body {
    margin: 0;
    padding: 0;
    background-color: #f4f6f8;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #212529;
    overflow-x: hidden;
  }
  
  main {
    padding-top: 72px;
    padding-bottom: 16px;
    box-sizing: border-box;
  }
  
  .login-wrapper {
    max-width: 480px;
    margin: 0 auto;
    padding: 0 16px;
  }
  
  .card {
    background: #fff;
    border-radius: 16px;
    padding: 24px;
    margin-top: 40px;
    text-align: center;
  }
  
  input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
  }
  
  /* ✅ ログインボタンスタイル（緑塗り・白文字） */
  .login-button {
    display: block;
    margin: 16px auto 0 auto;
    width: 100%;
    max-width: 160px;
    height: 40px;
    font-size: 14px;
    font-weight: bold;
    border-radius: 9999px;
    border: none;
    background-color: #2ecc71;
    color: #ffffff;
    cursor: pointer;
    padding: 0;
    box-sizing: border-box;
  }
  
  .login-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #cccccc;
    color: #ffffff;
    border: none;
  }
  
  #msg {
    margin-top: 16px;
    font-size: 15px;
    color: red;
  }
  
  .note {
    font-size: 13px;
    color: #999;
    margin-top: 32px;
  }
  
  @media (max-width: 630px) {
    .card {
      padding: 16px;
    }
  
    input {
      font-size: 14px;
    }
  
    .login-button {
      max-width: 280px;
    }
  }