html, body {
    margin: 0;
    padding: 0;
    background-color: #2f2f2f; 
}

/* 全体コンテナ */
.video-container {
    background: #2f2f2f;
    color: #fff;
    width: 1400px;
    max-width: 100%;
    overflow: hidden;
    margin: 0 auto;
    padding: 0 20px;
}
  
  /* タイトルバー */
  .video-header{
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  }
  
  h3 {
    font-size: 1.3rem
}
  
  .video-header img.video-icon {
    width: 50px;
    height: 50px;
    vertical-align: middle;
    padding-right: 5px;
  }
  
  /* 動画部分 */
  .video {
    position: relative;
    width: 100%;
    margin: 0 auto;
  }
  
  .study-video {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: none;
    display: block; 
  }
  
  /* 情報欄 */
  .video-info {
    padding: 15px;
    width: 100%;
    margin: 0 auto;
    font-size: clamp(0.5rem, 1.5vw, 1.5rem);
    position: relative;
  }

  .video-info p{
      margin: 0;
  }
  
  .video-info .note {
    position: absolute;
    right: 30px;
    bottom: 50px;
    font-size: clamp(0.4rem, 1.2vw, 1.3rem);
  }
  
/* --- スマホ対応 --- */

@media (max-width: 768px) {
    .video-container {
        padding: 0 20px; 
    }

    .video-info .note {
        bottom: 25px;
    }

    h3 {
        font-size: 1rem;
    }

    .video-header img.video-icon {
        width: 40px;
        height: auto;
        padding-right: 3px;
    }
}