* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: "Microsoft YaHei", sans-serif;
      scroll-behavior: smooth;
    }

    /* 匹配LOGO主色调：深蓝+大红+白色 */
    :root {
      --primary: #003399; /* LOGO深蓝 */
      --secondary: #e60000; /* LOGO大红 */
      --light: #f8f9fa;
      --dark: #202124;
      --gray: #5f6368;
    }

    body {
      color: var(--dark);
      line-height: 1.7;
    }

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

    ul {
      list-style: none;
    }

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

    .container {
      width: 92%;
      max-width: 1200px;
      margin: 0 auto;
    }

    /* 导航栏 - 适配LOGO展示 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #fff;
      box-shadow: 0 2px 10px rgba(0,0,0,0.08);
      z-index: 999;
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 85px; /* 加高适配LOGO */
    }

    .logo-container {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-img {
      height: 60px; /* LOGO高度 */
      width: auto;
    }

    .logo-text {
      font-size: 18px;
      font-weight: bold;
      color: var(--primary);
      line-height: 1.2;
    }

    .logo-text span {
      color: var(--secondary);
    }

    .nav-menu {
      display: flex;
      gap: 32px;
    }

    .nav-menu a {
      font-weight: 500;
      transition: 0.3s;
    }

    .nav-menu a:hover {
      color: #003399;
    }

    .menu-btn {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary);
    }

    /* Banner - 适配品牌色调 */
    .banner {
      /*margin-top: 85px;*/
      height: 600px;
      background: linear-gradient(rgba(0,51,153,0.05), rgba(230,0,0,0.05)), center/cover no-repeat;
      display: flex;
      align-items: center;
      color: #222;
    }

    .banner-content {
      max-width: 650px;
    }

    .banner h1 {
      font-size: 42px;
      margin-bottom: 20px;
      line-height: 1.3;
      color: var(--primary);
    }

    .banner h1 span {
      color: var(--secondary);
    }

    .banner p {
      font-size: 18px;
      color: var(--gray);
      margin-bottom: 30px;
    }

    .btn {
      display: inline-block;
      padding: 12px 30px;
      background: var(--secondary);
      color: #fff;
      border-radius: 50px;
      transition: 0.3s;
      font-weight: 500;
      border: none;
      cursor: pointer;
    }

    .btn:hover {
      background: #c00000;
      transform: translateY(-2px);
    }

    /* 通用板块样式 */
    .section {
      padding: 80px 0;
    }

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

    .section-title h2 {
      font-size: 32px;
      position: relative;
      display: inline-block;
      padding-bottom: 12px;
      color: var(--primary);
    }

    .section-title h2::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background: var(--secondary);
      border-radius: 3px;
    }

    .section-title p {
      color: var(--gray);
      margin-top: 12px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 关于我们 */
    .about {
      background: var(--light);
    }

    .about-row {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .about-img, .about-text {
      flex: 1;
      min-width: 300px;
    }

    .about-text h3 {
      font-size: 24px;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .about-text h3 span {
      color: var(--secondary);
    }

    .about-text p {
      color: var(--gray);
      margin-bottom: 12px;
    }

    /* 业务范围板块 */
    .business {
      background: #fff;
    }

    .business-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      gap: 25px;
    }

    .business-card {
      background: var(--light);
      padding: 30px 20px;
      border-radius: 12px;
      text-align: center;
      transition: 0.3s;
      border-top: 4px solid var(--primary);
    }

    .business-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }

    .business-card i {
      font-size: 36px;
      color: var(--secondary);
      margin-bottom: 15px;
    }

    .business-card h4 {
      font-size: 18px;
      margin-bottom: 10px;
      color: var(--primary);
    }

    .business-card p {
      font-size: 14px;
      color: var(--gray);
    }

    /* 产品中心 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
      gap: 30px;
    }

    .product-card {
      background: #fff;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 3px 15px rgba(0,0,0,0.06);
      transition: 0.3s;
      border-top: 3px solid var(--primary);
    }

    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    }

    .product-img {
      height: 380px;
    }

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

    .product-info {
      padding: 20px;
    }

    .product-info h4 {
      font-size: 18px;
      margin-bottom: 8px;
      color: var(--primary);
    }

    .product-info p {
      color: var(--gray);
      font-size: 14px;
    }

    /* 新闻资讯 */
    .news {
      background: var(--light);
    }

    .news-list {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(350px,1fr));
      gap: 30px;
    }

    .news-item {
      background: #fff;
      border-radius: 12px;
      overflow: hidden;
      border-left: 3px solid var(--secondary);
    }

    .news-date {
      padding: 10px 20px;
      background: var(--primary);
      color: #fff;
      font-size: 14px;
    }

    .news-content {
      padding: 20px;
    }

    .news-content h4 {
      margin-bottom: 10px;
      color: var(--primary);
    }

    .news-content p {
      color: var(--gray);
      font-size: 14px;
    }

    /* 联系我们 */
    .contact-row {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }

    .contact-info, .contact-form {
      flex: 1;
      min-width: 300px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 15px;
      margin-bottom: 25px;
    }

    .contact-item i {
      font-size: 22px;
      color: var(--secondary);
      margin-top: 5px;
    }

    .contact-item h4 {
      margin-bottom: 4px;
      color: var(--primary);
    }

    .contact-item p {
      color: var(--gray);
    }

    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 15px;
      border: 1px solid #ddd;
      border-radius: 8px;
      outline: none;
      font-size: 15px;
      transition: 0.3s;
    }

    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(0,51,153,0.1);
    }

    .contact-form textarea {
      height: 150px;
      resize: none;
    }

    /* 底部 */
    footer {
      background: var(--primary);
      color: #fff;
      padding: 50px 0 20px;
    }

    .footer-top {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      margin-bottom: 30px;
    }

    .footer-col {
      flex: 1;
      min-width: 220px;
    }

    .footer-col h3 {
      font-size: 18px;
      margin-bottom: 20px;
      color: #fff;
      border-bottom: 2px solid var(--secondary);
      padding-bottom: 8px;
      display: inline-block;
    }

    .footer-col p, .footer-col li {
      color: #e0e0e0;
      font-size: 14px;
      margin-bottom: 8px;
    }

    .footer-col a:hover {
      color: var(--secondary);
    }

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.2);
      color: #ccc;
      font-size: 14px;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .nav-menu {
        position: fixed;
        top: 85px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 85px);
        background: #fff;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.4s;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
      }
      .nav-menu.active {
        left: 0;
      }
      .menu-btn {
        display: block;
      }
      .banner h1 {
        font-size: 32px;
      }
      .logo-text {
        display: none; /* 移动端隐藏文字，只显示LOGO */
      }
    }

    @media (max-width: 768px) {
      .banner {
        height: 450px;
      }
      .section {
        padding: 60px 0;
      }
      .logo-img {
        height: 50px;
      }
      .business-grid {
        grid-template-columns: 1fr;
      }
    }