/* =============================================
   南京嘉禾供水设备有限公司 - 主样式表
   风格：蓝白绿工业风，响应式
   ============================================= */

/* CSS 变量定义 */
:root {
  --blue-primary: #1a6fb5;
  --blue-dark: #0a2d5e;
  --blue-light: #4a9ed5;
  --blue-pale: #e8f4fd;
  --green-primary: #2eaa72;
  --green-dark: #1a7a4e;
  --green-light: #5bc99a;
  --green-pale: #e8f8f0;
  --teal: #1aabb5;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f0f4f8;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e0;
  --gray-500: #718096;
  --gray-700: #2d3748;
  --gray-900: #1a202c;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.14);
  --radius: 10px;
  --radius-lg: 16px;
  --transition: all 0.3s ease;
}

/* 基础重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--gray-700);
  line-height: 1.6;
  background: var(--white);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* =============================================
   顶部信息栏
   ============================================= */
.top-bar {
  background: var(--blue-dark);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 7px 0;
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.top-bar-left, .top-bar-right {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.top-bar span { display: flex; align-items: center; gap: 6px; }
.top-bar i { color: var(--green-light); font-size: 12px; }

/* =============================================
   导航栏
   ============================================= */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  border-bottom: 3px solid var(--blue-primary);
  transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-md); }
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon { width: auto; height: 52px; flex-shrink: 0; }
.logo-icon svg { width: 100%; height: 100%; }
.logo-icon img { height: 52px; width: auto; display: block; object-fit: contain; background: transparent; }
.logo-text { display: flex; flex-direction: column; }
.logo-cn {
  font-size: 17px;
  font-weight: 700;
  color: var(--blue-dark);
  letter-spacing: 0.5px;
  line-height: 1.3;
}
.logo-en {
  font-size: 9px;
  color: var(--gray-500);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  line-height: 1.3;
}
.nav ul {
  display: flex;
  gap: 4px;
}
.nav ul li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-700);
  border-radius: 6px;
  position: relative;
  transition: var(--transition);
}
.nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%; right: 50%;
  height: 2px;
  background: var(--blue-primary);
  transition: var(--transition);
  border-radius: 2px;
}
.nav ul li a:hover, .nav ul li a.active {
  color: var(--blue-primary);
  background: var(--blue-pale);
}
.nav ul li a:hover::after, .nav ul li a.active::after {
  left: 16px; right: 16px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2.5px;
  background: var(--blue-dark);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* =============================================
   Hero 轮播
   ============================================= */
.hero {
  position: relative;
  height: 560px;
  overflow: hidden;
}
.hero-slider { height: 100%; }
.hero-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  padding: 0 20px;
  opacity: 0;
  transform: translateX(100%);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.hero-slide.active {
  opacity: 1;
  transform: translateX(0);
}
.hero-slide.exiting {
  opacity: 0;
  transform: translateX(-100%);
}
.hero-content {
  max-width: 600px;
  margin-left: calc((100vw - 1200px)/2);
  padding-left: 20px;
  color: var(--white);
  z-index: 2;
}
.hero-badge {
  display: inline-block;
  background: rgba(46,170,114,0.25);
  border: 1px solid rgba(46,170,114,0.6);
  color: var(--green-light);
  font-size: 13px;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero-content h1 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.hero-content .highlight { color: var(--green-light); }
.hero-content p {
  font-size: 16px;
  opacity: 0.88;
  margin-bottom: 30px;
  letter-spacing: 0.5px;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-graphic {
  position: absolute;
  right: calc((100vw - 1200px)/2 + 20px);
  bottom: 0;
  width: 320px;
  opacity: 0.7;
  pointer-events: none;
}
.hero-graphic svg { width: 100%; height: auto; }
.hero-dots {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}
.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.45);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.dot.active { background: var(--white); transform: scale(1.3); }
.hero-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--white);
  width: 44px; height: 44px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  z-index: 10;
}
.hero-arrow:hover { background: rgba(255,255,255,0.3); }
.hero-arrow.prev { left: 20px; }
.hero-arrow.next { right: 20px; }

/* =============================================
   按钮
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 26px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  letter-spacing: 0.3px;
}
.btn-primary {
  background: var(--blue-primary);
  color: var(--white);
  border-color: var(--blue-primary);
}
.btn-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26,111,181,0.35);
}
.btn-secondary {
  background: transparent;
  color: var(--blue-primary);
  border-color: var(--blue-primary);
}
.btn-secondary:hover {
  background: var(--blue-primary);
  color: var(--white);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--white);
}
.btn-white {
  background: var(--white);
  color: var(--blue-primary);
  border-color: var(--white);
}
.btn-white:hover {
  background: var(--blue-pale);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.7);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--white);
}
.btn-link {
  color: var(--blue-primary);
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}
.btn-link:hover { color: var(--blue-dark); gap: 10px; }

/* =============================================
   数据展示条
   ============================================= */
.stats-bar {
  background: linear-gradient(90deg, var(--blue-dark), var(--blue-primary), var(--green-dark));
  padding: 32px 0;
}
.stats-bar .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item { color: var(--white); position: relative; }
.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0; top: 20%; bottom: 20%;
  width: 1px;
  background: rgba(255,255,255,0.2);
}
.stat-number {
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  display: inline-block;
  background: linear-gradient(135deg, #fff, var(--green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-suffix {
  font-size: 22px;
  font-weight: 700;
  color: var(--green-light);
  display: inline-block;
  margin-top: 8px;
}
.stat-label {
  font-size: 14px;
  opacity: 0.85;
  margin-top: 6px;
  letter-spacing: 0.5px;
}

/* =============================================
   通用 Section
   ============================================= */
.section { padding: 80px 0; }
.section-header {
  text-align: center;
  margin-bottom: 52px;
}
.section-tag {
  display: inline-block;
  background: var(--blue-pale);
  color: var(--blue-primary);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%; transform: translateX(-50%);
  width: 50px; height: 3px;
  background: linear-gradient(90deg, var(--blue-primary), var(--green-primary));
  border-radius: 2px;
}
.section-desc {
  font-size: 15px;
  color: var(--gray-500);
  margin-top: 16px;
}
.section-more {
  text-align: center;
  margin-top: 44px;
}

/* =============================================
   产品卡片
   ============================================= */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  position: relative;
  transition: var(--transition);
  overflow: hidden;
}
.product-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-primary), var(--green-primary));
  transform: scaleX(0);
  transition: var(--transition);
}
.product-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-light);
  transform: translateY(-6px);
}
.product-card:hover::before { transform: scaleX(1); }
.product-card.featured {
  border-color: var(--blue-primary);
  box-shadow: 0 4px 20px rgba(26,111,181,0.12);
}
.product-card.featured::before { transform: scaleX(1); }
.product-badge {
  position: absolute;
  top: 16px; right: 16px;
  background: linear-gradient(135deg, var(--blue-primary), var(--green-primary));
  color: var(--white);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  letter-spacing: 0.5px;
}
.product-icon { width: 80px; height: 80px; margin-bottom: 18px; }
.product-icon svg { width: 100%; height: 100%; }
.product-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}
.product-card p {
  font-size: 13.5px;
  color: var(--gray-500);
  line-height: 1.65;
  margin-bottom: 16px;
}
.product-features {
  margin-bottom: 20px;
}
.product-features li {
  font-size: 13px;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 7px;
}
.product-features li i {
  color: var(--green-primary);
  font-size: 11px;
  flex-shrink: 0;
}

/* =============================================
   为什么选择我们
   ============================================= */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.why-item {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}
.why-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--blue-pale);
  transform: translateY(-4px);
}
.why-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
}
.why-icon.blue { background: var(--blue-pale); color: var(--blue-primary); }
.why-icon.green { background: var(--green-pale); color: var(--green-primary); }
.why-icon.teal { background: #e0f7f8; color: var(--teal); }
.why-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--gray-900);
}
.why-item p { font-size: 14px; color: var(--gray-500); line-height: 1.65; }

/* =============================================
   应用场景
   ============================================= */
.app-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}
.app-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition);
}
.app-item:hover {
  border-color: var(--blue-primary);
  background: var(--blue-pale);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.app-icon {
  width: 52px; height: 52px;
  background: var(--blue-pale);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-size: 22px;
  color: var(--blue-primary);
  transition: var(--transition);
}
.app-item:hover .app-icon {
  background: var(--blue-primary);
  color: var(--white);
}
.app-item span {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
}

/* =============================================
   新闻卡片
   ============================================= */
.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.news-card.large {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.news-card.large:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.news-img { height: 200px; overflow: hidden; }
.news-img-placeholder {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}
.news-img-placeholder.blue { background: linear-gradient(135deg, var(--blue-pale), #c5dff5); color: var(--blue-primary); }
.news-card.large .news-content { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.news-card:not(.large) {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.news-card:not(.large):hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.news-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.news-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 10px;
  background: var(--blue-pale);
  color: var(--blue-primary);
  letter-spacing: 0.3px;
}
.news-tag.green { background: var(--green-pale); color: var(--green-dark); }
.news-tag.teal { background: #e0f7f8; color: var(--teal); }
.news-date {
  font-size: 12px;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 5px;
}
.news-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
  line-height: 1.5;
  transition: var(--transition);
}
.news-card:hover h3 { color: var(--blue-primary); }
.news-card p { font-size: 13.5px; color: var(--gray-500); line-height: 1.65; flex: 1; margin-bottom: 16px; }

/* =============================================
   CTA 区域
   ============================================= */
.cta-section {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-primary) 60%, var(--green-dark) 100%);
  padding: 64px 0;
  text-align: center;
}
.cta-content { color: var(--white); }
.cta-content h2 {
  font-size: clamp(22px, 3vw, 36px);
  font-weight: 800;
  margin-bottom: 14px;
}
.cta-content p {
  font-size: 16px;
  opacity: 0.88;
  margin-bottom: 32px;
}
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* =============================================
   页脚
   ============================================= */
.footer {
  background: var(--gray-900);
  color: rgba(255,255,255,0.75);
  padding-top: 56px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-logo {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 14px;
}
.brand-col p {
  font-size: 13.5px;
  line-height: 1.7;
  margin-bottom: 18px;
}
.footer-contact-info p {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 8px;
}
.footer-contact-info i { color: var(--green-light); width: 14px; }
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 30px; height: 2px;
  background: var(--blue-primary);
  border-radius: 2px;
}
.footer-col ul li { margin-bottom: 9px; }
.footer-col ul li a {
  font-size: 13.5px;
  color: rgba(255,255,255,0.65);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--green-light); padding-left: 6px; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  font-size: 12.5px;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 8px;
}

/* =============================================
   关于我们页
   ============================================= */
.page-hero {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-primary) 100%);
  padding: 64px 0;
  color: var(--white);
  text-align: center;
}
.page-hero h1 { font-size: clamp(24px, 3.5vw, 42px); font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 16px; opacity: 0.85; }
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 14px;
  opacity: 0.75;
}
.breadcrumb a:hover { opacity: 1; text-decoration: underline; }
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.about-intro-text h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 8px;
}
.about-intro-text .subtitle {
  color: var(--blue-primary);
  font-weight: 600;
  margin-bottom: 20px;
  font-size: 15px;
}
.about-intro-text p {
  color: var(--gray-500);
  line-height: 1.8;
  font-size: 15px;
  margin-bottom: 14px;
}
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.about-tag {
  background: var(--blue-pale);
  color: var(--blue-primary);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid rgba(26,111,181,0.2);
}
.about-img-box {
  background: linear-gradient(135deg, var(--blue-pale), var(--green-pale));
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}
.about-visual {
  text-align: center;
}
.about-visual .big-icon {
  font-size: 80px;
  color: var(--blue-primary);
  opacity: 0.3;
  margin-bottom: 20px;
}
.about-visual .stats-mini {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-visual .stat-mini {
  background: var(--white);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.about-visual .stat-mini strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--blue-primary);
}
.about-visual .stat-mini span {
  font-size: 12px;
  color: var(--gray-500);
}
.timeline {
  position: relative;
  padding: 20px 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--blue-primary), var(--green-primary));
  transform: translateX(-50%);
}
.timeline-item {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  margin-bottom: 48px;
  position: relative;
}
.timeline-item.right { flex-direction: row-reverse; }
.timeline-year {
  flex: 1;
  text-align: right;
  font-size: 28px;
  font-weight: 800;
  color: var(--blue-primary);
  padding-top: 4px;
}
.timeline-item.right .timeline-year { text-align: left; }
.timeline-dot {
  width: 16px; height: 16px;
  background: var(--blue-primary);
  border-radius: 50%;
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--blue-primary);
  flex-shrink: 0;
  margin-top: 10px;
}
.timeline-content {
  flex: 1;
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}
.timeline-content h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; color: var(--gray-900); }
.timeline-content p { font-size: 13.5px; color: var(--gray-500); }
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.cert-card {
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.cert-card:hover {
  border-color: var(--blue-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.cert-card .cert-icon {
  font-size: 40px;
  color: var(--blue-primary);
  margin-bottom: 14px;
}
.cert-card h4 { font-size: 14px; font-weight: 700; margin-bottom: 6px; color: var(--gray-900); }
.cert-card p { font-size: 12.5px; color: var(--gray-500); }
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.team-card {
  text-align: center;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.team-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.team-avatar {
  width: 80px; height: 80px;
  background: linear-gradient(135deg, var(--blue-pale), var(--green-pale));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 28px;
  color: var(--blue-primary);
}
.team-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.team-card .role { font-size: 13px; color: var(--blue-primary); margin-bottom: 12px; }
.team-card p { font-size: 13px; color: var(--gray-500); }

/* =============================================
   产品页
   ============================================= */
.product-filter {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 44px;
}
.filter-btn {
  padding: 8px 22px;
  border: 2px solid var(--gray-300);
  border-radius: 24px;
  background: var(--white);
  color: var(--gray-700);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--blue-primary);
  background: var(--blue-primary);
  color: var(--white);
}
.products-full-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.product-full-card {
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.product-full-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-light);
  transform: translateY(-5px);
}
.product-card-img {
  height: 180px;
  background: linear-gradient(135deg, var(--blue-pale), var(--green-pale));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 60px;
  color: var(--blue-primary);
  position: relative;
  overflow: hidden;
}
.product-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(26,111,181,0.06));
}
.product-card-body { padding: 22px; }
.product-card-body h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--gray-900); }
.product-card-body p { font-size: 13.5px; color: var(--gray-500); margin-bottom: 14px; line-height: 1.65; }
.product-spec-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}
.spec-tag {
  font-size: 11.5px;
  background: var(--blue-pale);
  color: var(--blue-primary);
  padding: 3px 10px;
  border-radius: 10px;
}

/* =============================================
   新闻页
   ============================================= */
.news-full-grid {
  display: grid;
  grid-template-columns: 7fr 3fr;
  gap: 36px;
}
.news-list .news-list-item {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  transition: var(--transition);
}
.news-list-item:hover { box-shadow: var(--shadow-md); border-color: var(--blue-light); transform: translateX(4px); }
.news-thumb {
  width: 120px; height: 90px;
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--blue-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--blue-primary);
}
.news-item-content h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; line-height: 1.5; transition: var(--transition); }
.news-list-item:hover h3 { color: var(--blue-primary); }
.news-item-content p { font-size: 13px; color: var(--gray-500); line-height: 1.65; margin-bottom: 12px; }
.news-sidebar { position: sticky; top: 100px; }
.sidebar-widget {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}
.sidebar-widget h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--blue-pale);
}
.sidebar-cat-list li { margin-bottom: 10px; }
.sidebar-cat-list li a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--gray-700);
  transition: var(--transition);
}
.sidebar-cat-list li a:hover { color: var(--blue-primary); padding-left: 4px; }
.sidebar-cat-list .count {
  background: var(--blue-pale);
  color: var(--blue-primary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
}
.hot-news-item { display: flex; gap: 12px; margin-bottom: 14px; }
.hot-news-img {
  width: 70px; height: 55px;
  background: var(--blue-pale);
  border-radius: var(--radius);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--blue-primary);
}
.hot-news-info h5 { font-size: 13px; font-weight: 600; margin-bottom: 4px; line-height: 1.4; }
.hot-news-info span { font-size: 11.5px; color: var(--gray-500); }

/* =============================================
   联系页
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: start;
}
.contact-info-cards .info-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  transition: var(--transition);
}
.info-card:hover { box-shadow: var(--shadow-md); border-color: var(--blue-light); }
.info-card .card-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.info-card .card-icon.blue { background: var(--blue-pale); color: var(--blue-primary); }
.info-card .card-icon.green { background: var(--green-pale); color: var(--green-primary); }
.info-card .card-icon.teal { background: #e0f7f8; color: var(--teal); }
.info-card h4 { font-size: 13.5px; color: var(--gray-500); margin-bottom: 4px; }
.info-card p { font-size: 15px; font-weight: 600; color: var(--gray-900); }
.info-card small { font-size: 12px; color: var(--gray-500); }
.contact-form-box {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}
.contact-form-box h3 { font-size: 20px; font-weight: 700; margin-bottom: 24px; color: var(--gray-900); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 7px;
}
.form-group label .required { color: #e53e3e; margin-left: 3px; }
.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--gray-300);
  border-radius: 8px;
  font-size: 14.5px;
  color: var(--gray-700);
  font-family: inherit;
  transition: var(--transition);
  background: var(--white);
}
.form-control:focus {
  outline: none;
  border-color: var(--blue-primary);
  box-shadow: 0 0 0 3px rgba(26,111,181,0.1);
}
textarea.form-control { resize: vertical; min-height: 110px; }
.form-submit { width: 100%; padding: 13px; font-size: 16px; font-weight: 700; letter-spacing: 0.5px; }
.map-box {
  background: linear-gradient(135deg, var(--blue-pale), var(--green-pale));
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  border: 1px solid var(--gray-200);
}
.map-box i { font-size: 64px; color: var(--blue-primary); opacity: 0.4; margin-bottom: 16px; }
.map-box p { color: var(--gray-500); font-size: 15px; }

/* =============================================
   响应式设计
   ============================================= */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .news-grid { grid-template-columns: 1fr; }
  .news-card.large { grid-row: auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .about-intro { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .products-full-grid { grid-template-columns: repeat(2, 1fr); }
  .news-full-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .timeline::before { left: 20px; }
  .timeline-item, .timeline-item.right { flex-direction: column; padding-left: 52px; }
  .timeline-year, .timeline-item.right .timeline-year { text-align: left; }
  .timeline-dot { position: absolute; left: 12px; }
  .timeline-item { position: relative; }
}
@media (max-width: 768px) {
  .top-bar { display: none; }
  .header .container { height: 64px; }
  .logo-cn { font-size: 14px; }
  .logo-en { display: none; }
  .nav {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--white);
    padding: 20px;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--gray-200);
    transform: translateY(-200%);
    opacity: 0;
    transition: var(--transition);
    z-index: 999;
  }
  .nav.open { transform: translateY(0); opacity: 1; }
  .nav ul { flex-direction: column; gap: 4px; }
  .nav ul li a { padding: 12px 16px; border-radius: 8px; }
  .nav-toggle { display: flex; }
  .hero { height: 460px; }
  .hero-content { margin-left: 0; padding: 0 8px; }
  .hero-graphic { display: none; }
  .stats-bar .container { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2)::after { display: none; }
  .products-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .products-full-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form-box { padding: 24px 18px; }
  .hero-arrow { display: none; }
  .section { padding: 56px 0; }
  .news-list .news-list-item { flex-direction: column; }
  .news-thumb { width: 100%; height: 120px; }
}
@media (max-width: 480px) {
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .cert-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
  .stats-bar .container { grid-template-columns: 1fr 1fr; }
}

/* =============================================
   动画
   ============================================= */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease both; }
.fade-in-delay-1 { animation-delay: 0.15s; }
.fade-in-delay-2 { animation-delay: 0.3s; }
.fade-in-delay-3 { animation-delay: 0.45s; }

/* 流水动画 */
@keyframes flow { 0%,100% { transform: translateY(0); opacity: 1; } 50% { transform: translateY(-6px); opacity: 0.5; } }
.particle { animation: flow 2s ease-in-out infinite; }
.p1 { animation-delay: 0s; }
.p2 { animation-delay: 0.5s; }

/* 回到顶部 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 32px;
  width: 44px; height: 44px;
  background: var(--blue-primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  border: none;
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--blue-dark);
  transform: translateY(-3px);
}

/* 产品详情标题锚点 */
.anchor { padding-top: 80px; margin-top: -80px; display: block; }