/* 全局样式 */
    body {
        min-height: 1024px;
        background-color: #ffffff;
        margin: 0;
        padding: 0;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    }

    /* 颜色定义 */
    .primary-color {
        color: #4F7AFF;
    }

    /* 导航栏样式 */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background-color: rgba(255, 255, 255, 0.8);
        backdrop-filter: blur(12px);
        z-index: 50;
        border-bottom: 1px solid #f0f0f0;
    }

    .header-container {
        max-width: 1440px;
        margin: 0 auto;
        padding: 0 1rem;
        height: 4rem;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .header-logo {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .logo-text {
        font-size: 1.25rem;
        color: #4F7AFF;
    }

    .site-title {
        font-size: 1rem;
        font-weight: 500;
    }

    .header-nav {
        display: none;
        /* 移动端导航默认隐藏，通过JavaScript控制显示 */
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .header-nav.active {
        display: flex;
    }

    .nav-link {
        text-decoration: none;
        padding: 0.5rem 0;
    }

    .nav-link.active {
        color: #4F7AFF;
        font-weight: 500;
    }

    .nav-link:not(.active) {
        color: #4B5563;
    }

    .nav-link:not(.active):hover {
        color: #4F7AFF;
    }

    /* 移动端导航菜单按钮 */
    .menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 1.5rem;
        height: 1.25rem;
        cursor: pointer;
    }

    .menu-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background-color: #4F7AFF;
        border-radius: 2px;
        transition: all 0.3s ease;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: translateY(0.5rem) rotate(45deg);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: translateY(-0.5rem) rotate(-45deg);
    }

    /* 英雄区域样式 */
    .hero-section {
        position: relative;
        height: 400px;
        overflow: hidden;
    }

    .hero-bg {
        position: absolute;
        inset: 0;
        background-image: url('https://ai-public.mastergo.com/ai/img_res/2d8b56c78f96c021b647f348b0cbfbb8.jpg');
        background-size: cover;
        background-position: center;
    }

    .hero-content {
        position: relative;
        height: 100%;
        max-width: 1440px;
        margin: 0 auto;
        padding: 0 1rem;
        display: flex;
        align-items: center;
    }

    .hero-text {
        width: 100%;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
        font-weight: bold;
        color: white;
        margin-bottom: 1.5rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1.5rem;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.9);
        margin-bottom: 2rem;
    }

    .hero-description {
        font-size: 1rem;
        color: rgba(255, 255, 255, 0.8);
        margin-bottom: 2rem;
    }

    .hero-buttons {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .btn {
        border-radius: 4px;
        padding: 0.75rem 1.5rem;
        font-weight: 500;
        cursor: pointer;
        transition: background-color 0.2s;
        white-space: nowrap;
        text-decoration: none;
        display: inline-block;
        text-align: center;
        width: 100%;
        max-width: 200px;
        font-size:13px;
    }

    .btn-primary {
        background-color: #4F7AFF;
        color: white;
    }

    .btn-primary:hover {
        background-color: rgba(79, 122, 255, 0.9);
    }

    .btn-white {
        background-color: white;
        color: #4F7AFF;
    }

    .btn-white:hover {
        background-color: rgba(255, 255, 255, 0.9);
    }

    .btn-transparent {
        background-color: rgba(255, 255, 255, 0.2);
        color: white;
    }

    .btn-transparent:hover {
        background-color: rgba(255, 255, 255, 0.3);
    }

    /* 平台区域样式 */
    .platform-section {
        background-color: #f9fafb;
        padding: 3rem 0;
    }

    .platform-container {
        max-width: 1440px;
        margin: 0 auto;
        padding: 0 1rem;
    }

    .section-title {
        font-size: 1.5rem;
        font-weight: bold;
        text-align: center;
        margin-bottom: 1rem;
    }

    .section-description {
        color: #4B5563;
        text-align: center;
        margin-bottom: 3rem;
    }

    .platform-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }


    .platform-card {       
        border-radius: 0.5rem;
        padding: 1.5rem;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
        transition: box-shadow 0.2s;
    }

    .platform-card:hover {
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    }

    .platform-icon {
        width: 3.5rem;
        height: 3.5rem;
        background-color: rgba(79, 122, 255, 0.1);
        border-radius: 0.5rem;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1rem;
    }

    .platform-icon img {
        width: 1.75rem;
        height: 1.75rem;
    }

    .platform-title {
        font-size: 1.25rem;
        font-weight: 500;
        margin-bottom: 0.5rem;
    }

    .platform-description {
        color: #4B5563;
        margin-bottom: 1rem;
    }

    /* 功能区域样式 */
    .feature-section {
        padding: 3rem 0;
    }

    .feature-container {
        max-width: 1440px;
        margin: 0 auto;
        padding: 0 1rem;
    }

    .feature-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .feature-card {
        text-align: center;
    }

    .feature-icon {
        width: 4rem;
        height: 4rem;
        background-color: #E8EDFF;
        border-radius: 9999px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 1rem;
    }

    .feature-icon img {
        width: 1.75rem;
        height: 1.75rem;
    }

    .feature-title {
        font-size: 1rem;
        font-weight: 500;
        margin-bottom: 0.5rem;
    }

    .feature-description {
        color: #4B5563;
    }

   

    /* 媒体查询 - 平板和桌面 */
    @media (min-width: 768px) {


        /* 导航栏 */
        .header-container {
            padding: 0 2rem;
        }

        .logo-text {
            font-size: 1.5rem;
        }

        .site-title {
            font-size: 1.125rem;
        }

        .header-nav {
            display: flex;
            position: static;
            background-color: transparent;
            flex-direction: row;
            padding: 0;
            box-shadow: none;
        }

        .nav-link {
            padding: 0;
        }

        .menu-toggle {
            display: none;
        }

        /* 英雄区域 */
        .hero-section {
            height: 500px;
        }

        .hero-content {
            padding: 0 2rem;
        }

        .hero-text {
            width: 50%;
            text-align: left;
        }

        .hero-title {
            font-size: 3.75rem;
            margin-bottom: 2.5rem;
        }

        .hero-subtitle {
            font-size: 2.25rem;
            margin-bottom: 3rem;
        }

        .hero-description {
            font-size: 1.25rem;
            margin-bottom: 3rem;
        }

        .hero-buttons {
            flex-direction: row;
            align-items: center;
            gap: 1rem;
        }

        .btn {
            width: auto;
        }

        /* 平台区域 */
        .platform-section {
            padding: 5rem 0;
        }

        .platform-container {
            padding: 0 2rem;
        }

        .section-title {
            font-size: 1.875rem;
            margin-bottom: 1rem;
        }

        .section-description {
            margin-bottom: 4rem;
        }

        .platform-grid {
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .platform-card {
            padding: 2rem;
        }

        .platform-icon {
            width: 4rem;
            height: 4rem;
            margin-bottom: 1.5rem;
        }

        .platform-icon img {
            width: 2rem;
            height: 2rem;
        }

        .platform-description {
            margin-bottom: 1.5rem;
        }

        /* 功能区域 */
        .feature-section {
            padding: 5rem 0;
        }

        .feature-container {
            padding: 0 2rem;
        }

        .feature-grid {
            display: flex;
            align-items: center;
            gap:5rem;
            justify-content: center;
        }

        .feature-icon {
            width: 4rem;
            height: 4rem;
            margin-bottom: 1.5rem;
        }

        .feature-icon img {
            width: 1.5rem!important;
            height: 1.5rem!important;
        }

        /* 页脚 */
        .footer {
            padding: 4rem 0;
        }

        .footer-container {
            padding: 0 2rem;
        }

        .footer-grid {
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            margin-bottom: 3rem;
        }

        .footer-logo {
            margin-bottom: 1.5rem;
        }

        .footer-logo-text {
            font-size: 1.5rem;
        }

        .footer-site-title {
            font-size: 1.125rem;
        }

        .footer-title {
            margin-bottom: 1rem;
        }

        .footer-copyright {
            padding-top: 2rem;
        }
    }

    /* 媒体查询 - 中大型桌面 */
    @media (min-width: 1024px) {

        .header-container,
        .hero-content,
        .platform-container,
        .feature-container,
        .footer-container {
            padding: 0 3rem;
        }
    }

    /* 媒体查询 - 大型桌面 */
    @media (min-width: 1280px) {

        .header-container,
        .hero-content,
        .platform-container,
        .feature-container,
        .footer-container {
            padding: 0 4rem;
        }
    }

    @media (min-width:768px){
        .pics{
            display: flex;
            align-items: center;
            gap:20px;
            margin-bottom:50px;
        }
        .pics .item{
            flex:1;
            box-shadow: 0 0 3px 2px #00000033;
            height:400px;
            position: relative;
            border-radius:20px;
            overflow: hidden;
        }
        .pics img{
            width: 100%;
           position: absolute;
           z-index: 0;
           bottom: 0;
            object-fit:cover;
            transition: 500ms;
        }
        .pics img:hover{
            transform: scale(1.1);
        }
        .pics .item .t{
            user-select: none;
            position: absolute;
            bottom:0;
            left:0;
            padding:16px 24px;
            background-color: #00000099;
            color:#fff;
            font-size: 16px;
            line-height: 1;
            width: 100%;
        }
        .pics .item2 img{
            cursor: pointer;
        }
        .pics .item.item2{
            height:21vw;
            max-height:315px;
        }
        .pics .item.item2 img{
            bottom:auto;
            top:0;  

        }
        .pics .item.item2 .t{
            background-color: #fff;
            line-height: 1.5;   
        }
        .pics .t .t1{
            font-size: 20px;
            color:#000;
            margin-bottom:0.5rem;
        }
        .pics .t .t2{
            color:#4B5563;
            font-size: 1rem;
            margin-bottom:1rem;
        }
        .pics .pic-btn{
            text-decoration: none;
            cursor: pointer;
            color:#4F7AFF;
        }
        #mobile_footer{
            display: none;
        }
    }
    @media (max-width:767px) {
        .platform-section{
            padding:3rem 0 0;
        }
        #pc_footer{
            display: none;
        }
        .weixindakai {
            margin-top: 10px;
        }
        .pics{
            margin-bottom:50px;
        }
        .pics .item{
            margin-bottom:20px;
            box-shadow: 0 0 3px 2px #00000033;
            position: relative;
            border-radius:20px;
            overflow: hidden;
        }
        .pics img{
            width: 100%;
            object-fit:cover;
            transition: 500ms;
        }
        .pics img:hover{
            transform: scale(1.1);
        }
        .pics .item .t{
            user-select: none;
            padding:16px 24px;
            background-color: #00000099;
            color:#fff;
            font-size: 16px;
            line-height: 1;
            width: 100%;
        }
        .feature-grid{
            display: flex!important;
            align-items: center;
            justify-content: center;

        }
        .pics .item2 img{
            cursor: pointer;
        }
        .pics .item.item2{
           
        }
        .pics .item.item2 img{
            bottom:auto;
            top:0;  

        }
        .pics .item.item2 .t{
            background-color: #fff;
            line-height: 1.5;   
        }
        .pics .t .t1{
            font-size: 20px;
            color:#000;
            margin-bottom:0.5rem;
        }
        .pics .t .t2{
            color:#4B5563;
            font-size: 1rem;
            margin-bottom:1rem;
        }
        .pics .pic-btn{
            text-decoration: none;
            cursor: pointer;
            color:#4F7AFF;
        }
    }

    @media screen and (max-width:768px) {
        .platform-description{
            text-align: center;
        }
        .platform-card{
            display: flex;
            align-items: center;
            flex-direction: column;
            background-color: white;
        }
        .mobile-top10px{
            margin-top:10px;
        }
        
    }