body {
      margin: 0;
      font-family: 'Segoe UI', sans-serif;
      background: #0f1117;
      color: #f0f0f0;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100vh;
      padding: 40px 20px;
    }

    h1 {
      margin-bottom: 20px;
      font-weight: 600;
      color: #ffffff;
    }

    select {
      padding: 10px 15px;
      font-size: 16px;
      background: #1f2330;
      color: #f0f0f0;
      border: 1px solid #333;
      border-radius: 8px;
      margin-bottom: 20px;
      cursor: pointer;
      transition: background 0.3s ease;
    }

    select:hover {
      background: #2c313f;
    }

    video {
      max-width: 100%;
      width: 800px;
      border-radius: 12px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    }

    footer {
      margin-top: 40px;
      font-size: 14px;
      color: #777;
    }

    @media (max-width: 850px) {
      video {
        width: 100%;
      }
    }