/* ========== Banner ========== */
.banner-v1 {
    width: 100%;
    height: 900px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
}

.banner-bg-v1 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-content-v1 {
    position: relative;
    z-index: 2;
    padding: 0 80px 80px 0;
    max-width: 1800px;
    width: 100%;
    text-align: right;
}

.banner-content-v1 h1 {
    font-size: 40px;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.banner-content-v1 h1 .highlight-v1 {
    color: #b71c1c;
}

.banner-content-v1 h2 {
    font-size: 40px;
    font-weight: 400;
    color: #333;
    margin-bottom: 8px;
}

.banner-content-v1 h3 {
    font-size: 40px;
    font-weight: 700;
    color: #b71c1c;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.banner-content-v1 .en-subtitle-v1 {
    font-size: 22px;
    color: black;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.banner-line-v1 {
    margin-top: 10px;
}

.banner-line-v1 img {
    height: 40px;
    object-fit: contain;
}

/* 产品详情区域 */
.product-details {
    padding: 60px 0 80px;
    background: #fff;
}

.product-details-inner {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 40px;
}

/* 标题 */
.product-title {
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
}

.product-title-bar {
    width: 6px;
    height: 48px;
    background: #c0392b;
    border-radius: 2px;
    margin-right: 16px;
    flex-shrink: 0;
}

.product-title-text h2 {
    font-size: 28px;
    font-weight: 700;
    color: #c0392b;
    margin: 0;
    line-height: 1.2;
}

.product-title-text p {
    font-size: 14px;
    color: #333;
    margin: 4px 0 0;
    font-weight: 600;
    letter-spacing: 1px;
}

/* Tab 导航 */
.product-tabs {
    display: flex;
    align-items: flex-end;
    margin-bottom: 50px;
    gap: 0;
}

.product-tab {
    flex: 1;
    /*padding: 0 28px;*/
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    position: relative;
    transition: all 0.3s;
}

.product-tab .tab-name {
    font-size: 16px;
    color: #999;
    font-weight: 500;
    padding-bottom: 10px;
    border-bottom: 2px solid #e0e0e0;
    width: 100%;
    transition: color 0.3s, border-color 0.3s;
}

.product-tab .tab-num {
    font-size: 14px;
    color: #ccc;
    font-weight: 500;
    padding-top: 10px;
    transition: color 0.3s;
}

.product-tab.active .tab-name {
    color: #c0392b;
    font-weight: 600;
    border-bottom-color: #c0392b;
}

.product-tab.active .tab-num {
    color: #c0392b;
    font-weight: 600;
}

.product-tab:hover .tab-name {
    color: #c0392b;
}

/* 产品内容 */
.product-content {
    display: flex;
    align-items: center;
    gap: 100px;
}

.product-info {
    flex: 0 0 420px;
}

.product-name {
    font-size: 32px;
    font-weight: 700;
    color: #c0392b;
    margin: 0 0 30px;
}

.product-name span {
    font-size: 20px;
    color: #999;
    font-weight: 400;
    margin-left: 8px;
}

.product-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.product-features li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 18px;
    font-size: 16px;
    color: #333;
    line-height: 1.7;
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 8px;
    height: 8px;
    background: #c0392b;
    border-radius: 1px;
}

/* 产品图片 */
.product-image {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.product-image-bg {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 12px;
    background: #c0392b;
}

.product-image img {
    max-width: 100%;
    height: auto;
    position: relative;
    z-index: 1;
}

/* 响应式 */
@media (max-width: 992px) {
    .product-content {
        flex-direction: column;
    }

    .product-info {
        flex: none;
        width: 100%;
    }

    .product-image {
        width: 100%;
        min-height: 300px;
    }

    .product-tabs {
        flex-wrap: wrap;
        gap: 0;
    }

    .product-tab {
        padding: 0 16px 12px;
    }
}

@media (max-width: 576px) {
    .product-details-inner {
        padding: 0 20px;
    }

    .product-title-text h2 {
        font-size: 22px;
    }

    .product-name {
        font-size: 24px;
    }

    .product-tab {
        padding: 0 10px 10px;
    }

    .product-tab .tab-name {
        font-size: 13px;
    }
}