/* ===== 主容器 ===== */
    .b2b-sub-cat {
      background: #fff;
      border-radius: var(--b2b-radius);
      box-shadow: var(--b2b-shadow);
      padding: 30px;
      margin: 25px auto;
    }
    .sub-cat__header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 25px;
    }
    .sub-cat__title {
      font-size: 20px;
      font-weight: 700;
      color: var(--b2b-blue);
    }
    .sub-cat__count {
      font-size: 13px;
      color: #999;
    }

    /* 二级分组 - 渐变标题块 */
    .sub-cat__lv2 {
      display: flex;
      flex-direction: column;
      gap: 25px;
    }
    .sub-cat__group {
      display: flex;
      gap: 20px;
      align-items: flex-start;
      padding: 20px;
      background: var(--b2b-light);
      border-radius: var(--b2b-radius);
      transition: .2s;
    }
    .sub-cat__group:hover {
      box-shadow: 0 2px 12px rgba(0, 87, 146, .08);
    }
    .sub-cat__lv2-title {
      flex: 0 0 200px;
      font-size: 17px;
      font-weight: 600;
      color: #fff;
      background: linear-gradient(135deg, var(--b2b-blue) 0%, #004a8c 100%);
      padding: 10px 15px;
      border-radius: 8px;
      text-align: center;
      transition: .2s;
	  border-left: 4px solid var(--b2b-orange);
    }
    .sub-cat__lv3 {
      flex: 1;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .sub-cat__lv3 a {
      background: rgba(0, 87, 146, .08);
      color: var(--b2b-blue);
      padding: 6px 14px;
      border-radius: 15px;
      font-size: 13px;
      transition: .2s;
    }
    .sub-cat__lv3 a:hover {
      background: var(--b2b-orange);
      color: #fff;
    }

    /* ===== 右侧栏 20% ===== */
    .b2b-right-bar {
      background: #fff;
      border-radius: var(--b2b-radius);
      box-shadow: var(--b2b-shadow);
      padding: 20px;
      margin: 25px 0;
    }
    .right-bar__sect {
      margin-bottom: 25px;
    }
    .right-bar__sect:last-child {
      margin-bottom: 0;
    }
    .right-bar__tit {
      font-size: 16px;
      font-weight: 600;
      color: var(--b2b-blue);
      margin-bottom: 12px;
      border-left: 4px solid var(--b2b-orange);
      padding-left: 8px;
    }
    .right-bar__list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .right-bar__list li {
      padding: 6px 0;
      border-bottom: 1px solid #f0f0f0;
      font-size: 13px;
    }
    .right-bar__list li:last-child {
      border-bottom: 0;
    }
    .right-bar__list a {
      color: var(--b2b-gray);
      text-decoration: none;
      transition: color .2s;
    }
    .right-bar__list a:hover {
      color: var(--b2b-orange);
    }
    .right-bar__ad {
      width: 100%;
      border-radius: var(--b2b-radius);
      object-fit: cover;
      margin-bottom: 15px;
    }

    /* 移动端堆叠 */
    @media (max-width: 768px) {
      .sub-cat__group {
        flex-direction: column;
        gap: 15px;
      }
      .sub-cat__lv2-title {
        flex: 1 1 auto;
      }
    }