:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:#e0e0e0;background-color:#1a1a1a;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-height:100vh}#root{max-width:1280px;margin:0 auto;padding:2rem}h1{color:#0f0;text-align:center;margin-bottom:2rem}.app-container{display:flex;flex-direction:column;gap:2rem}.upload-form{background:#2a2a2a;padding:1.5rem;border-radius:8px;border:1px solid #444}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.form-group input[type=file]{width:100%;padding:.75rem;background:#333;border:1px solid #555;border-radius:4px;color:inherit}.form-group input[type=file]::file-selector-button{padding:.5rem 1rem;margin-right:1rem;background:#444;border:1px solid #666;border-radius:4px;color:#e0e0e0;cursor:pointer}.form-group input[type=file]::file-selector-button:hover{background:#555}.options-group{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:1rem}.checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer}.checkbox-label input[type=checkbox]{width:18px;height:18px;cursor:pointer}.convert-button{padding:.75rem 2rem;background:#0a0;border:none;border-radius:4px;color:#fff;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s}.convert-button:hover{background:#0c0}.convert-button:disabled{background:#555;cursor:not-allowed}.preview-section{background:#000;border-radius:8px;overflow:hidden}.preview-header{background:#2a2a2a;padding:.75rem 1rem;border-bottom:1px solid #444;font-weight:500}.preview-content{padding:1rem}.help-text{color:#888;font-size:.875rem;text-align:center}.error-message{color:#f55;padding:1rem;background:#ff55551a;border-radius:4px;margin-top:1rem}