/* ==================== 基础变量 ==================== */
:root {
  --primary: #0056b3;
  --primary-dark: #003d80;
  --primary-light: #e6f0fa;
  --accent: #00a8e8;
  --text: #333333;
  --text-light: #666666;
  --bg: #ffffff;
  --bg-light: #f5f7fa;
  --border: #e0e4e8;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --radius: 8px;
  --max-width: 1200px;
  --header-height: 72px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
}

a {
  text-decoration: none;
  color: inherit;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.section-title p {
  font-size: 16px;
  color: var(--text-light);
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

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

/* ==================== 头部导航 ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  z-index: 1000;
}

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

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

.logo img {
  height: 44px;
  width: auto;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.nav ul {
  display: flex;
  list-style: none;
  gap: 36px;
}

.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: color 0.3s;
  position: relative;
}

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

.nav a::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s;
}

.nav a:hover::after,
.nav a.active::after {
  width: 100%;
}

/* 头部操作区（语言切换 + 移动端菜单） */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.language-switcher {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg-light);
  border-radius: 20px;
  border: 1px solid var(--border);
}

.lang-btn {
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s;
  font-family: inherit;
}

.lang-btn:hover {
  color: var(--primary);
}

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

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

/* ==================== Banner ==================== */
.banner {
  position: relative;
  height: 600px;
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--accent) 100%);
  display: flex;
  align-items: center;
  color: #fff;
  overflow: hidden;
}

.banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 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='0.05'%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");
  opacity: 0.4;
}

.banner .container {
  position: relative;
  z-index: 2;
}

.banner-content {
  max-width: 700px;
}

.banner-content h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}

.banner-content p {
  font-size: 20px;
  margin-bottom: 32px;
  opacity: 0.95;
}

.banner-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.banner-btns .btn-outline {
  border-color: #fff;
  color: #fff;
}

.banner-btns .btn-outline:hover {
  background: #fff;
  color: var(--primary);
}

/* ==================== 公司简介 ==================== */
.about-section {
  background: var(--bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-content h2 {
  font-size: 32px;
  margin-bottom: 20px;
}

.about-content p {
  color: var(--text-light);
  margin-bottom: 16px;
  text-align: justify;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.stat-item {
  text-align: center;
  padding: 20px;
  background: var(--bg-light);
  border-radius: var(--radius);
}

.stat-item .number {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.stat-item .label {
  font-size: 14px;
  color: var(--text-light);
}

/* ==================== 产品中心 ==================== */
.products-section {
  background: var(--bg-light);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.product-image {
  height: 200px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
}

.product-image img {
  max-height: 100%;
  max-width: 100%;
  object-fit: contain;
}

.product-info {
  padding: 24px;
}

.product-info h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text);
  word-break: break-word;
  overflow-wrap: break-word;
}

.product-info p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

/* ==================== 解决方案 ==================== */
.solutions-section {
  background: var(--bg);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.solution-card {
  padding: 36px 28px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: all 0.3s;
}

.solution-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.solution-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--primary);
}

.solution-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  word-break: break-word;
  overflow-wrap: break-word;
}

.solution-card p {
  font-size: 14px;
  color: var(--text-light);
}

/* ==================== 资质荣誉 ==================== */
.honors-section {
  background: var(--bg-light);
}

.honors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}

.honor-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

.honor-card img {
  max-height: 160px;
  margin: 0 auto 16px;
  object-fit: contain;
}

.honor-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.honor-card p {
  font-size: 13px;
  color: var(--text-light);
}

/* ==================== 联系我们 ==================== */
.contact-section {
  background: var(--bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}

.contact-info h3 {
  font-size: 24px;
  margin-bottom: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 20px;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 14px;
  color: var(--text-light);
}

.contact-form {
  background: var(--bg-light);
  padding: 36px;
  border-radius: var(--radius);
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

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

/* ==================== 页脚 ==================== */
.footer {
  background: #1a1f2b;
  color: #aeb4c2;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img {
  height: 40px;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
}

.footer-title {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
  word-break: break-word;
  overflow-wrap: break-word;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 14px;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid #2d3546;
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
}

/* ==================== 内页通用 ==================== */
.page-banner {
  height: 280px;
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
}

.page-banner h1 {
  font-size: 40px;
  margin-bottom: 10px;
}

.page-banner p {
  font-size: 16px;
  opacity: 0.9;
}

.content-section {
  padding: 60px 0;
}

.content-section h2 {
  font-size: 28px;
  margin-bottom: 20px;
  color: var(--text);
}

.content-section p {
  color: var(--text-light);
  margin-bottom: 16px;
  text-align: justify;
}

.timeline {
  position: relative;
  padding-left: 30px;
  margin-top: 30px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
}

.timeline-item .year {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.timeline-item p {
  margin-bottom: 0;
}

/* ==================== 响应式 ==================== */
@media (max-width: 992px) {
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    padding: 20px;
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    z-index: 999;
  }

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

  .nav ul {
    flex-direction: column;
    gap: 16px;
  }

  .header-actions {
    margin-left: auto;
    gap: 12px;
  }

  .language-switcher {
    padding: 3px;
  }

  .lang-btn {
    padding: 5px 10px;
    font-size: 12px;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .banner {
    height: 500px;
  }

  .banner-content h1 {
    font-size: 32px;
  }

  .banner-content p {
    font-size: 16px;
  }

  .section-title h2 {
    font-size: 26px;
  }

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

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

  .page-banner h1 {
    font-size: 30px;
  }
}