:root {
            --banner-height: 600px;
            --transition-speed: 0.6s;
            --card-bg: #ffffff;
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
            --primary: #1a73e8;
            --bg: #f5f6f8;
            --text: #333333;
            --text-light: #666666;
            --border: #e8e8e8;
            --shadow: 0 2px 16px rgba(0, 0, 0, 0.07);
            --radius: 12px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --gap: 20px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            min-height: 100vh;
        }

        /* ==================== 轮播图容器 ==================== */
        .carousel {
            position: relative;
            width: 100%;
            height: var(--banner-height);
            overflow: hidden;
            background: #1a1a1a;
        }

        /* ==================== 幻灯片轨道 ==================== */
        .carousel__track {
            display: flex;
            width: 100%;
            height: 100%;
            transition: transform var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ==================== 单张幻灯片 ==================== */
        .carousel__slide {
            flex: 0 0 100%;
            width: 100%;
            height: 100%;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        /* 图片样式 - 宽度铺满，高度保持比例 */
        .carousel__image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center center;
            display: block;
            user-select: none;
            -webkit-user-drag: none;
            pointer-events: none;
        }

        /* ==================== 左右箭头按钮 ==================== */
        .carousel__btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid rgba(255, 255, 255, 0.3);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            z-index: 10;
            color: #fff;
            font-size: 1.4rem;
            font-weight: 300;
            outline: none;
            opacity: 0;
            /* 默认隐藏 */;
        }

        .carousel:hover .carousel__btn {
            opacity: 1;
        }

        .carousel__btn:hover {
            background: rgba(255, 255, 255, 0.4);
            border-color: rgba(255, 255, 255, 0.6);
            transform: translateY(-50%) scale(1.08);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
        }

        .carousel__btn:active {
            transform: translateY(-50%) scale(0.95);
        }

        .carousel__btn--prev {
            left: 24px;
        }

        .carousel__btn--next {
            right: 24px;
        }

        /* 箭头SVG */
        .carousel__btn svg {
            width: 22px;
            height: 22px;
            stroke: #fff;
            fill: none;
            stroke-width: 2.5;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        /* ==================== 底部指示器 ==================== */
        .carousel__dots {
            position: absolute;
            bottom: 24px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 12px;
            z-index: 10;
            padding: 6px 16px;
            background: rgba(0, 0, 0, 0.35);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: 30px;
        }

        .carousel__dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.5);
            border: none;
            cursor: pointer;
            transition: all 0.35s ease;
            padding: 0;
            outline: none;
        }

        .carousel__dot:hover {
            background: rgba(255, 255, 255, 0.8);
            transform: scale(1.2);
        }

        .carousel__dot--active {
            background: #fff;
            width: 32px;
            border-radius: 10px;
            box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
        }

        /* ==================== 响应式适配 ==================== */
        @media (max-width: 768px) {
            :root {
                --banner-height: 280px;
            }

            .carousel__btn {
                width: 40px;
                height: 40px;
            }

            .carousel__btn svg {
                width: 18px;
                height: 18px;
            }

            .carousel__btn--prev {
                left: 12px;
            }

            .carousel__btn--next {
                right: 12px;
            }

            .carousel__dots {
                bottom: 16px;
                gap: 8px;
                padding: 5px 12px;
            }

            .carousel__dot {
                width: 8px;
                height: 8px;
            }

            .carousel__dot--active {
                width: 24px;
            }
        }

        @media (max-width: 480px) {
            :root {
                --banner-height: 200px;
            }

            .carousel__btn {
                width: 34px;
                height: 34px;
            }

            .carousel__btn svg {
                width: 16px;
                height: 16px;
            }
        }


/* ==================== 外层容器 ==================== */
        .container {
            width: 100%;
            max-width: 1600px;
            margin: 0 auto;
        }

        .section-title_1 {
            text-align: center;
            margin: 30px auto;
            font-size: 1.5rem;
            font-weight: 700;
            color: #1a1a1a;
        }

        .section-title_2 {
            text-align: center;
            font-size: 1.5rem;
            font-weight: 700;
            color: #1a1a1a;
            margin-top: 40px;
        }


        /* ==================== 四列网格布局 ==================== */
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
            width: 100%;
        }

        /* ==================== 单个卡片模块 ==================== */
        .card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px 24px;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            border: 1px solid var(--border);
            position: relative;
            overflow: hidden;
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #4a90ff, #1a73e8);
            transform: scaleX(0);
            transform-origin: center;
            transition: transform var(--transition);
        }

        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }

        .card:hover::before {
            transform: scaleX(1);
        }



        .card:hover .card__icon {
            transform: scale(1.1) rotate(-5deg);
        }

       

        /* 卡片标题 */
        .card__title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #1a1a1a;
        }

        /* 卡片描述 */
        .card__desc {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.7;
        }

  
        /* ==================== 响应式：平板端两列 ==================== */
        @media (max-width: 960px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }

            .section-title {
                font-size: 1.6rem;
                margin-bottom: 28px;
            }

            .card {
                padding: 24px 18px;
            }
        }

        /* ==================== 响应式：手机端单列居中铺满 ==================== */
        @media (max-width: 600px) {
            .grid-4 {
                grid-template-columns: 1fr;
                max-width: 420px;
                margin: 0 auto;
            }

            .card {
                padding: 28px 24px;
                max-width: 100%;
            }

            .section-title {
                font-size: 1.4rem;
                margin-bottom: 24px;
            }

            .card__icon {
                width: 56px;
                height: 56px;
                font-size: 24px;
                border-radius: 14px;
            }
        }

        @media (max-width: 380px) {
            /* body {
                padding: 12px;
            } */

            .grid-4 {
                gap: 14px;
            }

            .card {
                padding: 22px 16px;
            }
        }




/* ==================== 产品展示网格 ==================== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap);
    width: 100%;
}

/* ==================== 单个产品项 ==================== */
.product-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

/* 产品图片 - 1:1比例 */
.product-item__img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    margin-bottom: 16px;
    object-fit: cover;
    aspect-ratio: 1 / 1;
}

/* 产品标题 */
.product-item__title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #1a1a1a;
}

/* 产品描述 */
.product-item__desc {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ==================== 响应式：平板端两列 ==================== */
@media (max-width: 960px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==================== 手机端单列 ==================== */
@media (max-width: 600px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .product-item {
        padding: 20px;
    }
    
    .product-item__title {
        font-size: 1.05rem;
    }
}

.why_container{
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    max-width: 1600px;
    margin: 0 auto;
}

.why_choose{
    width: 90%;
    margin: 0 auto;
}




/* ==================== 三列链接网格 ==================== */
.link-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap);
    width: 100%;
}

/* ==================== 单个链接项 ==================== */
.link-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* 描述文字 */
.link-item__text {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}

/* 按钮 */
.link-item__btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background 0.2s;
    border: none;
    cursor: pointer;
}

.link-item__btn:hover {
    background: var(--primary-dark);
}

/* ==================== 手机端：第一行一个，第二行两个 ==================== */
@media (max-width: 600px) {
    .link-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 第一个元素横跨整行 */
    .link-item:first-child {
        grid-column: 1 / -1;
    }
    
    .link-item {
        padding: 20px;
    }
}