/* ===== CSS Variables ===== */
:root {
    --primary-color: #008F63;
    --primary-hover: #007050;
    --active-border: #009946;
    --text-color: #333333;
    --bg-white: #FFFFFF;
    --shadow-default: 0px 4px 10px 0px rgba(0, 0, 0, 0.1);
    
    --thumb-size: 160px;
    --thumb-radius: 10px;
    --thumb-border: 2px;
    
    --name-font-size: 36px;
    --name-line-height: 72px;
    --name-font-weight: 600;
    
    --spec-font-size: 16px;
    --spec-line-height: 36px;
    --spec-font-weight: 400;
    
    --desc-font-size: 16px;
    --desc-line-height: 36px;
    --desc-font-weight: 500;
}

/* ===== 容器布局 ===== */
.product-details {
    padding: 7rem 0;
    background-color: #ffffff;
}

.product-details-container {
    width: 90%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

.product-details-wrapper {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

/* ===== 左侧缩略图区域 ===== */
.product-thumbnails {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-shrink: 0;
}

/* 图二参数：缩略图样式 */
.product-thumbnail-item {
    width: var(--thumb-size);
    height: var(--thumb-size);
    background: var(--bg-white);
    box-shadow: var(--shadow-default);
    border-radius: var(--thumb-radius);
    border: 2px solid transparent;
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    box-sizing: border-box;
}

.product-thumbnail-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 激活状态 - 绿色边框 */
.product-thumbnail-item.product-thumbnail-active {
    border-color: var(--active-border);
}

.product-thumbnail-item:hover {
    border-color: var(--active-border);
}

/* ===== 中间主图区域 ===== */
.product-main-image {
    flex: 1;
    position: relative;
    padding: 3rem;
}

.product-main-logo {
    position: absolute;
    top: 2rem;
    left: 3rem;
    width: 60px;
    height: auto;
    z-index: 2;
}

.product-main-logo img {
    width: 100%;
    height: auto;
}

/* 虚线边框的主图容器 */
.product-main-image-wrapper {
    width: 100%;
    max-width: 600px;
    aspect-ratio: 1 / 0.8;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-main-image-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* ===== 右侧产品信息区域 ===== */
.product-info {
    flex: 1;
    max-width: 680px;
    padding-top: 1rem;
}

/* 图三参数：Product Name 标题 */
.product-info-name {
    width: 100%;
    height: auto;
    font-family: 'Palanquin', 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    font-weight: var(--name-font-weight);
    font-size: var(--name-font-size);
    color: var(--text-color);
    line-height: var(--name-line-height);
    text-align: left;
    font-style: normal;
    text-transform: none;
    margin-bottom: 0.5rem;
}

/* 图四参数：Specifications 规格文字 */
.product-info-spec {
    width: 100%;
    height: auto;
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: var(--spec-font-weight);
    font-size: var(--spec-font-size);
    color: var(--text-color);
    line-height: var(--spec-line-height);
    text-align: left;
    font-style: normal;
    text-transform: none;
    margin-bottom: 1.5rem;
}

/* 图五参数：Product Description 产品描述 */
.product-info-description {
    margin-bottom: 2rem;
}

.product-info-desc-title {
    font-family: 'Palanquin', 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    font-weight: var(--desc-font-weight);
    font-size: 16px;
    color: var(--text-color);
    line-height: 36px;
    margin-bottom: 0.75rem;
}

.product-info-desc-list {
    width: 100%;
    height: auto;
    font-family: 'Palanquin', 'Palatino Linotype', 'Book Antiqua', Palatino, serif !important;
    font-weight: var(--desc-font-weight) !important;
    font-size: 14px !important;
    color: #666 !important;
    line-height: var(--desc-line-height) !important;
    text-align: left;
    font-style: normal;
    text-transform: none;
    padding-left: 0;
    counter-reset: item;
}

.product-info-desc-list li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 0.25rem;
    counter-increment: item;
}

.product-info-desc-list li::before {
    content: counter(item) ".";
    margin-right: 0.5rem;
    flex-shrink: 0;
    font-family: 'Palanquin', serif;
    font-weight: var(--desc-font-weight);
    font-size: var(--desc-font-size);
    color: var(--text-color);
}

/* ===== Contact Us 按钮 ===== */
.product-info-contact {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 0.75rem 2rem;
    border-radius: 2rem;
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.product-info-contact:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.contact-arrow {
    font-size: 18px;
    font-weight: 600;
    line-height: 1;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .product-details-wrapper {
        gap: 2rem;
    }
    
    .product-main-image-wrapper {
        max-width: 500px;
    }
    
    :root {
        --name-font-size: 30px;
        --name-line-height: 60px;
    }
}

@media (max-width: 1024px) {
    .product-details-wrapper {
        flex-direction: column;
        align-items: center;
    }
    
    .product-thumbnails {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .product-main-image {
        width: 100%;
        padding: 2rem;
        display: flex;
        justify-content: center;
    }
    
    .product-main-logo {
        top: 1rem;
        left: 1rem;
        width: 50px;
    }
    
    .product-main-image-wrapper {
        max-width: 100%;
        width: 100%;
    }
    
    .product-info {
        max-width: 100%;
        text-align: center;
    }
    
    .product-info-name,
    .product-info-spec,
    .product-info-desc-title,
    .product-info-desc-list {
        text-align: center;
    }
    
    .product-info-desc-list li {
        justify-content: center;
    }
    
    .product-info-contact {
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .product-details {
        padding: 2rem 0;
    }
    
    .product-thumbnails {
        gap: 0.75rem;
    }
    
    :root {
        --thumb-size: 100px;
        --name-font-size: 24px;
        --name-line-height: 48px;
        --spec-font-size: 14px;
        --spec-line-height: 28px;
        --desc-font-size: 14px;
        --desc-line-height: 28px;
    }
    
    .product-main-image {
        padding: 1rem;
    }
    
    .product-main-logo {
        width: 40px;
    }
}

@media (max-width: 480px) {
    :root {
        --thumb-size: 80px;
        --name-font-size: 20px;
        --name-line-height: 40px;
    }
    
    .product-details-container {
        width: 95%;
        padding: 0 10px;
    }
    
    .product-thumbnails {
        gap: 0.5rem;
    }
}