:root {
      --primary-color: #191970;
      --accent-color: #007BFF;
      --accent-gradient: linear-gradient(135deg, #FD6585 10%, #0D25B9 100%);
      --text-light: #ffffff;
      --text-dark: #333333;
      --bg-light: #f4f4f4;
      --header-height: 130px;
    }

    body {
      font-family: Arial, 'Noto Sans JP', sans-serif;
      margin: 0;
      padding: 0;
      background-color: var(--bg-light);
      color: var(--text-dark);
      text-align: center;
      line-height: 1.6;
    }

    header {
      background-color: var(--primary-color);
      color: var(--text-light);
      padding: 10px 0;
      text-align: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      height: var(--header-height);
    }

    .header-container {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
      position: relative;
    }

    .header-logo {
      width: 90px;
      height: auto;
      margin: 0;
      padding: 0;
    }

    .header-logo:hover {
      transform: scale(1.1);
    }

    .title-block {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      position: relative;
    }

    h1 {
      font-family: 'Dancing Script', cursive;
      font-size: 3.5rem;
      margin: 0;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    }

    .header-subtitle {
      font-size: 0.9rem;
      font-weight: 300;
      line-height: 1.1;
      margin-top: 2px;
      margin-bottom: 0;
    }

    .nav-container {
      position: absolute;
      top: 65px;
      right: 20px;
    }

    .nav-container a,
    .nav-container button {
      color: var(--text-light);
      margin: 0 10px;
      text-decoration: none;
      font-weight: bold;
      background: none;
      border: none;
      cursor: pointer;
      transition: color 0.3s ease;
    }

    .nav-container a:hover,
    .nav-container button:hover {
      color: var(--accent-color);
    }

    .main-content {
      padding-top: calc(var(--header-height) + 20px);
    }

    .logo-container {
      margin: 3px auto;
      max-width: 1000px;
      padding: 10px;
      text-align: center;
    }

    .logo-container img {
      max-width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease;
    }

    .logo-container img:hover {
      transform: scale(1.2);
    }

    .container {
      max-width: 800px;
      margin: 20px auto;
      background: white;
      padding: 30px;
      box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
      border-radius: 15px;
    }

    .button {
      display: inline-block;
      padding: 12px 25px;
      margin: 10px 5px;
      color: var(--text-light);
      background: var(--accent-color);
      text-decoration: none;
      border-radius: 50px;
      font-weight: 600;
      border: none;
      transition: all 0.3s ease;
      box-shadow: 0 4px 6px rgba(13, 37, 185, 0.2);
    }

    .button:hover {
      background: var(--primary-color);
      transform: translateY(-2px);
      box-shadow: 0 6px 8px rgba(13, 37, 185, 0.3);
      color: var(--text-light);
    }

   .popup {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 2rem;
  border-radius: 10px;
  z-index: 1100;
  max-width: 90vw;
  max-height: 90vh;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.popup img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
}

.popup-close {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: #333;
  cursor: pointer;
  z-index: 1200;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1000;
}

   

    .popup button {
      position: absolute;
      top: 10px;
      right: 10px;
      font-size: 18px;
      background: none;
      border: none;
      color: #333;
      cursor: pointer;
    }

        footer {
            background-color: var(--primary-color);
            color: var(--text-light);
            padding: 20px 0;
            font-size: 16px;
            text-align: center;
            margin-top: 40px;
        }
        
        #passwordSection {
            margin: 30px 0;
            padding: 20px;
            background-color: rgba(25, 25, 112, 0.05);
            border-radius: 10px;
        }
        
        input {
            padding: 12px 15px;
            margin: 10px 0;
            width: 80%;
            max-width: 300px;
            border: 2px solid #ddd;
            border-radius: 50px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        input:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(13, 37, 185, 0.1);
        }
        
        .error {
            color: #e74c3c;
            display: none;
            margin-top: 10px;
            font-weight: 500;
        }
        
        .info-section {
            margin: 30px 0;
            padding: 15px;
            border-radius: 10px;
        }
        
        .section-icon {
            font-size: 2rem;
            margin-bottom: 10px;
            color: var(--accent-color);
        }
        
        .divider {
            height: 3px;
            background-image: var(--accent-gradient);
            border: none;
            border-radius: 3px;
            margin: 30px 10%;
        }
        
        /* レスポンシブ対応 */

    @media (max-width: 768px) {
      h1 {
        font-size: 2.2rem;
      }
      .header-subtitle {
        font-size: 0.8rem;
      }
    }

    @media (max-width: 480px) {
      :root {
        --header-height: 100px;
      }
    }
	
/* リストアイテムのカスタム */
        .custom-list-group-item {
            width: 80%; /* 幅の調整 */
            margin: 0 auto; /* 中央揃え */
            height: 60px; /* 高さの調整 */
            display: flex; /* 中央揃え用 */
            align-items: center; /* 縦方向の中央揃え */
            background-color: #f0f0f0; /* デフォルト背景色 */
            border: 1px solid #ddd; /* 枠線のスタイル */
        }
        .custom-list-group-item:hover {
            background-color: #d0d0ff;
            cursor: pointer;
        }