body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans CJK JP", sans-serif;
    }
    .font-mono-code {
      font-family: 'JetBrains Mono', monospace;
    }
    .digit-active {
      background-color: #38bdf8;
      color: #0f172a;
      font-weight: 700;
    }
    ::-webkit-scrollbar {
      width: 5px;
      height: 5px;
    }
    ::-webkit-scrollbar-track {
      background: transparent;
    }
    ::-webkit-scrollbar-thumb {
      background: rgba(100, 116, 139, 0.4);
      border-radius: 9999px;
    }