* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background-color: #0f172a;
      color: #f8fafc;
      width: 100vw;
      height: 100vh;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 2rem 3rem;
    }

    header {
      border-bottom: 2px solid #1e293b;
      padding-bottom: 1rem;
    }

    header h1 {
      font-size: 2.2rem;
      color: #38bdf8;
      letter-spacing: -0.5px;
    }

    header p {
      color: #94a3b8;
      font-size: 1.3rem;
      margin-top: 0.25rem;
    }

    .container {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 1.25rem;
      align-items: stretch;
      flex-grow: 1;
      margin: 1.5rem 0;
    }

    .card {
      background: #1e293b;
      border: 1px solid #334155;
      border-radius: 12px;
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.2s, border-color 0.2s;
    }

    .card:hover {
      transform: translateY(-4px) scale(1.08) !important;
      /* 強制拡大 */
      border-color: #38bdf8 !important;
      transition: transform 0.3s ease, border-color 0.3s ease !important;
    }


    .step-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: #38bdf8;
      opacity: 0.8;
      margin-bottom: 0.5rem;
    }

    .card h2 {
      font-size: 1.8rem;
      color: #f1f5f9;
      margin-bottom: 0.75rem;
      line-height: 1.3;
    }

    .card p {
      font-size: 1.2rem;
      color: #cbd5e1;
      line-height: 1.5;
    }

    .tag {
      display: inline-block;
      margin-top: 1rem;
      padding: 0.25rem 0.6rem;
      font-size: 0.75rem;
      font-weight: 600;
      border-radius: 6px;
      align-self: flex-start;
    }

    .tag-warning {
      background: #451a03;
      color: #fb923c;
    }

    .tag-process {
      background: #172554;
      color: #60a5fa;
    }

    .tag-success {
      background: #064e3b;
      color: #34d399;
    }


    #reference {
      align-self: flex-start;
      /* 左寄せのまま下端へ */
      margin-top: auto;
      /* 自動で下へ押し出す */
      color: #38bdf8;
      font-weight: bold;
      text-decoration: none;
    }

    #reference:hover {
      text-decoration: underline;
      color: #0ea5e9;
    }



    /* ###########フッター部分############# */
    footer {
      display: flex;
      /* 横並び配置 */
      justify-content: center;
      /* 中央寄せ */
      align-items: center;
      /* 縦方向中央寄せ */
      width: 80%;
      /* 全体幅を80%に制限 */
      min-width: 600px;
      /* ミニマムサイズ確保 */
      margin: 0 auto;
      /* 中央寄せ */
      gap: 2rem;
      /* カラムとテキストの間隔 */
      border-top: 1px solid #1e293b;
      padding-top: 0.8rem;
    }

    .card-footer {
      background: #1e293b;
      border: 1px solid #334155;
      border-radius: 12px;
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.2s, border-color 0.2s;
      width: 80%;
    }

    .flex-columns {
      display: flex;
      flex: 1;
      gap: 1rem;
      /* カラム間の余白 */
      justify-content: center;
      /* 横方向中央寄せ */
      align-items: center;
      /* 縦方向中央寄せ */
    }

    .flex-columns .column {
      flex: 1;
      /* 均等幅 */
      display: flex;
      /* 縦横中央寄せ用 */
      flex-direction: column;
      /* 縦方向に積む */
      justify-content: center;
      /* 縦方向中央寄せ */
      align-items: center;
      /* 横方向中央寄せ */
      text-align: center;
      background: #1e293b;
      /* 参考CSSに合わせた背景色 */
      border: 1px solid #334155;
      border-radius: 8px;
      padding: 0.75rem;
      color: #f8fafc;
      transition: transform 0.3s ease, border-color 0.3s ease;
    }

    .column-number {
      font-size: 2.5rem;
      font-weight: 600;
      color: #38bdf8;
      opacity: 0.8;
      margin-bottom: 0.5rem;
    }

    .column-text {
      font-size: 1.8rem;
      color: #f1f5f9;
      margin-bottom: 0.5rem;
    }

    .flex-columns .column:hover {
      transform: translateY(-4px) scale(1.05);
      border-color: #38bdf8;
    }

    footer span {
      flex-shrink: 0;
      /* 常に横並びで右側に表示 */
      align-self: center;
      /* 縦方向中央寄せ */
      font-weight: bold;
      color: #38bdf8;
    }

    /* ###########フッター部分############# */