.design-section {
    max-width: 1000px;
    margin: 100px auto;
    padding: 20px;
    font-family: 'Helvetica Neue', sans-serif;
    color: #333;
  }
  
  .design-section h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    border-bottom: 2px solid #ccc;
    padding-bottom: 10px;
  }
  
  .work-card {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
    background-color: rgba(255,255,255,0.9);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  }
  
  .work-image {
    max-width: 100%;
    width: 400px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }
  
  .work-info {
    max-width: 500px;
  }
  
  .work-info h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
  }
  
  .work-info p {
    font-size: 1rem;
    line-height: 1.6;
  }
  
  /* アニメーション（フェードイン） */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeIn 1.2s ease-out forwards;
  }
  
  @keyframes fadeIn {
    to {
      opacity: 1;
      transform: none;
    }
  }

  .sub-info {
    font-size: 0.9rem;
    color: #777; /* 薄いグレー */
    line-height: 1.5;
  }

  .back-fixed-button {
    position: fixed;
    bottom: 20px;
    left: 20px;
    padding: 10px 20px;
    background-color: #fc9db5;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: background-color 0.3s ease;
    z-index: 1000;
    text-decoration: none; /* ★ 下線を消す！ */
    display: inline-block;  /* ボタンの見た目を整えるために追加 */
  }
  
  .back-fixed-button:hover {
    background-color: #e5889f;
  }
  
  /* ===== 基本レイアウト ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Helvetica Neue', sans-serif;
    color: #333;
    background-color: #fff;
    padding: 20px;
  }
  
  .design-section {
    max-width: 1000px;
    margin: 100px auto;
    padding: 20px;
  }
  
  .design-section h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    border-bottom: 2px solid #ccc;
    padding-bottom: 10px;
  }
  
  .work-card {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
    align-items: flex-start;
    background-color: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  }
  
  .work-image {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }
  
  .work-info {
    max-width: 500px;
    flex: 1;
    min-width: 250px;
  }
  
  .work-info h2 {
    margin-bottom: 10px;
    font-size: 1.5rem;
  }
  
  .work-info p {
    font-size: 1rem;
    line-height: 1.6;
  }
  
  .sub-info {
    font-size: 0.9rem;
    color: #777;
    line-height: 1.5;
  }
  
  /* ===== 戻るボタン（固定位置） ===== */
  .back-fixed-button {
    position: fixed;
    bottom: 20px;
    left: 20px;
    padding: 10px 20px;
    background-color: #fc9db5;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: background-color 0.3s ease;
    z-index: 1000;
    text-decoration: none;
    display: inline-block;
  }
  
  .back-fixed-button:hover {
    background-color: #e5889f;
  }
  
  /* ===== フェードインアニメーション ===== */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeIn 1.2s ease-out forwards;
  }
  
  @keyframes fadeIn {
    to {
      opacity: 1;
      transform: none;
    }
  }
  
  /* ===== スマホ対応（レスポンシブ） ===== */
  @media screen and (max-width: 768px) {
    .work-card {
      flex-direction: column;
      align-items: center;
    }
  
    .work-image {
      width: 100%;
      max-width: 90%;
    }
  
    .work-info {
      text-align: center;
    }
  
    .back-fixed-button {
      display: none; /* スマホでは戻るボタン非表示 */
    }
  }