/* 基础重置 + 全局基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft YaHei", sans-serif;
        }
        body {
            background: #f7f9fb;
            color: #333;
            line-height: 1.6;
        }
        /* 容器：内容区居中，仅限制最大宽度 */
        .ca-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        /* Banner 区域：全屏顶格，宽屏大气设计 */
        .ca-banner {
            width: 100%;
            height: 605px;
            background: url("/static/index/picture/qtk_banner.jpg") center top no-repeat;
            background-size: cover;
            display: flex;
            align-items: center;
            position: relative;
            margin: 0;
            padding: 0;
        }
        .ca-banner::after {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
        }
        .ca-banner .ca-banner-content {
            position: relative;
            z-index: 2;
            color: #fff;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 30px;
        }
        .ca-banner h1 {
            font-size: 48px;
            margin-bottom: 20px;
            font-weight: 700;
            line-height: 1.2;
        }
        .ca-banner p {
            font-size: 20px;
            max-width: 700px;
            margin-bottom: 30px;
            line-height: 1.8;
        }
        .ca-banner a {
            display: inline-block;
            background: #0d4b8e;
            color: #fff;
            padding: 15px 40px;
            border-radius: 4px;
            text-decoration: none;
            font-size: 18px;
            font-weight: 500;
            transition: background 0.3s ease;
        }
        .ca-banner a:hover {
            background: #0a3c70;
        }
        /* 通用板块样式 */
        .ca-section {
            padding: 80px 0;
            width: 100%;
        }
        .ca-section-title {
            text-align: center;
            font-size: 32px;
            color: #222;
            margin-bottom: 50px;
            position: relative;
            font-weight: 700;
        }
        .ca-section-title::after {
            content: "";
            width: 80px;
            height: 4px;
            background: #0d4b8e;
            position: absolute;
            left: 50%;
            bottom: -15px;
            transform: translateX(-50%);
        }
        /* 应用场景板块 */
        .ca-scene-box {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .ca-scene-item {
            background: #fff;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease;
        }
        .ca-scene-item:hover {
            transform: translateY(-5px);
        }
        .ca-scene-item img {
            width: 100%;
            height: 220px;
            object-fit: cover; /* 场景图裁剪适配，保证视觉效果 */
        }
        .ca-scene-item .ca-text {
            padding: 25px;
        }
        .ca-scene-item h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: #222;
            font-weight: 600;
        }
        .ca-scene-item p {
            font-size: 15px;
            color: #666;
            line-height: 1.8;
        }
        /* 核心优势板块（深色背景对比） */
        .ca-advantage {
            background: #edf2f9;
            padding: 80px 0;
        }
        .ca-adv-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
            text-align: center;
        }
        .ca-adv-item {
            background: #fff;
            padding: 40px 25px;
            border-radius: 10px;
            box-shadow: 0 3px 12px rgba(0, 0, 0, 0.05);
        }
        .ca-adv-item h3 {
            font-size: 18px;
            margin: 15px 0;
            color: #222;
            font-weight: 600;
        }
        .ca-adv-item p {
            font-size: 14px;
            color: #666;
            line-height: 1.7;
        }
        /* 规格参数板块（宽屏表格） */
        .ca-specs {
            background: #fff;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
        }
        .ca-specs-table {
            width: 100%;
            border-collapse: collapse;
        }
        .ca-specs-table th {
            background: #edf2f9;
            color: #222;
            font-size: 16px;
            font-weight: 600;
            padding: 18px 20px;
            text-align: left;
            border-bottom: 2px solid #eee;
        }
        .ca-specs-table td {
            padding: 18px 20px;
            color: #666;
            font-size: 15px;
            border-bottom: 1px solid #eee;
        }
        .ca-specs-table tr:last-child td {
            border-bottom: none;
        }
        /* 细节展示图（宽屏） */
        .ca-img-box {
            width: 100%;
            margin: 40px 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
        }
        .ca-img-box img {
            display: block;
            width: 100%;
            height: auto;
            object-fit: contain; /* 细节图完整显示，不裁剪 */
        }
        /* 响应式适配 */
        @media (max-width: 992px) {
            .ca-banner h1 {
                font-size: 36px;
            }
            .ca-banner p {
                font-size: 18px;
            }
            .ca-scene-box {
                grid-template-columns: repeat(2, 1fr);
            }
            .ca-adv-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .ca-section {
                padding: 60px 0;
            }
        }
        @media (max-width: 576px) {
            .ca-banner {
                height: 580px;
            }
            .ca-banner h1 {
                font-size: 28px;
            }
            .ca-banner p {
                font-size: 16px;
            }
            .ca-banner a {
                padding: 12px 30px;
                font-size: 16px;
            }
            .ca-scene-box, .ca-adv-list {
                grid-template-columns: 1fr;
            }
            .ca-section-title {
                font-size: 26px;
            }
            .ca-specs {
                padding: 20px;
            }
        }