/* ========== 顶部 Banner ========== */
.top-banner {
    width: 100%;
    height: 500px;
    overflow: hidden;
    position: relative;
}

.top-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
}

@media (max-width: 768px) {
    .top-banner {
        height: 280px;
    }
}

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

/* ========== 产品中心模块 ========== */
.zdb-product {
    width: 100%;
    padding: 50px 0;
    background-color: #ffffff;
}

.zdb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 标题区 */
.zdb-product-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 35px;
}

.zdb-product-title-wrap {
    flex: 1;
}

.zdb-product-title {
    font-size: 28px;
    font-weight: bold;
    color: #1a1a1a;
    margin: 0 0 12px 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.zdb-title-bar {
    display: inline-block;
    width: 4px;
    height: 28px;
    background-color: #d61c2a;
    margin-right: 12px;
    border-radius: 2px;
    flex-shrink: 0;
}

.zdb-product-sub {
    font-size: 14px;
    color: #888888;
    margin: 0;
    padding-left: 16px;
    line-height: 1.5;
}

.zdb-product-more {
    font-size: 14px;
    color: #333333;
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
    flex-shrink: 0;
    padding-top: 8px;
}

.zdb-product-more:hover {
    color: #d61c2a;
}

.zdb-arrow-right {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-top: 1.5px solid #333;
    border-right: 1.5px solid #333;
    transform: rotate(45deg);
    margin-left: 8px;
    transition: border-color 0.3s ease;
}

.zdb-product-more:hover .zdb-arrow-right {
    border-color: #d61c2a;
}

/* 产品卡片网格 */
.zdb-product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* 产品卡片 */
.zdb-product-card {
    display: block;
    background-color: #ffffff;
    border-radius: 4px;
    overflow: hidden;
    text-decoration: none;
    border: 1px solid #eeeeee;
    transition: all 0.3s ease;
}

.zdb-product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #e0e0e0;
}

/* 卡片图片区 */
.zdb-product-img {
    width: 100%;
    height: 180px;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.zdb-product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

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

/* 卡片底部信息区 */
.zdb-product-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background-color: #ffffff;
}

.zdb-product-name {
    font-size: 15px;
    font-weight: 500;
    color: #333333;
    line-height: 1.4;
}

/* 箭头图标（圆形蓝色背景 + 白色箭头） */
.zdb-arrow-circle {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: #2b6cb0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    transition: background-color 0.3s ease;
}

.zdb-arrow-circle::before {
    content: '';
    width: 6px;
    height: 6px;
    border-top: 1.5px solid #ffffff;
    border-right: 1.5px solid #ffffff;
    transform: rotate(45deg) translate(-1px, 1px);
}

.zdb-product-card:hover .zdb-arrow-circle {
    background-color: #d61c2a;
}

/* 响应式 */
@media (max-width: 992px) {
    .zdb-product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

@media (max-width: 576px) {
    .zdb-product {
        padding: 30px 0;
    }
    
    .zdb-product-header {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 25px;
    }
    
    .zdb-product-title {
        font-size: 22px;
    }
    
    .zdb-title-bar {
        height: 22px;
    }
    
    .zdb-product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .zdb-product-img {
        height: 120px;
    }
    
    .zdb-product-info {
        padding: 12px 14px;
    }
    
    .zdb-product-name {
        font-size: 13px;
    }
    
    .zdb-arrow-circle {
        width: 24px;
        height: 24px;
    }
}

/* ========== 产品优势模块 ========== */
.zdb-advantage {
    width: 100%;
    padding: 50px 0;
    background-color: #ffffff;
}

/* 与产品中心共用标题区样式，但这里用独立类名保持隔离 */
.zdb-adv-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 35px;
}

.zdb-adv-title-wrap {
    flex: 1;
}

.zdb-adv-title {
    font-size: 28px;
    font-weight: bold;
    color: #1a1a1a;
    margin: 0 0 12px 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.zdb-adv-sub {
    font-size: 14px;
    color: #888888;
    margin: 0;
    padding-left: 16px;
    line-height: 1.5;
}

/* 卡片网格：3列 */
.zdb-adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* 优势卡片 */
.zdb-adv-card {
    background-color: #ffffff;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #eeeeee;
    transition: all 0.3s ease;
    cursor: pointer;
}

.zdb-adv-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #e0e0e0;
}

/* 卡片图片 */
.zdb-adv-img {
    width: 100%;
    height: 200px;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.zdb-adv-img img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

/* 卡片文字区 */
.zdb-adv-body {
    padding: 20px 22px 24px;
    background-color: #ffffff;
}

.zdb-adv-name {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0 0 10px 0;
    line-height: 1.4;
}

.zdb-adv-desc {
    font-size: 13px;
    color: #666666;
    margin: 0;
    line-height: 1.7;
}

/* 产品优势响应式 */
@media (max-width: 992px) {
    .zdb-adv-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

@media (max-width: 576px) {
    .zdb-advantage {
        padding: 30px 0;
    }
    
    .zdb-adv-header {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 25px;
    }
    
    .zdb-adv-title {
        font-size: 22px;
    }
    
    .zdb-adv-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    
    .zdb-adv-img {
        height: 160px;
    }
    
    .zdb-adv-body {
        padding: 14px 16px 18px;
    }
    
    .zdb-adv-name {
        font-size: 15px;
    }
    
    .zdb-adv-desc {
        font-size: 12px;
    }
}

/* ========== 型号选择模块 ========== */
.zdb-model {
    width: 100%;
    padding: 50px 0;
    background-color: #f4f6f9;
}

.zdb-model-header {
    margin-bottom: 35px;
}

.zdb-model-title-wrap {
    display: flex;
    flex-direction: column;
}

.zdb-model-title {
    font-size: 28px;
    font-weight: bold;
    color: #1a1a1a;
    margin: 0 0 12px 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.zdb-model-sub {
    font-size: 14px;
    color: #888888;
    margin: 0;
    padding-left: 16px;
    line-height: 1.5;
}

/* 表格容器 */
.zdb-model-wrap {
    max-width: 1200px;
    margin: 0 auto;
    border: 1px solid #d9dce2;
    border-radius: 4px;
    overflow: hidden;
    background-color: #ffffff;
}

/* 顶部蓝色提示栏 */
.zdb-model-notice {
    background-color: #2b6cb0;
    color: #ffffff;
    font-size: 15px;
    font-weight: 500;
    text-align: center;
    padding: 14px 20px;
    letter-spacing: 1px;
}

/* 型号表格 */
.zdb-model-table {
    width: 100%;
    border-collapse: collapse;
    border: none;
}

.zdb-model-table tbody tr {
    display: table-row;
}

.zdb-model-table tbody tr:nth-child(even) {
    background-color: #ebf3fa;
}

.zdb-model-table tbody tr:nth-child(odd) {
    background-color: #ffffff;
}

.zdb-model-table td {
    width: calc(100% / 6);
    text-align: center;
    padding: 16px 10px;
    font-size: 15px;
    color: #333333;
    font-weight: 500;
    border-right: 1px solid #e8ebf0;
    border-bottom: 1px solid #e8ebf0;
    font-family: "Consolas", "Menlo", "微软雅黑", sans-serif;
    letter-spacing: 0.5px;
}

.zdb-model-table td:last-child {
    border-right: none;
}

.zdb-model-table tbody tr:last-child td {
    border-bottom: none;
}

/* 型号选择响应式 */
@media (max-width: 992px) {
    .zdb-model-table td {
        font-size: 13px;
        padding: 12px 6px;
    }
}

@media (max-width: 768px) {
    .zdb-model {
        padding: 30px 0;
    }
    
    .zdb-model-title {
        font-size: 22px;
    }
    
    .zdb-model-notice {
        font-size: 13px;
        padding: 10px 14px;
    }
    
    .zdb-model-table td {
        font-size: 12px;
        padding: 10px 4px;
    }
}

@media (max-width: 480px) {
    .zdb-model-table {
        /* 移动端改为3列显示 */
        display: block;
    }
    .zdb-model-table tbody {
        display: block;
    }
    .zdb-model-table tr {
        display: flex;
        flex-wrap: wrap;
    }
    .zdb-model-table td {
        flex: 0 0 33.33%;
        width: 33.33%;
        font-size: 12px;
        padding: 10px 4px;
        border-bottom: 1px solid #e8ebf0;
        border-right: 1px solid #e8ebf0;
    }
    .zdb-model-table td:nth-child(3n) {
        border-right: none;
    }
}

/* ========== 广告图模块 ========== */
.zdb-ad-banner {
    width: 100%;
    padding: 40px 0;
    background-color: #ffffff;
}

.zdb-ad-link {
    display: block;
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
    border-radius: 0;
    overflow: hidden;
    text-decoration: none;
}

.zdb-ad-link img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.4s ease;
}

.zdb-ad-link:hover img {
    transform: scale(1.02);
}

/* 广告图响应式 */
@media (max-width: 768px) {
    .zdb-ad-banner {
        padding: 24px 0;
    }
}

@media (max-width: 480px) {
    .zdb-ad-banner {
        padding: 16px 0;
    }
}

/* ========== 应用领域模块 ========== */
.zdb-application {
    width: 100%;
    padding: 50px 0;
    background-color: #f4f6f9;
}

.zdb-app-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 35px;
}

.zdb-app-title-wrap {
    flex: 1;
    padding-right: 40px;
}

.zdb-app-title {
    font-size: 28px;
    font-weight: bold;
    color: #1a1a1a;
    margin: 0 0 12px 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.zdb-app-sub {
    font-size: 14px;
    color: #888888;
    margin: 0;
    padding-left: 16px;
    line-height: 1.7;
}

/* 应用领域卡片网格：3列 */
.zdb-app-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* 应用卡片 */
.zdb-app-card {
    background-color: #ffffff;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #e8ebf0;
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.zdb-app-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
    border-color: #d9dce2;
}

/* 卡片图片区 */
.zdb-app-img {
    width: 100%;
    height: 200px;
    background-color: #eaecef;
    overflow: hidden;
}

.zdb-app-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.45s ease;
}

.zdb-app-card:hover .zdb-app-img img {
    transform: scale(1.06);
}

/* 卡片文字区 */
.zdb-app-body {
    padding: 20px 22px 24px;
    background-color: #ffffff;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.zdb-app-name {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0 0 10px 0;
    line-height: 1.4;
}

.zdb-app-desc {
    font-size: 13px;
    color: #666666;
    margin: 0;
    line-height: 1.7;
}

/* 应用领域响应式 */
@media (max-width: 992px) {
    .zdb-app-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .zdb-app-img {
        height: 170px;
    }
}

@media (max-width: 768px) {
    .zdb-application {
        padding: 30px 0;
    }
    
    .zdb-app-header {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 25px;
    }
    
    .zdb-app-title-wrap {
        padding-right: 0;
    }
    
    .zdb-app-title {
        font-size: 22px;
    }
    
    .zdb-app-body {
        padding: 16px 18px 18px;
    }
}

@media (max-width: 480px) {
    .zdb-app-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    
    .zdb-app-img {
        height: 160px;
    }
    
    .zdb-app-name {
        font-size: 15px;
    }
    
    .zdb-app-desc {
        font-size: 12px;
    }
}

/* ========== 质量管控模块 ========== */
.zdb-qc {
    width: 100%;
    padding: 50px 0;
    background-color: #ffffff;
}

.zdb-qc-header {
    text-align: left;
    margin-bottom: 40px;
}

.zdb-qc-title {
    font-size: 28px;
    font-weight: bold;
    color: #1a1a1a;
    margin: 0 0 12px 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.zdb-qc-sub {
    font-size: 14px;
    color: #888888;
    margin: 0;
    padding-left: 16px;
    line-height: 1.5;
}

/* 每行 zigzag 布局 */
.zdb-qc-list {
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.zdb-qc-row {
    display: flex;
    align-items: stretch;
    gap: 40px;
}

.zdb-qc-row--left .zdb-qc-text { order: 1; flex: 1 1 40%; }
.zdb-qc-row--left .zdb-qc-img  { order: 2; flex: 1 1 60%; }

.zdb-qc-row--right .zdb-qc-text { order: 2; flex: 1 1 40%; }
.zdb-qc-row--right .zdb-qc-img  { order: 1; flex: 1 1 60%; }

/* 文字块 */
.zdb-qc-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 10px 0;
}

.zdb-qc-num {
    width: 88px;
    height: 88px;
    margin-bottom: 14px;
}

.zdb-qc-num img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.zdb-qc-name {
    font-size: 22px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0 0 14px 0;
    line-height: 1.4;
}

.zdb-qc-desc {
    font-size: 14px;
    color: #555555;
    margin: 0;
    line-height: 1.8;
}

/* 图片块 */
.zdb-qc-img {
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.zdb-qc-img img {
    width: 100%;
    height: auto;
    max-height: 280px;
    object-fit: cover;
    display: block;
    border-radius: 6px;
    transition: transform 0.4s ease;
}

.zdb-qc-row:hover .zdb-qc-img img {
    transform: scale(1.03);
}

/* 质量管控响应式 */
@media (max-width: 992px) {
    .zdb-qc-num {
        width: 70px;
        height: 70px;
    }
    .zdb-qc-name {
        font-size: 18px;
    }
    .zdb-qc-desc {
        font-size: 13px;
    }
    .zdb-qc-row {
        gap: 24px;
    }
    .zdb-qc-img img {
        max-height: 220px;
    }
}

@media (max-width: 768px) {
    .zdb-qc {
        padding: 30px 0;
    }
    .zdb-qc-title {
        font-size: 22px;
    }
    .zdb-qc-list {
        gap: 28px;
    }
    .zdb-qc-row,
    .zdb-qc-row--left,
    .zdb-qc-row--right {
        flex-direction: column;
        gap: 14px;
    }
    .zdb-qc-row--left .zdb-qc-text,
    .zdb-qc-row--left .zdb-qc-img,
    .zdb-qc-row--right .zdb-qc-text,
    .zdb-qc-row--right .zdb-qc-img {
        order: initial;
        flex: 1 1 100%;
    }
    .zdb-qc-num {
        width: 60px;
        height: 60px;
    }
    .zdb-qc-img img {
        max-height: 180px;
    }
}

@media (max-width: 480px) {
    .zdb-qc-name {
        font-size: 16px;
    }
    .zdb-qc-desc {
        font-size: 12px;
    }
    .zdb-qc-num {
        width: 52px;
        height: 52px;
    }
}

/* ========== 关于我们模块 ========== */
.zdb-about {
    width: 100%;
    padding: 60px 0 50px;
    background-color: #1e3a5f;
    color: #ffffff;
    overflow: hidden;
    position: relative;
}

/* 整体布局：文字左 + 图片右，图片可超出1200px容器到页面边缘 */
.zdb-about-wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: stretch;
    position: relative;
}

/* 左侧文字区：约 600px */
.zdb-about-text {
    flex: 0 0 600px;
    max-width: 600px;
    padding-top: 10px;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 2;
}

/* 右侧图片区：约 600px + 溢出到页面右边缘 */
.zdb-about-img {
    flex: 1 1 auto;
    min-width: 0;
    margin-left: 40px;
    /* 关键：向右溢出，让图片贴到浏览器边缘 */
    margin-right: calc(-1 * ((100vw - 1200px) / 2 + 20px));
    position: relative;
    z-index: 1;
    overflow: hidden;
    border-radius: 6px 0 0 6px;
    margin-top: 10px;
    align-self: stretch;
}

.zdb-about-img img {
    width: 100%;
    height: 100%;
    min-height: 360px;
    object-fit: cover;
    object-position: center right;
    display: block;
    transition: transform 0.5s ease;
    border-radius: 6px 0 0 6px;
}

.zdb-about-img:hover img {
    transform: scale(1.03);
}

/* 标题 */
.zdb-about-title {
    font-size: 28px;
    font-weight: bold;
    color: #ffffff;
    margin: 0 0 10px 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.zdb-about-title .zdb-title-bar {
    background-color: #D61C2A;
}

.zdb-about-sub {
    font-size: 13px;
    color: #b0c4dc;
    margin: 0 0 22px 0;
    padding-left: 16px;
    letter-spacing: 1px;
}

/* 公司名 */
.zdb-about-company {
    font-size: 22px;
    font-weight: bold;
    color: #ffffff;
    margin: 0 0 8px 0;
    line-height: 1.4;
}

.zdb-about-slogan {
    font-size: 14px;
    color: #b0c4dc;
    margin: 0 0 22px 0;
    padding-left: 16px;
}

/* 公司描述段落 */
.zdb-about-p {
    font-size: 14px;
    color: #e1eaf4;
    margin: 0 0 12px 0;
    line-height: 1.9;
    text-align: justify;
}

/* 了解更多按钮 */
.zdb-about-btn {
    display: inline-block;
    margin-top: 20px;
    padding: 11px 28px;
    font-size: 14px;
    font-weight: 500;
    color: #ffffff;
    border: 1.5px solid #ffffff;
    border-radius: 2px;
    text-decoration: none;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    align-self: flex-start;
}

.zdb-about-btn:hover {
    background-color: #ffffff;
    color: #1e3a5f;
}

.zdb-btn-arrow {
    margin-left: 4px;
    transition: transform 0.3s ease;
}

.zdb-about-btn:hover .zdb-btn-arrow {
    transform: translateX(3px);
    display: inline-block;
}

/* BTP 博特精工 底部 logo */
.zdb-about-logo {
    margin-top: 30px;
    padding-top: 16px;
    border-top: 1px solid rgba(255,255,255,0.15);
    font-size: 22px;
    font-weight: bold;
    color: #ffffff;
    letter-spacing: 2px;
}

.zdb-about-logo span {
    font-size: 18px;
    font-weight: 500;
    margin-left: 8px;
    letter-spacing: 4px;
}

/* 当窗口 <= 1200px 时取消溢出 */
@media (max-width: 1200px) {
    .zdb-about-img {
        margin-right: 0;
        border-radius: 6px;
    }
    .zdb-about-img img {
        border-radius: 6px;
    }
}

/* 关于我们响应式 */
@media (max-width: 992px) {
    .zdb-about {
        padding: 40px 0;
    }
    .zdb-about-wrap {
        flex-direction: column;
        gap: 28px;
    }
    .zdb-about-text {
        flex: 1 1 auto;
        max-width: 100%;
        order: 2;
    }
    .zdb-about-img {
        flex: 1 1 auto;
        width: 100%;
        margin-left: 0;
        margin-top: 0;
        order: 1;
        border-radius: 6px;
    }
    .zdb-about-img img {
        border-radius: 6px;
        min-height: 220px;
    }
    .zdb-about-company {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .zdb-about-title {
        font-size: 22px;
    }
    .zdb-about-company {
        font-size: 17px;
    }
    .zdb-about-p {
        font-size: 13px;
        line-height: 1.8;
    }
    .zdb-about-btn {
        padding: 9px 22px;
        font-size: 13px;
    }
    .zdb-about-logo {
        font-size: 18px;
    }
    .zdb-about-logo span {
        font-size: 15px;
    }
}