/* General Style */
body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
    text-align: center;
  }

  .container {
    max-width: 500px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    animation: fadeIn 1.2s ease-in-out;
  }

  h1 {
    font-size: 2.2rem;
    margin-bottom: 15px;
    color: #1db954;
  }

  p {
    font-size: 1rem;
    margin-bottom: 25px;
    color: #ddd;
  }

  /* Button */
  .btn {
    background: linear-gradient(90deg, #1db954, #1ed760);
    color: #fff;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(29, 185, 84, 0.4);
  }

  .btn:hover {
    transform: scale(1.08);
    box-shadow: 0 8px 25px rgba(29, 185, 84, 0.6);
  }

  /* Animation */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }