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

    :root {
      --nkm-blue: rgb(60 60 59);
      --nkm-orange: #f39e0c;
      --nkm-light: #e8f0f9;
      --nkm-gray: #f5f7fa;
    }

    body {
      min-width: 320px;
    }

    /* 头部导航 */
    header {
      background: var(--nkm-blue);
      padding: 0%;
      position: sticky;
      top: 0;
      z-index: 999;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    }

    .nav {
      max-width: 90%;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 80px;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      background-color: #ffffff;
      height: 80px;
    }

    .logo-img {
      height: 80px;
      width: auto;
      display: block;
      padding: 10px 25px 10px 25px;
    }

    .logo-text {
      color: #fff;
      font-size: 40px;
      font-weight: 600;
      white-space: nowrap;
      margin-left: 10px;
    }

    .nav-menu {
      display: flex;
      gap: 28px;
    }

    .nav-menu a {
      color: #fff;
      text-decoration: none;
      font-size: 16px;
      transition: color 0.3s;
      white-space: nowrap;
    }

    .nav-menu a:hover {
      color: var(--nkm-orange);
    }

    /* 轮播 */
    .banner {
      width: 100%;
      height: auto;
      aspect-ratio: 192/52;
      position: relative;
      overflow: hidden;
      background: var(--nkm-light);
    }

    .banner-slide {
      position: absolute;
      inset: 0;
      opacity: 0;
      transition: opacity 0.8s;
    }

    .banner-slide.active {
      opacity: 1;
    }

    .banner-slide img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .banner-text {
      position: absolute;
      left: 6%;
      top: 50%;
      transform: translateY(-50%);
      color: #ffffff;
      max-width: 600px;
      text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    }

    .banner-text h1 {
      font-size: clamp(24px, 5vw, 42px);
      margin-bottom: 16px;
      line-height: 1.2;
    }

    .banner-text p {
      font-size: clamp(14px, 2vw, 18px);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .banner-btn {
      display: inline-block;
      padding: 12px 30px;
      background: var(--nkm-orange);
      color: #fff;
      text-decoration: none;
      border-radius: 4px;
      font-weight: 500;
    }

    .banner-indicator {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 10px;
    }

    .indicator-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.5);
    }

    .indicator-dot.active {
      background: var(--nkm-orange);
    }

    /* 轮播左右箭头 */
    .carousel-arrow {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(0, 0, 0, 0.3);
      border: none;
      color: #fff;
      font-size: 20px;
      cursor: pointer;
      z-index: 10;
      transition: background 0.3s;
    }

    .carousel-arrow:hover {
      background: var(--nkm-orange);
    }

    .carousel-arrow.prev {
      left: 20px;
    }

    .carousel-arrow.next {
      right: 20px;
    }

    /* 轮播左右箭头 */
    .carousel-arrow {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: rgba(0, 0, 0, 0.25);
      border: none;
      color: #fff;
      font-size: 22px;
      cursor: pointer;
      z-index: 10;
      transition: all 0.3s;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .carousel-arrow:hover {
      background: var(--nkm-orange);
    }

    .carousel-arrow.prev {
      left: 20px;
    }

    .carousel-arrow.next {
      right: 20px;
    }

    /* 小圆点手指样式 */
    .indicator-dot {
      cursor: pointer;
    }

    /* 通用容器 */
    .container {
      max-width: 90%;
      margin: 0 auto;
      padding: 60px 3%;
    }

    .section-title {
      text-align: center;
      font-size: clamp(22px, 4vw, 32px);
      color: var(--nkm-blue);
      margin-bottom: 10px;
    }

    .section-title::after {
      content: "";
      display: block;
      width: 50px;
      height: 3px;
      background: var(--nkm-orange);
      margin: 10px auto 30px;
    }

    /* 产品 */
    .products {
      background: #fff;
    }

    .product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 60px;
    }

    .product-item {
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
      transition: transform 0.3s;
    }

    .product-item:hover {
      transform: translateY(-4px);
    }

    .product-item img {
      width: 100%;
      height: 290px;
      object-fit: cover;
      background: var(--nkm-light);
      display: block;
    }

    .product-item h3 {
      padding: 16px;
      color: var(--nkm-blue);
      font-size: 18px;
    }

    .product-item p {
      padding: 0 16px 20px;
      color: #666;
      font-size: 14px;
      line-height: 1.6;
    }

    /* 轮播箭头 */
    .carousel-arrow {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: rgba(0, 0, 0, 0.3);
      border: none;
      color: #fff;
      font-size: 24px;
      cursor: pointer;
      z-index: 9999;
      /* 提高层级保证能点到 */
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.3s;
    }

    .carousel-arrow:hover {
      background: var(--nkm-orange);
    }

    .arrow-prev {
      left: 20px;
    }

    .arrow-next {
      right: 20px;
    }

    /* 小圆点 */
    .indicator-dot {
      cursor: pointer;
    }

    /* 关于 */
    .about {
      background: var(--nkm-gray);
    }

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

    .about-col {
      flex: 1;
      min-width: 300px;
    }

    .about-col img {
      height: auto;
      width: 100%;
      border-radius: 8px;
      display: block;
    }

    .about-col p {
      line-height: 1.8;
      color: #333;
      margin-bottom: 14px;
    }

    /* 服务 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 30px;
      text-align: center;
    }

    .service-item {
      padding: 24px;
      border: 1px solid var(--nkm-light);
      border-radius: 8px;
    }

    .service-item h3 {
      color: var(--nkm-blue);
      margin: 10px 0;
    }

    /* 底部信息 */
    .footer-top {
      background: var(--nkm-blue);
      color: #fff;
    }

    .footer-row {
      max-width: 1400px;
      margin: 0 auto;
      padding: 50px 5%;
      display: flex;
      flex-wrap: wrap;
      gap: 50px;
    }

    .footer-col {
      flex: 1;
      min-width: 260px;
    }

    .footer-col h4 {
      font-size: 20px;
      margin-bottom: 20px;
      padding-bottom: 10px;
      border-bottom: 2px solid var(--nkm-orange);
      display: inline-block;
    }

    .footer-col p {
      margin-bottom: 10px;
      line-height: 1.7;
    }

    .footer-col a {
      color: #fff;
      text-decoration: none;
    }

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

    footer {
      background: var(--nkm-blue);
      color: rgba(255, 255, 255, 0.7);
      text-align: center;
      padding: 20px 5%;
      font-size: 14px;
    }

    /* 关于部分 2×2 LOGO 网格布局 */
    .about-logo-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      grid-template-rows: repeat(2, 1fr);
      gap: 16px;
      /* 图片之间的间距 */
    }

    .about-logo-grid img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      /* 保证LOGO不变形，完整显示 */
      background: #ffffff;
      border-radius: 4px;
      padding: 6px;
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
    }

    /* 响应式适配：小屏幕自动变成单列 */
    @media (max-width: 768px) {
      .about-row {
        flex-direction: column;
      }

      .about-logo-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(2, auto);
      }
    }

    .NKM-a {
      text-decoration: none;
    }