:root {
    --primary-color: #8257E6;
    --secondary-color: #6F48C9;
    --background-color: #F8F9FA;
    --text-color: #333;
    --text-secondary: #666666;     /* 次要文字颜色 */
    --text-light: #999999;         /* 浅色文字 */
}

/* 全局样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
    padding-top: 108px; /* 桌面端导航栏高度 */
}
ul{
    padding: 0;
    margin: 0;
}
li{
    list-style: none;
}
a{
    text-decoration: none;
}


/* 通用标题样式 */
.section-title {
    color: #20184E;
    font-size: 2.75rem;
    font-weight: 600;
    margin-bottom: 3rem;
    position: relative;
    text-align: center;
}

/* 通用图标样式 */
.contact-icon {
    width: 32px;
    height: 32px;
}

/* 通用文本样式 */
.contact-text {
    color: #20184E;
    font-size: 1.5rem;
}

.contact-section {
    padding: 125px 0;
    background: white;
    position: relative;
}
.contact-section::before {
    content: '';
    position: absolute;
    top: 310px;
    background: url(../images/bg-img2.png) no-repeat bottom;
    width: 136px;
    height: 531px;
    z-index: 0;
}
.contact-section::after {
    content: '';
    position: absolute;
    bottom: -180px;
    background: url(../images/bg-img3.png) no-repeat bottom right;
    width: 346px;
    height: 531px;
    z-index: 0;
    right: 0px;
    background-size: 80%;
}
.tutorial-content{
    display: flex;
    flex-flow: row;
    justify-content: flex-start;
    align-items: flex-start;
}
.tutorial-title{
    color: #20184E;
    font-size: 26px;
    font-weight: 600;
    text-align: left;
    margin-bottom: 32px;
}
.tutorial-left{
    width: 25%;
    border-right: solid 1px #F7F7FA ;
    padding-right: 36px; 
}
.tutorial-right{
    width: 75%;
    padding-left: 56px;
}
/* 目录样式 */
.tutorial-menu .menu-list {
    list-style: none;
    padding-left: 0;
    text-align: left;
}
.tutorial-menu .menu-item {
    display: block;
    line-height: 36px;
    color: #666;
    text-decoration: none;
    transition: all 0.3s;
    font-size: 16px;
}
.tutorial-menu .menu-item.primary-text{
    color: var(--primary-color);
    font-weight: 600;
    font-size: 18px;  
}
.tutorial-menu .menu-list li:first-child {
    margin-top: 0;
}
.tutorial-menu .menu-item.primary-text.active {
    color: var(--primary-color);
}
.tutorial-menu .menu-item.active {
    color: var(--text-color);
    font-weight: 600;
}
.tutorial-menu .menu-item:hover {
    color: var(--primary-color);
    font-weight: normal;
}
.tutorial-menu .menu-item.primary-text:hover {
    color: var(--primary-color);
    font-weight: 600;
}
.menu-list li{
    margin-top: 16px;
}
.menu-list .sub-menu li {
    margin-top: 0;
}
.menu-name{
    font-size: 18px;
    color: #20184E;
    font-weight: 600;
    line-height: 36px;
}
.sub-menu{
    padding-left: 24px;
}
/* 右侧内容切换 */
.tutorial-right .content-item {
    display: none;
    padding: 0 20px 20px;
    min-height: 400px;
}
.tutorial-right .content-item.active {
    display: block;
}
/* 入门样式 */
.right-text{
    text-align: left;
    font-size: 30px;
    color: #333;
}
.video-title{
    font-size: 36px;
    color: var(--text-color);
    font-weight: 600;
    text-align: left;
    margin: 18px 0 26px;
    font-weight: 600;
}
.video-text{
    font-size: 18px;
    color: var(--text-secondary);
    margin-top: 16px;
    text-align: left;
    padding-right: 80px;
}
.video-box{
    margin-top: 48px;
}
.video-box ul{
    display: flex;
    flex-flow: row wrap;
    justify-content: space-around;
    gap: 32px;
}
.video-item{
    width: 30.33%;
    text-align: center;
}
.video-item img{
    width: 100%;
}
.video-item-img{
    width: 100%;
    height: 150px;
    background: #F7F7FA;
    border-radius: 12px;
    overflow: hidden;
}
.video-item-img img{
    width: 100%;
    height: 100%;
}
.video-item p{
    font-size: 16px;
    color: var(--text-secondary);
    margin-top: 16px;
    margin-bottom: 0;
}
.ask-box{
    width: 100%;
    height: auto;
    background: #F8F8FB;
    margin: 60px 0;
    padding: 44px;
}
.ask-box h2{
    font-size: 36px;
    color: #333;
    text-align: left;
    position: relative;
}
.ask-box h2::after{
    content: '';
    position: absolute;
    width: 72px;
    height: 2px;
    background: #8828FF;
    left: 0;
    bottom: -28px;
}
.ask-content{
    margin-top: 58px;
    text-align: left;
}
.ask-item{
    background: #fff;
    padding: 22px 40px;
    border-radius: 10px;
    margin-bottom: 14px;
}
.ask-item:last-child{
    margin-bottom: 0;
}
.ask-item-name{
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 24px;
    transition: color 0.3s ease;
    display: flex;
    flex-flow: row;
    align-items: flex-start;
}
.ask-item-name.active {
    color: #260055 ; /* 激活状态文字颜色 */
}
.ask-item-name img{
    width: 24px;
    height: 24px;
    margin-right: 8px;
    transition: transform 0.3s ease;
}
.ask-item-name img.active {
    transform: rotate(180deg);
}
.ask-item-text{
    display: none;
    font-size: 14px;
    color: #666;
    margin-bottom: 12px;
    font-size: 14px;
    color: #260055;
    margin: 16px 0 12px;
    line-height: 24px;
    padding-left: 32px;
}
.ask-item-text.active {
    display: block;
}
.backBtn{
    background: var(--primary-color);
    border-radius: 60px;
    padding: 12px 40px;
    color: #fff;
    font-size: 1rem;
    border: none;
    box-shadow: none;
    text-align: center;
}
/* 第二部分 */
.news-title{
    text-align: left;
    margin-bottom: 66px;
}
.news-title h3{
    font-size: 36px;
    color: #20184E;
    margin-bottom: 40px;
}
.news-title span{
    font-size: 16px;
    color: var(--text-secondary);
}
.news-content-container{
    width: 100%;
    height: auto;
}
.news-content-container li{
    width: 100%;
    height: auto;
    margin-bottom: 30px;
}
.news-content-container li:last-child{
    margin-bottom: 0;
}
.news-content-container li img{
    width: 100%;
    height: 100%;
}
/* 第三部分 */
.news-content-container{
    text-align: left;
}
.news-content-container p{
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 32px;
    text-align: justify;
    margin-bottom: 12px;
}
.tupian{
    width: 100%;
    height: 400px;
}
.tupian img{
    width: 100%;
    height: 100%;
}
/* 第三部分 */
.news-content-container h3{
    font-size: 28px;
    line-height: 32px;
    margin-bottom: 30px;
    color: var(--text-color);
}
.margin-btm{
    margin: 48px 0;
}
/* 移动端适配 */
@media (max-width: 991px) {
    body {
        padding-top: 48px; /* 移动端导航栏高度 */
    }

    /* 联系部分适配 */
    .contact-section {
        padding: 40px 0 48px;
    }
    .contact-section .container:first-child{
        margin-bottom: 3rem;
    }
    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }
    .backBtn{
        padding: 12px 32px;
        font-size: 0.85rem;
    }
    .tutorial-left {
        width: 25%;
        padding-right: 36px;
        padding-bottom: 12px;
    }
    .menu-list li {
        margin-top: 8px;
    }
    .menu-name {
        font-size: 16px;
        line-height: 36px;
    }
    .tutorial-menu .menu-item {
        line-height: 30px;
        font-size: 14px;
    }
    .sub-menu {
        padding-left: 16px;
    }
    .tutorial-title {
        font-size: 20px;
        margin-bottom: 20px;
    }
    .tutorial-menu .menu-item.primary-text {
        font-size: 16px;
    }
    .tutorial-right {
        width: 75%;
        padding-left: 44px;
        padding-top: 16px;
    }
    .tutorial-right .content-item {
        padding: 0 0 20px;
    }
    .right-text {
        font-size: 22px;
    }
    .video-title {
        font-size: 26px;
        margin: 16px 0 20px;
    }
    .video-text {
        font-size: 16px;
        padding-right: 56px;
        text-align: justify;
    }
    .video-box {
        margin-top: 32px;
    }
    .video-item {
        width: 45%;
    }
    .video-item-img {
        height: 120px;
    }
    .video-item p {
        font-size: 14px;
        margin-top: 14px;
    }
    .video-box ul {
        gap: 24px;
    }
    .ask-box {
        margin: 32px 0;
        padding: 20px;
    }
    .ask-box h2 {
        font-size: 28px;
    }
    .ask-box h2::after {
        width: 56px;
        bottom: -20px;
    }
    .ask-content {
        margin-top: 48px;
    }
    .ask-item {
        padding: 16px 16px;
    }
    .ask-item-name img {
        width: 16px;
        height: 16px;
        margin-right: 6px;
        margin-top: 4px;
    }
    .ask-item-name {
        font-size: 16px;
        line-height: 24px;
    }
    .ask-item-text {
        font-size: 14px;
        margin: 12px 0 12px;
        line-height: 22px;
        padding-left: 22px;
    }
    .news-title h3 {
        font-size: 26px;
        margin-bottom: 16px;
    }
    .news-title span{
        font-size: 14px;
    }
    .news-title {
        margin-bottom: 36px;
    }
    .news-content-container p {
        font-size: 16px;
        line-height: 30px;
        margin-bottom: 6px;
    }
    .tupian {
        width: 100%;
        height: 320px;
    }
    .margin-btm {
        margin: 36px 0;
    }
    .news-content-container h3 {
        font-size: 22px;
        line-height: 28px;
        margin-bottom: 20px;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
    text-align: center;
}

@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: 0 30px;
    }
    .contact-section::before,.contact-section::after {
        content: none;
    }
    .backBtn{
        padding: 12px 32px;
        font-size: 1rem;
    }
    .tutorial-right {
        width: 75%;
        padding-left: 40px;
    }
    .video-box ul {
        gap: 28px;
    }
    
}

@media (max-width: 767px) {
    .container {
        padding: 0 30px;
    }
    .contact-section {
        padding: 40px 0 4px;
    }
    .contact-content {
        position: relative;
        padding: 3rem 1rem;
    }  
    .tutorial-content {
        flex-flow: column;
    }
    .tutorial-left {
        width: 100%;
        border-bottom: solid 1px #F7F7FA;
        border-right: none;
        padding-right: 36px;
        padding-bottom: 12px;
    }
    .menu-name {
        font-size: 14px;
        line-height: 36px;
        margin-top: 0px;
    }
    .tutorial-menu .menu-item {
        line-height: 28px;
        font-size: 12px;
    }
    .tutorial-title {
        font-size: 18px;
        margin-bottom: 18px;
    }
    .tutorial-menu .menu-item.primary-text {
        font-size: 14px;
    }
    .tutorial-right {
        width: 100%;
        padding-left: 0;
        padding-top: 16px;
    }
    .tutorial-right .content-item {
        padding: 0 0 20px;
    }
    .right-text {
        font-size: 20px;
    }
    .video-title {
        font-size: 24px;
        margin: 12px 0 16px;
    }
    .video-text {
        font-size: 14px;
        padding-right: 0;
        text-align: justify;
    }
    .video-item {
        width: 45%;
    }
    .video-item-img {
        height: 120px;
    }
    .video-item p {
        font-size: 14px;
        margin-top: 12px;
    }
    .video-box ul {
        gap: 24px;
    }
    .ask-box {
        margin: 32px 0;
        padding: 24px;
    }
    .ask-box h2 {
        font-size: 20px;
    }
    .ask-box h2::after {
        width: 56px;
        bottom: -16px;
    }
    .ask-content {
        margin-top: 36px;
    }
    .ask-item {
        padding: 16px 16px;
    }
    .ask-item-name img {
        width: 16px;
        height: 16px;
        margin-right: 4px;
        margin-top: 3px;
    }
    .ask-item-name {
        font-size: 14px;
        line-height: 22px;
    }
    .ask-item-text {
        font-size: 12px;
        margin: 12px 0 12px;
        line-height: 20px;
        padding-left: 20px;
    }
    .backBtn{
        padding: 4px 24px;
        font-size: 0.85rem;
    }
    .news-title h3 {
        font-size: 24px;
        margin-bottom: 16px;
    }
    .news-title span{
        font-size: 12px;
    }
    .news-title {
        margin-bottom: 36px;
    }
    .news-content-container p {
        font-size: 14px;
        line-height: 26px;
        margin-bottom: 4px;
    }
    .tupian {
        width: 100%;
        height: 260px;
    }
    .margin-btm {
        margin: 24px 0;
    }
    .news-content-container h3 {
        font-size: 20px;
        line-height: 24px;
        margin-bottom: 16px;
    }
}