* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft YaHei", Arial, sans-serif;
        }
        
        body {
            color: #333;
            max-width: 100%;
            overflow-x: hidden;
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 导航栏样式 */
/* 修改导航栏容器样式 */
.pchh {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

        /* 调整 logo 样式 */
        .logo {
            width: 240px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        /* 调整导航桌面版样式 */
        .nav-desktop {
            width: calc(100% - 240px);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* 修改 header 样式，移除不必要的 flex */
        header {
            height: 60px;
            border-bottom: 1px solid #1a73e8;
            padding: 0 20px;
            position: relative;
            background: white;
        }
       
        
        .nav-menu {
            display: flex;
            margin-left: 30px;
        }
        
        .nav-menu a {
            text-decoration: none;
            color: #333;
            font-size: 16px;
            margin: 0 15px;
            padding: 10px 0;
            position: relative;
        }
        
        .nav-menu a.active {
            color: #1a73e8;
        }
        
        .nav-menu a.active:after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 100%;
            height: 2px;
            background: #1a73e8;
        }
        
        .nav-buttons {
            display: flex;
            align-items: center;
        }
        
        .nav-btn {
            background: #1a73e8;
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 4px;
            margin-left: 15px;
            cursor: pointer;
            font-size: 14px;
        }
        
        .phone {
            display: flex;
            align-items: center;
            margin-left: 20px;
            color: #1a73e8;
        }
        
        .phone i {
            margin-right: 5px;
        }
        
        /* 移动端导航 */
        .mobile-menu-btn {
            display: none;
            font-size: 24px;
            cursor: pointer;
            margin-left: auto;
        }
        
        .nav-mobile {
            display: none;
            position: absolute;
            top: 80px;
            left: 0;
            width: 100%;
            background: white;
            z-index: 100;
            box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        }
        
        .nav-mobile a {
            display: block;
            padding: 15px 20px;
            color: #333;
            text-decoration: none;
            border-bottom: 1px solid #eee;
        }
        
        .nav-mobile a.active {
            color: #1a73e8;
        }
        
        .mobile-buttons {
            padding: 15px 20px;
            display: flex;
            flex-direction: column;
        }
        
        .mobile-buttons .nav-btn {
            margin: 5px 0;
            width: 100%;
        }
        
        .mobile-phone {
            padding: 15px 20px;
            display: flex;
            align-items: center;
            color: #1a73e8;
        }
        
        /* 轮播图 */
        .slider {
            width: 100%;
            height: 544px;
            position: relative;
            overflow: hidden;
        }
        
        .slider-container {
            width: 100%;
            height: 100%;
            display: flex;
            transition: transform 0.5s ease;
        }
        
        .slide {
            min-width: 100%;
            height: 100%;
            background: #ddd;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: bold;
        }
        
        .slider-indicators {
            position: absolute;
            bottom: 40px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
        }
        
        .indicator {
            width: 30px;
            height: 4px;
            background: #ccc;
            margin: 0 5px;
            cursor: pointer;
        }
        
        .indicator.active {
            background: #1a73e8;
        }
        
        /* 四个特色板块 */
        .features {
            display: flex;
            margin-top: -50px;
            position: relative;
            z-index: 10;
            padding: 0 15px;
        }
        
        .feature-box {
            flex: 1;
            margin: 0 20px;
            padding: 30px 20px;
            border-radius: 15px;
            color: white;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .feature-box h3 {
            font-size: 20px;
            margin-bottom: 15px;
        }
        
        .feature-box p {
            font-size: 16px;
            line-height: 1.5;
        }
        
        .feature-box:nth-child(1) {
            background: linear-gradient(135deg, #2dc142, #2ab061);
        }
        
        .feature-box:nth-child(2) {
            background: linear-gradient(135deg, #3c79db, #3963c8);
        }
        
        .feature-box:nth-child(3) {
            background: linear-gradient(135deg, #60799f, #435d85);
        }
        
        .feature-box:nth-child(4) {
            background: linear-gradient(135deg, #dda432, #be8310);
        }
        
        /* 为什么选择腾讯企业邮箱 */
        .section-title {
            text-align: center;
            margin: 60px 0 30px;
        }
        
        .section-title h2 {
            font-size: 32px;
            font-weight: bold;
            margin-bottom: 15px;
        }
        
        .section-title p {
            font-size: 16px;
            color: #666;
        }
        
        .advantages {
            display: flex;
            flex-wrap: wrap;
            margin: 30px -15px;
        }
        
        .advantage-box {
            flex: 1;
            min-width: 250px;
            margin: 15px;
            padding: 30px;
            background: white;
            border-radius: 5px;
            transition: all 0.3s ease;
        }
        
        .advantage-box:hover {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            transform: translateY(-5px);
        }
        
        .advantage-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: #f0f7ff;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: #1a73e8;
            font-size: 30px;
        }
        
        .advantage-box h3 {
            font-size: 18px;
            font-weight: bold;
            text-align: center;
            margin-bottom: 20px;
        }
        
        .advantage-box p {
            font-size: 14px;
            color: #666;
            line-height: 23px;
        }
        
        .btn-group {
            display: flex;
            justify-content: center;
            margin: 40px 0;
        }
        
        .btn {
            padding: 12px 45px;
            border-radius: 4px;
            font-size: 16px;
            cursor: pointer;
            margin: 0 20px;
        }
        
        .btn-primary {
            background: #1a73e8;
            color: white;
            border: none;
        }
        
        .btn-outline {
            background: white;
            color: #1a73e8;
            border: 1px solid #1a73e8;
        }
        
        /* 腾讯企业邮箱开通注册 */
        .registration-advantages {
            display: flex;
            flex-wrap: wrap;
            margin: 30px -15px;
            position: relative;
        }
        
        .registration-box {
            flex: 1;
            min-width: 200px;
            margin: 15px;
            padding: 30px;
            border-radius: 5px;
            transition: all 0.3s ease;
            position: relative;
            
        }
        
        .arrow-icon {
            position: absolute;
            top: 25%;
            right: -20px;
            transform: translateY(-50%);
            color: #1a73e8;
            font-size: 24px;
        }
        
        /* 收费标准 */
        .pricing {
            display: flex;
            margin: 30px 0;
        }
        
        .pricing-left {
            width: 25%;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            overflow: hidden;
        }
        
        .pricing-header {
            height: 250px;
            background: linear-gradient(to bottom, #fde4c2, #e5c597);
            padding: 30px;
            
            text-align: center;
        }
        
        .pricing-header h3 {
            font-size: 26px;
            font-weight: bold;
            color: #5a4322;
            margin-bottom: 15px;
        }
        
        .pricing-header p {
            font-size: 16px;
            color: #5a4322;
            margin-bottom: 20px;
        }
        
        .price {
            font-size: 30px;
            font-weight: bold;
            color: #5a4322;
            margin-bottom: 25px;
        }
        
        .price span {
            font-size: 20px;
        }
        
        .pricing-buttons {
            display: flex;
            justify-content: center;
        }
        
        .pricing-btn {
            width: 45%;
            padding: 4px 0;
            margin: 0 5px;
            background: white;
            border-radius: 2px;
            border: none;
            color: #5a4322;
            font-size: 15px;
            cursor: pointer;
        }
        
        .pricing-features {
            padding: 30px;
        }
        
        .feature-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 16px;
            margin-bottom: 15px;
        }
        
        .feature-item i {
            color: #d4a017;
        }
        
        .buy-btn {
            display: block;
            width: 180px;
            height: 50px;
            margin: 30px auto;
            background: linear-gradient(to right, #f8f3e6, #e8d8b5);
            border: none;
            border-radius: 5px;
            font-size: 18px;
            color:#5a4322;
            font-weight: bold;
            cursor: pointer;
        }
        
        .pricing-right {
            width: 73%;
            margin-left: 2%;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            overflow: hidden;
        }
        
        .premium-header {
            height: 250px;
            background-image: url(/images/vip.png);
            background-size: 100% 100%;
            padding: 30px;
            text-align: center;
        }
        
        .premium-header h3 {
            font-size: 26px;
            font-weight: bold;
            color: white;
            margin-bottom: 15px;
        }
        
        .premium-header p {
            font-size: 16px;
            color: white;
            margin-bottom: 20px;
        }
        
        .premium-btn {
            width: 90%;
            padding: 12px 0;
            background: white;
            border-radius: 4px;
            border: none;
            color: #1a3e8c;
            font-size: 16px;
            cursor: pointer;
        }
        
        .premium-features {
            padding: 30px;
            display: flex;
        }
        
        .premium-column {
            flex: 1;
            padding: 0 15px;
        }
        
        .premium-icon {
            font-size: 60px;
            color: #1a73e8;
            margin-bottom: 20px;
        }
        
        .premium-column h4 {
            font-size: 18px;
            margin-bottom: 20px;
        }
        
        .premium-item {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .premium-item i {
            color: #1a73e8;
            margin-right: 10px;
        }
        
        .learn-more {
            display: block;
            width: 180px;
            height: 50px;
            margin: 30px auto 0;
            background: #1a73e8;
            border: none;
            border-radius: 5px;
            font-size: 18px;
            font-weight: bold;
            color: white;
            cursor: pointer;
            margin-left: 0px;
        }
        
        /* 专业、安全、专属的企业邮箱服务 */
        .security-tabs {
            display: flex;
            justify-content: center;
            margin: 30px 0;
            background: #f0f7ff;
            border: 1px solid #1a73e8;
            border-radius: 4px;
            padding: 1px;
        }
        
        .security-tab {
            flex: 1;
            text-align: center;
            padding: 15px;
            font-size: 18px;
            font-weight: bold;
            color: #5a8fd8;
            cursor: pointer;
            position: relative;
        }
        
        .security-tab i {
            margin-right: 8px;
        }
        
        .security-tab.active {
            background: #1a73e8;
            color: white;
            border-radius: 4px;
        }

        .security-tab .on {display: none;}
        .security-tab .no {display: block;}

        .security-tab.active .on {display: block;}
        .security-tab.active .no {display: none;}


        .security-content {
            display: none;
        }
        
        .security-content.active {
            display: block;
        }
        
        .security-grid {
            display: flex;
            flex-wrap: wrap;
            margin: 20px -10px;
        }
        
        .security-box {
            flex: 1;
            min-width: 30%;
			max-width: 30%;
            margin: 10px;
            padding: 20px;
            background-image: url(/images/bb.png);
            background-size: 100% 100%;
            border: 3px solid white;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .security-box h4 {
            font-size: 20px;
            font-weight: bold;
            margin-bottom: 15px;
        }
        
        .security-box p {
            font-size: 16px;
            font-weight: bold;
            color: #333;
        }
        
        /* 腾讯企业邮箱内外协作 */
        .collaboration-tabs {
            display: flex;
            justify-content: center;
            margin: 30px 0;
            border-bottom: 1px solid #e0e9ff;
        }
        
        .collaboration-tab {
            width: 140px;
            text-align: center;
            padding: 15px;
            font-size: 18px;
            color: #8ba8d8;
            cursor: pointer;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        
        .collaboration-tab i {
            margin-right: 8px;
        }
        
        .collaboration-tab.active {
            color: #1a73e8;
            font-weight: bold;
        }
        
        .collaboration-tab.active:after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 50%;
            height: 4px;
            background: #1a73e8;
            border-radius: 2px;
        }
        
        .collaboration-content {
            display: none;
        }
        
        .collaboration-content.active {
            display: flex;
            align-items: center;
            margin: 30px 0;
        }
        
        .collaboration-text {
            flex: 1;
            padding-right: 30px;
        }
        
        .collaboration-text h3 {
            font-size: 30px;
            font-weight: bold;
            margin-bottom: 20px;
        }
        
        .collaboration-text p {
            font-size: 16px;
            line-height: 1.6;
            margin-bottom: 30px;
        }
        
        .collaboration-image {
            flex: 1;
        }
        
        .collaboration-image img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 0 auto;
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .features {
                flex-wrap: wrap;
            }
            
            .feature-box {
                min-width: calc(50% - 20px);
                margin-bottom: 20px;
            }
            
            .pricing {
                flex-direction: column;
            }
            
            .pricing-left, .pricing-right {
                width: 100%;
                margin: 0 0 20px 0;
            }
            
            .premium-features {
                flex-wrap: wrap;
            }
            
            .premium-column {
                min-width: 100%;
                margin-bottom: 30px;
            }
        }
        
        @media (max-width: 992px) {
            .advantages, .registration-advantages {
                flex-direction: column;
            }
            
            .advantage-box, .registration-box {
                margin: 10px 0;
            }
            
            .arrow-icon {
                display: none;
            }
            
            .security-grid {
                flex-direction: column;
            }
            
            .collaboration-content.active {
                flex-direction: column;
            }
            
            .collaboration-text {
                padding-right: 0;
                margin-bottom: 30px;
            }
        }
        
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .slider {
                height: 300px;
            }
            
            .feature-box {
                min-width: 100%;
            }
            
            .security-tabs {
                flex-wrap: wrap;
            }
            
            .security-tab {
                min-width: 50%;
            }
            
            .collaboration-tabs {
                flex-wrap: wrap;
            }
            
            .collaboration-tab {
                min-width: 50%;
            }
        }
        
        @media (max-width: 576px) {
            .btn-group {
                flex-direction: column;
                align-items: center;
            }
            
            .btn {
                margin: 5px 0;
                width: 80%;
            }
            
            .pricing-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .pricing-btn {
                width: 80%;
                margin: 5px 0;
            }
            
            .security-tab {
                min-width: 100%;
            }
            
            .collaboration-tab {
                min-width: 100%;
            }
        }
    /* 腾讯企业邮箱热门资讯 */
.news-container {
    display: flex;
    margin: 30px 0;
    position: relative;
}

.news-column {
    flex: 1;
    width: 33.3333333%;
    padding: 0 20px;
    position: relative;
}

.news-column:not(:last-child):after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 100%;
    background: #d1d1d1;
}

.column-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.column-header i {
    color: #1a73e8;
    margin-right: 10px;
    font-size: 18px;
}

.column-header h3 {
    font-size: 22px;
    font-weight: bold;
    color: #1a73e8;
}

.news-item {
    height: 60px;
    display: flex;
    align-items: center;
    border-bottom: 1px dashed #e0e0e0;
}

.news-content {
    width: 100%;
    display: flex;
    align-items: center;
    position: relative;
}

.news-bullet {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: #1a73e8;
    border-radius: 50%;
    margin-right: 15px;
}

.news-title {
    flex: 1;
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 20px;
}

.news-date {
    display: flex;
    align-items: center;
    color: #666;
    font-size: 16px;
}

.news-date i {
    margin-right: 5px;
    color: #666;
    font-size: 14px;
}

@media (max-width: 768px) {
    .news-container {
        flex-direction: column;
    }
    
    .news-column {
        margin-bottom: 30px;
        padding: 0;
    }
    
    .news-column:after {
        display: none;
    }
}