*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #1a56db; --primary-dark: #1140a0; --accent: #f59e0b;
    --dark: #1e293b; --gray: #64748b; --light: #f1f5f9; --white: #fff;
    --success: #16a34a; --border: #e2e8f0; --radius: 10px;
    --shadow: 0 2px 8px rgba(0,0,0,.08); --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
}
body { font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; color: var(--dark); line-height: 1.6; background: var(--white); }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.btn { display: inline-block; padding: 10px 24px; border-radius: var(--radius); font-weight: 600; font-size: 15px; cursor: pointer; border: 2px solid transparent; transition: .2s; text-align: center; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-lg { padding: 14px 36px; font-size: 17px; }
.btn-block { width: 100%; display: block; }
.btn-text { background: none; border: none; color: var(--gray); padding: 8px; }
.btn-text:hover { color: var(--primary); }
.header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { font-size: 24px; font-weight: 800; color: var(--primary); }
.logo span { color: var(--accent); }
.nav { display: flex; gap: 28px; }
.nav a { font-weight: 500; color: var(--dark); padding: 6px 0; border-bottom: 2px solid transparent; transition: .2s; }
.nav a:hover, .nav a.active { color: var(--primary); border-bottom-color: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--dark); }
.hero { background: linear-gradient(135deg, #1a56db, #2563eb, #3b82f6); color: #fff; padding: 80px 0 100px; text-align: center; }
.hero h1 { font-size: 42px; margin-bottom: 16px; font-weight: 800; }
.hero p { font-size: 19px; opacity: .9; max-width: 650px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 60px; }
.hero .btn-outline { color: #fff; border-color: rgba(255,255,255,.6); }
.hero .btn-outline:hover { background: #fff; color: var(--primary); border-color: #fff; }
.hero-stats { display: flex; gap: 50px; justify-content: center; flex-wrap: wrap; }
.stat strong { display: block; font-size: 32px; font-weight: 800; }
.stat span { font-size: 14px; opacity: .85; }
.section { padding: 70px 0; }
.section-alt { background: var(--light); }
.section-title { text-align: center; font-size: 30px; margin-bottom: 45px; font-weight: 700; }
.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.category-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; text-align: center; transition: .2s; box-shadow: var(--shadow); }
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.cat-icon { font-size: 40px; margin-bottom: 12px; }
.category-card h3 { font-size: 18px; margin-bottom: 6px; }
.category-card p { color: var(--gray); font-size: 14px; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.product-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: .2s; box-shadow: var(--shadow); }
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.product-img { height: 180px; background: var(--light); display: flex; align-items: center; justify-content: center; font-size: 50px; }
.product-body { padding: 16px; }
.product-body h3 { font-size: 16px; margin-bottom: 6px; }
.product-price { color: var(--primary); font-weight: 700; font-size: 18px; }
.product-price small { color: var(--gray); font-weight: 400; font-size: 13px; }
.product-moq { color: var(--gray); font-size: 13px; margin: 6px 0; }
.product-supp { font-size: 13px; color: var(--gray); margin-bottom: 10px; }
.product-card .btn { padding: 7px 16px; font-size: 13px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { text-align: center; padding: 30px 20px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); }
.feature-icon { font-size: 40px; margin-bottom: 14px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { color: var(--gray); font-size: 14px; }
.cta { background: linear-gradient(135deg, var(--dark), #334155); color: #fff; text-align: center; padding: 70px 0; }
.cta h2 { font-size: 30px; margin-bottom: 12px; }
.cta p { font-size: 17px; opacity: .85; margin-bottom: 28px; }
.footer { background: #0f172a; color: #cbd5e1; padding: 50px 0 0; }
.footer-inner { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; padding-bottom: 40px; }
.footer-col h4 { color: #fff; margin-bottom: 16px; font-size: 16px; }
.footer-col p { font-size: 14px; margin-bottom: 6px; line-height: 1.5; }
.footer-col a { display: block; font-size: 14px; margin-bottom: 8px; color: #94a3b8; transition: .2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; padding: 20px 0; text-align: center; font-size: 14px; color: #64748b; }
.page-header { background: linear-gradient(135deg, #1a56db, #3b82f6); color: #fff; padding: 50px 0; text-align: center; }
.page-header h1 { font-size: 34px; margin-bottom: 8px; }
.page-header p { font-size: 17px; opacity: .9; }
.catalog-layout { display: grid; grid-template-columns: 250px 1fr; gap: 30px; }
.filter-sidebar { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; height: fit-content; }
.filter-sidebar h3 { margin-bottom: 20px; font-size: 20px; }
.filter-group { margin-bottom: 24px; }
.filter-group h4 { font-size: 15px; margin-bottom: 10px; }
.filter-group label { display: flex; align-items: center; gap: 8px; font-size: 14px; margin-bottom: 8px; cursor: pointer; }
.price-input, .select-input, .search-input { padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; width: 100%; }
.catalog-toolbar { display: flex; gap: 16px; margin-bottom: 24px; }
.search-input { flex: 1; }
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 30px; }
.pagination button { padding: 8px 14px; border: 1px solid var(--border); border-radius: 6px; background: #fff; cursor: pointer; font-size: 14px; }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:hover:not(.active) { border-color: var(--primary); color: var(--primary); }
.rfq-layout { display: grid; grid-template-columns: 1fr 350px; gap: 40px; }
.rfq-form { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.rfq-form h2 { margin-bottom: 24px; font-size: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 14px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: 6px; font-size: 15px; font-family: inherit; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,.1); }
.rfq-info h3 { font-size: 22px; margin-bottom: 24px; }
.step { display: flex; gap: 16px; margin-bottom: 24px; }
.step-num { width: 36px; height: 36px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
.step strong { display: block; margin-bottom: 4px; }
.step p { font-size: 14px; color: var(--gray); }
.info-box { background: var(--light); border-radius: var(--radius); padding: 20px; margin-top: 30px; }
.info-box h4 { margin-bottom: 12px; }
.info-box ul { padding-left: 20px; }
.info-box li { font-size: 14px; margin-bottom: 6px; color: var(--gray); }
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 999; align-items: center; justify-content: center; }
.modal-overlay.show { display: flex; }
.modal { background: #fff; border-radius: 16px; padding: 40px; text-align: center; max-width: 420px; width: 90%; }
.modal-icon { font-size: 50px; margin-bottom: 16px; }
.modal h2 { margin-bottom: 12px; }
.modal p { color: var(--gray); margin-bottom: 24px; }
.supplier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.supplier-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); transition: .2s; }
.supplier-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.supplier-card h3 { font-size: 18px; margin-bottom: 8px; }
.supplier-badge { display: inline-block; background: #dcfce7; color: var(--success); font-size: 12px; padding: 3px 10px; border-radius: 20px; margin-bottom: 12px; font-weight: 600; }
.supplier-meta { font-size: 14px; color: var(--gray); margin-bottom: 6px; }
.supplier-rating { color: var(--accent); font-size: 16px; margin: 8px 0; }
.supplier-tags { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0; }
.supplier-tags span { background: var(--light); font-size: 12px; padding: 3px 10px; border-radius: 4px; color: var(--gray); }
.about-content { max-width: 800px; margin: 0 auto; }
.about-content h2 { font-size: 28px; margin-bottom: 16px; }
.about-content p { font-size: 17px; color: var(--gray); margin-bottom: 16px; }
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.big-stat { text-align: center; padding: 30px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); }
.big-stat strong { display: block; font-size: 36px; color: var(--primary); }
.big-stat span { color: var(--gray); font-size: 15px; }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-icon { font-size: 28px; width: 50px; height: 50px; display: flex; align-items: center; justify-content: center; background: var(--light); border-radius: 50%; flex-shrink: 0; }
.contact-item strong { display: block; margin-bottom: 4px; }
.contact-item p { color: var(--gray); font-size: 15px; }
@media (max-width: 980px) {
    .nav { display: none; position: absolute; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 20px; border-bottom: 1px solid var(--border); gap: 0; }
    .nav.open { display: flex; }
    .nav a { padding: 12px 0; border-bottom: 1px solid var(--border); }
    .menu-toggle { display: block; }
    .hero h1 { font-size: 30px; }
    .hero p { font-size: 16px; }
    .hero-stats { gap: 30px; }
    .stat strong { font-size: 24px; }
    .category-grid, .product-grid, .feature-grid, .supplier-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: repeat(2, 1fr); }
    .catalog-layout { grid-template-columns: 1fr; }
    .rfq-layout, .contact-layout { grid-template-columns: 1fr; }
    .stats-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 580px) {
    .category-grid, .product-grid, .feature-grid, .supplier-grid, .stats-row, .footer-inner { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
    .section { padding: 50px 0; }
}