/*
     * 基础样式复用您之前提供的样式结构，确保页面风格一致性。
     */
    /* ------------------------ 通用字体和颜色变量 ------------------------------------- */
    :root {
        --primary-color: #0f403f;
        --text-color-light: #ffffff;
    }

    body, h1, h2, h3, p, ul, li {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
        color: #333;
    }

    /* 容器居中与内边距 */
    .section-container {
        max-width: 1400px;
        margin: 0 auto;
        padding: 20px 20px;
    }

    /* ------------------------ 1. Banner 样式 ------------------------------------- */
    .banner-container {
        position: relative;
        width: 100%;
        min-height: 250px;
        color: #ffffff;
        overflow: hidden;
    }

    .banner-container::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.2);
        z-index: 1;
        pointer-events: none;
    }

    /* 确保 banner-image 应用于 <picture> 内的 <img> */
    .banner-image {
        display: block;
        width: 100%;
        height: auto;
        min-height: 250px;
        max-height: 600px;
        object-fit: cover;
        object-position: center;
    }

    .banner-text {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 2;
        max-width: 90%;
        padding: 2rem 3%;
        text-align: center;
    }

    .banner-text h1 {
        color: #ffffff;
        font-size: clamp(24px, 2.5vw, 36px);
        font-weight: 700;
        line-height: 1.3;
    }

    /* ------------------------ 2. 核心内容结构 ------------------------------------- */

    .page-title {
        text-align: center;
        font-size: 28px !important;
        font-weight: 700;
        margin-bottom: 20px;
    }

    /* 关键居中样式 */
    .page-intro {
        max-width: 1400px;
        margin: 0 auto 50px auto; /* 确保内容块居中 */
        text-align: center; /* 确保内部文本居中 */
        font-size: 18px;
        line-height: 1.6;
        color: #666;
    }

    /* 三列图标区域 */
    .three-column-grid {
        display: flex;
        justify-content: center;
        gap: 30px;
        padding: 40px 0;
        margin-bottom: 30px;
        border-top: 1px solid #eee;
        border-bottom: 1px solid #eee;
    }

    .column-item {
        flex: 1;
        max-width: 455px;
        text-align: center;
    }

    .column-item img {
        width: 50px; /* 图标尺寸 */
        height: 50px;
        margin-bottom: 10px;
    }

    .column-item h3 {
        font-size: 18px;
        font-weight: 700;
        margin-bottom: 10px;
        color: var(--primary-color);
    }

    .column-item p {
        font-size: 18px;
        line-height: 1.5;
        color: #999;
text-align: left;
    }

    /* 内容图文混合部分 */
    .story-content-grid {
        display: flex;
        gap: 40px;
        align-items: center;
        padding: 30px 0;
    }

    .story-text-wrapper {
        flex: 1;
        max-width: 50%;
    }

    .story-image-wrapper {
        flex: 1;
        max-width: 50%;
        overflow: hidden;
    }

    .story-image {
        display: block;
        width: 100%;
        height: auto;
        object-fit: cover;
        border-radius: 8px; /* 增加圆角效果 */
    }
    
    /* 生产流程图片样式（用于替换视频） */
    .production-image {
        display: block;
        width: 100%;
        height: auto;
        object-fit: cover;
        border-radius: 8px;
        margin-top: 20px;
    }

    .material-title {
        font-size: 28px !important;
        font-weight: 700;
        color: #333;
        margin-bottom: 20px;
    }

    .story-paragraph {
        font-size: 18px;
        line-height: 1.7;
        color: #666;
        margin-bottom: 20px;
    }
    
    .story-paragraph.small {
        font-size: 18px;
        line-height: 1.6;
        color: #666;
    }
    
    /* 按钮样式 */
    .banner-btn {
        display: inline-block;
        padding: 10px 25px;
        font-size: 18px;
        font-weight: 600;
        text-align: center;
        text-decoration: none;
        border-radius: 4px;
        cursor: pointer;
        transition: background-color 0.3s ease, border-color 0.3s ease;
        line-height: 1.5;
        margin-top: 10px;
    }

    .banner-btn.btn-primary {
        background-color: var(--primary-color);
        color: var(--text-color-light);
        border: 2px solid var(--primary-color);
    }
    .banner-btn.btn-primary:hover {
        background-color: #0c3332;
        border-color: #0c3332;
    }
    
    /* 两栏图文区域（左右图片） */
    .two-up-image-grid {
        display: flex;
        gap: 20px;
        margin-top: 20px;
    }

    .two-up-image-grid img {
        width: 50%;
        height: auto;
        object-fit: cover;
        border-radius: 8px;
    }
    
    /* ------------------------ 3. 响应式设计 ------------------------------------- */

    @media (max-width: 900px) {
        .three-column-grid {
            flex-wrap: wrap;
            gap: 20px;
        }
        .column-item {
            width: 45%;
            flex: none;
            max-width: none;
        }

        .story-content-grid {
            flex-direction: column;
            gap: 25px;
            padding: 20px 0;
        }

        .story-text-wrapper, .story-image-wrapper {
            max-width: 100%;
            width: 100%;
        }
        
        .two-up-image-grid {
            flex-direction: column;
            gap: 10px;
        }
        
        .two-up-image-grid img {
            width: 100%;
        }
    }

    @media (max-width: 600px) {
        .section-container {
            padding: 20px 15px;
        }
        .page-title {
            font-size: 24px;
            margin-bottom: 15px;
        }
        .page-intro {
            font-size: 16px;
            margin-bottom: 30px;
        }
        .column-item {
            width: 100%;
        }
        .column-item p {
            font-size: 16px;
        }
        .story-paragraph {
            font-size: 16px;
        }
        .story-content-grid h2 {
            font-size: 24px;
        }
        .story-content-grid .banner-btn {
            display: block;
            width: 100%;
            text-align: center;
        }
    }