body {
      margin: 0;
      height: 100vh;
      display: flex;
      font-family: Arial, sans-serif;
      background: #f5f5f5;
    }

    /* Left panel */
    .controls {
      flex: 1;
      background: #ffffff;
      padding: 20px;
      box-shadow: 2px 0 10px rgba(0,0,0,0.1);
      display: flex;
      flex-direction: column;
      gap: 15px;
    }
    .controls h2 {
      margin-top: 0;
      font-size: 20px;
    }
    .controls label {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 14px;
    }
    .controls input {
      width: 150px;
    }

    /* Right panel */
    .output {
        margin: auto;
      flex: 2;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 20px;
      padding: 20px;
    }
    .preview {
      width: 250px;
      height: 250px;
      background: white;
      border-radius: 15px;
      transition: 0.2s ease;
    }
    .code {
      background: #222;
      color: #0f0;
      padding: 15px;
      border-radius: 8px;
      font-family: monospace;
      width: 80%;
      max-width: 600px;
      min-height: 60px;
      max-height: 200px;   /* limit height */
      overflow-y: auto;    /* scroll if too long */
      white-space: pre-wrap; /* wrap text */
      word-wrap: break-word; /* break long words */
      text-align: left;
    }
    .copy-btn {
      margin-top: 5px;
      padding: 6px 12px;
      background: #0f0;
      border: none;
      cursor: pointer;
      border-radius: 5px;
      font-weight: bold;
    }