body {
      font-family: sans-serif;
      margin: 0;
      padding: 0 10px;
    }

    .hidden {
      display: none;
    }

    table {
      border-collapse: collapse;
      margin-top: 10px;
    }

    th, td {
      border: 1px solid #ccc;
      padding: 6px 10px;
      text-align: center;
    }

    .mode-button.active {
      background-color: #007BFF;
      color: white;
    }

    .mode-buttons {
      margin-bottom: 10px;
    }

    .input-section {
      margin: 10px 0;
    }

    /* ===== ハンバーガーメニュー ===== */
    .hamburger {
      position: fixed;
      top: 10px;
      right: 15px;
      cursor: pointer;
      z-index: 1000;
    }

    .hamburger div {
      width: 25px;
      height: 3px;
      background-color: #333;
      margin: 5px 0;
      transition: 0.4s;
    }

    .menu {
      position: fixed;
      top: 0;
      right: 0;
      background-color: white;
      box-shadow: -2px 0 5px rgba(0, 0, 0, 0.2);
      width: 200px;
      height: 100%;
      transform: translateX(100%);
      transition: transform 0.3s ease-in-out;
      z-index: 999;
    }

    .menu.active {
      transform: translateX(0);
    }

    .menu ul {
      list-style: none;
      padding: 20px;
      margin: 0;
    }

    .menu ul li {
      margin-bottom: 20px;
    }

    .menu ul li a {
      text-decoration: none;
      color: #333;
      font-weight: bold;
    }