:root {
    --drill1-img: url('pic/pcb/drill1.png');
    --drill2-img: url('pic/pcb/drill2.png');
    --cut-img: url('pic/pcb/cut.png');
    --engrave-img: url('pic/pcb/PCB.png');
}
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei",sans-serif;
}
body{
    padding-top: 130px;
}

/* 固定顶部双层深蓝导航 */
.header-fixed{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: #0F3460;
    z-index: 999;
}

.sidebar-nav {
    position: fixed;
    top: 130px;
    left: 0;
    width: 220px;
    height: calc(100vh - 130px);
    padding: 20px 12px;
    background: #0F3460;
    color: #fff;
    overflow-y: auto;
    z-index: 998;
}
.sidebar-title {
    margin-bottom: 18px;
    font-size: 16px;
    font-weight: 700;
    text-align: center;
}
.sidebar-nav > ul {
    list-style: none;
}
.sidebar-nav > ul > li {
    margin-bottom: 10px;
}
.sidebar-nav > ul > li > a,
.sidebar-group-items > li > a {
    display: block;
    padding: 12px 14px;
    border-radius: 8px;
    color: #fff;
    text-decoration: none;
    border: 1px solid rgba(255,255,255,0.12);
    transition: all 0.25s ease;
}
.sidebar-nav > ul > li > a:hover,
.sidebar-group-items > li > a:hover,
.sidebar-nav > ul > li > a.active,
.sidebar-group-items > li > a.active {
    background: #041e45;
    color: #fff;
    border-color: #3a7dff;
}
/* 一级分类标题样式（首页、在线商城、联系我们） */
.sidebar-nav > ul > li > a[data-lang="nav_home"],
.sidebar-nav > ul > li > a[data-lang="nav_mall"],
.sidebar-nav > ul > li > a[data-lang="nav_contact"] {
    color: #ffd700;
    font-weight: 700;
    font-size: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.15);
    border-radius: 0;
    background: transparent;
}
.sidebar-nav > ul > li > a[data-lang="nav_home"]:hover,
.sidebar-nav > ul > li > a[data-lang="nav_mall"]:hover,
.sidebar-nav > ul > li > a[data-lang="nav_contact"]:hover {
    color: #ffd700;
    background: #041e45;
    border-color: #3a7dff;
}

/* 侧边栏分组 */
.sidebar-group {
    margin-bottom: 10px;
}
.sidebar-group-title {
    padding: 12px 14px;
    font-size: 16px;
    font-weight: 700;
    color: #ffd700;
    border-bottom: 1px solid rgba(255,255,255,0.15);
    margin-bottom: 8px;
    cursor: pointer;
    display: block;
    text-decoration: none;
    transition: all 0.25s ease;
}
.sidebar-group-title a {
    color: inherit;
    text-decoration: none;
    display: block;
    margin: -12px -14px;
    padding: 12px 14px;
}
.sidebar-group-items {
    list-style: none;
    padding-left: 0;
}
.sidebar-group-items > li {
    margin-bottom: 6px;
}

/* 侧边栏下拉菜单（三级） */
.sidebar-dropdown {
    position: relative;
}
.sidebar-submenu {
    display: none;
    list-style: none;
    margin-left: 12px;
    margin-top: 4px;
}
.sidebar-submenu li {
    margin-bottom: 4px;
}
.sidebar-submenu a {
    display: block;
    padding: 6px 12px;
    font-size: 12px;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.04);
    transition: all 0.25s ease;
}
.sidebar-dropdown:hover .sidebar-submenu {
    display: block;
}

.main-page {
    margin-left: 220px;
}

/* 第一行：品牌标题 */
.top-brand{
    text-align: left;
    font-size: 26px;
    font-weight: bold;
    color: #fff;
    padding: 14px 0 14px 40px;
}

/* 第二行：导航容器 */
.nav-box{
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 40px 12px;
    position: relative;
}
/* 导航菜单 */
.nav-menu{
    display: flex;
    list-style: none;
    gap: 35px;
    justify-content: center;
}
.nav-menu li{
    color: #eee;
    font-size: 26px;
    cursor: pointer;
    transition: 0.3s;
}
.nav-menu li:hover{
    color: #41A5FF;
}
.nav-menu a{
    color: inherit;
    text-decoration: none;
}
.nav-menu a.active{
    color: #41A5FF;
    font-weight: bold;
}
.nav-menu .nav-dropdown > span {
    color: inherit;
}

/* 导航栏语言切换 */
.lang-switcher-nav{
    display: flex;
    gap: 5px;
    align-items: center;
    position: absolute;
    right: 40px;
}
.lang-btn{
    padding: 4px 10px;
    border: 1px solid rgba(255,255,255,0.4);
    background: transparent;
    color: #eee;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s;
}
.lang-btn:hover, .lang-btn.active{
    background: #41A5FF;
    border-color: #41A5FF;
    color: #fff;
}

/* 顶部导航下拉菜单 */
.nav-dropdown {
    position: relative;
}
.nav-submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    min-width: 200px;
    border-radius: 0 0 4px 4px;
    box-shadow: 0 6px 12px rgba(0,15,40,0.18);
    padding: 8px 0;
    display: none;
    z-index: 9999;
    list-style: none;
}
.nav-submenu li {
    margin: 0;
    padding: 0;
    font-size: 18px;
    cursor: default;
}
.nav-submenu a {
    display: block;
    padding: 10px 20px;
    color: #333;
    font-size: 14px;
    text-decoration: none;
    transition: 0.2s;
    white-space: nowrap;
}
.nav-submenu a:hover {
    background-color: #0F3460;
    color: #fff;
}
.nav-dropdown:hover .nav-submenu {
    display: block;
}

/* 二级下拉菜单（旧版兼容） */
.dropdown {
    position: relative;
}
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    min-width: 240px;
    border-radius: 0 0 4px 4px;
    box-shadow: 0 6px 12px rgba(0,15,40,0.18);
    padding: 10px 0;
    display: none;
    z-index: 9999;
    transition: all 0.25s ease;
    opacity: 0;
    transform: translateY(10px);
}
.submenu a {
    display: block;
    padding: 11px 25px;
    color: #333;
    font-size: 15px;
    text-decoration: none;
    transition: 0.2s;
}
.submenu a:hover {
    background-color: #0F3460;
    color: #fff;
}
.dropdown:hover .submenu {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* 全屏banner */
.banner-full{
    height: 900px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: flex-start;
}
.banner-inner{
    width: 100%;
    text-align: center;
    color: #fff;
    padding-top: 60px;
}
.banner-inner h1{
    font-size: 48px;
    margin-bottom: 18px;
}
.banner-inner p{
    font-size: 18px;
    margin-bottom: 35px;
}
.btn-blue{
    padding: 14px 40px;
    background: #0066CC;
    border-radius: 4px;
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    cursor: pointer;
}

/* 通用内容容器 */
.container{
    max-width: 1200px;
    margin: 0 auto;
    padding: 70px 20px;
}
.title-center{
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
    color: #0F3460;
}

/* 左右图文板块 */
.about-layout{
    background: #f7f9fc;
}
.about-layout .container{
    display: flex;
    gap: 50px;
    align-items: center;
}
.about-left{
    flex: 1;
}
.about-right{
    flex: 1;
}
.about-right img{
    width: 100%;
    border-radius: 6px;
}
.about-left h2{
    font-size: 30px;
    color: #0F3460;
    margin-bottom: 20px;
}
.about-left p{
    line-height: 1.8;
    color: #444;
    margin-bottom: 12px;
    font-size: 16px;
}

/* 产品卡片网格 */
.product-grid{
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 25px;
}
.pro-card{
    background: #fff;
    padding: 35px 20px;
    text-align: center;
    box-shadow: 0 3px 12px rgba(0,0,0,0.07);
    border-radius: 6px;
    transition: 0.3s;
}
.pro-card:hover{
    transform: translateY(-6px);
    border-top: 3px solid #0066CC;
}
.pro-card h3{
    color: #0F3460;
    margin-bottom: 12px;
}

/* 通用悬停弹出窗口 */
.popup-card{
    position: relative;
    cursor: pointer;
}
.popup-box{
    display: none;
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    padding: 0;
    min-width: 320px;
    max-width: 400px;
    max-height: 320px;
}
.popup-box::before{
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid #fff;
}
.popup-card:hover .popup-box{
    display: block;
}
.popup-box .popup-content{
    padding: 20px;
    text-align: left;
    max-height: 320px;
    overflow-y: auto;
}
.popup-box h4{
    color: #0F3460;
    font-size: 15px;
    margin: 0 0 8px 0;
}
.popup-box p{
    color: #666;
    font-size: 13px;
    line-height: 1.6;
    margin: 0 0 12px 0;
}
.popup-box img{
    width: 100%;
    border-radius: 6px;
    margin-top: 10px;
}

/* 产品矩阵动画 */
.architecture-container{
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    border-radius: 8px;
    /* overflow: hidden; 移除，避免截断弹出的卡片 */
}
.architecture-bg{
    width: 100%;
    display: block;
}

/* 节点介绍文字显示区域 */
.node-description {
    position: absolute;
    bottom: 20px;
    left: 10px;
    right: 10px;
    background: rgba(0, 51, 102, 0.95);
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    text-align: center;
    display: none;
    z-index: 9999;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    pointer-events: none;
}
.node-description.visible {
    display: block;
}
.node-title {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 8px;
    color: #ffd700;
}
.node-text {
    font-size: 14px;
    line-height: 1.5;
    color: #e0e0e0;
}

/* 设备交互热点区域 */
.hotspot-area{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}
.hotspot{
    position: absolute;
    cursor: pointer;
    pointer-events: auto;
    background: transparent;
    border: none;
    transition: all 0.3s;
}
/* 仅用于高亮定位的热区（不可交互） */
.hotspot.no-highlight{
    pointer-events: none;
    cursor: default;
}
.hotspot:hover{
    background: rgba(0, 102, 204, 0.2);
    border: 2px solid rgba(0, 102, 204, 0.6);
    border-radius: 8px;
}

/* 热点位置 - 根据实际图片调整 */
.hotspot-drill{
    top: 8%;
    left: 66%;
    width: 8%;
    height: 18%;
}
.hotspot-cut{
    top: 33%;
    left: 66%;
    width: 8%;
    height: 15%;
}
.hotspot-engrave{
    top: 55%;
    left: 66%;
    width: 8%;
    height: 29%;
}
/* 设备热区细分 */
.hotspot-drill-equipment{
    top: 8%;
    left: 66%;
    width: 8%;
    height: 18%;
}
.hotspot-cut-equipment{
    top: 33%;
    left: 66%;
    width: 8%;
    height: 15%;
}
.hotspot-engrave-equipment{
    top: 55%;
    left: 66%;
    width: 8%;
    height: 29%;
}
/* 产品热区细分 */
.hotspot-drill-product{
    top: 7%;
    left: 82%;
    width: 8%;
    height: 16%;
}
.hotspot-cut-product{
    top: 33%;
    left: 82%;
    width: 8%;
    height: 15%;
}
.hotspot-engrave-product{
    top: 62%;
    left: 82%;
    width: 8%;
    height: 18%;
}

/* 蓝色框热点位置 */
.hotspot-edwin{
    top: 37%;
    left: -0.5%;
    width: 9%;
    height: 12%;
}
.hotspot-circuitcam{
    top: 38%;
    left: 12.5%;
    width: 10.5%;
    height: 11%;
}
.hotspot-mos{
    top: 37%;
    left: 27.5%;
    width: 14%;
    height: 13%;
}
.hotspot-aod{
    top: 13%;
    left: 47%;
    width: 14%;
    height: 16%;
}
.hotspot-lasercard{
    top: 38.5%;
    left: 46.5%;
    width: 14%;
    height: 11%;
}
.hotspot-spindle{
    top: 60%;
    left: 46.5%;
    width: 14%;
    height: 11%;
}
.hotspot-inspect{
    top: 12%;
    left: 95%;
    width: 6.25%;
    height: 72%;
}

/* 蓝色框弹出窗口 */
.hotspot-popup{
    display: none;
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    padding: 0;
    min-width: 320px;
    max-width: 420px;
}
.hotspot-popup::before{
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid #fff;
}

/* 向下弹出的卡片（用于靠近顶部的热点，避免被容器截断） */
.hotspot-popup.popup-down{
    bottom: auto;
    top: calc(100% + 10px);
}
.hotspot-popup.popup-down::before{
    bottom: auto;
    top: -8px;
    border-top: none;
    border-bottom: 8px solid #fff;
}

/* 向右弹出的卡片（用于靠近左侧的热点） */
.hotspot-popup.popup-right{
    bottom: auto;
    top: 50%;
    left: calc(100% + 10px);
    transform: translateY(-50%);
}
.hotspot-popup.popup-right::before{
    bottom: auto;
    top: 50%;
    left: -8px;
    transform: translateY(-50%);
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    border-right: 8px solid #fff;
    border-left: none;
}
.hotspot:hover .hotspot-popup{
    display: block;
}
.hotspot-popup-content{
    padding: 20px;
    text-align: left;
}
.hotspot-popup-content h4{
    color: #0F3460;
    font-size: 17px;
    margin: 0 0 12px 0;
    font-weight: bold;
}
.hotspot-popup-content p{
    color: #555;
    font-size: 14px;
    line-height: 1.7;
    margin: 0 0 15px 0;
}
.hotspot-popup-content img{
    display: block;
    width: auto;
    max-width: 100%;
    max-height: 140px;
    border-radius: 6px;
    margin: 0 auto;
    object-fit: contain;
    background: #f7f9fc;
}

/* 节点高亮遮罩层 */
.node-highlight-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.node-highlight-layer.visible {
    opacity: 1;
}
.node-highlight-box {
    position: absolute;
    border: 3px solid rgba(255, 193, 7, 0.95);
    background: rgba(255, 193, 7, 0.12);
    border-radius: 10px;
    box-shadow: 0 0 25px rgba(255, 193, 7, 0.6), 0 0 60px rgba(255, 193, 7, 0.2);
    animation: highlightPulse 0.5s ease-out forwards;
    z-index: 51;
}
@keyframes highlightPulse {
    0% { transform: scale(0.92); opacity: 0; }
    40% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}

/* 案例展示区 */
.case-section{
    background: #f0f4f9;
}
.case-section .software-item h4 {
    color: #0F3460;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.4;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
}
.case-intro{
    text-align: center;
    color: #444;
    font-size: 16px;
    line-height: 1.8;
    margin-top: 30px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* 页面底部 */
.footer-bottom{
    background: #0F3460;
    color: #fff;
    width: 100%;
    margin: 0;
    padding: 0;
}
.footer-bottom .container{
    display: flex;
    justify-content: space-between;
    padding: 30px 20px 30px 240px;
    max-width: none;
    width: 100%;
    margin: 0;
    box-sizing: border-box;
}
.copyright{
    text-align: center;
    padding: 20px;
    border-top: 1px solid #254b7d;
    color: #ccc;
}

/* 移动端自适应适配 */
@media (max-width:768px){
    .sidebar-nav {
        display: none;
    }
    .main-page {
        margin-left: 0;
    }
    .footer-bottom .container{
        padding-left: 20px;
    }
    .product-grid{
        grid-template-columns: repeat(2,1fr);
    }
    .about-layout .container{
        flex-direction: column;
    }
    .nav-menu{
        gap: 15px;
    }
}

/* 客户咨询弹窗样式 */
.consult-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99999;
    display: none;
    align-items: center;
    justify-content: center;
}

.consult-content {
    background: #fff;
    width: 90%;
    max-width: 500px;
    padding: 30px;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* 关闭按钮 */
.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 24px;
    color: #666;
    cursor: pointer;
    transition: color 0.3s;
}
.close-btn:hover {
    color: #ff4444;
}

/* 咨询按钮样式 */
.consult-btn {
    padding: 14px 40px;
    background: #0066CC;
    border-radius: 4px;
    color: #fff;
    border: none;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}
.consult-btn:hover {
    background: #0F3460;
}

/* 表单样式 */
#consultForm {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}
#consultForm input, #consultForm textarea {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}
.submit-btn {
    padding: 12px;
    background: #0F3460;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
.submit-btn:hover {
    background: #0066CC;
}

/* ==================== 产品页面公共样式 ==================== */

/* 产品详情页通用布局 */
.product-detail {
    max-width: 1200px;
    margin: 150px auto 80px;
    padding: 0 20px;
}
.product-header {
    display: flex;
    gap: 50px;
    align-items: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}
.product-img {
    flex: 1;
    min-width: 300px;
}
.product-img img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.product-brief {
    flex: 1;
    min-width: 300px;
}
.product-brief h1 {
    color: #0F3460;
    font-size: 36px;
    margin-bottom: 25px;
}
.product-brief p {
    line-height: 1.8;
    font-size: 16px;
    color: #444;
    margin-bottom: 15px;
}

/* 视频区域 */
.video-section {
    margin: 80px 0;
}
.video-section h2 {
    color: #0F3460;
    font-size: 28px;
    margin-bottom: 30px;
    border-bottom: 2px solid #f0f4f9;
    padding-bottom: 10px;
}
.video-player-container {
    max-width: 1000px;
    margin: 0 auto;
    background: #f7f9fc;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}
.video-player {
    width: 100%;
    height: 560px;
    border: none;
    border-radius: 6px;
    background: #000;
}
.video-desc {
    margin-top: 15px;
    text-align: center;
    color: #666;
    font-size: 15px;
}
.video-select-wrap {
    margin-bottom: 20px;
}
.video-select {
    padding: 12px 16px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: 6px;
    width: 100%;
    max-width: 400px;
    outline: none;
}
.video-box video {
    display: block;
    width: 100%;
    height: auto;
    outline: none;
}

/* 下载区域 */
.download-section h2 {
    color: #0F3460;
    font-size: 28px;
    margin-bottom: 30px;
    border-bottom: 2px solid #f0f4f9;
    padding-bottom: 10px;
}
.download-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid #e8e8e8;
    border-radius: 6px;
    overflow: hidden;
}
.download-item {
    background: #fff;
    padding: 16px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid #e8e8e8;
}
.download-item:last-child {
    border-bottom: none;
}
.download-item:nth-child(odd) {
    background: #f7f9fc;
}
.download-name {
    color: #333;
    font-size: 16px;
    font-weight: 500;
    flex: 1;
    min-width: 200px;
}
.btn-group {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}
.download-btn {
    padding: 10px 25px;
    background: #0066CC;
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
    font-size: 14px;
    transition: 0.3s;
    display: inline-block;
    text-align: center;
}
.download-btn:hover {
    background: #0F3460;
}
.preview-btn {
    padding: 10px 25px;
    background: #41A5FF;
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
    font-size: 14px;
    transition: 0.3s;
    display: inline-block;
    text-align: center;
    cursor: pointer;
}
.preview-btn:hover {
    background: #0066CC;
}
.preview-btn:disabled {
    background: #999;
    cursor: not-allowed;
    opacity: 0.7;
}

/* PDF预览弹窗 */
.pdf-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.modal-content {
    background: #fff;
    width: 100%;
    max-width: 1200px;
    height: 90vh;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}
.close-modal {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    color: #fff;
    background: #ff4444;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
}
.pdf-preview-container {
    width: 100%;
    height: 100%;
    padding: 10px;
}
.pdf-iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* 产品页面公共样式 - 功能列表 */
.feature-section {
    margin-top: 20px;
}
.feature-title {
    font-size: 16px;
    color: #0F3460;
    font-weight: 600;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e8e8e8;
}
.version-section {
    margin-top: 18px;
}
.version-section .feature-item::before {
    background: #4CAF50;
}
.version-tag {
    display: inline-block;
    padding: 2px 10px;
    background: #0066CC;
    color: #fff;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    margin: 2px 1px;
}

/* 产品页面公共样式 - 产品卡片 */
.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    padding: 25px;
    margin-bottom: 30px;
}
.card-title {
    font-size: 18px;
    color: #2c3e50;
    border-left: 4px solid #3498db;
    padding-left: 15px;
    margin-bottom: 20px;
}
.product-brief p.feature-item {
    position: relative;
    padding-left: 28px;
}
.product-brief p.feature-item::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 2px;
    width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    font-size: 12px;
    font-weight: bold;
    color: white;
    background: #4CAF50;
    border-radius: 3px;
    vertical-align: middle;
}

/* 产品页面公共样式 - 视频播放器 */
.video-player-panel {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: flex-start;
}
.video-container {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
}
.video-container video {
    width: 100%;
    border-radius: 6px;
    outline: none;
}
.video-select-panel {
    width: 320px;
    flex-shrink: 0;
}
.video-select-panel label {
    display: block;
    margin-bottom: 10px;
    font-size: 15px;
    color: #333;
}
.video-select-panel select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    outline: none;
}

/* 产品页面移动端适配 */
@media (max-width:768px) {
    .product-header {
        gap: 30px;
    }
    .product-brief h1 {
        font-size: 28px;
    }
    .download-section h2, .video-section h2 {
        font-size: 24px;
    }
    .video-player {
        height: 280px;
    }
    .btn-group {
        width: 100%;
        justify-content: flex-start;
    }
    .download-btn, .preview-btn {
        flex: 1;
        padding: 10px 15px;
    }
}
@media (max-width:480px) {
    .video-player {
        height: 200px;
    }
}