/* ============================================================
   万联海通 (Wanlian Haitong) - 企业独立站全局样式
   现代工业风格 · Mobile-First · 2026
   ============================================================ */

/* --- CSS Variables --- */
:root {
  /* 主色：深蓝工业风 */
  --primary: #0a1628;
  --primary-light: #152240;
  --primary-medium: #1e3a5f;
  /* 强调色：能源橙 */
  --accent: #f15a24;
  --accent-hover: #d44a1a;
  --accent-light: #fff0eb;
  /* 辅助色 */
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #f1f3f5;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #adb5bd;
  --gray-500: #6c757d;
  --gray-600: #495057;
  --gray-700: #343a40;
  --gray-800: #212529;
  --gray-900: #111;
  --success: #2b8a3e;
  --warning: #f08c00;
  /* 字体 */
  --font-en: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-zh: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  /* 间距 */
  --max-width: 1280px;
  --header-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.12);
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-en);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-800);
  background: var(--white);
  overflow-x: hidden;
}

/* 中文段落使用中文字体 */
[lang="zh-CN"] body,
.lang-zh body {
  font-family: var(--font-zh);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-hover); }

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol { list-style: none; }

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Section通用 --- */
.section {
  padding: 80px 0;
}
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header .label {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-header p {
  font-size: 17px;
  color: var(--gray-500);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}
.section-dark {
  background: var(--primary);
  color: var(--white);
}
.section-dark .section-header h2 { color: var(--white); }
.section-dark .section-header p { color: var(--gray-400); }
.section-light {
  background: var(--gray-50);
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: background var(--transition);
}
.site-header.scrolled {
  background: rgba(10, 22, 40, 0.98);
  box-shadow: 0 2px 20px rgba(0,0,0,.3);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.header-logo img {
  height: 46px;
  width: auto;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.header-nav a {
  color: rgba(255,255,255,.75);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
  white-space: nowrap;
}
.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.header-nav a:hover,
.header-nav a.active {
  color: var(--white);
}
.header-nav a:hover::after,
.header-nav a.active::after {
  width: 100%;
}

/* --- Nav Dropdown --- */
.nav-dropdown {
  position: relative;
}
.nav-dropdown > .nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}
.nav-dropdown > .nav-trigger::after {
  content: '▼';
  font-size: 8px;
  margin-left: 2px;
  transition: transform var(--transition);
}
.nav-dropdown:hover > .nav-trigger::after {
  transform: rotate(180deg);
}
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0,0,0,.18);
  min-width: 220px;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transition: all .2s ease;
  z-index: 100;
}
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu a {
  display: block;
  padding: 12px 20px;
  font-size: 14px;
  color: var(--gray-700) !important;
  border-bottom: 1px solid var(--gray-100);
  transition: all var(--transition);
}
.nav-dropdown-menu a:last-child {
  border-bottom: none;
}
.nav-dropdown-menu a:hover {
  background: var(--accent-light);
  color: var(--accent) !important;
}
.nav-dropdown-menu a::after {
  display: none !important;
}

/* --- Lang Selector (chinagenuine-style flag dropdown) --- */
.lang-selector {
  position: relative;
  margin-left: 12px;
  display: inline-block;
}
.lang-selector .current-lang {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 38px;
  padding: 6px 10px;
  cursor: pointer;
  border-radius: 4px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  transition: all var(--transition);
}
.lang-selector .current-lang:hover {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.25);
}
.lang-selector .current-lang .lang-flag {
  font-size: 16px;
  line-height: 1;
}
.lang-selector .current-lang em {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,.9);
  text-transform: uppercase;
  font-style: normal;
  line-height: 1;
}
.lang-selector .current-lang i {
  font-size: 10px;
  color: rgba(255,255,255,.6);
  transition: transform var(--transition);
}
.lang-selector:hover .current-lang i {
  transform: rotate(180deg);
}
.lang-selector .lang-box {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  z-index: 1000;
  width: 200px;
  padding: 10px 0;
  background: var(--white);
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(0,0,0,.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all .28s ease;
}
.lang-selector:hover .lang-box {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang-selector .lang-box::before {
  content: '';
  position: absolute;
  right: 36px;
  top: -8px;
  border-right: 8px solid transparent;
  border-bottom: 8px solid var(--white);
  border-left: 8px solid transparent;
}
.lang-selector .lang-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 0;
  max-height: 55vh;
  overflow-y: auto;
  padding: 0 4px;
}
.lang-selector .lang-list li {
  list-style: none;
}
.lang-selector .lang-list a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  border-radius: 4px;
  transition: all .15s ease;
  white-space: nowrap;
}
.lang-selector .lang-list a:hover {
  background: var(--accent-light);
  color: var(--accent);
}
.lang-selector .lang-list a.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 700;
}
.lang-selector .lang-list .lang-flag {
  font-size: 16px;
  line-height: 1;
  flex-shrink: 0;
}

/* --- Mobile Menu Toggle --- */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition);
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: var(--primary);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
  transition: opacity 0.8s ease;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,22,40,0.7) 0%, rgba(10,22,40,0.85) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 24px;
}
.hero-content h1 {
  font-size: 48px;
  font-weight: 900;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero-content h1 .accent {
  color: var(--accent);
}
.hero-content p {
  font-size: 18px;
  color: rgba(255,255,255,.75);
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(241,90,36,.35);
}
.btn-dark:hover {
  color: var(--white);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.3);
}
.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255,255,255,.08);
  transform: translateY(-2px);
}
.btn-dark {
  background: var(--primary);
  color: var(--white);
}
.btn-dark:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(10,22,40,.25);
}

/* --- Stats Strip --- */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: var(--accent);
}
.stat-item {
  text-align: center;
  padding: 32px 16px;
  color: var(--white);
  border-right: 1px solid rgba(255,255,255,.15);
}
.stat-item:last-child { border-right: none; }
.stat-number {
  font-size: 36px;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 14px;
  opacity: 0.85;
  letter-spacing: 0.5px;
}

/* --- About Brief Section --- */
.about-brief {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-brief-text h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 20px;
  line-height: 1.3;
}
.about-brief-text p {
  font-size: 16px;
  color: var(--gray-600);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-brief-text .btn { margin-top: 8px; }
.about-brief-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--gray-200);
}
.about-brief-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.about-brief-image .placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background: var(--gray-200);
  color: var(--gray-400);
  font-size: 15px;
}






  height: 56px;
  border-radius: var(--radius);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 26px;
}













  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border: 1px solid var(--gray-100);
}
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
  width: 100%;
  height: 180px;
  overflow: hidden;
}
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
  
}
  transform: scale(1.05);
}
  padding: 20px 22px 24px;
}
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* --- Product Tabs --- */
.product-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
}
.product-tab {
  padding: 12px 28px;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  background: var(--white);
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.product-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.product-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}
.product-tab-content {
  display: none;
  animation: fadeIn .4s ease;
}
.product-tab-content.active {
  display: block;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Product Grid --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

a.product-card { display: block; text-decoration: none; color: inherit; }
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border: 1px solid var(--gray-100);
}

/* product card link styling */
.product-card[onclick] { cursor: pointer; }
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.product-card-image {
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--gray-100);
}
.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.product-card:hover .product-card-image img {
  transform: scale(1.05);
}
.product-card-body {
  padding: 20px 22px 24px;
}
.product-card-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}
.product-card-body .tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  background: var(--accent-light);
  color: var(--accent);
  margin-bottom: 10px;
}
.product-card-body p {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* --- Partners --- */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 24px 36px;
}
.partner-item {
  padding: 12px;
  opacity: 0.85;
  transition: all var(--transition);
}
.partner-item:hover { opacity: 1; transform: translateY(-2px); }
.partner-item .partner-logo {
  width: 120px;
  height: 46px;
  background: rgba(255,255,255,.92);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  letter-spacing: 0.5px;
  padding: 8px 12px;
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  text-align: center;
  padding: 80px 0;
}
.cta-section h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 18px;
  color: rgba(255,255,255,.7);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Page Top Banner --- */
.page-banner {
  background: var(--primary);
  padding: 160px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-banner .banner-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-banner .banner-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse at center, rgba(241,90,36,0.08) 0%, transparent 70%);
}
.page-banner .container {
  position: relative;
  z-index: 2;
}
.page-banner h1 {
  font-size: 44px;
  font-weight: 900;
  color: var(--white);
  margin-bottom: 12px;
  position: relative;
}
.page-banner p {
  font-size: 18px;
  color: rgba(255,255,255,.65);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* --- Timeline (Milestones) --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gray-200);
}
.timeline-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
  position: relative;
}
.timeline-item:nth-child(even) {
  direction: rtl;
}
.timeline-item:nth-child(even) .timeline-content {
  direction: ltr;
}
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 8px;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--accent);
  z-index: 2;
}
.timeline-year {
  font-size: 28px;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 8px;
  text-align: right;
}
.timeline-item:nth-child(even) .timeline-year {
  text-align: left;
}
.timeline-content {
  background: var(--white);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 3px solid var(--accent);
}
.timeline-item:nth-child(even) .timeline-content {
  border-left: none;
  border-right: 3px solid var(--accent);
}
.timeline-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}
.timeline-content p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* --- Certificate Grid --- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.cert-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--gray-100);
}
.cert-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.cert-card img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  padding: 16px;
  background: var(--gray-50);
}
.cert-card-body {
  padding: 12px 16px 16px;
}
.cert-card-body h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 4px;
}
.cert-card-body span {
  font-size: 12px;
  color: var(--gray-400);
}

/* --- Contact --- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: start;
}
.contact-info h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 16px;
}
.contact-info > p {
  font-size: 16px;
  color: var(--gray-500);
  margin-bottom: 36px;
  line-height: 1.7;
}
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 28px;
}
.contact-detail .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-detail h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.contact-detail span {
  font-size: 15px;
  color: var(--gray-600);
}
.contact-form-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-100);
}
.contact-form-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 24px;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  transition: all var(--transition);
  background: var(--gray-50);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(241,90,36,.12);
  background: var(--white);
}
.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

/* --- Solution Cards --- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.solution-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.solution-card-header {
  padding: 32px 28px 0;
}
.solution-card-header .sol-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.solution-card-header h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.solution-card-header p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}
.solution-card ul {
  padding: 16px 28px 32px;
}
.solution-card ul li {
  font-size: 14px;
  color: var(--gray-600);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}
.solution-card ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* --- Footer --- */
.site-footer {
  background: var(--primary);
  color: rgba(255,255,255,.65);
  padding: 56px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 18px;
}
.footer-col p {
  font-size: 13px;
  line-height: 1.8;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,.55);
  padding: 4px 0;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}
.footer-bottom a { color: rgba(255,255,255,.45); }

/* --- Mobile Nav --- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(10,22,40,.98);
  backdrop-filter: blur(20px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
}
.mobile-nav.active { display: flex; }
.mobile-nav a {
  font-size: 22px;
  font-weight: 600;
  color: rgba(255,255,255,.8);
  transition: color var(--transition);
}
.mobile-nav a:hover,
.mobile-nav a.active { color: var(--accent); }
.mobile-nav .lang-selector { margin-left: 0; margin-top: 16px; }

/* --- WhatsApp Floating Button --- */
.whatsapp-float {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #25D366;
  box-shadow: 0 4px 16px rgba(37,211,102,.4);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  cursor: pointer;
}
.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(37,211,102,.5);
}
.whatsapp-float svg {
  width: 28px;
  height: 28px;
  fill: #fff;
}
@media (max-width: 768px) {
  .whatsapp-float {
    bottom: 20px;
    right: 16px;
    width: 50px;
    height: 50px;
  }
  .whatsapp-float svg {
    width: 24px;
    height: 24px;
  }
}

/* --- WhatsApp Floating Button --- */
.whatsapp-float {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #25D366;
  box-shadow: 0 4px 16px rgba(37,211,102,.4);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .25s ease;
  cursor: pointer;
}
.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(37,211,102,.5);
}
.whatsapp-float svg {
  width: 28px;
  height: 28px;
  fill: #fff;
}
@media (max-width: 768px) {
  .whatsapp-float {
    bottom: 20px;
    right: 16px;
    width: 50px;
    height: 50px;
  }
  .whatsapp-float svg {
    width: 24px;
    height: 24px;
  }
}

/* --- Placeholder --- */
.placeholder-block {
  background: var(--gray-50);
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  color: var(--gray-400);
  font-size: 13px;
  text-align: center;
  letter-spacing: 1px;
}

/* --- FAQ ---
   注：FAQ 组件已迁移到 v2 (下方 GEO 优化 FAQ 组件)
   旧版用 .faq-item.open + max-height 0/300px 模式，与 <details> [open] 冲突
   已删除，新版使用 <details> + [open] 属性选择器 + 高度自适应
*/

/* --- Product Detail Page --- */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.product-detail-gallery {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--gray-50);
  aspect-ratio: 1;
}
.product-detail-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  padding: 24px;
}
.product-detail-info h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}
.product-detail-info .subtitle {
  font-size: 15px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 20px;
}
.product-detail-info .desc {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 24px;
}
.product-specs-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
}
.product-specs-table td {
  padding: 10px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--gray-200);
}
.product-specs-table td:first-child {
  font-weight: 600;
  color: var(--primary);
  width: 35%;
  background: var(--gray-50);
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2) { border-right: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: 1fr; }
  .about-brief { grid-template-columns: 1fr; gap: 32px; }
  .about-brief-image { aspect-ratio: 16/9; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }
  .hero { min-height: 60vh; }
  .hero-content h1 { font-size: 28px; }
  .hero-content p { font-size: 16px; }
  .section { padding: 56px 0; }
  .section-header h2 { font-size: 28px; }
  .page-banner { padding: 130px 0 56px; }
  .page-banner h1 { font-size: 32px; }
  .product-grid,
  .cert-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .header-nav { display: none; }
  .menu-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .timeline::before { left: 20px; }
  .timeline-item { grid-template-columns: 1fr; gap: 8px; padding-left: 52px; }
  .timeline-item:nth-child(even) { direction: ltr; }
  .timeline-dot { left: 20px; }
  .timeline-year { text-align: left !important; }
  .product-detail { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 28px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .stats-strip { grid-template-columns: 1fr; }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,.15); }
  .stat-item:last-child { border-bottom: none; }
  .page-banner h1 { font-size: 28px; }
  .contact-form-card { padding: 24px; }
}

/* ====== ADVANTAGES GRID (fresh) ====== */
.advantages-grid {
  display: grid !important;
  grid-template-columns: repeat(3, 1fr) !important;
  gap: 28px !important;
}
.advantage-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border: 1px solid var(--gray-100);
}
.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.advantage-card-image {
  width: 100%;
  height: 180px;
  overflow: hidden;
  background: var(--gray-100);
}
.advantage-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
  
}
.advantage-card:hover .advantage-card-image img {
  transform: scale(1.05);
}
.advantage-card-body {
  padding: 20px 22px 24px;
}
.advantage-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.advantage-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}
@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}
@media (max-width: 768px) {
  .advantages-grid {
    grid-template-columns: 1fr !important;
  }
}
/* verified */

/* ============================================================
   产品页新组件 v2 (2026-07-11)
   - .feature-card-grid  数据指标卡（替代原图+文卡）
   - .scenario-grid       应用场景卡
   - .spec-list           技术参数表
   ============================================================ */
.feature-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 38px 28px 34px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}
.feature-card__icon {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  color: var(--white);
  margin: 0 auto 20px;
  box-shadow: 0 8px 20px rgba(241, 90, 36, .25);
}
.feature-card__metric {
  font-size: 38px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 4px;
  letter-spacing: -.02em;
}
.feature-card__unit {
  font-size: 12px;
  color: var(--gray-500);
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 10px;
}
.feature-card p {
  font-size: 13.5px;
  color: var(--gray-600);
  line-height: 1.65;
  margin: 0;
}

/* 应用场景 */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.scenario-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 34px 22px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
}
.scenario-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.scenario-card__icon {
  font-size: 44px;
  line-height: 1;
  margin-bottom: 16px;
}
.scenario-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 8px;
}
.scenario-card p {
  font-size: 13px;
  color: var(--gray-600);
  line-height: 1.6;
  margin: 0;
}

/* 技术参数 */
.spec-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  max-width: 960px;
  margin: 0 auto;
}
.spec-row {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition);
  gap: 16px;
}
.spec-row:hover {
  box-shadow: var(--shadow);
  border-left-width: 6px;
}
.spec-row__label {
  font-size: 14px;
  color: var(--gray-600);
  font-weight: 500;
}
.spec-row__value {
  font-size: 15.5px;
  color: var(--primary);
  font-weight: 700;
  text-align: right;
}

@media (max-width: 880px) {
  .feature-card-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-list { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .feature-card-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   产品页 左右交替 6 段布局 v3 (2026-07-11)
   - 跟首页 3x2 advantage-card 网格完全不同的排版
   - 6 段每段全宽 1 行，奇数图左文右，偶数图右文左
   - 类似 cases.html 的 left/right 交替
   ============================================================ */
.alt-features {
  display: flex;
  flex-direction: column;
  gap: 56px;
  margin-top: 8px;
}
.alt-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
}
.alt-row:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}
/* 偶数段：图右文左 → reverse order */
.alt-row.is-reverse {
  direction: rtl;
}
.alt-row.is-reverse > * {
  direction: ltr;
}
.alt-row__image {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--primary), #1a3a5c);
  position: relative;
  box-shadow: 0 8px 24px rgba(10, 18, 31, .12);
}
.alt-row__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .5s var(--transition);
}
.alt-row:hover .alt-row__image img {
  transform: scale(1.04);
}
/* 图片角标（特色标识） */
.alt-row__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(10, 18, 31, .78);
  color: var(--white);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 6px;
}
.alt-row__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.alt-row__content {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.alt-row__num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .18em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}
.alt-row__num::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--accent);
  display: inline-block;
}
.alt-row__metric {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 4px 0 6px;
}
.alt-row__metric-num {
  font-size: 52px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -.03em;
  font-family: var(--font-sans);
}
.alt-row__metric-unit {
  font-size: 18px;
  color: var(--gray-700);
  font-weight: 600;
}
.alt-row__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.4;
  margin: 0;
}
.alt-row__desc {
  font-size: 14.5px;
  color: var(--gray-600);
  line-height: 1.75;
  margin: 0;
}
.alt-row__points {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.alt-row__points li {
  font-size: 13.5px;
  color: var(--gray-700);
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.alt-row__points li::before {
  content: "✓";
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--white);
  font-size: 11px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

@media (max-width: 880px) {
  .alt-features { gap: 28px; }
  .alt-row,
  .alt-row.is-reverse {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px;
    direction: ltr;
  }
  .alt-row__metric-num { font-size: 42px; }
  .alt-row__title { font-size: 19px; }
}
@media (max-width: 520px) {
  .alt-row { padding: 20px; }
  .alt-row__metric-num { font-size: 36px; }
  .alt-row__title { font-size: 17px; }
  .alt-row__desc { font-size: 13.5px; }
}
/* verified */

/* ============================================================
   GEO 优化 FAQ 组件 (2026-07-11)
   - 用于 4 个产品页的 FAQ section
   - 配合 FAQPage JSON-LD schema 让 AI 引擎直接抽取 Q&A
   ============================================================ */
.faq-section {
  background: var(--white);
}
.faq-section.section-light {
  background: var(--gray-50);
}
.faq-list {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:hover {
  box-shadow: var(--shadow);
  border-left-width: 6px;
}
.faq-item[open] {
  box-shadow: var(--shadow);
  border-left-width: 6px;
  border-color: var(--accent);
}
.faq-item summary {
  cursor: pointer;
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-question {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.5;
  flex: 1;
}
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
  transition: transform .3s var(--transition);
}
.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  padding: 18px 28px 24px;
  font-size: 14.5px;
  color: var(--gray-700);
  line-height: 1.8;
  border-top: 1px dashed var(--gray-100);
  margin-top: 4px;
}
.faq-answer p { margin: 0; }
.faq-answer strong { color: var(--primary); font-weight: 700; }
.faq-group-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  margin: 36px 0 16px;
  padding: 10px 0 10px 16px;
  border-left: 4px solid var(--accent);
  background: linear-gradient(90deg, rgba(241, 90, 36, .06), transparent 60%);
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}
.faq-group-title:first-of-type { margin-top: 0; }

@media (max-width: 520px) {
  .faq-item summary { padding: 16px 20px; gap: 12px; }
  .faq-question { font-size: 14.5px; }
  .faq-answer { padding: 14px 20px 20px; font-size: 13.5px; }
  .faq-icon { width: 24px; height: 24px; font-size: 14px; }
}
/* verified */

/* ==== International Recognition (非洲商务联盟) ==== */
.international-cred-grid { max-width: 1080px; margin: 0 auto; }
.international-cred-card {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 1.4fr;
  gap: 48px;
  align-items: center;
  background: linear-gradient(180deg, #fff, #f6f8fb);
  border: 1px solid rgba(241, 90, 36, .12);
  border-radius: 16px;
  padding: 36px;
  box-shadow: 0 4px 24px rgba(10, 18, 31, .06);
}
.international-cred-image img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .12);
}
.international-cred-body h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 6px;
}
.international-cred-body .cred-en {
  font-size: 14px;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 18px;
  letter-spacing: .3px;
}
.international-cred-body .cred-desc {
  font-size: 15px;
  line-height: 1.85;
  color: #374151;
  margin: 0 0 18px;
}
.cred-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 18px;
}
.cred-points li {
  font-size: 14px;
  color: #1f2937;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(0, 0, 0, .08);
}
.cred-points li strong { color: var(--primary); margin-right: 6px; }

/* cases.html international-recognition */
.international-recognition {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: center;
  max-width: 1080px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid rgba(241, 90, 36, .12);
  border-radius: 16px;
  padding: 36px;
  box-shadow: 0 4px 24px rgba(10, 18, 31, .05);
}
.international-recognition-image img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .12);
}
.international-recognition-body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 14px;
  line-height: 1.4;
}
.international-recognition-body p {
  font-size: 15px;
  line-height: 1.85;
  color: #374151;
  margin: 0 0 20px;
}
.recognition-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.recognition-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(241, 90, 36, .08);
  color: var(--accent);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(241, 90, 36, .2);
}

@media (max-width: 768px) {
  .international-cred-card,
  .international-recognition {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px;
  }
  .cred-points { grid-template-columns: 1fr; }
}
/* verified */