* { margin: 0; padding: 0; box-sizing: border-box; }
    html, body {
      font-family: "pingfang SC", "helvetica neue", arial, "hiragino sans gb", "microsoft yahei ui", "microsoft yahei", simsun, sans-serif !important;
      background: #fff;
      color: #333;
    }
    a { text-decoration: none; cursor: pointer; }
    a:hover { text-decoration: none; }
    ul, ol, li { list-style: none; padding: 0; margin: 0; }

    .ydn-container {
      max-width: 1350px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .ydn-section {
      padding: 90px 0;
    }
    @media (max-width: 768px) {
      .ydn-section { padding: 50px 0; }
    }

    .ydn-title {
      font-size: 30px;
      color: #000;
      text-align: center;
      font-weight: bold;
    }
    @media (max-width: 576px) {
      .ydn-title { font-size: 24px; }
    }

    .ydn-small-text { font-size: 14px; color: #666; }
    .ydn-card, .ydn-btn, .ydn-plan-card, .ydn-advantage-card, .ydn-faq-item {
      border-radius: 10px !important;
    }
    .ydn-btn-primary, .ydn-pz-btn, .ydn-ljzc {
      border-radius: 10px;
      transition: all 0.25s ease;
    }
    .ydn-btn-primary:hover, .ydn-pz-btn:hover, .ydn-ljzc:hover {
      filter: brightness(1.1);
      box-shadow: 0 6px 18px rgba(13, 204, 255, 0.35);
      transform: translateY(-2px);
    }
    .ydn-plan-card:hover, .ydn-advantage-card:hover {
      box-shadow: 0 8px 28px rgba(0,0,0,0.07);
      transition: all 0.25s ease;
    }

    /* banner */
    .ydn-banner {
      width: 100%;
      background: url("/css/2022/images/ydn-banner.jpg") no-repeat top center;
      background-size: cover;
      height: 500px;
      margin-top: 60px;
      position: relative;
    }
    @media (max-width: 768px) {
      .ydn-banner { height: 380px; background-position: center; }
    }
    .ydn-banTxt { padding-top: 122px; box-sizing: border-box; }
    @media (max-width: 768px) { .ydn-banTxt { padding-top: 70px; } }
    .ydn-banTxt h1 {
      font-size: 36px;
      color: #fff;
      font-weight: bold;
    }
    @media (max-width: 576px) { .ydn-banTxt h1 { font-size: 26px; } }
    .ydn-banTxt p {
      font-size: 14px;
      color: #fff;
      max-width: 600px;
      line-height: 24px;
      text-align: justify;
      margin: 40px 0;
    }
    @media (max-width: 768px) {
      .ydn-banTxt p { max-width: 100%; margin: 20px 0; font-size: 13px; }
    }
    .ydn-banBtn a {
      display: inline-block;
      width: 110px;
      height: 35px;
      font-size: 14px;
      text-align: center;
      line-height: 35px;
      color: #fff;
      border: 1px solid #fff;
      margin-right: 35px;
      box-sizing: border-box;
      border-radius: 10px;
      transition: 0.25s;
    }
    .ydn-banBtn a:hover {
      background: linear-gradient(to right, #0dccff, #4760ff);
      border: none;
    }
    .ydn-banBtn-zx {
      font-size: 14px;
      color: #fff;
      margin-top: 17px;
      display: inline-block;
    }

    /* 云电脑有什么用 四列 (grid) */
    .ydn-c1Con {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-top: 50px;
    }
    @media (max-width: 992px) {
      .ydn-c1Con { grid-template-columns: repeat(2, 1fr); gap: 25px; }
    }
    @media (max-width: 576px) {
      .ydn-c1Con { grid-template-columns: 1fr; gap: 30px; }
    }
    .ydn-c1Con li {
      text-align: center;
      padding: 20px 12px;
      border-radius: 10px;
      transition: 0.2s;
      background: transparent;
    }
    .ydn-c1Con li span {
      display: block;
      width: 58px;
      height: 58px;
      background: #0b9aff;
      border-radius: 50%;
      margin: 0 auto 15px;
    }
    .ydn-c1Con li:nth-child(1) span { background: #0b9aff url("/css/2022/images/ysj-icon4.png") no-repeat center center; background-size: 30px; }
    .ydn-c1Con li:nth-child(2) span { background: #0b9aff url("/css/2022/images/ysj-icon2.png") no-repeat center center; background-size: 30px; }
    .ydn-c1Con li:nth-child(3) span { background: #0b9aff url("/css/2022/images/ysj-icon3.png") no-repeat center center; background-size: 30px; }
    .ydn-c1Con li:nth-child(4) span { background: #0b9aff url("/css/2022/images/ysj-icon1.png") no-repeat center center; background-size: 30px; }
    .ydn-c1Con li h3 {
      font-size: 18px;
      color: #333;
      font-weight: bold;
      margin: 12px 0 10px;
    }
    .ydn-c1Con li p {
      font-size: 14px;
      color: #777;
      line-height: 24px;
    }

    /* 收费标准 grid */
    .ydn-c2Con {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 20px;
    }
    @media (max-width: 992px) {
      .ydn-c2Con { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 576px) {
      .ydn-c2Con { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
    }
    .ydn-plan-card {
      border: 1px solid #ebeef5;
      padding: 0 20px 25px;
      background: #fff;
      border-radius: 10px;
      transition: 0.25s;
      display: flex;
      flex-direction: column;
    }
    .ydn-plan-card .ydn-pz-tit {
      height: 60px;
      line-height: 60px;
      font-size: 18px;
      color: #333;
      text-align: center;
      border-bottom: 1px solid #ebeef5;
      font-weight: bold;
    }
    .ydn-pzxq {
      padding: 20px 0 10px;
      text-align: center;
      flex: 1;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
    }
    .ydn-pzxq-list {
      width: 50%;
      margin-bottom: 18px;
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 10px;
    }
    .ydn-pzxq-list p:first-child {
      font-size: 14px;
      color: #888;
      margin: 0;
    }
    .ydn-pzxq-list p:last-child {
      font-size: 16px;
      color: #333;
      margin: 0;
    }
    .ydn-pzPric {
      font-size: 14px;
      color: #888;
      margin-top: 5px;
      cursor: pointer;
      width: 100%;
    }
    .ydn-pzPric span {
      font-size: 24px;
      color: #e8511b;
    }
    .ydn-pz-btn {
      display: block;
      width: 100%;
      max-width: 190px;
      margin: 20px auto 0;
      height: 41px;
      background: linear-gradient(to right, #0dccff, #4760ff);
      font-size: 14px;
      text-align: center;
      line-height: 41px;
      color: #fff;
      border-radius: 10px;
    }
    .ydn-sftit {
      margin-top: 40px;
      margin-bottom: 10px;
    }
    .ydn-sftit h3 {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 6px 10px;
    }
    .ydn-sftit h3 span:first-child {
      display: inline-block;
      width: 4px;
      height: 16px;
      background: #0080ff;
    }
    .ydn-sftit h3 span:nth-child(2) {
      font-size: 16px;
      color: #333;
      font-weight: bold;
    }
    .ydn-sftit h3 span:nth-child(3) {
      font-size: 14px;
      color: #888;
    }

    /* 使用场景 手风琴 */
    .ydn-c3Con { margin-top: 50px; }
    .ydn-c3Con > li { width: 100%;}
    .ydn-cjTop {
      height: 100px;
      background: #f9f9f9;
      cursor: pointer;
      padding: 0 25px;
      border: 1px solid #ebeef5;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: 0.2s;
    }
    .ydn-cjTop.ydn-cjTopact {
      background: #0b9aff;
      border-color: #0b9aff;
    }
    .ydn-cjTopimg {
      width: 30px;
      height: 30px;
      background: url("/css/2022/images/ydn-icon.png") no-repeat;
      flex-shrink: 0;
      margin-right: 20px;
    }
    /* 两个场景图标定位 */
    .ydn-c3Con > li:nth-child(1) .ydn-cjTopimg { background-position: 0 0; }
    .ydn-c3Con > li:nth-child(1) .ydn-cjTop.ydn-cjTopact .ydn-cjTopimg { background-position: 0 -53px; }
    .ydn-c3Con > li:nth-child(2) .ydn-cjTopimg { background-position: -64px 0px; }
    .ydn-c3Con > li:nth-child(2) .ydn-cjTop.ydn-cjTopact .ydn-cjTopimg { background-position: -64px -53px; }

    .ydn-cjTit { flex: 1; min-width: 0; }
    .ydn-cjTit h3 { font-size: 18px; color: #333; font-weight: bold; }
    .ydn-cjTit p {
      font-size: 12px;
      color: #888;
      margin-top: 4px;
      overflow: hidden;
      text-overflow: ellipsis;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
    }
    .ydn-cjTop.ydn-cjTopact .ydn-cjTit h3,
    .ydn-cjTop.ydn-cjTopact .ydn-cjTit p { color: #fff; }

    .ydn-jt {
      width: 16px;
      height: 8px;
      background: url("/css/2022/images/ysj-jt.png") no-repeat center;
      background-size: contain;
      flex-shrink: 0;
      margin-left: 15px;
      transition: 0.2s;
    }
    .ydn-jt.ydn-jtact {
      background: url("/css/2022/images/ysj-jt-1.png") no-repeat center;
      background-size: contain;
    }
    .ydn-cjCon {
      background: #fff;
      padding: 25px 30px 30px;
      border: 1px solid #ebeef5;
      border-top: none;
      display: none;
    }
    .ydn-cjCon .ydn-cjConList h3 { font-size: 14px; color: #333; font-weight: bold; }
    .ydn-cjCon .ydn-cjConList p { font-size: 14px; color: #888; margin-top: 12px; }
    .ydn-cjCon .ydn-cjConList p a {
      display: inline-block;
      height: 34px;
      border: 1px solid #ebeef5;
      line-height: 34px;
      font-size: 14px;
      color: #666;
      padding: 0 18px;
      margin-right: 12px;
      border-radius: 10px;
      margin-bottom: 8px;
    }
    .ydn-cjCon .ydn-cjConList p a img { margin-right: 6px; }

    /* 产品优势 grid */
    .ydn-c4Con {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    @media (max-width: 768px) {
      .ydn-c4Con { grid-template-columns: 1fr; }
    }
    .ydn-advantage-card {
      border: 1px solid #ebeef5;
      padding: 28px 22px;
      border-radius: 10px;
      display: flex;
      align-items: flex-start;
      gap: 18px;
      transition: 0.25s;
      background: #fff;
    }
    .ydn-advantage-card img { flex-shrink: 0; width: 44px; height: 44px; }
    .ydn-advantage-card .ydn-ysCon h4 { font-size: 18px; color: #333; font-weight: bold; }
    .ydn-advantage-card .ydn-ysCon p { font-size: 14px; color: #888; line-height: 24px; margin-top: 8px; }

    /* FAQ grid */
    .ydn-c5Con {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px 30px;
      margin-top: 35px;
    }
    @media (max-width: 992px) {
      .ydn-c5Con { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 576px) {
      .ydn-c5Con { grid-template-columns: 1fr; }
    }
    .ydn-faq-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 12px;
      border-radius: 10px;
      transition: 0.2s;
      background: transparent;
      border: 1px solid transparent;
    }
    .ydn-faq-item span {
      width: 20px;
      height: 20px;
      background: #0b9aff;
      color: #fff;
      font-size: 14px;
      text-align: center;
      line-height: 20px;
      border-radius: 50%;
      flex-shrink: 0;
    }
    .ydn-faq-item a {
      font-size: 14px;
      color: #666;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .ydn-faq-item:hover {
      border-color: #0b9aff;
      background: transparent;
    }

    /* 底部注册模块 */
    .ydn-con6 {
      background: linear-gradient(to right, #3666ff, #4671fa);
      padding: 60px 0;
      text-align: center;
    }
    .ydn-tit1 {
      font-size: 30px;
      color: #fff;
      font-weight: bold;
    }
    @media (max-width: 576px) {
      .ydn-tit1 { font-size: 22px; }
    }
    .ydn-ljzc {
      display: inline-block;
      width: 132px;
      height: 48px;
      background: #fff;
      font-size: 16px;
      text-align: center;
      line-height: 48px;
      color: #0071ef;
      border-radius: 10px;
      margin-top: 30px;
      transition: 0.25s;
    }
    .ydn-ljzc:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    }

    .ydn-con1, .ydn-con3, .ydn-con5 { background: #f9faff; }
    .ydn-con2, .ydn-con4 { background: #fff; }

    @media (max-width: 576px) {
      .ydn-cjTop {
        height: auto;
        padding: 16px 16px;
        flex-wrap: wrap;
      }
      .ydn-cjTit p { display: none; }
      .ydn-cjCon { padding: 18px 16px; }
      .ydn-banBtn a {
        width: 90px;
        margin-right: 12px;
        font-size: 13px;
      }
      .ydn-pzxq-list {
        width: 100%;
        justify-content: space-between;
        padding: 0 10px;
      }
    }