margin: 12px auto 0; border-radius: 2px; }

/* Product Grid */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 25px; }
.product-card { border: 1px solid #e9ecef; border-radius: 8px; overflow: hidden; transition: transform 0.2s, box-shadow 0.2s; background: #fff; }
.product-card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,0.12); }
.product-card-img { width: 100%; height: 220px; object-fit: cover; background: #f5f5f5; }
.product-card-body { padding: 18px; }
.product-card-title { font-size: 0.95rem; font-weight: 600; color: #1a3a5c; margin-bottom: 8px; line-height: 1.4; }
.product-card-cat { font-size: 0.8rem; color: #888; margin-bottom: 12px; }
.product-card-btn { display: inline-block; background: #1a3a5c; color: #fff; padding: 7px 18px; border-radius: 4px; font-size: 0.85rem; transition: background 0.2s; }
.product-card-btn:hover { background: #2d6a9f; }

/* Category nav */
.category-nav { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 35px; }
.category-btn { padding: 8px 20px; border: 2px solid #1a3a5c; border-radius: 25px; font-size: 0.9rem; color: #1a3a5c; cursor: pointer; transition: all 0.2s; background: #fff; }
.category-btn.active, .category-btn:hover { background: #1a3a5c; color: #fff; }

/* Product Detail */
.product-detail { padding: 60px 0; }
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.main-img { width: 100%; border-radius: 8px; object-fit: cover; height: 400px; background: #f5f5f5; }
.thumb-row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.thumb { width: 80px; height: 80px; object-fit: cover; border-radius: 4px; cursor: pointer; border: 2px solid transparent; transition: border-color 0.2s; }
.thumb:hover, .thumb.active { border-color: #1a3a5c; }
.product-info h1 { font-size: 1.8rem; color: #1a3a5c; margin-bottom: 15px; line-height: 1.3; }
.product-badge { display: inline-block; background: #e8f4fd; color: #1a3a5c; padding: 4px 12px; border-radius: 3px; font-size: 0.85rem; margin-bottom: 20px; }
.product-desc { color: #555; line-height: 1.8; margin-bottom: 25px; font-size: 0.95rem; }
.product-features { list-style: none; margin-bottom: 30px; }
.product-features li { padding: 6px 0; border-bottom: 1px solid #f0f0f0; font-size: 0.9rem; display: flex; align-items: flex-start; gap: 8px; }
.product-features li::before { content: "✓"; color: #2d9c4c; font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.inquiry-box { background: #f8f9fa; padding: 25px; border-radius: 8px; border: 1px solid #e9ecef; }
.inquiry-box h3 { font-size: 1.1rem; margin-bottom: 15px; color: #1a3a5c; }
.inquiry-form input, .inquiry-form textarea { width: 100%; border: 1px solid #ddd; border-radius: 4px; padding: 10px 14px; font-size: 0.9rem; margin-bottom: 12px; font-family: inherit; transition: border-color 0.2s; }
.inquiry-form input:focus, .inquiry-form textarea:focus { outline: none; border-color: #1a3a5c; }
.inquiry-form textarea { height: 100px; resize: vertical; }
.inquiry-form button { width: 100%; background: #f4c430; color: #1a3a5c; border: none; padding: 12px; border-radius: 4px; font-weight: 700; font-size: 1rem; cursor: pointer; transition: background 0.2s; }
.inquiry-form button:hover { background: #ffd700; }

/* SEO Keywords Box (hidden for users, visible to crawlers) */
.seo-related-keywords { padding: 20px 0; border-top: 1px solid #f0f0f0; }
.seo-related-keywords h4 { font-size: 0.85rem; color: #888; margin-bottom: 8px; }
.keyword-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.keyword-tag { background: #f0f4f8; color: #555; font-size: 0.8rem; padding: 4px 10px; border-radius: 20px; }
.keyword-tag a { color: #2d6a9f; }

/* Related Products */
.related-products { padding: 50px 0; background: #f8f9fa; }
.related-products h2 { font-size: 1.5rem; color: #1a3a5c; margin-bottom: 25px; }

/* About section */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 2rem; color: #1a3a5c; margin-bottom: 20px; }
.about-text p { color: #555; line-height: 1.8; margin-bottom: 15px; }
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 30px; }
.stat-item { text-align: center; background: #f8f9fa; padding: 25px 15px; border-radius: 8px; }
.stat-number { font-size: 2.2rem; font-weight: 800; color: #1a3a5c; }
.stat-label { font-size: 0.85rem; color: #666; margin-top: 5px; }
.about-image { width: 100%; height: 400px; object-fit: cover; border-radius: 10px; background: #e9ecef; }

/* News / Blog */
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; }
.news-card { border: 1px solid #e9ecef; border-radius: 8px; overflow: hidden; transition: box-shadow 0.2s; }
.news-card:hover { box-shadow: 0 8px 25px rgba(0,0,0,0.1); }
.news-card-img { width: 100%; height: 200px; object-fit: cover; background: #f5f5f5; }
.news-card-body { padding: 20px; }
.news-card-date { font-size: 0.8rem; color: #999; margin-bottom: 8px; }
.news-card-title { font-size: 1rem; font-weight: 600; color: #1a3a5c; margin-bottom: 10px; line-height: 1.4; }
.news-card-excerpt { font-size: 0.88rem; color: #666; line-height: 1.6; margin-bottom: 15px; }
.news-card-link { font-size: 0.88rem; color: #2d6a9f; font-weight: 600; }
.news-card-link:hover { text-decoration: underline; }

/* Contact */
.contact-section { background: #1a3a5c; color: #fff; padding: 70px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h2 { font-size: 2rem; margin-bottom: 20px; }
.contact-info p { color: rgba(255,255,255,0.8); margin-bottom: 30px; line-height: 1.8; }
.contact-items { list-style: none; }
.contact-items li { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.1); font-size: 0.95rem; color: rgba(255,255,255,0.85); }
.contact-items .icon { width: 36px; height: 36px; background: rgba(244,196,48,0.2); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1rem; flex-shrink: 0; }
.contact-form-box { background: #fff; border-radius: 10px; padding: 35px; }
.contact-form-box h3 { color: #1a3a5c; font-size: 1.3rem; margin-bottom: 20px; }
.contact-form input, .contact-form textarea, .contact-form select { width: 100%; border: 1px solid #ddd; border-radius: 4px; padding: 11px 14px; font-size: 0.9rem; margin-bottom: 14px; font-family: inherit; color: #333; }
.contact-form textarea { height: 120px; resize: vertical; }
.contact-form button { width: 100%; background: #1a3a5c; color: #fff; border: none; padding: 13px; border-radius: 4px; font-weight: 700; font-size: 1rem; cursor: pointer; transition: background 0.2s; }
.contact-form button:hover { background: #2d6a9f; }

/* Footer */
.site-footer { background: #111; color: rgba(255,255,255,0.7); padding: 50px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-about .logo { margin-bottom: 15px; font-size: 1.2rem; }
.footer-about p { font-size: 0.88rem; line-height: 1.7; color: rgba(255,255,255,0.6); }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 15px; font-weight: 600; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.88rem; color: rgba(255,255,255,0.6); transition: color 0.2s; }
.footer-col ul li a:hover { color: #f4c430; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; display: flex; justify-content: space-between; align-items: center; font-size: 0.83rem; color: rgba(255,255,255,0.4); flex-wrap: wrap; gap: 10px; }

/* WhatsApp Float */
.whatsapp-float { position: fixed; bottom: 30px; right: 30px; background: #25d366; color: #fff; width: 55px; height: 55px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; box-shadow: 0 4px 15px rgba(37,211,102,0.4); z-index: 999; transition: transform 0.2s; text-decoration: none; }
.whatsapp-float:hover { transform: scale(1.1); }

/* Page header */
.page-header { background: linear-gradient(135deg, #1a3a5c, #2d6a9f); color: #fff; text-align: center; padding: 60px 20px; }
.page-header h1 { font-size: 2.2rem; font-weight: 700; margin-bottom: 10px; }
.page-header .breadcrumb { font-size: 0.9rem; color: rgba(255,255,255,0.7); }
.page-header .breadcrumb a { color: rgba(255,255,255,0.8); }

/* Breadcrumbs */
.breadcrumbs { padding: 12px 0; font-size: 0.85rem; color: #888; }
.breadcrumbs a { color: #2d6a9f; }
.breadcrumbs span { margin: 0 6px; }

/* News detail */
.news-detail { max-width: 800px; margin: 0 auto; padding: 50px 20px; }
.news-detail h1 { font-size: 2rem; color: #1a3a5c; margin-bottom: 15px; }
.news-detail .meta { color: #999; font-size: 0.88rem; margin-bottom: 30px; border-bottom: 1px solid #eee; padding-bottom: 20px; }
.news-detail .content { line-height: 1.9; color: #444; font-size: 0.95rem; }
.news-detail .content h2, .news-detail .content h3 { color: #1a3a5c; margin: 25px 0 10px; }
.news-detail .content p { margin-bottom: 15px; }
.news-detail .content ul, .news-detail .content ol { margin-bottom: 15px; padding-left: 25px; }
.news-detail .content li { margin-bottom: 8px; }

/* Responsive */
@media (max-width: 900px) {
  .product-detail-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 2rem; }
}
@media (max-width: 600px) {
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: #1a3a5c; padding: 20px; gap: 15px; }
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.6rem; }
  .features-bar .container { gap: 20px; }
}