.article-level-tabs {
      display: inline-flex;
      align-self: flex-start;
      max-width: 100%;
      overflow-x: auto;
      border: 1px solid var(--paper-line);
      border-radius: 7px;
      background: var(--paper-deep);
      scrollbar-width: none;
    }

    .article-level-tabs::-webkit-scrollbar {
      display: none;
    }

    .article-level-tab {
      min-width: 58px;
      padding: 8px 15px;
      border: 0;
      border-right: 1px solid var(--paper-line);
      background: transparent;
      color: var(--muted);
      font-family: var(--font-en);
      font-size: 13px;
      font-weight: 700;
      line-height: 1;
      cursor: pointer;
      transition: color .18s ease, background .18s ease;
      white-space: nowrap;
    }

    .article-level-tab:last-child {
      border-right: 0;
    }

    .article-level-tab:hover {
      color: var(--ink);
      background: rgba(255, 255, 255, .55);
    }

    .article-level-tab.active {
      color: #fff;
      background: var(--red);
    }

    .article-level-tab:focus-visible {
      position: relative;
      z-index: 1;
      outline: 2px solid var(--ink);
      outline-offset: -2px;
    }

    .original-source-card {
      display: grid;
      gap: 12px;
      padding: 24px;
      border: 1px solid var(--paper-line);
      border-radius: 8px;
      background: var(--paper-deep);
      font-family: var(--font-cn);
    }

    .original-source-card strong {
      font-size: 18px;
    }

    .original-source-card p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.7;
    }

    .original-source-card a {
      justify-self: start;
      color: var(--red);
      font-size: 15px;
      font-weight: 700;
      text-decoration: none;
      border-bottom: 1px solid currentColor;
    }

    @media (max-width: 640px) {
      .article-level-tabs {
        width: 100%;
      }

      .article-level-tab {
        flex: 1 0 auto;
        min-width: 68px;
        padding: 10px 14px;
      }

      .original-source-card {
        padding: 20px;
      }
    }