.container {
      max-width: 100%;
      margin: 0 auto;
      background: #fff;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }  
    .section { margin-bottom: 20px; }
    label { display: block; margin-bottom: 5px; font-weight: 600; }
    input[type="file"], select, input[type="range"], input[type="text"], input[type="color"] {
      width: 100%;
      padding: 6px 8px;
      margin-bottom: 10px;
      border: 1px solid #ddd;
      border-radius: 4px;
    }
    input[type="range"] { margin-top: 4px; }
    button {
      padding: 8px 16px;
      margin: 4px 4px 4px 0;
      background: #007bff;
      color: white;
      border: none;
      border-radius: 4px;
      cursor: pointer;
    }
    button:hover { background: #0069d9; }
    button.reset { background: #6c757d; }
    button.reset:hover { background: #5a6268; }
    #preview {
      max-width: 400px;
      width: 100%;
      height: auto;
      border: 1px solid #eee;
      background: #fafafa;
      display: block;
      margin: 10px 0;
    }
    .toggle-group {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
    }
    .toggle-btn {
      flex: 1;
      padding: 8px;
      background: #e9ecef;
      border: 1px solid #ddd;
      text-align: center;
      cursor: pointer;
      border-radius: 4px;
    }
    .toggle-btn.active {
      background: #007bff;
      color: white;
      border-color: #007bff;
    }
    .hidden { display: none !important; }
    .controls-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }
    @media (max-width: 600px) {
      .controls-grid { grid-template-columns: 1fr; }
    }