* {

    box-sizing: border-box;

  }



  html {

    scroll-behavior: smooth;

  }



  body {

    margin: 0;

    font-family: Arial, "Microsoft YaHei", sans-serif;

    color: #111;

    background: #fff;

  }



  .case-page {

    display: flex;

    max-width: 1500px;

    margin: 0 auto;

    padding: 48px 40px 80px;

    gap: 56px;

  }



  /* 左侧目录 */

  .case-sidebar {

    width: 260px;

    flex-shrink: 0;

    position: sticky;

    top: 40px;

    align-self: flex-start;

  }



  .sidebar-title {

    font-size: 24px;

    font-weight: 400;

    letter-spacing: 0.5px;

    margin-bottom: 6px;

  }



  .sidebar-subtitle {

    font-size: 14px;

    color: #999;

    margin-bottom: 24px;

  }



  .industry-menu {

    border-top: 1px solid #e5e5e5;

  }



  .industry-menu a {

    display: flex;

    justify-content: space-between;

    align-items: center;

    height: 46px;

    text-decoration: none;

    color: #555;

    font-size: 15px;

    border-bottom: 1px solid #eee;

    transition: all 0.25s ease;

  }



  .industry-menu a::after {

    content: "";

    color: #222;

    font-size: 18px;

    font-weight: 300;

  }



  .industry-menu a:hover {

    color: #000;

    padding-left: 8px;

  }



  /* 右侧内容 */

  .case-content {

    flex: 1;

    min-width: 0;

  }



  .page-heading {

    margin-bottom: 72px;

  }



  .page-heading h1 {

    font-size: 24px;

    font-weight: 400;

    letter-spacing: 0.5px;

    margin: 0 0 6px;

  }



  .page-heading p {

    font-size: 14px;

    color: #999;

    margin: 0;

  }



  .heading-line {

    height: 1px;

    background: #e5e5e5;

    margin-top: 22px;

  }



  /* 行业区块 */

  .case-section {

    margin-bottom: 100px;

    scroll-margin-top: 60px;

  }



  .section-title {

    margin-bottom: 36px;

  }



  .section-title h2 {

    font-size: 22px;

    font-weight: 500;

    margin: 0 0 8px;

  }



  .section-title span {

    display: block;

    font-size: 13px;

    color: #999;

    text-transform: uppercase;

    letter-spacing: 1px;

  }



  /* 单张大图 + 文案布局 */

  .industry-intro {

    display: grid;

    grid-template-columns: 1.15fr 0.85fr;

    gap: 48px;

    align-items: center;

  }



  .industry-image {

    width: 100%;

    aspect-ratio: 64 / 45;

    background: #f3f3f3;

    overflow: hidden;

  }



  .industry-image img {

    width: 100%;

    height: 100%;

    object-fit: cover;

    display: block;

    transition: transform 0.35s ease;

  }



  .industry-intro:hover .industry-image img {

    transform: scale(1.03);

  }



  .industry-text h3 {

    font-size: 24px;

    font-weight: 500;

    margin: 0 0 18px;

    line-height: 1.4;

  }



  .industry-text p {

    font-size: 15px;

    line-height: 1.9;

    color: #555;

    margin: 0 0 16px;

  }



  .industry-text .paragraph-node {

    font-size: 15px;

    line-height: 1.9;

    color: #555;

    margin: 0 0 16px;

  }



  .industry-points {

    margin-top: 26px;

    padding-top: 22px;

    border-top: 1px solid #e5e5e5;

  }



  .industry-points a {

    text-decoration: none;

  }



  .industry-points span {

    display: inline-block;

    margin: 0 10px 10px 0;

    padding: 7px 14px;

    font-size: 13px;

    color: #333;

    background: #f5f5f5;

    border-radius: 20px;

    transition: all 0.25s ease;

  }



  .industry-points span:hover {

    background: #e9e9e9;

    color: #000;

  }



  /* 响应式 */

  @media (max-width: 1200px) {

    .industry-intro {

      grid-template-columns: 1fr;

      gap: 28px;

    }

  }



  @media (max-width: 900px) {

    .case-page {

      flex-direction: column;

      padding: 32px 20px 60px;

    }



    .case-sidebar {

      width: 100%;

      position: static;

    }



    .industry-menu {

      display: grid;

      grid-template-columns: repeat(2, 1fr);

      gap: 0 20px;

    }



    .page-heading {

      margin-bottom: 52px;

    }



    .case-section {

      margin-bottom: 76px;

    }

  }



  @media (max-width: 560px) {

    .industry-menu {

      grid-template-columns: 1fr;

    }



    .industry-text h3 {

      font-size: 21px;

    }



    .industry-text p,

    .industry-text .paragraph-node {

      font-size: 14px;

    }

  }