body {
      margin: 0;
      font-family: 'Segoe UI', sans-serif;
      background: #f5f7f6;
      color: #333;
    }

    .container {
      max-width: 1100px;
      margin: auto;
      padding: 20px;
    }

    .header {
      background: #8b9a7b;
      color: white;
      padding: 20px;
      border-radius: 12px;
      margin-bottom: 20px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    .header h1 {
      margin: 0;
      font-size: 24px;
    }

    .header p {
      margin: 5px 0 0;
      font-size: 14px;
      opacity: 0.9;
    }

    .card {
      background: white;
      border-radius: 12px;
      padding: 15px;
      box-shadow: 0 6px 15px rgba(0,0,0,0.08);
    }

    iframe {
      width: 100%;
      height: 80vh;
      border: none;
      border-radius: 8px;
    }

    .footer {
      text-align: center;
      font-size: 12px;
      margin-top: 15px;
      color: #888;
    }

    .btn {
      display: inline-block;
      margin-top: 10px;
      padding: 10px 16px;
      background: #8b9a7b;
      color: white;
      text-decoration: none;
      border-radius: 8px;
      font-size: 14px;
      transition: 0.2s;
    }

    .btn:hover {
      background: #768565;
    }