.introduction {
  display: flex;
  flex-wrap: nowrap;

  .introduction-menu {
    user-select: none;
    flex: 0 0 252px;
    background: #edeff3;
    margin-right: 3%;

    .menu-title {
      input[type='checkbox'] {
        display: none;
      }

      label {
        display: block;
        color: #4f4f4f;
        font-size: 16px;
        cursor: pointer;
        height: 50px;
        line-height: 50px;
        border-bottom: 1px solid #ffffff;
        padding-left: 5%;
        box-sizing: border-box;
        margin: 0;
        text-overflow: ellipsis;
        overflow: hidden;
        max-width: 250px;
        white-space: nowrap;

        &::before {
          content: '';
          display: inline-block;
          width: 6px;
          height: 6px;
          border-bottom: 2px solid #4f4f4f;
          transform: translateY(-5px) translateX(5px);
          margin-right: 12px;
          border-right: 2px solid #4f4f4f;
          transform: translateY(-2px) translateX(3px) rotate(-45deg);
          transition: all 0.2s;
        }

        &:hover {
          font-weight: bold;
        }
      }

      input[type='checkbox']:checked ~ label {
        font-weight: bold;

        &::before {
          transform: translateY(-2px) translateX(3px) rotate(45deg);
        }
      }

      ul {
        list-style: none;
        padding: 0;
        margin: 0;
        div {
          height: 0;
          overflow: hidden;
        }

        li {
          height: 0;
          width: 252px;
          padding-left: 30px;
          overflow: hidden;
          font-size: 14px;
          transition: all 0.2s;
          border-bottom: 0px solid transparent;
          cursor: pointer;
          box-sizing: border-box;
          text-overflow: ellipsis;
          white-space: nowrap;
          line-height: 50px;

          &:hover {
            color: #2071f4;

            &::before {
              border-color: #2071f4;
            }
          }

          &.active {
            color: #2071f4;
            background: #fff;
            border-left: 10px solid #2071f4;
            padding-left: 20px;

            &::before {
              border-color: #2071f4;
            }
          }

          &::before {
            content: '';
            width: 6px;
            height: 6px;
            border: 1px solid #4f4f4f;
            border-radius: 50%;
            display: inline-block;
            margin-right: 8px;
            transform: translateY(-1px);
          }
          &.items {
            cursor: default;
            &::before {
              height: 1px;
              transform: translateY(-4px);
            }
          }
        }
        ul > li {
          width: 242px;
        }
        input[type='checkbox']:not(checked) ~ ul > li {
          height: 0;
        }
        input[type='checkbox']:checked ~ ul {
          li {
            height: 50px;
            border-bottom: 1px solid #ffffff;
          }
        }
        label {
          font-size: 14px;
          padding-left: 25px;
        }
      }

      & > input[type='checkbox']:checked ~ ul {
        & > li {
          height: 50px;
          border-bottom: 1px solid #ffffff;
        }
        div {
          height: auto;
        }
      }
    }
  }

  .introduction-content {
    flex: 1;

    .introduction-title {
      font-size: 30px;
      font-weight: bold;
      border-bottom: 2px solid #edeff3;
      padding: 2% 0;
      margin-bottom: 2%;
    }

    div {
      img {
        max-width: 100%;
      }

      .wp-video {
        width: 100% !important;

        video {
          width: 100% !important;
          height: auto !important;
        }
      }
    }
  }
}

.favorite {
  background: #f5f6f9;
  margin-top: 30px;
  padding: 20px;
  box-sizing: border-box;

  .favorite-head {
    font-size: 20px;
    font-weight: bold;
    color: #4f4f4f;
    margin-bottom: 20px;
  }

  ul {
    li {
      color: #4f4f4f;
      font-size: 18px;
      margin-bottom: 15px;

      &::marker {
        color: #2071f4;
      }

      img {
        width: 14px;
        height: 8px;
        margin-left: auto;
      }

      a {
        flex: 1;
        max-width: 50%;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        text-decoration: none;
        color: rgba(79, 79, 79, 1);
      }

      div {
        display: flex;
        align-items: center;

        span {
          flex: 0 0 50px;
          text-align: right;
        }
      }
    }
  }
}
.introduction{
  ul, ol, li {
    list-style-type: unset;
    margin: revert;
  }
  p,span{
    line-height: 1.5;
  }
  *{
    padding: revert;
  }
  .h1, .h2, .h3, .h4, .h5, .h6, h1, h2, h3, h4, h5, h6 {
    margin-bottom: .5rem;
    font-weight: 500;
    line-height: 1.2;
  }
  p{
    margin-bottom: 10px;
  }
}