:root {
    --padding-x: calc((100vw - 1000px) / 2);
    --small-size: 10px;
    --navy: #082b4a;
    --red: #d81724;
    --font-color-bw: #555;
    --radius-sm: 3px;
    --main-color: #0d4894;
    --section-color: #f4f7fb;

    --primary-blue: #0f3d76;
    --primary-red: #c91b1b;
    --bg-light: #f7f8fa;
    --text-main: #333333;
    --text-secondary: #666666;
    --border-color: #e5e5e5;
    --table-header-bg: #1a4f96;
}

section{
    padding: 40px var(--padding-x) 70px;
}
.modal-mask section{
    padding: 0;
}

.banner-section {
    background: url(../images/product-detail-home.jpg) center / 100% 100% no-repeat;
    padding: 0 var(--padding-x);
}
.banner-content {
    min-height: 220px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.product-center {
    font-size: 14px;
    color: #0a54a0;
    font-weight: 500;
}
.main-title {
    font-size: 30px;
    color: #07345b;
    margin: 5px 0;
}
.subtitle {
    font-size: 14px;
    color: #4b5563;
    margin: 5px 0 40px 0;
}
.breadcrumb {
    font-size: 13px;
    color: #6b7280;
}
.breadcrumb span:last-child {
    color: #aaa;
}
.breadcrumb-separator {
    margin: 0 8px;
}
.product-header-section {
    padding: 20px var(--padding-x);
}
.product-header {
    display: grid;
    gap: 60px;
    margin-bottom: 30px;
    grid-template-columns: 1fr 1fr;
}
.product-header .image-container img{
    cursor: zoom-in;
}
.image-container {
    padding: 30px 25px;
    background: #f4f8fc;
}
.product-image {
    flex: 1;
    text-align: center;
}
.product-image img {
    max-width: 100%;
    max-height: 260px;
    object-fit: contain;
}

.product-info {
    display: flex;
    flex-direction: column;
}

.product-title {
    font-size: 28px;
    color: #1a365d;
    margin: 15px 0;
}

.product-subtitle {
    font-size: 12px;
    color: #0064ca;
    font-weight: 500;
}

.product-description {
    font-size: 15px;
    color: #4a5568;
    margin-bottom: 20px;
    line-height: 1.8;
    min-height: 40px;
}

.product-features {
    margin-bottom: 30px;
    font-size: 14px;
    padding: 0;
    min-height: 80px;
}

.product-features li {
    margin-bottom: 5px;
    display: flex;
    align-items: flex-end;
    margin-left: -10px;
}

.product-features li::before {
    content: "•";
    color: #333;
    font-size: 34px;
    line-height: 20px;
}

.product-actions {
    display: flex;
    gap: 20px;
}

.product-actions .button {
    padding: 12px 30px;
    font-size: 14px;
}

.thumbnail-container {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.thumbnail {
    width: 70px;
    height: 50px;
    border: 2px solid #e2e8f0;
    cursor: pointer;
    padding: 3px;
}

.thumbnail.active {
    border-color: #e53e3e;
}

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


ul { list-style: none; }

/* --- 顶部导航栏 --- */
.nav-inner {
    background: #f3f7fb;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #e5e5e5;
    padding: 0 var(--padding-x);
}
.divider{
    border: none;
    height: 1px;
    background-color: #e0e0e0;
    margin: 20px 0;
}
.nav-links {
    display: flex;
    gap: 30px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 0;
    margin: 0;
}
.nav-links li{
    padding: 12px 0;
    cursor: pointer;
}
.nav-links li:hover{
    padding-bottom: 10px;
    color:var(--primary-blue);
    border-bottom: 2px solid var(--primary-red);
}

.overview-section{
}
.section-header {
    /*display: flex;*/
    /*gap: 5px;*/
    /*flex-direction: column;*/
    /*font-size: 12px;*/
    display: inline-block;
    font-size: 13px;
    text-align: center;
}
.section-num {
    color: var(--primary-red);
}
.section-en-title {
    color: #296aac;
    font-weight: 500;
}
.section-title {
    font-size: 20px;
    color: var(--primary-blue);
    font-weight: 500;
}
.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 2px;
    background: var(--primary-red);
    margin-top: 10px;
}

/* --- 01 产品概述 --- */
.product-text {
    margin-top: 15px;
    font-size: 14px;
    color: #506372;
    line-height: 1.8;
    font-weight: 500;
}

.stats-grid {
    margin: 100px 0 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}
.stat-item {
    padding: 18px ;
    text-align: center;
    border: 1px solid var(--border-color);
    background: #fff;
}
.stat-val {
    font-size: 19px;
    font-weight: 500;
    color: var(--primary-blue);
    margin-bottom: 5px;
}
.stat-label {
    font-size: 11px;
    color: var(--text-secondary);
}

/* --- 02 工作原理 --- */
.principle-section {
    display: flex;
    align-items: flex-start;
    gap: 60px;
}
.principle-diagram {
    flex: 1;
    background: #fff;
    border: 1px solid var(--border-color);
    min-height: 300px;
}
.principle-diagram img{
    width: 100%;
}
.principle-content { flex: 1; }
.principle-content p {
    color: #445969;
}

/* --- 03 产品特点 --- */
.feature-section{
}
.feature-section .section-title::after,.application-section .section-title::after {
    margin: 10px auto 0;
}
.features-grid {
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.feature-card {
    padding: 20px;
    border: 1px solid var(--border-color);
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}
.feature-num {
    color: red;
    font-size: 10px;
    display: block;
}
.feature-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--primary-blue);
    margin-bottom: 10px;
}
.feature-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* --- 04 技术参数 --- */
.tech-param-section {

}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: #f8fbfd;
    border-bottom: 1px solid var(--border-color);
}
.tech-table th {
    background: var(--table-header-bg);
    color: #fff;
    padding: 10px 20px;
    text-align: left;
    font-weight: normal;
    font-size: 13px;
}
tr td:nth-child(odd) {
    color: #333;
}
.tech-table td {
    padding: 10px 20px;
    font-size: 13px;
    color: var(--text-secondary);
}
.tech-table tr:nth-child(even) {
    background-color: #fcfcfc;
    border: 1px solid var(--border-color);
}
.tech-note {
    font-size: 12px;
    color: #6f8498;
}
.tech-footer {
    margin-top: 20px;
    display: flex;
    justify-content: space-between;
}

/* --- 05 应用领域 --- */
.application-section {

}
.application-section .section-header{
    text-align: center;
}


.app-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-top: 20px;
}

.app-card {
    background: #fff;
    border: 1px solid #eaeaea;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}

.app-card .img-box {
    width: 100%;
    height: 160px;
    overflow: hidden;
    background-color: #f0f0f0;
}

.app-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.app-card:hover img {
    transform: scale(1.05);
}

.app-card .card-body {
    padding: 15px;
    border-top: 1px solid #eaeaea;
    min-height: 35px;
}

.app-card span {
    font-size: 13px;
    color: #0f3d76;
    font-weight: 600;
}

/* --- 06 资料下载样式 --- */
.download-section {

}

.download-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 2列布局 */
    gap: 20px;
    margin-top: 25px;
}

.download-item {
    background: #fff;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #eaeaea;
    transition: all 0.3s;
}

.download-item:hover {
    /*border-color: #0f3d76;*/
    box-shadow: 0 5px 15px rgba(15, 61, 118, 0.1);
}

.dl-content {
    flex: 1;
}
.file-type {
    color: #c91b1b;
    font-size: 11px;
}
.dl-content h4 {
    font-size: 15px;
    color: #3d586e;
    margin: 5px 0;
    font-weight: 500;
}
.file-size {
    font-size: 12px;
    color: #999;
    margin: 10px 0 0;
}
.dl-btn {
    color: #2276c9;
    font-size: 13px;
}



.recommend-products-section {

}
.recommend-products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.recommend-product-card {
    border: 1px solid #ebebeb;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}
.recommend-product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}
.recommend-product-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}
.recommend-product-info {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px 20px;
}
.recommend-product-name {
    font-size: 18px;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 8px;
}
.recommend-product-english-name {
    font-size: 12px;
    color: #666;
    margin: 0;
}
.arrow-icon {
    display: inline-block;
    color: #e53e3e;
    font-size: 20px;
    transition: transform 0.3s ease;
}
.recommend-product-card:hover .arrow-icon {
    transform: translateX(5px);
}
.recommend-products-grid {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}