/* ============================================
   HNBATTER B2B Professional Stylesheet
   Based on nanoecig architecture patterns
   B2B Battery Supplier - Strong SEO Focus
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #1a365d;
  --primary-light: #2a4a7f;
  --primary-dark: #0f2340;
  --accent: #d97706;
  --accent-light: #f59e0b;
  --accent-dark: #b45309;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --text: #1f2937;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--gray-900); }
h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
p { margin-bottom: 1rem; color: var(--text-light); }
.section-title { text-align: center; margin-bottom: 3rem; }
.section-title h2 { position: relative; display: inline-block; }
.section-title h2::after {
  content: ""; display: block; width: 60px; height: 3px;
  background: var(--accent); margin: 12px auto 0; border-radius: 2px;
}
.section-title p { color: var(--gray-500); margin-top: 8px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: var(--white); border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 32px;
}
.logo a { display: flex; flex-direction: column; align-items: flex-start; }
.logo-text {
  font-size: 1.5rem; font-weight: 800; color: var(--primary);
  letter-spacing: -0.02em;
}
.logo-tag { font-size: 0.7rem; color: var(--gray-400); text-transform: uppercase; letter-spacing: 0.1em; }

/* Navigation */
.main-nav ul { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  padding: 8px 16px; font-size: 0.9rem; font-weight: 500;
  color: var(--gray-600); border-radius: 6px; transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); background: var(--gray-50); }
.btn-nav-inquiry {
  background: var(--accent) !important; color: var(--white) !important;
  padding: 10px 24px !important; border-radius: 6px !important;
  font-weight: 600 !important;
}
.btn-nav-inquiry:hover { background: var(--accent-dark) !important; color: var(--white) !important; }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: 16px; }
.lang-switcher { display: flex; align-items: center; gap: 6px; }
.lang-link { font-size: 0.8rem; color: var(--gray-400); font-weight: 500; padding: 2px 4px; }
.lang-link.active, .lang-link:hover { color: var(--primary); }
.lang-sep { color: var(--gray-300); font-size: 0.75rem; }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none; flex-direction: column; gap: 4px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.mobile-menu-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--gray-700); border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 32px; font-size: 0.95rem; font-weight: 600;
  border-radius: 6px; border: 2px solid transparent;
  cursor: pointer; transition: all var(--transition);
  text-decoration: none; font-family: var(--font);
}
.btn-primary {
  background: var(--accent); color: var(--white); border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: var(--white); }
.btn-outline {
  background: transparent; color: var(--white); border-color: var(--white);
}
.btn-outline:hover { background: var(--white); color: var(--primary); }
.btn-secondary {
  background: var(--primary); color: var(--white); border-color: var(--primary);
}
.btn-secondary:hover { background: var(--primary-light); border-color: var(--primary-light); color: var(--white); }
.btn-sm { padding: 8px 20px; font-size: 0.85rem; }
.btn-lg { padding: 16px 40px; font-size: 1.05rem; }

/* ---------- Hero Banner ---------- */
.hero-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  padding: 100px 0 80px; position: relative; overflow: hidden;
}
.hero-banner::before {
  content: ""; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(217,119,6,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-content { max-width: 720px; position: relative; z-index: 1; }
.hero-title {
  font-size: 3rem; font-weight: 800; color: var(--white);
  line-height: 1.15; margin-bottom: 20px;
}
.hero-subtitle {
  font-size: 1.15rem; color: rgba(255,255,255,0.8);
  line-height: 1.7; margin-bottom: 36px; max-width: 600px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- Trust Badges ---------- */
.trust-badges {
  background: var(--white); border-bottom: 1px solid var(--border);
  padding: 32px 0;
}
.badges-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.badge-item { display: flex; align-items: center; gap: 16px; padding: 16px; }
.badge-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--gray-50); display: flex; align-items: center;
  justify-content: center; font-size: 1.3rem; flex-shrink: 0;
}
.badge-text { display: flex; flex-direction: column; }
.badge-text strong { font-size: 0.9rem; color: var(--gray-800); }
.badge-text span { font-size: 0.8rem; color: var(--gray-400); margin-top: 2px; }

/* ---------- Page Banner (Subpages) ---------- */
.page-banner {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 60px 0 50px; text-align: center;
}
.page-banner h1 { color: var(--white); font-size: 2.2rem; margin-bottom: 8px; }
.page-banner p { color: rgba(255,255,255,0.7); font-size: 1.05rem; margin: 0; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--gray-50); }

/* ---------- Product Filter Bar ---------- */
.filter-bar {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px 24px; margin-bottom: 28px;
  box-shadow: var(--shadow);
}
.filter-form {
  display: flex; flex-wrap: wrap; align-items: flex-end; gap: 16px;
}
.filter-group { display: flex; flex-direction: column; gap: 4px; min-width: 160px; }
.filter-label {
  font-size: 0.78rem; font-weight: 600; color: var(--gray-500);
  text-transform: uppercase; letter-spacing: 0.03em;
}
.filter-select, .filter-input {
  padding: 10px 12px; font-size: 0.9rem; font-family: var(--font);
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--white); color: var(--text);
  transition: all var(--transition); min-height: 42px;
}
.filter-select:hover, .filter-input:hover { border-color: var(--gray-400); }
.filter-select:focus, .filter-input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,54,93,0.08);
}
.filter-search { flex: 1; min-width: 200px; }
.search-box {
  display: flex; gap: 0; position: relative;
}
.search-box .filter-input {
  flex: 1; border-right: none; border-radius: 6px 0 0 6px;
}
.search-btn {
  display: flex; align-items: center; justify-content: center;
  padding: 0 14px; background: var(--primary); color: var(--white);
  border: 1px solid var(--primary); border-radius: 0 6px 6px 0;
  cursor: pointer; transition: background var(--transition);
  min-width: 44px;
}
.search-btn:hover { background: var(--primary-light); }
.filter-clear {
  position: absolute; right: 54px; top: 50%; transform: translateY(-50%);
  color: var(--gray-400); padding: 6px; display: flex;
  transition: color var(--transition);
}
.filter-clear:hover { color: var(--accent); }
.filter-results {
  display: flex; align-items: center; padding: 4px 0;
  margin-left: auto;
}
.results-count { font-size: 0.85rem; color: var(--gray-500); white-space: nowrap; }
.results-count strong { color: var(--primary); font-weight: 700; }

/* ---------- Pagination ---------- */
.pagination-section { margin-top: 40px; }
.pagination-wrap {
  display: flex; align-items: center; justify-content: center;
  gap: 20px; flex-wrap: wrap;
}
.pagination-info { font-size: 0.85rem; color: var(--gray-500); }
.pagination-info strong { color: var(--primary); }
.pagination {
  display: flex; align-items: center; gap: 4px; list-style: none;
  margin: 0; padding: 0;
}
.page-item { margin: 0; }
.page-item.dots .page-link {
  border: none; color: var(--gray-400); cursor: default;
  padding: 8px 6px; background: none;
}
.page-link {
  display: flex; align-items: center; justify-content: center;
  min-width: 38px; height: 38px;
  padding: 0 10px; font-size: 0.85rem; font-weight: 500;
  color: var(--gray-600); background: var(--white);
  border: 1px solid var(--border); border-radius: 6px;
  transition: all var(--transition); text-decoration: none;
}
.page-link:hover { border-color: var(--primary); color: var(--primary); z-index: 1; }
.page-item.active .page-link {
  background: var(--primary); border-color: var(--primary);
  color: var(--white); font-weight: 600; z-index: 2;
}
.page-item.disabled .page-link {
  color: var(--gray-300); background: var(--gray-50);
  border-color: var(--border); cursor: not-allowed;
}

.product-card-image-link { display: block; text-decoration: none; }

/* ---------- Product Grid (B2B 4-column) ---------- */
.product-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.product-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
  display: flex; flex-direction: column;
}
.product-card:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.1); transform: translateY(-4px);
  border-color: var(--primary-light);
}
.product-card-image {
  position: relative; overflow: hidden; background: var(--gray-50);
  padding-top: 75%; /* 4:3 aspect ratio */
}
.product-card-image img {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.product-card:hover .product-card-image img { transform: scale(1.05); }
.product-card-body {
  padding: 20px; flex: 1;
  display: flex; flex-direction: column;
}
.product-card-body h3 {
  font-size: 1rem; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; min-height: 2.6em;
}
.product-card-body h3 a { color: var(--gray-800); }
.product-card-body h3 a:hover { color: var(--accent); }
.product-card-body p {
  font-size: 0.85rem; color: var(--gray-500); margin: 0 0 12px;
  line-height: 1.6; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-meta {
  display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px;
}
.product-meta span {
  font-size: 0.72rem; padding: 2px 8px; border-radius: 4px;
  background: var(--gray-50); color: var(--gray-600);
  border: 1px solid var(--border);
}
.product-card-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 12px; border-top: 1px solid var(--border);
  margin-top: auto;
}
.product-card-footer .btn-sm { padding: 6px 16px; font-size: 0.8rem; }
.product-card-footer .inquiry-link {
  font-size: 0.8rem; color: var(--accent); font-weight: 600;
  white-space: nowrap;
}
.product-card-footer .inquiry-link:hover { color: var(--accent-dark); }

/* ---------- Empty State ---------- */
.empty-state { text-align: center; padding: 80px 20px; max-width: 500px; margin: 0 auto; }
.empty-icon { font-size: 3.5rem; margin-bottom: 20px; opacity: 0.6; }
.empty-state h3 { font-size: 1.3rem; color: var(--gray-700); margin-bottom: 12px; }
.empty-state p { color: var(--gray-500); margin-bottom: 24px; line-height: 1.7; }

/* ---------- Product Detail ---------- */
/* ---------- Product Detail ---------- */
.product-detail-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.product-detail-images { position: sticky; top: 20px; }

.product-main-image {
  background: var(--gray-50); border-radius: var(--radius-lg);
  padding: 40px; display: flex; align-items: center;
  justify-content: center; aspect-ratio: 1;
  border: 1px solid var(--border);
}
.product-main-image img { max-width: 80%; max-height: 80%; object-fit: contain; }

.product-detail-info { padding-top: 8px; }
.product-detail-meta-top { margin-bottom: 12px; }
.product-cat-badge {
  display: inline-block; padding: 4px 12px; font-size: 0.75rem; font-weight: 600;
  color: var(--primary); background: rgba(26,54,93,0.08); border-radius: 4px;
}
.product-detail-title { font-size: 1.65rem; margin-bottom: 16px; line-height: 1.3; }

.product-detail-desc { margin-bottom: 24px; }
.product-detail-desc p { line-height: 1.8; color: var(--gray-600); font-size: 0.95rem; }

.product-highlights { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.highlight-item {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px; background: var(--gray-50);
  border-radius: 8px; border: 1px solid var(--border);
}
.highlight-icon { font-size: 1.2rem; flex-shrink: 0; }
.highlight-label { display: block; font-size: 0.78rem; color: var(--gray-400); text-transform: uppercase; letter-spacing: 0.03em; }
.highlight-value { display: block; font-size: 0.92rem; font-weight: 600; color: var(--gray-700); }

.product-detail-actions { display: flex; gap: 12px; margin: 28px 0; flex-wrap: wrap; }
.product-detail-actions .btn-lg { padding: 14px 32px; font-size: 1rem; }

/* Product Detail Sections */
.product-detail-section { margin-top: 48px; padding-top: 40px; border-top: 1px solid var(--border); }
.section-title-lg { font-size: 1.35rem; margin-bottom: 24px; color: var(--gray-800); }

/* Product Tabs */
.product-tabs { margin-top: 40px; }
.product-tabs-nav {
  display: flex; gap: 0; border-bottom: 2px solid var(--border);
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.product-tabs-nav::-webkit-scrollbar { display: none; }
.product-tab-btn {
  padding: 14px 24px; font-size: 0.92rem; font-weight: 600; color: var(--gray-500);
  background: none; border: none; cursor: pointer; white-space: nowrap;
  border-bottom: 2px solid transparent; margin-bottom: -2px;
  transition: color var(--transition), border-color var(--transition);
}
.product-tab-btn:hover { color: var(--gray-700); }
.product-tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.product-tab-content { display: none; padding-top: 28px; }
.product-tab-content.active { display: block; }
.product-tab-intro { color: var(--gray-500); margin-bottom: 24px; font-size: 0.92rem; }

.product-detail-content { line-height: 1.9; color: var(--gray-700); }
.product-detail-content p { margin-bottom: 14px; }
.product-detail-content h3 { font-size: 1.1rem; margin: 24px 0 12px; }
.product-detail-content ul, .product-detail-content ol { padding-left: 24px; margin-bottom: 14px; }

/* Spec Table */
.specs-table-wrap { max-width: 700px; }
.specs-table { width: 100%; border-collapse: collapse; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
.specs-table td {
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.specs-table td:first-child { font-weight: 600; color: var(--gray-700); width: 35%; background: var(--gray-50); }
.specs-table tr:last-child td { border-bottom: none; }
.specs-table tr:hover td { background: var(--gray-50); }

/* Related Products */
.related-products-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* Product CTA */
.product-cta-section {
  margin-top: 48px; background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-lg); padding: 48px; text-align: center; color: var(--white);
}
.product-cta-section h2 { font-size: 1.4rem; margin-bottom: 12px; }
.product-cta-section p { color: rgba(255,255,255,0.7); margin-bottom: 24px; font-size: 0.95rem; }

/* Old product styles kept for compatibility */
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.product-info h1 { margin-bottom: 16px; }
.product-desc { line-height: 1.8; margin-bottom: 24px; }
.product-desc p { color: var(--gray-600); }
.product-actions { display: flex; gap: 16px; margin: 32px 0; }
.product-specs { margin-top: 40px; }
.product-specs h3 { margin-bottom: 16px; }
/* Product Features */
.product-features-html { padding: 8px 0; }
.product-features-html ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.product-features-html ul li { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-sm, 6px); padding: 12px 16px; font-size: 0.88rem; line-height: 1.6; color: var(--gray-700); text-align: left; }
.product-features-html ul li strong { color: var(--primary); display: inline; }
.product-features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.feature-item {
  display: flex; gap: 14px; padding: 18px; background: var(--gray-50);
  border-radius: 8px; border: 1px solid var(--border); align-items: flex-start;
}
.feature-item-icon { font-size: 1.4rem; flex-shrink: 0; }
.feature-item strong { display: block; font-size: 0.92rem; margin-bottom: 4px; color: var(--gray-800); }
.feature-item p { font-size: 0.85rem; color: var(--gray-500); margin: 0; line-height: 1.5; }

/* Section Subtitle */
.section-subtitle { color: var(--gray-500); margin-top: -18px; margin-bottom: 28px; font-size: 0.92rem; }

/* Manufacturing Process Flow */
.process-flow { display: flex; flex-direction: column; gap: 0; max-width: 800px; }
.process-step { display: flex; align-items: flex-start; gap: 20px; position: relative; padding-bottom: 24px; }
.process-step:not(:last-child) { border-left: 2px dashed var(--primary-light); padding-left: 20px; margin-left: 12px; }
.process-step:last-child { padding-left: 20px; margin-left: 12px; }
.process-step-num {
  position: absolute; left: -36px; top: 0;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--primary); color: var(--white); display: flex;
  align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; z-index: 1;
}
.process-step-icon { font-size: 1.6rem; flex-shrink: 0; margin-top: 2px; min-width: 28px; text-align: center; }
.process-step-info { flex: 1; }
.process-step-info h4 { font-size: 0.95rem; margin-bottom: 4px; text-align: left; }
.process-step-info p { font-size: 0.85rem; color: var(--gray-500); margin: 0; line-height: 1.6; text-align: left; }
.process-arrow { display: none; }

/* Lightbox */
.lightbox-overlay {
  display: none; position: fixed; z-index: 9999;
  left: 0; top: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.9); justify-content: center;
  align-items: center; cursor: pointer;
}
.lightbox-image {
  max-width: 90%; max-height: 90%; object-fit: contain;
  border-radius: 4px; box-shadow: 0 0 40px rgba(0,0,0,0.5);
}
.lightbox-close {
  position: absolute; top: 20px; right: 32px;
  color: var(--white); font-size: 2.5rem; font-weight: 300;
  cursor: pointer; z-index: 10000; line-height: 1;
}
.lightbox-close:hover { color: var(--accent); }

.product-image-zoom-hint {
  position: absolute; bottom: 12px; right: 12px;
  background: rgba(0,0,0,0.6); color: var(--white);
  font-size: 0.75rem; padding: 4px 10px; border-radius: 4px;
  opacity: 0; transition: opacity var(--transition);
  pointer-events: none;
}
.product-main-image:hover .product-image-zoom-hint { opacity: 1; }

.breadcrumb { font-size: 0.85rem; color: var(--gray-400); }
.breadcrumb a { color: rgba(255,255,255,0.7); }
.breadcrumb a:hover { color: var(--accent-light); }
.breadcrumb .sep { margin: 0 8px; color: rgba(255,255,255,0.3); }
.breadcrumb span:last-child { color: rgba(255,255,255,0.9); }

/* ---------- CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  padding: 80px 0; text-align: center;
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: ""; position: absolute; top: -50%; left: -20%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(217,119,6,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 {
  color: var(--white); font-size: 2rem; margin-bottom: 16px;
  font-weight: 700; text-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.cta-section p {
  color: rgba(255,255,255,0.75); font-size: 1.1rem;
  max-width: 600px; margin: 0 auto 36px; line-height: 1.7;
}
.cta-section .btn { font-size: 1.1rem; padding: 16px 44px; box-shadow: 0 4px 15px rgba(217,119,6,0.4); }
.cta-section .btn:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(217,119,6,0.5); }

/* ---------- Stats Section ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 32px 16px; }
.stat-number { font-size: 2.5rem; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: 0.9rem; color: var(--gray-500); }

/* ---------- Contact / Inquiry Form ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h2 { margin-bottom: 24px; }
.contact-info p { color: var(--gray-500); line-height: 1.8; margin-bottom: 32px; }
.contact-details { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
  display: flex; align-items: flex-start; gap: 16px;
}
.contact-item .icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--gray-50); display: flex; align-items: center;
  justify-content: center; font-size: 1.1rem; flex-shrink: 0;
}
.contact-item h4 { font-size: 0.95rem; margin-bottom: 2px; }
.contact-item p { font-size: 0.88rem; color: var(--gray-500); margin: 0; }

.inquiry-form {
  background: var(--white); padding: 40px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.inquiry-form h3 { font-size: 1.3rem; margin-bottom: 8px; }
.inquiry-form > p { color: var(--gray-400); margin-bottom: 24px; font-size: 0.9rem; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 0.88rem; font-weight: 500;
  color: var(--gray-700); margin-bottom: 6px;
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; font-size: 0.95rem;
  border: 1px solid var(--border); border-radius: 6px;
  font-family: var(--font); transition: border-color var(--transition);
  background: var(--white); color: var(--text);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,54,93,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.inquiry-form .btn { width: 100%; }

/* ---------- About Page ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-image { background: var(--gray-50); border-radius: var(--radius-lg); aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; font-size: 4rem; border: 1px solid var(--border); }
.about-text h2 { margin-bottom: 20px; }
.about-text p { line-height: 1.8; color: var(--gray-600); }
.about-badges { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 24px; }
.about-badge {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; background: var(--gray-50);
  border-radius: 8px; font-size: 0.9rem; font-weight: 500;
  color: var(--gray-700); border: 1px solid var(--border);
}
.about-badge .badge-icon { font-size: 1.1rem; }

/* Production Capabilities */
.production-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin: 0; }
.production-card {
  padding: 32px; background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); transition: all var(--transition);
}
.production-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); transform: translateY(-2px); }
.production-icon { font-size: 2.2rem; margin-bottom: 16px; }
.production-card h3 { font-size: 1.1rem; margin-bottom: 12px; }
.production-card p { font-size: 0.9rem; color: var(--gray-500); margin: 0; line-height: 1.7; }

/* Cert CTA */
.cert-cta { text-align: center; margin-top: 40px; padding: 32px; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); }
.cert-cta p { color: var(--gray-500); margin-bottom: 16px; }

/* Partner Grid */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.partner-card {
  padding: 24px 16px; background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); text-align: center;
  transition: all var(--transition); display: flex;
  align-items: center; justify-content: center; min-height: 80px;
}
.partner-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.partner-logo { display: flex; align-items: center; justify-content: center; }
.partner-name {
  font-size: 0.95rem; font-weight: 700; color: var(--gray-600);
  letter-spacing: 0.02em; text-transform: uppercase;
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-badges { grid-template-columns: 1fr; }
  .production-grid { grid-template-columns: 1fr; gap: 16px; }
  .production-card { padding: 24px; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .partner-card { min-height: 64px; padding: 16px 12px; }
  .partner-name { font-size: 0.82rem; }
}

@media (max-width: 480px) {
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Blog Post ---------- */
.blog-content { max-width: 800px; margin: 0 auto; }
.blog-date { font-size: 0.85rem; color: var(--gray-400); display: block; margin-bottom: 8px; }

@media (max-width: 768px) {
  .blog-date { font-size: 0.8rem; }
}

/* ---------- Features Grid ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  padding: 32px; background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); text-align: center;
  transition: all var(--transition);
}
.feature-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); transform:translateY(-2px); }
.feature-card .feature-icon {
  width: 56px; height: 56px; margin: 0 auto 16px;
  border-radius: 14px; display: flex; align-items: center;
  justify-content: center; font-size: 1.5rem;
}
.feature-card h3 { margin-bottom: 12px; font-size:1.15rem; }
.feature-card p { font-size: 0.9rem; color: var(--gray-500); margin: 0; line-height: 1.7; }

/* ---------- ODM/OEM ---------- */
.odm-process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 48px 0; }
.odm-features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin: 32px 0; }
.odm-feature {
  padding: 32px; background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); transition: all var(--transition);
}
.odm-feature:hover { box-shadow: var(--shadow-md); transform:translateY(-2px); }
.odm-feature h3 { font-size: 1.15rem; margin-bottom: 8px; }
.odm-feature p { font-size: 0.9rem; color: var(--gray-500); margin: 0; line-height:1.7; }
.odm-feature-icon { font-size: 2rem; margin-bottom: 12px; }

/* ODM Hero */
.odm-hero { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; align-items: start; }
.odm-hero-content h2 { font-size: 1.8rem; margin-bottom: 20px; }
.odm-hero-content > p { line-height: 1.8; color: var(--gray-600); }
.odm-hero-stats { display: flex; gap: 32px; margin-top: 28px; flex-wrap: wrap; }
.odm-hero-stat { text-align: center; }
.hero-stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--primary); line-height: 1.2; }
.hero-stat-label { display: block; font-size: 0.8rem; color: var(--gray-500); margin-top: 4px; }

/* ODM CTA Card */
.odm-cta-card {
  background: var(--primary-dark); border-radius: var(--radius-lg);
  padding: 32px; color: var(--white);
}
.odm-cta-card h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--accent-light); }
.odm-cta-card > p { font-size: 0.9rem; color: rgba(255,255,255,0.7); margin-bottom: 20px; }
.odm-cta-list { list-style: none; padding: 0; margin: 0 0 24px; }
.odm-cta-list li { font-size: 0.9rem; color: rgba(255,255,255,0.85); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.odm-cta-card .btn { background: var(--accent); color: var(--primary-dark); }
.odm-cta-card .btn:hover { background: var(--accent-light); }

/* ODM Scope Table */
.odm-scope-grid { max-width: 1000px; margin: 0 auto; }
.scope-table-wrap { overflow-x: auto; }
.scope-table { width: 100%; border-collapse: collapse; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
.scope-table th {
  background: var(--primary); color: var(--white); padding: 16px 20px;
  text-align: left; font-weight: 600; font-size: 0.95rem;
}
.scope-table td {
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  font-size: 0.9rem; line-height: 1.6; vertical-align: top;
}
.scope-table td:first-child { font-weight: 600; color: var(--gray-700); white-space: nowrap; width: 140px; background: var(--gray-50); }
.scope-table tr:last-child td { border-bottom: none; }
.scope-table tr:hover td { background: var(--gray-50); }

/* Process Step Enhanced */
.process-step {
  text-align: center; padding: 32px 20px; background: var(--white);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  transition: all var(--transition); position: relative;
}
.process-step:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.process-step .step-num {
  width: 48px; height: 48px; line-height: 48px; border-radius: 50%;
  background: var(--primary); color: var(--white); font-weight: 700;
  margin: 0 auto 16px; font-size: 1.2rem;
}
.process-step h4 { margin-bottom: 8px; text-align: left; }
.process-step p { font-size: 0.88rem; color: var(--gray-500); margin: 0; text-align: left; }
.step-detail { font-size: 0.78rem; color: var(--gray-400); margin-top: 12px; padding: 8px 10px; background: var(--gray-50); border-radius: 6px; }

/* ODM Advantages */
.odm-advantages { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.advantage-card {
  padding: 28px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); transition: all var(--transition);
}
.advantage-card-primary { background: var(--white); }
.advantage-card-primary:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.advantage-icon { font-size: 2rem; margin-bottom: 14px; }
.advantage-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.advantage-card p { font-size: 0.88rem; color: var(--gray-500); margin: 0; line-height: 1.7; }

/* ODM Quality */
.quality-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.quality-item {
  display: flex; gap: 16px; padding: 24px;
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); transition: all var(--transition);
}
.quality-item:hover { box-shadow: var(--shadow-md); }
.quality-icon { font-size: 1.6rem; flex-shrink: 0; }
.quality-item h4 { font-size: 0.95rem; margin-bottom: 6px; }
.quality-item p { font-size: 0.82rem; color: var(--gray-500); margin: 0; line-height: 1.6; }

/* ODM Cert Badges */
.odm-certificates { margin-top: 40px; text-align: center; }
.odm-certificates h3 { margin-bottom: 20px; font-size: 1.1rem; }
.cert-badges { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.cert-badge {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 20px; background: var(--gray-50);
  border: 1px solid var(--border); border-radius: 8px;
  transition: all var(--transition);
}
.cert-badge:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
.cert-badge-icon { font-size: 1.1rem; }
.cert-badge-name { font-weight: 700; color: var(--gray-700); font-size: 0.88rem; }
.cert-badge-desc { font-size: 0.78rem; color: var(--gray-500); }

/* Application Grid */
.application-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.app-card {
  padding: 32px 24px; background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); text-align: center;
  transition: all var(--transition);
}
.app-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--primary-light); }
.app-icon { font-size: 2.2rem; margin-bottom: 16px; }
.app-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.app-card p { font-size: 0.85rem; color: var(--gray-500); margin: 0; line-height: 1.6; }

/* ---------- Certificates ---------- */
.cert-intro {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px;
  align-items: center;
}
.cert-intro-content h2 { font-size: 1.6rem; margin-bottom: 20px; }
.cert-intro-content p { line-height: 1.8; color: var(--gray-600); margin-bottom: 16px; }
.cert-intro-stats {
  display: flex; gap: 24px; justify-content: center; flex-wrap: wrap;
}
.cert-stat-item { text-align: center; padding: 24px 28px; background: var(--gray-50); border-radius: var(--radius-lg); min-width: 100px; }
.cert-stat-num { display: block; font-size: 2rem; font-weight: 800; color: var(--primary); }
.cert-stat-label { display: block; font-size: 0.8rem; color: var(--gray-500); margin-top: 4px; }

.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cert-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px 24px; text-align: center;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.cert-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); transform: translateY(-3px); border-color: var(--primary-light); }
.cert-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.cert-card p { font-size: 0.88rem; color: var(--gray-500); margin: 0; line-height: 1.6; }
.cert-card-ribbon {
  position: absolute; top: 0; right: 0; overflow: hidden;
  width: 100px; height: 100px;
}
.cert-card-ribbon span {
  position: absolute; top: 18px; right: -28px; transform: rotate(45deg);
  background: var(--primary); color: var(--white); font-size: 0.7rem;
  font-weight: 600; padding: 3px 32px; text-transform: uppercase;
  letter-spacing: 0.05em;
}
.cert-icon-large { font-size: 2.8rem; margin-bottom: 16px; display: flex; justify-content: center; }
.cert-card-badge {
  display: inline-block; margin-top: 14px; padding: 3px 14px;
  font-size: 0.75rem; font-weight: 600; color: var(--primary);
  background: rgba(26,54,93,0.08); border-radius: 4px;
}

/* Standards Grid */
.standards-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.standard-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 24px;
  transition: all var(--transition);
}
.standard-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.standard-flag { font-size: 2rem; margin-bottom: 14px; }
.standard-card h3 { font-size: 1rem; margin-bottom: 12px; }
.standard-card ul { list-style: none; padding: 0; margin: 0; }
.standard-card li {
  font-size: 0.82rem; color: var(--gray-600); padding: 6px 0;
  border-bottom: 1px solid var(--border); line-height: 1.5;
}
.standard-card li:last-child { border-bottom: none; }

/* Quality Commitment */
.quality-commitment {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start;
}
.commitment-content h2 { font-size: 1.6rem; margin-bottom: 16px; }
.commitment-content > p { line-height: 1.8; color: var(--gray-600); margin-bottom: 28px; }
.commitment-list { display: flex; flex-direction: column; gap: 16px; }
.commitment-item {
  display: flex; gap: 14px; padding: 16px 20px;
  background: var(--gray-50); border-radius: var(--radius-lg);
}
.commitment-icon { font-size: 1.4rem; flex-shrink: 0; }
.commitment-item h4 { font-size: 0.92rem; margin-bottom: 4px; }
.commitment-item p { font-size: 0.82rem; color: var(--gray-500); margin: 0; }

.commitment-card {
  background: var(--primary-dark); border-radius: var(--radius-lg);
  padding: 32px; color: var(--white); text-align: center;
}
.commitment-card h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--accent-light); }
.commitment-card > p { font-size: 0.9rem; color: rgba(255,255,255,0.7); margin-bottom: 24px; }
.commitment-card .btn { background: var(--accent); color: var(--primary-dark); }
.commitment-card .btn:hover { background: var(--accent-light); }

/* ---------- Blog ---------- */
.blog-layout { display: grid; grid-template-columns: 1fr 300px; gap: 40px; align-items: start; }
.blog-main { min-width: 0; }
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.blog-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: all var(--transition); display: flex; flex-direction: column;
}
.blog-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); transform: translateY(-3px); }

.blog-card-image {
  display: block; aspect-ratio: 16/9; overflow: hidden; background: var(--gray-50);
  position: relative;
}
.blog-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.blog-card:hover .blog-card-image img { transform: scale(1.05); }

.blog-img-placeholder {
  width: 100%; height: 100%; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 8px;
  color: var(--gray-300); font-size: 0.82rem;
}
.blog-img-icon { font-size: 2.5rem; }

.blog-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.blog-meta-top { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }
.blog-cat-badge {
  display: inline-block; padding: 3px 10px; font-size: 0.72rem; font-weight: 600;
  color: var(--primary); background: rgba(26,54,93,0.08); border-radius: 4px;
  text-transform: uppercase; letter-spacing: 0.03em;
}
.blog-date { font-size: 0.8rem; color: var(--gray-400); }
.blog-body h3 { font-size: 1rem; margin-bottom: 8px; flex: 1; }
.blog-body h3 a { color: var(--gray-800); line-height: 1.45; display: block; }
.blog-body h3 a:hover { color: var(--accent); }
.blog-body > p {
  font-size: 0.85rem; color: var(--gray-500); margin: 0 0 16px;
  line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 3;
  -webkit-box-orient: vertical; overflow: hidden;
}
.blog-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px; border-top: 1px solid var(--border); margin-top: auto;
}
.blog-author { font-size: 0.8rem; color: var(--gray-400); display: flex; align-items: center; gap: 4px; }
.blog-author-icon { font-size: 0.9rem; }
.blog-read-more { font-size: 0.82rem; color: var(--accent); font-weight: 500; }
.blog-read-more:hover { color: var(--primary); }

/* Blog Sidebar */
.blog-sidebar { display: flex; flex-direction: column; gap: 24px; }
.sidebar-widget {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
}
.sidebar-title {
  font-size: 1rem; font-weight: 700; margin-bottom: 16px;
  padding-bottom: 12px; border-bottom: 2px solid var(--primary); color: var(--gray-800);
}
.sidebar-cat-list { list-style: none; padding: 0; margin: 0; }
.sidebar-cat-list li { border-bottom: 1px solid var(--border); }
.sidebar-cat-list li:last-child { border-bottom: none; }
.sidebar-cat-list a {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 0; font-size: 0.88rem; color: var(--gray-600);
  transition: all var(--transition);
}
.sidebar-cat-list a:hover { color: var(--accent); padding-left: 4px; }
.sidebar-cat-list a span { font-size: 0.95rem; }

.sidebar-post-list { list-style: none; padding: 0; margin: 0; }
.sidebar-post-list li { border-bottom: 1px solid var(--border); }
.sidebar-post-list li:last-child { border-bottom: none; }
.sidebar-post-list a {
  display: block; padding: 10px 0; text-decoration: none;
}
.sidebar-post-title { display: block; font-size: 0.85rem; color: var(--gray-700); font-weight: 500; line-height: 1.4; margin-bottom: 4px; }
.sidebar-post-title:hover { color: var(--accent); }
.sidebar-post-date { display: block; font-size: 0.75rem; color: var(--gray-400); }

.sidebar-cta {
  background: var(--primary-dark); border-radius: var(--radius-lg);
  padding: 28px 24px; text-align: center; color: var(--white);
}
.sidebar-cta-icon { font-size: 2rem; margin-bottom: 12px; }
.sidebar-cta h3 { font-size: 1rem; margin-bottom: 8px; color: var(--accent-light); }
.sidebar-cta p { font-size: 0.82rem; color: rgba(255,255,255,0.7); margin-bottom: 20px; }

/* Blog Article Detail */
.blog-article { max-width: 780px; }
.article-header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.article-meta-top { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.article-title { font-size: 1.75rem; line-height: 1.3; margin-bottom: 14px; }
.article-author-row { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.article-readtime { font-size: 0.82rem; color: var(--gray-400); display: flex; align-items: center; gap: 4px; }

.article-body { line-height: 1.9; font-size: 1rem; color: var(--gray-700); }
.article-body p { margin-bottom: 16px; }
.article-body h2 { font-size: 1.3rem; margin: 32px 0 16px; }
.article-body h3 { font-size: 1.1rem; margin: 24px 0 12px; }
.article-body ul, .article-body ol { margin-bottom: 16px; padding-left: 24px; }
.article-body li { margin-bottom: 6px; }
.article-body img { max-width: 100%; border-radius: var(--radius); margin: 16px 0; }
.article-body blockquote {
  border-left: 4px solid var(--primary); padding: 12px 20px;
  margin: 16px 0; background: var(--gray-50); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--gray-600); font-style: italic;
}

.article-footer {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--border);
  flex-wrap: wrap; gap: 16px;
}
.article-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tag-label { font-size: 0.85rem; color: var(--gray-500); }
.article-tag {
  display: inline-block; padding: 3px 10px; font-size: 0.78rem;
  background: var(--gray-50); border: 1px solid var(--border);
  border-radius: 4px; color: var(--gray-600);
}
.article-share { display: flex; align-items: center; gap: 8px; }
.article-share span { font-size: 0.85rem; color: var(--gray-500); }
.share-link {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--gray-100); font-size: 0.85rem; font-weight: 700;
  color: var(--gray-600); transition: all var(--transition);
}
.share-link:hover { background: var(--primary); color: var(--white); }

.article-nav { margin-top: 32px; }
.related-posts-bottom { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.related-posts-bottom .section-title { margin-bottom: 24px; }

/* ---------- FAQ / Help ---------- */
.help-content { max-width: 800px; margin: 0 auto; }
.help-section h2 { margin-bottom: 24px; }
.faq-list { display: flex; flex-direction: column; gap: 4px; }
.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all var(--transition);
}
.faq-item:hover { border-color: var(--primary-light); }
.faq-item h3 {
  padding: 20px 24px; font-size: 1rem; font-weight: 600;
  color: var(--gray-800); cursor: pointer;
  display: flex; align-items: center; gap: 12px;
  transition: background var(--transition);
}
.faq-item h3:hover { background: var(--gray-50); }
.faq-item p {
  padding: 0 24px 20px; margin: 0; font-size: 0.92rem;
  color: var(--gray-500); line-height: 1.7;
}

/* ---------- 404 ---------- */
.page-404 { padding: 120px 0; text-align: center; }
.error-page h1 { font-size: 8rem; font-weight: 800; color: var(--gray-100); line-height: 1; }
.error-page h2 { font-size: 2rem; margin: 16px 0; }
.error-page p { color: var(--gray-500); margin-bottom: 32px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--primary-dark); color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 48px;
  padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .footer-logo-text {
  font-size: 1.5rem; font-weight: 800; color: var(--white);
  margin-bottom: 16px;
}
.footer-desc { font-size: 0.88rem; line-height: 1.8; color: rgba(255,255,255,0.6); }
.footer-col h4 {
  font-size: 1rem; color: var(--white); font-weight: 600;
  margin-bottom: 20px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 0.88rem; color: rgba(255,255,255,0.6);
  transition: all var(--transition);
}
.footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact li span { font-size: 0.88rem; color: rgba(255,255,255,0.6); }
.footer-contact li a { color: var(--accent-light); }
.footer-bottom {
  padding: 24px 0; text-align: center;
  font-size: 0.85rem; color: rgba(255,255,255,0.4);
}
.footer-bottom p { margin: 0; }

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed; bottom: 32px; right: 32px;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: var(--white); border: none;
  cursor: pointer; display: flex; align-items: center;
  justify-content: center; font-size: 1.2rem;
  opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: all var(--transition); z-index: 999;
  box-shadow: var(--shadow-lg);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-light); }

/* ---------- Alerts ---------- */
.alert { padding: 16px 20px; border-radius: var(--radius); margin-bottom: 16px; font-size: 0.9rem; }
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .product-grid, .blog-grid, .features-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-layout { grid-template-columns: 1fr; gap: 32px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .odm-process { grid-template-columns: repeat(2, 1fr); }
  .odm-features { grid-template-columns: repeat(2, 1fr); }
  .standards-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  /* Mobile Menu - Full overhaul */
  .main-nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: var(--white); box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    border-bottom: 2px solid var(--border);
    padding: 0; max-height: 0; overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
  }
  .main-nav.open {
    display: block; max-height: 500px; padding: 12px 16px 20px;
  }
  .main-nav ul {
    flex-direction: column; gap: 2px;
  }
  .main-nav a {
    display: block; padding: 14px 16px; font-size: 1rem;
    border-radius: 8px; min-height: 48px; line-height: 20px;
  }
  .main-nav .btn-nav-inquiry {
    text-align: center; margin-top: 8px;
    padding: 14px 24px !important;
  }
  .mobile-menu-toggle {
    display: flex; padding: 12px; min-width: 44px; min-height: 44px;
    align-items: center; justify-content: center;
  }
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .mobile-menu-toggle.active span:nth-child(2) { opacity: 0; }
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
  .logo-text { font-size: 1.25rem; }
  .logo-tag { font-size: 0.6rem; }

  /* Hero */
  .hero-title { font-size: 1.75rem; }
  .hero-banner { padding: 48px 0 40px; }
  .hero-subtitle { font-size: 1rem; margin-bottom: 28px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; text-align: center; padding: 14px 24px; min-height: 48px; }

  /* Sections & Spacing */
  .section { padding: 40px 0; }
  .section-title { margin-bottom: 2rem; }
  .section-title h2 { font-size: 1.5rem; }

  /* Badges */
  .badges-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .badge-item { padding: 12px; }
  .badge-icon { width: 40px; height: 40px; font-size: 1.1rem; }
  .badge-text strong { font-size: 0.85rem; }

  /* Grids -> 1 column */
  .product-grid, .blog-grid, .features-grid { grid-template-columns: 1fr; gap: 16px; }
  .blog-main { order: 0; }
  .blog-sidebar { order: 1; }
  .blog-card-image { aspect-ratio: 16/9; }
  .blog-body { padding: 16px; }
  .sidebar-widget { padding: 16px; }
  .sidebar-cta { padding: 20px 16px; }
  .article-title { font-size: 1.3rem; }
  .article-footer { flex-direction: column; align-items: flex-start; }
  .related-posts-bottom .blog-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .odm-process { grid-template-columns: 1fr; gap: 16px; }
  .odm-features { grid-template-columns: 1fr; gap: 16px; }
  .cert-grid { grid-template-columns: 1fr; gap: 20px; }
  .cert-intro { grid-template-columns: 1fr; gap: 32px; }
  .cert-intro-content h2 { font-size: 1.35rem; }
  .standards-grid { grid-template-columns: 1fr; gap: 16px; }
  .quality-commitment { grid-template-columns: 1fr; gap: 32px; }
  .commitment-card { padding: 24px; }

  /* Product Cards */
  .product-card-body { padding: 16px; }
  .product-card-body h3 { font-size: 0.92rem; min-height: auto; }
  .product-card-body p { -webkit-line-clamp: 1; }
  .product-card-image { padding-top: 66%; }

  /* Product Detail */
  .product-detail-grid, .product-detail-layout { grid-template-columns: 1fr; gap: 32px; }
  .product-detail-images { position: static; }
  .product-main-image { padding: 24px; }
  .product-detail-title { font-size: 1.3rem; }
  .product-actions, .product-detail-actions { flex-direction: column; }
  .product-actions .btn, .product-detail-actions .btn { width: 100%; min-height: 48px; justify-content: center; }
  .related-products-grid { grid-template-columns: repeat(2,1fr); gap: 16px; }
  .product-features-grid { grid-template-columns: 1fr; }
  .product-cta-section { padding: 32px 24px; }
  .product-cta-section h2 { font-size: 1.2rem; }
  .specs-table td { padding: 10px 12px; font-size: 0.85rem; }
  .specs-table td:first-child { width: 40%; }
  .product-tab-btn { padding: 12px 16px; font-size: 0.85rem; }

  /* Stats */
  .stat-item { padding: 20px 8px; }
  .stat-number { font-size: 1.8rem; }
  .stat-label { font-size: 0.8rem; }

  /* Feature Cards */
  .feature-card { padding: 24px 20px; }
  .feature-card .feature-icon { width: 48px; height: 48px; font-size: 1.3rem; }

  /* CTA */
  .cta-section { padding: 48px 24px; }
  .cta-section h2 { font-size: 1.5rem; }
  .cta-section p { font-size: 0.95rem; margin-bottom: 28px; }
  .cta-section .btn { width: 100%; padding: 14px 24px; min-height: 48px; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .inquiry-form { padding: 24px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-group input, .form-group textarea, .form-group select {
    padding: 14px 16px; font-size: 16px; /* Prevent iOS zoom */
    min-height: 48px;
  }
  .inquiry-form .btn { min-height: 48px; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .site-footer { padding: 40px 0 0; }
  .footer-col h4 { margin-bottom: 16px; }
  .footer-col ul li { margin-bottom: 8px; }
  .footer-col ul li a { min-height: 44px; display: flex; align-items: center; }

  /* Page Banner */
  .page-banner { padding: 40px 0 32px; }
  .page-banner h1 { font-size: 1.5rem; }

  /* ODM */
  .odm-hero { grid-template-columns: 1fr; gap: 24px; }
  .odm-hero-content h2 { font-size: 1.4rem; }
  .odm-hero-stats { gap: 16px; justify-content: center; }
  .hero-stat-num { font-size: 1.4rem; }
  .odm-cta-card { padding: 24px; }
  .odm-process { margin: 24px 0; gap: 16px; }
  .process-step { padding: 24px 16px; }
  .odm-advantages { grid-template-columns: 1fr; gap: 16px; }
  .quality-grid { grid-template-columns: 1fr; gap: 16px; }
  .quality-item { padding: 20px; }
  .application-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .app-card { padding: 24px; }
  .scope-table td:first-child { white-space: normal; width: 110px; }

  /* FAQ */
  .faq-item h3 { padding: 16px 18px; font-size: 0.95rem; min-height: 48px; }
  .faq-item p { padding: 0 18px 16px; font-size: 0.88rem; }

  /* 404 */
  .page-404 { padding: 60px 0; }

  /* Back to top */
  .back-to-top { bottom: 20px; right: 20px; width: 48px; height: 48px; }

  /* Filter Bar - Mobile */
  .filter-bar { padding: 16px; }
  .filter-form { flex-direction: column; gap: 12px; }
  .filter-group { min-width: 100%; }
  .filter-results { margin-left: 0; width: 100%; justify-content: center; }
  .search-box .filter-input { font-size: 16px; }
  .pagination-section { margin-top: 24px; }
  .pagination-wrap { flex-direction: column; gap: 12px; }
  .page-link { min-width: 36px; height: 36px; font-size: 0.82rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .badges-grid { grid-template-columns: 1fr; gap: 8px; }
  .stats-grid { gap: 12px; }
  .hero-title { font-size: 1.4rem; }
  .hero-banner { padding: 36px 0 32px; }
  .hero-subtitle { font-size: 0.92rem; }
  .page-banner h1 { font-size: 1.3rem; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
  .cta-section { padding: 36px 16px; }
  .cta-section h2 { font-size: 1.3rem; }
  .section-title h2 { font-size: 1.3rem; }
  .stat-number { font-size: 1.5rem; }
  .product-card-image { aspect-ratio: 16/9; }
  .application-grid { grid-template-columns: 1fr; }
  .scope-table td { font-size: 0.82rem; padding: 10px 12px; }
  .related-products-grid { grid-template-columns: 1fr; }
  .product-features-grid { grid-template-columns: 1fr; }
  .product-features-html ul { grid-template-columns: 1fr; }
  .feature-item { flex-direction: column; gap: 8px; padding: 14px; }
  .process-step { gap: 12px; padding-bottom: 16px; }
  .process-step:not(:last-child), .process-step:last-child { padding-left: 16px; margin-left: 8px; }
  .process-step-num { left: -32px; width: 24px; height: 24px; font-size: 0.7rem; }
  .process-step-info p { font-size: 0.82rem; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .product-tab-btn { padding: 10px 14px; font-size: 0.82rem; }
  .product-tabs-nav { gap: 0; }
}