body {
    margin: 0;
    height: 100vh;
    background: linear-gradient(135deg, #2c3849, #8b2331);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Poppins', sans-serif;
    color: #fff;
    overflow: hidden;
  }

  .container {
    position: relative;
    width: 350px;
    perspective: 1000px;
  }

  .box {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.05);
    border-radius: 20px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.6s ease;
  }

  .box.hidden {
    opacity: 0;
    pointer-events: none;
  }

  input[type="file"] {
    margin-bottom: 20px;
  }

  button {
    margin-top: 20px;
    padding: 10px 20px;
    background: #ffffff22;
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
  }

  button:hover {
    background: #ffffff44;
  }