.qt-color-guide,
  .qt-color-guide * {
    box-sizing: border-box;
  }

  .qt-color-guide {
    width: 100%;
    max-width: 1050px;
    margin: 0 auto;
    padding: 42px 40px 50px;
    background: #ffffff;
    color: #2c3e4f;
    font-family: Arial, Helvetica, sans-serif;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  }

  .qt-color-guide p {
    margin: 0 0 19px;
    color: #2c3e4f;
    font-size: 16px;
    line-height: 1.78;
  }

  .qt-color-guide ul {
    margin: 10px 0 22px;
    padding-left: 22px;
  }

  .qt-color-guide li {
    margin-bottom: 9px;
    color: #2c3e4f;
    font-size: 16px;
    line-height: 1.68;
  }

  .qt-color-guide strong {
    color: #111827;
  }

  .qt-section {
    margin-top: 42px;
  }

  .qt-section-title {
    margin: 0 0 21px;
    padding-left: 14px;
    color: #0f172a;
    font-size: 22px;
    font-weight: 700;
    line-height: 1.4;
    border-left: 4px solid #007bff;
  }

  /*
   * 第一张图片：左侧显示，文字自然环绕
   */
  .qt-image-wrap {
    width: 100%;
  }

  .qt-image-wrap::after {
    display: table;
    clear: both;
    content: "";
  }

  .qt-image-left {
    display: block;
    float: left;
    width: 46%;
    height: auto;
    margin: 5px 28px 14px 0;
    border: 1px solid #dbe7f3;
    border-radius: 15px;
    box-shadow: 0 7px 20px rgba(15, 23, 42, 0.08);
  }

  .qt-highlight {
    clear: both;
    margin: 26px 0;
    padding: 21px 24px;
    background: #f0f6ff;
    border-left: 4px solid #007bff;
    border-radius: 0 12px 12px 0;
  }

  .qt-highlight p {
    margin: 0;
    color: #172554;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.72;
  }

  /*
   * 第2、3、4张图片：三个统一卡片
   */
  .qt-layout-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin: 27px 0 30px;
  }

  .qt-layout-card {
    position: relative;
    overflow: hidden;
    padding: 0 0 23px;
    background: #ffffff;
    border: 1px solid #dbe7f3;
    border-radius: 16px;
    box-shadow: 0 7px 20px rgba(15, 23, 42, 0.05);
  }

  .qt-layout-card::before {
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: #007bff;
    content: "";
  }

  .qt-card-image {
    position: relative;
    overflow: hidden;
    width: 100%;
    aspect-ratio: 4 / 3;
    margin-bottom: 20px;
    background: #f1f5f9;
  }

  .qt-card-image img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .qt-layout-card h3 {
    margin: 0 21px 10px;
    color: #111827;
    font-size: 18px;
    line-height: 1.4;
  }

  .qt-layout-card p {
    margin: 0 21px;
    color: #475569;
    font-size: 14.5px;
    line-height: 1.68;
  }

  /*
   * 第5、6、7、8张图片：一排四张
   */
  .qt-logo-gallery {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin: 25px 0 27px;
  }

  .qt-logo-gallery-item {
    overflow: hidden;
    background: #f8fafc;
    border: 1px solid #dbe7f3;
    border-radius: 13px;
    box-shadow: 0 6px 17px rgba(15, 23, 42, 0.06);
  }

  .qt-logo-gallery-item img {
    display: block;
    width: 100%;
    height: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    transition: transform 0.25s ease;
  }

  .qt-logo-gallery-item:hover img {
    transform: scale(1.025);
  }

  .qt-divider {
    width: 100%;
    height: 1px;
    margin: 35px 0;
    background: linear-gradient(
      to right,
      transparent,
      #cbd5e1 12%,
      #cbd5e1 88%,
      transparent
    );
  }

  .qt-mockup-block {
    margin: 27px 0 29px;
    padding: 28px;
    background: #f8fafc;
    border: 1px solid #dbe7f3;
    border-radius: 17px;
  }

  .qt-mockup-block h3 {
    margin: 0 0 17px;
    color: #111827;
    font-size: 18px;
    line-height: 1.4;
  }

  .qt-mockup-block ul {
    margin-bottom: 0;
  }

  .qt-mockup-block li:last-child {
    margin-bottom: 0;
  }

  .qt-information-list {
    margin: 26px 0 29px;
    padding: 27px 28px;
    background: #f8fafc;
    border: 1px solid #dce7f3;
    border-radius: 17px;
  }

  .qt-information-list h3 {
    margin: 0 0 17px;
    color: #111827;
    font-size: 18px;
    line-height: 1.4;
  }

  .qt-information-list ul {
    margin-bottom: 0;
  }

  .qt-information-list li:last-child {
    margin-bottom: 0;
  }

  .qt-note {
    margin: 24px 0;
    padding: 20px 23px;
    background: #f0f6ff;
    border-left: 4px solid #007bff;
    border-radius: 0 12px 12px 0;
  }

  .qt-note p {
    margin: 0;
    color: #243b64;
    font-size: 15.5px;
    line-height: 1.72;
  }

  .qt-final-message {
    margin: 27px 0 0;
    padding: 22px 25px;
    background: #f0f6ff;
    border-left: 4px solid #007bff;
    border-radius: 0 12px 12px 0;
  }

  .qt-final-message p {
    margin: 0;
    color: #172554;
    font-size: 16.5px;
    font-weight: 700;
    line-height: 1.72;
  }

  .qt-cta {
    margin-top: 44px;
    padding: 32px 30px;
    background: #f8fafc;
    border: 1px solid #dce7f3;
    border-radius: 18px;
    text-align: center;
  }

  .qt-cta h2 {
    margin: 0 0 13px;
    color: #0f172a;
    font-size: 24px;
    line-height: 1.4;
  }

  .qt-cta p {
    max-width: 740px;
    margin: 0 auto 19px;
  }

  .qt-button {
    display: inline-block;
    margin-top: 4px;
    padding: 13px 29px;
    background: #007bff;
    color: #ffffff !important;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none !important;
    border-radius: 40px;
    transition: background 0.2s ease;
  }

  .qt-button:hover {
    background: #0069d9;
  }

  @media (max-width: 900px) {
    .qt-logo-gallery {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }
  }

  @media (max-width: 760px) {
    .qt-color-guide {
      padding: 30px 20px 38px;
      border-radius: 18px;
    }

    .qt-color-guide p,
    .qt-color-guide li {
      font-size: 15.5px;
    }

    .qt-section {
      margin-top: 35px;
    }

    .qt-section-title {
      font-size: 20px;
    }

    .qt-image-left {
      float: none;
      width: 100%;
      margin: 0 0 21px;
    }

    .qt-layout-grid {
      grid-template-columns: 1fr;
    }

    .qt-layout-card,
    .qt-mockup-block,
    .qt-information-list,
    .qt-cta {
      padding-left: 21px;
      padding-right: 21px;
    }

    .qt-layout-card {
      padding-top: 0;
    }

    .qt-card-image {
      width: calc(100% + 42px);
      margin-left: -21px;
    }

    .qt-layout-card h3,
    .qt-layout-card p {
      margin-left: 0;
      margin-right: 0;
    }

    .qt-cta h2 {
      font-size: 21px;
    }
  }

  @media (max-width: 480px) {
    .qt-logo-gallery {
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
    }
  }