body {
    margin: 0;
    font-family: sans-serif;
    background: #ffffff;
  }
  
  /* ヘッダー */
  .site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 90px;
    padding: 0 2rem;
    background-color: #666666;
    color: white;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  /* ロゴ画像用 */
.logo-img {
    height: 30px;        /* ヘッダーに対してちょうど良い高さ */
    width: auto;
  max-width: 100%;
    object-fit: contain; /* 画像の比率を崩さず縮小 */
  }
  
  .register-button {
    background-color: #9bcdcd; 
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .register-button:hover {
    background-color: #32cdcd;
  }
  
  /* モーダル全体 */
.modal {
    position: fixed;
    z-index: 999;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    /* display: flex; */
    justify-content: center;
    align-items: center;
  
    padding: 1rem; /* モバイル用余白 */
    box-sizing: border-box;
  }
  
  /* モーダルの中身 */
  .modal-content {
    background-color: #fff;
  padding: 2rem;
  border-radius: 8px;
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  overflow-x: hidden; /* ← 横のはみ出し防止 */
  position: relative;
  box-sizing: border-box;
  }
  
  /* モバイル対応（念のため） */
@media (max-width: 600px) {
    .modal-content {
        padding: 1rem;
        font-size: 0.95rem;
        overflow-y: auto;
        overflow-x: hidden;  /* 念押しで横はみ出し防止 */
      }
    
      form input,
      form select {
        font-size: 1rem;
        padding: 0.4rem;
      }
    
      h2 {
        font-size: 1.2rem;
      }
  }

  .modal-content h2 {
    text-align: center;
    margin-bottom: 1rem;
  }
  
  /* 閉じるボタン */
  .close {
    position: absolute;
    top: 1rem;
    right: 1.2rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: #555;
  }
  
  form label {
    font-weight: bold;
    display: block;
    margin-top: 1rem;
  }
  
  form input,
  form select {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.3rem;
    border-radius: 4px;
    border: 1px solid #ccc;
    box-sizing: border-box; /* ← 忘れがち。これが重要！ */
  }
  
  form input[type="submit"] {
    margin-top: 1.5rem;
    background-color: #9bcdcd;
    color: white;
    border: none;
    padding: 0.75rem;
    font-size: 1rem;
    cursor: pointer;
  }
  
  form input[type="submit"]:hover {
    background-color: #32cdcd;
  }
  


  #song-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem;
  }
  
  .song-card {
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 8px;
    width: 300px;
    padding: 1rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  }
  
  .cover {
    width: 100%;
    height: auto;
    border-radius: 4px;
  }
  
  .song-card .info {
    margin-top: 0.5rem;
  }