/* 基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "微软雅黑", sans-serif;
        }

        body {
            color: #333;
            line-height: 1.6;
             display: flex;
            flex-direction: column;
            min-height: 100vh; /* 确保 body 至少占满整个视口高度 */
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        #custom-content{
            flex: 1; /* 占据剩余空间 */
            padding: 100px 20px;
        /* padding: 20px; */
        }

        /* 导航栏 */
        .header {
            background: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }

        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .logo {
            font-size: 20px;
            font-weight: bold;
            color: #0066cc;
        }

        .nav-links {
            display: flex;
            gap: 30px;
        }

        .nav-links a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: #0066cc;
        }

        /* Banner 区 */
        .banner {
            /* background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('https://images.unsplash.com/photo-1581091877018-dac6a371d50f?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1974&q=80'); */
            padding-top: 70px;
            height: 800px;
            position: relative;
            background: 
                linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3));
            background-position: center center;
            background-repeat: no-repeat;
            background-size: contain;
            background-color: #fff; /* 图片未覆盖区域的背景 */
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .banner-content {
            color: #fff;
            max-width: 600px;
        }

        .banner-content h1 {
            color: #333;
            font-size: 25px; 
            margin-bottom: 10px; 
        }

        .banner-content h3 {
            color: #333;
            font-size: 20px; 
            margin-bottom: 10px; 
        }

        .banner-content h4 {
            font-size: 20px;
            text-align: left;
            margin-bottom: 10px;
            color: #333;
        }

        /* 段落首行缩进、左对齐、间隔和行高 */
        .banner-content p,
        .content-section p {
            text-indent: 2em;     /* 首行缩进 */
            text-align: left;     /* 左对齐 */
            font-size: 20px;      /* 文字大小 */
            line-height: 1.8;     /* 行高 */
            margin-bottom: 30px;  /* 段落底部间距 */
            color: #333;
        }


        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: #0066cc;
            color: #fff;
            text-decoration: none;
            border-radius: 5px;
            font-weight: bold;
            transition: background 0.3s;
        }

        .btn:hover {
            background: #0055aa;
        }

        /* 核心优势区 */
        .features {
            padding: 80px 0;
            background: #f8f9fa;
        }

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

        .section-title h1 {
            color: #333;
            font-size: 25px; 
            margin-bottom: 10px; 
        }

        .section-title h2 {
            font-size: 22px;
            color: #0066cc;
            margin-bottom: 20px;
        }

        .section-title h3 {
            color: #333;
            font-size: 20px; 
            margin-bottom: 10px; 
        }

        .section-title h4 {
            font-size: 20px;
            text-align: left;
            margin-bottom: 10px;
            color: #333;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        /* 新增一个更具体的选择器，只作用于加了 .four-cols 的那一组 */
        .feature-grid.four-cols {
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 25px;            /* 减小列间距 */
        }

        .feature-card {
            background: #fff;
            padding: 30px 20px 40px; /* 上 30px，左右 20px，下 40px */
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            text-align: center;
        }

        /* ↓ 新增这一段 ↓ */
        .feature-card p {
            font-size: 15px;    /* 你想要的更小尺寸，比如 12–14px */
            line-height: 1.2;   /* 如果需要也可以微调行高 */
            color: #666;        /* 也可以改成更浅的灰色，突出标题 */
        }


        .feature-icon {
            font-size: 48px;
            color: #0066cc;
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 25px;
            margin-bottom: 15px;
        }

        /* 应用场景区 */
        .applications {
            padding: 80px 0;
        }

        .app-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 200px;
        }

        .app-card {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
            height: 250px;
        }

        .app-card img {
            display: block;       /* 取消默认行内间隙 */
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .app-card:hover img {
            transform: scale(1.05);
        }

        .app-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 20px;
            /* background: rgba(0,0,0,0.7); */
            color: #fff;
        }

        /* 服务支持区 */
        .service {
            padding: 80px 0;
            background: #f8f9fa;
        }

        .service-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .service-item {
            text-align: center;
            padding: 30px;
        }

        .service-icon {
            font-size: 60px;   /* 原来可能是48px，这里改成80px */
            margin-bottom: 15px;
        }


        .service-item i {
            font-size: 48px;
            color: #0066cc;
            margin-bottom: 20px;
        }

        /* 客户案例区 */
        .cases {
            padding: 80px 0;
        }

        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
        }

        .case-logo {
            height: 300px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: #fff;
            border-radius: 10px;
            padding: 10px;
            /* box-shadow: 0 3px 10px rgba(0,0,0,0.1); */
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
        }

        .case-logo:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
        }

        .case-logo img {
            max-width: 100%;
            max-height: 90%;
            /* filter: grayscale(100%); */
            /* transition: filter 0.3s; */
        }

        /* .case-logo:hover img {
            filter: grayscale(0%);
        } */

        
        .modal-content-title {
            font-size: 24px;
            color: #2c3e50;
            margin-bottom: 15px;
            text-align: center;
        }
        .modal-content-image {
            /* width: 100%; */
            display: block; 
            margin: auto;
            max-height: 500px;
            object-fit: cover;
            border-radius: 4px;
            margin-bottom: 20px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }
        .modal-content-description {
            color: #555;
            font-size: 16px;
            margin-bottom: 15px;
            text-indent:2em
        }
        .p-first{
            text-align: left; 
            text-indent:2em
        }
        .ul-style{
            text-align: left;
            padding: 20px 40px;
        }

         .content-section {
            /* padding: 20px; */
            display: none; /* 默认隐藏所有内容区块 */
            flex: 1 0 auto; /* 关键：允许收缩但优先自动拉伸 */
        }

        .content-section-2 {
            /* padding: 20px; */
            display: none; /* 默认隐藏所有内容区块 */
            flex: 1 0 auto; 
        }

        .active {
            display: block; /* 当前激活的内容区块显示 */
        }
        .tech_doc_link{
            min-height: 400px;
            text-align: center;
            display: flex;
            align-items: center;
            justify-content: space-around;
            flex-direction: column;
        }
        /* 底部信息 */
        .footer-bottom {
        background-color: #2d2d2d;
        color: #aaa;
        padding: 1.2rem 5%;
        font-size: 0.9rem;
        border-top: 1px solid rgba(255,255,255,0.1);
        }

        .footer-content {
        max-width: 1200px;
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
        }

        .copyright-info {
        color: #ccc;
        }

        .footer-links a {
        color: #ccc;
        text-decoration: none;
        transition: color 0.2s;
        padding: 0 0.3rem;
        }

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

        .separator {
        color: #555;
        margin: 0 0.2rem;
        user-select: none;
        }

        .jump-button {
            display: inline-block;
            padding: 10px 20px;
            background-color: #3498db;
            color: white;
            text-decoration: none;
            border-radius: 4px;
            transition: background-color 0.3s;
        }
        
        .jump-button:hover {
            background-color: #2980b9;
        }

/* 响应式设计 */
@media (max-width: 768px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 0.8rem;
  }
  
  .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.3rem;
  }
  
  .separator {
    display: none;
  }
}

@media (max-width: 480px) {
  .copyright-info {
    font-size: 0.85rem;
  }
  
  .footer-links a {
    font-size: 0.85rem;
    padding: 0 0.2rem;
  }
}

    .tech-doc-card {
        width: 100%;
        background: white;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        padding: 20px;
        font-family: Arial, sans-serif;
    }

    .tech-doc-card h3 {
        margin-top: 0;
        color: #333;
        border-bottom: 1px solid #eee;
        padding-bottom: 10px;
    }

    .tech-doc-card ul {
        text-align: center;
        list-style: none;
        padding-left: 0;
        margin: 0;
    }

    .tech-doc-card li {
        padding: 8px 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .tech-doc-card li:last-child {
        border-bottom: none;
    }

    .tech-doc-card a {
        text-decoration: none;
        color: #0066cc;
    }

    .tech-doc-card a:hover {
        color: #ff6600;
    }

     /* 卡片容器 */
    .card {
        padding: 20px;
      /* width: 50vw; */
      background: white;
      border-radius: 12px; /* 圆角 */
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); /* 阴影 */
      overflow: hidden; /* 隐藏图片溢出部分 */
      transition: transform 0.3s ease, box-shadow 0.3s ease; /* 悬停动画 */
    }

    /* 悬停效果 */
    /* .card:hover {
      transform: translateY(-8px); 
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    } */

    /* 卡片图片 */
    .card-img {
      height: auto;
      object-fit: cover; /* 图片填充模式 */
        width: 40%;
        display: block;
        margin-left: auto;
        margin-right: auto;
    }

    /* 卡片内容区域 */
    .card-content {
      padding: 20px;
    }

    /* 卡片标题 */
    .card-title {
      font-size: 1.25rem;
      margin-bottom: 10px;
      color: #333;
    }

    /* 卡片描述 */
    .card-desc {
      color: #666;
      font-size: 0.9rem;
      line-height: 1.5;
      margin-bottom: 15px;
    }
    p{
        text-indent: 2em;
    }