<style>
    body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      background-color: #f9f9f9;
    }
    header {
      background-color: white;
      padding: 10px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: white;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
      width: 100%;
      position: fixed;
      top: 0;
      z-index: 1000;
    }
    header h1 {
      margin: 0;
      font-size: 24px;
      font-weight: bold;
      display: flex;
      align-items: center;
    }
    header h1 img {
      width: 90px;
      height: 40px;
      margin-right: 10px;
    }
    .search-bar {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 100%;
    }
    .search-bar input {
      width: 50%;
      height: 27px;
      padding: 10px;
      border: 0.1px solid rgb(179, 179, 179);
      border-right: none;
      border-radius: 15px 0 0 15px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
      font-size: 16px;
    }
    .search-bar button {
      padding: 10px;
      background-color: white;
      border: 0.1px solid rgb(179, 179, 179);
      border-radius: 0 15px 15px 0;
      cursor: pointer;
      transition: background-color 0.2s ease;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
    }
    .search-bar button svg {
      fill: #000;
    }
    .container {
      display: flex;
      width: 100%;
      margin-top: 60px;
    }
    .sidebar {
      width: 240px;
      background-color: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
      height: calc(100vh - 70px);
      position: fixed;
      top: 70px;
      left: 0;
      padding-top: 20px;
      padding-left: 10px;
      z-index: 999;
    }
    .sidebar a {
      display: block;
      padding: 10px 20px;
      text-decoration: none;
      color: #333;
      margin-bottom: 10px;
      transition: background-color 0.2s ease;
    }
    .sidebar a:hover {
      background-color: #f0f0f0;
    }
    .videos {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      margin-top: 10px;
      margin-left: 260px;
      width: calc(100% - 260px);
    }
    .video {
      width: 320px;
      margin: 15px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
      border-radius: 5px;
      overflow: hidden;
      background-color: white;
      transition: box-shadow 0.2s ease;
    }
    .video:hover {
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .video iframe {
      width: 100%;
      height: 180px;
      border: none;
      border-radius: 5px 5px 0 0;
    }
    .video h3 {
      margin: 10px;
      font-size: 18px;
      font-weight: bold;
      color: #333;
    }
    .video p {
      margin: 0 10px 10px;
      font-size: 14px;
      color: gray;
    }
    @media (max-width: 768px) {
      .sidebar {
        width: 200px;
        padding-left: 5px;
      }
      .videos {
        margin-left: 220px;
        width: calc(100% - 220px);
      }
      .search-bar input {
        width: 70%;
      }
    }
    @media (max-width: 480px) {
      header {
        flex-direction: column;
        align-items: flex-start;
      }
      .search-bar {
        width: 100%;
        margin-top: 10px;
      }
      .search-bar input {
        width: 100%;
      }
      .sidebar {
        display: none;
      }
      .videos {
        margin-left: 0;
        width: 100%;
      }
      .video {
        width: 100%;
        margin: 10px 0;
      }
    }
  </style>