<style>
  /* 全体背景 */
  .solutions-section {
    padding: 80px 1rem;
    background-color: #f5f5f5;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  }
  .wrap1000 {
    max-width: 1000px;
    margin: 0 auto;
  }
  .area_ttl {
    text-align: center;
    margin-bottom: 3rem;
  }
  .area_ttl h2 {
    margin: 0;
    font-size: 2.5rem;
    color: #333333;
    letter-spacing: 0.05em;
  }
  .area_ttl p {
    margin: 0.5rem 0 0;
    font-size: 1rem;
    color: #666666;
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }

  /* グリッド */
  .solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  @media (max-width: 768px) {
    .solutions-grid { grid-template-columns: 1fr; }
  }

  /* カード */
  .solution-group {
    display: flex;
    flex-direction: column;
    border-radius: 12px;
    overflow: hidden;
    background-color: #ffffff;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
  }
  .solution-group:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
  }

  /* 大項目リンク */
  .solution-header h3 {
    margin: 0;
  }
  .solution-header h3 a {
    display: block;
    padding: 1.5rem;
    color: #ffffff;
    text-decoration: none;
    font-size: 1.5rem;
    border-radius: 12px 12px 0 0;
    transition: opacity 0.3s;
  }
  .solution-header h3 a:hover {
    opacity: 0.9;
  }

  /* サブ項目：文字色黒／ホバー背景のみ */
  .sub-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    background-color: #f5f5f5;
  }
  .sub-item a {
    display: block;
    padding: 1rem 1.25rem;
    background-color: #ffffff;
    color: #333333 !important;
    text-align: left;
    border-left: 4px solid currentColor;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: background-color 0.3s, transform 0.2s;
  }
  .sub-item a:hover {
    background-color: #eaeaea;
    color: #333333 !important;
    transform: translateX(4px);
  }
</style>