body {
    font-family: 'Segoe UI', sans-serif;
    background: radial-gradient(circle at center, #1a1a1a, #000);
    color: #fff;
    text-align: center;
    padding: 40px;
  }

  h1 { margin-bottom: 30px; }

  .section {
    margin: 30px auto;
    background: rgba(255,255,255,0.1);
    padding: 25px;
    border-radius: 10px;
    width: 380px;
  }

  label {
    display: block;
    font-size: 1.1em;
    margin: 8px 0 5px;
  }

  input, select {
    width: 90%;
    padding: 10px;
    font-size: 1em;
    border-radius: 6px;
    border: none;
    margin-bottom: 10px;
  }

  .output {
    margin-top: 10px;
    font-size: 1.1em;
    color: #00ffcc;
    word-wrap: break-word;
  }

  h2 { margin-top: 10px; }

  .copyBtn {
    margin-top: 6px;
    padding: 5px 10px;
    font-size: 0.9em;
    background: #4CAF50;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    color: white;
    transition: background 0.3s;
  }

  .copyBtn:hover {
    background: #45a049;
  }

  .copyBtn:active {
    transform: scale(0.97);
  }

  .copied {
    color: #66ff99;
    font-size: 0.9em;
    margin-top: 4px;
  }