/* ============================================
   廊坊津发线缆有限公司 - 企业官网样式
   ============================================ */

/* CSS 变量 */
:root {
  --primary: #1a3a5c;
  --primary-light: #2c5282;
  --primary-dark: #0f2942;
  --accent: #d4252c;
  --accent-light: #e53e3e;
  --accent-dark: #b01e24;
  --text-dark: #1a1a2e;
  --text-medium: #555;
  --text-light: #888;
  --bg-white: #ffffff;
  --bg-light: #f7f9fb;
  --bg-gray: #eef2f5;
  --border-color: #e0e6ed;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --transition: all 0.3s ease;
  --radius: 8px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --header-height: 72px;
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

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

/* 通用标题 */
.section-title {
  text-align: center;
  margin-bottom: 12px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
}

.section-title .subtitle {
  display: block;
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 8px;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.section-title .divider {
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* ============================================
   头部导航
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text .name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
}

.logo-text .en {
  font-size: 0.65rem;
  color: var(--text-light);
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* 导航菜单 */
.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  padding: 8px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-dark);
  border-radius: 6px;
  position: relative;
}

.nav a:hover {
  color: var(--primary);
}

.nav a.active {
  color: var(--primary);
  font-weight: 600;
}

.nav a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* 语言切换按钮 */
.nav-sep {
  display: inline-block;
  width: 1px;
  height: 20px;
  background: var(--border-color);
  margin: 0 8px;
}

.lang-btn {
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  border-radius: 4px;
  transition: var(--transition);
  user-select: none;
}

.lang-btn:hover {
  color: var(--primary);
  background: rgba(26, 58, 92, 0.06);
}

.lang-btn.active {
  color: var(--primary);
  font-weight: 600;
  background: rgba(26, 58, 92, 0.08);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(212, 37, 44, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
}

.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(to top, var(--bg-white), transparent);
  z-index: 1;
}

.hero-bg-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 700px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(212, 37, 44, 0.9);
  border-radius: 30px;
  font-size: 0.85rem;
  letter-spacing: 2px;
  margin-bottom: 24px;
  font-weight: 500;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.hero h1 .highlight {
  color: #ffd700;
}

.hero .desc {
  font-size: 1.15rem;
  line-height: 1.8;
  margin-bottom: 36px;
  opacity: 0.85;
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 1px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212, 37, 44, 0.35);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
  transform: translateY(-2px);
}

.btn-dark {
  background: var(--primary);
  color: #fff;
}

.btn-dark:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 58, 92, 0.35);
}

/* ============================================
   通用 Section
   ============================================ */
.section {
  padding: 80px 0;
}

.section-light {
  background: var(--bg-light);
}

/* ============================================
   首页 - 公司简介
   ============================================ */
.intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.intro-image {
  position: relative;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  box-shadow: var(--shadow-lg);
}

.intro-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, rgba(255, 255, 255, 0.1) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.1) 25%, transparent 25%);
  background-size: 30px 30px;
}

.intro-image-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.9);
  text-align: center;
  padding: 40px;
}

.intro-image-content .icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.intro-image-content h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.intro-image-content p {
  font-size: 0.95rem;
  opacity: 0.8;
}

.intro-text h2 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 8px;
  font-weight: 700;
}

.intro-text .en-title {
  font-size: 0.85rem;
  color: var(--text-light);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.intro-text .divider {
  width: 50px;
  height: 3px;
  background: var(--accent);
  margin-bottom: 24px;
  border-radius: 2px;
}

.intro-text p {
  color: var(--text-medium);
  line-height: 1.9;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.intro-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 28px 0;
}

.intro-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-dark);
  font-weight: 500;
}

.intro-feature .check {
  width: 22px;
  height: 22px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.7rem;
  flex-shrink: 0;
}

/* ============================================
   首页 - 产品概览
   ============================================ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.product-card-image {
  height: 200px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-card-image img {
  transform: scale(1.08);
}

.product-card-body {
  padding: 24px;
}

.product-card-body h3 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 8px;
  font-weight: 600;
}

.product-card-body p {
  font-size: 0.88rem;
  color: var(--text-medium);
  line-height: 1.7;
  margin-bottom: 16px;
}

.product-card-link {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.product-card-link:hover {
  gap: 12px;
  color: var(--accent-dark);
}

/* ============================================
   核心优势
   ============================================ */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.advantage-card {
  text-align: center;
  padding: 36px 20px;
  border-radius: var(--radius-lg);
  background: #fff;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.advantage-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  transition: var(--transition);
}

.advantage-card:hover .advantage-icon {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  transform: scale(1.1);
}

.advantage-card h3 {
  font-size: 1.1rem;
  color: var(--primary);
  margin-bottom: 10px;
  font-weight: 600;
}

.advantage-card p {
  font-size: 0.85rem;
  color: var(--text-medium);
  line-height: 1.7;
}

/* ============================================
   数据统计
   ============================================ */
.stats {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  position: relative;
  overflow: hidden;
}

.stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1' fill='%23ffffff' fill-opacity='0.1'/%3E%3C/svg%3E");
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  position: relative;
  z-index: 1;
}

.stat-item {
  text-align: center;
  padding: 20px;
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: #ffd700;
  line-height: 1;
  margin-bottom: 12px;
}

.stat-number .unit {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.8);
}

.stat-label {
  font-size: 0.95rem;
  opacity: 0.8;
  letter-spacing: 2px;
}

/* ============================================
   CTA 区域
   ============================================ */
.cta {
  background: var(--bg-light);
  text-align: center;
  padding: 70px 0;
}

.cta-content h2 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 16px;
  font-weight: 700;
}

.cta-content p {
  font-size: 1rem;
  color: var(--text-medium);
  margin-bottom: 32px;
}

/* ============================================
   页面 Banner
   ============================================ */
.page-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
  padding: calc(var(--header-height) + 60px) 0 60px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 30% 50%, rgba(212, 37, 44, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
}

.page-banner::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(to top, var(--bg-white), transparent);
}

.page-banner-content {
  position: relative;
  z-index: 1;
}

.page-banner h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 3px;
}

.page-banner .breadcrumb {
  font-size: 0.9rem;
  opacity: 0.7;
  letter-spacing: 1px;
}

.page-banner .breadcrumb a:hover {
  color: #ffd700;
}

.page-banner .breadcrumb span {
  margin: 0 8px;
}

/* ============================================
   关于我们 - 公司介绍
   ============================================ */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-intro-image {
  height: 420px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-intro-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, rgba(255, 255, 255, 0.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.08) 25%, transparent 25%);
  background-size: 40px 40px;
}

.about-intro-image .content {
  text-align: center;
  color: rgba(255, 255, 255, 0.9);
  z-index: 1;
  position: relative;
}

.about-intro-image .content .big-num {
  font-size: 5rem;
  font-weight: 700;
  color: #ffd700;
  line-height: 1;
}

.about-intro-image .content .label {
  font-size: 1.1rem;
  margin-top: 12px;
  letter-spacing: 3px;
}

.about-intro-text h2 {
  font-size: 1.8rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.about-intro-text .en {
  font-size: 0.85rem;
  color: var(--text-light);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.about-intro-text .divider {
  width: 50px;
  height: 3px;
  background: var(--accent);
  margin-bottom: 24px;
  border-radius: 2px;
}

.about-intro-text p {
  color: var(--text-medium);
  line-height: 1.9;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

/* 发展历程 */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 50px auto 0;
  padding: 20px 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--border-color), transparent);
  transform: translateX(-50%);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 80px 1fr;
  gap: 0;
  margin-bottom: 40px;
  align-items: center;
}

.timeline-item .timeline-content {
  padding: 24px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.timeline-item .timeline-content:hover {
  box-shadow: var(--shadow-md);
  transform: scale(1.02);
}

.timeline-item .timeline-content h4 {
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 600;
}

.timeline-item .timeline-content p {
  color: var(--text-medium);
  font-size: 0.9rem;
  line-height: 1.7;
}

.timeline-item .timeline-dot {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  margin: 0 auto;
  border: 4px solid #fff;
  box-shadow: 0 0 0 2px var(--accent);
  z-index: 1;
}

.timeline-item:nth-child(odd) .timeline-content {
  grid-column: 1;
  text-align: right;
}

.timeline-item:nth-child(odd) > div:last-child {
  grid-column: 3;
}

.timeline-item:nth-child(even) .timeline-content {
  grid-column: 3;
}

.timeline-item:nth-child(even) > div:first-child {
  grid-column: 1;
}

/* 企业文化 */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.culture-card {
  text-align: center;
  padding: 40px 30px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.culture-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.culture-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
}

.culture-card:nth-child(2) .culture-icon {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
}

.culture-card:nth-child(3) .culture-icon {
  background: linear-gradient(135deg, #2d3748, #4a5568);
}

.culture-card h3 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 600;
}

.culture-card p {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.8;
}

/* 资质认证 */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 50px;
}

.cert-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px 20px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.cert-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.cert-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.cert-item h4 {
  font-size: 0.95rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 6px;
}

.cert-item p {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ============================================
   产品页面
   ============================================ */
.products-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 50px;
}

.product-detail {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.product-detail:hover {
  box-shadow: var(--shadow-md);
}

.product-detail:nth-child(even) {
  grid-template-columns: 1fr 300px;
}

.product-detail:nth-child(even) .product-detail-image {
  order: 2;
}

.product-detail-image {
  height: 100%;
  min-height: 240px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-detail-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

.product-detail-body {
  padding: 32px;
}

.product-detail-body .tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--bg-gray);
  color: var(--primary);
  font-size: 0.75rem;
  border-radius: 20px;
  margin-bottom: 12px;
  font-weight: 600;
  letter-spacing: 1px;
}

.product-detail-body h3 {
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.product-detail-body .desc {
  color: var(--text-medium);
  font-size: 0.92rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.product-features-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.product-features-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dark);
}

.product-features-list li::before {
  content: "▶";
  color: var(--accent);
  font-size: 0.7rem;
}

/* ============================================
   联系我们
   ============================================ */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  margin-top: 50px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.contact-info-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

.contact-info-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #fff;
  flex-shrink: 0;
}

.contact-info-item:nth-child(2) .contact-info-icon {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
}

.contact-info-item:nth-child(3) .contact-info-icon {
  background: linear-gradient(135deg, #1a6837, #2d8f4e);
}

.contact-info-item:nth-child(4) .contact-info-icon {
  background: linear-gradient(135deg, #2d3748, #4a5568);
}

.contact-info-text h4 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 6px;
  font-weight: 600;
}

.contact-info-text p {
  font-size: 0.92rem;
  color: var(--text-medium);
  line-height: 1.6;
}

/* 联系表单 */
.contact-form-wrapper {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.contact-form-wrapper h3 {
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 8px;
  font-weight: 700;
}

.contact-form-wrapper .form-desc {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-dark);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group label .required {
  color: var(--accent);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-submit {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
}

/* 地图区域 */
.map-section {
  margin-top: 50px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  height: 360px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
  position: relative;
}

.map-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.map-section .map-placeholder {
  position: relative;
  z-index: 1;
}

.map-section .map-placeholder .icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.map-section .map-placeholder p {
  font-size: 1rem;
  letter-spacing: 2px;
}

/* ============================================
   页脚
   ============================================ */
.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: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 20px;
}

.footer-brand .logo-text .name {
  color: #fff;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a,
.footer-social span {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
  cursor: default;
  pointer-events: none;
}

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 20px;
  font-weight: 600;
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: #fff;
  padding-left: 6px;
}

.footer-contact-item {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  align-items: flex-start;
}

.footer-contact-item .icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 0.82rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ============================================
   面包屑导航 - SEO优化
   ============================================ */
.breadcrumb {
  background: var(--bg-light);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.breadcrumb .container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb .separator {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin: 0 4px;
}

.breadcrumb .current {
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 500;
}

/* 结构化数据 - 面包屑 JSON-LD */
.breadcrumb-list {
  display: none;
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.animate-fade-up {
  animation: fadeInUp 0.8s ease both;
}

.animate-fade {
  animation: fadeIn 0.8s ease both;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* 回到顶部 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  border: none;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-4px);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    gap: 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-150%);
    transition: var(--transition);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .nav.active {
    transform: translateY(0);
  }

  .nav a {
    width: 100%;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
  }

  .nav a.active::after {
    display: none;
  }

  .nav .nav-sep {
    display: none;
  }

  .nav .lang-btn {
    width: 100%;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    text-align: left;
    font-size: 0.95rem;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--header-height) + 40px) 0 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .desc {
    font-size: 1rem;
  }

  .section {
    padding: 50px 0;
  }

  .section-title h2 {
    font-size: 1.6rem;
  }

  .intro,
  .about-intro {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .intro-image,
  .about-intro-image {
    height: 280px;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .stat-number {
    font-size: 2.2rem;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .product-detail,
  .product-detail:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .product-detail:nth-child(even) .product-detail-image {
    order: 0;
  }

  .product-detail-image {
    min-height: 180px;
  }

  .product-features-list {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .page-banner h1 {
    font-size: 1.8rem;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    grid-template-columns: 40px 1fr;
  }

  .timeline-item .timeline-dot {
    margin: 0;
  }

  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    grid-column: 2;
    text-align: left;
  }

  .timeline-item > div:first-child,
  .timeline-item > div:last-child {
    display: none;
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }

  .contact-form-wrapper {
    padding: 24px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .logo-text .en {
    display: none;
  }
}