.app{height:100vh;display:flex;flex-direction:column;background-color:#1a1a1a;color:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app-header{padding:20px;background-color:#2d2d2d;border-bottom:1px solid #404040;text-align:center}.app-header h1{margin:0 0 8px;font-size:2rem;color:#6b9bd6}.app-header p{margin:0;color:#ccc;font-size:.9rem}.app-main{flex:1;display:flex;overflow:hidden}.left-panel{width:350px;background-color:#262626;border-right:1px solid #404040;display:flex;flex-direction:column;padding:20px;gap:20px;overflow-y:auto}.right-panel{flex:1;background-color:#1a1a1a;display:flex;align-items:center;justify-content:center}.panel-section{background-color:#333;border-radius:8px;padding:16px;border:1px solid #404040}.panel-section h3{margin:0 0 12px;font-size:1.1rem;color:#6b9bd6}.file-upload-area{border:2px dashed #666;border-radius:8px;padding:30px;text-align:center;cursor:pointer;transition:all .3s ease}.file-upload-area:hover{border-color:#6b9bd6;background-color:#6b9bd61a}.file-upload-area.has-file{border-color:#6b9bd6;background-color:#6b9bd633}.dimension-controls{display:flex;flex-direction:column;gap:12px}.dimension-input{display:flex;align-items:center;gap:8px}.dimension-input label{width:20px;font-weight:700;color:#6b9bd6}.dimension-input input{flex:1;padding:8px;border:1px solid #555;border-radius:4px;background-color:#2d2d2d;color:#fff}.dimension-input span{color:#ccc;font-size:.9rem}.process-button{width:100%;padding:12px;border:none;border-radius:6px;background-color:#5a8bc4;color:#fff;font-size:1rem;font-weight:700;cursor:pointer;transition:background-color .3s ease}.process-button:hover:not(:disabled){background-color:#4a7ab3}.process-button:disabled{background-color:#666;cursor:not-allowed}.progress-bar{width:100%;height:8px;background-color:#333;border-radius:4px;overflow:hidden;margin:8px 0}.progress-fill{height:100%;background-color:#5a8bc4;transition:width .3s ease}.status-text{font-size:.9rem;color:#ccc;text-align:center}.preview-container{width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:#666}.select-button{background-color:#555;color:#fff;border:none;padding:8px 12px;border-radius:4px;cursor:pointer;font-size:.9rem;margin-top:8px}.select-button:hover{background-color:#666}