@charset "UTF-8";

/* 产品详情页样式 - 2026 科技感增强版 */

:root {
    --primary-color: #0b459c;
    --primary-light: #1e5ab3;
    --accent-blue: #4a90e2;
    --tech-blue-glow: rgba(11, 69, 156, 0.15);
    --tech-gradient: linear-gradient(135deg, #0b459c 0%, #1e5ab3 100%);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.5);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --section-bg: #f8faff;
}

.product-detail-main {
    padding-top: 80px;
    background-color: #fff;
    min-height: 100vh;
}

/* 面包屑 - 沉浸式处理 */
.breadcrumb-container {
    background-color: #fff;
    padding: 20px 0;
    border-bottom: none;
}

.breadcrumb {
    font-size: 14px;
    color: #999;
}

.breadcrumb a {
    color: #999;
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

.breadcrumb .current {
    color: #999;
}

/* 产品顶部概览 */
.product-overview-top {
    padding: 20px 0 80px;
    position: relative;
    z-index: 2;
    background-color: #fff;
}

.product-top-flex {
    display: flex;
    gap: 60px;
    align-items: center;
}

.product-gallery {
    flex: 1.1;
    display: flex;
    gap: 20px;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.thumbs-list {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.thumb-item {
    width: 64px;
    height: 64px;
    border: 1px solid #eee;
    border-radius: 4px;
    padding: 4px;
    cursor: pointer;
    background: #fff;
    transition: all 0.3s;
}

.thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 2px;
}

.thumb-item.active {
    border-color: var(--primary-color);
    box-shadow: none;
}

.main-image {
    flex: 1;
    height: 460px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border-radius: 4px;
    border: 1px solid #f5f5f5;
    overflow: hidden;
    position: relative;
    min-width: 0;
}

.main-image::after {
    display: none;
}

.main-image img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    transition: transform 0.3s;
}

.main-image:hover img {
    transform: none;
}

.product-info-panel {
    flex: 0.9;
    min-width: 0;
    padding-left: 40px;
}

.product-title {
    font-size: 48px;
    color: #000;
    margin-bottom: 40px;
    font-weight: bold;
    letter-spacing: 0;
    line-height: 1.2;
}

.basic-specs {
    display: flex;
    gap: 0;
    margin-bottom: 40px;
    padding: 0;
    background: transparent;
    backdrop-filter: none;
    border: none;
    border-radius: 0;
    box-shadow: none;
}

.spec-item {
    display: flex;
    flex-direction: column;
    padding-right: 60px;
    position: relative;
}

.spec-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 30px;
    top: 10%;
    height: 80%;
    width: 1px;
    background-color: #eee;
}

.spec-label {
    font-size: 14px;
    color: #666;
    margin-bottom: 12px;
    text-transform: none;
    letter-spacing: 0;
    font-weight: normal;
}

.spec-value {
    font-size: 32px;
    color: #0b459c;
    font-weight: bold;
}

.protocols {
    margin-bottom: 40px;
}

.protocol-label {
    font-size: 14px;
    color: #333;
    margin-bottom: 15px;
    font-weight: bold;
}

.protocol-logos {
    display: flex;
    gap: 20px;
    align-items: center;
}

.protocol-logos img {
    height: 24px;
    width: auto;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 30px;
    background: transparent;
    color: #0b459c;
    border: 1px solid #0b459c;
    border-radius: 4px;
    font-size: 16px;
    font-weight: normal;
    box-shadow: none;
    transition: all 0.3s;
    cursor: pointer;
}

.contact-btn:hover {
    transform: none;
    background-color: #0b459c;
    box-shadow: none;
    color: #fff;
}

.btn-arrow {
    margin-left: 8px;
    transition: transform 0.3s;
}

.contact-btn:hover .btn-arrow {
    transform: translateX(3px);
}

/* 标签页导航 */
.product-tabs-nav {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 80px;
    z-index: 100;
    transition: all 0.3s;
    margin-top: 0;
}

.tab-list {
    display: flex;
    justify-content: center;
    gap: 80px;
}

.tab-item {
    padding: 25px 0;
    font-size: 18px;
    color: #666;
    cursor: pointer;
    position: relative;
    font-weight: 500;
    transition: all 0.3s;
}

.tab-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 4px;
    background: var(--tech-gradient);
    border-radius: 4px 4px 0 0;
    transition: width 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.tab-item:hover {
    color: var(--primary-color);
}

.tab-item.active {
    color: var(--primary-color);
    font-weight: 700;
}

.tab-item.active::before {
    width: 100%;
}

/* 标签页内容 */
.product-tabs-content {
    padding: 40px 0 100px;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.5s ease-out;
    padding-top: 20px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-pane.active {
    display: block;
}

.content-card {
    background-color: #fff;
    border-radius: 24px;
    padding: 50px;
    margin-bottom: 40px;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
}

.card-title {
    font-size: 24px;
    color: #1a1a1a;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
    font-weight: 800;
}

.card-desc {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 35px;
}

.centered-video {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.centered-video video {
    width: 100%;
    display: block;
}

/* 外形尺寸图网格 */
.drawing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.drawing-item {
    background: #fff;
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.model-name {
    font-size: 16px;
    color: #1a1a1a;
    margin-bottom: 20px;
    font-weight: 700;
}

.drawing-item:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: 0 15px 35px rgba(0,0,0,0.08);
}

.drawing-img {
    height: 400px;
    background: #fcfdff;
    border-radius: 12px;
    margin-top: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 头部导航覆盖 - 还原 */
.header {
    background: var(--primary-color) !important;
    backdrop-filter: none;
    border-bottom: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 沉浸式背景增强 */
.product-detail-main::before {
    display: none;
}

/* 按钮图标与细节 */
.icon-list, .icon-circle, .icon-table {
    background-color: var(--primary-color) !important;
    box-shadow: none;
}

.card-separator {
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, #eee, transparent);
    margin-bottom: 35px;
}

/* 一体化机器人关节模组展示 */
.component-showcase {
    margin: 0 auto;
}

.component-grid-img img,
.exploded-view-img img,
.model-comparison img,
.feature-img img {
    width: 90%;
    height: auto;
    display: block;
    border-radius: 12px;
    margin: 0 auto;
}

.exploded-view-img {
    margin-top: 60px;
}

/* 结构紧凑区块 */
.compact-structure {
    margin: 0 auto;
}

.model-comparison {
    margin-bottom: 60px;
}

.arm-design-box {
    margin-top: 40px;
    text-align: left;
}

.arm-design-text {
    margin-bottom: 30px;
}

.arm-design-text h4 {
    color: var(--primary-color);
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 8px;
}

.arm-design-text p {
    font-size: 14px;
    color: #666;
    margin-bottom: 0;
}

.arm-design-img img {
    width: 100%;
    height: auto;
    display: block;
}

/* 功能特点拆分行 */
.feature-item-row {
    margin-bottom: 80px;
    padding-bottom: 80px;
    border-bottom: 1px solid #f5f5f5;
}

.feature-item-row:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.feature-item-row.split {
    display: flex;
    align-items: center;
    gap: 80px;
}

.feature-item-row.reverse {
    flex-direction: row-reverse;
}

.feature-info {
    flex: 1;
}

.feature-info h3 {
    font-size: 32px;
    color: #1a1a1a;
    margin-bottom: 20px;
    font-weight: bold;
    line-height: 1.2;
}

.feature-info p {
    font-size: 17px;
    color: #333;
    line-height: 1.6;
}

.feature-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.feature-visual img {
    max-width: 100%;
    height: auto;
    border-radius: 0;
    box-shadow: none;
}

.protocol-icons-inline {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    align-items: center;
}

.protocol-icons-inline img {
    height: 20px;
    width: auto;
}

@media (max-width: 1024px) {
    .feature-item-row.split {
        flex-direction: column;
        gap: 40px;
        text-align: center;
    }
    .feature-item-row.reverse {
        flex-direction: column;
    }
    .protocol-icons-inline {
        justify-content: center;
    }
    .design-feature {
        flex-direction: column;
        text-align: center;
    }
    .comparison-btns {
        justify-content: center;
    }
}

.drawing-img img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

/* 一体化模组组件网格优化 */
.component-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin: 40px 0;
}

/* 下载部分优化 */
/* 已移动到下方资料下载部分统一管理 */

/* 响应式微调 */
@media (max-width: 768px) {
    .product-title {
        font-size: 32px;
    }
    .basic-specs {
        flex-direction: column;
        gap: 25px;
        padding: 20px;
    }
    .content-card {
        padding: 30px 20px;
    }
    .drawing-img {
        height: 250px;
    }
}

/* 一体化模组组件网格 */
.component-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.component-item {
    text-align: center;
}

.component-item img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    margin-bottom: 15px;
    transition: transform 0.3s;
}

.component-item:hover img {
    transform: scale(1.1);
}

.component-item span {
    display: block;
    font-size: 14px;
    color: #333;
    background-color: #0b459c;
    color: #fff;
    padding: 5px 10px;
    border-radius: 4px;
}

.exploded-view img {
    width: 100%;
    margin-top: 40px;
}

/* 结构描述 */
.structure-flex {
    display: flex;
    justify-content: space-around;
    gap: 40px;
    margin-bottom: 50px;
}

.structure-item {
    text-align: center;
    flex: 1;
}

.structure-item h4 {
    font-size: 20px;
    color: #333;
    margin-bottom: 10px;
}

.structure-item p {
    color: #999;
    margin-bottom: 20px;
}

.structure-item img {
    max-width: 100%;
}

.comparison-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
}

.comp-text {
    text-align: center;
}

.comp-text p {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
}

.comp-btn {
    padding: 10px 25px;
    border-radius: 4px;
    font-size: 16px;
    color: #fff;
}

.comp-btn.gray {
    background-color: #999;
}

.comp-btn.blue {
    background-color: var(--primary-color);
}

.comp-arrow img {
    width: 40px;
}

/* 规格参数图片 */
.spec-image-box {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.spec-image-box img {
    display: block;
    max-width: 100%;
    margin: 0 auto;
}

/* 移动端：参数表图片保持原始清晰度，横向滑动查看 */
@media (max-width: 768px) {
    .spec-image-box img {
        width: 760px;
        max-width: none;
        margin: 0 auto;
    }
}

/* 规格参数表格 */
.table-responsive {
    overflow-x: auto;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.spec-table th, .spec-table td {
    padding: 15px 20px;
    text-align: left;
    border: 1px solid #eee;
}

.spec-table th {
    background-color: #0b459c;
    color: #fff;
    font-weight: normal;
}

.spec-table tr:nth-child(even) {
    background-color: #fcfcfc;
}

.spec-table td:first-child {
    background-color: #f5f6f8;
    font-weight: bold;
    width: 200px;
}

/* 选型表 */
.selection-box {
    text-align: center;
}

.selection-box img {
    max-width: 100%;
    margin-bottom: 30px;
}

.model-result {
    display: inline-flex;
    align-items: center;
    gap: 20px;
    background-color: #f0f4f8;
    padding: 15px 40px;
    border-radius: 30px;
    border: 1px solid #0b459c;
}

.model-result .label {
    background-color: #0b459c;
    color: #fff;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 14px;
}

.model-result .value {
    font-size: 20px;
    color: #333;
    font-weight: bold;
    letter-spacing: 1px;
}

/* 资料下载过滤器优化 */
.resource-filters {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding-bottom: 30px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 0;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    transition: all 0.3s;
    position: relative;
}

.filter-btn:hover {
    color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: #fff;
    padding: 8px 25px;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(11, 69, 156, 0.2);
}

/* 下载列表优化 */
.resource-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.resource-item {
    background: #fff;
    border: 1px solid #f0f0f0;
    border-radius: 12px;
    padding: 25px 35px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
}

.resource-item:hover {
    border-color: #e0e0e0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

.res-info h4 {
    font-size: 18px;
    color: #1a1a1a;
    margin-bottom: 12px;
    font-weight: 600;
}

.res-info p {
    font-size: 14px;
    color: #999;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 25px;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    background: #fff;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
}

.download-btn img {
    filter: brightness(0) saturate(100%) invert(20%) sepia(86%) show(4663%) hue-rotate(204deg) brightness(96%) contrast(102%);
}

.download-btn:hover {
    background: var(--primary-color);
    color: #fff;
    transform: none;
    box-shadow: none;
}

.download-btn:hover img {
    filter: brightness(0) invert(1);
}

/* 特殊项展示 - 模拟图中最后一个选中状态 */
.resource-item.active {
    background: #fff;
}

.resource-item.active .download-btn {
    background: var(--primary-color);
    color: #fff;
}

.resource-item.active .download-btn img {
    filter: brightness(0) invert(1);
}

/* 揭示动画增强 */
.reveal {
    opacity: 0;
    transition: all 1s cubic-bezier(0.23, 1, 0.32, 1);
    will-change: transform, opacity;
}

.reveal.reveal-up {
    transform: translateY(40px) scale(0.98);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* 一体化模组组件网格优化 */
.component-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin: 40px 0;
}

.component-item {
    background: #fcfdff;
    padding: 25px;
    border-radius: 16px;
    border: 1px solid rgba(0,0,0,0.03);
    transition: all 0.3s;
}

.component-item:hover {
    background: #fff;
    box-shadow: var(--card-shadow);
    transform: translateY(-5px);
}

.component-item span {
    background: var(--tech-gradient) !important;
    padding: 6px 15px !important;
    font-weight: 600 !important;
}

/* 移动端：头部导航切换为汉堡菜单模式（header 高度 60px） */
@media (max-width: 1024px) {
    .product-detail-main {
        padding-top: 60px;
    }
    .product-tabs-nav {
        top: 60px;
    }
}

@media (max-width: 768px) {
    .product-detail-main {
        padding-top: 60px;
    }
    .breadcrumb-container {
        padding: 12px 0;
    }
    .breadcrumb {
        font-size: 13px;
    }
    .product-overview-top {
        padding: 40px 0;
    }
    .product-top-flex {
        gap: 30px;
    }
    .product-gallery {
        flex-direction: column-reverse;
        gap: 15px;
    }
    .thumbs-list {
        flex-direction: row;
        justify-content: center;
        gap: 12px;
    }
    .thumb-item {
        width: 62px;
        height: 62px;
        padding: 4px;
    }
    .main-image {
        height: 280px;
    }
    .product-title {
        font-size: 26px;
        margin-bottom: 25px;
        text-align: center;
    }
    .basic-specs {
        flex-direction: column;
        gap: 20px;
        margin-bottom: 30px;
        align-items: center;
        text-align: center;
    }
    .spec-value {
        font-size: 20px;
    }
    .contact-btn {
        padding: 10px 30px;
        font-size: 15px;
    }
    .action-btns {
        text-align: center;
    }
    /* 手机/平板下通信协议图标居中显示 */
    .protocol-logos {
        justify-content: center;
    }
    /* 标签页导航 */
    .product-tabs-nav {
        top: 60px;
    }
    .tab-list {
        gap: 30px;
    }
    .tab-item {
        padding: 15px 0;
        font-size: 15px;
    }
    .product-tabs-content {
        padding: 25px 0 50px;
    }
    .content-card {
        padding: 22px;
        border-radius: 10px;
        margin-bottom: 20px;
    }
    .card-title {
        font-size: 18px;
        margin-bottom: 18px;
    }
    .card-separator {
        margin-bottom: 18px;
    }
    .card-desc {
        font-size: 14px;
        margin-bottom: 20px;
    }
    /* 外形尺寸图网格：移动端改为单列 */
    .drawing-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    .drawing-item {
        padding: 14px;
    }
    .drawing-img {
        height: auto;
    }
    .comparison-box {
        flex-direction: column;
    }
    .resource-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
        padding: 20px;
    }
    .download-btn {
        width: 100%;
        justify-content: center;
    }
    .resource-filters {
        flex-wrap: wrap;
    }
}

/* 小屏手机（iPhone SE 等）进一步收紧 */
@media (max-width: 480px) {
    .product-title {
        font-size: 22px;
    }
    .thumb-item {
        width: 54px;
        height: 54px;
    }
    .main-image {
        height: 220px;
    }
    .tab-list {
        gap: 0;
        justify-content: space-between;
    }
    .tab-item {
        font-size: 14px;
        padding: 12px 0;
        flex: 1;
        text-align: center;
    }
    .resource-filters {
        gap: 10px;
    }
    .filter-btn {
        padding: 6px 14px;
        font-size: 13px;
    }
    .res-info h4 {
        font-size: 15px;
    }
    .download-btn {
        padding: 10px 18px;
        font-size: 14px;
    }
    .centered-video {
        border-radius: 10px;
    }
}

/* ==================== 移动端样式全面优化 ==================== */
/* 说明：以下规则统一追加于文件末尾，覆盖并完善各断点的手机版表现 */

/* 平板 / 小屏（≤1024px） */
@media (max-width: 1024px) {
    /* 顶部概览：改为纵向排列 */
    .product-top-flex {
        flex-direction: column;
        align-items: stretch;
        gap: 30px;
    }
    .product-gallery {
        flex: none;
        width: 100%;
        max-width: 560px;
        margin: 0 auto;
    }
    .product-info-panel {
        flex: none;
        width: 100%;
        padding-left: 0;
        text-align: center;
    }
    .basic-specs {
        justify-content: center;
    }
    /* 隐藏规格项之间的分隔线 */
    .spec-item:not(:last-child)::after {
        display: none;
    }
    .vertical-line {
        display: none;
    }
    .action-btns {
        text-align: center;
    }
    /* 移动端去掉不必要的悬浮效果 */
    .drawing-item:hover,
    .thumb-item:hover,
    .download-btn:hover,
    .contact-btn:hover {
        transform: none;
    }
}

/* 手机横屏 / 平板竖屏（≤768px） */
@media (max-width: 768px) {
    /* 面包屑：单行不换行，超出隐藏 */
    .breadcrumb-container {
        overflow: hidden;
    }
    .breadcrumb {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    /* 顶部概览 */
    .product-overview-top {
        padding: 30px 0 40px;
    }
    .product-gallery {
        max-width: 100%;
    }
    .thumbs-list {
        gap: 10px;
    }
    .thumb-item {
        width: 58px;
        height: 58px;
    }
    .main-image {
        height: 300px;
    }
    .main-image img {
        max-width: 96%;
        max-height: 96%;
    }
    .product-title {
        font-size: 26px;
        margin-bottom: 22px;
    }
    .basic-specs {
        gap: 15px;
        margin-bottom: 25px;
    }
    .spec-item {
        padding-right: 0;
        padding: 0 20px;
    }
    .spec-value {
        font-size: 22px;
    }
    .contact-btn {
        padding: 10px 28px;
        font-size: 15px;
    }
    /* 标签页导航 */
    .tab-list {
        gap: 20px;
    }
    .tab-item {
        font-size: 15px;
        padding: 13px 0;
    }
    /* 内容卡片 */
    .content-card {
        padding: 22px;
        border-radius: 14px;
        margin-bottom: 20px;
    }
    .card-title {
        font-size: 18px;
        margin-bottom: 16px;
    }
    .card-desc {
        font-size: 14px;
        line-height: 1.7;
        margin-bottom: 20px;
    }
    /* 外形尺寸图：保持两列，紧凑显示 */
    .drawing-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    .drawing-item {
        padding: 12px;
        border-radius: 10px;
    }
    .model-name {
        font-size: 14px;
        margin-bottom: 10px;
    }
    .drawing-img {
        height: auto;
        min-height: 120px;
    }
    /* detail2 特有：一体化模组与爆炸图间距 */
    .component-showcase,
    .compact-structure {
        width: 100%;
    }
    .exploded-view-img {
        margin-top: 40px;
    }
    .arm-design-box {
        text-align: center;
    }
    .arm-design-text h4 {
        font-size: 15px;
    }
    .arm-design-text p {
        font-size: 13px;
    }
    /* 功能特点：文字与图片纵向排列 */
    .feature-item-row.split {
        gap: 30px;
        margin-bottom: 50px;
        padding-bottom: 50px;
    }
    .feature-info h3 {
        font-size: 24px;
        margin-bottom: 15px;
    }
    .feature-info p {
        font-size: 15px;
        line-height: 1.7;
    }
    .feature-visual img {
        width: 100%;
    }
    /* 资料下载 */
    .resource-filters {
        gap: 15px;
        padding-bottom: 20px;
        margin-bottom: 25px;
    }
    .filter-btn {
        font-size: 14px;
        padding: 7px 0;
    }
    .filter-btn.active {
        padding: 7px 18px;
    }
    .resource-item {
        padding: 18px 20px;
        border-radius: 10px;
    }
    .res-info h4 {
        font-size: 16px;
        margin-bottom: 8px;
    }
    .res-info p {
        font-size: 13px;
    }
    .download-btn {
        padding: 9px 22px;
        font-size: 14px;
    }
}

/* 手机竖屏主流宽度（≤560px） */
@media (max-width: 560px) {
    /* 规格参数：纵向排列 */
    .basic-specs {
        flex-direction: column;
        gap: 18px;
    }
    .spec-item {
        padding: 0;
    }
    .spec-value {
        font-size: 20px;
    }
    /* 外形尺寸图：单列 */
    .drawing-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .drawing-img {
        min-height: 0;
    }
    /* 主图与缩略图 */
    .main-image {
        height: 260px;
    }
    .thumb-item {
        width: 52px;
        height: 52px;
    }
    /* 标签页 */
    .tab-list {
        gap: 10px;
    }
    .tab-item {
        font-size: 14px;
        padding: 12px 0;
        flex: 1;
        text-align: center;
    }
    /* 资料下载按钮：垂直堆叠 */
    .resource-filters {
        justify-content: flex-start;
    }
    .resource-item {
        gap: 15px;
    }
    .download-btn {
        width: 100%;
        justify-content: center;
    }
}

/* 小屏手机（≤400px）进一步收紧 */
@media (max-width: 400px) {
    .product-title {
        font-size: 22px;
    }
    .main-image {
        height: 220px;
    }
    .thumb-item {
        width: 48px;
        height: 48px;
    }
    .content-card {
        padding: 16px;
    }
    .card-title {
        font-size: 16px;
    }
    .filter-btn {
        font-size: 13px;
    }
    .filter-btn.active {
        padding: 6px 14px;
    }
    .feature-info h3 {
        font-size: 20px;
    }
}